Fluid metering filling device

Abstract

The utility model discloses a kind of fluid metering filling devices, including flow detection module, flow detection module includes first main part, throttle plug, upstream pressure sensor and downstream pressure sensor.First main part includes first fluid passage, upstream pressure acquisition channel and downstream pressure acquisition channel.Throttle plug is connected in first fluid passage with screw thread, and located between upstream pressure acquisition channel and downstream pressure acquisition channel, throttle plug includes the mounting hole and throttle hole along its axial arrangement.Upstream pressure sensor and downstream pressure sensor are used to detect fluid pressure.The utility model is internally provided with the throttle plug of detachable flow detection module to change the fluid pressure of upstream and downstream, and the corresponding fluid flow is calculated based on the fluid pressure difference of upstream and downstream.The mounting hole of throttle plug can be matched with external torque exerting tool to screw throttle plug, so as to install, detach and replace throttle plug, improve the versatility and expansibility of flow detection module.

Description

Technical Field

[0001] This utility model belongs to the field of fluid filling technology, specifically relating to a fluid metering and filling device. Background Technology

[0002] In industries such as chemical, energy, pharmaceutical, and food processing, fluid metering and dispensing devices are widely used in scenarios involving material proportioning, quantitative conveying, and precision filling. The flow detection module is the core component of existing fluid metering and dispensing devices, primarily used for real-time monitoring and control of fluid flow.

[0003] Existing flow detection modules generally include a flow meter and an electrically controlled valve. The flow meter is responsible for detecting the fluid flow rate, while the electrically controlled valve is responsible for regulating the fluid flow rate within the flow meter. Existing flow meters generally include orifice plate flow meters, vortex flow meters, thermal flow meters, turbine flow meters, and electromagnetic flow meters. Orifice plate flow meters often require customized design to meet user needs, resulting in poor versatility and expandability; vortex flow meters perform poorly in environments with high vibration because their vortex detection element is very sensitive to vibration; thermal flow meters introduce errors when the fluid temperature changes and are relatively expensive; turbine flow meters operate with a high-speed rotating turbine, thus requiring regular maintenance to address axial wear or replace the impeller, resulting in a shorter lifespan, and shaft wear leads to measurement degradation; electromagnetic flow meters cannot detect non-conductive gases and liquids, limiting their applicability.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a fluid metering and filling device that solves the problem that the flow meter of the fluid metering and filling device cannot meet the numerous flow detection needs.

[0006] To achieve the above objectives, a specific embodiment of this utility model provides a fluid metering and dispensing device. The fluid metering and dispensing device includes a flow detection module, which comprises a first main body, a throttling plug, an upstream pressure sensor, and a downstream pressure sensor. The first main body includes a first fluid channel, an upstream pressure acquisition channel connected to the first fluid channel, and a downstream pressure acquisition channel connected to the first fluid channel. The throttling plug is threaded into the first fluid channel and located between the upstream and downstream pressure acquisition channels. The throttling plug includes a mounting hole and a throttling orifice arranged axially. The diameter of the throttling orifice is smaller than the diameter of the mounting hole. On a plane perpendicular to the axial direction of the throttling plug, the vertical projection of the mounting hole is polygonal. The upstream pressure sensor detects the fluid pressure in the upstream pressure acquisition channel, and the downstream pressure sensor detects the fluid pressure in the downstream pressure acquisition channel.

[0007] In one or more embodiments of this utility model, the throttling orifice is located on the side of the mounting hole near the downstream pressure acquisition channel.

[0008] In one or more embodiments of this utility model, in the axial direction of the first fluid channel, the distance between the upstream end of the downstream pressure acquisition channel and the throttle plug is smaller than the distance between its downstream end and the throttle plug.

[0009] In one or more embodiments of this utility model, the upstream pressure sensor and the downstream pressure sensor are disposed on the same surface of the first main body; the flow detection module further includes a sensor fixing member disposed on the first main body, the sensor fixing member including a limiting part that abuts against the upstream pressure sensor and the downstream pressure sensor on the side away from the first main body.

[0010] In one or more embodiments of this utility model, a first limiting groove and a second limiting groove are provided on the side of the limiting part facing the first main body, a portion of the upstream pressure sensor is accommodated in the first limiting groove, and a portion of the downstream pressure sensor is accommodated in the second limiting groove.

[0011] In one or more embodiments of this utility model, the first main body further includes a temperature measuring channel connected to the first fluid channel, and the flow detection module further includes a temperature sensor disposed in the temperature measuring channel and an electrically controlled valve disposed on the outer surface of the first main body. The electrically controlled valve is connected to the upstream end of the first fluid channel. The flow detection module further includes a control unit that is electrically connected to the upstream pressure sensor, the downstream pressure sensor, the temperature sensor and the electrically controlled valve. The control unit is used to control the opening degree of the electrically controlled valve based on the detection data of the upstream pressure sensor, the downstream pressure sensor and the temperature sensor.

[0012] In one or more embodiments of this utility model, the flow detection module further includes an electrically controlled valve, the output end of which is connected to the upstream end of the first fluid channel; the fluid metering and filling device further includes a pressure regulating module connected to the input end of the electrically controlled valve, the pressure regulating module being used to regulate the fluid pressure delivered to the first fluid channel.

[0013] In one or more embodiments of this utility model, the pressure regulating module includes a second main body and a pressure regulating valve disposed on the second main body. The second main body has a pressure regulating input channel connected to the input end of the pressure regulating valve and a pressure regulating output channel connected to the output end of the pressure regulating valve. The pressure regulating output channel is also connected to the input end of the electrically controlled valve.

[0014] In one or more embodiments of this utility model, a pressure measuring channel is formed inside the second main body, which is connected to the pressure regulating output channel and extends to the outer surface of the second main body; in the pressure measuring state, the pressure measuring channel is used to connect to a pressure testing device; in the pressure regulating state, a plug is installed inside the pressure measuring channel.

[0015] In one or more embodiments of this utility model, the fluid metering and filling device further includes a main control module electrically connected to the control unit. The main control module is used to set the target flow rate of the fluid in the first fluid channel and send the target flow rate to the control unit.

[0016] In one or more embodiments of this utility model, the control unit includes a main control circuit board and an expansion circuit board disposed opposite to each other in a direction perpendicular to the axial direction of the first fluid channel; multiple flow detection modules are provided and arranged in a direction perpendicular to the main control circuit board and the expansion circuit board, and the main control circuit board of one of two adjacent flow detection modules is electrically connected to the expansion circuit board of the other.

[0017] In one or more embodiments of this utility model, the first main body parts of two adjacent flow detection modules are connected by connecting bolts.

[0018] In one or more embodiments of the present invention, the fluid metering and dispensing device further includes a terminal module electrically connected to the control unit, the terminal module being used to provide a 120Ω terminating resistor.

[0019] Compared with existing technologies, the flow detection module of this invention features a removable throttle plug to change the fluid pressure between the upstream and downstream sides, and calculates the corresponding fluid flow rate based on the pressure difference between the upstream and downstream sides. The mounting hole of the throttle plug can be used with an external torque application tool to tighten the throttle plug, facilitating the installation, removal, and replacement of the throttle plug, thus improving the versatility and expandability of the flow detection module. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of the fluid metering and dispensing device in one embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of the flow detection module and the voltage regulation module in one embodiment of the present invention;

[0023] Figure 3 This is another cross-sectional view of the flow detection module and the voltage regulation module in one embodiment of the present invention;

[0024] Figure 4 This is a cross-sectional view of a partial area of ​​the flow detection module in one embodiment of the present invention;

[0025] Figure 5 This is an exploded view of a partial area of ​​the flow detection module in one embodiment of the present invention;

[0026] Figure 6 This is an exploded structural diagram of the upstream pressure sensor, the downstream pressure sensor, and the sensor fixing component in one embodiment of the present invention;

[0027] Figure 7 This is a three-dimensional structural diagram of the throttle plug in one embodiment of the present invention;

[0028] Figure 8 This is a three-dimensional structural view of the flow detection module and the voltage regulation module in one embodiment of the present invention from a certain perspective;

[0029] Figure 9 This is a three-dimensional structural diagram of the flow detection module and the voltage regulation module in one embodiment of the present invention from another perspective;

[0030] Figure 10 This is a cross-sectional view of the flow detection module and the main control module in one embodiment of the present invention from another perspective.

[0031] Key reference numerals: 1. Flow detection module; 11. First main body; 111. First fluid channel; 112. Upstream pressure acquisition channel; 113. Downstream pressure acquisition channel; 114. Second fluid channel; 115. Temperature measurement channel; 116. Screw hole; 12. Throttling plug; 121. Mounting hole; 122. Throttling orifice; 13. Upstream pressure sensor; 14. Downstream pressure sensor; 15. Sensor fixing component; 151. Limiting part; 1511. First limiting groove; 1 512. Second limiting groove; 152. Connecting part; 16. Temperature sensor; 17. Electric control valve; 18. Main control circuit board; 181. Output interface; 19. Expansion circuit board; 191. Input interface; 110. Protective shell; 2. Pressure regulating module; 21. Second main body; 211. Pressure regulating input channel; 212. Pressure regulating output channel; 213. Pressure measuring channel; 214. Plug; 22. Pressure regulating valve; 3. Main control module; 4. Terminal module; 5. Connecting rivet; 6. Set screw. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0033] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "second" and "first" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "second" or "first" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In one embodiment, reference is made to Figure 1 As shown, this utility model provides a fluid metering and filling device, which includes a flow detection module 1, a pressure regulating module 2, a main control module 3, and a terminal module 4.

[0036] Flow detection module 1 is used to transport fluid. It detects parameters such as internal fluid pressure and temperature, and calculates the fluid flow rate based on these parameters. Pressure regulating module 2 is connected to flow detection module 1 and the fluid supply source. Located upstream of flow detection module 1, pressure regulating module 2 adjusts the fluid pressure supplied from the fluid supply source to flow detection module 1. Main control module 3 is electrically connected to flow detection module 1. It sets the target flow rate of the fluid within flow detection module 1 and sends this target flow rate as an electrical signal to flow detection module 1. Flow detection module 1 adjusts its internal fluid flow rate to the target flow rate based on the received electrical signal. Terminal module 4 is connected to the signal output terminal of flow detection module 1. Terminal module 4 provides a 120Ω terminating resistor for CAN communication, achieving impedance matching, eliminating signal reflection, and improving CAN communication stability.

[0037] The structure of the flow detection module 1 will be further described below.

[0038] In one embodiment, reference is made to Figure 2 , Figure 4 , Figure 5 and Figure 7 As shown, the flow detection module 1 includes a first main body 11, a throttle plug 12, an upstream pressure sensor 13, and a downstream pressure sensor 14.

[0039] The first main body 11 is generally constructed as a cubic metal block. A first fluid channel 111 is formed inside the first main body 11. The first fluid channel 111 extends in a straight line and both ends of it penetrate to the outer surface of the corresponding position of the first main body 11.

[0040] The throttle plug 12 is threaded into the first fluid channel 111. The interior of the throttle plug 12 has an axially arranged mounting hole 121 and a throttle orifice 122, the diameter of which is smaller than that of the mounting hole 121. The throttle orifice 122 reduces the cross-sectional area of ​​the first fluid channel 111, causing the fluid to accelerate at the throttle orifice 122 and reducing the fluid pressure downstream of the orifice, thus creating a pressure difference between the fluid upstream and downstream of the throttle plug 12. In a plane perpendicular to the axial direction of the throttle plug 12, the vertical projection of the mounting hole 121 is polygonal. The mounting hole 121 can be used with an external torque-applying tool to tighten the throttle plug 12, facilitating its installation, removal, and replacement.

[0041] The orifice diameter of the throttling plug 12 can be adaptively adjusted according to actual needs. Therefore, when meeting the needs of different users, it is only necessary to select the throttling plug 12 with the corresponding orifice diameter. There is no need to adjust the internal channel structure of the first main body 11, which improves the versatility and expandability of the flow detection module 1.

[0042] Preferably, the mounting hole 121 can be configured as an internal hexagonal hole. On a plane perpendicular to the axial direction of the throttle plug 12, the shape of the vertical projection of the mounting hole 121 is a regular hexagon.

[0043] An upstream pressure sensor 13 and a downstream pressure sensor 14 are disposed on the outer surface of the first main body 11. Inside the first main body 11, an upstream pressure acquisition channel 112 and a downstream pressure acquisition channel 113 are also formed, communicating with different parts of the first fluid channel 111. Both the upstream pressure acquisition channel 112 and the downstream pressure acquisition channel 113 extend in a straight line through the corresponding positions on the outer surface of the first main body 11. The upstream pressure acquisition channel 112 is located upstream of the throttle plug 12 and is also connected to the detection port of the upstream pressure sensor 13, so that the upstream pressure sensor 13 can detect the fluid pressure upstream of the throttle plug 12. The downstream pressure acquisition channel 113 is located downstream of the throttle plug 12 and is also connected to the detection port of the downstream pressure sensor 14, so that the downstream pressure sensor 14 can detect the fluid pressure downstream of the throttle plug 12.

[0044] Furthermore, the flow detection module 1 also includes a control unit, which includes a main control circuit board 18. The main control circuit board 18 integrates two pressure acquisition circuits electrically connected to the upstream pressure sensor 13 and the downstream pressure sensor 14. After the control unit acquires the fluid pressure upstream and downstream of the throttle plug 12, it calculates the corresponding fluid flow rate according to a built-in algorithm. The built-in algorithm is based on Bernoulli's equation and continuity equation in fluid mechanics, and derives the fluid flow rate by measuring the fluid pressure difference before and after the throttle plug 12. The specific calculation method is readily known to those skilled in the art and will not be described in detail in this invention.

[0045] Considering that the diameter of the mounting hole 121 is relatively large, when the mounting hole 121 is located downstream of the throttling hole 122, it will reduce the fluid flow rate and increase the fluid pressure detected by the downstream pressure sensor 14.

[0046] To address the above problems, in one embodiment, reference is made to... Figure 4 and Figure 5 As shown, the throttling orifice 122 is located on the side of the mounting hole 121 near the downstream pressure acquisition channel 113. The throttling orifice 122 is relatively close to the downstream pressure acquisition channel 113, while the mounting hole 121 is relatively close to the upstream pressure acquisition channel 112. The diameter of the mounting hole 121 is relatively large, so it has little impact on the fluid velocity and fluid pressure upstream of the throttling plug 12, and the resulting detection error is also relatively small, or even negligible.

[0047] Furthermore, the upstream pressure acquisition channel 112 is perpendicular to the first fluid channel 111. In order to make the upstream end of the downstream pressure acquisition channel 113 as close as possible to the throttle orifice 122 of the throttle plug 12 and reduce the detection error of the downstream pressure sensor 14, the downstream pressure acquisition channel 113 is set as an inclined channel. The downstream pressure acquisition channel 113 is set to satisfy the following: in the axial direction of the first fluid channel 111, the distance between the upstream end of the downstream pressure acquisition channel 113 and the throttle plug 12 is less than the distance between its downstream end and the throttle plug 12.

[0048] In one embodiment, reference is made to Figures 4 to 6 As shown, the upstream pressure sensor 13 and the downstream pressure sensor 14 are disposed on the same surface of the first main body 11. The flow detection module 1 also includes a sensor fixing member 15 disposed on the first main body 11. The sensor fixing member 15 includes two connecting parts 152 and a limiting part 151. The two connecting parts 152 are fixed to the first main body 11 by bolts. The limiting part 151 is connected to the two connecting parts 152 and abuts against the side of the upstream pressure sensor 13 and the downstream pressure sensor 14 away from the first main body 11, thereby fixing the upstream pressure sensor 13 and the downstream pressure sensor 14 to the outer surface of the first main body 11.

[0049] Furthermore, in order to improve the fixing effect of the sensor fixing member 15 on the upstream pressure sensor 13 and the downstream pressure sensor 14 and reduce the probability of the upstream pressure sensor 13 and the downstream pressure sensor 14 becoming loose during use, the limiting part 151 is provided with a first limiting groove 1511 and a second limiting groove 1512 on the side facing the first main body part 11. A part of the upstream pressure sensor 13 is accommodated in the first limiting groove 1511, and a part of the downstream pressure sensor 14 is accommodated in the second limiting groove 1512.

[0050] Considering that temperature affects fluid density, in order to improve the accuracy of the calculation, the calculated flow rate value needs to be corrected based on the fluid temperature when calculating the fluid flow rate in the first fluid channel 111.

[0051] To address the above problems, in one embodiment, reference is made to... Figure 2 , Figure 3 and Figure 9 As shown, the first main body 11 also includes a temperature measuring channel 115 connected to the first fluid channel 111, and the flow detection module 1 also includes a temperature sensor 16 disposed in the temperature measuring channel 115. The temperature sensor 16 is electrically connected to the control unit. The temperature sensor 16 can detect the fluid temperature in the flow detection module 1 and transmit the detection data to the control unit. The control unit calculates a more accurate fluid flow rate based on the received fluid pressure data and fluid temperature data.

[0052] In one embodiment, reference is made to Figure 2 , Figure 8 and Figure 9 As shown, the flow detection module 1 also includes an electrically controlled valve 17 disposed on the outer surface of the first main body 11. The electrically controlled valve 17, the upstream pressure sensor 13, and the downstream pressure sensor 14 are all disposed on the same outer surface of the first main body 11. The electrically controlled valve 17 is electrically connected to the control unit, and the internal channel of the electrically controlled valve 17 is connected to the upstream end of the first fluid channel 111. The control unit is used to control the opening degree of the electrically controlled valve 17 based on the detection data of the upstream pressure sensor 13, the downstream pressure sensor 14, and the temperature sensor 16, thereby adjusting the fluid flow rate in the first fluid channel 111 so that the fluid flow rate in the first fluid channel 111 reaches the target flow rate.

[0053] Furthermore, the electrically controlled valve 17 includes, but is not limited to, a proportional solenoid valve.

[0054] In one embodiment, reference is made to Figure 2 , Figure 8 and Figure 9 As shown, the control unit of the flow detection module 1 includes a main control circuit board 18 and an expansion circuit board 19 electrically connected. The main control circuit board 18 and the expansion circuit board 19 are generally parallel to the first fluid channel 111 and are also arranged opposite each other in a direction perpendicular to the axial direction of the first fluid channel 111. The main control circuit board 18 integrates a pressure acquisition circuit, a temperature acquisition circuit, and an opening adjustment circuit. The main control circuit board 18 is provided with an output interface 181, and the expansion circuit board 19 is provided with an input interface 191 to facilitate the connection of the flow detection module 1 with other expansion modules.

[0055] Furthermore, the flow detection module 1 is provided in multiple ways, and the multiple flow detection modules 1 are arranged in a direction perpendicular to the main control circuit board 18 and the expansion circuit board 19. The main control circuit board 18 of one of two adjacent flow detection modules 1 is electrically connected to the expansion circuit board 19 of the other one.

[0056] Furthermore, the first main body 11 of two adjacent flow detection modules 1 are connected by connecting bolts 5. A screw hole 116 is formed in the first main body 11, and a set screw 6 that cooperates with the connecting bolt 5 is provided in the screw hole 116.

[0057] Specifically, the two ends of the connecting rivet 5 are respectively inserted into two adjacent flow detection modules 1, and the set screw 6 is approximately perpendicular to the connecting rivet 5 and serves as a locking element. When the set screw 6 is tightened, the tip of the set screw 6 can press against the inner hole of the connecting rivet 5 or the matching component to lock the position of the connecting rivet 5 and prevent the connecting rivet 5 from loosening.

[0058] In one embodiment, reference is made to Figures 1 to 3As shown, the flow detection module 1 also includes a protective shell 110 disposed on the first main body 11, and the upstream pressure sensor 13, the downstream pressure sensor 14, the electric control valve 17, the main control circuit board 18 and the expansion circuit board 19 are all located inside the protective shell 110.

[0059] The structure of voltage regulating module 2 will be further described below.

[0060] In one embodiment, reference is made to Figure 2 and Figure 3 As shown, the pressure regulating module 2 is connected to the input terminal of the solenoid valve 17. The pressure regulating module 2 is used to regulate the fluid pressure delivered to the first fluid channel 111. The pressure regulating module 2 includes a second main body 21 and a pressure regulating valve 22 disposed on the second main body 21. The second main body 21 is disposed adjacent to the first main body 11 and is fixed to the first main body 11 by bolts. A pressure regulating input channel 211 and a pressure regulating output channel 212 are formed within the second main body 21. The pressure regulating input channel 211 is connected to the fluid supply source and the input terminal of the pressure regulating valve 22, respectively. The pressure regulating output channel 212 is connected to the output terminal of the pressure regulating valve 22 and the input terminal of the solenoid valve 17, respectively.

[0061] Furthermore, a second fluid channel 114 is also formed inside the first main body 11. The second fluid channel 114 is connected to the input end of the electric control valve 17 and the pressure regulating output channel 212. The first fluid channel 111 and the second fluid channel 114 are spaced apart in a direction perpendicular to the fluid flow direction.

[0062] In one embodiment, reference is made to Figure 3 As shown, a pressure measuring channel 213 is formed within the second main body 21, communicating with the pressure regulating output channel 212 and extending to the outer surface of the second main body 21. In the pressure measuring state, the pressure measuring channel 213 is used to connect to a pressure testing device to detect the fluid pressure within the pressure regulating output channel 212. In the pressure regulating state, a plug 214 is installed within the pressure measuring channel 213 to seal it, preventing fluid from flowing out of the pressure measuring channel 213 to the outside of the second main body 21.

[0063] In one embodiment, reference is made to Figure 1 As shown, there are multiple pressure regulating modules 2, and each pressure regulating module 2 is connected to a corresponding flow detection module 1. The pressure regulating output channel 212 in the pressure regulating module 2 is connected to the second fluid channel 114 in the flow detection module 1.

[0064] The following section provides a further description of the structure of the main control module 3 and the terminal module 4.

[0065] In one embodiment, reference is made to Figure 1 and Figure 10As shown, multiple flow detection modules 1 are located between the main control module 3 and the terminal module 4. The connection method between the main control module 3 and its adjacent flow detection module 1 is the same as the connection method between two adjacent flow detection modules 1. The circuit board inside the main control module 3 is electrically connected to the expansion circuit board 19 of its adjacent flow detection module 1, and the terminal module 4 is electrically connected to the main control circuit board 18 of its adjacent flow detection module 1, and is fixed to the adjacent first main body 11 by bolts and other components.

[0066] Additionally, it should be noted that in the above embodiments, the first fluid channel 111 penetrates the first main body 11 to facilitate the installation, disassembly, and replacement of the throttle plug 12. After the throttle plug 12 is installed inside the first fluid channel 111, a sealing component can be installed at the end of the first fluid channel 111 near the pressure regulating module 2 to seal the first fluid channel 111 and prevent fluid leakage at the end of the first fluid channel 111 near the pressure regulating module 2.

[0067] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0068] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A fluid metering and dispensing device, characterized in that, The fluid metering and dispensing device includes a flow detection module (1), which comprises: The first main body (11) includes a first fluid channel (111), and an upstream pressure acquisition channel (112) and a downstream pressure acquisition channel (113) respectively connected to the first fluid channel (111); A throttle plug (12) is threaded into the first fluid channel (111) and located between the upstream pressure acquisition channel (112) and the downstream pressure acquisition channel (113). The throttle plug (12) includes a mounting hole (121) and a throttle hole (122) arranged along its axial direction. The diameter of the throttle hole (122) is smaller than the diameter of the mounting hole (121). On a plane perpendicular to the axial direction of the throttle plug (12), the vertical projection of the mounting hole (121) is polygonal. An upstream pressure sensor (13) is used to detect the fluid pressure in the upstream pressure acquisition channel (112); Downstream pressure sensor (14) is used to detect fluid pressure in the downstream pressure acquisition channel (113).

2. The fluid metering and dispensing device according to claim 1, characterized in that, The throttling orifice (122) is located on the side of the mounting hole (121) near the downstream pressure acquisition channel (113).

3. The fluid metering and dispensing device according to claim 2, characterized in that, In the axial direction of the first fluid channel (111), the distance between the upstream end of the downstream pressure acquisition channel (113) and the throttle plug (12) is less than the distance between its downstream end and the throttle plug (12).

4. The fluid metering and dispensing device according to claim 1, characterized in that, The upstream pressure sensor (13) and the downstream pressure sensor (14) are disposed on the same surface of the first main body (11); The flow detection module (1) further includes a sensor fixing member (15) disposed on the first main body (11), the sensor fixing member (15) including a limiting part (151) abutting against the upstream pressure sensor (13) and the downstream pressure sensor (14) on the side away from the first main body (11).

5. The fluid metering and dispensing device according to claim 4, characterized in that, The limiting part (151) has a first limiting groove (1511) and a second limiting groove (1512) on the side facing the first main body part (11). A portion of the upstream pressure sensor (13) is housed in the first limiting groove (1511), and a portion of the downstream pressure sensor (14) is housed in the second limiting groove (1512).

6. The fluid metering and dispensing device according to claim 1, characterized in that, The first main body (11) also includes a temperature measuring channel (115) connected to the first fluid channel (111). The flow detection module (1) also includes a temperature sensor (16) disposed in the temperature measuring channel (115) and an electric control valve (17) disposed on the outer surface of the first main body (11). The electric control valve (17) is connected to the upstream end of the first fluid channel (111). The flow detection module (1) also includes a control unit that is electrically connected to the upstream pressure sensor (13), the downstream pressure sensor (14), the temperature sensor (16) and the solenoid valve (17). The control unit is used to control the opening degree of the solenoid valve (17) based on the detection data of the upstream pressure sensor (13), the downstream pressure sensor (14) and the temperature sensor (16).

7. The fluid metering and dispensing device according to claim 1, characterized in that, The flow detection module (1) also includes an electrically controlled valve (17), the output end of which is connected to the upstream end of the first fluid channel (111); The fluid metering and filling device also includes a pressure regulating module (2) connected to the input end of the electric control valve (17), which is used to regulate the fluid pressure delivered to the first fluid channel (111).

8. The fluid metering and dispensing device according to claim 7, characterized in that, The pressure regulating module (2) includes a second main body (21) and a pressure regulating valve (22) disposed on the second main body (21). The second main body (21) has a pressure regulating input channel (211) connected to the input end of the pressure regulating valve (22) and a pressure regulating output channel (212) connected to the output end of the pressure regulating valve (22). The pressure regulating output channel (212) is also connected to the input end of the electric control valve (17).

9. The fluid metering and dispensing device according to claim 8, characterized in that, The second main body (21) has a pressure measuring channel (213) that is connected to the voltage regulating output channel (212) and extends to the outer surface of the second main body (21); In the pressure testing state, the pressure testing channel (213) is used to connect to the pressure testing equipment; In the pressure regulating state, the pressure measuring channel (213) is used to install the plug (214).

10. The fluid metering and dispensing device according to claim 6, characterized in that, The fluid metering and filling device also includes a main control module (3) electrically connected to the control unit. The main control module (3) is used to set the target flow rate of the fluid in the first fluid channel (111) and send the target flow rate to the control unit.

11. The fluid metering and dispensing device according to claim 6, characterized in that, The control unit includes a main control circuit board (18) and an expansion circuit board (19) arranged opposite each other along a direction perpendicular to the axial direction of the first fluid channel (111); The flow detection module (1) is provided in multiple ways and is arranged in a direction perpendicular to the main control circuit board (18) and the expansion circuit board (19). The main control circuit board (18) of one of the two adjacent flow detection modules (1) is electrically connected to the expansion circuit board (19) of the other.

12. The fluid metering and dispensing device according to claim 11, characterized in that, The first main body (11) of two adjacent flow detection modules (1) are connected by connecting bolts (5).

13. The fluid metering and dispensing device according to claim 10, characterized in that, The fluid metering and dispensing device also includes a terminal module (4) electrically connected to the control unit, the terminal module (4) being used to provide a 120Ω terminal resistor.

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