Chemical delivery system

Abstract

A chemical delivery system, comprising a liquid inlet pipe, a liquid discharge pipe, a first gas inlet pipe, a first gas discharge pipe, a second gas inlet pipe, a second gas discharge pipe, and a chemical delivery pump. The chemical delivery pump comprises a chamber and a sealing cover covering the opening of the chamber; two independent cavities are provided inside the chamber; each cavity is further divided into a gas cavity and a liquid cavity; the gas cavity and the liquid cavity are communicated with each other at the top; a liquid inlet pipe, a liquid discharge pipe, and two gas pipes are provided on the sealing cover; the lower ends of the gas pipes are respectively communicated with the two gas cavities, and the upper ends of the two gas pipes each are split into a gas inlet and a gas outlet; the liquid inlet pipe is provided with two branch liquid inlet pipes respectively inserted into the two liquid cavities; and the liquid discharge pipe is provided with two branch liquid discharge pipes respectively inserted into the two liquid cavities. A pump device used by the chemical delivery system does not contain a wear-prone component, and has a long service life. Moreover, the system has the advantage of smooth chemical delivery, thereby preventing water hammer.

Description

Chemical delivery system TECHNICAL FIELD

[0001] The present application belongs to the technical field of fluid delivery, and particularly relates to a chemical delivery system. BACKGROUND

[0002] Chemical delivery pumps are used in the chemical delivery system. The chemical delivery pump is a delivery pump with strong corrosion resistance and stability, plays a core role in the chemical industry and related fields, and is widely used in the delivery of various chemical media, including corrosive, flammable and explosive, and toxic and harmful liquids, can effectively prevent medium leakage, and ensure the safety of the delivery environment.

[0003] Service life is an important indicator of the chemical delivery pump. The existing chemical delivery pump is generally a wind bag pump and a diaphragm pump, and the diaphragm and the wind bag inside are the key moving parts and the vulnerable parts inside the pump. Since the diaphragm and the wind bag are inevitably subject to wear and tear and have a short service life, the service life of the chemical delivery pump is also limited.

[0004] In addition, the existing chemical delivery pump is generally of a pulsating type in the flow type of the delivered chemicals, and the delivery is unstable, which can cause the flow speed of the chemicals in the pipeline to be uneven, and thus affect the overall delivery efficiency.

[0005] And in the case of large flow delivery, the unstable delivery can also cause the water hammer phenomenon, which can cause damage to the delivery pipeline and cause chemical leakage, which has a major safety hazard. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a chemical delivery system, which does not contain vulnerable moving parts in the pump equipment used in the system, has a long service life and stable delivery.

[0007] To solve the above technical problems, the present application adopts the following technical solutions:

[0008] A chemical delivery system, comprising a liquid inlet pipeline, a liquid outlet pipeline, a first air inlet pipeline, a first air outlet pipeline, a second air inlet pipeline, a second air outlet pipeline and a chemical delivery pump;

[0009] The chemical conveying pump comprises a cavity and a cover cap covering the mouth of the cavity, the cavity has two cavities isolated from each other, the cavities are divided into gas cavities and liquid cavities, the gas cavities and the liquid cavities are communicated at the top, the cover cap is provided with a liquid inlet pipe, a liquid outlet pipe and two gas pipes, the lower ends of the two gas pipes are respectively communicated into the two gas cavities, the upper end of one of the two gas pipes is branched into a first gas inlet and a first gas outlet, the upper end of the other gas pipe is branched into a second gas inlet and a second gas outlet, the liquid inlet pipe is branched into two branch liquid inlet pipes which are respectively inserted into the bottoms of the two liquid cavities, the liquid outlet pipe is branched into two branch liquid outlet pipes which are respectively inserted into the bottoms of the two liquid cavities, the lower ends of the two branch liquid inlet pipes are respectively provided with a one-way liquid inlet valve, and the lower ends of the two branch liquid outlet pipes are respectively provided with a one-way liquid outlet valve.

[0010] The liquid inlet pipe is connected with a liquid inlet pipeline, the liquid outlet pipe is connected with a liquid outlet pipeline, the first gas inlet is connected with a first gas inlet pipeline, the first gas outlet is connected with a first gas outlet pipeline, the second gas inlet is connected with a second gas inlet pipeline, and the second gas outlet is connected with a second gas outlet pipeline.

[0011] In the above chemical conveying system, the chemical conveying pump used has only the liquid inlet pipe, the liquid outlet pipe and the two gas pipes in the cavity, and the gas cavities and the liquid cavities are communicated only at the top, so that the gas pressure in the liquid cavities can be controlled through the gas pipes to provide power for the liquid, thereby controlling the entry and exit of the chemicals in the liquid cavities and realizing the effect of conveying chemicals, so that the equipment does not contain movable parts which are easy to be damaged, and the service life of the equipment is long. Since the cavity has two cavities which are isolated from each other, and only the two branch liquid inlet pipes and the two branch liquid outlet pipes intersect, the function of the two cavities to suck and discharge chemicals is not affected, so the two cavities can work independently, but by controlling the two groups of cavities to work alternately, the function of low-pulse chemical output can be realized, and the chemicals can be output stably.

[0012] The liquid inlet pipeline has a liquid inlet pressure reducing valve and a liquid inlet switch valve connected with the liquid inlet pressure reducing valve, the liquid inlet switch valve is connected with the liquid inlet pipe, the liquid outlet pipeline has a liquid outlet switch valve connected with the liquid outlet pipe, the first gas inlet pipeline has a first gas inlet pressure reducing valve and a first gas inlet switch valve connected with the first gas inlet pressure reducing valve, the first gas inlet switch valve is connected with the first gas inlet, the second gas inlet pipeline has a second gas inlet pressure reducing valve and a second gas inlet switch valve connected with the second gas inlet pressure reducing valve, the second gas inlet switch valve is connected with the second gas inlet, the first gas outlet pipeline has a first vacuum generator, a first compressed gas pressure reducing valve connected with the gas inlet of the first vacuum generator, and a first gas outlet switch valve connected with the gas suction port of the first vacuum generator, the first gas outlet switch valve is connected with the first gas outlet, and the second gas outlet pipeline has a second vacuum generator, a second compressed gas pressure reducing valve connected with the gas inlet of the second vacuum generator, and a second gas outlet switch valve connected with the gas suction port of the second vacuum generator, the second gas outlet switch valve is connected with the second gas outlet.

[0013] Because each pipeline is provided with a switch valve, the substance can be controlled to enter or exit by controlling the switch of each pipeline, thereby realizing the control of the chemical delivery pump.

[0014] Because the first exhaust pipeline and the second exhaust pipeline are provided with vacuum generators, the vacuum generators can alternately cause the first exhaust pipeline or the second exhaust pipeline to suck the gas in the two cavities, alternately form negative pressure in the two liquid cavities, and cause the two liquid cavities to alternately suck in the chemicals. Then, nitrogen gas is alternately introduced into the two cavities through the first gas inlet or the second gas inlet, alternately forms positive pressure in the two liquid cavities to press the liquid in the liquid cavities, and causes the two liquid cavities to alternately discharge the chemicals. In this way, one cavity can be used to discharge liquid while the other cavity is used to suck liquid, and the pump can realize continuous and smooth pumping of the chemicals by alternating operation. In the chemical delivery pump, the liquid cavities are sequentially provided with a low liquid level sensor, a high liquid level sensor and a safety liquid level sensor from bottom to top, and the height of the safety liquid level sensor is lower than the exchange port. The height of the liquid level in the current liquid cavity can be known through the different liquid level sensors, so that the timing of the chemical suction or discharge can be more accurately controlled, and the working efficiency of the chemical delivery pump can be improved. The height of the chemical liquid surface can be lowered than the exchange port through the safety liquid level sensor, so that the chemicals can be prevented from flowing into the gas cavity, and the equipment can be protected.

[0015] In the chemical delivery pump, the materials of the cavity, the cover, the liquid inlet pipe, the liquid outlet pipe, the gas pipe, and the one-way liquid inlet valve and the one-way liquid outlet valve are PFA or PTFE. Because PFA and PTFE have excellent chemical stability, corrosion resistance and high thermal stability, these components can be protected from chemical corrosion, the service life of the chemical delivery pump can be further prolonged, and the chemicals can be prevented from being contaminated.

[0016] In the chemical delivery pump, the gas introduced into the first gas inlet and the second gas inlet is nitrogen. Because nitrogen is an inert gas, it has excellent chemical stability and is not easy to react with chemicals, so the chemicals can be protected from contamination.

[0017] In the system, a pressure gauge is installed at a position behind the liquid inlet pressure reducing valve in the liquid inlet pipeline, a position behind the first gas inlet pressure reducing valve in the first gas inlet pipeline, a position behind the second gas inlet pressure reducing valve in the second gas inlet pipeline, a position behind the first compressed gas pressure reducing valve in the first exhaust pipeline, and a position behind the second compressed gas pressure reducing valve in the second exhaust pipeline. A flow meter is installed at a position behind the liquid outlet switch valve in the liquid outlet pipeline. The pressure state of the current pipeline can be known by observing the reading of the pressure gauge, and the pressure of each pipeline can be adjusted through the pressure reducing valve according to the flow demand of different pipelines, so as to further stabilize the delivery.

[0018] In order to improve the pumping flow, the present application further provides another chemical delivery system, comprising liquid inlet pipeline, liquid outlet pipeline, first air inlet pipeline, first air outlet pipeline, second air inlet pipeline, second air outlet pipeline and a plurality of chemical delivery pumps;

[0019] The chemical delivery pump comprises a cavity and a cover on the mouth of the cavity, and the cavity has two cavities isolated from each other, and the cavities are divided into air cavities and liquid cavities, and the air cavities and the liquid cavities have exchange ports at the top, the cover is provided with liquid inlet pipes, liquid outlet pipes and two air pipes, the lower ends of the two air pipes are respectively connected to the two air cavities, the upper end of one of the air pipes is branched into a first air inlet port and a first air outlet port, the upper end of the other air pipe is branched into a second air inlet port and a second air outlet port, the liquid inlet pipes are branched into two branch liquid inlet pipes respectively inserted into the bottoms of the two liquid cavities, the liquid outlet pipes are branched into two branch liquid outlet pipes respectively inserted into the bottoms of the two liquid cavities, the lower ends of the two branch liquid inlet pipes are respectively provided with one-way liquid inlet valves, and the lower ends of the two branch liquid outlet pipes are respectively provided with one-way liquid outlet valves.

[0020] Each liquid inlet pipe is connected to the liquid inlet pipeline, each liquid outlet pipe is connected to the liquid outlet pipeline, each first air inlet port is connected to the first air inlet pipeline, each first air outlet port is connected to the first air outlet pipeline, each second air inlet port is connected to the second air inlet pipeline, and each second air outlet port is connected to the second air outlet pipeline. The liquid inlet pipeline has a liquid inlet pressure reducing valve and a plurality of liquid inlet switch valves connected in parallel with the liquid inlet pressure reducing valve, each liquid inlet switch valve is connected to each liquid inlet pipe, the liquid outlet pipeline has a liquid outlet switch valve connected in parallel with each liquid outlet pipe, the first air inlet pipeline has a first air inlet pressure reducing valve and a plurality of first air inlet switch valves connected in parallel with the first air inlet pressure reducing valve, each first air inlet switch valve is connected to each first air inlet port, the second air inlet pipeline has a second air inlet pressure reducing valve and a plurality of second air inlet switch valves connected in parallel with the second air inlet pressure reducing valve, each second air inlet switch valve is connected to each second air inlet port, the first air outlet pipeline has a first vacuum generator, a first compressed air pressure reducing valve connected to the air inlet port of the first vacuum generator, and a plurality of first air outlet switch valves connected in parallel with the air suction port of the first vacuum generator, each first air outlet switch valve is connected to each first air outlet port, and the second air outlet pipeline has a second vacuum generator, a second compressed gas pressure reducing valve connected to the air inlet port of the second vacuum generator, and a plurality of second air outlet switch valves connected in parallel with the air suction port of the second vacuum generator, each second air outlet switch valve is connected to each second air outlet port.

[0021] By using the above technical scheme, since each pipe port of each chemical delivery pump is connected to the pipeline, the plurality of chemical delivery pumps can be simultaneously supplied or sucked with substances through the pipelines, so that more chemical delivery pumps can be simultaneously added to the transportation, and the pumping flow of the chemical delivery pump is improved.

[0022] In the system, a pressure gauge is installed at a position behind the liquid inlet pressure reducing valve in the liquid inlet pipeline, a position behind the first gas inlet pressure reducing valve in the first gas inlet pipeline, a position behind the second gas inlet pressure reducing valve in the second gas inlet pipeline, a position behind the first compressed gas pressure reducing valve in the first gas outlet pipeline, and a position behind the second compressed gas pressure reducing valve in the second gas outlet pipeline, respectively, and a flow meter is installed at a position behind the liquid outlet on-off valve in the liquid outlet pipeline.

[0023] By using the above technical scheme, the chemical conveying system has the advantages that the pump device has no easily-damaged moving parts inside, has a long service life, and the system has the advantage of stable chemical conveying, and can avoid the generation of water hammer phenomenon. BRIEF DESCRIPTION OF DRAWINGS

[0024] The application will be further described in detail below in combination with the drawings and specific embodiments:

[0025] Fig. 1 is a structural schematic view of the chemical conveying pump of the application;

[0026] Fig. 2 is a schematic view of the internal structure of the chemical conveying pump of the application with the cavity hidden;

[0027] Fig. 3 is a sectional view of the cavity inside the chemical conveying pump of the application;

[0028] Fig. 4 is a top view of the chemical conveying pump of the application;

[0029] Fig. 5 is a pipeline diagram of the chemical conveying system of Example 1;

[0030] Fig. 6 is a pipeline diagram of the chemical conveying system of Example 2.

[0031] Marked in the figure: 1, cover; 2, gas cavity; 3, liquid cavity; 4, exchange port; 5, liquid inlet pipe; 6, liquid outlet pipe; 7-1, first gas inlet; 7-2, second gas inlet; 8-1, first gas outlet; 8-2, second gas outlet; 9, branch liquid inlet pipe; 10, branch liquid outlet pipe; 11, one-way liquid inlet valve; 12, one-way liquid outlet valve; 13, low liquid level sensor; 14, high liquid level sensor; 15, safety liquid level sensor; 16, liquid inlet pipeline; 17, liquid outlet pipeline; 18-1, first gas inlet pipeline; 18-2, second gas inlet pipeline; 19-1, first gas outlet pipeline; 19-2, second gas outlet pipeline; 20, liquid inlet pressure reducing valve; 21, liquid inlet on-off valve; 22, liquid outlet on-off valve; 23-1, first gas inlet pressure reducing valve; 23-2, second gas inlet pressure reducing valve; 24-1, first gas inlet on-off valve; 24-2, second gas inlet on-off 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 gas outlet on-off valve; 27-2, second gas outlet on-off valve; 28, pressure gauge; 29, flow meter. DETAILED DESCRIPTION

[0032] The application will be further described in detail below with reference to the accompanying drawings and specific embodiments

[0033] Example 1

[0034] As shown in Fig. 5, the chemical delivery system of the present embodiment comprises a liquid inlet pipeline 16, a liquid outlet pipeline, a first gas inlet pipeline 18-1, a first gas outlet pipeline 19-1, a second gas inlet pipeline 18-2, a second gas outlet pipeline 19-2, and a chemical delivery pump.

[0035] As shown in Figs. 1 to 4, the chemical delivery pump comprises a cavity and a cover 1 covering the mouth of the cavity, and has two cavities (i.e. a first cavity and a second cavity) in the cavity. The two cavities are each divided into a gas cavity 2 and a liquid cavity 3. The gas cavity 2 and the liquid cavity 3 have a communication exchange port 4 at the top. The cover 1 is provided with a liquid inlet pipe 5, a liquid outlet pipe 6, and two gas pipes. The lower ends of the two gas pipes respectively lead into the two gas cavities 2. The upper end of one of the two gas pipes branches into a first gas inlet 7-1 and a first gas outlet 8-1, and the upper end of the other gas pipe branches into a second gas inlet 7-2 and a second gas outlet 8-2. The liquid inlet pipe 5 branches into two branch liquid inlet pipes 9 which are respectively inserted into the bottoms of the two liquid cavities 3. The liquid outlet pipe 6 branches into two branch liquid outlet pipes 10 which are respectively inserted into the bottoms of the two liquid cavities 3. The lower ends of the two branch liquid inlet pipes 9 are each provided with a one-way liquid inlet valve 11. The lower ends of the two branch liquid outlet pipes 10 are each provided with a one-way liquid outlet valve 12. The one-way liquid inlet valve 11 can only allow liquid to flow from the branch liquid inlet pipe into the liquid cavity, but not allow liquid in the liquid cavity to flow out of the branch liquid inlet pipe. The one-way liquid outlet valve 12 can only allow liquid in the liquid cavity to flow out of the branch liquid outlet pipe, but not allow liquid to flow from the branch liquid outlet pipe into the liquid cavity.

[0036] When the gas inlet of one of the air tubes is closed and the gas outlet is opened, the gas outlet continuously sucks the gas in the corresponding cavity, because a negative pressure environment is formed in the liquid cavity 3 of the cavity at this time, and then the chemical can be sucked in through the corresponding branch liquid inlet pipe 9 of the liquid cavity, and since the end of the branch liquid outlet pipe 10 corresponding to the liquid cavity is provided with a one-way liquid outlet valve 12, the chemical cannot be sucked in. When the liquid sucked in the liquid cavity reaches a certain amount, the gas inlet of the air tube can be switched to be opened and the gas outlet to be closed, and by passing compressed nitrogen into the gas inlet, the gas pressure in the corresponding cavity can be increased, and the increased gas pressure in the corresponding liquid cavity can press the liquid sucked in the liquid cavity to be discharged from the liquid cavity through the branch liquid outlet pipe of the liquid cavity. Since the end of the branch liquid inlet pipe 9 corresponding to the liquid cavity is provided with a one-way liquid inlet valve 12, liquid cannot be discharged from the branch liquid inlet pipe 9, thereby realizing the function of transporting chemicals.

[0037] Since two cavities are used in the embodiment, the two air tubes can be alternately used for gas suction and inflation, and then the two liquid cavities can be alternately used for liquid suction and discharge, that is, while one liquid cavity is used for liquid suction, the other liquid cavity is used for liquid discharge. When the liquid suction and discharge of the two cavities are staggered, the chemicals can be staggered to be discharged, the interval of chemical discharge can be reduced (even without interval), the delivery pulsation can be reduced, the stable delivery of chemicals can be realized, and the generation of water hammer phenomenon can be avoided.

[0038] Since the chemical delivery pump does not contain movable parts that are prone to damage, it has the advantage of long service life.

[0039] The materials of all parts of the chemical delivery pump, including the cavity, the cover, the liquid inlet pipe, the liquid outlet pipe, the air tube, and the one-way liquid inlet valve and the one-way liquid outlet valve, are PFA or PTFE. Since PFA and PTFE materials have excellent chemical stability, corrosion resistance and high thermal stability, these parts can be protected from chemical corrosion, the service life of the chemical delivery pump can be further prolonged, and the chemical can also be prevented from being contaminated.

[0040] As shown in FIG. 1, the liquid cavity 3 is sequentially provided with a low liquid level sensor 13, a high liquid level sensor 14 and a safety liquid level sensor 15 from bottom to top, and the height of the safety liquid level sensor 15 is lower than that of the exchange port 4.

[0041] As shown in FIG. 5, the liquid inlet pipe 5 of the chemical delivery pump is connected to a liquid inlet pipe 16, the liquid outlet pipe 6 is connected to a liquid outlet pipe, the first gas inlet 7-1 is connected to a first gas inlet pipe 18-1, the first gas outlet 8-1 is connected to a first gas outlet pipe 19-1, the second gas inlet 7-2 is connected to a second gas inlet pipe 18-2, and the second gas outlet 8-2 is connected to a second gas outlet pipe 19-2.

[0042] The liquid inlet pipeline 16 has 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 connected to the liquid inlet pipeline 5. The liquid outlet pipeline has a liquid outlet switch valve 22 connected to the liquid outlet pipeline 6. The first gas inlet pipeline 18-1 has a first gas inlet pressure reducing valve 23-1 and a first gas inlet switch valve 24-1 connected to the first gas inlet pressure reducing valve 23-1, and the first gas inlet switch valve 24-1 is connected to the first gas inlet 7-1. The second gas inlet pipeline 18-2 has a second gas inlet pressure reducing valve 23-2 and a second gas inlet switch valve 24-2 connected to the second gas inlet pressure reducing valve 23-2, and the second gas inlet switch valve 24-2 is connected to the second gas inlet 7-2. The first gas outlet pipeline 19-1 has a first vacuum generator 26-1, a first compressed gas pressure reducing valve 25-1 connected to the gas inlet of the first vacuum generator 26-1, and a first gas outlet switch valve 27-1 connected to the gas suction inlet of the first vacuum generator 26-1, and the first gas outlet switch valve 27-1 is connected to the first gas outlet 8-1. The second gas outlet pipeline 19-2 has a second vacuum generator 26-2, a second compressed gas pressure reducing valve 25-2 connected to the gas inlet of the first vacuum generator 26-1, and a second gas outlet switch valve 27-2 connected to the gas suction inlet of the second vacuum generator 26-2, and the second gas outlet switch valve 27-2 is connected to the second gas outlet 8-2.

[0043] The working mode of the chemical delivery system of the embodiment is as follows:

[0044] In operation, the liquid inlet switch valve 21 on the liquid inlet pipeline 16 is opened, the liquid outlet switch valve 22 on the liquid outlet pipeline is opened, and the gas inlets of the first vacuum generator 26-1 and the second vacuum generator 26-2 are continuously connected to the high-speed compressed gas and discharged from the exhaust port to keep them in working condition.

[0045] When the first gas inlet switch valve 18-1 on the first gas inlet pipeline 18-1 corresponding to the first cavity is opened, the second gas inlet switch valve 24-2 on the second gas inlet pipeline 18-2 corresponding to the second cavity is closed, the first gas outlet switch valve 27-1 on the first gas outlet pipeline 19-1 corresponding to the first cavity is closed, and the second gas outlet switch valve 27-2 on the second gas outlet pipeline 19-2 corresponding to the second cavity is opened. At this time, the compressed nitrogen gas enters the gas cavity of the first cavity through the second gas inlet pipeline 18-1, so that the gas pressure in the first cavity rises, and the rising gas pressure presses the chemical in the liquid cavity of the first cavity, which is discharged from the liquid cavity through the branch liquid outlet pipeline and then delivered outward through the liquid outlet pipeline. At the same time, the second vacuum generator extracts the gas in the gas cavity of the second cavity, so that the gas pressure in the second cavity decreases to form a negative pressure, so that the external chemical is sucked into the liquid cavity of the second cavity through the liquid inlet pipeline 16. This process realizes the discharge of the chemical from the liquid cavity of the first cavity and the suction of the chemical into the liquid cavity of the second cavity.

[0046] When the liquid cavity of the second cavity absorbs a certain amount of chemical, the first inlet switch valve 24-1 corresponding to the first cavity on the first inlet pipeline 18-1 is closed, the second inlet switch valve 24-2 corresponding to the second cavity on the second inlet pipeline 18-2 is opened, the first exhaust switch valve 27-1 corresponding to the first cavity on the first exhaust pipeline 19-1 is opened, and the second exhaust switch valve 27-2 corresponding to the second cavity on the second exhaust pipeline 19-2 is closed. In this way, the liquid cavity of the second cavity is switched to discharge the chemical, and the liquid cavity of the first cavity is switched to absorb the chemical.

[0047] When the liquid cavity of the first cavity absorbs a certain amount of chemical, the first inlet switch valve 24-1 corresponding to the first cavity on the first inlet pipeline 18-1 is closed, the second inlet switch valve 24-2 corresponding to the second cavity on the second inlet pipeline 18-2 is opened, the first exhaust switch valve 27-1 corresponding to the first cavity on the first exhaust pipeline 19-1 is opened, and the second exhaust switch valve 27-2 corresponding to the second cavity on the second exhaust pipeline 19-2 is closed. In this way, the liquid cavity of the second cavity is switched to discharge the chemical, and the liquid cavity of the first cavity is switched to absorb the chemical.

[0048] The timing of the chemical absorption and discharge in the liquid cavity is controlled by the low liquid level sensor 13 and the high liquid level sensor 14. When the liquid level in the liquid cavity is at the position of the low liquid level sensor 13, the liquid cavity begins to absorb the chemical; when the liquid level in the liquid cavity is at the position of the high liquid level sensor 14, the liquid cavity discharges the chemical. The safety liquid level sensor 15 serves as a liquid level warning function. Once the liquid level in the liquid cavity reaches the position of the safety liquid level sensor 15, the system stops working and sends an alarm.

[0049] To realize the automatic operation of the system, the liquid inlet switch valve 21, the liquid discharge switch valve 22, the first inlet switch valve 24-1, the second inlet switch valve 24-2, the first exhaust switch valve 27-1, the second exhaust switch valve 27-2, the low liquid level sensor 13, the high liquid level sensor 14, and the safety liquid level sensor 15 are electrically connected to the controller. The controller can control the opening and closing of each switch valve and the start and stop of each vacuum generator according to the changes in the liquid level in the two liquid cavities sensed by each liquid level sensor, thereby realizing the automatic operation of the system.

[0050] In this embodiment, the liquid pressure entering the liquid cavity can be adjusted by the liquid inlet pressure reducing valve 20, and the gas pressure entering the gas cavity can be adjusted by the first inlet pressure reducing valve 23-1 and the second inlet pressure reducing valve 23-2.

[0051] In addition, a pressure gauge 28 is installed at a position behind the liquid inlet pressure reducing valve 20 in the liquid inlet pipeline 16, a position behind the first gas inlet pressure reducing valve 23-1 in the first gas inlet pipeline 18-1, a position behind the second gas inlet pressure reducing valve 23-2 in the second gas inlet pipeline 18-2, a position behind the first compressed gas pressure reducing valve 25-1 in the first gas outlet pipeline 19-1, and a position behind the second compressed gas pressure reducing valve 25-2 in the second gas outlet pipeline 19-2. A flow meter 29 is installed at a position behind the liquid outlet on-off valve 22 in the liquid outlet pipeline 17.

[0052] The pressure state of the current pipeline can be observed by observing the reading of the pressure gauge 28, and the pressure of each pipeline can be adjusted by the pressure reducing valve according to the flow demand of different pipelines. The flow of the current chemical delivery can be observed by observing the reading of the flow meter 29, and whether the chemical delivery is stable can be observed.

[0053] In the embodiment, the first vacuum generator 26-1 and the second vacuum generator 26-2 are both jet vacuum generators, which adopt the Bernoulli principle. The compressed gas is introduced into the gas inlet (in the embodiment, the port connected with the compressed gas pressure reducing valve) of the vacuum generator, and then discharged from the exhaust port after high-speed flow in the internal. The high-speed flow of the gas in the internal can cause the suction port (the port connected with the exhaust on-off valve) to generate negative pressure, thereby sucking the gas in the cavity.

[0054] 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 adopt a vacuum pump to suck the gas in the cavity.

[0055] Embodiment 2

[0056] The chemical delivery pump of the present application can include several chemical delivery pumps used in embodiment 1.

[0057] The embodiment takes two chemical delivery pumps as an example. As shown in FIG. 6, the chemical delivery system of the embodiment includes two chemical delivery pumps in embodiment 1. Each liquid inlet pipeline 5 is connected with the liquid inlet pipeline 16, each liquid outlet pipeline 6 is connected with the liquid outlet pipeline 17, each first gas inlet port 7-1 is connected with the first gas inlet pipeline 18-1, each first gas outlet port 8-1 is connected with the first gas outlet pipeline 19-1, each second gas inlet port 7-2 is connected with the second gas inlet pipeline 18-2, and each second gas outlet port 8-2 is connected with the second gas outlet pipeline 19-2.

[0058] Since each port of each chemical delivery pump is connected with a pipeline, the multiple chemical delivery pumps can be simultaneously provided with or sucked with substances through the pipelines, so that more chemical delivery pumps can be simultaneously transported, and the pumping flow and the pumping efficiency can be improved.

[0059] Specifically, the liquid inlet pipeline 16 has a liquid inlet pressure reducing valve 20 and two liquid inlet switch valves 21 connected in parallel with the liquid inlet pressure reducing valve 20, and the two liquid inlet switch valves 21 are respectively connected to the liquid inlet pipes 5 of the two chemical delivery pumps. The liquid outlet pipeline 17 has a liquid outlet switch valve 22 connected in parallel to the liquid outlet pipes 6 of the two chemical delivery pumps. The first gas inlet pipeline 18-1 has a first gas inlet pressure reducing valve 23-1 and two first gas inlet switch valves 24-1 connected in parallel with the first gas inlet pressure reducing valve 23-1, and each first gas inlet switch valve 24-1 is respectively connected to the first gas inlet port 7-1 of each chemical delivery pump. The second gas inlet pipeline 18-2 has a second gas inlet pressure reducing valve 23-2 and two second gas inlet switch valves 24-2 connected in parallel with the second gas inlet pressure reducing valve 23-2, and each second gas inlet switch valve 24-2 is respectively connected to the second gas inlet port 7-2 of each chemical delivery pump. The first gas outlet pipeline 19-1 has a first vacuum generator 26-1, a first compressed gas pressure reducing valve 25-1 connected to the gas inlet port of the first vacuum generator 26-1, two first gas outlet switch valves 27-1 connected in parallel to the suction port of the first vacuum generator 26-1, and each first gas outlet switch valve 27-1 is respectively connected to the first gas outlet port 8-1 of each chemical delivery pump. The second gas outlet pipeline 19-2 has a second vacuum generator 26-2, a second compressed gas pressure reducing valve 25-2 connected to the gas inlet port of the second vacuum generator 26-2, two second gas outlet switch valves 27-2 connected in parallel to the suction port of the second vacuum generator 26-2, and each second gas outlet switch valve 27-2 is respectively connected to the second gas outlet port 8-2 of each chemical delivery pump.

[0060] Generally, a pressure gauge 28 is installed at the position behind the liquid inlet pressure reducing valve 20 in the liquid inlet pipeline 16, at the position behind the first gas inlet pressure reducing valve 23-1 in the first gas inlet pipeline 18-1, at the position behind the second gas inlet pressure reducing valve 23-2 in the second gas inlet pipeline 18-2, at the position behind the first compressed gas pressure reducing valve 25-1 in the first gas outlet pipeline 19-1, and at the position behind the second compressed gas pressure reducing valve 25-2 in the second gas outlet pipeline 19-2, and a flow meter 29 is installed at the position behind the liquid outlet switch valve 22 in the liquid outlet pipeline 6.

[0061] Since two chemical delivery pumps are used in parallel in this embodiment, the pumping flow rate and efficiency of this embodiment are twice those of embodiment 1 under the same working conditions.

Claims

1. A chemical delivery system characterized by: The chemical delivery pump comprises a cavity, and a cover (1) covering the mouth of the cavity, the cavity has two cavities isolated from each other, the cavities are divided into gas cavities (2) and liquid cavities (3); the gas cavities (2) and the liquid cavities (3) have a communication exchange port (4) at the top; the cover (1) is provided with a liquid inlet pipe (5), a liquid outlet pipe (6), two gas pipes; the lower ends of the two gas pipes respectively lead into the two gas cavities (2), the upper end of one of the gas pipes branches into a first gas inlet (7-1) and a first gas outlet (8-1), and the upper end of the other gas pipe branches into a second gas inlet (7-2) and a second gas outlet (8-2); the liquid inlet pipe (5) branches into two branch liquid inlet pipes (9) respectively inserted into the bottoms of the two liquid cavities (3); the liquid outlet pipe (6) branches into two branch liquid outlet pipes (10) respectively inserted into the bottoms of the two liquid cavities (3); the lower ends of the two branch liquid inlet pipes (9) are respectively provided with one-way liquid inlet valves (11); the lower ends of the two branch liquid outlet pipes (10) are respectively provided with one-way liquid outlet valves (12); The liquid inlet pipe (5) is connected with the liquid inlet pipe line (16), the liquid outlet pipe (6) is connected with the liquid outlet pipe line (17), the first gas inlet (7-1) is connected with the first gas inlet pipe line (18-1), the first gas outlet (8-1) is connected with the first gas outlet pipe line (19-1), the second gas inlet (7-2) is connected with the second gas inlet pipe line (18-2), and the second gas outlet (8-2) is connected with the second gas outlet pipe line (19-2). The liquid inlet pipe line (16) has a liquid inlet pressure reducing valve (20) and a liquid inlet switch valve (21) connected with the liquid inlet pressure reducing valve (20), and the liquid inlet switch valve (21) is further connected with the liquid inlet pipe (5); 2. The chemical delivery system of claim 1, wherein: The liquid outlet pipe line (17) has a liquid outlet switch valve (22) connected with the liquid outlet pipe (6); The first gas inlet pipe line (18-1) has a first gas inlet pressure reducing valve (23-1) and a first gas inlet switch valve (24-1) connected with the first gas inlet pressure reducing valve (23-1), and the first gas inlet switch valve (24-1) is connected with the first gas inlet (7-1); The second gas inlet pipe line (18-2) has a second gas inlet pressure reducing valve (23-2) and a second gas inlet switch valve (24-2) connected with the second gas inlet pressure reducing valve (23-2), and the second gas inlet switch valve (24-2) is connected with the second gas inlet (7-2); The first gas outlet pipe line (19-1) has a first vacuum generator (26-1), a first compressed gas pressure reducing valve (25-1) connected with the gas inlet of the first vacuum generator (26-1), and a first gas outlet switch valve (27-1) connected with the gas suction port of the first vacuum generator (26-1), and the first gas outlet switch valve (27-1) is connected with the first gas outlet (8-1); ​ The second exhaust pipeline (19-2) has a second vacuum generator (26-2), a second compressed gas pressure reducing valve (25-2) connected with the air inlet of the second vacuum generator (26-2), and a second exhaust switch valve (27-2) connected with the air 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).

3. The chemical delivery system of claim 2, wherein: A pressure gauge (28) is installed at a position behind the liquid inlet pressure reducing valve (20) in the liquid inlet pipeline (16), a position behind the first liquid inlet pressure reducing valve (23-1) in the first gas inlet pipeline (18-1), a position behind the second liquid inlet pressure reducing valve (23-2) in the second gas inlet pipeline (18-2), a position behind the first compressed gas pressure reducing valve (25-1) in the first exhaust pipeline (19-1), and a position behind the second compressed gas pressure reducing valve (25-2) in the second exhaust pipeline (19-2), respectively.

4. The chemical delivery system of claim 1, wherein: The liquid cavity (3) is sequentially provided with a low liquid level sensor (13), a high liquid level sensor (14) and a safety liquid level sensor (15) from bottom to top; the safety liquid level sensor (15) is lower than the exchange port (4).

5. The chemical delivery system of claim 1, wherein: The materials of the cavity, the cover (1), the liquid inlet pipe (5), the liquid outlet pipe (6), the gas pipe and the one-way liquid inlet valve (11) and the one-way liquid outlet valve (12) are PFA or PTFE.

6. The chemical delivery system of claim 1, wherein: The gas introduced into the first gas inlet port (7-1) and the second gas inlet port (7-2) is nitrogen.

7. A chemical delivery system characterized by: The chemical delivery pump comprises a cavity, and a cover (1) covering the mouth of the cavity, the cavity has two cavities isolated from each other, and the cavities are divided into a gas cavity (2) and a liquid cavity (3); the gas cavity (2) and the liquid cavity (3) have a communication exchange port (4) at the top; the cover (1) is provided with a liquid inlet pipe (5), a liquid outlet pipe (6) and two gas pipes; the lower ends of the two gas pipes are respectively introduced into the two gas cavities (2), the upper end of one of the gas pipes is branched into a first gas inlet port (7-1) and a first gas outlet port (8-1), and the upper end of the other gas pipe is branched into a second gas inlet port (7-2) and a second gas outlet port (8-2); the liquid inlet pipe (5) is branched into two branch liquid inlet pipes (9) inserted into the bottoms of the two liquid cavities (3); the liquid outlet pipe (6) is branched into two branch liquid outlet pipes (10) inserted into the bottoms of the two liquid cavities (3); the lower ends of the two branch liquid inlet pipes (9) are respectively provided with one-way liquid inlet valves (11); the lower ends of the two branch liquid outlet pipes (10) are respectively provided with one-way liquid outlet valves (12). The second exhaust pipeline (19-2) has a second vacuum generator (26-2), a second compressed gas pressure reducing valve (25-2) connected with the air inlet of the second vacuum generator (26-2), and a second exhaust switch valve (27-2) connected with the air 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). Each of the liquid inlet pipes (5) is connected to a liquid inlet pipe line (16), each of the liquid outlet pipes (6) is connected to a liquid outlet pipe line (17), each of the first gas inlet ports (7-1) is connected to a first gas inlet pipe line (18-1), each of the first gas outlet ports (8-1) is connected to a first gas outlet pipe line (19-1), each of the second gas inlet ports (7-2) is connected to a second gas inlet pipe line (18-2), and each of the second gas outlet ports (8-2) is connected to a second gas outlet pipe line (19-2).

8. The chemical delivery system of claim 7, wherein: The liquid inlet pipe line (16) has a liquid inlet pressure reducing valve (20) and a plurality of liquid inlet on-off valves (21) connected in parallel with the liquid inlet pressure reducing valve (20), and each of the liquid inlet on-off valves (21) is connected to each of the liquid inlet pipes (5); The liquid outlet pipe line (17) has a liquid outlet on-off valve (22) connected in parallel with each of the liquid outlet pipes (6); The first gas inlet pipe line (18-1) has a first gas inlet pressure reducing valve (23-1) and a plurality of first gas inlet on-off valves (24-1) connected in parallel with the first gas inlet pressure reducing valve (23-1), and each of the first gas inlet on-off valves (24-1) is connected to each of the first gas inlet ports (7-1); The second gas inlet pipe line (18-2) has a second gas inlet pressure reducing valve (23-2) and a plurality of second gas inlet on-off valves (24-2) connected in parallel with the second gas inlet pressure reducing valve (23-2), and each of the second gas inlet on-off valves (24-2) is connected to each of the second gas inlet ports (7-2); The first gas outlet pipe line (19-1) has a first vacuum generator (26-1), a first compressed gas pressure reducing valve (25-1) connected to an inlet port of the first vacuum generator (26-1), and a plurality of first gas outlet on-off valves (27-1) connected in parallel with a suction port of the first vacuum generator (26-1), and each of the first gas outlet on-off valves (27-1) is connected to each of the first gas outlet ports (8-1); The second gas outlet pipe line (19-2) has a second vacuum generator (26-2), a second compressed gas pressure reducing valve (25-2) connected to an inlet port of the second vacuum generator (26-2), and a plurality of second gas outlet on-off valves (27-2) connected in parallel with a suction port of the second vacuum generator (26-2), and each of the second gas outlet on-off valves (27-2) is connected to each of the second gas outlet ports (8-2).

9. The chemical delivery system of claim 8, wherein: A pressure gauge (28) is installed at a position behind the liquid inlet pressure reducing valve (20) in the liquid inlet pipe (16), a position behind the first gas inlet pressure reducing valve (23-1) in the first gas inlet pipe (18-1), a position behind the second gas inlet pressure reducing valve (23-2) in the second gas inlet pipe (18-2), a position behind the first compressed gas pressure reducing valve (25-1) in the first gas outlet pipe (19-1), and a position behind the second compressed gas pressure reducing valve (25-2) in the second gas outlet pipe (19-2), respectively. A flow meter (29) is installed at a position behind the liquid outlet on-off valve (22) in the liquid outlet pipe (6).

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