JPH109144A - Compressor air tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the rusting of a compressor air tank and thus smoothly discharge drain water by bending a silencer pipe projected into the air tank to direct the discharge from the tip discharge port thereof substantially horizontally as well as away from the wall surface of the air tank near the arranged position thereof. SOLUTION: A silencer pipe 5 is bent to have an angle which permits its easy insertion through the hole of a socket 1a welded to an air tank 1 and causes no excessive restriction as to affect its silencer effect or discharge resistance. The discharge port of the bent silencer pipe 5 is directed horizontally away from the wall surface of the air tank to the utmost, because the discharge from near the wall surface of a mirror part thereto is more liable to produce pinholes due to rusting and noises like in the case of the discharge from a straight pipe to the bottom of the air tank. The horizontal discharge causes no agitation in the liquid surface in the vicinity of the suction opening of a drain pipe 2 for sucking drain water up, to permit the complete discharge of drain water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencing pipe for introducing compressed air, which is protruded into an air tank of a compressor.
The discharge flow affects the prevention of drain water accumulated and stored in the air tank and the promotion of rusting in the air tank.

[0002]

2. Description of the Related Art A gas compressor such as a reciprocating compressor or a rotary compressor, which compresses air by sucking the atmosphere, usually stores compressed air in an air tank once, absorbs discharge pulsation, and frequently discharges air. It plays a role of avoiding operation on and off, cooling air, and removing moisture in compressed air. Then, for storing in the air tank, the compressor is connected to a socket welded to the air tank via an introduction pipe and introduced into the air tank. However, when compressed air is directly introduced into the air tank from the socket, vibrations at the time of discharge reverberate the air tank and generate noise. For this purpose, a noise reduction pipe of an appropriate length projecting from the socket into the air tank is attached to eliminate noise. The silencing pipe is a straight pipe, is inserted vertically from the socket hole, and is screwed and fixed to the socket. Therefore, the discharged air is ejected directly downward toward the bottom of the air tank.

On the other hand, compressed air stored in an air tank is
The water contained in the atmosphere cooled by the air tank is condensed into water droplets by cooling, and is accumulated and stored as drain water at the bottom of the air tank. This drain water must be periodically drained. In the old days, drain water was drained by opening the drain cock manually before and after operation. However, in recent years, external operations such as storing the compressor itself in a box-shaped package have become more complicated, and users have become more maintenance-free compressors. The use of an auto drainer system is increasing.

There are various methods for automatically discharging the drain water accumulated and stored in the air tank. One example of such a method is described in Japanese Utility Model Application No. 3-97933 filed by the applicant of the present invention. FIG. 2 shows the structure of the automatic drain discharge device 3, and its operation is to automatically discharge drain water using pilot air from an unloader that controls the operation of the compressor. In 2, the piston 32 is operated by the pressure introduced from the pilot air inlet 31, and by the operation, the first seat 38 is opened by the valve body 33, and at the same time, the second seat for introducing the drain water from the air tank. The first sheet 38 is closed by closing the drain water stored in the drain storage chamber 36 by closing 39.
The space 37 above the drain chamber 36 from the open hole
The compressed air is discharged from the drain outlet 40 by compressed air. By repeating this operation for each unloader control, the drain water stored in the air tank is almost completely discharged. Therefore, in this mechanism, the drain water stored in the air tank during the load operation of the compressor is transferred to the drain storage chamber 36, and the unloader control for operating the compressor without load or stopping the operation is performed. The drain water of 36 is discharged, the transfer of the drain water of the air tank to the storage chamber 36 is stopped, and the pressure of the air tank is maintained.

[0005] In the compressor air tank having the above configuration, it has been discovered that there are two problems during long-term operation of the compressor.

One is that, in an air tank provided with the above-mentioned automatic drain discharge device, the level of the drain water stored in the air tank is disturbed by an air flow ejected from directly below the sound deadening pipe, thereby draining the drain water. It has been discovered that the water level at the suction port of the drain pipe is lowered, resulting in incomplete drain water discharge. That is, the drain water stored at the bottom of the air tank during the operation of the compressor has been transferred to the drain chamber of the automatic drain discharge device,
Due to a drop in the level of drain water, transfer is no longer performed,
As a result, the drain water in the air tank remains more than expected, leading to incomplete removal of water from the compressed air, thereby promoting rusting of the air tank.

[0007] The other is that the heated air by the compression heat spouted directly below from the sound deadening pipe is sprayed to the bottom of the air tank in which the drain water is stored, by always spraying the same location during operation. It was discovered that rusting of the part was accelerated and pinholes were formed in the air tank.
This is because the air tank used for the compressor uses high-strength carbon steel to reduce the mass of the compressor set as much as possible.
This is due to the fact that thin steel plates are used as much as possible within the specification range of pressure vessels. Therefore, the problem of rusting involves a serious problem relating to the life of the air tank and, consequently, the durability of the compressor.

[0008]

As described above,
In the silencing pipe protruding from the air tank of the compressor, the heated compressed air flow discharged from the silencing pipe promotes rust on the inner wall of the air tank and drain water accumulated and stored in the air tank. The problem was found that disturbs the water surface, lowers the drain water level, and incompletely drains the drain water.Therefore, the noise reduction effect of the noise reduction pipe is not reduced, and the cost increase factor is minimized. It is an object of the present invention to improve the above problem.

[0009]

SUMMARY OF THE INVENTION The present invention provides a reciprocating compressor,
Compressed air discharged from an air compressor such as a rotary compressor,
In the air tank which is connected by an introduction pipe and has a muffling pipe protruding into the air tank and is discharged, the muffling pipe protruding and provided in the air tank is a curved pipe, and the discharge port at the tip of the muffling pipe is substantially horizontal. This is an air tank of a compressor that discharges air in a direction away from a wall surface of the air tank near the installation position of the muffler pipe.

The air flow discharged from the sound deadening pipe is an air flow that does not change the level of the drain water accumulated and stored at the bottom of the air tank in order to reliably discharge the drain water from the drain pipe suction port. The curved pipe of the silencing pipe is an air tank of a compressor having an R shape or an L shape and having a shape easily insertable from a socket hole welded to the tank.

[0011]

According to the present invention, the discharge port at the end of the sound deadening pipe inserted from the socket hole welded to the air tank is bent in the lateral direction, and the discharge direction of the pipe does not lower the water level by disturbing the liquid level of the drain water. By discharging in the direction away from the air tank wall near the muffler pipe mounting position, such as in the longitudinal direction of the air tank, the promotion of rusting is eliminated and the liquid level of the drain water is reduced, The drain water is smoothly discharged from the drain pipe.

Various methods are conceivable for the means for discharging from the sound deadening pipe. For example, when the muffling pipe is a straight pipe, there is a method of closing the discharge port at the end and making a number of holes in the pipe side to disperse the discharge, or a method of dispersing by attaching a diffusion plate to the pipe end, etc. Since this also causes an increase in man-hours, the present invention has solved the above problem by the simplest method of bending the silencing pipe based on various experimental results.

[0013]

An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an air tank in which a silencing pipe of the present invention is a curved pipe and a discharge port at a tip thereof is mounted substantially in a lateral direction.
In FIG. 1, reference numeral 1 denotes an air tank of a compressor, 2 denotes a drain pipe extending from an upper portion of the air tank 1 to a reservoir for drain water 4 at a bottom of the air tank 1, and 3 denotes an automatic drain for automatically discharging drain water. The discharge device 5 is a curved pipe silence pipe. The curved pipe silencing pipe 5 is integrated by being brazed to the connection joint 5a, and after inserting the curved pipe silencing pipe 5 into the socket 1a welded to the air tank, the direction of the discharge port is determined and screwed and fixed. Is done. The drain pipe 3 has a connection elbow 22 connected to a mounting joint 21 via an O-ring 23 and a socket 1b welded to the air tank 1.
It is screwed and fixed to the air tank 1 by a mounting joint 21. The movable wheel 6 is attached to the leg 7 to which the moving wheel 6 is welded to the bottom of the air tank 1, and may have various forms such as a fixed leg or a fixed base.

The mounting position of the muffling pipe 5 is determined when the compressor body and a drive source such as a motor are mounted on the air tank 1, when the compressor body and the motor are separately provided, or when the compressor is mounted. The position of the socket 1a of the air tank 1 to which the muffling pipe 5 is mounted varies depending on the arrangement position of the load according to the model, but the upper surface of the substantially air tank 1 does not increase the space occupied by the compressor including the air tank. Attached to In this embodiment, the mounting position of the drain pipe 2 is illustrated on the upper surface of the air tank 1,
As another example, there is a case where the device is attached to a lower portion of the center of the air tank 1 or the like, and the device is provided with a device that automatically drains drain water by suction using the internal pressure of the air tank 1 regardless of the position where the device is attached. In this case, the present invention is applied.

The bending angle of the silencing pipe 5 is determined by the air tank 1
It is necessary that there is no restricting portion or the like which has an effect on the sound deadening effect or the discharge resistance at an angle which can be easily inserted from the hole of the socket 1a to be welded. Therefore, the curved tube is manufactured in an R shape bent by a bender or the like or an L shape bent in a V shape. When the discharge port is oriented in the horizontal direction, the air tank 1
When the sprayed part is sprayed on the wall of the body or mirror at a short distance, the possibility of pinholes due to rust increases as in the case where the sprayed part is sprayed on the bottom with a straight pipe And can be a source of noise. In addition, if the spraying is performed on the wall surface at a short distance, the discharge flow may flow along the inner surface of the body of the air tank and affect the liquid level. Therefore, the discharge port of the sound deadening pipe 5 of the curved pipe is located as far as possible from the wall surface. Point to Further, since the horizontal direction does not disturb the liquid surface near the suction port of the drain pipe 2 for sucking the drain water, when the liquid is directed in the longitudinal direction of the air tank 1, the horizontal direction of the discharge port is slightly The silencing pipe may be discharged in a slightly downward direction from the horizontal direction so as to make it easier to insert the muffling pipe even if it is directed in the horizontal direction.

The mounting method of the silencing pipe 5 is brazed and integrated with the connection joint 5a of the introduction pipe from the compressor, and the position is fixed by the tapered screw of the connection joint 5a. The method of regulating the direction of the outlet is not an element limiting the present invention, and various measures such as, for example, inserting a silencing pipe separately and fixing it with a connection joint can be easily considered.

[0017]

In the air tank for storing the compressed air discharged from the air compressor, the silencing pipe projecting and attached to the air tank is formed as a curved pipe, and the discharge port at the end of the silencing pipe is formed in a substantially horizontal direction. Therefore, the level of the drain water accumulated and stored in the air tank is not disturbed to lower the water level, and the drain discharge from the drain pipe is completely discharged to the lowermost end of the drain pipe suction port.
Drain water storage will always be kept to a minimum.

The discharge outlet of the bent pipe has a substantially horizontal discharge port and discharges in a direction away from the wall surface of the air tank. The problems of promoting spraying and rusting and generating noise are eliminated, and the pinhole-like piercing phenomenon at a specific location is eliminated.

When the sound-absorbing pipe is a curved pipe, the curved pipe has an R-shape or an L-shape and is shaped so that it can be easily inserted from a socket hole welded to the tank, so that the sound-muffling pipe does not lose its sound-muffling effect. In addition, an effect is obtained that, at a minimum cost, a sound-absorbing pipe having the above-mentioned effect can be attached.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an air tank provided with a curved pipe silencing pipe of the present invention.

FIG. 2 is a sectional view of an automatic drain discharge device as a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air tank 1a, 1b Socket (welding) 2 Drain pipe 3 Automatic drain discharge device 4 Drain water 5 Silence pipe 5a Connection joint 21 Mounting joint 22 Connection elbow 31 Pilot air intake 40 Drain discharge port

Claims (3)

[Claims] 1. An air tank connected to a compressed air discharged from an air compressor such as a reciprocating compressor or a rotary compressor through an introduction pipe and provided with a muffling pipe protruding into the air tank and discharging the air. A compression pipe in which a silencing pipe projecting and attached to an air tank is formed into a curved pipe, and a discharge port at a tip end of the silencing pipe is discharged in a substantially horizontal direction and in a direction away from an air tank wall close to a location where the silencing pipe is provided. Machine air tank. 2. When the silencing pipe projecting and attached to the air tank is a curved pipe and the discharge port at the end of the silencing pipe is substantially in the horizontal direction, the air flow discharged from the silencing pipe causes the drain water to drain from the drain pipe. 2. The air tank of a compressor according to claim 1, wherein the air flow does not fluctuate the level of the drain water accumulated and stored in the bottom portion of the air tank for reliable discharge. 3. When the silencing pipe projecting and attached to the air tank is a curved pipe, and the discharge port at the tip end of the silencing pipe is substantially in the horizontal direction, the curved pipe of the silencing pipe has an R-shape or an L-shape. 2. The air tank for a compressor according to claim 1, wherein said air tank has a shape which can be easily inserted from a socket hole to be welded.