JP4314131B2 - Cooling mechanism for engine-driven oil-free compressor - Google Patents

Description

  The present invention relates to a cooling mechanism for an engine-driven oil-free compressor. More specifically, the present invention is used for an engine provided in the compressor, a compressor body, compressed gas discharged from the compressor body, and lubrication of each part. The present invention relates to a cooling mechanism that cools lubricating oil and the like.

  An oil-free screw compressor accommodates a pair of male and female screw rotors in a cylinder, and eliminates the need to inject lubricating oil into the cylinder in the process of compressing compressed gas by meshing rotation of the screw rotor. A compressor main body is provided. According to this compressor, compressed gas containing no oil can be obtained.

  However, in the oil-cooled screw compressor body, since the lubricating oil injected into the cylinder functions as a refrigerant, the cooling of the cylinder is performed by injecting this lubricating oil, but the oil-free compressor In this case, since the lubricating oil is not injected into the cylinder as described above, the compressed gas discharged from the compressor main body has a relatively high temperature. Therefore, for example, in a compressor having a multi-stage compressor body, for example, a two-stage compressor body having a low-pressure stage and a high-pressure stage, relatively high-temperature compressed gas discharged from the low-pressure stage compressor body is used as it is. When it is introduced into the compressor body of the stage, the performance of the compressor body is degraded.

  Further, as described above, the compressed gas discharged from the oil-free compressor main body does not contain oil, but when the compressed gas is, for example, air, the obtained compressed gas has humidity in the air. Therefore, if the dried compressed gas from which moisture has been removed is supplied to the consumer side, it is once cooled to aggregate and remove the moisture contained in the compressed gas. There is a need.

  Therefore, in the oil-free compressor, the compressed gas discharged from the compressor main body is cooled by passing through a compressed gas cooler such as an aftercooler before supplying it to the consumption side to aggregate moisture, and this aggregated moisture Is recovered by a drain separator or the like, or in a configuration having a multi-stage compressor body, for example, a low-pressure stage and a high-pressure stage two-stage compressor body, is discharged from the low-pressure stage compressor body. A configuration is adopted in which the compressed gas is cooled by a compressed gas cooler such as an intercooler and then introduced into the compressor body of the high-pressure stage.

  Furthermore, in the case of an oil-free compressor body that does not inject lubricating oil into the cylinder as described above, cooling of the compressor body by injecting lubricating oil cannot be expected. A water jacket that forms a flow path of cooling water is formed in the main body, and cooling is performed by introducing a cooling medium into the water jacket.

  In addition, the oil-free compressor is, for example, a gear provided in a power transmission mechanism or a speed increasing device that transmits the rotation of a prime mover such as a motor or an engine to the compressor main body, or a male / female two provided in the compressor main body. Lubricating oil is supplied to timing gears that regulate the rotation timing of two rotors, rotor shaft bearings, etc. (referred to herein as “lubricated parts”), and the lubricating oil that has lubricated each part is introduced into an oil cooler. Cooling is done.

  In an engine drive type compressor in which the compressor body is driven by an engine, a cooling medium is introduced into the water jacket of the engine and cooled in order to cool the engine.

  In this way, the engine-driven oil-free compressor has many devices that require cooling, such as a compressed gas cooler such as an aftercooler or an intercooler, an engine, a compressor body, an oil cooler, etc. When a circuit for supplying and collecting the cooling medium independently for each of these devices and a cooler such as a radiator for cooling these media are provided, the overall configuration of the compressor becomes complicated, and it is possible to prevent malfunctions. The reliability is lowered and the number of parts is increased, so that the design, assembly, maintenance and the like become complicated, and the whole compressor becomes large.

  Moreover, such an increase in the number of parts leads to an increase in the weight of the entire compressor, and a cooling medium containing coolant for each cooling device, such as for the compressor main body, for the engine, and for the compressed gas cooler. Since it is necessary to use these, the amount of the cooling medium used increases, and the accompanying weight increases. In addition, it is necessary to replenish and replace these cooling media for each cooling device, and maintenance work becomes complicated.

  Therefore, in order to solve such a problem, as shown in FIG. 4, the water jacket outlet 24 of the compressor body 20 and the water jacket inlet 41 of the engine 40 are communicated with each other, and the compressor body 20 and the engine 40 are connected. Are placed in a common cooling medium circulation system and can be cooled by a common medium, and a radiator 120 is arranged in the medium circulation system to cool the compressor main body 20 and the engine 40. An engine-driven oil-free compressor that can cool the coolant used in the above (see FIG. 1 of Patent Document 1), or a compressed gas such as an aftercooler 50 in the cooling medium circulation system as shown in FIG. In addition to the compressor main body 20 and the engine 40, the compressed gas discharged from the compressor main body 20 is also cooled by the same medium. There are those forms (see FIG. 9 of Patent Document 1).

Prior art document information of the present invention includes the following.
JP 2002-322992 A (page 2-7, FIG. 1-10).

  In the engine-driven oil-free compressor 1 described in Patent Document 1 configured as described above, the compressor main body 20, a compressed gas cooler such as the aftercooler 50, the engine 40, and the like that require cooling. By arranging the devices in a common cooling medium circulation system, the piping configuration can be simplified, the amount of the cooling medium to be used can be reduced, and the devices such as the radiator 120 can be shared. There are advantages such as being able to.

  However, a medium used for cooling the engine 40 (referred to as “coolant” in the present specification) and a cooling medium used in the compressor main body 20, the compressed gas cooler (aftercooler 50), etc. The cooling medium used for cooling the compressed gas is simply referred to as “cooling medium”, and the coolant, cooling medium and other lubrication / cooling media are collectively referred to as “cooling medium”), because the optimum temperatures are different. As described above, when the compressor body 20 and the compressed gas cooler and the engine 40 are cooled by the same medium, the cooling medium set to the optimum temperature for one of the devices is the other. The temperature is too high or too low for the device.

  For example, the temperature of the cooling medium in the water jacket of the engine 40 is preferably maintained at 80 to 90 ° C. in order to operate the engine efficiently. Usually, the coolant circulation system has a temperature of the cooling medium. In order to maintain the temperature at this temperature, a thermostat is provided, and the cooling medium is not introduced into the radiator 120 until the cooling medium reaches 80 to 90 ° C. by the thermostat.

  On the other hand, the lower the temperature of the cooling medium introduced into the compressed gas cooler such as the water jacket of the compressor body 20 or the aftercooler 50, the better the performance, and the lower the power consumption per unit gas amount. To do.

  Thus, as an example, a bypass circuit that bypasses the radiator 120 as shown in FIG. 5 while providing a compressed gas cooler such as the engine 40, the compressor body 20, and the aftercooler 50 in the same cooling medium circulation system, A heat-sensitive bypass valve that selectively opens and closes the bypass circuit or the circuit leading to the radiator is provided, and the cooling medium for the radiator 120 is maintained until the cooling medium reaches an appropriate temperature (for example, 80 ° C.) for cooling the engine. If the configuration for stopping the introduction is adopted, the temperature of the cooling medium is too high as the temperature of the cooling medium introduced into the compressor body 20 or the compressed gas cooler such as the aftercooler 50, the compressor body 20, The compressed gas cannot be cooled sufficiently.

  In the cooling mechanism of the engine-driven oil-free compressor described in Patent Document 1, the cooling medium that passes through the radiator 120 by introducing the cooling air generated by the cooling fan 43 into the radiator 120. However, when the radiator 120 is placed in a package that accommodates equipment such as the compressor body 20 and the engine 40, a space for placing the radiator 120 in the package is provided. It is necessary to ensure, and the whole apparatus becomes large.

  Further, when the installation place of such a package type compressor is, for example, a place where it is difficult to circulate the air, the air heated through the radiator 120 is reintroduced into the radiator 120 as cooling air, etc. If the cooling medium in the radiator 120 cannot be sufficiently cooled and the ambient temperature is high, such as during operation in summer, overheating may occur.

  In consideration of such points, if the radiator 120 is enlarged in order to sufficiently cool the cooling medium, the size of the cooling air introduction fan 43 needs to be increased accordingly. However, it is necessary not only to increase the size but also to increase the inlet and outlet of the cooling air formed in the package, so that the noise in the package tends to leak out of the machine, and the soundproofing effect of the package is reduced.

  The present invention was made in order to eliminate the above-mentioned drawbacks in the prior art, and for a plurality of devices that need to be cooled, pipes, cooling medium coolers, etc. are used in common, and the overall configuration The cooling medium used for cooling the compressor main body and compressed gas, which is preferably cooled by a relatively low temperature cooling medium, and cooling for cooling the engine, while simplifying, downsizing, and reducing the amount of cooling medium used It is an object of the present invention to provide a cooling mechanism for an engine-driven oil-free compressor in which the temperature of the working medium can be set separately.

  Another object of the present invention is to increase the overall size of the apparatus by increasing the size of the radiator described above, poor cooling such as overheating that may occur depending on installation conditions, leakage of noise through the inlet and outlet of cooling air, and the like. An object of the present invention is to provide an engine-driven compressor cooling mechanism that can prevent the cooling medium and reliably cool the cooling medium.

In order to achieve the above object, a cooling mechanism for an engine-driven oil-free compressor according to the present invention comprises an oil-free compressor body 20 and an engine-driven oil provided with an engine 40 that drives the compressor body 20. In free compressor,
A compressed gas cooler such as an aftercooler 50 for cooling the compressed gas discharged from the compressor body 20, and a cooling medium supply source such as a cooling tower 90 for supplying a cooling medium to the compressed gas cooler; A supply system for introducing a cooling medium from a supply source to the compressed gas cooler (in FIG. 1, a system from the cooling tower 90 to the aftercooler 50 via the water supply pipe 100), and the cooling exhausted from the compressed gas cooler A discharge system for recovering the medium (in FIG. 1, a system extending from the aftercooler 50 to the outside of the package 10 through the recovery pipe 110 (110a, 110b)),
A coolant cooler 60 for cooling the coolant returned from the engine 40 is provided, and a coolant circulation system is formed between the engine 40 and the coolant cooler 60;
The coolant cooler 60 is disposed in the discharge system that collects the cooling medium discharged from the compressed gas cooler, and the coolant and the cooling medium discharged from the compressed gas cooler are placed in the coolant cooler 60. In claim 1, heat exchange is possible (claim 1).

  In the engine-driven oil-free compressor 1 having the above configuration, the engine 40, the compressor main body 20, the compressed gas cooler (aftercooler 50, intercooler 50 ′), and the coolant cooler 60 are accommodated in the package 10. The cooling medium supply source (cooling tower 90) may be arranged outside the package 10 (claim 2).

  Thus, in the configuration in which the cooling medium supply source is arranged outside the package, the cooling medium supply source cools the cooling medium collected through the discharge system and supplies the cooling medium to the supply system, for example, cooling It can be set as the cooler of cooling media, such as tower 90 (Claim 3).

  Further, the compressor main body may be water-cooled, and the compressor main body may be disposed in the supply system so that it can be cooled by a cooling medium in the supply system.

  The above-described configuration of the present invention cools the circulation system in which the coolant that preferably has a relatively high temperature flows, and the compressed gas discharged from the compressor body 20 and the compressor body 20 that preferably have a relatively low temperature. The cooling medium supply / discharge system through which the cooling medium flows is an independent system, so that the temperature of the coolant and the cooling medium for cooling the compressed gas and the compressor main body can be set independently. It was possible to provide a cooling mechanism.

  In particular, as a configuration of the compressor body 20, when adopting a multi-stage configuration of a plurality of compressor bodies, before being introduced into the next-stage compressor body, the compressed gas discharged from the previous-stage compressor body, It became possible to sufficiently cool by a compressed gas cooler such as an intercooler, and the performance of the compressor body could be improved.

  Further, in the configuration in which the cooling medium supply source is a cooler that cools the cooling medium after heat exchange and circulates again, and this is disposed outside the package 10, it is not necessary to provide a radiator or the like in the package 10. As a result, the package 10 can be reduced in size, the amount of cooling air sucked into and discharged from the package 10 can be reduced, and the inlet and outlet of cooling air formed in the package 10 can be reduced. I was able to. As a result, it is difficult for the noise in the package to leak out through the cooling air inlet and outlet, thereby improving the soundproofing effect of the package 10 and providing a low noise compressor.

  Furthermore, since the cooling medium supply source such as the cooling tower 90 is arranged outside the package 10, the cooling medium supply source can be arranged at a position different from the package 10 and each device accommodated in the package 10. Thus, it is possible to cool the equipment accommodated in the package 10 without being affected by the installation location. As a result, an engine-driven oil-free compressor that can be installed anywhere is provided.

  Next, embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1
As shown in FIG. 1, an oil-free compressor 1 to which a cooling device of the present invention is applied includes an oil-free compressor body 20 and an engine 40 that drives the compressor body 20, and the compressor An aftercooler 50 that cools the compressed gas that is compressed and discharged by the main body 20 and a coolant cooler 60 that cools the cooling medium for cooling the engine 40 are accommodated in the package 10.

  Of these, the aftercooler 50 includes a compressed gas inlet 51 for introducing a compressed gas to be cooled, and a compressed gas outlet 52 for deriving the compressed gas cooled in the aftercooler 50. In addition, the water supply port 53 for introducing a cooling medium (cooling water) that exchanges heat with the compressed gas to cool the compressed gas, and the cooling water after heat exchange with the compressed gas is discharged. A drain port 54 is provided.

  The coolant cooler 60 includes an inlet 61 for introducing the coolant that has cooled the engine 40 and a lead-out port 62 for leading the coolant after cooling, and a cooling medium ( A water supply port 63 for introducing (cooling water) and a drain port 64 for discharging the cooling water after heat exchange with the coolant are provided.

  The compressed gas inlet 51 provided in the aftercooler 50 communicates with the discharge port 29 of the compressor body 20, and the compressed gas outlet 52 provided in the aftercooler 50 is connected via a drain separator 81. The compressed gas discharged from the compressor main body 20 is communicated with the service valve 83 to which an unillustrated air working machine or the like is connected, and after cooling through the aftercooler 50, the condensate generated by this cooling is collected. It is removed by the drain separator 81 and can be supplied to the consumption side thereafter.

  The inlet 61 provided in the coolant cooler 60 is communicated with the outlet 42 of the water jacket provided in the engine 40, and the outlet 62 of the coolant cooler is communicated with the inlet 41 of the engine water jacket. ing. Therefore, a coolant circulation system is formed between the water jacket of the engine 40 and the coolant cooler 60.

  In the coolant circulation system, a pump P1 for circulating the coolant in the circulation system is provided. In the illustrated embodiment, a passage communicating with the water jacket inlet 41 in the engine 40 is provided. This pump P1 is provided.

  Further, in the coolant circulation system, it is preferable to provide means for stopping the introduction of the coolant to the coolant cooler 60 when the temperature of the coolant in the circulation system is low. A thermostat 84 is provided in a passage communicating with the water jacket outlet 42 in the engine 40, and the thermostat 84 and the inlet side passage of the pump P1 are communicated with each other by a bypass passage. The passage leading to the outlet 42 is closed and the bypass passage is opened to automatically control the coolant temperature.

  The cooling water introduced into the aftercooler 50 and the coolant cooler 60 and exchanging heat with the compressed gas or the coolant is supplied from a cooling medium supply source arranged outside the package 10 as shown in FIG. In the illustrated embodiment, a cooling water supply source for this cooling water is used for heat exchange, recovers the cooling water whose temperature has risen, and cools the recovered cooling water, for example, a cooling tower 90. Provided.

  A water supply pipe 100 that introduces cooling water from a cooling medium supply source into the package communicates with a water supply port 53 of the aftercooler 50 to form a cooling water supply system for the aftercooler 50. A recovery pipe 110 communicating with the drain port 54 is extended outside the package 10 to form a cooling water discharge system.

  As described above, in the illustrated embodiment that uses the cooling tower 90 that cools the recovered cooling water and circulates it again as the cooling medium supply source, it is extended outside the package as described above. A recovery pipe 110 is communicated with a recovery port 92 of the cooling tower 90, and a cooling water circulation system is circulated between the cooling tower 90 and the aftercooler 50 by the supply system and the discharge system.

  However, the above-described cooling medium supply source used in the cooling mechanism of the present invention is not limited to the one that cools and circulates the cooling water as shown in the figure. For example, the engine-driven oil provided with the cooling device of the present invention When the free compressor is used as a fixing device, water obtained from a water supply or the like may be introduced into the water supply pipe 100 as cooling water, and the configuration is not limited to the illustrated embodiment. .

  The above-described recovery pipe 110 that constitutes the cooling water discharge system cools the first recovery pipe 110a that connects the aftercooler drain port 54 to the water supply port 63 of the coolant cooler 60 and the drain port 64 of the coolant cooler 60. The second recovery pipe 110b communicates with the recovery port 92 of the tower 90, and is supplied to the aftercooler 50 from the cooling tower 90 and is heat-exchanged with the compressed gas discharged from the compressor body 20 in the aftercooler 50. The cooling water is introduced into the coolant cooler 60 in the process of being recovered by the cooling tower 90, and heat exchange with the coolant is performed in the coolant cooler 60.

  In order to cause such cooling water circulation, either the cooling water supply system or the discharge system is provided with a pump P2 for flowing the cooling water. Is in the water supply pipe 100 for introducing the cooling water from the cooling tower 90 to the aftercooler 50, and this pump P 2 is provided outside the package 10.

  In the engine-driven oil-free compressor 1 configured as described above, the system in which the cooling medium (cooling water) for cooling the aftercooler 50 and the system in which the coolant flows are independent of each other. The heat removed from the engine 40 can be indirectly discharged by introducing the cooling water after the heat exchange by the aftercooler 50 into the coolant cooler 60 and exchanging the heat between the coolant and the cooling water. It is said.

  As a result, the cooling water introduced into the aftercooler 50 that cools the compressed gas, preferably cooled by a low-temperature cooling medium, and the coolant temperature introduced into the engine 40, preferably cooled by a relatively high-temperature cooling medium, As an example, the coolant is set to 80 to 90 ° C. by the above-described thermostat 84, and the temperature of the cooling water introduced into the aftercooler 50 is an example although it depends on the performance of the cooling tower 90. It can be set to about 20 to 25 ° C.

  Moreover, since cooling of a coolant is performed by heat exchange with the warmed cooling water after heat exchange with the compressed gas in the aftercooler 50, the overcooling of a coolant can be prevented.

  And in the structure of this invention made into the structure which cools the cooling water heat-exchanged with compressed gas and coolant in this way with the cooling tower 90 arrange | positioned out of the package 10, in a package 10, such as a radiator There is no need to provide a means for cooling the cooling water. Therefore, the package 10 can be reduced in size, and the inlet and outlet of the cooling air formed in the package 10 can be reduced. The soundproofing effect can be improved.

  Further, even when the package 10 and the devices arranged in the package 10 are installed in a place where it is difficult for air to circulate, problems such as overheating occur by arranging the cooling tower 90 in a place away from these. The degree of freedom in selecting the installation location of the engine-driven oil-free compressor 1 equipped with the cooling mechanism of the present invention is improved.

[Embodiment 2]
The compressor main body 20 of the engine-driven oil-free compressor 1 to which the cooling mechanism of the present invention is applied is an air-cooled compressor main body as in the embodiment described with reference to FIG. Although it is good also as what does not provide the structure which cools 20 with cooling water, the water-cooled thing provided with the water jacket as a compressor main body 20 is employ | adopted, and the cooling water supplied from the cooling tower 90 in this water jacket It may be configured to introduce and cool. An example of the configuration in this case is shown in FIG.

  Thus, when cooling the compressor main body 20 with cooling water, as shown in FIG. 2, the water supply pipe 100 from the cooling tower 90 is branched in the package 10, and one of the aftercooler 50 is branched. The other of the water supply port 53 and the water jacket inlet 23 of the compressor body 20 communicate with each other.

  Then, both the drain port 54 of the aftercooler 50 and the water jacket outlet 24 of the compressor body 20 are communicated with the water supply port 63 of the coolant cooler 60, and the coolant passing through the aftercooler 50 and the compressor body 20 are passed. It is possible to introduce the coolant to the coolant cooler 60 together.

  Further, the cooling water circulation system configured as described above is provided with an oil cooler 70 that cools the lubricating oil that has lubricated the lubricated part by heat exchange with the cooling water circulating in the circulation system. In the illustrated embodiment, the oil cooler 70 is disposed in a pipe line that communicates the water supply pipe 100 and the recovery pipe 110b downstream of the coolant cooler 60.

  In the cooling mechanism of the oil-free compressor configured as described above, since both the aftercooler 50 and the compressor body 20 can directly introduce the cooling water supplied from the cooling tower 90, the compressed gas and Any of the compressor main bodies 20 can be suitably cooled.

  In addition, the cooling water warmed by the heat exchange with the compressed gas in the aftercooler 50 and the cooling water warmed by the cooling of the compressor body 20 are introduced into the coolant cooler 60, and the heat exchange between the cooling water and the coolant is performed. Therefore, overcooling of the cooling medium for cooling the engine can be prevented.

[Embodiment 3]
As described above, in the embodiment described with reference to FIGS. 1 and 2, the cooling mechanism of the present invention is applied to the engine-driven oil-free compressor 1 including the single compressor body 20. As described above, the cooling mechanism of the present invention is not limited to the oil-free compressor provided with the single-stage compressor main body 20, and the two-stage compressor main body 20 (21, 27) of the low pressure stage and the high pressure stage is used. The present invention can be applied to the oil-free compressor 1 provided, and can also be applied to an oil-free compressor including two or more stages of compressor bodies.

  In the embodiment shown in FIG. 3, as an example, the oil-free compressor 1 includes a two-stage compressor body 20 (21, 27) of a low-pressure stage and a high-pressure stage, and is discharged from the compressor body 21 of the low-pressure stage. The compressed gas thus obtained is cooled by an intercooler 50 'that is a cooler of the compressed gas and drained by a drain separator 82, and then introduced into the compressor main body 27 of the high-pressure stage to be further compressed. As shown in the figure, the discharge port 26 of the low-pressure stage compressor body 21 communicates with the suction port 28 of the high-pressure stage compressor body 27 via an intercooler 50 'and a drain separator 82. .

  The discharge port 29 of the high-pressure stage compressor body 27 communicates with a service valve 83 to which an unillustrated air working machine or the like is connected via an aftercooler 50 and a drain separator 81, and the high-pressure stage compressor body 27 The compressed and discharged compressed gas can be introduced to the consumer side.

  In addition, as a power transmission mechanism for transmitting the rotational driving force of the engine 40 to the two compressor bodies 21 and 27 of the low pressure stage and the high pressure stage, respectively, the rotation of the engine is increased and the compressor bodies of the low pressure stage and the high pressure stage are accelerated. A speed increasing device 30 is provided for transmission.

  The above-described intercooler 50 ′ cools the compressed gas by exchanging heat between the cooling water supplied from the cooling tower 90 and the compressed gas discharged from the compressor main body 21 of the low-pressure stage, thereby The compressor body 27 can be introduced into the suction port 28. The compressor body 27 is provided with an introduction port 51 'for introducing compressed gas discharged from the discharge port 26 of the low-pressure stage compressor body 21, and is cooled by heat exchange. A lead-out port 52 ′ for leading the compressed gas is provided.

  The introduction port 51 ′ of the intercooler 50 ′ is communicated with the discharge port 26 of the low-pressure stage compressor body 21, and the outlet 52 ′ of the intercooler 50 ′ is compressed via the drain separator 82. It communicates with the suction port 28 of the machine body 27.

  Then, the water supply pipe 100 from the cooling tower 90 is communicated with the water supply port 53 ′ of the intercooler 50 ′ to introduce the cooling water into the intercooler 50 ′, and the water outlet 54 ′ of the intercooler 50 ′ is supplied to the water supply of the aftercooler 50. The cooling water communicated with the port 53 and passed through the intercooler 50 ′ can be introduced into the aftercooler 50.

  In addition, referring to FIG. 1 and FIG. 2 described above, the cooling water that has passed through the aftercooler 50 is introduced into the coolant cooler 60 and the cooling water that has passed through the coolant cooler 60 is collected in the cooling tower 90. This is the same as the embodiment described above.

  In the embodiment shown in FIG. 3, the intercooler 50 ′ and the aftercooler 50 are connected in series in the water supply pipe 100, and the cooling water after passing through the intercooler 50 ′ is introduced into the aftercooler 50. However, for example, the water supply pipe 100 is branched and connected to the water supply port 53 ′ of the intercooler 50 ′ and the water supply port 53 of the aftercooler 50, and the drainage port 54 ′ of the intercooler 50 ′ and the drainage port 54 of the aftercooler 50 are connected. Both may be arranged in parallel to be connected to the water supply port 63 of the coolant cooler 60, and the cooling water from the cooling tower 90 before passing through the intercooler 50 ′ may be directly introduced into the aftercooler 50.

  Further, when one or both of the low-pressure stage and the high-pressure stage compressor bodies 21 and 27 are water-cooled compressor bodies equipped with a water jacket, the water supply pipe 100 is branched to compress the compressor. The point which can provide the structure which introduces cooling water in the water jacket of the main body (21 and / or 27) and cools the compressor main body is the same as the embodiment described with reference to FIG. is there.

  In the embodiment shown in FIG. 3, only the high-pressure stage compressor body 27 is shown as a water-cooled type having a water jacket, but the low-pressure stage compressor body 21 is also water-cooled. Can be.

  In this case, the outlet of the water jacket of the compressor body 21 of the low pressure stage is connected to the water jacket inlet of the compressor body 27 of the high pressure stage so that both compressor bodies are connected in series in the cooling water supply system. However, since it is preferable that the cooling water used for cooling the compressor main body is as low as possible, the water supply pipe 100 from the cooling tower 90 is branched to the respective compressor main bodies 21 and 27. For example, the cooling water from the cooling tower 90 can be directly introduced into the water jacket of any of the compressor main bodies 21 and 27, such as communicating with the inlet of the water jacket. good.

  In the embodiment shown in FIG. 3 configured as described above, the cooling water supplied from the cooling tower 90 is first introduced into the intercooler 50 ′ and compressed from the low-pressure stage compressor body 21. Cool the gas. Therefore, the compressed gas discharged from the compressor body 21 of the low-pressure stage is sufficiently cooled by heat exchange with the cooling water that has not yet been used for cooling and is supplied from the cooling tower 90, and then the high-pressure stage. The compressor body 27 is introduced into the suction port 28. As a result, since the compressed gas sufficiently cooled by the intercooler 50 ′ is introduced into the high-pressure stage compressor body 27, the power consumption per unit gas amount is reduced, and the performance of the high-pressure stage compressor body is reduced. Will improve.

The schematic explanatory drawing which shows the cooling mechanism of this invention. The schematic explanatory drawing which shows another cooling mechanism of this invention. The schematic explanatory drawing which shows another cooling mechanism of this invention. Schematic explanatory drawing which shows the conventional cooling mechanism. Schematic explanatory drawing which shows the conventional cooling mechanism.

Explanation of symbols

1 Oil Free Compressor 10 Package 20 Compressor Body 21 Low Pressure Stage Compressor Body 22 Suction Port (Low Pressure Stage Compressor Body)
23,23 'Water jacket inlet (compressor body)
24,24 'Water jacket outlet (compressor body)
26 Discharge port (of compressor body of low pressure stage)
27 High Pressure Stage Compressor Body 28 Suction Port (High Pressure Stage Compressor Body)
29 Discharge port (for the compressor body of the high-pressure stage)
30 Power transmission mechanism (speed increasing mechanism)
40 Engine 41 Water jacket inlet (engine)
42 Water jacket outlet (engine)
43 Cooling fan 50 After cooler 51 Inlet (aftercooler)
52 Outlet (aftercooler)
53 Water inlet (aftercooler)
54 Drainage port (aftercooler)
50 'intercooler 51' inlet (intercooler)
52 'outlet (for intercooler)
53 'water inlet (intercooler)
54 'drain (intercooler's)
60 Coolant cooler 61 Inlet (for coolant cooler)
62 Outlet (for coolant cooler)
63 Water supply port (for coolant cooler)
64 Drain port (for coolant cooler)
70 Oil cooler 71 Inlet (for oil cooler)
72 Outlet (for oil cooler)
73 Water supply (oil cooler)
74 Drain port (for oil cooler)
81,82 Drain separator 83 Service valve 84 Thermostat 90 Cooling medium supply source (cooling tower)
92 Recovery Port 100 Water Supply Pipe 110 Recovery Pipe 110a First Recovery Pipe 110b Second Recovery Pipe 120 Radiator P1, P2 Pump

Claims (4)

In an engine-driven oil-free compressor comprising an oil-free compressor body and an engine that drives the compressor body,
A compressed gas cooler that cools the compressed gas discharged from the compressor body and a cooling medium supply source that supplies a cooling medium to the compressed gas cooler are provided, and the compressed gas cooler is cooled from the cooling medium supply source. Forming a supply system for introducing a medium and a discharge system for collecting the cooling medium discharged from the compressed gas cooler;
Providing a coolant cooler for cooling the coolant returned from the engine, forming a coolant circulation system between the engine and the coolant cooler;
The coolant cooler is disposed in the discharge system that collects the cooling medium discharged from the compressed gas cooler, and heats the coolant and the cooling medium discharged from the compressed gas cooler in the coolant cooler. A cooling mechanism for an engine-driven oil-free compressor characterized by being replaceable.   The engine drive according to claim 1, wherein the engine, the compressor body, the compressed gas cooler, and the coolant cooler are accommodated in a package, and the cooling medium supply source is disposed outside the package. Type oil-free compressor cooling mechanism.   3. The engine-driven oil according to claim 2, wherein the cooling medium supply source is a cooling medium cooler that cools the cooling medium recovered via the discharge system and supplies the cooling medium to the supply system. Free compressor. The compressor main body is a water-cooled type, the compressor main body is disposed in the supply system, and can be cooled by a cooling medium in the supply system. Engine driven oil-free compressor.

Images