Air pressure detection system for pipetting device and pipetting device

Abstract

The utility model relates to the technical field of medical treatment, in particular to an air pressure detection system for a pipetting device, which comprises a shell and an air pressure detection assembly, wherein the shell is provided with an air pressure detection cavity, a detection channel and a piston cavity which are communicated in sequence; the caliber of one end of the detection channel close to the air pressure detection cavity is larger than that of one end of the detection channel close to the piston cavity; the piston cavity is used for moving the piston rod; the air pressure detection assembly is arranged in the air pressure detection cavity and used for detecting the air pressure of the piston cavity through the detection channel. The utility model further relates to a pipetting device. According to the technical scheme, the air pressure detection accuracy can be improved.

Description

Technical Field

[0001] The present application relates to the field of medical technology, and in particular to an air pressure detection system for a liquid transfer device and a liquid transfer device. Background Art

[0002] At present, in the pneumatic liquid level detection system of the pipetting device, a pneumatic pressure sensor is used to detect the air pressure changes in the piston cylinder, which can determine whether the liquid is sucked empty or bubbles are sucked in during the pipetting process; however, under the condition of unstable gas flow, the existing pneumatic pressure detection system may not be able to provide stable and accurate pneumatic pressure detection, resulting in low accuracy of pneumatic pressure detection. Utility Model Content

[0003] Based on this, an embodiment of the present application provides an air pressure detection system for a pipetting device and a pipetting device, which are used to solve the problem of low accuracy of air pressure detection.

[0004] In order to solve the above technical problems, the embodiment of the present application provides an air pressure detection system for a liquid transfer device, which adopts the following technical solution:

[0005] An air pressure detection system for a liquid transfer device, comprising:

[0006] The housing is formed with an air pressure detection chamber, a detection channel and a piston chamber which are connected in sequence; the diameter of the detection channel close to one end of the air pressure detection chamber is larger than the diameter of the detection channel close to one end of the piston chamber; the piston chamber is used for the piston rod to move;

[0007] An air pressure detection component is arranged in the air pressure detection chamber and is used to detect the air pressure of the piston chamber through the detection channel.

[0008] Furthermore, the detection channel comprises an inlet section, a guide section and an outlet section which are connected in sequence;

[0009] One end of the inlet section away from the guide section is connected to the air pressure detection chamber;

[0010] The guide section is used to guide the gas in the inlet section to the outlet section;

[0011] One end of the outflow section away from the guide section is communicated with the piston cavity, and the caliber of the outflow section is larger than the caliber of the inflow section.

[0012] Furthermore, the caliber of the flow guide section increases gradually along the direction from the inlet section toward the outlet section.

[0013] Furthermore, the caliber of the detection channel increases gradually along the direction from the piston cavity toward the air pressure detection cavity.

[0014] Furthermore, the detection end of the air pressure detection component is arranged in one end of the detection channel close to the air pressure detection cavity.

[0015] Furthermore, the air pressure detection system also includes a sealing member;

[0016] The detection end of the air pressure detection assembly is sealed and connected to an end of the detection channel close to the air pressure detection cavity through the sealing member.

[0017] Furthermore, the housing is further formed with an installation cavity, and the two ends of the installation cavity are respectively connected with the air pressure detection cavity and an end of the detection channel close to the air pressure detection cavity; wherein:

[0018] The sealing member is arranged in the installation cavity; and / or,

[0019] The air pressure detection component is abutted and sealed against one end of the installation cavity close to the air pressure detection cavity.

[0020] Further, the housing includes a first housing and a second housing connected to each other;

[0021] The piston chamber is formed in the second housing;

[0022] The air pressure detection chamber is formed by enclosing the first shell and the second shell;

[0023] An accommodating cavity communicated with the piston cavity is formed in the first shell.

[0024] Furthermore, the first housing is formed with a communication channel, and two ends of the communication channel are respectively communicated with the air pressure detection chamber and the accommodating chamber;

[0025] The air pressure detection component includes an air pressure sensor and a control board; the air pressure sensor is electrically connected to the control board, and the detection end of the air pressure sensor is arranged toward the detection channel; one end of the control board is arranged in the air pressure detection cavity, and the other end is arranged in the accommodating cavity through the connecting channel, and the cross-sectional area of ​​the control board matches that of the connecting channel.

[0026] In order to solve the above technical problems, the present application also provides a liquid transfer device, which adopts the following technical solution:

[0027] A liquid transfer device comprises the air pressure detection system for the liquid transfer device as described above.

[0028] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects: since the caliber of the detection channel close to the air pressure detection chamber end is larger than the caliber of the detection channel close to the piston chamber end, on the one hand, the gas resistance flowing from the detection channel to its end close to the air pressure detection chamber can be reduced, so that the gas in the detection channel can flow smoothly and evenly to the air pressure detection component, thereby improving the accuracy of the air pressure detection component in detecting the piston chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the scheme of the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 is a schematic diagram of the three-dimensional structure of an air pressure detection system for a liquid transfer device according to an embodiment of the present application;

[0031] Figure 2 is a schematic diagram of a three-dimensional cross-sectional structure of an air pressure detection system for a liquid transfer device according to an embodiment of the present application;

[0032] Figure 3 yes Figure 2 Schematic diagram of the main structure;

[0033] Figure 4 yes Figure 3 Schematic diagram of the structure behind the hidden air pressure detection component;

[0034] Figure 5 It is a schematic diagram of the three-dimensional structure of the liquid transfer device according to an embodiment of the present application.

[0035] Reference numerals:

[0036] 100, shell; 110, air pressure detection chamber; 120, detection channel; 121, inlet section; 122, guide section; 123, outlet section; 130, piston chamber; 140, installation chamber; 150, first shell; 151, connecting channel; 160, second shell; 200, air pressure detection assembly; 210, air pressure sensor; 220, control board; 300, sealing member. DETAILED DESCRIPTION

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0040] The embodiment of the present application provides an air pressure detection system for a liquid transfer device. The liquid transfer device is used to absorb liquid from an original container and also to transfer the absorbed liquid to another container; accordingly, the air pressure detection system is used to detect the change of air pressure in the piston chamber 130 during the process of taking and transferring liquid by the liquid transfer device, so as to ensure the accuracy of the liquid transfer and taking by the liquid transfer device.

[0041] See also Figures 1 to 4 The air pressure detection system includes a shell 100 and an air pressure detection assembly 200; the shell 100 is formed with an air pressure detection chamber 110, a detection channel 120 and a piston chamber 130 which are connected in sequence; the diameter of the detection channel 120 close to the air pressure detection chamber 110 is larger than the diameter of the detection channel 120 close to the piston chamber 130; the piston chamber 130 is used for the movement of the piston rod; the air pressure detection assembly 200 is arranged in the air pressure detection chamber 110, and is used to detect the air pressure of the piston chamber 130 through the detection channel 120.

[0042] In this embodiment, the gas in the piston chamber 130 can move in a direction close to the air pressure detection chamber 110 through the detection channel 120 , thereby enabling the air pressure detection component 200 to detect the air pressure of the piston chamber 130 .

[0043] It can be understood that since the caliber of the detection channel 120 at one end close to the air pressure detection chamber 110 is larger than the caliber of the detection channel 120 at one end close to the piston chamber 130, on the one hand, the gas resistance flowing from the detection channel 120 to its end close to the air pressure detection chamber 110 can be reduced, so that the gas in the detection channel 120 can flow smoothly and evenly to the air pressure detection component 200, thereby improving the accuracy and stability of the air pressure detection component 200 in detecting the piston chamber 130; on the other hand, the gas flowing in the detection channel 120 to one end of the air pressure detection chamber 110 can flow smoothly to buffer the gas in the detection channel 120, thereby reducing the influence of the gas flow caused by the movement of the piston rod in the piston chamber 130 on the air pressure detection component 200, and further improving the accuracy of the air pressure detection component 200 in detecting the piston chamber 130.

[0044] In some embodiments, see Figures 1 to 4 The detection channel 120 includes an inlet section 121, a guide section 122, and an outlet section 123 connected in sequence; the end of the inlet section 121 away from the guide section 122 is connected to the air pressure detection chamber 110; the guide section 122 is used to guide the gas in the inlet section 121 to the outlet section 123; the end of the outlet section 123 away from the guide section 122 is connected to the piston chamber 130, and the caliber of the outlet section 123 is larger than the caliber of the inlet section 121. In this way, the gas can be smoothly and smoothly transferred from the inlet section 121 to the outlet section 123 through the guide section 122, which helps to improve the stability and accuracy of air pressure detection of the air pressure detection component 200.

[0045] Further, see Figures 1 to 4 , the caliber of the guide section 122 increases along the direction from the inlet section 121 to the outlet section 123. In this way, the caliber of the guide section 122 increases in the direction close to the outlet section 123, which can gradually slow down the flow rate of the gas from the inlet section 121 to the outlet section 123, further improving the stability of the gas flow in the detection channel 120, and can gradually diffuse the gas from the inlet section 121 to the outlet section 123, so that the gas flowing to the outlet section 123 is more uniform, further improving the stability of the gas flow in the detection channel 120; in this way, the stability and accuracy of the air pressure detection of the air pressure detection component 200 are further improved.

[0046] In other embodiments, the caliber of the detection channel 120 increases gradually from the piston cavity 130 toward the air pressure detection cavity 110. In this way, when the gas flows from the piston cavity 130 toward the air pressure detection cavity 110, the flow rate of the gas is gradually slowed down, and the gas gradually diffuses in the detection channel 120, so that the gas in the detection channel 120 can flow more smoothly and evenly to the air pressure detection component 200, thereby further improving the accuracy and stability of the air pressure detection component 200 in detecting the piston cavity 130.

[0047] In some embodiments, see Figures 1 to 4 The detection end of the air pressure detection component 200 is arranged in one end of the detection channel 120 close to the air pressure detection chamber 110. In this way, on the one hand, the timeliness of the detection of the air pressure detection component 200 can be ensured, and on the other hand, the gas in the end of the detection channel 120 close to the air pressure detection chamber 110 can be fully in contact with the detection end of the air pressure detection component 200, thereby improving the detection accuracy of the air pressure detection component 200.

[0048] In some embodiments, see Figures 1 to 4 The air pressure detection system further includes a seal 300; the detection end of the air pressure detection assembly 200 is sealed and connected to one end of the detection channel 120 close to the air pressure detection cavity 110 through the seal 300. In this way, the air tightness of the connection between the detection end of the air pressure detection assembly 200 and the end of the detection channel 120 close to the air pressure detection cavity 110 is ensured, and the gas leakage at the end of the detection channel 120 close to the air pressure detection cavity 110 is prevented, and the good air tightness effectively improves the accuracy and stability of the air pressure detection of the air pressure detection assembly 200.

[0049] In some embodiments, see Figures 1 to 4 The sealing member 300 is a sealing ring, which is sleeved on the detection end of the air pressure detection assembly 200. In this way, the elasticity of the sealing ring is utilized to effectively improve the sealing between the detection end of the air pressure detection assembly 200 and the end of the detection channel 120 close to the air pressure detection cavity 110.

[0050] It can be understood that after the detection end of the air pressure detection component 200 is installed to the end of the detection channel 120 close to the air pressure detection chamber 110, in one example, a sealing ring can be set between the detection end of the air pressure detection component 200 and the end of the detection channel 120 close to the air pressure detection chamber 110 to fill the gap between the two, thereby achieving a sealed connection between the two; in another example, a sealing ring can be set on the outside of the end of the detection channel 120 close to the air pressure detection chamber 110 to serve as an external component to cover the gap between the detection end of the air pressure detection component 200 and the end of the detection channel 120 close to the air pressure detection chamber 110, thereby also achieving a sealed connection between the two.

[0051] In some embodiments, see Figures 1 to 4 The shell 100 also forms an installation cavity 140, and the two ends of the installation cavity 140 are respectively connected to the air pressure detection cavity 110 and the end of the detection channel 120 close to the air pressure detection cavity 110. At this time, the detection end of the above-mentioned air pressure detection component 200 enters from the installation cavity 140 into the end of the detection channel 120 close to the air pressure detection cavity 110.

[0052] Furthermore, in some embodiments, the sealing member 300 is disposed in the installation cavity 140. In this way, on the one hand, the sealing member 300 does not need to be disposed between the detection end of the air pressure detection assembly 200 and the end of the detection channel 120 close to the air pressure detection cavity 110, thereby making the structure of the end of the detection channel 120 close to the air pressure detection cavity 110 more compact, thereby improving the structural stability of the housing 100; on the other hand, while achieving a sealed connection between the detection end of the air pressure detection assembly 200 and the end of the detection channel 120 close to the air pressure detection cavity 110, the detection end of the air pressure detection assembly 200 is easier to enter into the end of the detection channel 120 close to the air pressure detection cavity 110, thereby improving the installation convenience of the detection end of the air pressure detection assembly 200.

[0053] Further, in some embodiments, see Figures 1 to 4 , the air pressure detection assembly 200 is abutted and sealed against one end of the installation cavity 140 near the air pressure detection cavity 110. In this way, while the seal 300 seals and connects the detection end of the air pressure detection assembly 200 with the end of the detection channel 120 near the air pressure detection cavity 110 to form a first seal, the air pressure detection assembly 200 is abutted and sealed against one end of the installation cavity 140 near the air pressure detection cavity 110 to form a second seal, thereby further improving the sealing effect, and further improving the detection accuracy and stability of the air pressure detection assembly 200.

[0054] In some embodiments, see Figures 1 to 4 The housing 100 includes a first shell 150 and a second shell 160 connected to each other; the piston chamber 130 is formed in the second shell 160; the air pressure detection chamber 110 is formed by the first shell 150 and the second shell 160; and a receiving chamber connected to the piston chamber 130 is formed in the first shell 150.

[0055] It can be understood that by dividing the shell 100 into a first shell 150 and a second shell 160, a modular design is achieved, so that the accommodating cavity in the first shell 150 can be used for installing other components of the pipetting device, and the second shell 160 is used for installing the air pressure detection component 200, thereby improving the rationality of the layout and allowing the air pressure detection component 200 to be set close to the detection end on the pipetting device, reducing the length of the detection channel 120, and improving the efficiency and accuracy of air pressure detection.

[0056] In some embodiments, see Figures 1 to 4 The first shell 150 is formed with a connecting channel 151, and the two ends of the connecting channel 151 are respectively connected to the air pressure detection chamber 110 and the accommodating chamber; the air pressure detection assembly 200 includes an air pressure sensor 210 and a control board 220; the air pressure sensor 210 is electrically connected to the control board 220, and the detection end of the air pressure sensor 210 is arranged toward the detection channel 120; one end of the control board 220 is arranged in the air pressure detection chamber 110, and the other end is arranged in the accommodating chamber through the connecting channel 151, and the cross-sectional area of ​​the control board 220 matches that of the connecting channel 151.

[0057] It can be understood that, on the one hand, the control board 220 can be electrically connected to the main control board in the accommodating cavity, thereby realizing unified control and management of the entire pipetting device; on the other hand, the control board 220 is matched with the cross-sectional area of ​​the connecting channel 151 to make the air pressure detection cavity 110 a sealed space, thereby ensuring the air pressure detection accuracy of the air pressure detection component 200.

[0058] See also Figures 1 to 5 An embodiment of the present application also provides a pipetting device, including the air pressure detection system for the pipetting device as described above.

[0059] In this embodiment, the housing 100 in the air pressure detection system can be used as the housing 100 of a liquid transfer device, and is used for installing components inside the liquid transfer device.

[0060] In practical applications, the gas in the piston chamber 130 can move in a direction close to the air pressure detection chamber 110 through the detection channel 120 , thereby enabling the air pressure detection component 200 to detect the air pressure of the piston chamber 130 .

[0061] It can be understood that since the caliber of the detection channel 120 at one end close to the air pressure detection chamber 110 is larger than the caliber of the detection channel 120 at one end close to the piston chamber 130, on the one hand, the gas resistance flowing from the detection channel 120 to its end close to the air pressure detection chamber 110 can be reduced, so that the gas in the detection channel 120 can flow smoothly and evenly to the air pressure detection component 200, thereby improving the accuracy and stability of the air pressure detection component 200 in detecting the piston chamber 130; on the other hand, the gas flowing in the detection channel 120 to one end of the air pressure detection chamber 110 can flow smoothly to buffer the gas in the detection channel 120, thereby reducing the influence of the gas flow caused by the movement of the piston rod in the piston chamber 130 on the air pressure detection component 200, and further improving the accuracy of the air pressure detection component 200 in detecting the piston chamber 130.

[0062] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. An air pressure detection system for a liquid transfer device, characterized in that: include: The housing is formed with an air pressure detection chamber, a detection channel and a piston chamber which are connected in sequence; the diameter of the detection channel close to one end of the air pressure detection chamber is larger than the diameter of the detection channel close to one end of the piston chamber; the piston chamber is used for the piston rod to move; An air pressure detection component is arranged in the air pressure detection chamber and is used to detect the air pressure of the piston chamber through the detection channel.

2. The air pressure detection system for a liquid transfer device according to claim 1, characterized in that: The detection channel comprises an inlet section, a guide section and an outlet section which are connected in sequence; One end of the inlet section away from the guide section is connected to the air pressure detection chamber; The guide section is used to guide the gas in the inlet section to the outlet section; One end of the outflow section away from the guide section is communicated with the piston cavity, and the caliber of the outflow section is larger than the caliber of the inflow section.

3. The air pressure detection system for a liquid transfer device according to claim 2, characterized in that: The caliber of the flow guide section increases gradually along the direction from the inlet section to the outlet section.

4. The air pressure detection system for a liquid transfer device according to claim 1, characterized in that: The caliber of the detection channel increases gradually along the direction from the piston cavity toward the air pressure detection cavity.

5. The air pressure detection system for a liquid transfer device according to any one of claims 1 to 4, characterized in that: The detection end of the air pressure detection component is arranged in one end of the detection channel close to the air pressure detection cavity.

6. The air pressure detection system for a liquid transfer device according to claim 5, characterized in that: The air pressure detection system also includes a sealing member; The detection end of the air pressure detection assembly is sealed and connected to an end of the detection channel close to the air pressure detection cavity through the sealing member.

7. The air pressure detection system for a liquid transfer device according to claim 6, characterized in that: The housing is also formed with an installation cavity, and the two ends of the installation cavity are respectively connected with the air pressure detection cavity and an end of the detection channel close to the air pressure detection cavity; wherein: The sealing member is arranged in the installation cavity; and / or, The air pressure detection component is abutted and sealed against one end of the installation cavity close to the air pressure detection cavity.

8. The air pressure detection system for a liquid transfer device according to any one of claims 1 to 4, characterized in that: The housing comprises a first housing and a second housing connected to each other; The piston chamber is formed in the second housing; The air pressure detection chamber is formed by enclosing the first shell and the second shell; An accommodating cavity communicated with the piston cavity is formed in the first shell.

9. The air pressure detection system for a liquid transfer device according to claim 8, characterized in that: The first housing is formed with a communication channel, and two ends of the communication channel are respectively communicated with the air pressure detection chamber and the accommodating chamber; The air pressure detection component includes an air pressure sensor and a control board; the air pressure sensor is electrically connected to the control board, and the detection end of the air pressure sensor is arranged toward the detection channel; one end of the control board is arranged in the air pressure detection cavity, and the other end is arranged in the accommodating cavity through the connecting channel, and the cross-sectional area of ​​the control board matches that of the connecting channel.

10. A liquid transfer device, characterized in that: The invention comprises an air pressure detection system for a liquid transfer device according to any one of claims 1 to 9.

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