JP6204870B2 - Gas cooler - Google Patents

Description

  The present invention relates to a gas cooler.

  Patent Document 1 discloses a screw compressor having a compressor body, an intercooler that cools compressed air compressed by the compressor body, and a drain separator that separates droplets condensed in the compressed air by cooling with the intercooler. Is disclosed.

  In this screw compressor, the drain separator is constituted by a droplet primary separation means and a droplet secondary separation means. The primary separator of the drain separator is connected to the outlet of the intercooler, and the secondary separator is connected to the downstream side of the primary separator. On the downstream side of the droplet secondary separation means, a lead-out tube for leading the compressed air that has separated the droplets is further connected.

  In the droplet primary separation means, the compressed air introduced in the horizontal direction collides with a wall surface substantially perpendicular to the flow. Thereby, the droplets in the compressed air are primarily separated.

  In the droplet secondary separation means, the droplet primary separation means collides with the wall surface, and then the compressed air introduced upward in the vertical direction collides with the wall surface substantially perpendicular to the flow. Thereby, the droplets in the compressed air are secondarily separated.

  In the screw compressor, the drain separator is configured so that droplets that could not be separated by the droplet primary separation means can be separated by the droplet secondary separation means, thereby improving the droplet separation performance.

  However, in the configuration in which the drain separator having the droplet primary separation means and the droplet secondary separation means is provided outside like the screw compressor, the piping structure becomes complicated, so that the assemblability is poor. Moreover, since a some connection part is required, the risk of producing the performance fall by gas leakage increases.

JP 2004-68658 A

  It is an object of the present invention to improve the assemblability and prevent performance degradation due to gas leakage.

  The gas cooler of the present invention is provided on the bottom wall portion side of the side wall portion, a casing having a bottom wall portion and a side wall portion rising from the bottom wall portion, an inlet for introducing gas into the casing, A lead-out port through which the gas is led out from the inside of the casing, a cooling unit that is accommodated in the casing and cools the gas, and is provided in the bottom wall portion so that at least a part is adjacent to the lead-out port, Disposed above the drain recovery part so as to extend in a direction intersecting with the drain recovery part for recovering drain water in which moisture in the gas is condensed by cooling by the cooling part and the side wall part provided with the outlet port A blow-up prevention unit.

  According to this configuration, the gas introduced from the inlet is cooled by the cooling unit, and the moisture in the gas is condensed and becomes drain water and falls to the bottom wall. The drain water falling on the bottom wall is moved along the bottom wall by the gas flow to the outlet, and is collected by the drain collecting unit. Since the blow-up preventing unit is disposed above the drain collecting unit, it is avoided that the drain water collected in the drain collecting unit is blown up by the gas flowing to the outlet and is accompanied by the gas. A drain recovery part is provided inside the gas cooler so as to be adjacent to the outlet, and a drain prevention part for preventing drain water from flowing out to the outside is provided above the drain recovery part, thereby connecting the drain separator pipe outside. Therefore, the assembling property can be improved. Moreover, since the gas cooler has a structure that does not increase the number of external connecting portions, it is possible to avoid an increase in the risk of gas leakage and to prevent performance degradation due to gas leakage.

  The gas cooler of the present invention includes a casing, a cooling unit that is accommodated in the casing and cools the gas, a space that is provided in the cooling unit and through which the gas before passing through the cooling unit circulates, A seal plate that divides the inside of the casing into a space on the bottom side through which the gas after passing through the cooling unit flows, an inlet for introducing the gas into the space on the upper side of the casing, and A lead-out port through which the gas is led out from the space on the bottom side, and provided at the bottom of the casing at a position lower than the lead-out port so that at least a part thereof is adjacent to the lead-out port; A drain recovery part that recovers drain water in which moisture in the gas is condensed, and the outlet and the drain recovery part so as to cover an upper portion of the drain recovery part adjacent to the outlet. There and an upflow preventing portion disposed in adjacent positions.

  According to this configuration, since the blowing-up prevention unit is disposed at a position where the outlet and the drain recovery unit are adjacent so as to cover the upper side of the drain recovery unit adjacent to the outlet, the recovery is performed by the drain recovery unit. It is avoided that the drain water is blown up by the gas flowing to the outlet and is accompanied by the gas. By providing the blow-up preventing portion inside the gas cooler, it is possible to eliminate the necessity of external pipe connection of the drain separator, so that the assemblability can be improved. Moreover, since the gas cooler has a structure that does not increase the number of external connecting portions, it is possible to avoid an increase in the risk of gas leakage and to prevent performance degradation due to gas leakage.

  The drain recovery part is a recess having a drain hole, and is connected to the drain hole and discharges the drain water to the outside, and an electromagnetic valve provided in the discharge part and controlled to be opened and closed by a controller. It is preferable to provide. According to this structure, the drain water collect | recovered by the recessed part of the drain collection | recovery part can be automatically drained from a discharge part by opening a solenoid valve.

  The cooling unit is a heat exchanger having a plurality of cooling water flow paths through which cooling water flows, and the introduction port is disposed above the heat exchanger, and the gas flow is a downward flow. Thus, it is preferable that a gas flow path is provided between the plurality of cooling water flow paths. According to this configuration, the moisture in the gas cooled and condensed by the cooling unit can be easily dropped by the downward flow of the gas passing through the gas flow path.

  The heat exchanger preferably includes a plurality of fins that are disposed in the gas flow path and cool the gas while guiding the flow of the gas in the vertical direction. According to this configuration, the fins are provided in the cooling section so that the gas introduced from the introduction port can easily flow from top to bottom, so that the gas cooling efficiency and drain separation efficiency can be improved. .

  The plurality of cooling water flow paths have straight portions extending from one side in the horizontal direction of the casing toward the other side in the horizontal direction, and the straight portions are composed of a plurality of cooling pipes parallel to each other. The fins are arranged at intervals from one side of the casing in the horizontal direction toward the other side in the horizontal direction, are configured integrally with the cooling pipe, and the introduction port is arranged on the one side in the horizontal direction. The outlet port may be arranged on the other side in the horizontal direction. According to this configuration, the fins are provided in the cooling section so that the gas introduced from the introduction port can easily flow from top to bottom, so that the gas cooling efficiency and drain separation efficiency can be improved. . That is, since there is no gas flow in the shortest route that crosses the cooling portion in an oblique direction from the inlet to the outlet, the gas cooling efficiency and the drain separation efficiency can be improved.

  In the gas cooler of the present invention, it is preferable that the introduction port is opened in such a direction that the gas introduced into the casing flows in a direction once away from the outlet. According to this configuration, it is possible to reduce the amount of gas introduced from the inlet through the shortest route to the outlet, so that more effective gas cooling can be performed.

  It is preferable that the blowing-up prevention unit is a plate provided along the lower end of the outlet. According to this configuration, it is possible to prevent the drain water collected by the drain recovery unit formed on the bottom (bottom) inside the casing with a simple configuration.

  The plate is preferably a punched metal plate. According to this structure, the drain water dripped on the upper surface of the blowing prevention part from the cooling part can be dropped to the drain recovery part.

  According to the present invention, a drain collecting part is provided inside the gas cooler so as to be adjacent to the outlet, and a blow-up preventing part for preventing drain water from flowing out to the outside is provided above the drain collecting part. This eliminates the necessity of connecting the drain separator, so that the assemblability can be improved. Moreover, since the gas cooler has a structure that does not increase the number of external connecting portions, it is possible to avoid an increase in the risk of gas leakage and to prevent performance degradation due to gas leakage.

The top view of the gas cooler concerning this invention. The front side view of the gas cooler concerning this invention. Schematic which shows the positional relationship of the horizontal direction of the inlet, the outlet, and the connection port in the gas cooler of this invention. Schematic of the III-III line cross section shown in FIG. Schematic of the IV-IV line cross section shown in FIG. Schematic of the cross section taken along the line VV shown in FIG. FIG. 1B is a sectional view taken along line VIA-VIA in FIG. 1A. The right view of the casing which removed the attaching part. Schematic which shows the cross section of the insertion direction of a cooling unit. Schematic for demonstrating the several cooling pipe in which the several fin was provided integrally. Sectional drawing of the longitudinal direction of the 1st casing which shows a 1st outlet and a blowing-up prevention member. Sectional drawing of the transversal direction of the 1st casing which shows a 1st outlet and a blowing-up prevention member. Sectional drawing which shows the flow of the gas inside the 1st casing provided with the blowing-up prevention member of this invention. Sectional drawing which shows the flow of the gas inside the 1st casing in which the blowing-up prevention member of this invention is not provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1A and 1B are a plan view and a front side view of a gas cooler 10 according to the present invention, respectively. This gas cooler 10 is incorporated in a compressor in order to cool the compressed air discharged from a compressor main body, for example. The gas cooler 10 of this embodiment has an intercooler (first gas cooler) 20 and an aftercooler (second gas cooler) 50, and is integrally formed in a substantially rectangular parallelepiped shape. Hereinafter, an example in which the gas cooler 10 according to the present invention is incorporated in a screw compressor including an oil-free two-stage screw compressor body will be described. In the screw compressor, the intercooler 20 is provided in the gas path between the low-stage screw compressor and the high-stage screw compressor, and the aftercooler 50 is provided in the gas path downstream of the high-stage screw compressor. It is done.

  As shown in FIGS. 2 to 5, the intercooler 20 includes a first casing 21 that is formed in a substantially rectangular parallelepiped shape and is open at both ends. The opening of the first casing 21 includes a proximal-side first opening 211 that is a heat exchanger insertion opening and a distal-end-side first opening 212. A portion of the first casing 21 around the proximal end side first opening 211 is a side wall portion 89. A portion of the first casing 21 around the front end side first opening 212 is a side wall portion 90. A first attachment portion 36 to be described later is connected to the side wall portion 89 from the outside. The first casing 21 includes a first top wall portion 22, a first outer wall portion 23, a first inner wall portion 24, and a first bottom wall portion 25. The first outer wall portion 23 and the first inner wall portion 24 are each formed so as to rise from the first bottom wall portion 25 and face each other. As shown in FIG. 6B, the first outer wall portion 23 and the first inner wall portion 24 are provided with first support ribs 26 that support a first cooling portion (heat exchanger) 35 described later. .

  The aftercooler 50 includes a second casing 51 that is formed in a substantially rectangular parallelepiped shape and is open at both ends. The opening of the second casing 51 includes a proximal-side second opening 511 that is a heat exchanger insertion opening and a distal-end-side second opening 512. A portion of the second casing 51 around the proximal end side second opening 511 is a side wall portion 89. A portion of the second casing 51 around the distal end side second opening 512 is a side wall portion 90. A second mounting portion 66 described later is connected to the side wall portion 89 from the outside. The second casing 51 includes a second top wall 52, a second outer wall 53, a second inner wall 54, and a second bottom wall 55. The second outer wall portion 53 and the second inner wall portion 54 are formed so as to rise from the second bottom wall portion 55 and face each other. The second outer wall portion 53 and the second inner wall portion 54 are respectively provided with second support ribs 56 for supporting a second cooling portion (heat exchanger) 65 described later.

  The intercooler 20 and the aftercooler 50 are connected via an intermediate portion 80. As shown in FIG. 1A and FIG. 5, a portion of the intermediate portion 80 that connects the first ceiling wall portion 22 of the intercooler 20 and the second ceiling wall portion 52 of the aftercooler 50 is an intermediate ceiling wall portion 81. is there. The first ceiling wall portion 22, the intermediate ceiling wall portion 81, and the second ceiling wall portion 52 are integrally formed to constitute a common ceiling wall portion 84. As shown in FIG. 3, a portion of the intermediate portion 80 that connects the first bottom wall portion 25 of the intercooler 20 and the second bottom wall portion 55 of the aftercooler 50 is an intermediate bottom wall portion 82. The first bottom wall portion 25, the intermediate bottom wall portion 82, and the second bottom wall portion 55 are integrally formed to constitute a common bottom wall portion 85. In the present embodiment, the intermediate portion 80 is integrally formed with the first inner wall portion 24 and the second inner wall portion 54.

  As shown in FIG. 3 and FIG. 6A, a first inlet 27 for introducing gas into the first casing 21 is provided on the first top wall portion 22 side of the first inner wall portion 24 of the intercooler 20. It has been. The first introduction port 27 is arranged on one side in the horizontal direction (longitudinal direction of the first casing 21). The first introduction port 27 is substantially semicircular. As shown in FIG. 1A, the common top wall 84 is provided with an introduction-side first connection port 28 connected to the discharge side of the low-stage screw compressor. The introduction side first connection port 28 is disposed in the intermediate ceiling wall portion 81 located above the first introduction port 27. The intermediate portion 80 is provided with an introduction-side first communication passage 29 that connects the introduction-side first connection port 28 and the first introduction port 27.

  As shown in FIG. 4 and FIG. 6A, a first outlet 31 for leading gas from the inside of the first casing 21 is provided on the first bottom wall 25 side of the first inner wall 24 of the intercooler 20. It has been. The first outlet 31 is disposed on the other side in the horizontal direction, that is, on the opposite side of the first inlet 27 in the longitudinal direction of the first inner wall portion 24. The first outlet 31 is a substantially rectangular opening. The opening lower end of the first outlet 31 is located at substantially the same height as the upper surface of the first bottom wall portion 25 excluding the first drain collecting portion 43 described later. The horizontal length (width) of the first outlet 31 is longer than the vertical length (height). As shown in FIG. 1A, the common top wall portion 84 is provided with a lead-out side first connection port 32 connected to the suction side of the high-stage screw compressor. The lead-out side first connection port 32 is disposed in the intermediate ceiling wall portion 81 located above the first lead-out port 31. The intermediate portion 80 is provided with a derivation-side first communication passage 33 that connects the derivation-side first connection port 32 and the first derivation port 31.

  As shown in FIGS. 1A, 1B, and 6A, the first cooling portion 35 includes a first attachment portion 36 that closes the proximal-end-side first opening 211 of the first casing 21 and maintains airtightness with respect to the opening 211. Is provided. The first attachment portion 36 constitutes a part of the first cooling portion 35 and is attached to the first casing 21. The first mounting portion 36 has a first inflow port 38 for allowing cooling water to flow into the cooling water flow path of the first cooling portion (heat exchanger) 35, and a flow for cooling water to flow out from the cooling water flow path. A proximal cover 93 having a first outflow port 39 is provided. Specifically, the base end side cover 93 is attached to the first attachment portion 36 so as to maintain liquid tightness. The first outflow port 39 is disposed above the first inflow port 38. In addition, the intercooler 20 is provided with a first closing portion 37 that closes the first opening 212 on the front end side of the first casing 21 and maintains airtightness with respect to the opening 212. The first closing portion 37 further includes a sealing function for preventing cooling water from leaking from the cooling water flow path to the inside of the first casing 21 at the front end side of the first cooling portion (heat exchanger) 35. . Further, the first closing portion 37 is provided with a first distal end side cover 94A. Specifically, the first front end side cover 94 </ b> A is attached to the first closing portion 37 so as to maintain liquid tightness.

  The first inflow port 38 is connected to a cooling water supply unit (not shown). The first outflow port 39 is connected to a cooling water drain (not shown). The drainage unit may be connected to the supply unit to form a circulation channel of the intercooler 20.

  As shown in FIGS. 7A and 7B, the first cooling unit 35 is a heat exchanger, and includes a plurality of cooling pipes 40 that constitute a cooling water passage through which cooling water flows to cool the gas. Yes. The cooling water flow path is formed in a meandering shape including a straight portion of the cooling pipe 40 and a folded portion (not shown) provided in the first tip side cover 94A. The cooling pipes 40 in the straight portion are arranged in parallel to each other in a substantially horizontal direction. Therefore, a gas flow path is provided between each cooling pipe (each cooling water channel) 40. As shown to FIG. 6A, the 1st cooling part 35 is accommodated in the 1st casing 21, and is arrange | positioned between the horizontal direction one side and a horizontal direction other side. The first cooling unit 35 is disposed in a range located below the first inlet 27 and above the first outlet 31.

  The starting end opening of each cooling pipe 40 is connected to the first inflow port 38 of the first mounting portion 36. The terminal opening of each cooling pipe 40 is connected to the first outflow port 39 of the first mounting portion 36. As illustrated in FIG. 7B, the first cooling unit 35 (heat exchanger) includes a plurality of fins 41 that are disposed in the gas flow path and cool the gas while inducing the flow of the gas. In the example illustrated in FIG. 7B, the plurality of cooling pipes 40 include a plurality of fins 41 that are integrally provided and extend in the vertical direction. The plurality of fins 41 are disposed at intervals from one side of the first casing 21 toward the other side in the horizontal direction. That is, the 1st cooling part 35 is comprised so that the flow path for guide | inducing a gas to the up-down direction may be formed between the fins 41 and 41 from the horizontal direction one side of the 1st casing 21 to the other horizontal direction side. Yes. As shown in FIGS. 6A and 6B, the first cooling unit 35 is supported by the first support rib 26 of the first casing 21.

  As shown in FIG. 3 and FIG. 6B, the first support rib 26 protrudes inward from the periphery of the base end side first opening 211 of the first casing 21, and the protruding portion is one end side of the first casing 21. To the other side.

  As shown in FIG. 7A, two seal plates 42 are attached to the first cooling unit 35 so as to cover both sides while leaving open portions 87 on the upper and lower sides. The two seal plates 42 are integrated via a pipe-like connecting spacer 86. Each seal plate 42 is formed with a step portion by bending at the upper and lower ends, and a downward step surface 42 </ b> A generated by the lower step portion is supported by the upper surface of the first support rib 26. Thereby, the gap between the stepped surface 42 </ b> A and the upper surface of the first support rib 26 is sealed from one end side of the first casing 21 of the first cooling unit 35 to the other side. That is, the first cooling unit 35 includes an upper space 213 through which the gas before passing through the first cooling unit 35 circulates, and a bottom side space 214 through which the gas after passing through the first cooling unit 35 circulates. Further, a seal plate 42 that partitions the inside of the first casing 21 is provided.

  As shown in FIG. 6A, the first bottom wall portion 25 of the first casing 21 is provided with a first drain recovery portion 43 that recovers drain water in which moisture in the gas is condensed by cooling in the first cooling portion 35. It has been. The first drain collection unit 43 is arranged so that a part thereof is adjacent to the first outlet 31. The 1st drain collection part 43 is a recessed part. A first drain hole 47 communicating with the outside is provided at the bottom of the first drain collecting part 43 (concave part).

  As shown in FIG. 6B, the first drain hole 47 of the gas cooler 10 is provided with a first discharge part 45 that discharges drain water that has flowed into the first drain recovery part 43 to the outside. The first discharge unit 45 is provided with a first electromagnetic valve 46. The opening and closing of the first electromagnetic valve 46 is controlled by a control device (not shown). The first discharge part 45 and the first electromagnetic valve 46 are not shown in the drawings other than FIG. 6B.

  As shown in FIG. 6A, the first inner wall portion 24 is provided with a first blow-up preventing portion 48 that prevents the drain water from blowing up from the first drain collecting portion 43. The first blow-up prevention unit 48 is disposed immediately above the first drain collection unit 43 so as to extend in a direction intersecting with the first inner wall portion 24. The first blow-up prevention unit 48 is disposed on the first inner wall portion 24 so that no inclusions are present between the first blow-up prevention unit 48 and the first drain collection unit 43. The first blow-up preventing portion 48 in the present embodiment is a plate that is provided below the first outlet 31 and extends in a direction orthogonal to the first inner wall portion 24. In the present embodiment, the first blow-up prevention unit 48 is disposed along the lower opening end of the first outlet 31. That is, the 1st blowing prevention part 48 is arrange | positioned in the position which does not block the flow of gas. The width of the first blow-up prevention unit 48 is the same as the width of the first outlet 31. When the distance between the first outer wall portion 23 and the first inner wall portion 24 is D, the length L of the first blow-up preventing portion 48 is 1/3 to 1 / 4D.

  As shown in FIGS. 2 to 4, second introduction ports 57 a and 57 b for introducing gas into the inside of the second casing 51 are provided on the inner surface side of the second top wall portion 52 of the aftercooler 50. The 2nd introduction ports 57a and 57b are arrange | positioned in the approximate center of the horizontal direction (longitudinal direction of the 2nd casing 51). The introduction direction of the second introduction port 57a is the one side in the horizontal direction (the second closing portion 67 side). The introduction direction of the second introduction port 57b is the other side in the horizontal direction (the second attachment portion 66 side). The second introduction ports 57a and 57b are substantially semicircular when viewed from the opened side. As shown in FIG. 1A, the common top wall 84 is provided with an introduction-side second connection port 58 that is connected to the discharge side of the high-stage screw compressor. The introduction-side second connection port 58 is disposed at the center in the longitudinal direction of the second top wall portion 52. Inside the second casing 51, an introduction-side second communication passage 59 that connects the introduction-side second connection port 58 and the second introduction ports 57a and 57b is provided.

  As shown in FIGS. 2 and 4, a second outlet 61 for leading gas from the inside of the second casing 51 is provided on the second bottom wall 55 side of the second outer wall 53 of the aftercooler 50. It has been. The second outlet 61 is disposed on the other side in the horizontal direction (the second attachment portion 66 side). The second outlet 61 is a substantially rectangular opening. The horizontal length (width) of the second outlet 61 is longer than the vertical length (height). The second outlet 61 is provided with a outlet-side second connection 62 connected to a compressed air supply destination (not shown).

  As shown in FIG. 1A, the aftercooler 50 is provided with a second attachment portion 66, a proximal end side cover 93, a second closing portion 67, and a second distal end side cover 94 </ b> B, similarly to the intercooler 20. . The second mounting portion 66 has a second inflow port (not shown) for allowing cooling water to flow into the cooling water passage of the second cooling portion (heat exchanger) 65, and allows the cooling water to flow out from the cooling water passage. The base end side cover 93 provided with the 2nd outflow port 69 for this is provided. Specifically, the base end side cover 93 is attached to the second attachment portion 66 so as to maintain liquid tightness. The second outflow port 69 is disposed above the second inflow port (not shown). Further, the aftercooler 50 is provided with a second closing portion 67 that closes the second opening 512 on the front end side of the second casing 51 and maintains airtightness with respect to the opening 512. The second closing portion 67 further includes a sealing function for preventing the cooling water from leaking from the cooling water flow path to the inside of the second casing 51 at the front end side of the second cooling portion (heat exchanger) 65. . Further, the second closing portion 67 is provided with a second tip side cover 94B. Specifically, the second distal end side cover 94 </ b> B is attached to the second closing portion 67 so as to maintain liquid tightness.

  The second inflow port (not shown) is connected to a cooling water supply unit (not shown). The second outflow port 69 is connected to a cooling water drain (not shown). The drainage unit may be connected to the supply unit to form a circulation channel.

  The second cooling unit 65 attached to the second casing 51 of the aftercooler 50 is configured in the same manner as the first cooling unit 35 attached to the first casing 21 of the intercooler 20. The starting end opening of each cooling pipe (not shown) of the second cooling unit 65 is connected to a second inflow port (not shown) of the second mounting part 66. The terminal opening of each cooling pipe (not shown) of the second cooling unit 65 is connected to the second outflow port 69 of the second attachment unit 66.

  In the example shown in FIG. 1A, the base end side cover 93 attached to the first attachment portion 36 and the second attachment portion 66 is integrally configured. However, the base end side cover 93 may be individually configured to be attached to each of the attachment portions 36 and 66. Further, front end side covers 94A and 94B are individually attached to the first closing portion 37 and the second closing portion 67, respectively. However, the front end side covers 94A and 94B attached to the first closing portion 37 and the second closing portion 67 may be configured integrally.

  Similar to the first drain recovery part 43 shown in FIG. 6A, a second drain recovery part (not shown) is provided on the second bottom wall part 55 of the second casing 51.

  Similar to the first casing 21, the second casing 51 is provided with a second discharge part 75, a second electromagnetic valve 76, and a second drain hole 77.

  The second outer wall portion 53 is provided with a second blowing-up preventing member (not shown), similarly to the first blowing-up preventing portion 48 of the intercooler 20.

  Operation | movement of the gas cooler 10 of this invention which consists of the above structure is demonstrated.

  Gas (compressed air) is sent from the discharge side of the low-stage screw compressor to the introduction side first connection port 28 of the intercooler 20. As shown in FIG. 6A, the gas (compressed air) introduced from the first introduction port 27 through the introduction-side first connection port 28 is introduced into the internal space and sent to the first cooling unit 35 from above. The gas sent to the first cooling unit 35 moves from top to bottom along the fins 41 and 41 as shown in FIG. 7B. At that time, the gas contacts the outer surface of the cooling pipe 40 of the first cooling unit 35 and the fins 41, thereby cooling the gas by exchanging heat with the cooling water inside the cooling pipe 40. Moisture in the cooled gas becomes droplets and falls to the first bottom wall portion 25 through the cooling pipe 40 and the fins 41. In addition, some of the liquid droplets attached to the cooling pipe 40 and the fins 41 are promoted to fall by the gas induced to flow from the top to the bottom. The liquid droplets dropped on the first bottom wall portion 25 become drain water. Then, the drain water obtains a propulsive force from the gas moving along the first bottom wall portion 25 and is sent to the first drain collecting portion 43 below the first blow-up preventing portion 48.

  As shown in FIGS. 8A and 8B, the gas moving along the first bottom wall portion 25 in the intercooler 20 advances along the upper side of the first blow-up preventing portion 48 and flows out from the first outlet 31. To do. The gas flowing out from the first outlet 31 is sent to the suction side of the high-stage screw compressor through the outlet-side first communication passage 33 and the outlet-side first connection port 32. When the gas flows out from the first outlet 31, the gas does not accompany the drain water of the first drain recovery unit 43 as shown in FIG. 9A. That is, the drain water collected in the first drain collection unit 43 is prevented from being blown up from the first drain collection unit 43 to the first outlet 31. In addition, when the 1st blowing prevention part 48 is not provided in the intercooler 20, as shown to FIG. 9B, the drain water of the 1st drain collection | recovery part 43 is blown up to the 1st outlet 31 by gas. That is, the gas flows out from the first outlet 31 with the drain water of the first drain recovery unit 43.

  In the aftercooler 50, gas (compressed air) is introduced from the discharge side of the high-stage screw compressor to the introduction-side second connection port 58. The introduced gas is led out from the second outlet 61 through the second inlets 57a and 57b. The derived gas is sent to the second outlet connection port 62 and supplied to a compressed air supply destination (not shown).

  Since the configuration and operation within the aftercooler 50 are also the same as the configuration and operation within the intercooler 20, description thereof will be omitted.

  According to said structure, the 1st inlet 27 is arrange | positioned above the 1st cooling part 35, the gas introduced from the 1st inlet 27 by providing the fin 41 in the 1st cooling part 35 from the top to the bottom Since it is made easy to flow toward, the gas cooling efficiency and drain separation efficiency can be improved. That is, the gas can be guided so that the flow of the gas introduced from the first introduction port 27 becomes a downward flow, and the gas cooling efficiency and the drain separation efficiency can be improved. In addition, since there is no gas flow in the shortest route that crosses the first cooling part 35 obliquely from the first inlet 27 toward the first outlet 31, gas cooling efficiency and drain separation efficiency can be improved. Can do.

  Since the first cooling unit 35 is disposed below the first introduction port 27 and above the first outlet 31, the gas introduced from the first introduction port 27 is sufficiently supplied by the first cooling unit 35. Can be cooled. In particular, since the first introduction port 27 is arranged on one side in the longitudinal direction of the first casing 21 and the first outlet 31 is arranged on the other side in the horizontal direction, By providing the space 213 and expanding the gas flow path, the flow rate of the gas can be reduced, and the gas can be sufficiently cooled. Therefore, the water in the gas can be sufficiently condensed by the first cooling unit 35, and the water can be sufficiently separated from the gas. Therefore, the gas cooling efficiency and the drain separation efficiency can be improved. Then, the moisture in the gas condensed by the first cooling unit 35 can be easily dropped onto the first bottom wall 25 by the downward flow of the gas passing through the first cooling unit 35. The first inlet 27 is opened in such a direction that the gas introduced into the first casing 21 flows in a direction away from the first outlet 31. Therefore, the amount of gas introduced from the inlet through the shortest route to the outlet can be reduced, and more effective gas cooling can be achieved.

  Moisture that has dropped onto the first bottom wall portion 25, that is, drain water, is adjacent to the first outlet 31 by the gas that moves along the first bottom wall portion 25 and is located below the first blow-up prevention portion 48. It can be moved to the drain collecting part 43. In particular, since the first blow-up prevention unit 48 is disposed on the first inner wall portion 24 so as to be positioned below the first outlet 31 and directly above the first drain collection unit 43, the first drain collection is performed. It is possible to prevent the drain water collected in the portion 43 from being blown up to the first outlet 31 by the flowing gas and accompanying the gas. Therefore, it is possible to avoid drain water from flowing into a device connected to the downstream side of the intercooler 20, that is, a high-stage screw compressor. Therefore, damage to the apparatus (high stage screw compressor) due to drain water inflow can be avoided. In addition, since the gas flow path is formed above the first blow-up prevention section 48 and the drain water flow path is formed below the first blow-up prevention section 48, occurrence of air pressure loss, that is, performance degradation is avoided. it can.

  The drain water collected in the recess of the first drain collection unit 43 can be automatically drained from the first discharge unit 45 by opening the first electromagnetic valve 46.

  Further, it is possible to avoid carrying over the drain water to the compressed air supply destination connected to the downstream side of the aftercooler 50. Accordingly, it is possible to avoid problems at the supply destination of compressed air due to carry over of drain water.

  According to the present invention, the first drain recovery unit 43 is provided in the space 214 on the bottom side inside the gas cooler 10 so as to be adjacent to the first outlet 31, and the drain water is disposed above the first drain recovery unit 43. By providing the first blow-up preventing portion 48 for preventing the outflow to the outside, it is possible to eliminate the necessity of external pipe connection of the drain separator, so that the assemblability can be improved. Moreover, since the gas cooler 10 has a structure that does not increase the number of external connecting portions, it is possible to avoid an increase in the risk of gas leakage and to prevent performance degradation due to gas leakage.

  Furthermore, since the first blow-up preventing portion 48 is provided by a plate, it is possible to prevent the drain water of the first bottom wall portion 25 from being blown up with a simple configuration. An apparatus having a cooling function and a water removal function can be easily configured without providing an independent drain separator outside the gas cooler 10. The number of parts can be reduced, and the cost of the apparatus can be reduced. Since it is possible to eliminate the necessity of providing a drain separator downstream of the gas cooler 10, it is possible to avoid an increase in the pressure loss of the gas flow path and to avoid a decrease in the performance of the screw compressor.

  In addition, the gas cooler 10 of this invention is not limited to the structure of the said embodiment, A various change is possible so that it may illustrate below.

  The first blow-up prevention unit 48 may be formed integrally with the first casing 21 or may be formed separately from the first casing 21.

  The width of the first blow-up prevention unit 48 may be wider than the width of the first outlet 31. Moreover, the length of the 1st blowing prevention part 48 may be longer than the length in the said embodiment, and may be short.

  The first drain collection part 43 may be a planar area on the first bottom wall part 25. That is, the 1st drain collection | recovery part 43 does not need to have a recessed part.

  The first blow-up prevention unit 48 may be a punching metal plate. According to this configuration, the drain water dropped from the first cooling unit 35 onto the upper surface of the first blow-up prevention unit 48 can be dropped to the first drain collection unit 43.

  The first blow-up prevention unit 48 may be a cylindrical member that extends from the peripheral part to above the drain collecting part along the peripheral part of the first outlet 31.

  The first blow-up preventing unit 48 is a cylindrical member or a prism member having a communication hole that closes the first outlet 31 and communicates the space below the first cooling unit 35 and the outlet-side first communication passage 33. May be.

  The gas cooler of the present invention may be a unit in which the single intercooler 20 and the single aftercooler 50 are connected, or only one of the intercooler 20 and the aftercooler 50 may be used.

  In the gas cooler of the present invention, when the introduction port is opened in such a direction that the gas introduced into the casing flows in a direction away from the outlet port, the introduction port is provided in the middle of one end side and the other end side of the casing. Also good.

10 Gas cooler 20 Intercooler (first gas cooler)
21 First casing 211 Base side first opening 212 Tip side first opening 213 Upper side first space 214 Bottom side first space 22 First top wall part 23 First outer wall part 24 First inner wall part 25 First Bottom wall portion 26 First support rib 27 First introduction port 28 Introduction side first connection port 29 Introduction side first communication passage 31 First discharge port 32 Lead-out side first connection port 33 Lead-out side first communication passage 35 First cooling Part (heat exchanger)
36 1st attachment part 37 1st obstruction | occlusion part 38 1st inflow port 39 1st outflow port 40 Cooling pipe (cooling water flow path)
41 Fin 42 Seal plate 43 1st drain collection part 45 1st discharge part 46 1st solenoid valve 47 1st drain hole 48 1st blowing-up prevention part 50 After cooler (2nd gas cooler)
51 Second casing 511 Base end side second opening 512 Front end side second opening 513 Upper side second space 514 Bottom side second space 52 Second ceiling wall portion 53 Second outer wall portion 54 Second inner wall portion 55 Second Bottom wall portion 56 Second support rib 57, 57a, 57b Second introduction port 58 Introduction side second connection port 59 Introduction side second communication passage 61 Second exit port 62 Lead-out side second connection port 65 Second cooling portion (heat Exchange)
66 Second mounting portion 67 Second blocking portion 69 Second outflow port 75 Second discharge portion 76 Second solenoid valve 77 Second drainage hole 80 Middle portion 81 Middle top wall portion 82 Middle bottom wall portion 84 Common top wall portion 85 Common Bottom wall portion 86 Connecting spacer 87 Open portion 89 Side wall portion 90 Side wall portion 93 Base end side cover 94A First front end side cover 94B Second front end side cover

Claims (9)

A casing having a bottom wall part and a side wall part rising from the bottom wall part;
An inlet for introducing gas into the casing;
An outlet port that is provided on the side of the bottom wall portion of the side wall portion and leads out the gas from the inside of the casing;
A cooling unit that is housed in the casing and cools the gas;
A drain recovery unit that is provided on the bottom wall portion so that at least a part thereof is adjacent to the outlet, and recovers drain water in which moisture in the gas is condensed by cooling by the cooling unit;
A gas cooler comprising: a blow-up prevention unit disposed above the drain recovery unit so as to extend in a direction intersecting with the side wall portion provided with the outlet port. A casing,
A cooling unit that is housed in the casing and cools the gas;
The inside of the casing is partitioned into a space on the upper side through which the gas before passing through the cooling unit flows and a space on the bottom side through which the gas after passing through the cooling unit flows. A seal plate;
An inlet for introducing the gas into the space on the upper side of the casing;
An outlet for deriving the gas from the space on the bottom side of the casing;
A drain recovery unit that is provided at the bottom of the casing at a position lower than the outlet so that at least a portion is adjacent to the outlet, and recovers drain water in which moisture in the gas is condensed by cooling by the cooling unit When,
A gas cooler, comprising: a blow-up preventing unit disposed at a position where the outlet and the drain recovery part are adjacent so as to cover an upper part of the drain recovery part adjacent to the outlet. The drain recovery part is a recess having a drain hole,
A discharge part connected to the drain hole and discharging the drain water to the outside;
The gas cooler according to claim 1, further comprising: an electromagnetic valve provided in the discharge unit and controlled to be opened and closed by a control device. The cooling unit is a heat exchanger provided with a plurality of cooling water passages through which cooling water flows.
The inlet is disposed above the heat exchanger;
The gas cooler according to any one of claims 1 to 3, wherein a gas flow path is provided between the plurality of cooling water flow paths so that the gas flow is a downward flow.   5. The gas cooler according to claim 4, wherein the heat exchanger includes a plurality of fins that are disposed in the gas flow path and cool the gas while guiding the flow of the gas in a vertical direction. The plurality of cooling water passages have straight portions extending from one side in the horizontal direction of the casing toward the other side in the horizontal direction, and the straight portions are composed of a plurality of cooling pipes parallel to each other,
The plurality of fins are arranged at an interval from one side in the horizontal direction of the casing toward the other side in the horizontal direction, and are configured integrally with the cooling pipe,
The introduction port is arranged on one side in the horizontal direction,
The gas cooler according to claim 5, wherein the outlet is disposed on the other side in the horizontal direction.   The gas cooler according to any one of claims 1 to 6, wherein the introduction port is opened in a direction in which a gas introduced into the casing flows in a direction in which the gas is once moved away from the outlet port.   The gas cooler according to any one of claims 1 to 7, wherein the blow-up prevention unit is a plate provided along a lower end of the outlet port.   The gas cooler according to claim 8, wherein the plate is a punching metal plate.

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