Small-capacity chemical accurate capacity determining device

Abstract

The utility model relates to the technical field of constant volume metering, and discloses a small-volume chemical accurate constant volume device. According to the device, the top of a cavity is open, a first through opening and a second through opening are formed in the bottom of the cavity, a first external thread connector is installed at the first through opening, the interior of the first external thread connector is connected with a first pipeline, and the exterior of the first external thread connector is connected with a first sealing head in a locked mode; a second external thread connector is installed at the second through opening, a second pipeline is installed in the second external thread connector, the second pipeline extends into the cavity and is arranged in the cavity, the exterior of the second external thread connector is connected with a second sealing head in a locking mode, and the tail end of the second pipeline is connected with a second pneumatic valve; the end cover is mounted at the opening of the cavity. The device solves the problem that the mixing is not accurate and quick enough when the chemical is configured in a small dosage, achieves the effects of reducing the precision requirement of an electronic scale, saving the cost and accurately controlling, is small in size, is convenient to install and use, and has popularization value.

Description

Technical Field

[0001] The utility model relates to the technical field of constant volume metering, in particular to a precise constant volume device for small-capacity chemicals. Background Technique

[0002] At present, with the booming development of the semiconductor, display panel, and new energy industries, the demand for chemicals and abrasive fluids in their production processes has been steadily increasing. Due to the transportation and use restrictions of chemicals and abrasive fluids, some chemicals need to be diluted or mixed with other types of chemicals. In this case, due to different processes, the concentrations of dilution and mixing vary, and the required amount of stock solution is sometimes very small. If weighed by the electronic scale of the mixing tank, not only high precision is required for the electronic scale, but also high requirements are imposed on the structure of the entire mixing tank. Otherwise, the concentration of the mixed chemicals cannot meet the requirements.

[0003] Therefore, how to design a constant volume device for small-capacity chemicals to accurately, quickly, and cost-effectively mix the mixed solution with a very small demand for the stock solution of chemicals is a defect that needs to be solved by those skilled in the art. Summary of the Utility Model

[0004] In view of the above problems, the utility model proposes a precise constant volume device for small-capacity chemicals to solve the technical problems of inaccurate and slow mixing during the small-dose configuration of chemicals. To achieve the above object, a precise constant volume device for small-capacity chemicals of the utility model includes:

[0005] A cavity with an opening at the top, a first through port and a second through port are provided at the bottom of the cavity. A first external thread joint is installed at the first through port, a first pipeline is connected inside the first external thread joint, and the outside of the first external thread joint is tightly connected to a first head.

[0006] A second external thread joint is installed at the second through port, a second pipeline is installed inside the second external thread joint, the second pipeline extends into the cavity and is placed in the cavity, the outside of the second external thread joint is tightly connected to a second head, and the end of the second pipeline is connected to a second pneumatic valve.

[0007] An end cover is installed at the opening of the cavity. A third through port is provided at the top of the end cover. A third external thread joint is installed at the third through port, a third pipeline is arranged inside the third external thread joint, the third external thread joint is tightly connected to a third head, and the end of the third pipeline is connected to a third pneumatic valve.

[0008] A three-way pipe, the first port of the three-way pipe is connected to a first pneumatic valve through a pipeline, the second port of the three-way pipe is connected to a fourth pneumatic valve through a pipeline, and the third port of the three-way pipe is connected to the first pipeline.

[0009] A liquid level sensor is installed on the outer wall of the second pipeline.

[0010] Preferably, the liquid level sensor is installed at the front end of the cartridge. A clamping interface is provided at the rear end of the cartridge. The cartridge is installed on the outer wall of the second pipe through the clamping interface. The rear end of the cartridge is connected to a clamping ring through an external thread, and the rear end of the cartridge is connected to the fourth end cap through an internal thread.

[0011] Preferably, a second ferrule is installed at the end of the second external thread joint where the external thread is provided. A Teflon tape is wound around the surface of the external thread on the second external thread joint. The second end cap is connected to the second external thread joint through an external thread.

[0012] Preferably, a Teflon tape is wound around the surface of the external threads on the first external thread joint and the third external thread joint. The external thread on the first external thread joint is connected to the internal thread provided at the first through port; the external thread on the third external thread joint is connected to the internal thread at the third through port.

[0013] Preferably, the liquid level sensor is a capacitive liquid level sensor.

[0014] Preferably, the end of the first pneumatic valve is connected to an external liquid supply tank.

[0015] Preferably, the cavity is connected to the end cover through a thread.

[0016] Preferably, the end of the third pneumatic valve is connected to an external gas source.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] The small-capacity chemical precise volumetric device designed by the present utility model not only reduces the accuracy requirements of the electronic scale and saves costs, but also can achieve precise control of different capacities by adjusting the second pipe. This device has a small shape, is convenient for installation and use, and has promotional value. At the same time, the installation structure of the liquid level sensor is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a small-capacity chemical precise volumetric device.

[0020] Figure 2 It is a partial vertical sectional structural diagram of a small-capacity chemical precise volumetric device.

[0021] Figure 3 It is a schematic structural diagram of the connection between the second pipe and the second external thread joint.

[0022] Figure 4 It is an exploded view of the structure for fixing the liquid level sensor.

[0023] In the figure:

[0024] 101. Cavity; 102. First through port; 103. Second through port; 104. First external thread joint; 105. First pipeline; 106. First end cap; 107. Second external thread joint; 108. Second pipeline; 109. Second end cap; 110. Second pneumatic valve; 111. Second ferrule; 201. End cover; 202. Third through port; 203. Third external thread joint; 204. Third pipeline; 205. Third end cap; 206. Third pneumatic valve; 301. Three-way pipe; 302. First port; 303. First pneumatic valve; 304. Second port; 305. Fourth pneumatic valve; 306. Third port; 401. Liquid level sensor; 402. Cartridge; 403. Card interface; 404. Snap ring; 405. Fourth end cap. Detailed implementation mode

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", and "setting" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0027] Please refer to Figures 1 - 4 , the present invention provides a technical solution: a precise volume determination device for small-capacity chemicals, comprising: a cavity 101, an end cover 201, a three-way pipe 301, and a liquid level sensor 401.

[0028] The top of the cavity 101 is open, and a first through port 102 and a second through port 103 are provided at the bottom of the cavity 101. A first external thread joint 104 is installed at the first through port 102. A first pipe 105 is connected inside the first external thread joint 104, and the outside of the first external thread joint 104 is tightly connected to the first end head 106. A second external thread joint 107 is installed at the second through port 103. A second pipe 108 is installed inside the second external thread joint 107. The second pipe 108 extends into the cavity 101 and is placed in the cavity 101. The outside of the second external thread joint 107 is tightly connected to the second end head 109. The end of the second pipe 108 is connected to a second pneumatic valve 110. The second external thread joint 107 can not only adjust the length of the second pipe 108 in the cavity 101, but also ensure the seal between the second pipe 108 and the second external thread joint 107.

[0029] The cavity 101 is connected to the end cover 201 through a threaded connection. The end cover 201 is installed at the opening of the cavity 101. A third through port 202 is provided at the top of the end cover 201. A third external thread joint 203 is installed at the third through port 202. A third pipe 204 is provided inside the third external thread joint 203. The third external thread joint 203 is tightly connected to the third end head 205. The end of the third pipe 204 is connected to a third pneumatic valve 206; the materials of the cavity 101 and the end cover 201 are PP, acid and alkali resistant, and corrosion resistant.

[0030] The first port 302 of the three-way pipe 301 is connected to the first pneumatic valve 303 through a pipe. The second port 304 of the three-way pipe 301 is connected to the fourth pneumatic valve 305 through a pipe. The third port 306 of the three-way pipe 301 is connected to the first pipe 105; all pneumatic valves are made of PFA, acid and alkali resistant, corrosion resistant, and have a long service life.

[0031] The liquid level sensor 401 is installed on the outer wall of the second pipe 108. The liquid level sensor 401 is installed at the front end of the cartridge 402. A card interface 403 is provided at the rear end of the cartridge 402. The cartridge 402 is installed on the outer wall of the second pipe 108 through the card interface 403. The rear end of the cartridge 402 is connected to a snap ring 404 through an external thread, and the rear end of the cartridge 402 is connected to the fourth end head 405 through an internal thread. The fourth end head 405 is used to tightly fix the liquid level sensor 401. When the snap ring 404 is tightened, the cartridge 402 will be deformed by force. After long-term use, there is a risk of falling off under the vibration of the second pipe 108. By screwing the fourth end head 405 into the cartridge 402 and closely attaching to the second pipe 108, the second pipe 108 is fixed to avoid falling off due to vibration.

[0032] The cartridge 402 is provided with internal threads corresponding to the external threads at the rear end of the cartridge 402. The fourth end cap 405 is provided with external threads that match the internal threads of the cartridge 402. It can not only fit tightly with the liquid level pipe and be firmly installed, but also adjust the distance between the liquid level sensor 401 and the liquid level pipe to make the determination of the liquid level sensor 401 accurate. The snap ring 404 is provided with internal threads that match the external threads at the rear end of the cartridge 402. By tightening the threads, the cartridge 402 is firmly fixed on the second pipe 108. The snap ring 404 can be used to tighten and fix the liquid level sensor 401 to prevent the liquid level sensor 401 from shaking when the liquid flows in the second pipe 108. The depth at which the liquid level sensor 401 is installed in the cartridge 402 can control the distance between the liquid level sensor 401 and the second pipe 108, ensuring the sensitivity and accuracy of the sensor. The cartridge 402, the snap ring 404, and the fourth end cap 405 are made of PP material, which is corrosion-resistant, high-temperature-resistant, light in weight, and relatively soft in texture. It can not only be used in many occasions, but also reduces the weight of the entire device and avoids damaging the second pipe 108.

[0033] The liquid level sensor 401 is a capacitive liquid level sensor, and the second pipe 108 is a liquid level pipe. The length of the second pipe 108 in the cavity 101 is used to determine the available volume in the constant volume device. It is not only convenient to use and can be adjusted at any time, but also has accurate capacity.

[0034] The capacitive sensor can compensate for moisture, foam, and various attachments, and can even penetrate glass and plastic walls up to 10 mm thick. The capacitive sensor becomes an ideal choice for conductive medium level sensors, and at the same time ensures extremely high application reliability. It can detect the liquid levels of granular, powder, viscous or liquid media, as well as bulk solids, and provide reliable results, which is completely suitable for this device.

[0035] The end of the second external thread joint 107 with external threads is installed with a second ferrule 111. The second ferrule 111 is wound with Teflon tape on the external thread surface of the second external thread joint 107. The second end cap 109 is connected to the second external thread joint 107 through external threads. By tightening the second end cap 109, the second ferrule 111 is deformed by force to achieve a sealing effect. In addition, by loosening the second end cap 109, the inserted second pipe 108 can be moved up and down. After adjusting the position of the second pipe 108, tighten the second end cap 109 to form a seal. The external thread surfaces of the first external thread joint 104 and the third external thread joint 203 are wound with Teflon tape. The external threads on the first external thread joint 104 are connected to the internal threads provided at the first through port 102; the external threads on the third external thread joint 203 are connected to the internal threads at the third through port 202 to improve the sealing effect.

[0036] The end of the first pneumatic valve 303 is connected to an external liquid supply tank, the end of the third pneumatic valve 206 is connected to an external gas source, the second pneumatic valve 110 is connected to an external liquid storage tank, and the fourth pneumatic valve 305 is connected to a mixing device.

[0037] The small-capacity chemical precise volume setting device designed by the present utility model not only reduces the accuracy requirement of the electronic scale and saves costs, but also can achieve precise control of different volumes by adjusting the second pipeline 108. This device has a small shape, is convenient for installation and use, and has promotional value. At the same time, the installation structure of the liquid level sensor 401 is simple and the operation is convenient.

[0038] Working principle:

[0039] The usage method of this volume setting device is that through an external control system, first open the second pneumatic valve 110, and then open the first pneumatic valve 303 for liquid supply. The chemical flows into the cavity 101, and the air in the cavity is pressured and flows out from the second pipeline 108 until the chemical overflows the second pipeline 108 and is discharged from the second pneumatic valve 110. At this time, the liquid level sensor 401 detects the liquid level and gives a signal to confirm that the chemical in the volume setting device has reached the set volume. The first pneumatic valve 303 is closed, the chemical supply stops, and the second pneumatic valve 110 is closed;

[0040] Then the third pneumatic valve 206 and the fourth pneumatic valve 305 are opened, and nitrogen is filled into the cavity 101 from the third pneumatic valve 206. Under the action of pressure, the chemical in the cavity 101 is input into the mixing device through the fourth pneumatic valve 305 to complete the fixed-volume transportation of the chemical this time.

[0041] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model, and any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A small-volume chemical precise volume determination device, characterized in that: include: A cavity (101), wherein the top of the cavity (101) is open, and a first opening (102) and a second opening (103) are arranged at the bottom of the cavity (101); a first external thread joint (104) is installed at the first opening (102); the interior of the first external thread joint (104) is connected to a first pipe (105); and the exterior of the first external thread joint (104) is locked and connected to a first sealing head (106); A second external thread connector (107) is installed at the second opening (103), a second pipe (108) is installed inside the second external thread connector (107), the second pipe (108) extends into the cavity (101) and is placed in the cavity (101), the outside of the second external thread connector (107) is locked and connected to the second end cap (109), and the end of the second pipe (108) is connected to a second pneumatic valve (110); An end cover (201), the end cover (201) being installed at the opening of the cavity (101), a third opening (202) being arranged at the top of the end cover (201), a third external thread connector (203) being installed at the third opening (202), a third pipeline (204) being arranged inside the third external thread connector (203), the third external thread connector (203) being locked and connected to a third sealing head (205), and a third pneumatic valve (206) being connected to the end of the third pipeline (204); A three-way pipe (301), wherein a first port (302) of the three-way pipe (301) is connected to a first pneumatic valve (303) via a pipeline, a second port (304) of the three-way pipe (301) is connected to a fourth pneumatic valve (305) via a pipeline, and a third port (306) of the three-way pipe (301) is connected to a first pipeline (105); A liquid level sensor (401) is installed on the outer wall of the second pipe (108).

2. The small-volume chemical precise volume determination device according to claim 1, characterized in that: The liquid level sensor (401) is installed at the front end of the cartridge (402); a card interface (403) is provided at the rear end of the cartridge (402); the cartridge (402) is installed on the outer wall of the second pipe (108) through the card interface (403); the rear end of the cartridge (402) is connected to a clamping ring (404) through an external thread; and the rear end of the cartridge (402) is connected to a fourth end cap (405) through an internal thread.

3. The small-volume chemical precise volume determination device according to claim 1, characterized in that: The second external thread connector (107) is provided with a second ferrule (111) installed at the end of the external thread, and the external thread surface of the second external thread connector (107) is wrapped with raw tape, and the second end cap (109) is connected to the second external thread connector (107) via the external thread.

4. The small-volume chemical precise volume determination device according to claim 1, characterized in that: The external thread surfaces on the first external thread joint (104) and the third external thread joint (203) are wrapped with raw tape, and the external thread on the first external thread joint (104) is connected to the internal thread provided at the first opening (102); the external thread on the third external thread joint (203) is connected to the internal thread at the third opening (202).

5. The small-volume chemical precise volume determination device according to claim 1, characterized in that: The liquid level sensor (401) is a capacitive liquid level sensor.

6. The small-volume chemical precise volume determination device according to claim 1, characterized in that: The end of the first pneumatic valve (303) is connected to an external liquid supply tank.

7. The small-volume chemical precise volume determination device according to claim 1, characterized in that: The cavity (101) is connected to the end cover (201) via threads.

8. The small-volume chemical precise volume determination device according to claim 1, characterized in that: The end of the third pneumatic valve (206) is connected to an external air source.

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