Fluid delivery system and control method thereof

Abstract

The present invention relates to the field of food production technology, and specifically to a fluid delivery system and a control method thereof, wherein the fluid delivery system comprises: a fluid delivery target, including a material cylinder and a fluid output unit, the material cylinder is connected to a first air intake control unit and a feed valve, the first air intake control unit is suitable for controlling the introduction of sterile air into the material cylinder, and the fluid output unit is connected to a cleaning return line; a fluid delivery source, provided with a feed valve, the feed valve and the feed valve are connected through a feed pipe; the feed pipe is provided with a highest point, the height of the highest point is higher than the height of the feed valve, the feed pipe is connected to a drainage branch near the feed valve and the cleaning return line, and a material top air discharge valve is provided on the drainage branch. The water in the feed pipe can be discharged first, thereby avoiding the destruction of the active ingredients in the feed liquid by sterile hot water, and at the same time avoiding the contamination of dripping material and waste of the feed liquid due to the thinning of the feed liquid, thereby avoiding the influence of dripping material on the performance of the fluid delivery target and the product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of food production, and in particular to a fluid delivery system and a control method thereof. Background Art

[0002] The production, filling and storage of dairy products such as yogurt require strict production conditions due to their special process flow. The important preparation before filling the liquid is to disinfect the pipes, pumps and filling machines through which the liquid is about to flow. The commonly used disinfection method is to use sterile water above 90°C to flow through the entire filling system for disinfection. Therefore, before the filling machine is fed, the pipe is filled with sterile water at 90°C. Under this condition, the pipe material is directly topped with water. The heat of the pipe and hot water will dilute the state of the material. During filling, the filling head drips and causes pollution, and the material-water mixture increases and the cost of discharging is high. In order to control pollution, the filling machine needs to wait for 2-3 hours after cleaning for the pipes and equipment to cool naturally, which greatly loses efficiency and production capacity. If the machine is turned on directly without waiting for natural cooling, it will be necessary to discharge about 300 kg of thinner liquid.

[0003] In order to reduce costs and increase efficiency while avoiding quality pollution, the "pipeline pig" approach has been considered: However, due to the following defects, this approach has not been maturely applied and effectively promoted in the industry.

[0004] First, due to the influence of pipeline bends, weld smoothness, and pipeline pig sealing performance, the effect of isolating the material-water mixture to reduce material loss is poor; second, many hardware facilities corresponding to the pipeline pig retention station must be added at both ends of the feed pipeline, including the pipeline pig wearing parts themselves, which have high maintenance costs and energy consumption, and also increase operation and capital investment. Finally, this technology does not avoid the destruction of active ingredients in the liquid material by the high-temperature sterile hot water in the pipeline during the top-loading process; nor does it avoid the impact of the dripping of the filling head on the performance of the filling machine and product quality after the high-temperature hot water changes the organizational state of the low-temperature liquid material. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art that the filling system top material process may cause dripping pollution, material waste and low efficiency, thereby providing a fluid conveying system and a control method thereof.

[0006] In order to solve the above technical problems, the present invention provides a fluid delivery system, comprising:

[0007] A fluid delivery target includes a material cylinder and a fluid output unit, wherein the material cylinder is connected to a first air intake control unit and a feed valve, wherein the first air intake control unit is suitable for controlling the introduction of sterile air into the material cylinder, and the fluid output unit is connected to a cleaning return pipeline;

[0008] The fluid delivery source is provided with a feed valve, and the feed valve is connected to the feed valve via a feed pipeline;

[0009] The feed pipeline is provided with a highest point, the height of the highest point is higher than the height of the feed valve, a drainage branch is connected between the feed pipeline near the feed valve and the cleaning return pipeline, and a material top air discharge valve is provided on the drainage branch.

[0010] Optionally, the feed pipeline includes a first branch section connected to the fluid delivery source, a climbing section connected to the first branch section, and a second branch section connected to the climbing section and the feed valve, the top of the climbing section is the highest point of the feed pipeline, the first branch section is provided with a pipeline lowest point drain valve, the first branch section is provided with a feed pump, the feed pump is provided with a bypass branch in parallel, and the bypass branch is provided with a bypass valve.

[0011] Optionally, a pressure sensor is provided on the first branch section, and the pressure sensor is arranged on a side of the drain valve at the lowest point of the pipeline away from the climbing section.

[0012] Optionally, the fluid delivery source is connected to a second air intake control unit, and the second air intake control unit is suitable for controlling the fluid delivery source to allow sterile air to enter.

[0013] Optionally, a tank bottom valve is provided at the bottom of the fluid delivery source, and / or a tank pressure sensor is provided in the fluid delivery source.

[0014] Optionally, the slope of the climbing section is greater than or equal to 50%.

[0015] Optionally, the second branch segment is arranged obliquely.

[0016] Optionally, the slope of the second branch section is 0.5%-50%.

[0017] The present invention also provides a control method using the fluid delivery system, comprising:

[0018] Drain the water from the highest point to the feed valve;

[0019] Controlling the first air intake control unit and the feed valve to open so that the feed pipeline is filled with sterile air;

[0020] The feed valve and the material top air exhaust valve are controlled to open, so that the material liquid in the fluid delivery source enters the feed pipeline, and the material liquid pushes the sterile air to be discharged through the material top air exhaust valve.

[0021] Optionally, the step of discharging water from the highest point to the feed valve comprises:

[0022] The first air intake control unit and the feed valve are controlled to open so that during the water discharge from the highest point to the feed valve, a positive pressure of sterile air is maintained in the feed pipeline.

[0023] Optionally, the step of discharging water from the highest point to the feed valve comprises:

[0024] Control the feed valve and the cleaning reflux pump to open and discharge the water from the highest point to the feed valve.

[0025] Optionally, the step of discharging water from the highest point to the feed valve further comprises:

[0026] Control the material top air exhaust valve to open.

[0027] Optionally, the step of controlling the first air intake control unit and the feed valve to open so that the feed pipe is filled with sterile air includes:

[0028] Control the first air intake control unit, the feed valve, and the drain valve at the lowest point of the pipeline to open, and control the drain valve at the top of the material to close, so that the water in the climbing section can be discharged, and sterile air can be used to cool the feed pipeline;

[0029] After the drain valve at the lowest point of the pipeline is opened for a first preset time, the feed valve and the drain valve at the lowest point of the pipeline are controlled to be closed.

[0030] Optionally, the step of controlling the first air intake control unit and the feed valve to open so that the feed pipe is filled with sterile air further includes:

[0031] Determining the pressure of the feed pipeline;

[0032] When the pressure of the feed pipeline is less than a first preset value, the drain valve at the lowest point of the pipeline is controlled to close;

[0033] When the pressure of the feed pipeline is greater than a second preset value, the drain valve at the lowest point of the pipeline is controlled to open.

[0034] Optionally, the step of controlling the feed valve and the material top air exhaust valve to open so that the material liquid in the fluid delivery source enters the feed pipe, and the material liquid pushes the sterile air to be discharged through the material top air exhaust valve comprises:

[0035] The tank bottom valve, feed valve, feed pump and material top air exhaust valve are controlled to be opened, so that the material liquid in the fluid delivery source enters the feed pipeline, and the material liquid pushes the sterile air to be discharged through the material top air exhaust valve.

[0036] Optionally, the control tank bottom valve, the feed valve, the feed pump, and the material top gas exhaust valve are opened to allow the liquid in the fluid delivery source to enter the feed pipeline, and the sterile air is driven by the liquid to be discharged through the material top gas exhaust valve, including:

[0037] The tank bottom valve, the feed valve, the bypass valve and the material top gas exhaust valve are controlled to be opened, and the bypass valve is controlled to be closed and the feed pump to be opened after the bypass valve is opened for a second preset time.

[0038] Optionally, before the step of controlling the tank bottom valve, the feed valve, the feed pump, and the material top gas exhaust valve to open so that the feed liquid in the fluid delivery source enters the feed pipe and the feed liquid pushes the sterile air to be discharged through the material top gas exhaust valve, the step further includes:

[0039] The second air intake control unit is controlled to open, and when the pressure value detected by the tank pressure sensor is greater than or equal to the third preset value, the step of controlling the feed valve and the material top air exhaust valve to open is executed, so that the material liquid in the fluid conveying source enters the feed pipeline, and the material liquid pushes the sterile air to be discharged through the material top air exhaust valve.

[0040] The technical solution of the present invention has the following advantages:

[0041] 1. The fluid conveying system provided by the present invention, by setting a first air intake control unit, the first air intake control unit can control the sterile air to enter the material cylinder, and can enter the supply pipe through the feed valve; the sterile water in the section of the supply pipe from the highest point to the feed valve can be discharged through the fluid output unit and the cleaning return pipe; a drainage branch is connected between the supply pipe near the feed valve and the cleaning return pipe, and a material top air discharge valve is provided on the drainage branch, on the one hand, the discharge of sterile water in the section of the pipe from the highest point to the feed valve can be accelerated, and on the other hand, after the water in the supply pipe is discharged, the material liquid in the fluid conveying source can enter the supply pipe, and the material liquid pushes the sterile air to be discharged through the material top air discharge valve. Therefore, the water in the feed pipe can be discharged first, so as to avoid the destruction of the active ingredients in the feed by sterile hot water, and at the same time avoid dripping contamination and waste of feed due to the thinning of the feed, and further avoid the dripping of the fluid output unit to affect the fluid delivery target performance and product quality. Since there is no need to wait for a long natural cooling time, the efficiency of the fluid delivery system can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a schematic diagram of a fluid delivery system provided in Example 1 of the present invention;

[0044] Figure 2 It is a schematic diagram of the control method of the fluid delivery system provided in Embodiment 3 of the present invention in the first step;

[0045] Figure 3 It is a schematic diagram of the control method of the fluid delivery system provided in Embodiment 3 of the present invention in the second step;

[0046] Figure 4 This is a schematic diagram of the third step of the control method for the fluid delivery system provided in Example 3 of the present invention.

[0047] Description of reference numerals:

[0048] 1-first air intake control unit; 2-feed valve; 3-top gas discharge valve; 4-highest point; 5-bypass valve; 6-feed pump; 7-lowest point discharge valve in the pipeline; 8-pressure sensor; 9-feed valve; 10-bottom valve of the tank; 11-fluid delivery source; 12-second air intake control unit; 13-cleaning reflux pump; 14-material cylinder; 15-fluid output unit; 16-cleaning reflux cylinder; 17-tank pressure sensor. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] Example 1

[0054] This embodiment provides a fluid delivery system. In one embodiment, Figure 1 As shown, the fluid delivery system includes a fluid delivery target and a fluid delivery source 11 .

[0055] Among them, the fluid delivery target includes a material cylinder 14 and a fluid output unit 15. The material cylinder 14 is connected to a first air intake control unit 1 and a feed valve 2. The first air intake control unit 1 is suitable for controlling the introduction of sterile air into the material cylinder. The fluid output unit 15 is connected to a cleaning return line. The fluid delivery source 11 is provided with a feed valve 9, and the feed valve 9 is connected to the feed valve 2 through a feed pipe. The feed pipe is provided with a highest point 4, and the height of the highest point 4 is higher than the height of the feed valve 2. A drainage branch is connected between the feed pipe near the feed valve 2 and the cleaning return line, and a material top air discharge valve 3 is provided on the drainage branch.

[0056] In this embodiment, by setting up a first air intake control unit 1, sterile air can enter the material cylinder 14 through the first air intake control unit 1, and can enter the supply pipe through the feed valve 2; the sterile water in the section from the highest point 4 of the supply pipe to the feed valve 2 can be discharged through the fluid output unit 15 and the cleaning return pipe; by connecting a drainage branch between the supply pipe near the feed valve 2 and the cleaning return pipe, and providing a material top air discharge valve 3 on the drainage branch, on the one hand, the discharge of sterile water in the section from the highest point 4 to the feed valve 2 can be accelerated, and on the other hand, after the water in the supply pipe is discharged, the material liquid in the fluid conveying source 11 can enter the supply pipe, and the material liquid pushes the sterile air to be discharged through the material top air discharge valve 3. Therefore, in this embodiment, the water in the feed pipe can be discharged first, so as to avoid the destruction of the active ingredients in the feed liquid by sterile hot water, and at the same time avoid dripping contamination and waste of the feed liquid due to the thinning of the feed liquid, thereby avoiding the dripping of the fluid output unit to affect the fluid delivery target performance and product quality. Since there is no need to wait for a long natural cooling time, the efficiency of the fluid delivery system can be ensured.

[0057] In one embodiment, the fluid delivery target is a filling machine, and the fluid delivery source is a supply tank. In other alternative embodiments, the fluid delivery target and the fluid delivery source may be other structures.

[0058] The first intake control unit may specifically be a first intake valve.

[0059] Specifically in one embodiment, a cleaning reflux cylinder 16 is provided on the cleaning reflux pipeline, and a drainage branch is provided between the feed pipeline and the cleaning reflux cylinder 16. The sterile water in the section from the highest point 4 of the feed pipeline to the feed valve 2 can flow into the cleaning reflux cylinder 16, and the sterile hot water can be recycled.

[0060] On the basis of the above-mentioned embodiments, in a preferred embodiment, the feed pipeline includes a first branch section connected to the fluid delivery source 11, a climbing section connected to the first branch section, and a second branch section connected to the climbing section and the feed valve 2. The top of the climbing section is the highest point 4 of the feed pipeline. The first branch section is provided with a pipeline lowest point drain valve 7. The first branch section is provided with a feed pump 6. The feed pump 6 is provided with a bypass branch in parallel. The bypass branch is provided with a bypass valve 5. In this embodiment, by providing a climbing pipeline, the second branch section can be arranged at a higher position, and the space at the high place can be fully utilized, thereby avoiding inconvenience to the staff caused by the pipeline being arranged at a low place. In this embodiment, after the fluid delivery target and the supply pipeline are cleaned and disinfected, the first air intake control unit 1 can be kept open, the fluid delivery target material cylinder 14 can be prepared with a pressure of 0.2-1 bar, the feed valve 2 and the material top air drain valve 3 can be opened, and the supply pipeline can be drained of water from the highest point 4 of the supply pipeline to the second branch section between the feed valve 2 under the sterile air preparation pressure of 0.2-1 bar; then the material top air drain valve 3 can be closed, the bypass valve 5 and the pipeline lowest point drain valve 7 can be opened to discharge the sterile hot water in the climbing pipeline and use sterile air to cool the supply pipeline; then the feed valve 2 and the pipeline lowest point drain valve 7 can be closed, and the supply valve 9 can be opened, and the material liquid in the fluid delivery source 11 enters the supply pipeline, and the material liquid pushes the sterile air to be discharged through the material top air drain valve 3.

[0061] In an alternative embodiment, the fluid delivery source 11 can be set at a higher position, the fluid delivery target can be set at a lower position, and an inclined supply pipeline is passed between the supply valve 9 and the feed valve 2, and the supply pipeline is inclined downward from the supply valve 9 to the feed valve 2. In this embodiment, after the fluid delivery target and the supply pipeline are cleaned and disinfected, the first air intake control unit 1 can be kept open, the fluid delivery target cylinder 14 is prepared with a pressure of 0.2-1 bar, the feed valve 2 and the material top air discharge valve 3 are opened, and the supply pipeline is allowed to drain the water from the highest point 4 of the supply pipeline to the feed valve 2 under the 0.2-1 bar sterile air preparation pressure, and the sterile hot water in the supply pipeline is completely discharged.

[0062] On the basis of the above-mentioned embodiment, in a preferred embodiment, a pressure sensor 8 is provided on the first branch section, and the pressure sensor 8 is provided on the side of the drain valve 7 at the lowest point of the pipeline away from the climbing section. In this embodiment, by providing the pressure sensor 8 on the first branch section, the pressure in the feed pipeline can be monitored in real time. Specifically, during operation, when the pressure sensor 8 detects that the pressure in the feed pipeline is less than 100 mbar, there is a risk of tank backflow from the outside air. At this time, the drain valve 7 at the lowest point of the pipeline needs to be closed. When the pressure sensor 8 detects that the pressure in the feed pipeline is greater than 500 mbar, the drain valve 7 at the lowest point of the pipeline is opened.

[0063] On the basis of the above embodiment, in a preferred embodiment, the fluid delivery source 11 is connected to a second air intake control unit 12, and the second air intake control unit 12 is suitable for controlling the introduction of sterile air into the fluid delivery source 11. In this embodiment, by introducing sterile air into the fluid delivery source 11, sufficient pressure can be provided in the fluid delivery source 11, so that the feed liquid in the fluid delivery source 11 can smoothly enter the feed pipe, and at the same time, the feed liquid in the fluid delivery source 11 can be protected from damage.

[0064] The second intake control unit 12 may specifically be a second intake valve.

[0065] Based on the above embodiment, in a preferred embodiment, a tank bottom valve 10 is provided at the bottom of the fluid delivery source 11. When material supply is required, the tank bottom valve 10 is opened to supply material. Usually, one tank bottom valve 10 can be connected to multiple supply valves 9 to supply material to multiple supply pipelines.

[0066] On the basis of the above embodiment, in a preferred embodiment, a tank pressure sensor 17 is provided in the fluid delivery source 11. By providing the tank pressure sensor 17, the pressure in the fluid delivery source 11 can be monitored in real time, and when the pressure value detected by the tank pressure sensor 17 is greater than 100 mbar, the tank bottom valve 10 and the feed valve 9 are opened to feed the feed pipeline.

[0067] Based on the above implementation, in a preferred implementation, the slope of the climbing section is greater than or equal to 50%. Figure 1 As shown, the climbing section is vertically arranged. In some other embodiments, the slope of the climbing section is 50%. In this embodiment, the slope of the climbing section is large, which is convenient for draining the water in the feed pipe. In other replaceable embodiments, the slope of the climbing section is less than 50%.

[0068] Based on the above embodiments, in a preferred embodiment, the second branch segment is arranged obliquely. In this embodiment, since the second branch segment is arranged obliquely, the water in the second branch segment can be automatically drained by utilizing the gravity of the water. In other alternative embodiments, the second branch segment may include a plurality of inclined segments and horizontal segments connected between the inclined segments.

[0069] Specifically, the slope of the second branch section is 0.5%-50%.

[0070] In a preferred embodiment, the slope of the second branch section is 2%. In other alternative embodiments, the slope of the second branch section may be greater than 2%.

[0071] Example 2

[0072] This embodiment provides a control method using a fluid delivery system, and the control method is used in the fluid delivery system provided in Example 1. In one embodiment, the control method includes the following steps:

[0073] S1: discharge the water from the highest point 4 to the feed valve 2;

[0074] S2: Control the first air intake control unit 1 and the feed valve 2 to open, so that the feed pipeline is filled with sterile air;

[0075] S3: Control the feed valve 9 and the material top air exhaust valve 3 to open, so that the material liquid in the fluid delivery source 11 enters the feed pipeline, and the material liquid pushes the sterile air to be discharged through the material top air exhaust valve 3.

[0076] In this embodiment, the water in the feed pipe is first discharged. During the process of filling the feed pipe with sterile air, the temperature of the feed pipe can be lowered, thereby avoiding the destruction of active ingredients in the feed liquid by sterile hot water or high-temperature pipes. At the same time, it can avoid dripping contamination and waste of feed liquid due to thinning of the feed liquid, and further avoid dripping of the fluid output unit to affect the target performance of fluid delivery and product quality. Since there is no need to wait for a long natural cooling time, the efficiency of the fluid delivery system can be ensured.

[0077] It should be noted that steps S1 and S2 can be performed simultaneously or sequentially.

[0078] Specifically in one embodiment, step S1 includes: controlling the first air intake control unit 1 and the feed valve 2 to open, so that during the water discharge process from the highest point 4 to the feed valve 2, the feed pipe maintains a sterile air positive pressure. In this embodiment, after the fluid delivery target and the feed pipe are cleaned and disinfected, the first air intake control unit 1 can be kept open, the fluid delivery target cylinder 14 is pressurized to 0.2-1 bar, and the feed valve 2 is opened, so that the feed pipe is under the sterile air pressure of 0.2-1 bar, and the water between the highest point 4 of the feed pipe and the feed valve 2 is completely discharged.

[0079] In a preferred embodiment, step S1 further includes: controlling the top gas discharge valve 3 to open. In this embodiment, step S1 specifically includes: controlling the first air intake control unit 1, the feed valve 2, and the top gas discharge valve 3 to open, and discharging the water from the highest point 4 to the feed valve 2. In this embodiment, the water between the highest point 4 of the feed pipeline and the feed valve 2 is discharged simultaneously through the feed valve 2-the material cylinder 14-the fluid output unit 15-the cleaning reflux cylinder 16, and the top gas discharge valve 3-the cleaning reflux cylinder 16, and the drainage efficiency is relatively high.

[0080] Specifically, the fluid delivery system may be provided with a second branch drainage button, and when the second branch drainage button is pressed, the control system executes step S1.

[0081] In a preferred embodiment, the step S1 includes:

[0082] Step S0: Control the first air intake control unit 1 to open, and prepare the feed cylinder 14 with a preset pressure. The setting of step S0 enables the filling section pipeline to drain the water from the feed pipeline under the sterile air preparation pressure of 0.2-1 bar during the drainage process.

[0083] In a preferred embodiment, step S2 comprises:

[0084] S21: Control the first air intake control unit 1, the feed valve 2, and the drain valve 7 at the lowest point of the pipeline to open, and control the drain valve 3 at the top of the material to close, so that the water in the climbing section is discharged, and the sterile air is used to cool the feed pipeline;

[0085] S22: After the drain valve 7 at the lowest point of the pipeline is opened for a first preset time, the feed valve 2 and the drain valve 7 at the lowest point of the pipeline are controlled to be closed.

[0086] Specifically, the first preset time is determined according to the length of the feed pipe to determine the time to drain the water and cool it to below 50°C. When the time is up, the feed valve 2 and the drain valve 7 at the lowest point of the pipe are automatically controlled to close. At this time, the water in the feed pipe is drained and the temperature is low, and the feed operation can be performed.

[0087] In a preferred embodiment, step S2 further comprises:

[0088] Determine the pressure of the feed pipeline;

[0089] When the pressure of the feed pipeline is less than the first preset value, the drain valve 7 at the lowest point of the control pipeline is closed;

[0090] When the pressure of the feed pipeline is greater than the second preset value, the drain valve 7 at the lowest point of the pipeline is controlled to open. The first preset value is 20mbar-200mbar, specifically, the first preset value can be 100mbar, and the second preset value is 300mbar-2000mbar, specifically, the second preset value can be 500mbar. Before opening the drain valve 7 at the lowest point of the pipeline, it is determined whether the pressure value detected by the pressure sensor 8 is greater than 500mbar. If it is greater, it is considered that the pipeline sterile air backup pressure is sufficient, and the opening of the drain valve 7 at the lowest point of the pipeline will not cause the risk of pollution from the external environment to pour into the sterile pipeline. During the drainage process of the climbing section, when the pressure value detected by the pressure sensor 8 is less than 100mbar, it is considered that there is a risk of external air pouring. At this time, the drain valve 7 at the lowest point of the pipeline is controlled to close until the pressure value detected by the pressure sensor 8 is greater than 500mbar, and then the drain valve 7 at the lowest point of the pipeline is opened.

[0091] In a preferred embodiment, step S3 comprises:

[0092] Step S31: Control the tank bottom valve 10, the feed valve 9, the feed pump 6, and the material top gas exhaust valve 3 to open, so that the feed liquid in the fluid delivery source 11 enters the feed pipe, and the feed liquid pushes the sterile air to be discharged through the material top gas exhaust valve 3. In this embodiment, by opening the feed pump 6, the pressure of the feed pump 6 causes the feed liquid to push the sterile air to be discharged through the material top gas exhaust valve 3.

[0093] In a preferred embodiment, step S31 specifically includes:

[0094] The tank bottom valve 10, the feed valve 9, the bypass valve 5, and the material top gas exhaust valve 3 are controlled to be opened, and the bypass valve 5 is controlled to be closed and the feed pump 6 is turned on after the bypass valve 5 is opened for a second preset time. In this embodiment, the second preset time can be 10-60 seconds, so that the sterile air from the feed valve 9 to the feed pump 6 is pressed through the feed pump 6, and then the feed pump 6 is turned on, which can avoid damage to the air when the feed pump 6 is turned on.

[0095] In a preferred embodiment, the step S31 further includes the following steps:

[0096] Step S30: Control the second air intake control unit 12 to open, and when the pressure value detected by the tank pressure sensor 17 is greater than or equal to a third preset value, execute step S31. The third preset value is 0-1000 mbar, and specifically, the third preset value may be 100 mbar.

[0097] The control method of the fluid delivery system provided in this embodiment includes the following steps during operation:

[0098] Step 1: After the fluid delivery target and the feed pipe are cleaned and disinfected, the first air intake control unit 1 remains open, and a pressure of 0.2-1 bar is applied to the fluid delivery target cylinder 14. The operator turns on the "second branch drain knob", and at this time, the feed valve 2 and the top gas drain valve 3 are both controlled to open, so that the feed pipe is under a sterile air pressure of 0.2-1 bar, and the water in the second branch between the highest point 4 of the feed pipe and the feed valve 2 is drained.

[0099] Step 2: Close the "drainage knob for the second branch section". At this time, the feed valve 2 and the top gas drain valve 3 are controlled to be closed. Open the "drainage and cooling knob for the climbing section". At this time, first determine whether the pressure value detected by the pipeline pressure sensor 8 is greater than 500mbar. If it is greater, it is considered that the sterile air backup pressure in the pipeline is sufficient, and the opening of the drain valve 7 at the lowest point of the pipeline will not cause the air with a risk of pollution from the external environment to flow back into the sterile pipeline. At this time, the control fluid delivery target feed, bypass valve 5, and drain valve 7 at the lowest point of the pipeline are all opened to drain the hot water from this climbing section and continue to blow sterile air for cooling. In this process, when the pressure value detected by the pipeline pressure sensor 8 is less than 100mbar, it is determined that there is a risk of external air backflow, and the drain valve 7 at the lowest point of the pipeline will be closed. It will be opened again when it is higher than 500mbar. In this way, the hot water is drained and the pipeline is cooled under the protection of 100-500mbar sterile air pressure in the pipeline. The final time for draining the water and cooling it to below 50℃ is determined according to the length of the pipeline. When the time is up, the feed valve 2, the bypass valve 5, and the drain valve 7 at the lowest point of the pipeline are controlled to be closed, and the fluid delivery target is allowed to send a liquid request signal to the pretreatment.

[0100] Step 3: When the operator sees that the fluid delivery target is allowed to send a feed request signal to the fluid delivery source 11, the operator sends a feed request signal to the pre-processor. At this time, the second air intake control unit 12 is controlled to open, and when the pressure detected by the tank pressure sensor 17 is ≥100mbar, the material top gas discharge valve 3, bypass valve 5, feed valve 9, and tank bottom valve 10 are controlled to open, and the feed pump 6 is delayed for 10-60 seconds before opening. The air from the feed valve 9 to the feed pump 6 is pressed over the feed pump 6 by the sterile air pressure in the fluid delivery source 11 and the static pressure of the liquid, so as to avoid damage to the air when the feed pump 6 is turned on. After 10-60 seconds, the feed pump 6 is turned on, the bypass valve 5 is closed, and the sterile air in the entire feed pipeline is discharged from the material top gas discharge valve 3 by the pressure of the feed pump 6.

[0101] Example 3

[0102] This embodiment provides a control method using a fluid delivery system, and the control method is used in the fluid delivery system provided in Embodiment 1. The difference between this embodiment and Embodiment 2 is that:

[0103] Step S1 includes: controlling the feed valve 2 and opening the cleaning reflux pump 13 to discharge the water from the highest point 4 to the feed valve 2 .

[0104] In this embodiment, step S1 can be used at the end of cleaning and disinfection to drain the hot water in the second branch by adding a reflux delay function, without the need for manual operation by the operator, and also realizes the manual operation error prevention function.

[0105] Specifically in this embodiment, the following steps are included:

[0106] Step S1: Control the feed valve 2 and the cleaning reflux pump 13 to open and discharge the water from the highest point 4 to the feed valve 2. Add a reflux evacuation delay function after cleaning and disinfection to drain the hot water in the second branch. Figure 2 As shown, in the stage of evacuating the reflux pump for cleaning and disinfecting the fluid transport target, the time is delayed for 2-3 cleaning cycles of the fluid transport target (generally, it takes 3 minutes for all branch pipes to be opened for one cleaning cycle of the fluid transport target). When the feed valve 2, the top air exhaust valve 3, and the cleaning reflux pump 13 are all opened, the hot water in the second branch section from the highest point 4 of the feed pipe to the fluid transport target is drained by gravity to the cleaning reflux cylinder 16 and then pumped away.

[0107] The S2 step includes:

[0108] Control the first air intake control unit 1, the feed valve 2, and the drain valve 7 at the lowest point of the pipeline to open, and control the drain valve 3 at the top of the material to close, so that the water in the climbing section can be discharged, and the sterile air can be used to cool the feed pipeline;

[0109] After the drain valve 7 at the lowest point of the pipeline is opened for the first preset time, the feed valve 2 and the drain valve 7 at the lowest point of the pipeline are controlled to be closed.

[0110] Under the protection of the sterile air positive pressure of the fluid delivery target, the hot water in the climbing section from the highest point 4 of the supply pipeline to the lowest point of the pipeline is drained. Figure 3 As shown, after the cleaning reflux pump 13 is evacuated and closed after the delay, the top gas discharge valve 3 is closed, the first air intake control unit 1 is opened, and the discharge valve 7 at the lowest point of the pipeline is opened. Under the monitoring of the pipeline pressure sensor 8, the hot water in the climbing section is emptied. Then continue to blow sterile air to cool the entire pipeline (including the second branch section) to below 50°C. According to the pipeline length, sterile air and ambient temperature, the pipeline can be cooled to the required range in 5-10 minutes.

[0111] Step S3: control the tank bottom valve 10, the feed valve 9, the bypass valve 5, and the material top gas exhaust valve 3 to be opened, and after the bypass valve 5 is opened for a second preset time, control the bypass valve 5 to be closed and the feed pump 6 to be turned on, so that the material liquid in the fluid delivery source 11 enters the feed pipeline, and the material liquid pushes the sterile air to be discharged through the material top gas exhaust valve 3.

[0112] To achieve top gasification of feed pipe material, such as Figure 4As shown, after the hot water in the entire pipeline is emptied and the pipe wall is cooled to below 50°C, the feed valve 2 and the drain valve 7 at the lowest point of the pipeline are closed, the second air intake control unit 12 remains open after the disinfection of the fluid delivery source 11 is completed, the bypass valve 5 remains open after the pipeline is disinfected, the tank bottom valve 10, the feed valve 9, and the material top gas drain valve 3 are opened in sequence, and the material liquid is filled in the pipeline before the feed pump 6 by the static pressure of the fluid delivery source 11 and the tank pressure sensor 17 to detect the pressure (≥100mbar) to prevent the pump from being emptied. The second preset time generally takes 10-60 seconds according to the pipeline model, site layout, and working conditions. This solution specifically takes 30 seconds. After 30 seconds, the bypass valve 5 is closed, the feed pump 6 is opened, and the pump pressure is used to make the material liquid push against the sterile air in the pipeline to the material top gas drain valve 3. This process generally takes 120-240 seconds according to the pipeline model, site layout, and working conditions.

[0113] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A fluid delivery system, characterized in that: include: A fluid delivery target comprises a material cylinder (14) and a fluid output unit (15), wherein the material cylinder (14) is connected to a first air intake control unit (1) and a feed valve (2), wherein the first air intake control unit (1) is adapted to control the introduction of sterile air into the material cylinder (14), and the fluid output unit (15) is connected to a cleaning return pipeline; A fluid delivery source (11) is provided with a feed valve (9), wherein the feed valve (9) is connected to the feed valve (2) via a feed pipeline; The feed pipe is provided with a highest point (4), the height of the highest point (4) is higher than the height of the feed valve (2), a drainage branch is connected between the feed pipe near the feed valve (2) and the cleaning return pipeline, and a material top gas discharge valve (3) is provided on the drainage branch. The feed pipeline comprises a first branch section connected to the fluid delivery source (11), a climbing section connected to the first branch section, and a second branch section connected to the climbing section and the feed valve (2), the top of the climbing section being the highest point (4) of the feed pipeline, a pipeline lowest point drain valve (7) being provided on the first branch section, a feed pump (6) being provided on the first branch section, a bypass branch being provided in parallel with the feed pump (6), and a bypass valve (5) being provided on the bypass branch.

2. The fluid delivery system according to claim 1, characterized in that: A pressure sensor (8) is provided on the first branch section, and the pressure sensor (8) is arranged on a side of the drain valve (7) at the lowest point of the pipeline away from the climbing section.

3. The fluid delivery system according to claim 1, characterized in that: The fluid delivery source (11) is connected to a second air intake control unit (12), and the second air intake control unit (12) is suitable for controlling the introduction of sterile air into the fluid delivery source (11).

4. The fluid delivery system according to claim 1, characterized in that: A tank bottom valve (10) is provided at the bottom of the fluid delivery source (11), and / or a tank pressure sensor (17) is provided inside the fluid delivery source (11).

5. The fluid delivery system according to claim 1, characterized in that: The slope of the climbing section is greater than or equal to 50%.

6. The fluid delivery system according to claim 1, characterized in that: The second branch section is arranged obliquely.

7. The fluid delivery system according to claim 6, characterized in that: The slope of the second branch section is 0.5%-50%.

8. A control method using the fluid delivery system according to any one of claims 1 to 7, characterized in that: include: Drain the water from the highest point (4) to the feed valve (2); Controlling the first air intake control unit (1) and the feed valve (2) to open so that the feed pipe is filled with sterile air; The feed valve (9) and the material top air exhaust valve (3) are controlled to open, so that the material liquid in the fluid delivery source (11) enters the feed pipeline, and the material liquid pushes the sterile air to be discharged through the material top air exhaust valve (3).

9. The control method of the fluid delivery system according to claim 8, characterized in that: The step of discharging water from the highest point (4) to the feed valve (2) comprises: The first air intake control unit (1) and the feed valve (2) are controlled to open, so that during the process of water discharge from the highest point (4) to the feed valve (2), a positive pressure of sterile air is maintained in the feed pipe.

10. The control method of the fluid delivery system according to claim 8, characterized in that: The step of discharging water from the highest point (4) to the feed valve (2) comprises: The feed valve (2) and the cleaning reflux pump (13) are controlled to open, and the water from the highest point (4) to the feed valve (2) is discharged.

11. The control method of the fluid delivery system according to claim 9 or 10, characterized in that: The step of discharging water from the highest point (4) to the feed valve (2) further comprises: Control the material top gas exhaust valve (3) to open.

12. The control method of the fluid delivery system according to claim 11, characterized in that: The step of controlling the first air intake control unit (1) and the feed valve (2) to open so that the feed pipe is filled with sterile air comprises: Control the first air intake control unit (1), the feed valve (2), and the drain valve (7) at the lowest point of the pipeline to open, and control the drain valve (3) at the top of the material to close, so that the water in the climbing section is discharged, and sterile air is used to cool the feed pipeline; After the drain valve (7) at the lowest point of the pipeline is opened for a first preset time, the feed valve (2) and the drain valve (7) at the lowest point of the pipeline are controlled to be closed.

13. The control method of the fluid delivery system according to claim 12, characterized in that: The step of controlling the first air intake control unit (1) and the feed valve (2) to open so that the feed pipe is filled with sterile air also includes: Determining the pressure of the feed pipeline; When the pressure of the feed pipeline is less than a first preset value, the drain valve (7) at the lowest point of the pipeline is controlled to close; When the pressure of the feed pipeline is greater than a second preset value, the drain valve (7) at the lowest point of the pipeline is controlled to open.

14. The control method of the fluid delivery system according to claim 12, characterized in that: The step of controlling the feed valve (9) and the material top air exhaust valve (3) to open so that the material liquid in the fluid delivery source (11) enters the feed pipe, and the material liquid pushes the sterile air to be discharged through the material top air exhaust valve (3) comprises: The tank bottom valve (10), the feed valve (9), the feed pump (6), and the material top air exhaust valve (3) are controlled to open, so that the material liquid in the fluid delivery source (11) enters the feed pipe, and the material liquid pushes the sterile air to be discharged through the material top air exhaust valve (3).

15. The control method of the fluid delivery system according to claim 14, characterized in that: The control tank bottom valve (10), the feed valve (9), the feed pump (6), and the material top gas exhaust valve (3) are opened to allow the material liquid in the fluid delivery source (11) to enter the feed pipeline, and the material liquid pushes the sterile air to be discharged through the material top gas exhaust valve (3) comprising the following steps: The tank bottom valve (10), the feed valve (9), the bypass valve (5), and the material top gas exhaust valve (3) are controlled to be opened, and after the bypass valve (5) is opened for a second preset time, the bypass valve (5) is controlled to be closed and the feed pump (6) is turned on.

16. The control method of the fluid delivery system according to claim 15, characterized in that: Before the step of controlling the tank bottom valve (10), the feed valve (9), the feed pump (6), and the material top gas exhaust valve (3) to open so that the material liquid in the fluid delivery source (11) enters the feed pipe and the material liquid pushes the sterile air to be discharged through the material top gas exhaust valve (3), the method further comprises: The second air intake control unit (12) is controlled to open, and when the pressure value detected by the tank pressure sensor (17) is greater than or equal to a third preset value, the step of controlling the feed valve (9) and the material top air exhaust valve (3) to open is executed, so that the material liquid in the fluid delivery source (11) enters the feed pipeline, and the material liquid pushes the sterile air to be discharged through the material top air exhaust valve (3).

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