Soda water making device and control method thereof

Abstract

The invention relates to a soda water making device and a control method thereof, the soda water making device comprises: a gas inlet unit having a gas inlet channel, the gas inlet end of the gas inlet channel being in fluid communication with a carbon dioxide gas source; the water inlet unit is provided with a water inlet channel, and the water inlet end of the water inlet channel is in fluid communication with a drinking water source; the air inlet unit is further provided with a hollow water flow channel, the two ends of the water flow channel are provided with a water inlet and a liquid outlet respectively, the water inlet is communicated with the water outlet end of the water inlet channel of the water inlet unit, the air inlet channel laterally penetrates through the water flow channel, and a water-air convergence area in the water flow channel is a mixing cavity. And the prepared soda water flows out from the liquid outlet. The water flow channel of the gas inlet unit serves as a mixing cavity for gas-liquid mixing, the gas inlet channel penetrates through the water flow channel from the side direction, and the arrangement of an independent mixing cavity is structurally avoided; a mixing cavity formed by the water flow channel is small in size, waste of carbon dioxide can be reduced when carbon dioxide and drinking water are mixed, and mixing efficiency and liquid outlet efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of non-alcoholic beverage production, and particularly relates to a soda water production device and a control method thereof. Background Art

[0002] With the development of society, nowadays, the application of soda water machines for making soda water is becoming more and more popular. A Chinese invention patent with an application number of 202111587803.8 (publication number CN 114246473 A) discloses a method for instantaneously and quickly making soda water. The soda water machine disclosed in this patent includes a chassis, a gas cylinder mounting seat for mounting a carbon dioxide gas cylinder, a water storage tank for storing drinking water required for making soda water, a soda water mixing tank, and a liquid supply nozzle. The soda water mixing tank includes an air inlet, a liquid inlet, and a liquid outlet. The soda water mixing tank is connected to the carbon dioxide gas cylinder mounted on the gas cylinder mounting seat through the air inlet, is connected to the water storage tank through the liquid inlet, and is connected to the liquid supply nozzle through the liquid outlet. A gas source switch module is serially arranged between the carbon dioxide gas cylinder and the air inlet, a liquid inlet water pump is serially arranged between the water storage tank and the liquid inlet, and a liquid outlet valve is serially arranged between the liquid supply nozzle and the liquid outlet.

[0003] In order to be able to produce soda water with various liquid volumes, this soda water machine is separately provided with a relatively large soda water mixing tank. When carbon dioxide is filled into the soda water mixing tank, if the amount of drinking water in the soda water mixing tank is small, the carbon dioxide will escape above the liquid level of the drinking water, thus wasting carbon dioxide; if the amount of drinking water in the soda water mixing tank is large, the carbon dioxide will mix with the drinking water through slow diffusion, so the gas-liquid mixing efficiency is low and the carbon dioxide concentration in the obtained soda water is not high. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is, in view of the current situation of the prior art, to provide a soda water production device that can achieve high mixing efficiency and continuous water output without separately setting a soda water mixing tank.

[0005] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned soda water production device.

[0006] The technical solution adopted by the present invention to solve the above first technical problem is as follows: The soda water production device includes:

[0007] An air intake unit having an air intake passage, and the air intake end of the air intake passage is used to be in fluid communication with a carbon dioxide gas source;

[0008] A water intake unit having a water intake passage, and the water intake end of the water intake passage is used to be in fluid communication with a drinking water source;

[0009] It is characterized in that the intake unit further has a hollow water flow channel, and both ends of the water flow channel are respectively a water inlet and a liquid outlet, where:

[0010] The water inlet is communicated with the water outlet end of the water inlet channel of the intake unit, and the intake channel penetrates the water flow channel laterally. The area where water and gas converge in the water flow channel is denoted as the mixing chamber;

[0011] And the liquid outlet is used to discharge the finished soda water.

[0012] In order to facilitate the intersection and mixing of water inlet and air intake and the real-time discharge of soda water, the intake unit has a water pipe, and the inner cavity of the water pipe serves as the water inlet channel. The head of the water pipe extends into the water inlet of the water flow channel of the intake unit; the water outlet at the head of the water pipe serves as the water outlet end of the entire water inlet channel, and is opposite to and has a gap with the liquid outlet of the water flow channel of the intake unit. The penetration of the intake channel and the water flow channel is located within this gap, and the cavity where this gap is located is the mixing chamber.

[0013] In order to strengthen the mixing between water inlet and air intake and increase the concentration of carbon dioxide in the soda water, the liquid outlet on the water flow channel is opened on the bottom wall of the water flow channel, and the intake channel is arranged adjacent to this bottom wall;

[0014] A mixer is provided in the water flow channel and above the bottom wall of the water flow channel, including:

[0015] An annular top wall and an inner ring wall and an outer ring wall respectively extending downward from the inner edge and the outer edge of the annular top wall. The three jointly enclose an air guiding groove, where

[0016] The upper surface of the annular top wall abuts against the end face of the head of the water pipe, and the lower end face of the inner ring wall abuts against the bottom wall of the water flow channel, so that the water outlet of the water pipe is communicated with the liquid outlet on the bottom wall of the water flow channel through the central hole surrounded by the inner ring wall;

[0017] An air inlet hole opposite to the air outlet end of the intake channel is opened on the outer ring wall;

[0018] At least two spaced-apart diversion air holes are circumferentially opened on the inner ring wall;

[0019] The inner ring wall of the mixer, the bottom wall of the corresponding water flow channel and the end face of the head of the water pipe jointly define the mixing chamber.

[0020] In order to reduce the residence time of water inlet in the mixing chamber and discharge soda water in real time, the water outlet of the water pipe is arranged at the center of the end face of the head of the water pipe, protrudes downward into the mixing chamber, and is opposite to the liquid outlet on the bottom wall of the water flow channel.

[0021] To prevent the mixer from moving relative to the water flow channel, so as to ensure that the air outlet end on the water flow channel is always in communication with the air inlet hole on the mixer, the outer ring wall of the mixer is attached to the inner peripheral wall of the water flow channel of the air inlet unit, and a protruding positioning block is provided on the inner peripheral wall of the water flow channel, and a positioning groove for accommodating the positioning block is provided at a corresponding position on the outer ring wall of the mixer.

[0022] To enhance the sealing performance of the mixing chamber, an external thread is provided on the outer wall of the water pipe of the water inlet unit, and an internal thread is provided on the corresponding inner wall of the water flow channel of the air inlet unit, and the two are threadedly connected.

[0023] To enhance the sealing performance of the mixing chamber, the water inlet unit is provided with an annular wall connected thereto around its water pipe, and the annular wall is sleeved outside the outer wall of the water flow channel of the air inlet unit, and an internal thread is provided on the inner peripheral wall of the annular wall, and an external thread is provided on the outer wall of the water flow channel of the air inlet unit, and the two are threadedly connected.

[0024] To increase the pressure inside the mixer, along the liquid flow direction, the caliber of the liquid outlet passing through the bottom wall of the water flow channel first decreases from large to small and then increases from small to large, which are the first large-diameter part, the second small-diameter part, and the third large-diameter part respectively, and the second small-diameter part serves as the pressure-holding throttle hole.

[0025] Furthermore, the aperture range of the pressure-holding throttle hole is 0.7 to 1.0 millimeters.

[0026] Furthermore, the third large-diameter part continues to protrude outward from the bottom wall to form a first liquid outlet connecting pipe for flowing out the made soda water. The protruding first liquid outlet connecting pipe is convenient for connecting with the subsequent fine mixing pipe.

[0027] To remix the unmixed gas in the mixing chamber, the first liquid outlet connecting pipe is connected with a fine mixing pipe with a fine mixing chamber; the fine mixing chamber is provided with a second liquid outlet connecting pipe, and the second liquid outlet connecting pipe is communicated with the fine mixing chamber through a flow-limiting hole opened on the chamber wall of the fine mixing chamber.

[0028] Furthermore, the aperture range of the flow-limiting hole is 0.7 to 1.0 millimeters.

[0029] To make the remaining water volume in the pipeline small, the fine mixing pipe is in a long strip shape, and the volume of its fine mixing chamber is not greater than 0.2 liters.

[0030] Furthermore, along the water inlet direction of the water inlet channel, the aperture of the water inlet channel decreases from large to small, and successively includes a large-diameter section, a transition section, and a small-diameter section, and the aperture range of the transition section is 1.5 to 2.0 millimeters.

[0031] In order to automatically control the soda water making device, the soda water making device further includes a controller, and an electromagnetic valve is provided on the pipeline connected to the second liquid outlet connecting pipe, and the controller is used to control the opening and closing of the electromagnetic valve.

[0032] Further, a water pump is provided on the connecting pipeline between the drinking water source and the water inlet channel, and the controller is electrically connected to the water pump to control whether the water pump pumps drinking water into the mixing chamber; the carbon dioxide gas source is a carbon dioxide gas cylinder, and a high-pressure switch is provided on the connecting pipeline between the outlet of the carbon dioxide gas cylinder and the air inlet channel, and the controller is electrically connected to the high-pressure switch to control whether the carbon dioxide gas cylinder fills carbon dioxide gas into the mixing chamber.

[0033] The technical solution adopted by the present invention to solve the above second technical problem is: a control method for the soda water making device, characterized in that the control method includes the following steps:

[0034] (1), receiving a signal for making soda water;

[0035] (2), starting the water pump to pump drinking water from the water inlet channel into the mixing chamber;

[0036] (3), opening the high-pressure switch, and carbon dioxide gas enters the mixing chamber from the air inlet channel;

[0037] (4), opening the electromagnetic valve, and the water outlet end of the second liquid outlet connecting pipe receives soda water;

[0038] (5), receiving a signal to stop making soda water;

[0039] (6), first closing the water pump and the high-pressure switch, and then closing the electromagnetic valve.

[0040] Compared with the prior art, the advantages of the present invention are: in the soda water making device of the present invention, the air inlet channel is a side air inlet, and the area of the water flow channel opposite to it becomes the area where water and gas converge, that is, the mixing chamber. In this way, a separately provided large mixing chamber is avoided in terms of structure; the volume of the water-gas convergence area of the present invention is small, which can reduce the waste of carbon dioxide and improve the mixing efficiency when carbon dioxide and drinking water are mixed; and the small volume of the water-gas convergence area enables the water from the water inlet channel and the gas from the air inlet channel to converge and mix in the water-gas convergence area and then immediately flow out from the liquid outlet, realizing the immediate production of soda water while water is inlet and gas is inlet, and producing as much as consumed, without causing waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic structural diagram of the soda water making device in the embodiment of the present invention;

[0042] Figure 2 isFigure 1 Exploded view of the soda water making device shown

[0043] Figure 3 Cross-sectional view of the intake unit and the water intake unit connected together in the embodiment of the present invention

[0044] Figure 4 Cross-sectional view of the fine mixing pipe in the embodiment of the present invention

[0045] Figure 5 Partial cross-sectional schematic view of the intake unit in the embodiment of the present invention

[0046] Figure 6 Structural schematic view of the mixer in the embodiment of the present invention

[0047] Figure 7 Schematic diagram of the water flow of the soda water making device in the embodiment of the present invention

[0048] Figure 8 Control schematic diagram of the soda water making device in the embodiment of the present invention Detailed implementation manners

[0049] The present invention will be further described in detail below in conjunction with the embodiments with reference to the drawings

[0050] As Figures 1 to 8 shown, a preferred embodiment of the soda water making device of the present invention is provided. The soda water making device includes an intake unit 1, a water intake unit 2 connected to the upper part of the intake unit 1, a mixer 3 arranged in the intake unit 1, and a fine mixing pipe 4 connected to the bottom of the intake unit 1

[0051] Among them, the top of the intake unit 1 is open, the bottom has a bottom wall 131, and the interior is hollow to form a water flow channel 13, that is, the water flow channel 13 is surrounded by the peripheral wall and the bottom wall 131 of the intake unit 1. The top opening of the intake unit 1 serves as a water inlet 13a, and a liquid outlet 13b is opened on the bottom wall 131; in addition, an air intake channel 11 communicating with the water flow channel 13 is opened on the peripheral wall of the intake unit 1. The air intake end of the air intake channel 11 is in fluid communication with a carbon dioxide gas source, and the air outlet end 11a of the air intake channel 11 extends to the inner peripheral wall of the intake unit 1

[0052] The water intake unit 2 has a water pipe 22. The inner cavity of the water pipe 22 serves as a water intake channel 21. The water outlet 221 at the head of the water pipe 22 serves as the water outlet end of the entire water intake channel 21. The water intake end at the top of the water intake channel 21 is in fluid communication with a drinking water source, as Figure 2 、 3 shown

[0053] As Figure 3As shown, the head of the water pipe 22 extends downward from the water inlet 13a of the air inlet unit 1 into the water flow channel 13. The water outlet 221 of the head of the water pipe 22 is opposite to the liquid outlet 13b on the bottom wall 131 of the air inlet unit 1 with a gap therebetween, and the air outlet end 11a of the air inlet channel 11 faces this gap area. The water inlet 13a of the air inlet unit 1 is communicated with the water outlet 221 of the head of the water pipe 22. In this way, the water flowing out from the water outlet 221 of the water pipe 22 and the air flowing out from the air outlet end 11a of the air inlet channel 11 converge in this gap area and finally flow out from the liquid outlet 13b to produce the finished soda water. The cavity where this gap is located is the area for water-air convergence, denoted as the mixing cavity 14.

[0054] The mixer 3 is arranged in the mixing cavity 14, that is, the mixer 3 is arranged at a position within the water flow channel 13 and above the bottom wall 131. The mixer 3 includes an annular top wall 301, an inner ring wall 302 and an outer ring wall 303 that respectively extend downward from the inner edge and the outer edge of the annular top wall. The three together enclose an air guiding groove 32. Among them, the upper surface 3a of the annular top wall 301 abuts against the end face of the head of the water pipe 22, and the lower end face 3b of the inner ring wall 302 abuts against the bottom wall 131 of the water flow channel 13, so that the water outlet 221 of the water pipe 22 is communicated with the liquid outlet 13b on the bottom wall 131 of the water flow channel 13 through the central hole 31 surrounded by the inner ring wall 302. An air inlet hole 32a opposite to the air outlet end of the air inlet channel 11 is opened on the outer ring wall 303. At least two spaced shunt air holes 32b are circumferentially arranged on the inner ring wall 302, such as Figure 3 、 5 、6 shown.

[0055] During operation, the carbon dioxide gas entering from the air inlet channel 11 enters the air guiding groove 32 through the air inlet hole 32a, and then is dispersed into the shunt air holes 32b from the air guiding groove 32. The carbon dioxide gas intersects and mixes with the water flowing out from the water outlet 221 of the water pipe 22 at the central hole 31 (that is, the area defined by the inner ring wall 302 of the mixer 3). In this way, after the mixer 3 is installed in this embodiment, the inner ring wall 302 of the mixer 3, the corresponding bottom wall 131 of the water flow channel 13 and the end face of the head of the water pipe 22 together define the mixing cavity 14 of this embodiment.

[0056] In addition, the water outlet 221 of the water pipe 22 is arranged at the center of the end face of the head of the water pipe 22. The water outlet 221 of the water pipe 22 protrudes downward into the mixing cavity 14 and is opposite to the liquid outlet 13b on the bottom wall 131 of the water flow channel 13, such as Figure 3 shown.

[0057] To prevent the mixer 3 from moving relative to the water flow channel 13, so as to ensure that the air outlet end of the air inlet channel on the water flow channel is always in communication with the air inlet hole 32a on the mixer, the outer ring wall 303 of the mixer 3 is in contact with the inner peripheral wall of the water flow channel 13 of the air inlet unit 1. And, a protruding positioning block 15 is provided on the inner peripheral wall of the water flow channel 13, and a positioning groove 33 for accommodating the positioning block 15 is provided at a corresponding position on the outer ring wall 303 of the mixer 3, as Figure 5 , 6 shown.

[0058] To enhance the sealing performance of the mixing chamber, the water inlet unit 2 and the air inlet unit 1 are connected by threads, and there are specifically two connection methods. One is that the outer wall of the water pipe 22 of the water inlet unit 2 is provided with an external thread, and the inner wall of the water flow channel 13 of the air inlet unit 1 is provided with an internal thread at a corresponding position, and the two are connected by threads (not shown in the figure). The other is that the water inlet unit 2 is provided with an annular wall 23 connected thereto around the water pipe 22, and is sleeved outside the outer wall of the water flow channel 13 of the air inlet unit 1, and the inner peripheral wall of the annular wall 23 is provided with an internal thread, and the outer wall of the water flow channel 13 of the air inlet unit 1 is provided with an external thread, and the two are connected by threads, as Figure 3 shown.

[0059] Along the water inlet direction of the water inlet channel 21, the aperture of the water inlet channel 21 gradually decreases from large to small, and successively includes a large-diameter section, a transition section, and a small-diameter section. The aperture range of the transition section is 1.5 to 2.0 mm, and the value in this embodiment is 1.8 mm. Along the liquid flow direction, the aperture of the liquid outlet 13b penetrating the bottom wall 131 of the water flow channel 13 first decreases from large to small and then increases from small to large, which are the first large-diameter part 16, the second small-diameter part 17, and the third large-diameter part 18 respectively. The second small-diameter part 17 serves as a pressure-maintaining throttle hole, and the aperture range of the pressure-maintaining throttle hole is 0.7 to 1.0 mm, and the value in this embodiment is 0.8 mm. And the third large-diameter part 18 continues to protrude outward from the bottom wall 131 to become the first liquid outlet connecting pipe 12 for discharging the made soda water, as Figure 5 shown.

[0060] As Figure 4 shown, the fine mixing pipe 4 is connected to the first liquid outlet connecting pipe 12 of the air inlet unit 1. The fine mixing pipe 4 is in a long strip shape and has a hollow fine mixing chamber 4a inside. In this embodiment, the volume of the internal fine mixing chamber 4a is not greater than 0.2 liters. The bottom of the fine mixing pipe 4 is provided with a second liquid outlet connecting pipe 41 communicating with the fine mixing chamber 4a. The second liquid outlet connecting pipe 41 and the fine mixing chamber 4a are communicated through a flow-limiting hole 42 opened on the fine mixing pipe 4. The aperture range of the flow-limiting hole 42 is 0.7 to 1.0 mm, and the value in this embodiment is 0.8 mm.

[0061] As Figure 7 , 8As shown in the figure, the soda water making device further includes a controller 601, and an electromagnetic valve 602 is provided on the pipeline connected to the second liquid outlet connecting pipe 41. The controller 601 is used to control the opening and closing of the electromagnetic valve 602. A water pump 603 is provided on the pipeline connecting the drinking water source and the water inlet channel 21, and a first check valve 604 is provided on the pipeline connecting the water pump 603 and the water inlet channel 21; the controller 601 is electrically connected to the water pump 603 to control whether the water pump 603 pumps drinking water into the mixing chamber 14; the carbon dioxide gas source is a carbon dioxide gas cylinder 605, and a high-pressure switch 606 is provided on the pipeline connecting the outlet of the carbon dioxide gas cylinder 605 and the air inlet channel 11. A pressure reducing valve 607 is provided on the pipeline connecting the outlet of the carbon dioxide gas cylinder 605 and the high-pressure switch 606, and a pressure relief valve 608 is provided on the pipeline connecting the pressure reducing valve 607 and the high-pressure switch 606. A second check valve 609 is provided on the pipeline connecting the high-pressure switch 606 and the air inlet channel 11; the controller 601 is electrically connected to the high-pressure switch 606 to control whether the carbon dioxide gas cylinder 605 fills the mixing chamber 14 with carbon dioxide gas.

[0062] The present invention also protects a control method for a soda water making device, and the control method includes the following steps:

[0063] (1) Receiving a signal for making soda water;

[0064] (2) Starting the water pump 603 to pump drinking water into the mixing chamber 14 from the water inlet channel 21;

[0065] (3) Opening the high-pressure switch 606, and carbon dioxide gas enters the mixing chamber 14 from the air inlet channel 11;

[0066] (4) Opening the electromagnetic valve 602, and the water outlet end of the second liquid outlet connecting pipe 41 receives soda water;

[0067] (5) Receiving a signal to stop making soda water;

[0068] (6) First closing the water pump 603 and the high-pressure switch 606, and then closing the electromagnetic valve 602.

[0069] As used herein, "fluid communication" refers to the spatial relationship between two components or parts (hereinafter uniformly referred to as the first part and the second part respectively), that is, fluid (gas, liquid or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. It can be that the first part and the second part are directly connected, or the first part and the second part are indirectly connected through at least one third party. The third party can be a fluid passage such as a pipe, a channel, a conduit, a flow guide, a hole, a groove, etc., or a chamber that allows fluid to flow through, or a combination of the above.

Claims

1. A soda water making device, comprising: An air intake unit (1) having an air intake passage (11), the air intake end of the air intake passage (11) being used for fluid communication with a carbon dioxide gas source; A water intake unit (2) having a water intake passage (21), the water intake end of the water intake passage (21) being used for fluid communication with a drinking water source; It is characterized in that The air intake unit (1) further has a hollow water flow passage (13), the two ends of the water flow passage (13) being an inlet (13a) and an outlet (13b) respectively, wherein: The inlet (13a) is connected to the outlet end of the water intake passage (21) of the water intake unit (2), and the air intake passage (11) penetrates the water flow passage (13) laterally, and the area where water and gas converge in the water flow passage (13) is denoted as a mixing chamber (14); And the outlet (13b) is used for flowing out the made soda water.

2. The soda water making device according to claim 1, characterized in that, The water intake unit (2) has a water pipe (22), the inner cavity of the water pipe (22) being the water intake passage (21), and the head of the water pipe (22) extends into the inlet (13a) of the water flow passage (13) of the air intake unit (1); the water outlet (221) at the head of the water pipe (22) is the outlet end of the entire water intake passage (21), and is opposite to and has a gap with the outlet (13b) of the water flow passage (13) of the air intake unit (1), and the penetration part of the air intake passage (11) and the water flow passage (13) is located within this gap, and the cavity where this gap is located is the mixing chamber (14).

3. The soda water making device according to claim 2, characterized in that, The outlet (13b) on the water flow passage (13) is opened on the bottom wall (131) of the water flow passage (13), and the air intake passage (11) is arranged adjacent to the bottom wall (131); A mixer (3) is arranged in the water flow passage (13) and above the bottom wall (131) of the water flow passage (13), comprising: An annular top wall (301) and an inner ring wall (302) and an outer ring wall (303) respectively extending downward from the inner edge and the outer edge of the annular top wall, the three jointly enclosing a gas guiding groove (32), wherein, The upper surface (3a) of the annular top wall (301) abuts against the end face of the head of the water pipe (22), and the lower end face (3b) of the inner ring wall (302) abuts against the bottom wall (131) of the water flow passage (13), so that the water outlet (221) of the water pipe (22) is communicated with the outlet (13b) on the bottom wall (131) of the water flow passage (13) through the central hole (31) formed by the inner ring wall (302); An air intake hole (32a) opposite to the air outlet end of the air intake passage (11) is opened on the outer ring wall (303); At least two spaced diversion air holes (32b) are circumferentially opened on the inner ring wall (302); The inner ring wall (302) of the mixer (3), the bottom wall (131) of the corresponding water flow passage (13), and the end face of the head of the water pipe (22) jointly define the mixing chamber (14).

4. The soda water making device according to claim 3, characterized in that, The water outlet (221) of the water pipe (22) is arranged at the center of the end face of the head of the water pipe (22), and protrudes downward into the mixing chamber (14), opposite to the liquid outlet (13b) on the bottom wall (131) of the water flow channel (13).

5. The soda water making device according to claim 3, characterized in that, The outer ring wall (303) of the mixer (3) is attached to the inner peripheral wall of the water flow channel (13) of the air inlet unit (1). And, a protruding positioning block (15) is provided on the inner peripheral wall of the water flow channel (13), and a positioning groove (33) for accommodating the positioning block (15) is provided at the corresponding position on the outer ring wall (303) of the mixer (3).

6. The soda water making device according to any one of claims 2 to 5, characterized in that, The outer wall of the water pipe (22) of the water inlet unit (2) is provided with an external thread, and the inner wall of the water flow channel (13) of the air inlet unit (1) is provided with an internal thread at the corresponding position, and the two are threadedly connected.

7. The soda water making device according to any one of claims 2 to 5, characterized in that The water inlet unit (2) is provided with an annular wall (23) connected thereto around the water pipe (22), and is sleeved outside the outer wall of the water flow channel (13) of the air inlet unit (1). And, an internal thread is provided on the inner peripheral wall of the annular wall (23), and an external thread is provided on the outer wall of the water flow channel (13) of the air inlet unit (1), and the two are threadedly connected.

8. The soda water making device according to claim 3, 4 or 5, characterized in that, Along the liquid flow direction, the caliber of the liquid outlet (13b) penetrating the bottom wall (131) of the water flow channel (13) first decreases from large to small and then increases from small to large, which are the first large diameter part (16), the second small diameter part (17), and the third large diameter part (18) respectively. The second small diameter part (17) is used as the pressure maintaining throttle orifice.

9. The soda water making device according to claim 8, wherein, The aperture range of the pressure maintaining throttle orifice is 0.7 to 1.0 millimeters.

10. The soda water making device according to claim 8, characterized in that, The third large diameter part (18) continues to protrude and extend outward from the bottom wall (131) to form a first liquid outlet connecting pipe (12) for flowing out the made soda water.

11. The soda water making device according to claim 10, characterized in that, The first liquid outlet connecting pipe (12) is connected to a fine mixing pipe with a fine mixing chamber (4); the fine mixing chamber (4) is provided with a second liquid outlet connecting pipe (41), and the second liquid outlet connecting pipe (41) is communicated with the fine mixing chamber (4) through a flow limiting hole (42) opened on the chamber wall of the fine mixing chamber (4).

12. The soda water making device according to claim 11, characterized in that, The aperture range of the flow limiting hole (42) is 0.7 to 1.0 millimeters.

13. According to the soda water making device described in claim 11, the fine mixing pipe is in a long strip shape, and the volume of its fine mixing chamber (4) is not greater than 0.2 liters.

14. The soda water making device according to claim 11, wherein, Along the water inlet direction of the water inlet channel (21), the aperture of the water inlet channel (21) decreases from large to small, and successively includes a large diameter section, a transition section, and a small diameter section. The aperture range of the transition section is 1.5 to 2.0 millimeters.

15. The soda water making device according to claim 11, characterized in that, It further includes a controller (601), and an electromagnetic valve (602) is provided on the pipeline connected to the second liquid outlet connecting pipe (41). The controller (601) is used to control the opening and closing of the electromagnetic valve (602).

16. The soda water making device according to claim 15, characterized in that, A water pump (603) is provided on the connecting pipeline between the drinking water source and the water inlet channel (21). The controller (601) is electrically connected to the water pump (603) to control whether the water pump (603) pumps drinking water into the mixing chamber (14). The carbon dioxide gas source is a carbon dioxide gas cylinder (605). A high-pressure switch (606) is provided on the connecting pipeline between the outlet of the carbon dioxide gas cylinder (605) and the intake passage (11). The controller (601) is electrically connected to the high-pressure switch (606) to control whether the carbon dioxide gas cylinder (605) fills the mixing chamber (14) with carbon dioxide gas.

17. The control method of the soda water making device according to claim 16, characterized in that, The control method includes the following steps: (1) Receive a signal for making soda water. (2) Start the water pump (603) to pump drinking water into the mixing chamber (14) from the water inlet passage (21). (3) Open the high-pressure switch (606) so that carbon dioxide gas enters the mixing chamber (14) from the intake passage (11). (4) Open the solenoid valve (602), and the water outlet end of the second liquid outlet connecting pipe (41) receives soda water. (5) Receive a signal to stop making soda water. (6) First close the water pump (603) and the high-pressure switch (606), and then close the solenoid valve (602).

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