Mass flow meter and fluid dispensing device

Abstract

The utility model relates to a mass flow meter and a fluid distribution device. The mass flow meter comprises: a base; the present invention relates to a flow meter comprising a base, a plurality of flow tubes disposed on the base, each flow tube of the plurality of flow tubes being configured for flowing through an independent fluid flow and equipped with a respective driver and detector for independently measuring the mass flow of the fluid flow flowing through the respective flow tube. The mass flow meter can simultaneously and independently measure the mass flow of a plurality of fluid flows, and is low in manufacturing cost, compact in structure and convenient to install.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metering equipment. In particular, the present application relates to a mass flow meter and a fluid distribution device. BACKGROUND

[0002] This section provides background information which is not necessarily prior art.

[0003] At present, volumetric flow meters are still used in some industries to measure the flow of fluid due to cost reasons. For example, volumetric flow meters are commonly used in fuel dispensers at gas stations to measure the flow of fluid for metering and charging. The volumetric flow meter measures the volumetric flow of fluid, and the measurement result is easily affected by factors such as temperature change and pressure change of the fluid, thereby resulting in low measurement accuracy. Therefore, in some industries, there is an increasing demand for using mass flow meters (such as Coriolis mass flow meters) to replace traditional volumetric flow meters.

[0004] On the one hand, the use of mass flow meters to replace traditional volumetric flow meters needs to consider the cost of mass flow meters; on the other hand, the size of mass flow meters needs to be considered to be compatible with the space in existing equipment (such as fuel dispensers); on the other hand, the installation convenience of mass flow meters in existing equipment also needs to be considered. In particular, fuel dispensers used in gas stations usually need to use two or more independent flow meters in limited space in order to be able to add different fuels according to the needs of vehicles or to simultaneously add fuels for multiple vehicles and perform metering and charging.

[0005] The Coriolis mass flow meter of the related art mainly has two types, one is a mass flow meter including only a single flow tube (also referred to as a "fluid conduit"), and the other is a mass flow meter including double parallel flow tubes. The mass flow meter including double parallel flow tubes has many components, requires a large installation space, and has a high cost. The use of the mass flow meter including only a single flow tube is limited by the requirement that the total mass of the flow tube and the fluid to be contained in the flow tube needs to be less than the mass of the base supporting the flow tube, and therefore, it is only suitable for flow tubes of a small size (for example, usually less than 0.25 inches (6.35 mm)). In addition, in cases where multiple mass flow meters need to be used simultaneously, such as in fuel dispensers, whether two or more mass flow meters including double parallel flow tubes are used or two or more mass flow meters including only a single flow tube are used, each mass flow meter needs to be separately installed in the fuel dispenser, which is complicated and has a high installation cost. SUMMARY

[0006] The present application aims to solve one or more of the above technical problems.

[0007] In particular, the utility model aims at providing a mass flow meter which can simultaneously and independently measure mass flow of multiple fluid streams.

[0008] In particular, the utility model also aims at providing a mass flow meter which is low in manufacturing cost, compact in structure and convenient to install.

[0009] In the first aspect of the utility model, a mass flow meter is provided. The mass flow meter comprises a base and multiple flow tubes arranged on the base. Each of the multiple flow tubes is configured to pass through an independent fluid stream and is equipped with a respective driver and detector for independently measuring mass flow of the fluid stream passing through the corresponding flow tube.

[0010] In the utility model, multiple flow tubes are integrated on the same base, so that one mass flow meter can be used to simultaneously and independently measure mass flow of multiple fluid streams. The base simultaneously serves as a very strong rigid base for the multiple flow tubes. When it is necessary to simultaneously measure mass flow of multiple independent fluid streams in one device (for example, a fuel dispenser), compared with constructing multiple separate mass flow meters, the mass flow meter provided by the utility model can reduce manufacturing cost and shorten manufacturing time on the one hand, and can simplify installation of the mass flow meter on the other hand. In the related art, when it is necessary to simultaneously measure mass flow of multiple fluid streams in one device, each mass flow meter needs to be installed in the device one by one. In the utility model, multiple flow tubes respectively used to independently measure mass flow of fluid streams are integrated on the same base, and then the mass flow meter integrated with the multiple flow tubes independently measuring mass flow of fluid streams is installed in the device as a whole, so that installation of the mass flow meter can be simplified. In addition, compared with installing multiple separate mass flow meters in the device, by installing the mass flow meter integrated with the multiple flow tubes independently measuring mass flow of fluid streams in the device as a whole, the structure of the mass flow meter can be more compact, and installation space can be saved. In addition, when it is necessary to measure fluid flow in an external pipe with a large size, the multiple-channel manifold which communicates the external pipe with the multiple flow tubes can be added in the mass flow meter, and measurement results of the multiple flow tubes can be added, so that the fluid flow in the external pipe with the large size can be measured without excessively increasing size of each flow tube and mass of the base.

[0011] Optionally, the base is a plate-shaped member, and the multiple flow tubes are two flow tubes arranged on two opposite surfaces of the base in the thickness direction.

[0012] Optionally, the two flow tubes are configured for fluid flow formed by fluid of the same kind, and are driven by the driver to vibrate at the same frequency and 180° out of phase. In this way, vibration balance between the two flow tubes can be achieved, thereby reducing the requirement for rigidity of the base, so that the base can have a relatively small mass, thereby having a relatively small size, to save manufacturing cost and required installation space.

[0013] Optionally, the two flow tubes are configured for fluid flow formed by fluid of different kinds.

[0014] Optionally, the plurality of flow tubes includes more than two flow tubes, and the more than two flow tubes are respectively arranged on different side surfaces of the base.

[0015] Optionally, the base is in the shape of a prism.

[0016] Optionally, the base includes a plurality of side walls, the side walls are plate-like members, and the plurality of side walls are connected end to end to enclose the base having an accommodation space, and the plurality of flow tubes are respectively arranged on inner surfaces of the side walls. In this way, the base can be used as a part of a housing for protecting the flow tubes placed in the internal accommodation space thereof, and the number of components can be saved, thereby saving manufacturing cost. In addition, the base is enclosed by eight plate-like members connected end to end, and each plate-like member and the flow tube arranged thereon can be pre-manufactured and calibrated, and then connected together by, for example, welding, to enclose the base, thereby facilitating assembly.

[0017] Optionally, the mass flow meter includes an end cover connected to the plate-like members at ends of the base to cover the accommodation space, and a mounting shaft extending through the accommodation space and the shaft hole of the end cover and connected to the end cover at the shaft hole. In this way, the plate-like members can be conveniently assembled to the end cover; in addition, the rigidity of the base can also be enhanced.

[0018] Optionally, the mass flow meter includes a plurality of housings respectively attached to the base to enclose a plurality of accommodation spaces with the base, and each accommodation space accommodates one of the plurality of flow tubes and its driver and detector. In this way, individual flow tubes can be conveniently replaced or repaired.

[0019] Optionally, the mass flow meter includes a housing having an accommodation space formed therein, and the base and the plurality of flow tubes are arranged in the accommodation space.

[0020] Optionally, the housing comprises two symmetrically arranged half-housings, and the two half-housings are connected to each other to form the containing space inside the housing. The two symmetrically arranged half-housings can be manufactured by the same mold, which simplifies the manufacturing process and reduces the manufacturing cost.

[0021] Optionally, the plurality of flow tubes have the same shape.

[0022] Optionally, the plurality of flow tubes have an "Ω" shape or an inverted "U" shape.

[0023] Optionally, the mass flow meter comprises a processor unit arranged on the base and configured to communicate with the detector. In this way, signal transmission can be facilitated.

[0024] In a second aspect of the present application, a fluid dispensing device is also provided. The fluid dispensing device comprises any one of the mass flow meters described above. The fluid dispensing device can also achieve the technical effects described above for the mass flow meter due to the provision of any one of the mass flow meters described above. Here, for the sake of brevity, no further description is given. BRIEF DESCRIPTION OF DRAWINGS

[0025] The foregoing and other features and characteristics of the present application will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate by way of example only. The same reference signs are used in the drawings to indicate the same components. In the drawings:

[0026] Figure 1 is a perspective view of a mass flow meter according to the first embodiment of the present application;

[0027] Figure 2 is Figure 1 is an exploded view of the housing of the mass flow meter shown in FIG. 1;

[0028] Figure 3 is Figure 1 is a perspective view of the mass flow meter shown in FIG. 1, with the housing removed to show the internal structure;

[0029] Figure 4 is Figure 3 is a front view of the mass flow meter shown in FIG. 1;

[0030] Figure 5 is Figure 3 is a bottom view of the mass flow meter shown in FIG. 1;

[0031] Figure 6 is a perspective view of a mass flow meter according to the second embodiment of the present application;

[0032] is a perspective view of a mass flow meter according to the second embodiment of the present application;Figure 7 is Figure 6 a side view schematic of a mass flow meter shown in FIG.

[0033] Figure 8 is Figure 6 a perspective view schematic of a portion of a housing of a mass flow meter shown in FIG.

[0034] Figure 9 is a perspective view schematic of a mass flow meter according to a third embodiment of the present application;

[0035] Figure 10 is Figure 9 an exploded view schematic of a housing of a mass flow meter shown in FIG.

[0036] Figure 11 is Figure 9 a perspective view schematic of a mass flow meter shown in FIG. 4, with the housing removed to show internal structure;

[0037] Figure 12 is a perspective view schematic of a mass flow meter according to a fourth embodiment of the present application;

[0038] Figure 13 is Figure 12 a top view schematic of a mass flow meter shown in FIG.

[0039] Figure 14 is Figure 12 a perspective view schematic of a mass flow meter shown in FIG. 5, with the housing removed to show internal structure;

[0040] Figure 15 is a perspective view schematic of a mass flow meter according to a fifth embodiment of the present application;

[0041] Figure 16 is Figure 15 a top view schematic of a mass flow meter shown in FIG.

[0042] Figure 17 is a perspective view schematic of a mass flow meter according to a sixth embodiment of the present application;

[0043] Figure 18 is Figure 17 another perspective view schematic of a mass flow meter shown in FIG. 6, with an end cover of the mass flow meter removed to show internal structure;

[0044] Figure 19 is Figure 17 a perspective view schematic of an end cover of a mass flow meter shown in FIG. 6; and

[0045] Figure 20 is Figure 17A schematic diagram of a portion of a mass flow meter is shown. DETAILED DESCRIPTION

[0046] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The following description is merely illustrative in nature and is not intended to limit the present invention and its applications or uses.

[0047] The present invention provides a mass flow meter that can be used, for example, in a fuel dispenser at a gas station or any other suitable fluid dispensing device to measure the mass flow of a fluid. The present invention also provides a fluid dispensing device including the mass flow meter, such as a fuel dispenser used in a gas station or any other suitable fluid dispensing device.

[0048] Figures 1 to 5 FIG. 1 shows a mass flow meter 100 according to a first embodiment of the present invention. Specifically, Figure 1 is a perspective schematic diagram of a mass flow meter 100 according to a first embodiment of the present utility model; Figure 2 yes Figure 1 FIG. 1 is a schematic diagram of a disassembled housing 110 of the mass flow meter 100; FIG.

[0049] Figure 3 yes Figure 1 Schematic perspective view of the mass flow meter 100 shown in FIG, wherein the housing 110 is removed to show the internal structure; Figure 4 yes Figure 3 A schematic front view of the mass flow meter 100 shown in FIG. Figure 5 yes Figure 3 The mass flow meter 100 is shown in FIG. Figures 1 to 5 The mass flowmeter 100 according to the first embodiment will be described in detail.

[0050] like Figure 1 and Figure 2 As shown, the mass flow meter 100 optionally includes a housing 110, and a storage space may be formed in the housing 110 for accommodating other components of the mass flow meter 100 to be described below. Specifically, in the first embodiment, the housing 110 includes a shell 111 and a base plate 112. The shell 111 has a generally semicircular cross-sectional shape and has a bottom opening (not shown) at the bottom. The base plate 112 is a plate-like member for covering the bottom opening of the shell 111, thereby enclosing the storage space of the housing 110 together with the shell 111. The base plate 112 can be connected to the shell 111 in any suitable manner (e.g., welding, snap fit, threaded fastener connection).

[0051] It should be noted that the "plate-like component" referred to herein is a component that, when placed in a three-dimensional coordinate system, has a dimension in one direction that is significantly smaller than its dimensions in the other two directions. The dimension in the one direction is the "thickness" of the plate-like component.

[0052] like Figure 1 as well as Figures 3 to 5 As shown, the mass flowmeter 100 further includes a base 120 disposed within the housing 110. Specifically, in the first embodiment, the base 120 is a plate-like member having a generally semicircular cross-sectional shape. The shape and dimensions of the base 120 are configured to be accommodated within the housing 110. The base 120 can overlap the inner surface of the housing 111 and be connected to the housing 111 by internal welding. The base 120 can be made of any suitable rigid material, such as stainless steel or carbon steel.

[0053] like Figures 1 to 5 As shown, the mass flowmeter 100 further includes two flow tubes 130 disposed within the housing 110. The two flow tubes 130 are disposed on a base 120. The two flow tubes 130 are disposed on opposite surfaces of the base 120 in the thickness direction. The two flow tubes 130 share the same base 120, wherein the mass of the base 120 is configured to be greater than the combined mass of the two flow tubes 130 mounted thereon and the fluid contained therein. This allows the base 120 to remain stationary even when the flow tubes 130 and the fluid flowing therethrough vibrate as described below. The two flow tubes 130 have the same shape. Specifically, in the first embodiment, both flow tubes 130 are generally Ω-shaped. Each flow tube 130 is configured to allow an independent fluid stream to flow therethrough. Therefore, each flow tube 130 includes a fluid inlet section 131 and a fluid outlet section 132. The fluid inlet section 131 and the fluid outlet section 132 can respectively extend through the flow tube opening 113 on the housing 110 to be connected to an external pipeline. Specifically, in the first embodiment, the flow tube opening 113 is provided on the side of the housing 111. The fluid to be measured flows into the flow tube 130 through the fluid inlet section 131 and flows out of the flow tube 130 through the fluid outlet section 132. The two flow tubes 130 can be configured to flow through fluid streams formed by the same type of fluid, for example, to simultaneously refuel multiple vehicles with the same fuel. The two flow tubes 130 can also be configured to flow through fluid streams formed by different types of fluids, for example, to refuel vehicles with different fuels according to vehicle needs. The flow directions of the fluid streams in the two flow tubes 130 can be the same or opposite.

[0054] like Figures 3 to 5As shown, each flow tube 130 is equipped with a respective driver 133, detector 134 and processor unit 135 for independently measuring the mass flow of the fluid flow passing through the corresponding flow tube 130. Each flow tube 130 can be calibrated individually. The driver 133 can include an electromagnetic excitation coil fixed to the base 120 at the top of the flow tube 130 and a pair of magnets and their holders fixed to the flow tube 130 at the corresponding positions by, for example, welding. The driver 133 is used to drive the corresponding flow tube 130 to vibrate with a small amplitude (e.g. less than 1 mm). Preferably, when two flow tubes 130 are configured for fluid flows formed by the same kind of fluid, the two flow tubes 130 are driven by the respective drivers 133 to vibrate at the same frequency and with 180° anti-phase, to achieve as much as possible the vibration balance between the two flow tubes 130, thereby reducing the requirement for the rigidity of the base 120, so that the base 120 can have a relatively small mass and thus a relatively small size, to save the manufacturing cost and the required installation space. The flowing fluid generates a Coriolis force within the vibrating flow tube 130, causing the flow tube 130 to twist. This twist is detected by the detectors 134 located on both sides of the flow tube 130. The detectors 134 can be velocity sensors, and the two velocity sensors are located on both sides of the flow tube 130, respectively. The detectors 134 send the detected signals to the processor unit 135. The processor unit 135 is configured to communicate with the detectors 134 and process the signals detected by the detectors 134 to obtain the mass flow. The processor unit 135 can be a functional signal processing unit or a conventional transmitter. The processor unit 135 is disposed on the base 110 and located at the blank area between the two detectors 134, to save space and facilitate signal transmission. Optionally, the drivers 133 and the parts of the two detectors 134 fixed to the base 120 or not mounted on the flow tubes 130 (e.g. the electromagnetic excitation coil) can be disposed on the enlarged processor unit 135 and integrated with the processor unit 135, to facilitate the maximized simplification of the installation manufacturing process.

[0055] In the first embodiment, by integrating two flow tubes 130 on the same base 120, one mass flow meter 100 can be used to simultaneously and independently measure the mass flow of two fluid streams. The base 120 simultaneously serves as a very strong rigid base for both flow tubes 130. When it is necessary to simultaneously measure the mass flow of two independent fluid streams in one device (e.g. a fuel dispenser), the mass flow meter 100 of the first embodiment can reduce manufacturing cost and shorten manufacturing time on one hand, especially compared to constructing two separate mass flow meters including double parallel flow tubes, the number of required parts is greatly reduced, thus the manufacturing cost can be greatly reduced. On the other hand, the installation of the mass flow meter can be simplified. In the related art, when it is necessary to simultaneously measure the mass flow of multiple fluid streams in one device, each mass flow meter needs to be installed in the device one by one. In the first embodiment, by integrating two flow tubes 130 for independently measuring the mass flow of fluid streams on the same base 120, and then installing the mass flow meter 100 integrated with two flow tubes 130 for independently measuring the mass flow of fluid streams as a whole in the device, the installation of the mass flow meter 100 can be simplified. In addition, by installing the mass flow meter 100 integrated with two flow tubes 130 for independently measuring the mass flow of fluid streams as a whole in the device, the structure of the mass flow meter 100 can be more compact, and the installation space can be saved compared to installing two separate mass flow meters in the device. In addition, when it is necessary to measure the fluid flow in an external pipe with a large size, it can be achieved by adding a multi-channel manifold in the mass flow meter 100 which communicates the external pipe with both flow tubes 130, and adding the measurement results of the two flow tubes 130, without excessively increasing the size of each flow tube 130 and the mass of the base 120.

[0056] Figures 6 to 8 A mass flow meter 200 according to the second embodiment of the present application is shown. Specifically, Figure 6 is a perspective view of a mass flow meter 200 according to the second embodiment of the present application; Figure 7 is a side view of the mass flow meter 200 shown in Figure 6 ; and Figure 8 is a perspective view of a part of the housing 210 of the mass flow meter 200 shown in Figure 6 . Figures 6 to 8 The mass flow meter 200 shown is substantially the same as the mass flow meter 100 of the first embodiment shown in Figures 1 to 5 , with the only difference being the structure of the housing 210.

[0057] As shown in Figures 6 to 8As shown, the mass flowmeter 200 includes a housing 210, within which a receiving space may be formed. Specifically, in the second embodiment, the housing 210 includes two symmetrically arranged half-shells 211, which may be manufactured using a common mold. The two half-shells 211 may be connected to each other by any suitable means (e.g., welding, snap-fitting, or threaded fasteners) to form a receiving space within the housing 210.

[0058] like Figures 6 to 8 As shown, the mass flow meter 200 is also provided with a base 220 and two flow tubes 230 provided on the base 220. The two flow tubes 230 share the same base 220. The base 220 and the two flow tubes 230 can be located in the accommodation space of the housing 210. Each flow tube 230 is configured to flow an independent fluid flow so as to independently measure the mass flow rate of the fluid flow flowing through the corresponding flow tube 230. The structure and arrangement of the base 220, the two flow tubes 230, and the drivers, detectors, and processor units equipped with the two flow tubes 230 are similar to those of the embodiment of the present invention. Figures 1 to 5 The structures and settings of the base 110 and the two flow tubes 130 as well as the drivers 133, detectors 134 and processor units 135 of the mass flow meter 100 of the first embodiment shown in FIG are exactly the same, and are not described again for the sake of brevity.

[0059] In the second embodiment, by integrating two flow tubes 230 on the same base 220, similar technical effects as those described above for the first embodiment can be achieved. For the sake of brevity, this description will not be repeated here. Furthermore, in the second embodiment, the two symmetrically arranged half-shells 211 can be manufactured using a single mold, simplifying the manufacturing process and reducing manufacturing costs.

[0060] Figures 9 to 11 FIG. 3 shows a mass flow meter 300 according to a third embodiment of the present invention. Specifically, Figure 9 is a perspective schematic diagram of a mass flow meter 300 according to a third embodiment of the present invention; Figure 10 yes Figure 9 Schematic diagram of the disassembly of the housing 310 of the mass flow meter 300 shown in FIG; and Figure 11 yes Figure 9 FIG. 3 is a perspective schematic diagram of a mass flow meter 300 shown in FIG. 4 , in which the housing 310 is removed to show the internal structure. Figures 9 to 11 The mass flow meter 300 shown is substantially the same as the mass flow meter 100 of the first embodiment, and differs only in the shapes of the housing 310 , the base 320 , and the flow tube 330 , and the arrangement of the processor unit (not shown).

[0061] likeFigure 9 and Figure 10 As shown, the mass flowmeter 300 includes a housing 310, in which a storage space may be formed. Specifically, in the third embodiment, the housing 310 includes a housing cover 311 and a base plate 312. The housing cover 311 is a one-piece spherical cylindrical shape having a generally inverted "U"-shaped cross-section and a generally circular bottom opening 314 at the bottom. The base plate 312 is a circular plate-like member used to cover the bottom opening 314 of the housing cover 311, thereby enclosing the storage space of the housing 310 together with the housing cover 311. The base plate 312 can be connected to the housing cover 311 in any suitable manner (e.g., welding, snap fit, or threaded fastener connection). It will be understood that the housing 310 may also have other shapes, such as a conventional cylindrical shape. In addition, the housing 310 may also be formed into a spherical cylindrical or conventional cylindrical shape by two symmetrically arranged half shells as shown in the second embodiment.

[0062] like Figure 9 and Figure 11 As shown, the mass flow meter 300 further includes a base 320 disposed in the accommodation space of the housing 310. Specifically, in the third embodiment, the base 320 is a plate-like member having a generally rectangular cross-sectional shape. The shape and size of the base 320 are configured to be accommodated in the accommodation space of the housing 310.

[0063] like Figures 9 to 11 As shown, the mass flowmeter 300 further includes two flow tubes 330 disposed on a base 320. The two flow tubes 330 are disposed on opposite surfaces of the base 320 in the thickness direction. The two flow tubes 330 share the same base 320. The mass of the base 320 is configured to be greater than the combined mass of the two flow tubes 330 mounted thereon and the fluid contained therein, so that the base 320 remains stationary even when the flow tubes 330 and the fluid flowing therethrough vibrate. The two flow tubes 330 have the same shape. Specifically, in the third embodiment, both flow tubes 330 are generally inverted U-shaped. Each flow tube 330 is configured to allow an independent fluid stream to flow therethrough. Therefore, each flow tube 330 includes a fluid inlet section 331 and a fluid outlet section 332. The fluid inlet section 331 and the fluid outlet section 332 can each extend through a flow tube opening 313 in the housing 310 for connection to an external pipeline. Specifically, in the third embodiment, the flow tube opening 313 is provided on the bottom plate 312 . The fluid to be measured flows into the flow tube 330 through the fluid inlet section 331 and flows out of the flow tube 330 through the fluid outlet section 332 .

[0064] like Figure 11As shown, each flow tube 330 is equipped with a respective driver 333 and detector 334. The drivers 333 and detectors 334 are connected to the processor unit (not shown) outside the housing 310 for processing the signals detected by the detectors 334 to obtain the mass flow rate. Figures 1 to 5 The drivers 133 and detectors 134 of the mass flow meter 100 of the first embodiment shown in FIG. 1 are the same as those of the third embodiment shown in FIG. 3. Different from the first embodiment, in the third embodiment, the base 320 is not provided with a processor unit. The detectors 334 send the detected signals to a processor unit (not shown) outside the housing 310 for processing to obtain the mass flow rate. The detectors 334 of each flow tube 330 can send the detected signals to different processor units outside the housing 310 for processing, or can send the detected signals to the same processor unit outside the housing 310 for processing.

[0065] In the third embodiment, by integrating two flow tubes 330 on the same base 320, similar technical effects as those described above for the first embodiment can also be achieved. Here, for brevity, no further elaboration is made.

[0066] Figures 12 to 14 A mass flow meter 400 according to a fourth embodiment of the present application is shown. Specifically, Figure 12 is a perspective view of the mass flow meter 400 according to the fourth embodiment of the present application; Figure 13 is Figure 12 is a top view of the mass flow meter 400 shown in FIG. 4; and Figure 14 is Figure 12 is a perspective view of the mass flow meter 400 shown in FIG. 4, with the housing 410 removed to show the internal structure.

[0067] As Figures 12 to 14As shown, the mass flow meter 400 comprises a base 420 and three flow tubes 430 arranged on the base 420. Specifically, in the fourth embodiment, the base 420 is a triangular prism. The three flow tubes 430 are arranged on three side surfaces of the base 420, respectively. The three flow tubes 430 share the same base 420, wherein the mass of the base 420 is configured to be greater than the total mass of the three flow tubes 430 mounted on the base 420 and the fluid to be contained therein, so that the base 420 can still remain fixed when the flow tubes 430 and the fluid flowing in the flow tubes 430 vibrate. Optionally, a hollow portion 421 can be arranged in the base 420 to reduce the mass of the base 420 as much as possible while meeting the mass requirement. The three flow tubes 430 are each in a substantially "Ω" shape. Each flow tube 430 is configured to flow through an independent fluid flow for independently measuring the mass flow of the fluid flow through the corresponding flow tube 430. Therefore, each flow tube 430 comprises a fluid inlet section 431 and a fluid outlet section 432, respectively. Like the mass flow meter 100 according to the first embodiment of the present application, in the fourth embodiment, each flow tube 430 is equipped with a respective driver 433, a detector 434 and a processor unit 435. The structure and arrangement of the driver 433, the detector 434 and the processor unit 435 equipped for each flow tube 430 are exactly the same as those of the driver 133, the detector 134 and the processor unit 135 equipped for the flow tube 130 in the first embodiment, which will not be described here for brevity

[0068] As shown in Figure 12 and Figure 13 The mass flow meter 400 further comprises housings 410 for covering the flow tubes 430. Specifically, in the fourth embodiment, the mass flow meter 400 comprises three housings 410, each of which is used to cover a single flow tube 430. Specifically, the three housings 410 are attached to the base 420 to enclose three containing spaces together with the side surfaces of the base 420, in which the flow tubes 430 and their respective drivers 433, detectors 434 and optional processor units 435 are contained. The housings 410 are formed with flow tube openings 413 for the fluid inlet sections 431 and the fluid outlet sections 432 of the flow tubes 430 to extend out, so that the flow tubes 430 can be connected with external pipelines.

[0069] In the fourth embodiment, similar technical effects as set forth above for the first embodiment can also be achieved by integrating three flow tubes 430 on the same base 420. Here, for brevity, the technical effects will not be repeated. In addition, in the fourth embodiment, a number of housings 410 corresponding to the number of flow tubes 430 are provided, each housing 410 is used to cover a single flow tube 430, which can facilitate the individual replacement or maintenance of a single flow tube 430.

[0070] Figures 15 to 16 A mass flow meter 500 according to a fifth embodiment of the present application is shown. Specifically, Figure 15 is a perspective view of a mass flow meter 500 according to the fifth embodiment of the present application; and Figure 16 is Figure 15 is a top view of the mass flow meter 500 shown in Figures 15 to 16 The mass flow meter 500 shown in

[0071] As Figures 15 to 16As shown, the mass flow meter 500 includes a base 520 and eight flow tubes 530 disposed on the base 520. Specifically, in the fifth embodiment, the base 520 is an octagonal prism. The eight flow tubes 530 are respectively disposed on the eight side surfaces of the base 520. The eight flow tubes 530 share the same base 520. The eight flow tubes 530 are each in a substantially "Ω" shape. Each flow tube 530 is configured for a separate fluid flow therethrough. Thus, each flow tube 530 includes a fluid inlet section 531 and a fluid outlet section 532, respectively. The fluid to be measured flows into the flow tube 530 via the fluid inlet section 531 and out of the flow tube 530 via the fluid outlet section 532. Each flow tube 530 is equipped with a respective driver 533, detector 534, and processor unit 535 for independently measuring the mass flow of the fluid flowing through the corresponding flow tube 530. The structure and arrangement of the driver 533, detector 534, and processor unit 535 are exactly the same as those of the driver 133, detector 134, and processor unit 135 in the first embodiment, which will not be repeated here for brevity. Although not shown, it can be appreciated that the mass flow meter 500 of the fifth embodiment can also include a housing that can house the base 520 and the eight flow tubes 530 within its housing space, or can form a plurality of housing spaces together with the base 520, each of which is used to house one flow tube 530. In addition, it can be appreciated that in other embodiments of the present application not shown, the shape of the base can be other prisms, such as a four-prism, a five-prism, a six-prism, etc., and the mass flow meter can include other numbers of flow tubes, which are respectively disposed on different side surfaces of the base. The shapes of the flow tubes disposed on different side surfaces can be the same or different. In addition, the shape of the base can also be other polyhedrons.

[0072] In the fifth embodiment of the present application, by integrating the eight flow tubes 530 on the same base 520, similar technical effects as described above for the first embodiment can also be achieved. Here, for brevity, will not be repeated.

[0073] Figures 17 to 20 A mass flow meter 600 according to a sixth embodiment of the present application is shown. Specifically, Figure 17 is a perspective view of the mass flow meter 600 according to the sixth embodiment of the present application; Figure 18 is Figure 17 is another perspective view of the mass flow meter 600 shown in FIG. 6B, wherein an end cover 640 of the mass flow meter 600 is removed to show the internal structure; Figure 19 is Figure 17 is a perspective view of the end cover 640 of the mass flow meter 600 shown in FIG. 6B; and Figure 20 isFigure 17 A schematic diagram of a portion of a mass flow meter 600 is shown in FIG. Figures 17 to 20 The mass flowmeter 600 shown in FIG. 5 is substantially the same as the mass flowmeter 500 of the fifth embodiment, and differs only in the structure of the base 620 and the position of the flow tube 630 on the base 620 .

[0074] like Figures 17 to 20 As shown, the mass flowmeter 600 includes a base 620 and eight flow tubes 630 disposed on the base 620. Specifically, the base 620 is a hollow octagonal prism structure. Unlike the base 520 in the fifth embodiment, in the sixth embodiment, the base 620 has a storage space, which can be enclosed by eight plate-like members 621 connected end to end. These eight plate-like members 621 constitute the eight side walls of the base 620. The eight flow tubes 630 are respectively disposed on the inner surfaces of the eight side walls (i.e., the eight plate-like members 621) of the base 620. Each flow tube 630 is configured for flowing an independent fluid flow and is equipped with its own driver, detector, and processor unit for independently measuring the mass flow rate of the fluid flow flowing through the corresponding flow tube 630. The structure and arrangement of the driver, detector, and processor unit can be exactly the same as the structure and arrangement of the driver 133, detector 134, and processor unit 135 in the first embodiment, and will not be repeated here for the sake of brevity.

[0075] like Figure 17 and Figure 19 As shown, the mass flowmeter 600 further includes end covers 640. Specifically, in the sixth embodiment, the mass flowmeter 600 includes two end covers 640, respectively located at both ends of the base 620. The end covers 640 are connected to the plate-shaped member 621, which serves as the side wall of the base 620, at the ends of the base 620 to cover the accommodation space of the base 620 and the flow tubes 630 located therein. The end covers 640 are provided with flow tube openings 613 matching the number of flow tubes 630, for allowing the fluid inlet sections (not shown) and fluid outlet sections (not shown) of the flow tubes 630 to pass therethrough and be connected to external pipelines.

[0076] In the sixth embodiment, the base 620 can be shared by eight flow tubes 630, and thus, similar technical effects to those described above for the first embodiment can be achieved. Here, for the sake of brevity, the description will not be repeated. In addition, the base 620 can also serve as a part of the housing for protecting the flow tubes 630 housed in the internal accommodation space thereof, and thus, the number of parts can be reduced and the manufacturing cost can be saved. In addition, the base 620 is formed by connecting eight plate-like members 621 end to end, and each plate-like member 621 and the flow tube 630 provided thereon can be manufactured and calibrated in advance and then connected together, for example, by welding, to form the base 620, and thus, the assembly is facilitated.

[0077] Preferably, in the sixth embodiment, the mass flow meter 600 further includes a mounting shaft 650. Specifically, the end cover 640 of the mass flow meter 600 is provided with a shaft hole 641 through which the mounting shaft 650 passes. The mounting shaft 650 extends through the accommodation space of the base 620 and the shaft hole 641 of the end cover 640 and is connected to the end cover 640 at the shaft hole 641, for example, by welding. The end cover 640 is fixed to the mounting shaft 650, and thus, the plate-like members 621 can be easily assembled to the end cover 640 to form the base 620 having the accommodation space. In addition, the mounting shaft 650 can also strengthen the rigidity of the base 620.

[0078] In summary, in the utility model, through the multiple flow tubes are integrated on the same base, one mass flow meter can be used to measure the mass flow of multiple fluid flows simultaneously and independently. The base serves as a very strong rigid base for the multiple flow tubes. When the mass flow of multiple independent fluid flows needs to be measured simultaneously in one device (for example, a fuel dispenser), compared with constructing multiple separate mass flow meters, the mass flow meter provided by the utility model can reduce the manufacturing cost and shorten the manufacturing time on the one hand, and can simplify the installation of the mass flow meter on the other hand. In the related art, when the mass flow of multiple fluid flows needs to be measured simultaneously in one device, each mass flow meter needs to be installed in the device one by one. In the utility model, by integrating the multiple flow tubes for independently measuring the mass flow of fluid flows on the same base, and then installing the mass flow meter integrated with the multiple flow tubes for independently measuring the mass flow of fluid flows as a whole in the device, the installation of the mass flow meter can be simplified. In addition, compared with installing multiple separate mass flow meters in the device, by installing the mass flow meter integrated with the multiple flow tubes for independently measuring the mass flow of fluid flows as a whole in the device, the structure of the mass flow meter can be more compact, and the installation space can be saved. In addition, when the fluid flow in an external pipe with a large size needs to be measured, the multiple-channel manifold for connecting the external pipe and the multiple flow tubes can be added in the mass flow meter, and the measurement results of the multiple flow tubes are added, so that the fluid flow in the external pipe with a large size can be measured without excessively increasing the size of each flow tube and the mass of the base.

[0079] It should be understood that various different embodiments can be further designed by combining different embodiments and various technical features in different manners or modifying them.

[0080] The mass flow meter and the fluid dispensing device according to the preferred embodiments of the utility model are described above in combination with specific embodiments. It can be understood that the above description is only exemplary and not restrictive, and those skilled in the art can think of various modifications and changes with reference to the above description without departing from the scope of the utility model. These modifications and changes are also included in the protection scope of the present application.

Claims

1. A mass flow meter characterized by, The mass flow meter includes: a base; and a plurality of flow tubes disposed on the base, each of the plurality of flow tubes configured to flow through an independent fluid stream and equipped with a respective driver and detector for independently measuring a mass flow of the fluid stream flowing through the corresponding flow tube.

2. The mass flow meter of claim 1, wherein, The base is a plate-shaped member, and the plurality of flow tubes are two flow tubes respectively disposed on two surfaces of the base in opposite directions in a thickness direction.

3. The mass flow meter of claim 2, wherein, The two flow tubes are configured to flow through fluid streams formed of the same kind of fluid, and are driven by the driver to vibrate at the same frequency and 180° out of phase.

4. The mass flow meter of claim 2, wherein, The two flow tubes are configured to flow through fluid streams formed of different kinds of fluid.

5. The mass flow meter of claim 1, wherein, The plurality of flow tubes include more than two flow tubes respectively disposed on different side surfaces of the base.

6. The mass flow meter of claim 1, wherein, The base has a shape of a prism.

7. The mass flow meter of claim 1, wherein, The base includes a plurality of side walls, which are plate-shaped members, and the plurality of side walls are connected end to end to enclose the base having an accommodation space, and the plurality of flow tubes are respectively disposed on inner surfaces of the side walls.

8. The mass flow meter of claim 7, wherein, The mass flow meter includes an end cover connected to the plate-shaped member at an end of the base to cover the accommodation space, and a mounting shaft extending through the accommodation space and the shaft hole and connected to the end cover at the shaft hole.

9. The mass flow meter of claim 1, wherein, The mass flow meter includes a plurality of housings respectively attached to the base to enclose a plurality of accommodation spaces with the base, and each of the accommodation spaces accommodates one of the plurality of flow tubes and its driver and detector.

10. The mass flow meter of claim 1, wherein, The mass flow meter includes a housing in which an accommodation space is formed, and the base and the plurality of flow tubes are disposed in the accommodation space.

11. The mass flow meter of claim 10, wherein, The housing includes two symmetrically disposed half housings connected to each other to form the accommodation space inside the housing.

12. The mass flow meter of claim 1, wherein, The plurality of flow tubes have the same shape.

13. The mass flow meter of claim 12, wherein, The plurality of flow tubes have an "Ω" shape or an inverted "U" shape.

14. The mass flow meter of any one of claims 1 to 13, wherein, The mass flow meter includes a processor unit disposed on the base and configured to communicate with the detectors.

15. A fluid dispensing device characterized by, The fluid dispensing apparatus includes the mass flow meter according to any one of claims 1 to 14.

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