JP2006057549A - Gas engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas engine for suppressing the generation of abnormal noises with fuel passing through a fuel control chamber. <P>SOLUTION: Body cases 202, 207 of a gas regulator 200 are separated into two chambers with a diaphragms 201, one being the fuel control chamber and the other being an atmosphere balancing chamber. Pipe members 21, 22, 31, 32 are communicated with an atmosphere opening hole 205 communicated with the atmosphere balancing chamber, and noise eliminating means 20, 30 are provided in the pipe members 21, 22, 31, 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an engine regulator technique, and more particularly to a gas engine technique for supplying fuel gas to a mixer via a gas regulator.

  Conventionally, in the gas regulator 200, as shown in FIGS. 4 to 6, the inside of the regulator case is vertically divided by a diaphragm 201, and the diaphragm 201 is urged from above and below by a balance spring 204 and a spring 209. . The inside of the upper case is communicated with the atmosphere via the atmosphere opening hole 205, and the lower case is communicated with the venturi 9 through the piping from the fuel gas outlet 106, while the fuel gas pipe 7 is supplied with fuel. A gas regulating valve 210 is provided at the inner end of the lower case of the fuel gas pipe 7. The gas regulating valve 210 is connected to one end of the lever 213, and the other end of the lever 213 is locked to the spring 209. Was configured to do.

Then, in the gas regulator 200 during operation of the gas engine 1, the diaphragm 201 receives the negative pressure from the venturi 9 by the start operation of the gas engine 1 and descends while being balanced with the atmospheric pressure. The gas is supplied to the engine (cylinder 3) side by opening the gas control valve 210 by the interlocked lever 213.
More specifically, when the negative pressure from the venturi 9 is smaller than a certain value by the flow rate adjusting screw 203, the balance spring 204, and the spring 209, the diaphragm 201 does not descend in balance with the atmospheric pressure or the balance spring 204, so that the lever 213 When the gas control valve 210 does not open and the negative pressure from the venturi 9 is larger than a certain value determined by adjustment of the flow rate adjusting screw 203 or the like, the diaphragm 201 receives the negative pressure from the engine and becomes atmospheric pressure. The lever 213 was rotated in the clockwise direction in FIG. 6, the gas regulating valve 210 was opened, and the fuel gas was sucked in the direction of the engine (cylinder 3) through the lower part of the gas regulator 200.

The gas regulator 200 has a function of reducing the fuel gas (city gas, propane gas, etc.) supplied to the lower part of the gas regulator 200 at a pressure of 150 to 350 mmAq to a pressure substantially equal to the atmospheric pressure. However, in order to balance the pressure of the fuel gas with the atmospheric pressure via the diaphragm 201, an air opening hole 205 is provided in the upper part of the main body.
In a gas engine using such a fuel gas, a balance line is often interposed between the intake pipe and the gas regulator 200 in order to make the air-fuel efficiency constant. In this case, the intake air pulsates, There was a problem that control did not converge.
In order to solve such a problem, in other words, a surge tank or a throttle mechanism is interposed in between so that the pulsation of the intake air is not transmitted to the diaphragm 201 via the balance line, and the intake pipe reaching the surge tank A technique for changing the diameters of the side connecting pipe and the gas regulator side connecting pipe is also known (for example, see Patent Document 1).
Japanese Patent No. 2873104

  However, in the gas engine, a flow rate sound that passes through the gas passage is generated in a certain fuel gas flow rate region, and in the conventional gas engine, this sound is released from the atmosphere opening hole 205 to the outside of the gas regulator 200 or the package. It was heard as noise (flute) by the people around me.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1, in a gas engine that supplies fuel gas to a mixer via a gas regulator,
The inside of the gas regulator body case is separated into two rooms with a diaphragm,
One is the fuel control chamber, the other is the air balance chamber,
A pipe member is communicated with an atmosphere opening hole communicating with the atmospheric balance chamber, and a silencer is provided on the pipe member.

  According to a second aspect of the present invention, the silencer is configured by an orifice provided in the pipe member.

  According to a third aspect of the present invention, the silencer comprises an expansion hole that is opened in the middle of the pipe member, and a case that encloses a sound absorbing material disposed on the outer periphery of the expansion hole.

In Claim 4, in the gas engine which supplies fuel gas to a mixer via a gas regulator,
The inside of the gas regulator body case is separated into two rooms with a diaphragm,
One is the fuel control chamber, the other is the air balance chamber,
A pipe member is communicated with an atmosphere opening hole communicating with the atmosphere balance chamber;
Sound absorbing means is disposed in the vicinity of the outlet of the pipe member.

  According to a fifth aspect of the present invention, the sound absorbing means has a sound absorbing member disposed opposite the outlet of the pipe member.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, it is possible to suppress abnormal noise that occurs when fuel passes through the fuel adjustment chamber. In addition, the volume of abnormal noise can be reduced while maintaining the performance of the regulator. In addition, the arrangement position of the silencer is not limited and does not interfere with other members.

  In Claim 2, generation | occurrence | production of abnormal noise can be suppressed with a simple structure. In addition, assembly is easy and inexpensive.

  According to the third aspect, it is possible to greatly reduce abnormal noise generated with the air passing through the pipe member. Further, the muffling means can be retrofitted as a muffler, can be easily attached and detached, and can be easily maintained.

  According to the fourth aspect of the present invention, it is possible to suppress abnormal noise that occurs when fuel passes through the fuel adjustment chamber. In addition, the volume of abnormal noise can be reduced while maintaining the performance of the regulator. In addition, there is no need to change or modify the gas regulator itself to reduce abnormal noise.

  According to the fifth aspect of the present invention, the sound absorbing member can be arranged in accordance with the frequency, amplitude, etc. of abnormal noise, and the sound absorbing effect can be enhanced. In addition, the structure of the sound absorbing means can be simplified and can be improved at low cost.

Next, embodiments of the invention will be described.
1 is a partially sectional front view showing a first embodiment of the silencer 20 of the present invention, FIG. 2 is a partially sectional front view showing a second embodiment of the silencer 30, and FIG. FIG. 4 is a front sectional view showing one embodiment of the gas engine 1, FIG. 5 is an enlarged front sectional view of the gas mixer 5, and FIG. 6 is a front sectional view showing the gas regulator 200. FIG.

First, the whole structure of the gas engine 1 of this invention is demonstrated using FIG.
An intake manifold 2, an exhaust manifold 16, an intake valve 17, an exhaust valve 18, a spark plug 19, and the like are provided on a cylinder head 4 disposed at the upper part of the cylinder 3 of the gas engine 1. A gas mixer 5 is connected to the other end of the intake manifold 2. The gas mixer 5 includes a venturi 9 and a throttle valve 10, and the venturi 9 is provided with an intake port 5a and a fuel intake port 5b. The intake port 5a An air cleaner 8 is connected to. A fuel adjusting device 6 is connected to the fuel inlet 5 b, and the other end of the fuel adjusting device 6 is connected to a fuel gas outlet 206 of the gas regulator 200. The gas mixer 5 is provided with a fuel adjusting device 6, and the fuel adjusting device 6 is provided with an adjusting screw (MAS) 11 and a fuel control valve 12 which will be described later.

The gas mixer 5 is configured such that the fuel gas whose flow rate is adjusted by the fuel adjusting device 6 and the air sucked through the air cleaner 8 are mixed and the mixed gas is sent to the intake manifold 2. Yes.
The venturi 9 provided in the gas mixer 5 increases the flow velocity of the intake air by narrowing the intake passage, and allows the fuel to be supplied by setting the fuel intake port 5b side to a negative pressure.
Further, a throttle valve 10 is provided between the venturi 9 in the gas mixer 5 and the intake manifold 2, and the fuel gas flowing into the intake manifold 2 is changed by rotating the throttle valve 10 to change the flow passage area. The flow rate is adjusted.

Next, the structure of the gas mixer 5 will be described in more detail with reference to FIG.
The gas mixer 5 sucks out the fuel gas from the gas regulator 200 through the fuel adjusting device by the negative pressure generated in the venturi 9 by the operation of the engine. Then, as described above, the amount of intake air to the intake manifold 2 and the fuel are adjusted by the throttle valve 10 to control the operating state (rotation speed) of the gas engine 1 (cylinder 3). Here, the throttle valve 10 is driven by a step motor (stepping motor) capable of controlling the inclination of the valve or the like in the present embodiment, but can be arbitrarily changed in connection with an accelerator lever.
The fuel adjusting device 6 joins the fuel hose 6a communicated with the fuel inlet 5b, the main passage 6b branched from the fuel hose 6a and the bypass passage 6c, and the main passage 6b and the bypass passage 6c. A supply passage 6d communicated with the fuel gas outlet 206, an adjustment screw (MAS: main adjustment screw) 11 provided in the middle of the main passage 6b, and a fuel control valve 12 provided in the middle of the bypass passage 6c.

The adjusting screw 11 is for adjusting the amount of fuel passing through the main passage 6b before shipping, that is, at the time of manufacture, and cannot be adjusted in the market. The fuel control valve 12 adjusts the flow rate of the bypass passage 6c. When the gas engine 1 is started, the passage amount (fuel gas amount) is increased to make it easier to start or when the gas engine 1 itself deteriorates over time. Accordingly, the flow rate of the fuel is finely adjusted when the flow in the hose becomes worse or the negative pressure is lowered due to clogging of the air cleaner 8 or the like. The fuel control valve 12 is driven by a step-up motor or the like connected to the control means to automatically adjust the flow rate, but is not limited as long as it can control the opening and closing of the valve.
Thus, the fuel gas discharged from the fuel gas outlet 206 of the gas regulator 200 mainly flows through the main passage 6b, and also flows into the bypass passage 6c at the time of start-up, etc., joins at the fuel hose 6a, and mixes with air at the venturi 9. Is done.

Next, the aforementioned gas regulator 200 will be described with reference to FIG.
The gas regulator 200 sucks fuel gas from the fuel gas pipe 7 connected to the fuel gas inlet 215. More specifically, the fuel gas control valve 210 opens and closes when the diaphragm 201 moves up and down by the negative pressure generated in the venturi 9 by the operation of the engine, and supplies the fuel gas from the fuel gas pipe 7 to the fuel control device 6. It has a configuration.

Therefore, when the engine is stopped, no negative pressure is generated in the venturi 9, the diaphragm 201 closes the fuel gas control valve 210, and no fuel gas flows from the fuel gas pipe 7, but when the engine is activated, When the intake valve 17 opens and the intake valve 17 opens, air flows from the air cleaner 8 to the intake manifold 2, and the flow velocity of the main passage increases in the venturi 9, thereby generating a negative pressure at the fuel intake port 5 b. The pressure inside the chamber 201 below the diaphragm 201 of the gas regulator 200 is lowered via the valve, and the diaphragm 201 descends to balance the negative pressure.
Then, the spring 209 is contracted in conjunction with the diaphragm 201, the lever 213 is rotated in the clockwise direction, the fuel gas control valve 210 is separated from the fuel gas inlet 215, and the fuel gas is fed from the fuel gas pipe 7 to the lower part of the gas regulator 200. Will flow in. The fuel gas flowing into the lower part of the gas regulator 200 receives the negative pressure from the venturi 9 and is sucked in the direction of the gas mixer 5 from the fuel gas outlet 206.

Next, the configuration of the silencer 20 of the gas engine 1 of the present invention will be described with reference to FIG.
As shown in FIG. 1, the gas regulator 200 provides an upper and lower space inside by aligning the dish-shaped upper regulator cover 202 and the lower regulator case 207 with the concave portions facing each other via the diaphragm 101. It is configured in a different shape.
Specifically, the upper regulator cover 202 has a flange portion 202b formed around the lower portion, and the lower regulator case 207 also has a flange portion 207b formed around the upper portion. The flange portions 202b and 207b are fixed to each other by bolts 208, 208, etc. (welding, caulking, etc. are possible) to form a hollow gas regulator 200 covered by the regulator cover 202 and the regulator case 207. -ing

The gas regulator 200 is provided with a diaphragm 201 (see FIG. 6) that is horizontally stretched in the center in the up-down direction, and is configured so that air above and below the diaphragm 201 cannot pass back and forth. The upper space is an air balance chamber, and the space below the diaphragm 201 is a fuel control chamber, which is separated into two upper and lower spaces. The diaphragm 201 is made of an elastic film such as a metal or a synthetic resin and can be expanded and contracted, and is fixed between the regulator cover 202 and the regulator case 207.
As shown in FIG. 1, the regulator cover 202 has an air release hole 205 formed on the upper surface or a side slope, and an air release pipe 22 serving as a pipe member is fixed to the air release hole 205. Yes. An atmospheric hose 21 serving as a pipe member is further connected to the atmospheric release pipe 22, and the atmosphere outside the gas engine 1 is connected to the gas regulator via the atmospheric release hole 205, the atmospheric release pipe 22, and the atmospheric hose 21. The air is allowed to enter the space above the 200 or to the outside from the space above the gas regulator 200.
In this way, the air inside the gas regulator 200 above the diaphragm 201 is maintained at the same pressure as the atmosphere outside the gas engine 1.

On the other hand, the regulator case 207 has a fuel gas outlet 206 formed on a side slope, and the fuel adjusting device 6 connected to the fuel gas outlet 206 is connected to the regulator case 207.
A fuel gas inlet 215 is formed in the regulator case 207 on the side or lower side opposite to the fuel gas outlet 206. The fuel gas pipe 7 is connected to the fuel gas inlet 215, and the fuel gas flows from the fuel tank or the like through the fuel gas pipe 7 and the fuel gas inlet 215 into the space below the gas regulator 200. It is configured as follows. The inflowing fuel gas flows from the fuel gas outlet 206 to the gas mixer 5 through the fuel adjusting device 6 due to the negative pressure generated in the venturi 9.

  As shown in FIG. 1, an orifice 23 is provided in the atmospheric hose 21 at the tip of the atmospheric release pipe 22 on the atmospheric hose 21 side, and the air in the gas regulator 200 is outside the gas engine 1. When exiting, the orifice 23 must pass through a small-diameter hole 23b. The connection method of the atmosphere release pipe 22 and the atmosphere hose 21 is not limited to the configuration in which the end of the atmosphere hose 21 covers the entire orifice 23 and the end of the atmosphere release pipe 22 as shown in FIG. The arrangement position of the orifice 23 may be in the middle of the atmosphere opening hole 205 and a passage (hose) connected to the atmosphere opening hole 205 and disposed outside.

When the flow rate of the fuel gas passing through the space below the gas regulator 200 is within a certain flow rate range, the fuel gas passing through the fuel gas pipe 7 and the diaphragm 201 resonates, or the fuel gas pipe 7 and the diaphragm 201 vibrate. In some cases, the atmosphere flowing out from the gas regulator 200 vibrates violently and generates noise. The noise reduction means 20 for reducing this noise causes such flowing vibration to pass through the orifice 23. It is configured to attenuate.
That is, the orifice 23 is disposed in the pipe member, specifically, fixed to the tip of the atmosphere release pipe 22 or fixed to the end of the atmosphere hose 21 on the gas regulator 200 side, By passing the air flowing out from the upper part of the gas regulator 200 through the small-diameter hole 23b of the orifice 23, the passing air is greatly expanded and noise (abnormal noise) can be reduced. Further, by appropriately adjusting the distance between the atmosphere opening hole 205 and the orifice 23 or the distance between the orifice 23 and the tip of the atmosphere hose 21 on the opening side, it is possible to attenuate air pressure fluctuations in a specific frequency range. Further, the orifice 23 may be disposed at an end portion inside the atmosphere release pipe 22.

Thus, in the gas engine 1 that supplies the fuel gas to the mixer 5 via the gas regulator 200,
The main body cases 202 and 207 of the gas regulator 200 are separated into two rooms by a diaphragm 201,
One is the fuel control chamber, the other is the air balance chamber,
Since the pipe members 21, 22, 31 and 32 are communicated with the atmosphere opening hole 205 which communicates with the atmospheric balance chamber, and the orifices 23 which serve as the silencing means 20 and 30 are provided in the pipe members 21, 22, 31 and 32,
Abnormal noise generated in the gas regulator 200 when the fuel passes through the fuel control chamber can be suppressed. Moreover, the volume of abnormal noise can be reduced while maintaining the performance of the gas regulator 200. In addition, since the silencer means 20 and 30 can be arranged in the pipe member, the arrangement position thereof is not limited, and the silencer means 20 and 30 do not interfere with other members.

Further, since the muffling means 20 is constituted by the orifice 23 provided in the pipe members 21 and 22,
Generation of abnormal noise can be suppressed with a simple configuration. In addition, assembly is easy and inexpensive.

Next, a second embodiment of the silencer 30 will be described with reference to FIG.
As described above, the atmosphere opening hole 205 is formed in the upper part of the gas regulator 200, and the atmosphere opening pipe 32 is fixed to the atmosphere opening hole 205. The atmosphere release pipe 32 is connected to the atmosphere pipe 31 whose end opposite to the gas regulator 200 is a pipe member.
As shown in FIG. 2, the connection method of the atmosphere release pipe 32 and the atmosphere pipe 31 is configured such that the end of the atmosphere pipe 31 and the end of the atmosphere release pipe 32 are brought into contact with each other and both ends are covered with the rubber hose 35. It has become. Here, the connection method is not limited to the configuration in which the end portion of the atmospheric pipe 31 and the end portion of the atmospheric release pipe 32 are brought into contact with each other and covered with the rubber hose 35. The connection between the atmospheric release pipe 32 and the atmospheric pipe 31 is not limited. Any structure that does not allow a large amount of air to leak from the section may be used.

In the atmosphere pipe 31, a plurality of expansion holes 31b, 31b,... Are opened on the side of the pipe, and the atmosphere passing through the atmosphere pipe 31 may escape from the expansion holes 31b, 31b,. It can be configured. A sound absorbing material 33 is disposed on the outer periphery of the atmospheric pipe 31 over a range where the expansion holes 31b, 31b,... Are formed.
The silencer 30 may be configured such that the sound absorbing material 33 is directly attached to the outer periphery of the atmospheric pipe 31, but as shown in FIG. 2, a certain gap is provided on the outer periphery of the atmospheric pipe 31. A cylindrical member 34 having a larger diameter than 31 may be fixed, and the sound absorbing material 33 may be enclosed in a gap between the cylindrical member 34 and the outer periphery of the atmospheric pipe 31. Further, the silencer 30 may be configured to change the diameter of the expansion hole 31b and arrange a plurality of locations to further enhance the silence effect.

As described above, the silencer 30 includes the expansion holes 31b, 31b,... Opened in the middle of the pipe member 31, and the sound absorbing material 33 disposed on the outer periphery of the expansion holes 31b, 31b,. Because it was configured with
Abnormal noise generated with the air passing through the pipe member 31 can be greatly reduced. Further, the muffler 30 can be retrofitted as a muffler, can be easily attached even after sale, and can easily cope with changes in specifications. Further, it can be easily attached and detached, and maintenance such as replacement and repair can be easily performed.

Next, a third embodiment of the sound absorbing means 40 will be described with reference to FIG.
As described above, the atmosphere opening hole 205 is formed in the upper part of the gas regulator 200, and the atmosphere opening pipe 42 is fixed to the atmosphere opening hole 205. The air release pipe 42 is connected to the air pipe 41 at the end opposite to the gas regulator 200.
As shown in FIG. 3, the connection method of the atmosphere release pipe 42 and the atmosphere pipe 41 is configured to cover the end of the atmosphere release pipe 42 with the end of the atmosphere pipe 41. However, the present invention is not limited to this, and any structure may be used as long as a large amount of air does not leak from the connecting portion between the air release pipe 42 and the air pipe 41.

  A sound absorbing material 43 is disposed in the vicinity of the end of the atmospheric pipe 41 opposite to the atmospheric release pipe 42. That is, the sound-absorbing material 43 is located on the opposite side of the atmospheric pipe 41 from the atmospheric opening pipe 42 at a distance from the end of the atmospheric pipe 41 (a predetermined interval at which air can be supplied and discharged from the atmospheric pipe 41). It arrange | positions so that a part may be opposed. The sound absorbing material 43 (33) is made of sponge, foamed resin or the like. Thus, when the air in the space above the gas regulator 200 (atmosphere balance chamber) is discharged to the outside of the gas engine 1 through the atmosphere pipe 41, the air with the abnormal noise hits the sound absorbing material 43. It is configured to be discharged after.

Therefore, when the flow rate of the fuel gas passing through the space below the gas regulator 200 is within a certain flow rate range, the fuel gas passing through the fuel passage such as the fuel gas pipe 7 or the supply passage 6d resonates, or the fuel The gas pipe 7 and the diaphragm 201 may vibrate and the atmosphere flowing out from the gas regulator 200 may vibrate vigorously and generate abnormal noise. However, the sound absorbing means 40 causes the air flowing out from the gas regulator 200 by the atmospheric pipe 41 to The sound absorbing material 43 is guided so as to collide with it, and the structure is configured to attenuate the intense vibration of air.
That is, the air flowing out from the upper portion of the gas regulator 200 is collided with the elastic sound absorbing material 43, whereby the air pressure fluctuation is absorbed by the sound absorbing material 43 and attenuated to reduce the abnormal noise.

Thus, in the gas engine 1 that supplies the fuel gas to the mixer 5 via the gas regulator 200,
The main body cases 202 and 207 of the gas regulator 200 are separated into two rooms by a diaphragm 201,
One is the fuel control chamber, the other is the air balance chamber,
The pipe members 41 and 42 are communicated with the atmosphere opening hole 205 communicating with the atmosphere balance chamber,
Since the sound absorbing means 43 is disposed in the vicinity of the outlet of the pipe members 41 and 42,
Abnormal noise generated in the gas regulator 200 when the fuel passes through the fuel control chamber can be suppressed. Moreover, the volume of abnormal noise can be reduced while maintaining the performance of the gas regulator 200. In addition, it is not necessary to change or modify the gas regulator 200 itself to reduce abnormal noise.

Further, since the sound absorbing means 40 is arranged with the sound absorbing member 43 facing the outlets of the pipe members 41 and 42,
The sound absorbing member 43 can be arranged according to the frequency, amplitude, etc. of the abnormal sound, and the sound absorbing effect can be enhanced. In addition, the structure of the sound absorbing means 40 can be simplified and can be improved at low cost.

The partial cross section front view which shows the 1st Example of the silencer 20 of this invention. The partial cross section front view which shows the 2nd Example of the silencer 30. FIG. The partial cross-sectional front view which shows the 3rd Example of the sound-absorbing means 40. FIG. 1 is a front sectional view showing an embodiment of a gas engine 1 of the present invention. FIG. 3 is an enlarged front sectional view of the gas mixer 5. FIG. 2 is a front sectional view showing a gas regulator 200.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas engine 3 Cylinder 5 Gas mixer 20 Silencing means 21 Atmospheric hose 22 Atmospheric release pipe 23 Orifice 30 Silencing means 31 Atmospheric pipe 32 Atmospheric release pipe 33 Sound absorbing material 34 Cylindrical member (case)
40 Sound Absorbing Means 41 Atmospheric Release Pipe 42 Atmospheric Release Pipe 43 Sound Absorbing Material 200 Gas Regulator 201 Diaphragm 205 Atmospheric Open Hole 206 Fuel Gas Outlet 213 Lever 215 Fuel Gas Inlet

Claims (5)

In a gas engine that supplies fuel gas to a mixer via a gas regulator,
The inside of the gas regulator body case is separated into two rooms with a diaphragm,
One is the fuel control chamber, the other is the air balance chamber,
A pipe member is communicated with the atmosphere opening hole communicating with the atmospheric balance chamber, and a silencer is provided on the pipe member.
A gas engine characterized by that. The silencing means is composed of an orifice provided in the pipe member,
The gas engine according to claim 1. The silencer comprises an expansion hole opened in the middle of the pipe member, and a case enclosing a sound absorbing material arranged on the outer periphery of the expansion hole.
The gas engine according to claim 1. In a gas engine that supplies fuel gas to a mixer via a gas regulator,
The inside of the gas regulator body case is separated into two rooms with a diaphragm,
One is the fuel control chamber, the other is the air balance chamber,
A pipe member is communicated with an atmosphere opening hole communicating with the atmosphere balance chamber;
A sound absorbing means is disposed in the vicinity of the outlet of the pipe member.
A gas engine characterized by that. The sound absorbing means is arranged such that the sound absorbing member faces the outlet of the pipe member.
The gas engine according to claim 4.

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