Patent Description:
There is known a gas compressor that generates compressed gas and is used as a power source in a production line or an air source for a machine tool, a press machine, an air blower, or the like. The gas compressor includes a compression portion that compresses the gas in a compression chamber formed by a casing, and the compressed gas is discharged from a discharge port to a gas tank via a discharge pipe.

In addition, there is a package-type fluid machine in which a compression portion, a motor that drives the compression portion, a control circuit, an operation panel, and the like are integrated into a package to save space. In the package-type fluid machine, the compression portion and an inverter are required to be cooled.

There is Patent Document <NUM> as a background art relating to the cooling of a package-type fluid machine. In Patent Document <NUM>, a compression portion is provided with a cooling fan. Further, an inverter is provided in an intake path through which cooling air generated by the cooling fan flows. It is described that a package-type compressor in which restriction on the disposition of components is reduced to improve productivity while cooling of the inverter is secured can be obtained with such a configuration. <CIT> discloses a package type compressor, a compressor main body, a motor, an oil separator and an oil cooler which are housed inside the package. <CIT> discloses a package type compressor which includes a compressor body compressing the air, a motor driving the compressor body, an inverter controlling rotation speed of the motor and a cooling fan provided in the compressor body, in which the inverter is provided in an intake path of cooling air generated by the cooling fan provided in the compressor body. Patent document <NUM> discloses a package type rotary pump unit which comprises: a rotary pump; an electric motor; a package forming a housing space for housing them; and a cooling fan. Patent document <NUM> discloses a scroll fluid machine which have a compressor body including a fixed scroll and an orbiting scroll opposed to the fixed scroll, the orbiting scroll orbiting; a drive shaft connected to the orbiting scroll; a cooling fan.

In the package-type compressor disclosed in Patent Document <NUM>, the compression portion to which the cooling fan is attached is disposed below a motor, and the inverter is disposed in an upper portion with respect to the compression portion. In addition, the inverter and the cooling fan are separated from each other by the length in a lateral direction of the motor, and the interval between an intake port and the cooling fan is long. For this reason, there is a possibility that the flow rate of the cooling air suctioned by the cooling fan is reduced to cause a decrease in cooling efficiency.

An object of the present invention is to provide a package-type fluid machine in which the cooling efficiency of an inverter is improved.

The above cited problem is solved in accordance with the appended claims.

According to the present invention, a package-type fluid machine in which the cooling efficiency of the inverter is improved can be realized.

<FIG> is a front view of a package-type fluid machine <NUM> in a first embodiment. A front panel <NUM> forming a part of a casing of the package-type fluid machine <NUM> can be attached to and removed from a portion of the casing other than the front panel by a holding mechanism such as screws.

In addition, an operation panel <NUM> through which the package-type fluid machine <NUM> is operated is disposed in a front surface of the package-type fluid machine <NUM>.

The front panel <NUM> is a panel that covers the front surface of the package-type fluid machine <NUM> except a position where the operation panel is located, and when the front panel <NUM> is removed, maintenance of internal components or the like can be performed.

<FIG> is a side view on a left side of the package-type fluid machine <NUM> when seen from the front.

A first stage inverter <NUM>, a second stage inverter <NUM>, and a third stage inverter <NUM> illustrated by dotted lines are disposed on a back surface side of a left side surface of a casing <NUM> in order from above.

In addition, the casing <NUM> is provided with a first stage side intake port <NUM> for an inverter which takes in outside air to cool the first stage inverter <NUM>, a second stage side intake port <NUM> for an inverter which cools the second stage inverter <NUM>, and a third stage side intake port <NUM> for an inverter which cools the third stage inverter <NUM> in order from above.

<FIG> is a side view on a right side of the package-type fluid machine <NUM> when seen from the front.

A first main intake port <NUM>, a second main intake port <NUM>, and a third main intake port <NUM> that take in outside air which is a fluid to be compressed by a compression portion are disposed from above on a front surface side of a right side surface of the casing <NUM>.

The side intake ports <NUM>, <NUM>, and <NUM> for inverters and the main intake ports <NUM>, <NUM>, and <NUM> are disposed opposite to each other when seen from the front. Therefore, the amount of intake air for cooling the inverters and the amount of intake fluid to be compressed can be increased without interference between both the intakes.

<FIG> is a top view of the package-type fluid machine <NUM>.

An exhaust port <NUM> through which gas that has cooled the inverter, the compression portion, and a primary aftercooler is exhausted to the outside is disposed in a leftward direction of the front surface side in an upper surface of the casing <NUM>.

<FIG> is a back view of the package-type fluid machine <NUM>.

As illustrated by dotted lines, the first stage inverter <NUM>, the second stage inverter <NUM>, and the third stage inverter <NUM> are disposed in a back surface of the casing <NUM> in order from above.

In addition, the casing <NUM> is provided with a first stage back intake port <NUM> for an inverter which takes in outside air to cool the first stage inverter <NUM>, a second stage back intake port <NUM> for an inverter which cools the second stage inverter <NUM>, and a third stage back intake port <NUM> for an inverter which cools the third stage inverter <NUM> in order from above.

<FIG> is a view illustrating an internal configuration of the package-type fluid machine <NUM> when seen from the front.

A first stage compressor unit <NUM>, a second stage compressor unit <NUM>, and a third stage compressor unit <NUM> are disposed in a central portion of the package-type fluid machine <NUM> in order from above.

The operation panel <NUM> which receives an operation instruction or displays a warning or the like is disposed on a right side of the first stage compressor unit <NUM>.

<FIG> is a view illustrating an internal configuration of the side surface on the left side of the package-type fluid machine <NUM> when seen from the front.

A first stage primary aftercooler <NUM> which cools the fluid compressed by a compression portion of the first stage compressor unit <NUM>, a second stage primary aftercooler <NUM> which cools the fluid compressed by a compression portion of the second stage compressor unit <NUM>, and a third stage primary aftercooler <NUM> which cools the fluid compressed by a compression portion of the third stage compressor unit <NUM> are disposed on a front surface side of the left side surface of the package-type fluid machine <NUM> in order from above.

The first stage inverter <NUM> which controls a motor of the first stage compressor unit <NUM>, the second stage inverter <NUM> which controls a motor of the second stage compressor unit <NUM>, and the third stage inverter <NUM> which controls a motor of the third stage compressor unit <NUM> are disposed in order from above on the back surface side of the side surface of the package-type fluid machine <NUM> when seen from the left.

<FIG> is a view illustrating an internal configuration on the right side of the package-type fluid machine <NUM> when seen from the front. A secondary aftercooler or a dryer that cools the compressed fluid which has passed through the primary aftercoolers is disposed on the right side of the package-type fluid machine <NUM> when seen from the front.

The primary aftercoolers <NUM>, <NUM>, and <NUM> are disposed on the left side when seen from the front, the secondary aftercooler and the dryer are separately disposed on the right side when seen from the front, and the primary aftercoolers <NUM>, <NUM>, and <NUM> are disposed on the front surface side. In such a manner, maintenance work of the primary aftercoolers <NUM>, <NUM>, and <NUM> can be easily performed from the front surface side.

<FIG> is a view illustrating an internal configuration of the package-type fluid machine <NUM> when seen from the back. A first stage cooling duct <NUM> of the first stage compressor unit <NUM>, a second stage cooling duct <NUM> of the second stage compressor unit <NUM>, and a third stage cooling duct <NUM> of the third stage compressor unit <NUM> are disposed in a central portion of the package-type fluid machine <NUM> in order from above.

The first stage inverter <NUM>, the second stage inverter <NUM>, and the third stage inverter <NUM> are disposed in order from above on the right side when seen from the back.

<FIG> is a view illustrating an internal configuration of the package-type fluid machine <NUM> when seen from the top.

The first stage compressor unit <NUM> is disposed in a central portion, and the compression portion, the motor, and a cooling fan are disposed in a backward direction in order from the front surface side.

The cooling duct <NUM> which allows the cooling gas to flow from the cooling fan toward the compression portion and extends toward the front surface side is disposed on the right side of the first stage compressor unit <NUM> when seen from the front. A cooling duct having the same configuration is disposed below the first stage compressor unit <NUM>.

The first stage primary aftercooler <NUM> is disposed on the left side of the package-type fluid machine <NUM> when seen from the front.

In addition, the first stage inverter <NUM> is disposed on a back surface side of the first stage primary aftercooler <NUM>.

<FIG> is a perspective view illustrating an internal configuration of the package-type fluid machine <NUM> in the first embodiment.

Drawer mechanisms <NUM> including pedestals on which the compressor units <NUM>, <NUM>, and <NUM> are placed, respectively, are provided. When maintenance is performed, the drawer mechanisms <NUM> can be used to draw the compressor units <NUM>, <NUM>, and <NUM> out to the front surface, respectively. Here, the drawer mechanism <NUM> includes the pedestal, a rail, a caster, and the like.

An inverter intake port which takes in outside air into an inverter chamber <NUM> where the inverter is disposed is provided in a side surface and a back surface of each of the inverter chambers. The cooling gas which is taken in from the inverter intake port by the drive of the cooling fan is suctioned toward the cooling fan through an opening <NUM> provided in a partition wall <NUM> that partitions off the inverter chamber <NUM> from a machine chamber <NUM> which is adjacent to the inverter chamber <NUM> and in which compressor units <NUM> are disposed.

Then, the cooling gas cools the compression portion and cools the primary aftercooler <NUM> through the cooling duct <NUM> illustrated in <FIG>, and then is released to the outside from the exhaust port <NUM> through an exhaust duct <NUM>.

As illustrated in <FIG>, on a back surface of each stage of the inverters, inverter intake ports <NUM>, <NUM>, and <NUM> are provided below the inverters, respectively, and the opening <NUM> is provided on an upper side of each of the inverters. Since the inverter intake port <NUM> and the opening <NUM> are located at different upper and lower positions, the cooling gas taken in from the intake port flows by the inverter from below to above, so that the entirety of the inverter can be cooled. The positional relationship between the inverter intake port and the opening may be such that the inverter intake port is located on an upper side and the opening is located on a lower side.

At least three openings <NUM> are provided in the partition wall <NUM> to correspond to the stages of the compressor units <NUM>, <NUM>, and <NUM>, respectively.

The inverter chamber <NUM> including the inverter intake port and the machine chamber <NUM> in which the compressor unit <NUM> is disposed are disposed on a back surface side of the package-type fluid machine <NUM> in a state where both the chambers are adjacent to each other. Further, the opening <NUM> is provided on the back surface side of the package-type fluid machine <NUM>, and the cooling fan is disposed on a side where the opening <NUM> is located. For this reason, unlike Patent Document <NUM>, the intake port and the cooling fan are not separated from each other by the length of the motor or more. As a result, according to the first embodiment, the cooling gas having a flow rate sufficient to cool the inverter or the compression portion can be suctioned from the inverter intake port by the drive of the cooling fan, so that the cooling efficiency of the inverter or the like can be improved.

The exhaust duct <NUM> is disposed on a front surface side of a left side of the machine chamber <NUM>, in which the compressor units <NUM>, <NUM>, and <NUM> are disposed, when seen from the front.

The inverter chambers <NUM> are disposed in three stages on a back surface side of the exhaust duct <NUM> to correspond to the compressor units <NUM>, <NUM>, and <NUM>, and the inverter which controls the motor is disposed in each of the inverter chambers <NUM>.

As illustrated in <FIG>, the compressor units <NUM>, <NUM>, and <NUM> which are longer than the longitudinal dimension of the exhaust duct <NUM> are disposed on a right side of the exhaust duct <NUM> when seen from the front. Therefore, in order to effectively utilize a space on the back surface side of the exhaust duct <NUM>, the inverter chambers <NUM> are disposed on the back surface side of the exhaust duct <NUM>, so that the size of the package-type fluid machine <NUM> can be reduced.

<FIG> is a view for describing the compressor unit <NUM>. The compressor unit <NUM> includes a compression portion <NUM>, a motor <NUM>, and a cooling fan <NUM>. In the present embodiment, the compression portion <NUM> is a scroll compressor, and the motor <NUM> is an axial gap type motor. A sirocco fan is used as the cooling fan <NUM>.

In each of the compressor units <NUM>, <NUM>, and <NUM>, the compression portion <NUM>, the motor <NUM>, and the cooling fan <NUM> are disposed from the front surface side toward the backward direction. The compression portion <NUM> having a high maintenance frequency is disposed on the front surface side. For this reason, when the drawer mechanism <NUM> is used to draw the compression portion <NUM> out, maintenance work can be easily performed.

The motor <NUM> and the compression portion <NUM> of the compressor unit <NUM> are combined to form a compressor unit integrated with a motor. Since the motor <NUM> is an axial gap type motor having a structure where a rotor disposed in a disk shape and a stator rotate while facing each other, the motor <NUM> can be made thin. Further, since amorphous which is a material having high magnetic permeability and small core loss is used as the material of a stator core, the efficiency of the motor can be improved and the size of the motor can be further reduced.

The cooling fan <NUM> is installed on an end portion side of a rotary shaft <NUM> rotated by the motor <NUM>. The cooling fan <NUM> has a structure where rotary blades mounted on the rotary shaft <NUM> are accommodated inside a fan cover made of resin.

The cooling fan <NUM> is a so-called suction type cooling fan that suctions outside air, which flows into the cooling fan <NUM> from a side surface of the cooling fan <NUM> by the rotation of the rotary blades driven by the rotary shaft <NUM>, to generate cooling air.

The cooling air generated inside the fan cover by the rotation of the rotary blades is supplied to a fixed scroll or an orbiting scroll of the scroll compressor, which is the compression portion <NUM>, through the cooling duct <NUM> (refer to <FIG>) that is provided in a right side surface of the compressor unit <NUM> when seen from the front.

In the embodiment, a case where the number of the stages of the inverters, the compressor units, or the primary aftercoolers is <NUM> has been described; however, the number of the stages is not limited to <NUM>, and a plurality of stages may be provided to make the set area of the package-type fluid machine <NUM> compact.

Claim 1:
A package-type fluid machine comprising:
a plurality of compressor units (<NUM>,<NUM>,<NUM>,<NUM>) and a plurality of inverters (<NUM>,<NUM>,<NUM>), wherein the compressor units (<NUM>,<NUM>,<NUM>,<NUM>) and the inverters (<NUM>,<NUM>,<NUM>) are disposed in a plurality of stages in a longitudinal direction;
wherein each compressor unit (<NUM>) including a compression portion (<NUM>) that compresses a fluid, a motor (<NUM>) that drives the compression portion (<NUM>), and a cooling fan (<NUM>) that is driven by the motor (<NUM>);
each stage of the package-type fluid machine further comprises:
a machine chamber (<NUM>) in which the compressor unit (<NUM>) is disposed; and
an inverter chamber (<NUM>) which is adjacent to the machine chamber (<NUM>) and in which the inverter is disposed; and
a partition wall (<NUM>) that partitions off the machine chamber (<NUM>) from the inverter chamber (<NUM>); and
a main intake port (<NUM>,<NUM>,<NUM>) that takes in the fluid to be compressed by the compression portion (<NUM>);
characterised in that each stage further comprises:
an opening (<NUM>) in the partition wall; and
an inverter intake port (<NUM>,<NUM>,<NUM>) that is disposed in the inverter chamber (<NUM>) to take in an outside air,
wherein the cooling fan (<NUM>) is disposed on a side of the machine chamber (<NUM>), the opening (<NUM>) being located on the side, and
the cooling fan (<NUM>) is driven to cause the outside air to flow from the inverter intake port (<NUM>,<NUM>,<NUM>) to the opening (<NUM>) to cool the inverter,
wherein the inverter intake port (<NUM>,<NUM>,<NUM>) and the main intake port (<NUM>,<NUM>,<NUM>) are disposed on opposite sides when seen from a front.