JP4490243B2 - Injector silencer - Google Patents

Description

  The present invention relates to a silencer that silences sound generated by an injector that injects gas, and more particularly to a silencer that is suitable for silencer of an injector applied to a fuel cell system.

In recent years, various measures have been taken to reduce the sound generated from an injector. For example, Patent Document 1 proposes a technique in which an injector is covered with a soundproof wall and transmission of operating sound of the injector to the outside is blocked.
Japanese Patent Laid-Open No. 10-318080

However, in the above-described prior art, an injector is used to supply fuel. However, in the case of an injector that injects gas, the gas injected outside also causes noise. Furthermore, if gas leaks from the gap between the devices that cover the injector, it becomes a cause of noise. In particular, in a fuel cell system, it is preferable to use an injector as a means for optimizing the pressure of air that is a reaction gas supplied to the fuel cell. In such a case, noise reduction of the injector is an important problem. Become.
Moreover, in the prior art, although the operating noise of the injector can be reduced, it is not sufficient to block the vibration noise from the injector.

  Therefore, an object of the present invention is to provide a silencer for an injector that can reduce not only the operation sound of the injector but also the noise caused by the gas injection sound and gas leakage sound. Another object of the present invention is to provide a silencer for an injector that can reduce noise caused by vibration noise of the injector.

  The invention according to claim 1 includes an injector for injecting a gas introduced into the inside (for example, the air injector 36 in the embodiment), and a guide portion for covering the injector and guiding the gas injected from the injector (for example, The first housing (for example, the first case 21 in the embodiment) in which the guide path 27 and the guide hole 28 in the embodiment are formed, and the portion where the gas guided from the guide portion is introduced. A sound absorbing material (for example, the sound absorbing material 31 in the embodiment) and a second hole that accommodates the sound absorbing material and discharges the introduced gas (for example, the discharging hole 35 in the embodiment). A housing (for example, the second case 22 in the embodiment), and at least a portion injecting gas in the injector (for example, in the embodiment) A jetting section 40) and the seal member for sealing the guide portion in the first housing (e.g., characterized in that a seal member 24) in the embodiment.

  According to the present invention, the gas injected from the injector is guided to the guide portion of the first casing in a state in which the gas is prevented from flowing into other parts by the seal member, and the second Introduced in the housing. Therefore, the gas injected from the injector can be surely guided to the guide portion by the seal member and introduced into the second casing, so that gas leakage from the injector can be prevented and leakage sound can be prevented. Occurrence can be prevented. Further, the gas introduced into the second casing passes through the sound absorbing material, and at this time, the generated sound of the gas is absorbed, and then the gas passes through the discharge hole to the second casing. It is discharged outside. Further, the operating sound of the injector is blocked from being transmitted to the outside by the first casing and the second casing. Therefore, in addition to the operation sound of the injector, noise due to the gas injection sound and leakage sound can be reduced.

The invention according to claim 2 is the invention according to claim 1, wherein a cushioning material (for example, the cushioning materials 25 and 26 in the embodiment) is interposed between the injector and the first housing. It is characterized by that.
According to the present invention, when the injector operates and vibrates, the vibration can be absorbed by the buffer material, so that noise due to the vibration sound of the injector can be reduced.

Further , the sound absorbing material is formed with an introduction path for introducing the gas guided from the guide portion (for example, the introduction path 32 in the embodiment).
According to this invention, by forming the introduction path, the area where the sound absorbing material is exposed to the gas when the gas is introduced into the second housing can be expanded, By entering the sound absorbing material without resistance, it is possible to prevent gas from leaking between the seal member and the first housing, and the gas can be easily introduced into the sound absorbing material. The sound-absorbing effect due to the gas can be enhanced, and the noise due to the gas injection sound can be further reduced.

The invention according to claim 3 is the one according to claim 1 or 2 , wherein the seal member is a gel substance.
According to the present invention, since the gel-like substance has both a sealing property and a buffering property, the sealing member can also have a function as a buffering material, and noise due to vibration noise of the injector can be reduced. it can. Moreover, since the gel-like substance can be flexibly changed in shape, the assemblability can be improved.

The invention according to a fourth aspect is the one according to the second aspect , wherein the cushioning material is a gel substance.
According to this invention, since the gel-like substance has both a sealing property and a buffering property, the buffering material can also have a function as a sealing member, and noise due to gas leakage noise can be reduced. it can. Moreover, since the gel-like substance can be flexibly changed in shape, the assemblability can be improved.

According to the invention which concerns on Claim 1, in addition to the operation sound of the said injector, the noise by the injection sound of said gas and a leak sound can be reduced. In addition, it is possible to reduce the leakage sound and the sound absorption effect by the sound absorbing material, and further reduce the noise due to the gas injection sound.
According to the invention of claim 2, Ru can reduce noise caused by vibration sound of the injector.
According to the invention of 請 Motomeko 3, it is possible to reduce noise caused by vibration sound of the injector. In addition, the assemblability can be improved.
According to the invention which concerns on Claim 4 , the noise by the leak sound of gas can be reduced. In addition, the assemblability can be improved.

Hereinafter, an injector silencer according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a fuel cell system to which an injector silencer according to an embodiment of the present invention is applied. As shown in the figure, the fuel cell 1 has a large number of cells in which an anode electrode and a cathode electrode are provided on both sides of a solid polymer electrolyte membrane, and gas passages for supplying a reaction gas are provided outside each electrode. It is configured by stacking.
The fuel cell 1 generates power by supplying hydrogen gas as a fuel gas to the anode electrode and supplying air as an oxidant gas to the cathode electrode.

  The air is pressurized by the air compressor 2 and supplied to the cathode electrode of the fuel cell 1. After oxygen in the air is supplied as an oxidant, the air is discharged from the fuel cell 1 as air off-gas and is passed through the pressure control valve 4. Released into the atmosphere. The ECU 10 drives the air compressor 2 to supply a predetermined amount of air to the fuel cell 1 and controls the pressure control valve 4 in accordance with the output required for the fuel cell 1 (hereinafter, required output). The air supply pressure at the cathode electrode is adjusted to a pressure corresponding to the required output of the fuel cell 1.

  On the other hand, the hydrogen gas released from the high-pressure hydrogen tank 30 is decompressed by the regulator 5, passes through the ejector 6, and is supplied to the anode electrode of the fuel cell 1. After this hydrogen gas is used for power generation, it is discharged from the fuel cell 1 as hydrogen off-gas, sucked into the ejector 6 through the hydrogen off-gas recovery path 11, and merged with the hydrogen gas supplied from the high-pressure hydrogen tank to re-fuel. The battery 1 is supplied and circulated.

  The regulator 5 is composed of, for example, a pneumatic proportional pressure control valve, and is input via the air signal introduction path 15 using the pressure of air supplied from the air compressor 2 as a signal pressure, and the pressure of the hydrogen gas at the outlet of the regulator 5 is Depressurization control is performed so as to be within a predetermined pressure range corresponding to the signal pressure. In the present embodiment, control is performed so that a predetermined pressure (for example, three times) of the signal pressure becomes the pressure at the outlet of the regulator 5 with reference to the atmospheric pressure.

A regulator pressure sensor 35 is provided on the upstream side of the regulator 5 in the air signal introduction path 15 connected to the regulator 5. An air flow path 39 is branched downstream of the regulator pressure sensor 35, and an air injector 36 is provided in the air flow path 39. The opening degree of the air injector 36 is adjusted by the ECU 10.
The hydrogen off gas recovery path 11 is connected to a hydrogen off gas discharge path 12 via a purge valve 8. The purge valve 8 has an action of draining so that water does not accumulate on the anode electrode side of the fuel cell 1.

  The injector silencer applied to the fuel cell system as described above will be described with reference to FIG. As shown in the figure, the injector silencer 20 includes a first case 21 that covers the air injector 36 and a second case 22 that is provided integrally therewith. The first case 21 includes a main body portion 21a formed in a substantially cylindrical shape, and a protruding portion 21b having a diameter smaller than that of the main body portion 21a and protruding above the main body portion 21a. The air injector 36 is disposed in the first case 21 so that the axial center position of the main injector 21a and the protruding portion 21b of the first case 21 are substantially matched. The air injector 36 is accommodated in the first case 21 in a state of being separated from the main body portion 21 a and the protruding portion 21 b of the first case 21.

  A power supply connector 23 is attached to the air injector 36. When power is supplied from the ECU 10 via the connector 23, the air injector 36 is activated to inject air flowing from the air flow path 39. The air injector 36 incorporates a valve body (not shown) that can approach and separate from the bottom surface of the main body 21a along the axial direction. Normally, the valve body of the air injector 36 is urged in a direction in which the internal air flow path is closed by a spring (not shown) wound around the valve body. When power is supplied to the air injector 36 via the connector 23, electromagnetic force is generated by a built-in coil (not shown), and the valve body is separated from the bottom surface of the main body 21a against the biasing force of the spring. It is moved in the direction to do. Thereby, the air flow path inside the air injector 36 is opened. At this time, air is injected from an air injection unit 40 formed on the lower surface of the air injector 36.

In the first case 21, a guide path 27 that is connected to an air injection unit 40 formed on the lower surface of the air injector 36 and guides the air injected from the air injector 36 is formed. A guide hole 28 formed in the lower surface of the guide path 27 communicates with a communication hole 42 formed in the bottom surface of the main body portion 21a.
Further, the first case 21 has a discharge passage partition wall 37 protruding from one side surface thereof. An air discharge passage 41, which will be described later, is defined by the discharge passage partition wall 37 and the outer peripheral surface of the main body portion 21a facing the discharge passage partition wall 37.

  In the first case 21, a seal member 24 that seals the air injection portion 40 of the air injector 36 and the guide path 27 and the guide hole 28 in the first case 21 is provided. Further, buffer materials 26 and 27 are interposed between the first case 21 and the air injector 36 at a position above the seal member 24. The buffer materials 26 and 27 are formed in a substantially half shape with respect to the axial direction. The sealing member 24 and the cushioning materials 25 and 26 are gel substances.

  Here, a predetermined interval (interval L in FIG. 2) can be secured between the protrusion 21b formed in the first case 21 and the tip of the air injector 36, so that the protrusion 21b is located above the tip of the air injector 36. A certain amount of cushioning material 25, 26 can be provided. Since the cushioning members 25 and 26 are larger than the first case 21, the pressing force by the cushioning members 25 and 26 can be applied to the tip of the air injector 36, and the seal member 24 and the guide hole 28 are formed. It is possible to improve the adhesion between the bottom surface of the first case 21 and the seal member 24 and the buffer materials 25 and 26.

  The second case 22 is formed in a substantially cylindrical shape, and the diameter of the inner wall of the outer peripheral surface thereof is set to be substantially the same as the diameter of the inner wall of the outer peripheral surface of the first case. Further, an introduction hole 29 is opened at the axial center of the upper surface of the second case 22. And the 2nd case 22 is being fixed with the screw 46 with the bottom face part of the 1st case 21 in the state where the upper surface part made the position of the communicating hole 43 and the introduction hole 29 of the 1st case 21 correspond. . Accordingly, air is introduced into the second case 22 from the communication hole 43 of the first case 21 through the introduction hole 29 of the second case 22.

A sound absorbing material 31 is accommodated in the second case 22. As the sound absorbing material, for example, a melamine resin can be used. An introduction path 32 is formed in the sound absorbing material 31, and air guided from the guide hole 28 of the guide path 27 is introduced through the introduction path 32.
The second case 22 is formed with a cylindrical partition wall 33 having a diameter smaller than that of the inner wall of the outer peripheral surface. A communication hole 34 is formed in the partition wall 33 at a portion opposite to the portion where the air discharge passage 41 is formed as viewed from the axial direction and at a lower portion. Further, the second case 22 is formed with a diameter-expanded portion 44 at a portion that is substantially on the same side as the portion where the air discharge passage 41 is formed as viewed from the axial direction and at an upper portion. The enlarged diameter passage 45 formed in the enlarged diameter portion 44 is connected to the air discharge passage 41 via the discharge hole 35 formed in the second case 22 and the communication hole 42 formed in the first case 21. Is done. In the air discharge passage 41, an external discharge hole 38 is formed above through the sound absorbing material 31 '. The reason why the external discharge hole 38 is formed upward is to prevent water from entering.

  The operation of the injector silencer 20 configured as described above will be described. First, in a state where air flows from the air flow path 39 to the air injector 36 (arrow P1), when power is supplied from the connector 23, the air is ejected from the air injector 36 (arrow P2). The injected air is guided to the guide path 27 of the first case 21 in a state where the air is prevented from flowing into other parts by the seal member 24. Then, it is introduced into the second case 22 through the communication hole 34 and the introduction hole 29.

  The air introduced into the second case 22 is introduced into the sound absorbing material 31 through the introduction path 32. Then, the air introduced into the introduction path 32 travels through the sound absorbing material 31 and travels from the inner peripheral side to the outer peripheral side of the partition wall 41 through the communication hole 34 formed in the partition wall 41 (arrow P3). ) As it is, it moves to the opposite side in the axial direction along the outer peripheral side of the partition wall 41 (arrow P4). Subsequently, the outer periphery of the partition wall 41 is advanced from the lower side to the upper side of the second case 22 (arrow P5), and the air discharge passage 41 is advanced upward from the enlarged diameter passage 45 via the discharge hole 35 and the communication hole 43. It is discharged outside through the external discharge hole 38 (arrow P6).

In this way, the air injected from the air injector 36 can be reliably guided to the guide path 27 by the seal member 24 and introduced into the second case 22 from the guide hole 28. Therefore, the air injector It is possible to prevent leakage of air from 36 and to prevent leakage sound.
Further, when the air injector 36 is actuated and vibrates, the vibration can be absorbed by the cushioning materials 25 and 26, so that the noise caused by the vibration sound of the air injector 36 can be reduced.

  As described above, the seal member 24 and the buffer materials 25 and 26 are gel substances. Since the gel-like substance has both a sealing property and a buffering property, the sealing member 24 can have a function as a buffering material, and the buffering materials 25 and 26 can have a function as a sealing member. Noise due to vibration sound of the injector 36 and noise due to air leakage sound can be reduced. Moreover, since the gel-like substance can be flexibly changed in shape, the assemblability can be improved.

By forming the introduction path 32, the area where the sound absorbing material 31 is exposed to the air when the air is introduced into the second case 22 can be expanded. Thereby, it is possible to prevent air from leaking between the seal member 24 and the case 21 by the injected air entering the sound absorbing material 31 without resistance, and to facilitate the introduction of air into the sound absorbing material 31. Therefore, the sound absorption effect by the sound absorbing material 31 can be enhanced, and the noise due to the air injection sound can be further reduced.
Further, as described above, by forming the partition wall 33, the communication hole 34, and the air discharge passage 41, the path of the air that travels through the sound absorbing material 31 is extended, so that the sound absorbing effect of the sound absorbing material 31 is further enhanced. This can further reduce noise caused by air injection sound. In addition, the communication hole 34 aims at reduction of a sound by giving a pressure loss to air.

  Of course, the contents of the present invention are not limited to the above-described embodiments. For example, in the above-described embodiment, the case where the air injector is silenced in the fuel cell system has been described, but the present invention can also be applied to an injector used other than the fuel cell system. Moreover, the gas injected from the injector is not limited to air. Further, in the present invention, the sealing member and the buffer material have been described as a gel substance, but the present invention is not limited to this, and the seal member may be, for example, rubber having a sealing function, and the buffer material also absorbs vibration. What can be used, such as urethane and rubber, may be used.

1 is a block diagram showing a fuel cell system to which an injector silencer according to an embodiment of the present invention is applied. FIG. It is a block diagram which shows the silencer of the injector in embodiment of this invention.

Explanation of symbols

20 ... injector silencer 21 ... first case (first housing)
22 ... 2nd case (2nd housing | casing)
24 ... Seal members 25, 26 ... Buffer material 27 ... Guide path (guide section)
28 ... Guide hole (Guide part)
31 ... Sound absorbing material 32 ... Introduction path 35 ... Discharge hole 36 ... Air injector (injector)
40 ... Air injection part

Claims (4)

An injector for injecting gas introduced into the interior;
A first housing that covers the injector and forms a guide for guiding the gas injected from the injector;
A sound-absorbing material disposed at a site for introducing the gas guided from the guide unit;
A second housing containing the sound absorbing material and having a discharge hole for discharging the introduced gas;
It provided a seal member for sealing the guide portion of at least the a member which injects gas in the injector first housing,
An injector silencer , wherein an introduction path for introducing the gas guided from the guide portion is formed in the sound absorbing material .   The silencer for an injector according to claim 1, wherein a buffer material is interposed between the injector and the first housing. 3. The injector silencer according to claim 1, wherein the seal member is a gel substance. The silencer for an injector according to claim 2, wherein the buffer material is a gel-like substance.

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