JP2018031267A - Package type compressor - Google Patents

Abstract

Provided is a package-type compressor for outdoor installation that can prevent a decrease in the life of electrical components by suppressing an increase in the temperature inside the apparatus due to the radiant heat of sunlight while ensuring a waterproof and dustproof structure in outdoor installation. A compressor body that compresses air, a motor that drives the compressor body, a cooling fan that cools the compressed air, a fan motor that drives the cooling fan, and an opening that covers these and communicates with outside air A package-type compressor having a temperature sensor for detecting an in-machine temperature provided in the housing, and a control device for controlling the fan motor in accordance with the in-machine temperature. The control device controls the cooling fan to start when the internal temperature detected by the temperature sensor is equal to or higher than a predetermined value when the compressor is stopped. [Selection] Figure 3

Description

  The present invention relates to a package type compressor for outdoor installation.

  In general, a package type air compressor is composed of a compressor body that compresses air, a motor that drives the compressor body, an electric box that houses electrical components, and the like, and ventilation and compressed air in the machine room, A cooling chamber for cooling the lubricating oil is provided. As an example of the layout of such a package type compressor, there is a structure in which a cooling fan is arranged in an upper part of a machine room. The cooling system of this structure is equipped with a cooling fan on the cooling chamber side and a cooler that performs heat exchange. The cooling fan takes in cooling air from the intake port provided on the side of the machine room, sends it to the heat exchanger, and sends compressed air. And cooling the lubricating oil. Then, the exhaust is discharged upward to the atmosphere so as not to enter the intake port from the exhaust port provided in the ceiling cover of the compressor unit.

  As a packaged oil-type compressor installed outdoors, for example, Japanese Patent Application Laid-Open No. 2011-21521 (Patent Document 1) discloses a structure in which rainwater is prevented from entering the machine. .

JP 2011-21521 A

  The motors, electrical components, and lubricants that make up the package-type oil-filled compressor are provided with upper temperature limits to satisfy their functions, so that these components do not exceed the upper temperature limits during operation of the compressor. Cooling by a cooling fan. However, when the compressor is shut down, the temperature inside the machine is likely to rise until the motor, electrical parts, and lubricating oil exceed the maximum temperature due to the radiant heat of sunlight. May become early, and it may occur early during compressor operation. Patent Document 1 does not consider the temperature rise during the shutdown of these compressors.

  In general, as a method to suppress the temperature rise in the machine, it is considered to increase the clearance area of the opening with the outside air and improve the ventilation with the inside, but it is necessary to ensure waterproof and dustproof from the surface of outdoor installation Therefore, it is desirable that the gap area of the opening is as narrow as possible.

  An object of the present invention is to provide a package type compressor that suppresses a rise in the internal temperature due to the radiant heat of sunlight, etc., and reduces the lifetime reduction of electrical components while securing a waterproof and dustproof structure in outdoor installation. is there.

  In order to achieve the above object, the present invention, for example, can be exemplified by a compressor body that compresses air, a motor that drives the compressor body, a cooling fan that cools compressed air, and a cooling fan. A package type compressor including a fan motor that drives the motor and a housing having an opening that covers these and communicating with outside air, and a temperature sensor for detecting an in-machine temperature provided in the housing; A control device that controls the fan motor in accordance with the in-machine temperature, and the control device starts operation of the cooling fan when the in-machine temperature detected by the temperature sensor is equal to or higher than a predetermined value when the compressor is stopped. To control.

  According to the present invention, it is possible to provide a package-type compressor that suppresses an increase in the temperature inside the machine and reduces a decrease in the lifetime of an electrical component while securing a waterproof and dustproof structure when installed outdoors.

It is a figure which shows the whole structure of the package type compressor for outdoor installations based on Example 1. FIG. It is a figure which shows the control block diagram of the cooling fan variable speed control type of the package type compressor for outdoor installations based on Example 1. FIG. FIG. 3 is a control flow diagram of a cooling fan variable speed control type for an outdoor installation package compressor according to the first embodiment. It is a figure which shows the control block diagram of the cooling fan ON / OFF control type of the package type compressor for outdoor installation which concerns on Example 2. FIG. FIG. 6 is a control flow diagram of a cooling fan ON / OFF control type of an outdoor installation package compressor according to a second embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing the overall structure of a package type compressor for outdoor installation. In FIG. 1, the packaged compressor includes a machine room 5 and a cooling room 9, which are covered with a soundproof cover 10 for suppressing the propagation of noise to the outside of the machine.

  The machine room 5 includes a compressor body 2 that generates compressed air on a base 1 that serves as a base, a motor 3 that drives the compressor body 2, and an electric box 4 that houses electrical components. The cooling chamber 9 includes an air cooler 6 for cooling the compressed air, an oil cooler 7 for cooling the lubricating oil, and a cooling fan 8 that sucks the cooling air for cooling them.

  The soundproof cover 10 constitutes a casing that covers the compressor body 2, the motor 3, the air cooler 6, the oil cooler 7, and the cooling fan 8, and a soundproof effect is obtained by covering a configuration that can be a noise source. . The cooling fan 8 takes in outside air from the air inlet 50 provided in the machine room 5, and once passes through the machine room 5 and takes in cooling air from the air intake duct 11, so that the temperature rise in the machine room 5 can be kept low. There is a merit that can be done.

  The compressor body 2 has a male and female rotor 12, and the air sucked from the machine chamber through the suction filter 13 and the suction throttle valve 14 is compressed by the rotor 12. At this time, lubricating oil is sprayed into the compressor body 2 for cooling the rotor 12 and sealing between the rotors 12, and the compressed air mixed with this lubricating oil is then fed by the oil separator 15. Further, it is separated from the lubricating oil, cooled by an air cooler via a pipe 16 and supplied to a user from a discharge pipe 17. On the other hand, the lubricating oil in the oil case 18 is sent to the compressor body via the pipe 2a and the pipe 3a using the pressure difference between the primary side and the secondary side of the rotor 12, and sprayed again on the rotor. ing.

  Here, the cooling of the compressed air by the air cooler 6 and the cooling of the lubricating oil by the oil cooler 7 are performed by allowing the outside air from the inlet 50 provided in the machine room 5 to pass through the machine room 5 by the cooling fan 8 once. After the inside of the chamber 5 is ventilated, the cooling air taken in from the intake duct 11 is passed through each cooler for heat exchange.

  Furthermore, the air that has exchanged heat with the cooler circulates into the air intake 50 provided in the machine room 5 and is not sucked again, so that it is located above the exhaust port 19 at the upper part of the cooling chamber provided in the soundproof cover on the ceiling side. Exhausted.

  That is, on the side surface of the casing (soundproof cover 10), outside air is taken into the machine room using an opening communicating with the inside and outside of the casing as an intake port 50, and an opening on the ceiling surface of the casing is used as an exhaust port 19 to form the casing. The inside of the casing is cooled by being exhausted from above.

  As a feature of the package type compressor for outdoor installation, in order to prevent rainwater from entering the exhaust port 19, an exhaust chamber 20 is provided at the upper part of the exhaust port, and the cooling that has passed through the air cooler 6 and the oil cooler 7 is provided. The wind passes through the shielding plate 21 and is blown to the exhaust port 22. The shielding plate 21 minimizes the intrusion of rainwater into the exhaust chamber 20. Rainwater entering from the exhaust port 22 is once received by the duct 23, passes through the groove 24, and is drained below the base through the drainage channel 25 and the drainage hole 26. A space 27 is provided on the left side of the package in order to prevent water from entering the air inlet 50 provided in the machine room 5, and rainwater that enters from the air inlet 60 provided in the space 27 is based on the drain hole 28. Drained down. A filter 29 is installed at the intake port 50.

  In general air compressor capacity control, the pressure sensor 30 provided in the discharge pipe 17 is used to control the amount of air used on the user side (hereinafter referred to as load factor) by the following method.

  When driving the motor at a constant speed: When the pressure sensor 30 reaches a certain pressure Pa during the load operation of the compressor, the valve plate of the suction throttle valve 14 is closed and the pressure in the oil case 18 is communicated with the atmosphere. The solenoid valve (not shown) discharges air and performs no-load operation. When the pressure drops to a predetermined pressure Pb, the release of air is stopped, the valve plate of the suction throttle valve 14 is opened, and the load operation is resumed. When the cycle time of the load operation and the no-load operation falls below a certain interval time, the motor operation is stopped and the automatic stop mode is set.

  When the motor is controlled at a variable speed: the rotational speed of the motor is controlled to a certain predetermined pressure Pa. The load factor is calculated based on the number of rotations of the motor at this time. When the rotational speed control range of the motor continues to the minimum state and reaches a predetermined pressure Pc, the motor operation is stopped and the automatic stop mode is set. After the automatic stop, when the pressure drops to Pb, the load operation is resumed in the same manner as when the motor speed is not variable.

  When the air compressor sends out compressed air to the outside of the machine, in order to ensure the dew point temperature of an air dryer (not shown) installed on the outlet side of the discharge pipe 17, the compressed air is a predetermined time when it passes through the discharge pipe 17. It is necessary to keep it below the temperature. In order to detect the temperature of the air sucked into the suction port 31, a temperature sensor 32 is provided in the machine room 5. When the value of the temperature sensor 32 exceeds the upper limit value, the display unit 33 allows the user to ventilate or filter the ambient temperature. The cleaning alarm is displayed.

  When the temperature of the air flowing into the suction port 31 is increased, the temperature of the lubricating oil injected into the compressed air is increased in addition to the temperature of the compressed air, and the life of the lubricating oil is shortened. The ambient temperature (eg, 0 ° C. to 40 ° C.) of the package type compressor generally indicates the temperature near the outside of the machine. The heat becomes higher than the outside of the machine due to heat dissipation (eg, 10 ° C increase). Therefore, in order to prompt the user to lower the ambient temperature, it is desirable that the position where the temperature sensor 32 is installed be provided near the opening as close to the outside air as possible.

  In general, when operating, the temperature difference between outside and inside the machine is constant at a certain load factor, and when the operation is stopped, there is almost no temperature difference between outside and inside the machine. In the case of, the temperature in the machine room rises due to the radiant heat of sunlight, so the temperature difference depends on the solar radiation situation. Further, since the temperature rise in the machine room is considered to be highest at a position farther from the opening, it is desirable to install the temperature sensor 32 at a position farther from the opening, but the temperature difference from the opening can be predicted. For example, it can be installed near the opening.

  In addition, since the motor 3 and the electric box 4 provided in the machine room 5 and the fan motor 34 and the display unit 33 for driving the cooling fan provided in the cooling chamber 9 are respectively set to upper limit temperatures, these parts are cooled. The cooling air volume is set so as not to exceed the upper limit temperature of each component when the load and operating temperature of the air compressor are the highest.

  FIG. 2 shows a control configuration of the cooling fan variable speed control type of the package compressor for outdoor installation according to the present embodiment. In FIG. 2, a two-dot chain line indicates a division of each room, and a solid line indicates a wiring.

  The electric box 4 is provided with a fan inverter 35 and a control board 36, and power is supplied from the user-side electrical equipment 37, and the power supply is turned on / off by a breaker (not shown) from the user-side electrical equipment 37. Has been done. During the compressor operation, an operation frequency instruction is sent from the control device in the control board 36 connected to the fan inverter 35 to the fan inverter 35, and the fan inverter 35 controls the rotational speed of the fan motor 34 in the cooling chamber 9 through the wiring 39. I do.

  Hereinafter, the rotational speed control of the fan motor 34 will be described. The control board 36 transmits a rotation frequency instruction to the fan inverter 35 so that the discharge temperature sensor 40 provided in the machine room 5 is connected by the wiring 41 and the discharge temperature becomes a certain temperature Ta. The discharge temperature sensor 40 is disposed at a position (FIG. 1) immediately after air compression so that the temperature of the lubricating oil becomes relatively high. The temperature of Ta is set to be lower than the upper limit temperature of use of the lubricating oil and higher than the temperature at which no drain is generated at a predetermined pressure. As a result, the cooling fan does not always operate at full speed during the operation of the compressor, and when the load factor of the compressor is small, the rotation speed of the cooling fan is suppressed to reduce power consumption and noise.

  The display unit 33 is connected to the control board 36 by a wiring 42 and includes an operation unit for operating, stopping, and the like. During operation, the motor 3 is driven by the control board 38 by an electromagnetic contactor (not shown) or an inverter (not shown), and the operation of the compressor body 2 is started.

  In this embodiment, the compressor is in operation stop, and the display 33, the control board 36, and the fan inverter 35 are energized even during operation stop. Even when the operation is stopped, the temperature information from the temperature sensor 32 detects that the temperature inside the machine rises, and the fan motor 38 is operated to ventilate the machine. Thereby, the temperature rise in a machine by the radiant heat of sunlight etc. can be suppressed. Further, by controlling the rotational speed of the fan motor 34, it is possible to minimize electric power and noise.

  Next, the control flow of the fan motor 34 during operation stop will be described. FIG. 3 is a flowchart showing the contents of control processing in the control configuration of FIG. 2 in the present embodiment.

  In FIG. 3, first, when the operation is switched to the operation stop mode, the routine proceeds to step 100 and the timer tm1 is counted up. Next, the routine proceeds to step 101 where it is determined whether or not the in-machine temperature sensor is disconnected. If the in-machine temperature sensor is not disconnected, the process proceeds to the next step 102 to determine whether the in-machine temperature T0 is equal to or higher than the in-machine upper limit temperature T1, and if it is equal to or higher than T1, the process proceeds to step 103 and the fan inverter operation is turned on. .

  If the in-machine temperature T0 does not exceed the in-machine upper limit temperature T1, the process returns to step 101 again to determine whether the in-machine temperature sensor is disconnected. After step 103, the process proceeds to step 105 and the timer tm3 is counted up after the fan inverter operation is turned on. Subsequently, the routine proceeds to step 106, where it is determined whether tm3 has elapsed up to the timer threshold tm4 after the fan inverter operation is turned on. If tm4 has not elapsed, step 106 is repeated again to determine whether tm3 has elapsed until tm4.

  When Tm4 has elapsed, the routine proceeds to step 107, where it is determined whether or not the temperature difference between the in-machine temperature T0 and the in-machine temperature T1 at the start of the fan inverter operation is equal to or greater than the temperature difference threshold ΔT. If so, the process proceeds to the next step 108 to determine whether T1> T0. If it is determined that T1> T0, it is determined that the internal temperature can be lowered by operating the fan inverter, and the process proceeds to the next step 110 to start variable speed control of the fan.

  At this time, the in-machine temperature: T3 is set as the control target value. For example, when the in-machine upper limit temperature T1 is 45 ° C., T3 is desirably set to about 43 ° C. with a margin of about 2 ° C. to prevent control hunting. If both step 107 and step 108 are NO, it is determined that the in-machine temperature has not been improved, and the process proceeds to step 109 to display a cleaning instruction due to an in-machine temperature rise or filter clogging on the display unit.

  After step 110, the process proceeds to the next step 111 to determine whether the frequency of the fan inverter is the lowest frequency. If it is not the lowest frequency, step 111 is repeated. When the minimum frequency is reached, the process proceeds to the next step 112, and the minimum frequency start timer tm5 is counted up.

  Next, the routine proceeds to step 113, where it is determined whether tm5 has reached the timer threshold value tm6. If tm6 has not elapsed, step 113 is repeated. If it is determined that the timer threshold value tm6 has been reached, the routine proceeds to step 114 where the operation of the fan inverter is turned off.

  If it is determined in step 101 that the in-machine temperature sensor is disconnected, it is set in advance whether to display the disconnection of the in-machine temperature sensor while the operation is stopped. If the disconnect display is set, the process proceeds to step 116 and displayed. Display a disconnection alarm. If it is selected not to display the disconnection, the discharge temperature sensor can be used instead of the in-machine temperature sensor and the process can proceed to step 102. When substituting the discharge temperature sensor, the temperature is high immediately after the operation is stopped. Therefore, the time from the operation stop until the temperature becomes the same as the in-machine temperature is measured in advance, and the time is set as tm2. Make a decision.

  The sensor that substitutes the in-machine temperature sensor is not limited to the discharge temperature sensor, and any other temperature sensor can be used as long as the temperature difference between the cooling chamber and the machine room can be predicted.

  As described above, the present embodiment includes a compressor body that compresses air, a motor that drives the compressor body, a cooling fan that cools the compressed air, a fan motor that drives the cooling fan, and the like. A package-type compressor including a casing having an opening communicating with the cover outside air, a temperature sensor for detecting the temperature inside the casing, and controlling the fan motor according to the temperature inside the casing When the compressor operation is stopped, the control device controls to start the operation of the cooling fan when the internal temperature detected by the temperature sensor is equal to or higher than a predetermined value.

  It also has a fan inverter that controls the fan motor, and the control device controls the fan inverter to operate the cooling fan when the internal temperature detected by the temperature sensor is equal to or higher than a predetermined value when the compressor is stopped. This is started, and it is determined that the in-machine temperature has decreased to a predetermined value and variable speed control of the fan inverter is started.

  As a result, it is possible to provide a package type compressor that suppresses an increase in the temperature inside the machine and reduces a decrease in the service life of the electrical components while securing a waterproof and dustproof structure in outdoor installation.

  In the present embodiment, a case where the cooling fan is ON / OFF controlled without using the fan inverter in the first embodiment will be described.

  FIG. 4 shows a control configuration when the fan inverter 35 is not configured as compared with FIG. 4, components having the same functions as those in FIG. 2 are given the same reference numerals, and descriptions thereof are omitted.

  In FIG. 4, the fan motor 34 and the user-side power supply equipment 37 are connected via the relay 43, and the relay 43 is operated by the control board 36. Thereby, ON / OFF control of the fan motor 34 is performed.

  Next, the control flow of the fan motor 34 during operation stop in the present embodiment will be described. FIG. 5 is a control flowchart of the cooling fan ON / OFF control type in this embodiment. 5 is different from FIG. 3 of the first embodiment in that step 119 is added instead of step 110 to step 113. Since the others are the same, the description thereof is omitted.

  In FIG. 5, a temperature threshold value T4 is set in advance, and if T1> T0 in step 108, the process proceeds to step 119 to determine whether T4> T0. If NO, return to step 107. When T4> T0, the routine proceeds to step 114 and the cooling fan operation is turned off. As with T3, T4 is desirably a temperature that is somewhat lower than T1 with a certain margin.

Further, in common with the first and second embodiments, in FIG. 3 and FIG. 5, when the in-machine temperature sensor is disconnected after step 102, the following control is performed.
During cooling fan operation: The cooling fan is temporarily stopped and the routine proceeds to step 115.
While cooling fan is stopped: Proceed to step 115.

  Further, the operation stop state is determined by a STOP button (not shown) provided in the operation unit, and it is possible to determine the operation stop even in the case of automatic stop. When the automatic stop is in progress, it is determined that the operation is in progress when the load operation is resumed, and the normal control is resumed. Further, even when the vehicle is stopped at the time of failure, it is possible to determine whether or not a secondary disaster occurs and shift to the control of this embodiment.

  Furthermore, by providing the outside temperature sensor 44 of FIG. 1, it is possible to turn on / off the fan inverter or the fan by the temperature difference from the inside temperature sensor. By grasping the temperature difference between the outside of the machine and the inside of the machine, for example, when the outside temperature T5 is 20 ° C., the operation of the fan inverter and the fan is started when the temperature difference of T0−T5 = ΔT2 exceeds a certain value. Thus, the value of ΔT2 can be kept lower than T1-T5. If both the in-machine temperature and the outside temperature exceed T1, it is not possible to proceed to Step 103, but proceed to Step 109, where it is possible to give an alarm of a high ambient temperature and display a failure.

  Furthermore, although the present Example demonstrated the oil supply type compressor as an example, it is applicable also with a water supply type compressor. Moreover, it is applicable also with the compressor which compresses gas other than air, such as nitrogen.

  Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

1: Base, 2: Compressor body, 3: Motor, 4: Electric box, 5: Machine room, 6: Air cooler, 7: Oil cooler, 8: Cooling fan, 9: Cooling chamber, 10: Soundproof cover, 11 : Intake duct, 12: rotor, 13: suction filter, 14: suction throttle valve, 15: oil separator, 16: piping, 17: discharge piping, 18: oil case, 19, 22: exhaust port, 20: exhaust chamber, 21: Shield plate, 23: Duct, 24: Groove, 25: Drainage channel, 26: Drainage hole, 27: Space, 28: Drainage hole, 29: Filter, 30: Pressure sensor, 31: Suction port, 32: Temperature sensor 33: Display unit, 34: Fan motor, 35: Fan inverter, 36: Control board, 37: Electrical equipment, 39: Wiring, 40: Discharge temperature sensor, 41, 42: Wiring, 43: Relay, 44: Outside the machine Temperature sensor 50 and 60: the intake port

Claims (7)

A compressor body that compresses air; a motor that drives the compressor body; a cooling fan that cools the compressed air; a fan motor that drives the cooling fan; and an opening that covers these and communicates with outside air A package-type compressor comprising a housing,
A temperature sensor for detecting an in-machine temperature provided in the housing;
A control device for controlling the fan motor in accordance with the in-machine temperature;
The control device controls so as to start the operation of the cooling fan when the internal temperature detected by the temperature sensor is equal to or higher than a predetermined value when the compressor is stopped. . The package type compressor according to claim 1,
A fan inverter for controlling the fan motor;
The control device controls the fan inverter to start operation of the cooling fan when the internal temperature detected by the temperature sensor is equal to or higher than a predetermined value when the compressor is stopped, and the internal temperature is predetermined. A package type compressor that starts variable speed control of the fan inverter upon judging that the value has dropped to the value. The package type compressor according to claim 1,
When the compressor operation is stopped, if the internal temperature detected by the temperature sensor is equal to or higher than a predetermined value, the control device turns on the fan motor and starts the operation of the cooling fan. A package type compressor characterized in that it is judged that the temperature has dropped to a predetermined value and the fan motor is turned off to stop the operation of the cooling fan. The package type compressor according to any one of claims 1 to 3,
A display unit;
A filter for dust prevention is provided in the opening,
If the control device fails to detect that the internal temperature has decreased to a predetermined value after a predetermined time after starting the operation of the cooling fan, the control device displays the internal temperature increase or filter clogging on the display unit. A package type compressor characterized by that. The package type compressor according to claim 1,
An outside temperature sensor for detecting outside temperature outside the housing;
The control device controls the cooling fan to start operation when a temperature difference between the internal temperature and the external temperature becomes a predetermined value or more. The package type compressor according to claim 5,
Having a display,
When both the in-machine temperature and the outside temperature exceed a predetermined value, the control device does not start the operation of the cooling fan and displays a warning of a high ambient temperature or a failure on the display unit. Package type compressor. The package type compressor according to any one of claims 1 to 6,
A lubricating oil for cooling the compressed air;
An air cooler for cooling the compressed air;
An oil cooler for cooling the lubricating oil;
The package type compressor, wherein the cooling fan blows cooling air to the air cooler and the oil cooler.

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