JPH1030566A - Air compressor and pre-processing air dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make effective use of the energy of a refrigerating type air dryer fitted in an air compression device. SOLUTION: A pre-processing air dryer 3 is disposed at the upstream position of a refrigerating type air dryer 4 fitted on the discharge piping 2 of an air compressor 1, and the drain led through drain piping 6 horn an auto drain device 5 fitted on a refrigerating type air dryer is used in the cooling medium of the pre-processing air dryer 3. The pre-processing air dryer 3 cools compressed air with a heat exchanger, using the drain, discharges generated drain with an auto drain device 7, and discharges cooling medium drain from drain discharge piping 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air compressor having a refrigeration air dryer and a pretreatment air dryer.

[0002]

The present invention is a further development of the prior art described below.

It is an object of the present invention to provide an air compressor in which a refrigeration air dryer with improved energy efficiency is interposed in a discharge pipe and a pretreatment air dryer used in the air compressor.

[0004]

2. Description of the Related Art A refrigerating air dryer is interposed in a discharge pipe of an air compressor to remove moisture in compressed air. This refrigeration air dryer passes compressed air through the cooler of the refrigeration cycle, cools the compressed air that has been pressurized and heated in the air compressor to a temperature below the dew point temperature, and drains the water in the compressed air into a drain (other than water, (Including dust, bacteria, etc., and oil-containing air compressors further contain oil). The separated drain is discharged by a drain discharge device, for example, an automatic drain. The discharged drain is purified as it is by drain treatment and discharged.

In addition, heat is exchanged between the compressed air flowing into the cooling chamber and the temperature-decreased dry air flowing out of the cooling chamber to cool the compressed air flowing into the cooler and to flow out of the cooler. The relative humidity of the compressed air flowing out of the cooling chamber is reduced.

[0006]

According to a first aspect of the present invention, there is provided an air compressor, a discharge pipe for sending out compressed air generated by the air compressor, and a refrigeration air dryer interposed in the discharge pipe. The air compressor includes a pre-treatment air dryer that cools compressed air flowing through the discharge pipe with the drain generated by the refrigeration air dryer in the discharge pipe on the upstream side of the refrigeration air dryer with respect to the flow of the compressed air. It is an air compression device.

According to a second aspect of the present invention, there is provided an air compressor having an air compressor, a discharge pipe for sending out compressed air generated by the air compressor, and a refrigeration air dryer interposed in the discharge pipe. Regarding the flow of air, a heat exchanger is interposed in the discharge pipe on the upstream side of the refrigeration air dryer, compressed air is passed through the secondary side of the heat exchange element of the heat exchanger, and refrigeration is performed on the primary side of the heat exchange element. An air compression device characterized in that a drain removed from compressed air is guided in a cooling chamber of an air dryer.

According to a third aspect of the present invention, there is provided an air compressor having an air compressor, a discharge pipe for sending out compressed air generated by the air compressor, and a refrigeration air dryer interposed in the discharge pipe. Auto drain for discharging drain generated in the cooling chamber of the air dryer, and heat interposed in the discharge pipe upstream of the refrigeration air dryer so that the secondary side of the heat exchange element becomes a passage for compressed air. An air compressor having an exchanger and a drain pipe for guiding a drain discharged from an auto drain discharging a drain generated in a cooling chamber of a refrigeration air dryer to a primary side of a heat exchange element of a heat exchanger.

A fourth aspect of the present invention is the air compressor according to the second aspect, wherein the heat exchanger has an automatic drain discharge means for discharging drain flowing into a primary side of the heat exchange element.

According to a fifth aspect of the present invention, a drain discharge means for discharging a drain flowing into a primary side of a heat exchange element of a heat exchanger includes a drain for restricting a rise in the liquid level of the drain in the heat exchanger by overflow. An air compressor according to a third aspect of the present invention having an outlet.

A sixth invention of the present invention is the air compressor according to the second invention, wherein said heat exchanger has an automatic drain discharge means for discharging drain generated from compressed air at a secondary side of the heat exchange element. is there.

According to a seventh aspect of the present invention, the automatic drain discharging means for discharging drain generated from compressed air on the secondary side of the heat exchange element is an automatic drain communicating with the secondary side of the heat exchange element. An air compressor according to the invention.

According to an eighth aspect of the present invention, a discharge port of an auto drain communicating with a secondary side of the heat exchange element and a drain outlet of a secondary side of the heat exchange element of the heat exchanger are connected via a check valve. In the seventh aspect, the check valve is disposed so as to allow the drain from the drain outlet to pass therethrough, and the downstream side of the check valve and the discharge port of the auto drain are joined to the collecting pipe. It is an air compression device of an above-mentioned.

A ninth aspect of the present invention is the air compressor according to the eighth aspect, wherein the automatic drain communicating with the secondary side of the heat exchange element is connected to the most upstream side of the drain collecting pipe.

A tenth invention of the present invention is the air compression device according to the eighth or ninth invention, further comprising an oil supply type air compressor, wherein an oil / water separation device is interposed in said drain collecting pipe.

According to an eleventh aspect of the present invention, there is provided a housing having a compressed air inlet on one side and a compressed air outlet on the other side, and a heat exchange element disposed in the housing and communicating with the compressed air outlet. A drain chamber downstream of the heat exchange element and having a cross section larger than the cross section of the heat exchange element, and a drain chamber communicating with the outlet of the compressed air, and between the housing, the heat exchange element and the drain chamber. A pretreatment air dryer having a space into which a cooling medium is introduced.

A twelfth aspect of the present invention is the pretreatment air dryer according to the eleventh aspect, wherein the cross-sectional area of the space into which the cooling medium is introduced is larger than the cross-sectional area of the heat exchange element.

A thirteenth invention of the present invention is the pretreatment air dryer according to the twelfth invention, further comprising a gas-liquid separation means for separating gas-liquid of the cooling medium introduced into the space into which the cooling medium is introduced. .

According to a fourteenth aspect of the present invention, the gas-liquid separating means is a housing having an open upper portion, and a lid for covering the upper portion of the housing with a gap for discharging gas from the upper portion of the housing. A pretreatment air dryer according to a thirteenth invention.

According to a fifteenth aspect of the present invention, there is provided the pretreatment air according to the eleventh aspect, wherein the drain chamber has a drain outlet, and the casing has a cooling medium outlet for overflowing the cooling medium. It is a dryer.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 (Overall Configuration) FIG. 1 is a flow sheet showing an overall embodiment of the present invention. In the figure, a pretreatment air dryer 3 and a refrigeration air dryer 4 are interposed in a discharge pipe 2 of an air compressor 1 in accordance with a flow of compressed air.
An automatic drain 5 for discharging drain is attached to the refrigeration air dryer 4, and the drain discharged from the automatic drain 5 flows into the pretreatment air dryer 3 via a drain pipe 6. An auto drain 7 is provided for discharging drain generated in the pretreatment air dryer 3. In order to discharge the drain sent through the drain pipe 6, the pretreatment air dryer 3 is provided with a drain discharge pipe 8.

The outline of the operation in FIG. 1 is as follows. The air is sucked into the air by an air compressor 1, and the pressurized air whose pressure has been raised and raised is sent to a pretreatment air dryer 3 through a discharge pipe 2. The compressed air is cooled by using the drain discharged from the drain pipe 4 by the auto drain 5 and sent through the drain pipe 6 as a cooling medium, and water (hereinafter referred to as “drain”) containing dust, bacterial oil, and the like in the compressed air is partially separated. It is discharged from 7. The drain sent from the refrigeration air dryer 4 used as the cooling medium is heated by heat exchange with the compressed air and discharged from the drain discharge pipe 8.

(Air Compressor) The air compressor 1 has an air compressor 11 whose intake port communicates with the atmosphere through a silencer 11a, and inhales and pressurizes the atmosphere. The air compressor 11 may be of a non-lubricating type or a lubricating type. The air compressor 11 is attached to an air tank 12 together with a motor 13, and the motor 13 and the air compressor 11 are connected by a belt device 14. The discharge port of the air compressor 11 communicates with the air tank 12. The discharge pipe 2 is connected to an air outlet 12 a of the air tank 12. In order to discharge the drain accumulated inside the air tank 12,
A drain discharge valve 12b is provided. This valve is a manual valve.

The operation of the air compressor 1 is as follows. When the electric motor 13 is energized, the air compressor 11 is driven via the belt device 14, and the air is sucked through the inlet through the silencer 11a to be compressed and pressurized. The temperature of the compressed air rises as the pressure rises. The air tank 12 is provided with a pressure switch (not shown) for detecting the compressed air pressure in the air tank 12, and the pressure switch is not shown when the pressure switch detects that the compressed air pressure in the air tank 12 has reached the set upper limit pressure. A signal is sent to the control device, and the control device cuts off the electric motor 13. The compressed air is sent from the air tank 12 through the discharge pipe 2 by use,
The compressed air pressure in the air tank 12 decreases. The pressure switch detects that the compressed air pressure has reached the set lower limit pressure, and a signal thereof is sent to a control device (not shown), and the control device energizes the electric motor 13. Thus, the air compressor 11 is operated, compresses the air sucked from the suction port through the silencer 11a, and sends the compressed air to the air tank 12.
Thus, the pressure of the compressed air in the air tank 12 rises, and when the pressure reaches the set upper limit pressure, the pressure switch detects this pressure and sends a signal to a control device (not shown), and the control device stops energizing the electric motor 13.

Thus, the operation of the air compressor 11 is stopped by detecting the upper limit pressure of the pressure switch, and the on / off control of operating the air compressor 11 by detecting the lower limit pressure of the compressed air pressure due to use by the pressure switch to detect the lower limit pressure. Done.

Alternatively, when the air compressor 11 has an unloader, when the pressure switch detects the set upper limit pressure, the air compressor 11 does not suck the atmosphere while the motor 13 is in the operating state. When the pressure switch detects the set lower limit pressure, the unloader is released and the air is sucked to start the compression when the pressure switch detects the set lower limit pressure.

Thus, the unloader is operated by detecting the upper limit pressure of the pressure switch to perform the no-load operation of the air compressor 11, and the unloader is released by detecting the lower limit pressure of the pressure switch to perform the load operation.

FIG. 2 shows a flow sheet when a refueling type air compressor is used. 2, the same functional portions as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, for example, a screw compressor 15 is used as an oil supply type air compressor. The screw compressor 15 is supplied to a suction space or a compression space. The screw compressor 15 has a discharge port 15a connected to an oil separator 16, and separates oil in the compressed air by passing compressed air through an internal oil separation element, for example, a metal fiberized material. The separated compressed air is sent to the air tank 12 through the pipe 16a, and the separated oil is supplied to the suction space or the compression space of the screw compressor 15 via the return oil pipe 16b by the compressed air pressure applied to the oil separator 16 or a pump (not shown). Bring to reflux.

(Pretreatment Air Dryer) As shown in FIG. 3, the pretreatment air dryer 3 has a housing 17 having an open top.
And the upper part is covered with a lid 18. The lid 18 is the housing 1
7 has a peripheral edge 18 a that covers the upper edge and surrounds the outer periphery of the upper edge of the housing 17. Thereby, a gap g is provided between the housing 17 and the lid 18 from directly above the edge of the housing 17 to the outer peripheral side following the edge of the housing 17, and the gas inside the housing 17 can be released. Is available. The gap g may be filled with a filter (not shown) such as a sponge having air permeability.

The upper part of the pretreatment air dryer 3 is a heat exchanger 3A and the lower part is a drain chamber 3B for separating drain. The housing 17 is partitioned by a partition plate 17a.

A heat exchange element 19 is provided in the heat exchanger 3A. One end of the heat exchange element 19 is connected to a discharge pipe 2 which communicates with the air compressor 1 at one end at a compressed air inlet 3a of the pretreatment air dryer 3 so that compressed air passes through the inside of the tube, and the other end is connected to a drain chamber. 3B
Is fixed to the partition plate 17a so as to communicate with the partition plate 17a.

Compressed air outlet 3 of pretreatment air dryer 3
b and the drain chamber 3B are connected by an outlet pipe 9 passing through the heat exchanger 3A. This outlet pipe 9 is located in the drain D guided to the space 20 on the primary side of the heat exchanger 3A with respect to the heat exchange element 19, and functions as a heat exchange element. The outlet pipe 9 is a straight pipe in order to minimize drainage since it is sent out according to the flow. Alternatively, the outlet pipe 9 may be directly raised from the drain chamber 3B and then started up.

A drain pipe 6 led from the refrigeration air dryer 4 is connected to the lid 18, and the drain, which is a gas-liquid mixed pressure fluid sent through the drain pipe 6, flows into the gas-liquid separation space 21 below the lid 18. It is supposed to.

The heat exchanger 3A is provided with a discharge means for discharging the heat exchange element with the drain accumulated in the drain storage space 20 on the primary side of the heat exchanger 19. The means for discharging the drain is a drain outlet 3c provided as an overflow port, whereby the liquid level of the drain flowing into the drain storage space 20 on the primary side of the heat exchange element 19 is kept constant. Thereby, the gas-liquid separation space 2
Keep the volume of 1 constant. A manual valve is provided near the bottom (partition plate) of the heat exchanger 3A to discharge the drain D in the heat exchanger 3A.

The drain chamber 3B is provided with a drain outlet 3d for discharging the drain in the compressed air generated in the drain chamber 3B.

(Refrigeration air dryer) The refrigeration air dryer 4 includes a refrigerant compressor 41 for compressing a cooling medium.
A pipe 43 for sending the refrigerant compressed by the refrigerant compressor 41 to the condenser 42, an air-cooled condenser 42, a tank 44 for storing the refrigerant liquefied by the condenser 42, and a capillary for reducing and sending the refrigerant from the tank 44. The cooling chamber 46 cools the compressed air using the refrigerant sent out under reduced pressure from the tube 45 and the capillary tube 45 as a cooling medium.
As a main conduit.

The discharge side of the refrigerant compressor 41 and the cooling chamber are connected by a bypass pipe 49 interposed with a capacity control valve 48 for detecting the refrigerant temperature in the suction pipe 47 and opening the refrigerant temperature to a predetermined temperature. 46, and a part of the refrigerant is
Is bypassed.

Further, a heat exchanger 5 for exchanging heat between the compressed air flowing into the cooling chamber 46 and the compressed air flowing out of the cooling chamber 46.
1 is attached. The heat exchanger 51 guides the discharge pipe 2 connected to the compressed air outlet 3b of the pretreatment air dryer 3 and further connects the discharge pipe 2 with a heat exchange element 46a and a heat exchange element through which the refrigerant in the cooling chamber 46 passes. The space 46a is led to a space between the housing 46b and the housing 46b. A discharge pipe 2 for sending compressed air to the demand side is led out of the casing 46b of the cooling chamber 46, and the discharge pipe 2 through which the cooled compressed air passes.
Is connected to the demand side through the heat exchanger 51.

In order to discharge the drain generated in the space in the cooling chamber 46 through which the compressed air passes, the casing 4
A drain outlet 46c is provided at the bottom of the drain pipe 6b, and a drain pipe 5c is provided between the drain outlet 46c and the inlet of the automatic drain 5.
It is tied with three.

The refrigeration air dryer 4 performs a normal Rankine cycle as a refrigeration cycle. The refrigerant compressed by the refrigerant compressor 41 is cooled by blowing air through an air-cooled condenser 42 through a refrigerant pipe 43. And is sequentially pushed out to the refrigerant tank 44, and is discharged through the capillary tube 45 into the heat exchange element 46 a of the cooler 46 to be decompressed to lower the temperature, thereby cooling the compressed air flowing outside the heat exchange element 46 a. Then, the temperature rises and is sucked into the refrigerant compressor 41 through the refrigerant suction pipe 47.

Thus, the compressed air sent from the pretreatment air dryer 3 to the refrigeration air dryer 4 is cooled by the compressed air already cooled by the heat exchanger 51, and then cooled by the heat exchange element 46 a in the cooling chamber 46. Upon being cooled by the refrigerant passing therethrough, it exits to the discharge pipe 2 from the cooling chamber 46 to the demand side and passes through the heat exchanger 51, while cooling the compressed air flowing into the refrigeration air dryer 4 and drying itself. The air is sent from the refrigeration air dryer 4 as air.

(Supply of Cooling Medium to Pretreatment Air Dryer) The auto drain 5 for discharging the drain in the compressed air generated in the cooler 46 of the refrigeration air dryer 4 is supplied to the pretreatment air dryer 3 through the drain pipe 6. Are linked.

(Drain discharge pipe generated by the pretreatment air dryer) A drain pipe 2 is provided between the drain outlet 3d at the bottom of the drain chamber 3B of the pretreatment air dryer 3 and the automatic drain 7.
It is tied with 4. The drain outlet of the automatic drain 7 is connected to the most upstream of the drain collecting pipe 25.

The drain outlet 3c for discharging the drain in the drain storage space 20 of the pretreatment air dryer 3 is connected to the junction 2 of the drain collecting pipe 25 on the downstream side with the junction of the automatic drain 7.
5a is connected by a pipe 26. Check valve 2 in piping 26
7 are interposed. The check valve 27 is obtained by flowing the drain from the drain outlet 3c to the junction 25a, but the fluid cannot flow in the reverse direction. The pipe 26 is lower than or at the same height as the drain outlet 3c. Drain is discharged to the downstream of the junction 25a of the drain collecting pipe 25 via a gas-liquid separator (not shown). However, when an oil supply type screw compressor 15 shown in FIG. 2 is employed, since the oil is mixed in the drain, the drain is guided to the oil / water separator 28, and the fresh water from which the oil in the drain is separated is discharged. And recover the oil. The oil / water separator 28 is of an open type or a type capable of separating oil / water even under pressure. In the case of the open type, pipes are provided to send drain to the oil / water separator 28 via a gas-liquid separator (not shown), An oil-water separator having a gas-liquid separation function is used.

(Oil-Water Separation Apparatus) Examples of the oil-water separation apparatus include a specific gravity difference separation type utilizing a difference in specific gravity between water and oil, an apparatus using an oil adsorbent, or an apparatus using both of them.

Although FIG. 4 seems to use only the oil adsorbent at first glance, the specific gravity difference separation type and the oil adsorbent are used. (Act No. 4-33430, Registration No. 21185598)
No.).

The container 31 contains a particulate polypropylene oil adsorbent 32. The drain inlet 29a is connected to the drain set 25.

The oil / water separator 28 is screwed into the oil / water separator 28 through the drain inlet 29a of the drain pipe fitting 29.
The mixed gas-liquid mixture of the compressed air and the drain flows into the inside. Air that has entered the container 31 from the drain inlet pipe joint 29 is decompressed. The oil and water in the drain that has entered the oil-water separator 28 descend under their own weight, the oil is adsorbed by the oil absorbing material 32, and the water first enters the gap between the oil absorbing materials 32 and accumulates at the bottom of the container 31. When the amount of water increases and the water level rises, the oil absorbing material 32 that has adsorbed the oil floats. Since the air that has entered the oil-water separator 28 in a state separated from the drain enters the large space of the container 31 from the pipe,
Automatic drain 2
Due to the back pressure applied from the three sides, the gas is released into the atmosphere at a slow speed from the pores 33a of the exhaust port 33. Further, the air mixed into the water gradually escapes since the water that has flowed so far is stored in the container 31 and is discharged to the atmosphere through the pore 33a of the exhaust port through the upper space. Therefore, even if the drain and the air are suddenly sent by the operation of the auto drain 23, the oil / water separator 28 is a closed tank, and the air expands and decompresses in the tank, so that the drain splashes on the floor. There is no pollution.

Thus, when the oil absorption of the oil absorbing material 32 becomes saturated by use, a considerable amount of water is also stored in the container 31.

Then, the lid 34 is opened, the container 31 is transported, and only water is allowed to flow into the sewage. The oil absorbing material 32 is accumulated and passed to a treating company for incineration or disposal.

FIG. 5 shows another side of the oil-water separation device. This device is an open type, and the collecting pipe 25 is connected to an oil processing tank 55 via a gas-liquid separator 54.

The drain in the gas-liquid mixed state is discharged to the drain collecting pipe 25.
The air is released into the atmosphere by the gas-liquid separator 54 and enters the oil floating separation chamber 56 of the oil processing tank 55. In the oil floating separation chamber 56, the drain is separated into the oil F and the water W by a specific gravity difference, and the oil F floats on the water W. The water W passes through the opening 57 and communicates therewith, and thus enters the water storage chamber 58. When the drain continues to flow into the oil floating separation chamber 56, the oil floating separation chamber 56
Rises and the liquid level in the water storage chamber 58 rises.

When the liquid level in the water storage chamber 58 reaches the upper limit water level, the upper limit water level signal detected by the float switch 59 is sent to the controller 60, which drives the pump 61,
The water W in the water storage chamber 58 is sucked out.

The water W passes through the communication pipe 64 between the oil treatment tank 55 and the oil adsorption tank 62, enters the oil adsorption tank 62, and receives the oil adsorbent 63.
The oil W rises in the oil adsorbent 63 against the medium pressure drop. During this time, the residual oil contained in the water W is adsorbed by the oil adsorbent 63 and becomes fresh water. Then, the fresh water which has been sent to the upper part of the oil adsorption tank 62 is pushed out and discharged from the fresh water discharge pipe 65, or is sent to the next water treatment facility as required. Thus, when the water level in the water storage chamber 58 falls and reaches the lower limit water level, the float switch 59 issues a lower limit water level signal, and the control device 60 stops the pump 61.

(Operation of Overall Structure) Air Compressor 1
The compressed air sent from the storage device first enters the pretreatment air dryer 3 and passes through the heat exchange element 19 when the drain storage space 2
During the cooling, the water is cooled by the cooled drain D sent from the refrigeration type air dryer 4, and as it cools, the water starts to be generated from the moisture and the like in the compressed air and enters the drain chamber 3B. In the drain chamber 3B, the pressure drop, the temperature drop, and the cross section of the drain chamber 3B through which the compressed air passes are large, so that the flow of the compressed air is slow. The compressed air that has exited the drain chamber 3B passes through the outlet pipe 9, and enters the refrigeration air dryer 4 from the compressed air outlet 3b of the pretreatment air dryer 3. As described above, in the refrigerating air dryer 4, the inflowing compressed air is cooled by the cooled compressed air flowing out of the heat exchanger 51, and the inflowing compressed air is heated and dried. The inflowing compressed air passes through the heat exchanger 51, enters the cooler 46, is cooled by the refrigerant generated by the refrigeration cycle, and the moisture in the compressed air is taken out to be drained. This drain is drained by the auto drain 5 It flows into the pretreatment air dryer 3 through the drain pipe 6. The drain contains compressed air and is a gas-liquid mixed fluid. Therefore, the gas-liquid mixed fluid that has entered the gas-liquid separation space 21 in the pretreatment air dryer 3 suddenly exits into a large-volume space, so that the flow velocity drops sharply, the drain enters the drain storage space 20, and the compressed air It is released into the atmosphere through the gap g.

The compressed air, which has been cooled by the cooler 46 and from which water has been removed, passes through the discharge pipe 2, passes through the above-described heat exchanger 51 on the way, and is sent to the demand side.

The auto drain 7 in the pretreatment air dryer 3 is intermittently a floating valve 7a having a specific gravity smaller than that of the drain.
Is floated by the drain and closes the valve port 7b after the drain is discharged. Therefore, the drain is intermittent, and a small amount of compressed air is sent to the drain collecting pipe 25 due to the structure of the valve. When this drain is sent out, the drain collecting pipe 25 is in a pressurized state, but there is a check valve 27 so that it passes through the pipe 26 and the drain storage space 2
There is no backflow to zero. Then, the water passes through the drain collecting pipe 25, enters the oil / water separator 28, is separated from the oil / water, and the fresh water is discharged.

While the automatic drain 7 is not opened, the drain D in the drain storage space 20 is discharged from the drain outlet 3c and the check valve 2
7, the water enters the drain collecting pipe 25 at the junction 25a and is sent to the oil / water separator 28 at a water level difference.

When an oilless air compressor is used, the oil / water separator 28 is not provided and the drain collecting pipe 25 is used.
It is released from.

The amount of drain generated when the compressor is operated for compression for 60 minutes (compression rate of 100%) is as follows: A The amount of drain generated in the air tank (x) is determined by the compressed air pressure temperature 7 kgf / cm ² 35 Atmospheric pressure dew point temperature at 2 ° C is 2 ° C and water in 1m ³ of saturated air is 5.56g
Therefore, when the discharge amount is 100 m ³ / H, 5.56 g / m ³ × 100 m ³ / H = 556 g / H−100 m ³ / H, the amount of water contained in 80% at 35 ° C. is 3
9.5 g / m ³ 39.5 × 0.8 × 100 m ³ / H = 3160 g / H−
x = − = 3160 g / H−556 g / H = 2604
g / H → 2604cc / H B The amount of drain generated by the refrigeration air dryer is (Y)
Is 7Kgf / cm ² and the atmospheric pressure dew point at 10 ° C is-
The moisture in 1 m ³ of saturated air at that time is 1.16 g
1.16 g / m ³ × 100 / H = 116 g / H−Y = − = 556 g / H-116 g / H = 440 g /
Therefore, a drain of 440 cc / H is discharged from the auto drain 52 and enters the pretreatment air dryer. Since the temperature of the drain water is 10 ° C. at the outlet of the air dryer, the heat energy that can be removed by the pretreatment air dryer in which the drain water is also 10 ° C. is 11 ηkcal / H, where η is the heat exchange efficiency.

[0062]

[Embodiments] These are described together with the embodiments.

[0063]

According to a first aspect of the present invention, there is provided an air compressor having an air compressor, a discharge pipe for sending compressed air generated by the air compressor, and a refrigeration air dryer interposed in the discharge pipe. With respect to the flow of compressed air, it is necessary to remove drain by having a pretreatment air dryer that cools the compressed air flowing through the discharge pipe using the drain generated by the refrigeration air dryer in the discharge pipe on the upstream side of the refrigeration air dryer as the refrigerant. The dehumidifying effect of the compressed air can be improved without consuming the energy. That is,
Pretreatment air dryers do not require new energy for drain removal.

According to a second aspect of the present invention, there is provided an air compressor having an air compressor, a discharge pipe for sending out compressed air generated by the air compressor, and a refrigeration air dryer interposed in the discharge pipe. A heat exchanger is interposed in the discharge pipe on the upstream side of the refrigeration air dryer with respect to the air flow, and the compressed air is passed through the secondary side of the heat exchange element of the heat exchanger, and the refrigeration type is placed on the primary side of the heat exchange element. By introducing the drain removed from the compressed air in the cooling chamber of the air dryer, it is possible to improve the dehumidifying effect of the compressed air while maintaining the energy consumption only with the heat exchanger and the piping.

A third invention of the present invention relates to an air compressor having an air compressor, a discharge pipe for sending out compressed air generated by the air compressor, and a refrigeration air dryer interposed in the discharge pipe. Auto drain for discharging drain generated in the cooling chamber of the air dryer, and heat interposed in the discharge pipe upstream of the refrigeration air dryer so that the secondary side of the heat exchange element becomes a passage for compressed air. A simple pipe by having an exchanger and a drain pipe that guides the drain discharged from the auto drain discharging the drain generated in the cooling chamber of the refrigeration air dryer to the primary side of the heat exchange element of the heat exchanger. It is possible to improve the dehumidifying effect of the compressed air while maintaining the energy consumption with only the piping and the heat exchanger.

According to a fourth aspect of the present invention, there is provided the air compressor according to the second aspect, wherein the heat exchanger has an automatic drain discharge means for discharging drain flowing into a primary side of the heat exchange element. Continuous operation is possible.

According to a fifth aspect of the present invention, the drain discharge means for discharging the drain flowing into the primary side of the heat exchange element of the heat exchanger includes a drain for restricting a rise in the level of the drain in the heat exchanger by overflow. By using the air compression device according to the third aspect of the present invention having the outlet, the used drain discharged from the refrigeration air dryer can be discharged only with the piping. In addition, the level of the drain can be kept constant.

According to a sixth aspect of the present invention, there is provided the air compressor according to the second aspect, wherein the heat exchanger has an automatic drain discharge means for discharging drain generated from compressed air at a secondary side of the heat exchange element. As a result, the drain removed from the compressed air can be automatically discharged from the heat exchanger.

According to a seventh aspect of the present invention, the automatic drain discharge means for discharging the drain generated from the compressed air on the secondary side of the heat exchange element is an automatic drain communicating with the secondary side of the heat exchange element. By using the air compression device according to the invention, drain in the compressed air can be intermittently discharged without using electric power.

According to an eighth aspect of the present invention, there is provided an automatic drain communicating with a secondary side of the heat exchange element, a drain outlet on a secondary side of the heat exchange element of the heat exchanger, and a check valve. The seventh aspect of the present invention is that the check valve is disposed so as to allow the drain from the drain outlet to pass therethrough, and the downstream side of the check valve and the discharge port of the auto drain are joined to a collecting pipe. When the drain generated by the compressed air is discharged by the air compressor, the drain can be sent from the refrigeration air dryer to the primary side of the heat exchange element and flow into the primary side of the heat exchange element to be mixed into the stored drain. Absent. In addition, while the auto drain communicating with the secondary side of the heat exchange element is closed, the drain stored in the primary side of the heat exchange element can be discharged.

According to a ninth aspect of the present invention, there is provided the air compressor according to the eighth aspect, wherein the automatic drain communicating with the secondary side of the heat exchange element is connected to the most upstream side of the drain collecting pipe. Therefore, even if the drain manifold is arranged horizontally,
The possibility that the drain collects in the drain collecting pipe is reduced.

According to a tenth aspect of the present invention, a drain is provided by providing an air compressor according to the eighth or ninth aspect of the present invention having an oil supply type air compressor and an oil / water separator interposed in the drain collecting pipe. The oil inside can be removed.

According to an eleventh aspect of the present invention, there is provided a housing provided with a compressed air inlet on one side and a compressed air outlet on the other side, and a heat exchange element disposed in the housing and communicating with the compressed air outlet. A drain chamber downstream of the heat exchange element and having a cross section larger than the cross section of the heat exchange element, and a drain chamber communicating with the outlet of the compressed air, and between the housing, the heat exchange element and the drain chamber. By providing a pretreatment air dryer having a space into which a cooling medium is introduced, it is possible to interpose the discharge pipe simply by combining a heat exchanger with a simple configuration and a drain chamber.

According to a twelfth aspect of the present invention, there is provided the pretreatment air dryer according to the eleventh aspect, wherein the cross-sectional area of the space into which the cooling medium is introduced is larger than the cross-sectional area of the heat exchange element. , And the drain can be easily discharged.

According to a thirteenth aspect of the present invention, there is provided a pretreatment air dryer according to the twelfth aspect, further comprising a gas-liquid separating means for separating gas-liquid of the cooling medium introduced into the space where the cooling medium is introduced. This eliminates the need for a separate gas-liquid separator,
Also, piping is simplified.

According to a fourteenth aspect of the present invention, the gas-liquid separating means is a housing having an open upper portion, and a lid for covering the upper portion of the housing with a gap for discharging gas from the upper portion of the housing. By using the pretreatment air dryer according to the thirteenth invention,
Compressed air can be removed from the drain flowing in a gas-liquid mixed state.

A fifteenth aspect of the present invention is the pretreatment air according to the eleventh aspect, wherein the drain chamber has a drain outlet, and the casing has a cooling medium outlet for overflowing the cooling medium. By using the dryer, the drain generated from the compressed air and the drain guided from the refrigeration air dryer can be separately discharged.

[Brief description of the drawings]

 Each of the drawings shows an embodiment of the present invention,

FIG. 1 is a flow chart of an air compressor provided with an oilless air compressor.

FIG. 2 is a flow chart of an air compression device provided with a refueling type air compressor.

FIG. 3 is a flow sheet showing a detailed configuration of FIG. 2;

FIG. 4 is a longitudinal sectional view showing one example of an oil-water separation device.

FIG. 5 is a flow sheet showing another example of the oil-water separation device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air compressor 2 ... Discharge piping 3 ... Pretreatment air dryer 3A Heat exchanger 3B ... Drain chamber 3a ... Compressed air inlet 3b ... Compressed air outlet 3c
... Drain outlet 3d ... Drain outlet 4 ... Refrigeration air dryer 5 ... Auto drain 6 ... Drain piping 7 ... Auto drain 8 ... Drain discharge pipe 9 ... Outlet piping 11 ... Air compressor 11a ... Muffler 12 ... Air tank 12a ... Air intake Outlet 12b Drain discharge valve 13 Electric motor 14 Belt device 15 Screw compressor 15a Discharge port 16 Oil separator 16a Pipe 16b Return oil pipe 17 Housing 17a Partition plate 18 Lid 18a Peripheral edge 19 Heat exchange element 20 Drain storage space 21 Gas-liquid separation space 22 Manual valve 24 Drain pipe 25 Drain collecting pipe 25a Junction 26 Pipe 27 Check valve 28 Oil / water separator 29 Drain inlet pipe joint 29a ... drain inlet 31 ... container 32 ... oil absorbing material 33 ... exhaust outlet 33a ... pore 34 ... lid 41 ... refrigerant compressor 42 ... coagulation Machine 43 ... pipe 44 ... refrigerant tank 45 ... capillary tube 46 ... cooler 46a ... heat exchanger element 46b ... housing 4
6c Drain outlet 47 Suction pipe 48 Capacity control valve 49 Bypass pipe 51 Heat exchanger 52 Auto drain 53 Drain pipe 54 Gas-liquid separator 55 Oil treatment tank 56 Oil floating separation chamber 57 Mouth 58 ... Water storage chamber 59 ... Float switch 60 ... Control device 61 ... Pump 62 ... Oil adsorption tank 63 ... Oil adsorbent 64 ... Communication pipe 65 ... Clean water discharge pipe g ... Gap F: Oil D ... Drain W ... Water

Claims (15)

[Claims] An air compressor having an air compressor, a discharge pipe for sending out compressed air generated by the air compressor, and a refrigeration air dryer interposed in the discharge pipe.
An air compressor having a pretreatment air dryer that cools compressed air flowing through a discharge pipe using a drain generated by the refrigeration air dryer as a refrigerant in a discharge pipe upstream of the refrigeration air dryer with respect to a flow of compressed air. . 2. An air compressor comprising: an air compressor; a discharge pipe for sending compressed air generated by the air compressor; and a refrigeration air dryer interposed in the discharge pipe.
A heat exchanger is interposed in the discharge pipe on the upstream side of the refrigeration air dryer with respect to the flow of the compressed air, and the compressed air is passed through the secondary side of the heat exchange element of the heat exchanger and refrigerated on the primary side of the heat exchange element. An air compression device, wherein a drain removed from compressed air is introduced in a cooling chamber of an air dryer. 3. An air compressor comprising: an air compressor; a discharge pipe for sending out compressed air generated by the air compressor; and a refrigeration air dryer interposed in the discharge pipe.
An auto drain for discharging drain generated in the cooling chamber of the refrigeration air dryer, and a discharge pipe upstream of the refrigeration air dryer are interposed so that the secondary side of the heat exchange element is a passage for compressed air. An air compressor comprising: a heat exchanger; and a drain pipe for guiding a drain discharged from an auto drain discharging a drain generated in a cooling chamber of a refrigeration air dryer to a primary side of a heat exchange element of the heat exchanger. 4. The air compressor according to claim 2, wherein said heat exchanger has an automatic drain discharge means for discharging drain flowing into a primary side of the heat exchange element. 5. A drain discharge means for discharging a drain flowing into a primary side of a heat exchange element of a heat exchanger, wherein a drain outlet for limiting a rise in the level of the drain in the heat exchanger by overflow is provided. 5. The air compressor according to 4. 6. The air compressor according to claim 2, wherein said heat exchanger has an automatic drain discharge means for discharging drain generated from compressed air at a secondary side of the heat exchange element. 7. The air compressor according to claim 5, wherein the automatic drain discharging means for discharging the drain generated from the compressed air on the secondary side of the heat exchange element is an automatic drain communicating with the secondary side of the heat exchange element. apparatus. 8. An exhaust port of an automatic drain communicating with a secondary side of the heat exchange element and a drain outlet of a secondary side of the heat exchange element of the heat exchanger communicate with each other through a check valve. 8. The air compressor according to claim 7, wherein the stop valve is arranged to allow the drain from the drain outlet to pass therethrough, and the downstream side of the check valve and the outlet of the auto drain are joined to the collecting pipe. 9. The air compressor according to claim 8, wherein the auto drain communicating with the secondary side of the heat exchange element is connected to the most upstream side of the drain collecting pipe. 10. The air compressor according to claim 8, further comprising an oil supply type air compressor, wherein an oil-water separator is interposed in the drain collecting pipe. 11. A housing provided with an inlet for compressed air on one side and an outlet for compressed air on the other side, a heat exchange element disposed in the housing and communicating with the outlet for compressed air, and a downstream side of the heat exchange element. A drain chamber having a cross section larger than the cross section of the heat exchange element on the side thereof and communicating with the outlet of the compressed air; and a space between the housing and the heat exchange element and the drain chamber, into which a cooling medium is introduced. And having a pretreatment air dryer. 12. The pretreatment air dryer according to claim 11, wherein a cross-sectional area of the space into which the cooling medium is introduced is larger than a cross-sectional area of the heat exchange element. 13. The pretreatment air dryer according to claim 12, further comprising gas-liquid separation means for separating gas-liquid of the cooling medium introduced into the space into which the cooling medium is introduced. 14. The gas-liquid separating means according to claim 13, wherein the gas-liquid separating means is a housing having an open upper portion, and a lid for covering the upper portion of the housing with a gap for discharging gas from the upper portion of the housing. Pretreatment air dryer. 15. The pretreatment air dryer according to claim 11, wherein the drain chamber has a drain outlet, and the housing has a cooling medium outlet for overflowing the cooling medium.