JP2007016968A - Open rack type carburetor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an open rack type carburetor of excellent convenience preventing the occurrence of a liquefied gas concentrating phenomenon. <P>SOLUTION: The open rack type carburetor comprises a lower header pipe, an upper header pipe, heat exchanger tubes 3, a heat insulating material 14, an impervious member 15 and a refrigerant supply member. Liquefied gas flows into the lower header pipe, and vaporized gas of the liquefied gas flows out of the upper header pipe. The heat exchanger tubes 3 connect the lower header pipe and the upper header pipe. The heat insulating material 14 is formed on the surface of the lower header pipe. The impervious member 15 is formed with openings, and the heat transfer tubes 3 are arranged on the surface of the heat insulating material 14 in a state of being inserted in the openings. The refrigerant supply member supplies a refrigerant for exchanging heat with the liquefied gas, to the outside of the heat exchanger tubes 3 to vaporize the liquefied gas. The impervious member 15 has cut parts extending from the openings to the outer periphery of the impervious member 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an open rack type vaporizer, and more particularly to an open rack type vaporizer that prevents the occurrence of a liquefied gas concentration phenomenon and is excellent in convenience.

  Conventionally, when a low-temperature liquefied gas such as LNG (liquefied natural gas) is vaporized into a gas state gas such as NG (natural gas), an open rack type vaporizer that vaporizes using a refrigerant such as seawater ( ORV) is used.

  An open rack type vaporizer vaporizes LNG into NG in a gaseous state, for example, using LNG as a liquefied gas and seawater as a refrigerant. FIG. 18 is a schematic diagram showing heat exchange between the refrigerant and the liquefied gas. FIG. 19 is an enlarged perspective view of the vicinity of the coolant sprinkling trough. Referring to FIGS. 18 and 19, a lower header pipe 102 and an upper header pipe 104 are arranged at a distance in the vertical direction. The liquefied gas passes through the heat transfer tube 103 that connects the lower header tube 102 and the upper header tube 104. The refrigerant overflowing from the refrigerant sprinkling trough 106 flows along the outside of the heat transfer tube 103. The liquefied gas inside the heat transfer tube 103 and the refrigerant outside the heat transfer tube 103 exchange heat. Thereby, liquefied gas is vaporized to gas of a gaseous state.

  In such an open rack type vaporizer, an open rack type vaporizer described in Japanese Patent Application Laid-Open No. 2003-166698 (Patent Document 1) is provided for the purpose of maintaining a heat insulating effect on the lower header pipe 102 over a long period of time. It is disclosed.

FIG. 20 is a cross-sectional view of the open rack type vaporizer disclosed in Patent Document 1. The open rack type vaporizer 200 includes a heat exchange tube 208, a lower header 204, heat insulators 222 and 224, protective seal sheets 230 and 232, and a drain opening 226.
JP 2003-166698 A

  However, in the open rack type vaporizer, referring to FIG. 18, since a large amount of refrigerant continues to flow outside the lower header pipe 102, if the flow rate of the liquefied gas flowing inside the lower header pipe 102 is small, the lower header pipe 102 In this case, the heat exchange between the refrigerant and the liquefied gas is excessively performed. Then, a part of the liquefied gas is vaporized in the lower header pipe 102, and the component that is easily vaporized has a low calorific value, so that a so-called gas concentration (clogging) phenomenon occurs in the liquefied gas in the lower header pipe 102. .

  When this liquefied gas concentration phenomenon occurs, various problems occur due to, for example, combustion becoming temporarily unstable in the terminal equipment that supplies gas through the upper header tube 102 of the open rack type vaporizer. In addition, the gas quality has one purpose of maintaining a constant amount of heat. However, changing the gas component causes a change in the amount of heat. That is, the problem that the quality of gas will fall arises.

  On the other hand, in the open rack type vaporizer disclosed in Patent Document 1, at least two protective seal sheets 230 and 232 are fixed by passing through the heat exchange tube 208. Therefore, when inspecting the open rack type vaporizer 200, there is a problem that it takes time to attach and detach the protective seal sheets 230 and 232. Further, it is disclosed that the protective seal sheets 230 and 232 are made of aramid fibers. However, although aramid fibers are excellent in extreme cold resistance, processability, and flexibility, they also have a problem that they are low in water barrier and generally expensive.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an open rack type vaporizer excellent in convenience by preventing the occurrence of a liquefied gas concentration phenomenon. That is.

  An open rack type vaporizer according to one aspect of the present invention includes a lower header pipe, an upper header pipe, a heat transfer pipe, a heat insulating material, a water shielding member, and a refrigerant supply member. The liquefied gas flows into the lower header pipe. The gas from which the liquefied gas is vaporized flows out from the upper header pipe. The heat transfer tube connects the lower header tube and the upper header tube. Insulation is formed on the surface of the lower header tube. The water shielding member is disposed on the surface of the heat insulating material in a state where an opening is formed and the heat transfer tube is inserted into the opening. The refrigerant supply member supplies a refrigerant for heat exchange with the liquefied gas to the outside of the heat transfer tube in order to vaporize the liquefied gas. The water shielding member has a cutting portion extending from the opening to the outer periphery of the water shielding member.

  Thereby, a water shielding member can be attached or detached between a heat exchanger tube and the heat insulating material arrange | positioned on a lower header pipe | tube via a cutting part. Therefore, it becomes easy to attach and detach the water shielding member, and it is excellent in convenience. Moreover, since the refrigerant prevents the refrigerant from flowing into the lower header pipe surface through the gap of the heat insulating material, the heat exchange effectively suppresses heat exchange between the liquefied gas flowing through the lower header pipe and the refrigerant. it can. Therefore, it is possible to prevent the liquefied gas from being vaporized in the lower header. Therefore, the occurrence of the liquefied gas concentration phenomenon can be prevented.

  In the open rack type vaporizer, preferably, the material of the water shielding member is made of silicone.

  Thereby, since silicone is excellent in a softness | flexibility and workability, it is easy to provide the cutting part in a water-impervious member. Therefore, the shape of the water shielding member can be made easier to attach and detach. In addition, since silicone has extreme cold resistance, even in extremely cold environments such as the temperature of liquefied gas, the water shielding member passes through the gap between the heat insulating materials and the refrigerant flows into the surface of the lower header tube. Can be prevented.

  An open rack type vaporizer according to another aspect of the present invention includes a lower header pipe, an upper header pipe, a heat transfer pipe, a heat insulating material, a water shielding member, and a refrigerant supply member. The liquefied gas flows into the lower header pipe. The gas from which the liquefied gas is vaporized flows out from the upper header pipe. The heat transfer tube connects the lower header tube and the upper header tube. Insulation is formed on the surface of the lower header tube. The water shielding member is disposed on the surface of the heat insulating material in a state where an opening is formed and the heat transfer tube is inserted into the opening. The refrigerant supply member supplies a refrigerant for heat exchange with the liquefied gas to the outside of the heat transfer tube in order to vaporize the liquefied gas. The material of the water shielding part is made of silicone.

  As a result, since the liquid gas is extremely cold, the lower header tube through which the liquid gas flows is in an extremely low temperature environment, but silicone is resistant to the environment, so that its properties are unlikely to change and heat insulation is performed. It is possible to prevent the refrigerant from flowing into the surface of the lower header pipe through the gap between the materials. Therefore, heat exchange between the liquefied gas flowing in the lower header pipe and the refrigerant can be effectively suppressed by the heat insulating material. Therefore, since the liquefied gas can be prevented from being vaporized in the lower header, the occurrence of the liquefied gas concentration phenomenon can be prevented. In addition, since silicone has good flexibility and workability, it can be formed into a desired shape as a water shielding member. Therefore, the convenience can be improved.

  In the open rack type vaporizer according to the present invention, the heat insulating material is preferably a foam material. The “foaming material” means a solid containing air or gas.

  As a result, the foam material is extremely lightweight, has good workability, and is extremely cold resistant, so that the liquid gas flowing through the lower header pipe and the refrigerant are further insulated. can do.

  In the open rack type vaporizer of the present invention, the foam material is preferably a carbon dioxide foamed rigid urethane foam.

  Thereby, the liquid gas and refrigerant which flow through a lower header pipe can be insulated efficiently. Moreover, by adopting a rigid urethane foam that does not use a chlorofluorocarbon foaming agent, it is possible to maintain heat insulation performance and to reduce the environmental load.

  The “rigid urethane foam” means a foamed material having a polyurethane resin as a main component and foamed.

  Preferably, the open rack type vaporizer of the present invention further includes a lower header pipe, a heat insulating material, and a member for binding the water shielding member on the surface of the water shielding member.

  Thereby, the heat insulating material and the water shielding member disposed on the surface of the lower header pipe can be bound to the lower header pipe, and the stability is increased.

  Preferably, in the open rack type vaporizer of the present invention, the material of the member to be bound includes at least one selected from the group consisting of nylon, fluororesin, polypropylene, polyacetal, and polyethylene.

  Thereby, it is hard to damage a heat insulating material and a water shielding member on the property of the material. Therefore, the binding force can be ensured without damaging the heat insulating material and the water shielding member.

  In the open rack type vaporizer of the present invention, preferably, the member to be bound is a detachable band.

  Thereby, attachment and removal of the member to be bound are facilitated. Therefore, the handling is easy and the binding force can be ensured.

  As described above, according to the present invention, since the water shielding member has at least one of the shape having the cut portion and the material made of silicone, the occurrence of the concentration phenomenon of the liquefied gas is prevented, which is convenient. It is possible to provide an open rack type vaporizer with excellent properties.

  Embodiments of the present invention will be described below. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic perspective view showing an open rack type vaporizer according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram showing a state in which the liquefied gas is vaporized. FIG. 3 is an enlarged side view of a portion where the lower header tube and the heat transfer tube are connected. 4 is a cross-sectional view taken along line IV-IV in FIG. With reference to FIGS. 1-4, the open rack type vaporizer | carburetor in Embodiment 1 of this invention is demonstrated.

  As shown in FIGS. 1 to 4, the open rack type vaporizer 1 according to Embodiment 1 of the present invention includes, for example, a lower header pipe 2, a heat transfer pipe 3, an upper header pipe 4, a refrigerant supply member 5, A refrigerant sprinkling trough 6, a liquefied gas supply member 7, a heat insulating material 14, and a water shielding member 15 are provided. The liquefied gas flows into the lower header pipe 2. From the upper header pipe 4, the gas in which the liquefied gas is vaporized flows out. The heat transfer tube 3 connects the lower header tube 2 and the upper header tube 4. In the heat transfer tube 3, the liquefied gas flowing in from the lower header tube 2 is vaporized by heat from an external refrigerant as it flows upward. The vaporized gas flows from the heat transfer tube 3 to the upper header tube 4. The heat insulating material 14 is formed on the surface of the lower header pipe 2. The water shielding member 15 is disposed on the surface of the heat insulating material 14 in a state where an opening is formed and the heat transfer tube 3 is inserted into the opening. The water shielding member 15 has a cut portion extending from the opening to the outer periphery of the water shielding member 15. The refrigerant supply member 5 supplies a refrigerant for heat exchange with the liquefied gas to the outside of the heat transfer tube 3 in order to vaporize the liquefied gas. The liquefied gas supply member 7 supplies the liquefied gas to be vaporized.

  Specifically, referring to FIG. 1 and FIG. 2, in the open rack type carburetor 1, a plurality of lower header pipes 2 and a plurality of upper header pipes 4 are installed on the surface on which the open rack type vaporizer 1 is installed. It is extended in the direction parallel to it. The heat transfer tube 3 extends in a direction perpendicular to the extending direction of the lower header tube 2 and the upper header tube 4. Moreover, in order to increase the surface area where the refrigerant and the liquefied gas can exchange heat, a plurality of heat transfer tubes 3 are collected to form a panel. The refrigerant supply member 5 includes a portion extending in parallel with the upper header pipe 4. The refrigerant sprinkling trough 6 is parallel to the upper header pipe 4 and is bent and extended so as to have an opening above. The refrigerant sprinkling trough 6 is installed in the vicinity of the connection portion between the upper header pipe 4 and the heat transfer pipe 3. The refrigerant supply member 5 and the refrigerant watering trough 6 are connected.

  3 and 4, the heat insulating material 14 is composed of two or more members in the cross section in the extending direction of the heat transfer tube 3. A heat insulating material 14 composed of two or more members is disposed via the heat transfer tube 3 so as to cover the surface of the lower header tube 2. The material of the heat insulating material 14 is preferably a foam material, and more preferably a hard urethane foam foam material with carbon dioxide foam.

  3 and 4, the water shielding member 15 includes a plurality of water shielding members 15 with respect to one heat transfer tube 3. When the heat transfer tube 3 is inserted into the water-impervious member 15, it has a relatively long part and a relatively short part through the opening (in FIG. 4, the lower-side water-impervious member 15 is relatively short on the left side. The right side is a relatively long state). When a plurality of water shielding members 15 are stacked on the upper surface of the lower header pipe 2, the stacking order is such that relatively long portions and relatively short portions alternate (in FIG. The water shielding member 15 has a relatively long portion arranged on the right side, and the upper layer water shielding member 15 has a relatively long portion arranged on the left side. The material of the water shielding member 15 is silicone.

  In the first embodiment, LNG is used as the liquefied gas, and seawater is used as the refrigerant. The material of the heat transfer tube 3 is an aluminum alloy. The surface on which the open rack type carburetor 1 is installed is horizontal. As a result, the lower header pipe 2, the upper header pipe 4, and the coolant sprinkling trough 6 extend in the horizontal direction, and the heat transfer pipe 3 extends in the vertical direction. Be present.

  The heat insulating material 14 is made of carbon dioxide foamed rigid urethane foam. Moreover, the heat insulating material 14 is made into the shape which covers the lower header pipe | tube 2 with the two cylindrical members (member divided into 2) which were cracked in the longitudinal direction half with respect to the central axis. And about the connection part of the heat exchanger tube 3 and the lower header pipe 2, in order to provide the part for welding, it has a hollow in the vicinity. In addition, the shape etc. of the heat insulating material 14 are not specifically limited to these shapes.

  Further, the shape of the water shielding member 15 is shown in FIG. FIG. 5A is a plan view of the water shielding member 15, and FIG. 5B is a cross-sectional view taken along line V (B) -V (B) in FIG. 5A. Referring to FIGS. 5A and 5B, for example, five openings 15a are arranged in the water shielding member 15 in the longitudinal direction of the water shielding member 15 (left and right in FIG. 5A). It is formed with. When there are a plurality of openings 15 a, it is possible to shield the portion where the plurality of heat transfer tubes 3 penetrate the heat insulating material with a single water shielding member 15. The diameter of the opening 15 a is substantially the same as the outer diameter of the heat transfer tube 3 or φA shown in FIG. 5 is 0 mm to 6 mm larger than the outer diameter of the heat transfer tube 3, and φB shown in FIG. 0 mm to 6 mm smaller. Thereby, the close contact between the water shielding member 15 and the heat transfer pipe 3 becomes stronger, and the inflow of the refrigerant into the lower header pipe 2 can be more reliably prevented. Further, the two water shielding members 15 are arranged so as to be shifted from each other in the extending direction of the lower header pipe 2 and stacked. When the two water-impervious members 15 are stacked, it is possible to more reliably prevent the refrigerant from flowing into the lower header pipe 2, and the water-impervious member 15 can be easily attached and detached.

  5A and 5B, the water-impervious member 15 has an outer periphery (see FIG. 5) from a part of the opening 15a (the uppermost part of the opening 15a in FIG. 5A). 5 (A) has a cutting portion 15b extending to the end in the vertical direction). Since five openings 15a are formed, five cut portions 15b are also formed. The openings 15a are formed side by side, and the cut portions 15b are parallel to each other. By providing a plurality of openings 15a and cutting portions 15b in parallel, the water shielding member 15 can be easily attached and detached, and the time required to attach and detach the water shielding member 15 can be reduced. In the first embodiment, five openings 15a are formed, but the present invention is not particularly limited to this. From the viewpoint of ease of handling, for example, it is preferable that 2 to 8 openings are formed in the water shielding member 15.

  Furthermore, a member for binding the lower header pipe 2, the heat insulating material 14, and the water shielding member 15 on the surface of the water shielding member 15 may be provided. FIG. 6 is an enlarged side view showing a state in which a portion to be bound is further provided in a portion where the lower header pipe and the heat transfer pipe are connected. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. With reference to FIGS. 6 and 7, the member 16 to be bound is bound to the lower header pipe 2, the heat insulating material 14, and the water shielding member 15 from the surface of the water shielding member 15 while the heat transfer tube 3 is interposed. To do. The material of the member 16 to be bound includes at least one selected from the group consisting of nylon, fluororesin, polypropylene, polyacetal, and polyethylene. In Embodiment 1, Insulok (registered trademark) manufactured by Tighton Co., Ltd. is used as the member 16 to be bound. Even if there is no member 16 to be bound, the heat insulating material 14 is not dropped by the refrigerant by sticking with the adhesive tape. Further, since the water shielding member 15 is connected to the opening 15a and the heat transfer tube 3, it does not fall off due to the refrigerant. Therefore, when the member 16 to be bound is tightly bound, the heat insulating material 14 or the water shielding member 15 can be prevented from dropping off from the refrigerant. In a portion where there is no member 16 to be bound, the cross-sectional view thereof is the same as the cross-sectional view of FIG.

  Next, a method for attaching and detaching the water shielding member 15 will be described. FIG. 8 is a schematic view showing a method for attaching and detaching the water shielding member 15. With reference to FIG. 8, the method to attach the water-impervious member 15 to the heat transfer tube 3 will be described. First, the water shielding member 15 is prepared on the surface of the heat insulating material 14 formed on the surface of the lower header tube 2 and at a position where the cut portion 15 b of the water shielding member 15 faces the heat transfer tube 3. Next, the opposing portions in the cut portion 15b of the water-impervious member 15 are twisted to sandwich the heat transfer tube 3 and lead to the opening 15a. And if all the opening parts 15a are inserted in the heat exchanger tube 3, the heat exchanger tube 3 will be inserted in the opening part 15a.

  The method of removing the water shielding member 15 from the heat transfer tube 3 is the reverse of the method of attaching the water shielding member 15 to the heat transfer tube 3. That is, the opposing portions of the cutting portion 15b are twisted to widen the opening 15a. And the water shielding member 15 is removed from the heat exchanger tube 3 through the cutting part 15b.

  Next, the material of the water shielding member 15 will be described. Silicone is used as the material of the water shielding member 15. Conventionally, the serviceable temperature range of silicone has been known to be −50 ° C. to 200 ° C., but it has not been known whether it has durability in an extremely cold temperature range of −50 ° C. or less. Therefore, a test was conducted to determine whether the silicone is durable in an extremely cold temperature range. FIG. 9 is a schematic diagram showing a silicone durability exposure test.

  Referring to FIG. 9, the silicone sample piece 25 was held by the sandwiching member 21, LNG was injected into the beaker 20, and immersed in LNG for 10 minutes. Meanwhile, the sample piece 25 was expanded and contracted using the clamping member 21. Then, the sample piece 25 was taken out from the beaker 20 using the clamping member. The progress of the state of the sample piece 25 and the sample piece 25 taken out while being immersed in LNG was observed. As a result, the sample piece 25 and the sample piece 25 taken out while being immersed in LNG did not change from the silicone state at room temperature. Note that LNG is an extremely cold liquid of about −164 ° C.

  Therefore, it was found that silicone is durable even in an extremely low temperature environment. Therefore, the use of silicone for the water shielding member 15 can prevent the refrigerant from reaching the surface of the lower header pipe 2 at a low cost. Therefore, the material of the water shielding member 15 in the first embodiment is silicone.

  Next, heat exchange of the open rack type vaporizer 1 will be described. 1-4, the liquefied gas 11 is introduce | transduced from the inlet_port | entrance of the liquefied gas supply member 7, and flows sequentially into the lower header pipe | tube 2 and the heat exchanger tube 3 (from the bottom to the top in FIGS. 1-4). On the other hand, a refrigerant (not shown) is introduced from the inlet of the refrigerant supply member 5. And a refrigerant | coolant is guide | induced to the refrigerant sprinkling trough 6, overflows from the refrigerant sprinkling trough 6, and flows along the outer surface of the heat exchanger tube 3 (from the top to the bottom in FIGS. 1-4). Thereby, the liquefied gas 11 inside the heat transfer tube 3 and the refrigerant flowing on the outer surface of the heat transfer tube 3 exchange heat. Therefore, in the open rack type vaporizer 1, the liquefied gas 11 flowing inside the lower header pipe 2 is vaporized into a gaseous state when flowing through the heat transfer pipe 3, and the gas flows inside the upper header pipe 4. .

  When heat exchange is performed between the liquefied gas and the refrigerant, the refrigerant falls downward along the water shielding member 15, but the liquefied gas is formed in the lower header pipe 2 by the heat insulating material 14 and the water shielding member 15 described above. 11 will not vaporize. Further, the coolant does not reach the surface of the lower header pipe 2 due to the water shielding member 15 described above.

  Next, a verification test was conducted on the liquefied gas concentration phenomenon. About the gas which came out of the upper header pipe | tube of the open rack type vaporizer | carburetor 1 in this Embodiment 1, the calorie | heat amount was continuously measured for a fixed time using the Vibro gas analyzer (DG8 by Yokogawa Electric Corporation). Specifically, the open rack type vaporizer 1 is operated when the flow rate of the liquefied gas (LNG) is increased to 60 (ton / h) after operating for 3 hours at 15 (ton / h) in the open rack type vaporizer 1. The amount of heat at the outlet of the vessel 1 was measured. FIG. 10 is a diagram illustrating a result of a verification test on a liquefied gas concentration phenomenon in the open rack type vaporizer according to the first embodiment. In FIG. 10, the vertical axis indicates the amount of heat generated by gas combustion (unit: MJ) and the flow rate of liquefied gas (unit: ton / h), and the horizontal axis indicates elapsed time (unit: s).

  As shown in FIG. 10, for the gas in which the liquefied gas is vaporized by the open rack type vaporizer 1 in the first embodiment, even if the gas flow rate increases, the amount of heat at the outlet of the open rack type vaporizer 1 varies. There was no. From the fact that there is no change in the amount of heat, it can be seen that there is no change in the gas component due to the concentration phenomenon. By providing the water shielding member 15 in the first embodiment, the concentration phenomenon of the liquefied gas could be prevented.

  On the other hand, a demonstration test was similarly performed on an open rack type vaporizer that does not include the heat insulating material 14 and the water shielding member 15. The result is shown in FIG. FIG. 11 is a diagram showing the results of a verification test on the liquefied gas concentration phenomenon in an open rack type vaporizer that does not include the heat insulating material 14 and the water shielding member 15. In FIG. 11, the vertical axis indicates the amount of heat (unit: MJ) generated with gas combustion and the flow rate (unit: ton / h) of the liquefied gas, and the horizontal axis indicates the elapsed time (unit: s).

  As shown in FIG. 11, for the gas in which the liquefied gas is vaporized by the open rack type vaporizer that does not include the heat insulating material 14 and the water shielding member 15, when the flow rate of the liquefied gas increases, the liquefied gas flow rate becomes 25 (ton / H) to 30 (ton / h), the amount of heat increased or decreased at the outlet of the open rack type vaporizer. From the fact that the amount of heat has changed, it can be seen that the gas component has changed due to the concentration phenomenon.

  As described above, according to the open rack type vaporizer 1 in the first embodiment, the water shielding member 15 has the cut portion 15b extending from the opening 15a to the outer periphery of the water shielding member 15. Therefore, the water shielding member 15 can be attached and detached between the heat transfer pipe 3 and the heat insulating material 14 disposed on the lower header pipe 2 via the cutting portion 15b. Therefore, the water shielding member 15 can be easily attached and detached, and is excellent in convenience.

  The material of the water shielding member 15 is made of silicone. Silicone has extreme cold resistance. Therefore, even in an extremely low temperature environment such as liquefied gas, the water shielding member 15 can prevent the refrigerant from flowing into the surface of the lower header pipe 2 through the gap of the heat insulating material 14. Thus, heat exchange between the liquefied gas flowing in the lower header pipe 2 and the refrigerant can be suppressed. Therefore, it is possible to prevent the liquefied gas from being vaporized in the lower header pipe 2 and to prevent the occurrence of the liquefied gas concentration phenomenon.

  Next, a modification of the first embodiment will be described. 12A is a plan view showing a modification of the water shielding member 15 in Embodiment 1 of the present invention, and FIG. 12B is a line segment XII (B) -XII in FIG. 12A. It is sectional drawing in (B).

  With reference to FIG. 12, the structure of the water-impervious member 35 in the modified example basically includes the same structure as the water-impervious member 15 in the first embodiment, but the number of the openings 35a is two. However, it differs from the water-impervious member 15 shown in FIG. Specifically, the water-impervious member 35 has two openings 35a and a cutting part 35b.

  As described above, by forming the water shielding member 35 in the modified example into the above shape, the water shielding member 35 is disposed between the heat transfer pipe 3 and the heat insulating material 14 disposed on the lower header pipe 2. As the water-impervious member 35, it becomes easier to attach and detach.

(Embodiment 2)
FIG. 13 is an enlarged view of a portion where the lower header tube and the heat transfer tube constituting the open rack type vaporizer according to the second embodiment of the present invention are connected. 14 is a cross-sectional view taken along line XIV-XIV in FIG. Referring to FIGS. 13 and 14, the configuration of the open rack type vaporizer in the second embodiment is basically the same as that of the open rack type vaporizer 1 in the first embodiment of the present invention. The shape of the water shielding member 45 is different from that of the open rack type vaporizer 1 shown in FIGS.

  FIG. 15A is a plan view of the water-impervious member 45 in the second embodiment, and FIG. 15B is a side view of the water-impervious member 45. Referring to FIGS. 15A and 15B, the water shielding member 45 has two openings 45a and two cut portions 45b. The opening 45 a is formed side by side at a substantially half position in the longitudinal direction of the water shielding member 45. The cutting portion 45b extends from a part of the opening 45a (the left and right portions of the opening 45a in FIG. 15A) to the outer periphery of the water shielding member 45 (the end in the left-right direction in FIG. 15A). It extends in parallel. When attaching and detaching the water shielding member 45, the opening 45a is attached to or removed from the heat transfer tube 3 through the cutting part 45b. Moreover, when the water-impervious member 45 is inserted into the heat transfer tube 3, the left and right shapes are substantially the same through the heat transfer tube 3 as shown in FIG.

  FIG. 16 is a side view further including a member to be tied in the open rack type vaporizer according to the second embodiment. FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. With reference to FIGS. 16 and 17, the lower header pipe 2, the heat insulating material 14, and the member 16 for binding the water shielding member 45 may be further provided on the surface of the water shielding member 45. In this case, the same effect as described in FIGS. 6 and 7 can be obtained.

  As described above, according to the open rack type vaporizer according to the second embodiment, the two water shielding members 45 are formed with the opening 45a aligned in the center in the longitudinal direction, and the cutting portion 45b is short from the opening 45a. There are two parallel to the hand direction. Therefore, since the water shielding member 45 can be easily attached and detached, it is excellent in convenience.

  Further, the water shielding member 45 can prevent the refrigerant from flowing into the surface of the lower header pipe 2 through the gap of the heat insulating material 14. Therefore, heat exchange between the liquefied gas flowing in the lower header pipe 2 and the refrigerant can be suppressed by the heat insulating material 14. Therefore, it is possible to prevent the liquefied gas from being vaporized in the lower header pipe 2 and to prevent the concentration of the liquefied gas from occurring.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

It is a schematic perspective view which shows the open rack type vaporizer | carburetor in Embodiment 1 of this invention. It is a schematic diagram which shows the state which liquefied gas vaporizes. It is an enlarged side view of the part to which the lower header pipe and the heat transfer pipe are connected. It is sectional drawing in line segment IV-IV in FIG. (A) is a top view of a water-impervious member, (B) is sectional drawing in line segment V (B) -V (B) in (A). It is an enlarged side view which shows the state further provided with the member to bind in the part to which the lower header pipe | tube and the heat exchanger tube are connected. It is sectional drawing in line segment VII-VII in FIG. It is a schematic diagram which shows the attachment / detachment method of a water-impervious member. It is a schematic diagram which shows the exposure test of the durability of silicone. It is a figure which shows the result of the verification test about the concentration phenomenon of the liquefied gas in the open rack type vaporizer | carburetor in Embodiment 1. FIG. It is a figure which shows the result of the verification test about the concentration phenomenon of the liquefied gas in the open rack type vaporizer which is not provided with the water-impervious member and the heat insulating material. (A) is a top view which shows the modification of the water-impervious member 15 in Embodiment 1 of this invention, (B) is line segment XII (B) -XII (B) in FIG. 12 (A). FIG. It is an enlarged view of the part to which the lower header pipe | tube and heat exchanger tube which comprise the open rack type vaporizer | carburetor in Embodiment 2 of this invention are connected. It is sectional drawing in line segment XIV-XIV in FIG. (A) is a top view of the water-impervious member in Embodiment 2, (B) is a side view of the water-impervious member 45. FIG. In the open rack type vaporizer | carburetor in Embodiment 2, it is a side view further provided with the member to bind. It is sectional drawing in line segment XVII-XVII in FIG. It is a schematic diagram in which a refrigerant | coolant and liquefied gas exchange heat. It is an expansion perspective view near a refrigerant sprinkling trough. It is sectional drawing of the open rack type vaporizer disclosed by patent document 1. FIG.

Explanation of symbols

  1,200 Open rack type vaporizer, 2,102 Lower header tube, 3,103 Heat transfer tube, 4,104 Upper header tube, 5 Refrigerant supply member, 6,106 Refrigerant sprinkling trough, 7 Liquefied gas supply member, 11 Liquefied gas , 14 Heat insulating material, 15, 35, 45 Water shielding member, 15a, 35a, 45a Opening portion, 15b, 35b, 45b Cutting portion, 16 Tightening member, 20 Beaker, 21 Holding member, 25 Sample piece, 204 Lower header, 208 heat exchange tube, 222,224 heat insulator, 226 drainage opening, 230,232 protective seal sheet.

Claims (8)

A lower header pipe into which liquefied gas flows,
An upper header pipe through which the gas obtained by vaporizing the liquefied gas flows out;
A heat transfer tube connecting the lower header tube and the upper header tube;
A heat insulating material formed on the surface of the lower header tube;
A water-impervious member formed on the surface of the heat insulating material in a state where an opening is formed and the heat transfer tube is inserted into the opening;
In order to vaporize the liquefied gas, a refrigerant supply member for supplying a refrigerant for heat exchange with the liquefied gas to the outside of the heat transfer tube,
The said water shielding member is an open rack type vaporizer which has the cutting part extended from the said opening part to the outer periphery of the said water shielding member.   The open rack type vaporizer according to claim 1, wherein a material of the water shielding member is made of silicone. A lower header pipe into which liquefied gas flows,
An upper header pipe through which the gas obtained by vaporizing the liquefied gas flows out;
A heat transfer tube connecting the lower header tube and the upper header tube;
A heat insulating material formed on the surface of the lower header tube;
A water-impervious member formed on the surface of the heat insulating material in a state where an opening is formed and the heat transfer tube is inserted into the opening;
In order to vaporize the liquefied gas, a refrigerant supply member for supplying a refrigerant for heat exchange with the liquefied gas to the outside of the heat transfer tube,
An open rack type vaporizer, wherein the material of the water shielding portion is made of silicone.   The open rack type vaporizer of any one of Claims 1-3 whose material of the said heat insulating material is a foaming material.   The open rack type vaporizer according to claim 4, wherein the foam material is a rigid urethane foam of carbon dioxide gas foam.   The open rack type vaporizer according to any one of claims 1 to 5, further comprising a member for binding the lower header pipe, the heat insulating material, and the water shielding member on a surface of the water shielding member. .   The open rack type vaporizer according to claim 6, wherein a material of the binding member includes at least one selected from the group consisting of nylon, fluororesin, polypropylene, polyacetal, and polyethylene.   The open rack type vaporizer according to claim 6 or 7, wherein the member to be bound is a detachable band.

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