JP5716240B2 - Carbonated spring manufacturing equipment - Google Patents

Description

  The present invention relates to a carbonated spring manufacturing apparatus that can be used as a shower for washing hair and scalp.

  It has long been known that hot springs containing carbon dioxide (hereinafter simply referred to as carbonated springs) have a high thermal insulation effect. This heat retention effect is because the blood circulation of the skin is improved by the action of dilating the capillaries with carbon dioxide.

  In addition, when carbonated springs with weakly acidic properties are used as a shower for washing hair, scalp, etc., they have a rinsing effect on hair damaged by alkaline shampoo solution, perm solution, etc., and oil and fat accumulated in the pores of the scalp. It also has an excellent effect in removing components and keratin components.

  Patent Document 1 discloses a technique of using a hollow fiber membrane to artificially produce a carbonated spring by dissolving carbon dioxide in warm water and using it as a shower for washing hair and scalp. If this technique is used, a small carbonated spring manufacturing apparatus can be provided, so that it can also be used for home use.

  In addition, by fitting a specially shaped joint into the hot / cold water mixer tap installed in the bathroom or bathtub, the hot / cold water mixer tap and the carbonated spring production device can be connected, allowing the entire device to be connected. Patent Document 2 discloses a technique for further reducing the size of the above.

  In addition, the carbonated spring manufacturing apparatus for showers as described above is generally called a one-pass type, and is portable and can be used not only in the bathroom but also in the bathroom. is there. Therefore, it is an important technical problem to further reduce the size of the entire apparatus. That is, the main use of the carbonated spring production apparatus according to the present invention is not intended to be used in a state where it is installed and fixed for a bathtub.

JP-A-8-19784 Registered Utility Model No. 3143176

  It is known that the above-described heat retention effect by the carbonated spring has a superior effect as the concentration of carbon dioxide dissolved in the carbonated spring is higher. However, when the carbonated spring manufacturing apparatus of Patent Document 1 or Patent Document 2 described above is used, only carbonated springs having a carbon dioxide gas concentration of about 500 ppm can be manufactured as described in Patent Document 1, for example. In addition, it is known that the density | concentration of the saturated carbon dioxide gas in 1 atmosphere and about 40 degreeC warm water is about 1100 ppm.

  Moreover, the carbonated spring manufacturing apparatus of patent document 1 uses the hollow fiber membrane for the melt | dissolution part of a carbon dioxide gas. And the part of a hollow fiber membrane is clogged with progress of use time by garbage, such as scale contained in warm water, As a result, the density | concentration of the carbon dioxide gas melt | dissolved in carbonated spring falls gradually. Therefore, there is a trouble in maintenance that the part of the hollow fiber membrane which is the dissolving part of carbon dioxide gas has to be frequently replaced.

  An object of the present invention is to provide a carbonated spring manufacturing apparatus that is compact and portable, can increase the concentration of carbon dioxide dissolved in the carbonated spring, and can be easily maintained.

The present invention aims to solve the above problems, and the invention described in claim 1
Supplying carbon dioxide to the warm water to produce a mixture of the warm water and the carbon dioxide;
In the carbonated spring production apparatus for producing the carbonated carbonate via a flexible tube having bellows-like irregularities, a carbonated spring tube, and a shower head having a joint ,
The flexible tube has a plurality of bent portions,
The shower head part is
The carbonated spring is discharged from the water outlet through a disk-shaped reduced diameter piece having a plurality of through-holes and a venturi tube having a cross-sectional area at the center smaller than that at both ends. Is,
The reduced diameter piece is
The cross-sectional area of the plurality of through holes is reduced to about 1/3 to 1/5 of the cross-sectional area of the carbonated spring tube,
Each of the through holes is formed so as to face a direction extending 5 to 30 degrees in the outer circumferential direction .

The invention described in claim 2 is the invention described in claim 1,
The flexible tube has three or more bent portions.

The invention according to claim 3 is the invention according to claim 1 or 2 ,
The joint portion and the venturi tube are manufactured integrally.

  When the one-pass type carbonated spring manufacturing apparatus used for showers according to the present invention is used, the concentration of carbon dioxide gas dissolved in the carbonated spring can be made extremely high while being compact.

  When the carbonated spring with weak acidity produced by this carbonated spring production device is used as a shower for washing hair, scalp, etc., it has the effect of rinsing hair damaged by alkaline shampoo solution or perm solution, etc. It also has an excellent effect in removing oily and fat components and keratinous components accumulated in.

  Moreover, the carbonated spring manufacturing apparatus according to the present invention is easy to perform maintenance work and has high efficiency of dissolving carbon dioxide gas in warm water, so that the consumption of carbon dioxide gas filled in the carbon dioxide gas cylinder is small.

  In addition, the carbonated spring manufacturing apparatus of the present invention has a simple structure and a small number of parts, so that it can be manufactured at a low price.

It is the schematic of the carbonated spring manufacturing apparatus concerning this invention. It is the schematic of the internal structure of a main-body part. It is the schematic of a shower head part. It is sectional drawing of a shower head part.

              a) It is an internal structure figure of a shower head part.

b) It is explanatory drawing which paid its attention to the carbonated spring which flows through a shower head part.
It is sectional drawing of a shower head part.

              a) It is the schematic of four through-holes which face the direction which spreads in the circumferential direction.

              b) It is explanatory drawing which paid its attention to the carbonated spring which flows through a shower head part.

  Hereinafter, an embodiment of the carbonated spring manufacturing apparatus 100 according to the present invention will be described in detail with reference to FIGS.

1. 1 is a schematic diagram of a carbonated spring manufacturing apparatus 100 for a shower according to the present invention. The carbonated spring manufacturing apparatus 100 includes a main body portion 21, a shower head portion 31, and other accessories.

  That is, the carbonated spring manufacturing apparatus 100 supplies carbon dioxide to warm water to generate a mixture of warm water and carbon dioxide, and the mixture passes through a flexible tube having bellows-like irregularities, a carbonated spring tube, and a shower head unit. To produce carbonated springs. And this carbonated spring manufacturing apparatus 100 has the characteristics in the installation structure of the flexible tube 9 of the main-body part 21, and the internal structure of the shower head part 31, so that it may mention later.

  The high-pressure carbon dioxide gas filled in the carbon dioxide gas cylinder 1 is supplied to the joint 13 a of the main body portion 21 via the regulator 2 and the flow rate regulator 3. Although omitted in FIG. 1, a flow meter can be provided between the flow rate regulator 3 and the joint 13a in order to measure the accurate flow rate of carbon dioxide.

  Hot water from the hot water outlet 6 such as a faucet is supplied to the joint 13b of the main body 21 as it is. Although omitted in FIG. 1, in order to measure an accurate flow rate of hot water (for example, about 2 to 5 liters / minute is preferable), a flow meter is placed between the hot water outlet 6 and the joint 13b. It can also be provided.

  In the main body 31, hot water from the joint 13 b is supplied to the T-shaped joint 8 via the hot water flow meter 7 and the reverse branch valve 5 b. When the flow rate of hot water exceeds a certain value, for example, exceeds about 3 liters / minute, the hot water flow meter 7 automatically sends a signal for opening the electromagnetic valve 4 for supplying carbon dioxide gas.

  Here, since the reverse support valve 5b is installed between the hot water flow meter 7 and the T-shaped joint 8, the carbon dioxide gas from the carbon dioxide gas cylinder 1 flows back to the hot water flow meter 7 or the like even if there is any abnormal situation. There is nothing wrong.

  Carbon dioxide gas from the joint 13a is supplied to the T-shaped joint 8 through the electromagnetic valve 4 and the reverse support valve 5a. In addition, since the reversely supported valve 5a is installed between the electromagnetic valve 4 and the T-shaped joint 8, hot water does not flow back to the electromagnetic valve 4 or the like even if there is any abnormal situation.

  Carbon dioxide gas merges into the warm water at the T-joint 8 portion. In the vicinity of the merged portion, the hot water and the carbon dioxide in the form of bubbles are mixed, and the carbon dioxide is hardly dissolved in the warm water. Hereinafter, this state is referred to as a mixture of warm water and carbon dioxide gas.

  The mixture of warm water and carbon dioxide gas is partly dissolved in warm water by passing through the flexible tube 9 having bellows-like irregularities. At this stage, since part of the carbon dioxide gas has already been dissolved in the warm water, the warm water that has passed through the flexible tube 9 will be simply referred to as a carbonated spring.

  The carbonated spring that has passed through the flexible tube 9 reaches the joint 13 c of the main body 21. Since the flexible tube 9 having the bellows-like irregularities in the main body 21 has a characteristic installation structure, details of the installation structure will be described later.

  The carbonated spring from the joint 13c can be freely bent and used, and is supplied to the shower head unit 31 via a commercially available resinous carbonated spring tube 10. As will be described later, the shower head portion 31 has an internal structure in which the concentration of carbon dioxide dissolved in the carbonated spring can be further increased. The details of the internal structure of the shower head unit 31 will be described later.

2. Installation Structure of Flexible Tube 9 An outline of an installation structure of the flexible tube 9 according to the present invention installed in the main body 21 is shown in FIG. The main body 21 has a rectangular parallelepiped shape, and its outer dimensions are compact, with vertical and horizontal dimensions of about 200 mm and height of about 100 mm, respectively. The flexible tube 9 has a bellows shape in which thick portions and thin portions (uneven portions) having an outer diameter are alternately formed. The flexible tube 9 is a commercially available stainless steel product having a thick outer diameter of about 16 mm, a thin portion of about 13 mm, each formed at a pitch of about 5 mm, a plate thickness of about 0.6 mm, and a total length of the tube of about 750 mm. The product was used.

  According to detailed experiments by the inventor, the longer the total length of the flexible tube 9 is, the more the number of bent portions (folded portions 23a to 23e in FIG. 2) increases in the case of the same total length. It became clear that it was easy.

  Further, during the production of the carbonated spring, it was possible to visually observe that the flexible tube 9 vibrates more vigorously as the number of bent portions increases. The reason for this is that the carbon dioxide gas in the form of bubbles in the hot water collides with the inner wall portion of the flexible tube 9 having the bellows-like irregularities, and is shocked, stirred by the shock, refined, and heated into the warm water. This is thought to be because it is easily dissolved. And it is considered that the carbon dioxide gas in the form of bubbles in the warm water collides with the side wall portion more vigorously as the number of bent portions is larger, and is being stirred.

  Here, it was found that when the number of bent portions of the flexible tube 9 is 3 or more, more preferably 5 or more, the carbon dioxide gas is easily dissolved in warm water. In view of the limited outer dimensions of the main body 1 and the cost, etc., in this embodiment, four portions are provided as the bent portions of approximately 90 degrees (folded portions 23a to 23d), and are folded back to approximately 180 degrees. A total of five bent portions, ie, one bent portion (folded portion 23e), were provided as the bent portions (Fig. 2).

3. Structure of Shower Head Unit 31 The structure of the shower head unit 31 according to the present invention will be described in detail with reference to FIGS. As described above, the carbonated spring from the joint 13c of the main body 21 is supplied to the shower head unit 31 via the commercially available carbonated spring tube 10 (FIG. 3).

  The shower head unit 31 is composed of a reduced diameter piece 35, a joint part 34 for connecting to the carbonated spring tube 10, a handle 33 for facilitating the user to hold, a water outlet 32 for discharging the carbonated spring, and the like. (Fig. 3).

  The disk-shaped reduced diameter piece 35 was manufactured by molding a plastic resin, for example, a nylon resin. The handle 33 of the shower head unit 31 is made of rubber that is easy to grip by the user and is durable, for example, ABS.

  The joint portion 34 and the venturi tube 37 inside the handle 33 portion are integrally formed of a plastic resin, for example, a nylon resin, so as to form the venturi portion 41 (FIG. 4A). By manufacturing the joint portion 34 and the venturi tube 37 in an integrated state, the venturi portion 41 can be manufactured at a low price.

  The carbonated spring that has passed through the venturi pipe 37 is discharged to the outside from the water outlet 32 via the tip portion 38 that is formed of plastic resin, for example, nylon resin. Here, since the user can easily grasp the handle 33 of the shower head portion 31 by using the tip portion 38 bent in a substantially right angle direction, the hair or scalp can be washed by himself / herself. (FIG. 4A).

  The carbonated spring from the carbonated spring tube 10 first enters the joint portion 34 and the venturi pipe 37 after passing through the diameter-reduced pieces 35 and 35a (FIGS. 4A, 4B, and 5B). The reduced-diameter pieces 35 and 35a have a disk shape, and the outer diameter thereof is substantially the same as the outer dimension of the joint portion 34, and a plurality of through-holes having the same shape on the inner side, for example, four Through-holes 36 and 36a are opened (FIGS. 3, 4A, and 5A). Here, in order to obtain a high-concentration carbonated spring, it was found that it is preferable to provide a plurality of through holes 36, 36a in the diameter-reduced pieces 35, 35a, particularly four or more.

  As a present Example, the cross-sectional area which the carbonated spring can pass in the part of the through-holes 36 and 36a of the diameter-reduction pieces 35 and 35a is 1/3 to 1/5 of the cross-sectional area which the carbonated spring can pass in the part of the carbonated spring tube 10. Reduced to a certain extent. Therefore, the flow rate of the carbonated spring passing through the through holes 36 and 36a of the reduced diameter pieces 35 and 35a is about 3 to 5 times higher than the flow rate of the carbonated spring passing through the carbonated spring tube 10 upstream of that. (Fig. 4 (b), Fig. 5 (b)).

  Accordingly, in the vicinity of the through holes 36, 36a of the diameter-reduced pieces 35, 35a (hereinafter referred to as the diameter-reduced portion 42. FIGS. 4 (b) and 5 (b)), a so-called cavitation phenomenon occurs, and the carbonate spring is disturbed. A flow occurs. And, due to the turbulent flow of the carbonated spring, relatively large carbon dioxide bubbles are sheared to generate countless fine bubbles. In addition, because they are vigorously stirred, the fine bubbles of carbon dioxide can easily dissolve in the carbonated spring.

  When the apparatus for producing carbonated spring of the present invention was actually operated, it was observed that relatively loud sounds and vibrations that seem to be due to cavitation were generated in the vicinity of the reduced diameter portion 42 of the shower head portion 31.

  Here, the shape of the plurality of through holes 36, 36a provided in the disk-shaped diameter-reduced pieces 35, 35a is larger than that formed in parallel to the central axis direction (through hole 36: FIG. 4 ( a), (b)), each of which is formed so as to face the direction of spreading in the circumferential direction (through hole 36a: FIGS. 5A and 5B), a high concentration carbonated spring can be obtained. I understood.

  Therefore, as shown in FIG. 5 (a), each of the four through holes 36a is oriented in a direction extending in the circumferential direction of about 5 to 30 degrees, for example, about 10 degrees in the circumferential direction. Formed as follows. In FIG. 5, in order to facilitate understanding of the drawing, it is described so as to face the direction spreading outward at an angle larger than about 10 degrees.

  Near the entrance of the venturi section 41, the flow path of the carbonated spring 11 that has passed through the through hole 36a is bent outward in the circumferential direction, and collides violently with the inner wall surface portion to generate a collision section 43 that is agitated. (FIG. 5B). It is considered that the carbonated spring having a high concentration as described later is obtained by the occurrence of the collision portion 43 (FIG. 5B).

  The carbonated spring enters the inlet side of the venturi portion 41 having a larger cross-sectional area than the cross-sectional area of the through hole 36 of the reduced diameter portion 42 (FIGS. 4B and 5B). The venturi portion 41 is configured by a venturi tube 37 having a structure in which the cross-sectional area of the central portion is narrower than the cross-sectional area of both end portions (FIGS. 4B and 5B). And the cross-sectional area of the both ends of the venturi pipe 37 was made larger than the cross-sectional area of the through-holes 36 and 36a.

  That is, the carbonated spring accelerated by the reduced diameter portion 42 is largely decelerated near the entrance of the venturi portion 41 and then accelerated near the center of the venturi portion 41. Accordingly, even in the vicinity of the center of the venturi portion 41, the relatively large bubbles of carbon dioxide gas are sheared or crushed to generate countless fine bubbles.

  Thereafter, the carbonated spring is decelerated again in the vicinity of the outlet of the venturi portion 41 and is discharged to the outside from the spout 32 having substantially the same cross-sectional area as that of the venturi portion 41 in the vicinity of the outlet, such as the hair and scalp. Used as a washing shower (FIGS. 4B and 5B).

  Here, according to Bernoulli's theorem, it is known that the pressure in the liquid decreases as the flow rate of the liquid increases, and conversely, the pressure in the liquid increases as the flow rate of the liquid decreases. Then, the higher the pressure in the liquid, the higher the saturation solubility of the carbon dioxide gas, and the lower the pressure in the liquid, the lower the saturation solubility of the carbon dioxide gas.

  As described above, since the cross-sectional area in the vicinity of the water discharge port 32 is substantially the same as the cross-sectional dimension in the vicinity of the outlet of the venturi portion 41, the flow rate of the carbonated spring is decelerated, and the pressure in the carbonated spring is inversely proportional to it. Therefore, the concentration of carbon dioxide gas that can be dissolved in the carbonated spring can be increased.

  That is, in the shower head portion 31, a combined effect of the cavitation effect due to the reduced diameter piece 35 and the venturi effect due to the venturi tube 37 occurs, so that countless fine carbon dioxide bubbles are generated, and carbon dioxide in the carbon dioxide spring Dissolution is further accelerated. And if this invention is used, the carbonated spring in which the high concentration carbon dioxide gas which is mentioned later is melt | dissolved can be manufactured.

  Below, one Example about the case where carbonated spring is manufactured from warm water and a carbon dioxide gas using the carbonated spring manufacturing apparatus 100 concerning this invention is described (FIGS. 1-5).

  The cock that is the main stopper of the carbon dioxide gas cylinder 1 is opened (however, the cock of the main stopper is not shown), and the secondary pressure of the regulator 2 is adjusted to 0.18 ± 0.02 MPa, for example, about 0.18 MPa. Next, the valve of the carbon dioxide flow rate regulator 3 is opened in advance by twisting about 1/6 turn (FIG. 1).

  Since the warm water from the warm water outlet 6 is not supplied to the warm water flow meter 7 in the main body 21, the electromagnetic valve 4 remains closed. Therefore, in this state, the carbon dioxide gas filled in the carbon dioxide gas cylinder 1 is not supplied to the T-shaped joint 8 (FIG. 1).

  Next, warm water, for example, warm water of about 40 ° C., is supplied from the warm water outlet 6 such as a water heater (not shown) to the joint 13 b of the main body 21. Then, the valve of the hot water outlet 6 is gradually opened, and the flow rate of the hot water from the hot water outlet 6 is gradually increased. When the hot water flow meter 7 of the main body 21 determines that the flow rate of hot water has exceeded 3 liters / minute, the electromagnetic valve 4 for automatically supplying carbon dioxide gas is opened (FIG. 1).

  When the solenoid valve 4 is opened, the carbon dioxide gas filled in the carbon dioxide gas cylinder 1 flows into the T-shaped joint 8. Then, considering the variation of the hot water flow rate (pressure), the valve is twisted further than the position of the valve of the hot water outlet 6 in the state where the solenoid valve 4 is opened, for example, about 1/6 rotation, extra hot water outlet. 6 is twisted (FIG. 1).

  In the T-shaped joint 8, carbon dioxide gas is supplied into warm water and joins each other. In the portion of the T-shaped joint 8, a state in which carbon dioxide is mixed in the hot water in the form of bubbles, that is, a so-called mixture of warm water and carbon dioxide, flows into the flexible tube 9 as it is (FIG. 1).

  The mixture of warm water and carbon dioxide gas reaches the joint 13c via the flexible tube 9 having the bellows-like irregularities and the five bent portions 23a to 23e (FIG. 2). In this state, it was observed that the flexible tube 9 vibrates little by little. This is probably because the mixture of warm water and carbon dioxide gas is vigorously colliding with the inner wall of the flexible tube 9 and stirred.

  The mixture of warm water and carbon dioxide passes through the flexible tube 9 having a plurality of bent portions 23a to 23e, so that the bubbles of carbon dioxide in the warm water are refined and part of the carbon dioxide dissolves in the warm water. It becomes carbonated spring (Fig. 2).

  The carbonated spring from the joint 13c of the main body 1 is supplied to the shower head unit 31 via the carbonated spring tube 10 that can be bent and used by the user (FIG. 3). The shower head portion 31 has a disk-shaped reduced diameter piece 35 and a venturi tube 37 so that the carbonated spring passes in this order (FIGS. 4A, 4B, 5A). b)). In the shower head unit 31, since the combined effect of the cavitation effect and the venturi effect occurs as described above, the dissolution of carbon dioxide into the carbonated spring is further accelerated.

  Here, as shown in FIGS. 4A and 4B and FIGS. 5A and 5B, the venturi tube 37 is preferably passed through the diameter-reduced pieces 35 and 35a. It was found that a carbonated spring with a more stable carbon dioxide gas concentration was obtained than when the reduced diameter pieces 35 and 35a were passed through the tube 37.

  Although the detailed reason for this phenomenon is not clear, it is less likely that variations in the generation of fine bubbles will occur if the venturi effect is caused by the venturi tube 37 after the cavitation effect caused by the diameter-reducing pieces 35 and 35a in advance. This is considered to be due to the remarkable effects obtained by combining the respective effects.

  As one embodiment, a carbonated spring is manufactured using the carbonated spring manufacturing apparatus 100 according to the present invention having a reduced diameter piece 35a having a shape as shown in FIGS. The concentration of carbon dioxide dissolved in the solution was measured. The concentration of carbon dioxide in the carbonated spring was measured by the method prescribed in JIS-K-0101-25.2 by requesting the analysis from Kumagaya Analysis Center. As a result, when the carbonated spring production apparatus according to the present invention was used, a carbonated spring having an extremely high concentration of about 1100 ppm of carbon dioxide gas could be obtained.

  As described above, when the one-pass type carbonated spring manufacturing apparatus according to the present invention is used, it is compact and portable, and the concentration of carbon dioxide dissolved in the carbonated spring can be extremely increased.

  When this carbonated spring is used as a shower for washing hair, it has a rinsing effect on hair damaged by an alkaline shampoo solution or perm solution. Carbonate springs also have an excellent effect in removing oily and keratinous components accumulated in the pores of the scalp and promote blood circulation of the scalp.

  In addition, the carbonated spring manufacturing apparatus according to the present invention has high efficiency of dissolving carbon dioxide gas in warm water, and therefore the consumption of carbon dioxide gas filled in the carbon dioxide gas cylinder is small. In addition, the carbonated spring manufacturing apparatus of the present invention has a simple structure, is easy to perform maintenance work, and has a small number of parts, so that it can be manufactured at a low price.

  In a normal use situation, in order to reduce the consumption of carbon dioxide, the white turbidity of the carbonated spring from the water outlet 32 is relatively small. For example, as described above, the valve of the carbon dioxide flow rate regulator 3 is 1/6. It is preferable to use it in a state where it is twisted and opened. On the other hand, for a user who prefers a carbonated spring containing a low concentration of carbon dioxide, the valve of the carbon dioxide gas flow rate regulator 3 can be further narrowed down.

  Depending on the user's preference, the secondary pressure of the regulator 2 is increased and set to about 0.20 MPa, or the valve of the carbon dioxide gas flow rate regulator 3 is further opened to increase the flow rate of hot water. On the other hand, a larger amount of carbon dioxide can be supplied. By supplying a large amount of carbon dioxide, a large amount of fine bubbles of carbon dioxide in a cloudy state can be generated in the carbonated spring, so that the scalp massage effect at the time of shower can be increased.

  INDUSTRIAL APPLICABILITY The present invention can be used for a one-pass type carbonated spring manufacturing apparatus that can be used as a shower for washing hair or scalp.

DESCRIPTION OF SYMBOLS 1 Carbon dioxide gas cylinder 2 Regulator 3 Flow regulator 4 Solenoid valve 5a, 5b Check valve 6 Hot water outlet 7 Hot water flow meter 8 T type joint 9 Flexible tube 10 Carbon spring tube 11 Carbon spring 13a, b, c Joint 21 Main body 22 Carbon dioxide gas supply Pipe 23a, b, c, d, e Bent part 31 Shower head part 32 Water outlet 33 Handle 34 Joint part 35 Reduced diameter piece 35a Reduced diameter piece 36 Through hole 36a Through hole 37 Venturi pipe 38 Tip 41 Venturi part 42 Diameter part 43 Colliding part 100 Carbonated spring manufacturing equipment

Claims (3)

Supplying carbon dioxide to the warm water to produce a mixture of the warm water and the carbon dioxide;
In the carbonated spring production apparatus for producing the carbonated carbonate via a flexible tube having bellows-like irregularities, a carbonated spring tube, and a shower head having a joint ,
The flexible tube has a plurality of bent portions,
The shower head part is
The carbonated spring is discharged from the water outlet through a disk-shaped reduced diameter piece having a plurality of through-holes and a venturi tube having a cross-sectional area at the center smaller than that at both ends. Is,
The reduced diameter piece is
The cross-sectional area of the plurality of through holes is reduced to about 1/3 to 1/5 of the cross-sectional area of the carbonated spring tube,
Each of the through holes is formed so as to face a direction extending 5 to 30 degrees in the outer circumferential direction . The carbonated spring manufacturing apparatus according to claim 1, wherein the flexible tube has three or more bent portions. The carbonated spring manufacturing apparatus according to claim 1 or 2 , wherein the joint portion and the venturi tube are manufactured integrally.

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