A three-way fluid circuit structure and its micropump

Abstract

This invention discloses a three-way liquid circuit structure and its micropump. The three-way liquid circuit includes a base with a first flow channel, a second flow channel, and a third flow channel. The inlet end of the first flow channel is used to introduce external liquid into the interior of the base, and the outlet end of the first flow channel is connected to the inlet end of the second flow channel, which is sealed by a pressure sensor assembly. The inlet end of the third flow channel is connected to the outlet end of the second flow channel, and the outlet end of the third flow channel is used to lead the liquid inside the base to the outside of the base. In this design, the first flow channel is used for liquid inlet, the third flow channel for liquid outlet, and the second flow channel is used to install the pressure sensor assembly to measure the pressure of the liquid inside the base. The connection between the inlet end of the third flow channel and the outlet end of the second flow channel prevents gas accumulation at the outlet end of the second flow channel, thereby improving the measurement accuracy of the pressure sensor assembly.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to a three-way fluid circuit structure and its micropump. Background Technology

[0002] In a conventional three-way fluid circuit, liquid enters from one end and exits from the other two. Whether liquid exits from the two outlets and the amount of liquid exiting are affected by the size of the two outlet channels and the back pressure. If one outlet is blocked, some gas will be trapped inside and unable to escape. Furthermore, because the angles of the inlet relative to the two outlets in the three-way fluid circuit are different, the pressure at the two outlets will also be affected. Based on these issues, it can be clearly concluded that the piping used to install pressure sensors on existing three-way pipelines is prone to gas accumulation, thus affecting the measurement accuracy of the pressure sensor. Additionally, due to differences in the positions and angles of the three ports, the pressure sensor readings may deviate from the actual fluid pressure. Existing patents also propose some installation schemes for three-way fluid circuits and pressure sensors, as follows:

[0003] The patent, authorized by CN222228795U and entitled "A Micropump," specifically proposes that the micropump also includes a pressure sensor for detecting the fluid pressure in the outlet channel. The pressure sensor is mounted on a second substrate, which has a pressure-measuring channel communicating with the outlet channel. The outlet channel includes a first channel, a second channel, and a third channel. The first end of the first channel communicates with the outlet connector, the second end of the first channel communicates with the first end of the second channel, the second end of the second channel communicates with the first end of the third channel, and the second end of the third channel communicates with the pump outlet. The first and third channels are located at opposite ends of the second channel and are perpendicular to each other. The first and second channels are formed along the plane of the second substrate. The pressure-measuring channel communicates with the second channel and is parallel to the first channel, located near the side where the second and third channels communicate. The three-way liquid circuit of this scheme has one inlet end and two outlet ends. One outlet end is used to discharge the liquid in the three-way liquid circuit; the other outlet end is set on the pressure measuring flow channel and is sealed by the pressure sensor. Therefore, this outlet end is prone to gas accumulation, which affects the measurement accuracy of the pressure sensor.

[0004] In summary, the technical problem that this application actually needs to solve is: how to avoid gas accumulation at the pressure measuring end of the tee pipe. Utility Model Content

[0005] To address the aforementioned technical problems, this invention proposes a three-way liquid path structure and its micropump. The first flow channel is used for liquid inlet, the third flow channel for liquid outlet, and the second flow channel for mounting a pressure sensor assembly to measure the pressure of the liquid inside the base. The inlet end of the third flow channel is connected to the outlet end of the second flow channel to prevent gas accumulation at the outlet end of the second flow channel, thereby improving the measurement accuracy of the pressure sensor assembly.

[0006] Specifically, this utility model proposes a three-way fluid passage structure, including a base, wherein the base has a first flow channel, a second flow channel and a third flow channel;

[0007] The inlet end of the first flow channel is used to introduce external liquid into the interior of the base, the outlet end of the first flow channel is connected to the inlet end of the second flow channel, and the outlet end of the second flow channel is closed by a pressure sensor assembly.

[0008] The inlet end of the third flow channel is connected to the outlet end of the second flow channel, and the outlet end of the third flow channel is used to draw the liquid inside the base out to the outside of the base.

[0009] Preferably, the inlet end of the third flow channel is close to the pressure sensor assembly.

[0010] Preferably, the base is equipped with a liquid outlet needle, and the needle hole of the liquid outlet needle is a third flow channel.

[0011] Preferably, the dispensing needle is pre-embedded and fixed on the base; or the dispensing needle is installed in the mounting channel of the base by means of adhesive.

[0012] Preferably, the pressure sensor assembly includes a pressure sensor and a sealing gasket, wherein the pressure sensor is fixed to the base by the sealing gasket, and the inner hole of the sealing gasket is connected to the end of the second flow channel.

[0013] Preferably, the liquid flow directions in the third flow channel and the second flow channel are opposite.

[0014] Preferably, the dispensing needle is a straight needle or a curved needle.

[0015] Preferably, the base has a mounting port for mounting the sensor assembly.

[0016] In addition, this application also proposes a micropump that includes the above-mentioned three-way fluid passage structure.

[0017] Furthermore, the inlet end of the first flow channel is connected to the outlet of the pump chamber in the micropump. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 This is a schematic diagram of the internal structure of the first type of three-way fluid passage structure proposed in this embodiment;

[0020] Figure 2 This is a three-dimensional structural diagram of the first type of three-way fluid passage structure proposed in this embodiment;

[0021] Figure 3 This is a schematic diagram of the internal structure of the base in the first structure of the three-way fluid passage structure proposed in this embodiment;

[0022] Figure 4 This is a three-dimensional structural diagram of the base in the first structure of the three-way fluid passage structure proposed in this embodiment;

[0023] Figure 5 This is a schematic diagram of the liquid flow direction in the three-way liquid passage structure proposed in this embodiment;

[0024] Figure 6 This is a schematic diagram of the internal structure of the second type of three-way fluid passage structure proposed in this embodiment.

[0025] Figure 7 This is a schematic diagram showing the connection between the outlet of the micropump and the first flow channel proposed in this embodiment.

[0026] The reference numerals used in the attached figures are as follows:

[0027] 11-Base; 12-First flow channel; 13-Second flow channel; 14-Third flow channel; 15-Discharge needle; 16-Pressure sensor; 17-Sealing gasket; 18-Mounting port; 19-Mounting channel; 20-Discharge port. Detailed Implementation

[0028] The technical solutions of this application will be further described below with reference to specific embodiments, but this application is not limited to these embodiments.

[0029] like Figures 1 to 6 As shown, this embodiment proposes a three-way fluid passage structure, including a base 11, which has a first flow channel 12, a second flow channel 13 and a third flow channel 14.

[0030] The inlet end of the first flow channel 12 is used to introduce external liquid into the interior of the base 11. The outlet end of the first flow channel 12 is connected to the inlet end of the second flow channel 13. The outlet end of the second flow channel 13 is closed by a pressure sensor assembly.

[0031] The inlet end of the third flow channel 14 is connected to the outlet end of the second flow channel 13, and the outlet end of the third flow channel 14 is used to draw the liquid inside the base 11 out to the outside of the base 11.

[0032] In this design, the first flow channel 12 is used for liquid inlet, the third flow channel 14 is used for liquid outlet, and the second flow channel 13 is used to install the pressure sensor assembly to measure the pressure of the liquid inside the base 11. The inlet end of the third flow channel 14 is connected to the outlet end of the second flow channel 13 to prevent gas accumulation at the outlet end of the second flow channel 13, thereby improving the measurement accuracy of the pressure sensor assembly.

[0033] Furthermore, the base 11 uses plastic parts as the carrier of the liquid path, increases the diameter of the liquid path and the direction of the pipe, and simplifies the mold structure.

[0034] Furthermore, the inlet end of the third flow channel 14 is close to the pressure sensor assembly.

[0035] Furthermore, the pressure sensor assembly includes a pressure sensor 16 and a sealing gasket 17. The pressure sensor 16 is fixed to the base 11 by the sealing gasket 17, and the inner hole of the sealing gasket 17 is connected to the end of the second flow channel 13. In this embodiment, the sealing gasket 17 is used to form a sealed structure between the pressure sensor 16 and the outlet end of the second flow channel 13, while the pressure sensor 16 is used to detect the liquid in the inner hole of the sealing gasket 17.

[0036] In one embodiment of this invention, a liquid outlet needle 15 is installed in the base 11, and the needle hole of the liquid outlet needle 15 is the third flow channel 14. The technical advantage of this solution is that, without increasing the flow channel volume, the flow channel diameter of the base 11 is increased, which facilitates mold manufacturing and extends the molding life. Furthermore, the overall part structure is simple, facilitating production assembly and quality control.

[0037] A portion of the liquid outlet needle 15 is inserted into the second flow channel 13, and another portion of the liquid outlet needle 15 is used to guide the liquid to the outside of the base 11.

[0038] As one implementation method of this embodiment, such as Figure 6 As shown, the dispensing needle 15 is pre-embedded and fixed on the base 11; or as shown in the figure. Figures 1 to 4 As shown, the dispensing needle 15 is installed in the mounting channel 19 of the base 11 by adhesive.

[0039] Furthermore, such as Figure 5 As shown, the inlet end of the liquid outlet needle 15 is flush with the outlet end of the second flow channel 13, and the inlet end of the liquid outlet needle 15 and the outlet end of the second flow channel 13 are respectively connected to the inner hole of the sealing gasket 17. The liquid in the second flow channel 13 flows into the third flow channel 14 through the inner hole of the sealing gasket 17.

[0040] In this design, liquid will continuously flow in the inner hole of the sealing gasket 17, which can effectively prevent gas accumulation in the inner hole of the sealing gasket 17 and effectively improve the detection accuracy of the pressure sensor 16.

[0041] In one embodiment of this invention, the dispensing needle 15 is a straight needle, in which case the liquid flow directions in the third flow channel 14 and the second flow channel 13 are opposite. Alternatively, the dispensing needle 15 can also be a curved needle.

[0042] As one embodiment of this invention, the base 11 is provided with a mounting port 18 for mounting sensor components.

[0043] This application also proposes a micropump, such as Figures 1 to 7 As shown, this includes the aforementioned three-way fluid path structure. Using this three-way fluid path structure, the micropump can accurately measure the liquid pumping pressure.

[0044] Furthermore, the inlet end of the first flow channel 12 is connected to the outlet 20 of the pump chamber in the micropump. At this point, the three-way liquid path structure in this design serves as the outlet flow channel of the micropump, enabling accurate measurement of the micropump's outlet pressure. Additionally, the pumping principle of the micropump itself is existing technology; other structures and pumping principles of the micropump can be referenced from existing technologies. Therefore, this paper will not elaborate further on the structure and working principle of the micropump.

[0045] For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A three-way fluid passage structure, characterized in that, Includes a base (11) having a first flow channel (12), a second flow channel (13) and a third flow channel (14); The inlet end of the first flow channel (12) is used to introduce external liquid into the interior of the base (11), the outlet end of the first flow channel (12) is connected to the inlet end of the second flow channel (13), and the outlet end of the second flow channel (13) is closed by a pressure sensor assembly. The inlet end of the third flow channel (14) is connected to the outlet end of the second flow channel (13), and the outlet end of the third flow channel (14) is used to draw the liquid inside the base (11) to the outside of the base (11).

2. The tee junction structure of claim 1, wherein The inlet end of the third flow channel (14) is close to the pressure sensor assembly.

3. The tee structure of claim 1, wherein The base (11) is equipped with a liquid outlet needle (15), and the needle hole of the liquid outlet needle (15) is the third flow channel (14).

4. The tee junction structure of claim 3, wherein The dispensing needle (15) is pre-embedded and fixed on the base (11); or the dispensing needle (15) is installed in the mounting channel (19) of the base (11) by fixing adhesive.

5. The tee structure of claim 1, wherein The pressure sensor assembly includes a pressure sensor (16) and a sealing gasket (17). The pressure sensor (16) is fixed to the base (11) by the sealing gasket (17), and the inner hole of the sealing gasket (17) is connected to the end of the second flow channel (13).

6. The tee structure according to claim 5, wherein The liquid flow directions in the third flow channel (14) and the second flow channel (13) are opposite.

7. The tee structure according to claim 3, wherein The dispensing needle (15) is either a straight needle or a curved needle.

8. The tee structure of claim 1, wherein The base (11) is provided with a mounting port (18) for mounting the sensor assembly.

9. A micropump characterized by It includes a three-way fluid passage structure as described in any one of claims 1 to 8.

10. The micropump of claim 9, wherein, The inlet end of the first flow channel (12) is connected to the outlet (20) of the pump chamber in the micro pump.

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