JP6296306B2 - Heat exchanger and hydrogen gas cooling device - Google Patents

Description

  The present invention includes a plurality of heat transfer coils each having a tubular body wound portion in which a tubular body capable of passing hydrogen gas is spirally wound, and each tube is formed in a cylindrical shape so as to allow passage of a heat transfer fluid. The present invention relates to a heat exchanger for cooling a hydrogen gas configured to include a container body in which a heat transfer coil is accommodated, and a hydrogen gas cooling device configured to include such a heat exchanger.

  As this type of heat exchanger, the applicant discloses the invention of a hydrogen gas cooling heat exchanger and a hydrogen gas cooling device (hereinafter also simply referred to as “heat exchanger” and “cooling device”) in the following prior application. doing. In this case, the heat exchanger of the cooling device disclosed by the applicant includes a gas tank in which four outer heat transfer coils and four inner heat transfer coils through which hydrogen gas can pass are housed in a cylindrical container. The hydrogen gas that is allowed to flow toward the air supply target through the dispenser can be cooled by heat exchange with the brine (heat medium liquid) in the container. In this heat exchanger, the hydrogen gas introduced from the dispenser into the hydrogen gas introduction part is heat-exchanged with the brine in a state where the hydrogen gas is branched into four hydrogen gas flow paths, and then merged into one to produce hydrogen gas. A configuration is employed in which air is supplied to the air supply target from the discharge unit.

  In this case, each hydrogen gas flow path is connected from the hydrogen gas introduction part (part connected to the dispenser) to the hydrogen gas pipe (pipe made up of a connecting pipe and a branch fitting), an outer coil connecting part. (Fitting: Connection fitting), Outer heat transfer coil, Outer coil connection (Fitting: Connection fitting), Hydrogen gas pipe (Connection pipe), Inner coil connection (Fitting: Connection fitting), Inner heat transfer coil, Inner coil To reach the hydrogen gas discharge part (part connected to the air supply target) via the connection part (joint: connection fitting) and hydrogen gas pipe (pipe made up of the connecting pipe and the joining fitting) Each is composed.

  In the cooling device provided with this heat exchanger, the brine cooled by the refrigeration circuit is introduced into the container body when hydrogen gas is charged into the air supply object (supply air), thereby causing the dispenser to flow toward the air supply object. The resulting hydrogen gas is heat exchanged with brine and cooled. Thereby, in this cooling device, as a result of sufficiently reducing the temperature of the hydrogen gas whose temperature rises due to the Joule-Thompson effect, it is possible to sufficiently improve the charging efficiency of the hydrogen gas into the air supply target. .

Prior application 1

  Japanese Patent Application No. 2016-5817

  However, the heat exchanger disclosed by the applicant and the cooling device including the heat exchanger have the following problems to be improved. That is, in the heat exchanger disclosed by the applicant, the hydrogen gas that allows the hydrogen gas to be cooled to pass by connecting the outer heat transfer coil, the connecting pipe, and the inner heat transfer coil together by a joint (connecting bracket). A flow path is configured.

  In this case, in the heat exchanger disclosed by the applicant, when manufacturing each heat transfer coil and connection pipe, work is performed so that the end of the tube body is not damaged or deformed, and the heat exchanger coil is assembled. However, it is possible to prevent hydrogen gas from leaking out from the connection part by strictly controlling the tightening torque of the joint while avoiding the adhesion of foreign substances to the connection part (the end of the tube and the joint) and the occurrence of scratches. It is surely prevented. However, when excessive vibration or impact is applied to the heat exchanger at the installation site of the cooling device, there may be a gap between the joint (connecting bracket) and the pipe, and hydrogen gas may leak out. There is. For this reason, it is preferable to improve this point.

  In addition, among the components of the hydrogen gas cooling system, for parts that come into contact with high-pressure fluid such as hydrogen gas, it is necessary to test whether the safety is ensured and to use parts that meet the standards. It is necessary to apply for presentation. For this reason, the joint (joint which comprises a part of hydrogen gas flow path) which can be used for the heat exchanger for hydrogen gas cooling is very expensive. Therefore, in the heat exchanger disclosed by the applicant, it is difficult to reduce the manufacturing cost due to the component cost of the joint. Therefore, it is preferable to improve this point.

  Further, in the heat exchanger disclosed by the applicant, the outer heat transfer coil and the inner heat transfer coil are respectively manufactured by bending a long tube body. In this case, a sufficient length of tube is required when manufacturing a heat transfer coil having a tube winding portion with a large number of turns of a tube or a tube winding portion having a large winding diameter. A body is needed.

  On the other hand, long tubular bodies are distributed on the market in the form of scrolls in order to save space occupied during storage and transportation. Therefore, when manufacturing a heat transfer coil using a long tubular body, before bending the tubular body into a desired shape, the rolled tubular body is bent back into a straight line and then heat-treated. Thus, a pre-treatment for removing the internal stress to return to the scroll state is required. As a result, the number of man-hours for manufacturing is increased by the amount of pre-processing performed prior to bending, and equipment for pre-processing is also required, so it is difficult to reduce the manufacturing cost. It is preferable to improve the point.

  The present invention has been made in view of such a problem to be improved, and mainly aims to provide a heat exchanger and a hydrogen gas cooling device capable of reliably avoiding leakage of hydrogen gas while reducing the manufacturing cost. Objective.

In order to achieve the above object, the heat exchanger according to claim 1 includes a heat transfer coil having a tube winding portion in which a tube capable of passing hydrogen gas is spirally wound, and a heat transfer fluid A heat exchanger that is formed in a cylindrical shape so as to be able to pass through and in which the heat transfer coil is housed, and in which the hydrogen gas and the heat transfer fluid are configured to exchange heat with each other in the container body. A hydrogen gas flow path in which a plurality of the heat transfer coils are connected via a connection portion formed of the tubular body and the hydrogen gas can pass therethrough, and the hydrogen gas flow path The one end portion to the other end portion of the pipe are integrally formed by the plurality of pipe bodies connected to each other by end face welding, and are connected by the end face welding in the pipe bodies constituting the hydrogen gas flow path. The part is formed linearly .

The heat exchanger of claim 2, in the heat exchanger according to claim 1, wherein the heat transfer coils, the winding shape of the tubular body winding portion is formed in a polygonal shape.

Hydrogen gas cooling apparatus according to the third aspect, a heat exchanger according to claim 1, and a refrigeration circuit for cooling the heat transfer fluid, the hydrogen gas and the heat transfer fluid cooled by the refrigeration circuit In the heat exchanger so that the hydrogen gas can be cooled.

In the heat exchanger according to claim 1, a plurality of heat transfer coils are connected via a connecting portion to form a hydrogen gas flow path, and an end surface from one end to the other end of the hydrogen gas flow path is formed. It is comprised integrally by the several pipe body mutually connected by welding. According to a third aspect of the present invention, the hydrogen gas cooling apparatus includes the heat exchanger and a refrigeration circuit that cools the heat medium liquid so that the hydrogen gas can be cooled.

Therefore, according to the heat exchanger according to claim 1 and the hydrogen gas cooling device according to claim 3, a state in which hydrogen gas leaks from a connection portion between both the heat transfer coils and the connection portion due to vibration or impact. The manufacturing cost can be sufficiently reduced by the amount that the hydrogen gas flow path is configured without using a joint (connection fitting). In addition, the hydrogen gas flow path can be manufactured using a short tube body without using the long tube body that is distributed in the market in the form of a roll, so the pretreatment prior to bending is performed. The manufacturing cost can be further reduced by the amount that is unnecessary.

In addition, since the connecting parts by end face welding in each pipe constituting the hydrogen gas flow path are formed in a straight line, unnecessary external force (force applied during bending) is not applied to the connecting parts connected by end face welding. For this reason, it is possible to more suitably avoid the hydrogen gas leaking from the connection portion due to vibration or impact.

According to the heat exchanger according to claim 2 and the hydrogen gas cooling device provided with such a heat exchanger, the winding of the tube winding part of the heat transfer coil is made into a polygonal shape, so that the tube winding Since there are many straight parts in the turn part, when it is necessary to configure the pipe winding part with a plurality of pipes, the pipe parts are connected by end face welding in this straight part. As a result of being able to manufacture a tube winding part where unnecessary external force (force applied during bending) is not applied to the part, hydrogen gas leaks from the connected part due to vibration and impact. It can avoid suitably.

It is a block diagram which shows the structure of the hydrogen gas supply system 100 which concerns on embodiment of this invention. It is a vertical sectional view of heat exchanger 30 for cooling a hydrogen gas according to an embodiment of the present invention. It is a horizontal sectional view of heat exchanger 30 for hydrogen gas cooling concerning an embodiment of the invention. It is a side view of the inner side heat transfer coil 60i and the outer side heat transfer coil 60o in the heat exchanger 30 for hydrogen gas cooling which concerns on embodiment of this invention. FIG. 3 is a vertical sectional view of the vicinity of a through metal fitting 46 in the hydrogen gas cooling heat exchanger 30 according to the embodiment of the present invention.

  Hereinafter, embodiments of a heat exchanger and a hydrogen gas cooling device will be described with reference to the accompanying drawings.

  First, configurations of the heat exchanger 30 for cooling hydrogen gas and the hydrogen gas cooling device 1 will be described with reference to the accompanying drawings.

  A hydrogen gas supply system 100 shown in FIG. 1 is a facility for a hydrogen gas station that supplies hydrogen gas to an air supply target X such as a hydrogen gas fuel cell vehicle, and includes a hydrogen gas cooling device 1, a gas tank 2, and a dispenser. 3 and so on. In the figure, in order to facilitate understanding of the hydrogen gas cooling device 1, regarding the components other than the hydrogen gas cooling device 1 in the hydrogen gas supply system 100, the gas tank 2, the dispenser 3, and the hydrogen gas pipes 4a to 4a. Only 4c is shown, and the other components are not shown.

  The hydrogen gas cooling device 1 is an example of a “hydrogen gas cooling device”, and includes a refrigeration circuit 11, a brine tank 12, brine pipes 13a to 13d, liquid feed pumps 14a and 14b, a control unit 15, and heat exchange for hydrogen gas cooling. And cooling the brine, which is an example of the “heat medium liquid”, and supplying the cooled brine to the heat exchanger 30 for cooling the hydrogen gas, so that the hydrogen gas is exchanged by heat exchange between the hydrogen gas and the brine. It is configured so that it can be cooled.

  The refrigeration circuit 11 is a unitary refrigeration circuit that is an example of a “refrigeration circuit”, and includes a compressor 21, a condenser 22, an expansion valve 23, and an evaporator 24. As will be described later, It is comprised so that a brine can be cooled by heat exchange with the brine as a "heat medium liquid". The actual refrigeration circuit 11 includes a sensor for detecting refrigerant pressure and refrigerant temperature in the circuit, various refrigerant bypass circuits, a reheat circuit, and lubricating oil discharged together with Freon from the compressor 21 as a compressor. Various components such as a lubricating oil pipe to be returned to 21 are arranged, but in order to facilitate understanding of the hydrogen gas cooling device 1, illustration and description of these components are omitted.

  As will be described later, the brine tank 12 is configured to be capable of storing brine that is cooled by the refrigeration circuit 11 (evaporator 24) and supplied to the heat exchanger 30 for cooling hydrogen gas. The brine pipes 13a and 13b connect the evaporator 24 of the refrigeration circuit 11 and the brine tank 12 to each other. In this case, in the hydrogen gas cooling device 1 of this example, the brine in the brine tank 12 is supplied to the evaporator 24 via the brine pipe 13a and cooled, and then guided to the brine tank 12 via the brine pipe 13b. Thus, a configuration in which the brine is circulated between the brine tank 12 and the evaporator 24 is employed.

  The brine pipes 13c and 13d connect the brine tank 12 and the hydrogen gas cooling heat exchanger 30 to each other. In this case, in the hydrogen gas cooling device 1 of the present example, the brine in the brine tank 12 is supplied to the hydrogen gas cooling heat exchanger 30 via the brine pipe 13c and heat-exchanged with hydrogen, and then the brine pipe 13d. The brine is circulated between the brine tank 12 and the hydrogen gas cooling heat exchanger 30 by being guided to the brine tank 12 via the.

  The liquid feed pump 14 a pumps the brine in the brine tank 12 toward the evaporator 24 under the control of the control unit 15. In this case, in the hydrogen gas cooling device 1 of this example, the liquid feed pump 14a pumps the brine in the brine tank 12 to the evaporator 24, so that the brine in the evaporator 24 (brine cooled in the evaporator 24). Is adopted that is guided to the brine tank 12.

  The liquid feed pump 14 b pressure-feeds the brine in the brine tank 12 toward the hydrogen gas cooling heat exchanger 30 according to the control of the control unit 15. In this case, in the hydrogen gas cooling device 1 of this example, the liquid feed pump 14b pressure-feeds the brine in the brine tank 12 to the hydrogen gas cooling heat exchanger 30, thereby the brine in the hydrogen gas cooling heat exchanger 30. Is adopted that is guided to the brine tank 12.

  Instead of the configuration of the hydrogen gas cooling device 1 described above, for example, the brine in the “liquid storage tank (brine tank)” is supplied to the refrigeration circuit 11 (evaporator 24) and cooled, and then the hydrogen gas cooling heat is supplied. While supplying hydrogen directly to the exchanger 30 to cool the hydrogen gas, it is also possible to arrange a “liquid storage tank” so as to collect the brine whose temperature has been raised by the cooling of the hydrogen gas in the “liquid storage tank” (not shown). ) In addition, when used in an environment where there is no possibility of continuously cooling a large amount of hydrogen gas, that is, an environment where it is not necessary to provide a large amount of brine, a “storage tank (brine tank)” is not required. A configuration in which brine is directly circulated between the refrigeration circuit 11 (evaporator 24) and the hydrogen gas cooling heat exchanger 30 can also be employed (not shown).

  The control unit 15 comprehensively controls the hydrogen gas cooling device 1. Specifically, the control unit 15 controls the compressor 21 of the refrigeration circuit 11 to execute the brine cooling process for cooling the brine by the refrigeration circuit 11 (evaporator 24), and is necessary and sufficient for cooling the brine. And the expansion valve 23 is controlled to supply the evaporator 24 with an amount of refrigerant necessary and sufficient for cooling the brine.

  In addition, the control unit 15 controls the liquid feed pump 14 a in parallel with the brine cooling process by the refrigeration circuit 11, thereby circulating the brine between the brine tank 12 and the evaporator 24, so that the brine in the brine tank 12 is Is maintained at a specified temperature (a temperature suitable for cooling hydrogen gas). Further, the control unit 15 is moved from the gas tank 2 toward the dispenser 3 by controlling the liquid feed pump 14b to circulate the brine between the brine tank 12 and the hydrogen gas cooling heat exchanger 30. The hydrogen gas is cooled by heat exchange with brine in the hydrogen gas cooling heat exchanger 30.

  On the other hand, the heat exchanger 30 for cooling the hydrogen gas is an example of a “heat exchanger”, and includes a container body 40 and a hydrogen gas pipe 50 as shown in FIG. 2, and the dispenser 3 via the hydrogen gas pipe 4b. And is connected to the air supply target X through the hydrogen gas pipe 4c and is connected to the brine tank 12 through the brine pipes 13c and 13d. This heat exchanger 30 for cooling a hydrogen gas has a temperature (predetermined by heat exchange with hydrogen) hydrogen gas that flows from the gas tank 2 through the hydrogen gas pipe 4a and the dispenser 3 toward the supply target X. As an example, the temperature is cooled to a temperature within a temperature range of −33 ° C. to −40 ° C. In this example, an example in which the hydrogen gas cooling heat exchanger 30 is provided as a constituent element of the hydrogen gas cooling device 1 will be described. However, the hydrogen gas cooling heat exchanger 30 is an external device that is a “hydrogen gas cooling device”. It can also be used by connecting to.

  The container body 40 corresponds to a “container body”, and as an example, a cylindrical tubular portion 41, a lid portion 42 b that closes a lower end portion of the tubular portion 41, and an upper end portion of the tubular portion 41 are closed. A lid 42t, a brine introduction part 43 for introducing brine into the heat exchange processing space S formed by the tubular part 41 and the lid parts 42b, 42t, and a brine discharge part 44 for discharging the brine from the heat exchange processing space S. And a speed increasing shaft 45 for increasing the flow rate of the brine in the heat exchange processing space S. Further, penetrating metal fittings 46, 46,... For penetrating the hydrogen gas pipe 50 are attached to the lid portion 42t.

  In this case, the brine introduction part 43 is connected to the brine discharge port of the brine tank 12 via the brine pipe 13c. Moreover, the brine discharge part 44 is connected to the brine inflow port of the brine tank 12 via the brine piping 13d. Thereby, in the hydrogen gas cooling heat exchanger 30 of the present example, the brine supplied through the brine pipe 13c is ejected from the brine introduction part 43 into the heat exchange processing space S, and the heat exchange processing of the container body 40 is performed. After being moved upward in the space S, it is caused to flow from the brine discharge portion 44 into the brine tank 12 via the brine pipe 13d.

  The hydrogen gas pipe 50 is a pipe constituting a “hydrogen gas flow path”, and an inner heat transfer coil 60 i and an outer heat transfer coil 60 o (an example of “a plurality of heat transfer coils”) are connected to a connecting portion 60 c (“tube body”). The hydrogen gas introduction part 51a ("one end part in the hydrogen gas flow path") is connected to each other by an example) and introduces a hydrogen gas to be cooled to the hydrogen gas cooling heat exchanger 30. ”) To a hydrogen gas discharge portion 51b (an example of“ the other end portion in the hydrogen gas flow path ”) that discharges the hydrogen gas that has been cooled. (An example of a configuration that “a plurality of heat transfer coils are connected via a connecting portion”). In this case, a hydrogen gas pipe 4b is connected to the hydrogen gas introduction part 51a in the hydrogen gas pipe 50 via the connection fitting F4, and a hydrogen gas pipe 4c is connected to the hydrogen gas discharge part 51b via the connection fitting F4. Is connected.

  As shown in FIGS. 2 and 4, the inner heat transfer coil 60 i has one end portion (upper end portion) falling linear portion 61 i constituting the hydrogen gas introduction portion 51 a and one end portion (upper end portion) falling linear. The tubular body winding portion 62i connected to the lower end portion of the shaped portion 61i, and one end portion (lower end portion) are connected to the lower end portion of the tubular body winding portion 62i, and the other end portion (upper end portion) is the connecting portion. A rising straight portion 63i connected to 60c is provided. In this case, as shown in FIG. 3, the tubular body winding portion 62 i has a tubular body wound spirally, and is provided with curved portions 65 ci and linear portions 65 si alternately. It is formed in a shape (substantially rounded quadrilateral) (an example of a configuration in which “the winding shape is a polygonal shape”).

  Further, as shown in FIGS. 2 and 4, the outer heat transfer coil 60 o has a falling linear portion 61 o whose one end (upper end) is connected to the connecting portion 60 c, and one end (upper end) is a falling straight line. The tubular body winding portion 62o connected to the lower end portion of the shaped portion 61o, and one end portion (lower end portion) are connected to the lower end portion of the tubular body winding portion 62o, and the other end portion (upper end portion) is hydrogen gas. A rising straight portion 63o constituting the discharge portion 51b is provided. In this case, as shown in FIG. 3, the tubular body winding portion 62o is formed by spirally winding the tubular body and alternately providing curved portions 65co and linear portions 65so. It is formed in a shape (substantially rounded quadrilateral) (an example of a configuration in which “the winding shape is a polygonal shape”).

  In the hydrogen gas cooling heat exchanger 30 of this example, as shown in FIG. 2, the winding direction of the tube winding portions 62 i and 62 o is along the tube length direction of the container body 40, so that the inner transmission is performed. The heat coil 60 i and the outer heat transfer coil 60 o are accommodated in the container body 40. Further, in the heat exchanger 30 for cooling hydrogen gas of this example, the tube winding part 62o of the outer heat transfer coil 60o is formed to have a larger diameter than the tube winding part 62i of the inner heat transfer coil 60i. The outer heat transfer coil 60o and the inner heat transfer coil 60i are accommodated in the container body 40 so that the tube winding part 62i of the inner heat transfer coil 60i is positioned inside the tube winding part 62o of the heat coil 60o. Yes.

  In this case, in the heat exchanger 30 for cooling the hydrogen gas of this example, between the hydrogen gas introduction part 51a and the hydrogen gas discharge part 51b of the hydrogen gas pipe 50 (the inner heat transfer coil 60i, the connecting part 60c and the outer heat transfer coil). 60o) is integrally formed of a plurality of pipes connected to each other by end face welding. Further, in the hydrogen gas cooling heat exchanger 30 of the present example, the connecting portions by end face welding in the respective pipe bodies constituting the hydrogen gas pipe 50 are formed in a straight line.

  In this hydrogen gas pipe 50, as will be described later, an inner heat transfer coil 60i, an outer heat transfer coil 60o, and a connecting portion 60c are separately manufactured, and these are connected to each other by end face welding and integrated. . In this example, as an example, one hydrogen gas pipe 50 is formed by connecting a plurality of short pipes of about 2 m to 4 m by end face welding.

  Next, the manufacturing method of the heat exchanger 30 for cooling hydrogen gas will be described.

  First, the inner heat transfer coil 60i, the outer heat transfer coil 60o, and the connecting portion 60c are manufactured. In this case, in the hydrogen gas cooling heat exchanger 30 of this example, since the number of turns of the tube winding parts 62i and 62o in the inner heat transfer coil 60i and the outer heat transfer coil 60o is large, the inner tube is formed with one tube. When the heat transfer coil 60i is formed or the outer heat transfer coil 60o is formed with a single tube, a long tube is required.

  Therefore, when manufacturing the inner heat transfer coil 60i, as an example, the falling linear portion 61i and the upper winding portion 62ia (see FIG. 4) of the tube winding portion 62i are configured by one tube. In addition, the lower winding portion 62ib (see FIG. 4) of the tubular body winding portion 62i is constituted by another one tubular body, and the rising straight portion 63i is further constituted by another one tubular body. These are integrated by connecting each other by end face welding.

  Specifically, the tubular body constituting the falling linear portion 61i and the upper winding portion 62ia is set in a bending apparatus (pipe bender), and a portion to be the falling linear portion 61i is secured to wind the tubular body. Production of the turning part 62i is started. At this time, the bending apparatus manufactures the upper winding part 62ia in the tubular body winding part 62i by alternately forming the curved part 65ci and the linear part 65si according to preset processing information. Further, when the processing proceeds to the vicinity of the end of the tube, the bending apparatus is stopped, and the tube for manufacturing the lower winding portion 62ib is end-welded to the tube being processed.

  Next, the bending apparatus is restarted, and an unmanufactured portion of the upper winding portion 62ia and a lower winding portion 62ib are sequentially manufactured. Thereby, the first tubular body (the tubular body constituting the falling linear portion 61i and the upper winding portion 62ia) and the tubular body constituting the lower winding portion 62ib are welded at P1i shown in FIG. The tube winding part 62i is manufactured in a welded state. In this case, the length of each of the two pipe bodies is adjusted in advance so that the welding spot P1i is positioned at the linear portion 65si of the pipe winding portion 62i. Thereby, the tube winding part 62i is manufactured without bending the welded part P1i, and the intermediate body in which the falling linear part 61i and the tube winding part 62i are connected is completed.

  Subsequently, the pipe constituting the rising straight part 63i is end-welded to the pipe winding part 62i in the intermediate body. Thereby, the tubular body constituting the lower winding portion 62ib and the tubular body constituting the rising straight portion 63i are welded at the welding point P2i shown in FIG. In this case, the pipe constituting the lower winding portion 62ib has a welded portion P2i with the rising linear portion 63i at the linear portion (within the range of the broken line L2i shown in the figure) in the hydrogen gas pipe 50. The length is adjusted in advance so as to be positioned. Thereby, the inner side heat transfer coil 60i is manufactured, without bending the welding location P2i.

  Further, when manufacturing the outer heat transfer coil 60o, as an example, the falling linear portion 61o and the upper winding portion 62oa (see FIG. 4) in the tube winding portion 62o are configured by one tube. The lower winding portion 62ob (see FIG. 4) in the tubular body winding portion 62o is constituted by another one tubular body, and the rising straight portion 63o is further constituted by another one tubular body. These are integrated by connecting each other by end face welding. The manufacturing process of the outer heat transfer coil 60o is the same as the manufacturing process of the inner heat transfer coil 60i, and a detailed description thereof will be omitted.

  In this outer heat transfer coil 60o, the first tubular body (the tubular body constituting the falling linear portion 61o and the upper winding portion 62oa) and the tubular body constituting the lower winding portion 62ob are shown in FIG. The tubular body winding portion 62o is manufactured in a state where it is welded at the welding spot P1o shown. In this case, the lengths of the two pipes are adjusted in advance so that the welding spot P1o is positioned at the linear part 65so in the pipe winding part 62o. Thereby, in this outer side heat transfer coil 60o, the tube winding part 62o is manufactured, without bending the welding location P1o.

  Moreover, in this outer side heat transfer coil 60o, the pipe body which comprises the lower side winding part 62ob and the pipe body which comprises the rising linear part 63o will be in the state welded in the welding location P2o shown in FIG. ing. In this case, the pipe constituting the lower winding portion 62ob has a welded portion P2o with the rising linear portion 63o at the linear portion (within the range of the broken line L2o shown in the figure) in the hydrogen gas pipe 50. The length is adjusted in advance so as to be positioned. Thereby, in this outer side heat transfer coil 60o, it is manufactured, without bending the welding location P2o.

  Next, the inner heat transfer coil 60i and the outer heat transfer coil 60o are connected by the connecting portion 60c. Specifically, the through metal fitting 46 is attached to the lid portion 42t of the container body 40, and the inner heat transfer coil 60i and the outer heat transfer coil 60o are assembled to the lid portion 42t so as to penetrate the attached through metal fitting 46.

  In this case, as shown in FIG. 5, the through metal fitting 46 is a pipe insertion metal fitting, and includes a base 71, a tightening portion 72, and a sealing material 73. In addition, the base 71 has an insertion hole H71a slightly larger than the outer diameter of the tube to be penetrated (inserted) (in this example, the tube constituting the hydrogen gas pipe 50), and a fastening hole. A screw hole H71b through which the insertion portion 72 can be screwed is formed in communication, and a thread that can be screwed into the insertion hole H42 formed in the lid portion 42t is formed on the outer peripheral surface.

  Further, the tightening portion 72 has a diameter slightly larger than the outer diameter of the pipe body to be penetrated (inserted) (in this example, the pipe body constituting the hydrogen gas pipe 50), and the insertion hole. An insertion hole H72 having the same diameter as H71a is formed, and a thread that can be screwed into the screw hole H71b of the base 71 is formed on the outer peripheral surface. The sealing material 73 is formed in an annular shape from a corrosion-resistant material that can be deformed by compression by screwing the tightening portion 72 into the base portion 71 (screw hole H71b).

  When the inner heat transfer coil 60i and the outer heat transfer coil 60o are assembled to the lid 42t, first, the falling linear portions 61i and 61o and the rising linear portion 63i of the inner heat transfer coil 60i and the outer heat transfer coil 60o are firstly used. , 63o, and the base 71 of the through metal fitting 46 is screwed into the four insertion holes H42 formed at positions where the through holes 63o should be penetrated. Next, falling linear portions 61i, 61o and rising linear portions 63i, 63o are inserted into the insertion holes H71a and screw holes H71b of the base portions 71 from the back side of the lid portion 42t (the side that will later become the heat exchange processing space S). Each of them is inserted, and its tip part is protruded largely to the surface side (upper surface side) of the lid part 42t.

  Subsequently, the sealing material 73 and the tightening portion 72 are respectively attached in this order to the projecting falling linear portions 61i and 61o and the rising linear portions 63i and 63o, and the sealing material 73 is fitted into the screw hole H71b. After that, the tightening portion 72 is lightly screwed into the screw hole H71b so that the fitted sealing material 73 is not deformed. At this time, the falling linear portions 61i and 61o and the rising linear portions 63i and 63o are slidable in the directions of arrows U and D with respect to the lid portion 42t (through metal fitting 46).

  Next, the fittings F4 are respectively attached to the falling linear part 61i and the rising linear part 63o. In addition, about the mounting | wearing operation | work of this connection metal fitting F4, it can also carry out after completion of the connection operation | work of the inner side heat transfer coil 60i and the outer side heat transfer coil 60o demonstrated below.

  Subsequently, the rising linear portion 63i and the falling linear portion 61o are connected by the connecting portion 60c. Specifically, one end of the tube constituting the connecting portion 60c is end-face welded to the rising straight portion 63i, and the other end of the tube constituting the connecting portion 60c is end-welded to the falling straight portion 61o. To do. As a result, the inner heat transfer coil 60i (rising linear portion 63i) and the connecting portion 60c are welded at the welding point P1a shown in FIG. 2, and the outer heat transfer coil 60o (falling linear portion 61o). And the connection part 60c will be in the state welded in the welding location P1b shown in FIG.

  In this case, the connecting portion 60c is previously bent into a U shape. Further, the length of the tubular body constituting the rising straight portion 63i is adjusted in advance so that the welding point P1a is located at a straight portion (within the range of the broken line L1i shown in the figure) in the hydrogen gas pipe 50. Has been. Further, the pipe constituting the falling straight portion 61o has a length in advance so that the welding spot P1b is located at a straight portion (within the range of the broken line L1o shown in the figure) in the hydrogen gas pipe 50. It has been adjusted. Accordingly, the inner heat transfer coil 60i and the outer heat transfer coil 60o can be connected and integrated with each other by the connecting portion 60c without bending the weld locations P1a and P1b.

  Next, after adjusting the positions of the tube winding portions 62i and 62o relative to the lid portion 42t by sliding the falling linear portions 61i and 61o and the rising linear portions 63i and 63o with respect to the lid portion 42t, each base portion The fastening portions 72 are fastened to 71 respectively. At this time, the sealing material 73 is deformed by tightening the tightening portion 72 with respect to the base portion 71, whereby the outer peripheral surfaces of the falling linear portions 61 i and 61 o and the rising linear portions 63 i and 63 o, the base portion 71 and The inner peripheral surface of the tightening portion 72 is sealed by the sealing material 73, and sliding to the arrows U and D is restricted, and the attachment of the inner heat transfer coil 60i and the outer heat transfer coil 60o to the lid portion 42t is completed. .

  Thereafter, the lid portion 42t is fixed to the upper end portion of the tubular portion 41 so that the inner heat transfer coil 60i and the outer heat transfer coil 60o are positioned inside the tubular portion 41. Note that the lid portion 42b, the brine introduction portion 43, and the brine discharge portion 44 are fixed in advance to the tubular portion 41, and the speed increasing shaft 45 is fixed in advance to the lid portion 42t. Thereby, as shown in FIG. 2, the heat exchanger 30 for cooling hydrogen gas is completed.

  The hydrogen gas cooling device 1 employs a configuration that cools the hydrogen gas when filling the air supply target X (supply air). Specifically, when charging hydrogen gas, for example, when a supply start signal is output from the main control device (not shown) of the hydrogen gas supply system 100 to the control unit 15 of the hydrogen gas cooling device 1. The control unit 15 controls the liquid feed pump 14b to supply brine from the brine tank 12 to the heat exchanger 30 for cooling hydrogen gas. As a result, the low-temperature brine that has been cooled in advance by the refrigeration circuit 11 and stored in the brine tank 12 is supplied to the hydrogen gas cooling heat exchanger 30 via the brine pipe 13c.

  As a result, the hydrogen gas that is moved from the gas tank 2 through the dispenser 3 toward the supply target X passes through the hydrogen gas piping 50 of the heat exchanger 30 for cooling the hydrogen gas and the brine in the heat exchange processing space S. Filled in the fuel tank (gas tank) of the supply target X with hydrogen gas (for example, hydrogen gas having a temperature in the temperature range of −33 ° C. to −40 ° C.) that is cooled by heat exchange and cooled sufficiently. Is done. Thereby, the filling efficiency of the hydrogen gas to the air supply target X can be sufficiently improved.

  Thus, in this hydrogen gas cooling heat exchanger 30, the inner heat transfer coil 60i and the outer heat transfer coil 60o are connected via the connecting portion 60c to form the "hydrogen gas flow path (hydrogen gas pipe 50)". In addition, the portion from the hydrogen gas introduction part 51a to the hydrogen gas discharge part 51b in the “hydrogen gas flow path” is integrally configured by a plurality of pipes connected to each other by end face welding. In addition, the hydrogen gas cooling device 1 includes the above-described heat exchanger 30 for cooling the hydrogen gas and the refrigeration circuit 11 that cools the brine as the “heat medium liquid” so that the hydrogen gas can be cooled. .

  Therefore, according to the heat exchanger 30 for cooling hydrogen gas and the hydrogen gas cooling device 1, hydrogen gas is generated from the connection portions of the inner heat transfer coil 60 i, the outer heat transfer coil 60 o, and the connection portion 60 c due to vibration and impact. Not only can it be suitably prevented from leaking, but the manufacturing cost can be sufficiently reduced by the amount of the hydrogen gas pipe 50 configured without using a joint (connection fitting). In addition, since the hydrogen gas pipe 50 can be manufactured using a short tube body without using a long tube body that is distributed in the market in the form of a scroll, pre-processing performed prior to bending The manufacturing cost can be further reduced by the amount that is unnecessary.

  Further, according to the heat exchanger 30 for hydrogen gas cooling and the hydrogen gas cooling device 1, the end portions of the pipes constituting the “hydrogen gas flow path” are connected by end face welding so that the end faces are welded. Since unnecessary external force (force applied at the time of bending) is not applied to the connected parts connected by the above, it is possible to more suitably avoid a state in which hydrogen gas leaks from the connected parts due to vibration or impact.

  Furthermore, according to the heat exchanger 30 for cooling hydrogen gas and the hydrogen gas cooling device 1, the winding shapes of the tube winding portions 62i and 62o in the inner heat transfer coil 60i and the outer heat transfer coil 60o are polygonal. By this, since there are a large number of linear portions 65si and 65so in the tubular body winding portions 62i and 62o, when the tubular body winding portions 62i and 62o need to be constituted by a plurality of tubular bodies, the linear portion 65si. , 65so, by connecting the pipes by end face welding, it is possible to manufacture the pipe winding parts 62i, 62o in which unnecessary external force (force applied during bending) is not applied to the connection part. It can be suitably avoided that hydrogen gas leaks from the connection site due to the impact.

  The configurations of the “heat exchanger” and the “hydrogen gas cooling device” are not limited to the configuration examples of the heat exchanger 30 for hydrogen gas cooling and the hydrogen gas cooling device 1 described above. For example, the example in which the “hydrogen gas flow path” is configured by one hydrogen gas pipe 50 from the hydrogen gas introduction part 51 a to the hydrogen gas discharge part 51 b has been described. However, a “branch part” is added to the hydrogen gas introduction part. A plurality of “hydrogen gas flow paths” can be provided in parallel between the “introducing portion” and the “discharging portion” by providing a “merging portion” in the “discharging portion” of the hydrogen gas. Not shown). Even when such a configuration is adopted, the above-described heat exchange for cooling the hydrogen gas is achieved by connecting the pipes constituting one end and the other end of each “hydrogen gas flow path” by end face welding. The same effect as the vessel 30 can be obtained.

  Further, the inner heat transfer coil 60i provided with the tubular body winding part 62i having a rectangular shape in plan view and the outer heat transfer coil 60o provided with the tubular body winding part 62o having a substantially rectangular shape in plan view are connected by a connecting part 60c. Although the configuration including the hydrogen gas pipe 50 has been described as an example, the winding shape of the “tubular winding portion” is not limited to the quadrangular shape described above, and may be any polygonal shape (triangular shape or pentagonal shape or more). Any polygonal shape). Further, when the “tubular winding portion” is not constituted by a plurality of tubular bodies, it can be formed in a circular shape in plan view or an elliptical shape in plan view. Furthermore, even when the “tubular winding part” is composed of a plurality of pipes, if the connecting part of the pipes is a straight line, the windings of other parts should have any shape other than a polygon. Can do.

  Further, the falling linear portion 61i and the upper winding portion 62ia are formed by a single pipe, and another pipe is end-welded to the pipe to form the lower winding portion 62ib. The inner heat transfer coil 60i formed by end-welding the rising linear portion 63i to the turning portion 62ib (tubular winding portion 62i), the falling linear portion 61o, and the upper winding portion 62oa are formed as one tube. Then, another pipe is end-welded to the pipe to form the lower winding part 62ob, and the rising straight part 63o is end-welded to the lower winding part 62ob (tube winding part 62o). Although the structure provided with the outer heat transfer coil 60o formed by doing is described, the falling linear part 61i is connected to the upper winding part 62ia (tubular winding part 62i) separately formed by end surface welding. Separately formed upper winding part 62oa (tubular winding part 62o) The falling linear part 61o is connected by end face welding, the lower winding part 62ib and the rising linear part 63i are formed with one tube, or the lower winding part 62ob and the rising linear part 63o It can also be formed by a single tube.

  Further, the configuration in which the tube winding part 62i in the inner heat transfer coil 60i is disposed inside the tube winding part 62o in the outer heat transfer coil 60o has been described as an example. "Tube winding part" can also be arranged side by side along the winding axis direction.

  Further, the brine introduction part 43 is disposed in the lower part of the container body 40 and the brine discharge part 44 is disposed in the upper part of the container body 40, whereby the brine flows in the container body 40 from below to above. The configuration has been described as an example, but instead of such a configuration, a configuration in which the “heating medium liquid (brine)” flows from the upper side to the lower side of the “container body” can be adopted (not shown). ) In the case of adopting such a configuration, the above-described heat for cooling the hydrogen gas is adopted by adopting a configuration in which the hydrogen gas flows in the “tube winding part” in the “heat transfer coil” from below to above. In the same manner as the exchanger 30, it is preferable to flow the hydrogen gas and the “heat medium liquid” in opposite directions. Furthermore, it is also possible to employ a configuration in which the “heat exchanger” is laid down so that the hydrogen gas or “heat medium liquid” moves in the horizontal direction (not shown).

  In addition, the configuration in which the brine that is an example of the “heating medium liquid” is cooled by the refrigeration circuit 11 that is an example of the “unified refrigeration circuit” has been described as an example, but the evaporation of the first refrigeration circuit (the high temperature side refrigeration circuit). The condenser of the second refrigeration circuit (low temperature side refrigeration circuit) is cooled by the condenser to condense a sufficient amount of the refrigerant in the condenser of the second refrigeration circuit in a short time, and the evaporator of the second refrigeration circuit " It is also possible to adopt a “two-way refrigeration circuit” that can lower the temperature of the “heat transfer fluid” to a sufficiently low temperature suitable for cooling hydrogen gas by cooling the “heat transfer fluid” (not shown) .

DESCRIPTION OF SYMBOLS 100 Hydrogen gas supply system 1 Hydrogen gas cooling device 11 Refrigeration circuit 12 Brine tank 13a-13d Brine piping 14a, 14b Liquid feed pump 15 Control part 30 Heat exchanger for hydrogen gas cooling 40 Container body 41 Cylindrical part 42b, 42t Cover Part 43 Brine introduction part 44 Brine discharge part 45 Speed increasing shaft 46 Through metal fitting 50 Hydrogen gas pipe 51a Hydrogen gas introduction part 51b Hydrogen gas discharge part 60i Inner heat transfer coil 60o Outer heat transfer coil 60c Connection part 61i, 61o Falling straight line 62i, 62o Tubular winding part 62ia, 62oa Upper winding part 62ib, 62ob Lower winding part 63i, 63o Rising straight part 65si, 65so Linear part 65ci, 65co Curved part 71 Base 72 Tightening part 73 Seal material F4 Connection bracket P1a, P1b, P2 i, P2o, P1i, P1o Welding location S Heat exchange space X Air supply target

Claims (3)

A heat transfer coil having a tube winding portion in which a tube capable of passing hydrogen gas is spirally wound, and a heat transfer coil that is formed in a cylindrical shape so that the heat transfer fluid can pass therethrough and accommodates the heat transfer coil A heat exchanger configured such that the hydrogen gas and the heat transfer fluid can exchange heat with each other in the container,
A plurality of the heat transfer coils are connected via a connecting portion formed of the tubular body to form a hydrogen gas flow path through which the hydrogen gas can pass, and from one end of the hydrogen gas flow path to the other A plurality of the pipes connected to each other by end face welding are integrally formed up to the end , and the connection parts by the end face welding in the pipes constituting the hydrogen gas flow path are linear. Heat exchanger being formed . It said heat transfer coil, heat exchanger according to claim 1, wherein the winding shape of the tubular body winding portion is formed in a polygonal shape. A heat exchanger according to claim 1 or 2 , and a refrigeration circuit for cooling the heat transfer fluid,
A hydrogen gas cooling device configured to be capable of cooling the hydrogen gas by mutually exchanging heat in the heat exchanger and the hydrogen gas cooled by the refrigeration circuit.

Images