JP3915917B2 - air compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air compressor, and more particularly to an air compressor that can reduce the size of a blower or the like using an electromagnetic reciprocating compressor and reduce the pulsation of discharged air as much as possible without reducing the amount of air discharged.
[0002]
[Prior art]
This type of air compressor is known to compress air using an electromagnetic reciprocating compressor or the like as an example of a compression drive source and discharge the compressed air to the outside through a separate air tank. It has been.
In order to prevent the pulsation of the air discharged from the compressor from being transmitted to the outside, the present inventor has provided a buffer air tank for temporarily storing the compressed air discharged from the compressor separately from the compressor part, A compressor having a structure that suppresses air pulsation by discharging compressed air to a separate air tank through a nozzle provided at a discharge port has been proposed (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-45943
[Problems to be solved by the invention]
In Patent Document 1, since a separate air tank is provided and discharge air is temporarily accumulated in this air tank, it is possible to suppress air pulsation. In this case, however, the volume of the air tank is increased to some extent. Otherwise, the pulsation could not be suppressed.
Further, not only the number of parts constituting the air tank and the number of parts connecting the air tank and the compressor are increased, but the number of assembling steps is increased and the cost is increased.
[0005]
The present invention has been developed in view of the above-mentioned problems, and the object of the present invention is to provide an air tank integrally with the compressor body and efficiently suppress pulsation without reducing the amount of discharged air. An object of the present invention is to provide an air compressor that can reduce the number of parts constituting the air compressor, simplify the assembly work, and reduce the size.
[0006]
[Means for Solving the Problems]
To achieve the above object, the invention of claim 1, and a compression chamber for compressing air by reciprocation of the compression body, the compressor main body having a discharge chamber for discharging air from the compression chamber, the pulsation of discharged air An air tank part to be suppressed is integrally provided , and the discharge chamber and the air tank part are communicated with each other through a discharge hole. The air tank part is provided with an extension part integrally extending the discharge chamber and the extension part. The air compressor is configured to cover and form an internal volume .
[0008]
According to a second aspect of the present invention, there is provided a compressor body including a compression body integrally provided with a magnetic body or a permanent magnet, a fixed electromagnet provided around the magnetic body or the permanent magnet, and returning the compression body in one direction. The air compressor according to claim 1 or 2, which is an electromagnetic reciprocating compressor including return means.
[0009]
Therefore, when the air compressor is driven, air is compressed in the compression chamber by the reciprocating motion of the compression body, discharged from the compression chamber to the discharge chamber, and the compressed air expands. The expanded air is discharged to the integrated air tank, and the air in the air tank is discharged to the outside of the air compressor while being compressed at the discharge port, effectively suppressing pulsation without reducing the amount of air. be able to.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment applied to an electromagnetic reciprocating compressor as an example of an air compressor in the present invention will be described with reference to the drawings.
1 is a cross-sectional view of the electromagnetic reciprocating compressor, and is a cross-sectional view taken along line AA of FIG. 3 to be described later. FIG. 2 is a schematic explanatory view of FIG. In the figure, 1 is a compressor body, 2 is a casing of the compressor body 1, and this casing 2 includes a front casing 2a, a rear casing 2b, and a head cover 2c. In the casing 2, a cylinder 9 lined with a cylindrical liner 9 a is provided inside the compressed air discharge side, and a head 6 on the front side of a piston (compression body) 5 is slidable with respect to the cylinder 9. Is inserted. A suitable number of through holes 6a are provided in the head 6 in the circumferential direction, and a valve 13a that can be opened is provided on the head cover 2c side of the through hole 6a.
[0011]
The head cover 2 c is attached so as to cover the cylinder 9 side of the front casing 2 a, and two compression chambers 3 and 4 for compressing air by reciprocating movement of the piston 5 are formed inside the compressor body 1. The air that has passed through the through hole 6 a of the piston 5 enters the compression chambers 3 and 4 and is compressed by the piston 5 inside the cylinder 9. Reference numeral 10a denotes an annular seal member that seals the front casing 2a and the head cover 2c. Reference numeral 10b denotes an annular seal member that seals the tip of the cylinder 9 of the front casing 2a and the head cover 2c.
[0012]
A discharge chamber 11 is formed in the front casing 2 a and the head cover 2 c, a communication hole 12 is provided in the cylinder 9, and a valve 13 b that can be opened in the direction of the discharge chamber 11 is provided. The discharge chamber 11 communicates with the compression chambers 3 and 4 through the communication hole 12, and the air from the compression chambers 3 and 4 compressed by the reciprocating motion of the piston 5 is discharged into the discharge chamber 11.
Reference numeral 15 denotes an air tank portion that is configured to be provided integrally with the compressor body 1 and suppresses pulsation due to discharged air, and an appropriate number of the air tank portions 15 and discharge chambers 11 are provided at predetermined positions of the head cover 2c. It communicates through the discharge hole 14. Reference numeral 16 denotes a lid that covers the air tank portion 15. The air tank portion 15 includes an extension portion 8 in which the head cover 2 c is extended forward and the discharge chamber 11 is integrally formed, and the extension portion 8 has a lid 16. And the internal volume 15a is formed. An annular seal member 10c is provided between the front end surface of the extending portion 8 of the head cover 2c and the lid 16, so that leakage from the air tank portion 15 is eliminated. Reference numeral 26 denotes a discharge port that discharges air from the air tank 15 formed in the extended portion 8.
[0013]
On the other hand, a cylindrical portion 5a is formed integrally with the piston 5 on the rear side of the piston 5, and this cylindrical portion 5a is slidably fitted into a rear cylinder 18 lined with a liner 17. . Reference numeral 19 denotes a spring (return means). One end of the spring 19 is inserted inside the cylindrical portion 5a, and the other end is engaged with a washer 21 supported by the cylinder 18 via a ball 20 to give a spring. The entire piston 5 is urged toward the head 6. 22 is an armature (magnetic material or permanent magnet) formed integrally with the piston 5 in the vicinity of the middle of the piston 5. A field core 23 a is provided on the casing 2 side around the armature 22. The field core 23a is provided with a fixed electromagnet 23 in which a coil 23b is wound to form a magnetic pole. Between each of the coils 23b, there is provided a rectifier for flowing an alternating current (not shown) by half a wave. Each piston 5, 5 slides in a direction in which the head 6 pushes out the air in the cylinder 9 by the elastic force of the spring 19 when the fixed electromagnet 23 is demagnetized, while the armature 22 is pulled back when the fixed electromagnet 23 is excited. Thus, the entire piston 5 slides in the direction in which the spring 19 contracts, and the air in the casing 2 flows into the cylinder 9. Reference numeral 25 denotes a suction port provided in the casing 2, and external air flows into the casing 2 from the suction port 25 when the piston 5 slides in the direction of pushing out air.
[0014]
Next, the operation of the compressor body 1 will be described.
When the power of the compressor body 1 is turned on, the stationary electromagnets on either side of the compression chambers 3 or 4 are alternately excited, and the pistons 5 in the compression chambers 3 and 4 reciprocate while being shifted from each other by a half cycle. Air is obtained alternately from the compression chambers 3 and 4 by the operation of the piston 5, and air is continuously obtained when either one of the pistons 5 always pushes out air.
[0015]
When the fixed electromagnet 23 on the compression chamber 3 side is excited, a force acts in a direction in which the armature 22 is pulled back, and the piston 5 slides in a direction in which the spring 19 contracts. At this time, since the volume in the compression chamber 3 is expanded, the pressure in the chamber is reduced. When the pressure is reduced, the valve 13a is opened, and the air that has flowed into the casing 2 from the suction port 25 passes through the through hole 6a. Flows in.
[0016]
On the other hand, on the compression chamber 4 side, since the fixed electromagnet 23 is demagnetized, the piston 5 slides in the direction of pushing out the air in the compression chamber 3 by the elastic force of the spring 19, and at this time the valve 13a is closed. Since pressure in the valve direction is applied, the air in the compression chamber 4 opens the valve 13b, passes through the communication hole 12, and is discharged into the discharge chamber 11.
[0017]
Subsequently, when the fixed electromagnet 23 on the compression chamber 3 side is demagnetized and the fixed electromagnet 23 on the compression chamber 4 side is excited, the piston 5 on the compression chamber 3 side pushes out the air flowing into the compression chamber 3. And the air opens the valve 13b, passes through the communication hole 12, and is discharged into the discharge chamber 11, while the piston 5 on the compression chamber 4 side slides in the direction in which the spring 19 contracts, and the casing The air in 2 opens the valve 13 a and passes through the through hole 6 a and flows into the compression chamber 4. Thus, the air that has flowed into the compression chambers 3 and 4 is alternately discharged into the discharge chamber 11 by the reciprocating motion of the pistons 5 and 5.
[0018]
The air alternately pushed out from the compression chambers 3 and 4 by the piston 5 is discharged into each discharge chamber 11 through each communication hole 12 and expands. Next, the air that has entered each discharge chamber 11 passes through the discharge hole 14 provided in each discharge chamber 11 having a small diameter and is discharged to the air tank portion 15. The air that has flowed into the air tank portion 15 expands again. . The air in the air tank portion 15 passes through the discharge port 26 having a small diameter and is discharged out of the casing 2. The air compressed in the compression chambers 3 and 4 is expanded in the discharge chamber 11, compressed when passing through the discharge hole 14, expanded in the air tank portion 15, and compressed in the discharge port 26, and compressed / expanded. By repeating, the pulsation can be greatly suppressed, and even when the internal volume 15a is small, the pulsation at the time of air discharge can be efficiently suppressed. The air tank unit 15 is provided integrally with the casing (for example, aluminum die-cast) 2 and accumulates air in the integrated air tank unit 15 through the discharge holes 14. Without increasing the cost.
[0019]
In addition, if the air is alternately discharged by the plurality of compression chambers 3 and 4 as described above, the amount of air accumulated in the air tank unit 15 may be as much as the volume of one compression chamber. Even if the volume in the tank unit 15 is reduced to ½ or less of the conventional air tank volume, pulsation can be reliably suppressed without reducing the amount of air discharged. In the present embodiment, two compression chambers are provided, but one or three or more compression chambers may be provided. When there are three or more compression chambers, two compression chambers are provided. If the operation of the predetermined piston is shifted by half a cycle as in the case of the two, the volume of compressed air can be increased while reducing the volume of the air tank, and the piston can be reciprocated during the operation of the piston. Vibrations caused by movement can also cancel each other, and generation of vibrations can be suppressed.
[0020]
The air tank portion 15 is configured by extending the head cover 2c forward and integrally forming the discharge chamber 11, and by covering the extended portion 8 with a lid 16 to form an internal volume 15a. Therefore, a separate air tank can be eliminated by adopting a structure having the discharge chamber 11 by the head cover 2c.
[0021]
In addition, the compressor main body 1 is composed of a piston 5 integrally formed with an armature 22, a fixed electromagnet 23 provided around the armature 22, and a spring 19 that biases the piston 5 in one direction. Further, it can be made more compact by utilizing the structure of a conventional electromagnetic reciprocating compressor. In the present embodiment, the compression body is described as a piston, but the compression body may be a diaphragm.
[0022]
Next, the case where the above-described electromagnetic reciprocating compressor is provided in an air compressor (blower) will be described.
FIG. 3 is a longitudinal sectional view of an example applied to the air compressor in the present invention, and FIG. 4 is a sectional view in which a casing of the air compressor is sectioned and a part of the compressor is cut away.
In the blower 30, the compressor main body 1 is mounted in a casing 31 composed of an upper casing 31a and a lower casing 31b and fixed with screws 34. Further, the upper lid 33 is fixed with screws 35 with the filter 34 interposed in the upper casing 31a. It is configured to be fixed. The external air passes through the filter 34 and then flows into the casing 31 and flows into the main body through the suction port 25 of the compressor main body 1.
[0023]
Reference numeral 36 denotes a hose, and one end of the hose 36 is connected to the discharge port 26 of the compressor body 1. The hose 36 is supported by a support member 37 provided integrally with the lower casing 31b, and the other end of the hose 36 is connected to a nozzle 38 provided on the side wall of the lower casing 31b. Air from the compressor body 1 passes through the hose 36 from the discharge port 26 and is discharged from the nozzle 38 to the outside of the casing 31.
[0024]
Reference numeral 39 denotes a leg portion made of rubber, and the leg portion 39 is attached to the lower casing 31b so as to absorb vibration generated by the operation of the compressor body 1. Further, the compressor main body 1 is fixed at a predetermined position in the casing 31 at the upper portion of the leg portion 39.
[0025]
According to the blower 30, since the discharge port 26 of the compressor body 1 integrally provided with the air tank 15 and the nozzle 38 of the casing 31 can be connected only by the hose 36, the casing 31 can be made small and low. Further, since the air discharge flow path can be simply configured by the hose 36, the number of parts can be reduced and the assembling work is extremely easy.
[0026]
【The invention's effect】
From the above, according to the present invention, it is possible to efficiently suppress pulsation without reducing the amount of discharged air, the number of parts constituting the air compressor can be reduced, and the assembly work can be shortened. It is possible to reduce the size.
[0027]
Furthermore, since the compressor body is provided with an integral discharge chamber and an air tank, pulsation can be effectively suppressed without reducing the amount of air even if the tank volume is reduced to 1/2 or less.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an electromagnetic reciprocating compressor showing an example of the present invention, and is a cross-sectional view taken along line AA of FIG.
FIG. 2 is a schematic explanatory diagram of FIG. 1;
FIG. 3 is a longitudinal sectional view showing an example of an air compressor according to the present invention.
FIG. 4 is a cross-sectional view in which the casing of the air compressor in the present invention is sectioned and a part of the compressor is cut away.
[Explanation of symbols]
1 Compressor body 3, 4 Compression chamber 5 Piston (compressed body)
8 Extension part 11 Discharge chamber 14 Discharge hole 15 Air tank part 15a Internal volume 19 Spring (return means)
22 Amateur (magnetic or permanent magnet)
23 Fixed electromagnet

Claims (2)

A compression chamber for compressing air by reciprocation of the compression body, the compressor main body having a discharge chamber for discharging air from the compression chamber, provided with air tank to suppress the pulsation of discharge air together, the discharge chamber and the air tank The air tank portion is configured to form an internal volume by covering the extended portion with the extended portion integrally extending the discharge chamber. And air compressor. The compressor body includes a compression body integrally provided with a magnetic body or a permanent magnet, a fixed electromagnet provided around the magnetic body or the permanent magnet, and return means for returning the compression body in one direction. The air compressor according to claim 1, which is an electromagnetic reciprocating compressor.

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