JP4566676B2 - air compressor - Google Patents

Description

The present invention relates to an air compressor which discharges air by the power.

  A fluid machine is a machine that discharges fluid by power. For example, a reciprocating air compressor that is a type of a fluid machine includes a crankcase in which a crankshaft is rotatably provided, and a cylinder connected to the crankcase. A piston inserted in the cylinder so as to be able to reciprocate, a connecting rod provided between the piston and the crankshaft to reciprocate the piston by rotation of the crankshaft, a cylinder connected to the cylinder, and the piston And a cylinder head provided with a suction port for sucking air into the compression chamber, a suction valve for opening and closing the suction port, a discharge port for discharging air from the compression chamber, and a discharge valve for opening and closing the discharge port. I have.

In such a reciprocating type air compressor, noise generated when compressed air is discharged from the compression chamber may be a problem. This noise is generated when compressed air passes through the discharge port. is there. For this reason, there is one that aims to prevent noise by disposing a sound absorbing material in a discharge path that allows the discharge port and the air tank to communicate with each other (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 5-12675

  Although the sound absorbing material is arranged in the discharge passage as described above, although the effect of reducing the noise when the compressed air discharged from the discharge passage passes through the discharge passage and the resonance sound in the tank can be obtained, the discharge opening There was a problem that the noise itself generated when discharged from the nozzle cannot be reduced.

  By the way, the volume of the sound can be changed by changing the size of the discharge port. For example, when the discharge port is made larger, the sound becomes louder, and when the discharge port is made smaller, the sound becomes louder. However, if the discharge port is made smaller in order to reduce the sound, the flow rate of compressed air passing through the discharge port is increased, and a large impact is concentrated on the discharge valve that opens and closes the discharge port, shortening its life. There was a possibility.

Accordingly, the present invention is, compressed air can be reduced noise when passing through the discharge port, moreover the life of the discharge valve for the purpose of providing the air compressor which can prevent the shortened.

In order to achieve the above object, an invention according to claim 1 includes a piston that reciprocates in a cylinder, a suction valve that opens and closes a suction port formed in a cylinder head that closes one end of the cylinder, and the cylinder head. In the reciprocating air compressor having a discharge valve that opens and closes a discharge port formed in the valve, the discharge valve is made of a synthetic resin and has a circular sealing surface, and the valve is provided around the valve body. A spring for urging the body in the valve closing direction, the discharge port is formed of three or more circular holes, and the three or more holes are equally arranged around the center of the seal surface. It is a feature.

According to the invention of claim 1, since the discharge port is composed of a plurality of holes, even by reducing the respective holes for compressed air to reduce the noise generated when passing through each hole, there are multiple holes it is possible to suppress the flow rate of the compressed air passing through each hole by, as a result, it is possible to reduce the impact on the discharge valve compressed air to open and close the discharge port. Moreover compressed air can be dispersed impact on the discharge valve by dividing a plurality of holes. Accordingly, compressed air can be reduced noise when passing through the discharge ports, yet can prevent the life of the discharge valve is shortened.

Moreover, by making the discharge port into three or more holes, for example, when the discharge valve has a circular seal surface, each hole can be arranged with a good area balance with respect to this seal surface. . Thus, even the discharge valve will receive a balanced impact as if compressed air having passed through the respective holes shocked the discharge valve, it is possible to further prolong the service life as compared with the case shocked biased .
Further, the discharge valve has a circular sealing surface, and the three or more holes are arranged uniformly in the circumferential direction in the sealing surface, so that each of the circular sealing surfaces The holes can be arranged in a well-balanced area. Thus, even the discharge valve will receive a balanced impact as if compressed air having passed through the respective holes shocked the discharge valve, it is possible to further prolong the service life as compared with the case shocked biased .

An air compressor according to an embodiment of the present invention will be described below with reference to the drawings.
The air compressor 20 of the present embodiment is used in an air suspension system mounted on a vehicle such as an automobile, for example, and supplies compressed air to the air suspension. A motor case 21 and a crankcase 22 are connected to each other below the air compressor 20. The motor 24 is housed in the motor case 21 so that the output shaft 23 protrudes toward the crankcase 22.

  The output shaft 23 of the motor 24 is rotatably supported by the crankcase 22 at an intermediate portion via a bearing 26, and a crank member 27 extending in the direction perpendicular to the axis is projected at a tip portion protruding into the crankcase 22. Is fixed. A crank pin 28 is supported on the crank member 27 in parallel with the output shaft 23 of the motor 24. Thereby, when the output shaft 23 of the motor 24 rotates, the crank pin 28 turns around the output shaft 23 via the crank member 27. As a result, the output shaft 23, the crank member 27, and the crank pin 28 constitute a crankshaft 29, and the crankshaft 29 is rotatably provided on the crankcase 22.

  A cylinder 31 is connected to the crankcase 22 in a state of being mounted on the upper side, and a piston 32 is inserted inside the cylinder 31 so as to be able to reciprocate. One end side of a connecting rod 34 is rotatably connected to the piston 32 via a piston pin 33, and the other end side of the connecting rod 34 is rotatable to a crank pin 28 of a crankshaft 29 via a bearing 35. It is connected. As a result, when the crank pin 28 turns by the rotation of the motor 24, the piston 32 reciprocates in the cylinder 31 via the connecting rod 34. That is, the connecting rod 34 provided between the piston 32 and the crankshaft 29 reciprocates the piston 32 by the rotation of the crankshaft 29.

  A cylinder head 37 is connected to the cylinder 31 with the cylinder head 37 mounted on the upper side, and the cylinder head 37 defines a compression chamber 38 by the cylinder 31 and the piston 32. The cylinder head 37 has an intake passage 42, one end side of which is an outside air intake port 40 facing the outside of the machine, the other end side is opened to the compression chamber 38, and an intake port 41 for sucking air into the compression chamber 38. The discharge port 46 is formed as a connection port 44 connected to an air dryer 43 that removes moisture from the other end, and the other end side opens into the compression chamber 38 and serves as a discharge port 45 that discharges air from the compression chamber 38. .

  The suction passage 42 is provided with a suction valve 48 that opens and closes the suction port 41, and the suction valve 48 opens and closes only to allow air flow from the outside air intake 40 side to the suction port 41 side. The suction valve 48 includes a valve body 49 that opens and closes the suction port 41 and a spring 50 that urges the valve body 49 in a direction to close the suction port 41, and the pressure in the compression chamber 38 is greater than the external pressure. When it becomes lower than the urging force of the spring 50, the valve body 49 moves to open the suction port 41.

  The discharge passage 46 is provided with a discharge valve 52 that opens and closes the discharge port 45. The discharge valve 52 opens and closes only to allow air flow from the discharge port 45 side to the connection port 44 side. The discharge valve 52 includes a synthetic resin valve body 53 that opens and closes the discharge port 45 and a spring 54 that urges the valve body 53 in a direction to close the discharge port 45. Becomes higher than the pressure on the connection port 44 side beyond the biasing force of the spring 54, the valve body 53 moves to open the discharge port 45.

  The air dryer 43 includes a dryer case 58 having a vent 56 connected to the connection port 44 and a vent 57 connected to a compressed air supply destination. The dryer case 58 has a vent on the vent 56 side. A partition plate 60 having a permeable property is fitted with a partition plate 61 having a breathability on the side of the vent 57, and a spherical shape is formed in the suction chamber 62 defined by the partition plate 60 and the partition plate 61. A large number of silica gels (water adsorbents) 63 are packed. In addition, a spring 64 that presses the partition plate 61 in the direction of the partition plate 60 is interposed between the partition plate 61 and the dryer case 58. When the partition plate 61 is pressed, the partition plate 60 and the partition case 58 are partitioned. The inside of the adsorption chamber 62 between the plate 61 is in a state where the silica gel 63 is closely packed.

  In the present embodiment, as shown in FIGS. 2 and 3, the discharge port 45 of the discharge passage 46 includes a plurality of, specifically, seven holes 67 having the same diameter. Here, the valve body 53 that opens and closes these holes 67 at a time is in contact with a flat valve seat surface 68 that opens on the opposite side of the hole 67 from the compression chamber 38, and the sealing surface 70 that closes these holes 67 is flat. The plurality of holes 67 are formed so as to be evenly arranged in the circumferential direction with respect to the seal surface 70 in contact with the valve seat surface 68.

  Specifically, one hole 67 is provided at the center position of the seal surface 70, and the remaining six holes 67 are all at the same radial position with respect to the center of the seal surface 70 and the circumference is equally spaced by 60 degrees. It is provided every other. In this way, since the seven holes 67 are evenly arranged with the center of the seal surface 70 as the center, each hole 67 is divided into the hole 67 portion and the portion without the hole 67 with respect to the seal surface 70 in terms of area. There is no bias. In addition, in order to arrange in a balanced manner so that there is no deviation in area between the portion of the hole 67 and the portion without the hole 67 with respect to the seal surface 70 as described above, the number of the holes 67 should be three or more. preferable.

When the motor 24 of the air compressor 20 having such a configuration is started, the output shaft 23 of the motor 24 rotates, and the crank pin 28 turns via the crank member 27. Then, the piston 32 reciprocates in the cylinder 31 via the connecting rod 34 to increase or decrease the volume of the compression chamber 38. When the volume of the compression chamber 38 is increased, the suction valve 48 is opened to open the suction passage 42. When the outside air is introduced into the compression chamber 38 through the air and the volume of the compression chamber 38 is reduced, the air is compressed, and the discharge valve 52 is opened by the pressure to open the discharge valve 45 from the plurality of holes 67 through the discharge passage 46. Compressed air is discharged.

  Here, the diameter of each hole 67 is reduced, and as a result, the noise when compressed air passes through each hole 67 is reduced and the silence is excellent. Moreover, even if each hole 67 is made small in this way, the flow rate of the compressed air passing through each hole 67 can be suppressed due to the plurality of holes 67. As a result, the compressed air opens and closes each hole 67. The impact given to the synthetic resin valve body 53 of the discharge valve 52 can be reduced. Moreover, the impact that the compressed air gives to the valve body 53 can be dispersed by dividing it into the plurality of holes 67. Therefore, noise when compressed air passes through the discharge port 45 can be reduced, and the life of the valve body 49 of the discharge valve 52 can be prevented from being shortened.

  The compressed air discharged as described above is introduced from the vent 56 into the dryer case 58 of the air dryer 43, passes through the partition plate 60, passes through the adsorption chamber 62, and in that case, the silica gel 63 in the adsorption chamber 62 receives moisture. Is removed by being adsorbed, and then discharged from the vent 57 through the partition plate 61.

  Here, when the discharge port 45 has a plurality of holes 67, as described above, the discharge valve 52 has the circular seal surface 70 by having three or more holes 67. The holes 67 can be arranged with a good area balance with respect to the seal surface 70. Therefore, even if the compressed air that has passed through each hole 67 gives an impact to the discharge valve 52, the discharge valve 52 receives an impact in a well-balanced manner, and further extends the life compared to the case where the impact is applied unevenly. Can do.

It is also possible to form a plurality of holes 67 constituting the discharge port 45 in a separate sintered part during sintering and attach the sintered part to the mounting hole of the cylinder head 37. In this way, the plurality of holes 67 can be easily formed .

It is sectional drawing which shows the air compressor of one Embodiment of this invention. It is a partial expanded sectional view which shows the principal part of the air compressor of one Embodiment of this invention. It is a top view which shows the discharge outlet of the air compressor of one Embodiment of this invention.

Explanation of symbols

20 Air compressor 45 Discharge port 52 Discharge valve 67 Hole 70 Seal surface

Claims (1)

Reciprocating motion having a piston that reciprocates in a cylinder, a suction valve that opens and closes a suction port formed in a cylinder head that closes one end of the cylinder, and a discharge valve that opens and closes a discharge port formed in the cylinder head Type air compressor,
The discharge valve is made of a synthetic resin valve body having a circular seal surface and a spring provided around the valve body to urge the valve body in a valve closing direction, and the discharge port has three or more discharge ports. An air compressor comprising circular holes, wherein the three or more holes are evenly arranged around the center of the sealing surface.

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