JP2000045936A - Water circulation method for water circulation type compressor and water circulation circuit for conducting the same method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool compressed air sent from a receiver tank to condense the water vapor in the compressed air into drain, and to recover and supply the drain to the compressor main body, thereby preventing the water in a circulation system from decreasing. SOLUTION: In a water circulating compressor 10, as cooling means for cooling the compressed air sent from a receiver tank 50, a freezing type drier 20 that cools the compressed air to remove the drain generated and dry the compressed air is provided. One end of a recovery conduit 11 communicates with this freezing type drier 20 and the other end thereof communicates with a compression operation space after intake air is contained in a compressor main body 30 via a communication hole 37, thereby constituting a water circulation circuit. This recovery conduit 11 recovers the drain generated in the freezing type drier 20 and supplies it to the compression operation space after the intake air is contained in the compressor main body 30. Accordingly, lack of water due to being discharged along with the compressed air to the outside of the device is compensated by recovering the drain.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water circulating method and a water circulating circuit for a water circulating compressor. More specifically, compressed air sent to a demand section such as an air working machine is used after cooling as required. The present invention relates to a water circulating method and a water circulating circuit for collecting condensed water generated during cooling of the compressed air, so-called drain, and circulating and supplying the collected drain to the compressor body.

[0002]

2. Description of the Related Art Conventionally, in a compressor, the temperature of compressed air or the like due to heat generated by the compression of air is prevented from becoming high, the gap in a compression working space is sealed, and the lubrication of a sliding portion is ensured. For cooling, sealing, and lubrication, an oil circulation type so-called oil-cooled compressor for injecting lubricating oil into a compression working space during compression is generally used.

In such an oil circulation type compressor, lubricating oil is injected into a compression working space of the compressor main body from an oil supply port provided in the compressor main body. After the air sucked in the inside is compressed, the air is discharged from the discharge port together with the oil, introduced into a receiver tank provided with an oil separating element, and separated into oil and compressed air in the receiver tank.

[0004] The compressed air separated from the oil in the receiver tank in this way is supplied to a demand section such as an air working machine, and the oil separated in the receiver tank is again supplied from an oil supply port of the compressor body. The oil is supplied into the compression working space and circulates the oil.

[0005] As described above, in the oil circulation type compressor, the oil contained in the compressed air is separated and removed through the oil separation element provided in the receiver tank and supplied to the demand section. However, since the oil in the compressed air cannot be completely separated or removed even by the oil separation element, an air working machine that dislikes the supply of compressed air containing the oil, and mixing of the oil is not allowed at all, such as food production. In this field, an oil-cooled compressor cannot be used.

[0006] Therefore, a water circulation type compressor that injects water into a compression working space when compressing intake air instead of oil used for cooling, sealing, lubrication, etc. has been proposed and used.

In this water circulating compressor, after the air sucked in the compression working space of the compressor main body is compressed, the compressed air is discharged from the discharge port together with the water supplied to the compressor main body, and is discharged from the receiver tank. Will be introduced. In the receiver tank, the introduced compressed air and water are separated, the water circulates through a water circulation system supplied to the compressor body, and the compressed air separated from the water is supplied to a demand unit. However, the water that can be separated in this receiver tank is only liquid, and the water contained in the compressed air as water vapor cannot be separated.

Therefore, water that is supplied to the compressor body and evaporates when exchanging heat with the compression heat of the intake air or water that is discharged from the compressor body and evaporates when stored in the receiver tank is converted into steam. The water is supplied to the demand section together with the compressed air, and the water supplied to the demand section as steam is reduced from the water circulation system of the water circulation type compressor.

Further, when the humidity of the air sucked into the compressor body is high, the water vapor contained in the suction air is condensed by the compression to become a drain, which is discharged from the compressor body into the receiver tank, or the temperature in the receiver tank becomes lower. The water in the receiver tank increases due to the dew point or less and the water vapor in the compressed air condensing in the receiver tank.

As a result, such a water circulating compressor is complicated to manage and handle, for example, it is necessary to always keep the amount of water in the circulating system within a certain range.

To solve such a problem, FIG.
As shown in the figure, a refrigeration dryer 20 for dehumidifying and drying the compressed air supplied from the air compressor 30 'and a drain tank 20' for storing the drain generated when the refrigeration dryer dehumidifies and dries the compressed air. There is disclosed a water circulating compressor in which the drain stored in a drain tank 20 'is circulated to a suction pipe of an air compressor 30' to prevent water from being reduced (Japanese Patent Application Laid-Open No. H7-180663).

[0012]

In the water circulating compressor described in Japanese Patent Application Laid-Open No. H7-180663, an air compressor 3 is provided by an aftercooler 22 and a refrigeration dryer 20.
A drain tank 20 ′ for temporarily storing the collected drain, in order to collect the drain from the compressed air discharged from 0 ′ and supply the collected drain to the air compressor 30 ′; 'And the air compressor 30'
A water supply conduit 76 is provided for communication between them. The water supply line 76 is provided with a solenoid valve 13 that is opened and closed periodically by the timer mechanism 12, and is configured to supply the drain to the water supply line 76 regularly by the operation of the timer mechanism 12 and the solenoid valve 13. ing.

Therefore, the water circulation type compressor 10
, The drain tank 20 ′, the timer mechanism 1
2. Increasing the number of parts such as the solenoid valve 13 and the water supply line 76 complicates the configuration and increases the manufacturing cost.

The drain tank 20 'is provided with an air space above the drain tank 20' so that the space above the drain tank 20 'is reduced in order to prevent the drain from flowing back to the aftercooler 22 and the refrigeration dryer 20. It communicates with the suction line of the compressor 30 '. Therefore, the demand section 90 is connected via the upper space of the drain tank 20 '.
A part of the compressed air supplied to the air compressor 30 ′ is introduced into the suction side of the air compressor 30 ′, which causes a decrease in the air pressure and the amount of the compressed air supplied to the demand unit 90, and the air once compressed is sucked. Since it is returned to the side and returned to the atmospheric pressure state, the power required for compression is lost, and furthermore, as described above, piping for reducing the pressure in the upper space of the drain tank 20 'is required, and the entire apparatus is complicated. , Increase in size.

Further, in the above-mentioned water circulation type compressor, since the pressure in the drain tank 20 'is reduced,
The drain collected in the drain tank 20 ′ is also depressurized, and the supply of the drain to the air compressor 30 ′ is negative through a water supply pipe 76 and a suction pipe 75 connected to the suction side of the air compressor 30 ′. It must be performed from the suction side of the compressor 30 'which is in pressure. Therefore, the collected drain is supplied into the air compressor 30 'together with the intake air, and the amount of intake air corresponding to the volume of the drain is reduced. As a result, the amount of intake air per unit power of the water circulating compressor 10 is reduced. That is, work efficiency is reduced.

That is, when the drain is introduced into the air compressor 30 'together with the intake air, if the temperature of the drain is higher than that of the intake air, the intake air is heated by the drain and expanded to reduce the amount of intake air. I do.

Further, the boiling point is lowered in the suction line 75 due to the negative pressure. When drain is supplied to the suction line 75, the drain boils and evaporates. May decrease.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and uses a relatively simple structure to remove the drain generated by the cooling means between the compressor body of the water circulation type compressor and the receiver tank. By supplying the water to the water circulation system, it is possible to prevent a decrease in water in the water circulation system, and therefore, it is possible to provide a water circulation compressor that does not need to separately supply water to the water circulation system. It is an object to provide a water circulation method and circuit.

Another object of the present invention is to provide a water circulation circuit of a water circulation type compressor which can achieve the above object without reducing the operation efficiency of the water circulation type compressor.

[0020]

In order to achieve the above object, a method of circulating water in a water circulating compressor 10 according to the present invention comprises the steps of: inhaling and compressing air; discharging the compressed air together with water supplied to a compressor body 30; Water and compressed air are separated in the receiver tank 50, and the water is supplied to the compressor body 30;
In the step of circulating water between the compressor body 30 and the receiver tank 50, the compressed air sent from the receiver tank 50 is cooled, and the water vapor in the compressed air is condensed to form a drain. And recovering the collected drain to the compressor body 30 (claim 1).

The water circulation circuit of the water circulation type compressor 10 according to the present invention communicates with a compressor body 30 for compressing intake air and discharging water supplied with the compressed air, and a discharge port of the compressor body 30. And a receiver tank 50 for introducing compressed air and water discharged from the compressor body 30 to separate and store the compressed air and water, and the water circulates between the compressor body 30 and the receiver tank 50. In the water circulating compressor 10 having a circuit for cooling the compressed air sent from the receiver tank 50,
A means for cooling compressed air (refrigerating dryer 20 and / or aftercooler 22) for condensing water vapor in the compressed air to form a drain, and collecting the drain generated by the cooling means. 30 is provided with a circuit 11 for supplying the circuit 30 (Claim 2: FIGS. 1 to 5).

Preferably, the circuit for supplying the collected drain to the compressor main body 30 is configured to supply the drain to the compression working space after the intake of the compressor main body 30 is closed (claim 3: 1 to 5).

The circuit for supplying drain to the compressor body has one end connected to the cooling means (refrigeration dryer 20 and / or aftercooler 22) and the other end connected to the compressor body 30.
(Claim 4: FIGS. 1 to 3). In this case, preferably, the recovery pipe 11 is provided with a throttle portion 14 formed of, for example, an orifice, a valve, and / or the like. Alternatively, a drain trap 15 that opens the collection pipe 11 when a predetermined amount of drain is collected is provided (claims 5 and 6: FIGS. 1 to 3).

Further, the circuit for supplying the drain to the compressor main body may be replaced with the above-mentioned configuration, and the recovery pipe 11 may have one end connected to the cooling means and the other end connected to the receiver tank.
And a pump for transferring the drain from the cooling means to the receiver tank in the recovery pipe (claim 7: FIG. 4).

Further, the water circulation type compressor 1 of the present invention
The water circulation circuit branches the circuit for supplying the collected drain to the compressor body 30 through the switching valve 81 to form a branch circuit 84 in addition to the above-described configuration, and forms one end of the branch circuit 84 with water circulation. Water level detection means 86 is provided to extend outside the compressor 10 and detect that the water level in the receiver tank 50 has exceeded a predetermined water level, and the switching valve 81 detects water level by the water level detection means 86. According to a signal, the circuit 11 that supplies the collected drain to the compressor body 30 is closed, and one end of the branch circuit 84 is opened (claim 8: FIG. 5).

The water circulation circuit has one end extending outside the water circulation type compressor 10 in addition to the components described above, and the other end serving as an overflow of water in the receiver tank 50. It can communicate with a drain port 54 that opens at a predetermined height position. And
The drain pipe 56 is provided with a drain trap 52 that opens the drain pipe 56 when a predetermined amount of water is collected in the receiver tank 50 so that the water in the receiver tank 50 can be automatically drained. (Claim 9:
1 to 4).

[0027]

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

As shown in FIG. 1, a water circulation circuit of a water circulation type compressor 10 according to the present invention includes a compressor body 30 driven by a drive source (not shown) such as a motor and an engine, and a suction port 32 of the compressor body 30. And a discharge port 34 of the compressor body 30 for opening and closing the compressor, and the compressed air discharged from the compressor body 30 is introduced to separate and store the compressed air and water. Receiver tank 5
0, a water circulation type compressor 10 having a circuit (pipe 76) for circulating water separated in the receiver tank 50 to the water supply port 38 of the compressor body 30, the receiver tank 50, an air working machine, and the like. And a circuit (recovery line 11) for supplying a drain generated by the refrigeration dryer 20 and / or a cooling means including the refrigeration dryer 20 disposed between the compressed air demand sections 90 to the compressor body 30. It is a thing.

In the water circulation circuit of the present invention, the drain collected by the cooling means (refrigeration dryer 20, aftercooler 22) is supplied to the compressor main body 30 without being decompressed. Not only can it be supplied from the suction side of the compressor body 30 via the compressor, but also the drain can be supplied to the compression working space after the intake is closed. Hereinafter, in the present embodiment, an example will be described in which the collected drain is supplied to the compression working space after the intake air is closed without causing a decrease in the operation efficiency of the water circulation type compressor 10.

Here, the compression action space after the intake air is closed means, when the compressor body 30 is provided with a screw rotor as a compression means, for example, the air inside the groove chamber formed by the casing and the screw groove of the screw. Is completed,
The groove chamber refers to the groove chamber from a state where the groove chamber is closed by, for example, an end surface on the suction side of the casing or the like, to a time immediately before the groove chamber communicates with the discharge port. It is configured such that drain can be supplied into the above-mentioned compression action space through a communication port 37 that communicates with the compression action space after being closed.

In FIG. 1 showing an embodiment of the present invention,
Although the communication port 37 is opened in the compression working space closer to the suction side than the water supply port 38, the present invention is not limited to this, and the communication port 37 may be located at any position in the compression working space. It may be opened at the end.

Preferably, the communication port 34 is
It is good to open into the compression working space just before communicating with 4.

In FIG. 1, reference numeral 30 denotes a compressor body which uses water as a cooling medium or the like for compressed air, and a suction port 32 of the compressor body 30 has a known capacity adjustment such as a butterfly type or a diaphragm type. An unloader 40 as an apparatus is provided.

A receiver tank 50 is connected to the discharge port 34 of the compressor body 30 via a discharge pipe 72.

The compressed air introduced into the receiver tank 50 is separated into compressed air and water discharged together with the compressed air and stored in the receiver tank 50.

The compressed air stored in the receiver tank 50 is supplied to a discharge pipe 72 and a refrigeration dryer 20 described later.
The cooling unit is supplied to a demand unit 90 such as a pneumatic working machine (not shown).

The water separated and recovered in the receiver tank 50 is similarly pushed out through a pipe 74 by the pressure of the compressed air stored in the receiver tank 50 and provided in the pipe 74. After being cooled through the cooler 60, the air is again supplied to the water supply port 38 of the compressor body 30, and when the outside air introduced through the suction port 32 and the suction chamber 33 is compressed in the compressor body 30, As a medium for cooling by exchanging heat with the generated heat, it is circulated after lubrication and sealing of each part in the compressor main body 30.

Accordingly, the compressor main body 30, the receiver tank 50, the cooler 60, and the pipeline 72 for connecting the above-mentioned respective devices,
A circulation system for circulating water used as a cooling medium or the like is formed by 76.

In the structure described above, the basic structure of the compressor is the same as that of the known water circulating compressor 10, but the water circulating compressor 10 of the present invention is used.
Is provided with a cooling means for cooling the compressed air sent from the receiver tank 50 in addition to the above-described structure, and drains generated by condensation during cooling by the cooling means.
Recovery line 1 that supplies to the compression action space after the intake of the air has been closed
1 constitutes a part of the water circulation circuit.

In the embodiment shown in FIG. 1, a refrigeration dryer 20 is provided as the cooling means for cooling the compressed air to remove drain generated and drying the compressed air. And the other end to communication port 3
This water circulation circuit is constituted by the recovery pipe line 11 which communicates with the compression working space after the intake of the compressor main body 30 is closed via the compressor 7. Therefore, the collecting pipe 11 collects the drain generated in the refrigeration dryer 20 and collects the drain.
Drain is supplied to the compression action space after the intake of 0 is closed.

The collecting line 11 preferably has a throttle portion 14 for adjusting the flow rate of the compressed air and a drain such as an orifice and a valve, and / or a drain trap 15 provided with a float valve for collecting the drain. Is provided.

Although the configuration shown in FIG. 1 shows a configuration in which both the throttle section 14 and the drain trap 15 are provided in the recovery pipe 11, either the throttle section 14 or the drain trap 15 is provided. Only may be.

Further, the water circulation circuit of the present invention comprises a compressor body 30, a receiver tank 50, a cooler 60, and a discharge pipe 7
When the amount of water in the water circulation system defined by the water supply line 2 and the water supply line 76 exceeds a predetermined amount, a drainage line 56 for draining excess water out of the compressor 10 may be provided.

The drain pipe 56 is provided at a predetermined height position with a drain port 54 formed on the side wall of the receiver tank 50.
One end is connected to the other end, and the other end is
0 outside the aircraft. And the drainage pipe 5
In 6, a drain trap 52 for opening the drainage pipe 56 when a predetermined amount of water is collected by the action of a float valve or the like is provided.

Therefore, when the water level in the receiver tank 50 exceeds a predetermined amount beyond the position of the drain port 54, the water discharged through the drain port 54 is introduced into the drain trap 52, and the water is circulated. It is discharged outside the compressor.

Further, the compressor may be provided with a drainage pipe 77, and the water stored in the compressor main body 30 and the receiver tank 50 when the water circulation type compressor 10 is stopped by the pipeway 77. Can be discharged.

The operation of the water circulating compressor 10 having the water circulating circuit of the embodiment shown in FIG. 1 constructed as described above will be described. The compressor main body 30, the receiver tank 50, the cooler 60 and the above-mentioned devices are connected. Line 7
Water is filled into the water circulation system formed by 2,76,
When the unloader 40 is opened and a power source such as a motor or an engine (not shown) is driven to operate the compressor main body 30, a rotor or the like provided in the compressor main body 30 rotates to suck the compressor main body 30. The air from which dust, dust and the like have been removed by the air filter is introduced into the compression chamber 36 through the opening 32.

In addition to the introduction of the outside air, the water supply port 38
The water in the receiver tank 50 is filled with water in the receiver tank 50 through a water supply pipe 76 communicating with the compression chamber 36 through the compression chamber 36.
The compressed air introduced into the inside and compressed in the compression chamber 36 is discharged from the discharge port 34 together with the water.

The discharge port 34 of the compressor body 30 is connected to a receiver tank 50 through a discharge pipe 72, and the compressed air discharged together with the water is introduced into the receiver tank 50, Then, the compressed air and water are separated and stored in the receiver tank 50 in the separated state.

The water stored in the receiver tank 50 is pressure-fed from the receiver tank 50 via a line 76 by the pressure of the compressed air introduced into the receiver tank 50, and the pressure-fed water is supplied to a water supply line. After being cooled through a cooler 60 provided in the compressor 76, the compressor body 30
Is supplied to the compressor body 30 through a water supply port 38 of the compressor and circulates.

The receiver tank 50 is mounted on the compressor body 30.
Although it separates the compressed air introduced together with the water into water and compressed air, it does not have a means for separating the water vapor in the compressed air. Therefore, the compressed air in the receiver tank 50 includes the compressor main body. Water that is injected into the heat exchanger 30 and evaporates when exchanging heat with the compression heat, and water that is discharged from the compressor main body 30 and evaporates when stored in the receiver tank 50, is included as water vapor.

The compressed air in the receiver tank 50 is introduced into a cooling means such as the refrigeration dryer 20 through a pipe 78, and after being cooled or dried together with the cooling by the cooling means, an air not shown Demand department 9 for working machines, etc.
0 is supplied.

The drain generated by condensing water vapor by cooling the compressed air by the cooling means such as the refrigeration dryer 20 passes through the recovery pipe 11 connected to the refrigeration dryer 20 to the compressor main body 30. Is introduced through the communication port 37 into the compression working space after the intake of the compressor is closed.
The water is introduced into the water circulation system formed between the receiver tank 50 and the receiver tank 50.

As described above, when the refrigeration dryer 20 communicates with the compression chamber 36 of the compressor main body 30 through the recovery line 11, the compressed air sent from the receiver tank 50 is introduced, and the refrigeration dryer has a high pressure. 20, a drain flow is generated toward the compression action space after the intake of the compressor body 30 which is at a low pressure as compared with this,
The drain collected by the refrigeration dryer 20 is preferably introduced into the compression chamber 36 of the compressor body 30. Therefore, the water that has been discharged out of the machine together with the compressed air as water vapor and becomes insufficient is replenished by collecting the drain.

When the drain is introduced into the suction port 32 or the suction chamber 33 of the compressor main body 30 as in the apparatus shown as a conventional example, and the drain is sucked into the compressor main body 30 together with the suction of the compressor main body 30, the compression is performed. The intake air amount of the machine body 30 decreases or power is lost. However, since the introduction of the drain in the present invention is performed in the compression action space after the intake of the compressor body 30 is closed, the introduction of the drain does not affect the intake amount of the compressor body 30. Absent. Therefore, according to the circuit of the present invention, the drain can be collected without reducing the intake air amount per unit power of the compressor main body 30, that is, without lowering the operation efficiency.

Further, if the communication port 37 is opened in the compression working space immediately before communicating with the discharge port 34, the refrigeration dryer 2
Since the pressure difference between the inside of the cylinder and the inside of the compression working space is small, even if the compressed air in the refrigeration dryer 20 is introduced into the compression working space together with the drain, a power loss due to recompression can be prevented.

Further, by supplying the drain condensed and cooled by the refrigeration dryer 20 to the compression working space, the temperature of the compressed air discharged from the compressor body can be reduced.

The recovery pipe 11 can be provided with a throttle 14 such as an orifice or a valve.
Thereby, the flow rate of the drain flowing from the refrigeration dryer 20 to the compressor body 30 is adjusted.

When the amount of drain generated in the refrigeration dryer 20 exceeds the amount of drain collected in the compressor main body 30, the drain accumulates in the refrigeration dryer 20, and the demand unit 90.
There is a possibility that drain may be mixed into the compressed air supplied to the compressor, while the amount of drain generated in the refrigeration dryer 20 is less than the amount of drain collected in the compressor body 30 and the drain in the refrigeration dryer 20 When the compressed air is recovered, compressed air is supplied from the refrigeration dryer 20 to the compressor main body 30 via the recovery line 11, which leads to loss of power. Is established,
The flow rate of the drain flowing through the recovery pipe 11 is adjusted so that the drain of approximately the same amount as the drain generated in the refrigeration dryer 20 is recovered in the compressor body 30.

The drain condensed and recovered when the compressed air is cooled by the refrigeration dryer 20 includes:
Since water in the outside air sucked by the compressor body 30 is also included, the amount of water stored in the receiver tank 50 increases when the amount of recovered water is larger than the amount of water lost. In this case, when the water level in the receiver tank 50 exceeds a certain value, a drain port 54 formed at a predetermined height position on the side wall of the receiver tank 50 and a drain trap 52 connected to the drain port 54 are formed. Excess water is drained through.

The drain trap 52 is provided with, for example, a known float valve. The drain trap 52 is opened when there is water in the drain trap 52, and the water is discharged out of the water circulation type compressor. When there is no water in the tank 52, it is closed to prevent the compressed air in the receiver tank 50 from being discharged to the outside and the pressure from being reduced.

In the embodiment shown in FIG. 1, a refrigeration dryer 20 is provided as a cooling means for cooling the compressed air and removing the drain generated by condensation during the cooling to dry the compressed air. The cooling means is, for example, as shown in FIG.
For example, an aftercooler 22 may be provided instead of 0, or an aftercooler 22 may be provided together with the refrigeration dryer 20 as shown in FIG.

As shown in FIG. 3, when both the aftercooler 22 and the refrigeration dryer 20 are provided as cooling means, the recovery pipe 11 has one end branched into two branches, one of which passes through the aftercooler 22. The other end is connected to a refrigeration dryer 20 to a drain separator 23 for removing the drain from the compressed air. In addition, the drain separator 23 and the refrigeration dryer 20 communicate with the collection pipe 11 via the throttle unit 14, respectively.

It is to be noted that a drain trap 15 having a known float valve or the like may be provided in the recovery pipe line 11 instead of, or together with, the throttle unit 14. When the drain trap 15 is provided instead of the throttle unit 14 or together with the throttle unit 14, the drain trap 1 is used only when the drain collected from the refrigeration dryer 20 and the drain separator 23 accumulates in the drain trap 15.
5 is opened, so that the pressure and the amount of compressed air supplied to the demand part 90 are kept constant by preventing the decrease of the air pressure and the amount of air due to the constant introduction of the compressed air together with the drain into the compressor body 30. can do.

Next, another embodiment of the present invention is shown in FIG.

In the embodiment shown in FIG. 4, one end of the recovery pipe 11 is connected to the refrigeration dryer 20 (aftercooler 2).
In the case where 2 is provided, it is connected to the refrigeration dryer 20 and the drain separator 23 (hereinafter abbreviated), and the other end is connected to the receiver tank 50.

Further, a pump 16 is connected to the recovery line 11.
Provided from the refrigeration dryer 20 to the receiver tank 50
Transfer drain to This is because the receiver tank 50 to which one end of the recovery pipe 11 is connected and the refrigeration dryer 20 to which the other end is connected have substantially the same pressure.

In the circuit of the embodiment shown in FIG. 4 constructed as described above, the drain generated by cooling by the refrigeration dryer 20 is supplied by the pump 16 to the cooling dryer 2.
From 0, it is collected in the receiver tank 50 via the collection line 11.

The drain collected in the receiver tank 50 in this way is mixed with the water in the receiver tank 50, and is fed together with the water through the pipe 76 by the pressure in the receiver tank 50 to cool the cooler 60. It passes through the water inlet 38 of the compressor body 30 and is introduced into the compression chamber 36.

The water supply port 38 communicates with the inside of the compression operation space after the intake air is confined in the compression chamber 36, so that the collected drain passes through the water supply port 38 after the compression operation space after the intake air is confined. Supplied within.

The water circulation type compressor 10 configured as described above does not supply the drain generated by the cooling means to the compressor body when the water level in the receiver tank 50 exceeds a predetermined value. A configuration that can prevent the drain from being collected more than necessary can be provided. FIG. 5 shows a configuration example of the water circulation type compressor 10 configured as described above.

In FIG. 5, reference numeral 81 denotes a switching valve. In this embodiment, an electromagnetic valve as a three-port valve having one inlet and two outlets is used as the switching valve 81. The switching valve 81 is disposed in the recovery pipe 11 that communicates between the aftercooler 22 and / or the cooling means such as the refrigeration dryer 20 and the compressor main body 30. 1 is connected to the communication port 37 of the compressor main body 30 and the other outlet port is connected to the branch pipe 84, and the cooling means is extended to the communication port 37 of the compressor main body 30 or to the outside by operating the switching valve 81. It is configured so as to be able to communicate with the branched branch line 84 alternatively. In the present embodiment, the cooling means and the communication port 37 of the compressor main body 30 are configured to be able to always communicate with each other. And, this switching valve 81
Is connected to a power supply (not shown) via a water level detecting means 86 attached to the receiver tank 50.

The water level detecting means 86 functions as a switch for closing the circuit between the switching valve 81 and a power supply (not shown) and turning on the switching valve 81 when the water level in the receiver tank 50 rises above a predetermined level. However, in the present embodiment, a float or the like that moves up and down in conjunction with the water level in the receiver tank 50 is provided therein, and when the water level in the receiver tank 50 exceeds a set value, the switching valve 81 is connected to a power supply. Then, the switching valve 81 is operated.

Therefore, when the water level in the receiver tank 50 falls below the set value, the switching valve 81 does not operate, the branch line 84 is closed, and the circuit between the cooling means and the compressor body 30 (the recovery line 11). Is opened, and the drain generated by the cooling means is supplied into the compressor body 30 while the receiver tank 5
When the water level within 0 exceeds a set value, the water level detection means 8
6 closes the circuit between the switching valve 81 and the power source, closes the circuit between the cooling means and the compressor body 30 (recovery line 11) and opens the branch line 84, and the drain collected by the cooling means is discharged to the machine. The water is discharged to the outside, the supply of the drain to the compressor body 30 is stopped, and the amount of water collected in the receiver tank 50 decreases.

[0075]

According to the configuration of the present invention described above, the drain generated during cooling by the refrigeration dryer and the aftercooler is recovered by a relatively simple configuration capable of reducing the size of the entire circuit. Can be supplied into the water circulation system formed in the water circulation type compressor, and therefore, a water circulation method and circuit of the water circulation type compressor which does not require the supply of water to the water circulation system can be provided. .

Further, in the water circulation circuit of the present invention in which the supply of the drain to the compressor body is performed through the compression working space after the intake air is confined, the above-described effect can be obtained without lowering the working efficiency of the water circulation type compressor. I got it.

Further, in the case where a drain trap for collecting drain generated by cooling with a refrigeration dryer and / or an aftercooler is provided in the recovery line, only when drain is collected in the drain trap, The supply of the drain to the water circulation system is performed, the leakage of the compressed air can be prevented, and the pressure drop of the compressed air supplied to the demand part can be prevented.

In addition, in a water circulation circuit having a configuration in which the supply of drain to the compressor body is stopped as the water level in the receiver tank rises, more water than desired is supplied to the water circulation system. In a circulation circuit having a configuration for automatically discharging water in the receiver tank, the amount of water in the water circulation system increases due to excessively collected drain. Even if the increased water can be automatically drained, water replenishment to the water circulation system,
It was possible to provide a water circulation type compressor which did not require any discharge operation.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention (with a refrigeration dryer as a cooling means).

FIG. 2 is a schematic view showing an embodiment of the present invention (with an aftercooler as a cooling means).

FIG. 3 is a schematic view showing one embodiment of the present invention (a cooling device provided with a refrigeration dryer and an aftercooler).

FIG. 4 is a schematic view showing another embodiment of the present invention.

FIG. 5 is a schematic diagram showing another embodiment of the present invention.

FIG. 6 is a schematic diagram showing a conventional example.

[Explanation of symbols]

 Reference Signs List 10 water circulation type compressor 11 recovery line 12 timer mechanism 13 solenoid valve 14 throttle section 15 drain trap 16 pump 20 refrigeration dryer 20 ′ drain tank 22 aftercooler 23 drain separator 30 compressor body 30 ′ air compressor 32 suction port 33 suction chamber 34 Discharge port 36 Compression chamber 38 Water supply port 40 Unloader 50 Receiver tank 52 Drain trap 54 Drain port 56 Drain pipe 60 Cooler 72 Discharge pipe 74, 78, 79, 80, Pipe 76 Water supply pipe 77 Pipe (water drainage) ) 81 Switching valve (solenoid valve) 84 Branch line 86 Water level detecting means 90 Demand section

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H045 AA05 AA23 AA26 BA43 CA15 EA15 EA27 3H071 AA02 AA06 BB01 CC01 CC04 CC33 CC41 DD31 DD73

Claims (9)

[Claims] 1. A compressor according to claim 1, wherein said air is sucked and compressed, discharged together with the water supplied to said compressor main body, separated from water and compressed air in a receiver tank, and supplied with said water to said compressor main body. And a water circulating compressor that circulates water between the receiver tank, cooling the compressed air sent from the receiver tank,
A water circulation method for a water circulation type compressor, comprising condensing water vapor in the compressed air to form a drain, collecting the drain, and supplying the collected drain to a compressor body. 2. A compressor body for compressing intake air and discharging water supplied together with the compressed air, and a compressed air and water discharged from the compressor body, communicating with a discharge port of the compressor body. A water circulation type compressor having a receiver tank that separates and stores compressed air and water by introducing a compressed air and water, and a circuit that circulates the water between the compressor body and the receiver tank. Cool and
A cooling unit for compressed air that condenses water vapor in the compressed air to form a drain; and a circuit that collects drain generated by the cooling unit and supplies the collected drain to a compressor body. Water circulation circuit of a water circulation type compressor. 3. The water circulation according to claim 2, wherein the circuit for supplying the collected drain to the compressor main body supplies the drain to a compression working space after the intake of the compressor main body is closed. Water circulation circuit of compressor. 4. The water circulating compressor according to claim 2, wherein the circuit for supplying drain to the compressor body comprises a recovery pipe having one end communicating with the cooling means and the other end communicating with the compressor body. Water circulation circuit. 5. The collection line according to claim 4, wherein a throttle section is provided.
A water circulation circuit of the water circulation type compressor according to the above. 6. The water circulation circuit of a water circulation type compressor according to claim 4, wherein a drain trap which opens the recovery pipe when a predetermined amount of drain is collected is interposed in the recovery pipe. 7. A circuit for supplying a drain to the compressor main body, the recovery pipe having one end connected to the cooling means and the other end connected to the receiver tank, and the cooling means for cooling the drain in the recovery pipe. 3. A water circulation circuit for a water circulation type compressor according to claim 2, further comprising a pump for transferring the water from the pump to a receiver tank. 8. A branch circuit is formed by branching a circuit for supplying the collected drain to the compressor body via a switching valve, and one end of the branch circuit is extended outside the water circulation type compressor. A water level detecting means for detecting that a water level in the receiver tank has exceeded a predetermined water level, wherein the switching valve supplies the collected drain to a compressor body in accordance with a detection signal of the water level detecting means. The water circulation circuit of the water circulation type compressor according to any one of claims 2 to 7, wherein the water circulation circuit is closed and one end of the branch circuit is opened. 9. The water circulation circuit has a drain pipe having one end extending outside the water circulation type compressor and the other end communicating with a drain port opened at a predetermined height on a side surface of the receiver tank. The water circulation system according to any one of claims 2 to 8, wherein a drain trap that opens the drainage pipe when a predetermined amount of water is collected in the receiver tank is provided in the drainage pipe. Water circulation circuit of compressor.