Device for detecting substances in liquid

Abstract

The utility model provides a device for detecting substances in liquid. The device for detecting the substances in the liquid comprises a reagent strip and a first connecting part, a clamping groove and a second connecting part are formed in the first connecting part in the first direction, and a sample adding hole is formed in the second connecting part; a flow guide channel is formed in the second connecting part and located in the second connecting part, the first connecting part can be an insertion plate, and the second connecting part can be a cover sleeve. The insertion plate is inserted into the cover sleeve, the cover sleeve is flatly placed, then a sample is dropped from the sample adding hole, flows into the cover sleeve and flows to the reagent strip along the flow guide surface, so that the sample is absorbed by the glass fiber end on the reagent strip, a liquid storage space is reserved in the cover sleeve, and part of the sample which is not absorbed stays on the flow guide surface and is gradually absorbed by the reagent strip; therefore, the sample can be absorbed by the reagent strip only by adding the sample into the sample adding hole in the cover sleeve once, and the dropwise adding time is short and can be completed within 1-2 seconds.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of detection, and in particular, to a device for detecting a substance in a liquid. BACKGROUND

[0002] In our society, drug abuse has become a recognized and worsening social problem. In order to combat the social problem of drug abuse, drug testing has become a standard detection procedure in the industries of employment, education, sports, law enforcement, etc. In order to promote the progress of the standard detection procedure, various drug testing products have appeared.

[0003] These drug testing products include one or more test reagent strips, such detection devices are relatively convenient, and the detection results can be obtained on the test reagent strips in one minute or at most about ten minutes.

[0004] In these detection devices, the test reagent strips are generally arranged on a carrier, such as a plug, which is provided with clamping grooves, and each clamping groove can accommodate a test reagent strip. In detection, the plug is inserted into urine, so that the plurality of test reagent strips are in contact with the urine, and the detection results are observed after waiting for one to ten minutes.

[0005] However, the reagent strips are prone to contamination during the waiting process, which affects the detection results. Moreover, the reagent strips are inserted into the urine with the plug, and the plug needs to be pulled out after waiting for 1 second, and the detection results are observed. If the amount of sample to be detected is large, the plug needs to be inserted into the sample constantly, and the overall required time is long and the operation is complicated. CONTENT OF THE INVENTION

[0006] The present disclosure provides a device for detecting a substance in a liquid to at least solve the above technical problems existing in the prior art.

[0007] According to a first aspect of the present disclosure, a device for detecting a substance in a liquid is provided, the device for detecting a substance in a liquid comprising,

[0008] a reagent strip, the reagent strip comprising an absorption portion, the absorption portion being located at one end of the reagent strip along a first direction;

[0009] a first connecting portion, the first connecting portion being provided with a clamping groove in the first direction, and the reagent strip being located in the clamping groove;

[0010] a second connecting portion, the second connecting portion being connected with the first connecting portion, and the second connecting portion being provided with a sample addition hole; wherein,

[0011] The second connecting part is provided with a flow guide channel, the flow guide channel is located in the second connecting part, the sample adding hole and the clamping groove are respectively located at two ends of the flow guide channel along the first direction, so as to guide the sample in the sample adding hole to the clamping groove through the flow guide channel, the first connecting part can be a plugboard, and the second connecting part can be a cover sleeve.

[0012] In an embodiment, the device for detecting substances in a liquid comprises a third connecting part, the first connecting part is connected with the second connecting part through the third connecting part, the clamping groove extends into the third connecting part along the first direction, and the clamping groove is at least partially located in the second connecting part.

[0013] In an embodiment, the device for detecting substances in a liquid comprises a liquid guide layer, the liquid guide layer is connected with the flow guide channel and the reagent strip respectively, so as to guide the sample in the flow guide channel to the reagent strip.

[0014] In an embodiment, the third connecting part has a first surface on one side along a second direction, the device for detecting substances in a liquid has a first plane arranged along the first direction, the device for detecting substances in a liquid has two third connecting parts, the two third connecting parts are respectively located on two sides of the first plane, the first surfaces of the two third connecting parts are arranged towards the first plane, and a first area is formed between the first surfaces of the two third connecting parts, the first area is in communication with the flow guide channel and the clamping groove respectively.

[0015] In an embodiment, the first connecting part has a second surface on one side along the first direction, the second surfaces of the two first connecting parts abut each other, a first distance is formed between the first surface and the first plane, a second distance is formed between the second surface and the first plane, and the second distance is smaller than the first distance.

[0016] In an embodiment, the first connecting part has a second surface on one side along the first direction, and the clamping groove extends into the first connecting part from the second surface.

[0017] In an embodiment, the device for detecting substances in a liquid further comprises a separation sheet, the separation sheet is attached to the second surface, so as to limit the reagent strip in the clamping groove.

[0018] In an embodiment, the device for detecting substances in a liquid further comprises a first connecting member, the third connecting part is connected with the second connecting part through the first connecting member; wherein the first connecting member comprises,

[0019] a first connecting structure, the first connecting structure is located on the third connecting part;

[0020] The second connecting structure is located on the second connecting part, and the first connecting part is detachably connected with the second connecting part.

[0021] In an embodiment, the first connecting part and the third connecting part are misaligned in a second direction to form an abutting surface, and the abutting surface abuts against the second connecting part when the third connecting part is inserted into the second connecting part.

[0022] In an embodiment, the third connecting part is provided with an exhaust groove, and the exhaust groove extends to the side surface of the third connecting part on both sides, and the exhaust groove is in communication with the clamping groove.

[0023] Compared with the prior art, the device for detecting substances in a liquid has the following beneficial effects: a plug is inserted into a cover sleeve, the cover sleeve is laid flat, then a sample is added from a sample adding hole, the sample flows into the cover sleeve, flows along a flow guide channel to a reagent strip, and is absorbed by an absorption part on the reagent strip, wherein part of the sample that is not absorbed will stay in the flow guide channel and be gradually absorbed by the reagent strip, so that the reagent strip can complete the absorption of the sample by adding the sample into the sample adding hole of the cover sleeve only once, and the time for adding the sample is short, which can be completed within 1-2 seconds, and the operation is simple and fast.

[0024] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings. In the drawings, several embodiments of the present disclosure are shown by way of example and not limitation, in which:

[0026] In the drawings, the same or corresponding reference numerals refer to the same or corresponding parts.

[0027] Figure 1 A body composition diagram of an embodiment of the present disclosure is shown;

[0028] Figure 2 A body development diagram of an embodiment of the present disclosure is shown;

[0029] Figure 3 A cover sleeve structure diagram of an embodiment of the present disclosure is shown;

[0030] Figure 4 A body cross-sectional view of an embodiment of the present disclosure is shown;

[0031] Figure 5 A body development diagram of an embodiment of the present disclosure is shown;

[0032] Figure 6 A full section view of the body structure of the second embodiment of the present disclosure is shown;

[0033] Figure 7 An exploded view of the body structure of the second embodiment of the present disclosure is shown;

[0034] Figure 8 A schematic view of the cover sleeve structure of the second embodiment of the present disclosure is shown;

[0035] Figure 9 An expanded view of the body structure of the sixth embodiment of the present disclosure is shown;

[0036] Figure 10 A section view of the body structure of the sixth embodiment of the present disclosure is shown.

[0037] Explanation of figure numbers:

[0038] 100, reagent strip; 101, absorption part;

[0039] 200, first connecting part; 201, clamping groove; 202, first surface; 203, second surface; 204, water-permeable hole; 205, through groove; 206, exhaust groove; 207, positioning hole; 208, positioning column;

[0040] 300, second connecting part; 301, sample hole; 302, flow guide channel;

[0041] 400, third connecting part;

[0042] 500, liquid guide layer;

[0043] 600, first area;

[0044] 700, isolation sheet;

[0045] 800, first connecting member; 801, first connecting structure; 802, second connecting structure;

[0046] 900, abutting surface. DETAILED DESCRIPTION

[0047] In order to make the purpose, features and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present disclosure.

[0048] Drug abuse has become a recognized and worsening social problem in our society. In order to combat drug abuse and monitor this social problem, drug testing has become a standard testing procedure in various industries such as employment, education, sports, law enforcement, etc. To further this effort, a drug testing industry has developed. This industry provides a wide variety of drug testing products.

[0049] These testing devices include one or more test strips. Such testing devices are convenient in that a test result can be obtained on the test strip in one minute or up to about ten minutes.

[0050] In these testing devices, the test strips are generally provided on a carrier such as a plug board having slots each of which can accommodate a test strip. In testing, the plug board is inserted into urine so that the test strips are in contact with the urine and are left to stand for one to ten minutes, and the test result is observed.

[0051] However, the test strips can be contaminated during the standing period, which can affect the test result. Further, the test strips are inserted into the urine together with the plug board, and the plug board is pulled out after one second and the test result is observed. If the amount of sample to be tested is large, the plug board must be repeatedly inserted into and pulled out of the sample, which is time-consuming and cumbersome.

[0052] Embodiment One

[0053] Referring to Figure 1 and Figure 2 , the present disclosure provides a device for detecting a substance in a liquid, which includes a test strip 100 mainly used for absorbing a sample and testing the sample. The test strip 100 includes an absorbing portion 101 (i.e., a liquid absorbing portion) located at one end of the test strip 100 in a first direction, which is a length direction of the test strip 100.

[0054] Referring to Figure 1 and Figure 2 , the present disclosure provides a device for detecting a substance in a liquid, which includes a test strip 100 mainly used for absorbing a sample and testing the sample. The test strip 100 includes an absorbing portion 101 (i.e., a liquid absorbing portion) located at one end of the test strip 100 in a first direction, which is a length direction of the test strip 100.

[0055] A second connecting portion 300 is connected to the first connecting portion 200, and the second connecting portion 300 is provided with a sample adding hole 301. The sample adding hole 301 is mainly used for dropping a sample. The first connecting portion 200 can be a plug board, and the second connecting portion 300 can be a cover sleeve matched with the plug board.

[0056] Please refer to Figure 2 and Figure 3 Wherein, the second connecting part 300 is provided with a flow guide channel 302, the flow guide channel 302 is located in the second connecting part 300, and the sample adding hole 301 and the clamping groove 201 are respectively located at two ends of the flow guide channel 302 along the first direction, so as to guide the sample in the sample adding hole 301 to the clamping groove 201 through the flow guide channel 302.

[0057] When the sample needs to be detected, the sample is added to the sample adding hole 301, the sample in the sample adding hole 301 is guided to the clamping groove 201 through the flow guide channel 302 in the second connecting part 300, and the water absorption part on the reagent strip 100 in the clamping groove 201 is contacted with the sample, so as to absorb the sample and detect the sample. The above operation only needs to add the sample once to wait for the result, and the time consumed by the adding is short, which can be completed within 1-2 seconds, which is convenient and fast.

[0058] Please refer to Figure 3 and Figure 4 Wherein, the flow guide channel 302 can be formed by a cavity provided in the second connecting part 300, the cavity is communicated with the sample adding hole 301, and a flow guide plate is arranged in the cavity to facilitate the flow of the sample in the cavity. When the second connecting part 300 (i.e. the cover sleeve) is placed horizontally, the upper side of the flow guide plate is inclined relative to the horizontal direction, the projection of the sample adding hole 301 along the vertical direction is located in the projection of the upper side of the flow guide plate along the vertical direction, and the bottom end of the flow guide plate is located at the clamping groove 201.

[0059] The second connecting part 300 (i.e. the cover sleeve) is placed horizontally, then the sample is added from the sample adding hole 301, the sample flows into the cavity of the second connecting part 300, and then flows along the upper side of the flow guide plate to the reagent strip 100 in the clamping groove 201, so as to be absorbed by the absorption part 101 on the reagent strip 100. Wherein, the cavity in the first connecting part 200 is provided with a liquid storage space, and part of the sample not absorbed will stay on the flow guide plate and be gradually absorbed by the reagent strip 100, so that the reagent strip 100 can complete the absorption of the sample only by adding the sample to the sample adding hole 301 once, and the time consumed by the adding is short, which can be completed within 1-2 seconds.

[0060] Please refer to Figure 2 and Figure 4 The device for detecting substances in a liquid further comprises a third connecting part 400, the first connecting part 200 is connected with the second connecting part 300 through the third connecting part 400, the clamping groove 201 extends to the third connecting part 400 along the first direction, and the clamping groove 201 is at least partially located in the second connecting part 300. Wherein, the third connecting part 400 can be understood as an extension of the first connecting part 200 (the plug) in the second connecting part 300 (the cover sleeve), and the first connecting part 200 and the third connecting part 400 can be regarded as a whole.

[0061] The first connecting part 200 and the second connecting part 300 are connected through the third connecting part 400, the card slot 201 extends into the second connecting part 300, thereby reducing external pollution, facilitating the flow guiding of the flow guiding channel 302, and making the dropwise sample and the flow guided sample operate in the second connecting part 300, which not only improves the detection efficiency, but also ensures the neatness and safety of the operation process.

[0062] Please refer to Figure 2 and Figure 4 The first connecting part 200 has a second surface 203 on one side in the first direction, and the card slot 201 extends into the first connecting part 200 from the second surface 203. The device for detecting substances in a liquid further comprises a separation sheet 700, which is attached to the second surface 203 to limit the reagent strip 100 in the card slot 201. The separation sheet 700 can be an adhesive sticker, which is mainly used to fix the reagent strip 100, help the running plate, and prevent the reagent strip 100 from coming out of the card slot 201. In addition, the adhesive sticker has other functions, such as information marking and isolating the reagent strips on the two plug-in plates.

[0063] Please refer to Figure 2 and Figure 4 The device for detecting substances in a liquid further comprises a first connecting piece 800, and the third connecting part 400 is connected with the second connecting part 300 through the first connecting piece 800. The first connecting piece 800 comprises a first connecting structure 801 located on the third connecting part 400, and a second connecting structure 802 located on the second connecting part 300, and the first connecting part 200 and the second connecting part 300 are detachably connected.

[0064] The first connecting structure 801 is a protrusion, and the second connecting structure 802 is the inner wall of the second connecting part 300. When the first connecting part 200 is connected with the second connecting part 300, the protrusion abuts against the inner wall of the second connecting part 300, and the friction between the protrusion and the inner wall of the second connecting part 300 limits the first connecting part 200 and the second connecting part 300, so that the first connecting part 200 and the second connecting part 300 are difficult to separate.

[0065] The first connecting part 200 and the third connecting part 400 are misaligned in the second direction to form an abutting surface 900, and the abutting surface 900 abuts against the second connecting part 300 when the third connecting part 400 is inserted into the second connecting part 300. The abutting surface 900 and the second connecting part 300 abut against each other, thereby limiting the depth of the third connecting part 400 inserted into the second connecting part 300.

[0066] Embodiment two:

[0067] Please refer to Figure 5 andFigure 6 On the basis of embodiment one, the device for detecting substances in liquid comprises a liquid guide layer 500, which is connected with the flow guide channel 302 and the reagent strip 100 respectively, so as to guide the sample in the flow guide channel 302 to the reagent strip 100. The sample is ensured to enter the absorption part 101 on the reagent strip 100 correctly. The liquid guide layer 500 can be a polyester film, which is used to absorb the sample and guide the sample to the reagent strip 100.

[0068] After the sample is added to the sample adding hole 301, the sample flows along the flow guide channel 302 to the direction of the liquid guide layer 500, that is, the polyester film, and is absorbed by the polyester film. Since the polyester film is connected with the reagent strip 100, that is, the water absorption part on the reagent strip 100 is connected with the polyester film, the water absorption part on the reagent strip 100 will absorb the sample from the polyester film, so that the sample absorbed by the polyester film is quickly transmitted to each reagent strip 100, and the detection rate is accelerated.

[0069] Embodiment three:

[0070] Please refer to Figure 7 and Figure 8 On the basis of embodiment one, the first surface 202 of the third connecting part 400 of the device for detecting substances in liquid along one side of the second direction has a first surface 202, wherein the second direction is the width direction of the first connecting part 200, that is, the direction perpendicular to the first direction. The device for detecting substances in liquid has a first plane arranged along the first direction, and the device for detecting substances in liquid has two third connecting parts 400, which are respectively located on both sides of the first plane. The first surfaces 202 of the two third connecting parts 400 are arranged towards the first plane, and the first surfaces 202 of the two third connecting parts 400 form a first area 600 therebetween. The first area 600 is respectively communicated with the flow guide channel 302 and the clamping groove 201.

[0071] The third connecting part 400 has two third connecting parts 400, and the first area 600 is formed between the two third connecting parts 400. The gap of the first area 600 is small. After the sample is added to the sample adding hole 301, the sample flows along the flow guide channel 302 to the direction of the first area 600, and flows into the first area 600. Since the gap of the first area 600 between the two third connecting parts 400 is small, the capillary phenomenon occurs. Due to the capillary effect, the sample will continuously transport the sample to the clamping groove 201 through the first area 600 between the two third connecting parts 400, so as to flow to the absorption on the reagent strip 100, and achieve the purpose of running the plate.

[0072] The second surface 203 of the first connecting part 200 is located on one side of the first connecting part 200 along the first direction, and the second surfaces 203 of the two first connecting parts 200 abut each other, the first surface 202 and the first plane form a first distance, the second surface 203 and the first plane form a second distance, and the second distance is smaller than the first distance. Wherein, because the second surfaces 203 of the two first connecting parts 200 abut each other, the loss of the sample from the two first connecting parts 200 is reduced, and because the second distance is smaller than the first distance, the first distance is not zero, and the first surfaces 202 between the two third connecting parts 400 form a gap, which is convenient for forming capillary action.

[0073] Embodiment four

[0074] A device for detecting a substance in a liquid, comprising a reagent strip 100, mainly used for absorbing a sample and detecting the sample, the reagent strip 100 comprising an absorption part 101 (i.e. a liquid absorption part), the absorption part 101 being located at one end of the reagent strip 100 along a first direction, wherein the first direction is the length direction of the reagent strip 100.

[0075] Please refer to Figure 2 and Figure 4 Further comprising a first connecting part 200, the first connecting part 200 being provided with a clamping groove 201 along the first direction, and the reagent strip 100 being located in the clamping groove 201; the reagent strip 100 is limited by the clamping groove 201, so as to ensure the stability of the reagent strip 100 during use and reduce the possibility of movement and falling of the reagent strip 100. Wherein the first direction is also the length direction of the first connecting part 200.

[0076] Please refer to Figure 2 Wherein the first connecting part 200 is provided with a water permeable hole 204 on one side, which is in communication with the clamping groove 201, and the water permeable hole 204 is located at the absorption part 101.

[0077] When it is necessary to detect the sample, the end of the first connecting part 200 close to the water permeable hole 204 can be directly inserted into the sample, the sample contacts the absorption part 101 on the reagent strip 100 through the water permeable hole 204, the contact time is about 1 second, the whole absorption part 101 can be completely soaked by the sample to run to the upper layer, and then the detection result can be waited.

[0078] In order to improve the water absorption efficiency of the absorption part 101, a through groove 205 is provided on the side wall of the water permeable hole 204, and the absorption part 101 of the reagent strip 100 is located at the through groove 205. After the first connecting part 200 is inserted into the sample, the absorption part 101 absorbs water, the through groove 205 forms a capillary gap due to the small gap, and the sample at the through groove 205 flows in a capillary manner, so that the sample quickly approaches the reagent strip 100, and a small amount of sample is still left in the through groove 205 after being taken out, which supports the reagent strip to continue to run.

[0079] Example Five

[0080] Referring to Figure 7 and Figure 8 A device for detecting a substance in a liquid includes a reagent strip 100 mainly used for absorbing a sample and detecting the sample, and the reagent strip 100 includes an absorbing part 101 (i.e., an absorbing portion) located at one end of the reagent strip 100 along a first direction, wherein the first direction is a length direction of the reagent strip 100.

[0081] The device further includes a first connecting part 200, and the first connecting part 200 is provided with a clamping groove 201 along the first direction, and the reagent strip 100 is located in the clamping groove 201; the reagent strip 100 is limited by the clamping groove 201, so as to ensure the stability of the reagent strip 100 during use and reduce the possibility of movement and falling of the reagent strip 100. The first connecting part 200 is provided with an exhaust groove 206 on one side of the clamping groove 201, and the exhaust groove 206 extends to the side surface of a third connecting part 400 on both sides, and the exhaust groove 206 is in communication with the clamping groove 201. The first direction is also a length direction of the first connecting part 200.

[0082] When the sample needs to be detected, one end of the first connecting part 200 close to the exhaust groove 206 is inserted into the sample, so that the exhaust groove 206 is completely immersed in the sample. Since the exhaust groove 206 is in communication with each clamping groove 201, the sample will flow into each clamping groove 201 and contact the glass fiber end 201 on the reagent strip 200 in the clamping groove 201, and the contact time is about 1 second. The whole glass fiber end 201 can be completely immersed in the sample to run up to the upper chromatography platform, and then the detection result can be waited.

[0083] Example Six

[0084] Referring to Figure 9 and Figure 10 On the basis of example one, the first connecting part 200 has two, and one of the first connecting parts 200 is provided with at least two positioning holes 207, and the other first connecting part 200 is provided with a positioning column 208 matched with the two positioning holes 207. When the reagent strips 100 on the two first connecting parts 200 need to absorb the sample at the same time, the two first connecting parts 200 can be stably connected into one by the precise matching of the positioning column 208 and the positioning hole 207, and then the sample is transported for detection, so that the detection can be carried out as a whole, which not only increases the convenience of detection, but also improves the detection rate.

[0085] It should be understood that the various forms of flow shown above can be used to reorder, add, or delete steps. For example, the steps described in the present disclosure can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved, which is not limited herein.

[0086] In addition, the terms "first", "second", are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0087] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A device for detecting substances in a liquid, characterized in that, The device for detecting substances in a liquid includes, A reagent strip (100) includes an absorption section (101) located at one end of the reagent strip (100) along a first direction; A first connecting part (200) is provided with a slot (201) along the first direction, and the reagent strip (100) is located in the slot (201); A second connecting part (300) is connected to the first connecting part (200), and a sample feeding hole (301) is provided on the second connecting part (300); wherein, The second connecting part (300) is provided with a flow guiding channel (302). The flow guiding channel (302) is located in the second connecting part (300). The sample application hole (301) and the card slot (201) are respectively located at both ends of the flow guiding channel (302) along the first direction, so as to guide the sample in the sample application hole (301) to the card slot (201) through the flow guiding channel (302).

2. The apparatus for detecting substances in a liquid according to claim 1, characterized in that, The device for detecting substances in a liquid includes, The third connecting part (400) is connected to the second connecting part (300) through the third connecting part (400), the slot (201) extends into the third connecting part (400) along the first direction, and the slot (201) is at least partially located in the second connecting part (300).

3. The apparatus for detecting substances in a liquid according to claim 2, characterized in that, The device for detecting substances in a liquid includes, A liquid guiding layer (500) is connected to the flow guiding channel (302) and the reagent strip (100) respectively, so as to guide the sample in the flow guiding channel (302) to the reagent strip (100).

4. The apparatus for detecting substances in a liquid according to claim 2, characterized in that, The third connecting part (400) has a first surface (202) on one side along the second direction. The device for detecting substances in liquid has a first plane arranged along the first direction. The device for detecting substances in liquid has two third connecting parts (400). The two third connecting parts (400) are respectively located on both sides of the first plane. The first surfaces (202) of the two third connecting parts (400) are facing the first plane. A first region (600) is formed between the first surfaces (202) of the two third connecting parts (400). The first region (600) is connected to the flow channel (302) and the slot (201) respectively.

5. The apparatus for detecting substances in a liquid according to claim 4, characterized in that, The first connecting portion (200) has a second surface (203) on one side along the first direction. The second surfaces (203) of the two first connecting portions (200) abut each other. A first gap is formed between the first surface (202) and the first plane. A second gap is formed between the second surface (203) and the first plane. The second gap is smaller than the first gap.

6. The apparatus for detecting substances in a liquid according to claim 1, characterized in that, The first connecting portion (200) has a second surface (203) on one side along the first direction, and the slot (201) extends from the second surface (203) into the first connecting portion (200).

7. The apparatus for detecting substances in a liquid according to claim 6, characterized in that, The apparatus for detecting substances in a liquid further includes a separator (700) that is attached to the second surface (203) to confine the reagent strip (100) within the slot (201).

8. The apparatus for detecting substances in a liquid according to claim 2, characterized in that, The device for detecting substances in a liquid also includes, A first connector (800) is provided, wherein the third connector (400) is connected to the second connector (300) via the first connector (800); wherein the first connector (800) comprises, A first connecting structure (801) is located on the third connecting part (400); The second connecting structure (802) is located on the second connecting part (300), and the first connecting part (200) and the second connecting part (300) are detachably connected.

9. The apparatus for detecting substances in a liquid according to claim 2, characterized in that, The first connecting part (200) and the third connecting part (400) are offset along the second direction to form an abutting surface (900). When the third connecting part (400) is inserted into the second connecting part (300), the abutting surface (900) abuts against the second connecting part (300).

10. The apparatus for detecting substances in a liquid according to claim 2, characterized in that, The third connecting part is provided with an exhaust groove (206), which extends to the side of the third connecting part (400) on both sides, and the exhaust groove (206) is connected to the slot (201).

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