JP2009074625A - Check valve unit and manual opening and closing valve apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve unit and a manual opening and closing valve apparatus capable of surely preventing a backflow of a high-pressure gas by a single check valve. <P>SOLUTION: This check valve unit 8 comprises a first housing 21, a second housing 22 fastened to the first housing by screwing, a check valve body 23 encapsulated in the first housing, and a resin sheet 27 arranged between the first housing and the second housing and forming a valve seat 29, from which the check valve body is separated. The resin sheet is crushed by fastening the first housing to the second housing, and a surface pressure to the end face on the valve seat side of the first housing is heightened, and an annular concave groove 41 is formed on the end face of the first housing. A seal ring 42 shrunk by the resin sheet is mounted to the annular concave groove. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a check valve device used in a gas tank that stores high-pressure gas such as hydrogen, and a manual on-off valve device using the check valve device.

  Generally, a plug body that closes an opening of a gas tank includes a plurality of valve devices such as a plurality of flow paths that connect the inside and the outside of the gas tank, and a manual on-off valve that blocks the flow of high-pressure gas in each flow path. Is provided. As this type of valve device, for example, one described in Patent Document 1 is known.

Incidentally, in recent years, hydrogen gas tanks mounted on fuel cell vehicles and the like have been further increased in pressure in order to increase the storage capacity, and higher reliability corresponding to the increased pressure is required. For this purpose, as described in Patent Document 1, for example, a check valve for preventing a backflow of stored hydrogen is provided in a filling path for filling hydrogen gas in a gas tank in addition to the above-described manual on-off valve. However, in order to ensure the reliability according to the high pressure, the check valve is multiplexed to provide redundancy.
JP 2006-144841 A

  However, in the thing of above-mentioned patent document 1, since the structure which multiplexed the check valve is employ | adopted, although reliability can be ensured, the number of parts of a valve apparatus increases, and it enlarges, There is a problem of high costs.

  Moreover, in the thing of patent document 1, the cover body (25,26) which formed the valve seat which the valve body of a non-return valve contacts / separates is formed with the elastic material, and by elastic deformation of a cover body The sealing performance can be ensured, but the load in the direction away from the end face of the housing (23, 24) is applied to the lid by a check valve on which the pressure of the stored gas acts. Therefore, if the stored gas becomes an ultra-high pressure, the sealing performance between the end face of the housing and the lid may be lowered, which restricts the pressure of the stored gas.

  The present invention has been made to solve the above-described conventional problems, and a check valve device capable of reliably preventing the backflow of high-pressure gas by a single check valve and manual opening / closing using the check valve device An object of the present invention is to provide a valve device.

  In order to solve the above problem, the check valve device according to claim 1 is characterized in that a plug body housing provided in a gas tank for storing high-pressure gas and a housing hole formed in the plug body housing. And a check valve device for preventing a back flow of the high-pressure gas stored in the gas tank, the check valve device including a first housing fitted into the receiving hole, and screwing into the first housing. A second housing fastened and fitted in the receiving hole; a check valve body enclosed in the first housing; and the check valve disposed between the first housing and the second housing. A resin seat that forms a valve seat that contacts and separates the body, the resin sheet being crushed by fastening the first housing to the second housing, and the valve seat side of the first housing High contact pressure with the end face And adapted to be an annular groove is formed on the end face of the first housing, is that the sealing ring is 押縮 by the resin sheet in the annular groove is mounted.

  A check valve device according to a second aspect of the present invention is characterized in that, in the first aspect, the resin sheet is crushed by fastening the first housing to the second housing, whereby the annular recess is formed by elastic deformation. It is to fit in the groove.

  The manual open / close valve device according to claim 3 is characterized in that the manual open / close valve device is arranged in series with the check valve device according to claim 1 or 2, wherein the manual open / close valve device is connected to the stopper. A plug that is screwed into the receiving hole of the body housing, and fixes the first housing and the second housing in the receiving hole, and is slidably fitted in the plug; 2. An open / close valve body that opens and closes the open / close flow path formed in the housing is provided, and the open / close flow path is opened by the open / close valve body to fill the gas tank with the high-pressure gas through the check valve body. That is.

  According to the check valve device of the present invention, the resin sheet on which the valve seat to which the check valve body contacts and separates is squeezed by fastening the first housing to the second housing, The surface pressure with the end face on the valve seat side of the housing is increased and a seal ring that is pressed and compressed by a resin sheet is attached to the annular groove formed in the end face of the first housing, so that the gas tank is filled. When the high pressure gas acts on the check valve body, even if the surface pressure between the one end of the housing and the resin sheet is reduced, leakage of hydrogen gas can be reliably prevented by the O-ring. In addition, since the resin sheet is in close contact with the end face of the housing and the O-ring does not protrude, it is possible to eliminate the need for a backup ring, thereby reducing the number of parts and improving cost and assembly. be able to.

  According to the invention of the check valve device according to claim 2, the resin sheet is squeezed by fastening the first housing to the second housing, so that the resin sheet is fitted into the annular groove by elastic deformation. Therefore, it is possible to prevent the O-ring from protruding more reliably.

  According to the invention of the manual open / close valve device according to claim 3, the manual open / close valve device is arranged in series with the check valve device according to claim 1 or claim 2, A plug that is screwed into the receiving hole and fixes the first housing and the second housing in the receiving hole, and an open / close flow path that is slidably fitted to the plug and formed in the second housing of the check valve device. Since the opening and closing valve body is provided, the first housing and the second housing of the check valve device can be fixed to the receiving hole by a plug, and the check valve device and the manual opening and closing valve device are connected in series in the receiving hole. Can be easily incorporated into.

  Embodiments in which the present invention is applied to a hydrogen gas tank will be described below with reference to the drawings. As shown in FIG. 1, the gas tank 1 of the present embodiment includes a tank main body 2 that stores hydrogen gas and a plug body 3 that closes an opening 2 a thereof. 2 are provided with a plurality of flow passages communicating between the inside and the outside thereof, and a plurality of valve devices for controlling the flow of hydrogen gas in each of the flow passages.

  Specifically, a filling path 5 for filling the gas tank 1 with hydrogen gas, a supply path 6 for supplying the hydrogen gas in the gas tank 1 to the outside, and the hydrogen gas in the gas tank 1 are supplied to the plug body 3. An open path 7 for discharging to the outside is formed.

  A check valve device 8 that prevents the backflow of hydrogen gas stored in the gas tank 1 and a manual on-off valve device 9 that can be manually operated from the outside to block the hydrogen gas flow are disposed in the filling path 5. A pressure reducing valve device 10, a manual on-off valve device 11, and an electromagnetic on-off valve device 12 are arranged in the supply path 6, and a manual on-off valve apparatus 13 is arranged in the open path 7.

  Hereinafter, an embodiment of the check valve device 8 and the manual on-off valve device 9 arranged in the filling path 5 will be specifically described based on FIGS. 2 and 3.

  In FIG. 2, a housing hole 16 that opens to the outside is formed in the plug body housing 16 that forms the plug body 3, and the first flow path 18 and the second flow path that form the filling path 5 are formed in the storage hole 17. 19 is connected. The housing hole 17 is composed of a small-diameter hole 17a, an intermediate-diameter hole 17b, and a large-diameter hole 17c formed in order from the back of the housing hole 17, and a threaded portion (female thread) is formed in the large-diameter hole 17c. ing.

  The check valve device 8 is disposed from the small diameter hole 17a to the intermediate diameter hole 17b, and the manual opening / closing valve device 9 is disposed from the intermediate diameter hole 17b to the large diameter hole 17c. A first flow path 18 communicating with the inside of the gas tank 1 (tank body 2) is opened in the small diameter hole 17a, and a second flow path 19 communicating with the outside of the tank is opened in the intermediate diameter hole 17b.

  The check valve device 8 is integrally fastened by screwing to the first housing 21 accommodated in the intermediate diameter hole 17b of the accommodation hole 17 and one end of the first housing 21, and is fitted into the intermediate diameter hole 17b. The second housing 22 and the check valve body 23 accommodated in the first housing 21 are mainly configured. The first housing 21 has a small-diameter cylindrical portion 21a that fits into the small-diameter hole 17a, and a gap between the outer periphery of the small-diameter cylindrical portion 21a and the small-diameter hole 17a is sealed by a sealing means 25 that includes an O-ring and a backup ring. Has been.

  As shown in FIG. 3, the first housing 21 is provided with a valve hole 26 for accommodating the check valve body 23, and one end of the valve hole 26 is formed at the center of the small-diameter cylindrical portion 21 a. It is connected to the first flow path 18 via a path 39. A resin sheet 27 is disposed at the other end of the valve hole 26 so as to be sandwiched between the first housing 21 and the second housing 22. The resin sheet 27 is made of, for example, polyimide resin, and a through hole 28 is formed at the center of the resin sheet 27. A valve seat 29 is formed at one end of the through hole 28 on the valve hole 26 side. In the valve hole 26, a check valve body 23 having a tapered poppet that can come into contact with and separate from the valve seat 29 is slidably fitted. The check valve body 23 abuts the valve seat 29 by a spring 30. Is biased in the direction.

  A high-pressure hydrogen gas is applied to the check valve body 23 in the same direction as the urging direction of the spring 30 via the first flow path 18 and the flow path 39. The valve seat 29 is closed. A radial passage and an axial passage are formed in the check valve body 23. When the check valve body 23 is separated from the valve seat 29, the through-hole 28 forming the valve seat 29 has a check valve. It communicates with the first flow path 18 through a radial passage and an axial passage formed in the body 23 and a flow passage 39 formed in the small-diameter cylindrical portion 17a.

  The second housing 22 has a cylindrical shape and has a partition wall 22a at the center in the axial direction. A screw hole 22b for screwing and fastening a screw portion 21b formed on one end outer periphery of the first housing 21 is formed on one end side of the partition wall 22a, and a manual opening / closing valve device 9 described later is opened and closed on the other end. A cylindrical recessed portion 33 that is loosely fitted to the distal end portion of the valve body 53 is formed. The recessed portion 33 communicates with the valve seat 29 via an open / close channel 34 formed in the partition wall 22a.

  A filter 35 that opens to the second flow path 19 is mounted on the outer peripheral side of the recessed portion 33 formed in the second housing 22, and the filter 35 is recessed through a radial hole 36 formed in the second housing 22. The unit 33 communicates with the unit 33. Accordingly, hydrogen gas can be supplied from the second flow path 19 into the gas tank 1 through the filter 35, the recessed portion 33, the open / close flow path 34, the check valve body 23, and the like.

  A hexagonal head 37 is formed on the outer periphery of the first housing 21, and a two-sided width portion 38 is formed on the outer periphery of the second housing 22. By rotating the hexagonal head 37 of the first housing 21 in a state where the housing 22 is prevented from rotating, the screw portion 21b of the first housing 21 is screwed into the screw hole 22b of the second housing 22, and the first and second The housings 21 and 22 can be fastened together. As a result, the check valve device 8 can be assembled in the housing hole 17 of the plug body housing 16 in an assembled state in advance.

  The above-described check valve device 8 is configured to prevent leakage of high-pressure hydrogen gas by one check valve body 23. For this purpose, the resin sheet 27 on which the valve seat 29 with which the check valve body 23 comes into contact with and separated from is separated from the end face of the first housing 21 and the partition wall of the second housing 22 by fastening the first and second housings 21 and 22. The contact pressure between the one end of the resin sheet 27 and the end face of the first housing 21 is increased.

  That is, before the first and second housings 21 and 22 are fastened, the resin sheet 27 has a substantially disk shape as shown in FIG. By fastening 22, the peripheral edge portion of the resin sheet 27 is crushed between the end surface of the first housing 21 and the partition wall 22 a of the second housing 22 as shown in FIG. 4. As a result, the peripheral edge of the resin sheet 27 is elastically deformed by applying stress, and the surface pressure between one end of the resin sheet 27 and the end surface of the first housing 21 is increased. Conversely, the central portion of the resin sheet 27 that is not crushed between the end face of the first housing 21 and the partition wall 22 a of the second housing 22 enters the valve hole 26 and fits in the valve hole 26. Will fit.

  An annular groove 41 is formed on the end surface of the first housing 21 where the surface pressure with the resin sheet 27 is increased, and an O-ring 42 as a seal ring is attached to the annular groove 41. Before the first and second housings 21 and 22 are fastened, the O-ring 42 slightly protrudes from the end surface of the first housing 21 as shown by a two-dot chain line in FIGS. 3 and 4. As described above, the peripheral edge of the resin sheet 27 is crushed by the fastening of the first and second housings 22, so that the resin sheet 27 is compressed by one end of the resin sheet 27. At this time, due to the mutual relationship between the elastic force of the resin sheet 27 and the elastic force of the O-ring 42, one end of the resin sheet 27 is deformed while pressing and compressing the O-ring 42 and is fitted into the annular groove 41. A protrusion 27a is formed. As a result, as shown in FIG. 4, a step d <b> 1 is formed at one end of the resin sheet 27 due to the difference in creep amount (the amount crushed by the load).

  According to the check valve device 8 configured as described above, when the pressure of the high-pressure hydrogen gas filled in the gas tank 1 acts on the check valve body 23, the check valve body 23 is applied to the valve seat 29 of the resin sheet 27. A load acts in the direction of pressing. For this reason, the check valve body 23 is brought into close contact with the valve seat 29 of the resin sheet 27 with a large load, and the sealing performance at that portion is improved. At the same time, the resin sheet 27 has a direction to relieve stress of the resin sheet 27 generated by the fastening of the first and second housings 21, 22, in other words, one end of the resin sheet 27 and the end surface of the first housing 21. The load acts in the direction in which the surface pressure decreases.

  As a result, the sealing performance between one end of the resin sheet 27 and the end surface of the first housing 21 is deteriorated, but in this embodiment, between the one end of the resin sheet 27 and the end surface of the first housing 21. Since the O-ring 42 is disposed, the O-ring 42 reliably prevents hydrogen gas from leaking even if the surface pressure between one end of the resin sheet 27 and the end surface of the first housing 21 decreases.

  Moreover, even if the surface pressure between one end of the resin sheet 27 and the end surface of the first housing 21 is reduced, one end of the resin sheet 27 is still in close contact with the end surface of the first housing 21 without a gap. For this reason, even if a high pressure is applied to the O-ring 42, the O-ring 42 does not protrude between one end of the resin sheet 27 and the end surface of the first housing 21, and a backup ring can be made unnecessary. . As a result, the reliability with respect to the protrusion of the O-ring 42 can be improved without using a backup ring, the number of parts can be reduced, and the cost can be reduced and the assembly can be improved. .

  At this time, if a protrusion 27 a that fits into the annular groove 41 is formed at one end of the resin sheet 27, the O-ring 42 protrudes even when a large load acts on the check valve body 23. Can be prevented more effectively.

  As shown in FIG. 2, the manual on-off valve device 9 includes a first plug 51 and a second plug 52 that are screwed into threaded portions formed in the large-diameter hole 17 c of the accommodation hole 17, and a slide on the first plug 51. The on-off valve body 53 is movably fitted to the second plug 52, and the operation screw shaft 54 is operated to move the on-off valve body 53 forward and backward.

  The first plug 51 includes a fitting portion 51 a that fits into the intermediate diameter hole 17 b, and one end (tip) of the fitting portion 51 a abuts on the end portion of the second housing 22, and the first plug 51 By tightening, the first housing 21 fastened to the second housing 22 is brought into contact with and fixed to the bottom surface of the intermediate diameter hole 17 b of the accommodation hole 17. The outer periphery of the fitting portion 51a of the first plug 51 and the intermediate diameter hole 17b are sealed by a sealing means 55 including an O-ring and a backup ring. An opening / closing valve element 53 is slidably fitted in the center of the fitting part 51 a of the first plug 51, and an O between the inner periphery of the fitting part 51 a and the outer periphery of the opening / closing valve element 53 is O. It is sealed by sealing means 56 comprising a ring and a backup ring.

  The distal end of the on-off valve body 53 is inserted into the recessed portion 33 of the second housing 22 with a gap. Further, a recess 61 is formed at the center of the front end surface of the on-off valve body 53, and an annular protrusion 53a is formed around the recess 61. A ring-shaped resin sheet 62 that opens and closes the open / close channel 34 formed in the partition wall 22 a of the second housing 22 of the check valve device 8 is press-fitted into the recess 61 of the open / close valve body 53. The resin sheet 62 is made of, for example, polyimide resin, and is configured to open and close the open / close channel 34 in a planar contact with the partition wall 22a. The thickness of the resin sheet 62 is larger than the depth of the recess 61 in the free state, and protrudes beyond the tip of the annular protrusion 53a of the on-off valve body 53 in the state where the on-off passage 34 is open. ing.

  The second plug 52 is screwed into the threaded portion of the large diameter hole 17c at the outer position of the first plug 51. An operation screw shaft 54 formed with a hexagonal hole 63 is screwed into the second plug 52 so that the position can be adjusted, and can be locked at an arbitrary position by a lock nut 64.

  A spring 65 is provided between the first plug 51 and the opening / closing valve body 53, and the biasing force of the spring 65 causes the normal opening / closing valve body 53 to be retracted to a position where it abuts on the operation screw shaft 54, thereby 34 is open. By turning the hexagonal hole 63 to advance the operation screw shaft 54, the on-off valve body 53 can be moved against the urging force of the spring 65, and the resin sheet 62 provided at the tip of the on-off valve body 53. Is brought into surface contact with the partition wall 22a of the second housing 22 and crushed to close the open / close channel 34. At this time, when the resin sheet 62 is compressed by a predetermined amount, the annular protrusion 53a of the on-off valve body 53 comes into contact with the end face of the partition wall 22a, so that excessive crushing of the resin sheet 62 can be prevented. A restricting plate 67 for restricting the retracted position of the operation screw shaft 54 is provided on the operation screw shaft 54.

  According to the check valve device 8 in the above-described embodiment, when the check valve device 8 is configured by fastening the first and second housings 21 and 22, the peripheral portion of the resin sheet 27 is the first And it crushes between each end surface of the 2nd housings 21 and 22, and the surface pressure of the end of the resin sheet 27 and the end surface of the 1st housing 21 is raised. In addition, an annular groove 41 is formed in the end surface of the first housing 21 with which the resin sheet 27 abuts, and an O-ring 42 is attached thereto.

  As a result, the pressure of the high-pressure hydrogen gas filled in the gas tank 1 acts on the check valve body 23, so that the stress of the resin sheet 27 generated by the fastening of the first and second housings 21 and 22 is relieved. Even if the surface pressure between one end of the resin sheet 27 and the end surface of the first housing 21 decreases, the O-ring 42 can reliably prevent hydrogen gas from leaking.

  In addition, even if the surface pressure between one end of the resin sheet 27 and the end surface of the first housing 21 is reduced, one end of the resin sheet 27 is in close contact with the end surface of the first housing 21, so that the O-ring 42 protrudes. This eliminates the need for a backup ring. As a result, the reliability with respect to the protrusion of the O-ring 42 can be improved without using a backup ring, and the number of parts can be reduced.

  On the other hand, according to the manual on-off valve device 9 in the above-described embodiment, the on-off valve body 53 is moved toward the check valve body 23 against the biasing force of the spring 65 by rotating the operation screw shaft 54. By doing so, the resin sheet 62 attached to the tip of the on-off valve body 53 is pressed and compressed against the end face of the partition wall 22a of the second housing 22, and is brought into plane contact with the end face of the partition wall 22a. As a result, the open / close channel 34 formed in the partition wall 22a is closed, and the flow of hydrogen gas in the filling channel 5 is blocked. At this time, when the resin sheet 62 is compressed by a predetermined amount, the annular protrusion 53a of the on-off valve body 53 comes into contact with the end face of the partition wall 22a, so that excessive crushing of the resin sheet 62 can be prevented.

  By rotating the operating screw shaft 54 in the direction opposite to the above, the on-off valve body 53 can be moved away from the check valve body 23 by the biasing force of the spring 65 and is attached to the tip of the on-off valve body 53. The resin sheet 62 is separated from the partition wall 22a of the second housing 22, and the open / close channel 34 is opened.

  In this state, when hydrogen gas is introduced from the second flow path 19, the hydrogen gas flows into the recessed portion 33 through the filter 35, acts on the check valve body 23 via the open / close flow path 34, The valve stop 23 is pushed against the urging force of the spring 30. As a result, the valve seat 29 is opened, and hydrogen gas flows into the first flow path 18 and fills the tank body 2.

  In the above-described embodiment, the resin sheet 27 disposed between the first and second housings 21 and 22 is fitted into the annular groove 41 by elastic deformation. As an alternative, a projection having a projection that fits in the annular groove 41 in advance may be used.

  In the above-described embodiment, the manual opening / closing valve device 9 is configured to open / close the opening / closing channel 34 by planar contact. However, like the check valve device 8, the opening / closing channel is opened / closed by taper contact. You may do it.

  As described above, the present invention is not limited to the above-described embodiments, and various forms can be adopted without departing from the gist of the present invention described in the claims.

It is a circuit diagram of the gas tank which shows embodiment of this invention. It is sectional drawing of the non-return valve apparatus and manual on-off valve apparatus which show embodiment of this invention. It is the expanded sectional view which expanded the principal part of FIG. It is the expanded sectional view which expanded a part of Drawing 3 further. It is a figure which shows the state before the fastening of a 1st and 2nd housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Gas tank, 2 ... Tank main body, 3 ... Plug body, 5 ... Filling path, 8 ... Check valve device, 9 ... Manual on-off valve device, 16 ... Plug body housing, 17 ... Housing hole, 21 ... 1st housing, DESCRIPTION OF SYMBOLS 22 ... 2nd housing, 23 ... Check valve body, 26 ... Valve hole, 27 ... Resin sheet | seat, 29 ... Valve seat, 33 ... Recessed part, 34 ... Open / close flow path, 41 ... Annular groove, 42 ... Seal ring (O-ring), 51, 52 ... plug, 53 ... open / close valve body, 54 ... operating screw shaft, 61 ... recess, 62 ... resin sheet.

Claims (3)

A stopper housing provided in a gas tank that stores high-pressure gas, and a check valve device that is accommodated in an accommodation hole formed in the stopper housing and prevents backflow of the high-pressure gas stored in the gas tank,
The check valve device is enclosed in the first housing, the first housing fitted into the accommodation hole, the second housing fastened by screwing into the first housing and fitted into the accommodation hole, and the first housing. A non-return valve body, and a resin seat disposed between the first housing and the second housing and forming a valve seat to which the check valve body comes in contact with and separates from,
The resin sheet is crushed by fastening the first housing to the second housing, so that the surface pressure with the end face on the valve seat side of the first housing is increased,
A check valve device, wherein an annular groove is formed in an end surface of the first housing, and a seal ring that is pressed and compressed by the resin sheet is attached to the annular groove.   2. The resin sheet according to claim 1, wherein the resin sheet is elastically deformed by being crushed by fastening the first housing to the second housing and is fitted into the annular groove. Check valve device. A manual open / close valve device is arranged in series on the check valve device according to claim 1, wherein the manual open / close valve device is screwed into the accommodation hole of the plug body housing, and the first housing And a plug for fixing the second housing in the receiving hole, and an on-off valve body that is slidably fitted to the plug and opens and closes an on-off passage formed in the second housing of the check valve device The open / close flow path is opened by the open / close valve body, and the high pressure gas is filled into the gas tank through the check valve body.

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