JP2022171368A - compressor and heat exchanger - Google Patents

Abstract

To reduce drain flowing out from a heat exchanger to a compressor body or a supply device.SOLUTION: A compressor comprises a compressor body that compresses and discharges air, and a heat exchanger connected downstream of the compressor body in the flow of compressed air discharged from the compressor body and exchanging heat between the compressed air and a cooling medium. The heat exchanger (20) comprises: an inlet (21) into which the compressed air flows; an outlet (22) through which the compressed air flows out; a cooling unit (23) that exchanges heat between the compressed air having flown into from the inlet (21) and the cooling medium to cool the compressed air; and a drain separation unit (24) that raises the compressed air having passed through the cooling unit (23) and separates drain from the compressed air.SELECTED DRAWING: Figure 2

Description

The present invention relates to compressors and heat exchangers.

Patent Literature 1 describes an oilless screw compressor that includes a compressor body and a plate heat exchanger that cools compressed air discharged from the compressor body. Compressed air cooled by the plate heat exchanger is supplied to external equipment and the like through a supply pipe. Further, a drain pipe is connected to the lower side of the supply pipe, and drain generated during cooling of the compressed air is discharged through the drain pipe.

Patent No. 4685474

However, in the oilless screw compressor of Patent Document 1, most of the drain generated in the plate heat exchanger is discharged from the drain pipe, but the drain accompanied by the flow of compressed air is discharged from the drain pipe. may flow downstream with the compressed air.

SUMMARY OF THE INVENTION An object of the present invention is to prevent drain generated in a heat exchanger from flowing to a downstream compressor body and supply equipment.

One aspect of the present invention is a compressor body that compresses and discharges air, and is connected downstream of the compressor body in a flow of compressed air discharged from the compressor body, and the compressed air and a cooling medium are connected. a heat exchanger for exchanging heat between the heat exchanger, the heat exchanger having an inlet into which the compressed air flows, an outlet from which the compressed air flows out, and the compressed air flowing in from the inlet and the cooling medium; Provided is a compressor comprising: a cooling section for cooling the compressed air by heat exchange between do.

As the compressed air is cooled by the cooling unit, water contained in the compressed air is condensed and drain is generated. In addition, as the compressed air containing the drain rises in the drain separation section, the drain drops due to gravity and is separated from the compressed air. As a result, the compressed air from which the drainage has been removed flows out from the outlet, so that the amount of drainage flowing out from the heat exchanger to the compressor main body and the supply equipment can be reduced.

The heat exchanger includes a heating unit for exchanging heat between the compressed air flowing in from the inlet and the compressed air flowing toward the outlet to heat the compressed air flowing out from the outlet. good too.

The compressed air from which drain has been separated by the drain separation section after being cooled by the cooling section is in a saturated state. Therefore, when the compressed air flowing out from the outlet of the heat exchanger is cooled, drainage occurs again. According to this configuration, since the compressed air flows out from the outlet after being heated by the heating part, it is possible to suppress the generation of drainage even when the compressed air that has flowed out from the outlet is cooled.

There may be a secondary drain separator connected in the flow of compressed air downstream of the heat exchanger for separating the condensate from the compressed air.

The compressed air from which drain has been separated by the drain separation section after being cooled by the cooling section is in a saturated state. Therefore, when the compressed air flowing out from the outlet of the heat exchanger is cooled, drainage occurs again. According to this configuration, even if drainage occurs downstream of the heat exchanger in the flow of compressed air, the secondary drainage separator separates the drainage from the compressed air. Therefore, it is possible to prevent the drain together with the compressed air from flowing out to the downstream side of the secondary drain separator in the flow of the compressed air.

The secondary drain separator includes a truncated cone-shaped body that widens upward, an exhaust pipe provided in the upper part of the body for discharging the compressed air, and a lower part of the body that discharges the drain. A secondary drain storage portion for storing the secondary drain water, and a partition plate provided between the exhaust pipe and the secondary drain storage portion and having a plurality of openings may be provided.

According to this configuration, since the partition plate having a plurality of openings is provided between the exhaust pipe and the secondary drain reservoir, the drain stored in the secondary drain reservoir flows into the secondary drain separator. It is possible to prevent the exhaust pipe from being blown up by the compressed air that has flowed into the exhaust pipe and flowing out together with the compressed air from the exhaust pipe. On the other hand, since the partition plate is provided with a plurality of openings, the drain separated from the compressed air is stored in the secondary drain storage through the openings.

A channel cross-sectional area of the drain separating portion may be larger than a channel cross-sectional area of an air channel in the cooling portion through which the compressed air flows.

The slower the flow velocity of the compressed air rising in the drain separation section, the easier it is for the drain to drop due to gravity, and the easier the drain is to be separated from the compressed air. According to this configuration, since the channel cross-sectional area of the drain separation portion is larger than the channel cross-sectional area of the air channel of the cooling portion, the compressed air is decelerated when flowing from the cooling portion to the drain separation portion. As a result, the flow velocity of the compressed air decreases in the drain separating section, so that the amount of drain flowing out from the outlet of the heat exchanger can be reduced.

Another aspect of the present invention is gas-liquid heat exchange for cooling the gas by exchanging heat between an inlet through which gas flows in, an outlet through which gas flows out, and the gas flowing in from the inlet and a cooling medium. and a drain separation section that raises the gas that has passed through the gas-liquid heat exchange section and separates drain from the gas.

As the gas is cooled in the gas-liquid heat exchange section, water contained in the gas is condensed and drain is generated. As the gas containing the drain rises in the drain separation section, the drain drops due to gravity and is separated from the gas. As a result, the gas from which the drainage has been removed flows out from the outlet, so that the amount of drainage flowing out from the heat exchanger to the compressor main body and the supply equipment can be reduced.

The heat exchanger may further include a gas heat exchange section that exchanges heat between the air flowing from the inlet and the air flowing toward the outlet.

The compressed air from which drain has been separated by the drain separation section after being cooled by the gas-liquid heat exchange section is in a saturated state. Therefore, when the compressed air flowing out from the outlet of the heat exchanger is cooled, drainage occurs again. According to this configuration, since the compressed air flows out from the outlet after being heated by the heating part, it is possible to suppress the generation of drainage even when the compressed air that has flowed out from the outlet is cooled.

A channel cross-sectional area of the drain separation portion may be larger than a channel cross-sectional area of an air channel through which the air flows in the gas-liquid heat exchange portion.

The slower the flow velocity of the compressed air rising in the drain separation section, the easier it is for the drain to drop due to gravity, and the easier the drain is to be separated from the compressed air. According to this configuration, since the channel cross-sectional area of the drain separation portion is larger than the channel cross-sectional area of the air channel of the gas-liquid heat exchange portion, the compressed air flows from the gas-liquid heat exchange portion to the drain separation portion. slow down. As a result, the flow velocity of the compressed air decreases in the drain separating section, so that the amount of drain flowing out from the outlet of the heat exchanger can be reduced.

ADVANTAGE OF THE INVENTION According to this invention, the drain which flows out to a compressor main body or a supply apparatus from a heat exchanger can be reduced.

1 is a schematic configuration diagram of a compressor according to a first embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS The typical longitudinal cross-sectional view of the heat exchanger which concerns on 1st Embodiment. FIG. 2 is a schematic structural diagram of a secondary drain separator according to the first embodiment; The typical longitudinal cross-sectional view of the heat exchanger which concerns on 2nd Embodiment.

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

[First embodiment]
FIG. 1 is a schematic configuration diagram of a compressor according to the first embodiment.

Referring to FIG. 1, the compressor 1 of this embodiment includes two compressor bodies 10A and 10B, two heat exchangers 20A and 20B, and two secondary drain separators 30A and 30B.

In the following description, when there is no particular need to distinguish between the two compressor bodies 10A and 10B, one of them may be simply referred to as the compressor body 10 in some cases. Moreover, when there is no particular need to distinguish between the heat exchangers 20A and 20B, one of them may be simply referred to as the heat exchanger 20 in some cases. Furthermore, when there is no particular need to distinguish between the secondary drain separators 30A and 30B, one of them may simply be referred to as the secondary drain separator 30 in some cases.

The compressor 1 is an oil-free screw compressor. Further, the compressor 1 of this embodiment is a two-stage compressor that compresses air in stages and discharges it to a supply destination (not shown). In this embodiment, the compressor body 10A is a first-stage compressor body that compresses air to an intermediate pressure, and the compressor body 10B supplies the compressed air discharged from the compressor body 10A to a destination (not shown). ) is the main body of the second-stage compressor that compresses to the discharge pressure of .

A pipe 40 is connected to the suction side of the compressor body 10A. On the other hand, a pipe 41 is connected to the discharge side of the compressor body 10A. The compressor body 10A compresses the air sucked through the pipe 40 and discharges it to the pipe 41 .

A pipe 41 is connected to the suction side of the compressor body 10B. On the other hand, a pipe 42 is connected to the discharge side of the compressor body 10B. The compressor main body 10B is arranged on the discharge side of the compressor main body 10A and is fluidly connected to the compressor main body 10A via a pipe 41 . The compressor body 10B compresses the compressed air sucked through the pipe 41 and discharges it to the pipe 42 .

The heat exchanger 20A is provided in the pipe 41 and is an intercooler as an air cooler that cools the compressed air heated by the heat of compression in the compressor main body 10A. The heat exchanger 20A is arranged downstream of the compressor main body 10A in the flow of compressed air, and is fluidly connected to the compressor main body 10A via piping 41 .

The heat exchanger 20B is an aftercooler as an air cooler that is provided in the pipe 42 and cools the compressed air heated by the heat of compression in the compressor main body 10B. The heat exchanger 20B is arranged downstream of the compressor body 10B in the flow of compressed air and is fluidly connected to the compressor body 10B via piping 42 .

The secondary drain separator 30A is provided in the pipe 41 and separates drain from the compressed air that has passed through the heat exchanger 20A. The secondary drain separator 30A is arranged downstream of the heat exchanger 20A in the flow of compressed air and is fluidly connected to the heat exchanger 20A via piping 41 . On the other hand, the secondary drain separator 30A is arranged upstream of the compressor body 10B in the flow of compressed air, and is fluidly connected to the compressor body 10B via a pipe 41 .

The secondary drain separator 30B is provided in the pipe 42 and separates drain from the compressed air that has passed through the heat exchanger 20B. Secondary drain separator 30B is positioned downstream of heat exchanger 20B in the flow of compressed air and is fluidly connected to heat exchanger 20B via line 42 .

Compressor main bodies 10A and 10B, heat exchangers 20A and 20B, and secondary drain separators 30A and 30B are arranged in this order from the upstream side of the flow of compressed air: compressor main body 10A, heat exchanger 20A, and secondary drain separator 30A. , the compressor body 10B, the heat exchanger 20B, and the secondary drain separator 30B are connected in series in this order.

Air sucked into the compressor main body 10A through the pipe 40 is compressed by the compressor main body 10A and discharged to the pipe 41 . Compressed air discharged from the compressor main body 10A is cooled by the heat exchanger 20A, drained by the secondary drain separator 30A, and then supplied to the compressor main body 10B. Compressed air supplied to the compressor body 10B is compressed by the compressor body 10B and discharged to the pipe 42 . Compressed air discharged from the compressor main body 10B is cooled by the heat exchanger 20B, drained by the secondary drain separator 30B, and then supplied to a supply destination (not shown).

(Heat exchanger)
FIG. 2 is a schematic longitudinal sectional view of the heat exchanger 20. As shown in FIG. In this embodiment, the heat exchanger 20A, which is an intercooler, and the heat exchanger 20B, which is an aftercooler, have the same configuration. In FIG. 2, solid arrows indicate the flow of compressed air, and dotted arrows indicate the flow of cooling water.

Referring to FIG. 2, the heat exchanger 20 comprises an inlet 21 through which compressed air enters and an outlet 22 through which compressed air exits. In addition, the heat exchanger 20 passes through a cooling section 23 as a gas-liquid heat exchange section that cools the compressed air by exchanging heat between the compressed air that has flowed in from the inlet 21 and cooling water, and the cooling section 23. and a drain separation section 24 for raising the compressed air and separating the drain from the compressed air. Furthermore, the heat exchanger 20 of the present embodiment includes a heating unit 25 that heats the compressed air flowing out from the outlet 22 by exchanging heat between the compressed air flowing in from the inlet 21 and the compressed air flowing toward the outlet 22. Prepare. In other words, the heat exchanger 20 includes a pre-cooling section for pre-cooling the compressed air flowing from the inlet 21 by exchanging heat between the compressed air flowing from the inlet 21 and the compressed air flowing toward the outlet 22. It can be said that there are Therefore, the heat exchanger 20 has a gas heat exchange section that exchanges heat between the compressed air flowing from the inlet 21 and the compressed air flowing toward the outlet 22 .

The heat exchanger 20 includes a casing 50 , an inlet pipe 60 , an outlet pipe 61 and a cooling pipe 62 . In the following description, the direction intersecting the vertical direction (horizontal direction in FIG. 2) in the state where the heat exchanger 20 is installed may be referred to as the horizontal direction.

The casing 50 of this embodiment has a rectangular parallelepiped shape. The casing 50 includes a lower wall 51, an upper wall 52, a first side wall 53, and a second side wall 54 in the cross section shown in FIG. A first partition wall 55 and a second partition wall 56 are provided in the casing 50 . A space in the casing 50 is divided into a cooling section 23 , a drain separation section 24 and a heating section 25 by a first partition wall 55 and a second partition wall 56 . The cooling section 23 and the drain separation section 24 are separated by a first partition wall 55 . The drain separating section 24 and the heating section 25 are separated by a second partition wall 56 .

The lower wall 51 extends laterally in the cross section shown in FIG. The lower wall 51 is provided with a primary drain discharge port 51 a for discharging the drain accumulated in the primary drain storage section 26 provided below the cooling section 23 and the drain separating section 24 .

The upper wall 52 extends laterally in the cross-section shown in FIG. Further, the upper wall 52 and the lower wall 51 are arranged with a gap therebetween in the vertical direction.

The first side wall 53 extends vertically in the cross section shown in FIG. A lower end of the first side wall 53 is connected to an end of the lower wall 51 . The upper end of the first side wall 53 is connected to the end of the upper wall 52 . Further, the first side wall 53 is provided with two insertion openings 53a into which the cooling pipes 62 are inserted. The two insertion openings 53a are arranged with an interval therebetween in the vertical direction.

The second sidewall 54 is laterally spaced apart from the first sidewall 53 . The second side wall 54 extends vertically in the cross section shown in FIG. A lower end of the first side wall 53 is connected to an end of the lower wall 51 . The upper end of the first side wall 53 is connected to the end of the upper wall 52 . In addition, an inlet 21 and an outlet 22 are provided at the lower portion of the second side wall 54 . An introduction pipe 60 is inserted into the inlet 21 . A lead-out pipe 61 is inserted into the outlet 22 .

The first partition wall 55 spatially separates the cooling section 23 and the drain separation section 24 . The first partition wall 55 is laterally spaced apart from the first side wall 53 . The first partition wall 55 extends vertically in the cross section shown in FIG. The lower end of the first partition wall 55 is vertically spaced apart from the lower wall 51 . A top end of the first partition wall 55 is connected to the top wall 52 . The cooling section 23 and the drain separating section 24 are fluidly connected by the communication section 55 a that is the space between the lower end of the first partition wall 55 and the lower wall 51 . An insertion hole 55 b into which the introduction pipe 60 is inserted is provided in the upper portion of the first partition wall 55 . A sealing material (not shown) is provided between the insertion hole 55b and the introduction pipe 60 so that the cooling section 23 and the drain separation section 24 are not fluidly connected via the insertion hole 55b. there is

The second partition wall 56 spatially separates the drain separating section 24 and the heating section 25 . The second partition wall 56 is laterally spaced apart from the second side wall 54 . The second partition wall 56 extends vertically in the cross section shown in FIG. A lower end of the second partition wall 56 is connected to the lower wall 51 . The upper end of the second partition wall 56 is connected to the upper wall 52 . The upper portion of the second partition wall 56 is provided with an insertion hole 56a into which the introduction pipe 60 is inserted. A sealing material (not shown) is provided between the insertion hole 56a and the introduction pipe 60 so that the drain separator 24 and the heating section 25 are not fluidly connected through the insertion hole 56a. there is Further, a communication hole 56 b that fluidly connects the drain separating portion 24 and the heating portion 25 is provided in the upper portion of the second partition wall 56 .

One end of the introduction pipe 60 is connected to a pipe through which the compressed air discharged from the compressor body 10 flows (in this embodiment, the portion of the pipe 41 or the pipe 42 shown in FIG. 1 upstream of the heat exchanger 20). ing. The other end of the introduction pipe 60 is open inside the cooling section 23 . Thereby, the introduction pipe 60 introduces the compressed air discharged from the compressor main body 10 into the cooling section 23 .

The introduction pipe 60 includes a first portion 60a, a second portion 60b, and a third portion 60c.

The first portion 60a is a portion that is inserted into the inlet 21 and extends laterally. One end of the first portion 60a is a pipe through which the compressed air discharged from the compressor body 10 flows (in this embodiment, the portion of the pipe 41 or the pipe 42 shown in FIG. 1 upstream of the heat exchanger 20) and Concatenated. The other end (right end in FIG. 2) of the first portion 60a is located inside the heating section 25 . Compressed air flows laterally (from left to right in FIG. 2) within the first portion 60a.

The second portion 60b is a portion that extends vertically within the heating portion 25 . The lower end of the second portion 60b is connected to the other end of the first portion 60a. Compressed air flows upward through the second portion 60b.

The third portion 60c is a portion extending in the lateral direction so as to straddle the heating portion 25, the drain separation portion 24, and the cooling portion 23. As shown in FIG. That is, one end of the third portion 60c (the left end in FIG. 2) is located inside the heating section 25, and the other end of the third portion 60c (the right end in FIG. 2) is located inside the cooling section 23. Located inside. One end of the third portion 60c is connected to the upper end of the second portion 60b, and the other end of the third portion 60c is open inside the cooling portion 23. As shown in FIG. Compressed air flows laterally (from left to right in FIG. 2) within the third portion 60c.

The outlet pipe 61 is inserted into the outlet 22 and extends laterally. One end of the outlet pipe 61 is connected to a pipe through which cooled compressed air flows (in this embodiment, the portion of the pipe 41 or 42 shown in FIG. 1 downstream of the heat exchanger 20). The other end of the lead-out pipe 61 (the end on the right side in FIG. 2) opens inside the heating section 25 . Thereby, the compressed air cooled by the heat exchanger 20 is supplied to the downstream side of the heat exchanger 20 . Compressed air flows laterally (from the right side to the left side in FIG. 2) in the outlet pipe 61 .

Cooling water flows through the cooling pipe 62 of the present embodiment. The cooling pipe 62 is arranged inside the cooling section 23 and extends vertically inside the cooling section 23 . Cooling water is supplied from a cooling water supply source (not shown) to one end of the cooling pipe 62 (lower end in FIG. 2), flows upward through the cooling pipe 62, It flows out from the other end (upper end in FIG. 2). The cooling water of this embodiment is an example of the cooling medium according to the present invention.

The cooling section 23 is a space defined by a lower wall 51, an upper wall 52, a first side wall 53, and a first partition wall 55 in the cross section shown in FIG. Moreover, the cooling part 23 of this embodiment is a space extending in the vertical direction. Compressed air is introduced into the cooling unit 23 through an introduction pipe 60 . The compressed air introduced into the cooling unit 23 is cooled by exchanging heat with the cooling water flowing through the cooling pipe 62 while flowing downward through the cooling unit 23 . At this time, as the compressed air is cooled, water contained in the compressed air is condensed and drain is generated.

The drain separating portion 24 is a space defined by a lower wall 51, an upper wall 52, a first partition wall 55, and a second partition wall 56 in the cross section shown in FIG. Also, the drain separating portion 24 of the present embodiment is a space extending in the vertical direction. Compressed air accompanied by drain is introduced from the cooling part 23 into the drain separation part 24 through the gap between the lower wall 51 and the lower end of the first partition wall 55 . The compressed air introduced into the drain separation section 24 flows upward through the drain separation section 24 . At this time, the drain drops due to gravity and is separated from the compressed air. The separated drain is stored in the primary drain reservoir 26 and discharged from the primary drain outlet 51a.

As described above, the compressed air flows downward through the cooling section 23 and upward through the drain separation section 24 . That is, the direction in which the compressed air flows in the cooling section 23 is opposite to the direction in which the compressed air flows in the drain separating section 24 . Specifically, the compressed air flows downward in the cooling section 23 and collides with the lower wall 51, and then flows laterally (from the right side to the left side in FIG. 2) to the second partition. It collides with the wall 56 and flows through the drain separator 24 from the bottom to the top. As the compressed air collides with the lower wall 51 and the second partition wall 56 in this way, the drain contained in the compressed air is easily separated.

The flow channel cross-sectional area A1 of the drain separation portion 24 of the present embodiment is substantially the same as the flow channel cross-sectional area A2 of the cooling portion 23 . It is preferable that the channel cross-sectional area A1 of the drain separation portion 24 is four times or more and six times or less the channel cross-sectional area A2 of the cooling portion 23 . The channel cross-sectional area A1 of the drain separation portion 24 is the opening area of the drain separation portion 24 in a cross section perpendicular to the direction in which the compressed air flows. Similarly, the channel cross-sectional area A2 of the cooling unit 23 is the channel cross-sectional area of the air channel through which the compressed air flows in the cooling unit 23. area. Further, in the present embodiment, the flow path cross-sectional area A1 of the drain separation portion 24 is substantially constant along the flow of the compressed air inside the drain separation portion 24 . Similarly, the flow passage cross-sectional area A2 of the cooling section 23 is generally constant along the flow of the compressed air within the cooling section 23 .

The heating section 25 is a space defined by a lower wall 51, an upper wall 52, a second side wall 54, and a second partition wall 56 in the cross section shown in FIG. Moreover, the heating part 25 of this embodiment is a space extending in the vertical direction. Compressed air from which the drain is separated from the drain separating portion 24 is introduced into the heating portion 25 via the communication hole 56 b of the second partition wall 56 . Compressed air introduced into the heating unit 25 is in a saturated state. The compressed air introduced into the heating unit 25 exchanges heat with the compressed air flowing through the introduction pipe 60 (especially the second portion 60b) while flowing downward through the heating unit 25, thereby heating the air. be done. On the other hand, the compressed air flowing through the introduction pipe 60 is cooled. Compressed air heated by the heating unit 25 is supplied to the downstream side of the heat exchanger 20 via the outlet 22 .

(secondary drain separator)
FIG. 3 is a schematic configuration diagram of the secondary drain separator 30. As shown in FIG.

The secondary drain separator 30 includes a truncated cone-shaped main body 31 that widens upward, an exhaust pipe 32 provided in the upper part of the main body 31, and a secondary drain reservoir 33 provided in the lower part of the main body 31. , and a punching metal 34 provided between the exhaust pipe 32 and the secondary drain reservoir 33 .

The exhaust pipe 32 is provided coaxially with the main body 31 . The maximum diameter D2 of the main body 31 of this embodiment is two to three times the diameter D1 of the exhaust pipe 32 .

The punching metal 34 of this embodiment is a metal plate provided with a plurality of openings 34a. The punching metal 34 of this embodiment is an example of the partition plate according to the present invention.

Compressed air introduced from an inlet 31 a provided in the upper portion of the main body 31 flows downward while swirling in the space between the main body 31 and the exhaust pipe 32 . As the compressed air swirls, the drain accompanying the compressed air is separated from the compressed air by centrifugal force. The compressed air from which the drain has been separated is supplied to the downstream side of the secondary drain separator 30 via the exhaust pipe 32 .

On the other hand, the drain separated from the compressed air flows downward along the inner peripheral surface of the main body 31 and is stored in the secondary drain reservoir 33 through the openings 34 a of the punching metal 34 .

The compressor 1 of this embodiment has the following functions.

As the compressed air is cooled by the cooling unit 23, moisture contained in the compressed air is condensed and drain is generated. In addition, as the compressed air containing the drain rises in the drain separation section 24, the drain drops due to gravity and is separated from the compressed air. As a result, the compressed air from which the drainage has been removed flows out from the outlet 22, so that the amount of drainage flowing out of the heat exchanger 20 can be reduced.

The compressed air from which the drain is separated by the drain separation unit 24 after being cooled by the cooling unit 23 is in a saturated state. Therefore, when the compressed air flowing out from the outlet 22 of the heat exchanger 20 is cooled (when the temperature is lowered), drainage occurs again. On the other hand, in the present embodiment, the compressed air flows out from the outlet 22 after being heated by the heating unit 25, so even if the compressed air flowing out from the outlet 22 is cooled, the generation of drainage can be suppressed. .

The compressed air from which the drain is separated by the drain separation unit 24 after being cooled by the cooling unit 23 is in a saturated state. Therefore, when the compressed air flowing out from the outlet 22 of the heat exchanger 20 is cooled (when the temperature is lowered), drainage occurs again. In this embodiment, even if drainage occurs downstream of the heat exchanger 20 in the flow of compressed air, the secondary drainage separator 30 separates the drainage from the compressed air. Therefore, it is possible to suppress the drain together with the compressed air from flowing out to the downstream side of the secondary drain separator 30 in the flow of the compressed air.

In this embodiment, a punching metal 34 having a plurality of openings 34a is provided between the exhaust pipe 32 and the secondary drain reservoir 33 . Therefore, it is possible to prevent the drain stored in the secondary drain storage portion 33 from being swirled up by the compressed air that has flowed into the secondary drain separator 30 and flowing out from the exhaust pipe 32 together with the compressed air. On the other hand, since the punching metal 34 is provided with a plurality of openings 34a, the drain separated from the compressed air is stored in the secondary drain storing portion 33 through the openings 34a.

The slower the flow rate of the compressed air rising in the drain separation section 24, the easier it is for the drain to drop due to gravity, and the easier it is for the drain to be separated from the compressed air. In the present embodiment, since the channel cross-sectional area A1 of the drain separation section 24 is larger than the channel cross-sectional area A2 of the cooling section 23, the compressed air is decelerated when flowing from the cooling section 23 to the drain separation section 24. FIG. Therefore, since the flow velocity of the compressed air decreases in the drain separating section 24, the amount of drain flowing out from the outlet 22 of the heat exchanger 20 can be reduced.

[Second embodiment]
The heat exchanger 120 according to the second embodiment will be described below with reference to FIG. The compressor 1 of the second embodiment has the same configuration as the compressor 1 of the first embodiment except for the configuration of the heat exchanger 120, and FIGS. 1 and 3 are used. In the second embodiment, the same reference numerals are given to the same configurations as in the first embodiment. In this embodiment, the heat exchanger 20A as the intercooler shown in FIG. 1 and the heat exchanger 20B as the aftercooler are configured with the heat exchanger 120 shown in FIG.

FIG. 4 is a diagram for explaining the main part of this embodiment, and is a schematic longitudinal sectional view of the heat exchanger 120. As shown in FIG. In FIG. 4, solid arrows indicate the flow of compressed air, and dotted arrows indicate the flow of cooling liquid (cooling water in this embodiment). Further, in the following description, the direction (horizontal direction in FIG. 4) intersecting with the vertical direction in the state where the heat exchanger 120 is installed may be referred to as the lateral direction.

Referring to FIG. 4, the heat exchanger 120 comprises an inlet 121 through which compressed air flows and an outlet 122 through which compressed air flows out. In addition, the heat exchanger 120 passes through a cooling section 123 as a gas-liquid heat exchange section that cools the compressed air by exchanging heat between the compressed air and the cooling water that flowed in from the inlet 121, and the cooling section 123. and a drain separator 124 for raising the compressed air and separating the drain from the compressed air. Furthermore, the heat exchanger 120 of the present embodiment has a heating unit 125 that heats the compressed air flowing out from the outlet 122 by exchanging heat between the compressed air flowing in from the inlet 121 and the compressed air flowing toward the outlet 122. Prepare. In other words, the heat exchanger 120 includes a pre-cooling section for pre-cooling the compressed air flowing from the inlet 121 by exchanging heat between the compressed air flowing from the inlet 121 and the compressed air flowing toward the outlet 122 . It can be said that there are Therefore, the heat exchanger 120 has a gas heat exchange section that exchanges heat between the compressed air flowing from the inlet 121 and the compressed air flowing toward the outlet 122 .

The heat exchanger 120 of this embodiment is a plate heat exchanger. The heat exchanger 120 includes a plurality of (thirteen in this embodiment) plates 150A-150M. In the following description, one of the plates 150A to 150M may simply be referred to as plate 150 when there is no particular need to distinguish between them.

The plate 150 extends vertically in the cross section shown in FIG. Heat exchanger 120 is configured by laterally stacking plates 150A to 150M. In addition, the plates 150A to 150M, except for the plate 150K, are provided with spaces for the flow of compressed air or coolant.

The upper side surface of heat exchanger 120 is formed by the upper ends of plates 150A-150M.

The lower side surface of heat exchanger 120 is formed by the lower ends of plates 150A-150M. At the bottom of the plate 150F, there is a primary drain outlet 151 for discharging the drain accumulated in the primary drain reservoir 126 provided under the part of the cooling part 123 (the part through which the air flows) and the drain separation part 124. is provided.

One lateral side surface of the heat exchanger 120 is configured by a plate 150A. An inlet 121 through which compressed air flows and an outlet 122 through which compressed air flows out are provided at the bottom of the plate 150A.

The inlet 121 is fluidly connected to a pipe through which the compressed air discharged from the compressor body 10 flows (in this embodiment, the portion of the pipe 41 or the pipe 42 shown in FIG. 1 upstream of the heat exchanger 20). ing. Thereby, the compressed air discharged from the compressor main body 10 is introduced into the heat exchanger 120 .

The outlet 122 is fluidly connected to a pipe through which cooled compressed air flows (in this embodiment, the portion of the pipe 41 or the pipe 42 shown in FIG. 1 on the downstream side of the heat exchanger 20). Thereby, the compressed air cooled by heat exchanger 120 is supplied to the downstream side of heat exchanger 120 .

The other lateral side of the heat exchanger 120 is formed by a plate 150M. The plate 150M is provided with an inlet 152 through which cooling water (cooling medium) flows and an outlet 153 through which the cooling water flows out. The inflow port 152 and the outflow port 153 are arranged with a space therebetween in the vertical direction. The inflow port 152 is provided below the outflow port 153 .

An air channel 160 and a cooling water channel 161 are formed in the heat exchanger 120 of this embodiment.

The air flow path 160 includes a first portion 160a, a second portion 160b, a third portion 160c, a fourth portion 160d and a fifth portion 160e.

The first portion 160a is the space defined by the plates 150A-150C in the cross section shown in FIG. The first portion 160a extends vertically in the cross section shown in FIG. Also, the first portion 160 a communicates with the inlet 121 . Compressed air that has flowed in from the inlet 121 flows upward through the first portion 160a.

The second portion 160b is the space defined by the plates 150I-150K in the cross section shown in FIG. The second portion 160b extends vertically in the cross section shown in FIG. Also, the second portion 160b is adjacent to the cooling water flow path 161 via the plate 150K. The second portion 160b communicates with the first portion 160a. Compressed air that has passed through the first portion 160a flows downward through the second portion 160b.

The third portion 160c is the space defined by the plates 150G-150I in the cross section shown in FIG. The third portion 160c extends vertically in the cross section shown in FIG. Also, the third portion 160c is fluidly connected to the second portion 160b by a communicating portion 154, which is a space provided in the lower portion of the plate 150I. Part of the compressed air that has passed through the second portion 160b flows into the third portion 160c via the communicating portion 154, and flows upward through the third portion 160c.

The fourth portion 160d is the space defined by the plates 150E-150G in the cross section shown in FIG. The fourth portion 160d extends vertically in the cross section shown in FIG. Further, the fourth portion 160d is fluidly connected to the third portion 160c by a communicating portion 155, which is a space provided under the plate 150G. Part of the compressed air that has passed through the second portion 160b flows into the fourth portion 160d via the communication portion 154 and the communication portion 155, and flows upward through the fourth portion 160d. That is, the compressed air that has passed through the second portion 160b branches and flows through the third portion 160c and the fourth portion 160d.

The fifth portion 160e is the space defined by the plates 150C-150E in the cross section shown in FIG. The fifth portion 160e extends vertically in the cross section shown in FIG. Also, the fifth portion 160e is adjacent to the first portion 160a via the plate 150C. The fifth portion 160e is fluidly connected to the fourth portion 160d by a communicating portion 156, which is a space provided above the plate 150E. Also. The fifth portion 160e is fluidly connected to the third portion 160c by a communicating portion 156 and a communicating portion 157, which is a space provided above the plate 150G. Also, the fifth portion 160 e communicates with the outlet 122 . The compressed air that has passed through the third portion 160c and the compressed air that has passed through the fourth portion 160d join together to flow into the fifth portion 160e, flow downward through the fifth portion 160e, and exit the outlet 122. leak.

Cooling water flows in the cooling water flow path 161 . The cooling water flow path 161 is a space defined by the plates 150K to 150M in the cross section shown in FIG. The cooling water flow path 161 extends vertically in FIG. Cooling water is supplied from a cooling water supply source (not shown) through an inlet 152 to one end (lower end in FIG. 4) of the cooling water flow path 161, and flows through the cooling water flow path 161 from the bottom to the top. It flows toward the cooling water flow path 161 and flows out from the other end (upper end in FIG. 4) of the cooling water flow path 161 through the outlet 153 . The cooling water of this embodiment is an example of the cooling medium according to the present invention.

The cooling portion 123 of the present embodiment is composed of the second portion 160 b of the air flow path 160 and the cooling water flow path 161 . In the cooling part 123, the compressed air is cooled by exchanging heat with the cooling water flowing in the cooling water flow path 161 via the plate 150K while flowing downward in the second part 160b. . At this time, as the compressed air is cooled, water contained in the compressed air is condensed and drain is generated.

The drain separator 124 of this embodiment is composed of a third portion 160c and a fourth portion 160d of the air flow path 160. As shown in FIG. Compressed air accompanied by drain is introduced from the cooling section 123 (more specifically, the second portion 160 b of the air flow path 160 ) to the drain separating section 124 via the communicating section 154 . The compressed air introduced into the drain separation section 124 flows upward through the drain separation section 124 . At this time, the drain drops due to gravity and is separated from the compressed air. The separated drain is stored in the primary drain reservoir 126 and is discharged from the primary drain outlet 151 by opening a drain discharge valve (not shown) in a timely manner.

As described above, the compressed air flows downward through the cooling section 123 (more specifically, the second portion 160b of the air flow path 160) and upward through the drain separation section 124. As shown in FIG. That is, the direction in which the compressed air flows in the cooling section 123 is opposite to the direction in which the compressed air flows in the drain separating section 124 . Specifically, the compressed air flows downward through the cooling portion 123 (more specifically, the second portion 160b of the air flow path 160) to the lower side surface of the heat exchanger 120 (more specifically, the second portion 160b of the air flow path 160). , the lower end of the plate 150J), then flows laterally (from right to left in FIG. 4), collides with the plate 150E, and flows through the drain separator 124 from below to above. As the compressed air collides with the lower end of the plate 150J and the plate 150E in this manner, the drain contained in the compressed air is easily separated.

The channel cross-sectional area A1 of the drain separating portion 124 is larger than the channel cross-sectional area A2 of the air channel of the cooling portion 123 (that is, the second portion 160b). It is preferable that the channel cross-sectional area A1 of the drain separation part 124 is four times or more and six times or less the channel cross-sectional area A2 of the air channel of the cooling part 123 . The channel cross-sectional area A1 of the drain separating portion 124 is the opening area of the drain separating portion 124 in a cross section perpendicular to the direction in which the compressed air flows. More specifically, the channel cross-sectional area A1 of the drain separation portion 124 of the present embodiment is the sum of the opening area of the third portion 160c and the opening area of the fourth portion 160d in a cross section orthogonal to the direction in which the compressed air flows. It is the total. Similarly, the channel cross-sectional area A2 of the air channel of the cooling unit 123 is the channel cross-sectional area of the air channel through which the compressed air flows in the cooling unit 123. 2 is the opening area of the portion 160b. Further, in the present embodiment, the flow path cross-sectional area A1 of the drain separation section 124 is generally constant along the flow of the compressed air inside the drain separation section 124 . Similarly, the channel cross-sectional area A2 of the air channel of the cooling part 123 is generally constant along the flow of the compressed air in the air channel of the cooling part 123 .

The heating section 125 of this embodiment is composed of a first portion 160a and a fifth portion 160e of the air flow path 160. As shown in FIG. Compressed air from which the drain is separated from the drain separating portion 124 is introduced into the fifth portion 160 e via the communicating portion 156 . The compressed air introduced into the fifth portion 160e forming part of the heating portion 125 is saturated. The compressed air introduced into the fifth portion 160e, which constitutes part of the heating section 125, exchanges heat with the compressed air flowing through the first portion 160a while flowing downward through the fifth portion 160e. is thus heated. Meanwhile, the compressed air flowing within the first portion 160a is cooled. Compressed air heated by the heating unit 125 is supplied to the downstream side of the heat exchanger 120 via the outlet 122 .

The compressor 1 of the second embodiment has functions similar to those of the compressor 1 of the first embodiment.

As described above, specific embodiments and modifications thereof of the present invention have been described, but the present invention is not limited to the above embodiments, and various changes can be made within the scope of the present invention.

The compressor 1 of the above-described embodiment is a two-stage compressor including a compressor main body 10A that is a first-stage compressor main body and a compressor main body 10B that is a second-stage compressor main body, but is limited to this. not. That is, the compressor 1 may be a single-stage compressor composed of one compressor main body 10 or a multi-stage compressor composed of three or more compressor main bodies 10 .

In the above embodiment, the heat exchanger 20A as the intercooler and the heat exchanger 20B as the aftercooler have the same configuration, but the configuration is not limited to this. That is, either the intercooler or the aftercooler may be the heat exchanger 20 of the present invention.

Also, the secondary drain separator 30 may not necessarily be provided.

In the first embodiment, the flow channel cross-sectional area (A1) of the drain separation portion 24, which is the flow channel cross-sectional area for the vertical flow of the compressed air, and the flow channel cross-sectional area (A2) of the air flow channel of the cooling portion 23 are generally the same, but are not limited to this and may not be the same. That is, as shown in the second embodiment, the channel cross-sectional area (A1) of the drain separating portion 124 and the channel cross-sectional area (A2) of the air channel of the cooling portion 123 may be different from each other. In this case, the flow passage cross-sectional area (A1) of the drain separating portions 24 and 124 and the flow passage cross-sectional area (A2) of the air flow passages of the cooling portions 23 and 123 according to the present invention correspond to the compression in the respective flow passages. It is the minimum channel cross-sectional area for vertical air flow. In this case, the minimum channel cross-sectional area of the drain separating section 24 is preferably six times the minimum channel cross-sectional area in the cooling section 23 at maximum. In addition, when the air flow path of the drain separation section 24, 124 or the cooling section 23, 123 branches into a plurality of parts in the middle of the air flow path from the inlet 21, 121 of the heat exchanger 20 to the outlet 22, 122. , the minimum channel cross-sectional area means the sum of the cross-sectional areas of the branched air channels.

1 Compressor 10, 10A, 10B Compressor Main Body 20, 20A, 20B Heat Exchanger 21 Inlet 22 Outlet 23 Cooling Section 24 Drain Separating Section 25 Heating Section 26 Primary Drain Storage Section 30, 30A, 30B Secondary Drain Separator 31 Main Body 31a Inflow port 32 Exhaust pipe 33 Secondary drain reservoir 34 Punching metal (partition plate)
34a opening 40, 41, 42 piping 50 casing 51 lower wall 51a primary drain outlet 52 upper wall 53 first side wall 53a insertion port 54 second side wall 55 first partition wall 55a communicating portion 55b insertion hole 56 second partition wall 56a insertion hole 56b communication hole 60 introduction pipe 60a first portion 60b second portion 60c third portion 61 lead-out pipe 62 cooling pipe 120 heat exchanger 121 inlet 122 outlet 123 cooling section 124 drain separation section 125 heating section 126 primary drain storage section 150, 150A to 150M Plate 151 Primary drain outlet 152 Inlet 153 Outlet 154 Communicating portion 155 Communicating portion 156 Communicating portion 157 Communicating portion 160 Air flow path 160a First portion 160b Second portion 160c Third portion 160d Fourth portion 160e Fifth Part 161 Cooling water flow path

Claims (8)

a compressor body that compresses and discharges air;
a heat exchanger connected downstream of the compressor body in the flow of compressed air discharged from the compressor body and exchanging heat between the compressed air and a cooling medium;
The heat exchanger is
an inlet into which the compressed air flows;
an outlet through which the compressed air flows;
a cooling unit for exchanging heat between the compressed air flowing in from the inlet and the cooling medium to cool the compressed air;
A compressor comprising: a drain separation section that raises the compressed air that has passed through the cooling section and separates drain from the compressed air. The heat exchanger includes a heating unit for exchanging heat between the compressed air flowing in from the inlet and the compressed air flowing toward the outlet to heat the compressed air flowing out from the outlet. A compressor according to claim 1 . 3. A compressor according to claim 1 or 2, comprising a secondary drain separator connected in the flow of compressed air downstream of the heat exchanger to separate the condensate from the compressed air. The secondary drain separator,
a frustum-shaped body that widens upward;
an exhaust pipe provided on the upper part of the main body for discharging the compressed air;
a secondary drain storage part provided in the lower part of the main body for storing the drain;
The compressor according to claim 3, further comprising: a partition plate provided between the exhaust pipe and the secondary drain reservoir and having a plurality of openings. The compressor according to any one of claims 1 to 4, wherein a channel cross-sectional area of said drain separating portion is larger than a channel cross-sectional area of an air channel in said cooling portion through which said compressed air flows. an inlet through which air flows;
an outlet through which air flows out;
a gas-liquid heat exchange unit for exchanging heat between the air flowing in from the inlet and a cooling medium to cool the air;
A heat exchanger, comprising: a drain separation section that raises the air that has passed through the gas-liquid heat exchange section and separates drain from the air. 7. The heat exchanger according to claim 6, further comprising a gas heat exchange section that exchanges heat between the air flowing in from the inlet and the air flowing toward the outlet. 8. The heat exchanger according to claim 6, wherein the channel cross-sectional area of the drain separation portion is wider than the channel cross-sectional area of the air channel through which the air flows in the gas-liquid heat exchange portion.

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