JP2002322992A - Cooling system for engine-driven oil-free screw compressor - Google Patents

Abstract

(57) [Problem] To provide a compressor cooling device having a simple configuration, a small number of parts, easy assembly and maintenance, and high reliability. A recovery circuit provided with a circulation pump.
And the water supply circuit 31 through a radiator 40, and both the coolant that has cooled the compressor body 10 (11, 12) and the coolant that has cooled the engine 20 are introduced into the radiator 40 through the recovery circuit 32. I do. After cooling the coolant by heat exchange with the radiator 40, the coolant is again introduced into both the compressor body 10 (11, 12) and the engine 20 via the water supply circuit 31,
The compressor body 10 (11, 12) and the engine 20 are cooled by one cooling device 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooling device for an engine-driven oil-free screw compressor.

[0002]

2. Description of the Related Art In general, an oil-cooled screw compressor, which is a screw compressor, uses a cooled oil in a working space to remove compression heat generated in a process of compressing intake air by a compressor body. Injects and discharges a gas-liquid mixed fluid of compressed air and oil from the discharge port of the compressor body, separates this gas mixed fluid into compressed air and oil, and uses compressed air as an air working machine etc. The oil is cooled by an oil cooler and supplied again into the working space of the compressor body.

However, even if an oil-cooled screw compressor is separated into compressed air and oil by a separator, it is extremely difficult to completely remove the oil from the compressed air. It cannot be used in an air working machine that dislikes the above or in a field such as food production where compressed air containing oil cannot be used.

[0004] Therefore, in an air working machine which refuses to supply compressed air containing oil, or in the field of food production where compressed air containing oil cannot be used, for example, an oil-free screw which does not inject oil into the working space of the compressor body. A compressor is used.

In this oil-free screw compressor, the compressor body 10 (11, 12) is cooled by the compressor body 1 (1).
0 (11, 12) is formed by forming a water jacket serving as a coolant flow path and introducing a coolant into the water jacket. Therefore, the compression provided with such a compressor body 10 (11, 12) is performed. In the machine, a water supply circuit 36 for introducing a coolant into the water jacket of the compressor body 10 (11, 12), and a recovery for collecting the coolant after passing through the water jacket and cooling the compressor body. The circuit 37, the recovery circuit 37
The radiator 40a supplies the coolant recovered through the water supply circuit to the compressor body 10 (11, 12) via the above-described water supply circuit 36, while cooling the coolant recovered by heat exchange, and the respective circuits 36, 37. And a cooling device 1a of the compressor main body provided with a circulation pump 50a for generating a circulation flow in a coolant circulation system including a radiator 40a and the like.

Also, such a compressor body 10 (11, 11)
12) is provided with a cooling device 1b for cooling the engine 20, and a water supply circuit 38 for supplying a coolant to a water jacket of the engine 20;
The coolant that has cooled the engine 20 is supplied to the radiator 40b.
A cooling circuit 1b for collecting the coolant, a radiator 40b for cooling the coolant, and a circulating pump 50b for generating a circulating flow of the coolant.

In FIG. 11, reference numeral 70 denotes a cooling device for cooling the lubricating oil supplied to the compressor body 10 (11, 12). (11, 12) Gears provided in the speed increasing device for transmitting to the rotors, timing gears for regulating the rotation timing of the two male and female rotors, bearings of the rotor shaft, etc., where lubricating oil needs to be supplied. The lubricating oil is supplied to the lubricating part (hereinafter, referred to as “lubricated part”) to lubricate each part. The lubricating oil is stored in the oil tank 72, the lubricating oil cooler 71 ′, and the lubricating oil. An oil supply circuit 73 for introducing oil to the lubricated parts of the compressor body 10 (11, 12), a collecting circuit 74 for collecting the lubricating oil supplied to the lubricated parts into the oil tank 72 described above, and these circuits; Radiier Data 71 'and oil tank 72
An oil pump 75 is provided for circulating the lubricating oil in the lubricating oil circulation system formed as described above.

Further, reference numeral 100 'in FIG. 11 denotes an aftercooler for cooling the compressed air discharged from the compressor body. When the compressed air is cooled by the aftercooler, water vapor contained in the compressed air is condensed. Generates drain. A drain collector 200 is provided on the downstream side of the aftercooler, and the drain collector 200 collects the drain and discharges the drain to the outside to dehumidify the compressed air supplied to the consumer side.

[0009]

In the cooling device for an engine-driven oil-free screw compressor having the above-described structure, a cooling device 1a for the compressor body 10 (11, 12) and a cooling device 1a for the engine 20 are provided. Radiators 40a, 40b and circulating pumps 50a, 50b for each cooling device 1a, 1b.
b, parts that make up each cooling device 1a, 1b, such as piping, are required.

Therefore, the structure of the entire cooling device becomes complicated, the reliability against failure and the like is reduced, the number of parts is increased, the design, assembly, maintenance, and the like are complicated, and the entire compressor is enlarged.

[0011] Such an increase in the number of parts leads to an increase in the weight of the entire compressor, and also results in an increase in the compressor body 10 (1).
Since it is necessary to use a coolant for each of the cooling devices 1a and 1b for the 1, 12) and the engine 20, the amount of use of the coolant increases and the weight increases accordingly. In addition, each cooling device 1a, 1b
It is necessary to replenish and replace the coolant every time, and the maintenance work becomes complicated.

An object of the present invention is to solve the above-mentioned drawbacks in the prior art, and by simplifying the structure of a cooling device for a compressor, weight reduction due to a reduction in the number of parts can be achieved. An object of the present invention is to provide a compressor cooling device which can simplify assembly and maintenance work and has high reliability against breakdowns and the like.

[0013]

In order to achieve the above object, a cooling device for an engine-driven oil-free screw compressor according to the present invention comprises a water compressor provided in a compressor body (11, 12) and an engine (20). A water supply circuit 31 for introducing a coolant into the jacket;
(11, 12) and a recovery circuit 32 for recovering the coolant that has passed through the water jacket of the engine 20 are communicated via a radiator 40 to form a coolant circulation system, and a circulation for generating a coolant circulation flow. A pump 50 is disposed in the coolant circulation system (claim 1).

The compressor body 10 (11, 12) and the engine 20 have coolant inlets 101 (111), 21 and outlets 102 (122), 22 communicating with the water jacket, respectively. Body 1
The coolant supply port 31 (111) of the engine 20 communicates with the coolant supply port 101 (111) of the engine 20, and the coolant discharge port 102 (122) of the compressor body 10 communicates with the coolant introduction port 21 of the engine 20. The discharge port 22 may communicate with the recovery circuit 32 so that the compressor body 10 and the engine 20 may be arranged in series (claim 2: see FIGS. 1 and 2).

In this case, when the compressor body 10 is composed of two compressor bodies 11 and 12 having a low pressure stage and a high pressure stage, the coolant inlet 111 of the low pressure stage compressor body 11 is connected to the water supply circuit. 31 and a coolant outlet 112 of the compressor body 11 at the low pressure stage communicates with a coolant inlet 121 of the compressor body 12 at the high pressure stage, and a coolant outlet 122 of the compressor body 12 at the high pressure stage is connected to the engine. The low-pressure stage compressor body 11, the high-pressure stage compressor body 12, and the engine 20 may all be arranged in series, communicating with the coolant inlet 21 of the engine 20 (claim 3:
(See FIG. 2).

Similarly, when the compressor body 10 is composed of two compressor bodies 11, 12 having a low-pressure stage and a high-pressure stage, the compressor bodies 11, 1 at the low-pressure stage and the high-pressure stage are also provided.
2 are connected to the water supply circuit 31 and the coolant outlets 112, 12 of the compressor bodies 11, 12 at the low pressure stage and the high pressure stage.
2 is the coolant inlet 21 of the engine 20
The engine 20 may be connected in series to the compressor body 10 in which the compressor body 11 of the low-pressure stage and the compressor body 12 of the high-pressure stage are arranged in parallel.
(See FIG. 3).

In these configurations, the coolant that has passed through the radiator 40 is supplied to the compressor body 10 (1).
A bypass circuit 33 for introducing the fuel into the engine without passing through (1, 12) can be provided (Claim 5). Further, a flow regulating valve 60 can be provided in the bypass circuit 33 (Claim 6; FIG. 2).

The cooling device 1 of the present invention can not only connect the compressor body 10 and the engine in series as described above, but also connect the compressor body 10 and the engine 20 in parallel. In this case, both the coolant inlet 101 (or 111, 121) of the compressor body 10 and the coolant inlet 21 of the engine 20 are connected to the water supply circuit 3.
1, and both the coolant discharge port 102 (or 112, 122) of the compressor body 10 and the coolant discharge port 22 of the engine 20 communicate with the recovery circuit 32 (claim 7).

In this case, the compressor body 10 is composed of two compressor bodies 11, 12 consisting of a low pressure stage and a high pressure stage.
The water supply circuit 31 is connected to the coolant inlets 111, 112 of the compressor bodies of the low-pressure stage and the high-pressure stage.
And the coolant outlets 112, 122 of the compressor bodies 11, 12 in the low-pressure stage and the high-pressure stage, respectively.
May be communicated to the recovery circuit 32 (claim 8: see FIG. 4).

Further, in the cooling device 1 having the above-described structure, when the coolant is in a low temperature state, the compressor body 1
0 (11, 12) and / or the amount of coolant introduced into the engine 20 after passing through the radiator 40 is reduced, or the compressor body 10 (11, 12) and / or the engine 20
A bypass valve 35 for stopping the introduction of coolant after passing through the radiator 40 to the
A bypass circuit 34 may be provided which is opened and closed by the switch (see claim 9: FIGS. 6 to 9).

Further, an oil cooler 71 for exchanging heat with the coolant circulating in the circulation system as a cooling medium is provided at any position in the coolant circulation system, for example, in the supply circuit 31. The cooling device 1 that can also perform cooling of the lubricating oil by communicating with an introduction circuit that introduces the lubricating oil of the compressor body 10 (11, 12) can be configured (claim 10: FIG. 5).

Similarly, an aftercooler 10 for exchanging heat with the coolant as a cooling medium in the coolant circulation system.
0, 100 may be provided, and introduction circuits 90, 91 for introducing the compressed air discharged from the compressor body 10 (11, 12) may be connected to the aftercoolers 100, 100 (claim 11: FIG. 6). reference).

Further, an after-warmer 110 for exchanging heat with the coolant circulating in the circulation system as a heating medium is provided in the coolant circulation system.
10 may be configured to communicate with an introduction circuit for introducing the compressed air that has passed through the aftercoolers 100, 100, and a drain collector 200 may be disposed in the introduction circuits of the aftercoolers 100, 100 and the after-warmer 110. Item 12: See FIG. 8).

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described below with reference to the accompanying drawings.

The cooling device 1 of the present invention is divided into cooling devices 1a and 1b (FIG. 11) for the compressor body 10 (11, 12) and for the engine 20 in the prior art.
) Is configured as a device common to both the compressor body 10 (11, 12) and the engine 20, so that main components such as the radiator 40 and the circulation pump 50 are cooled by the compressor body 10 (11, 12). The cooling device 1 shown in FIG. 1 has a water supply circuit for introducing a coolant to the compressor body 10 and the engine 20 by commonly using the cooling device and the cooling of the engine 20. 31, a recovery circuit 32 for introducing the coolant that has cooled the compressor body 10 and the engine 20 to a radiator 40, which will be described later, and is disposed between the supply circuit 31 and the recovery circuit 32,
A radiator 40 for communicating the two, and the recovery circuit 32
It comprises a circulation pump 50 provided therein.

In this embodiment, the compressor body 10 is provided with a water jacket for introducing a coolant, and an inlet 101 for introducing the coolant into the water jacket, and a coolant passing through the water jacket. An outlet 102 for discharging is provided.

Similarly, a water jacket for introducing a coolant is formed in the engine 20 which is a driving source of the compressor body 10, and an introduction port 21 for introducing the coolant into the water jacket, and the water jacket. A discharge port 22 for discharging the coolant that has passed through the jacket is provided.

A coolant discharge port 102 provided in the compressor body 10 communicates with a coolant inlet port 21 provided in the engine 20 so that the coolant can be sequentially introduced in the order of the compressor body 10 and the engine 20. Piping.

The compressor body 1 thus communicated with the compressor body 1
For the engine 0 and the engine 20, one end of the above-described water supply circuit 31 is communicated with a coolant introduction port 101 of the compressor body 10 to introduce the coolant, and the recovery circuit 32 is connected to a coolant discharge port 22 provided in the engine 20. When the coolant is circulated in the coolant circulation system, the coolant is first introduced into the compressor main body 10 to cool it, and then introduced into the engine 20 to be cooled. Is further cooled, introduced into the radiator 40, cooled by heat exchange, and introduced again into the compressor body 10 via the water supply circuit 31.

In any of the circuits constituting the coolant circulation system, a circulation pump 50 for generating a coolant flow in the order described above is provided.

In the embodiment shown in FIG. 1, the circulation pump 50 is connected to a recovery circuit 32 that communicates between a coolant discharge port 22 provided in the engine 20 and a radiator 40.
Although an example provided inside is shown, a recovery circuit 32 (water supply circuit 31) communicating between the outlet 102 of the compressor body 10 and the inlet 21 of the engine 20, and an inlet of the radiator 40 and the compressor body 10 are provided. The arrangement position of the circulation pump 50 is not limited to the embodiment shown in FIG. 1 as long as it generates a flow in the circulation system of the coolant, such as a water supply circuit communicating with the space 101 and a water jacket of the engine 20.

In the above-described embodiment, the flow of the coolant is controlled by the radiator 40, the compressor body 10, the engine 20,
Although the order of the radiators 40 is used, the radiators 40,
The circulation may be performed in the order of the engine 20, the compressor body 10, and the radiator 40.

As the circulating pump 50, a water pump or the like of the engine 20, which is used in the engine cooling device 1b described as the related art, can be diverted as it is. During the operation of the compressor, the coolant can be reliably circulated. However, this circulation pump may be separately provided as long as it can circulate the coolant.

The cooling device 1 for an engine-driven oil-free screw compressor configured as described above has a radiator 4
The cooling pump 50 and the circulation pump 50 can be used in common for cooling the compressor body 10 and for cooling the engine 20, and the configuration of the cooling device can be simplified, so that the size and weight of the cooling device can be reduced.

The cooling of the compressor body 10 and the engine 2
By performing the cooling of 0 by the common cooling device 1, the amount of coolant to be used can be reduced, which contributes to the weight reduction of the entire device, and maintenance such as replenishment and replacement of the coolant is performed in one operation. be able to.

Further, by using the circulating pump 50, for example, by diverting an engine water pump or the like which operates with the rotation of the engine 20, the circulating pump always operates with the start of the engine 20. Therefore, the operation is reliable, and operation failures such as overheating due to defective circulation of the coolant hardly occur.

In the embodiment shown in FIG. 1, a screw compressor comprising a single-stage compressor body 10 has been described. However, as shown in FIG. Is a high-pressure stage and a low-pressure stage.
The present invention can also be used for a screw compressor having the compressors 1 and 12, and can also be used for a screw compressor having a compressor body of three or more stages.

A cooling device 1 for a screw compressor shown in FIG.
Communicates the radiator 40 with an inlet 111 provided in the low-pressure stage compressor body 11, and connects the low-pressure stage compressor body 11
Is connected to a coolant inlet 121 provided in the high-pressure compressor body 12 and a coolant outlet 122 provided in the high-pressure compressor body 12 is connected to the engine 20. The coolant cools the compressor body 11 at the low pressure stage and the coolant cools the compressor body 12 at the high pressure stage.
, And then the engine.

In the embodiment shown in FIG. 2, a bypass circuit 33 is provided which branches off the above-described water supply circuit 31, and this bypass circuit 33 communicates with the coolant inlet 21 provided in the engine 20. By doing so, the coolant before passing through the compressor body 10 (11, 12) can be partially introduced directly into the engine 20, and the temperature of the coolant introduced into the engine 20 can be adjusted.

In the embodiment shown in FIG. 1, the bypass circuit 33 is further provided with a flow control valve 60 so that the engine 2 can be moved without passing through the compressor body 10 (11, 12).
The amount of coolant introduced to zero can be adjusted.

However, the bypass circuit 33 and the flow control valve 60 are not essential in the cooling device 1 of the present invention, and all the coolant from the radiator 40 is introduced into the compressor body 10 (11, 12). Need not be provided.

Further, in the example shown in FIG. 2, an example has been described in which the coolant after cooling the compressor body 11 at the low pressure stage is introduced into the compressor body 12 at the high pressure stage. The high-pressure stage compressor main body 12 is arranged in parallel as shown in FIG. 3, and the coolant that has passed through the radiator 40 is supplied to the low-pressure stage and high-pressure stage compressor main bodies 11, 1.
2, the engine 20 may be arranged in parallel with the compressor main body 11 of the low-pressure stage and the compressor main body 12 of the high-pressure stage, as shown in FIG. , The coolant passing through the radiator 40 may be introduced at the same time.

Further, in the examples shown in FIGS. 1 to 4, it has been described that the cooling device 1 only cools the compressor main body 10 (11, 12) and the engine 20, but as shown in FIG. In the cooling device 1 of the invention, the compressor body 10 (1
A cooling device 70 for lubricating oil, which incorporates an oil cooler 71 for cooling lubricating oil supplied to the gear case and the like of (1) and (12).
The lubricating oil is cooled by a coolant circulating in the cooling device of the present invention, for example, by incorporating an oil cooler 71 in a lower water tank of the radiator 40. With such a configuration, the oil cooler 71 'for the lubricating oil, which had to be separately provided in the cooling device described as the related art, can be eliminated. If a cooling fan is provided, this can be omitted.In addition, for a configuration in which an oil cooler for lubricating oil is blown by a common cooling fan with a radiator provided in another cooling device, this cooling fan is used. Can be reduced in size, and downsizing of the entire device can be achieved.

Each of the circuits constituting the cooling device may be provided with a filter 80 for removing foreign matter mixed in the coolant at any one of the positions.

Next, another embodiment of the present invention will be described with reference to FIG. In the embodiment shown in FIG. 6, an aftercooler 10 for cooling the compressed air discharged from the compressor body 10 (11, 12) in the cooling device 1 of the present invention.
0, 100 are provided, and the compressed air discharged from the compressor body 10 (11, 12) is cooled by the coolant circulating in the cooling device 1, and the drain is collected by the drain recovery unit 200 and discharged outside the machine. Thus, the compressed air dehumidified can be supplied to the consumer side.

The after-cooler mentioned here is not only for cooling the compressed air supplied to the consuming side, but also for a screw compressor having a plurality of stages of compressor bodies 11, 12 as shown in FIG. Is a low-pressure stage compressor body 1
2 includes a means for cooling the compressed air discharged from the compressor 2 before introducing the compressed air into the compressor main body 11 of the high-pressure stage.

Further, in the embodiment shown in FIG. 6, a temperature-sensitive bypass valve 35 provided in the recovery circuit 32 includes:
A bypass circuit 34 is provided for communicating between the recovery circuit 32 and the supply circuit 31 via the temperature-sensitive bypass valve 35 without passing through the radiator 40.

The temperature-sensitive bypass valve 35 is configured such that a built-in valve body is operated by a coolant temperature to open and close the passage. In the embodiment shown in FIG. When the temperature of the coolant is low, the circuit (recovery circuit 32 downstream of the temperature-sensitive bypass valve 35) communicating with the radiator 40 is throttled or closed and the bypass circuit 34 is opened to stop the introduction of the coolant to the radiator 40, or the radiator 40 To reduce the amount of coolant introduced into the compressor body 10
(11, 12) and the engine 20 are prevented from being supercooled.

In the embodiment shown in FIG. 6, both the compressor main body 10 (11, 12) and the engine 20 are configured not to introduce the coolant cooled through the radiator 40. The coolant that has passed through the radiator 40 stops its introduction only to one of the compressor body 10 (11, 12) and the engine 20,
Alternatively, the amount of introduction may be reduced. For example, in the example shown in FIG. 7, a bypass circuit 34 is provided between the coolant introduction port 21 and the recovery circuit 32 of the engine 20 via a temperature-sensitive bypass valve 35, FIG. 8 shows an example in which the introduction of the coolant to the engine 20 is stopped only when the temperature of the coolant is low, or the amount of the introduced coolant is reduced to prevent the engine 20 from being overcooled. In the example shown, by connecting the bypass circuit 34 between the supply circuit 31 and the downstream of the coolant outlet 102 of the compressor body 10 via the temperature-sensitive bypass valve 35, the coolant is connected to the compressor body 10 when the temperature is low. The supercooling of the compressor body 10 can be prevented by reducing the amount of the introduced coolant without introducing the coolant. Forms.

In this embodiment, the oil-free screw compressor includes not only two compressor bodies 11, 12 of a low pressure stage and a high pressure stage as shown in FIG.
As shown in FIGS. 7 to 9, a compressor having one compressor body 10 may be used.
The process may be performed only on one of the low-pressure stage and high-pressure stage compressor bodies 11 and 12. Further, the above-described bypass circuit may be combined with not only the cooling device having the configuration shown in FIG. 6 but also the cooling device shown in FIG. 1 and other cooling devices as shown in FIGS.

In the cooling device 1 of the present invention configured as described above, not only the size of the entire device and the simplification of piping can be achieved as in the case of the first embodiment, but also the compressor body 1
By cooling the compressed air discharged from 0 (11, 12) using the coolant of the cooling device 1 of the present invention,
The cooling efficiency is higher than the case of cooling the compressed air by air cooling (see FIG. 9), and the cooling fan for the aftercooler is omitted or the cooling fan is reduced in size as in the case shown in FIG. Can be

FIG. 10 shows another embodiment of the present invention. In the example shown in FIG. 10, in addition to the configuration of FIG. 6, the after-warmer 11 is further provided in the cooling device 1 of the present invention.
0 is provided, and the other configuration is the same as that of the embodiment shown in FIG. The after-warmer 110 dries the compressed air dehumidified by the after-cooler 100 by heating it with the heat of the coolant to lower the relative temperature of the compressed air, and before being introduced into the radiator 40 as shown in FIG. The coolant in the recovery circuit, which is relatively hot, and the compressor body 10 (11, 1)
2) A device for exchanging heat with the compressed air discharged from the device.

As described above, the compressor body 10 (11, 1)
2) By introducing the coolant used for cooling the engine 20 into the after-warmer 110, the compressed air is heated by the coolant heated by heat exchange with the compressor body 10 (11, 12) and the engine 20. Thus, the compressed air can be suitably dried.

[0054]

According to the structure of the present invention described above, the structure of the compressor can be simplified, the weight can be reduced due to the reduction in the number of parts, the assembly and maintenance can be easily performed, and a highly reliable compressor cooling device can be provided. We were able to.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a cooling device of the present invention.

FIG. 2 is a schematic explanatory view of another cooling device of the present invention.

FIG. 3 is a schematic explanatory view of another cooling device of the present invention.

FIG. 4 is a schematic explanatory view of another cooling device of the present invention.

FIG. 5 is a schematic explanatory view of another cooling device of the present invention.

FIG. 6 is a schematic explanatory view of another cooling device of the present invention.

FIG. 7 is a schematic explanatory view of another cooling device of the present invention.

FIG. 8 is a schematic explanatory view of another cooling device of the present invention.

FIG. 9 is a schematic explanatory view of another cooling device of the present invention.

FIG. 10 is a schematic explanatory view of another cooling device of the present invention.

FIG. 11 is a schematic explanatory view showing a conventional cooling device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling device 1a Cooling device (for compressor main body) 1b Cooling device (for engine) 10 Compressor main body 101 Coolant inlet 102 Coolant outlet 11 Low-pressure stage compressor main body 111 Coolant inlet (low-pressure stage compressor main body) 112) Coolant outlet (for low-pressure compressor body) 12 High-pressure compressor body 121 Coolant inlet (for high-pressure compressor body) 122 Coolant outlet (for high-pressure compressor body) ) 20 Engine 21 Coolant inlet (for engine) 22 Coolant outlet (for engine) 31 Water supply circuit 32 Recovery circuit 33 Bypass circuit 34 Bypass circuit 35 Bypass valve 36 Water supply circuit (for cooling device of compressor body) 37 Recovery Circuit (for cooling device of compressor body) 38 Water supply circuit (for cooling device of engine) 39 times Circuit (for cooling system of engine) 40, 40a, 40b Radiator 50, 50a, 50b Circulating pump 60 Flow control valve 70 Cooling device for lubricating oil 71 Oil cooler 71 'Oil cooler 72 Oil tank 73 Oil supply circuit 74 Oil drain circuit 75 Oil Pump 80 Filter 90, 91 Compressed air introduction circuit 100, 100 'Aftercooler 110 Afterwarmer 200 Drain collector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F04C 29/04 F04C 29/04 H N 29/10 29/10 A

Claims (12)

[Claims] A radiator includes a water supply circuit that introduces coolant into a water jacket provided in a compressor body and an engine, and a recovery circuit that collects coolant that has passed through a water jacket of the compressor body and the engine. A cooling device for an engine-driven oil-free screw compressor, wherein a circulating pump for generating a circulating flow of the coolant is arranged in the circulating system for the coolant while forming a circulating system of the coolant by communicating with the cooling medium. . 2. The compressor body and the engine each include a coolant inlet and a discharge port communicating with the water jacket, and the coolant supply circuit communicates with the coolant inlet of the compressor body, and The cooling device for an engine-driven oil-free screw compressor according to claim 1, wherein a coolant discharge port of the main body communicates with a coolant introduction port of the engine, and a coolant discharge port of the engine communicates with the recovery circuit. 3. The compressor body includes two compressor bodies each including a low-pressure stage and a high-pressure stage. The compressor body of the low-pressure stage compressor communicates with a coolant introduction port to the water supply circuit. 3. A coolant outlet of the high-pressure stage compressor body is communicated with a coolant inlet of the high-pressure stage compressor body, and a coolant outlet of the high-pressure stage compressor body is communicated with a coolant inlet of the engine. Cooling system for engine-driven oil-free screw compressor. 4. The compressor main body comprises two compressor main bodies comprising a low-pressure stage and a high-pressure stage, and both coolant introduction ports of the low-pressure stage and the high-pressure stage compressor body are respectively connected to the water supply circuit. 2. The cooling device for an engine-driven oil-free screw compressor according to claim 1, wherein both the low pressure stage and the high pressure stage have a coolant discharge port of a compressor body communicating with a coolant introduction port of the engine. 5. The engine drive according to claim 2, further comprising a bypass circuit for introducing the coolant that has passed through the radiator into the engine without passing through the compressor body. Oil-free screw compressor cooling system. 6. The cooling device for an engine-driven oil-free screw compressor according to claim 5, wherein a flow regulating valve is provided in said bypass circuit. 7. The compressor body and the engine each include a coolant inlet and a discharge port communicating with the water jacket, and both the coolant inlet of the compressor body and the coolant inlet of the engine are provided. The cooling of the engine-driven oil-free screw compressor according to claim 1, wherein both a coolant discharge port of the compressor body and a coolant discharge port of the engine communicate with the recovery circuit while communicating with a water supply circuit. apparatus. 8. The compressor body includes two compressor bodies including a low pressure stage and a high pressure stage, and the water supply circuit communicates with coolant inlets of the low pressure stage and the high pressure stage compressor bodies, respectively. 8. The cooling device for an engine-driven oil-free screw compressor according to claim 7, wherein all of the coolant discharge ports of the low-pressure stage and the high-pressure stage compressor body communicate with the recovery circuit. 9. When the coolant is in a low temperature state, the amount of coolant introduced into the compressor body and / or the engine after passing through the radiator is reduced, or the compressor body and / or
The engine-driven oil-free screw according to any one of claims 1 to 8, further comprising: a bypass valve that stops introduction of coolant after passing through the radiator to the engine; and a bypass circuit that is opened and closed by the bypass valve. Compressor cooling system. 10. An introduction circuit for providing an oil cooler for exchanging heat with the coolant circulating in the circulation system as a cooling medium in the circulation system of the coolant, and introducing lubricating oil for the compressor body to the oil cooler. The cooling device for an engine-driven oil-free screw compressor according to any one of claims 1 to 9, wherein: 11. An aftercooler for exchanging heat with the coolant circulating in the circulation system as a cooling medium is provided in the coolant circulation system, and the compressed air discharged from the compressor body is introduced into the aftercooler. The cooling device for an engine-driven oil-free screw compressor according to any one of claims 1 to 10, wherein a circuit is connected. 12. An introduction circuit for providing an after-warmer for exchanging heat with the coolant circulating in the circulation system as a heating medium in the circulation system of the coolant, and introducing compressed air passed through the after-cooler to the after-warmer. The cooling device for an engine-driven oil-free screw compressor according to claim 11, wherein a drain recovery device is disposed in an introduction circuit between the aftercooler and the afterwarmer.