JP6937008B2 - Pressure drop monitoring device - Google Patents

Description

The present invention relates to a pressure drop monitoring device that can notify when the pressure of compressed air in a compressed air transport pipe laid in a factory drops below the normal pressure.

A conventional technique of a pressure drop monitoring device for notifying a pressure drop of compressed air in a pipe is described as a pipe inspection device in Patent Document 1, for example. In this conventional technique, in order to inspect a leak from a joint of a water supply pipe, the pipe is filled with water, pressurized to a predetermined pressure, sealed, and then the pressure inside the pipe is measured to cause pressure fluctuation. If it is large, it is judged that there is water leakage. In this method, a pipe inspection device has been proposed to simplify complicated work such as bleeding air when filling pipes with water and bleeding water after inspection, and to easily inspect pipe leaks. ..

The configuration of the piping inspector includes a compressor that fills a predetermined pressure pipe with air of a predetermined pressure, a pressure gauge that measures the pressure of the air in the pipe, and a pressure measurement value that records the pressure measured by the pressure gauge. It has a memory. For leaks in pipes, the pipes are filled with air by a compressor, and the pressure of the air in the pipes is measured by a pressure gauge. When the value measured by the pressure gauge reaches a value preset in the microcomputer, the compressor is stopped and the pipe is closed, and the rate of change in which the measured value of the pressure gauge fluctuates over time drops significantly from the judgment reference value. , Judges that there is a leak and issues an alarm.

Japanese Unexamined Patent Publication No. 5-79943

In the above-mentioned conventional technique, when the pressure drop such as the leakage of the pipe for transporting water is slow, the presence or absence of the leakage of the pipe can be detected, but compressed air of a plurality of tire air filling machines, a pneumatic cylinder, etc. It cannot be used to continuously monitor the pressure drop in the compressed air transport piping to which various compressed air consuming devices operated by are connected.

The timing of each compressed air consuming device connected to the pipe operates irregularly, and multiple compressed air consuming devices may operate at the same time, so the amount of compressed air consumed differs for each compressed air consuming device. , It is difficult to judge by the degree of pressure change with the passage of time, that is, the rate of change of the amount of pressure change.

Further, in the above-mentioned prior art, each compressed air consuming device is installed in a different place in the factory, and the pressure of the compressed air in the pipe is set to a desired place according to each compressed air consuming device installed in the factory. When the pressure in the pipe drops below the reference value, it is not possible to notify the operator and urge the operator to adjust the operating status of the compressed air consuming equipment installed in the vicinity.

An object of the present invention is to provide a pressure drop monitoring device capable of easily monitoring the pressure of compressed air in a pipe at an arbitrary location.

The present invention is a pressure drop monitoring device that is connected to a pipe that transports compressed air and generates an alarm when the pressure of the air in the pipe drops below a predetermined reference pressure.
A case body formed in a hollow rectangular parallelepiped shape by the first to sixth walls made of a quadrangular plate, and
A pressure measuring unit having a pressure display unit that displays a measured pressure and a predetermined reference pressure, and a pressure measuring unit provided on the first wall portion with the pressure display unit facing the outside from the first wall portion.
A connection portion provided on the second wall portion, having a connection plug that can be connected to the pipe by a predetermined pipe body, and a pipe connection portion connected to the pressure gauge.
A light emitting unit provided on the third wall portion that emits light when the measured pressure is equal to or lower than the predetermined reference pressure.
A sound emitting portion provided on the fourth wall portion and generating an alarm sound when the measured pressure is equal to or lower than the predetermined reference pressure is included.
The light emitting unit
With the board
A plurality of light emitting elements arranged at equal intervals on the virtual circumference on the substrate,
It has a reflecting member having an inverted truncated cone-shaped reflecting surface arranged on the central axis of the virtual circle and facing the plurality of light emitting elements.
The light emitting unit includes a light emitting element for emitting red, a light emitting element which emits light in yellow, when the measured pressure falls below the reference pressure, Rutotomoni turns on the light emitting element of the red, the sound An alarm sound is generated in the unit, and when the measured pressure does not exceed the reference pressure even after a predetermined time has elapsed from the time when the measured pressure becomes equal to or lower than the reference pressure, the light emission of the red light emitting element is stopped. is, Rutotomoni turns on the light emitting element of the yellow, to stop sound emission operation of the sound output part, if exceeded then the measurement pressure is the reference pressure, turns off the light emission of the light emitting element of the yellow, measuring It does not exceed the reference pressure is the pressure, turn off the power, the pressure drop monitoring device, characterized in that to terminate all operations.

The present invention is further characterized by further including a magnetic adsorbent provided on the fifth wall portion and having an adsorbent piece made of a ferromagnetic material.

Further, in the present invention, the case body is made of an aluminum alloy.
The outer surface of the case body is covered with a hard alumite layer.

According to the present invention, a pressure measuring unit is provided on the first wall portion of the case body, a pipe connecting portion is provided on the second wall portion, a light emitting portion is provided on the third wall portion, and the light emitting portion is provided on the fourth wall portion. Since the sound unit is provided, the pressure drop monitoring device can be easily installed at a desired position and direction in which the operator can easily check the light generated from the light emitting unit or the sound generated from the sound emitting unit in a factory or the like. It is possible to have a high degree of freedom in installation in the mounting position and mounting direction, and it is possible to easily install multiple pressure drop monitoring devices at any location so that the pressure of the air in the piping drops below the reference pressure. , It is possible to reliably notify the operator.

Further, according to the present invention, since the magnetic adsorbent is provided on the fifth wall portion, an object made of a ferromagnetic material capable of magnetic adsorption, such as an existing building facility such as a steel frame in a factory or an existing structure, can be used. By using this, the pressure drop monitoring device can be easily installed, and the mountability can be improved.

Further, according to the present invention, since the outer surface of the case body is covered with a hard alumite layer, high resistance to the action of external force due to corrosion and contact with equipment can be obtained.

It is a front view which shows the pressure drop monitoring apparatus 1 of one Embodiment of this invention. It is a right side view of the pressure drop monitoring device 1. It is a left side view of the pressure drop monitoring device 1. It is a rear view of the pressure drop monitoring device 1. It is a top view of the pressure drop monitoring device 1. It is a bottom view of the pressure drop monitoring device 1. It is an enlarged cross-sectional view of a magnetic adsorbent. It is a simplified plan view of the light emitting unit 11. It is a simplified front view which shows the internal structure of a light emitting part 11. It is a system diagram which shows the electrical structure of the pressure drop monitoring apparatus 1. It is a timing chart for demonstrating the operation of a relay 31. It is a flowchart for demonstrating the operation of the pressure drop monitoring apparatus 1. It is a graph which shows the pressure determination function of a pressure measuring unit 6. It is a front view which shows the pressure drop monitoring apparatus 1A of another embodiment of this invention. It is a right side view of the pressure drop monitoring device 1A. It is a left side view of the pressure drop monitoring device 1A. It is a rear view of the pressure drop monitoring device 1A. It is a top view of the pressure drop monitoring device 1A. It is a bottom view of the pressure drop monitoring device 1A. FIG. 21 is a system diagram showing an electrical configuration of the pressure drop monitoring device 1A. It is a figure for demonstrating the on-delay operation by the on-delay timer 31A1 and the off-delay operation by an off-delay timer 31A2. It is a timing chart for demonstrating the on-delay operation of the on-delay timer 31A1. It is a timing chart for demonstrating the off-delay operation of the off-delay timer 31A2.

FIG. 1 is a front view showing a pressure drop monitoring device 1 according to an embodiment of the present invention, FIG. 2 is a right side view of the pressure drop monitoring device 1, and FIG. 3 is a left side view of the pressure drop monitoring device 1. Is. FIG. 4 is a rear view of the pressure drop monitoring device 1, FIG. 5 is a plan view of the pressure drop monitoring device 1, and FIG. 6 is a bottom view of the pressure drop monitoring device 1.

The pressure drop monitoring device 1 of the present embodiment is connected to a pipe 2 for transporting compressed air in the factory, and when the pressure of the air in the pipe 2 is equal to or less than a predetermined reference pressure P0, a pressure drop monitoring that generates an alarm is performed. As a device, it is used by installing it on the wall or pillar of a factory.

The pressure drop monitoring device 1 displays the case body 4 formed in a hollow rectangular shape by the first to sixth wall portions 3a to 3f made of a square plate-like body, and the measured pressure P of the measured air, and also serves as a reference. It has a pressure display unit 5 that can display and set the pressure P0, and has a pressure measurement unit 6 and a second wall unit 6 provided on the first wall unit 3a with the pressure display unit 5 facing the outside from the first wall unit 3a. The pipe connection portion 7 provided in 3b has a connection plug 9 that can be connected to the pipe 2 by a pipe joint such as a socket by a predetermined pipe body 8 such as a pressure hose, and is connected to the pressure measurement unit 6. It is provided in the pipe connection portion 7 and the third wall portion 3c and emits light when the measurement pressure P is equal to or less than the reference pressure P0. The light emitting portion 11 and the fourth wall portion 3d are provided and the measurement pressure P is the reference pressure P0. When the following, the sound emitting unit 12 for generating an alarm sound is provided. In the case body 4, in the present embodiment, the first wall portion 3a is the front wall, the second wall portion 3b is the left side wall, the third wall portion 3c is the bottom wall, the fourth wall portion 3d is the right wall portion, and the fifth wall portion. The 3e is a back wall, and the sixth wall 3f is a ceiling wall.

The pressure measuring unit 6 is a so-called pressure gauge with contacts, and is configured so that an arbitrary pressure can be set as a set pressure by rotating the setting needle 6a by the operation shaft 6b. The specific pattern of the alarm sound generated by the sound emitting unit 12 is, for example, an intermittent sound such as "pipipi ..." in which a sound having a frequency of about 4000 Hz and a sound pressure of about 90 dB (at 1 m) sounds intermittently. Such a sound emitting unit 12 may be realized by, for example, a piezoelectric buzzer including a piezoelectric element.

The case body 4 is made of an aluminum alloy, and a coating layer is formed on the outer surface thereof by hard alumite, and has high impact resistance and corrosion resistance. The coating film has a Vickers hardness Hv of about 390, for example, when a load of 200 G is applied for 10 seconds at a film thickness of 50 μm. Such a coating layer can be formed by hard alumite plating.

FIG. 7 is an enlarged cross-sectional view of the magnetic adsorbent 13. The fifth wall portion 3e is provided with a plurality of magnetic adsorbents 13 (4 in the present embodiment) having adsorbent pieces 15 made of ferromagnets in the vicinity of the four corners. The suction piece 15 is made of, for example, a neodymium magnet having a diameter of 15 to 30 mm and a thickness of 5 to 7 mm, is magnetized in the axial direction, and has an suction force of about 9 kgf.

Since a plurality of such magnetic adsorbents 13 are provided on the fifth wall portion 3e, an object made of a ferromagnetic material capable of magnetic adsorption, such as an existing building facility such as a steel frame in a factory or an existing structure, can be formed. By using this, the pressure drop monitoring device 1 can be easily installed, the degree of freedom with respect to the mounting position is high, and the mountability is excellent.

FIG. 8 is a simplified plan view of the light emitting unit 11, and FIG. 9 is a simplified front view showing the internal structure of the light emitting unit 11. Note that FIG. 9 shows a view of the light emitting unit 11 of FIG. 8 as viewed from below. The light emitting portions 11 are arranged on the inner peripheral side of the substrate 16 on the inner peripheral side at equal angular intervals in the circumferential direction, and on the outer peripheral side of the substrate 16 at equal angular intervals in the circumferential direction. It has 12 light emitting elements 18 and a reflecting member 19 having a truncated cone-shaped reflecting surface 19a facing each of the light emitting elements 17 and 18 on the central axis. Each of the light emitting elements 17 and 18 is realized by a light emitting diode (abbreviated as LED; Light Emitting Diode).

FIG. 10 is a system diagram showing the electrical configuration of the pressure drop monitoring device 1. When the power switch SW is turned on to the light emitting unit 11 and the sound emitting unit 12, the power from the power supply 30 is supplied or cut off to the relay 31 by turning on / off the contacts a to h built in the pressure measuring unit 6. NS. The pressure measuring unit 6 has a switching function, and when the measured pressure P is equal to or less than the reference pressure P0, an exciting current for exciting the coil 32 is generated, and when the measured pressure P exceeds the reference pressure P0, an exciting current is generated. It is configured to maintain a non-excited state. As the power supply 30, for example, a commercial AC power supply having an AC voltage of about 100 V is used.

FIG. 11 is a timing chart for explaining the operation of the relay 31. The relay 31 is realized by an on-delay timer having first to eighth contacts a to h. When the measured pressure P of the pressure measuring unit 6 becomes equal to or less than the reference pressure P0 at time t1 with the power switch SW turned on, the contact a and the contact b become conductive as shown in FIG. 11 (1), and the contact is contacted. The capacitor 33 connected in series between a and the contact b is charged, and as shown in FIG. 11 (2), the common contact c and one individual contact e are connected. The state in which the common contact c and the individual contact e are connected continues until time t2, the light emitting unit 11 emits red rotational light from time t1 to time t2, and at time t2, the charged capacitor 33 is discharged. , An exciting current flows through the coil 32, and the common contact c and the other individual contact d are connected. As a result, the red rotation light emitting operation of the light emitting unit 11 is stopped, and the yellow light emitting operation of the light emitting unit 11 is started as shown in FIG. 11 (3). At the same time, the common contact f and one individual contact h are connected, and the sound emitting unit 12 emits the above alarm sound from the time t1 to the time t2. At time t2, when the common contact f and the other individual contact g are switched to the connected state, the sound of the sound unit 12 is stopped. Such light emitting / discharging operations at times t1 to t3 are continued until the measured pressure P of the pressure measuring unit 6 exceeds the reference pressure P0.

Such an on-delay timer is set so that the timer circuits of the contacts a and b are electrically connected, the relay operates after the timer setting time elapses (in this case, time t2), and the two contacts are switched at the same time. After switching once, the connection state between contacts c and d and between contacts f and g does not return until the continuity of contacts a and b is cut off (time t3). The NC contact (normally closed) in FIG. 11 (2). ), The NO contact (normally open) shown in FIG. 11 (3). The operation of the pressure drop monitoring device 1 is as follows: red rotation light emission + alarm sound at time t1 in FIG. 11, red rotation lighting stop + yellow light emission + alarm sound stop at time t2, and all stop at time t3.

The light emitting unit 11 looks like a rotating light and improves visibility by causing two opposing light emitting elements of the light emitting element 18 to emit red light and the light emitting elements are sequentially switched clockwise. Further, all the light emitting elements 17 are lit in yellow.

FIG. 12 is a flowchart for explaining the operation of the pressure drop monitoring device 1, and FIG. 13 is a graph showing the pressure determination function of the pressure measuring unit 6. When the power supply 30 of the pressure drop monitoring device 1 is turned on by the power switch SW in step S1, the measurement of the pressure of the air in the pipe 2 is started by the pressure measuring unit 6 in step S2, and the pressure measuring unit moves to step S3. In No. 6, the built-in contact switch is switched on / off depending on whether or not the measured pressure P is equal to or less than the reference pressure P0.

At time t1, when the measured pressure P is equal to or lower than the reference pressure P0, the pressure measuring unit 6 turns on the contact built in the pressure measuring unit 6, and in step S4, the light emitting unit 11 rotates and emits light in red and emits light. The sound unit 12 generates an alarm sound to notify the operator that the pressure has dropped. The relay 31 executes an on-delay timer operation of switching the NC contact and the NO contact to the on / off state after maintaining the NC contact and the NO contact in the off / on state for a certain period of time as described above.

In step S5, when the measured pressure P rises above the reference pressure P0 within a predetermined time, for example, 30 seconds, the relay 31 proceeds to step S9 and stops the light emitting operation of the light emitting unit 11 and the sound emitting operation of the sound emitting unit 12. Let me. If the measured pressure P does not exceed the reference pressure P0 even after a lapse of a certain period of time, the NC contact and the NO contact of the relay 31 are switched, and in step S6, all the yellow light emitting elements 17 are turned on in the light emitting unit 11. At the same time, after stopping the sound emitting operation of the sound emitting unit 12, if the measured pressure P exceeds the reference pressure P0 in step S7, all the light emitting units 11 are turned off in step S10, and the measured pressure P is the reference pressure P0. If the pressure is not exceeded, the power switch SW is turned off in step S8 to end all operations.

As described above, according to the present embodiment, the pressure measuring unit 6 is provided on the first wall portion 3a of the case body, the pipe connecting portion 7 is provided on the second wall portion 3b, and the light emitting portion is provided on the third wall portion 3c. Since 11 is provided and the sound emitting unit 12 is provided on the fourth wall portion 3d, it is hoped that the operator can easily check the light generated from the light emitting unit 11 or the sound generated from the sound emitting unit 12 in a factory or the like. The pressure drop monitoring device 1 can be easily installed at the desired position and orientation, and there is a high degree of freedom in installation at the mounting position and mounting direction, and a plurality of pressure drop monitoring devices 1 can be easily installed at any location. Therefore, it is possible to reliably notify the operator that the pressure of the air in the pipe 2 has dropped to the reference pressure P0 or less.

Further, since the magnetic adsorbent 13 is provided on the fifth wall portion 3e, an object made of a ferromagnetic material capable of magnetic adsorption, such as an existing building facility such as a steel frame in a factory or an existing structure, is used. , The pressure drop monitoring device 1 can be easily installed, and the mountability can be improved.

Further, since the outer surface of the base material of the case body 4 is covered with a hard alumite layer, high resistance to the action of external force due to corrosion and contact with equipment can be obtained.

14 is a front view showing the pressure drop monitoring device 1A of another embodiment of the present invention, FIG. 15 is a right side view of the pressure drop monitoring device 1A, and FIG. 16 is a left side view of the pressure drop monitoring device 1A. It is a figure. FIG. 17 is a rear view of the pressure drop monitoring device 1A, FIG. 18 is a plan view of the pressure drop monitoring device 1A, and FIG. 19 is a bottom view of the pressure drop monitoring device 1A. The same reference numerals are given to the parts corresponding to the above-described embodiments.

The pressure drop monitoring device 1A of the present embodiment is connected to the pipe 2 for transporting compressed air in the factory and is connected to the pipe 2 in the same manner as the pressure drop monitoring device 1 of the above-described embodiment shown in FIGS. When the pressure of the air in the air is equal to or less than a predetermined reference pressure P0, it is used by installing it on a wall or a pillar of a factory as a pressure drop monitoring device for generating an alarm. In the above-described embodiment, the first wall portion 3a is the front wall, the second wall portion 3b is the left side wall, the third wall portion 3c is the bottom wall, the fourth wall portion 3d is the right side wall, and the fifth wall portion 3e is the back wall. The case main body 4 is configured with the sixth wall portion 3f as the ceiling wall, but in another embodiment of the present invention, the first wall portion 3a is the front wall, the second wall portion 3b is the back wall, and the third wall portion 3b. The case body 4 is configured with the wall portion 3c as the ceiling wall, the fourth wall portion 3d as the left side wall, the fifth wall portion 3e as the right side wall, and the sixth wall portion 3f as the bottom wall. Similar to the above-described embodiment, such a case body 4 also has a coating layer formed on the outer surface by hard alumite plating and has high resistance to external force.

Such a pressure drop monitoring device 1A displays the case body 4 formed in a hollow rectangular shape by the first to sixth wall portions 3a to 3f made of a square plate-like body, and the measured pressure P of the measured air. A pressure measuring unit 6 provided on the first wall portion 3a with the pressure display unit 5 facing the outside from the first wall portion 3a and a pressure measuring unit 6 having a pressure display unit 5 capable of displaying and setting a reference pressure P0. 2 A pipe connection portion 7 provided on the wall portion 3b, which has a connection plug 9 that can be connected to the pipe 2 by a pipe joint such as a socket by a predetermined pipe body 8 such as a pressure hose, and the pressure measurement unit 6 has a connection plug 9. The connected pipe connection portion 7 and the third wall portion 3c are provided, and when the measurement pressure P is equal to or less than the reference pressure P0, the light emitting portion 11 that emits light and the fourth wall portion 3d are provided with the measurement pressure P. A sound emitting unit 12 that generates an alarm sound when the reference pressure is P0 or less is provided.

As a specific generation pattern of the alarm sound by the sound emitting unit 12, for example, an intermittent sound such as "pipipi ..." in which a sound having a frequency of about 4000 Hz and a sound pressure of about 90 dB (at 1 m) sounds intermittently is set. However, the optimum frequency may be set according to the urgency and the installation environment, or the sound in which a plurality of frequencies are appropriately combined may be set.

The case body 4 is made of an aluminum alloy, and a coating layer is formed on the outer surface thereof by hard alumite as in the above-described embodiment, and has high impact resistance and corrosion resistance.

FIG. 20 is a wiring system diagram showing an electrical configuration of the pressure drop monitoring device 1A, and FIG. 21 is a diagram for explaining an on-delay operation by the on-delay timer 31A1 and an off-delay operation by the off-decay timer 31A2. The pressure drop monitoring device 1A includes an on-delay timer 31A1 and an off-delay timer 31A2. The on-delay timer 31A1 has a plurality of contacts a to e, and a self-holding circuit 40 including a coil 32 and a capacitor 33 connected in series between the contacts a and b. The contact a is connected to the pressure measuring unit 6, the contact b is connected to the power supply 30 and the sound emitting unit 12, and the contact e is connected to the sound emitting unit 12.

The off-delay timer 31A2 has a plurality of contacts S1 to S11. The contact S1 and the contacts S3 and S4 are switched in a conduction / cutoff state by the contact changeover switch SW1 so that any of the contacts S3 and S4 as individual contacts is connected to the contact S1 as a common contact. The contact S2 is connected to the pressure measuring unit 6 and the contact S1. Further, the contact S6 is connected to the contact a of the on-delay timer 31A1, and the contacts S7 and S10 are connected to the contact b and the light emitting unit 11.

When the power switch SW is turned on to the light emitting unit 11 and the sound emitting unit 12, the power from the power supply 30 is supplied by the on-delay timer 31A1 and the off-delay timer 31A2 having contacts a to e built in the pressure measuring unit 6. , Power is supplied or cut off. The on-delay timer 31A1 and the off-delay timer 31A2 constitute a timer circuit 31A.

The pressure measuring unit 6 has a switching function, and when the measured pressure P is equal to or less than the reference pressure P0, an exciting current for exciting the coil 32 is generated, and when the measured pressure P exceeds the reference pressure P0, an exciting current is generated. It is configured to maintain a non-excited state.

FIG. 22 is a timing chart for explaining the on-delay operation of the on-delay timer 31A1, and FIG. 23 is a timing chart for explaining the off-delay operation of the off-delay timer 31A2. When the measured pressure P exceeds the reference pressure P0 within the set time, the power switch SW is turned on as shown in FIGS. 22 (1) and 23 (1), and FIGS. 22 (4) and 23 (4) are turned on. As shown in the above, the measured pressure P of the pressure measuring unit 6 becomes the reference pressure P0 at time t1 with the power supply voltage applied to the contacts a and b of the on-delay timer circuit 31A and the contacts S2 and S10 of the off-delay timer 31A2. When the following occurs, the switch SW1 conducts the contact S1 and the contact S3 of the off-delay timer circuit 31A2, the contact S3 and the contact c of the on-delay timer 31A1 conduct, and further, the contact c and the contact e of the on-delay timer 31A1. Is connected, and an alarm sound is emitted from the sound emitting unit 12. At the same time, electric power is supplied from the contact S3 to the light emitting unit 11, and the light emitting unit 11 rotates and emits light in red.

When there is no input to the contacts S6 and S7 at time t2, an arbitrary set time, for example, 1 minute is clocked from this time t2, and at time t3 when 1 minute elapses, the contacts S1 and S4 of the off delay timer 31A2 are set. It is connected by the switch SW1, which stops the light emitting operation of the light emitting unit 11 and the sound emitting operation of the sound emitting unit 12.

On the other hand, when the measured pressure P does not exceed the reference pressure P0 within the set time, the contacts c and d of the off delay timer 31A1 become conductive at time t4 as shown in FIGS. 23 (2) to 23 (5). Then, only the sound emitting operation by the sound emitting unit 12 is stopped. Such time t4 is related only to time t1 when the measured pressure P becomes equal to or less than the reference pressure P0, and is set independently of time t3. For example, time t4 is set 5 minutes after time t1.

As described above, according to the present embodiment, the pressure measuring unit 6 is provided on the first wall portion 3a of the case body 4, the pipe connecting portion 7 is provided on the second wall portion 3b, and the third wall portion 3c emits light. Since the section 11 is provided and the sound emitting section 12 is provided on the fourth wall section 3d, it is easy for the operator to check the light generated from the light emitting section 11 or the sound generated from the sound emitting section 12 in a factory or the like. The pressure drop monitoring device 1 can be easily installed at a desired position and orientation, and there is a high degree of freedom in installation at the mounting position and mounting direction, and a plurality of pressure drop monitoring devices 1A can be easily installed at any location. When installed, it is possible to reliably notify the operator that the pressure of the air in the pipe 2 has dropped to the reference pressure P0 or less.

Further, since the magnetic adsorbent 13 is provided on the fifth wall portion 3e, an object made of a ferromagnetic material capable of magnetic adsorption, such as an existing building facility such as a steel frame in a factory or an existing structure, is used. , The pressure drop monitoring device 1 can be easily installed, and the mountability can be improved.

Further, since the outer surface of the case body 4A is covered with a hard alumite layer, high resistance to the action of external force due to corrosion and contact with equipment can be obtained.

1,1A Pressure drop monitoring device 2 Piping 3a to 3f 1st to 6th wall 4 Case body 5 Pressure display 6 Pressure measuring 7 Piping connection 8 Pipe 9 Connection plug 11 Light emitting part 12 Sound emitting part 30 Power supply 31 Timer circuit 31A1 On-delay timer 31A2 Off-delay timer a to e; S1 to S11 contacts P Measured pressure P0 Reference pressure

Claims (3)

A pressure drop monitoring device that is connected to a pipe that transports compressed air and generates an alarm when the pressure of the air inside the pipe drops below a predetermined reference pressure.
A case body formed in a hollow rectangular parallelepiped shape by the first to sixth walls made of a quadrangular plate, and
A pressure measuring unit having a pressure display unit that displays a measured pressure and a predetermined reference pressure, and a pressure measuring unit provided on the first wall portion with the pressure display unit facing the outside from the first wall portion.
A connection portion provided on the second wall portion, having a connection plug that can be connected to the pipe by a predetermined pipe body, and a pipe connection portion connected to the pressure gauge.
A light emitting unit provided on the third wall portion that emits light when the measured pressure is equal to or lower than the predetermined reference pressure.
A sound emitting portion provided on the fourth wall portion and generating an alarm sound when the measured pressure is equal to or lower than the predetermined reference pressure is included.
The light emitting unit
With the board
A plurality of light emitting elements arranged at equal intervals on the virtual circumference on the substrate,
It has a reflecting member having an inverted truncated cone-shaped reflecting surface arranged on the central axis of the virtual circle and facing the plurality of light emitting elements.
The light emitting unit includes a light emitting element that emits light in red and a light emitting element that emits light in yellow. When the measured pressure becomes equal to or lower than the reference pressure, the red light emitting element is turned on and the sound emitting unit is turned on. When the measured pressure does not exceed the reference pressure even after a predetermined time has elapsed from the time when the measured pressure becomes equal to or lower than the reference pressure, the light emission of the red light emitting element is stopped. , The yellow light emitting element is turned on, the sound emitting operation of the sound emitting unit is stopped, and if the measured pressure subsequently exceeds the reference pressure, the light emission of the yellow light emitting element is turned off and the measured pressure is increased. A pressure drop monitoring device characterized in that the power is turned off to end all operations if the reference pressure is not exceeded . The pressure drop monitoring device according to claim 1, further comprising a magnetic adsorbent provided on the fifth wall portion and having an adsorbent piece made of a ferromagnetic material. The pressure drop monitoring device according to claim 1 or 2, wherein the case body is made of an aluminum alloy, and the outer surface of the case body is coated with a hard alumite layer.

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