Chemical conveying system

Abstract

The chemical conveying system comprises a liquid inlet pipeline, a liquid discharging pipeline, a first gas inlet pipeline, a first gas discharging pipeline, a second gas inlet pipeline, a second gas discharging pipeline and a chemical conveying pump, the chemical conveying pump comprises a cavity and a sealing cover covering the opening portion of the cavity, and two independent cavities are formed in the cavity; the cavity is divided into an air cavity and a liquid cavity, the air cavity is communicated with the liquid cavity at the top, a liquid inlet pipe, a liquid discharge pipe and two air pipes are arranged on the sealing cover, the lower ends of the air pipes are respectively communicated with the two air cavities, the upper ends of the air pipes are respectively 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, and the liquid discharge pipe is provided with two branch liquid discharge pipes which are respectively inserted into the two liquid cavities. According to the chemical conveying system, the adopted pump equipment does not contain easily-damaged movable parts, the service life is long, the system has the advantage of stably conveying chemicals, and the water hammer phenomenon can be avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid transportation, and in particular relates to a chemical transportation system. Background Art

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

[0003] Service life is an important indicator of chemical delivery pumps. Existing chemical delivery pumps are generally bellows pumps and diaphragm pumps. The diaphragm and bellows inside are the key moving parts inside the pump and are also the vulnerable parts inside the pump. Since the diaphragm and bellows inevitably have the problem of easy wear and tear and short service life, the service life of the chemical delivery pump is also limited.

[0004] In addition, the flow type of the existing chemical delivery pumps when delivering chemicals is generally pulsating, and the delivery is not smooth, which will cause uneven flow speed of the chemicals in the pipeline, thereby affecting the overall delivery efficiency.

[0005] Moreover, in the case of large flow rate transportation, unstable transportation will also cause water hammer phenomenon, which will damage the transportation pipeline and cause chemical leakage, posing a major safety hazard. Summary of the invention

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

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A chemical delivery system includes a liquid inlet pipeline, a liquid discharge pipeline, a first air inlet pipeline, a first air exhaust pipeline, a second air inlet pipeline, a second air exhaust pipeline and a chemical delivery pump;

[0009] The chemical delivery pump comprises a cavity and a sealing cover covering the cavity mouth. The cavity has two cavities isolated from each other, and the cavity is further divided into an air cavity and a liquid cavity. The air cavity and the liquid cavity have a communicating exchange port at the top. The sealing cover is provided with an inlet pipe, a discharge pipe 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 divided into a first air inlet and a first exhaust port, and the upper end of the other air pipe is divided into a second air inlet and a second exhaust port. The inlet pipe is divided into two branch inlet pipes respectively inserted into the bottoms of the two liquid cavities, and the discharge pipe is divided into two branch discharge pipes respectively inserted into the bottoms of the two liquid cavities. The lower ends of the two branch inlet pipes are both provided with a one-way inlet valve, and the lower ends of the two branch discharge pipes are both provided with a one-way discharge valve.

[0010] The liquid inlet pipe is connected to the liquid inlet pipeline, the liquid discharge pipe is connected to the liquid discharge pipeline, the first air inlet port is connected to the first air inlet pipeline, the first exhaust port is connected to the first exhaust pipeline, the second air inlet port is connected to the second air inlet pipeline, and the second exhaust port is connected to the second exhaust pipeline.

[0011] In the above-mentioned chemical delivery system, the chemical delivery pump used has only a liquid inlet pipe, a liquid discharge pipe and two air pipes in its cavity. The air cavity and the liquid cavity are only connected at the exchange port at the top. Therefore, the air pressure in the liquid cavity can be controlled by the air pipe to provide power for the liquid, thereby controlling the inlet and outlet of the chemical in the liquid cavity to achieve the effect of delivering the chemical. In this way, the equipment does not contain vulnerable moving parts, so the service life of the equipment is long. Because there are two cavities in the cavity and they are isolated from each other, only two branch liquid inlet pipes and two branch liquid discharge pipes intersect, which does not affect the function of the two cavities to inhale and discharge chemicals. Therefore, the two cavities can work independently, but by controlling the two groups of cavities to work alternately, the low-pulsation chemical output function can be achieved, and the chemical output can be smoothly achieved.

[0012] The liquid inlet pipeline comprises a liquid inlet pressure reducing valve and a liquid inlet switch valve connected to the liquid inlet pressure reducing valve, the liquid inlet switch valve is further connected to the liquid inlet pipe, the liquid discharge pipeline comprises a liquid discharge switch valve connected to the liquid discharge pipe, the first air inlet pipeline comprises a first air inlet pressure reducing valve and a first air inlet switch valve connected to the first air inlet pressure reducing valve, the first air inlet switch valve is connected to the first air inlet port, the second air inlet pipeline comprises a second air inlet pressure reducing valve and a second air inlet switch valve connected to the second air inlet pressure reducing valve, the second air inlet switch valve is connected to the second air inlet port, the first exhaust pipeline comprises a first vacuum generator, a first compressed gas pressure reducing valve connected to the air inlet of the first vacuum generator, a first exhaust switch valve connected to the air intake port of the first vacuum generator, the first exhaust switch valve is connected to the first exhaust port, the second exhaust pipeline comprises a second vacuum generator, a second compressed gas pressure reducing valve connected to the air inlet of the second vacuum generator, a second exhaust switch valve connected to the air intake port of the second vacuum generator, and the second exhaust switch valve is connected to the second exhaust port.

[0013] Since each pipeline is equipped with a switch valve, the inlet and outlet of the material can be controlled by controlling the switch of each pipeline separately, thereby realizing the control of the chemical delivery pump.

[0014] Since the first exhaust pipeline and the second exhaust pipeline are both provided with vacuum generators, the first exhaust pipeline or the second exhaust pipeline can be used to alternately absorb the gas in the two cavities through the vacuum generator, and negative pressure is alternately formed in the two liquid cavities, so that the two liquid cavities alternately absorb chemicals. Then, nitrogen is alternately introduced into the two cavities through the first air inlet or the second air inlet, and positive pressure is alternately formed in the two liquid cavities to compress the liquid in the liquid cavities, so that the two liquid cavities alternately discharge chemicals. In this way, one cavity can discharge liquid while the other cavity absorbs liquid, and the pump can continuously and smoothly pump chemicals. In the chemical delivery pump, the liquid cavity is equipped 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 chemical liquid level in the current liquid cavity can be known through different liquid level sensors, so as to more accurately control the timing of chemical inhalation or discharge and improve the working efficiency of the chemical delivery pump. The safety liquid level sensor can also be used to make the height of the chemical liquid level lower than the exchange port to prevent chemicals from flowing into the air cavity and protect the equipment.

[0015] In chemical delivery pumps, the cavity, cover, inlet pipe, outlet pipe, air pipe, one-way inlet valve, and one-way outlet valve are all made of PFA or PTFE. Since PFA and PTFE materials have excellent chemical stability, corrosion resistance, and high thermal stability, they can protect these parts from being corroded by chemicals, further extend the service life of chemical delivery pumps, and prevent chemicals from being contaminated.

[0016] In the chemical delivery pump, the gas introduced into the first air inlet and the second air inlet is nitrogen. Since nitrogen is an inert gas, it has excellent chemical stability and is not easy to react with chemicals, so it can protect the chemicals from being contaminated.

[0017] In the system, a pressure gauge is installed in the liquid inlet pipeline behind the liquid inlet pressure reducing valve, in the first air inlet pipeline behind the first air inlet pressure reducing valve, in the second air inlet pipeline behind the second air inlet pressure reducing valve, in the first exhaust pipeline behind the first compressed gas pressure reducing valve, and in the second exhaust pipeline behind the second compressed gas pressure reducing valve, and a flow meter is installed in the discharge pipeline behind the discharge switch valve. The pressure state of the current pipeline can be known by observing the reading of the pressure gauge, and then the pressure of each pipeline can be adjusted by the pressure reducing valve according to the flow requirements of different pipelines, so as to further make the transportation stable.

[0018] In order to increase the pumping flow rate, the present invention also provides another chemical delivery system, including a liquid inlet pipeline, a liquid discharge pipeline, a first air inlet pipeline, a first exhaust pipeline, a second air inlet pipeline, a second exhaust pipeline and a plurality of chemical delivery pumps;

[0019] The chemical delivery pump comprises a cavity and a sealing cover covering the cavity mouth. The cavity has two cavities isolated from each other, and the cavity is further divided into an air cavity and a liquid cavity. The air cavity and the liquid cavity have a communicating exchange port at the top. The sealing cover is provided with an inlet pipe, a discharge pipe 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 divided into a first air inlet and a first exhaust port, and the upper end of the other air pipe is divided into a second air inlet and a second exhaust port. The inlet pipe is divided into two branch inlet pipes respectively inserted into the bottoms of the two liquid cavities, and the discharge pipe is divided into two branch discharge pipes respectively inserted into the bottoms of the two liquid cavities. The lower ends of the two branch inlet pipes are both provided with a one-way inlet valve, and the lower ends of the two branch discharge pipes are both provided with a one-way discharge valve.

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

[0021] By adopting the above technical solution, since each nozzle of each chemical delivery pump is connected to a pipeline, substances can be provided or absorbed to multiple chemical delivery pumps through each pipeline at the same time, so that more chemical delivery pumps can be added to the transportation at the same time, thereby increasing the delivery flow of the delivery pumps.

[0022] In the system, a pressure gauge is installed respectively at a position behind the liquid inlet pressure reducing valve in the liquid inlet pipeline, a position behind the first air inlet pressure reducing valve in the first air inlet pipeline, a position behind the second air inlet pressure reducing valve in the second air 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, and a flow meter is installed in the liquid discharge pipeline at a position behind the liquid discharge switch valve.

[0023] By adopting the above technical solution, the chemical delivery system of the present invention uses a pump device which has no vulnerable moving parts inside and has a long service life. The system has the advantage of smoothly delivering chemicals and can avoid the occurrence of water hammer phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0025] Figure 1 It is a structural schematic diagram of the chemical delivery pump of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the chemical delivery pump of the present invention without the cavity;

[0027] Figure 3 It is a cross-sectional view of the interior of the cavity of the chemical delivery pump of the present invention;

[0028] Figure 4 A top view of the chemical delivery pump of the present invention;

[0029] Figure 5 is a piping diagram of the chemical delivery system of Example 1;

[0030] Figure 6 This is a piping diagram of the chemical delivery system of Example 2.

[0031] 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 air pipeline; 19-2, second exhaust pipeline; 20, liquid inlet pressure reducing valve; 21, liquid inlet switch valve; 22, 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, flow meter. DETAILED DESCRIPTION

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

[0033] Example 1

[0034] like Figure 5 As shown, the chemical delivery system of this embodiment includes a liquid inlet pipeline 16, a liquid discharge pipeline, a first air intake pipeline 18-1, a first exhaust pipeline 19-1, a second air intake pipeline 18-2, a second exhaust pipeline 19-2 and a chemical delivery pump.

[0035] Depend on Figures 1 to 4As shown, the chemical delivery pump includes a cavity and a cover 1 covering the mouth of the cavity, and the cavity has two cavities (i.e., a first cavity and a second cavity) isolated from each other. The two cavities are divided into an air cavity 2 and a liquid cavity 3. The air cavity 2 and the liquid cavity 3 have a communicating exchange port 4 at the top. The cover 1 is provided with an inlet pipe 5, a drain pipe 6, and two air pipes. The lower ends of the two air pipes are respectively connected to the two air cavities 2, and the upper end of one of the air pipes is divided into a first air inlet port 7-1 and a first exhaust port 8-1, and the upper end of the other air pipe is divided into a second air inlet port 7-2 and a second exhaust port 8-2. The inlet pipe 5 is divided into two branch inlet pipes 9 respectively inserted into the bottom of the two liquid cavities 3. The drain pipe 6 is divided into two branch drain pipes 10 respectively inserted into the bottom of the two liquid cavities 3. The lower ends of the two branch inlet pipes 9 are provided with a one-way inlet valve 11. The lower ends of the two branch drain pipes 10 are both provided with one-way drain valves 12. The one-way inlet valve 11 can only allow liquid to flow from the branch inlet pipe into the liquid cavity, but not allow the liquid in the liquid cavity to flow out from the branch inlet pipe; the one-way drain valve 12 can only allow the liquid in the liquid cavity to flow out from the branch drain pipe 10, but not allow the liquid to flow from the branch drain pipe into the liquid cavity.

[0036] When the air inlet of one of the air pipes is closed and the exhaust port is opened, the exhaust port continuously absorbs the gas in the corresponding cavity, because at this time a negative pressure environment will be formed in the liquid cavity 3 of the cavity, and then chemicals can be sucked in through the branch liquid inlet pipe 9 corresponding to the liquid cavity 3. Since the end of the branch liquid discharge pipe 10 corresponding to the liquid cavity is equipped with a one-way liquid discharge valve 12, chemicals cannot be sucked in naturally. When the liquid sucked into the liquid cavity reaches a certain amount, the air inlet of the air pipe can be switched to open and the exhaust port can be closed. By passing compressed nitrogen into the air inlet, the air pressure in the corresponding cavity can be increased. The increased air pressure in the corresponding liquid cavity will compress the liquid sucked into the liquid cavity to discharge the liquid cavity through the branch liquid discharge pipe of the liquid cavity. Since the end of the branch liquid inlet pipe 9 corresponding to the liquid cavity is equipped with a one-way liquid inlet valve 12, naturally no liquid will be discharged from the branch liquid inlet pipe 9, thereby realizing the function of transporting chemicals.

[0037] Since two cavities are used in this embodiment, the two air pipes can be alternately sucked and inflated, so that the two liquid chambers can be alternately sucked and discharged, that is, one liquid chamber sucks while the other liquid chamber discharges. When the two cavities suck and discharge alternately, the chemicals can be discharged alternately, and the gap for chemical discharge is reduced (or even no gap) to reduce the conveying pulsation, achieve smooth chemical delivery, and avoid the occurrence of water hammer.

[0038] Since the chemical transfer pump has no moving parts that may be easily damaged, it has the advantage of a long service life.

[0039] All parts of the chemical delivery pump, including the cavity, cover, inlet pipe, outlet pipe, air pipe, one-way inlet valve, and one-way outlet valve, are made of PFA or PTFE. Since PFA and PTFE materials have excellent chemical stability, corrosion resistance, and high thermal stability, they can protect these parts from being corroded by chemicals, further extend the service life of the chemical delivery pump, and also prevent chemicals from being contaminated.

[0040] Depend on Figure 1 As shown, the liquid chamber 3 is equipped with a low liquid level sensor 13 , a high liquid level sensor 14 and a safety liquid level sensor 15 in sequence from bottom to top, and the height of the safety liquid level sensor 15 is lower than the exchange port 4 .

[0041] For example Figure 5 As shown, the liquid inlet pipe 5 of the chemical delivery pump is connected to the liquid inlet pipeline 16, the liquid discharge pipe 6 is connected to the liquid discharge pipeline, the first air inlet port 7-1 is connected to the first air inlet pipeline 18-1, the first exhaust port 8-1 is connected to the first exhaust pipeline 19-1, the second air inlet port 7-2 is connected to the second air inlet pipeline 18-2, and the second exhaust port 8-2 is connected to the second exhaust pipeline 19-2.

[0042] 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 port 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 port 7-2. The first exhaust pipeline 19-1 includes 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 air intake 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 includes 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 air intake of the second vacuum generator 26-2, and the second exhaust switch valve 27-2 is connected to the second exhaust port 8-2.

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

[0044] When working, the liquid inlet switch valve 21 on the liquid inlet pipeline 16 is opened, and the liquid discharge switch valve 22 on the liquid discharge pipeline is opened, and the high-speed compressed gas is continuously introduced into the air inlet of the first vacuum generator 26-1 and the second vacuum generator 26-2 and ejected from the exhaust port to keep in working state;

[0045] When the first air intake switch valve 18-1 on the first air intake pipeline 18-1 corresponding to the first cavity is opened, the second air intake switch valve 24-2 on the second air intake 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, the compressed nitrogen will enter the air cavity of the first cavity through the second air intake pipeline 18-1, so that the air pressure in the first cavity increases, and the increased air pressure will compress the chemicals in the liquid cavity of the first cavity, and discharge them out of the liquid cavity through the branch drain pipe in the liquid cavity, and then transport them out through the drain pipeline. At the same time, the second vacuum generator extracts the gas in the air cavity of the second cavity, so that the air pressure in the second cavity decreases, forming a negative pressure, so that the external chemicals are sucked into the liquid cavity of the second cavity through the liquid intake pipeline 16. This process enables the liquid cavity of the first cavity to discharge chemicals and the liquid cavity of the second cavity to inhale chemicals.

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

[0047] When the liquid cavity of the first cavity absorbs a certain amount of chemicals, the liquid cavity of the first cavity is switched to discharge chemicals and the liquid cavity of the second cavity absorbs chemicals, and the alternating cycle is repeated, thereby achieving continuous and smooth chemical delivery.

[0048] The timing of the chemical inhalation and discharge in the liquid cavity is controlled by the low liquid level sensor 13 and the high liquid level sensor 14 on the liquid cavity. When the liquid level in the liquid cavity is at the position of the low liquid level sensor 13, the liquid cavity starts to inhale 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 plays a role in liquid level warning. Once the liquid level in the liquid cavity reaches the position of the safety liquid level sensor 15, the system stops working and issues an alarm.

[0049] In order to realize the automatic operation of the system, the liquid inlet switch valve 21, the liquid discharge switch valve 22, the first air inlet switch valve 24-1, the second air 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 all 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 levels in the two liquid chambers sensed by each liquid level sensor, so as to realize the automatic operation of the system.

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

[0051] In addition, a pressure gauge 28 is installed in the liquid inlet pipeline 16 at a rear position of the liquid inlet pressure reducing valve 20, in the first air inlet pipeline 18-1 at a rear position of the first air inlet pressure reducing valve 23-1, in the second air inlet pipeline 18-2 at a rear position of the second air inlet pressure reducing valve 23-2, in the first exhaust pipeline 19-1 at a rear position of the first compressed gas pressure reducing valve 25-1, and in the second exhaust pipeline 19-2 at a rear position of the second compressed gas pressure reducing valve 25-2, and a flow meter 29 is installed in the discharge pipeline 17 at a rear position of the discharge switch valve 22.

[0052] By observing the indication of the pressure gauge 28, the current pressure state of the pipeline can be known, and then the pressure of each pipeline can be adjusted through the pressure reducing valve according to the flow requirements of different pipelines. The current flow rate of chemical delivery can also be known by observing the indication of the flow meter 29, and whether the chemical delivery is stable can be observed.

[0053] In this embodiment, the first vacuum generator 26-1 and the second vacuum generator 26-2 are both jet vacuum generators, which use the Bernoulli principle to pass compressed gas into the air inlet of the vacuum generator (in this embodiment, the port connected to the compressed gas pressure reducing valve), and then discharge it from the exhaust port after flowing at a high speed inside. The high-speed internal gas flow will cause the air intake port (i.e., the port connected to the exhaust switch 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 may also be other types of vacuum generators, or a vacuum pump may be directly used to evacuate the air cavity.

[0055] Example 2

[0056] The chemical delivery pump of the present invention may include several chemical delivery pumps used in Embodiment 1.

[0057] This embodiment takes two chemical delivery pumps as an example. Figure 6 As shown, the chemical delivery system of this embodiment includes two chemical delivery pumps in Embodiment 1, each liquid inlet pipe 5 is connected to the liquid inlet pipeline 16, each liquid discharge pipe 6 is connected to the liquid discharge pipeline 17, each first air inlet port 7-1 is connected to the first air inlet pipeline 18-1, each first exhaust port 8-1 is connected to the first exhaust pipeline 19-1, each second air inlet port 7-2 is connected to the second air inlet pipeline 18-2, and each second exhaust port 8-2 is connected to the second exhaust pipeline 19-2.

[0058] Since each pipe opening of each chemical delivery pump is connected to a pipeline, materials can be provided or absorbed to multiple chemical delivery pumps through each pipeline at the same time, so that more chemical delivery pumps can be involved in transportation at the same time, thereby improving pumping flow and pumping efficiency.

[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 discharge pipeline 17 has a liquid discharge switch valve 22 connected in parallel with the liquid discharge pipes 6 of the two chemical delivery pumps. The first air inlet pipeline 18-1 has a first air inlet pressure reducing valve 23-1 and two first air inlet switch valves 24-1 connected in parallel with the first air inlet pressure reducing valve 23-1, and each first air inlet switch valve 24-1 is respectively connected to the first air inlet port 7-1 of each chemical delivery pump. The second air inlet pipeline 18-2 has a second air inlet pressure reducing valve 23-2 and two second air inlet switch valves 24-2 connected in parallel with the second air inlet pressure reducing valve 23-2, and each second air inlet switch valve 24-2 is respectively connected to the second air inlet port 7-2 of each chemical delivery pump. The first exhaust pipeline 19-1 has 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 two first exhaust switch valves 27-1 connected in parallel to the air intake of the first vacuum generator 26-1, and each first exhaust switch valve 27-1 is respectively connected to the first exhaust port 8-1 of each chemical delivery pump. The second exhaust pipeline 19-2 has a second vacuum generator 26-2, a second compressed gas pressure reducing valve 25-2 connected to the air inlet of the second vacuum generator 26-2, and two second exhaust switch valves 27-2 connected in parallel to the air intake of the second vacuum generator 26-2, and each second exhaust switch valve 27-2 is respectively connected to the second exhaust port 8-2 of each chemical delivery pump.

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

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

Claims

1. A chemical delivery system, characterized in that: It comprises a liquid inlet pipeline (16), a liquid discharge pipeline (17), a first air inlet pipeline (18-1), a first air exhaust pipeline (19-1), a second air inlet pipeline (18-2), a second air exhaust pipeline (19-2) and a chemical delivery pump; The chemical delivery pump comprises a cavity and a sealing cover (1) covering the mouth of the cavity, wherein the cavity has two mutually isolated cavities, and the cavity is further divided into an air cavity (2) and a liquid cavity (3); the air cavity (2) and the liquid cavity (3) have a communicating exchange port (4) at the top; the sealing cover (1) is provided with a liquid inlet pipe (5), a liquid discharge pipe (6), and two air pipes; the lower ends of the two air pipes are respectively connected to the two air cavities (2), and the upper end of one of the air pipes is divided into a first air inlet port (7-1) and a second air discharge port (7-2). an exhaust port (8-1), and the upper end of the other air pipe is divided into a second air inlet port (7-2) and a second exhaust port (8-2); the liquid inlet pipe (5) is divided into two branch liquid inlet pipes (9) respectively inserted into the bottoms of the two liquid chambers (3); the liquid discharge pipe (6) is divided into two branch liquid discharge pipes (10) respectively inserted into the bottoms of the two liquid chambers (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 discharge pipes (10) are each provided with a one-way liquid discharge valve (12); The liquid inlet pipe (5) is connected to a liquid inlet pipeline (16), the liquid discharge pipe (6) is connected to a liquid discharge pipeline (17), the first air inlet port (7-1) is connected to a first air inlet pipeline (18-1), the first air exhaust port (8-1) is connected to a first air exhaust pipeline (19-1), the second air inlet port (7-2) is connected to a second air inlet pipeline (18-2), and the second air exhaust port (8-2) is connected to a second air exhaust pipeline (19-2).

2. The chemical delivery system according to claim 1, characterized in that: The liquid inlet pipeline (16) comprises 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 (17) is provided with a liquid discharge switch valve (22) connected to the liquid discharge pipe (6); The first air intake pipeline (18-1) comprises a first air intake pressure reducing valve (23-1) and a first air intake switching valve (24-1) connected to the first air intake pressure reducing valve (23-1), and the first air intake switching valve (24-1) is connected to the first air intake port (7-1); The second air intake pipeline (18-2) comprises a second air intake pressure reducing valve (23-2) and a second air intake switching valve (24-2) connected to the second air intake pressure reducing valve (23-2), and the second air intake switching valve (24-2) is connected to the second air intake port (7-2); The first exhaust pipeline (19-1) comprises 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 air intake of the first vacuum generator (26-1), wherein the first exhaust switch valve (27-1) is connected to the first exhaust port (8-1); The second exhaust pipeline (19-2) comprises a second vacuum generator (26-2), a second compressed gas pressure reducing valve (25-2) connected to the air inlet of the second vacuum generator (26-2), and a second exhaust switch valve (27-2) connected to the air intake of the second vacuum generator (26-2); the second exhaust switch valve (27-2) is connected to the second exhaust port (8-2).

3. The chemical delivery system according to claim 2, characterized in that: A pressure gauge (28) is installed in each of the liquid inlet pipeline (16) at a position behind the liquid inlet pressure reducing valve (20), the first air inlet pipeline (18-1) at a position behind the first air inlet pressure reducing valve (23-1), the second air inlet pipeline (18-2) at a position behind the second air inlet pressure reducing valve (23-2), the first exhaust pipeline (19-1) at a position behind the first compressed gas pressure reducing valve (25-1), and the second exhaust pipeline (19-2) at a position behind the second compressed gas pressure reducing valve (25-2), and a flow meter (29) is installed in the liquid discharge pipeline (17) at a position behind the liquid discharge switch valve (22).

4. The chemical delivery system according to claim 1, characterized in that: The liquid chamber (3) is provided with a low liquid level sensor (13), a high liquid level sensor (14) and a safety liquid level sensor (15) in order from bottom to top; the height of the safety liquid level sensor (15) is lower than the exchange port (4).

5. The chemical delivery system according to claim 1, characterized in that: The cavity, the sealing cover (1), the liquid inlet pipe (5), the liquid discharge pipe (6), the air pipe, the one-way liquid inlet valve (11), and the one-way liquid discharge valve (12) are all made of PFA or PTFE.

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

7. A chemical delivery system, characterized in that: It comprises a liquid inlet pipeline (16), a liquid discharge pipeline (17), a first air inlet pipeline (18-1), a first air exhaust pipeline (19-1), a second air inlet pipeline (18-2), a second air exhaust pipeline (19-2), and a plurality of chemical delivery pumps; The chemical delivery pump comprises a cavity and a sealing cover (1) covering the mouth of the cavity, wherein the cavity has two mutually isolated cavities, and the cavity is further divided into an air cavity (2) and a liquid cavity (3); the air cavity (2) and the liquid cavity (3) have a communicating exchange port (4) at the top; the sealing cover (1) is provided with a liquid inlet pipe (5), a liquid discharge pipe (6), and two air pipes; the lower ends of the two air pipes are respectively connected to the two air cavities (2), and the upper end of one of the air pipes is divided into a first air inlet port (7-1) and a second air discharge port (7-2). an exhaust port (8-1), and the upper end of the other air pipe is divided into a second air inlet port (7-2) and a second exhaust port (8-2); the liquid inlet pipe (5) is divided into two branch liquid inlet pipes (9) respectively inserted into the bottoms of the two liquid chambers (3); the liquid discharge pipe (6) is divided into two branch liquid discharge pipes (10) respectively inserted into the bottoms of the two liquid chambers (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 discharge pipes (10) are each provided with a one-way liquid discharge valve (12); Each of the liquid inlet pipes (5) is connected to a liquid inlet pipeline (16), each of the liquid discharge pipes (6) is connected to a liquid discharge pipeline (17), each of the first air inlet ports (7-1) is connected to a first air inlet pipeline (18-1), each of the first air exhaust ports (8-1) is connected to a first air exhaust pipeline (19-1), each of the second air inlet ports (7-2) is connected to a second air inlet pipeline (18-2), and each of the second air exhaust ports (8-2) is connected to a second air exhaust pipeline (19-2).

8. The chemical delivery system according to claim 7, characterized in that: The liquid inlet pipeline (16) comprises a liquid inlet pressure reducing valve (20) and a plurality of liquid inlet switch valves (21) connected in parallel with the liquid inlet pressure reducing valve (20), and each of the liquid inlet switch valves (21) is respectively connected to each of the liquid inlet pipes (5); The liquid discharge pipeline (17) is provided with a liquid discharge switch valve (22) connected in parallel to each of the liquid discharge pipes (6); The first air intake pipeline (18-1) comprises a first air intake pressure reducing valve (23-1) and a plurality of first air intake switch valves (24-1) connected in parallel with the first air intake pressure reducing valve (23-1), and each of the first air intake switch valves (24-1) is respectively connected to each of the first air intake ports (7-1); The second air intake pipeline (18-2) comprises a second air intake pressure reducing valve (23-2) and a plurality of second air intake switch valves (24-2) connected in parallel with the second air intake pressure reducing valve (23-2), and each of the second air intake switch valves (24-2) is respectively connected to each of the second air intake ports (7-2); The first exhaust pipeline (19-1) comprises 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 plurality of first exhaust switch valves (27-1) connected in parallel to the air intake of the first vacuum generator (26-1), and each of the first exhaust switch valves (27-1) is respectively connected to each of the first exhaust ports (8-1); The second exhaust pipeline (19-2) comprises a second vacuum generator (26-2), a second compressed gas pressure reducing valve (25-2) connected to the air inlet of the second vacuum generator (26-2), and a plurality of second exhaust switch valves (27-2) connected in parallel to the air intake of the second vacuum generator (26-2), and each of the second exhaust switch valves (27-2) is respectively connected to each of the second exhaust ports (8-2).

9. The chemical delivery system according to claim 8, characterized in that: A pressure gauge (28) is installed in each of the liquid inlet pipeline (16) at a position behind the liquid inlet pressure reducing valve (20), the first air inlet pipeline (18-1) at a position behind the first air inlet pressure reducing valve (23-1), the second air inlet pipeline (18-2) at a position behind the second air inlet pressure reducing valve (23-2), the first exhaust pipeline (19-1) at a position behind the first compressed gas pressure reducing valve (25-1), and the second exhaust pipeline (19-2) at a position behind the second compressed gas pressure reducing valve (25-2), and a flow meter (29) is installed in the liquid discharge pipeline (6) at a position behind the liquid discharge switch valve (22).

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