Bubble water making apparatus and system

Abstract

The application discloses a kind of bubble water making device and system.The device includes tank, air inlet, stirring mechanism, liquid inlet and liquid outlet.Tank has sealed cavity inside, and gas collection space is reserved above the liquid level of cavity;Air inlet bottom is connected with gas guide pipe, and microporous aeration head is arranged at the lower end of gas guide pipe;Stirring mechanism includes shaft sleeve, stirring paddle and impact impeller, and shaft sleeve is rotatably connected with gas guide pipe;Liquid inlet bottom is connected with liquid inlet pipe, and liquid inlet pipe lower end forms jet nozzle, and beverage stock solution is pushed to rotate impact impeller by forming jet flow through jet nozzle, to drive stirring paddle to rotate synchronously.The application increases gas-liquid contact area by microporous aeration head, prolongs gas-liquid contact time by cooperating with self-driven stirring mechanism, promotes bubble dispersion by using reverse guide plate, and recycles dissipated gas by circulating gas pipe.The device is simple and reliable in structure, without external motor, suitable for household and commercial scenarios.

Description

Technical Field

[0001] This invention relates to the field of beverage production technology, specifically to a sparkling water making apparatus and system. Background Technology

[0002] Sparkling water (also known as carbonated water or soda water) is a beverage made by dissolving carbon dioxide gas in water under pressure. Its unique taste and potential health benefits (such as aiding digestion) make it widely popular. The key to making sparkling water lies in how efficiently and evenly dissolve carbon dioxide in water, which is mainly affected by gas pressure and the efficiency of gas-liquid contact.

[0003] Traditional methods for producing sparkling water typically employ techniques to optimize gas-liquid contact efficiency. Two typical approaches are as follows:

[0004] (1) Water is sprayed into a container filled with high-pressure carbon dioxide in the form of a mist, and the increased surface area of ​​the water mist is used to promote gas dissolution. Although the atomization method can increase the contact area, it requires high water pressure and a complex spray system, which increases energy consumption and equipment costs.

[0005] (2) Pressurizing and injecting gas directly into still water in a container. Pressurized gas injection results in low carbon dioxide dissolution efficiency due to the large size of the bubbles and insufficient contact with the water, making it difficult to achieve a high concentration and uniform dissolution effect. Increasing the gas pressure can improve the amount of carbon dioxide dissolved to some extent, but this method is constrained by various factors such as high equipment sealing requirements, material strength limitations, increased safety risks, and increased energy consumption. Moreover, the improvement in carbon dioxide dissolution efficiency due to increased gas pressure is not linear; after the gas pressure reaches a certain range, the gain in carbon dioxide solubility gradually decreases. The increase in water temperature caused by pressurization affects the carbon dioxide dissolution effect, but achieving precise temperature control in a high-pressure system becomes more difficult and expensive. Furthermore, high-pressure systems are more prone to wear and failure, requiring regular inspection and maintenance, increasing the cost and inconvenience of long-term use.

[0006] To address the aforementioned issues, existing technologies have proposed various improvement schemes, each with its own limitations. For example, some devices add a stirring paddle inside the tank (such as patent CN2927915Y), using an external drive device to force gas-liquid mixing. While this improves dissolution uniformity, it introduces a dynamic sealing structure, increasing the risk of leakage and mechanical complexity. Other solutions (such as patent CN1059853A) employ a microporous refining head to introduce carbon dioxide into the water in the form of tiny bubbles, significantly increasing the gas-liquid contact area and effectively improving the dissolution rate. However, the dissolution uniformity is insufficient, especially with differences in solubility at different liquid levels, resulting in inconsistent taste of the finished product. Furthermore, for household or small-scale commercial applications, the device's integration, safety, and ease of maintenance also need to be considered.

[0007] Therefore, developing a sparkling water production device that can overcome the shortcomings of existing technologies and combine low energy consumption, high efficiency, high reliability, and low cost has significant practical significance and application value. Summary of the Invention

[0008] The present invention aims to overcome the technical defects of existing sparkling water production methods, such as low dissolution efficiency, high energy consumption, complex structure, and poor reliability, and to provide a sparkling water production device and system with low energy consumption, high efficiency, high reliability, and low cost.

[0009] To achieve the above objectives, the present invention adopts the following technical solution.

[0010] Sparkling water making device, including:

[0011] The tank has a sealed cavity inside for storing the beverage concentrate to be dissolved in carbon dioxide. The cavity has a space reserved on the surface of the beverage concentrate for collecting the dissipated carbon dioxide.

[0012] An air inlet is located at the top center of the tank body and is used to introduce high-pressure carbon dioxide from the outside. A vertical air guide pipe is connected to the bottom of the air inlet and extends into the bottom of the cavity. A microporous aeration head is connected in series at the lower end of the air guide pipe and is used to disperse and release the carbon dioxide introduced into the tank body from the bottom of the cavity as tiny bubbles with a diameter of 50-300μm.

[0013] The stirring mechanism has a bushing that is rotatably fitted on the air guide pipe, and the bushing has a radially extending stirring paddle on its outer periphery. An impact impeller is also coaxially provided at the lower part of the bushing.

[0014] The liquid inlet is located at the top of the tank and to the left of the air inlet, for pumping beverage concentrate from the outside; the bottom of the liquid inlet is connected to a liquid inlet pipe that enters the cavity, and the lower end of the liquid inlet pipe is bent to form a nozzle that cooperates with the impeller. The beverage concentrate pumped into the cavity forms a jet that pushes the impeller through the nozzle, and the impeller drives the stirring paddle on the shaft sleeve to rotate synchronously, for stirring the beverage concentrate to promote gas-liquid mixing;

[0015] The liquid outlet is located at the top of the tank and to the right of the air inlet. The bottom of the liquid outlet is connected to a liquid outlet pipe that enters the cavity, which is used to extract the finished beverage product from the cavity from the outside.

[0016] Preferably, the sidewall of the cavity is provided with at least one anti-flow guide plate extending vertically and vertically around its central axis in a spiral shape. The spiral direction of the anti-flow guide plate is opposite to the rotation direction of the stirring paddle. This is used to transform the circulation of the rotating beverage concentrate into a composite flow field with a downward axial component, so as to suppress the upward escape of carbon dioxide microbubbles and promote their uniform dispersion and dissolution in the beverage concentrate.

[0017] Preferably, a plurality of the reverse guide vanes are equidistantly distributed around the central axis of the cavity.

[0018] Preferably, a plurality of agitators are provided at axial intervals along the bushing.

[0019] Preferably, the impeller comprises at least two blades symmetrically arranged circumferentially along the main axis; in the direction of rotation of the impeller, the leading edge of the blades is thinner than the trailing edge to generate a radial shear flow field during rotation, which is used to further break up carbon dioxide microbubbles.

[0020] Preferably, the microporous aerator head is made of sintered stainless steel powder, and its entire body is formed with air-permeable micropores of 50-300μm. Its top surface is welded to the lower end of the air guide pipe. Through the microporous structure of the microporous aerator head, the high-pressure carbon dioxide introduced through the air guide pipe is dispersed into tiny bubbles that escape from the surface.

[0021] Preferably, the top of the tank is also provided with a liquid level sensor, which has a short electrode that extends downward into the cavity to monitor the highest liquid level and a long electrode that monitors the lowest liquid level. Both the short electrode and the long electrode are electrically connected to an external control device.

[0022] Preferably, a circulating air pipe is also provided in the cavity, with its upper end extending upward into the gas collection space and its lower end connecting to the nozzle. The circulating air pipe constructs a return air passage for the carbon dioxide collected in the gas collection space to enter the nozzle, and the jet from the nozzle carries the carbon dioxide in the return air passage back into the beverage concentrate.

[0023] Preferably, the top of the tank is also provided with a pressure relief valve, the lower end of which is connected to the gas collection space.

[0024] Based on the above-mentioned sparkling water making apparatus, the present invention also provides a sparkling water making system that can further enhance the carbon dioxide solubility, the system comprising:

[0025] A container for storing beverage concentrate;

[0026] A high-pressure gas source is used to provide high-pressure carbon dioxide;

[0027] A reaction unit employs any of the above-described sparkling water making apparatus;

[0028] A liquid inlet pipe is connected in series between the liquid inlet and the original liquid container, and is used to transport the beverage concentrate in the original liquid container to the reaction unit. A first valve is connected in series in the liquid inlet pipe.

[0029] A liquid outlet pipe is connected to a liquid outlet for drawing the finished beverage product from the cavity from the outside. A second valve is connected in series in the liquid outlet pipe.

[0030] An external circulation pipeline is connected between the inlet pipeline and the outlet pipeline. One end of the external circulation pipeline is connected between the first valve and the inlet, and the other end is connected between the second valve and the outlet. A diaphragm pump is also connected in series in the external circulation pipeline.

[0031] The diaphragm pump is configured as follows: when the first valve and the second valve are closed, the diaphragm pump forces the beverage concentrate in the cavity through the cavity. Liquid outlet External circulation pipeline The liquid flows in a sequential cycle at the inlet.

[0032] Compared with the prior art, the present invention has the following positive effects:

[0033] (1) Carbon dioxide is dispersed into tiny bubbles of 50-300μm through the microporous aeration head, increasing the specific surface area; combined with the impeller-driven stirring paddle, the gas-liquid contact time is extended, significantly improving the dissolution efficiency of carbon dioxide.

[0034] (2) The self-driven stirring mechanism driven by jet does not require an external motor and can achieve stirring by relying only on the kinetic energy of the liquid, which greatly reduces energy consumption;

[0035] (3) The reverse guide plate transforms the circulation into a composite flow field with a downward axial component, eliminating the fluctuation in carbon dioxide solubility caused by the difference in liquid level height.

[0036] (4) The stirring mechanism adopts a static sealing design and has no dynamic sealing structure, which significantly reduces maintenance costs;

[0037] (5) The circulating gas tube reintroduces the escaped carbon dioxide into the nozzle, which significantly improves gas utilization and reduces waste;

[0038] (6) Dual protection with pressure relief valve and liquid level sensor to avoid overpressure and overflow risks;

[0039] (7) It is suitable for both small household units of 1-5L and medium-sized commercial units of 10-50L, and can be flexibly configured;

[0040] (8) Compared with traditional atomization devices, it significantly reduces the production cost of sparkling water and has outstanding cost performance. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the bubble-making device in this invention.

[0042] Figure 2 This is a cross-sectional schematic diagram of the bubble-making device in this invention.

[0043] Figure 3 This is a schematic diagram illustrating the working principle of the stirring mechanism in this invention.

[0044] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle.

[0045] Figure 5 This is a schematic diagram illustrating the working principle of the reverse guide plate in this invention.

[0046] Figure 6 This is a schematic diagram illustrating the working principle of the circulating airway in this invention.

[0047] Figure 7 This is a schematic diagram of the bubble-making system in this invention.

[0048] Explanation of reference numerals in the attached figures:

[0049] 100-Tank body, 101-Cavity, 102-Gas collection space, 110-Air inlet, 111-Air guide pipe, 112-Microporous aerator head, 120-Agitator mechanism, 121-Shaft sleeve, 122-Agitator blade, 123-Impact impeller, 124-Blade, 125-Leading edge, 126-Tail edge, 130-Liquid inlet, 131-Liquid inlet pipe, 132-Nozzle, 140-Liquid outlet 141-Outlet pipe, 150-Reverse guide plate, 160-Circulating gas pipe, 170-Level sensor, 171-Short electrode, 172-Long electrode, 180-Pressure relief valve, 200-Supporting liquid container, 210-High-pressure gas source, 220-Inlet pipe, 221-First valve, 230-Outlet pipe, 231-Second valve, 240-External circulation pipe, 241-Diaphragm pump. Detailed Implementation

[0050] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0051]

Example 1

[0052] This embodiment illustrates the basic structure of the sparkling water making apparatus of the present invention.

[0053] like Figures 1 to 4 As shown, the sparkling water making apparatus of the present invention includes a tank 100, an air inlet 110, a stirring mechanism 120, a liquid inlet 130, and a liquid outlet 140.

[0054] The canister 100 is made of 304 stainless steel and has a volume of 5L. It has a sealed cavity 101 inside. The cavity 101 has a gas collection space 102 with a height of about 50mm reserved on the surface of the beverage concentrate to collect the emitted carbon dioxide.

[0055] An air inlet 110 is located at the top center of the tank 100, used to introduce high-pressure carbon dioxide with a working pressure of 0.3-0.6 MPa from the outside. A vertical air guide pipe 111 is connected to the bottom of the air inlet 110, extending into the bottom of the cavity 101. A microporous aerator head 112 is connected in series at the lower end of the air guide pipe 111. The microporous aerator head 112 is made of 316L stainless steel powder sintered, with permeable micropores of 50-300 μm formed throughout, and its top surface is welded to the lower end of the air guide pipe 111. During operation, high-pressure carbon dioxide enters the microporous aerator head 112 through the air guide pipe 111, disperses and releases from the micropores as tiny bubbles with a diameter of 50-300 μm, and rises from the bottom of the cavity 101.

[0056] The stirring mechanism 120 has a bushing 121 rotatably fitted onto the air guide pipe 111. The outer periphery of the bushing 121 has a radially extending stirring blade 122. An impact impeller 123 is also coaxially provided at the lower part of the bushing 121. The blades 124 of the stirring blade 122 have a leading edge 125 that is thinner than the trailing edge 126 in the direction of rotation. Preferably, the leading edge 125 is 0.3 mm thick and the trailing edge 126 is 1.5 mm thick, so as to generate a radial shear flow field during rotation, further breaking up the carbon dioxide microbubbles.

[0057] The liquid inlet 130 is located at the top of the tank 100 and to the left of the air inlet 110, for pumping beverage concentrate from the outside. The bottom of the liquid inlet 130 is connected to an inlet pipe 131 that leads into the cavity 101. The lower end of the inlet pipe 131 is bent to form a nozzle 132 that mates with the impeller 123. The beverage concentrate pumped into the cavity 101 forms a kinetic jet through the nozzle 132, impacting the impeller 123 and driving the stirring paddle 122 on the drive bushing 121 to rotate synchronously, thus agitating the beverage concentrate to promote gas-liquid mixing.

[0058] The liquid outlet 140 is located at the top of the tank 100 and to the right of the air inlet 110. The bottom of the liquid outlet 140 is connected to a liquid outlet pipe 141 that enters the cavity 101 for external extraction of the finished beverage product from the cavity 101.

[0059] The top of the tank 100 is also equipped with a liquid level sensor 170, which has a short electrode 171 that extends downward into the cavity 101 to monitor the highest liquid level and a long electrode 172 that monitors the lowest liquid level. Both the short electrode 171 and the long electrode 172 are electrically connected to an external control device to realize automatic liquid level control.

[0060] The top of the tank 100 is also equipped with a pressure relief valve 180. The lower end of the pressure relief valve 180 is connected to the gas collection space 102. The pressure relief valve 180 is set to a pressure of 0.7 MPa for overpressure protection.

[0061] Preferably, a plurality of agitators 122 are provided at intervals along the axial direction of the bushing 121.

[0062] In this embodiment, high-pressure carbon dioxide enters the microporous aeration head 112 through the air inlet 110 and the air guide pipe 111, and disperses into tiny bubbles of 50-300μm, which rise from the bottom of the cavity 101. The beverage concentrate forms a high-speed jet 133 through the liquid inlet 130, the liquid inlet pipe 131, and the nozzle 132, which impacts the impeller 123 and drives the stirring paddle 122 to rotate. The stirring paddle 122 agitates the beverage concentrate, forming a circulation, which promotes full contact between the carbon dioxide microbubbles and the beverage concentrate, and improves the dissolution efficiency.

[0063]

Example 2

[0064] This embodiment illustrates a preferred implementation of the present invention.

[0065] Based on Example 1, this embodiment further includes the following preferred features:

[0066] like Figure 5 As shown, the sidewall of cavity 101 is provided with three counter-flow guide plates 150 extending vertically and vertically around its central axis in a spiral pattern. The spiral angle is 45° and the height is 200 mm. The spiral direction of the counter-flow guide plates 150 is opposite to the rotation direction of the stirring paddle 122. During operation, the counter-flow guide plates 150 transform the circulation of the beverage concentrate into a composite flow field with a downward axial component, suppressing the upward escape of carbon dioxide microbubbles and promoting their uniform dispersion and dissolution in the beverage concentrate.

[0067]

Example 3

[0068] This embodiment illustrates another preferred implementation of the present invention.

[0069] Based on Example 1 or Example 2, this embodiment further includes the following preferred features:

[0070] like Figure 6 As shown, a circulating air pipe 160 is also provided inside the cavity 101, with its upper end extending upward into the gas collection space 102 and its lower end connecting to the nozzle 132. The circulating air pipe 160 constructs a return air passage for the carbon dioxide collected in the gas collection space 102, which then flows into the nozzle 132. The jet from the nozzle 132 carries the carbon dioxide in the return air passage back into the beverage concentrate.

[0071] In this embodiment, the escaped carbon dioxide is reintroduced into the nozzle 132 via the recirculation pipe 160, thereby improving gas utilization.

[0072]

Example 4

[0073] This embodiment is used to illustrate the sparkling water production system of the present invention.

[0074] like Figure 7 As shown, the sparkling water production system of the present invention includes a raw liquid container 200, a high-pressure gas source 210, a reaction unit, a liquid inlet pipe 220, a liquid outlet pipe 230, and an external circulation pipe 240, wherein the reaction unit adopts any one of the sparkling water production devices in Examples 1-3.

[0075] The 200 container is a 5L food-grade PE bucket used to store beverage concentrates.

[0076] The high-pressure gas source 210 is a carbon dioxide cylinder, which is adjusted to 0.3-0.6MPa via a pressure reducing valve.

[0077] The liquid inlet pipe 220 is connected in series between the liquid inlet 130 and the raw liquid container 200. It uses Φ6mm silicone tubing. The liquid inlet pipe 220 is connected in series with a first valve 221, which can be a manual valve or a solenoid valve.

[0078] The liquid outlet pipe 230 is connected to the liquid outlet 140 and uses a Φ6mm silicone tube. A second valve 231 is connected in series in the liquid outlet pipe 230, which can also be a manual valve or a solenoid valve.

[0079] The external circulation pipeline 240 is connected between the inlet pipeline 220 and the outlet pipeline 230. One end is connected between the first valve 221 and the inlet 130, and the other end is connected between the second valve 231 and the outlet 140. A diaphragm pump 241 is also connected in series in the external circulation pipeline 240.

[0080] The specific working mode of the sparkling water production system in this embodiment is as follows.

[0081] (1) Normal working mode.

[0082] Open the first valve 221 and the second valve 231, close the diaphragm pump 241, and the beverage concentrate enters the reaction unit from the concentrate container 200 through the inlet pipe 220. After carbonation, it is output through the outlet pipe 230.

[0083] (2) Cyclic reinforcement mode.

[0084] Close the first valve 221 and the second valve 231, and open the diaphragm pump 241 to allow the beverage concentrate in cavity 101 to flow through cavity 101. Liquid outlet 140 External circulation pipeline 240 The sequential circulation of liquid inlet 130 repeatedly mixes gas and liquid, thereby significantly increasing the amount of carbon dioxide dissolved.

[0085] To visually demonstrate the technical effects of this invention, compared to the production methods of traditional devices in the prior art, the sparkling water production system of this embodiment uses the same process parameters: 5L of beverage concentrate, carbon dioxide pressure 0.5MPa, and beverage concentrate flow rate 2L / min. The following is a comparison of some parameters of the sparkling water production process and finished product obtained from the operational tests:

[0086] parameter Traditional devices This invention Improvement effect Dissolution time (up to 4.0 vol) 90s 42s ↓53% Uniformity of dissolution (liquid level difference) ±15% ±4% ↑73% Gas utilization rate 65% 92% ↑42% Energy consumption (stirring) 50W 0W ↓100% Average bubble diameter 120μm 65μm ↓46%

[0087] Embodiments of the present invention have been shown and described above. Those skilled in the art will recognize that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sparkling water making device, comprising: The tank has a sealed cavity inside for storing the beverage concentrate to be dissolved in carbon dioxide. The cavity has a space reserved on the surface of the beverage concentrate for collecting the dissipated carbon dioxide. An air inlet is located at the top center of the tank body for introducing high-pressure carbon dioxide from the outside; the bottom of the air inlet is connected to a vertical air guide pipe that extends into the bottom of the cavity, and the lower end of the air guide pipe is connected to a microporous aeration head for dispersing and releasing the carbon dioxide introduced into the tank body from the bottom of the cavity into tiny bubbles with a diameter of 50-300μm that are more conducive to dissolution. The stirring mechanism has a bushing rotatably fitted on the air guide pipe, and the bushing has a radially extending stirring paddle on its outer periphery. An impact impeller is also coaxially provided at the lower part of the bushing. The liquid inlet is located at the top of the tank and to the left of the air inlet, for pumping beverage concentrate from the outside; the bottom of the liquid inlet is connected to a liquid inlet pipe that enters the cavity, and the lower end of the liquid inlet pipe is bent to form a nozzle that cooperates with the impeller. The beverage concentrate pumped into the cavity forms a jet that pushes the impeller through the nozzle, and the impeller drives the stirring paddle on the shaft sleeve to rotate synchronously, for stirring the beverage concentrate to promote gas-liquid mixing; The liquid outlet is located at the top of the tank and to the right of the air inlet. The bottom of the liquid outlet is connected to a liquid outlet pipe that enters the cavity, which is used to extract the finished beverage product from the cavity from the outside.

2. The sparkling water making apparatus as described in claim 1, characterized in that, The cavity has at least one anti-flow guide plate extending vertically and vertically around its central axis in a spiral shape. The spiral direction of the anti-flow guide plate is opposite to the rotation direction of the stirring paddle. This is used to transform the circulation of the rotating beverage concentrate into a composite flow field with a downward axial component, so as to suppress the upward escape of carbon dioxide microbubbles and promote their uniform dispersion and dissolution in the beverage concentrate.

3. The sparkling water making apparatus as described in claim 2, characterized in that, Multiple reverse guide vanes are equidistantly distributed around the central axis of the cavity.

4. The sparkling water making apparatus as described in claim 1, characterized in that, Multiple agitators are spaced apart along the axial direction of the bushing.

5. The sparkling water making apparatus as described in claim 1, characterized in that, The impeller includes at least two blades symmetrically arranged circumferentially along the main axis; in the direction of rotation of the impeller, the leading edge of the blades is thinner than the trailing edge to generate a radial shear flow field during rotation, which is used to further break up carbon dioxide microbubbles.

6. The sparkling water making apparatus as described in claim 1, characterized in that, The microporous aerator head is made of sintered stainless steel powder, and its entire body is formed with air-permeable micropores of 50-300μm. Its top surface is welded to the lower end of the air guide pipe. Through the microporous structure of the microporous aerator head, the high-pressure carbon dioxide introduced through the air guide pipe is dispersed into tiny bubbles that escape from the surface.

7. The sparkling water making apparatus as described in claim 1, characterized in that, The top of the tank is also equipped with a liquid level sensor, which has a short electrode that extends downward into the cavity to monitor the highest liquid level and a long electrode that monitors the lowest liquid level. Both the short electrode and the long electrode are electrically connected to an external control device.

8. The sparkling water making apparatus as described in claim 1, characterized in that, A circulating air pipe is also provided inside the cavity, with its upper end extending upward into the gas collection space and its lower end connecting to the nozzle. The circulating air pipe constructs a return air passage for the carbon dioxide collected in the gas collection space to enter the nozzle, and the jet from the nozzle carries the carbon dioxide in the return air passage back into the beverage liquid.

9. The sparkling water making apparatus as described in claim 1, characterized in that, The top of the tank is also equipped with a pressure relief valve, the lower end of which is connected to the gas collection space.

10. A sparkling water production system, characterized in that, include: A container for storing beverage concentrate; A high-pressure gas source is used to provide high-pressure carbon dioxide; A reaction unit, employing the bubble water making apparatus according to any one of claims 1-9; A liquid inlet pipe is connected in series between the liquid inlet and the original liquid container, and is used to transport the beverage concentrate in the original liquid container to the reaction unit. A first valve is connected in series in the liquid inlet pipe. A liquid outlet pipe is connected to a liquid outlet for drawing the finished beverage product from the cavity from the outside. A second valve is connected in series in the liquid outlet pipe. An external circulation pipeline is connected between the inlet pipeline and the outlet pipeline. One end of the external circulation pipeline is connected between the first valve and the inlet, and the other end is connected between the second valve and the outlet. A diaphragm pump is also connected in series in the external circulation pipeline. The diaphragm pump is configured as follows: When the first and second valves are closed, the beverage concentrate in the cavity is pumped through the diaphragm pump. Liquid outlet External circulation pipeline The liquid flows in a sequential cycle at the inlet.

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