JP2017045176A - Pressure regulating valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure regulating valve capable of maintaining a pressure regulating function.SOLUTION: Disclosed is a multi-stage pressure regulating valve 10 which includes: an upstream pressure regulating valve 1 for decompressing fuel gas G; a downstream pressure regulating valve 2 which is arranged at a position of the downstream side in the flow direction of the fuel gas G with respect to the upstream pressure regulating valve 1 and decompresses the fuel gas G; and a middle passage 3 into which the fuel gas G after decompression by the upstream pressure regulating valve 1 and before decompression by the downstream pressure regulating valve 2 flows. In this multi-stage pressure regulating valve, a trap passage 32 is provided which is branched from the middle passage 3 and can capture foreign matter in the middle passage 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure adjusting valve that adjusts a fuel gas supplied from a fuel tank to a supply destination to a desired pressure while reducing the pressure.

  Patent Document 1 discloses a regulator having a first pressure reducing valve, a second pressure reducing valve, and a connection passage through which gaseous fuel passes after pressure reduction by the first pressure reducing valve and before pressure reduction by the second pressure reducing valve. Yes.

JP 2013-204441 A

  In the regulator of Patent Document 1, when foreign matter such as wear powder generated in the first pressure reducing valve flows into the second pressure reducing valve, the foreign matter enters the sliding portion of the second pressure reducing valve, and the sliding portion slides. It may become unstable and the pressure adjustment function may be reduced.

  Therefore, the present invention has been made to solve the above-described problems, and an object thereof is to provide a pressure adjusting valve capable of maintaining a pressure adjusting function.

  One aspect of the present invention made to solve the above problems includes an upstream pressure regulating valve for decompressing a fluid, and the fluid disposed at a position downstream of the upstream pressure regulating valve in the fluid flow direction. A pressure regulating valve having a downstream pressure regulating valve that depressurizes, and a middle passage into which the fluid flows after being decompressed by the upstream pressure regulating valve and before being decompressed by the downstream pressure regulating valve, and is branched from the middle passage. And a trap passage capable of catching foreign matter in the middle passage.

  According to this aspect, since the foreign matter in the fluid flowing through the middle passage is captured and stored in the trap passage, it is suppressed from flowing into the downstream pressure regulating valve. Therefore, the possibility that foreign matter enters the sliding portion of the downstream pressure regulating valve is reduced. Therefore, the pressure adjustment function of the pressure adjustment valve is maintained.

  In the above aspect, a relief valve that controls the pressure in the middle passage to be less than a predetermined set pressure, and a relief passage that allows the middle passage and the relief valve to communicate with each other, the trap passage includes the relief passage. It is preferable to be formed coaxially with the passage.

  According to this aspect, the trap passage can be formed simultaneously with the relief passage. Therefore, processing becomes easy and processing costs are reduced.

  In the above aspect, there is a body member in which the upstream pressure regulating valve, the downstream pressure regulating valve, the middle passage, and the trap passage are formed, and an end of the trap passage opposite to the middle passage side The part is preferably closed with respect to the outside of the body member.

  According to this aspect, parts and work man-hours for sealing the trap passage become unnecessary, and thus the processing cost is more effectively reduced.

  In said aspect, it is preferable that the said trap channel | path is formed toward the direction which gravity branches from the said middle channel | path.

  According to this aspect, the foreign matter in the fluid flowing through the middle passage is captured and stored in the trap passage more effectively.

  According to the pressure regulating valve of the present invention, the pressure regulating function can be maintained.

It is sectional drawing of the multistage pressure regulating valve of this embodiment.

<Configuration of multistage pressure regulating valve>
First, the structure of the multistage pressure regulating valve 10 of this embodiment will be described. As shown in FIG. 1, the multistage pressure adjusting valve 10 is a pressure adjusting valve that adjusts the fuel gas G to a desired pressure while reducing the pressure in multiple stages. The multistage pressure regulating valve 10 has a body member 7 made of an aluminum alloy. The body member 7 is formed with a part of the upstream pressure regulating valve 1, a downstream pressure regulating valve 2, an intermediate passage 3, and a check valve 4.

  The upstream pressure regulating valve 1 is disposed at a position upstream of the downstream pressure regulating valve 2 in the flow direction of the fuel gas G (the direction of the arrow shown in FIG. 1). The downstream pressure regulating valve 2 is disposed at a position downstream of the upstream pressure regulating valve 1 in the flow direction of the fuel gas G. Such an upstream pressure regulating valve 1 and a downstream pressure regulating valve 2 are connected in series via an intermediate passage 3. The middle passage 3 is a passage through which the fuel gas G flows after being decompressed by the upstream pressure regulating valve 1 and before decompressing by the downstream pressure regulating valve 2. The check valve 4 (relief valve) is connected to the middle passage 3 and controls the pressure in the middle passage 3 to be lower than a predetermined set pressure.

  The fuel gas G is, for example, hydrogen gas supplied to a fuel cell (not shown). A main stop valve (not shown) for supplying or stopping the fuel gas G stored in a fuel tank (not shown) is connected to the upstream side of the multistage pressure regulating valve 10. Further, an injector (not shown) that supplies the fuel cell with fuel gas G adjusted to a desired pressure is connected to the downstream side of the multistage pressure regulating valve 10. The fuel gas G stored in the fuel tank may be filled at a pressure of about 80 to 90 MPa depending on the filling equipment. On the other hand, the pressure of the fuel gas G supplied from the multistage pressure regulating valve 10 to the injector is reduced to a pressure of about 1.0 to 1.5 MPa. Therefore, the multistage pressure regulating valve 10 depressurizes the fuel gas G from about 80 to 90 MPa to about 3.0 to 5.0 MPa by the upstream pressure regulating valve 1 and about 3 to about 3.0 to 5.0 MPa, for example. The pressure is reduced from about 3.0 to 5.0 MPa to about 1.0 to 1.5 MPa.

(Upstream pressure regulating valve)
The upstream pressure regulating valve 1 includes a pressure regulating chamber 11, a valve chamber 12, a valve body 13, a valve seat 14, a piston 15, a coil spring 16, a holding member 17, a stop member 18, and the like. .

  The pressure regulation chamber 11 is formed at a position below the valve seat 14 (a direction downstream of the flow direction of the fuel gas G with respect to the valve seat 14), and the valve body 13 is located above (on the opposite side of the valve seat 14). The valve chamber 12 communicates with the valve chamber 12 when moving in the direction). The valve chamber 12 communicates with the inlet 8. The valve body 13 moves up and down in the valve chamber 12. The valve seat 14 is formed at the lower end of the valve chamber 12 and abuts and separates from the valve body 13. The piston 15 is arranged at the tip of the urging direction of the valve spring 133 with respect to the valve body 13 and moves up and down in the pressure regulating chamber 11. The coil spring 16 urges the piston 15 upward (in the direction toward the valve body 13). The holding member 17 is in contact with the lower end of the coil spring 16 and holds the coil spring 16. The stop member 18 is screwed to the body member 7 in a state where the height of the holding member 17 can be adjusted.

  An inlet passage 81 is formed between the inlet 8 and the valve chamber 12. A filter 30 is provided on the upstream side of the inlet passage 81. The filter 30 is formed in a hollow cylindrical shape with an open end on the downstream side (right end in FIG. 1), and is a member that prevents foreign matter from entering the multistage pressure regulating valve 10. The filter 30 is fixed by a holding spring 31. The fuel gas G flowing from the inlet 8 passes from the outside to the inside of the filter 30 and flows out to the valve chamber 12 through the inlet passage 81.

  Between the valve chamber 12 and the valve body 13, a valve spring 133 that biases the valve body 13 downward (in the direction toward the valve seat 14) is disposed. The valve body 13 includes a cylindrical main body portion 134, a conical tapered portion 132, and a needle-like needle portion 131. A valve spring 133 is attached to the main body 134. The tapered portion 132 is formed below the main body portion 134 (in the direction toward the valve seat 14), and is a portion that contacts the valve seat 14. The needle portion 131 is formed below the taper portion 132 (in the direction toward the piston 15), and extends through the through hole 141 formed in the valve seat 14 to the pressure regulating chamber 11. The lower end of the needle portion 131 is in contact with the distal end surface of the shaft protrusion 153 provided in a state of protruding from the upper end (end on the valve body 13 side) of the main body portion of the piston 15.

  The valve body 13 is provided with annular sliding members 135a and 135b. The valve body 13 is disposed in the valve chamber 12 with these sliding members 135 a and 135 b in contact with the inner peripheral surface of the valve chamber 12. Thereby, the sliding members 135a and 135b and the inner peripheral surface of the valve chamber 12 slide and the valve body 13 tilts without the outer peripheral surface of the valve body 13 contacting the inner peripheral surface of the valve chamber 12. Instead, the valve chamber 12 is moved up and down. As the sliding members 135a and 135b, for example, a resin material such as PTFE can be used.

  Further, the valve body 13 includes a portion formed at a position upstream of the valve body 13 in the valve chamber 12 and a portion formed at a position downstream of the valve body 13 in the valve chamber 12. An internal passage 136 for communication is formed.

  An annular seal member 151 that seals the pressure regulating chamber 11 in contact with the inner circumferential surface of the pressure regulating chamber 11 is disposed on the outer circumferential surface of the main body portion of the piston 15. The annular seal member 151 has a lip-shaped cross section that opens upward (in the direction of the pressure regulating chamber 11 side) in a V shape. A spring seat 154 that holds the coil spring 16 is formed in a concave shape at the lower end of the piston 15. A sliding member 152 made of fluororesin is mounted on the outer peripheral surface of the spring seat 154. A filter member 19 is locked to the stop member 18. The pressure regulating chamber 11 is communicated with the valve chamber 22 of the downstream pressure regulating valve 2 through the middle passage 3 as will be described later.

(Downstream pressure regulating valve)
The downstream pressure regulating valve 2 includes a pressure regulating chamber 21, a valve chamber 22, a piston 24, a valve body 241, a coil spring 25, a valve seat 26, a stop member 27, an adjusting screw 28, and the like. .

  The pressure regulating chamber 21 communicates with the outlet 6 formed in the body member 7. The valve chamber 22 is formed at a position below the pressure regulating chamber 21 (upstream in the flow direction of the fuel gas G with respect to the pressure regulating chamber 21). The piston 24 moves up and down in the pressure regulating chamber 21. The valve body 241 is formed in a substantially cylindrical shape, and is provided up to the valve chamber 22 along the central axis direction of the piston 24. The coil spring 25 urges the piston 24 upward (in the direction toward the lid member 23). The valve seat 26 is formed at the lower end of the valve chamber 22, and the lower end portion 2414 of the valve body 241 contacts and separates. The stop member 27 is fitted into the body member 7 at the position of the lower right end of the body member 7. A valve seat 26 is fitted inside the inner peripheral surface of the stop member 27. The adjustment screw 28 is screwed into the inner peripheral surface of the stop member 27 and attached. The height of the valve seat 26 can be adjusted by the adjusting screw 28.

  The pressure regulating chamber 21 is sealed by a lid member 23 that is fitted in the body member 7. Below the lid member 23 (in the direction toward the piston 24), a cylindrical convex portion 231 is formed that contacts the upper end portion of the piston 24 and restricts the upward movement of the piston 24. When the columnar convex portion 231 comes into contact with the upper end portion of the piston 24, an annular space is formed in the pressure regulating chamber 21. Between the pressure regulating chamber 21 and the outlet 6, an outlet passage 61 that communicates both is formed horizontally.

  A cylindrical through hole 2411 is formed from the upper end portion of the piston 24 to the lower end portion of the valve body 241 at the axial center of the piston 24 and the valve body 241. An annular seal member 242 that contacts the inner circumferential surface of the pressure regulating chamber 21 and seals the pressure regulating chamber 21 is disposed on the outer circumferential surface of the main body portion of the piston 24. The annular seal member 242 has a lip-shaped cross section that opens upward (in the direction toward the pressure regulating chamber 21) in a V shape. A spring seat 246 that holds the coil spring 25 is formed in a concave shape at the lower end of the piston 24. The coil spring 25 is a cylindrical compression spring. The position of the lower end of the coil spring 25 is regulated by a holding portion 247 formed integrally with the body member 7.

  An annular seal member 243 that seals the valve chamber 22 in contact with the outer peripheral surface of the valve body 241 is disposed below the holding portion 247. The annular seal member 243 has a lip-shaped cross section that opens downward (in the direction toward the valve chamber 22) in a V shape. A bearing portion 245 that supports the valve body 241 so as to be movable in the vertical direction is mounted below the annular seal member 243. The bearing portion 245 also serves as a drop stopper for the annular seal member 243. The valve chamber 22 is formed in a substantially cylindrical shape below the bearing portion 245.

(Middle aisle)
The middle passage 3 is formed linearly between the pressure regulating chamber 11 of the upstream pressure regulating valve 1 and the valve chamber 22 of the downstream pressure regulating valve 2. The middle passage 3 is formed with the same inner diameter throughout. The body member 7 is formed with a middle passage machining hole 72 for machining the middle passage 3. A sealing member 9 is sealed to the outer wall surface 71 of the body member 7 to seal the middle passage processing hole 72. A check valve 4 described later is provided above the middle passage 3.

  Between the middle passage 3 and the check valve 4, a check valve inlet passage 52 (relief passage) that allows the middle passage 3 and the check valve 4 to communicate with each other is formed in the vertical direction. In the present embodiment, the check valve inlet passage 52 is formed such that the central axis direction thereof is orthogonal to the central axis direction of the middle passage 3. Further, the inner diameter of the check valve inlet passage 52 is the same as the inner diameter of the middle passage 3.

  In the present embodiment, a trap passage 32 branched from the middle passage 3 is formed. The trap passage 32 is formed such that its central axis direction is orthogonal to the central axis direction of the middle passage 3. The trap passage 32 is formed coaxially with the check valve inlet passage 52. That is, the central axis of the trap passage 32 coincides with the central axis of the check valve inlet passage 52. Further, the end 32 a of the trap passage 32 opposite to the middle passage 3 side is closed against the outside of the body member 7. That is, the trap passage 32 does not penetrate the body member 7. The trap passage 32 formed in this way can capture foreign matter in the middle passage 3 as will be described later. The trap passage 32 is preferably formed in a direction that branches from the middle passage 3 and in which gravity acts.

  In FIG. 1, as an example, the inner diameter of the trap passage 32 is the same as the inner diameter of the middle passage 3. The depth of the trap passage 32 (length in the central axis direction) is 1.3 to 1.7 times the inner diameter of the middle passage 3.

(Check valve)
The check valve 4 includes a valve chamber 41, an inlet portion 42 of the valve chamber 41, a valve body 43 that is accommodated in the valve chamber 41 and contacts and separates from the inlet portion 42, and the valve body 43 is attached to the inlet portion 42. A pressing spring 44 is provided, and a holding member 46 that holds the pressing spring 44 is provided. A check valve outlet space 50 and a check valve outlet passage 51 are formed between the valve chamber 41 and the pressure regulating chamber 21 of the downstream pressure regulating valve 2 to allow the valve chamber 41 and the pressure regulating chamber 21 to communicate with each other. Yes. The check valve outlet passage 51 is formed coaxially with the outlet passage 61. The valve body 43 is formed with an internal passage 431 that communicates the upstream side and the downstream side of the valve chamber 12.

<Operation of multistage pressure regulating valve>
Next, the operation (operation method) of the multistage pressure regulating valve 10 of the present embodiment will be described. As shown in FIG. 1, for example, when the supply of the fuel gas G to the vehicle fuel cell is started and the fuel gas G flows out from the outlet 6 in the direction of the arrow, the inside of the pressure regulating chamber 21 of the downstream pressure regulating valve 2. The pressure of the fuel gas G stored in the tank decreases. When the pressure of the fuel gas G in the pressure regulating chamber 21 decreases, the fuel gas G in the valve chamber 22 is supplied into the pressure regulating chamber 21 via the piston 24 and the through hole 2411 formed in the valve body 241. The pressure in the pressure regulating chamber 21 increases. When the pressure in the pressure regulating chamber 21 reaches a desired pressure, the piston 24 pushes down the coil spring 25, the lower end 2414 of the valve body 241 comes into contact with the valve seat 26, and the fuel gas G from the valve chamber 22 enters. Supply stops. Note that the pressure in the pressure regulating chamber 21 can be set to a desired value (final pressure) by adjusting the screwing amount of the adjusting screw 28 in advance.

  When the pressure of the fuel gas G in the valve chamber 22 decreases, the valve chamber 22 and the pressure regulating chamber 11 are communicated with each other by the middle passage 3, so that the fuel gas G stored in the pressure regulating chamber 11 is in the direction of the arrow. Along the middle passage 3.

  At this time, in the present embodiment, when the fuel gas G flowing through the middle passage 3 contains foreign matter, the foreign matter moves into the trap passage 32 and is stored in the trap passage 32. It is trapped in the trap passage 32. In addition, as a foreign material in the fuel gas G which flows through the inside channel | path 3, the abrasion powder of the sliding part of the valve body 13 and the piston 15 in the upstream pressure regulating valve 1, a foreign material in a fuel tank, etc. are considered, for example. The sliding portion of the valve body 13 is a contact portion between the sliding members 135 a and 135 b and the inner peripheral surface of the valve chamber 12. Further, the sliding portion of the piston 15 is a contact portion between the annular seal member 151 and the inner peripheral surface of the pressure regulating chamber 11.

  As described above, when the fuel gas G stored in the pressure regulating chamber 11 flows into the middle passage 3, the pressure in the valve chamber 22 increases. At this time, since the pressure in the pressure regulating chamber 11 of the upstream pressure regulating valve 1 decreases, the urging force of the coil spring 16 that urges the piston 15 moves the valve body 13 of the upstream pressure regulating valve 1 upward.

  When the valve body 13 moves upward and is separated from the valve seat 14, the high-pressure fuel gas G supplied from the fuel tank to the inlet 8 is regulated through the inlet passage 81, the internal passage 136 and the valve chamber 12. It is supplied into the chamber 11. By supplying the fuel gas G into the pressure regulating chamber 11 in this way, the pressure of the fuel gas G in the pressure regulating chamber 11 is maintained at a predetermined value. In addition, the pressure in the pressure regulation chamber 11 can be set to a predetermined value by adjusting the screwing amount of the stopper member 18 in advance.

  On the other hand, when the supply of the fuel gas G to the fuel cell is stopped, the pressure of the fuel gas G stored in the pressure regulating chamber 21 of the downstream pressure regulating valve 2 does not decrease. Therefore, there is no escape space for the fuel gas G leaking from the upstream pressure regulating valve 1 to the middle passage 3, and the pressure in the middle passage 3 increases. When the pressure of the fuel gas G in the intermediate passage 3 becomes equal to or higher than a predetermined set pressure, the valve body 43 of the check valve 4 is separated from the inlet portion 42 and the check valve 4 operates. At this time, the fuel gas G is discharged from the middle passage 3 into the valve chamber 41 of the check valve 4 via the check valve inlet passage 52. Therefore, the fuel gas G is overloaded to the annular seal member 151 that seals the pressure regulating chamber 11 of the upstream pressure regulating valve 1 facing the middle passage 3 and the annular seal member 243 that seals the valve chamber 22 of the downstream pressure regulating valve 2. Can be avoided. The fuel gas G released into the valve chamber 41 of the check valve 4 is adjusted in the internal passage 431 of the valve body 43, the check valve outlet space 50, the check valve outlet passage 51, and the downstream pressure regulating valve 2. The pressure is supplied to the outlet 6 via the pressure chamber 21 and the outlet passage 61.

<Effect>
The multistage pressure regulating valve 10 of the present embodiment as described above has a trap passage 32 that branches off from the middle passage 3 and can trap foreign matter in the middle passage 3.

  As a result, the foreign matter in the fuel gas G flowing through the intermediate passage 3 is captured and stored in the trap passage 32, so that it is suppressed from flowing into the downstream pressure regulating valve 2. Therefore, the possibility that foreign matter enters the sliding portion of the downstream pressure regulating valve 2 (for example, the contact portion between the inner peripheral surface of the pressure regulating chamber 21 and the annular seal member 242) is reduced. Accordingly, since the movement of the piston 24 is stabilized, the pressure adjusting function of the multistage pressure adjusting valve 10 is maintained.

  Further, in the passage between the pressure regulating chamber 11 of the upstream pressure regulating valve 1 and the valve chamber 22 of the downstream pressure regulating valve 2, the volume of the trap passage 32 is further added to the volume of the middle passage 3. Therefore, the pulsation of pressure that can be generated when the injector is operated is suppressed by the middle passage 3 and the trap passage 32, and is thus difficult to be transmitted to the pressure regulating chamber 11. Therefore, in the upstream pressure regulating valve 1, the occurrence of pressure pulsation in the pressure regulating chamber 11 and the valve chamber 12 is suppressed, so that the movement of the valve body 13 and the piston 15 is stabilized, and the sliding of the valve body 13 and the piston 15 is performed. Wear of moving parts is suppressed. Therefore, the durability reliability in the upstream pressure regulating valve 1 is improved.

  Furthermore, when the valve body 13 is in contact with the valve seat 14, there is a slight leakage of the fuel gas G from the valve chamber 12 side to the pressure regulating chamber 11 side between the valve body 13 and the valve seat 14. Is assumed. Then, in this case, when the injector is stopped, the pressure in the middle passage 3 gradually increases. When the pressure in the intermediate passage 3 increases to a predetermined set pressure or higher, the fuel gas G is released from the intermediate passage 3 through the check valve 4. Here, in this embodiment, since the volume of the trap passage 32 is further added to the volume of the middle passage 3, it takes time until the pressure of the middle passage 3 increases to a predetermined set pressure or more. Therefore, the time until the fuel gas G is released from the check valve 4 is delayed.

  The trap passage 32 is formed coaxially with the check valve inlet passage 52. Thereby, the trap passage 32 can be formed simultaneously with the check valve inlet passage 52. Furthermore, when the check valve inlet passage 52 is processed, the management of the accuracy of the protrusion amount of the processing tool (for example, a drill) to the middle passage 3 is eased. Therefore, processing becomes easy and processing costs are reduced.

  Further, the end 32 a of the trap passage 32 opposite to the middle passage 3 side is closed against the outside of the body member 7. This eliminates the need for parts and work man-hours for sealing the trap passage 32, so that the processing cost is more effectively reduced.

  Moreover, it is desirable that the trap passage 32 is formed in a direction branched from the middle passage 3 and in which gravity acts. Thereby, the foreign matter in the fuel gas G flowing through the middle passage 3 is captured and stored in the trap passage 32 more effectively.

  It should be noted that the above-described embodiment is merely an example and does not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention.

1 upstream pressure regulating valve 2 downstream pressure regulating valve 3 middle passage 4 check valve 7 body member 10 multistage pressure regulating valve 11 pressure regulating chamber 13 valve body 15 piston 22 valve chamber 24 piston 32 trap passage 32a end 52 check valve inlet Passage 135a, 135b Sliding member 151 Annular seal member 152 Sliding member 242 Annular seal member G Fuel gas

Claims (4)

An upstream pressure regulating valve that depressurizes the fluid, a downstream pressure regulating valve that is disposed downstream of the upstream pressure regulating valve in the fluid flow direction and depressurizes the fluid, and after decompression by the upstream pressure regulating valve A pressure adjusting valve having a middle passage through which the fluid before pressure reduction by the downstream pressure adjusting valve flows,
Having a trap passage branched from the middle passage and capable of capturing foreign matter in the middle passage;
Pressure regulating valve characterized by The pressure regulating valve of claim 1,
A relief valve for controlling the pressure in the middle passage to be less than a predetermined set pressure;
A relief passage for communicating the intermediate passage with the relief valve;
The trap passage is formed coaxially with the relief passage;
Pressure regulating valve characterized by The pressure regulating valve according to claim 1 or 2,
A body member in which the upstream pressure regulating valve, the downstream pressure regulating valve, the middle passage, and the trap passage are formed;
An end of the trap passage opposite to the middle passage is closed with respect to the outside of the body member;
Pressure regulating valve characterized by The pressure regulating valve according to any one of claims 1 to 3,
The trap passage is formed in a direction in which gravity branches by branching from the middle passage;
Pressure regulating valve characterized by

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