Chemical delivery pump

Abstract

The utility model discloses a chemical delivery pump, which comprises a cavity and a seal cover covering the opening of the cavity, two independent cavities are arranged in the cavity, each cavity is divided into an air cavity and a liquid cavity, the tops of the air cavities and the tops of the liquid cavities are communicated, a liquid inlet pipe, a liquid discharge pipe and two air pipes are arranged on the seal cover, the lower ends of the air pipes are respectively communicated with the two air cavities, and the two air cavities are communicated with the liquid discharge pipe. The upper end of the liquid inlet pipe is provided with an air inlet and an air outlet, the liquid inlet pipe is provided with two branch liquid inlet pipes which are respectively inserted into the two liquid cavities, the liquid outlet pipe is provided with two branch liquid outlet pipes which are respectively inserted into the two liquid cavities, the lower ends of the two branch liquid inlet pipes are provided with one-way liquid inlet valves, and the lower ends of the two branch liquid outlet pipes are provided with one-way liquid outlet valves. The chemical delivery pump has the advantages that the chemical delivery pump does not contain easily-damaged movable parts inside, is long in service life and has the advantages of stably delivering chemicals, and the water hammer phenomenon can be avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid transportation, and particularly relates to a chemical transfer pump. Background Art

[0002] A chemical transfer pump is a transfer pump with strong corrosion resistance and strong stability, playing a core role in the chemical industry and related fields. It is widely used for transporting various chemical media, including corrosive, flammable, explosive, and toxic and harmful liquids, and can effectively prevent medium leakage and ensure the safety of the transportation environment.

[0003] Service life is an important indicator of chemical transfer pumps. Existing chemical transfer pumps are generally air bladder pumps and diaphragm pumps. The diaphragms and air bladders inside them are key moving parts inside the pump and also vulnerable parts. Due to the inevitable problems of easy wear and short service life of the diaphragms and air bladders during use, the service life of chemical transfer pumps is also limited.

[0004] In addition, the flow type of existing chemical transfer pumps during chemical transportation is generally pulsating, and the transportation is not stable, which will cause the flow velocity of chemicals in the pipeline to be uneven, thereby affecting the overall transportation efficiency.

[0005] Moreover, in the case of large-flow transportation, unstable transportation will also trigger a water hammer phenomenon, causing damage to the transportation pipeline, resulting in chemical leakage, and posing a major safety hazard. Summary of the Utility Model

[0006] The technical problem to be solved by the utility model is to provide a chemical transfer pump, the equipment of which does not contain vulnerable moving parts inside, has a long service life and stable transportation.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A chemical transfer pump includes a cavity and a cover covering the opening of the cavity. There are two mutually isolated cavities inside the cavity, and each cavity is divided into an air cavity and a liquid cavity. There is a communicating exchange port at the top of the air cavity and the liquid cavity. The cover is provided with a liquid inlet pipe, a liquid discharge pipe and two gas pipes. The lower ends of the two gas pipes are respectively led into the two air cavities. The upper end of one gas pipe branches out into a first air inlet and a first air outlet, and the upper end of the other gas pipe branches out into a second air inlet and a second air outlet. The liquid inlet pipe branches out into two branch liquid inlet pipes respectively inserted into the bottoms of the two liquid cavities, and the liquid discharge pipe branches out into two branch liquid discharge pipes respectively inserted into the bottoms of the two liquid cavities. One-way liquid inlet valves are arranged at the lower ends of the two branch liquid inlet pipes, and one-way liquid discharge valves are arranged at the lower ends of the two branch liquid discharge pipes.

[0009] With the above technical solution, there are only an inlet pipe, a drain pipe and two gas pipes in the cavity. The gas cavity and the liquid cavity are only connected through the exchange port at the top. Therefore, the air pressure in the liquid cavity can be controlled through the gas pipes to provide power for the liquid, so as to control the entry and exit of chemicals in the liquid cavity and achieve the effect of transporting chemicals. In this way, there are no vulnerable moving parts inside the device, so the service life of the device is long. Also, because there are two cavities in the cavity and they are isolated from each other, only the two branch inlet pipes and the two branch drain pipes have intersections, which does not affect the functions of the two cavities to inhale and discharge chemicals. Therefore, the two cavities can work independently. However, by controlling the two groups of cavities to work alternately, the function of low-pulse chemical output can be achieved, and the chemicals can be output smoothly.

[0010] In this chemical pump, a low-level sensor, a high-level sensor and a safety-level sensor are installed in the liquid cavity from bottom to top, and the height of the safety-level sensor is lower than that of the exchange port. The current liquid level of chemicals in the liquid cavity can be known through different level sensors, so as to more accurately control the timing of chemical inhalation or discharge and improve the working efficiency of the chemical pump. The safety-level sensor can also be used to make the height of the chemical liquid surface lower than the exchange port to prevent the chemicals from flowing into the gas cavity and protect the device.

[0011] In this chemical pump, the materials of the cavity, the cover, the inlet pipe, the drain pipe, the gas pipe, the one-way inlet valve and the one-way drain valve are all PFA or PTFE. Since both PFA and PTFE materials have excellent chemical stability, corrosion resistance and high thermal stability, they can protect these components from being eroded by chemicals, further extend the service life of the chemical pump, and also avoid chemical contamination.

[0012] In this chemical pump, the gases introduced into the first air inlet and the second air inlet are nitrogen. Since nitrogen is an inert gas with excellent chemical stability and is not easy to react with chemicals, it can protect the chemicals from being contaminated.

[0013] With the above technical solution, the chemical pump of the present utility model has the advantages of no vulnerable moving parts inside, long service life, and smooth chemical transportation, and can avoid the generation of water hammer phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following further describes the present utility model in detail with reference to the drawings and specific embodiments:

[0015] Figure 1 It is a schematic structural diagram of the chemical pump of the present utility model;

[0016] Figure 2 It is a schematic internal structure diagram of the chemical pump of the present utility model with the cavity hidden;

[0017] Figure 3 Internal cross-sectional view of the cavity of the chemical transfer pump of the present utility model;

[0018] Figure 4 Top view of the chemical transfer pump of the present utility model;

[0019] Figure 5 Pipeline diagram of the transfer system of the chemical transfer pump applying the present utility model.

[0020] Markings in the figure: 1, cover; 2, air cavity; 3, liquid cavity; 4, exchange port; 5, liquid inlet pipe; 6, liquid discharge pipe; 7-1, first air inlet; 7-2, second air inlet; 8-1, first exhaust port; 8-2, second exhaust port; 9, branch liquid inlet pipe; 10, branch liquid discharge pipe; 11, one-way liquid inlet valve; 12, one-way liquid discharge valve; 13, low liquid level sensor; 14, high liquid level sensor; 15, safety liquid level sensor; 16, liquid inlet pipeline; 17, liquid discharge pipeline; 18-1, first air inlet pipeline; 18-2, second air inlet pipeline; 19-1, first exhaust pipeline; 19-2, second exhaust pipeline; 20, liquid inlet pressure reducing valve; 21, liquid inlet switch valve; 22, liquid discharge switch valve; 23-1, first air inlet pressure reducing valve; 23-2, second air inlet pressure reducing valve; 24-1, first air inlet switch valve; 24-2, second air inlet switch valve; 25-1, first compressed gas pressure reducing valve; 25-2, second compressed gas pressure reducing valve; 26-1, first vacuum generator; 26-2, second vacuum generator; 27-1, first exhaust switch valve; 27-2, second exhaust switch valve; 28, pressure gauge; 29, flowmeter. Specific embodiments

[0021] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments

[0022] By Figures 1 to 4As shown in the figure, the chemical transfer pump of the present utility model includes a cavity and a cover 1 covering the opening of the cavity. There are two mutually isolated cavities (i.e., the first cavity and the second cavity) inside the cavity. Both cavities are divided into a gas chamber 2 and a liquid chamber 3. There is a communicating exchange port 4 at the top of the gas chamber 2 and the liquid chamber 3. The cover 1 is provided with a liquid inlet pipe 5, a liquid discharge pipe 6, and two gas pipes. The lower ends of the two gas pipes are respectively led into the two gas chambers 2. The upper end of one gas pipe is branched into a first air inlet 7-1 and a first exhaust port 8-1, and the upper end of the other gas pipe is branched into a second air inlet 7-2 and a second exhaust port 8-2. The liquid inlet pipe 5 is branched into two branch liquid inlet pipes 9 that are respectively inserted into the bottoms of the two liquid chambers 3. The liquid discharge pipe 6 is branched into two branch liquid discharge pipes 10 that are respectively inserted into the bottoms of the two liquid chambers 3. One-way liquid inlet valves 11 are provided at the lower ends of the two branch liquid inlet pipes 9. One-way liquid discharge valves 12 are provided at the lower ends of the two branch liquid discharge pipes 10. The one-way liquid inlet valve 11 can only allow the liquid to flow from the branch liquid inlet pipe into the liquid chamber, rather than allowing the liquid in the liquid chamber to flow out from the branch liquid inlet pipe; the one-way liquid discharge valve 12 can only allow the liquid in the liquid chamber to flow out from the branch liquid discharge pipe 10, and cannot allow the liquid to flow into the liquid chamber from the branch liquid discharge pipe.

[0023] When the air inlet of one of the gas pipes is closed and the exhaust port is opened, the exhaust port continuously sucks the gas in the corresponding cavity. Because a negative pressure environment will be formed in the liquid chamber 3 of this cavity at this time, chemicals can be inhaled through the branch liquid inlet pipe 9 corresponding to this liquid chamber. Since the end of the branch liquid discharge pipe 10 corresponding to this liquid chamber is equipped with a one-way liquid discharge valve 12, it is natural that the chemicals cannot be inhaled. After the liquid inhaled into this liquid chamber reaches a certain amount, the air inlet of this gas pipe can be switched to open and the exhaust port can be closed. By introducing compressed nitrogen into the air inlet, the air pressure in the corresponding cavity can be increased. The increased air pressure in the corresponding liquid chamber will press the liquid already inhaled into this liquid chamber to be discharged from this liquid chamber through the branch liquid discharge pipe of this liquid chamber. Since the end of the branch liquid inlet pipe 9 corresponding to this liquid chamber is equipped with a one-way liquid inlet valve 12, naturally no liquid will be discharged from the branch liquid inlet pipe 9, thus realizing the function of transferring chemicals.

[0024] In this embodiment, since two cavities are adopted, the two gas pipes can be alternately inhaled and inflated, and thus the two liquid chambers can be alternately sucked and discharged, that is, while one liquid chamber is sucking liquid, the other liquid chamber is discharging liquid. When the liquid suction and discharge of the two cavities are staggered, the chemicals can be discharged in a staggered manner. By reducing the gap of chemical discharge (even without a gap), the transfer pulsation can be reduced to achieve the stable transfer of chemicals and avoid the generation of water hammer phenomenon.

[0025] Since this chemical transfer pump does not contain vulnerable moving parts, it has the advantage of a long service life.

[0026] All parts of the chemical transfer pump, including the cavity, cover, inlet pipe, outlet pipe, air pipe, and one-way inlet valve and one-way outlet valve, are made of PFA or PTFE. Since both PFA and PTFE materials have excellent chemical stability, corrosion resistance, and high thermal stability, they can protect these components from being eroded by chemicals, further extend the service life of the chemical transfer pump, and also avoid chemical contamination.

[0027] As shown by Figure 1 , a low-level sensor 13, a high-level sensor 14, and a safety-level sensor 15 are successively installed in the liquid cavity 3 from bottom to top, and the height of the safety-level sensor 15 is lower than that of the exchange port 4.

[0028] The above is the chemical transfer pump of the present utility model. When it is applied to a chemical transfer system as shown by Figure 5 , stable transfer of chemicals can be achieved. The chemical transfer system includes a chemical transfer pump, an inlet pipeline 16, an outlet pipeline, a first inlet air pipeline 18-1, a first exhaust air pipeline 19-1, a second inlet air pipeline 18-2, and a second exhaust air pipeline 19-2.

[0029] Among them, the inlet pipe 5 of the chemical transfer pump is connected to the inlet pipeline 16, the outlet pipe 6 is connected to the outlet pipeline, the first air inlet 7-1 is connected to the first inlet air pipeline 18-1, the first air outlet 8-1 is connected to the first exhaust air pipeline 19-1, the second air inlet 7-2 is connected to the second inlet air pipeline 18-2, and the second air outlet 8-2 is connected to the second exhaust air pipeline 19-2.

[0030] The liquid inlet pipeline 16 is provided with a liquid inlet pressure reducing valve 20 and a liquid inlet switch valve 21 connected to the liquid inlet pressure reducing valve 20, and the liquid inlet switch valve 21 is further connected to the liquid inlet pipe 5. The liquid discharge pipeline is provided with a liquid discharge switch valve 22 connected to the liquid discharge pipe 6. The first air inlet pipeline 18-1 is provided with a first air inlet pressure reducing valve 23-1 and a first air inlet switch valve 24-1 connected to the first air inlet pressure reducing valve 23-1, and the first air inlet switch valve 24-1 is connected to the first air inlet 7-1. The second air inlet pipeline 18-2 is provided with a second air inlet pressure reducing valve 23-2 and a second air inlet switch valve 24-2 connected to the second air inlet pressure reducing valve 23-2, and the second air inlet switch valve 24-2 is connected to the second air inlet 7-2. The first exhaust pipeline 19-1 is provided with a first vacuum generator 26-1, a first compressed gas pressure reducing valve 25-1 connected to the air inlet of the first vacuum generator 26-1, and a first exhaust switch valve 27-1 connected to the suction port of the first vacuum generator 26-1, and the first exhaust switch valve 27-1 is connected to the first exhaust port 8-1. The second exhaust pipeline 19-2 is provided with a second vacuum generator 26-2, a second compressed gas pressure reducing valve 25-2 connected to the air inlet of the first vacuum generator 26-1, and a second exhaust switch valve 27-2 connected to the suction port of the second vacuum generator 26-2, and the second exhaust switch valve 27-2 is connected to the second exhaust port 8-2.

[0031] The working mode of the chemical delivery system of this embodiment is as follows:

[0032] During operation, the liquid inlet switch valve 21 on the liquid inlet pipeline 16 is opened, the liquid discharge switch valve 22 on the liquid discharge pipeline is opened, and high-speed compressed gas is continuously introduced into the air inlets of the first vacuum generator 26-1 and the second vacuum generator 26-2 and ejected from the exhaust gas ports to keep them in the working state;

[0033] When the first air inlet switch valve 18-1 on the first air inlet pipeline 18-1 corresponding to the first cavity is opened, the second air inlet switch valve 24-2 on the second air inlet pipeline 18-2 corresponding to the second cavity is closed, the first exhaust switch valve 27-1 on the first exhaust pipeline 19-1 corresponding to the first cavity is closed, and the second exhaust switch valve 27-2 on the second exhaust pipeline 19-2 corresponding to the second cavity is opened. At this time, compressed nitrogen will enter the air cavity of the first cavity through the second air inlet pipeline 18-1, causing the air pressure in the first cavity to increase. The increased air pressure will compress the chemicals in the liquid cavity of the first cavity, and the chemicals will be discharged out of the liquid cavity through the branch liquid discharge pipe in the liquid cavity and then transported outward through the liquid discharge pipeline. At the same time, the second vacuum generator extracts the gas in the air cavity of the second cavity, causing the air pressure in the second cavity to decrease, forming a negative pressure. In this way, the external chemicals are sucked into the liquid cavity of the second cavity through the liquid inlet pipeline 16. This process realizes the discharge of chemicals from the liquid cavity of the first cavity and the suction of chemicals into the liquid cavity of the second cavity.

[0034] When the amount of chemicals entering the liquid chamber of the second cavity reaches a certain level, close the first intake switch valve 24-1 on the first intake pipeline 18-1 corresponding to the first cavity, open the second intake switch valve 24-2 on the second intake pipeline 18-2 corresponding to the second cavity, open the first exhaust switch valve 27-1 on the first exhaust pipeline 19-1 corresponding to the first cavity, and close the second exhaust switch valve 27-2 on the second exhaust pipeline 19-2 corresponding to the second cavity. In this way, the system is switched to let the liquid chamber of the second cavity discharge chemicals and the liquid chamber of the first cavity inhale chemicals.

[0035] When the amount of chemicals inhaled by the liquid chamber of the first cavity reaches a certain level, switch to let the liquid chamber of the first cavity discharge chemicals and the liquid chamber of the second cavity inhale chemicals as described above. Such an alternating cycle is carried out, thus realizing the continuous and stable conveyance of chemicals.

[0036] The timing of inhaling and discharging chemicals in the liquid chamber is controlled by the low-level sensor 13 and high-level sensor 14 on the liquid chamber. When the liquid level in the liquid chamber is at the position where the low-level sensor 13 is located, the liquid chamber starts to inhale chemicals; when the liquid level in the liquid chamber is at the position where the high-level sensor 14 is located, the liquid chamber discharges chemicals. The safety level sensor 15 serves as a liquid level warning. Once the liquid level in the liquid chamber reaches the position where the safety level sensor 15 is located, the system stops working and issues an alarm.

[0037] To achieve the automated operation of the system, the liquid inlet switch valve 21, liquid discharge switch valve 22, first intake switch valve 24-1, second intake switch valve 24-2, first exhaust switch valve 27-1, second exhaust switch valve 27-2, low-level sensor 13, high-level sensor 14, and safety level sensor 15 are all electrically connected to the controller. The controller can control the opening and closing of each switch valve according to the sensed changes in the liquid levels in the two liquid chambers by each level sensor, thereby realizing the automated operation of the system.

[0038] In this embodiment, the liquid pressure entering the liquid chamber can be adjusted by the liquid inlet pressure reducing valve 20, and the gas pressure entering the gas chamber can be adjusted by the first intake pressure reducing valve 23-1 and second intake pressure reducing valve 23-2.

[0039] In addition, a pressure gauge 28 is respectively installed at the rear position of the liquid inlet pressure reducing valve 20 in the liquid inlet pipeline 16, at the rear position of the first intake pressure reducing valve 23-1 in the first intake pipeline 18-1, at the rear position of the second intake pressure reducing valve 23-2 in the second intake pipeline 18-2, at the rear position of the first compressed gas pressure reducing valve 25-1 in the first exhaust pipeline 19-1, and at the rear position of the second compressed gas pressure reducing valve 25-2 in the second exhaust pipeline 19-2. A flow meter 29 is installed at the rear position of the liquid discharge switch valve 22 in the liquid discharge pipeline 17.

[0040] The pressure state of the current pipeline is obtained by observing the reading of the pressure gauge 28, and then according to the flow requirements of different pipelines, the pressure of each pipeline is adjusted by the pressure reducing valve respectively. The flow rate of the current chemical delivery is also obtained by observing the reading of the flow meter 29, and whether the chemical delivery is stable can be observed.

[0041] In this embodiment, both the first vacuum generator 26-1 and the second vacuum generator 26-2 are jet vacuum generators. Using Bernoulli's principle, compressed gas is introduced into the air inlet of the vacuum generator (in this embodiment, the port connected to the compressed gas pressure reducing valve), and after flowing at high speed inside, it is discharged from the exhaust port. The gas flowing at high speed inside will cause a negative pressure at the air suction port (i.e., the port connected to the exhaust switch valve), thereby sucking the gas in the cavity.

[0042] Of course, the first vacuum generator 26-1 and the second vacuum generator 26-2 can also adopt other types of vacuum generators, or directly use a vacuum pump to evacuate the air cavity.

[0043] It can be seen from the above detailed description that the chemical delivery pump of the present utility model has the advantages of having no vulnerable moving parts inside, a long service life, and being able to deliver chemicals smoothly, and can avoid the generation of water hammer phenomenon.

Claims

1. A chemical transfer pump, characterized in that: It includes a cavity and a cover (1) covering the mouth of the cavity. There are two isolated cavities in the cavity, and the cavities are further divided into a gas chamber (2) and a liquid chamber (3); there is a communicating exchange port (4) at the top of the gas chamber (2) and the liquid chamber (3); an inlet pipe (5), a drain pipe (6), and two gas pipes are provided on the cover (1); the lower ends of the two gas pipes are respectively led into the two gas chambers (2), and the upper end of one of the gas pipes is branched into a first air inlet (7-1) and a first exhaust port (8-1), and the upper end of the other gas pipe is branched into a second air inlet (7-2) and a second exhaust port (8-2); the inlet pipe (5) is branched into two branch inlet pipes (9) respectively inserted into the bottoms of the two liquid chambers (3); the drain pipe (6) is branched into two branch drain pipes (10) respectively inserted into the bottoms of the two liquid chambers (3); one-way inlet valves (11) are provided at the lower ends of the two branch inlet pipes (9); one-way drain valves (12) are provided at the lower ends of the two branch drain pipes (10).

2. The chemical feed pump according to claim 1, characterized in that: A low-level sensor (13), a high-level sensor (14), and a safety-level sensor (15) are successively installed in the liquid chamber (3) from bottom to top; the height of the safety-level sensor (15) is lower than that of the exchange port (4).

3. The chemical feed pump according to claim 1, characterized in that: The materials of the cavity, the cover (1), the inlet pipe (5), the drain pipe (6), the gas pipes, the one-way inlet valve (11), and the one-way drain valve (12) are all made of PFA or PTFE.

4. The chemical transfer pump according to claim 1, wherein: The gases introduced into the first air inlet (7-1) and the second air inlet (7-2) are nitrogen.

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