Hall effect flow meters and infusion equipment

Abstract

This utility model discloses a Hall effect flow meter and infusion device, relating to the technical field of flow measurement equipment. The Hall effect flow meter includes a main body, a guide tube, a mounting frame, an impeller, and a circuit board. The guide tube is disposed on the main body and has an infusion channel. The mounting frame is disposed on the main body, passing through the guide tube and exposed to the infusion channel. The impeller is rotatably mounted on the mounting frame and located within the infusion channel. The axis of rotation of the impeller forms an angle with the central axis of the guide tube. The impeller is a magnetic injection-molded part. The circuit board is disposed on the mounting frame and has a Hall effect sensor corresponding to the impeller. The Hall effect sensor is used to sense changes in the magnetic field generated when the impeller rotates. The technical solution provided by this utility model can solve the technical problems of insufficient reliability and high assembly difficulty of existing Hall effect flow meters.

Description

Technical Field

[0001] This utility model relates to the field of flow measurement equipment technology, and in particular to a Hall flow meter and infusion equipment. Background Technology

[0002] A Hall effect flow meter is a fluid measurement device based on the Hall effect principle. It primarily works by periodically sensing changes in a magnetic field to generate pulse signals, which are then used to calculate the flow rate. However, traditional Hall effect flow meters suffer from technical problems such as insufficient reliability and high assembly difficulty.

[0003] Therefore, it is necessary to provide a new Hall effect flow meter and infusion device to solve the above-mentioned technical problems. Utility Model Content

[0004] The main purpose of this utility model is to provide a Hall flow meter and infusion device, which aims to solve the technical problems of insufficient reliability and difficult assembly of Hall flow meters.

[0005] To achieve the above objectives, this utility model proposes a Hall effect flow meter, comprising:

[0006] main body;

[0007] A flow guide tube is disposed on the main body and has an infusion channel;

[0008] A fixing frame is disposed on the main body, the fixing frame passes through the guide tube and is exposed to the infusion channel;

[0009] An impeller is rotatably mounted on a fixed frame and located within the infusion channel. The axis of rotation of the impeller forms an angle with the central axis of the guide tube. The impeller is a magnetic injection-molded part.

[0010] A circuit board is mounted on the mounting bracket. The circuit board is equipped with a Hall sensor corresponding to the impeller. The Hall sensor is used to sense the changes in the magnetic field generated when the impeller rotates.

[0011] In one embodiment, the impeller includes an integrally injection-molded shaft and at least three blades, the shaft being rotatably connected to the fixed frame, and all the blades being evenly spaced around the shaft in a circumferential direction.

[0012] In one embodiment, the number of blades is four, and the four blades are evenly spaced around the axis of rotation.

[0013] In one embodiment, the fixing frame includes a fixing block and two mounting posts symmetrically arranged on the fixing block. Both mounting posts pass through the guide tube and are exposed to the infusion channel. Each of the two mounting posts has a groove on one side facing each other. The two ends of the rotating shaft are rotatably disposed in the two grooves respectively.

[0014] In one embodiment, the mounting bracket is provided with a receiving groove, in which the Hall sensor is received.

[0015] In one embodiment, the infusion channel includes a first delivery channel, a connecting channel, and a second delivery channel connected in sequence. The fixture passes through the guide tube and is exposed to the first delivery channel. The cross-sectional dimensions of the first delivery channel and the second delivery channel are both larger than the cross-sectional dimensions of the connecting channel.

[0016] In one embodiment, the main body is provided with at least two positioning posts, the fixing frame is provided with at least two first positioning holes, and the circuit board is provided with at least two second positioning holes. The number of positioning posts, first positioning holes, and second positioning holes are equal and they are arranged in a one-to-one correspondence. Each positioning post passes through the corresponding first positioning hole and the corresponding second positioning hole. The fixing frame and the circuit board are riveted to the outer shell through the positioning posts.

[0017] In one embodiment, the main body is provided with a mounting groove, and both the fixing frame and the circuit board are disposed in the mounting groove, which is filled with a sealing element.

[0018] In one embodiment, the fixing bracket is an injection-molded part; or,

[0019] The main body and the guide tube are integrally formed.

[0020] In addition, this utility model also proposes an infusion device, which includes a Hall flow meter as described above.

[0021] This invention simplifies the structure of the Hall effect flowmeter by using a magnetic impeller injection-molded from a mixture of plastic and magnetic materials, reducing assembly difficulty and improving reliability. In this embodiment, the impeller is a magnetic injection-molded part made from a mixture of plastic and magnetic materials. During assembly, there is no need to attach magnets or other magnetic components to the impeller via bonding or mechanical fixing, thus reducing assembly difficulty. Furthermore, it improves reliability; specifically, when high-speed liquid impacts the impeller, the injection-molded impeller will not lose its magnetism due to magnets or other magnetic components detaching, preventing disruption of normal operation. The infusion channel is used to transport the liquid. The mounting bracket is used to install the impeller and provide support; the bracket is installed on the main body, passes through the guide tube, and is exposed in the infusion channel to support the impeller installation, further reducing assembly difficulty. The Hall sensor detects changes in the magnetic field generated when the impeller rotates, thus producing a pulse signal. An external signal processing system then acquires this pulse signal and calculates the flow rate based on it. This Hall flow meter is used in flow detection equipment and other technical fields. Attached Figure Description

[0022] 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 of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the Hall flow meter in one embodiment of the present invention;

[0024] Figure 2 for Figure 1 Cross-sectional view;

[0025] Figure 3 A schematic diagram showing the connection between the fixing frame and the impeller in one embodiment of this utility model.

[0026] Explanation of icon numbers:

[0027] 100. Main body; 110. Positioning post; 200. Guide tube; 210. Infusion channel; 211. First delivery channel; 212. Connecting channel; 213. Second delivery channel; 300. Fixing frame; 310. Fixing block; 320. Mounting post; 321. Groove; 330. Receiving groove; 340. First mounting hole; 400. Impeller; 410. Rotating shaft; 420. Blade; 500. Circuit board; 510. Hall sensor.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0032] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] A Hall effect flow meter is a fluid measurement device based on the Hall effect principle. It primarily works by periodically sensing changes in a magnetic field to generate pulse signals, which are then used to calculate the flow rate. In actual production and manufacturing, researchers have found that traditional Hall effect flow meters typically employ a split impeller design, meaning the impeller and magnetic components must be manufactured separately and assembled using bonding, embedding, or mechanical fixing methods. However, this assembly method significantly increases the difficulty of assembling the Hall effect flow meter. Furthermore, during actual use, the magnetic components are highly likely to detach from the impeller due to the impact of high-speed liquid, affecting the reliability of the Hall effect flow meter.

[0034] This utility model proposes a Hall flow meter and infusion device, aiming to solve the technical problems of insufficient reliability and high assembly difficulty of Hall flow meters.

[0035] Please see Figures 1 to 3 In one embodiment of this utility model, the Hall flow meter includes a main body 100, a guide pipe 200, a fixing frame 300, an impeller 400, and a circuit board 500. The guide pipe 200 is disposed on the main body 100 and has an infusion channel 210. The fixing frame 300 is disposed on the main body 100, passes through the guide pipe 200, and is exposed to the infusion channel 210. The impeller 400 is rotatably disposed on the fixing frame 300 and located in the infusion channel 210. The rotation axis of the impeller 400 is set at an angle to the central axis of the guide pipe 200. The impeller 400 is a magnetic injection molded part. The circuit board 500 is disposed on the fixing frame 300 and has a Hall sensor 510 corresponding to the impeller 400. The Hall sensor 510 is used to sense the change in magnetic field generated when the impeller 400 rotates. In one specific embodiment, the rotation axis of the impeller 400 is perpendicular to the central axis of the guide tube 200, and the main body 100 and the guide tube 200 are integrally formed.

[0036] The technical solution of this utility model simplifies the structure of the Hall flow meter, reduces the assembly difficulty, and improves the reliability of the Hall flow meter by using a magnetic impeller 400, which is injection molded from a mixture of plastic and magnetic materials. In this embodiment, the impeller 400 is a magnetic injection molded part made from a mixture of plastic and magnetic materials. During the assembly of the Hall flow meter, it is unnecessary to install magnets or other magnetic components on the impeller 400 through bonding, mechanical fixing, or other methods, thus reducing the assembly difficulty. Simultaneously, it also improves the reliability of the Hall flow meter; specifically, when high-speed liquid impacts the impeller 400, the injection-molded impeller 400 will not lose its magnetism due to the detachment of magnetic components such as magnets, thus preventing the Hall flow meter from operating normally. The infusion channel 210 is used to transport liquid. The mounting bracket 300 is used to mount the impeller 400, providing support for it. Mounting the bracket 300 to the main body 100 and extending it through the guide pipe 200 and exposing it to the infusion channel 210, while supporting the impeller 400, reduces the assembly difficulty of the Hall flow meter. The Hall sensor 510 senses the change in the magnetic field generated when the impeller 400 rotates, thus generating a pulse signal. Finally, an external signal processing system can acquire the pulse signal generated by the Hall sensor 510 and calculate the flow rate based on it. This Hall flow meter is applied in technical fields such as flow detection equipment.

[0037] It should be noted that when injection molding the impeller 400, operators can select different ratios of plastic and magnetic materials according to actual needs. For example, to meet the strength requirements of high magnetic fields, the impeller 400 can use 70%-90% magnetic material, with the remaining proportion being a mixture of plastic materials for injection molding. To adapt to corrosive environments and reduce production costs, the impeller 400 can use 60%-80% magnetic material, with the remaining proportion being a mixture of plastic materials for injection molding. And to adapt to high-temperature environments, the impeller 400 can use 65%-85% magnetic material, with the remaining proportion being a mixture of plastic materials for injection molding.

[0038] In one embodiment of this utility model, the impeller 400 includes an integrally injection-molded rotating shaft 410 and at least three blades 420. The rotating shaft 410 is rotatably connected to the fixed frame 300, and all the blades 420 are evenly spaced circumferentially around the rotating shaft 410. In this embodiment, the number of blades 420 in the impeller 400 is designed to be at least three. This can improve the stability of the impeller 400 during rotation to meet the dynamic balance requirements of the Hall flowmeter, and also make the magnetic field changes generated by the impeller 400 during rotation more regular, thereby improving the accuracy of the detection data. In a specific embodiment, the number of blades 420 is four, and the four blades 420 are evenly spaced circumferentially around the rotating shaft 410. The polarities of any two blades 420 arranged opposite each other are opposite.

[0039] In one embodiment of this utility model, the fixing frame 300 includes a fixing block 310 and two mounting posts 320 symmetrically arranged on the fixing block 310. Both mounting posts 320 pass through the guide tube 200 and are exposed in the infusion channel 210. Each of the two mounting posts 320 has a groove 321 on its facing side. The two ends of the rotating shaft 410 are rotatably disposed in the two grooves 321. In this embodiment, by rotatably mounting the two ends of the impeller 400 in the grooves 321 of the two spaced-apart mounting posts 320, the stability of the impeller 400 during rotation can be ensured. In a specific embodiment, the fixing frame 300 is an injection-molded part, and the fixing block 310 is also exposed in the infusion channel 210.

[0040] In one embodiment of this utility model, the fixing frame 300 is provided with a receiving groove 330, in which the Hall sensor 510 is received. In this embodiment, by providing a receiving groove 330 on the fixing frame 300 so that the Hall sensor 510 is received, it is possible to avoid contact between the fixing frame 300 and the Hall sensor 510, ensuring the normal operation of the Hall sensor 510, and also to reduce the size of the Hall flow meter.

[0041] In one embodiment of this utility model, the infusion channel 210 includes a first delivery channel 211, a connecting channel 212, and a second delivery channel 213 connected in sequence. The fixing bracket 300 passes through the guide tube 200 and is exposed to the first delivery channel 211. The cross-sectional dimensions of the first delivery channel 211 and the second delivery channel 213 are both larger than the cross-sectional dimension of the connecting channel 212. In this embodiment, by setting a connecting channel 212 with a smaller cross-sectional dimension to connect the first delivery channel 211 and the second delivery channel 213, the flow rate of the liquid in the Hall flowmeter can be increased to ensure the accuracy of the detection data. In a specific embodiment, the cross-sections of the first delivery channel 211, the connecting channel 212, and the second delivery channel 213 are all circular, and the diameter of the first delivery channel 211 is equal to the diameter of the second delivery channel 213, while the diameter of the first delivery channel 211 is larger than the diameter of the connecting channel 212.

[0042] In one embodiment of this utility model, the main body 100 is provided with at least two positioning posts 110, the fixing frame 300 is provided with at least two first positioning holes 340, and the circuit board 500 is provided with at least two second positioning holes. The number of positioning posts 110, first positioning holes 340, and second positioning holes are equal and correspondingly arranged. Each positioning post 110 passes through the corresponding first positioning hole 340 and the corresponding second positioning hole. The fixing frame 300 and the circuit board 500 are riveted to the main body 100 through the positioning posts 110. In this embodiment, by passing each positioning post 110 through the corresponding first positioning hole 340 and the corresponding second positioning hole, the fixing frame 300 and the circuit board 500 can be positioned during installation to ensure accurate installation of the fixing frame 300 and the circuit board 500. Using positioning posts 110 to rivet the fixing frame 300 and the circuit board 500 to the main body 100 has the characteristics of simple structure and can reduce the assembly difficulty of the Hall flow meter. In one specific embodiment, the mounting bracket 300 and the circuit board 500 can be connected to the main body 100 by hot pressing or hot mortising.

[0043] In one embodiment of this utility model, the main body 100 is provided with a mounting groove, and both the fixing bracket 300 and the circuit board 500 are disposed in the mounting groove, which is filled with a sealing element. In this embodiment, by filling the mounting grooves of the fixing bracket 300 and the circuit board 500 with a sealing element, the Hall flow meter can be sealed to ensure its normal operation. In a specific embodiment, the sealing element can be a sealant, waterproof adhesive, etc.

[0044] This utility model also proposes an infusion device, which includes a Hall flow meter. The specific structure of the Hall flow meter is as described in the above embodiments. Since the infusion device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0045] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A Hall flowmeter characterized by, include: main body; A flow guide tube is disposed on the main body and has an infusion channel; A fixing frame is disposed on the main body, the fixing frame passes through the guide tube and is exposed to the infusion channel; An impeller is rotatably mounted on a fixed frame and located within the infusion channel. The axis of rotation of the impeller forms an angle with the central axis of the guide tube. The impeller is a magnetic injection-molded part. A circuit board is mounted on the mounting bracket. The circuit board is equipped with a Hall sensor corresponding to the impeller. The Hall sensor is used to sense the changes in the magnetic field generated when the impeller rotates.

2. The Hall flow meter of claim 1, wherein, The impeller includes an integrally injection-molded shaft and at least three blades. The shaft is rotatably connected to the fixed frame, and all the blades are evenly spaced around the shaft in a circumferential direction.

3. The Hall flow meter defined in claim 2 wherein The number of blades is four, and the four blades are evenly spaced around the axis of rotation.

4. The Hall flow meter defined in claim 2 wherein The fixing frame includes a fixing block and two mounting columns symmetrically arranged on the fixing block. Both mounting columns pass through the guide tube and are exposed to the infusion channel. Each of the two mounting columns has a groove on one side facing each other. The two ends of the rotating shaft are rotatably disposed in the two grooves respectively.

5. The Hall flow meter defined in claim 1 wherein The mounting bracket is provided with a receiving groove, and the Hall sensor is housed in the receiving groove.

6. The Hall flow meter of claim 1, wherein, The infusion channel includes a first delivery channel, a connecting channel, and a second delivery channel connected in sequence. The fixing bracket passes through the guide tube and is exposed to the first delivery channel. The cross-sectional dimensions of the first delivery channel and the second delivery channel are both larger than the cross-sectional dimensions of the connecting channel.

7. The Hall flow meter according to any one of claims 1 to 6, wherein The main body is provided with at least two positioning posts, the fixing frame is provided with at least two first positioning holes, and the circuit board is provided with at least two second positioning holes. The number of positioning posts, first positioning holes, and second positioning holes are equal and they are arranged in a one-to-one correspondence. Each positioning post passes through the corresponding first positioning hole and the corresponding second positioning hole. The fixing frame and the circuit board are riveted to the main body through the positioning posts.

8. The Hall flow meter of any one of claims 1 to 6, wherein, The main body is provided with a mounting groove, and the fixing frame and the circuit board are both disposed in the mounting groove, which is filled with a sealing element.

9. The Hall flow meter of any one of claims 1 to 6, wherein, The mounting bracket is an injection-molded part; or, The main body and the guide tube are integrally formed.

10. An infusion device, characterized by Includes the Hall flow meter as described in any one of claims 1 to 9.

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