Piston for acid burette

Abstract

The utility model discloses a piston for an acid burette, which comprises an acid burette main body, a cock shell and a piston body are arranged on the acid burette main body, and a limiting component is used for preventing the piston body from loosening and falling off; the limiting assembly comprises an abutting sleeve, the abutting sleeve is arranged at the end of the piston body, a sealing assembly is arranged between the abutting sleeve and the plug cock shell, the two sides of the sealing assembly abut against the sides, close to each other, of the abutting sleeve and the plug cock shell correspondingly, and the end of the piston body and the plug cock shell are sealed through the sealing assembly. The acid burette is reasonable in design structure, the abutting sleeve is arranged at the end of the piston body and limits the piston body through friction force, meanwhile, the sealing assembly is arranged between the abutting sleeve and the cock shell, corrosion caused by liquid leakage in the using process is avoided, and the problems that an existing acid burette rubber band is prone to making contact with some liquid, and the service life of the acid burette is prolonged are solved. And corrosion or breakage is caused, so that the limiting effect on the piston head is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of acid burettes, in particular to a piston for an acid burette. Background Art

[0002] The acid burette is mainly used for analytical operations such as acid-base neutralization titration tests. The lower end of the acid burette is equipped with a glass piston to control the outflow of liquid. Since it can withstand acidic or strongly oxidizing solutions, it is widely used in situations where accurate measurement and control of the volume of these solutions is required.

[0003] When using an acid burette, people will first apply vaseline lubricant on the surface of the stopcock to improve the lubrication effect of the stopcock in the stopcock housing, screw the stopcock into the stopcock housing, and then put a rubber band on the surface of the end of the stopcock extending outside the stopcock housing to prevent the stopcock from loosening due to long-term use. However, using a rubber band to limit the position is not conducive to maintaining the seal between the stopcock and the stopcock housing. The acid burette is mainly used in acid-base neutralization titration experiments, and the solution is acidic or strongly oxidizing. Therefore, during long-term use, the rubber band is easily exposed to some liquids, resulting in corrosion or breakage, thereby affecting the limiting effect of the stopcock. Utility Model Content

[0004] The purpose of the utility model is to make up for the deficiencies of the prior art and to provide a piston for an acid burette.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A piston for an acid burette comprises an acid burette body, the acid burette body being provided with a stopcock housing and a piston body, one end of the piston body passing through the stopcock housing, and a limit assembly being provided at the end of the piston body to prevent the piston body from loosening and falling;

[0007] The limiting assembly includes an abutment sleeve, which is arranged at the end of the piston body. A sealing assembly is arranged between the abutment sleeve and the plug shell, and the two sides of the sealing assembly are respectively abutted against the side of the abutment sleeve and the plug shell that are close to each other, so that the end of the piston body and the plug shell are sealed through the sealing assembly.

[0008] Furthermore, a positioning groove is provided on the inner wall of the abutting sleeve, and a plurality of limiting rings are provided in the positioning groove. The plurality of limiting rings are all sleeved on one end of the piston body to increase the friction between the abutting sleeve and the piston body.

[0009] Furthermore, a plurality of limiting rings are arranged in sequence at equal distances in the positioning groove, the limiting rings are arranged at an angle, and the limiting rings are made of rubber.

[0010] Furthermore, a positioning shell is fixedly sleeved on the outside of the abutment sleeve, and a locking assembly is provided on the outside of the positioning shell. The other side of the locking assembly is installed on the outside of the plug shell, so that the abutment sleeve and the sealing assembly are installed on one side of the plug shell through the locking assembly.

[0011] Furthermore, the lock assembly includes a locking block mounted on the outside of the plug housing, an elastic member is provided on one side of the locking block, and a clamp is provided on the side of the elastic member away from the locking block;

[0012] The outer side of the positioning shell is fixedly connected with a clamping block corresponding to the clamping hoop. When locking, the clamping hoop is clamped on one side of the clamping block to play a locking role.

[0013] Furthermore, the sealing assembly includes a connecting sleeve sleeved on the outside of the piston body, and a protrusion is provided on a side of the connecting sleeve close to the plug housing;

[0014] A limiting groove is provided on one side of the plug shell close to the connecting sleeve, and the inner wall of the limiting groove contacts the surface of the protruding part.

[0015] Furthermore, a sliding groove is provided on one side of the connecting sleeve close to the positioning shell, and a plurality of balls are provided on one side of the positioning shell close to the sliding groove, and the surfaces of the plurality of balls are all slidably connected to the inner wall of the sliding groove.

[0016] Compared with the prior art, the piston for the acid burette has the following beneficial effects:

[0017] First, the utility model provides an abutment sleeve at the end of the piston body so that the abutment sleeve limits the piston body through friction. At the same time, a sealing assembly is provided between the abutment sleeve and the stopcock housing to prevent corrosion caused by liquid leakage during use. This solves the problem that the rubber band of the existing acid burette is easily exposed to some liquid, resulting in corrosion or breakage, thereby affecting the limiting effect of the piston head.

[0018] 2. The utility model uses a spring to pull the abutment sleeve, generating a pulling force on the abutment sleeve toward the piston body. At the same time, the abutment sleeve maintains connection with the piston body through a limiting ring, thereby preventing the plug body from loosening and improving the sealing of the entire seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the installation effect diagram of the piston for the acid burette in this practical application;

[0020] Figure 2 This is a schematic diagram of the split structure of the plug housing and the piston body of the utility model;

[0021] Figure 3 It is a cross-sectional view of the plug housing and the piston body of the utility model;

[0022] Figure 4This is a schematic diagram of the structure of the present invention;

[0023] Figure 5 This utility model Figure 4 A partial enlarged view of point A in the middle;

[0024] Figure 6 For this utility model Figure 5 A partial enlarged view of point B in the middle;

[0025] Figure 7 This is a schematic cross-sectional view of the plug housing and the piston body of the utility model;

[0026] Figure 8 It is a structural diagram of the connecting sleeve of the utility model.

[0027] In the figure: 1. Acid burette body; 2. Stopcock shell; 3. Piston body; 31. Guide groove; 4. Limiting assembly; 401. Locking block; 402. Positioning shell; 403. Connecting sleeve; 404. Protrusion; 405. Block; 406. Abutment sleeve; 407. Clamp; 408. Spring; 409. Ball; 410. Limiting ring; 411. Slide groove; 5. Limiting groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] like Figure 1-8 As shown, the utility model provides a technical solution: a piston for an acid burette, comprising an acid burette main body 1, a plug shell 2 and a piston body 3 being provided on the acid burette main body 1, one end of the piston body 3 passing through the plug shell 2, and a limiting component 4 being provided at the end of the piston body 3 to prevent the piston body 3 from loosening and falling; the limiting component 4 comprises an abutment sleeve 406, the abutment sleeve 406 being sleeved on the end of the piston body 3, a sealing component being provided between the abutment sleeve 406 and the plug shell 2, and both sides of the sealing component respectively abut against the side of the abutment sleeve 406 and the plug shell 2 close to each other, and a sealing effect is achieved by the sealing component on the end of the piston body 3 and the plug shell 2.

[0030] When in use, the diameter of the inner side of the stopper shell 2 gradually increases from one end away from the abutment sleeve 406 to the other end, and the shape of the piston body 3 is adapted to the shape of the inside of the stopper shell 2, and a cylindrical portion extends outward from the middle of the end with a small diameter of the piston body 3, and the sealing assembly and the abutment sleeve 406 are both sleeved on the cylindrical portion, and a guide groove 31 is further provided inside the piston body 3, and the location of the guide groove 31 is adapted to the connection between the acid burette body 1 and the stopper shell 2, so as to cooperate with the internal material hole of the acid burette body 1 for use; The rotation of the piston body 3 in the Acid Burette controls the flow of liquid within the Acid Burette body 1. When the piston body 3 rotates clockwise or counterclockwise to the open position, the channel in the stopcock housing 2 aligns with the liquid channel of the Acid Burette 1, allowing liquid to flow out through the piston body 3. At this time, the pressure difference of the fluid pushes the liquid out of the burette. Similarly, when the piston body 3 rotates to the closed position, the channel in the stopcock housing 2 is no longer aligned with the liquid channel of the Acid Burette 1, and the flow channel is blocked, stopping the liquid flow.

[0031] The material of the piston body 3 is preferably polytetrafluoroethylene. The piston body 3 made of polytetrafluoroethylene has excellent corrosion resistance and can resist most chemical substances, including strong acids and strong alkalis. It is also resistant to high temperatures and suitable for various experimental conditions. In addition, the low friction coefficient of PTFE makes the operation smoother and reduces the resistance during rotation, while its non-stickiness ensures that the liquid is not easy to adhere, which is convenient for cleaning and maintenance; the abutment sleeve 406 is connected to one end of the piston body 3 by friction, and the abutment sleeve 406 is made of corrosion-resistant material, and the position in contact with the piston body 3 is a rough surface, and the abutment sleeve 406 supports the stopcock housing 2 through a sealing assembly to prevent the piston body 3 from slipping. When adjustment is needed, the piston body 3 is rotated to overcome the friction and adjust, thereby ensuring the installation sealing of the piston body 3 and ensuring that the piston body 3 can be rotated during use to facilitate the use of the acid burette.

[0032] A positioning groove is provided on the inner wall of the abutment sleeve 406, and a plurality of limiting rings 410 are arranged in the positioning groove. The limiting rings 410 are all sleeved on one end of the piston body 3 to increase the friction between the abutment sleeve 406 and the piston body 3; the limiting rings 410 are arranged in the positioning groove at equal distances, the limiting rings 410 are inclined, and the material of the limiting rings 410 is rubber; in use, the limiting rings 410 are made of wear-resistant and corrosion-resistant rubber material, and there are four limiting rings 410. After the abutment sleeve 406 is sleeved on the piston body 3, the four limiting rings 410 are respectively and simultaneously sleeved on the piston body 3, increasing the friction between the piston body 3 and the abutment sleeve 406, and further improving the limiting effect on the piston body 3.

[0033] The outer side of the abutment sleeve 406 is fixedly sleeved with a positioning shell 402, and a locking assembly is provided on the outer side of the positioning shell 402. The other side of the locking assembly is installed on the outside of the plug shell 2, so that the abutment sleeve 406 and the sealing assembly are installed on one side of the plug shell 2 through the locking assembly; the locking assembly includes a locking block 401 installed on the outer side of the plug shell 2, and an elastic member is provided on one side of the locking block 401, and a clamp 407 is provided on the side of the elastic member away from the locking block 401; the outer side of the positioning shell 402 is fixedly connected with a clamping block 405 corresponding to the clamping hoop 407. When locking, the clamping hoop 407 is clamped on one side of the clamping block 405 to play a locking role.

[0034] When in use, the elastic member adopts a spring 408, and there are two locking blocks 401 symmetrically fixed on both sides of the plug housing 2. One side of the locking block 401 is connected to one end of the fixed spring 408, and the other end of the spring 408 is connected to the clamp 407. By rotating the locking block 401 and pulling the clamp 407, the clamp 407 is clamped on the surface of the clamping block 405, and then the locking block 401 is rotated in the opposite direction, that is, the locking block 401 is pressed and locked. At this time, the spring 408 is stretched, and the elasticity of the spring 408 pulls the abutment sleeve 406 toward the sealing assembly to improve the sealing effect between the sealing assembly and the plug housing 2.

[0035] The sealing assembly includes a connecting sleeve 403 which is sleeved on the outside of the piston body 3, and a protrusion 404 is provided on the side of the connecting sleeve 403 close to the plug housing 2; a limiting groove 5 is provided on the side of the plug housing 2 close to the connecting sleeve 403, and the inner wall of the limiting groove 5 contacts the surface of the protrusion 404; when in use, the shape and size of the protrusion 404 match the shape and size of the limiting groove 5, so that the connecting sleeve 403 is used in conjunction with the limiting groove 5, and partially contacts the piston body 3. Under the action of the abutting sleeve 406, the connecting sleeve 403 can achieve effective sealing of the piston body 3 and the plug housing 2.

[0036] A slide groove 411 is provided on the side of the connecting sleeve 403 close to the positioning shell 402, and a plurality of balls 409 are provided on the side of the positioning shell 402 close to the slide groove 411, and the surfaces of the plurality of balls 409 are all slidably connected to the inner wall of the slide groove 411; when in use, an open cavity is provided on the side of the positioning shell 402 close to the connecting sleeve 403, and balls 409 are installed in the cavity, and the diameter and the position of the center of the ball 409 are adapted to the cavity opening to prevent the balls 409 from falling off, and the balls 409 can also be installed inside the slide groove 411, and the diameter is adapted. After the abutting sleeve 406 is fitted with the connecting sleeve 403, the balls 409 in the positioning shell 402 are in contact with the slide groove 411 on the connecting sleeve 403, and the staff screws the piston body 3 in response.

[0037] During installation, first screw the piston body 3 into the stopcock housing 2. After the piston body 3 is installed in the designated position, the guide groove 31 just corresponds to the acid burette body 1. At the same time, one end of the piston body 3 extends to the outside of the stopcock housing 2. Then, the connecting sleeve 403 is sleeved on the end of the piston body 3, and the connecting sleeve 403 is inserted into the limiting groove 5 through the protrusion 404 to prevent the liquid inside the stopcock housing 2 from leaking. Then, the abutment sleeve 406 is sleeved on the piston body 3 and the abutment sleeve 406 is aligned with the piston body 3. The connecting sleeve 403 fits together and contacts the piston body 3 through the internal limiting ring 410, fixing the piston body 3 through friction, thereby limiting the piston body 3. At the same time, the block 405 on the positioning shell 402 outside the abutment sleeve 406 corresponds to the clamp 407, and the positioning shell 402 and the abutment sleeve 406 are connected through the clamp 407 and the locking block 401, so that the spring 408 pulls the abutment sleeve 406 to maintain fit with the connecting sleeve 403, further improving the overall sealing effect and limiting effect.

Claims

1. A piston for an acid burette, comprising an acid burette body (1), wherein the acid burette body (1) is provided with a stopcock housing (2) and a piston body (3), one end of the piston body (3) passes through the stopcock housing (2), and a limit assembly (4) is provided at the end of the piston body (3) to prevent the piston body (3) from loosening and falling, characterized in that: The limiting assembly (4) includes an abutting sleeve (406), the abutting sleeve (406) being arranged at the end of the piston body (3), a sealing assembly being arranged between the abutting sleeve (406) and the plug housing (2), and two sides of the sealing assembly respectively abutting against the side of the abutting sleeve (406) and the plug housing (2) that are close to each other, and the sealing assembly plays a sealing role on the end of the piston body (3) and the plug housing (2).

2. The piston for an acid burette according to claim 1, characterized in that: A positioning groove is provided on the inner wall of the abutting sleeve (406), and a plurality of limiting rings (410) are provided in the positioning groove. The plurality of limiting rings (410) are all sleeved on one end of the piston body (3) to increase the friction between the abutting sleeve (406) and the piston body (3).

3. The piston for an acid burette according to claim 2, characterized in that: A plurality of the limiting rings (410) are arranged in sequence in the positioning groove at equal distances, the limiting rings (410) are arranged in an inclined manner, and the material of the limiting rings (410) is rubber.

4. The piston for an acid burette according to claim 1, characterized in that: The outer side of the abutment sleeve (406) is fixedly sleeved with a positioning shell (402), and the outer side of the positioning shell (402) is provided with a locking assembly, and the other side of the locking assembly is installed on the outside of the plug shell (2), so that the abutment sleeve (406) and the sealing assembly are installed on one side of the plug shell (2) through the locking assembly.

5. The piston for an acid burette according to claim 4, characterized in that: The locking assembly comprises a locking block (401) mounted on the outside of the cock housing (2), an elastic member is provided on one side of the locking block (401), and a clamp (407) is provided on the side of the elastic member away from the locking block (401); A clamping block (405) corresponding to the clamping hoop (407) is fixedly connected to the outer side of the positioning shell (402). When locking, the clamping hoop (407) is clamped on one side of the clamping block (405) to play a locking role.

6. The piston for an acid burette according to claim 4, characterized in that: The sealing assembly comprises a connecting sleeve (403) sleeved on the outside of the piston body (3), and a protrusion (404) is provided on a side of the connecting sleeve (403) close to the plug housing (2); A limiting groove (5) is provided on one side of the plug housing (2) close to the connecting sleeve (403), and the inner wall of the limiting groove (5) contacts the surface of the protrusion (404).

7. The piston for an acid burette according to claim 6, characterized in that: A sliding groove (411) is provided on one side of the connecting sleeve (403) close to the positioning shell (402), and a plurality of balls (409) are provided on one side of the positioning shell (402) close to the sliding groove (411), and the surfaces of the plurality of balls (409) are all slidably connected to the inner wall of the sliding groove (411).

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