CN222938543U - Fluid flow metering device - Google Patents

Abstract

The utility model discloses a fluid flow metering device, which relates to the technical field of application of volumetric flow meters and comprises a volumetric flow meter and a shell, wherein a first chamber, a second chamber, a third chamber and a fourth chamber are arranged in the shell, the first chamber is used for containing fluid to be metered, the second chamber is used for containing replacement fluid, the third chamber is used for containing replacement fluid, the fourth chamber is used for containing fluid to be metered, a rotor of the volumetric flow meter is arranged between a first opening and a second opening, and the volumetric flow meter can meter the volume of the replacement fluid passing through the volumetric flow meter.

Description

Fluid flow metering device

Technical Field

The utility model relates to the technical field of application of positive displacement flowmeters, in particular to a fluid flow metering device.

Background

Volumetric flowmeters are devices that repeatedly meter the volume of fluid passing through the meter using a fixed small volume, and have a standard volume of space within the volumetric flowmeter, commonly referred to as the metering space or chamber of the volumetric flowmeter, which is formed by the inner wall of the meter housing and the rotating components of the meter.

The working principle of the volumetric flowmeter is that a certain pressure difference is generated between the inlet and the outlet of the flowmeter when fluid passes through the flowmeter, the rotor of the flowmeter rotates under the action of the pressure difference and discharges the fluid from the inlet to the outlet, the fluid continuously fills the metering space of the flowmeter and is continuously sent to the outlet by the rotor, and the rotor is usually designed to rotate for 1 circle and just sends out the fluid with the volume equal to 1 time of the volume of the metering space. Assuming that the fixed standard volume of the metering space is V, and the fixed standard volume of the fluid discharged through the flowmeter in a certain time interval is n (equal to the number of rotations of the rotor), the total volume Q of the fluid to be measured is q=nv. Currently, in practical applications and related experimental studies, it is found that when the flow rate of a liquid is directly measured using a volumetric flowmeter, there are the following problems:

1. The volumetric flowmeter is generally only suitable for liquid with certain viscosity, but cannot be suitable for accurately metering low-viscosity liquid (such as ultrapure water or some low-viscosity special solvents, etc.), particularly when the flow rate is very small, and cannot be metered at all;

2. volumetric flowmeters are generally suitable for direct metering of clean single-phase fluids only, and not for unclean and multiphase fluids;

3. If the positive displacement flowmeter is used for directly measuring harsh liquids such as strong alkali and strong acid, the harsh liquids (corrosiveness, inflammability, explosiveness, heat, coldness or the combination thereof) can easily interfere with or even destroy the internal structure of the positive displacement flowmeter, so that the selection of the types of the positive displacement flowmeter is limited.

Based on the above problems, when the volumetric flowmeter is used for directly measuring the flow rate of certain liquids, only one volumetric flowmeter can be specifically selected in a small range, and even no optional volumetric flowmeter is provided, which limits the application of the volumetric flowmeter in the flow rate measurement of the liquids.

Disclosure of utility model

The utility model aims to provide a fluid flow metering device, which solves the problems in the prior art, and when the volumetric flowmeter is applied to flow metering of liquid, the volumetric flowmeter is not limited by the physicochemical properties and the cleanliness of the liquid to be metered.

In order to achieve the above object, the present utility model provides the following solutions:

The utility model provides a fluid flow metering device which comprises a positive displacement flowmeter and a shell, wherein a first chamber, a second chamber, a third chamber and a fourth chamber are arranged in the shell, the first chamber is used for containing fluid to be metered, the volume of the first chamber can be changed, a first inlet and outlet port is formed in the first chamber, the second chamber is used for containing displacement fluid, the volume sum of the second chamber and the first chamber can be kept fixed, the second chamber is used for being communicated with a first opening of the positive displacement flowmeter, the volume of the third chamber can be changed, the volume sum of the third chamber and the second chamber can be kept fixed, the third chamber is used for being communicated with a second opening of the positive displacement flowmeter, the volume of the fourth chamber can be changed, the volume sum of the fourth chamber and the third chamber can be kept fixed, the volume sum of the fourth chamber and the fourth chamber can be kept fixed, and the fourth chamber can be placed in the positive displacement flowmeter through the first opening, and the fourth chamber can be placed in the positive displacement flowmeter.

Preferably, the device further comprises an inlet/outlet reversing valve, a first inlet/outlet channel and a second inlet/outlet channel are arranged in the shell, an inlet port and an outlet port are formed in the shell, a first end of the first inlet/outlet channel is connected and communicated with the first inlet/outlet port, a second end of the first inlet/outlet channel can be connected and communicated with the inlet port or the outlet port, a first end of the second inlet/outlet channel is connected and communicated with the second inlet/outlet port, a second end of the second inlet/outlet channel can be communicated with the inlet port or the outlet port, when the inlet/outlet reversing valve is in a first state, the second end of the first inlet/outlet channel can be communicated with the inlet port and the second end of the second inlet/outlet channel can be communicated with the outlet port, and when the inlet/outlet reversing valve rotates to a second state, the second end of the first inlet/outlet channel can be communicated with the outlet port and the second inlet/outlet port can be communicated with the second inlet port.

The housing comprises a rigid housing body, a first separator, a second separator, a third separator and a fourth separator, wherein the first separator and the fourth separator are rigid separators, the first separator and the fourth separator are fixedly arranged in the rigid housing body side by side so as to divide the interior of the rigid housing body into a first cavity, a mounting cavity and a second cavity in sequence, the second separator is arranged in the first cavity and divides the first cavity into the first cavity and the second cavity, the second separator can at least partially move towards the direction approaching or separating from the second cavity, the third separator is arranged in the second cavity and divides the second cavity into the third cavity and the fourth cavity, the third separator can at least partially move towards the direction approaching or separating from the first cavity, and the mounting cavity is used for accommodating the volumetric flowmeter.

Preferably, the second separator is a flexible member, edges of the second separator are all fixedly arranged on the inner wall of the first cavity, the third separator is a flexible member, and edges of the third separator are all fixedly arranged on the inner wall of the second cavity.

Preferably, the second separator is a high-density polyethylene flexible film, and the third separator is a high-density polyethylene flexible film.

Preferably, the device further comprises a driving device, wherein the driving device is in transmission connection with the in-out flow reversing valve, and the driving device can provide power for rotation of the in-out flow reversing valve.

Compared with the prior art, the utility model has the following technical effects:

The utility model provides a fluid flow metering device, which is characterized in that the volume of a first chamber, a second chamber, a third chamber and a fourth chamber can be changed, the second chamber is communicated with a first opening of a volumetric flowmeter, the third chamber is communicated with a second opening of the volumetric flowmeter, when the first chamber and the fourth chamber are filled with fluid to be metered and the second chamber and the third chamber are filled with displacement fluid, the fluid to be metered is filled into the first chamber through a first inlet and outlet port, the displacement fluid in the second chamber is forced to pass through the volumetric flowmeter and enter the third chamber, the volume of the third chamber is increased due to the increase of the displacement fluid, the volume of the fourth chamber is forced to be reduced, so that part of the fluid to be metered in the fourth chamber is separated from the second inlet and outlet port, wherein the volume sum of the second chamber and the first chamber can be kept fixed, the volume sum of the fourth chamber and the third chamber can be filled with displacement fluid, the displacement fluid is forced to pass through the second chamber and the fourth chamber to pass through the volumetric flowmeter, the displacement fluid can be displaced from the fourth chamber and the fourth chamber can be displaced from the volumetric flowmeter due to the volume of the fourth chamber and the volume of the fourth chamber is increased, the displacement fluid can be displaced from the fourth chamber and the fourth chamber can be equal to the volume of the displacement fluid in volume, and the displacement fluid can be displaced from the fourth chamber and the fourth chamber through the fourth chamber and the volumetric chamber can be displaced through the volume flow meter, the volume of the first chamber is forced to be reduced, so that part of the fluid to be measured in the first chamber leaves from the first inlet and outlet, the volume of the displacement fluid entering the second chamber from the third chamber through the volumetric flow meter is equal to the volume of the fluid to be measured in the first chamber from the first inlet and outlet, and meanwhile, the volume of the displacement fluid entering the second chamber from the third chamber through the volumetric flow meter can be measured by the volumetric flow meter, so that the fluid flow measuring device provided by the embodiment can indirectly finish the volume measurement of the fluid to be measured, and the volumetric flow meter can directly contact the displacement fluid (such as clean lubricating oil) which is suitable and convenient to measure the volume, thereby avoiding damage to the volumetric flow meter, such as corrosion, blockage and the like.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of the overall structure of a fluid flow metering device according to the present utility model;

In the figure, a fluid flow metering device, a 1-volumetric flowmeter, a 2-shell, a 21-first chamber, a 22-second chamber, a 23-third chamber, a 24-fourth chamber, a 3-inlet and outlet reversing valve, a 4-driving device, a 10-first separator, a 11-second separator, a 12-third separator and a 13-fourth separator are arranged.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model aims to provide a fluid flow metering device, which solves the problems in the prior art, and when the volumetric flowmeter is applied to flow metering of liquid, the volumetric flowmeter is not limited by the physicochemical properties and the cleanliness of the liquid to be metered.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

As shown in fig. 1, the present embodiment provides a fluid flow metering device 100, which includes a volumetric flowmeter 1 and a housing 2, wherein the housing 2 is provided with a first chamber 21, a second chamber 22, a third chamber 23 and a fourth chamber 24, the first chamber 21 is used for accommodating fluid to be metered, the volume of the first chamber 21 can be changed, a first inlet and outlet port is formed in the first chamber 21, the second chamber 22 is used for accommodating displacement fluid, the volume of the second chamber 22 can be changed, the sum of the volumes of the second chamber 22 and the first chamber 21 can be kept fixed, the second chamber 22 is used for communicating with a first opening of the volumetric flowmeter 1, the third chamber 23 is used for accommodating displacement fluid, the sum of the volumes of the third chamber 23 and the second chamber 22 can be kept fixed, the third chamber 23 is used for communicating with a second opening of the volumetric flowmeter 1, the volume of the fourth chamber 24 is used for accommodating fluid to be metered, the volume of the fourth chamber 24 can be changed, the sum of the fourth chamber 24 and the volume of the third chamber 23 can be kept fixed, the sum of the volumes of the fourth chamber 24 and the fourth chamber 22 can be communicated with the first opening of the volumetric flowmeter 1, the second chamber and the fourth chamber 24 can be placed between the volumetric flowmeter 1 and the first opening can be opened.

Thus, the fluid flow meter device 100 provided in this embodiment is suitable for fluid flow metering, and is more suitable for liquid flow metering, and is particularly suitable for liquid flow metering of some inconvenient metering, specifically, the displacement fluid (such as clean lubricating oil) of the volumetric flow meter 1 is in direct contact with the convenient metering volume, the volumes of the first chamber 21, the second chamber 22, the third chamber 23 and the fourth chamber 24 can be changed, the second chamber 22 is used for communicating with the first opening of the volumetric flow meter 1, the third chamber 23 is used for communicating with the second opening of the volumetric flow meter 1, and the first chamber 21 and the fourth chamber 24 are filled with the fluid to be metered, And under the condition that both the second chamber 22 and the third chamber 23 are full of the replacement fluid, the first chamber 21 is filled with the replacement fluid through the first inlet and outlet port, the replacement fluid in the second chamber 22 is forced to pass through the volumetric flowmeter 1 and enter the third chamber 23, the volume of the third chamber 23 is increased due to the increase of the replacement fluid, the volume of the fourth chamber 24 is forced to decrease, so that part of the replacement fluid in the fourth chamber 24 leaves from the second inlet and outlet port, wherein, as the sum of the volumes of the second chamber 22 and the first chamber 21 can be kept fixed, the sum of the volumes of the second chamber 22 and the third chamber 23 can be kept fixed, the sum of the volumes of the fourth chamber 24 and the third chamber 23 can be kept fixed, the volume of the replacement fluid entering the third chamber 23 from the second chamber 22 through the volumetric flowmeter 1 is equal to the volume of the replacement fluid leaving the fourth chamber 24 from the second inlet and outlet port, and the volume of the replacement fluid entering the third chamber 23 from the second chamber 22 through the volumetric flowmeter 1 can be discharged from the second inlet and outlet port, and the volume of the replacement fluid can be filled with the volumetric flowmeter 1, and the replacement fluid can be filled with the replacement fluid in the first chamber 21 and the fourth chamber 24 can be filled with the replacement fluid, And under the condition that the second chamber 22 and the third chamber 23 are full of the replacement fluid, the replacement fluid in the third chamber 23 is forced to pass through the volumetric flowmeter 1 and enter the second chamber 22 by filling the replacement fluid into the fourth chamber 24 through the second inlet and outlet port, the volume of the second chamber 22 is increased due to the increase of the replacement fluid, the volume of the first chamber 21 is forced to be reduced, so that part of the replacement fluid in the first chamber 21 leaves from the first inlet and outlet port, the volume of the replacement fluid entering the second chamber 22 from the third chamber 23 through the volumetric flowmeter 1 is equal to the volume of the replacement fluid leaving the first chamber 21 from the first inlet and outlet port, and at the same time, the volume of the replacement fluid entering the second chamber 22 from the third chamber 23 through the volumetric flowmeter 1 can be metered by the volumetric flowmeter 1, so that the fluid flow metering device 100 provided by the embodiment can indirectly complete the metering of the volume of the fluid to be metered, and due to the fact that the volume of the volumetric flowmeter 1 is in direct contact, The displacement fluid (such as clean lubricating oil) of the volume of being convenient for measurement is not only convenient for measurement, but also can avoid damage such as corrosion and blockage to the volumetric flowmeter 1, so that when the volume measurement is carried out on the fluid to be measured with low viscosity, severity, small flow or other inconveniences and even the volume can not be directly measured by the volumetric flowmeter 1, the fluid flow measuring device 100 provided by the embodiment is not limited by the physicochemical property and the cleanliness degree of the fluid to be measured any more, the specific selectable range of the volumetric flowmeter 1 can be enlarged, the application of the volumetric flowmeter 1 to the liquid volume measurement can be promoted, and the measuring cost can be saved.

Further, the fluid flow metering device 100 provided in this embodiment further includes an inlet-outlet reversing valve 3, the housing has a first inlet-outlet channel and a second inlet-outlet channel, the housing is provided with an inlet-outlet port and an outlet-outlet port, the inlet-outlet port is used for being connected with a fluid supply pipe to be metered, so that fluid to be metered enters the fluid flow metering device 100 provided in this embodiment through the inlet-outlet port, the outlet-outlet port is used for being connected with a fluid discharge pipe to be metered, so that fluid to be metered is discharged to the outside of the fluid flow metering device 100 provided in this embodiment through the outlet-outlet port, a first end of the first inlet-outlet channel is connected and communicated with the first inlet-outlet port, a second end of the first inlet-outlet channel is capable of being connected and communicated with the inlet-outlet port, and a second end of the second inlet-outlet channel is capable of being communicated with the inlet-outlet port or the outlet port, when the fluid to be metered enters the fluid flow metering device 100 provided in this embodiment through the inlet-outlet port, the outlet port is capable of being connected with the inlet-outlet port, and the second end of the second inlet-outlet channel is capable of being rotated to be communicated with the inlet-outlet port when the second inlet-outlet port is in a first state, and the second inlet-outlet port is capable of being rotated, so that the second inlet-outlet port is capable of being communicated with the second inlet port.

Further, the housing 2 includes a rigid housing 2 body, a first separator 10, a second separator 11, a third separator 12 and a fourth separator 13, the first separator 10 and the fourth separator 13 are both rigid separators, the first separator 10 and the fourth separator 13 are fixedly disposed in the rigid housing 2 body side by side to divide the interior of the rigid housing 2 body into a first cavity, a mounting cavity and a second cavity in sequence, the second separator 11 is disposed in the first cavity and divides the first cavity into the first cavity 21 and the second cavity 22, the second separator 11 can move at least partially in a direction approaching or separating from the second cavity, in this embodiment, the second separator 11 can move in a direction approaching or separating from the first separator 10, the third separator 12 is disposed in the second cavity and divides the second cavity into the third cavity 23 and the fourth cavity 24, and at least a portion of the third separator 12 can move in a direction approaching or separating from the first cavity, in this embodiment, the third separator 12 can move in a direction approaching or separating from the first cavity 10, and the mounting cavity is easy to manufacture the flowmeter 1, and the volume is easy to accommodate.

In an alternative scheme of this embodiment, the second separator 11 may be a flexible member, edges of the second separator 11 are all fixedly disposed on an inner wall of the first cavity, and the third separator 12 may be a flexible member, edges of the third separator 12 are all fixedly disposed on an inner wall of the second cavity, so that in a metering process, it is ensured that in a moving deformation process of the second separator 11 and the third separator 12 in a direction approaching to and separating from the first separator 10, a moving deformation amount should not exceed a bearing limit of a material.

Further, the second separator 11 may be a high-density polyethylene flexible film, and the third separator 12 may be a high-density polyethylene flexible film, which is excellent in aging resistance, acid and alkali resistance, and flexibility.

Further, the fluid flow metering device 100 provided in this embodiment further includes a driving device 4, where the driving device 4 is in transmission connection with the in-out flow reversing valve 3, and the driving device 4 can provide power for rotation of the in-out flow reversing valve 3, so that the use is convenient.

The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided herein to facilitate understanding of the principles and embodiments of the present utility model and to provide further advantages and practical applications for those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.

Claims (6)

1. A fluid flow metering device is characterized by comprising a positive displacement flowmeter and a shell, wherein a first chamber, a second chamber, a third chamber and a fourth chamber are arranged in the shell, the first chamber is used for containing fluid to be metered, the volume of the first chamber can be changed, a first inlet and outlet port is formed in the first chamber, the second chamber is used for containing displacement fluid, the volume sum of the second chamber and the first chamber can be kept fixed, the second chamber is used for being communicated with a first opening of the positive displacement flowmeter, the volume of the third chamber can be changed, the volume sum of the third chamber and the second chamber can be kept fixed, the third chamber is used for being communicated with a second opening of the positive displacement flowmeter, the volume of the fourth chamber can be changed, the volume of the fourth chamber and the third chamber can be kept fixed, the volume sum of the fourth chamber and the fourth chamber can be kept fixed, and the fourth chamber can be placed between the positive displacement flowmeter and the first inlet and outlet port and the fourth chamber can be placed on the positive displacement flowmeter.

2. The fluid flow metering device of claim 1 further comprising an inlet-outlet reversing valve, wherein the housing is provided with a first inlet-outlet channel and a second inlet-outlet channel, the housing is provided with an inlet-outlet port and an outlet-outlet port, a first end of the first inlet-outlet channel is connected and communicated with the first inlet-outlet port, a second end of the first inlet-outlet channel is connected and communicated with the inlet-outlet port or the outlet-outlet port, a second end of the second inlet-outlet channel is connected and communicated with the inlet-outlet port or the outlet-outlet port, the inlet-outlet reversing valve is in a first state, the second end of the first inlet-outlet channel is communicated with the inlet-outlet port, and the second end of the second inlet-outlet channel is communicated with the outlet-outlet port, and the inlet-outlet reversing valve is rotated to a second state, the second end of the first inlet-outlet channel is communicated with the inlet-outlet port, and the second inlet-outlet port is communicated with the inlet-outlet port.

3. The fluid flow meter according to claim 2, wherein the housing comprises a rigid housing body, a first separator, a second separator, a third separator and a fourth separator, wherein the first separator and the fourth separator are rigid separators, the first separator and the fourth separator are fixedly arranged in the rigid housing body side by side so as to divide the interior of the rigid housing body into a first cavity, a mounting cavity and a second cavity in sequence, the second separator is arranged in the first cavity and divides the first cavity into the first cavity and the second cavity, the second separator is at least partially movable in a direction approaching or separating from the second cavity, the third separator is arranged in the second cavity and divides the second cavity into the third cavity and the fourth cavity, the third separator is at least partially movable in a direction approaching or separating from the first cavity, and the mounting cavity is used for accommodating the volume flow meter.

4. The fluid flow metering device of claim 3 wherein the second separator is a flexible member, edges of the second separator are fixedly disposed on the inner wall of the first cavity, and edges of the third separator are fixedly disposed on the inner wall of the second cavity.

5. The fluid flow metering device of claim 4 wherein the second separator is a high density polyethylene flexible membrane and the third separator is a high density polyethylene flexible membrane.

6. The fluid flow metering device of claim 2 further comprising a drive device in driving communication with said flow reversing valve, said drive device being capable of powering rotation of said flow reversing valve.