Chemical negative pressure sampler

Abstract

The utility model relates to a kind of chemical negative pressure sampler, including liquid storage bucket and negative pressure sampling module, negative pressure sampling module includes collection bottle, suction cylinder, gas pipe and liquid taking pipe, collection bottle is equipped with bottle cap, the suction end of suction cylinder is communicated with the inside of collection bottle through bottle cap, the exhaust end of suction cylinder is communicated with one end of gas pipe, the other end of gas pipe is communicated with the inside of liquid storage bucket, one end of liquid taking pipe is communicated with the inside of liquid storage bucket, the other end of liquid taking pipe is communicated with the inside of collection bottle through bottle cap, after suction cylinder extracts the air in the inside of collection bottle, it is sent into the inside of liquid storage bucket by gas pipe, the inside of liquid storage bucket is pressurized, pressure sends the liquid in the inside of liquid storage bucket into the inside of collection bottle by liquid taking pipe, so that the overall pressure balance of system in the whole liquid taking process, reduced operation difficulty, so that liquid taking quantity can be more accurate controllable, the suction amount of suction cylinder can be controlled completely in the whole process, realize accurate simple control.

Description

Technical Field

[0001] This utility model relates to the field of experimental device technology, and in particular to a chemical negative pressure sampler. Background Technology

[0002] As is well known, sulfuric acid, an inorganic compound, is also a hazardous chemical. It is the most important oxyacid of sulfur. Pure sulfuric acid is a colorless, oily liquid. Industrially, it is usually used in aqueous solutions of different concentrations. When testing the concentration of sulfuric acid solution, it is necessary to first take a sample using a test tube. The existing sampling method is to open the sulfuric acid solution packaging container, pour the sulfuric acid solution directly into a test tube, and then place the test tube into the testing equipment. This sampling method causes sulfuric acid to be frequently exposed to the outside, which can easily cause accidental spillage and safety hazards. Therefore, we propose a hazardous chemical testing sampler that is significantly different from the existing titration-type sampling devices.

[0003] The existing technical solutions described above have the following drawbacks: Controlling the volume of liquid drawn from the storage tank using a burette is not easy and requires skilled operation; therefore, a simple and easy-to-operate liquid dispensing device is needed. Utility Model Content

[0004] The purpose of this invention is to provide a negative pressure chemical sampler to solve the problems existing in the prior art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A chemical negative pressure sampler includes a storage tank and a negative pressure sampling module. The negative pressure sampling module includes a collection bottle, a vacuum pump, a gas delivery tube, and a liquid collection tube. The collection bottle is fitted with a cap. The suction end of the vacuum pump passes through the cap and communicates with the interior of the collection bottle. The exhaust end of the vacuum pump is connected to one end of the gas delivery tube, and the other end of the gas delivery tube is connected to the interior of the storage tank. One end of the liquid collection tube is connected to the interior of the storage tank, and the other end of the liquid collection tube passes through the cap and communicates with the interior of the collection bottle.

[0007] By adopting the above technical solution, the air pump extracts air from the collection bottle and sends it into the liquid storage tank through the air delivery pipe, thereby increasing the pressure inside the liquid storage tank. The pressure then sends the liquid inside the liquid storage tank into the collection bottle through the liquid extraction pipe. This ensures overall pressure balance in the system throughout the liquid extraction process, reduces operational difficulty, and allows for more precise and controllable liquid extraction. The air extraction volume of the air pump can be completely controlled throughout the process, achieving precise and simple control.

[0008] In a further embodiment, a first connector is fixedly installed on the top of the bottle cap. A through-hole is located at the center of the top of the first connector, with the bottom end of the inlet penetrating the bottle cap. The top end of the inlet is connected to one end of a liquid dispensing tube. A suction port is located on the right side of the middle section of the first connector. The left end of the suction port extends downwards until it completely penetrates the bottle cap. A sleeve is located at the right end of the suction port. The left end of the sleeve is fixedly connected to the first connector. A piston is slidably installed inside the sleeve, and a pusher is fixedly installed on the right side of the piston. One end of the pull rod, the right end of the push-pull rod is set as an extension end located outside the sleeve, and the inside of the sleeve is connected to the air extraction hole. A sealing cover plate is fixedly installed on the sleeve. An avoidance hole is set at the center of the sealing cover plate to avoid the extension end of the push-pull rod. A first sealing ring is fixedly installed in the avoidance hole. An exhaust hole with internal and external communication is set at the top of the right end of the sleeve. One end of the exhaust hole is connected to the inside of the sleeve, and the other end of the exhaust hole is connected to one end of the air supply pipe. The sleeve, sealing cover plate, push-pull rod and piston form an air extraction cylinder.

[0009] By adopting the above technical solution, the piston divides the inside of the sleeve into two non-communicating chambers. The left chamber is used to connect with the inside of the collection bottle through the evacuation port, and the right chamber is used to connect with one end of the gas delivery tube. When starting to use it, the piston needs to be moved to the leftmost end inside the sleeve first, and then the collection bottle is installed. When the piston moves to the right, the left chamber contains the gas inside the collection bottle, and the gas in the right chamber moves to the inside of the storage tank through the gas delivery tube under the compression of the piston, thereby creating a negative pressure inside the collection bottle. The liquid inside the storage tank can then be drawn in through the liquid extraction tube.

[0010] In a further embodiment, a second connector is fixedly installed on the top of the liquid storage tank. One end of the second connector is connected to the interior of the liquid storage tank, and the other end of the second connector is connected to the liquid extraction pipe. The end of the second connector connected to the interior of the liquid storage tank extends into the interior of the liquid storage tank. An air inlet channel is provided in the middle section of the second connector. One end of the air inlet channel is connected to the air delivery pipe, and the other end of the air inlet channel is connected to the top of the interior of the liquid storage tank.

[0011] By adopting the above technical solution, the end of the second connector extending into the inside of the liquid storage tank needs to be below the liquid level inside the liquid storage tank.

[0012] In a further embodiment, the gas pipe is made of metal.

[0013] By adopting the above technical solution, the elastic deformation capacity of the gas transmission pipe is reduced, thus avoiding device failure caused by gas compression inside the gas transmission pipe.

[0014] In a further embodiment, a second sealing ring is provided at the point where the second connector fits into the liquid storage tank.

[0015] In a further embodiment, the extension end of the push-pull rod located on the outside of the sleeve is provided with a handle.

[0016] By adopting the above technical solution, the force-bearing area is increased, making it more convenient to use.

[0017] In summary, this utility model has the following beneficial effects:

[0018] 1. The air inside the collection bottle is extracted by the vacuum pump and then sent into the liquid storage tank through the air delivery pipe. This pressurizes the liquid storage tank, and the pressure forces the liquid inside the tank into the collection bottle through the liquid extraction pipe. This ensures overall pressure balance throughout the liquid extraction process, reduces operational difficulty, and allows for more precise and controllable liquid extraction. The amount of air extracted by the vacuum pump can be completely controlled throughout the process, achieving precise and simple control. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram illustrating the internal structure of the negative pressure sampling module of this utility model.

[0021] In the diagram, 1 is the storage tank; 2 is the negative pressure sampling module; 21 is the collection bottle; 22 is the vacuum pump; 23 is the gas delivery pipe; 24 is the liquid collection pipe; 3 is the bottle cap; 4 is the first connector; 5 is the sleeve; 6 is the piston; 7 is the push-pull rod; and 8 is the sealing cover. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0024] Example 1:

[0025] like Figures 1-2As shown, a chemical negative pressure sampler includes a storage tank 1 and a negative pressure sampling module 2. The negative pressure sampling module 2 includes a collection bottle 21, a suction cylinder 22, a gas delivery pipe 23, and a liquid collection pipe 24. A bottle cap 3 is installed on the collection bottle 21. The suction end of the suction cylinder 22 passes through the bottle cap 3 and communicates with the interior of the collection bottle 21. The exhaust end of the suction cylinder 22 is connected to one end of the gas delivery pipe 23, and the other end of the gas delivery pipe 23 is connected to the interior of the storage tank 1. One end of the liquid collection pipe 24 is connected to the interior of the storage tank 1, and the other end of the liquid collection pipe 24 passes through the bottle cap 3 and communicates with the collection bottle. The internal connection of 21 is as follows: A first connector 4 is fixedly installed on the top of the bottle cap 3. A liquid inlet hole is provided at the center of the top of the first connector 4, and the bottom end of the liquid inlet hole penetrates the bottle cap 3. The top end of the liquid inlet hole is connected to one end of the liquid dispensing tube 24. An air suction hole is provided on the right side of the middle section of the first connector 4. The left end of the air suction hole extends downward until it completely penetrates the bottle cap 3. A sleeve 5 is provided on the right end of the air suction hole. The left end of the sleeve 5 is fixedly connected to the first connector 4. A piston 6 is slidably installed inside the sleeve 5. One end of a push-pull rod 7 is fixedly installed on the right side of the piston 6. The right end of the push-pull rod 7 is set as an extension end located outside the sleeve 5, and the inside of the sleeve 5 is connected to the air extraction hole. A sealing cover plate 8 is fixedly installed on the sleeve 5. An obstacle hole is set at the center of the sealing cover plate 8 to avoid the extension end of the push-pull rod 7. A first sealing ring is fixedly installed in the obstacle hole. An exhaust hole with internal and external communication is set at the top of the right end of the sleeve 5. One end of the exhaust hole is connected to the inside of the sleeve 5, and the other end of the exhaust hole is connected to one end of the air supply pipe 23. The sleeve 5, the sealing cover plate 8, the push-pull rod 7, and the piston 6 form the air extraction cylinder 22; the liquid storage tank 1 A second connector is fixedly installed at the top. One end of the second connector is connected to the inside of the liquid storage tank 1, and the other end of the second connector is connected to the liquid dispensing pipe 24. The end of the second connector connected to the inside of the liquid storage tank 1 extends into the inside of the liquid storage tank 1. An air inlet channel is provided in the middle section of the second connector. One end of the air inlet channel is connected to the air delivery pipe 23, and the other end of the air inlet channel is connected to the top of the inside of the liquid storage tank 1. The air delivery pipe 23 is made of metal. A second sealing ring is provided at the joint between the second connector and the liquid storage tank 1. A handle is provided at the extension end of the push-pull rod 7 located outside the sleeve 5.

[0026] Specific implementation process: Air is extracted from the collection bottle using an air pump and then sent into the storage tank through an air delivery pipe, causing the storage tank to pressurize. This pressure forces the liquid inside the storage tank into the collection bottle through a liquid extraction pipe, ensuring overall pressure balance throughout the liquid extraction process. This reduces operational difficulty and allows for more precise and controllable liquid extraction. The air extraction volume of the air pump can be completely controlled throughout the process, achieving precise and simple control.

[0027] The piston divides the inside of the sleeve into two unconnected chambers. The left chamber is used to connect to the inside of the collection bottle through the evacuation port, and the right chamber is used to connect to one end of the gas delivery tube. When starting to use it, the piston needs to be moved to the leftmost end inside the sleeve first, and then the collection bottle is installed. When the piston moves to the right, the left chamber contains the gas inside the collection bottle, and the gas in the right chamber moves to the inside of the storage tank through the gas delivery tube under the compression of the piston, thereby creating a negative pressure inside the collection bottle. The liquid inside the storage tank can then be drawn in through the liquid extraction tube.

[0028] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0029] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A chemical negative pressure sampler, characterized in that: The system includes a storage tank (1) and a negative pressure sampling module (2). The negative pressure sampling module (2) includes a collection bottle (21), a vacuum pump (22), a gas delivery pipe (23), and a liquid collection pipe (24). The collection bottle (21) is fitted with a cap (3). The suction end of the vacuum pump (22) passes through the cap (3) and communicates with the inside of the collection bottle (21). The exhaust end of the vacuum pump (22) is connected to one end of the gas delivery pipe (23), and the other end of the gas delivery pipe (23) is connected to the inside of the storage tank (1). One end of the liquid collection pipe (24) is connected to the inside of the storage tank (1), and the other end of the liquid collection pipe (24) passes through the cap (3) and communicates with the inside of the collection bottle (21).

2. The chemical negative pressure sampler according to claim 1, characterized in that: A first connector (4) is fixedly installed on the top of the bottle cap (3). A through-hole is located at the center of the top of the first connector (4), with the bottom end of the inlet penetrating the bottle cap (3). The top end of the inlet is connected to one end of the liquid extraction tube (24). A suction hole is located on the right side of the middle section of the first connector (4). The left end of the suction hole extends downwards until it completely penetrates the bottle cap (3). A sleeve (5) is located on the right end of the suction hole. The left end of the sleeve (5) is fixedly connected to the first connector (4). A piston (6) is slidably installed inside the sleeve (5). One end of a push-pull rod (7) is fixedly installed on the right side of the piston (6). The right end of the push-pull rod (7) is set as an extension end located outside the sleeve (5), and the inside of the sleeve (5) is connected to the air extraction hole. A sealing cover plate (8) is fixedly installed on the sleeve (5). A clearance hole is provided at the center of the sealing cover plate (8) to avoid the extension end of the push-pull rod (7). A first sealing ring is fixedly installed in the clearance hole. An exhaust hole with internal and external communication is provided at the top of the right end of the sleeve (5). One end of the exhaust hole is connected to the inside of the sleeve (5), and the other end of the exhaust hole is connected to one end of the air supply pipe (23). The sleeve (5), sealing cover plate (8), push-pull rod (7), and piston (6) form an air extraction cylinder (22).

3. A chemical negative pressure sampler according to claim 2, characterized in that: A second connector is fixedly installed on the top of the liquid storage tank (1). One end of the second connector is connected to the inside of the liquid storage tank (1), and the other end of the second connector is connected to the liquid extraction pipe (24). The end of the second connector connected to the inside of the liquid storage tank (1) extends into the inside of the liquid storage tank (1). An air inlet channel is provided in the middle section of the second connector. One end of the air inlet channel is connected to the air delivery pipe (23), and the other end of the air inlet channel is connected to the top of the inside of the liquid storage tank (1).

4. A chemical negative pressure sampler according to claim 1, characterized in that: The gas pipe (23) is made of metal.

5. A chemical negative pressure sampler according to claim 3, characterized in that: A second sealing ring is provided at the point where the second connector fits into the liquid storage tank (1).

6. A chemical negative pressure sampler according to claim 3, characterized in that: The push-pull rod (7) has a handle at its extended end located outside the sleeve (5).

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