Acid and alkali resistant chemical sampler

Abstract

The utility model discloses an acid and alkali resistant chemical sampler which comprises a sampler main body and an air extractor, a first connecting part and a second connecting part are arranged on the sampler main body, and a liquid inlet channel communicated with the first connecting part and the second connecting part is arranged in the sampler main body. The air extracting device comprises a shell internally provided with an air cavity and a pull rod with one end inserted into the air cavity to movably extract air, an air extracting channel is arranged in the sampler main body and communicated with the second connecting part and the air cavity, an elastic valve plate is arranged at the air outlet end of the air extracting channel, and the valve plate closes communication between the air outlet end of the air extracting channel and the air cavity. When the pull rod is pulled by external force to exhaust air, one side of the valve plate is pushed by air pressure at the air outlet end of the air exhaust channel to generate elastic deformation so as to generate a gap for air in the air exhaust channel to flow into the air cavity, the valve plate is made of an acid and alkali resistant material, and the sampler main body, the shell and the pull rod are all made of an acid and alkali resistant plastic material. The acid and alkali resistance of the sampler is improved.

Description

Technical Field

[0001] The utility model relates to a sampler, in particular to an acid and alkali resistant chemical sampler. Background Art

[0002] In the fields of chemistry and medicine, the detection of liquid chemicals is a common task. The existing sampling method is to pour bottled liquid chemicals into a sampling container. However, when pouring the liquid, it is easy for the liquid reagent to spill. Generally, liquid chemicals are acidic compounds or alkaline compounds, and such compounds are generally corrosive. The spilled liquid is likely to cause harm to people.

[0003] Currently, there are samplers for sampling to avoid the spillage of liquid reagents during pouring. For example, a chemical liquid sampling device disclosed in Chinese Utility Model Patent CN211877498U includes a sampling bottle. A bottle cap is provided at the top of the sampling bottle. A first connector and a second connector are provided at the top of the bottle cap. Connecting caps are provided on the surfaces of the first connector and the second connector. A sampling tube communicates with the top of the connecting cap on the surface of the first connector. A suction tube communicates with the top of the connecting cap on the surface of the second connector. One end of the suction tube communicates with a suction cylinder. The suction cylinder includes a housing, a pull rod, a piston, an exhaust pipe, an exhaust check valve and a suction check valve. The piston is lapped on the inner wall of the housing. A pull rod is fixedly connected to the right side of the piston. The left end of the housing communicates with the suction check valve, and the suction check valve communicates with one end of the suction tube. The left top of the housing communicates with the exhaust pipe, and an exhaust check valve is provided at one end of the exhaust pipe. By pulling the pull rod, the space in the sampling bottle is drawn into the housing, creating a negative pressure in the sampling bottle. The negative pressure in the sampling bottle causes the sampling tube to suck the liquid reagent into the sampling bottle to complete the sampling.

[0004] The bottle caps, the outer shells of the suction cylinders and the pull rods of the existing samplers generally adopt metal materials. The structures of metal materials are easily corroded by the acidic or alkaline liquid chemicals being sampled, which does not meet the acid and alkali resistance and safety requirements, and has a low service life. Moreover, when the sampled liquid enters the sampling bottle through the bottle cap, the corrosive substances will mix into the sampled liquid reagent, thus affecting the detection accuracy of the liquid reagent. Summary of the Utility Model

[0005] Based on the problem that the bottle caps, the outer shells of the suction cylinders and the pull rods of the existing samplers generally adopt metal materials and the structures of metal materials are easily corroded by the acidic or alkaline liquid chemicals being sampled, not meeting the acid and alkali resistance and safety requirements, the utility model provides an acid and alkali resistant chemical sampler.

[0006] The technical solution adopted by the present utility model to solve the above technical problems is as follows: an acid and alkali resistant chemical sampler, comprising a sampler main body and an air extraction device. The sampler main body is provided with a first connection part and a second connection part. An inlet liquid channel is arranged in the sampler main body. The inlet end of the inlet liquid channel communicates with the first connection part, and the outlet end of the inlet liquid channel communicates with the second connection part. The air extraction device includes a housing fixed to the sampler main body and having an air cavity inside, and a pull rod with one end inserted into the air cavity for moving air extraction. An air extraction channel is arranged in the sampler main body. The inlet end of the air extraction channel communicates with the second connection part, and the outlet end of the air extraction channel communicates with the air cavity. A one-way valve for restricting the air flow to only flow from the air extraction channel to the air cavity is arranged between the air extraction channel and the air cavity. The one-way valve is an elastic valve sheet, and the valve sheet is arranged at the outlet end of the air extraction channel to close the communication between the outlet end of the air extraction channel and the air cavity. When the pull rod is pulled by an external force for air extraction, one side of the valve sheet is elastically deformed by the air pressure at the outlet end of the air extraction channel to generate a gap for the air in the air extraction channel to flow into the air cavity. The valve sheet is made of acid and alkali resistant material, and the sampler main body, the housing and the pull rod are all made of acid and alkali resistant plastic material.

[0007] A further preferred technical solution of the present utility model is that: the sampler main body, the housing and the pull rod are all made of hdpe / ptfe material.

[0008] A further preferred technical solution of the present utility model is that: the valve sheet is a diaphragm made of perfluorinated material.

[0009] A further preferred technical solution of the present utility model is that: the pull rod includes a rod body and a piston part connected to one end of the rod body. The end of the pull rod with the piston part is inserted into the air cavity, and the tail end of the housing has a perforation for the rod body to pass through.

[0010] A further preferred technical solution of the present utility model is that: the diameter of the rod body is 12mm.

[0011] A further preferred technical solution of the present utility model is that: the first connection part is a first joint fixedly arranged on the sampler main body. The side wall of the first joint is provided with an external thread for connection, and the inlet end of the inlet liquid channel communicates with the end face of the first joint.

[0012] A further preferred technical solution of the present utility model is that: the second connection part is a second joint fixedly arranged on the sampler main body. The second joint has a first connection groove for connection. An internal thread is arranged in the first connection groove. The outlet end of the inlet liquid channel communicates with the first connection groove, and the inlet end of the air extraction channel communicates with the first connection groove.

[0013] A further preferred technical solution of the present utility model is that the housing is detachably connected to the sampler body. The housing is a cylindrical barrel structure with an opening at one end. An external thread is provided on the outer wall of the opening end of the housing. A third joint is provided on the sampler body. The third joint has a second connection groove for connection. The opening end of the housing is inserted into the second connection groove and is threadedly connected. A step for abutting against the opening end of the housing is provided on the inner groove wall of the second connection groove. The air outlet end of the air extraction channel communicates with the second connection groove.

[0014] A further preferred technical solution of the present utility model is that the bottom of the second connection groove has a curvature that converges towards the middle. The valve plate is circular. The center of the valve plate is fixed at the center of the bottom of the second connection groove by a screw, and the four peripheral edges of the valve plate abut against the bottom surface of the second connection groove. The air outlet end of the air extraction channel is provided on the bottom of the second connection groove and is located below the valve plate.

[0015] A further preferred technical solution of the present utility model is that anti-slip patterns are provided on the outer wall of the housing.

[0016] Compared with the prior art, the advantages of the present utility model are that the sampler body, the housing, and the pull rod are all made of acid and alkali-resistant plastic materials, which improves the acid and alkali resistance of the sampler, makes it meet the requirements of acid and alkali resistance and safety, extends the service life, and when the liquid chemical enters the sampling bottle connected to the second connecting part from the liquid inlet channel, the liquid chemical will not corrode the sampler body, thereby preventing the corroded substances from mixing into the sampled liquid reagent and reducing the impact on the accuracy of the sampled liquid chemical. The valve plate is made of acid and alkali-resistant material. Since the gas drawn in by the air extraction device may contain the sampled chemical released, the valve plate made of acid and alkali-resistant material can prevent the valve plate from being corroded by the gas and affecting the airtightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further described in detail below in conjunction with the drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present utility model. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a sectional view of the present utility model;

[0020] Figure 3 is an exploded view of the air extraction device, the valve plate, and the sampler body;

[0021] Figure 4 Schematic structure of the sampler body Figure 1 ;

[0022] Figure 5 Schematic structure of the sampler body Figure 2 ;

[0023] Figure 6 is Figure 2 partial enlarged view of area A of

[0024] Figure 7 Use state diagram of the present utility model

[0025] In the figure: 1. Sampler body; 2. Shell; 3. First connection part; 4. Second connection part; 5. Anti-slip lines; 6. Pull rod; 7. First joint; 8. External thread; 9. Liquid inlet channel; 10. Second joint; 11. Internal thread; 12. First connection groove; 13. Air cavity; 14. Piston part; 15. Rod body; 16. Perforation; 17. Handle; 18. Valve plate; 19. Second connection groove; 20. Third joint; 21. Step; 22. Air extraction channel; 23. Sampling bottle; 24. Gap Specific embodiments

[0026] The preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary, and should not be construed as limiting the protection scope of the present utility model

[0027] It should be noted that: Similar reference numerals denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it may not be further defined and explained in subsequent drawings

[0028] Figures 1-7 As shown, the acid and alkali resistant chemical sampler includes a sampler body 1 and an air extraction device

[0029] Figure 4 、 Figure 5 、 Figure 7 As shown, the sampler body 1 is provided with a first connection part 3 and a second connection part 4. The sampler body 1 is internally provided with a liquid inlet channel 9. The liquid inlet end of the liquid inlet channel 9 communicates with the first connection part 3, and the liquid outlet end of the liquid inlet channel 9 communicates with the second connection part 4. The first connection part 3 is used to connect the sampling tube, and the second connection part 4 is used to connect the sampling bottle 23. The sampling tube is inserted into the liquid reagent to be sampled, and the air extraction device is used to extract air to form a negative pressure in the sampling bottle 23. The negative pressure in the sampling bottle 23 causes the liquid reagent to be sucked into the liquid inlet channel 9 through the sampling tube, and then enters the sampling bottle 23 from the liquid inlet channel 9 for collection

[0030] Preferably, the first connecting portion 3 is a first joint 7 fixed to the sampler body 1. An external thread 8 for connection is provided on the side wall of the first joint 7. The liquid inlet end of the liquid inlet passage 9 communicates with the end face of the first joint 7. The first connecting portion 3 and the sampler body 1 are integrally formed.

[0031] Preferably, the second connecting portion 4 is a second joint 10 fixed to the sampler body 1. The second joint 10 has a first connecting groove 12 for connection. An internal thread 11 is provided in the first connecting groove 12. The liquid outlet end of the liquid inlet passage 9 communicates with the first connecting groove 12. The mouth of the sampling bottle 23 can be inserted into the first connecting groove 12 and threadedly connected to the first connecting groove 12, so that the liquid outlet end of the liquid inlet passage 9 communicates with the sampling bottle 23. The second joint 10 and the sampler body 1 are integrally formed.

[0032] The liquid outlet end of the liquid inlet passage 9 is arranged at the bottom of the first connecting groove 12.

[0033] Figure 2 As shown, preferably, the first connecting portion 3 and the second connecting portion 4 are respectively arranged on the upper and lower sides of the sampler body 1. The liquid inlet passage 9 extends from top to bottom and communicates with the upper and lower sides of the sampler body 1.

[0034] Figures 1-3 As shown, the air extraction device includes a housing 2 fixed to the sampler body 1 and having an air cavity 13 therein, and a pull rod 6 with one end inserted into the air cavity 13 for moving air extraction. An air extraction passage 22 is provided in the sampler body 1. The air inlet end of the air extraction passage 22 communicates with the second connecting portion 4. The air outlet end of the air extraction passage 22 communicates with the air cavity 13. A first one-way valve for restricting the air flow to only flow from the air extraction passage 22 into the air cavity 13 is provided between the air extraction passage 22 and the air cavity 13. The first one-way valve is an elastic valve piece 18. The valve piece 18 is arranged at the air outlet end of the air extraction passage 22 to close the communication between the air outlet end of the air extraction passage 22 and the air cavity 13. When the pull rod 6 is pulled by an external force for air extraction, a negative pressure is generated in the air cavity 13, causing a pressure difference on both sides of the valve piece 18. The air pressure at the air outlet end of the air extraction passage 22 is greater than the air pressure in the air cavity 13. One side of the valve piece 18 is pushed by the air pressure at the air outlet end of the air extraction passage 22 to undergo elastic deformation to generate a gap 24 for the air in the air extraction passage 22 to flow into the air cavity 13, so that the air outlet end of the air extraction passage 22 communicates with the air cavity 13. At this time, the air in the collection bottle is sucked into the air cavity 13 from the air extraction passage 22, causing a negative pressure in the collection bottle, so that the liquid reagent is sucked into the sampling bottle 23 from the liquid inlet passage 9. When the pulling of the pull rod 6 stops and the air pressures on both sides of the valve piece 18 are the same, the valve piece 18 elastically resets to close the communication between the air outlet end of the air extraction passage 22 and the air cavity 13.

[0035] The air inlet end of the air extraction passage 22 communicates with the first connecting groove 12. The air inlet end of the air extraction passage 22 is arranged at the bottom of the first connecting groove 12.

[0036] The pull rod 6 includes a rod body 15 and a piston portion 14 connected to one end of the rod body 15. The pull rod 6 has one end of the piston portion 14 inserted into the air cavity 13. The tail end of the shell 2 has a through hole 16 for the rod body 15 to pass through. The diameter of the piston portion 14 is equal to the inner diameter of the air cavity 13. The piston portion 14 is sealed and fits with the inner wall of the air cavity 13. By pulling the pull rod 6 backward, the piston portion 14 moves backward in the air cavity 13, increasing the volume of the air cavity 13 in front of the piston portion 14 to generate negative pressure for inhalation.

[0037] The rod body 15 and the piston portion 14 are integrally formed.

[0038] In order to improve the sealing between the piston portion 14 and the inner wall of the air cavity 13, a sealing ring can be sleeved on the piston portion 14, and the sealing ring is clamped between the piston portion 14 and the inner wall of the air cavity 13 to improve the sealing.

[0039] The rear end of the rod body 15 is fixedly connected to the handle 17 . Preferably, the rear end of the rod body 15 is threadedly connected to the handle 17 .

[0040] The diameter of the rod body 15 is 12 mm, so that the rod body 15 has a relatively thick diameter.

[0041] Figure 6 As shown, the sampler body 1 is detachably connected, the shell 2 is a cylindrical structure with an opening at one end, an external thread 8 is provided on the outer wall of the open end of the shell 2, and a third joint 20 is provided on the sampler body 1. The third joint 20 has a second connecting groove 19 for connection, and the open end of the shell 2 is inserted into the second connecting groove 19 for internal thread connection. The second connecting groove 19 has an internal thread 11 for threaded connection, and the inner groove wall of the second connecting groove 19 is provided with a step 21 for the open end of the shell 2 to abut, and the outlet end of the exhaust channel 22 is connected to the second connecting groove 19.

[0042] Preferably, the bottom of the second connecting groove 19 has an arc that converges toward the middle, the valve plate 18 is circular, the center of the valve plate 18 is fixed to the center of the bottom of the second connecting groove 19 by screws, and the four peripheral edges of the valve plate 18 are against the bottom surface of the second connecting groove 19, the outlet end of the exhaust channel 22 is arranged on the bottom of the second connecting groove 19, and is located below the valve plate 18, the valve plate 18 closes the connection between the outlet end of the exhaust channel 22 and the air cavity 13, and the valve plate 18 cooperates with the bottom surface of the second connecting groove 19 to achieve better air tightness.

[0043] When the pull rod 6 is moved backward by external force to exhaust air, the valve plate 18 is elastically deformed to form the above-mentioned gap 24 between the valve plate 18 and the bottom of the second connecting groove 19.

[0044] When it is necessary to discharge the air drawn into the air chamber 13, the housing 2 can be removed from the sampler main body 1, and then the pull rod 6 is pushed inward to move the piston portion 14 forward to the initial position, and then the housing 2 is reinstalled on the sampler main body 1 to prepare for the next air extraction.

[0045] Regarding the structure for discharging the air drawn into the air chamber 13, the present patent also has another method. For example, a second one-way valve that restricts air to flow only from the air chamber 13 to the external atmospheric environment is provided on the housing 2. The pull rod 6 is pushed inward to move the piston portion 14 forward, and the gas drawn in is discharged to the atmospheric environment from the second one-way valve during the forward movement of the piston portion 14.

[0046] The valve plate 18 is made of an acid- and alkali-resistant material. Preferably, the valve plate 18 is a diaphragm made of a perfluorinated material. Since the gas drawn in by the air extraction device may contain the sampled chemicals emitted, making the valve plate 18 of an acid- and alkali-resistant material can prevent the valve plate 18 from being corroded by the gas and affecting the airtightness.

[0047] The sampler main body 1, the housing 2, and the pull rod 6 are all made of acid- and alkali-resistant plastic materials. Preferably, the sampler main body 1, the housing 2, and the pull rod 6 are all made of hdpe / ptfe materials. Replacing the original metal sampler main body 1, housing 2, and pull rod 6 with acid- and alkali-resistant plastic materials for the sampler main body 1, housing 2, and pull rod 6 improves the acid- and alkali resistance of the sampler, making it meet the requirements of acid- and alkali resistance and safety, extending the service life, and when the liquid chemical enters the sampling bottle 23 connected to the second connection portion 4 from the liquid inlet passage 9, the liquid chemical will not corrode the sampler main body 1, thereby preventing the corroded substances from mixing into the sampled liquid reagent and reducing the influence on the accuracy of the sampled liquid chemical.

[0048] Anti-slip patterns 5 are provided on the outer wall of the housing 2 for anti-slip.

[0049] The above has introduced the acid- and alkali-resistant chemical sampler provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the present utility model and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. Acid and alkali resistant chemical sampler, comprising a sampler body and an air extraction device, characterized in that, The sampler body is provided with a first connection part and a second connection part. An inlet channel is arranged in the sampler body. The inlet end of the inlet channel communicates with the first connection part, and the outlet end of the inlet channel communicates with the second connection part. The air extraction device includes a housing fixed to the sampler body and having an air cavity inside, and a pull rod with one end inserted into the air cavity for moving air extraction. An air extraction channel is arranged in the sampler body. The inlet end of the air extraction channel communicates with the second connection part, and the outlet end of the air extraction channel communicates with the air cavity. A one-way valve for restricting the air flow to only flow from the air extraction channel into the air cavity is arranged between the air extraction channel and the air cavity. The one-way valve is an elastic valve plate. The valve plate is arranged at the outlet end of the air extraction channel to close the connection between the outlet end of the air extraction channel and the air cavity. When the pull rod is pulled by an external force for air extraction, one side of the valve plate is elastically deformed by the air pressure at the outlet end of the air extraction channel to generate a gap for the air in the air extraction channel to flow into the air cavity. The valve plate is made of acid and alkali resistant material. The sampler body, the housing and the pull rod are all made of acid and alkali resistant plastic material.

2. The acid and alkali resistant chemical sampler according to claim 1, wherein, The sampler body, the housing and the pull rod are all made of hdpe / ptfe material.

3. The acid and alkali resistant chemical sampler according to claim 1, characterized in that, The valve plate is a diaphragm made of perfluorinated material.

4. The acid and alkali resistant chemical sampler according to claim 1, characterized in that The pull rod includes a rod body and a piston part connected to one end of the rod body. The end of the pull rod with the piston part is inserted into the air cavity. The tail end of the housing has a perforation for the rod body to pass through.

5. The acid and alkali resistant chemical sampler according to claim 4, characterized in that, The diameter of the rod body is 12 mm.

6. The acid and alkali resistant chemical sampler according to claim 1, wherein The first connection part is a first connector fixed on the sampler body. External threads for connection are arranged on the side wall of the first connector. The inlet end of the inlet channel communicates with the end face of the first connector.

7. The acid and alkali resistant chemical sampler according to claim 1, characterized in that, The second connection part is a second connector fixed on the sampler body. The second connector has a first connection groove for connection. Internal threads are arranged in the first connection groove. The outlet end of the inlet channel communicates with the first connection groove, and the inlet end of the air extraction channel communicates with the first connection groove.

8. The acid and alkali resistant chemical sampler according to claim 1, characterized in that, The housing is detachably connected to the sampler body. The housing is a cylindrical barrel structure with an opening at one end. External threads are arranged on the outer wall of the opening end of the housing. A third connector is arranged on the sampler body. The third connector has a second connection groove for connection. The opening end of the housing is inserted into the second connection groove for threaded connection. A step for the opening end of the housing to abut against is arranged on the inner groove wall of the second connection groove. The outlet end of the air extraction channel communicates with the second connection groove.

9. The acid and alkali resistant chemical sampler according to claim 8, wherein, The bottom of the second connection groove has a curvature that converges towards the middle. The valve plate is circular. The center of the valve plate is fixed at the center of the bottom of the second connection groove by a screw, and the four peripheral edges of the valve plate abut against the bottom surface of the second connection groove. The outlet end of the air extraction channel is arranged on the bottom of the second connection groove and is located below the valve plate.

10. The acid and alkali resistant chemical sampler according to claim 1, characterized in that, Anti-slip patterns are arranged on the outer wall of the housing.

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