JPH0124643Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas pressure control device that can automatically and arbitrarily control gas pressure during gas supply.

Conventionally, in gas pressure control for supplied gas, centralized monitoring control using a telemeter or individual control using a clock mechanism and a cam mechanism is used.
The former is a so-called electronic gas pressure control device that receives a valve opening control signal from a telemeter and sets the pressure control valve to a given valve opening, while the latter is a valve opening control signal attached to a cam. This is a so-called mechanical gas pressure control device that sets the opening degree of the pressure control valve based on a degree curve. Therefore, in the case of an electronic gas pressure control device, the opening degree cannot be controlled until it is connected to a telemeter. On the other hand, it is difficult to perform local control without connecting a telemeter, and the device may become expensive.For mechanical gas pressure control devices, it is preferable to use the accuracy of a clock mechanism or the valve opening/closing accuracy of a cam mechanism. In addition, when changing the valve opening degree curve, it is necessary to replace the cam.

Also, recently, data corresponding to the valve opening to be set is stored in a storage device, the stored data is read from the storage device at predetermined times, and the valve opening is controlled using this data as a reference value. Such a gas pressure control device has also been proposed, but in the case of such a device, if the gas pressure to be set at the gas pressure control station where this device is installed varies slightly depending on various factors, Alternatively, in cases where there are variations in the operating accuracy of the control mechanism, the optimum gas pressure cannot be set unless the data stored in the storage device is updated.

This invention was made in view of the above points,
The aim is to provide a gas pressure control device with which local control can be carried out very accurately and optimally.

According to the present invention, the object is to provide a gas pressure control device having a pressure control valve 3, a mechanical operating section 2, and an electric circuit section 51, wherein the mechanical operating section 2 has a shaft means 2r that can move forward and backward.
, a motor 2a for advancing and retracting the shaft means 2r, and a pressure control valve control means 5 connected to the shaft means 2r.
2, the electric circuit section 51 has a detector 54 that detects the advance and retreat of the shaft means 2r and outputs pressure data;
A clock circuit 13 that outputs a time signal, a main memory 12 that stores set pressure data for each time zone,
a data readout circuit 11 that reads set pressure data from the main storage device 12 in response to a time signal supplied from the clock circuit 13; and a secondary storage device 18 that stores corrected pressure data for each time period with respect to the set pressure data; While writing the corrected pressure data in the secondary storage device 18, the clock circuit 1
a read/write circuit 17 that reads the corrected pressure data from the secondary storage device 18 in response to a time signal supplied from the sub-storage device 18; When the read/write circuit 17 reads the secondary storage device 1,
The corrected pressure data updated from the corrected pressure data read from 8 and the increased/decreased pressure data at the time corresponding to this setting is supplied to the secondary storage device 18 via the correction circuit 8 and the read/write circuit 17. an adding/subtracting device 10, the correction circuit 8 which corrects the setting pressure data from the reading circuit 11 using the updated corrected pressure data from the adding/subtracting device 10, and outputs the corrected setting pressure data; A comparison calculation circuit 7 outputs a difference signal based on the corrected setting pressure data output from the correction circuit 8 and pressure data from the detector 54, and a comparison calculation circuit 7 outputs a difference signal based on the corrected set pressure data output from the correction circuit 8 and the pressure data from the detector 54. The pressure control valve control means 52 has a drive circuit 9 for operating the partition means 2.
d, 2e, 2h and valve devices 2i, 2y, 2p, 2u
and a communication port 31, and a pressure control valve operating means 53, and each of the partition wall means 2d, 2e, and 2h receives a spring force determined by the movement of the shaft means 2r on one side, and The other surface facing the surface receives the gas pressure on the output pressure side of the pressure control valve 3, is deformable according to the difference between the received spring force and the gas pressure, and moves along with this deformation. It includes a moving means 2h, the valve devices 2i, 2y, 2p, 2u are connected to the partition means 2d, 2e, 2h, and the pressure control valve is moved by moving the moving means 2h in the first direction. By moving the input pressure side valve means 2u and the moving means 2h in a second direction opposite to the first direction, the output pressure side and the communication port 31 are brought into communication with each other. and an output pressure side valve means 2i for communication, and the pressure control valve operating means 52 communicates with the communication port 31.
This is achieved by a gas pressure control device characterized in that the valve opening degree of the pressure control valve 3 provided midway through the pipes 4 and 5 is adjusted in accordance with the gas pressure received through the pipes 4 and 5.

Next, a preferred specific example of the present invention will be explained based on the drawings.

In FIGS. 1 to 3, a gas pressure control device 20 includes a pressure control valve 3, a mechanical operating section 2 that mechanically controls the pressure control valve 3, and an electric circuit that electrically controls the mechanical operating section 2. It consists of a section 51. Potentiometer 1 provided in electric circuit section 51
is connected to a shaft 2r as a shaft means provided in the mechanical actuator 2, and outputs data corresponding to the valve opening degree of the pressure control valve 3 set by the mechanical actuator 2 as a pressure data signal. The mechanical actuator 2 has a reversible electric motor 2a, a pilot valve 2b, and a valve control container 2c, and the electric motor 2a serves as a motor.
The operation of the pressure control valve 3 opens and closes the pressure control valve 3. In the mechanical operation part 2, 2d and 2e are diaphragms provided to define the inside of the valve 2b into two chambers 2f and 2g.
e are connected by a connecting member 2h as a moving means, and the output pressure side gas passing through the pressure control valve 3 is supplied to the chamber 2g.
f, when the valve 2u as the input pressure side valve means connected to the valve 2i as the output pressure side valve means is released from contact with the pipe 2y and the passage 2j is opened, the pressure is controlled via the passage 2j. Gas on the input pressure side before being input to valve 3 is supplied to chamber 2.
f is the container 2 defined by the diaphragm 2k
It is connected to chamber 2l in c, and is connected to chamber 2f and chamber 2g.
When the valve 2i opens the through hole 2m formed in the connecting member 2h, the valve 2i is communicated with the through hole 2m through the through hole 2m.

2n, 2p, and 2q are coil springs, respectively, and the spring 2n is provided between the shaft 2r and the connecting member 2h, and the extension force of the spring 2n pushes the connecting member 2h against the gas pressure in the chamber 2g. It is biased downward. That is, the partition means consisting of the diaphragm 2d, the diaphragm 2e, and the connecting member 2h is urged downward by the coil spring 2n. The spring 2p connects the valve 2i to the connecting member 2.
In order to close the through hole 2m by contacting the valve 2i
is biased upward, and valve 2i, valve 2u, pipe 2
y and the coil spring 2p constitute a valve device. The spring 2q is provided in the container 2c to urge the actuating rod 2s attached to the diaphragm 2k downward against the gas pressure in the chamber 2l. The shaft 2r is connected to a rotating shaft 2t via a worm gear or the like, and is rotated by rotating the rotating shaft 2t in either the forward or reverse direction by the operation of the electric motor 2a, thereby extending or shortening the spring 2n. The actuating rod 2s is provided so as to be moved in either the up or down direction, and the actuating rod 2s is
The valve of the pressure control valve 3 is opened or closed by displacement in either the vertical direction due to deformation of the shaft 2r, and as described later, the valve of the pressure control valve 3 is opened or closed by displacement of the shaft 2r in either the vertical direction. is opened and closed. In addition, the valve control container 2c, the diaphragm 2
k, the coil spring 2q, and the actuating rod 2s constitute a pressure control valve actuating means 53. The potentiometer 1 is provided to detect the amount of rotation of the rotating shaft 2t or shaft 2r of the electric motor 2a. The pressure control valve 3 is provided in the middle of the gas pipe 4, and outputs gas having a predetermined gas pressure to the output pressure side pipe 5 in accordance with a set valve opening degree. Note that the chamber 2f and the chamber 2l communicate with each other through a hole 31, and when the partition means is moved downward, the input pressure side of the pressure control valve 3 communicates with the chamber 2f and the chamber through the hole 30. 2l
When the partition means is moved upward, the chamber 2g communicating with the output pressure side of the pressure control valve 3 is connected to the chamber 2f and the chamber 2 through the through hole 2m.
communicated with l. The gas pressure in the pipe 5, which is the output pressure, corresponds to the opening degree of the pressure control valve 3, and therefore, the signal obtained from the potentiometer 1 becomes pressure data corresponding to the gas pressure in the pipe 5. . Reference numeral 6 denotes an analog-to-digital conversion circuit that converts the signal obtained from the potentiometer 1 into a digital electrical signal, and the signal from the conversion circuit 6 is supplied to a comparison calculation circuit 7. The potentiometer 1 and the analog-digital conversion circuit 6 constitute a detector 54. Further, the pressure control valve control means 52 includes a pressure control valve actuation means 53, a partition means, and a valve device. The comparison calculation circuit 7 compares and calculates the corrected set pressure data from the calculation circuit 8 as a correction circuit and the signal as pressure data supplied from the conversion circuit 6 to determine the presence or absence of a difference, and calculates the difference as a result of the comparison. The detection signal is supplied to the drive circuit 9. Arithmetic circuit 8 is addition/subtraction device 1
Corrected pressure data from 0 and data readout circuit 1
The set pressure data corrected from the set pressure data stored in the main storage device 12 supplied from 1 is output. Data reading circuit 11 is clock circuit 1
The set pressure data stored in the main storage device 12 is read out from the time signal supplied from the controller 3 and the program number designation signal supplied from the designation circuit 14. The clock circuit 13 generates a time signal as a read instruction signal every time the set pressure data stored in the main storage device 12 is read. Main storage device 1
2 stores set pressure data for each time period. That is, for example, as shown by the set pressure curve 15 corresponding to the valve opening curve, the time period t ₀ at time T
Tube 5 at ~t ₆ , t ₆ ~t ₁₂ , t ₁₂ ~ t ₁₈ and t ₁₈ ~ t ₂₄
In order to make the gas pressures P in P ₁ , P ₂ , P ₃ and P ₄ respectively,
Set pressure data corresponding to gas pressures P ₁ , P ₂ , P ₃ , and P ₄ are stored in the main storage device 12 . In addition to the curve 15, the main memory 12 also contains a set pressure curve 1.
Setting pressure data based on No. 6 is also stored. Therefore, the data reading circuit 11 reads the designated circuit 14 by inputting the time signal supplied from the clock circuit 13.
One of the curves is selected based on the program number designation signal inputted from the program number designation signal, and the set pressure data corresponding to the relevant time is designated. Assuming that the period from time t ₀ to t ₂₄ is 24 hours, curve 15 or 16 corresponds to the set gas pressure for a day. Therefore, for example, if the usage amount in each time period within 24 hours differs depending on the season. By reading the set pressure data according to either side of the curve as appropriate for each season based on the program number designation signal inputted from the designation circuit 14, it is possible to set the optimal gas pressure commensurate with the usage amount. To set the gas pressure,
Curve 15 is defined as one cycle from time t ₀ to t ₂₄ .
or 16. Therefore, time _t24 corresponds to time _t0 .

The addition/subtraction device 10 performs addition/subtraction calculations from the adjustment pressure data set from the outside by telemeter control or a digital switch, and the corrected pressure data in the secondary storage device 18 read by the data read/write circuit 17, and calculates the updated corrected pressure data. arithmetic circuit 8 and data read/write circuit 17
Output to.

When the addition/subtraction device 10 is set with the addition/subtraction pressure data, the secondary storage device 18 uses the data read/write circuit 17 to set the addition/subtraction device 10 in accordance with the set pressure data for each time period in the main storage device 12.
Store the updated corrected pressure data.
On the other hand, a signal from the data read/write circuit 17 that has received the time signal from the clock circuit 13 supplies the stored corrected pressure data that has not been updated or has been updated to the addition/subtraction device 10 corresponding to each time.

The drive circuit 9 operates the electric motor 2a of the mechanical actuator 2 based on the supplied difference detection signal.

Gas pressure control device 20 configured in this way
For example, unmanned gas pressure control station 2
1. Next, this gas pressure control device 20
Explain the operation. First, at the time of initial setting, the main storage device 12 stores set pressure data for each time period as described above, while the secondary storage device 18 stores corrected pressure data for each time period with a correction amount of zero. is stored correspondingly. At time t ₀ , the clock circuit 13
When a time signal specifying time t ₀ is supplied to the readout circuit ₁₁ and the read/write circuit 17 from
Reads the set pressure data corresponding to the gas pressure P ₁ to be set at from the main storage device 12, supplies the read set pressure data to the arithmetic circuit 8,
The read/write circuit 17 receives this time signal and
Corrected pressure data corresponding to the gas pressure to be corrected at time t ₀ is read from the secondary storage device 18 according to the specified signal specified by the specifying circuit 14 , and the read corrected pressure data is supplied to the addition/subtraction device 10 . The adding/subtracting device 10 adds or subtracts externally set adjustment pressure data to the supplied corrected pressure data, and outputs the result of the addition/subtraction to the arithmetic circuit 8 as updated corrected pressure data. Here, if the corrected pressure data read at time t ₀ is zero and the adjustment pressure data set from the outside is zero, the addition/subtraction device 10 sends the updated corrected pressure data with a correction amount of zero to the calculation circuit. 8 and a read/write circuit 17, respectively.

The read/write circuit 17 receives the updated corrected pressure data supplied again in this way at the time.
The corrected pressure data corresponding to the gas pressure to be corrected at t ₀ is stored at the storage address of the secondary storage device 18 . Therefore, in this case, since the pressurization data is zero, the corrected pressure data corresponding to the gas pressure to be corrected at time t ₀ is stored in the secondary storage device 18 again without being changed. On the other hand, the arithmetic circuit 8
Since the corrected pressure data from the addition/subtraction device 10 at time t ₀ is zero, the set pressure data from the readout circuit 11 is output as is to the comparison calculation circuit 7 .

The comparison calculation circuit 7 compares and calculates the received corrected set pressure data with the pressure data from the conversion circuit 6 corresponding to the pressure of the gas currently being output into the pipe 5. By the way, the gas pressure inside the tube 5 at time t ₀
If it is set to P ₁ , when reading the set pressure data at time t ₀ , the comparison calculation circuit 7 will not output a difference detection signal, and therefore the drive circuit 9 will not operate.

Next, for example, at time t 6 six hours later, a time signal specifying time t ₆ is supplied from the clock circuit 13 to the read circuit 11 and the read/write circuit 17, and the main memory 12 supplies the gas pressure P ₂ to the clock circuit ₁₃ . Corresponding set pressure data and corrected pressure data corresponding to the gas pressure to be corrected at time _t6 are read from the secondary storage device 18, respectively, and supplied to the arithmetic circuit 8 and the addition/subtraction device 10, respectively. Similarly to the above, if the corrected pressure data from the secondary storage device 18 is zero, but no adjustment pressure data is set to the addition/subtraction device 10 from the outside, the addition/subtraction device 10 receives the updated corrected pressure data with a correction amount of zero. The signal is supplied to the arithmetic circuit 8 and the read/write circuit 17. The read/write circuit 17 stores the updated corrected pressure data from the adder/subtractor 10 at the storage address of the secondary storage device 18 that stored the corrected pressure data corresponding to the gas pressure to be corrected at time _t6 . On the other hand, since the corrected pressure data from the adder/subtractor 10 at time _t6 is zero, the arithmetic circuit 8 outputs the set pressure data from the readout circuit 11 as is to the comparison arithmetic circuit 7. Comparison calculation circuit 7 outputs a difference detection signal to drive circuit 9.

That is, the drive circuit 9 receives a difference detection signal based on the difference between the gas pressures P ₂ and P ₁ from the comparison calculation circuit 7, and thereby the drive circuit 9 receives the difference detection signal based on the difference between the gas pressures P 2 and P 1 .
Activate a. Here, the gas pressure to be set is
Since P ₂ is greater than the current gas pressure P ₁ , motor 2
The rotating shaft 2t of a is rotated so as to move the shaft 2r downward in order to open the pressure control valve 3 further. When the shaft 2r is moved downward, the spring 2n tends to be shortened, but its extension force simultaneously overcomes the gas pressure in the chamber 2g and deforms the diaphragms 2d and 2e, causing the connecting member 2h to move downward. move it. When the connecting member 2h is moved downward, the blockage state of the passage 2j by the valve 2i is released, and the high-pressure gas is introduced from the high-pressure gas pipe 4 before being supplied to the pressure control valve 3 into the chamber 2f via the passage 2j. It is also supplied to the chamber 2l, thereby deforming the diaphragm 2k of the container 2c and moving the actuating member 2s upward against the stretching force of the spring 2q. When the actuating member 2s is moved upward, the pressure control valve 3 is set to a more open state, and the gas pressure within the pipe 5 gradually increases and approaches the desired gas pressure _P2 . At the same time, a potentiometer 1 detects the amount of rotation of the rotating shaft 2t or shaft 2r of the conductive machine 2a, that is, detects the degree of opening of the pressure control valve 3, and outputs pressure data corresponding to the gas pressure in the pipe 5. At this point, the shaft 2r is rotated by the amount of movement that brings the gas pressure in the tube 5 to the set gas pressure _P2 , and the pressure data and time t supplied from the conversion circuit 6 to the comparison calculation circuit 7 change. ₆ , when the set pressure data supplied from the calculation circuit 8 become equal, the comparison calculation circuit 7 no longer outputs the difference detection signal, the drive circuit 9 operates to stop the operation of the electric motor 2a, and the shaft 2r stopped in the lowered position,
The spring 2n urges the connecting member 2h downward with a larger force. Next, the gas pressure in the tube 5 gradually increases to the set gas pressure _P2 , and the gas pressure in the chamber 2g overcomes the downward force of the spring 2n, and the connecting member 2
h is moved upward and the passage 2j is closed by the valve 2i, the supply of gas from the piping 4 to the chambers 2f and 2l via the passage 2j is stopped, and the passage 2j is closed by the valve 2i.
The increase in the gas pressure of P2 is stopped, the actuating member 2s shortens the spring 2q and is stopped at the raised position, and the valve opening of the pressure control valve 3 is adjusted to the gas pressure _P2 in the pipe 5.
is set to hold.

Thereafter, between times _t6 and _t12 , the gas pressure inside the pipe 5 is maintained at _P2 . By the way, if the gas pressure P ₂ supplied from the gas pressure control station 21 to each household, for example, between time t ₆ and t ₁₂ is insufficient, the pressure adjustment corresponding to the gas pressure ΔP ₁ to be increased is For example, data is added/subtracted from outside at time T ₁ .
When set to 0, the adder/subtractor 10 supplies the read/write circuit 17 with a signal instructing that new pressurization data has been set, and also sets the time.
Addition/subtraction calculations are performed from the corrected pressure data held from t ₆ and the set adjustment/depression data, and the results are supplied to the calculation circuit 8 and read/write circuit 17 . In this case, since the adjustment pressure data corresponding to the gas pressure ΔP ₁ to be increased is set, the addition/subtraction device 10
performs an addition operation on the corrected pressure data held from time _t6 . On the other hand, upon receiving the instruction signal from the addition/subtraction device 10, the read/write circuit 17 stores the addition/subtraction operation result supplied from the addition/subtraction device 10 as updated corrected pressure data to be corrected at time _t6 in the secondary storage device 18 at time t. The memory is updated to the memory address corresponding to ₆ . Therefore, after time _T1 , the updated corrected pressure data corresponding to the gas pressure _ΔP1 is stored at the memory address of the secondary storage device 18 that stores the corrected pressure data to be corrected at time _t6 . On the other hand, the gas pressure ΔP ₁ is newly added from the addition/subtraction circuit 10.
When _the updated corrected pressure data corresponding _{to .} The pressure data is added and supplied to the comparison calculation circuit 7 as new set pressure data. Therefore, between times T ₁ and t ₁₂ , the gas pressure inside the pipe 5 is set to (P ₂ +ΔP ₁ ). next,
For example, at time t ₁₂ after 12 hours, clock circuit 1
3 supplies the readout circuit 11 and the readout/write circuit 17 with a time signal specifying time t ₁₂ , the main storage device 12 receives the set pressure data corresponding to the gas pressure P ₃ , and the secondary storage device 18 provides the time signal.
At _t12 , corrected pressure data corresponding to the gas pressure to be corrected is read out, and supplied to and held in the arithmetic circuit 8 and addition/subtraction device 10, respectively. Here, since the corrected pressure data corresponding to the gas pressure to be corrected read from the secondary storage device 18 is zero, the pipe ₅ is
The gas pressure inside is set to _P3 . Thereafter, between times _t12 and _t18 , the gas pressure in the pipe 5 is maintained at _P2 . By the way, contrary to the above, if the pressure P ₃ of gas supplied to each household from the gas pressure control station 21 between time t ₁₂ and t ₁₈ is excessive, the gas pressure ΔP ₂ to be reduced is When the pressure data to be set is externally set in the adding/subtracting device 10 at time _T2 ,
The addition/subtraction device 10 provides a read/write circuit 17 with
At the same time as supplying a signal instructing that new pressurization data has been set, subtracting the pressurization data from the corrected pressure data held from time _t12 ,
The result is supplied to the arithmetic circuit 8 and the read/write circuit 17. The read/write circuit 17 is
When an instruction signal is received from the addition/subtraction device 10, the subtraction result supplied from the addition/subtraction device 10 is sent to the time t _12.
The updated corrected pressure data to be corrected is stored and updated in the storage address corresponding to time _t12 of the secondary storage device 18. Therefore, after time T ₂ , the corrected pressure data corresponding to the gas pressure ΔP ₂ is stored in the memory address of the secondary storage device 18 that stores the corrected pressure data to be corrected at time t ₁₂ . On the other hand, when the updated corrected pressure data corresponding to the gas pressure ΔP ₂ is newly supplied from the adding/subtracting device 10 to the arithmetic circuit 8, the arithmetic circuit 8 outputs the data corresponding to the gas pressure P ₃ held from time t ₁₂ . The corrected pressure data corresponding to the gas pressure ΔP ₂ is subtracted from the set pressure data and is supplied to the comparison calculation circuit 7 as new set pressure data. Therefore, between time T ₁₂ and t ₁₈ , the gas pressure (P ₃ −
The inside of the pipe 5 is set to ΔP ₂ ). That is, at time T ₂ , the current gas pressure P ₃ in the pipe 5 is higher than the gas pressure (P ₃ - ΔP ₂ ) to be set, so the drive circuit 9 adjusts the gas pressure (P ₃ - ΔP 2 ) A difference detection signal based on the difference between _P2 ) and _P3 is received from the comparison calculation circuit 7, and the motor 2a is reversely rotated by the drive circuit 9 so that the valve opening of the pressure control valve 3 is small. 2r is rotated so as to move upward, and the downward force exerted by the spring 2n on the connecting member 2h is reduced.
Due to the gas pressure in the chamber 2g, the connecting member 2h is moved upward along with the deformation of the diaphragms 2d and 2e,
As a result, the contact between the valve 2i and the connecting member 2h is released, the through hole 2m is opened, and the gas in the chamber 2f having a higher gas pressure than the gas pressure in the chamber 2g is transferred to the chamber 2g.
g, and the gas pressure in chambers 2f and 2l decreases. When the gas pressure in the chamber 2l decreases, the actuating member 2s
is moved downward by the stretching force of the spring 2g, the pressure control valve 3 is set to a more closed state, and the gas pressure in the pipe 5 is sequentially reduced to the desired gas pressure (P ₃ −ΔP ₂ ). Similarly, the signal from the potentiometer 1 that detects the amount of rotation of the rotating shaft 2t or shaft 2r of the electric motor 2a changes, and the gas pressure in the pipe 5 is set to the gas pressure (P ₃ −ΔP ₂ ).
When the shaft 2r is rotated by the amount of movement equal to the amount of movement, and the pressure data supplied from the conversion circuit 6 to the comparison calculation circuit 7 becomes equal to the set pressure data from the calculation circuit 8 at time _T2 , the comparison calculation circuit 7 outputs The difference detection signal is no longer output, the drive circuit 9 operates to stop the operation of the electric motor 2a, the shaft 2r is stopped at its raised position, and the spring 2n urges the connecting member 2h downward with a smaller force. do. Also,
The gas pressure in the pipe 5 gradually decreases to the set gas pressure (P ₃
-ΔP ₂ ), the downward force of the spring 2n overcomes the gas pressure in the chamber 2g, the connecting member 2h is moved downward, and the through hole 2m is closed by the valve 2i. Communication between the chambers 2g and 2f is blocked, the drop in the gas pressure in the chamber 2l is stopped, the actuating member 2s is stopped at its lowered position, and the opening degree of the pressure control valve 3 is adjusted according to the gas pressure in the pipe 5 ( P ₃ −
ΔP ₂ ).

The same applies thereafter, from time t ₁₈ to 24 18 hours later.
During the time t ₂₄ after the time, the addition/subtraction device 10
Assuming that the pressure data is not set externally at _t18 and _t24 , the corrected pressure data read out from the secondary storage device 18 at times t18 and t24 is zero, so the settings inside the tube 5 are the same as those read out from the main storage device 12, respectively. Gas pressures P ₄ and P ₁ are set based on pressure data.
Note that time t ₂₄ corresponds to time t ₀ as described above, and therefore, after time t ₂₄ , the operations after time t ₀ are repeated. By the way, at time t ₃₀ (corresponding to time t ₆ ), the corrected pressure data corresponding to the gas pressure ΔP ₁ stored at time T ₁ is read from the secondary storage device 18 and set in the addition/subtraction device 10. The arithmetic circuit 8 outputs set pressure data corresponding to the gas pressure (P ₂ +ΔP ₁ ), so the gas pressure inside the pipe 5 is (P ₂ +ΔP 1 ).
ΔP ₁ ). Similarly, from time t ₃₆ to t ₄₂ (corresponding to time t ₁₂ to t ₁₈ ),
The gas pressure inside the pipe 5 is set to (P ₃ −ΔP ₂ ).

Note that time t ₀ to _{t 24} is the initial adjustment period, and time t ₂₄
If the period after that is the actual supply operation period, time t ₂₄
Alternatively, the updated corrected pressure data read from the secondary storage device 18 may be directly supplied to the arithmetic circuit 8 without being supplied to the adding/subtracting device 10 to obtain the corrected set pressure data.

After adjusting the opening degree of the pressure control valve 3, the automatic control function of the mechanical actuator 2 allows the gas pressure in the pipe 5 to fluctuate depending on the amount used.
Automatically adjusts to the set gas pressure.

In the above specific example, the time signal is generated every 6 hours, but instead of this, the time signal may be generated every 1 hour or every 6 hours.
The time signal may be generated every 30 minutes, or the time signal may be generated at irregular intervals, such as every 10 minutes in a certain time zone and every 2 hours in another time zone. , correspondingly, the set pressure data and control start time may be stored in advance in the memory circuit. Further, although a potentiometer is provided to detect the amount of rotation of the shaft of the mechanical actuator or the rotating shaft of the electric motor, the present invention is not limited thereto. Further, it is not necessary to provide two storage devices; one storage device may be shared. Additionally, the main storage device 12 may be of a read-only memory type.

As described above, according to the present invention, local control can be performed inexpensively and reliably, and valve opening control can be performed more accurately than with mechanical methods. Since it can be formed using a digital processing circuit, for example a microcomputer,
Miniaturization, high precision, and low cost can be achieved. Furthermore, in cases where the gas pressures to be set at the gas pressure control stations where the device is installed are slightly different, or when the operating accuracy of the control mechanism is slightly different between each gas pressure control station, the data stored in the main memory The optimum gas pressure can be set for each gas pressure control station without the need to update the gas pressure.

In the gas pressure control device of the present invention, the pressure control valve control means consisting of the pressure control valve operating means, the partition means, and the valve device is connected to the motor and the electric circuit section via the shaft means, so that the pressure control valve control means is a gas circuit. The pressure control valve control means is completely separated from the electrical system. Therefore, the gas pressure control device of the present invention has the advantage of being extremely safe in terms of explosion protection.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electric circuit section 51 according to a preferred embodiment of the present invention, FIG. 2 is an explanatory diagram of a preferred embodiment according to the present invention, and FIG. 3 is a set pressure curve diagram. DESCRIPTION OF SYMBOLS 1... Potentiometer, 2... Mechanical operation part, 3... Pressure control valve, 7... Comparison calculation circuit, 8
. . . Arithmetic circuit, 10 . . . Addition/subtraction device, 12 . . . Main memory device, 13 . Pressure control valve operating means, 54...
Detector.

Claims (1)

[Claims for Utility Model Registration] Pressure control valve 3, mechanical operating section 2, and electric circuit section 5
1, the mechanical operating section 2 includes a shaft means 2r that can move forward and backward.
, a motor 2a for advancing and retracting the shaft means 2r, and a pressure control valve control means 5 connected to the shaft means 2r.
2, the electric circuit section 51 has a detector 54 that detects the advance and retreat of the shaft means 2r and outputs pressure data;
A clock circuit 13 that outputs a time signal, a main memory 12 that stores set pressure data for each time zone,
a data readout circuit 11 that reads set pressure data from the main storage device 12 in response to a time signal supplied from the clock circuit 13; and a secondary storage device 18 that stores corrected pressure data for each time period with respect to the set pressure data; While writing the corrected pressure data in the secondary storage device 18, the clock circuit 1
a read/write circuit 17 that reads the corrected pressure data from the secondary storage device 18 in response to a time signal supplied from the sub-storage device 18; When the read/write circuit 17 reads the secondary storage device 1,
The corrected pressure data updated from the corrected pressure data read from 8 and the increased/decreased pressure data at the time corresponding to this setting is supplied to the secondary storage device 18 via the correction circuit 8 and the read/write circuit 17. an adding/subtracting device 10, the correction circuit 8 which corrects the setting pressure data from the reading circuit 11 using the updated corrected pressure data from the adding/subtracting device 10, and outputs the corrected setting pressure data; A comparison calculation circuit 7 outputs a difference signal based on the corrected setting pressure data output from the correction circuit 8 and pressure data from the detector 54, and a comparison calculation circuit 7 outputs a difference signal based on the corrected set pressure data output from the correction circuit 8 and the pressure data from the detector 54. The pressure control valve control means 52 has a drive circuit 9 for operating the partition means 2.
d, 2e, 2h and valve devices 2i, 2y, 2p, 2u
and a communication port 31, and a pressure control valve operating means 53, and each of the partition wall means 2d, 2e, and 2h receives a spring force determined by the movement of the shaft means 2r on one side, and The other surface facing the surface receives the gas pressure on the output pressure side of the pressure control valve 3, is deformable according to the difference between the received spring force and the gas pressure, and moves along with this deformation. It includes a moving means 2h, the valve devices 2i, 2y, 2p, 2u are connected to the partition means 2d, 2e, 2h, and the pressure control valve is moved by moving the moving means 2h in the first direction. By moving the input pressure side valve means 2u and the moving means 2h in a second direction opposite to the first direction, the output pressure side and the communication port 31 are brought into communication with each other. and output pressure side valve means 2i for communication, and the pressure control valve operating means 52 is connected to the communication port 31.
A gas pressure control device characterized in that the valve opening degree of the pressure control valve 3 provided in the middle of the pipes 4 and 5 is adjusted according to the gas pressure received through the pipes 4 and 5.