JP2016155061A - High pressure filter device and hydrogen station using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-pressure filter device of high flow rate which can maintain a filtration function for impurities contained in high-pressure flowing water by preventing a slack of integration even when the flowing water flows to secure a high sealability, and a hydrogen station using the same.SOLUTION: A body 10 having a pipe junction 20 is coupled with a cap 11 having a pipe junction 30 by screwing via a counter seal part 16, where the counter seal part 16 forms obtuse-angled edge seal parts 26, 36 on seal faces 25, 35 of the body 10 with the cap 11, respectively, in an inner peripheral direction. A gasket 12 is clamped with both the edge seal parts 26, 36 to configure them, and a filter element 13 having a bottomed part 40 on the primary side, and an opening part 41 on the secondary side is stored in a cylindrical space part 22 provided in a channel 23 of the body 10. The filter element 13 keeps the bottomed part 40 pressed by a spring 14, and the opening part 41 hermetically sealed by a seal mechanism 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high-pressure filter device, and more particularly to a high-pressure filter device for removing impurities contained in hydrogen in a flow path such as a hydrogen station through which a high-pressure fluid such as hydrogen flows, and a hydrogen station using the high-pressure filter device.

  In recent years, the infrastructure for supplying hydrogen stations for automobile fuel cells has become widespread. When supplying hydrogen for a fuel cell at a hydrogen station, impurities in the hydrogen may adversely affect the power generation performance of the fuel cell, so it is desirable that the impurities in the hydrogen be as small as possible. Therefore, it has been required to install a filter device for removing impurities in the piping flow path of the hydrogen station. In this case, for example, high-pressure hydrogen of about 99 MPa may flow in the hydrogen station. The filter device must be able to withstand this high pressure fluid.

  As filter devices for removing impurities from hydrogen gas, for example, the filter devices of Patent Document 1 and Patent Document 2 are disclosed. These filter devices are provided in a flow path for supplying hydrogen to a storage tank, and a filter member for removing impurities contained in hydrogen is provided therein. When a filter member is installed in these filter devices, for example, as shown in FIG. 3 of Patent Document 1, a filter member is filled in a casing that is open on one side, and a cap member is screwed into the casing via a gasket. Integrated.

  Furthermore, for example, a high pressure hydrogen filter device 1 shown in FIG. 5 is known as a filter device provided in a flow path for supplying high pressure hydrogen to a tank of a fuel vehicle. In the filter device 1, a bottomed cylindrical filter 2 for filtration is elastically mounted in a body member 4 and a cap member 5 via a coil spring 3. The body member 4 and the cap member 5 are assembled by screwing via a sealing O-ring member 6, and this O-ring member 6 is in contact with the flow passage inner peripheral surface 7 of the body member 4 on the outer periphery of the cap member 5. Mounted in position.

  In addition, as a high pressure hydrogen filter device other than these, a gently tapered surface with the inner diameter side at the top is formed at the tip of the cap member, and a flat portion is formed on the inner periphery on the body member side, and the cap member and the filter are accommodated. It is known that the taper surface and the flat portion are pressed against each other with a strong tightening torque at the time of screw connection with the body member to prevent leakage to the outside.

JP 2002-54798 A Japanese Patent No. 5026931

  The filter devices of Patent Document 1 and Patent Document 2 are provided in a flow path for supplying hydrogen to a storage tank, and this flow path is set for a relatively low pressure of about 1 MPa, for example. Therefore, these filter devices are not suitable for a high-pressure hydrogen flow path of about 99 MPa.

  On the other hand, in the filter device 1 of FIG. 5, since the body member 4 and the body member 4 are sealed on the edge side of the cap member 5 via the O-ring member 6 attached to the front outer peripheral side of the cap member 5, When the member 5 starts to loosen, the sealing performance by the O-ring member 6 is immediately lost, and fluid leakage tends to occur. In addition, since the tightening torque of the O-ring member 6 is generated by screwing the body member 4 and the cap member 5, the tightening torque is reduced and the pressure of the high-pressure fluid, the elastic force of the coil spring 3, the external force, etc. Therefore, the cap member 5 is easy to loosen.

  When the cap member 5 is loosened, the elastic force of the coil spring 3 is weakened, and there is a problem that a gap is formed between the cylindrical filter 2 and the body member 4 side and the filtering function of the filter device 1 is insufficient. Further, in this filter device 1, the holding member 8 provided between the body member 4 and the body member 4 is formed in a cylindrical shape via the packing member 8 a by repelling the vicinity of the center of the bottomed surface 3 a of the cylindrical filter 2 with the coil spring 3. Pressing the filter 2 as a whole, the sealing O-ring 9 provided on the back side of the holding member 8 prevents leakage from the back side of the holding member 8, and the packing member 8a seals between the cylindrical filter 2 and the holding member 8 It is something to try. Therefore, the transmission efficiency of the elastic force by the coil spring 3 is deteriorated, the sealing performance by the packing member 8a cannot be maintained due to the looseness of the cap member 5, and leakage from between the cylindrical filter 2 and the holding member 8 is likely to occur. .

By inserting the front side of the cap member 5 into the flow path 4a of the body member 4 and connecting them together, the inner diameter φdA of the cap spring 5 mounting portion of the cap member 5 is equal to the inner diameter (flow path diameter) φdB of the body member 4. It becomes extremely smaller than Therefore, there is a problem that the flow rate on the cap member 5 side is reduced and the pressure loss is increased. In order to avoid this, if an attempt is made to increase the inner diameter φdA of the cap member 5, the thickness on the insertion side is insufficient, and it becomes difficult to ensure sufficient strength against the high-pressure fluid.
Furthermore, since the O-ring member 6 is located on the flow path inner peripheral surface 7 within the flow path diameter, there is a possibility that particles are generated when the high-pressure fluid flows and adversely affect it.

  Further, in the case of a structure in which the taper surface of the cap member and the flat portion of the body member are tightened to prevent external leakage, a large tightening torque is required for directly pressing and sealing the metal body member and the cap member. In addition, since the flat surface portion is deformed after the press contact, there is a possibility that a gap is generated in the press contact seal portion when maintaining the sealing performance of the high pressure fluid when it is tightened again after disassembly by maintenance or the like.

  The present invention has been developed to solve the above-described problems, and the object of the present invention is to prevent the looseness of the built-in even when a high-pressure fluid flows, to ensure high sealing performance, and to be included in the fluid. An object of the present invention is to provide a high-pressure filter device having a large flow rate capable of maintaining the function of removing impurities and a hydrogen station using the same.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a body having a pipe joint portion and a cap having a pipe joint portion are screwed together via an opposing seal portion, and the opposing seal portion is formed by the body and the cap. An obtuse edge seal portion is formed in the inner circumferential direction of the seal surface, and a gasket is sandwiched between the two edge seal portions, and is provided on the primary side in a cylindrical space provided in the body flow path. A filter element having a bottom and having an opening on the secondary side is housed. This filter element is a high-pressure filter device in which a bottomed portion is pressed by a spring and the opening is hermetically sealed by a seal mechanism.

  The invention according to claim 2 is a high pressure filter device in which one end of the spring is engaged with a stepped portion having a diameter larger than the flow path diameter of the cap, and the other end is elastically contacted with the outer peripheral side position of the bottomed portion of the filter element. is there.

  According to a third aspect of the present invention, the sealing mechanism is a mechanism that is held by a holder having a packing provided in the opening of the filter element and a flow path hole that sandwiches the packing, and is hermetically sealed by the spring force of the spring. It is a filter device.

  The invention according to claim 4 is the high pressure filter device in which the filter element is a sintered body made of stainless steel or stainless steel alloy.

  The invention according to claim 5 is the high-pressure filter device in which the obtuse edge seal portion has a mountain shape with a cross section of 160 to 178 degrees, and a gasket is sandwiched between the mountain shapes.

  The invention according to claim 6 is a hydrogen station using a high-pressure filter in a high-pressure hydrogen supply line.

  According to the first aspect of the present invention, the tightening torque is increased and the high-pressure fluid flows by screwing the body and the cap through the opposing seal portion while sandwiching the gasket with the obtuse angle edge seal portion. Even in this case, loosening of the body and the cap can be prevented, and a high pressure-sealing property and durability can be secured by maintaining the pressure-tight state of the gasket. In particular, by providing an obtuse edge seal portion on the seal surface of the opposed seal portion, a higher surface pressure can be obtained on the inner peripheral side of the seal surface even when the torque is smaller than when the seal surface is flat. It is possible to ensure high sealing performance. Even if looseness occurs between the body and the cap, the sealing performance is not immediately lost, and the sealing performance can be recovered by tightening them. By such a function of preventing the cap from loosening, it is possible to prevent a decrease in the elastic force of the spring and to maintain the hermetically sealed state between the filter element and the seal mechanism and to reliably maintain the impurity removal function. By providing the opposing seal part outside the flow path, the generation of particles due to the contact of the fluid with the gasket is suppressed to maintain the purity of the fluid, while the flow path is increased in diameter to suppress pressure loss and a large flow rate. The impurities in the fluid can be removed.

  According to the second aspect of the invention, by engaging one end of the spring with the stepped portion having a diameter larger than the flow path diameter of the cap, a large flow path can be secured while suppressing the influence of the high pressure fluid on the spring. Impurities in high-pressure fluid at a flow rate can be removed. By making the other end of the spring elastically contact with the outer peripheral side position of the bottomed portion of the filter element, it is transmitted to the seal mechanism while enhancing the transmission efficiency of the elastic force of the spring, and the sealing and sealing performance by the seal mechanism is enhanced.

  According to the invention which concerns on Claim 3, while sealing a filter element with a holder in the stable state, the sealing performance of the filter element opening side is ensured with packing, and a hermetically sealed state can be maintained.

  According to the invention of claim 4, it is possible to reliably remove impurities contained in hydrogen by increasing filtration accuracy, and to easily form a high-accuracy filter element, so that an existing filter element is used according to the flow path diameter. Can be exchanged easily.

  According to the invention of claim 5, by sandwiching the gasket with an obtuse edge seal portion, it is difficult to loosen the body and the cap while preventing external leakage from between them, and effectively exerting the sealing function. Prevent high pressure fluid leakage.

  According to the sixth aspect of the present invention, it is possible to provide a hydrogen station that removes impurities in the high-pressure fluid and supplies it to the secondary side while ensuring the pressure of the high-pressure fluid by preventing external leakage.

It is a longitudinal section showing an embodiment of a high pressure filter device in the present invention. FIG. 2 is an exploded perspective view of the high pressure filter device of FIG. 1. FIG. 2 is a partially omitted enlarged longitudinal sectional view of FIG. 1. It is the block diagram which showed the hydrogen station. It is a longitudinal cross-sectional view which shows an example of the conventional high pressure filter apparatus.

Hereinafter, embodiments of a high-pressure filter according to the present invention will be described in detail with reference to the drawings. 1 and 2 show an embodiment of the high-pressure filter device of the present invention, and FIG. 3 shows a partially enlarged sectional view of FIG.
As shown in FIGS. 1 and 2, the high-pressure filter device according to the present invention includes a body 10, a cap 11, a gasket 12, a filter element 13, a spring 14 including a coil spring, and a seal mechanism 15. 11 is screwed and connected via an opposing seal portion 16.

  The body 10 is made of a metal material, and is formed in a substantially cylindrical shape by, for example, a stainless alloy (SUS316). A tube joint portion 20 made of a female screw is formed on one end side of the body 10, and on the right side in the drawing, and a male screw of an external joint (not shown) is provided in the tube joint portion 20 so as to be screwed. A diameter-reduced hole 21 is formed following the pipe joint portion 20, and a cylindrical space portion 22 having an enlarged diameter is provided in the in-body flow path 23 in communication with the diameter-reduced hole 21. Further, an internal thread portion 24 is formed following the cylindrical space portion 22.

  As shown in FIG. 3, a seal surface 25 is formed on the opening side of the cylindrical space portion 22 of the body 10, and an obtuse edge seal portion 26 is formed in the inner peripheral direction of the seal surface 25. An angle α1 of the cross section of the edge seal portion 26 is a mountain shape of 160 to 178 degrees, and is provided at an obtuse angle of 170 degrees in this embodiment. Note that an inspection hole 27 for an airtight inspection is provided between the pipe joint portion 20 and the reduced diameter hole 21.

  In FIG. 1, a cap 11 is made of a metal material similarly to the body 10, and is made of, for example, a stainless alloy (SUS316) made of the same material as the body 10. Inside the cap 11, a flow path 28 that communicates with the flow path 23 of the body 10 is provided, and a tube joint portion 30 including a female screw portion is formed following the flow path 28. Similar to the female screw 20 of the body 10, a male screw portion of an external joint (not shown) is provided in the pipe joint portion 30 so as to be screwable.

As shown in FIG. 3, a seal surface 35 is provided on the side of the cap 11 facing the seal surface 25 of the body 10, and an obtuse angle edge seal portion 36 is formed in the inner circumferential direction of the seal surface 35 in the same manner as the body 10 side. Is formed. The angle α2 of the cross section of the edge seal portion 36 is, for example, a mountain shape of 160 to 178 degrees similarly to the body 10 side, and is provided at an obtuse angle of 170 degrees that is the same as the angle α1 in the present embodiment. A male screw portion 34 that can be screwed into the female screw portion 24 is formed on the body 10 mounting side of the cap 11, and the cap 11 is screwed into the body 10 via the male screw portion 34. An inspection hole 37 for an airtight inspection is provided between the pipe joint 30 and the flow path 28.
On the channel opening side of the cap 11, a step portion 38 having a diameter larger than the channel diameter and capable of engaging with the spring 14 is formed with an inner diameter φD 1.

  The sealing surfaces 25 and 35 of the body 10 and the cap 11 and the edge seal portions 26 and 36 formed on the sealing surfaces 25 and 35 are formed on the opposing seal portion 16, respectively. The gasket 12 is configured to be sandwiched between the edge seal portions 26 and 36.

  In FIG. 1, the gasket 12 is formed in a flat perforated disk shape, and can be clamped between the cross-sections of the edge seal portions 26 and 36 when the female screw portion 24 and the male screw portion 34 are screwed together. The gasket 10 seals between the body 10 and the cap 11. The gasket 12 is formed of a material having a hardness lower than that of the body 10 and the cap 11. Specifically, if the body 10 and the cap 11 are SUS316, the gasket 12 is preferably formed of copper or a copper alloy. .

  The filter element 13 is provided by a sintered body made of stainless steel or stainless steel alloy, and when removing high-pressure hydrogen impurities, it is desirable to use a sintered body with a nominal filtration accuracy of 5 to 20 μm. The filter element 13 is formed in a bottomed cylindrical shape having a bottomed portion 40 on the primary side and an opening 41 on the secondary side, and is housed in a cylindrical space portion 22 provided in the flow path 23 of the body 10. The

  In this case, one end of the spring 14 is engaged with the step portion 38 of the cap 11, and the other end is elastically contacted with the outer peripheral side position of the bottomed portion 40 of the filter element 13. As a result, the bottomed portion 40 is pressed by the spring 14 and the opening 41 is hermetically sealed by the seal mechanism 15.

  The seal mechanism 15 includes a packing 42 and a holder 43 and is provided on the secondary side of the body side flow path 23. The packing 42 is formed in a perforated disk shape with a resin such as PTFE (polytetrafluoroethylene), and is provided on the opening 41 side of the filter element 13.

  The holder 43 is attached to the back side of the packing 42 so as to hold and hold the packing 42 and is provided in a substantially cylindrical shape with a metal such as stainless steel, for example. A flow path hole 44 is formed at the center position of the holder 43, and the filtered fluid passing through the filter element 13 through the flow path hole 44 is sent to the secondary side. A seal member 45 made of an O-ring is mounted on the back side of the holder 43, and the back leakage of the holder 43 is prevented by this seal member 45.

A protrusion 46 is formed in the center of the back side of the holder 43, and the holder 43 is positioned at the center of the flow path 23 by fitting the holder 43 to the body 10 while fitting the protrusion 46 in the reduced diameter hole 21. Fixed in state. On the filter element 13 side of the holder 43, a convex portion 47 for mounting the packing 42 is formed.
With such a configuration, the sealing mechanism 15 is a mechanism that seals and seals the opening 42 of the filter element 13 by pressing the packing 42 by the elastic force of the spring 14.

  When the above-described high-pressure filter device is assembled, the holder 43 in which the packing 42 and the seal member 45 are mounted in the body 10 is mounted so that the protruding portion 46 is fitted in the reduced diameter hole 21, and then the packing 42 side. The filter element 13 is accommodated in the cylindrical space 22 with the opening 41 directed. In this state, the male screw portion 24 and the female screw are respectively inserted between the seal surface 25 and the seal surface 35 while the spring 14 is interposed between the outer peripheral side position of the bottomed portion 40 of the gasket 12 and the filter element 13 and the step portion 38. The body 10 and the cap 11 are integrated by screwing and tightening the portion 34. As a result, the gasket 12 is sandwiched between the edge seal portions 26 and 36, and the filter element 13 is positioned and held in the cylindrical space portion 22 in a state where the opening portion 41 is hermetically sealed by the seal mechanism 15 by pressing of the spring 14. Can be integrated in the state.

Next, the operation of the high-pressure filter device of the present invention in the above embodiment will be described.
In the high-pressure filter device of the present invention shown in FIG. 1, when the body 10 and the cap 11 are screwed together, the gasket 12 is clamped by the obtuse edge seal portions 26 and 36 of the opposed seal portion 16. Thus, the gasket 12 is tightly sealed with the seal surfaces 25 and 35 by a high seal surface pressure while being deformed along the edge seal portions 26 and 36.

  In this way, the body 10 on the female screw portion 24 side and the cap 11 on the male screw portion 34 side are sealed with a metal gasket structure, and the gasket 12 is pressure-bonded while securing a large tightening torque by proper tightening at the time of screwing. Therefore, it is possible to prevent the occurrence of loosening, maintain high sealing performance, and reliably prevent external leakage. Even if loosening occurs, the sealing performance is not immediately lost, and the gasket 12 is clamped by retightening to restore the sealing performance and prevent leakage. Also during the piping construction, loosening of the body 10 and the cap 11 due to the reverse torque can be prevented.

  With the above configuration, even when the inner diameter (flow path diameter) φD3 of the cap 11 in FIG. 3 is increased, the thickness of the cap 11 can be sufficiently secured to improve the strength. ) According to the demand for a large flow rate when φD2 is increased in diameter, the inner diameter φD3 can be made larger while suppressing a decrease in diameter compared to the inner diameter φD2. In this case, since the gasket 12 is clamped by the opposing seal portion 16 outside the flow path 23, the gasket 12 is disengaged outside the inner diameter φD2, so that impurities of a large flow rate of fluid are suppressed while suppressing generation of particles. Can be removed.

  By preventing the cap 11 from loosening with respect to the body 10, excessive extension of the spring 14 after being mounted can be suppressed, and a decrease in the resilience of the spring 14 can be prevented. As a result, the sealing force between the filter element 13 and the sealing mechanism 15 is maintained, the generation of a gap between the opening 41 and the packing 42 is prevented, and a hermetically sealed state is ensured. Even when a fluid such as a fluid flows, stable and reliable filter performance can be maintained.

  When the gasket 12 is made of a material having a hardness lower than that of the body 10 and the cap 11, the seal surfaces 25 and 35 are in surface contact with the gasket 12 when the body 10 and the cap 11 are unscrewed for maintenance or the like. Therefore, the sealing performance can be recovered by replacing the gasket 12.

The mounting structure of the filter element 13 via the spring 14 makes it easy to attach and detach the filter element 13, and also facilitates maintenance such as replacement and cleaning.
By engaging one end of the spring 14 with the stepped portion 38 having a diameter larger than the flow path diameter φD3 of the cap 11, the pressure of the high-pressure fluid is prevented from being directly transmitted in the direction of springing of the spring 14, and the flow path diameter φD3. Can be secured with a large flow rate. Since the other end of the spring 14 is elastically contacted with the outer peripheral side position of the bottomed portion 40 of the filter element 13, the elastic force of the spring 14 is directly transmitted to the cylindrical portion of the filter element 13, and the opening 41 and The pressure-contact force with the seal mechanism 15 can be increased to improve the sealing performance by the packing 42. Since the degree of freedom in designing the flow path diameters φD2 and φD3 is increased, a large flow path can be secured while maintaining the overall compactness.

  FIG. 4 shows a hydrogen station using the high-pressure filter device of the present invention. The hydrogen station has, for example, a pressure accumulator 70, a compressor 71, a dispenser 72, a precool heat exchanger 73, a quick joint 74, a filling hose 75, a filling nozzle 76, an on-vehicle tank 77, and a high pressure check valve 79. Constitutes a system as a high-pressure hydrogen supply line 78.

  The apparatus main body 90 that is the high-pressure filter apparatus of the present invention is provided as an inline type, for example, on the primary side of the filling nozzle 76, or provided at other locations on the supply line 78. By providing the apparatus main body 90, external leakage can be prevented even when an ultrahigh pressure fluid flows, and excellent filtration performance can be maintained.

Note that a manual valve 81 is provided at a connection portion of each unit of the hydrogen station, and an automatic valve 80 is appropriately provided on the primary side or the secondary side of each unit.
The interior of the pressure accumulator 70 is divided into a plurality of tanks. By appropriately switching the automatic valve 80 that connects each tank and the compressor 71 and the automatic valve 80 that connects each tank and the dispenser 72, Hydrogen is supplied to the dispenser from a tank that has reached a predetermined pressure, while a tank that has fallen below a predetermined lower limit pressure is filled with hydrogen from the compressor 71 until the predetermined pressure is reached. In the supply line 78 provided in the hydrogen station, the hydrogen supply is controlled by a predetermined program, and the hydrogen supply can be appropriately controlled according to the vehicle supply amount.

DESCRIPTION OF SYMBOLS 10 Body 11 Cap 12 Gasket 13 Filter element 14 Spring 15 Seal mechanism 16 Opposing seal part 20, 30 Pipe joint part 22 Cylindrical space part 23 Flow path 25, 35 Seal surface 26, 36 Edge seal part 38 Step part 40 Bottomed part 41 Opening Portion 42 Packing 43 Holder 44 Channel hole 90 Device body φD3 Cap channel diameter

Claims (6)

  A body having a pipe joint and a cap having a pipe joint are screwed together via an opposing seal part, and the opposing seal part is an edge seal having an obtuse angle in the inner circumferential direction of the seal surface between the body and the cap Each part is formed and a gasket is sandwiched between the two edge seal parts, and the cylindrical space provided in the flow passage of the body has a bottomed part on the primary side and an opening on the secondary side. A high pressure filter device comprising: a filter element having a portion, wherein the bottomed portion is pressed by a spring, and the opening is hermetically sealed by a seal mechanism.   2. The high-pressure filter device according to claim 1, wherein one end of the spring is engaged with a stepped portion having a diameter larger than a flow path diameter of the cap, and the other end is elastically contacted with an outer peripheral side position of the bottomed portion of the filter element. .   3. The seal mechanism according to claim 1, wherein the seal mechanism is a mechanism that is held by a holder having a packing provided at an opening of the filter element and a flow path hole that sandwiches the seal, and is hermetically sealed by the elastic force of the spring. High pressure filter device.   The high-pressure filter device according to any one of claims 1 to 3, wherein the filter element is a sintered body made of stainless steel or a stainless alloy.   The high-pressure filter device according to any one of claims 1 to 4, wherein the obtuse edge seal portion has a mountain shape with a cross section of 160 to 178 degrees, and the gasket is sandwiched between the mountain shapes. .   A hydrogen station, wherein the high-pressure filter according to claim 1 is used in a high-pressure hydrogen supply line.

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