JP4387838B2 - Package type gas compressor - Google Patents

Description

The present invention relates to a package type gas compressor suitable for use in compressing a fluid such as air.

  Generally, as a gas compressor, it is used for compressing air, for example, and is composed of a compression unit that compresses sucked air and discharges compressed air, an air tank that stores compressed air discharged from the compression unit, and the like Is known (for example, see Patent Document 1).

JP 2004-36400 A

  In such a conventional technique, an unload mechanism for switching the operation state of the compression unit between the load operation and the no-load operation is provided in the compression unit, and the compressed air in the air tank is guided to the unload mechanism. ing. The air tank is provided with a pressure sensor for detecting the internal pressure. Thus, in the conventional technique, the switching operation of the unload mechanism is controlled according to the pressure in the air tank detected by the pressure sensor.

  By the way, in the air compressor by the prior art mentioned above, the compression part and the air tank were arrange | positioned near each other like the inside of a package etc., for example. And in order to perform the switching operation of the unload mechanism provided in the compression part according to the pressure value which detected the internal pressure of the tank with the pressure sensor, it is for transmitting a detection signal from the pressure sensor toward the compression part side. A signal line was provided.

  However, there is a case where compressed air is supplied to an air tank arranged away from the compression unit due to a user's request, and in this case, a signal line for transmitting a detection signal of the pressure sensor to the compression unit side is provided. In addition to being long, the piping for guiding the compressed air to the unloading mechanism is also long, resulting in a problem that the manufacturing cost increases.

  Further, when the compression unit and the air tank are accommodated in the package, the temperature of the compressed air is increased by the compression operation, so that the air tank that stores the compressed air also generates heat, and the temperature in the package is likely to rise. It was a structure. For this reason, the compression part accommodated in the package has a tendency that the temperature of the bearing, for example, also rises, and the durability and the reliability tend to decrease.

  In addition, because the standards for pressure tanks such as air tanks differ from country to country, for example, it is not possible to export a Japanese-specific compressor as it is to a foreign country, and it is necessary to replace the pressure container in the package for each country. There was also.

The present invention has been made in view of the problems in the conventional technology, an object of the present invention, it is possible to omit the signal line connecting between the reservoir tank and the compressed portion, it is possible to reduce the manufacturing cost It is to provide a package type gas compressor.

In order to solve the above-described problems, the invention of claim 1 is provided in a package formed in a box shape, a compression unit provided in the package for sucking and compressing gas, and discharging compressed gas , and provided in the package. provided a motor for driving the compression section, and a switching mechanism for switching the operating state of the compression unit in response to the pressure of the compressed gas discharged from the compression unit provided in the package, it said in said package In a package type gas compressor in which a storage tank for storing compressed gas is not disposed, the compressed gas is discharged to the compression unit toward the storage tank located outside the package and connected to the compression unit. the discharge pipe connected to said discharge output pipe connects the pressure detection passage for guiding part of the compressed gas toward the pressure detector provided in the package, the pressure test A throttle mechanism that reduces the pulsation of compressed gas pressure is provided in the middle of the passage, and the switching mechanism is configured to switch the operating state of the compression unit according to the pressure value detected by the pressure detector. It is characterized by.

According to a second aspect of the present invention, the switching mechanism is an unloading mechanism that switches between a load operation and a no-load operation of the compression unit according to the pressure of the compressed gas discharged from the compression unit, and the pressure detection passage. The unloading passage is branched and connected to the upstream side of the throttle mechanism, and the unloading passage is connected to the unloading mechanism.

According to a third aspect of the present invention, an electromagnetic valve that switches between opening and closing according to the pressure value detected by the pressure detector is provided in the middle of the unloading passage.

According to the present invention, since the compression section connecting the discharge pipe for discharging the compressed gas toward the reservoir tank provided on the outside of the package, it is possible to omit the storage tanks from the package, the reservoir to prevent a temperature rise in the package due to heat generation of the tank, for example, the reliability of the bearing or the like of the compression unit, it is possible to enhance the durability. Further, since it is possible to omit the storage tanks from the package, it is sufficient to connect the discharge pipe relative to the storage tank which is applied to the country standards, specifications of the storage tank is different, for example the country in which the compressor is used Even in the country, the compressor can be used as it is.

In addition, a pressure detector provided in the package is connected to the discharge pipe via a pressure detection passage, and a throttle mechanism is provided in the middle of the pressure detection passage, so that the pressure detection is performed via the pressure detection passage. A part of the compressed gas can be guided to the vessel, and the pulsation of the pressure of the compressed gas can be suppressed by using the throttle mechanism. Therefore, even without mounting the reservoir tank for storing the compressed gas pressure detector can detect the pressure in the storage tank using a pressure detector in connected to the discharge pipe package. As a result, the switching mechanism can switch the operation state of the compression section between, for example, no-load operation and load operation according to the pressure value detected by the pressure detector in the package . Furthermore, since connecting a pressure detector in the package to the discharge pipe by using the pressure detection passage, even when arranging the reservoir tank at a position away from the compression unit, it is not necessary to attach the pressure detector to the storage tank . For this reason, a signal line or the like for transmitting a pressure detection signal to the external storage tank can be omitted, and the manufacturing cost can be reduced.

According to the invention of claim 2 , the switching mechanism is constituted by the unload mechanism that switches between the load operation and the no-load operation of the compression unit according to the pressure of the compressed gas discharged from the compression unit, and the pressure detection passage Since the unload passage is branched and connected, part of the compressed gas can be guided to the unload mechanism through the unload passage. For this reason, the unload mechanism can be driven using the pressure of the compressed gas (unload pressure), and can switch between the load operation (load operation) and the no-load operation (unload operation) of the compression unit. .

  In addition, since the unload passage is branched and connected to the upstream side of the throttle mechanism, high-pressure compressed gas before being throttled by the throttle mechanism can be guided to the unload mechanism, and the unload mechanism is driven. A sufficiently high unloading pressure required for the unloading mechanism can be supplied to the unloading mechanism.

According to the invention of claim 3 , since the electromagnetic valve for switching the valve opening and closing according to the pressure value detected by the pressure detector is provided in the middle of the unloading passage, for example, a plurality of through the unloading passage. Even when the unloading mechanism is driven, all the unloading mechanisms can be switched between driving and stopping by opening and closing a single solenoid valve. In addition, since the solenoid valve switches between opening and closing according to the detection result of the pressure detector, even if the storage tank is provided outside the package, the pressure detector and solenoid valve in the package are used. The unload mechanism can be controlled.

  Hereinafter, a package type air compressor will be described as an example of a gas compressor according to an embodiment of the present invention, and will be described in detail with reference to the accompanying drawings.

  In the figure, reference numeral 1 denotes a package constituting the outer shell of the air compressor, and the package 1 is formed in a substantially rectangular parallelepiped box shape. The package 1 houses a compressor main body 3, a motor 8 and the like, which will be described later, and constitutes a soundproof box that prevents operating noise of the compressor main body 3 and the like from leaking to the outside.

  Reference numeral 2 denotes a fixing base provided in the package 1, and the fixing base 2 is composed of a lower frame 2A and an upper frame 2C disposed above the lower frame 2A via a plurality of vertical frames 2B. Has been.

  Reference numeral 3 denotes a compressor main body serving as a compression unit positioned in the package 1 and installed on the upper frame 2C of the fixed base 2. The compressor main body 3 is, for example, a three-cylinder reciprocating motion having three cylinders 4. It is composed of a compressor. Further, as shown in FIG. 3, a piston 5 is provided in each cylinder 4 so as to be able to reciprocate, and a cylinder head 6 having an intake valve 6A and a discharge valve 6B is attached to the tip side of the cylinder 4. ing. The compressor body 3 is driven by a pulley 8 connected to a crankshaft (not shown) by a motor 8 described later, whereby the piston 5 reciprocates in each cylinder 4 and is sucked from the intake valve 6A. The air is compressed and the compressed air is discharged through the discharge valve 6B.

  As shown in FIG. 2, 8 is a motor as a drive unit mounted on the lower frame 2A of the fixed base 2. A pulley 9 is provided on the output shaft of the motor 8, and the pulley 9 and the compressor body 3 are connected to each other. A belt 10 is stretched between the pulley 7. The motor 8 rotates the output shaft by being supplied with power from an inverter device or the like (not shown), and drives the compressor body 3 via the belt 10, the pulley 9, and the like.

  As shown in FIG. 3, reference numeral 11 denotes an unload mechanism as a switching mechanism provided in the cylinder head 6 of each cylinder 4. The unload mechanism 11 is a bottomed cylindrical unload cylinder provided in the cylinder head 6. 12 and an unload piston 13 slidably fitted into the unload cylinder 12 and capable of forcibly opening the intake valve 6A. Further, the unload piston 13 is always separated from the intake valve 6A by the spring 14. On the other hand, when compressed air is supplied to the back surface of the unloading piston 13 through the unloading conduit 23 described later, the unloading piston 13 contacts the intake valve 6A and forcibly opens the intake valve 6A. Thereby, the unload mechanism 11 becomes a structure which switches the driving | running state of the compressor main body 3 between load operation and no-load operation.

  15 is a discharge pipe connected to the discharge side of each cylinder 4. The discharge pipe 15 is connected to each cylinder 4 with one end branching into three as shown in FIGS. The sides merge into one and extend toward the outside of the package 1. Further, a discharge connector 16 that can be connected to an external air tank 27 and the like, which will be described later, is attached to the other end side of the discharge pipe 15. Thereby, the discharge pipe 15 collects the compressed air discharged from the three cylinders 4 and supplies it to the external air tank 27.

  Reference numeral 17 denotes a connector pipe seat for fixing the discharge connector 16 to the fixed base 2, and the connector pipe seat 17 is attached to the vertical frame 2 </ b> B of the fixed base 2 using bolts or the like as shown in FIGS. 4 to 6. In addition, the branch pipe 16A branched from the discharge connector 16 is supported. Accordingly, the connector pipe seat 17 fixes the discharge connector 16 through the branch pipe line 16A, and supports a later-described relief valve 18, an orifice 19 and the like connected to the branch pipe line 16A.

  Reference numeral 18 denotes a relief valve provided in the middle of the branch pipe line 16A. The relief valve 18 prevents the pressure in the branch pipe line 16A from becoming higher than necessary. As a result, the relief valve 18 prevents excessive pressure from acting on the unload mechanism 11 and the pressure sensor 22 connected to the branch pipeline 16A via the unload pipeline 23 described later. Yes.

  Reference numeral 19 denotes an orifice as a throttle mechanism provided at the tip of the branch pipe 16A. The orifice 19 is formed in a substantially cylindrical shape as shown in FIGS. 7 and 8, and has a large diameter extending in the axial direction inside thereof. A pressure introducing passage 19 </ b> A composed of a through hole is provided. One end side, which is the upstream side, of the pressure introduction passage 19A communicates with the branch pipe line 16A (discharge pipe 15), and the other end side, which is the downstream side, communicates with a pressure detection pipe line 21 which will be described later. .

  In addition, a narrowed portion 19B having a small diameter hole is formed in the middle of the pressure introduction passage 19A. As a result, the throttle portion 19B suppresses sudden inflow and outflow of compressed air, and prevents the pulsation of the pressure of the compressed air from being transmitted to the downstream side of the pressure introduction passage 19A.

  On the other hand, in the middle of the pressure introduction passage 19A, a branch passage 19C located upstream from the throttle portion 19B and extending outward in the radial direction communicates, and the branch passage 19C communicates with an unloading conduit 23 described later. It is connected.

  A filter 20 is attached to one end of the pressure introduction passage 19A using a retaining ring 20A. Further, the orifice 19 is subjected to a surface treatment such as SUS or plating. Thereby, the inner peripheral surfaces of the pressure introduction passage 19A, the throttle portion 19B, and the branch passage 19C have rust prevention specifications, and for example, the throttle portion 19B is prevented from being clogged by rust.

  Reference numeral 21 denotes a pressure detection conduit that forms a pressure detection passage together with the pressure introduction passage 19A. The pressure detection conduit 21 is connected to the orifice 19 on the downstream side of the throttle portion 19B. 2 and 4, one end side of the pressure detection pipe 21 is connected to the downstream side of the pressure introduction passage 19 </ b> A of the orifice 19 using a connector 21 </ b> A, and the other end side is provided in the package 1. Connected to a pressure sensor 22 as a pressure detector. As a result, the pressure detection pipe 21 guides part of the compressed air in the discharge pipe 15 to the pressure sensor 22 via the orifice 19 and the like.

  Reference numeral 23 denotes an unloading conduit as an unloading passage that is branched and connected to the upstream side of the throttle portion 19B in the orifice 19, and the unloading conduit 23 has an orifice 19 on one end side using a connector 23A. The other end side is connected to the three unload mechanisms 11. Thereby, the unloading pipeline 23 guides a part of the compressed air in the discharge pipe 15 to the back side of the unloading piston 13.

  An electromagnetic valve 24 is provided in the middle of the unloading conduit 23. The electromagnetic valve 24 communicates and blocks the unloading conduit 23 based on a control signal from a controller 25 described later. Thereby, the solenoid valve 24 switches the drive and stop of the three unload mechanisms 11 together.

  Reference numeral 25 denotes a controller as a control unit provided in the package 1, and the controller 25 is driven and stopped by using an operation panel 26 provided on the front surface of the package 1, and the input side thereof is a pressure sensor. 22 and the output side is connected to the solenoid valve 24.

  For example, when the pressure of the compressed air detected by the pressure sensor 22 rises above a predetermined upper limit value, the controller 25 opens the electromagnetic valve 24 to operate the unload mechanism 11. Thereby, since the intake valve 6A is forcibly opened, the compressor main body 3 performs no-load operation without performing the air compression operation.

  On the other hand, the controller 25 closes the electromagnetic valve 24 and stops the unload mechanism 11 when the pressure of the compressed air falls below a predetermined lower limit value. As a result, the compressor body 3 performs load operation for performing the compression operation because the intake valve 6A can be opened and closed.

Reference numeral 27 denotes an air tank as a storage tank that is located outside the package 1 and is connected to the compressor main body 3. The air tank 27 is connected to the discharge connector 16 on the package 1 side using a connection pipe 28. . The air tank 27 is formed as a cylindrical hermetic container whose both ends are closed, stores the compressed air discharged from the compressor body 3, and takes out the stored compressed air through various discharge pressures 29. It is supplied toward a device (not shown).

  The package type air compressor according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

  First, when the operation panel 26 is operated to start the motor 8 and the controller 25, the rotational force of the motor 8 is transmitted to the compressor body 3 via the belt 10 or the like, and the compressor body 3 is placed in each cylinder 4. The air is sucked in and compressed, and discharged toward the external air tank 27 through the discharge pipe 15. Thereby, the compressed air discharged from the compressor body 3 is temporarily stored in the air tank 27, and the compressed air stored in the air tank 27 is supplied with various pneumatic pressures via the extraction pipe 29. Supplied towards the equipment.

  When compressed air flows through the discharge pipe 15, a part of the compressed air is supplied to the pressure detection pipe 21 and the unload pipe 23. At this time, the pressure detection pipe 21 is connected to the downstream side of the throttle part 19B of the orifice 19 and the pressure pulsation is blocked by the throttle part 19B. Therefore, the pressure connected to the pressure detection pipe 21 A steady pressure excluding pulsation in the discharge pipe 15 acts on the sensor 22. Since the steady pressure in the discharge pipe 15 becomes substantially equal to the pressure in the air tank 27, the pressure in the air tank 27 can be detected using the pressure sensor 22 connected to the discharge pipe 15.

  On the other hand, high-pressure compressed air before being throttled by the throttle portion 19B is guided to the unloading conduit 23 connected to the upstream side of the throttle portion 19B in the orifice 19. For this reason, the unloading conduit 23 can supply driving pressure toward the unloading mechanism 11. An electromagnetic valve 24 that is opened and closed by the controller 25 is provided in the middle of the unloading pipeline 23, and the input side of the controller 25 is connected to the pressure sensor 22. For this reason, the controller 25 opens and closes the electromagnetic valve 24 according to the pressure detected by the pressure sensor 22 to control the driving and stopping of the unload mechanism 11.

  However, in the present embodiment, since the pressure sensor 22 is connected to the discharge pipe 15 via the pressure detection pipe 21, it is not necessary to attach the pressure sensor 22 to the air tank 27. Therefore, a signal line for transmitting a pressure detection signal can be omitted from the air tank 27 provided outside the package 1, and the unload mechanism 11 and the air tank 27 are connected. Piping can also be omitted, and manufacturing costs can be reduced.

  Further, since the discharge pipe 15 that discharges compressed air toward the air tank 27 provided outside the package 1 is connected to the compressor body 3, the air tank 27 can be omitted from the package 1. At this time, compressed air whose temperature has been raised by the compression operation of the compressor body 3 is supplied to the air tank 27, so that the air tank 27 tends to generate heat, whereas the air tank 27 is contained in the package 1. Therefore, temperature rise in the package 1 due to heat generated by the air tank 27 can be prevented. For this reason, for example, the reliability and durability of the bearings of the compressor body 3 can be improved, and it is not necessary to provide a cooling mechanism for the air tank 27 in the package 1, and the manufacturing cost and consumption associated with the cooling mechanism Electric power can be reduced.

  Further, since the air tank 27 can be omitted from the package 1, even when the package-type air compressor according to the present embodiment is used in a plurality of countries having different air tank standards, the country in which the air tank 27 is used. What is necessary is just to connect the discharge piping 15 with respect to the air tank 27 applied to these standards, and the package type air compressor according to this embodiment can be used as it is in a plurality of countries. As a result, when an air tank is provided in the package 1, it is necessary to replace the air tank for each country where it is used. Can be improved.

  Further, since the unloading pipe line 23 is connected to the discharge pipe 15, a part of the compressed air flowing through the discharge pipe 15 can be guided to the unload mechanism 11 through the unload pipe line 23. For this reason, the unload mechanism 11 can be driven using the compressed air supplied from the discharge pipe 15, and can switch between the load operation and the no-load operation of the compressor body 3.

  Furthermore, since the pressure sensor 22 is connected to the discharge pipe 15 via the pressure detection pipe 21 and the orifice 19 is provided in the middle of the pressure detection pipe 21, the pressure sensor 22 is passed through the pressure detection pipe 21. A part of the compressed gas can be guided to the pressure sensor, and the pulsation of the pressure of the compressed gas can be prevented from being transmitted to the pressure sensor 22 using the orifice 19. Therefore, the pressure in the air tank 27 connected to the discharge pipe 15 can be detected without attaching the pressure sensor 22 to the air tank 27 as in the prior art, and the pressure value detected by the pressure sensor 22 can be detected. It can be used to control the driving and stopping of the unload mechanism 11.

  In addition, since the unload conduit 23 is branched and connected to the upstream side of the throttle portion 19B in the orifice 19, high-pressure compressed air before being throttled by the throttle portion 19B is supplied to the unload mechanism 11. can do. For this reason, even when a plurality of (for example, three) unloading mechanisms 11 are connected to the unloading conduit 23, sufficiently high-pressure compressed air necessary for driving these unloading mechanisms 11 is supplied. The unload mechanism 11 can be supplied, and all these unload mechanisms 11 can be driven simultaneously.

  On the other hand, since the pressure sensor 22 is connected to the downstream side of the throttle portion 19B in the orifice 19, the compressed air after being throttled by the throttle portion 19B can be supplied to the pressure sensor 22. Thereby, since the rapid outflow and inflow of the compressed air are suppressed by the throttle portion 19B of the orifice 19, for example, the pulsation of the compressed air based on the compressor main body 3 can be shut off, and the discharge pipe 15 is connected to the pressure sensor 22. Only a steady pressure can be applied. At this time, since the discharge pipe 15 is connected to the external air tank 27, the pressure sensor 22 provided on the downstream side of the orifice 19 can be used in the air tank 27 even if the pressure sensor 22 is not provided in the air tank 27. Can be detected.

  Further, an electromagnetic valve 24 that switches between opening and closing in accordance with the pressure value detected by the pressure sensor 22 is provided in the middle of the unloading pipeline 23, so that three pieces are provided through one unloading pipeline 23. Even when the unload mechanism 11 is driven, all the unload mechanisms 11 can be switched between driving and stopping by opening and closing the single electromagnetic valve 24. Further, since the solenoid valve 24 switches between opening and closing according to the detection result of the pressure sensor 22, even when the air tank 27 is provided outside the package 1, the pressure sensor 22 in the package 1, the electromagnetic The unload mechanism 11 can be controlled using the valve 24.

  Further, since the pressure detection pipe 21 is connected to the orifice 19 and the unload pipe 23 is branched and connected, the orifice 19 is branched from the two pipes 21 and 23. The relief valve 18 that can be used as a member and prevents an increase in pressure supplied to the pipes 21 and 23 can be shared. For this reason, for example, compared with the case where the pressure detection pipe 21 and the unload pipe 23 are separately connected in the middle of the discharge pipe 15, the number of branch pipe members and relief valves can be reduced. Manufacturing cost can be reduced.

  Further, the discharge pipe 15 is fixed to the fixing base 2 in the package 1 using a discharge connector 16 and a connector tube seat 17, and a branch pipe line 16A connected to an orifice 19 or the like using the discharge connector 16 or the like. Since the branching structure is used, the connector pipe seat 17 can be used as a fixing member for the discharge pipe 15 and can be used as a branch pipe. For this reason, compared with the case where fixing and branching of the discharge pipe 15 are performed at different locations, the number of parts can be reduced.

  In the above-described embodiment, the compression unit is configured using a three-cylinder reciprocating compressor, but the compression unit may be configured using, for example, a one-cylinder or two-cylinder reciprocating compressor. You may comprise a compression part using the above reciprocating compressor.

  In the above embodiment, the discharge pipe 15 is branched and connected in parallel to a three-cylinder reciprocating compressor, and the three-cylinder reciprocating compressor is compressed by one stage. However, the present invention is not limited to this. For example, a discharge pipe is connected in series to a reciprocating compressor having a plurality of cylinders, and the compressed air discharged from the previous stage compressor is further compressed by the reciprocating compressor having a plurality of cylinders in the next stage. The multi-stage compression may be performed.

  Moreover, in the said embodiment, it comprised using the unload mechanism 11 which switches the driving | running state of the compressor main body 3 between a load driving | operation and a no-load driving | operation according to the pressure value detected with the pressure sensor 22 as a switching mechanism. . However, the present invention is not limited to this, and is configured by using an inverter control circuit or the like that switches the driving, stopping, and rotation speed of the motor 8 according to the pressure value detected by the pressure sensor 22 as a switching mechanism instead of the unload mechanism. May be. Moreover, when using an unload mechanism and an inverter control circuit together, you may comprise a switching mechanism using both of these.

In the embodiment, the air tank 27 is used as a storage tank connected to the compressor body 3. However, the present invention is not limited to this, not good if the reservoir tank for storing compressed gas.

Furthermore, in the said embodiment, the package type air compressor was mentioned as an example and demonstrated as a gas compressor. However, the present invention is not limited thereto, but vacuum pump, can be widely applied to a refrigerant compressor or the like, for example.

It is a front view shown in the state where the package type air compressor by an embodiment of the invention was connected to the external air tank. It is a partially broken front view which shows the air compressor in FIG. 1 alone. FIG. 3 is an enlarged cross-sectional view of a main part when the cylinder head of the compressor body is viewed from the direction of arrows III-III in FIG. 2. It is a front view of the principal part expansion which expands and shows the orifice etc. in FIG. It is a side view of the principal part expansion which looked at the orifice etc. from the arrow VV direction in FIG. It is a rear view of the principal part expansion which looked at the orifice etc. from the arrow VI-VI direction in FIG. It is sectional drawing which shows the orifice in FIG. 4 alone. It is the top view which looked at the orifice from the arrow VIII-VIII direction in FIG.

Explanation of symbols

1 Package 3 Compressor body (compression unit)
6 Cylinder head 6A Intake valve 6B Discharge valve 8 Motor (drive unit)
11 Unload mechanism (switching mechanism)
15 Discharge piping 18 Relief valve 19 Orifice (throttle mechanism)
19A Pressure introduction passage 19B Restriction portion 19C Branch passage 21 Pressure detection pipe (pressure detection passage)
22 Pressure sensor (pressure detector)
23 Unload pipeline (unload passage)
24 Solenoid valve 25 Controller 27 Air tank ( storage tank )

Claims (3)

A package formed in a box shape, a compression unit provided in the package for sucking and compressing gas and discharging compressed gas, a motor provided in the package and driving the compression unit, and provided in the package is in response to said pressure of the compressed gas discharged from the compression unit and a switching mechanism for switching the operating state of the compression unit, the package type gas compressor that does not place a storage tank for storing the compressed gas in said package In
The compression unit is connected to a discharge pipe that discharges the compressed gas toward the storage tank that is located outside the package and connected to the compression unit,
Connected to the discharge pipe is a pressure detection passage for guiding a part of the compressed gas toward the pressure detector provided in the package ,
In the middle of the pressure detection passage, a throttle mechanism for reducing the pressure pulsation of the compressed gas is provided,
The package type gas compressor characterized in that the switching mechanism is configured to switch the operation state of the compression unit according to the pressure value detected by the pressure detector. The switching mechanism is an unload mechanism that switches between a load operation and a no-load operation of the compression unit according to the pressure of the compressed gas discharged from the compression unit,
2. The package type according to claim 1, wherein an unloading passage is branched and connected to the pressure detection passage on an upstream side of the throttle mechanism, and the unloading passage is connected to the unloading mechanism. Gas compressor. The package type gas compressor according to claim 2 , wherein an electromagnetic valve that switches between opening and closing according to a pressure value detected by the pressure detector is provided in the middle of the unloading passage.

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