JP6396620B1 - Surface treatment method for stainless steel cooling pipe for beer server and beer server assembly method - Google Patents

Abstract

Provided are a surface treatment method for a stainless steel cooling pipe for a beer server capable of improving the smoothness of the inner surface of the pipe, and a method for assembling the beer server.
A surface treatment method for a stainless steel cooling pipe for a beer server polishes an inner surface of a cooling pipe by supplying a chemical polishing liquid from a first end to a second end of the stainless steel cooling pipe. And a chemical polishing liquid removing process for removing the chemical polishing liquid from the inside of the cooling pipe.
[Selection] Figure 1

Description

  The present invention relates to a surface treatment method for a stainless steel cooling pipe for a beer server and a method for assembling a beer server.

  It is known to use a stainless steel cooling pipe as a cooling pipe for a beer server. Since a passive film is formed on the surface of stainless steel, the stainless steel cooling pipe has high corrosion resistance.

  As a related technique, Patent Document 1 describes a surface treatment method for a stainless steel member. In the surface treatment method described in Patent Document 1, a stainless steel member whose surface roughness is 1 μm or less by electrolytic composite polishing is used in a solution in which nitric acid having a concentration of 10% or more or an oxidizing acid is added thereto. It is described that the substrate is oxidized at 40 to 70 ° C. for 5 to 180 minutes.

JP-A-5-33156

  When the beer server is used for a long time, dirt adheres to the inner surface of the stainless steel cooling pipe.

  In general, if the smoothness of the inner surface of the pipe is improved, it becomes difficult for dirt to adhere to the inner surface of the pipe. However, a stainless steel cooling pipe for a beer server has a small inner diameter, has a curved shape, and has a long overall length, so that it has been considered difficult to polish the inner surface of the pipe. For example, since it is virtually impossible to place an electrode inside a stainless steel cooling pipe for a beer server, the inner surface of the pipe cannot be electropolished. Further, even if a stainless steel cooling pipe for a beer server is immersed in a chemical polishing liquid, it is difficult to spread the chemical polishing liquid to every corner of the cooling pipe.

  Then, this invention is providing the surface treatment method of the stainless steel cooling pipe for beer servers which can improve the smoothness of the inner surface of a pipe, and the assembly method of a beer server.

  Hereinafter, means for solving the problem will be described using the numbers and symbols used in the embodiments for carrying out the invention. These numbers and symbols are added with parentheses for reference in order to show an example of the correspondence between the description of the claims and the mode for carrying out the invention. Accordingly, the claims should not be construed as limiting due to the bracketed description.

  In some embodiments, a surface treatment method for a stainless steel cooling pipe for a beer server includes chemical polishing from a first end (11) to a second end (12) of a stainless steel cooling pipe (1). A chemical polishing step of polishing the inner surface (10a) of the cooling pipe by supplying the liquid (L0); and a chemical polishing solution removing step of removing the chemical polishing solution (L0) from the inside of the cooling pipe (1). Do

  In the surface treatment method, in the chemical polishing step, the outer surface (10b) of the cooling pipe (1) or the casting (2) covering the cooling pipe (1) is immersed in a liquid (L1) having a temperature higher than room temperature. It may be executed in the state that has been performed.

  In the surface treatment method, the liquid (L1) may be water or a chemical polishing liquid.

  In the surface treatment method, the second end (12) may be disposed on the same side as the first end (11) with respect to the cooling pipe (1).

  The surface treatment method may further include a scale removal step for removing scale. In addition, the scale removing step may be performed from one of the first end (11) and the second end (12) to the first end (11) and the second end (12). Moving the scale remover (86) toward the other of the two.

  In the surface treatment method, an inner diameter of the cooling pipe (1) may be 7 mm or less. The cooling pipe (1) may have a total length of 10 m or more. Moreover, the said cooling pipe (1) may be provided with the curved shape part (15) which prescribes | regulates a curved flow path.

  In the surface treatment method, a surface roughness of the cooling pipe inner surface (10a) after the chemical polishing step may be 0.1 μm or less.

  The assembly method of the beer server in some embodiments is cooled by supplying a chemical polishing liquid from the first end (11) to the second end (12) of the stainless steel cooling pipe (1). A chemical polishing step of polishing the pipe inner surface (10a), a chemical polishing liquid removing step of removing the chemical polishing liquid from the inside of the cooling pipe (1), the first end (11) and the second end A step of connecting one of (12) to the outlet side pipe (220) of the beer server (200) and the other of the first end (11) and the second end (12). And a step of connecting to the beer storage container side pipe (210) of the beer server (200).

  INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a surface treatment method for a stainless steel cooling pipe for a beer server that can improve the smoothness of the inner surface of the pipe, and a beer server assembly method.

Drawing 1 is a mimetic diagram showing the surface treatment method of the stainless steel cooling pipe for beer servers in a 1st embodiment. Drawing 2 is a mimetic diagram showing the surface treatment method of the stainless steel cooling pipe for beer servers in a 2nd embodiment. Drawing 3 is a mimetic diagram showing the surface treatment method and surface treatment system of the stainless steel cooling pipe for beer servers in a 3rd embodiment. FIG. 4 is a schematic diagram illustrating a surface treatment method and a surface treatment system for a stainless steel cooling pipe for a beer server according to a fourth embodiment. FIG. 5 is a schematic diagram showing an assembling method of the beer server in the fifth embodiment. FIG. 6 is a drawing substitute photograph showing experimental results. FIG. 7 is a drawing-substituting photograph showing the experimental results. FIG. 8 is a drawing-substituting photograph showing the experimental results. FIG. 9 is a drawing substitute photograph showing experimental results.

  Hereinafter, the surface treatment method of the stainless steel cooling pipe 1 for the beer server and the assembly method of the beer server 200 will be described with reference to the accompanying drawings. In the following description, members and parts having the same function are denoted by the same reference numerals, and repeated description of members and parts having the same reference numerals is omitted.

(Definition of terms)
In this specification, “chemical polishing” means that a smooth glossy surface is obtained by bringing the metal surface into contact with solutions of various compositions in order to improve the smoothness of the metal surface. In addition, JIS H 0400: 1998 describes a “chemical polishing method” as a method of dipping in a solution having various compositions to obtain a smooth glossy surface in order to improve the smoothness of the metal surface.

  As used herein, “pickling” means contacting a metal surface with an acid solution to chemically remove oxides or other compounds from the base metal. In general, a glossy surface is not formed by pickling.

  In this specification, “scale” means a solid formed by precipitation of impurities in a solution.

(First embodiment)
With reference to FIG. 1, the surface treatment method of the stainless steel cooling pipe for beer servers in 1st Embodiment is demonstrated. Drawing 1 is a mimetic diagram showing the surface treatment method of the stainless steel cooling pipe for beer servers in a 1st embodiment.

  In the first embodiment, the surface-treated beer server cooling pipe 1A is a stainless steel (for example, SUS304 stainless steel) cooling pipe. During use of the beer server, a refrigerant such as ice water is disposed outside the cooling pipe 1A, and the beer flowing in the cooling pipe is cooled by the refrigerant. And the cooled beer is poured out from the spout of a beer server.

  As shown in FIG. 1, the first end 11 of the cooling pipe 1 </ b> A is connected to the connection end 51 of the chemical polishing liquid supply pipe 50. The connection between the first end portion 11 and the connection end portion 51 is, for example, a screw connection.

  The second end 12 of the cooling pipe is connected to the connection end 55 of the chemical polishing liquid discharge pipe 54. The coupling between the second end 12 and the connection end 55 is, for example, a screw coupling.

  In the example illustrated in FIG. 1, the supply pipe 50 is connected to the chemical polishing liquid storage tank 58. The chemical polishing liquid is configured to flow through the supply pipe 50, the cooling pipe 1 </ b> A, and the discharge pipe 54 by the action of the supply pump 59.

  The surface treatment method of the stainless steel cooling pipe for beer server in the first embodiment includes at least a chemical polishing step and a chemical polishing liquid removal step.

  In the chemical polishing step, the inner surface 10a of the cooling pipe is polished by supplying the chemical polishing liquid L0 from the first end 11 to the second end 12 of the stainless steel cooling pipe 1A.

  Chemical polishing is generally realized by a mechanism in which an oxide is formed in an oxidizing environment and the oxide is dissolved in an acid. More specifically, in the first embodiment, when a solution containing an oxidizing agent and an acid is used as the chemical polishing liquid, a metal oxide diffusion layer is provided between the cooling pipe inner surface 10a and the chemical polishing liquid. The metal component containing iron is diffused and dissolved in the chemical polishing liquid through the diffusion layer. Thus, the cooling pipe inner surface 10a becomes a smooth glossy surface. The chemical polishing liquid used in the first embodiment includes, for example, an oxidizing agent such as nitric acid, an acid such as hydrochloric acid, nitric acid, and sulfuric acid, and a thickening agent such as phosphoric acid.

  In the chemical polishing liquid removal step, the chemical polishing liquid is removed from the inside of the cooling pipe 1A. The chemical polishing liquid removing step is performed by, for example, rinsing liquid (for example, water) from one of the first end portion 11 and the second end portion 12 toward the other of the first end portion 11 and the second end portion 12. ).

  In the first embodiment, the inner surface of a stainless steel cooling pipe 1A for a beer server is smoothed by chemical polishing. The following four effects are synergistically achieved by the smoothing by chemical polishing.

  The first effect is that dirt is less likely to adhere to the inner surface of the cooling pipe 1A due to smoothing by chemical polishing. A smoothed surface is less prone to fouling or deposition than a non-smoothed surface. Furthermore, since dirt does not easily adhere to the inner surface of the cooling pipe 1A, heat exchange efficiency (heat exchange efficiency between the outside of the cooling pipe 1A (refrigerant) and the inside of the cooling pipe 1A (beer)) is improved. Reduction is suppressed.

  A second effect is that pressure loss when beer flows through the cooling pipe 1A is reduced by smoothing by chemical polishing. The pressure loss when the beer flows along the smoothed surface is smaller than the pressure loss when the beer flows along the non-smoothed surface. For this reason, when the cooling pipe 1A smoothed by chemical polishing is used as a cooling pipe for a beer server, the flow rate of beer poured out from the spout is improved, or less energy is required for beer pouring. I'll do it.

  The third effect is that the elution of iron from the cooling pipe 1A to beer is reduced and the beer taste is improved by smoothing by chemical polishing. More specifically, smoothing by chemical polishing reduces the surface area of the cooling pipe inner surface 10a and reduces surface defects. And the quantity of iron oxide exposed to the cooling pipe inner surface 10a reduces by the reduction | decrease of a surface area and the reduction | decrease of a surface defect. As a result, elution of iron from the cooling pipe 1A to beer is reduced. Furthermore, since the flow on the cooling pipe inner surface 10a becomes a laminar flow by the smoothing by chemical polishing, the effect of reducing the elution of iron is further strengthened.

  A fourth effect is that the flow on the inner surface 10a of the cooling pipe becomes a laminar flow due to the smoothing by chemical polishing, and bubbles are less likely to be generated from the beer in the cooling pipe. When pouring beer into a glass, it is preferable that beer does not foam in the initial stage. When the cooling pipe subjected to the chemical polishing treatment is used, foaming of beer poured out from the spout of the beer server is suppressed.

  Of the above effects, the third effect is an effect that cannot be predicted from chemical polishing, and is a synergistic effect produced by the combination of a stainless steel cooling pipe for beer servers and chemical polishing. . In addition, when the inventor of this application uses the cooling pipe 1A smoothed by chemical polishing, the elution amount of iron compared with the case of using the cooling pipe not smoothed by chemical polishing. Is about 1/3 to 1/5.

  Generally, chemical polishing is performed by immersing an article to be polished in a chemical polishing liquid and shaking the article to be polished in the chemical polishing liquid. However, since the inner diameter of the cooling pipe 1A made of stainless steel for beer servers is small and the cooling pipe 1A has the curved shape portion 15 (for example, the spiral shape portion 16), the inside of the cooling pipe 1A is in the chemical polishing liquid. Soaking in is not easy. On the other hand, in the first embodiment, it is difficult to chemically polish the cooling pipe inner surface 10a by supplying the chemical polishing liquid from the first end 11 to the second end 12 of the cooling pipe 1A. Overcoming.

  In the chemical polishing step of the first embodiment, the temperature of the chemical polishing liquid supplied to the first end 11 of the cooling pipe 1A is, for example, a temperature higher than room temperature (for example, 30 degrees Celsius), more specifically. Is from 50 degrees Celsius to 250 degrees Celsius, or from 80 degrees Celsius to 200 degrees Celsius. From the viewpoint of uniformly polishing the inner surface 10a of the cooling pipe, between the temperature of the chemical polishing liquid supplied to the first end 11 of the cooling pipe 1A and the temperature of the chemical polishing liquid discharged from the second end 12 The temperature difference is preferably small. However, since the cooling pipe 1A is used as a heat exchanger, the heat conductivity is high. For this reason, the temperature of the chemical polishing liquid flowing through the cooling pipe 1A gradually decreases due to heat release through the cooling pipe 1A. Therefore, in order to suppress the decrease in the temperature, the chemical polishing process in the first embodiment is performed more specifically in the liquid L1 in which the outer surface 10b of the cooling pipe 1A has a temperature higher than normal temperature (for example, 30 degrees Celsius). Is preferably performed in a state immersed in the liquid L1 of 50 degrees Celsius or higher, or 80 degrees Celsius or higher. FIG. 1 shows a state in which the outer surface 10b of the cooling pipe 1A is immersed in the liquid L1 in the container C.

  When the liquid L1 is a neutral liquid such as water, the liquid L1 can be easily handled. In addition, in the unlikely event, the chemical polishing liquid is a joint between the first end 11 of the cooling pipe 1A and the supply pipe 50, or a joint between the second end 12 of the cooling pipe 1A and the discharge pipe 54. Even when leaking from a part or the like, the leaked liquid is diffused in the neutral liquid. For this reason, the safety | security at the time of chemical polishing liquid leakage is ensured.

  Alternatively, the liquid L1 may be a chemical polishing liquid. In this case, in addition to the cooling pipe inner surface 10a, the outer surface 10b of the cooling pipe 1A is also polished by the chemical polishing liquid. As a result, the adhesion of dirt to the outer surface 10b of the cooling pipe 1A is suppressed. Moreover, since the adhesion of dirt to the outer surface 10b of the cooling pipe 1A is suppressed, a decrease in heat exchange efficiency due to the adhesion of dirt is suppressed. When the liquid L1 is a chemical polishing liquid, the liquid L1 is preferably the same type of chemical polishing liquid as the chemical polishing liquid supplied into the cooling pipe 1A. In this case, in the unlikely event, the chemical polishing liquid is a joint between the first end 11 of the cooling pipe 1A and the supply pipe 50, or a joint between the second end 12 of the cooling pipe 1A and the discharge pipe 54. Even when leaking from a portion or the like, the leaked liquid is received by the same type of chemical polishing liquid. For this reason, the safety | security at the time of chemical polishing liquid leakage is ensured.

  In the example illustrated in FIG. 1, the second end 12 is disposed on the same side as the first end 11 with respect to the cooling pipe 1 </ b> A. In other words, when the posture of the cooling pipe 1A is maintained such that the first end portion 11 is located above the cooling pipe 1A, the second end portion 12 is also located above the cooling pipe 1A. For this reason, the operation | work which connects the 1st end part 11 and the 2nd end part 12 to the supply pipe | tube 50 and the discharge pipe 54 becomes easy. However, the arrangement of the first end portion 11 and the second end portion 12 in the cooling pipe 1A is not limited to the example described in FIG. 1 and is arbitrary. Therefore, the second end 12 may be arranged on the opposite side of the first end 11 with respect to the cooling pipe 1A.

  In the example described in FIG. 1, the first end portion 11 and the second end portion 12 are located above the liquid L1. Alternatively, the first end portion 11 and the second end portion 12 may be immersed in the liquid L1.

(Second Embodiment)
With reference to FIG. 2, the surface treatment method of the stainless steel cooling pipe for beer servers in 2nd Embodiment is demonstrated. Drawing 2 is a mimetic diagram showing the surface treatment method of the stainless steel cooling pipe for beer servers in a 2nd embodiment.

  In the first embodiment, an example in which the outer surface 10b of a stainless steel cooling pipe 1A for beer servers is exposed to the outside, in other words, an example in which the cooling pipe 1 is an outer surface exposed type cooling pipe 1A will be described. It was done. The second embodiment is different from the first embodiment in that the outer surface of a stainless steel cooling pipe 1B for a beer server is not exposed to the outside and is covered with a cast body 2. The second embodiment is the same as the first embodiment in other points. Therefore, in 2nd Embodiment, it demonstrates centering on the relationship between the cooling pipe 1B and the casting 2, and the description which becomes the repetition about another matter is abbreviate | omitted.

  In the example illustrated in FIG. 2, the cooling pipe 1B is a cooling pipe made of stainless steel (for example, made of SUS304 stainless steel). Further, the periphery of the cooling pipe 1 </ b> B is covered with the cast body 2. The cast body 2 is made of, for example, a high heat conductive metal such as aluminum. By placing the cooling pipe 1B in the mold and pouring molten metal into the mold, the cooling plate PL in which the cooling pipe 1B is embedded in the cast body 2 is formed.

  The surface treatment method for a stainless steel cooling pipe for a beer server according to the second embodiment includes at least a chemical polishing step and a chemical polishing liquid removing step.

  In the chemical polishing step, the chemical polishing liquid is supplied from the first end 11 to the second end 12 of the stainless steel cooling pipe 1B, whereby the inner surface 10a of the cooling pipe is polished.

  In the chemical polishing step of the second embodiment, the temperature of the chemical polishing liquid supplied to the first end 11 of the cooling pipe 1A is, for example, a temperature higher than room temperature (for example, 30 degrees Celsius), more specifically. Specifically, it is 50 degrees Celsius or more and 250 degrees Celsius or less, or 80 degrees Celsius or more and 200 degrees Celsius or less. From the viewpoint of uniformly polishing the inner surface 10a of the cooling pipe, between the temperature of the chemical polishing liquid supplied to the first end 11 of the cooling pipe 1A and the temperature of the chemical polishing liquid discharged from the second end 12 The temperature difference is preferably small. In the example shown in FIG. 2, the casting 2 is immersed in a liquid L1 having a temperature higher than room temperature (for example, 30 degrees Celsius), more specifically, a liquid L1 having a temperature of 50 degrees Celsius or higher, or 80 degrees Celsius or higher. Has been. Therefore, the casting 2 and the cooling pipe 1B are kept warm by the liquid L1, and the temperature of the chemical polishing liquid supplied to the first end 11 of the cooling pipe 1B and the chemical polishing liquid discharged from the second end 12 are The temperature difference between the temperature is small.

  When the liquid L1 is a neutral liquid such as water, the liquid L1 can be easily handled. In addition, in the unlikely event, the chemical polishing liquid is a joint between the first end 11 of the cooling pipe 1B and the supply pipe 50, or a joint between the second end 12 of the cooling pipe 1B and the discharge pipe 54. Even when leaking from a part or the like, the leaked liquid is diffused in the neutral liquid. For this reason, the safety | security at the time of chemical polishing liquid leakage is ensured.

  The second embodiment has the same effects as the first embodiment.

(Third embodiment)
With reference to FIG. 3, the surface treatment method of the stainless steel cooling pipe for beer servers in 3rd Embodiment is demonstrated. FIG. 3 is a schematic diagram showing a surface treatment method and a surface treatment system 100A for a stainless steel cooling pipe for a beer server according to a third embodiment.

  A surface treatment system 100A for a stainless steel cooling pipe for a beer server in a third embodiment includes a chemical polishing apparatus 120 that chemically polishes the inner surface of the cooling pipe 1, and a chemical polishing that removes a chemical polishing liquid from the inside of the cooling pipe 1. A liquid removing device 130. The surface treatment system 100 </ b> A may include at least one of a pickling device 110 that pickles the inner surface of the cooling pipe 1 and a scale removing device 140 that removes scale from the inside of the cooling pipe 1.

  The surface treatment method of the stainless steel cooling pipe for beer server in the third embodiment includes a pretreatment step and a posttreatment step in addition to the chemical polishing step. The pretreatment process is a process executed before the chemical polishing process, and the post-treatment process is a process executed after the chemical polishing process. The chemical polishing step is the same as the chemical polishing step in the first embodiment or the second embodiment. Therefore, the repeated description about the chemical polishing step is omitted.

  In the example illustrated in FIG. 3, the pretreatment process includes a pickling process performed by the pickling apparatus 110. In the pickling process, the first end portion 11 of the cooling pipe 1 is connected to the connection end portion 61 of the acid solution supply pipe 60. The connection between the first end portion 11 and the connection end portion 61 is, for example, a screw connection.

  Further, the second end 12 of the cooling pipe 1 is connected to the connection end 65 of the acid solution discharge pipe 64. The coupling between the second end 12 and the connection end 65 is, for example, a screw coupling.

  In the example shown in FIG. 3, the acid solution supply pipe 60 is connected to the acid solution storage tank 68. The acid solution is configured to flow through the acid solution supply pipe 60, the cooling pipe 1, and the acid solution discharge pipe 64 by the action of the supply pump 69.

  In the pickling process, the inner surface 10a of the cooling pipe is pickled by supplying an acid solution from the first end 11 to the second end 12 of the cooling pipe 1 made of stainless steel. In the pickling process, the acid solution may be supplied from the second end 12 of the cooling pipe 1 toward the first end 11.

  By the pickling process, scale, rust, and other impurities are removed from the cooling pipe inner surface 10a, and the inner surface 10a is cleaned. In addition, the surface after pickling generally does not become a glossy surface. Therefore, the cooling pipe inner surface 10a after the pickling process is a non-glossy surface. The acid solution used in the pickling process is, for example, a mixed solution of nitric acid and hydrofluoric acid.

  The pickling process may be performed in a state where the outer surface 10b of the cooling pipe 1 (or a cast body covering the cooling pipe 1) is immersed in the liquid L2. In addition, an acid solution removing step for removing the acid solution from the inside of the cooling pipe 1 may be performed after the pickling step and before the chemical polishing step by the chemical polishing apparatus 120.

  In the example illustrated in FIG. 3, the post-processing process includes a chemical polishing liquid removal process executed by the chemical polishing liquid removal apparatus 130 and a scale removal process executed by the scale removal apparatus 140.

  In the chemical polishing liquid removing step, the first end 11 of the cooling pipe 1 is connected to the connection end 71 of the rinse liquid supply pipe 70. The connection between the first end 11 and the connection end 71 is, for example, a screw connection.

  The second end 12 of the cooling pipe 1 is connected to the connection end 75 of the rinse liquid discharge pipe 74. The coupling between the second end 12 and the connection end 75 is, for example, a screw coupling.

  In the example illustrated in FIG. 3, the rinse liquid supply pipe 70 is connected to the rinse liquid storage tank 78. The rinsing liquid is configured to flow through the rinsing liquid supply pipe 70, the cooling pipe 1, and the rinsing liquid discharge pipe 74 by the action of the supply pump 79.

  In the chemical polishing liquid removal step, the chemical polishing liquid is removed from the cooling pipe 1 by supplying a rinsing liquid from the first end 11 to the second end 12 of the cooling pipe 1 made of stainless steel. In the chemical polishing liquid removing step, the rinsing liquid may be supplied from the second end portion 12 of the cooling pipe 1 toward the first end portion 11.

  In the scale removal process, the first end 11 of the cooling pipe 1 is connected to the connection end 81 of the first pipe 80. The coupling between the first end 11 and the connection end 81 is, for example, a screw coupling.

  In the scale removal step, the second end 12 of the cooling pipe 1 is connected to the connection end 85 of the second pipe 84. The coupling between the second end 12 and the connection end 85 is, for example, a screw coupling.

  The scale removing step removes the scale from one of the first end 11 and the second end 12 of the cooling pipe 1 toward the other of the first end 11 and the second end 12 of the cooling pipe 1. Including moving the body 86. The scale removing body 86 is pressed and driven by an arbitrary fluid (for example, water) supplied from the first pipe 80 or the second pipe 84. The fluid that presses and drives the scale removing body 86 is supplied using, for example, a supply pump 89.

  The scale remover 86 is a solid material such as a sponge. When the scale removing body 86 is a compressible solid material such as a sponge, the size of the solid material (for example, the diameter of the solid material) is preferably larger than the inner diameter of the cooling pipe 1. . In this case, the scale removing body 86 moves along the inner surface while pressing the inner surface of the cooling pipe.

  In the third embodiment, the scale removing body 86 moves in the cooling pipe 1 to remove the scale floating in the cooling pipe 1A or the scale attached to the cooling pipe inner surface 10a.

  The third embodiment has the same effect as the first embodiment or the second embodiment. Moreover, when the surface treatment method of the cooling pipe 1 includes a pickling process, the cooling pipe inner surface 10a is cleaned before the chemical polishing process. For this reason, the smoothness of the surface after the chemical polishing step is improved. Moreover, when the surface treatment method of the cooling pipe 1 includes a scale removing step, the metal oxide dissolved by the chemical polishing step is prevented from depositing and adhering to the cooling pipe inner surface 10a. For this reason, the smoothness of the surface after the chemical polishing step is maintained.

  FIG. 3 shows an example in which the cooling pipe 1 is an outer surface exposed type cooling pipe. However, the cooling pipe 1 in the third embodiment may be the cooling pipe 1B embedded in the casting 2. In the third embodiment, one of the pickling process and the scale removing process may be omitted.

(Fourth embodiment)
With reference to FIG. 4, the surface treatment method of the stainless steel cooling pipe for beer servers in 4th Embodiment is demonstrated. FIG. 4 is a schematic diagram showing a surface treatment method and a surface treatment system 100B of a stainless steel cooling pipe for a beer server according to a fourth embodiment.

  In the surface treatment system 100B for the stainless steel cooling pipe for beer server in the fourth embodiment, a part of the pickling apparatus 110 and a part of the chemical polishing apparatus 120 are shared. In the surface treatment system 100B, a part of the chemical polishing apparatus 120 and a part of the chemical polishing liquid removing apparatus 130 are shared.

  In the third embodiment illustrated in FIG. 3, a pipe for supplying an acid solution to the cooling pipe 1, a pipe for supplying a chemical polishing liquid to the cooling pipe 1, and a pipe for supplying a rinse liquid to the cooling pipe 1. The case where the roads are independent pipe lines has been described.

  On the other hand, in the example shown in FIG. 4, at least a part of the acid solution supply pipe 60 that supplies the acid solution to the cooling pipe 1 and at least a part of the supply pipe 50 that supplies the chemical polishing liquid to the cooling pipe 1 are provided. Shared. More specifically, in the example shown in FIG. 4, the connection pipe 101 connected to the cooling pipe 1 functions as a part of the acid solution supply pipe 60 and a part of the supply pipe 50 that supplies the chemical polishing liquid. Also works. A valve 102 that switches the type of liquid supplied to the connection pipe 101 is disposed on the upstream side of the connection pipe 101.

  In the example shown in FIG. 4, at least a part of the supply pipe 50 that supplies the chemical polishing liquid to the cooling pipe 1 and at least a part of the rinse liquid supply pipe 70 that supplies the rinse liquid to the cooling pipe 1 are shared. Has been. More specifically, in the example shown in FIG. 4, the connection pipe 101 connected to the cooling pipe 1 functions as a part of the supply pipe 50 that supplies the chemical polishing liquid, and one of the rinse liquid supply pipes 70. It also functions as a part.

  The execution procedure of the surface treatment method of the stainless steel cooling pipe for beer server in the fourth embodiment is the same as the execution procedure of the surface treatment method of the stainless steel cooling pipe for beer server in the third embodiment. However, in the fourth embodiment, when the type of liquid supplied to the cooling pipe 1 is changed, there is no need to replace the supply pipe directly connected to the first end portion 11 of the cooling pipe 1. The operation | work which replaces the discharge pipe directly connected to the 1st 2nd edge part 12 is unnecessary.

(Fifth embodiment)
With reference to FIG. 5, the assembly method (for example, manufacturing method) of the beer server in 5th Embodiment is demonstrated. FIG. 5 is a schematic diagram showing an assembling method of the beer server 200 in the fifth embodiment.

  The assembly method of the beer server 200 in the fifth embodiment includes the surface treatment method of the stainless steel cooling pipe for beer server in any one of the first to fourth embodiments. Moreover, the assembly method of the beer server in the fifth embodiment is the same as that of the cooling pipe 1 after executing the surface treatment method of the stainless steel cooling pipe for beer server in any one of the first to fourth embodiments. Of the step of connecting one of the first end 11 and the second end 12 to the spout side piping 220 of the beer server 200, the first end 11 and the second end 12 of the cooling pipe 1 Connecting the other to the beer storage container side pipe 210 of the beer server 200.

  In the example illustrated in FIG. 5, the beer server 200 includes a cooling unit 201 in which the cooling pipe 1 is accommodated, a pouring unit 202 for pouring beer, a beer storage container side pipe 210, and a spout side pipe 220. Is provided. In addition, the base end part of the beer storage container side pipe 210 is connected to the beer storage container 300, and the front end part of the spout outlet side pipe 220 is connected to the extraction part 202.

  In the example illustrated in FIG. 5, the tip end portion 211 of the beer storage container side pipe 210 is connected to the first end portion 11 of the cooling pipe 1. More specifically, the tip end portion 211 of the beer storage container side pipe 210 is provided with a female screw portion (or male screw portion), and the first end portion 11 of the cooling pipe 1 is provided with a male screw portion (or female screw portion). Both screw portions are screwed together.

  In the example shown in FIG. 5, the base end 221 of the spout side pipe 220 is connected to the second end 12 of the cooling pipe 1. More specifically, the base end portion 221 of the outlet side pipe 220 includes a female screw portion (or male screw portion), and the second end portion 12 of the cooling pipe 1 includes a male screw portion (or female screw portion). Both screw portions are screwed together.

  The fifth embodiment has the same effects as any of the first to fourth embodiments. In addition, the beer server 200 assembled by the method of assembling the beer server in the fifth embodiment is (A) an effect that the inner surface of the cooling pipe is smoothed by chemical polishing, so that dirt is difficult to adhere, (B ) Effect that iron elution from the cooling pipe to beer is less and beer taste is improved, (C) Effect that beer foaming is suppressed because the inner surface of the cooling pipe is smoothed by chemical polishing, etc. Can be played synergistically.

(Size and shape of cooling pipe 1)
The size of the cooling pipe 1 used in the first to fifth embodiments will be described. In the embodiment, the inner diameter of the cooling pipe 1 is preferably 3 mm or more and 7 mm or less. If the inner diameter of the cooling pipe 1 is smaller than 3 mm, the amount of beer dispensed per unit time may be too small. Moreover, when the internal diameter of the cooling pipe 1 becomes larger than 7 mm, cooling of beer may become inadequate, and air bubbles are easily generated from the beer in the cooling pipe 1.

  In the embodiment, the overall length of the cooling pipe 1 is preferably 10 m or more and 15 m or less. If the total length of the cooling pipe 1 is shorter than 10 m, the cooling of beer may be insufficient. Moreover, if the total length of the cooling pipe 1 is longer than 15 m, the entire size of the cooling pipe 1 becomes large, and it may be difficult to accommodate the beer server of the existing size. Moreover, the pressure loss at the time of a beer flowing through the cooling pipe 1 becomes large, and there exists a possibility that the extraction speed | rate of the beer from the extraction | pouring part 202 may become inadequate.

  In the embodiment, the cooling pipe 1 preferably includes a curved shape portion 15 (for example, a spiral shape portion 16) that defines a curved flow channel (for example, a spiral flow channel). When the cooling pipe 1 includes the curved flow path, the entire cooling pipe 1 can be made compact.

  Stainless steel cooling pipes for beer servers have a small inner diameter, a curved shape, and a long overall length. For this reason, it is difficult to polish the inner surface of the pipe. On the other hand, the embodiment is epoch-making in that the inner surface of the cooling pipe is positively chemically polished by supplying the chemical polishing liquid from the first end to the second end of the cooling pipe. . Furthermore, in the embodiment, elution of iron from the cooling pipe to the beer is suppressed. For this reason, in an embodiment, the unexpected effect that the taste of beer is improved is produced.

(Experimental result)
6 to 9 are photographs substituted for drawings showing the experimental results. In the experiment, a first example (corresponding to the embodiment) in which pickling and chemical polishing were performed on a stainless steel plate, and a second example (comparative example) in which only a pickling treatment was performed on a stainless steel plate. A comparison was made.

  FIG. 6 is a photograph of the surface of the stainless steel plate in the first example, and FIG. 7 is a photograph of the surface of the stainless steel plate in the second example. In the first example, the surface of the stainless steel plate has gloss, whereas in the second example, the surface of the stainless steel plate does not have gloss.

  FIG. 8 is a photomicrograph (magnification: 500 times) of the surface of the stainless steel plate in the first example, and FIG. 9 is a photomicrograph (magnification: 500 times) of the surface of the stainless steel plate in the second example. is there. In the first example, the surface of the stainless steel plate is smooth, whereas in the second example, there are more grooves, irregularities, and the like on the surface of the stainless steel plate.

  The surface roughness Ra (arithmetic mean roughness Ra measured in accordance with JIS B601: 2001) of the surface of the stainless steel plate in the first example was 0.0567 μm. On the other hand, the surface roughness Ra (arithmetic average roughness Ra measured in accordance with JIS B601: 2001) of the surface of the stainless steel plate in the second example was 0.1116 μm. Therefore, the surface roughness of the surface of the stainless steel plate (in other words, the surface roughness Ra of the inner surface of the cooling pipe 1, that is, the arithmetic average roughness Ra measured in accordance with JIS B601: 2001) is 0.1 μm or less. In order to achieve this, it is understood that a chemical polishing process may be performed.

  The present invention is not limited to the embodiments described above, and it is obvious that the embodiments can be appropriately modified or changed within the scope of the technical idea of the present invention. In addition, various techniques used in each embodiment can be applied to other embodiments as long as no technical contradiction occurs. Furthermore, the optional additional configuration in each embodiment can be omitted as appropriate.

1, 1A, 1B: Cooling pipe 2: Cast body 10a: Cooling pipe inner surface 10b: Outer surface 11: First end 12: Second end 15: Curved shape portion 16: Spiral shape portion 50: Supply pipe 51: Connection end Unit 54: discharge pipe 55: connection end 58: chemical polishing solution storage tank 59: supply pump 60: acid solution supply pipe 61: connection end 64: acid solution discharge pipe 65: connection end 68: acid solution storage tank 69 : Supply pump 70: Rinse liquid supply pipe 71: Connection end 74: Rinse liquid discharge pipe 75: Connection end 78: Rinse liquid storage tank 79: Supply pump 80: First pipe 81: Connection end 84: Second pipe 85: Connection end 86: Scale remover 89: Supply pump 100A, 100B: Surface treatment system 101: Connection pipe 102: Valve 110: Pickling apparatus 120: Chemical polishing apparatus 130: Chemical laboratory Liquid removal device 140: Scale removal device 200: Beer server 201: Cooling unit 202: Extraction unit 210: Beer storage container side piping 211: Tip portion 220: Outlet side piping 221: Base end portion 300: Beer storage container C: Container L0: Chemical polishing liquid L1: Liquid L2: Liquid PL: Cooling plate

Claims (7)

A chemical polishing step of polishing the inner surface of the cooling pipe by supplying a chemical polishing liquid from the first end to the second end of the stainless steel cooling pipe for cooling the beer flowing inside;
A chemical polishing liquid removing step for removing the chemical polishing liquid from the inside of the cooling pipe ,
The chemical polishing step is a surface treatment method for a stainless steel cooling pipe for a beer server that is performed in a state where an outer surface of the cooling pipe or a casting covering the cooling pipe is immersed in a liquid having a temperature higher than room temperature . The surface treatment method for a stainless steel cooling pipe for a beer server according to claim 1 , wherein the liquid is water or a chemical polishing liquid. Said second end portion, the relative cooling pipe, the surface treatment method of the stainless steel cooling pipe beer server according to claim 1 or 2 are arranged on the same side as the first end. A scale removing step for removing the scale;
The scale removing step includes moving a scale removing body from one of the first end and the second end toward the other of the first end and the second end. The surface treatment method of the stainless steel cooling pipe for beer servers as described in any one of Claims 1 thru | or 3 . The inner diameter of the cooling pipe is 7 mm or less,
Before SL cooling pipe, the surface treatment method of beer server for stainless steel cooling pipe according to any one of claims 1 to 4 comprising a curved portion defining the curved channel. Ri surface roughness der less 0.1μm of the cooling pipe inner surface after the chemical polishing step,
The surface treatment method for a stainless steel cooling pipe for a beer server according to any one of claims 1 to 5 , wherein the surface roughness is an arithmetic average roughness Ra measured according to JIS B601: 2001 . A chemical polishing step of polishing the inner surface of the cooling pipe by supplying a chemical polishing liquid from the first end of the stainless steel cooling pipe toward the second end;
A chemical polishing liquid removing step of removing the chemical polishing liquid from the inside of the cooling pipe;
Connecting one of the first end and the second end to the outlet side piping of the beer server;
Connecting the other of the first end and the second end to a beer storage container side pipe of a beer server, and
The chemical polishing step is performed in a state where an outer surface of the cooling pipe or a casting covering the cooling pipe is immersed in a liquid having a temperature higher than room temperature,
The cooling pipe includes a curved portion that defines a curved flow path.