JP6401591B2 - Multistage compressor cooler and multistage compressor provided with the same - Google Patents

Description

  The present invention relates to a multistage compressor cooler and a multistage compressor including the same.

  As a cooler provided in the compressor, for example, Patent Document 1 is described. In Patent Document 1, a large number of heat radiating tubes 14 and heat radiating plates 15 are arranged between the header plates 13 attached to the inlet tank 11A and the outlet tank 11B, and the inlet tank 11A is connected via the gas inlet 16. A structure of a cooler provided with a plate-type heat exchanger that is cooled by exchanging heat with the outside air via a heat radiating plate 15 when high-temperature compressed air that has entered passes through the heat radiating pipe 14 is disclosed. .

  In Patent Document 2, droplets generated by cooling the compressed air compressed by the low-pressure compressor body 1 by the intercooler 17 fall into the receiving portion 16B1 of the outlet chamber 16B provided in the intercooler header 16. However, a structure including a shell-and-tube heat exchanger that is discharged from the droplet discharge port 16d is disclosed.

Japanese Utility Model Publication No. 62-88190 JP 2004-68658 A

  All of the coolers of Patent Document 2 are shell-and-tube type heat exchangers, and the compressed air is cooled by heat exchange with a cooling medium that circulates inside or outside the tube. Therefore, it is difficult to meet the demand for downsizing of the compressor, and the manufacturing cost and the operating cost are increased. On the other hand, in the structure including the plate-type heat exchanger of Patent Document 1, the cooling of the compressed air is performed by heat exchange with the outside air, so no cooling medium is required, and compared with the shell-and-tube type heat exchanger. Thus, space saving is possible, and operation at a low cost is possible.

  However, in the cooler of Patent Document 1, the heat radiating pipe 14 is joined to the header plate 13 provided at the ends of the inlet tank 11A and the outlet tank 11B, and the inlet tank 11A and the outlet tank 11B are connected to the heat exchange section. It is configured integrally with. For this reason, for example, even when a failure such as a failure occurs in a part of the cooler, it is necessary to repair and replace it integrally, and there is a problem that the repair cost increases.

  Moreover, in the cooler of patent document 1, since the inlet tank 11A and the outlet tank 11B are comprised integrally with the heat exchange part, there is little freedom of choice of material and design freedom, and each according to a usage form. It was difficult to increase the reliability of the part or to reduce the cost.

  Accordingly, an object of the present invention is to provide a multistage compressor cooler that can be manufactured at low cost without impairing the cooling performance and has high reliability, and a multistage compressor using the same.

  As an embodiment of the present invention for solving the above problems, a low pressure side cylinder, a cooler for cooling compressed air compressed in the low pressure side cylinder, and compressed air cooled by the cooler are further compressed. And a cooling means for sending cooling air to the cooler, wherein the cooler includes an inlet portion into which compressed air is introduced from the low pressure side cylinder, and a compression flowed from the inlet portion. A heat exchanger section that cools air with cooling air from the cooling means, and an outlet section that separates droplets contained in compressed air that is cooled by the heat exchanger section and supplied to the high-pressure side cylinder, respectively. It is provided with an independent unit, and the heat exchanger section is detachably fastened to the inlet section and the outlet section via a flange.

  Also, as one embodiment of the present invention, an inlet portion into which compressed air is introduced, a heat exchanger portion that cools the compressed air introduced from the inlet portion by heat exchange with external air, and the heat exchanger And an outlet unit for separating droplets contained in the compressed air cooled by the unit, respectively, and the heat exchanger unit includes a heat radiating plate that radiates heat of the compressed air, and the heat radiating unit. A heat transfer tube penetrating the plate, and the heat exchanger part is detachably fastened to the inlet part and the outlet part via a flange. Use a cooler for the machine.

  ADVANTAGE OF THE INVENTION According to this invention, it can manufacture at low cost, without impairing cooling performance, The cooler for multistage compressors which has high reliability, and a multistage compressor using the same can be implement | achieved.

It is a figure showing the schematic structure of the two-stage compressor concerning an embodiment. It is the schematic for demonstrating the flow of the air in the line containing the low pressure side cylinder and high pressure side cylinder of the two-stage compressor shown in FIG. It is a figure for demonstrating the structure of the conventional cooler. It is an external view for demonstrating the structure of the cooler 30 provided in the multistage compressor which concerns on 1st Embodiment. It is sectional drawing which shows schematic structure of the inlet part 30-1 shown in FIG. It is a side view for demonstrating the structure of the heat exchanger part 30-2 shown in FIG. It is a figure which shows the structure which looked at the exit part 30-3 from the compressed air inflow side and sectional drawing by the BB line in FIG. 8 of the exit part 30-3 shown in FIG. It is a perspective view which shows the state before installing the contact plate 50 in the exit part 30-3. It is a perspective view which shows the external appearance of the contact plate 50 before installing in the exit part 30-3. It is the figure which looked at the state which attached the frame 70 to the cooling unit 30 shown in FIG. 4 from the same direction as FIG. It is the figure which looked at the cooling unit 30 shown to FIG. 10A from the back side of FIG. 10A. 4 is a perspective view showing an example of a structure of a frame attached to the cooler 30. FIG. It is a figure which shows the structure which looked at the exit part 30-3 which made thickness of the box-shaped side center part thick from the A direction of Fig.7 (a). It is sectional drawing which shows the structure of the exit part 80-3 provided in the cooler which concerns on 2nd Embodiment. It is sectional drawing which shows the structure of the exit part 90-3 provided in the cooler which concerns on 3rd Embodiment, and the figure which shows the structure which looked at this cooler from the compressed air inflow side.

  FIG. 1 is a diagram illustrating a schematic configuration of a two-stage compressor according to an embodiment. In the two-stage compressor shown in FIG. 1, a compressor body 3 and a motor 2 for driving the compressor body 3 are arranged on a tank 1, and a compressor pulley 5 is a belt 4 mounted on a motor pulley (not shown). Is rotated. The compressor pulley 5 is fixed with a crankshaft (not shown) connected via a connecting rod to a piston provided in each of a low pressure side cylinder 8 and a high pressure side cylinder 12 described later. The rotation of the crankshaft driven by the rotation is converted into a reciprocating motion by the connecting rod, and the air in the air is sucked from the suction silencer 6 by the reciprocating motion of the piston in each cylinder. It flows from the discharge pipe 7 to the tank 1.

  Note that the low-pressure side cylinder 8 and the high-pressure side cylinder 12 are structures each having a piston, a cylinder that houses the piston, and a cylinder head that closes the upper end of the cylinder.

  In a multi-stage compressor having a plurality of cylinders such as a two-stage compressor, it is necessary to reduce the temperature in the intermediate piping portion in order to improve the compression performance and reduce the temperature of the high-pressure stage. For this reason, an intermediate cooler 10 (hereinafter simply referred to as a cooler 10) is provided between the low pressure side cylinder 8 and the high pressure side cylinder 12. The cooler 10 is installed in an intermediate portion of the compressor, and is supplied with compressed air compressed to an intermediate pressure (hereinafter, abbreviated as an intermediate pressure) in the low pressure side cylinder 8. For this reason, at the time of starting the compressor, the temperature rise in the cooler 10 is slow with respect to the pressure rise in the cooler 10, and compression is performed until the temperature in the cooler 10 rises to the saturated steam temperature with respect to the intermediate pressure. When the air contacts the cooler, water vapor is generated by condensation of water vapor contained in the compressed air. When this water is sucked into the high pressure side cylinder 12, rusting of the high pressure side parts occurs, or in the case of an oil supply type compressor, water drops into the crankcase and is mixed into the lubricating oil. May become an emulsion and whiten the lubricating oil. For this reason, conventionally, a water separation structure is provided on the outlet side of the cooler 10.

  FIG. 2 is a schematic view for explaining the air flow in a line including the low pressure side cylinder 8 and the high pressure side cylinder 12 of the two-stage compressor shown in FIG. Along with the operation of the two-stage compressor, air is sucked from the silencer 6 and compressed to an intermediate pressure in the low pressure side cylinder 8 to become high temperature, and the compressed air is discharged from the discharge pipe 9 of the low pressure side cylinder and flows into the cooler 10.

  The cooler 10 includes a heat exchanger section 10-2 that performs heat exchange of compressed air, an inlet section 10-1 provided on the compressed air inflow side of the heat exchanger section 10-2, and a heat exchanger section 10-. 2 and an outlet portion 10-3 provided on the compressed air outflow side. The heat exchanger unit 10-2 is a plate-type heat exchanger, and is cooled by blowing compressed air from cooling blades provided on the compressor pulley 5 when passing through the heat exchanger unit 10-2. It is cooled by exchanging heat with the wind.

  Condensed water (hereinafter abbreviated as water) generated by condensation in the heat exchanger section 10-2 during operation is separated at the outlet section 10-3 and discharged from the release valve 16. The cooled compressed air from which water has been separated passes through the pipe 11 and is compressed to the final pressure in the high pressure side cylinder 12 and then discharged from the discharge pipe 7 to the tank 1.

  In the two-stage compressor shown in FIGS. 1 to 2, the compressed air is heat-exchanged by the heat exchanger unit 10-2 and cooled to a predetermined temperature by the cooling air from the compressor pulley 5. Therefore, temperature reduction in the high pressure side cylinder 12 is achieved. In addition, since the outlet 10-3 can separate water from the compressed air after cooling, rusting of the high-pressure side cylinder 12 and whitening of the lubricating oil in the crankcase in the oil supply compressor are prevented. . In addition, instead of the cooling air from the compressor pulley 5, a unit that generates cooling air may be arranged at a position facing the heat exchanger section 10-2 to perform cooling.

  Fig.3 (a) is sectional drawing which shows the internal structure of the conventional cooler. FIG.3 (b) is a figure when the cooler shown to Fig.3 (a) is seen from the exit part 10-3 side, The internal structure is shown in the one part.

  The inlet 10-1 has an inlet 21 for introducing compressed air supplied from the low-pressure side cylinder 8 through the pipe 9, and is produced by bending a sheet metal including the end plate 17 and welding the sheet metals together. Yes.

  The outlet part 10-3 is a part for separating droplets contained in the compressed air cooled by the heat exchanger part 10-2. Like the inlet part 10-1, the outlet part 10-3 bends the sheet metal including the end plate 18. It is produced by welding between sheet metals. The outlet 10-3 has a discharge port 22 for supplying the compressed air after cooling to the high-pressure side cylinder 12.

  In the plate-type heat exchanger section 10-2, a plurality of heat radiating plates 14 made of, for example, an aluminum material are disposed in parallel with the end plates 17 and 18. The heat transfer tube 13 is penetrated. The heat transfer tube 13 is made of a copper-based metal material from the viewpoint of heat exchange and rust prevention, and the compressed air inflow side end is brazed to the end plate 17, and the compressed air outflow side end The part is brazed to the end plate 18. Further, in order to prevent an excessive external force from acting on the heat transfer tube 13 and the heat radiating plate 14 at the upper end portion and the lower end portion between the end plates 17 and 18, reinforcement for reinforcing the end plates 17 and 18 in terms of strength. The plates 20 and 20 are welded to the end plates 17 and 18.

  In FIG. 3, the joint parts indicated by * are parts joined by welding or brazing, and the inlet part 10-1, the heat exchanger part 10-2 and the outlet part 10-3 are welded or It is configured as an integral structure by brazing.

  In the cooler 10, the compressed air that has flowed from the inlet 21 spreads the space in the inlet portion 10-1 and flows equally into the heat transfer tubes 13. When the compressed air that has flowed into each heat transfer tube 13 passes through the inside toward the outlet 10-3 side, heat is exchanged with the cooling air from the compressor pulley 5 as described above. The temperature is reduced by dissipating heat. As described above, since the plate-type heat exchanger section 10-2 is cooled by the cooling air from the compressor pulley 5, from the viewpoint of improving the cooling efficiency, the cooling air from the compressor pulley 5 is moved in the traveling direction. It is comprised so that the opposing surface may be ensured widely.

  As the heat transfer tube 13, as shown in the partial cross section of FIG. 3A, a plurality of small single tubes are arranged side by side between the reinforcing plates 20 and 20. By passing compressed air through the heat transfer tube 13 having such a small diameter, the compressed air passes through the tube at a low flow rate, and the water condensed inside the heat transfer tube 13 is aggregated without being scattered again in the tube. It is discharged to the outlet 10-3 as condensed water. As described above, since the plurality of heat transfer tubes 13 are connected to the end plates 17 and 18, the inlet portion 10-1 and the outlet portion 10-3 are configured in a substantially box shape.

  In the cooler 10 shown in FIG. 3, the inlet portion 10-1 and the outlet portion 10-3 are both the same copper-based material as the constituent material of the heat transfer tube 13 in terms of connectivity with the heat transfer tube 13 and rust prevention. It is made of a metal material. For this reason, there existed a problem that the manufacturing cost of the entrance part 10-1 and the exit part 10-3 became expensive.

  In particular, in the case of a large compressor, the outlet portion 10-3 is configured as a large volume box shape in order to cope with an increase in the flow rate flowing through the cooler 10. When such a large-volume outlet portion 10-3 is made of a copper-based metal material, the strength is insufficient, and therefore deformation (swelling) due to pressure during inflow of compressed air and the strength of the welded portion become problems. For this reason, in the case of a cooler for a large compressor, the outlet 10-3 uses an iron-based material in consideration of its strength. In the case of using an iron-based material, rust prevention treatment by plating treatment or painting treatment is performed to prevent corrosion due to contact with water, but these treatments are performed on the inner wall surface of the outlet portion 10-3. For this reason, it is difficult to completely and uniformly carry out plating and painting in every detail, and a sufficient rust prevention effect cannot be obtained. For this reason, there existed the subject of coexistence of strength ensuring and rust prevention when it enlarged.

  In the outlet portion 10-3 of the cooler 10, a contact plate 15 is installed so as to extend in a direction perpendicular to the inflow direction of the compressed air, and water generated in the heat transfer tube 13 flows into the contact plate 15. It collides and grows and is collected in a U-shaped toy 15-1 provided at the lower end of the backing plate 15. The toy 15-1 has a slope that gradually descends toward one end in the width direction, and the water collected in the toy 15-1 travels along the U-shaped portion of the outlet portion 10-3. It falls to the bottom and accumulates, and is discharged from the release valve 16 to the outside.

  The contact plate 15 has a front clearance (I) between the outer wall of the toy 15-1 and the end plate 18, and a lower clearance (II) between the bottom of the toy 15-1 and the bottom of the outlet portion 10-3. The front gap (I) and the lower gap (II) are designed at such an interval that the water separated at the time of the collision with the contact plate 15 is not re-scattered in the outlet portion 10-3. Yes. This prevents the water separated by the contact plate 15 from being sucked into the high pressure cylinder 12. The compressed air from which water has been separated at the outlet 10-3 is discharged from the discharge port 22 toward the pipe 11.

  As shown in FIG. 2, the cooler 10 is connected to the low pressure side cylinder 9 and the high pressure side cylinder 12 by pipes 9 and 11, respectively, but the multistage compressor is only connected by the pipes 9 and 11. In some cases, sufficient strength to withstand vibrations during driving cannot be obtained. For this reason, in the cooler 10 shown to Fig.3 (a), the attaching parts 19-1 to 19-3 are provided in the upper end part of the inlet part 10-1, and the upper end part and side wall of the outlet part 10-3. Yes. These attachment portions 19-1 to 19-3 are configured to be fixed to a belt cover (not shown) provided so as to cover the belt wound around the compressor pulley 5 and the motor pulley of the motor 2.

  Next, the configuration of the cooler 30 provided in the two-stage compressor according to the first embodiment will be described with reference to FIGS. In the following, a configuration different from the cooler 10 shown in FIG. 3 will be described, and the other configuration is assumed to be common to the cooler shown in FIG.

  FIG. 4 is an external view for explaining the structure of the cooler 30 provided in the two-stage compressor according to the first embodiment. The cooler 30 includes an inlet portion 30-1, a heat exchanger portion 30-2, and an outlet portion 30-3, each of which is configured as an independent unit.

  FIG. 6 is a side view for explaining the configuration of the heat exchanger section 30-2 shown in FIG. 4, and partially shows the internal structure thereof. The heat exchanger section 30-2 is provided with flanges 32 and 33 at the inlet side end portion and the outlet side end portion of the compressed air, respectively. Between the flanges 32 and 33, the heat exchanger shown in FIG. Similar to 10-2, a plurality of heat radiating plates 39 made of, for example, an aluminum material are disposed in parallel with the flanges 32 and 33, and a plurality of heat transfer tubes made of a copper-based metal material are disposed on the heat radiating plates 39. 38 is penetrated. Both end portions of the heat transfer tube 38 are brazed to the flanges 32 and 33, respectively, and fixed by welding or tube expansion, and the end portions are sealed.

  FIG. 5 is a cross-sectional view showing a schematic structure of the inlet 30-1 shown in FIG. The inlet 30-1 has a main body 301 and a flange 31, and is configured as a casting in which the main body 301 and the flange 31 are integrally formed by casting. The flange 31 is formed with an O-ring groove 37 for O-ring sealing a fastening portion with the flange 32 of the heat exchanger section 30-2.

  Fig.7 (a) is sectional drawing which shows schematic structure of the exit part 30-3 shown in FIG. Similarly to the inlet portion 30-1, the outlet portion 30-3 has a main body portion 304 and a flange 34, and the main body portion 304 and the flange 34 are configured as a casting integrally formed by casting. . The flange 34 is formed with an O-ring groove 40 for O-ring sealing a fastening portion of the heat exchanger portion 30-2 with the flange 33.

  As shown in FIG. 4, the inlet portion 30-1 and the heat exchanger portion 30-2 are fastened with a flange 31 and a flange 32 by bolts 35, and the outlet portion 30-3 and the heat exchanger portion 30-2. The flange 33 and the flange 34 are fastened by bolts 36. Thereby, the heat exchanger part 30-2 is respectively detachably fixed to the inlet part 30-1 and the outlet part 30-3 via the flanges 31 and 32 and the flanges 33 and 34, respectively. .

  Since the cooler 30 of the present embodiment thus fastens and fixes the inlet portion 30-1, the heat exchanger portion 30-2, and the outlet portion 30-3, respectively, When a malfunction such as a failure occurs in part, it is not necessary to replace the cooler 30 as a single unit, and each can be replaced or repaired individually. For this reason, even when a failure occurs in the cooler 30, it is possible to cope with low cost.

  In the present embodiment, as described above, the inlet portion 30-1, the outlet portion 30-3, and the heat exchanger portion 30-2 are configured as independent units. And the outlet portion 30-3 can be manufactured as independent castings. For this reason, these parts can be manufactured easily and inexpensively. Moreover, since the inlet part 30-1 and the outlet part 30-3 are separate units from the heat exchanger part 30-2 and are configured as independent units, the inlet part 30-1 is described later. And the exit part 30-3 can be comprised with a different material from the heat exchanger part 30-2. That is, since each of the above-described parts can be manufactured using a material and a manufacturing method suitable for each part, it is possible to manufacture inexpensively and efficiently as a whole.

  Moreover, in the cooler 30 of this embodiment, since each part mentioned above is comprised as an independent unit, respectively, size and a shape are ensured so that the function corresponding to the specification of each compressor may be ensured in each. It is possible to configure by combining those appropriately changed according to the specifications of the compressor. For example, when the cooler 30 of the present embodiment is installed in a multistage compressor having the same output as that of the multistage compressor installed at the present stage and a higher pressure (with higher discharge pressure) than this, the compressor 30 is compressed. Since the processing flow rate as a machine is almost the same and there is no change in the required water separation, only the heat exchanger section 30-2 is changed to one with an extended length in the compressed air flow direction. By combining the heat exchanger section 30-2 with the same inlet section 30-1 and outlet section 30-3 as before, the temperature reduction performance is improved corresponding to the high-pressure compressed air, and the water separation performance is not changed. Can be configured, and can be mounted on the high-pressure compressor described above.

  The inlet 30-1 and the outlet 30-3 are made of a casting made of a non-ferrous metal material in order to prevent rusting when contacted with water. As the non-ferrous metal material, for example, by using a copper-based metal material, rusting at the time of contact with water is prevented, and excellent durability is obtained.

  In the cooler of the present embodiment, the inlet 30-1 and the outlet 30-3 are separate from the heat exchanger 30-2 and are configured as independent units. It is also possible to configure only necessary parts such as the heat transfer tube 13 of the vessel section 30-2 with a copper-based metal material, and to configure the inlet section 30-1 and the outlet section 30-3 with a different material.

  For example, the inlet portion 30-1 and the outlet portion 30-3 can be made of an aluminum alloy cast cast using an aluminum cast alloy material. In this case, the surface of the aluminum alloy cast is formed on the surface. For example, a sufficient rust-preventing effect can be obtained by forming an oxide film by anodic oxide film treatment. Moreover, it becomes possible by manufacturing the inlet part 30-1 and the outlet part 30-3 by an aluminum alloy casting compared with the case where it is comprised with a copper-type metal material at low cost. The aluminum casting alloy material can be used without particular limitation as long as it has aluminum as a main component. For example, a material containing copper, silicon, magnesium or the like in addition to aluminum can be used.

  The oxide film formed on the surface of the casting by the anodic oxide coating process grows about half of the film thickness in the outer direction of the casting. A crack or the like may occur in the formed oxide film. For this reason, when an oxide film is formed on the surfaces of the inlet part 30-1 and the outlet part 30-3, a coating process such as resin coating is performed on the oxide film surfaces of the flange part 31 and the flange part 34. Thus, it is possible to eliminate the influence caused by the defects of the film and obtain an excellent rust prevention effect.

  In a wet environment, it is known that when the difference in corrosion potential is large, it reacts as a galvano cell and easily corrodes, and the copper-based metal material and aluminum are a combination that easily corrodes. However, by forming an oxide film on the surface of the aluminum alloy casting and performing a coating process on the oxide film, it is possible to prevent corrosion at the joint with the heat exchanger section 30-2 and to combine inexpensive materials. The cooler 30 can be configured.

  The inlet portion 30-1 and the outlet portion 30-3 may be made of the same material, or may be made of different materials. For example, it is possible to configure only the outlet portion 30-3 with an aluminum alloy casting and configure the inlet portion 30-1 with a copper-based metal material. Similarly, regarding the surface treatment, both the inlet portion 30-1 and the outlet portion 30-3 may be subjected to the same surface treatment, or one of them may be subjected to the surface treatment, or Different surface treatments may be applied to each. Thus, it becomes possible to provide the cooler 30 with high reliability at low cost by appropriately selecting and manufacturing a material and surface treatment suitable for each part.

Next, the internal structure of the outlet portion 30-3 will be described in more detail.
FIG. 8 is a perspective view showing a state before the contact plate 50 is installed in the outlet portion 30-3. 7A shows the outlet portion 30-3 after the contact plate 50 is installed in the outlet portion 30-3 shown in FIG. 8 in a cross section taken along the line BB in FIG. FIG. 7B is a diagram showing the left half when the outlet 30-3 shown in FIG. 7A is viewed from the compressed air inflow side (direction C in FIG. 8). FIG. 9 is a perspective view showing the appearance of the backing plate 50 before being installed in the outlet portion 30-3. In addition, the structure and function of the contact plate 50 shown to Fig.7 (a), (b) are the same as that of the contact plate 15 shown to Fig.3 (a), and description of a common part is abbreviate | omitted.

  A seat surface 41 is formed on the outlet portion 30-3 so as to protrude from the inner wall side surface toward the space in the outlet portion 30-3, and a seat portion 42 is formed at a substantially central portion of the seat surface 41. (See FIGS. 7A, 7B and 8). A contact plate 50 is in contact with the surface of the seat surface 41 on the compressed air inflow side, and is fixed to the seat portion 42 with bolts 51 (see FIGS. 7A and 7B).

  In the exit portion 10-3 having the conventional structure shown in FIG. 3, although a backing plate 15 is provided, there is a slight gap between the width direction end portion of the backing plate 15 and the inner wall side surface of the exit portion 10-3. Vacant. The gap serves as a water passage from the compressed air collision surface (hereinafter referred to as the surface of the contact plate 15) of the contact plate 15 to the back surface thereof, and the condensed water grown on the surface of the contact plate 15 is the outer periphery of the contact plate 15. There is a risk of leaking from this passage into the area on the back side of the backing plate 15. In this case, the condensed water leaking to the back side of the contact plate 15 may be sucked into the high pressure side cylinder 12.

  In the outlet portion 30-3 shown in FIGS. 7A and 7B, the back surface side of the backing plate 50 is contacted with the seating surface 41 formed on the inner wall surface from the outer periphery of the backing plate 50. The water passage to the region of the outlet 30-3 of the water is blocked. For this reason, when water condensed in the heat exchanger section 30-2 hits the backing plate 50 together with the compressed air and grows and grows from the outer periphery of the backing plate 50, the rear side of the backing plate 50, that is, the rear of the outlet portion 30-3. Condensed water is prevented from leaking into the side area. The condensed water that has grown and grown on the surface of the contact plate 50 flows downward, travels along the U-shaped portion of the toy 50-1, and accumulates at the bottom of the outlet portion 30-3. Therefore, the dew condensation water separated from the compressed air at the outlet portion 30-3 is discharged from the hole portion 305 to the outside of the outlet portion 30-3 without re-scattering in the outlet portion 30-3.

  10A and 10B are views showing a state in which the frame 70 is attached to the cooling unit 30 shown in FIG. 4, and FIG. 10A is a view of the cooling unit 30 to which the frame 70 is attached viewed from the same direction as FIG. 10B is a view of the cooling unit 30 shown in FIG. 10A as viewed from the back side of FIG. 10A.

  As shown in FIGS. 10A and 10B, the frame 70 is installed so as to cover one side surface of the heat exchanger section 30-2 shown in FIG. 4, and is provided in each of the inlet section 30-1 and the outlet section 30-2. The seats 71 and 72 (refer to FIG. 10B) are fixed to each other by bolts 73.

  A ventilation hole 76 is provided at the center of the frame 70 in order to prevent a decrease in cooling efficiency of the heat exchanger section 30-2. Bolts 74 are penetrated at the upper end in FIG. 10A of the frame 70 and are fixed to the frame 70 by welding, and a bolt screw portion 75 traveling on the outside of the frame 70 is attached to, for example, a belt cover (not shown). By fixing, the cooler 30 is attached to the multistage compressor as an integral structure.

  10A and 10B, since the rigidity of the entire cooler 30 can be increased using the frame 70, the heat exchanger part 30-2 itself does not need to have particularly high rigidity and strength. A high-strength and inexpensive configuration can be realized without impairing the cooling performance. The frame 70 is not limited to the structure shown in FIGS. 10A and 10B. For example, a frame 70 ′ having the structure shown in FIG. 11 can be used.

  In the present embodiment, the heat exchanger section 30-2 is configured by only the heat transfer tube 38, the heat radiating plate 39, and the flanges 32 and 33, and a frame 70 is separately provided outside them for the purpose of securing rigidity and strength. However, the present invention is not necessarily limited to such a configuration. For example, a housing that covers the heat transfer tube 38 and the heat radiating plate 39 may be provided between the flanges 32 and 33.

  In the present embodiment, since the inlet portion 30-1 and the outlet portion 30-3 are made of a casting, it is not necessary to increase the overall thickness as in the structure by sheet metal processing shown in FIG. For example, as shown in FIG. 12, the pressure resistance can be improved only by increasing the wall thickness or forming ribs only in the portion where the side pressure resistance is required. For this reason, it becomes possible to implement | achieve the intensity | strength improvement of the entrance part 30-1 and the exit part 30-3 cheaply. In addition, FIG. 12 is a figure which shows the structure which looked at the exit part 30-3 which made thickness of the box-shaped side surface center part thick from the A direction of Fig.7 (a).

  As described above, according to the present embodiment, the inlet portion 30-1, the heat exchanger portion 30-2, and the outlet portion 30-3 are detachably provided as independent units, thereby causing a failure in a part of the cooler 10. When such a situation occurs, it can be individually replaced and repaired, and an inexpensive and efficient response is possible. In addition, according to the present embodiment, the cooling performance, strength, rust prevention, etc. are achieved by making the inlet 30-1, the heat exchanger 30-2, and the outlet 30-3 independent units. In consideration of this, it is possible to configure each part by appropriately selecting a material and a manufacturing method suitable for each. For this reason, reliability, such as strength and rust prevention, can be improved at a low cost without impairing the cooling performance. Further, by adopting the above configuration, the size and shape of each part can be appropriately selected and combined according to the specifications of the compressor, and can be adapted to various specifications of the compressor.

  Further, in the present embodiment, since a plate-type heat exchanger that performs heat exchange with cooling air from the compressor pulley to cool is adopted, there is no need to provide a cooling medium supply structure as a heat exchanger, Space saving is possible, and it can be manufactured at low cost.

  Next, 2nd Embodiment regarding an exit part is described using FIG. FIG. 13: is sectional drawing which shows the structure of the exit part 80-3 provided in the cooler which concerns on 2nd Embodiment. On the bottom surface of the outlet portion 80-3 shown in FIG. 13, slopes 81 and 82 that descend toward the release valve hole 83 are formed. By forming such slopes 81 and 82, the water separated from the compressed air at the outlet 80-3 is reliably discharged from the outlet 80-3.

  FIG. 13 is different from FIG. 7A only in that slopes 81 and 82 are provided on the bottom surface of the outlet portion 30-3 in FIG. 7A, and other configurations are the same as those in FIGS. 7A and 7B. It is.

  Next, 3rd Embodiment regarding an exit part is described using Fig.14 (a), (b). FIG. 14 is a diagram illustrating a configuration of the outlet 90-3 provided in the cooler according to the third embodiment. FIG. 14A illustrates a structure in which the shielding plate 90 is provided in the structure illustrated in FIG. 14B is a cross-sectional view showing the configuration of the outlet portion 90-3, and FIG. 14B is a diagram showing the configuration of the outlet portion 90-3 shown in FIG. 14A viewed from the compressed air inflow side.

  In FIG. 14 (a), plate-shaped shielding portions 92 projecting horizontally from both side surfaces of the inner wall of the outlet portion 90-3 are provided near the bottom surface of the outlet portion 90-3. A groove 91 as a water passage is formed in the shielding portion 92 so as to extend in the direction of compressed air flow. The water separated from the compressed air is collected in the U-shaped toy 50-1 along the surface of the backing plate 50 and flows down, like the outlet 30-3 shown in FIG. Along the upper surface of the shielding part 92. The water collected on the upper surface of the shielding part 92 passes through the groove 91 and accumulates at the bottom part 93 of the outlet part 90-3.

  Thus, by providing the shielding part 92, even if compressed air flows in the vicinity of the bottom part 93 during operation, it is prevented that water accumulated in the bottom part 93 is re-scattered into the outlet part 90-3. Inflow of water to the high pressure side can be reliably prevented.

  In addition, as a water flow path of the water collected on the shielding part 92, it is not restricted to the groove | channel 91, For example, a hole may be formed in the shielding part 92 and it may be used as a water flow path. Further, the shielding portion 92 is not necessarily limited to a plate-like body as shown in FIG. 14, and it is possible to prevent re-scattering of water by providing a mesh body such as a metal scrubber, for example.

  The present invention is not limited to the structure shown in the above-described embodiment, and for example, a configuration may be adopted in which slopes 81 and 82 are provided at the bottom of the outlet and a shielding part 92 is provided in the vicinity of the bottom. In the above-described embodiment, a two-stage compressor has been described as an example for the sake of simplification. However, the present invention is not necessarily limited to a two-stage compressor and includes three or more cylinders. It is also possible to use a compressor.

DESCRIPTION OF SYMBOLS 1 ... Tank, 2 ... Motor, 3 ... Compressor body, 4 ... Belt, 5 ... Compressor pulley, 6 ... Suction silencer, 7 ... Discharge piping, 9, 11 ... Piping, 8 ... Low pressure side cylinder, 10, 30 ... Cooler, 10-1, 30-1 ... Inlet part, 10-2, 30-2 ... Heat exchanger part, 10-3, 30-3, 80-3, 90-3 ... Outlet part, 12 ... High pressure side Cylinder, 13, 38 ... Heat transfer tube, 14, 39 ... Radiating plate, 15, 50 ... Catch plate, 15-1, 50-1 ... Toy, 16 ... Release valve, 17, 18 ... End plate, 19-1-19 -3 ... mounting portion, 20 ... reinforcing plate, 21 ... introduction port, 22 ... discharge port,
31, 32, 33, 34 ... flange, 301, 304 ... main body, 35, 36, 51, 73, 74 ... bolt, 37, 40 ... O-ring groove, 41 ... seating surface, 42 ... seat, 305 ... hole 70, 70 '... frame, 71, 72 ... seat, 75 ... bolt screw part, 76 ... vent hole, 83 ... release valve hole part, 81, 82 ... inclined, 91 ... groove, 92 ... shielding part, 93 …bottom

Claims (14)

Low pressure side cylinder,
A cooler for cooling the compressed air compressed in the low pressure side cylinder;
A high pressure side cylinder for further compressing the compressed air cooled by the cooler;
Cooling means for sending cooling air to the cooler, and
The cooler includes an inlet portion into which compressed air is introduced from the low-pressure side cylinder, a heat exchanger portion that cools the compressed air flowing from the inlet portion with cooling air from the cooling means, and the heat exchanger portion. And an outlet unit that separates droplets contained in compressed air that is cooled by and supplied to the high-pressure side cylinder.
The heat exchanger part is fastened to the inlet part and the outlet part in a detachable manner via a flange ,
A seating surface is formed on the inner wall side surface of the outlet portion so as to protrude from the inner wall side surface toward the space in the outlet portion, and moisture contained in the compressed air is transferred from the compressed air to the seating surface. A multi-stage compressor, wherein a separating plate is abutted .   2. The multistage compressor according to claim 1, wherein the cooling means is a compressor pulley fixed to a crankshaft connected to pistons respectively provided in the low pressure side cylinder and the high pressure side cylinder.   2. The multistage compressor according to claim 1, wherein each of the inlet portion and the outlet portion is made of a casting in which a main body portion and a flange portion are integrally formed by casting. The heat exchanger unit includes a heat transfer tube and the heat radiating plate passing the compressed air, the heat transfer tube is made of a copper-based metallic material,
The multi-stage compressor according to claim 1, wherein the inlet portion and the outlet portion are made of a casting that is cast using a non-ferrous metal material.   The inlet portion and the outlet portion are made of an aluminum alloy cast cast using an aluminum cast alloy material, and an oxide film is formed on the surface of the aluminum alloy cast by an anodic oxide film treatment. The multistage compressor according to claim 1, wherein the multistage compressor is characterized in that:   The multistage compressor according to claim 5, wherein a resin coating is applied to the oxide film surfaces of the flange portions of the inlet portion and the outlet portion. 2. The multistage compression according to claim 1, wherein a bottom surface of the outlet portion is provided with a slope that descends toward a discharge port that discharges droplets separated from the compressed air at the outlet portion. Machine.   The multistage compressor according to claim 1, wherein a shielding part having a water passage is provided above the bottom surface of the outlet part. It has a frame provided so as to cover at least one side surface of the inlet part, the heat exchanger part or the outlet part, and is provided so as to cover at least the belt wound around the compressor pulley. The multistage compressor according to claim 2, wherein the frame is fixed to a belt cover, and the cooler is fixed to the multistage compressor. An inlet portion through which compressed air is introduced;
A heat exchanger section for cooling the compressed air introduced from the inlet section by heat exchange with external air;
An outlet unit for separating droplets contained in compressed air cooled by the heat exchanger unit, and a separate unit, respectively.
The heat exchanger section includes a heat radiating plate that radiates heat of compressed air, and a heat transfer tube that is provided through the heat radiating plate.
The heat exchanger part is fastened to the inlet part and the outlet part in a detachable manner via a flange ,
A seating surface is formed on the inner wall side surface of the outlet portion so as to protrude from the inner wall side surface toward the space in the outlet portion, and moisture contained in the compressed air is transferred from the compressed air to the seating surface. A cooler for a multistage compressor, wherein a separating plate is in contact . The heat exchanger unit, passing the compressed air having the heat transfer tubes and the heat radiating plate, the heat transfer tube is made of a copper-based metallic material,
The cooler for a multi-stage compressor according to claim 10, wherein the inlet and the outlet are made of a casting cast using a non-ferrous metal material.   The cooler for a multistage compressor according to claim 10, wherein each of the inlet portion and the outlet portion is made of a casting in which a main body portion and a flange portion are integrally formed by casting.   The inlet portion and the outlet portion are made of an aluminum alloy cast cast using an aluminum cast alloy material, and an oxide film is formed on the surface of the aluminum alloy cast by an anodic oxide film treatment. The cooler for a multistage compressor according to claim 10, wherein the cooler is a multistage compressor.   14. The cooler for a multistage compressor according to claim 13, wherein the surface of the oxide film on the flange portion of the inlet portion and the outlet portion is coated with resin.

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