Fluid flow metering device
By designing a multi-chamber structure and an inlet and outlet flow reversing valve in the fluid flow metering device, the contact between the volumetric flow meter and suitable replacement fluid is achieved, and the problems of low viscosity, unclean and harsh liquid metering in the prior art are solved, which expands the application range and reduces costs.
Patent Information
- Application Number
- CN202422032757.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-21
AI Technical Summary
Existing volume flow meters have problems of inaccurate metering or structural damage when metering low viscosity liquids, unclean fluids and harsh liquids, which limits their application scope.
A fluid flow metering device is designed, by setting multiple chambers in the housing and using inlet and outlet flow reversing valves and driving devices to realize alternating flow of the fluid to be metered and the displaced fluid, so that the volumetric flow meter is directly in contact with the appropriate displaced fluid for metering.
This device can effectively avoid corrosion and blockage of the volumetric flowmeter by the fluid to be metered, expand the application range of the volumetric flowmeter, realize accurate flow metering of low viscosity, unclean and harsh liquids, and reduce metering costs.
Smart Images
Figure CN222938543U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of application of positive displacement flowmeters, in particular to a fluid flow metering device. Background Art
[0002] A positive displacement flowmeter uses a fixed small volume to repeatedly measure the volume of fluid passing through the flowmeter. Inside the positive displacement flowmeter, there is a space with a standard volume, which is usually called the metering space or metering chamber of the positive displacement flowmeter. The metering space is formed by the inner wall of the instrument housing and the rotating components of the flowmeter.
[0003] The working principle of the positive displacement flowmeter is as follows: When the fluid passes through the flowmeter, a certain pressure difference will be generated between the inlet and outlet of the flowmeter. The rotor of the flowmeter rotates under the action of this pressure difference, and the fluid is discharged from the inlet to the outlet. The fluid continuously fills the metering space of the flowmeter and is then continuously sent to the outlet by the rotor. Usually, it is designed that when the rotor rotates one circle, exactly the volume of fluid equal to one times the volume of the metering space is sent out. Suppose the fixed standard volume of the metering space is V, and the fixed standard volume number of the fluid discharged through the flowmeter within a certain time interval is n (equal to the number of rotations of the rotor), then the total volume Q of the measured fluid is Q = nV. Currently, in actual practical applications and related experimental studies, it is found that when directly measuring the flow rate of liquids using a positive displacement flowmeter, the following problems exist:
[0004] 1. Direct measurement by a positive displacement flowmeter is usually only applicable to liquids with a certain viscosity and cannot be used for accurate measurement of low-viscosity liquids (such as ultrapure water or some low-viscosity special solvents, etc.), especially when the flow rate is very small, it cannot be measured at all;
[0005] 2. Direct measurement by a positive displacement flowmeter is usually only applicable to clean single-phase fluids and cannot be used for unclean and multiphase fluids;
[0006] 3. If a positive displacement flowmeter is used to directly measure harsh liquids such as strong alkalis and strong acids, the harsh liquids (corrosive, flammable, explosive, hot, cold, or having these comprehensive characteristics) will easily interfere with or even damage the internal structure of the positive displacement flowmeter, restricting the selection of the type of positive displacement flowmeter.
[0007] Based on the above problems, when directly measuring the flow rate of certain liquids using a positive displacement flowmeter, only a certain type of positive displacement flowmeter can be specifically selected within a small range, or even there is no selectable positive displacement flowmeter at all, which restricts the application of the positive displacement flowmeter in the flow rate measurement of liquids. Summary of the Utility Model
[0008] The purpose of the present utility model is to provide a fluid flow metering device to solve the problems existing in the above-mentioned prior art, so that when a positive displacement flowmeter is applied to the flow metering of liquids, it is no longer restricted by the physical and chemical properties and cleanliness of the liquid to be metered.
[0009] To achieve the above object, the present utility model provides the following solutions:
[0010] The present utility model provides a fluid flow metering device, including a positive displacement flowmeter and a housing. The housing has a first chamber, a second chamber, a third chamber and a fourth chamber. The first chamber is used to accommodate the fluid to be metered, the volume of the first chamber can be changed, and a first inlet / outlet is provided on the first chamber. The second chamber is used to accommodate the displacement fluid, the volume of the second chamber can be changed, the total volume of the second chamber and the first chamber can be kept fixed, and the second chamber is used to communicate with the first opening of the positive displacement flowmeter. The third chamber is used to accommodate the displacement fluid, the volume of the third chamber can be changed, the total volume of the third chamber and the second chamber can be kept fixed, and the third chamber is used to communicate with the second opening of the positive displacement flowmeter. The fourth chamber is used to accommodate the fluid to be metered, the volume of the fourth chamber can be changed, the total volume of the fourth chamber and the third chamber can be kept fixed, and a second inlet / outlet is provided on the fourth chamber. The rotor of the positive displacement flowmeter is placed between the first opening and the second opening, and the positive displacement flowmeter can measure the volume of the displacement fluid passing through the positive displacement flowmeter.
[0011] Preferably, it further includes an inlet / outlet flow reversing valve. The housing has a first inlet / outlet channel and a second inlet / outlet channel. An inlet interface and an outlet interface are provided on the housing. The first end of the first inlet / outlet channel is connected and communicated with the first inlet / outlet, and the second end of the first inlet / outlet channel can be communicated with the inlet interface or the outlet interface. The first end of the second inlet / outlet channel is connected and communicated with the second inlet / outlet, and the second end of the second inlet / outlet channel can be communicated with the inlet interface or the outlet interface. When the inlet / outlet flow reversing valve is in the first state, it can make the second end of the first inlet / outlet channel communicate with the inlet interface and make the second end of the second inlet / outlet channel communicate with the outlet interface. When the inlet / outlet flow reversing valve rotates to the second state, it can make the second end of the first inlet / outlet channel communicate with the outlet interface and make the second end of the second inlet / outlet channel communicate with the inlet interface.
[0012] Preferably, the housing includes a rigid housing body, a first partition, a second partition, a third partition, and a fourth partition; the first partition and the fourth partition are both rigid partitions, and the first partition and the fourth partition are fixedly arranged side by side in the rigid housing body to sequentially divide the interior of the rigid housing body into a first cavity, an installation cavity, and a second cavity; the second partition is arranged in the first cavity and divides the first cavity into the first chamber and the second chamber, and at least part of the second partition can move in a direction close to or away from the second cavity; the third partition is arranged in the second cavity and divides the second cavity into the third chamber and the fourth chamber, and at least part of the third partition can move in a direction close to or away from the first cavity; the installation cavity is used to accommodate the positive displacement flowmeter.
[0013] Preferably, the second partition is a flexible member, and the edges of the second partition are fixedly arranged on the inner wall of the first cavity; the third partition is a flexible member, and the edges of the third partition are fixedly arranged on the inner wall of the second cavity.
[0014] Preferably, the second partition is a high-density polyethylene flexible film, and the third partition is a high-density polyethylene flexible film.
[0015] Preferably, a driving device is further included, and the driving device is in transmission connection with the inlet and outlet flow direction reversing valve, and the driving device can provide power for the rotation of the inlet and outlet flow direction reversing valve.
[0016] The utility model has achieved the following technical effects compared with the prior art:
[0017] The fluid flow metering device provided by the present utility model can change the volumes of the first chamber, the second chamber, the third chamber and the fourth chamber. The second chamber is used to communicate with the first opening of the positive displacement flowmeter, and the third chamber is used to communicate with the second opening of the positive displacement flowmeter. When the first chamber and the fourth chamber are both filled with the fluid to be metered, and the second chamber and the third chamber are both filled with the displacement fluid, the fluid to be metered is filled into the first chamber through the first inlet / outlet, forcing the displacement fluid in the second chamber to pass through the positive displacement flowmeter and enter the third chamber. The volume of the third chamber increases due to the increase of the displacement fluid, forcing the volume of the fourth chamber to decrease, so that part of the fluid to be metered in the fourth chamber leaves through the second inlet / outlet. Among them, since the total volume of the second chamber and the first chamber can be kept fixed, the total volume of the second chamber and the third chamber can be kept fixed, and the total volume of the fourth chamber and the third chamber can be kept fixed, the volume of the displacement fluid passing from the second chamber through the positive displacement flowmeter into the third chamber is equal to the volume of the fluid to be metered leaving the fourth chamber through the second inlet / outlet. At the same time, the volume of the displacement fluid passing from the second chamber through the positive displacement flowmeter into the third chamber can be measured by the positive displacement flowmeter. Similarly, when the first chamber and the fourth chamber are both filled with the fluid to be metered, and the second chamber and the third chamber are both filled with the displacement fluid, the fluid to be metered is filled into the fourth chamber through the second inlet / outlet, forcing the displacement fluid in the third chamber to pass through the positive displacement flowmeter and enter the second chamber. The volume of the second chamber increases due to the increase of the displacement fluid, forcing the volume of the first chamber to decrease, so that part of the fluid to be metered in the first chamber leaves through the first inlet / outlet. The volume of the displacement fluid passing from the third chamber through the positive displacement flowmeter into the second chamber is equal to the volume of the fluid to be metered leaving the first chamber through the first inlet / outlet. At the same time, the volume of the displacement fluid passing from the third chamber through the positive displacement flowmeter into the second chamber can be measured by the positive displacement flowmeter. Therefore, the fluid flow metering device provided by this embodiment can indirectly complete the metering of the volume of the fluid to be metered. Since the positive displacement flowmeter is directly in contact with a suitable displacement fluid (such as clean lubricating oil) that is convenient for volume measurement, it is not only convenient for metering, but also can avoid damage such as corrosion and blockage to the positive displacement flowmeter. Therefore, when measuring the volume of a fluid to be metered with low viscosity, harshness, small flow rate or other inconvenient or even impossible to directly measure the volume by a positive displacement flowmeter, using the fluid flow metering device provided by this embodiment is no longer restricted by the physical and chemical properties and cleanliness of the fluid to be metered, can expand the specific selectable range of the positive displacement flowmeter, promote the application of the positive displacement flowmeter in liquid volume measurement, and can also save the metering cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0019] Figure 1 It is a schematic diagram of the overall structure of the fluid flow metering device provided by the present invention;
[0020] In the figure: 100 - fluid flow metering device, 1 - positive displacement flowmeter, 2 - housing, 21 - first chamber, 22 - second chamber, 23 - third chamber, 24 - fourth chamber, 3 - inlet and outlet flow reversing valve, 4 - driving device, 10 - first partition, 11 - second partition, 12 - third partition, 13 - fourth partition. Detailed implementation manners
[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0022] The purpose of the present invention is to provide a fluid flow metering device to solve the problems existing in the above-mentioned prior art, so that when the positive displacement flowmeter is applied to the flow metering of liquids, it is no longer restricted by the physical and chemical properties and cleanliness of the liquid to be metered.
[0023] To make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.
[0024] Such as Figure 1As shown in the figure, this embodiment provides a fluid flow metering device 100, which includes a positive displacement flowmeter 1 and a housing 2. The housing 2 has a first chamber 21, a second chamber 22, a third chamber 23, and a fourth chamber 24. The first chamber 21 is used to accommodate the fluid to be metered. The volume of the first chamber 21 can be changed, and a first inlet / outlet port is provided on the first chamber 21. The second chamber 22 is used to accommodate the 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, and the second chamber 22 is used to communicate with the first opening of the positive displacement flowmeter 1. The third chamber 23 is used to accommodate the displacement fluid. The volume of the third chamber 23 can be changed. The sum of the volumes of the third chamber 23 and the second chamber 22 can be kept fixed, and the third chamber 23 is used to communicate with the second opening of the positive displacement flowmeter 1. The fourth chamber 24 is used to accommodate the fluid to be metered. The volume of the fourth chamber 24 can be changed. The sum of the volumes of the fourth chamber 24 and the third chamber 23 can be kept fixed, and a second inlet / outlet port is provided on the fourth chamber 24. The rotor of the positive displacement flowmeter 1 is placed between the first opening and the second opening, and the positive displacement flowmeter 1 can measure the volume of the displacement fluid passing through the positive displacement flowmeter 1.
[0025] Therefore, the fluid flow metering device 100 provided in this embodiment is applicable to the flow metering of fluids, and more particularly to the flow metering of liquids, especially those that are not easily metered. Specifically, the displacement fluid directly contacted by the positive displacement flowmeter 1 is a suitable fluid for which the volume is easily metered (such as clean lubricating oil). The volumes of the first chamber 21, the second chamber 22, the third chamber 23, and the fourth chamber 24 can all be changed. The second chamber 22 is used to communicate with the first opening of the positive displacement flowmeter 1, and the third chamber 23 is used to communicate with the second opening of the positive displacement flowmeter 1. When the first chamber 21 and the fourth chamber 24 are both filled with the fluid to be metered, and the second chamber 22 and the third chamber 23 are both filled with the displacement fluid, the fluid to be metered is filled into the first chamber 21 through the first inlet / outlet, forcing the displacement fluid in the second chamber 22 to pass through the positive displacement flowmeter 1 and enter the third chamber 23. The volume of the third chamber 23 increases due to the increase in the displacement fluid, forcing the volume of the fourth chamber 24 to decrease. As a result, a part of the fluid to be metered in the fourth chamber 24 leaves through the second inlet / outlet. Among them, since the total volume of the second chamber 22 and the first chamber 21 can be kept fixed, the total volume of the second chamber 22 and the third chamber 23 can be kept fixed, and the total volume of the fourth chamber 24 and the third chamber 23 can be kept fixed, the volume of the displacement fluid passing from the second chamber 22 through the positive displacement flowmeter 1 into the third chamber 23 is equal to the volume of the fluid to be metered leaving the fourth chamber 24 through the second inlet / outlet. At the same time, the volume of the displacement fluid passing from the second chamber 22 through the positive displacement flowmeter 1 into the third chamber 23 can be metered by the positive displacement flowmeter 1;Similarly, when the first chamber 21 and the fourth chamber 24 are both filled with the fluid to be metered, and the second chamber 22 and the third chamber 23 are both filled with the displacement fluid, the fluid to be metered is filled into the fourth chamber 24 through the second inlet / outlet port, forcing the displacement fluid in the third chamber 23 to pass through the positive displacement flowmeter 1 and enter the second chamber 22. The volume of the second chamber 22 increases due to the increase in the displacement fluid, forcing the volume of the first chamber 21 to decrease. As a result, a part of the fluid to be metered in the first chamber 21 leaves through the first inlet / outlet port. The volume of the displacement fluid that enters the second chamber 22 from the third chamber 23 through the positive displacement flowmeter 1 is equal to the volume of the fluid to be metered that leaves the first chamber 21 through the first inlet / outlet port. At the same time, the volume of the displacement fluid that enters the second chamber 22 from the third chamber 23 through the positive displacement flowmeter 1 can be measured by the positive displacement flowmeter 1. Therefore, the fluid flow metering device 100 provided in this embodiment can indirectly complete the metering of the volume of the fluid to be metered. Since the positive displacement flowmeter 1 is directly in contact with a suitable displacement fluid (such as clean lubricating oil) that is convenient for volume metering, it is not only convenient for metering but also can avoid damage such as corrosion and blockage to the positive displacement flowmeter 1. Therefore, when metering the volume of a fluid to be metered with low viscosity, harshness, small flow rate, or other inconvenient or even impossible to directly measure the volume through the positive displacement flowmeter 1, using the fluid flow metering device 100 provided in this embodiment is no longer restricted by the physical and chemical properties and cleanliness of the fluid to be metered, can expand the specific selectable range of the positive displacement flowmeter 1, promote the application of the positive displacement flowmeter 1 in liquid volume metering, and can also save metering costs.
[0026] Furthermore, the fluid flow metering device 100 provided in this embodiment further includes an inlet / outlet flow direction reversing valve 3. The housing has a first inlet / outlet flow channel and a second inlet / outlet flow channel. The housing is provided with an inlet interface and an outlet interface. The inlet interface is used to connect to the fluid supply pipeline to be metered, so that the fluid to be metered enters the fluid flow metering device 100 provided in this embodiment through the inlet interface. The outlet interface is used to connect to the fluid discharge pipeline to be metered, so that the fluid to be metered is discharged to the outside of the fluid flow metering device 100 provided in this embodiment through the outlet interface. The first end of the first inlet / outlet flow channel is connected and communicated with the first inlet / outlet port, and the second end of the first inlet / outlet flow channel can be connected and communicated with the inlet interface or the outlet interface. The first end of the second inlet / outlet flow channel is connected and communicated with the second inlet / outlet port, and the second end of the second inlet / outlet flow channel can be connected and communicated with the inlet interface or the outlet interface. When the inlet / outlet flow direction reversing valve 3 is in the first state, it can make the second end of the first inlet / outlet flow channel communicate with the inlet interface and make the second end of the second inlet / outlet flow channel communicate with the outlet interface. When the inlet / outlet flow direction reversing valve 3 rotates to the second state, it can make the second end of the first inlet / outlet flow channel communicate with the outlet interface and make the second end of the second inlet / outlet flow channel communicate with the inlet interface, which is convenient to use.
[0027] Further, the housing 2 includes a rigid housing 2 body, a first partition 10, a second partition 11, a third partition 12, and a fourth partition 13. Both the first partition 10 and the fourth partition 13 are rigid partitions. The first partition 10 and the fourth partition 13 are fixedly arranged side by side inside the rigid housing 2 body to sequentially divide the interior of the rigid housing 2 body into a first cavity, an installation cavity, and a second cavity. The second partition 11 is arranged in the first cavity and divides the first cavity into a first chamber 21 and a second chamber 22. At least part of the second partition 11 can move in a direction close to or away from the second cavity. In this embodiment, the second partition 11 can move in a direction close to or away from the first partition 10. The third partition 12 is arranged in the second cavity and divides the second cavity into a third chamber 23 and a fourth chamber 24. At least part of the third partition 12 can move in a direction close to or away from the first cavity. In this embodiment, the third partition 12 can move in a direction close to or away from the first partition 10. The installation cavity is used to accommodate the positive displacement flowmeter 1, with a simple structure, being easy to manufacture and saving costs.
[0028] In an alternative solution of this embodiment, the second partition 11 can be a flexible member, and the edges of the second partition 11 are fixedly arranged on the inner wall of the first cavity. The third partition 12 can be a flexible member, and the edges of the third partition 12 are fixedly arranged on the inner wall of the second cavity. During the metering process, it should be ensured that during the process of the second partition 11 and the third partition 12 moving and deforming in directions close to and away from the first partition 10, the amount of movement and deformation should not exceed the bearing limit of the material.
[0029] Further, the second partition 11 can be a high-density polyethylene flexible film, and the third partition 12 can be a high-density polyethylene flexible film, which has good anti-aging property, acid and alkali resistance, and flexibility.
[0030] Further, the fluid flow metering device 100 provided in this embodiment further includes a driving device 4. The driving device 4 is in transmission connection with the inlet and outlet flow reversing valve 3, and the driving device 4 can provide power for the rotation of the inlet and outlet flow reversing valve 3, which is convenient for use.
[0031] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. At the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.
Claims
1. A fluid flow metering device, characterized in that: The invention comprises a volumetric flow meter and a housing, wherein the housing has a first chamber, a second chamber, a third chamber and a fourth chamber; the first chamber is used to accommodate a fluid to be measured, the volume of the first chamber can be changed, and a first inlet and outlet are provided on the first chamber; the second chamber is used to accommodate a displacement fluid, the volume of the second chamber can be changed, the sum of the volumes of the second chamber and the first chamber can be kept fixed, and the second chamber is used to communicate with the first opening of the volumetric flow meter; the third chamber is used to accommodate the displacement fluid, the volume of the third chamber The volume of the third chamber can be changed, the total volume of the third chamber and the second chamber can be kept fixed, and the third chamber is used to communicate with the second opening of the volumetric flowmeter; the fourth chamber is used to accommodate the fluid to be measured, the volume of the fourth chamber can be changed, the total volume of the fourth chamber and the third chamber can be kept fixed, and the fourth chamber is provided with a second inlet and outlet; the rotor of the volumetric flowmeter is placed between the first opening and the second opening, and the volumetric flowmeter can measure the volume of the displacement fluid passing through the volumetric flowmeter.
2. The fluid flow metering device according to claim 1, characterized in that: It also includes an inlet and outlet flow reversing valve, wherein the shell has a first inlet and outlet flow channel and a second inlet and outlet flow channel, and the shell is provided with an inlet interface and an outlet interface, the first end of the first inlet and outlet flow channel is connected and communicated with the first inlet and outlet flow port, the second end of the first inlet and outlet flow channel can be communicated with the inlet interface or the outlet flow port, the first end of the second inlet and outlet flow channel is connected and communicated with the second inlet and outlet flow port, and the second end of the second inlet and outlet flow channel can be communicated with the inlet interface or the outlet flow port; when the inlet and outlet flow reversing valve is in a first state, the second end of the first inlet and outlet flow channel can be communicated with the inlet interface, and the second end of the second inlet and outlet flow channel can be communicated with the outlet interface; when the inlet and outlet flow reversing valve is rotated to a second state, the second end of the first inlet and outlet flow channel can be communicated with the outlet interface, and the second end of the second inlet and outlet flow channel can be communicated with the inlet interface.
3. The fluid flow metering device according to claim 2, characterized in that: The shell includes a rigid shell body, a first separator, a second separator, a third separator and a fourth separator; the first separator and the fourth separator are both rigid separators, and the first separator and the fourth separator are fixed side by side in the rigid shell body to divide the interior of the rigid shell body into a first cavity, an installation cavity and a second cavity in sequence; the second separator is arranged in the first cavity and divides the first cavity into the first chamber and the second chamber, and the second separator is at least partially capable of moving toward or away from the second cavity; the third separator is arranged in the second cavity and divides the second cavity into the third chamber and the fourth chamber, and the third separator is at least partially capable of moving toward or away from the first cavity; the installation cavity is used to accommodate the volumetric flowmeter.
4. The fluid flow metering device according to claim 3, characterized in that: The second separator is a flexible member, and the edges of the second separator are fixed on the inner wall of the first cavity; the third separator is a flexible member, and the edges of the third separator are fixed on the inner wall of the second cavity.
5. The fluid flow metering device according to claim 4, characterized in that: The second separator is a high-density polyethylene flexible film, and the third separator is a high-density polyethylene flexible film.
6. The fluid flow metering device according to claim 2, characterized in that: It also includes a driving device, which is drivingly connected to the inlet and outlet flow reversing valve, and can provide power for the inlet and outlet flow reversing valve to rotate.