CN215768439U - Titration apparatus - Google Patents

Abstract

The embodiment of the utility model discloses a titration apparatus, comprising: the first titration tube comprises a first tube body, the first tube body is provided with a first liquid inlet end and a first liquid outlet end, and a first scale mark is arranged between the first liquid inlet end and the first liquid outlet end on the first tube body; the second burette comprises a second pipe body fixedly connected with the first pipe body, the second pipe body is provided with a second liquid inlet end and a second liquid outlet end, the shaft diameter of the second pipe body is smaller than that of the first pipe body, the second pipe body is provided with second scale marks, and the distance between every two adjacent scale marks on the first scale marks is smaller than that between every two adjacent scale marks on the second scale marks; and the flow control structure is arranged on the second pipe body and can control the flow speed of the liquid in the second pipe body. Through the arrangement, when the titration apparatus provided by the utility model is utilized, the flow rate of the titration liquid can be controlled, the liquid output amount can be conveniently mastered, and the titration is more accurate.

Description

Titration apparatus

Technical Field

The utility model relates to the technical field of titration analysis, in particular to a titration apparatus.

Background

Burettes, which are the primary meters used in titrimetry, are commonly used in laboratories. The tube body of the traditional burette is made of a glass tube with uniform inner diameter and accurate scales, the lower end of the burette is provided with a liquid outlet end, and the scale marks on the tube body are often required to be observed to confirm the accuracy of titration when a certain amount of titration liquid is titrated.

However, when the titration tube is used to titrate a titration solution, it is difficult to accurately stop the liquid level of the titration solution on a scale line that can reflect a required amount of solution when the titration solution approaches the scale line that can reflect the required amount of solution, which may cause a problem of excessive titration, resulting in inaccurate titration results.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a titration apparatus with high titration accuracy.

The embodiment of the utility model provides a titration apparatus, which comprises:

the first burette comprises a first pipe body, the first pipe body is provided with a first liquid inlet end and a first liquid outlet end, and a first scale mark is arranged between the first liquid inlet end and the first liquid outlet end on the first pipe body;

the second burette comprises a second pipe body fixedly connected with the first pipe body, the second pipe body is provided with a second liquid inlet end and a second liquid outlet end, the shaft diameter of the second pipe body is smaller than that of the first pipe body, the second pipe body is provided with second scale marks, and the distance between every two adjacent scale marks on the first scale mark is smaller than that between every two adjacent scale marks on the second scale mark; and

and the flow control structure is arranged on the second pipe body and can control the flow speed of the liquid in the second pipe body.

In some embodiments of the titration apparatus, a piston structure is disposed on the first liquid outlet end, the piston structure includes a piston sleeve fixedly connected to the first liquid outlet end, a piston rod inserted and fitted in the piston sleeve, and a fixing nut in threaded connection with an end of the piston rod, the piston sleeve is communicated with the first liquid outlet end, a passage hole penetrates through the piston rod in a direction perpendicular to the piston rod, and the passage hole can be communicated with the first liquid outlet end by rotating the piston rod.

In some embodiments of the titration apparatus, a clamping pad is convexly arranged on the peripheral wall of the piston rod, and the clamping pad abuts against the inner wall of the piston sleeve when the piston rod is inserted into the piston sleeve.

In some embodiments of the titration apparatus, at least a portion of the second inlet leads into the first tube, and the second inlet communicates with the first tube at a location between the minimum scale of the first scale mark and the first inlet.

In some embodiments of the titration apparatus, an end of the second pipe body, which is far away from the second liquid inlet end, is bent back to the first pipe body to form the second liquid outlet end, a connection assembly is disposed between the second liquid outlet end and the flow limiting member, and liquid enters the flow limiting member from the second pipe body through the connection assembly.

In some embodiments of the titration apparatus, the connection assembly comprises a first connection member and a second connection member, the first connection member has a first connection end and a second connection end, the first connection end is sleeved on at least a part of the second liquid outlet end, one end of the second connection member is sleeved on the second connection end, and the other end of the second connection member is sleeved on one end of the flow restriction member.

In some embodiments of the titration apparatus, an inner convex ring is disposed on an inner wall of the first connection end, a groove is disposed on an outer wall of the second liquid outlet end, and when the first connection end is sleeved on the second liquid outlet end, the inner convex ring is clamped in the groove.

In some embodiments of the titration apparatus, the flow restriction member is a needle tube, a handle is disposed on an outer wall of the flow restriction member for facilitating taking the flow restriction member, a sealing ring is further disposed on an outer wall of one end of the flow restriction member connected to the second connecting member, and the second connecting member is sleeved on the sealing ring.

In some embodiments of the titration apparatus, the flow control structure comprises a mounting base, a movable groove is arranged on the mounting base, and a roller is movably arranged in the movable groove;

the second connecting piece is an elastic hose, the second connecting piece penetrates through the movable groove, the second connecting piece is located between the groove bottom of the movable groove and the roller, and the roller can gradually abut against the second connecting piece in the moving process.

In some embodiments of the titration apparatus, the roller is provided with a connecting rod disposed oppositely, two opposite side walls of the movable groove are both provided with a sliding groove, and the connecting rod is movably disposed in the sliding groove.

In some embodiments of the titration apparatus, the peripheral wall of the first inlet end extends outwardly in a trumpet shape.

In some embodiments of the titration apparatus, a connection block is disposed between the second tube and the first tube, and two ends of the connection block are respectively and fixedly connected to the first tube and the second tube.

The embodiment of the utility model has the following beneficial effects:

during the titration, earlier titrate with first buret, reuse second buret when being close to the scale mark that can reflect required liquid measure and titrate, come the velocity of flow that control titrated through flow control structure for the velocity of flow of liquid step down in the second buret, the liquid level decline of the titration in the second body is slower, more is favorable to mastering out the liquid measure. When the liquid in the second burette is close to the scale mark capable of reflecting the required liquid amount, the distance between two adjacent scale marks on the second scale mark is larger than the distance between two adjacent scale marks on the first scale mark, so that the working personnel can more easily determine whether the liquid surface reaches the scale mark of the required liquid amount, and the obtained titration amount is more accurate.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Wherein:

FIG. 1 is a schematic structural diagram of a titration apparatus provided in accordance with an embodiment of the present invention;

FIG. 2 illustrates a front view of a titration apparatus provided in accordance with an embodiment of the present invention;

FIG. 3 shows a cross-sectional view of a titration apparatus provided in accordance with an embodiment of the present invention;

FIG. 4 shows an enlarged partial schematic view at A in FIG. 3;

FIG. 5 illustrates a cross-sectional view of a first connector of a titration apparatus according to an embodiment of the present disclosure;

FIG. 6 shows an enlarged partial schematic view at B in FIG. 3;

FIG. 7 shows a schematic diagram of a flow restriction of a titration apparatus according to an embodiment of the present invention;

FIG. 8 shows an enlarged partial schematic view at C in FIG. 2;

fig. 9 is a schematic structural diagram illustrating a flow control structure of a titration apparatus according to an embodiment of the present invention.

Description of the main element symbols:

1. a first burette; 10. a first pipe body; 11. a first liquid inlet end; 12. a first liquid outlet end; 13. a first scale mark; 14. connecting blocks; 2. a second burette; 20. a second tube body; 21. a second liquid inlet end; 22. a second liquid outlet end; 220. a groove; 23. a flow restriction; 230. a handle; 231. a seal ring; 24. a second scale mark; 3. a flow control structure; 30. a mounting seat; 31. a movable groove; 32. a roller; 33. a connecting rod; 34. a sliding groove; 4. a piston structure; 40. a piston sleeve; 41. a piston rod; 410. a passage hole; 42. fixing a nut; 43. a clamping pad; 5. a connecting assembly; 50. a first connecting member; 500. a first connection end; 501. a second connection end; 502. an inner collar; 503. a ring groove; 51. a second connecting member.

Detailed Description

To facilitate an understanding of the utility model, the utility model will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The embodiment of the utility model provides a titration apparatus, which can control the flow rate of a titration solution, and meanwhile, the distance between adjacent scale marks on the titration apparatus is relatively large, so that whether the liquid level of the titration solution stays on the corresponding scale mark can be more conveniently observed, and the titration accuracy can be further increased.

Specifically, in one embodiment, referring to fig. 1 and 2, the titration apparatus includes a first burette 1, a second burette 2, and a flow control structure 3. The first burette 1 comprises a first pipe body 10, one end of the first pipe body 10 is provided with a first liquid inlet end 11, the other end of the first pipe body is provided with a first liquid outlet end 12, liquid enters the first pipe body 10 from the first liquid inlet end 11, and then the liquid can flow out of the first pipe body 10 from the first liquid outlet end 12. It should be noted that, still be equipped with first scale mark 13 on the first body 10, first scale mark 13 is located between first feed inlet end 11 and the first play liquid end 12, and the one end that first scale mark 13 is close to first feed inlet end 11 is initial scale "0" scale, and first scale mark 13 extends the setting towards first play liquid end 12 from first feed inlet end 11.

It should be noted that, when the first burette 1 is used for titration, the first liquid outlet end 12 is first closed, and then the titration solution is injected into the first pipe 10, and the injection amount exceeds the scale of "0" of the first scale mark 13. Then, the first liquid outlet end 12 is opened, so that the titration liquid flows out of the first tube body 10 through the first liquid outlet end 12, eyes stare at the liquid level of the titration liquid, when the liquid level of the titration liquid reaches the scale line of '0', the first liquid outlet end 12 is closed, the process is prepared for subsequent titration, the liquid level of the titration liquid is aligned with the scale line of '0', and the range of the scale line of the liquid level drop is the titration volume during the subsequent titration.

In the embodiment of the present invention, the second burette 2 comprises a second pipe body 20 fixedly connected with the first pipe body 10, the second pipe body 20 has a second liquid inlet end 21 and a second liquid outlet end 22, wherein the second liquid outlet end 22 is connected with a flow restriction member 23. The titration liquid can get into second body 20 from second feed liquor end 21, again flows out through second play liquid end 22 and flow restriction piece 23, and the velocity of flow after titration liquid gets into flow restriction piece 23 by second play liquid end 22 reduces, and then makes the liquid level rate of fall of titration liquid in second body 20 reduce.

It should be noted that, the second pipe 20 has a second scale mark 24, the second scale mark 24 is located between the second liquid inlet end 21 and the second liquid outlet end 22, the scale mark of "0" on the second scale mark 24 is located near the second liquid inlet end 21, and the second scale mark 24 extends from the second liquid inlet end 21 to the second liquid outlet end 22. When the second burette 2 is used for titration, it is also necessary to adjust the level of the titration solution to be flush with the "0" scale of the second scale line 24. When the titration solution is titrated to be close to the scale mark corresponding to the required titration amount by using the first titration tube 1, the titration is stopped, and then the titration is carried out by using the second titration tube 2, and the residual required titration solution amount is titrated. Due to the flow restriction 23, the liquid level in the second tube 20 drops at a slower rate, and therefore the position of the liquid level in the second tube 20 is better determined relative to the liquid level in the first tube 10.

In the embodiment of the present invention, the volume of the first tube 10 is greater than the volume of the second tube 20, the first tube 10 and the second tube 20 are both arranged in a cylinder, and the axial diameter of the first tube 10 is greater than the axial diameter of the second tube 20, so that the distance between two adjacent graduation marks on the first graduation mark 13 is smaller than the distance between two adjacent graduation marks on the second graduation mark 24. It should be noted that, in a specific embodiment, the volume of the first tube 10 is greater than 20mL (millilite, mL), and the volume of the first tube 10 is greater than 5 mL. The first scale mark 13 has a measurement range of 20mL, and the second scale mark 24 has a measurement range of 5 mL. The distance between two adjacent graduation lines on the second graduation line 24 should not be too large, nor too small, so as to conveniently see whether the liquid level and the graduation line are overlapped. The distance between two adjacent graduations on the second graduations 24 will generally be set to between two and five times the distance between two adjacent graduations on the first graduations 13. The distance between two adjacent scale marks on the second scale mark 24 is large enough, so that the relationship between the liquid level of the titration liquid and the second scale mark 24 can be conveniently observed, whether the titration liquid coincides with the second scale mark is relatively easy to distinguish, and the titration accuracy of the second burette 2 can be improved.

In the embodiment of the present invention, the titration apparatus further includes a flow control structure 3, the flow control structure 3 is mounted on the second tube 20, and the flow rate of the titration solution in the second tube 20 can be further controlled by the flow control structure 3, so that when the second titration tube 2 is used for titration, when the liquid level of the titration solution approaches to the scale mark corresponding to the remaining required titration solution, the flow rate of the titration solution is reduced again by the flow control structure 3. It should be noted that the flow control structure 3 also serves as a switch valve, and when the liquid level of the titration liquid drops to coincide with the graduation line corresponding to the required liquid amount, the flow control structure 3 is used to close the second liquid outlet end 22, so as to prevent the flow of the titration liquid.

Through the cooperation of the flow control member and the flow control structure 3, the flow rate of the titration liquid in the second tube body 20 can be controlled more easily, so that titration can be stopped conveniently at any time, the distance between two adjacent scale marks on the second scale mark 24 is larger, and it is easier to observe whether the liquid level of the titration liquid is superposed with the scale marks or not, so that the titration accuracy is higher when the titration device provided by the embodiment of the utility model is used for titration.

In a specific embodiment, please refer to fig. 3 and 4, the peripheral wall of the first inlet 11 is flared outward, so that the first inlet 11 is open to a larger extent, which is beneficial for injecting the titration liquid into the first tube 10. The first liquid outlet end 12 is in a circular truncated cone shape, the first liquid outlet end 12 is arranged in a hollow manner, the larger end of the first liquid outlet end 12 is led into one end, far away from the first liquid inlet end 11, of the first pipe body 10, and titration liquid in the first pipe body 10 can flow out from the first liquid outlet end 12. It should be noted that the piston structure 4 is arranged on the first liquid outlet end 12, the piston structure 4 is a switch of the first liquid outlet end 12, and the first liquid outlet end 12 can be opened and closed by using the piston structure 4.

Specifically, the piston structure 4 includes a piston sleeve 40 fixedly connected to the first liquid outlet end 12, a piston rod 41 inserted into the piston sleeve 40, and a fixing nut 42 threadedly connected to an end of the piston rod 41. The piston sleeve 40 is arranged on the first liquid outlet end 12 in a penetrating manner, and the interior of the piston sleeve 40 is communicated with the hollow structure in the first liquid outlet end 12, so that the titration liquid in the first liquid outlet end 12 can pass through the piston sleeve 40. The piston rod 41 is provided with a channel hole 410 through along a direction perpendicular to the piston rod 41, when the piston rod 41 is inserted into the piston sleeve 40, the channel hole 410 is arranged opposite to the first liquid outlet end 12, the channel hole 410 can be communicated with the interior of the first liquid outlet end 12 by rotating the piston rod 41, at the moment, the titration liquid can smoothly flow out, and when the first liquid outlet end 12 needs to be closed, the piston rod 41 is rotated to enable the channel hole 410 to be staggered with the first liquid outlet end 12.

In a more specific embodiment, a clamping pad 43 is protruded from a peripheral wall of one end of the piston rod 41, the clamping pad 43 is made of soft material, and when the piston rod 41 is inserted into the piston sleeve 40, the clamping pad 43 abuts against an inner wall of the piston sleeve 40, so that the piston rod 41 is not easily separated from the piston sleeve 40. After the piston rod 41 is inserted into the piston sleeve 40, the fixing nut 42 is screwed with the end of the piston rod 41, so that the position of the piston rod 41 is more stable.

In a specific embodiment, the length direction of the second tube 20 is parallel to the length direction of the first tube 10, and a plurality of connection blocks 14 are disposed between the second tube 20 and the first tube 10, in the embodiment of the present invention, three connection blocks 14 are illustrated as an example, two ends of each connection block 14 are respectively fixedly connected to the first tube 10 and the second tube 20, and the first tube 10 and the second tube 20 are fixed together through the connection blocks 14. The second liquid inlet end 21 is introduced into the first pipe 10, and the second pipe 20 has a small axial diameter, so that the second liquid inlet end 21 is also small, and if the titration liquid is directly injected from the second liquid inlet end 21, the titration liquid is troublesome and may be spilled. Therefore, the second liquid inlet end 21 is introduced into the first pipe 10, and the titration solution in the first pipe 10 can enter the second pipe 20 from the second liquid inlet end 21. It should be noted that the position where the second liquid inlet end 21 communicates with the first pipe 10 is located between the minimum scale "0" of the first scale mark 13 and the first liquid inlet end 11, the titration liquid is firstly injected into the first pipe 10, when the liquid level of the titration liquid reaches the position of the second liquid inlet end 21, the titration liquid enters the second pipe 20 from the second liquid inlet end 21, and when the liquid level exceeds the second scale mark 24, the injection of the titration liquid is stopped. Before titration, the liquid level of the first tube 10 is adjusted to be level with the 0 scale mark, and then the liquid level of the second tube 20 is adjusted to be level with the 0 scale mark.

In a specific embodiment, referring to fig. 3 to 6, an end of the second pipe 20 away from the second liquid inlet 21 is bent back to the first pipe 10 by an angle of 90 ° to form a second liquid outlet 22, a connection component 5 is disposed between the second liquid outlet 22 and the flow restriction component 23, and the liquid enters the flow restriction component 23 from the inside of the second pipe 20 through the connection component 5.

Specifically, the connecting assembly 5 includes a first connecting member 50 and a second connecting member 51, the first connecting member 50 has a first connecting end 500 and a second connecting end 501, the first connecting end 500 is sleeved on the second liquid outlet end 22, one end of the second connecting member 51 is sleeved on the second connecting end 501, and the other end of the second connecting member 51 is sleeved on one end of the flow limiting member 23. After flowing out of the second liquid outlet end 22, the titration liquid respectively flows out through the first connecting piece 50, the second connecting piece 51 and the flow limiting piece 23.

It should be noted that the inner wall of the first connection end 500 is provided with an inner convex ring 502, the outer wall of the second liquid outlet end 22 is provided with a groove 220, and when the first connection end 500 is sleeved on the second liquid outlet end 22, the inner convex ring 502 is clamped in the groove 220, so that the connection between the first connection end 500 and the second liquid outlet end 22 is more stable. It should be noted that the second connecting member 51 is an elastic hose, the axial diameter of the hose is smaller than the size of the second connecting end 501, a circular groove 503 is formed on the peripheral wall of the second connecting end 501, and when the end of the second connecting member 51 is sleeved on the second connecting end 501, the end is attached to the inner wall of the circular groove 503.

In a more specific embodiment, please refer to fig. 7, the flow restriction member 23 is a thin needle tube, a handle 230 is disposed on an outer wall of the needle tube for facilitating taking the needle tube, a sealing ring 231 is further disposed on an outer wall of an end of the flow restriction member 23 connected to the second connection member 51, the second connection member 51 is sleeved on the sealing ring 231, and the second connection member 51 and the sealing ring 231 are in interference fit.

In an embodiment, referring to fig. 2, 8 and 9, the flow control structure 3 includes a mounting base 30, a movable groove 31 is disposed on the mounting base 30, a roller 32 is movably disposed in the movable groove 31, a second connecting member 51 is disposed in the movable groove 31, and the second connecting member 51 is located between a bottom of the movable groove 31 and the roller 32. External force promotes gyro wheel 32 and can make its inclined motion in activity groove 31, gyro wheel 32 motion in-process can support gradually and press second connecting piece 51, and then can make the inside passageway of second connecting piece 51 diminish gradually, make the velocity of flow of titrating liquid diminish gradually, when gyro wheel 32 moves to the terminal point, can seal second connecting piece 51 inside totally, titrate liquid will not flow, when promoting the gyro wheel 32 motion towards opposite direction, the inside passageway of second connecting piece 51 is opened gradually, titrate liquid and can resume flowing again.

In a specific embodiment, the roller 32 is provided with two oppositely disposed connecting rods 33, and the two connecting rods 33 are welded or bonded to two opposite sidewalls of the roller 32 respectively. The two opposite side walls of the movable groove 31 are provided with sliding grooves 34, the two sliding grooves 34 are located in the same plane, the sliding grooves 34 are obliquely arranged, and a certain angle is formed between the sliding grooves 34 and the bottom of the movable groove 31 and is an acute angle. The end of the connecting rod 33 facing away from the roller 32 is inserted into the sliding groove 34. When the external force pushes the roller 32, the roller 32 drives the connecting rod 33 to move, the connecting rod 33 rolls in the sliding groove 34, and the roller 32 is further forced to move along the opening path of the sliding groove 34. The distance from the lowest end of the sliding groove 34 to the bottom end of the movable groove 31 is less than or equal to the shaft diameter of the roller 32, so that the roller 32 can smoothly close the second connecting piece 51 during the moving process.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. A titration device, comprising:

the first burette comprises a first pipe body, the first pipe body is provided with a first liquid inlet end and a first liquid outlet end, and a first scale mark is arranged between the first liquid inlet end and the first liquid outlet end on the first pipe body;

the second burette comprises a second pipe body fixedly connected with the first pipe body, the second pipe body is provided with a second liquid inlet end and a second liquid outlet end, the shaft diameter of the second pipe body is smaller than that of the first pipe body, the second pipe body is provided with second scale marks, and the distance between every two adjacent scale marks on the first scale mark is smaller than that between every two adjacent scale marks on the second scale mark; and

and the flow control structure is arranged on the second pipe body and can control the flow speed of the liquid in the second pipe body.

2. The titration apparatus according to claim 1, wherein a piston structure is disposed on the first liquid outlet end, the piston structure comprises a piston sleeve fixedly connected to the first liquid outlet end, a piston rod inserted and fitted in the piston sleeve, and a fixing nut threadedly connected to an end of the piston rod, the piston sleeve is communicated with the first liquid outlet end, a passage hole penetrates through the piston rod in a direction perpendicular to the piston rod, and the passage hole can be communicated with the first liquid outlet end by rotating the piston rod.

3. The titration apparatus according to claim 2, wherein a locking pad is protruded from the circumferential wall of the piston rod, and the locking pad abuts against the inner wall of the piston sleeve when the piston rod is inserted into the piston sleeve.

4. The titration apparatus according to claim 1, wherein at least part of the second inlet leads into the first tube, and the second inlet communicates with the first tube at a position between the minimum scale of the first scale mark and the first inlet.

5. The titration apparatus according to claim 4, wherein an end of the second tube body away from the second inlet end is bent back to the first tube body to form the second outlet end, a connection assembly is disposed between the second outlet end and the flow restriction member, and liquid enters the flow restriction member from the second tube body through the connection assembly.

6. The titration apparatus according to claim 5, wherein the connection assembly comprises a first connection member and a second connection member, the first connection member having a first connection end and a second connection end, the first connection end being sleeved on the second liquid outlet end in at least a partial configuration, one end of the second connection member being sleeved on the second connection end, the other end of the second connection member being sleeved on one end of the flow restriction member.

7. The titration apparatus according to claim 6, wherein an inner collar is provided on an inner wall of the first connection end, a groove is provided on an outer wall of the second liquid outlet end, and the inner collar is engaged with the groove when the first connection end is sleeved on the second liquid outlet end.

8. The titration apparatus according to claim 7, wherein the flow restriction member is a needle tube, a handle is provided on an outer wall of the flow restriction member to facilitate taking the flow restriction member, a sealing ring is further provided on an outer wall of an end of the flow restriction member connected to the second connecting member, and the second connecting member is sleeved on the sealing ring.

9. The titration apparatus according to claim 6, wherein the flow control structure comprises a mounting seat, a movable groove is provided on the mounting seat, and a roller is movably provided in the movable groove;

the second connecting piece is an elastic hose, the second connecting piece penetrates through the movable groove, the second connecting piece is located between the groove bottom of the movable groove and the roller, and the roller can gradually abut against the second connecting piece in the moving process.

10. The titration apparatus according to claim 9, wherein the roller is provided with a connecting rod, the connecting rod is disposed opposite to the roller, two opposite side walls of the movable slot are provided with sliding slots, and the connecting rod is movably disposed in the sliding slots.

11. The titration device according to claim 1, wherein the peripheral wall of the first inlet end extends outwardly in a trumpet shape.

12. The titration apparatus according to claim 1, wherein a connection block is disposed between the second tube and the first tube, and two ends of the connection block are respectively and fixedly connected to the first tube and the second tube.

Images