JP2003254253A - Compressor and maintenance method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil cooled screw type compressor wherein proper maintenance is performed at proper timing for parts required for maintenance. <P>SOLUTION: This compressor is provided with a control device 27 for calculating each of maintenance timings for: a suction filter 11 by determining the number of revolution of a cooling fan 14 from a number of revolution control signal by a discharge air temperature measured by a discharge air temperature gage 24; an oil separation element 6 from differential pressure of discharge air pressure measured by a discharge air pressure gage 22 and supply air pressure measured by a supply air pressure gage 23; and an oil filter 9 from oil flow rate of oil supplied to a compressor main body 1 obtained from a relation of: a suction air temperature measured by a suction air temperature gage 21; a discharge air temperature measured by the discharge air temperature gage 24; and an oil temperature measured by an oil temperature gage 26. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field of a compressor and a maintenance method for the same, in which each of a plurality of maintenance-requiring parts can be maintained at an appropriate time.

[0002]

2. Description of the Related Art A compressor, particularly an oil-cooled screw compressor that uses oil for shaft sealing, lubrication, cooling, etc., contains many parts requiring maintenance (hereinafter referred to as maintenance parts). There is. For example, a suction filter, an oil separation element, an oil filter, oil itself, etc. correspond to maintenance parts that require maintenance. The maintenance timing of each of these maintenance-requiring parts differs depending on the usage condition of the compressor, etc., but in reality, maintenance is performed regularly.

[0003]

As described above, the suction filter of the compressor, the oil separation element, the oil filter, the electric motor for driving the compressor main body, and the maintenance parts such as the oil itself need to be used as described above. Despite being different depending on the situation, etc., it is regularly maintained. If the maintenance-requiring parts of the compressor are to be regularly maintained, the maintenance-requiring parts, which originally do not require maintenance, are also maintained, resulting in a lot of waste. For example, in the case where the rules for replacement of parts are uniformly set on a regular basis, there is a waste of replacing even maintenance-requiring parts that can be continuously used. This rule of uniform replacement of parts is preferable for stable operation of the compressor,
It is not preferable for its maintenance cost and running cost.

Further, the maintenance itself of the maintenance-requiring parts of the compressor is indispensable to the compressor. If proper maintenance cannot be applied to maintenance-requiring parts at an appropriate time, in the worst case, the compressor will suddenly stop due to a sudden failure due to the life of the maintenance-requiring parts, and It can have a significant impact on the operation and thus on the operation of production lines using compressed gas.

Therefore, an object of the present invention is to provide a compressor and its maintenance that make it possible to perform appropriate maintenance on required maintenance parts of the compressor at an appropriate time regardless of the usage condition of the compressor. Is to provide a method.

[0006]

The present invention has been made in view of the above circumstances, and therefore, in order to solve the above problems, the means adopted by the compressor according to claim 1 of the present invention is: A compressor provided with a compressor body is provided with operating state quantity detecting means for detecting an operating state quantity relating to the operating state of the compressor, and maintenance is required based on the operating state quantity detected by the operating state quantity detecting means. It is characterized in that a calculation means having a function of calculating a predetermined maintenance time of the component is provided.

The means adopted by the compressor according to claim 2 of the present invention is the compressor according to claim 1, wherein at least the compressor body and the cooling fan are enclosed in a package. A package type compressor having a structure in which air is taken in from an air inlet with a filter provided in the package by the rotation of the cooling fan to cool the package, and the operation state amount detecting means determines a rotation speed of the cooling fan. It is a rotation speed detector to be obtained, wherein the operating state quantity is the rotation speed of the cooling fan, and the maintenance-requiring component is the air intake with filter.

The means adopted by the compressor according to claim 3 of the present invention is the compressor according to claim 1, wherein the compressor has an oil separation and recovery device containing at least an oil separation element. In the compressor, the operation state amount detection means is a pressure gauge that detects the pressure before and after the oil separation element, the operation state amount is a differential pressure before and after the oil separation element, and the maintenance required parts. Is the oil separation element.

The means adopted by the compressor according to claim 4 of the present invention is the compressor according to claim 1, wherein the compressor is an oil-cooled compressor having an oil flow path in which an oil filter is interposed. In the compressor, the operating state amount detecting means is a suction thermometer provided on the suction side of the compressor body, a discharge thermometer provided on the discharge side of the compressor body, and an oil supply provided on the oil flow path. It is a thermometer, and the operating state amount is obtained based on the suction temperature detected by the suction thermometer, the discharge temperature detected by the discharge thermometer, and the oil supply temperature detected by the oil supply thermometer. The oil flow rate of the oil flowing through the oil flow path, and the maintenance-requiring component is the oil filter.

The means adopted by the compressor maintenance method according to claim 5 of the present invention measures the operating state quantity relating to the operating state of the compressor, and determines the required maintenance parts based on the measured operating state quantity. It is characterized by determining the maintenance period of.

The means adopted by the compressor maintenance method according to claim 6 of the present invention is the compressor maintenance method according to claim 5, wherein at least the compressor body and the cooling fan are packaged in the compressor. A package type compressor having a structure in which air is taken in from an air inlet with a filter provided in the package by the rotation of the cooling fan and cooled by rotation of the cooling fan. And the predetermined maintenance is the maintenance of the air intake with filter.

The means adopted by the compressor maintenance method according to claim 7 of the present invention is the compressor maintenance method according to claim 5, wherein the compressor has at least an oil separation element incorporated therein for oil separation and recovery. An oil-cooled compressor having a container, wherein the operating state amount is a differential pressure before and after the oil separation element, and the predetermined maintenance is maintenance of the oil separation element.

The means adopted by the compressor maintenance method according to claim 8 of the present invention is the compressor maintenance method according to claim 5, wherein the compressor is an oil flow passage having an oil filter interposed therein. In the oil-cooled compressor, the operating state quantity is obtained by calculation, is an oil flow rate of oil flowing through the oil flow path, and the predetermined maintenance is maintenance of the oil filter. To do.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The configuration of a compressor according to an embodiment for carrying out the maintenance method of the present invention will be described below in the case where the compressor is an oil-cooled screw compressor (hereinafter referred to as a compressor). As an example, description will be given with reference to FIG.

FIG. 1 shows a compressor according to an embodiment for carrying out the maintenance method of the present invention. This compressor has a rotor casing having a pair of male and female screw rotors (not shown) incorporated therein. A machine body 1 is provided. An output shaft of the electric motor 2 whose rotation speed is controlled by an inverter 15 is connected to a shaft of one of the screw rotors (usually a male rotor) via a coupling (not shown). Suction port 3 of the compressor body 1
A suction channel 10 is connected to the suction channel 10.
A suction filter 11 that removes foreign matters such as dust contained in the suction air, which is suction gas, is installed in the engine.

The discharge port 4 of the compressor body 1 has
A discharge flow path 12 that communicates with a compressed air supply destination that is a discharge gas supply destination is connected, and an oil separation / recovery device 5 described later is interposed in the discharge flow path 12. An oil separation element 6 for separating oil from discharge air containing oil discharged from the compressor body 1 is arranged above the inside of the oil separation / collector 5, and below the inside of the oil separation element 6. An oil sump 7 for storing the separated oil is formed.
The compressed air from which the oil content has been removed by passing through the oil separation element 4 is supplied to the compressed air supply destination through the suction passage 10.

Further, the oil sump portion 7 of the oil separation and recovery unit 5
An oil passage 13 described later communicates with the compressor body 1. An oil cooler 8 cooled by a cooling fan 14 and an oil filter 9 are installed in the oil flow path 13 to cool the oil stored in the oil sump 7 to a predetermined temperature. The sludge and the like are removed and supplied to the compressor body 1. The oil supply points are a compression space (not shown) of the compressor body 1, a shaft seal portion, a bearing, and the like.

The operation of the compressor having such a structure is controlled by the compressor control device 20. That is, the compressor control device 20 has the suction passage 10
Is disposed on the downstream side of the suction filter 11 of the
Suction air thermometer 2 to measure the temperature of the suction air flowing through
1. A motor thermometer 25 for detecting the temperature of the electric motor 2 is provided. Further, a supply air pressure gauge 23, which is provided in the discharge flow path 12 and measures the pressure of the supply air from which the oil content has been removed by passing through the oil separation element 4, is provided. A discharge air pressure gauge 22, which is provided in the oil separation / recovery device 5 and measures the pressure and temperature of the discharge air in the oil separation / recovery device 5,
A discharge air thermometer 24 is provided. Furthermore, the oil flow path 13
The oil supply thermometer 26 is provided upstream of the oil cooler 8 and measures the temperature of the oil flowing through the oil flow path. These measuring instruments are the operation state detecting means of the compressor.

Then, the suction air thermometer 21, the discharge air pressure gauge 22, the supply air pressure gauge 23, and the discharge air thermometer 2
4, a motor thermometer 25, and a controller 27 to which the detected values from the oil supply thermometer 26 are input. This controller 27
Is a signal for controlling the rotation speed of the electric motor 2 to the inverter 15 and a detection value input from the refueling thermometer 26, that is, a signal for controlling the rotation of the cooling fan 14 according to the oil temperature. It is what is output. Further, it is configured to perform a calculation relating to a maintenance time of a plurality of maintenance-requiring parts described later and display the calculation result on a display means such as a display (not shown).
In addition to the display means, the controller 27 may be provided with a voice generating means, a warning generating means, or the like.

The maintenance-requiring parts which are the objects of the calculation relating to the maintenance timing by the controller 27 are as follows. Suction filter (clogging) Oil separation element (clogging) Oil filter (clogging) Hereinafter, the maintenance timing of the maintenance required parts performed by the controller 27 will be described in more detail.

First, regarding the suction filter (clogging),
The horizontal axis indicates time (h), and the vertical axis indicates the rotation speed of the cooling fan (r
pm) of the cooling fan rotational speed, which will be described with reference to FIG. When the compressor is a package type and the compressor body 1 is an oil-cooled screw compressor, the rotation speed of the cooling fan 14 is controlled while measuring the temperature of the discharge air with the discharge air thermometer 24. The temperature of the discharge air is controlled so that water does not condense in the compressed air. More specifically, when the temperature of the discharge air is high, the rotation speed of the cooling fan 14 is increased to increase the cooling air volume, and conversely, when the temperature of the discharge air is low, the cooling fan 14 is increased.
The rotation speed of is reduced to reduce the cooling air volume.

When the suction filter 11 is clogged during the above-described control operation of the compressor, the inside of the soundproof cover becomes negative pressure. Therefore, the pressure difference between the suction side and the discharge side of the cooling fan 14 increases, the amount of cooling air decreases, and the temperature of the discharge air rises. Then, in order to prevent the temperature of the discharge air from rising, the rotation speed of the cooling fan 14 is controlled to a high speed based on the measured temperature output from the discharge air thermometer 24. Therefore, the cooling fan 14
When the number of rotations of the suction filter 11 increases with time,
Is clogged, the remaining life of the suction filter 11 can be calculated from the rising curve of the rotation speed of the cooling fan 14.

For example, if the rotation speed of the cooling fan 14 is as shown in FIG.
It is assumed that it is rising by drawing a rising curve as shown in. The solid line shown in FIG. 2 indicates the actual rotation speed of the cooling fan 14. Further, the broken line is a curve estimated from a plurality of points in the solid line by Lagrange interpolation or the like, and is, so to speak, a leveled transition of the rotational speed of the cooling fan 14.

By the way, the rotational speed of the cooling fan 14 is calculated and calculated by an arithmetic unit having an arithmetic function of the controller 27, and the rotational speed control transmitted to the cooling fan 14 is controlled. The signal is based on the calculated rotational speed. In the case of the compressor according to this embodiment,
In order to suppress the number of parts as much as possible, a rotation speed detector such as a rotary encoder is not provided. However,
A method of providing the cooling fan 14 with a rotation speed detector such as a rotary encoder and obtaining the actual rotation speed of the cooling fan 14 from the rotation speed signal output from the rotation speed detector can naturally be adopted.

The controller 27 calculates the maintenance timing of the suction filter 11, that is, the replacement timing, and displays the necessity of the replacement on a display means such as a display device (not shown). The controller 27 is also provided with an input switch (not shown). This input switch is for transmitting to the controller 27 that the maintenance of the suction filter 11 is finished and the calculation of the next maintenance time is newly started.

That is, when mounting the suction filter 11 first and then starting the operation of the compressor, the user of the compressor controls that the calculation of the maintenance timing of the installed suction filter 11 is newly started. Press the input switch to transmit to the instrument 27. As a result, the controller 27 newly starts calculation of the maintenance timing of the suction filter 11. Note that the suction filter 11 is usually not removed from the time it is installed until it is replaced. Therefore, a limit switch is attached at a position adjacent to the frame portion of the suction filter 11, and the limit switch is
The controller 27 may be configured to recognize that the suction filter 11 has been removed when it becomes FF.

The filter replacement timing calculation method 1 will be explained. The controller 27 has the initial life value L ₀ of the suction filter 11.
Has been entered. When the suction filter 11 is replaced
It is assumed that the elapsed time from (at the time of pressing the input switch) is t, and the rotation speed of the cooling fan 14 at the time when t time has elapsed is R _t .

Here, the controller 27 controls the unit time of Δt.
The number of rotations of the cooling fan 14 was sampled n times at intervals.
Then, the elapsed time t until sampling is performed n times
Is t = n × Δt. Also, when t time has elapsed
The life of the suction filter 11 is L _tIf this is
Built-in filter 11 life L_tCan be expressed by the following formula
Wear.   L_t= L₀-CΣR_iΔ_tΔt ‥‥‥‥‥‥‥‥‥‥‥‥ The lowercase letter c in the above formula is an arbitrary constant.
The lowercase letter i is an integer from 0 to n. Perform the above formula
By calculating, the life L of the suction filter 11_tIs predetermined
Display device of the controller 27 when it becomes shorter than the threshold value of
Said that maintenance of the suction filter 11 is required.
Is displayed.

Next, the filter replacement timing calculation method 2 will be described. First, as shown by the chain double-dashed line in FIG. 2, the upper limit value R _th of the rotational speed of the cooling fan 14 is set as a guideline for the life of the suction filter 11. deep. The time (time when maintenance is required) L _th when the rotation speed of the cooling fan 14 reaches the upper limit R _th is obtained by sampling the rotation speed of the cooling fan 14. It should be noted that what is obtained by this filter replacement timing calculation method 2 is not the life of the suction filter 11 itself, but the time when the life of the suction filter 11 is exhausted.

That is, when the suction filter 11 is replaced
This point is defined as 0 point (when the input switch is pressed).
It is assumed that the elapsed time from the point is t and the rotation speed of the cooling fan 14 at the time when the time t has elapsed is R _t . Here, assuming that the controller 27 samples the rotation speed of the cooling fan 14 n times for each unit time of Δt, the elapsed time t up to the time of sampling n times is the same as in the case of the above filter replacement timing calculation method 1. Then, t = n × Δt. in this case,
The time L _{th at} which maintenance of the suction filter 11 is required can be calculated by the following equation.

[0031] _{L th = (R th -R (} n-1) Δ t) × {Δt / (R n Δ t -R (n-1) Δ t)} + (n-1) Δt ‥‥‥‥ However, when L _th ≧ L ₀ in the above equation, L _th = L ₀ is set, and further, R _{n Δt} ≦ R _(n-1) Δ _t . Note that the above equation is expressed as y−R _(n−1) Δ _t = {(R _n
The equation of _{Δ t -R (n-1)} Δ t) / Δt} × {x- (n-1) Δt}, those obtained by rearranging introducing y = R _th.

The reason why the above equations and equations are used in the calculation of the time L _th at which the maintenance of the suction filter 11 is required is as follows. That is, the time L _th at which the maintenance of the suction filter 11 is required only by the above formula.
In the above equation, the solution of the time L _th based on the equation cannot be obtained or the value of the time L _th becomes negative. Therefore, in the above case, the initial value L ₀ of the life of the suction filter 11 is set to L _th and the equation is used as described above.

Therefore, the controller 27 controls the suction filter 1
The elapsed time t after the replacement of 1 is compared with the time L _th obtained by the calculation, and when the difference becomes smaller than a predetermined threshold value, it is determined that it is the replacement time. This allows
The determination result that “maintenance of the suction filter 11 is necessary” is displayed on the display device provided in the controller 27.

By the way, in the above, the main maintenance component of the compressor is the suction filter 11 attached to the air intake of the soundproof cover, and the "state quantity related to the operating state of the compressor" used for determining the replacement time is cooling. The two calculation method in the case of the rotation speed of the fan 14 has been described. However, the idea regarding the filter replacement timing calculation method can be applied not only to the determination of the maintenance timing of the suction filter 11 but also to the determination of the maintenance timing of other maintenance-requiring parts.

More specifically, in order to determine the maintenance timing of a certain maintenance-requiring component of the compressor, the "state quantity relating to the operating state of the compressor" involved in the maintenance component is directly or indirectly detected. . And
Initial life of maintenance required parts (L _{0 in the} above example)
By predetermining a constant value and an arbitrary constant (c in the above example), it is possible to determine the maintenance timing of the maintenance-requiring parts of the compressor in accordance with the calculation method 1. Further, if the initial value of the service life of the maintenance-requiring parts (L _{0 in the} above example) and the upper limit value of the state quantity (R _{th in the} above example) are determined in advance, the compressor can be processed in accordance with the above calculation method 2. It is possible to determine the maintenance period of the maintenance required parts.

Regarding the oil separation element (clogging), the horizontal axis represents time (h), and the vertical axis represents the differential pressure between the discharge air pressure gauge 22 and the supply air pressure gauge 23. This will be described with reference to FIG. If the discharge air discharged from the compressor body 1 contains dust, the oil separation element 6 will be clogged, and the differential pressure before and after the oil separation element 6 will become large. When the differential pressure increases,
Since the element rear pressure measured by the supply air pressure gauge 23 is controlled to be constant, the element front pressure detected by the discharge air pressure gauge 22 increases and the compressor body 1 becomes overloaded. Therefore, it is possible to monitor the change over time of the differential pressure and calculate the remaining life of the oil separation element 6 from the rising curve of the differential pressure.

A specific calculation method for calculating the remaining life of the oil separation element 6 from the differential pressure rising curve is the above filter replacement timing calculation method 1 in which the clogging of the suction filter 11 is judged from the rotation speed of the cooling fan 14. It is similar to the case of 2. That is, assuming that the pressure measured by the discharge air pressure gauge 22 is Pd ₂ and the pressure measured by the supply air pressure gauge 23 is Pd ₃ , the differential pressure D is D = Pd ₂ −P
Although represented by d ₃ , the differential pressure D is shown by a solid line in FIG. Further, the broken line is a curve estimated by Lagrange interpolation or the like from a plurality of points in the solid line in FIG. 3, as in the case of the broken line in FIG.

The controller 27 calculates the maintenance time of the oil separation element 6 and displays the necessity of the maintenance on a display means such as a display device (not shown). The controller 27 is also provided with an input switch (not shown). This input switch
This is to inform the controller 27 that the maintenance of the oil separation element 6 is finished and the calculation of the next maintenance time is newly started. More specifically,
When the operation of the compressor is started after the installation of the oil separation element 6 is completed, the user of the compressor newly starts the calculation of the maintenance time.
Press the input switch to transmit to. As a result, the controller 27 newly starts the calculation of the maintenance time of the oil separation element 6.

The element replacement timing calculation method 1 will be described below. The controller 27 is supplied with the initial life value Le ₀ of the oil separation element 6. Oil separation element 6
It is assumed that the elapsed time from the time of exchanging (the time when the input switch is pressed) is t, and the differential pressure at the time when t has elapsed is D _t . Here, assuming that the controller 27 samples the differential pressure n times for each unit time of Δt, the elapsed time t until sampling n times is t = n × Δt. Further, the lifetime of the oil separating element 6 when the elapsed time t is assumed to be Le _t, life Le _t of oil separating element 6 can be calculated by the following equation. _{Le t = Le 0 -c'ΣD i Δ} t Δt ‥‥‥‥‥‥ However, a lowercase c 'is an arbitrary constant in the formula,
The lowercase letter i is an integer from 0 to n. By calculating this equation, the life of the oil separation element 6 Let _t
When becomes smaller than a predetermined threshold value, the display of the controller 27 indicates that "maintenance of the oil separation element 6 is necessary".

Next, the element replacement timing calculation method 2 will be described. First, as shown by the alternate long and two short dashes line in FIG. 3, the upper limit value D _{th of the} differential pressure is used as a guide for the life of the oil separation element 6.
Is set. The time t _{th at} which the differential pressure reaches the upper limit value D _th is obtained by sampling the differential pressure. Oil separation element 6
Is set as the zero point, and the elapsed time from the zero point is t
And the differential pressure after the elapse of time _t is D _t . Here, assuming that the controller 27 samples the differential pressure n times for each unit time of Δt, the elapsed time t until sampling n times is t = n × Δt. Then, the time required for maintenance Le _th can be calculated by the following formula.

Le _th = (D _th −D _(n-1) Δ _t ) × {Δt / (D _n Δ _t −D _(n-1) Δ _t )} + (n−1) Δ t. If Le _th ≧ Le ₀ in the above formula, then Le _th = Le ₀ and D _{n Δt} ≦ D _(n-1) Δ _t . The above formula is used for the following reason. If it is attempted to derive the timing Le _th required for maintenance of the oil separation element 6 only by the above equation, in the case of the above equation, the solution of the timing Le _th based on the equation cannot be obtained, or the timing Le _th The value becomes negative. Therefore, in the above case, the initial value Le ₀ of the life of the oil separation element 6 is set to Le _{th as} described above.
And the formula is used.

Therefore, the controller 27 controls the oil separation element 6
The elapsed time t and the time from when the exchange is compared with the Le _th,
When the difference becomes smaller than a predetermined threshold value, it is determined that it is the replacement time. As a result, the determination result that "maintenance of the oil separation element 6 is necessary" is displayed on the display device.

A method for calculating the filter replacement time of the oil filter 9 will be described. When the oil filter 9 is clogged, the amount of oil supplied to the compressor body 1 is reduced. In the case of an oil-cooled screw compressor, since the air is cooled with oil, the temperature of the discharge air rises when the amount of oil supply decreases. Generally, the intake air temperature T _s , the discharge air temperature T _d , the oil supply temperature T _0, and the oil supply amount q have the following relationships. q = {W−C ₂ × Q × (T _d −T _s )} / {C ₁ × (T _d −
T ₀ )} In the above formula, the uppercase letter Q is the air amount (considered as a constant), the uppercase letter W is the compression power (considered as a constant), and the uppercase letters C ₁ and C ₂ are both constants. is there.

The degree of clogging of the oil filter 9 can be known from the oil supply amount q in the above equation. That is, the remaining life of the oil filter 9 can be calculated from the amount of oil supply q.
In this case, the maintenance component that determines the maintenance timing is the oil filter 9, and the "state quantity related to the operating state of the compressor" used in the calculation for determining the maintenance timing is the oil supply amount q.

That is, as described above, the oil supply amount q is changed to the suction temperature.
T_sAnd the discharge temperature T_dAnd refueling temperature T ₀Indirectly from
Put out. Furthermore, the initial value of the life of the oil filter 9 and an arbitrary value
If you decide in advance the constant and the filter replacement time
Maintenance of the oil filter 9 according to the calculation method 1
The period can be determined. Also, the life of the oil filter 9
Predetermine the initial value and state quantity, that is, the lower limit value of refueling quantity q
If set, follow the above method 2 for calculating the filter replacement time.
The maintenance time of the oil filter 9 can be determined by
You can

When determining the maintenance timing of the oil filter 9 according to the method 2 for calculating the filter replacement timing, it is necessary to determine the lower limit value of the oil supply amount q instead of the upper limit value. The reason is as follows. That is, unlike the case of calculating the maintenance timing of the suction filter 11 and the oil separation element 6 in which the rotation speed of the cooling fan 14 increases and the differential pressure increases, the clogging of the oil filter 9 progresses over time, This is because the amount of oil supply q decreases.

As described above, according to the compressor of the present embodiment, the maintenance timings of the suction filter 11, the oil separation element 6 and the oil filter 9 are obtained as follows. The maintenance timing of the suction filter 11 is obtained from the increase in the rotation speed of the cooling fan 14 calculated from the rotation speed control signal based on the discharge air temperature measured by the discharge air thermometer 24. The maintenance timing of the oil separation element 6 is obtained from the rise of the differential pressure between the discharge air pressure measured by the discharge air pressure gauge 22 and the supply air pressure measured by the supply air pressure gauge 23. The maintenance timing of the oil filter 9 is based on the relationship between the intake air temperature measured by the intake air thermometer 21, the discharge air temperature measured by the discharge air thermometer 24, and the oil temperature measured by the oil supply thermometer 26. It is obtained from the reduction of the oil flow rate of the obtained oil.

According to the compressor of the present embodiment, the maintenance timing of the maintenance-requiring component can be reliably obtained by calculation, so that the following effects can be obtained. Unlike the conventional example of performing regular maintenance, there is no need to perform maintenance on parts that originally do not require maintenance, and waste is eliminated, which greatly contributes to the reduction of compressor maintenance costs and running costs. It has the excellent effect that In addition to being able to prevent a sudden stop of the compressor due to a sudden failure or the like, it is possible to predict in advance the maintenance timing of maintenance-requiring parts.
Therefore, the product manufacturing plan on the production line where the compressed air is supplied will not be confused and the product can be manufactured according to the manufacturing plan. Therefore, the specified number of products must be delivered on time. You can

By the way, in the above description, the compressor main body is driven by the electric motor whose rotation speed is controlled by the inverter, and the discharge amount of the discharge air discharged from the compressor main body is controlled as an example. did. However,
The present invention can be applied to a compressor that controls the discharge amount of discharge air discharged from the compressor body with a slide valve, and is not limited to the form of the compressor according to the above-described embodiment. Further, in the above, various calculation formulas have been shown in order to calculate the maintenance time and life of various maintenance required parts. However, the present invention is not limited to the above arithmetic expression.

[0050]

As described above, according to the compressors according to claims 1 to 4 of the present invention and the compressor maintenance method according to claims 5 to 8 of the present invention, the suction filter and the oil are calculated. Appropriate maintenance timings for maintenance-requiring parts such as separation elements and oil filters can be obtained. Therefore, unlike the conventional example that regularly performs maintenance, there is no need to perform maintenance on parts that originally do not require maintenance, and waste is eliminated, which greatly contributes to reduction of maintenance cost and running cost of the compressor. There is an excellent effect that can be done.

According to the compressors according to claims 1 to 4 of the present invention and the compressor maintenance method according to claims 5 to 8 of the present invention, a sudden stop of the compressor due to a sudden failure or the like is caused. In addition to being able to prevent it, it is possible to predict in advance the maintenance timing of maintenance-requiring parts. Therefore, the product manufacturing plan on the production line at the compressed gas supply destination will not be confused and the product can be manufactured according to the manufacturing plan. Therefore, the specified number of products must be delivered on time. You can

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory diagram of a compressor according to an embodiment for carrying out a maintenance method of the present invention.

FIG. 2 is an explanatory diagram of the change over time of the cooling fan rotation speed, showing the time (h) on the horizontal axis and the rotation speed (rpm) of the cooling fan on the vertical axis according to the embodiment of the present invention. .

FIG. 3 relates to the embodiment of the present invention, and shows the change over time of the differential pressure, in which the horizontal axis represents time (h) and the vertical axis represents the differential pressure between the discharge air pressure gauge and the supply air pressure gauge. It is a figure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Compressor body, 2 ... Electric motor, 3 ... Suction port, 4 ... Discharge port, 5 ... Oil separation / collector, 6 ... Oil separation element, 7 ...
Oil sump, 8 ... Oil cooler, 9 ... Oil filter, 10 ... Suction passage, 11 ... Suction filter, 12 ... Discharge passage, 13 ...
Oil passage, 14 ... Cooling fan, 15 ... Inverter, 20 ...
Compressor control device, 21 ... suction air thermometer, 22 ... discharge air pressure gauge, 23 ... supply air pressure gauge, 24 ... discharge air thermometer, 25 ... motor thermometer, 26 ... refueling thermometer, 27 ... controller.

Continued front page    F term (reference) 3H029 AA02 AA03 AA04 AA05 AA06                       AA07 AA09 BB01 BB34 BB35                       CC24 CC43 CC55 CC58 CC62                 3H045 AA05 AA09 AA12 AA26 BA41                       CA03 CA09 CA19 CA20 CA29                       EA34

Claims (8)

[Claims] 1. A compressor provided with a compressor body, wherein operating state quantity detecting means for detecting an operating state quantity relating to an operating state of the compressor is provided, and an operating state quantity detected by this operating state quantity detecting means. A compressor provided with a calculating means having a function of calculating a predetermined maintenance time of a maintenance-requiring component based on the above. 2. The compressor is configured such that at least the compressor body and a cooling fan are enclosed in a package, and air is taken in from a filter-equipped air intake provided in the package by rotation of the cooling fan. A package type compressor having a cooling structure, wherein the operating state amount detecting means is a rotation number detector for obtaining the number of rotations of the cooling fan, and the operating state amount is the number of rotations of the cooling fan,
The compressor according to claim 1, wherein the maintenance-requiring component is the air inlet with the filter. 3. The compressor is an oil-cooled compressor having an oil separation / recovery device containing at least an oil separation element, and the operation state amount detection means detects pressure before and after the oil separation element. The compressor according to claim 1, wherein the compressor is a pressure gauge, the operating state amount is a differential pressure across the oil separation element, and the maintenance-requiring component is the oil separation element. 4. The compressor is an oil-cooled compressor having an oil flow path with an oil filter interposed, and the operating state amount detecting means is a suction temperature provided on a suction side of a compressor body. Meter, a discharge thermometer provided on the discharge side of the compressor body, and an oil supply thermometer provided in the oil flow path, wherein the operating state amount is the suction temperature detected by the suction thermometer, and the discharge It is the oil flow rate of the oil flowing through the oil flow path, which is obtained based on the discharge temperature detected by a thermometer and the oil supply temperature detected by the oil supply thermometer, and the maintenance required part is the oil filter. The compressor according to claim 1, wherein: 5. A method of maintaining a compressor, characterized in that an operating state quantity relating to an operating state of the compressor is measured, and a predetermined maintenance timing of a maintenance-needed component is determined based on the measured operating state quantity. 6. The compressor includes at least a compressor body and a cooling fan enclosed in a package, and air is taken in from a filter-equipped air intake provided in the package by rotation of the cooling fan. A package type compressor having a cooling structure, wherein the operating state quantity is a rotation speed of the cooling fan, and the predetermined maintenance is maintenance of the air inlet with a filter. Maintenance method for the described compressor. 7. The compressor is an oil-cooled compressor having an oil separation / recovery device containing at least an oil separation element, wherein the operating state quantity is a differential pressure before and after the oil separation element, The compressor maintenance method according to claim 5, wherein the predetermined maintenance is maintenance of the oil separation element. 8. The compressor is an oil-cooled compressor having an oil flow passage having an oil filter interposed therein, and the operation state quantity is obtained by calculation. The oil of the oil flowing in the oil flow passage is calculated. The method for maintaining a compressor according to claim 5, wherein the maintenance is a flow rate, and the predetermined maintenance is maintenance of the oil filter.