Isolated liquid pressure detection mechanism

Abstract

The utility model discloses an isolated liquid pressure detection mechanism, including base, the side end face of base has the accommodation cavity, and the flow channel of being linked together with the accommodation cavity is opened in the base, and the deformation sealing element is set up in the accommodation cavity, and the side of deformation sealing element is opposite the flow channel, and the other side is away from the flow channel, and PCB is pasted in the base and is sealed with the opening of accommodation cavity through the compression deformation sealing element, and the sensing unit is set up on the PCB, and is electrically connected with PCB, and the deformation sealing element separates the flow channel with sensing unit, and forms the pressure transmission area between deformation sealing element and sensing unit. The utility model discloses the deformation sealing element in producing deformation, and the pressure change of deformation is passed to sensing unit through pressure transmission area, and sensing unit exports signal to the display of pressure numerical value for PCB, simple structure, the overall size can be reduced to the 1 / 10 below of prior art, can be integrated in miniature medical instrument, and assembly technology is simple.

Description

Technical Field

[0001] This utility model relates to a detection module, and more particularly to an isolated liquid pressure detection mechanism. Background Technology

[0002] In fields such as medical devices, fluid control, and precision sensing, precise detection of liquid pressure in flow channels is frequently required, especially in medical devices that infuse medications, where the accuracy, safety, and reliability of pressure detection are paramount. Conventional liquid pressure detection methods involve directly connecting the pressure sensor's probe into the flow channel, allowing it to directly contact the medication to detect pressure. However, this approach carries risks. The pressure sensor may contain materials harmful to humans, and prolonged contact with the medication could lead to the release of harmful substances, contaminating the medication. Furthermore, active ingredients in the medication may adsorb onto the sensor surface, affecting its effectiveness.

[0003] To address the aforementioned issues, a solution employing a flexible diaphragm for isolation has emerged. For example, Chinese utility model patent CN217827726U (Floor scrubber water tank water level detection) discloses a structure that separates the liquid from the sensor using a flexible diaphragm. One side of the diaphragm is connected to the liquid, while the other side is a sealed cavity containing a pressure sensor. Liquid pressure causes the diaphragm to deform, changing the air pressure within the sealed cavity. The sensor indirectly determines the liquid pressure or water level by detecting this pressure change.

[0004] However, in practical applications, the following inherent defects have been found in this solution: 1. It requires additional independent components such as a diaphragm assembly and a sealing cavity, resulting in a large overall size that cannot be integrated into micro-medical devices. Furthermore, the large volume of the internal sealing cavity leads to a long pressure transmission path and slow response speed, failing to meet the specific requirements of medical applications; 2. The structure is complex and has poor reliability, requiring strict sealing on both sides of the diaphragm. Leakage on either side will cause detection failure or a significant decrease in accuracy, demanding high assembly standards; 3. This structure requires the entire system to be in a fixed position. If tilted or inverted, it may cause changes in internal pressure, leading to false detections by the sensor, resulting in poor applicability.

[0005] Therefore, there is an urgent need for a liquid pressure testing mechanism that is simple and compact in structure, responds quickly, is highly reliable, and has no risk of contamination. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art by providing an isolated liquid pressure detection mechanism that has a simple structure, low cost, rapid response, high reliability, and can be well integrated into miniaturized devices.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: an isolated liquid pressure detection mechanism, comprising:

[0008] A base, wherein one end face of the base has a receiving cavity, and a flow channel is opened in the base and communicates with the receiving cavity, and the flow channel is used to flow external liquid;

[0009] A deformable seal is disposed within the accommodating cavity, with one side surface of the deformable seal in contact with the liquid in the flow channel and the other side facing away from the flow channel;

[0010] The PCB is attached to the base on the same side as the receiving cavity, and the opening of the receiving cavity is sealed by pressing the deformation seal.

[0011] A sensing unit is disposed on the PCB and electrically connected to the PCB; wherein, the deformation seal isolates the flow channel from the sensing unit, and a pressure transmission area is formed between the deformation seal and the sensing unit;

[0012] When the deformation seal deforms due to changes in the liquid pressure within the flow channel, the deformation seal can apply pressure to the sensing unit through the pressure transmission area, so that the sensing unit detects the pressure and outputs a detection signal through the PCB.

[0013] Furthermore, the flow channel includes a first liquid inlet, a second liquid passage, and an outlet connector; the first liquid inlet and the second liquid passage are connected, and the first liquid inlet is used to connect to an external liquid; the end of the second liquid passage is connected to the accommodating cavity; one end of the outlet connector is inserted into the accommodating cavity and is disposed opposite to one side of the deformable seal, and the other end extends out from the base from the side opposite to the accommodating cavity.

[0014] Furthermore, the deformation seal includes a sealing ring in the shape of an annular frame; the inner wall of the sealing ring is provided with an elastic thin wall, and the first end face of the elastic thin wall is in contact with the liquid in the flow channel, and the second end face is away from the flow channel; the inner wall of the accommodating cavity is provided with two grooves that are axially adapted to the sealing ring, and the upper and lower parts of the sealing ring are respectively embedded in the two grooves.

[0015] Furthermore, the pressure transmission area is the gas chamber formed between the PCB board and the deformation seal; the sensing unit is a pressure sensor used to sense the pressure in the gas chamber after the deformation seal deforms.

[0016] Furthermore, the pressure transmission area is the direct contact area between the deformation seal and the sensing unit; the sensing unit is a pressure sensor; wherein, when the deformation seal deforms, the deformation seal abuts against the sensing unit and transmits pressure.

[0017] Furthermore, the elastic thin wall has a contact boss on the side opposite to the PCB and a pressing boss on the side opposite to the flow channel; wherein, when the deformation seal deforms, the pressure in the flow channel is transmitted to the sensing unit through the pressing boss, the elastic thin wall and the contact boss.

[0018] Furthermore, a rigid gasket is provided between the pressing boss and the contact boss.

[0019] Furthermore, a hard part is embedded in the pressing boss.

[0020] Furthermore, the deformation seal is made of silicone or rubber.

[0021] Furthermore, the outer surface of the sensing unit is also coated with a bio-plating layer.

[0022] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0023] The isolated liquid pressure detection mechanism of this utility model consists of a base, a PCB, a deformation seal, and a sensing unit. After the deformation seal deforms, the pressure change generated by the deformation is transmitted to the sensing unit through the pressure transmission area. After sensing the change, the sensing unit outputs a signal to the PCB, which then displays the signal. The structure is simple, and the overall size can be reduced to less than 1 / 10 of the existing technology. It can be integrated into micro medical devices, and the assembly process is simple.

[0024] Secondly, by reducing the number of parts and size, this testing organization directly transmits pressure from the deformation seal to the sensing unit through the power transmission area, resulting in rapid response and simple assembly.

[0025] In addition, the deformation seal can effectively isolate the sensing unit, block the path of harmful substances precipitated from the sensing unit and contaminating the drug solution, and at the same time prevent the drug from adsorbing onto the sensing unit, which would reduce the drug efficacy, thus meeting the safety requirements of medical devices. Attached Figure Description

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings:

[0027] Figure 1 This is a cross-sectional view of Embodiment 1 of the present utility model;

[0028] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0029] Figure 3 This is a cross-sectional view of the deformable seal of Embodiment 1 of this utility model;

[0030] Figure 4for Figure 1 Another usage status diagram;

[0031] Figure 5 This is a cross-sectional view of Embodiment 2 of the present invention in use.

[0032] Figure 6 for Figure 5 A magnified view of a portion of the image;

[0033] Figure 7 This is a cross-sectional view of the deformable seal of Embodiment 2 of this utility model;

[0034] Figure 8 This is a cross-sectional view of the deformation seal with embedded hard parts in Embodiment 2 of this utility model;

[0035] Figure 9 This is a cross-sectional view of the deformable seal in Embodiment 2 of this utility model when a rigid gasket is provided;

[0036] The components include: base 1, deformation seal 2, PCB 3, sensing unit 4, accommodating cavity 10, flow channel 11, groove 100, first end liquid inlet 110, second end liquid channel 111, liquid outlet interface 112, gas chamber 20, sealing ring 21, elastic thin wall 22, pressing boss 23, contact boss 24, hard part 26, hard gasket 27, first end face 28, and second end face 29. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0038] Example 1

[0039] For ease of understanding, the specific processes in the embodiments of this application are described below. Please refer to [link / reference]. Figure 1 An isolated liquid pressure detection mechanism in this application embodiment includes a base 1, a deformation seal 2, a PCB 3, and a sensing unit 4.

[0040] The base 1 is the main body supporting this testing mechanism. The right end face of the base 1 has an outwardly opening receiving cavity 10, and the base 1 has a flow channel 11 that communicates with the receiving cavity 10. External liquid flows through the flow channel 11 in the base 1 and the receiving cavity 10.

[0041] See Figure 1 The flow channel 11 includes a first liquid inlet 110, a second liquid passage 111, and an outlet connector 112. The first liquid inlet 110 is vertically formed on the base 1, and external liquid flows in from the first liquid inlet 110. The second liquid passage 111 is horizontally formed inside the base 1, with one end communicating with the first liquid inlet 110 and the other end communicating with the receiving cavity 10. One end of the outlet connector 112 passes through the first liquid inlet 110 and the second liquid passage 111 and is inserted into the receiving cavity 10, while the other end extends out from the other side of the base 1. In this embodiment, the outlet connector 112 is an outlet needle, but it can also be in other forms.

[0042] The liquid flow pattern is as follows: external liquid flows in from the first end liquid inlet 110, and then flows into the accommodating cavity 10 through the second end liquid passage 111. The liquid flowing into the accommodating cavity 10 then flows out from the outlet 112, thus realizing the inflow and outflow of liquid.

[0043] See Figure 1 The deformable seal 2 is disposed within the accommodating cavity 10. One surface of the deformable seal 2 is in contact with the liquid in the flow channel 11, while the other side faces away from the flow channel 11. The deformable seal 2 is made of a flexible material, including but not limited to silicone, rubber, and other soft rubber materials that meet biocompatibility and drug compatibility requirements with the fluid in the flow channel. The hardness is adjusted according to actual strength requirements, but it needs to have the ability to deform, so that when the liquid in the flow channel 11 applies pressure to the deformable seal 2, it will deform accordingly.

[0044] See Figure 1 The PCB3 is attached to the base 1 on the same side as the receiving cavity 10, and the PCB3 seals the opening of the receiving cavity 10 through the compression deformation seal 2. The sensing unit 4 is disposed on the PCB3 and electrically connected to the PCB3. The deformation seal isolates the flow channel from the sensing unit, and a pressure transmission area is formed between the deformation seal and the sensing unit. The PCB3 functions to communicate with the sensing unit 4, communicate with external devices, and output corresponding pressure values.

[0045] See Figures 1 to 2In this embodiment, the sensing unit 4 is a pressure sensor, and the term "pressure sensor" will be used to refer to the sensing unit 4 in the following text. The pressure sensor is mounted on the PCB3 and electrically connected to the PCB3. The pressure sensor outputs a corresponding detection signal through the PCB3. Thus, the pressure sensor is located on the side of the deformation seal 2 facing away from the flow channel 11, and the deformation seal 2 isolates the pressure sensor from the flow channel 11. A pressure transmission region is formed between the deformation seal 2 and the pressure sensor. This pressure transmission region is specifically manifested as a sealed gas chamber 20 composed of the PCB3 and the deformation seal 2.

[0046] See Figure 1 and Figure 4 When the liquid pressure in the flow channel 11 increases, the deformation seal 2 undergoes an inward deformation toward the pressure sensor, causing the volume of the gas chamber 20 to decrease. As the volume decreases, the pressure increases accordingly. The pressure sensor located in the gas chamber 20 can sense the increase in pressure, thus indicating that the pressure in the flow channel 11 has also changed accordingly. The pressure sensor then outputs a corresponding detection signal to the PCB.

[0047] See Figure 2 and Figure 3 In this embodiment, the deformable sealing element 2 includes a sealing ring 21 in the shape of an annular frame; the inner wall of the sealing ring 21 is provided with an elastic thin wall 22, and the first end face 28 of the elastic thin wall 22 is in contact with the liquid in the flow channel 11, and the second end face 29 is away from the flow channel 11; in this way, the pressure of the liquid will directly contact the first end face 28 and generate corresponding pressure on the elastic thin wall 22.

[0048] Two grooves 100 are provided on the inner wall of the accommodating cavity 10 to be axially adapted to the sealing ring 21. In this way, during installation, the upper and lower parts of the sealing ring 21 are respectively embedded in the two grooves 100, realizing the axial limitation of the sealing ring 21. This is convenient for installation and can also avoid the subsequent deformation of the sealing element 2 after being squeezed by liquid pressure, which would lead to inaccurate pressure transmission and ensure the accuracy of detection.

[0049] In addition, the outer surface of the pressure sensor is coated with a bio-plating layer, including but not limited to a phenelzine coating, which can better isolate the drug solution from the internal components of the pressure sensor, reduce the release of harmful substances from the internal components of the pressure sensor or the effectiveness of the drug solution, thereby reducing the risk of use.

[0050] See Figures 1 to 4 The usage process is as follows:

[0051] External liquid flows in from the first end liquid inlet 110, passes through the second end liquid passage 111 and enters the accommodating cavity 10. After the external liquid comes into contact with the first end face 28 on the elastic thin wall 22, it flows out from the outlet 112, forming a circulating cycle.

[0052] When external liquid flows into the accommodating cavity 10, the liquid pressure acts directly on the first end face 28 of the elastic thin wall 22. When there is a blockage or other problem in the pipeline, the liquid pressure in the flow channel 11 increases. The liquid pressure pushes the elastic thin wall 22 to deform towards the side of the pressure sensor, thereby compressing the volume of the gas chamber 20 and reducing its volume. At this time, the pressure in the gas chamber 20 increases. After the pressure sensing unit detects the pressure change, it processes the signal through the PCB3 and sends it to the external receiving device. It should be noted that the pressure value detected by the pressure sensor in this embodiment is not the actual value of the hydraulic pressure in the flow channel. Within the pressure threshold, the pressure sensor reading is basically positively correlated with the hydraulic pressure. Specifically, the correspondence between the sensor reading and the actual hydraulic pressure value can be obtained through experimental data collection and processing. Then, the hydraulic pressure value can be calculated from the reading data, so that the pressure value in the flow channel 11 can be detected in real time and accurately, and various unexpected situations can be dealt with in a timely manner.

[0053] Example 2

[0054] See Figures 5 to 7 The difference between this embodiment and embodiment 1 is that the pressure transmission area in this embodiment is the direct contact area between the deformation seal 2 and the sensing unit 4. The corresponding sensing unit 4 in this embodiment is a pressure sensor, and the pressure sensor will be used to replace the sensing unit 4 in the following text. In this way, when the deformation seal 2 deforms, the deformation seal 2 can directly contact the pressure sensor, and the pressure sensor outputs a corresponding signal to the PCB. After processing by the PCB, the signal is sent to an external device for display.

[0055] Furthermore, in order to make the contact pressure more precise, a contact boss 24 is added to the second end face 29 of the elastic thin wall 22 that is opposite to the PCB3, and a pressing boss 23 that is directly opposite to the flow channel 11 is added to the first end face.

[0056] When blockages occur in the pipes, the liquid pressure in the flow channel 11 increases, and the liquid in the flow channel deforms to the right through the first end face of the elastic thin wall 22. After the elastic thin wall 22 deforms, the increased pressure in the flow channel 11 is directly transmitted to the elastic thin wall 22 through the pressing boss 23, and then the elastic thin wall 22 transmits the pressure to the pressure sensor through the contact boss 24. The pressure sensor transmits the detected pressure value to the PCB, and the PCB 3 processes the signal and sends it to the external receiving device, so that the staff can take corresponding measures based on the detected value.

[0057] In this embodiment, the elastic thin wall 22 is a flexible film. The flexible film can deform to transmit pressure when subjected to slight pressure, so as to ensure that it can deform to transmit force to the pressure sensor when subjected to pressure on the liquid side.

[0058] See Figure 9 A rigid pad 27 is provided between the pressing boss 23 and the contact boss 24, thereby greatly enhancing the contact strength between the pressing boss 23 and the contact boss 24, reducing deformation of both, and improving detection accuracy and sensitivity; see reference Figure 8 Alternatively, a hard part 26 can be pre-embedded in the pressing boss 23 to enhance the strength of the pressing boss 23. The hard pad 27 and the hard part 26 are not limited to materials such as metal or plastic.

[0059] In addition, the pressing boss 23 and the contact boss 24 can be thickened to reduce the deformation at the two boss positions, thereby improving the detection accuracy; at the same time, the thickened two bosses can improve the wear resistance life and prevent the detection head of the pressure sensor from wearing through the elastic thin wall 22 and causing leakage.

[0060] See Figure 6 In the initial state, the contact boss 24 and the pressure sensor have a certain pre-pressure value. This pre-pressure can be structurally adjusted according to the actual use scenario. Specifically, the contact boss 24 adopts a thickened design so that the contact boss 24 always maintains a preset pressure with the pressure sensor in the initial state, ensuring the stability of the 0-point reference when detecting positive and negative pressure.

[0061] In the initial pre-pressure state, both positive and negative pressure can be detected. For example, if the output value of the pressure sensor is set to 0 in this initial pre-pressure state, then when positive pressure is generated by liquid entering the liquid path, the output value of the pressure sensor will be greater than 0, and when negative pressure is generated due to backflow in the liquid path, the output value of the pressure sensor will be less than 0.

[0062] See Figures 5 to 7 The usage process is as follows:

[0063] External liquid flows in from the first end liquid inlet 110, passes through the second end liquid passage 111 and enters the accommodating cavity 10. At this time, the liquid is located on the left side of the deformation seal 2. Then, the external liquid flows out from the outlet 112, forming a liquid flow.

[0064] When external liquid flows into the accommodating cavity 10, the liquid pressure acts directly on the first end face 28 of the elastic thin wall 22. When there is a blockage or other problem in the pipeline, the liquid pressure in the flow channel 11 increases, causing the elastic thin wall 22 to deform. The increased liquid pressure is first transmitted to the pressing boss 23, and then from the pressing boss 23 to the contact boss 24 through the elastic thin wall 22. At this time, the contact boss 24 is in direct contact with the pressure sensor. In this way, after the pressure sensor detects a change in pressure, it transmits a signal to the PCB3. The PCB3 then processes the signal and sends it to the external receiving device, allowing the operator to take appropriate measures in real time.

[0065] In summary, this isolated liquid pressure detection mechanism consists of a base, PCB, deformation seal, and sensing unit, forming a detection mechanism with a simple structure. The overall size can be reduced to less than 1 / 10 of the existing technology, and it can be integrated into micro medical devices. The pressure is transmitted from the deformation seal to the sensing unit through the power transmission area, resulting in rapid response and simple assembly.

[0066] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An isolated liquid pressure detection mechanism, characterized in that, include: A base, wherein one end face of the base has a receiving cavity, and a flow channel is opened in the base and communicates with the receiving cavity, and the flow channel is used to flow external liquid; A deformable seal is disposed within the accommodating cavity, with one side surface of the deformable seal in contact with the liquid in the flow channel and the other side facing away from the flow channel; The PCB is attached to the base on the same side as the receiving cavity, and the opening of the receiving cavity is sealed by pressing the deformation seal. A sensing unit is disposed on the PCB and electrically connected to the PCB; wherein, the deformation seal isolates the flow channel from the sensing unit, and a pressure transmission area is formed between the deformation seal and the sensing unit; When the deformation seal deforms due to changes in the liquid pressure within the flow channel, the deformation seal can apply pressure to the sensing unit through the pressure transmission area, so that the sensing unit detects the pressure and outputs a detection signal through the PCB.

2. The isolated liquid pressure detection mechanism as described in claim 1, characterized in that: The flow channel includes a first liquid inlet, a second liquid passage, and an outlet connector; the first liquid inlet and the second liquid passage are connected, and the first liquid inlet is used to connect to an external liquid; the end of the second liquid passage is connected to the accommodating cavity; one end of the outlet connector is inserted into the accommodating cavity and is positioned opposite to one side of the deformable seal, and the other end extends out from the side of the base opposite to the accommodating cavity.

3. The isolated liquid pressure detection mechanism as described in claim 1, characterized in that: The deformation seal includes a sealing ring in the shape of an annular frame; the inner wall of the sealing ring is provided with an elastic thin wall, and the first end face of the elastic thin wall is in contact with the liquid in the flow channel, and the second end face is away from the flow channel; the inner wall of the accommodating cavity is provided with two grooves that are axially adapted to the sealing ring, and the upper and lower parts of the sealing ring are respectively embedded in the two grooves.

4. The isolated liquid pressure detection mechanism as described in claim 1, characterized in that: The pressure transmission area is the gas chamber formed between the PCB board and the deformation seal; the sensing unit is a pressure sensor used to sense the pressure in the gas chamber after the deformation seal is deformed.

5. The isolated liquid pressure detection mechanism as described in claim 3, characterized in that: The pressure transmission area is the direct contact area between the deformable seal and the sensing unit; the sensing unit is a pressure sensor; wherein, when the deformable seal deforms, it transmits pressure after contacting the sensing unit.

6. The isolated liquid pressure detection mechanism as described in claim 5, characterized in that: The elastic thin wall has a contact boss on the side opposite to the PCB and a pressing boss on the side opposite to the flow channel; wherein, when the deformation seal deforms, the pressure in the flow channel is transmitted to the sensing unit in sequence through the pressing boss, the elastic thin wall and the contact boss.

7. The isolated liquid pressure detection mechanism as described in claim 6, characterized in that: A rigid gasket is provided between the pressing boss and the contact boss.

8. The isolated liquid pressure detection mechanism as described in claim 6, characterized in that: A hard part is embedded in the pressing boss.

9. The isolated liquid pressure detection mechanism as described in claim 1, characterized in that: The deformation seal is made of silicone or rubber.

10. The isolated liquid pressure detection mechanism as described in claim 1, characterized in that: The outer surface of the sensing unit is also coated with a bio-plating layer.

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