JP2015045265A - Water lubrication type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water lubrication type compressor for enabling timely purification of circulation water independently of how environments using the compressor are.SOLUTION: In a water lubrication type compressor 10 where circulation water is circulated between a compressor body 12 and a receiver tank 14, there are provided a water supply circuit 18 including a water demineralizer 16, and communicating an external water supply source with the compressor body 12 and the receiver tank 14, a drain circuit 20 communicated with the receiver tank 14, an electric conductivity sensor 22 for measuring the electric conductivity of the circulation water, and a water supply solenoid valve 24 as opening/closing means for the water supply circuit 18 and a drain solenoid valve 26 as opening/closing means for the drain circuit 20. A control device 40 compares the electric conductivity measured by the electric conductivity sensor 22 with a preset purification information reference value, and allows an information device 50 to inform a person of the necessity for purification when the measured value is equal to or higher than the purification information reference value.

Description

  The present invention relates to a water-lubricated compressor, and in particular, water lubrication for purifying lubricating water while notifying the necessity of purification when the quality of the lubricating water in the water-lubricated compressor needs to be purified. It relates to a compressor.

  Conventionally, in a water circulation type compressor, a pure water apparatus using an ion exchange resin or the like has been used to prevent problems such as clogging of pipes due to precipitation of impurities such as metal ions contained in water introduced from an external water supply source. Passed pure water is introduced as circulating water, and every time the cumulative operation time of the compressor reaches a predetermined time, a method of purifying the circulating water with pure water to improve the quality of the circulating water is performed (for example, Patent Document 1).

JP 2007-218209 A

However, for example, when copper-based materials are used in the compressor lubrication path, if high-purity water that has passed through a pure water device such as an ion exchange resin is used for a long time, copper ions will be dissolved. In some cases, the device was damaged due to the generation of patina on reaction with acid. In addition, the quality of water deteriorated and the equipment was affected by the generation of scale due to the concentration of lubricating water.
In particular, the occurrence of such harmful effects is affected by the indoor environment such as a factory where the compressor is used. Therefore, as described above, every time the cumulative operation time of the compressor reaches a predetermined time, the method of purifying circulating water with pure water is used. Depending on the environment in which the compressor is used, purification may not be in time and the equipment may fail.
Therefore, development of a technology that can purify circulating water in a timely manner is awaited regardless of the environment in which the compressor is used.

The present invention has been made in view of the above circumstances, and its purpose is to provide a technology capable of notifying the necessity of purification of circulating water in a timely manner regardless of the environment in which the compressor is used. It is to provide.
It is another object of the present invention to provide a water lubricated compressor capable of purifying circulating water in a timely manner regardless of the environment in which the compressor is used.

  In order to achieve the above object, the present invention introduces a compressor main body that compresses intake air together with circulating water, compressed air discharged from the compressor main body and circulating water in communication with a discharge port of the compressor main body. And a receiver tank that separates and stores compressed air and circulating water, and a circulating water compressor that circulates the circulating water between the compressor main body and the receiver tank, includes a purified water device, an external water supply source and the compression A water supply circuit communicating with the machine body and the receiver tank; a drain circuit communicating with the receiver tank; electrical conductivity measuring means for measuring the electrical conductivity of the circulating water; opening and closing means for the water supply circuit; Each of the circuit opening / closing means is provided, and the electrical conductivity measured by the electrical conductivity measuring means is compared with a preset purification notification reference value to measure the measured electrical conductivity. There wherein the notifying the need of purification when it is the purification notification reference value or more.

  Further, the level sensor for controlling the water level in the receiver tank, the water supply circuit opening / closing means and the drain circuit opening / closing means are operated to supply water until the water level in the receiver tank reaches the upper limit, until the lower limit is reached. A control means for repeating drainage and a counter for counting the number of times of water supply and drainage, and when notifying the necessity of purification, the control means, until the count number of water supply and drainage by the counter reaches a predetermined number of times of water supply and drainage, The water supply / drainage is repeated.

Further, the level sensor for controlling the water level in the receiver tank, the water supply circuit opening / closing means and the drain circuit opening / closing means are operated to supply water until the water level in the receiver tank reaches the upper limit, until the lower limit is reached. A control means for repeating drainage, and a timer for measuring the time from when the control means started the water supply / drainage, and when notifying the necessity for purification, the control means is determined by the time measured by the timer. The water supply / drainage is repeated until the predetermined number of water supply / drainage is reached.

Here, after notifying the necessity of purification, it is preferable that the control means cancels the notification of the necessity of purification when the water supply / drainage is repeated until the predetermined number of times of water supply / drainage is reached.

  According to the present invention, it is possible to prevent a failure due to the scale by purifying the lubricating water when the electrical conductivity exceeds the purification notification reference value. In addition, copper-based materials are commonly used in equipment that uses water because of their corrosion resistance and low price, but they are lubricated so that copper-based materials are not exposed to high-purity water for a long time. The generation of patina can be suppressed by controlling the purification of water and preventing the purity from becoming too high.

It is a figure which shows the structure of the water lubrication type compressor which concerns on one Embodiment of this invention. It is a figure which shows the control flow of the water lubrication type compressor which concerns on one Embodiment of this invention. It is a time chart which shows operation | movement of each part of the water-lubricated compressor which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration of a water-lubricated compressor according to an embodiment of the present invention. As shown in FIG. 1, the water-lubricated compressor 10 of the present embodiment communicates with a compressor body 12 that compresses intake air together with circulating water, and a discharge port 12 a of the compressor body 12, and is discharged from the compressor body 12. A receiver tank 14 that introduces the compressed air and the circulating water, and separates and stores the compressed air and the circulating water is provided, and the circulating water is circulated between the compressor body 12 and the receiver tank 14. The water-lubricated compressor 10 includes a pure water device 16 as a purified water device (a device for purifying water), a water supply circuit 18 that communicates an external water supply source with the compressor body 12 and the receiver tank 14, and a receiver. A drain circuit 20 communicated with the tank 14, an electrical conductivity sensor 22 as an electrical conductivity measuring means for measuring the electrical conductivity of the circulating water, a feed water electromagnetic valve SV 1 as an opening / closing means for the feed water circuit 18, and the drain circuit 20. A drain electromagnetic valve SV2 is provided as an opening / closing means. In the water-lubricated compressor 10 of this embodiment, the electrical conductivity measured by the electrical conductivity sensor 22 is compared with a preset purification notification reference value, and the measured electrical conductivity is the purification notification reference value. A notification device 50 is provided to notify the necessity of purification when the above is true.

  The water-lubricated compressor 10 of this embodiment further operates the level sensor 32 that controls the water level in the receiver tank 14, the water supply electromagnetic valve 24, and the drain electromagnetic valve 26, respectively, so that the water level in the receiver tank 14 reaches the upper limit. A control device 40 that repeats water supply until reaching the lower limit and drainage until the lower limit is reached, and a water supply / drainage counter 42 that counts the number of water supply / drainage. When the notification device 50 notifies the necessity of purification, the control device 40 The water supply / drainage is repeated until the water supply / drainage count reaches a predetermined number of water supply / drainage. When the water supply / drainage is repeated until the predetermined number of water supply / drainage is reached, the control device 40 cancels the notification of the necessity for purification by the notification device 50.

    Now, the configuration of each part of the water-lubricated compressor of this embodiment will be described in detail. As shown in FIG. 1, a water circulation compressor 10 is connected to a compressor body 12 that compresses compressed air together with circulating water, and a discharge port 12a of the compressor body 12 via a discharge circuit 12b. A receiver tank 14 for introducing compressed air discharged as a gas-liquid mixed fluid with circulating water is provided. The receiver tank 14 is provided with a return circuit 14b for introducing the circulating water separated from the compressed air in the receiver tank 14 into the water supply port 12c of the compressor body 10, and the compressor is provided via the discharge circuit 12b and the return circuit 14b. Circulating water is circulated between the main body 10 and the receiver tank 14. The water circulation compressor 10 includes a cooler 62, a filter 64, and a condensing solenoid valve SV3 in the return circuit 14b, and cools the circulating water returning from the receiver tank 14 to the compressor body 10 by the cooler 62. Then, after being filtered by the filter 64, it is returned to the compressor body 10 via the condensate solenoid valve SV3.

The water circulation compressor 10 also has a water supply circuit 50 for introducing water supplied from an external water supply source into the compressor body 12 and the receiver tank 14. The water supply circuit 50 is provided with a pure water device 16 and a strainer 17. After the water supplied from an external water supply source is made pure water by the pure water device 16, the water is cleaned (removed impurities) by the strainer 17. Then, water can be supplied into the compressor body 12 through the water supply electromagnetic valve SV1. The water supply electromagnetic valve SV1 is provided as an opening / closing means for the water supply circuit 18, and opens / closes the water supply circuit 50 by controlling the opening / closing of the water supply electromagnetic valve SV1 by means of an electrical signal from the control device 40 to enter the compressor body 12. Water supply can be started or stopped.

Further, the water circulation compressor 10 has a drain circuit 20 connected to the receiver tank 14 for draining the circulating water to the outside of the machine, and the circulating water stored in the receiver tank 14 is generated by the pressure in the receiver tank 14. It is possible to drain through the drain circuit 20. The drainage circuit 20 is provided with a drainage electromagnetic valve SV2 as means for opening and closing the drainage circuit 20. The drainage circuit 20 is opened and closed by controlling the opening and closing of the drainage electromagnetic valve SV2 by an electric signal from the control device 40, and the receiver. The drainage of the circulating water from the tank 14 can be started or stopped.

Further, the water circulation compressor 10 controls the water supply electromagnetic valve SV1 of the water supply circuit 18 and the water discharge electromagnetic valve SV2 of the water discharge circuit 20 to open and close, supply and drain water to the compressor body 12 and the receiver tank 14, and further control the notification device 50. In order to notify or cancel the necessity of purification in a predetermined process, the electrical conductivity sensor 22 as electrical conductivity measuring means for measuring the electrical conductivity of circulating water, and the water level in the receiver tank 14 are detected. Based on the measurement result by the level sensor 32 and the electrical conductivity sensor 22 and the signal from the level sensor 32, the water supply electromagnetic valve SV1 and the drain electromagnetic valve SV2 are controlled to open and close at every predetermined stage, and the notification device 50 needs to be purified. It has the control apparatus 40 which performs the alerting | reporting or cancellation | release of sex. The notification device 50 may be a device that displays on the display panel or the like an image such as “Purification is required. This device is currently being purified”, but may be notified by a lamp, sound, or the like.

The electrical conductivity sensor 22 measures the electrical conductivity C0 of the circulating water, and outputs the measurement result to the control device 40 as an electrical signal. The level sensor 32 can detect the water level in the receiver tank 14 at two positions, ie, a water level upper limit Lh and a water level lower limit Ll. The level sensor 32 detects the water level in the receiver tank 14 and outputs it to the control device 40. The control device 40 controls the opening and closing of the water supply electromagnetic valve SV1 and the drainage electromagnetic valve SV2 according to a preset program or the like based on the measurement result by the electric conductivity sensor 22 and the signal from the level sensor 32, and also notifies the notification device 50. Inform or cancel the necessity of purification.

Hereinafter, with reference to FIG. 2, an outline of a control method for purifying the lubrication water of the water-lubricated compressor according to the present embodiment, informing the necessity of the purification, and for releasing the lubrication will be described. FIG. 2 is a diagram showing a control flow for purifying the lubrication water of the water-lubricated compressor 10 and notifying the necessity of the purification and releasing the same. In the flow shown in FIG. 2, upon receiving a signal related to the measured electrical conductivity value from the electrical conductivity sensor 22, the control device 40 compares the measured electrical conductivity value with the upper limit value of electrical conductivity (purification notification reference value). If the measured value of electrical conductivity is equal to or greater than the upper limit value of electrical conductivity (Yes in S201), the necessity of purification is notified, that is, the display during purification is turned on (S202), and the purification process is performed. Start. That is, the water supply electromagnetic valve 24 is opened and the water supply circuit 18 is opened (S203). When the water supply electromagnetic valve 24 is opened and the water supply circuit 18 is opened, the water level in the separator receiver tank 14 rises due to water supply. This water level is detected by the level sensor 32, and water supply is continued until the water level upper limit Lh is reached (No in S204). When the water level reaches the water level upper limit Lh by the level sensor 32 (Yes in S204), the water supply electromagnetic valve 24 is closed and the drainage electromagnetic valve 26 is opened to start draining (S205). When the drain electromagnetic valve 26 is opened and the drain circuit 20 is opened, the water level in the separator receiver tank 14 is lowered due to drainage. This water level is detected by the level sensor 32, and drainage is continued until the water level lower limit Ll is reached (No in S206). When the water level reaches the water level lower limit L1 by the level sensor 32 (Yes in S206), the drain electromagnetic valve 26 is closed and the water supply electromagnetic valve 24 is opened to start (restart) water supply (S207). The water level in the separator receiver tank 14 rises due to the water supply, the water level is detected by the level sensor 32, and the water supply is continued until the water level upper limit value Lh is reached (No in S208).

When the water level reaches the water level upper limit Lh by the level sensor 32 (Yes in S208), it is determined whether the number of water supply / drainage counted by the water supply / drainage counter 42 has reached a predetermined water supply / drainage number N (cleared). (If not cleared) (No in S209), the process returns to S205 and continues. When the predetermined number N of water supply / drainage is reached (cleared) (Yes in S209), the water supply electromagnetic valve 24 is closed and the water discharge electromagnetic valve 26 is opened to start drainage (S210). When the drainage electromagnetic valve 26 is opened and the drainage circuit 20 is opened, the water level in the separator receiver tank 14 is lowered by drainage, and when this level is detected by the level sensor 32 and reaches the water level upper limit value Lh (water level upper limit value Lh (S211), the drainage electromagnetic valve 26 is closed (S212), the notification of the necessity for purification is released, that is, the display during purification is turned off (S213), and the purification process is terminated. .

Subsequently, the opening / closing control of the water supply electromagnetic valve SV1 and the drainage electromagnetic valve SV2 by the control device 40 and the control for causing the notification device 50 to notify the necessity of purification or to cancel the notification will be described in detail with reference to FIG. FIG. 3 is a time chart showing the operation of each part of the water-lubricated compressor 10 in each process. In a state where the circulating water is not purified (initial state), the water supply electromagnetic valve SV1 and the drainage electromagnetic valve SV2 are in a state where the water supply circuit 18 and the drainage circuit 20 are closed, and water supply and drainage are not performed. The level of the circulating water in the receiver tank 14 is in the middle of the water level upper limit Lh and the water level lower limit Ll. In this state, the control device 40 is controlled by the switches of the level sensor 32 at both the water level upper limit Lh and the water level lower limit Ll. Is not received (T0 in FIG. 3).

From the above initial state, depending on the indoor environment such as a factory where the water circulation compressor 10 is used, the amount of impurities such as metal ions in the circulation water increases as the water circulation compressor 10 sucks outside air and performs compression work. The electrical conductivity of the circulating water may increase. When the control device 40 determines that the electric conductivity C0 measured by the electric conductivity sensor 22 is equal to or higher than the predetermined upper limit value C1, the control device 40 outputs a control signal to the water supply electromagnetic valve SV1 to turn on the water supply electromagnetic valve SV1. Opening (T1 in FIG. 3), the supply of pure water that has passed through the pure water device 16 to the compressor body 10 via the water supply circuit 18 is started. The water supply started in the T1 stage is performed until the water level in the receiver tank 14 reaches the water level upper limit position Lh, and the control device 40 indicates that the level sensor 32 has reached the water level in the receiver tank 14 at the water level upper limit position Lh. The output of the control signal for opening the water supply electromagnetic valve SV1 is maintained until it is detected.

Further, when it is determined that the electrical conductivity C0 measured by the electrical conductivity sensor 22 is equal to or higher than the predetermined upper limit value C1, the control device 40 outputs a purification notification signal to the notification device 50, and the purification is performed to the notification device 50. Inform the need for The control device 40 maintains the output of the purification notification signal to the notification device 50 until it is determined that the predetermined number of times of water supply / drainage has been reached based on the count number of a counter described later.

When the level sensor 32 detects that the water level in the receiver tank 14 is the water level upper limit position Lh, the control device 40 that has received this detection signal closes the water supply electromagnetic valve SV1 of the water supply circuit 18 and supplies water to the compressor body 10. Is stopped and the drain electromagnetic valve SV2 of the drain circuit 20 is opened to start draining the circulating water (T2 in FIG. 3).

The drainage started in the T2 stage is performed until the water level in the receiver tank 14 reaches a predetermined water level lower limit position L1, and the control device 40 causes the level sensor 32 to set the water level in the receiver tank 14 to a predetermined water level lower limit. The output of the control signal for opening the drain electromagnetic valve SV2 is maintained until it is detected that the position is at the position Ll.

When the level sensor 32 detects that the water level in the receiver tank 14 is at the predetermined water level lower limit position L1, the control device 40 closes the drain electromagnetic valve SV2 of the drain circuit 20 and drains water from the receiver tank 14. While stopping, the water supply solenoid valve SV1 of the water supply circuit 18 is opened and water supply to the compressor body 10 is resumed (T3 in FIG. 3).

When the water level in the receiver tank 14 rises due to the water supply started in the above-described T3 stage, and the level sensor 32 detects that the water level in the receiver tank 14 is the water level upper limit position Lh, the control device that has received this detection signal 40 closes the water supply electromagnetic valve SV1 of the water supply circuit 18, stops water supply to the compressor body 10, and opens the water discharge electromagnetic valve SV2 of the drainage circuit 20 to start draining the circulating water (T4 in FIG. 3).

The control device 40 repeatedly executes the above water supply / drainage process until it is determined that the predetermined number of water supply / drainage has been reached based on the count of the counter, and maintains the output of the purification notification signal to the notification device 50. When determining that the predetermined number of times of water supply / drainage has been reached based on the count number of the counter, the control device 40 closes the water supply electromagnetic valve SV1 of the water supply circuit 18 to stop water supply, and ends all the water supply / drainage processes. Further, the output of the purification notification signal to the notification device 50 is stopped, the display during purification is turned OFF, and the purification process is terminated (TN in FIG. 3).

According to the present invention, it is possible to purify the circulating water regardless of the environment in which the compressor is used by notifying the necessity of the purification of the lubricating water when the electrical conductivity exceeds a predetermined purification notification reference value. Can be notified in a timely manner. Further, by purifying the lubricating water when the electrical conductivity exceeds a predetermined (purification notification) reference value, it becomes possible to purify the circulating water in a timely manner regardless of the environment in which the compressor is used. . Furthermore, when the electrical conductivity becomes equal to or higher than a predetermined (purification notification) reference value, it is possible to prevent failure due to the scale by purifying the lubricating water. In addition, copper-based materials are commonly used in equipment that uses water because of their corrosion resistance and low price, but they are lubricated so that copper-based materials are not exposed to high-purity water for a long time. The generation of patina can be suppressed by controlling the purification of water and preventing the purity from becoming too high.

In the above description, the control device 40 repeatedly executes the above water supply / drainage process until it is determined by the count number of the water supply / drainage counter 42 that the predetermined number of water supply / drainage has been reached, and notifies the notification device 50 of the necessity for purification. As described above, when the control device 40 includes a timer (not shown) for measuring the time from the start of water supply / drainage, instead of the water supply / drainage counter 42, the notification device 50 notifies the necessity of purification. The control device 40 may repeat the water supply / drainage until the predetermined number of times of water supply / drainage determined by the time measured by a timer (not shown) is reached, and may cause the notification device 50 to notify the necessity of purification.

  In the embodiment described above, the present invention is applied to a water-lubricated compressor that uses a pure water device as a purified water device (a device that purifies water). However, the present invention is not limited to using a pure water device. Of course. For example, it can be widely applied to those using an RO water device instead of a pure water device.

10 water-lubricated compressor, 12 compressor body, 14 receiver tank,
16 Pure water equipment, 18 Water supply circuit, 20 Drain circuit, 22 Electrical conductivity sensor,
SV1 water supply solenoid valve, SV2 drainage solenoid valve, 40 control device, 50 alarm device

Claims (4)

A compressor body that compresses the intake air together with the circulating water and a discharge port of the compressor body. The compressed air and the circulating water discharged from the compressor body are introduced to separate the compressed air and the circulating water. In a water circulation type compressor having a receiver tank for storing and circulating the circulating water between the compressor main body and the receiver tank, a water supply circuit having a purified water device and communicating between an external water supply source, the compressor main body and the receiver tank And a drain circuit connected to the receiver tank, an electrical conductivity measuring means for measuring the electrical conductivity of the circulating water, an opening / closing means for the water supply circuit, and an opening / closing means for the drain circuit, respectively. The electrical conductivity measured by the conductivity measuring means is compared with a preset purification notification reference value, and the measured electrical conductivity is equal to or greater than the purification notification reference value. Water circulation compressor, wherein the notifying the need for purification to. Further, the level sensor for controlling the water level in the receiver tank, the water supply circuit opening / closing means and the drain circuit opening / closing means are operated to supply water until the water level in the receiver tank reaches the upper limit, until the lower limit is reached. A control means for repeating drainage and a counter for counting the number of times of water supply and drainage, and when notifying the necessity of purification, the control means, until the count number of water supply and drainage by the counter reaches a predetermined number of times of water supply and drainage, A water circulation compressor characterized by repeating the water supply and drainage. Further, the level sensor for controlling the water level in the receiver tank, the water supply circuit opening / closing means and the drain circuit opening / closing means are operated to supply water until the water level in the receiver tank reaches the upper limit, until the lower limit is reached. A control means for repeating drainage, and a timer for measuring the time from when the control means started the water supply / drainage, and when notifying the necessity for purification, the control means is determined by the time measured by the timer. The water circulation compressor is characterized in that the water supply / drainage is repeated until the predetermined number of water supply / drainage is reached. After the notification of the necessity for purification, the control means cancels the notification of the necessity for purification when the water supply / drainage is repeated until the predetermined number of times of water supply / drainage is reached.

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