CN216645472U

CN216645472U - Volume-adjusting end cover assembly for positive displacement flowmeter

Info

Publication number: CN216645472U
Application number: CN202123384173.2U
Authority: CN
Inventors: 吕二红; 衡迎新; 张胜龙
Original assignee: Luoyang Sanao New Material Technology Co ltd
Current assignee: Luoyang Sanao New Material Technology Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-05-31
Anticipated expiration: 2031-12-29

Abstract

The utility model discloses a volume-adjusting end cover assembly for a volumetric flowmeter, which comprises an end cover arranged on a volumetric flowmeter shell, wherein a plurality of bolt holes are uniformly distributed on the periphery of the end cover; the center of the end cover is provided with a threaded through hole, a quantity adjusting screw rod is inserted into the threaded through hole, and the threaded through hole is communicated with a metering cavity of the volumetric flowmeter and used for adjusting the volume of the metering cavity when the quantity adjusting screw rod stretches out and draws back in the threaded through hole through rotation. According to the utility model, the volume of the metering cavity is increased, the range is increased and the measurement precision is ensured by the shrinkage of the adjusting screw rod in the threaded through hole and the cavities of the rest threaded through holes.

Description

Volume-adjusting end cover assembly for positive displacement flowmeter

Technical Field

The utility model belongs to the technical field of volumetric flowmeters, and particularly relates to a volume-adjusting end cover assembly for a volumetric flowmeter.

Background

A positive displacement flow meter is a meter that integrates flow directly according to the volume of the fluid being discharged. The moving parts of the volumetric flowmeter have two types of reciprocating motion and rotary motion. The working principle of the rotary positive displacement flowmeter is as follows: when fluid passes through the flowmeter, a certain pressure difference is generated between the inlet and the outlet of the flowmeter. The rotating part of the flowmeter (called rotor for short) rotates under the action of the pressure difference and discharges the fluid from the inlet to the outlet. In this process, the fluid fills the "metering volume" of the meter one time at a time and is then continuously sent to the outlet. The volume of the metering space is determined for a given flow meter condition, and a cumulative value of the volume of fluid passing through the flow meter is obtained as long as the number of revolutions of the rotor is measured.

Usually the "metering space" of a volumetric flow meter is fixed, i.e. the metering cavity for measuring the fluid is fixed; however, the problem of such a fixed volume is that the maximum measurement range corresponding to the flow meter is also a fixed value, and the measurement range of the flow meter may be exceeded for the working condition with large flow change; secondly, when the flow rate is large, even if the rotation speed of the rotor of the flow meter is increased, although the discharge capacity can be increased, the rotor rotating too fast generates internal leakage, and the measurement accuracy is reduced.

Disclosure of Invention

In order to overcome the defects in the background art, the utility model provides a volume-adjusting end cover assembly for a volumetric flowmeter, and aims to provide a volume-adjusting mechanism on an end cover of the volumetric flowmeter, so that a volume-adjustable chamber on the end cover is adjusted, and the measurement volume of the volumetric flowmeter is increased or reduced, thereby adapting to the working condition with larger flow change; in addition, through adjusting the metering volume, the displacement can be improved under the condition that the rotating speed of the rotor is not changed, thereby avoiding the reduction of the measurement precision.

In order to achieve the purpose, the utility model provides the following technical scheme:

a volume-adjusting end cover assembly for a volumetric flowmeter comprises an end cover arranged on a volumetric flowmeter shell, wherein a plurality of bolt holes are uniformly distributed on the periphery of the end cover; the center of the end cover is provided with a threaded through hole, the threaded through hole is inserted with a quantity adjusting screw rod, and the threaded through hole is communicated with a metering cavity of the volumetric flowmeter and used for adjusting the volume of the metering cavity when the quantity adjusting screw rod stretches out and draws back in the threaded through hole through rotation.

As further optimization, one end of the threaded through hole close to the inner side of the end cover is a screw hole part, one end close to the outer side of the end cover is a smooth hole part, one end of the quantity adjusting screw rod is a screw rod part, the middle part of the quantity adjusting screw rod is a smooth rod part, and the other end of the quantity adjusting screw rod is a screwing head; the polished rod part corresponds to the unthreaded hole part, the screw rod part corresponds to the screw hole part, a groove is arranged on the polished rod part, a sealing ring is sleeved in the groove, and the outer side of the sealing ring abuts against the inner wall of the lower unthreaded hole part and is used for sealing the threaded through hole.

As a further optimization, there are two grooves, and the number of corresponding seals is also two, for constituting a double seal.

As a further optimization, a handle disc is fixedly connected to the screwing head and used for screwing the quantity adjusting screw rod.

As further optimization, a plurality of through pin holes are uniformly distributed on the circumference of the handle disc, and a positioning bolt is inserted into the pin hole at the uppermost end; and a first thread jack is arranged at the upper part of the outer side of the end cover, corresponds to the pin hole in position, and is used for screwing the tail end of the positioning bolt in the thread jack to fix the position of the adjusting screw rod.

Preferably, the outer lower part of the end cover is provided with a second threaded insertion hole, and the second threaded insertion hole is used for enabling a positioning bolt to penetrate through a pin hole at the lowest end of the handle disc and to be screwed in the second threaded insertion hole.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, the volume of the metering cavity is increased by the shrinkage of the metering screw rod in the threaded through hole and the cavities of the rest threaded through holes, so that the metering volume is increased to adapt to the working condition with larger flow, the over-fast rotation of the rotor is avoided, and the measuring precision is ensured. In addition, the positioning bolts are matched with the uniformly distributed pin holes, so that the volume measuring function after fixed adjustment is achieved, the adjustable volume variable can be predicted and measured, and the reasonable adjustment can be conveniently carried out corresponding to different flow rates.

Drawings

Fig. 1 is a schematic three-dimensional structure of embodiment 1 of the present invention;

FIG. 2 is a schematic cross-sectional view of embodiment 1 of the present invention;

fig. 3 is a schematic sectional view of the adjusting screw according to embodiment 1 of the present invention.

In the figure: 1 end cover, 11 bolt holes, 12 threaded through holes, 121 threaded hole parts, 122 smooth hole parts, 13 first threaded insertion holes, 14 second threaded insertion holes, 2 adjusting screw rods, 21 screw rod parts, 22 smooth rod parts, 23 screwing heads, 24 grooves, 3 sealing rings, 4 handle discs, 41 pin holes and 5 positioning bolts.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings of the present invention, and it is obvious that the described embodiments are only a part of the preferred embodiments of the present invention, and not all embodiments. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Example 1: please refer to fig. 1-3;

the utility model provides the following technical scheme: a volume-adjusting end cover assembly for a volumetric flowmeter comprises an end cover 1 arranged on a volumetric flowmeter shell, wherein 4 bolt holes 11 for installation are distributed at four corners of the periphery of the end cover;

the center of the end cover 1 is provided with a threaded through hole 12, the threaded through hole 12 is inserted and connected with the quantity adjusting screw rod 2, and the threaded through hole 12 is communicated with a metering cavity of the volumetric flowmeter and used for adjusting the volume of the metering cavity of the volumetric flowmeter when the quantity adjusting screw rod 2 stretches and retracts in the threaded through hole 12 through rotation; the upper part and the lower part of the outer side of the end cover 1 are provided with a first thread insertion hole 13 and a second thread insertion hole 14 which are vertically symmetrical by taking the axis of the thread through hole 12 as a center.

One end of the threaded through hole 12 close to the inner side of the end cover 1 is a threaded hole portion 121, and one end close to the outer side of the end cover 1 is a smooth hole portion 122.

One end of the quantity adjusting screw rod 2 is a screw rod part 21, the middle part thereof is a polished rod part 22, and the other end thereof is a twisting head 23; a handle disc 4 is welded and sleeved on the screwing head 23, a plurality of through pin holes 41 are uniformly distributed on the circumference of the handle disc 4, and a positioning bolt 5 is inserted into the pin hole 41 at the uppermost end; the threaded insertion hole 13 corresponds to the uppermost pin hole 41 in position, and is used for screwing the tail end of the positioning bolt 5 in the first threaded insertion hole 13 to fix the position of the adjusting screw rod 2; the second threaded socket 14 provides a second chance of correspondence to the pin holes 41 on the rotatable handle disc 4, thereby improving the accuracy of adjustment of the handle disc 4.

The position of the light rod part 22 corresponds to that of the light hole part 122, and the position of the screw rod part 21 corresponds to that of the screw hole part 121; two grooves 24 are arranged on the polish rod part 22, a sealing ring 3 is sleeved in each groove 24, and the outer side of each sealing ring 3 is abutted against the inner wall of the polish rod hole part 122 and is used for sealing the threaded through hole 12; although the threaded connection already has a sealing function, the two additional sealing rings 3 provide double sealing, so that the sealing effect is better.

When the metering device is used, the positioning bolt 5 is firstly drawn out, the handle disc 4 is rotated for a certain angle until the pin hole 41 corresponds to the threaded insertion hole 13, the distance between the initial position and the rotated pin hole 41 is observed, so that the rotating angle of the handle disc 4 is obtained, the telescopic position of the metering screw rod 2 in the threaded through hole 12 is obtained through corresponding calculation, and the variable volume of the metering cavity of the volumetric flowmeter is obtained, so that the metering volume discharged each time changes when the rotor rotates, the measuring range is changed, and different flow sizes are adapted.

It should be noted that, in the present embodiment, the measurement range is changed by adjusting the measurement volume, which only belongs to the fine adjustment of the measurement range, and the working principle of the flowmeter itself is not changed, and the measurement accuracy thereof is not affected.

The embodiment has the advantages that compared with the prior art:

through adjusting the volume screw rod 2 and contracting in screw thread through-hole 12, remaining screw thread through-hole 12's cavity has increased the volume of measurement cavity to increased the measurement volume, with the great operating mode of adaptation flow, avoided the too fast rotation of rotor, ensured measurement accuracy. In addition, the positioning bolts 5 are matched with the uniformly distributed pin holes 41, so that the volume metering function after fixed adjustment is achieved, the adjusted volume variable can be predicted and measured, and the reasonable adjustment corresponding to different flow rates is facilitated.

The utility model is not described in detail in the prior art; for a person skilled in the art, various technical features of the embodiments described above may be combined arbitrarily, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, however, as long as there is no contradiction between the combinations of the technical features, the combinations should be considered as the scope of the present description. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A volume-adjusting end cover assembly for a volumetric flowmeter comprises an end cover (1) arranged on a volumetric flowmeter shell, wherein a plurality of bolt holes (11) used for connecting the shell are uniformly distributed on the periphery of the end cover (1); the method is characterized in that:

a threaded through hole (12) is formed in the center of the end cover (1), and a quantity adjusting screw rod (2) is connected in the threaded through hole (12) in a threaded mode; the threaded through hole (12) is communicated with a metering cavity of the volumetric flowmeter and used for adjusting the volume of the metering cavity when the metering screw (2) stretches in the threaded through hole (12) through rotation.

2. The volumetric flow meter metering end cap assembly of claim 1, wherein: the threaded through hole (12) is divided into two parts, one end of the threaded through hole close to the inner side of the end cover (1) is a threaded hole part (121), and one end of the threaded through hole close to the outer side of the end cover (1) is a smooth hole part (122); one end of the quantity adjusting screw rod (2) is a screw rod part (21), the middle of the quantity adjusting screw rod is a polished rod part (22), and the other end of the quantity adjusting screw rod is a twisting head (23); the position of the polished rod part (22) corresponds to that of the polished hole part (122), and the position of the screw rod part (21) corresponds to that of the screw hole part (121); a groove (24) is formed in the polished rod part (22), and a sealing ring (3) used for sealing the threaded through hole (12) is sleeved in the groove (24).

3. The volumetric flow meter metering end cap assembly of claim 2, wherein: the number of the grooves (24) is two, and the number of the corresponding sealing rings (3) is also two.

4. A volume adjusting end cap assembly for a positive displacement flow meter according to claim 3, wherein: and the screwing head (23) is fixedly connected with a handle disc (4), and the handle disc (4) is used for screwing the volume-adjusting screw rod (2).

5. The volumetric flow meter metering end cap assembly of claim 4, wherein: a plurality of through pin holes (41) are uniformly distributed on the circumference of the handle disc (4), wherein a positioning bolt (5) is inserted into the pin hole (41) at the uppermost end; the outer side upper portion of end cover (1) is equipped with first screw thread jack (13), first screw thread jack (13) with the position of pinhole (41) of the top corresponds, be used for through the end of positioning bolt (5) is screwed in first screw thread jack (13), fixed adjust the position of volume screw rod (2).

6. The volumetric flow meter metering end cap assembly of claim 5, wherein: and a second threaded insertion hole (14) is formed in the lower portion of the outer side of the end cover (1), and the second threaded insertion hole (14) is used for enabling a positioning bolt (5) to penetrate through a pin hole (41) in the lowest end of the handle disc (4) and to be screwed in the second threaded insertion hole (14).