JPH0740211Y2 - Concentration measuring device - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a concentration measuring device for measuring the concentration of a suspension such as sludge, and more particularly to a concentration measuring device for preventing inversion of a pressure diaphragm.

[Prior art]

FIG. 3 is a sectional view showing a conventional general repair gate type concentration measuring device. In the figure, 1 is a sludge conduit as a main sludge in which a suspension of sludge or the like flows, and both ends of this sludge conduit 1 are used to connect an upstream sludge conduit and a downstream sludge conduit which are not shown. The flange portions 1a and 1b are integrally formed. Further, the sludge conduit 1 has a raised portion 1c integrally formed on the inner wall portion and an opening 1d facing the raised portion 1c. The sludge conduit 1 is provided with a concentration measuring chamber 2 which communicates with the opening 1d of the sludge conduit 1 and which projects and branches outward. This concentration measuring chamber 2 is a valve mounting consisting of a cylindrical body communicating with the opening 1d of the sludge pipeline 1 through the opening 3a of the repair gate mounting cover 3 mounted on the outer wall surface of the sludge pipeline 1. It has a tubular body 4 and a sensor mounting tubular body 5 detachably connected to the upper end of the valve mounting tubular body 4, and an outer casing 7 is provided on the upper end of the sensor mounting tubular body 5 via a pressure diaphragm 6. Is detachably fixed, and a pressure chamber 7a for pressurizing the pressure diaphragm 6 from the outside is formed in the outer box 7. A sluice valve 8 that opens and closes the concentration measuring chamber 2 is rotatably and pivotally supported in the valve mounting cylinder 4.
Is opened and closed by a cylinder valve (not shown in FIG. 3) between a valve opening position (solid line position) and a valve closing position (dotted line position) of 90 degrees. Further, concentration sensors 9 and 10 composed of a pair of ultrasonic wave transmitters and receivers are arranged at positions facing the sensor mounting cylinder 5. Further, a leak detector 11 is attached to the outer box 7, and pressurized air from a supply / discharge control means (not shown) is supplied / exhausted into / from the outer box 7, and in a normal case, Pressurized air from the air compressor is supplied into the outer box 7, and the pressurized air in the outer box 7 is opened to the atmosphere. On the other hand, a repair gate 12 that slides and opens the opening 1d of the sludge pipeline 1 is installed in the repair gate mounting cover 3. The repair gate 12 is rotatably supported in a fixed position in the repair gate mounting cover 3 and has one end connected to a moving piece 14 screwed to a screw rod 13 projecting outward. By rotating the outer end of 13 with a spanner or the like, the moving piece 14 is screw-fed to open and close the repair gate 12. Next, the operation will be described. In the open state of the repair gate 12, the suspension flowing in the sludge conduit 1 is guided by the raised portion 1c in the arrow direction of FIG. Therefore, when the sluice valve 8 is rotated by 90 ° with the cylinder valve to sample the suspension and the valve is opened to the dotted line position in FIG.
The suspension flowing through the sludge conduit 1 is introduced into the concentration measuring chamber 2 by the cooperative action of the sluice valve 8 in the open state and the raised portion 1c. Therefore, when the gate valve 8 is opened, the sludge pipeline 1 is
Most of the suspension flowing from the upstream side flows through the concentration measuring chamber 2 to the downstream side of the sludge pipeline 1. In this state, when the sluice valve 8 is closed at the horizontal position indicated by the solid line in the figure, the suspension in the same suspension state as the suspension flowing through the sludge conduit 1 is enclosed in the concentration measuring chamber 2. Collected. When pressurized air is supplied into the pressurizing chamber 7a after enclosing and sampling such a suspension (sampling), the airtight movable film 6 is deformed by pressurization inward by the pressurized air, whereby the concentration measurement is performed. The suspension sampled in the chamber 2 is pressurized and defoamed. Then, under such pressure and defoaming condition, the concentration sensor 9,10
The sludge concentration of the suspension is measured by. In such a conventional concentration measuring device, the sludge pipe line 1 and the concentration measuring chamber 2 may have a negative pressure when the sluice valve 8 is opened. In this case, the pressure diaphragm 6 in the concentration measuring chamber 2 is pulled toward the sludge pipeline 1 side by the negative pressure generated due to the sludge fluid flowing in the sludge pipeline 1 as shown by the dotted line in FIG. However, due to the restoration of the pressure diaphragm 6 itself, the pressure diaphragm 6 cannot be returned to the normal position, resulting in trouble in the subsequent pressurization / defoaming and concentration measurement of the suspension. Therefore, as a means for preventing the pressure diaphragm 6 from reversing, there are the concentration measuring devices of the restoring spring type and the atmosphere opening / closing valve type shown in FIGS. 4 and 5. First, the restoration spring type concentration measuring device shown in FIG. 4 will be described. In this concentration measuring device, the pressurizing chamber 7a is used.
A restoring spring 15 is incorporated in the mutual center portion of the pressure diaphragm 6 and the outer box 7 inside, and the tensile force of the restoring spring 15 (the force pulling the pressure diaphragm 6 to the pressure chamber 7a side) is adjusted to the sludge pipeline 1 side. Is set to be smaller than the suction force to the sludge pipeline 1 side due to the negative pressure of, and smaller than the pressing force that is supplied into the pressurizing chamber 7a and pressurizes and deforms the pressure diaphragm 6 to the sludge pipeline 1 side. is doing. Therefore, it is possible to prevent the pressure diaphragm 6 from being reversed by the tensile force of the pressure diaphragm 6 by the restoring spring 15. In the concentration measuring device of the atmosphere open / close valve system shown in FIG.
In the pressure pipe 17 that connects the inside of the pressure chamber 7a and the compressor 16,
An atmosphere release stop valve (solenoid valve) 18 and a three-way solenoid valve 19 with an atmosphere release port are provided from the pressure chamber 7a side, and a pressure diaphragm is provided by supplying compressed air from the compressor 16 into the pressure chamber 7a. The pressurizing pipe 17 is opened to the atmosphere except when the pressurization of 6 is performed, and the pressurizing pipe 17 is opened at the time of the pressurizing and the time of not releasing
Is closed by the atmosphere open / close valve 18 and the three-way solenoid valve 19. As a result, when the pressure diaphragm 6 is sucked due to the negative pressure generated on the sludge conduit 1 side, the negative pressure is generated on the pressure chamber 7a side, so that the pressure diaphragm 6 is less likely to be inverted. I have to.

[Problems to be solved by the device]

In the conventional restoring spring type concentration measuring device, it is difficult to set the tensile force of the restoring spring 15 and it is possible to prevent the restoring spring 15 from prematurely deteriorating. There were problems such as not always expecting smooth operation. Moreover, in the conventional concentration measuring device of the atmosphere open / close valve system,
As a measure for preventing the pressure diaphragm 6 from reversing, complicated electric work including installation of a solenoid valve and circuit modification is required, and the installation becomes complicated due to the installation of the solenoid valve and the installation of the solenoid valve control device. There is a problem that it is limited and it takes time to cope with the existing concentration measuring device. This invention has been made to solve the above problems, does not require any electrical work, can easily support existing equipment, and reliably prevents the pressure diaphragm from inverting. It is an object of the present invention to provide a concentration measuring device that can be used.

[Means for Solving the Problems]

The concentration measuring device according to the present invention is attached to a sludge pipeline through which a suspension of sludge or the like whose concentration is to be measured flows, and a concentration measuring degree communicating with and branched from the sludge pipeline and installed in the concentration measuring chamber. A pressure diaphragm, and a sluice valve for opening and closing the concentration measuring chamber on the sludge conduit side of the pressure diaphragm,
A valve opening / closing means connected to a pressure fluid supply source to open / close the sluice valve by a supply fluid pressure from the pressure fluid supply source; and a side wall of the concentration measuring chamber between the sluice valve and the airtight movable membrane. And a concentration detecting means provided, pressurizing and deforming the pressure diaphragm inward when the gate valve is closed to pressurize the suspension introduced into the concentration measuring chamber, and the suspension in the pressurized state. In a concentration measuring device for measuring the concentration by the concentration detecting means, a reversal prevention for preventing the pressure diaphragm from being reversed to the sludge conduit side by a negative pressure in the concentration measuring chamber, which is connected to the pressure diaphragm. The cylinder is provided with an inversion prevention cylinder, and the inversion prevention cylinder is driven in the inversion prevention direction of the pressure diaphragm by the return pressure fluid when the sluice valve is opened.

[Action]

In the concentration measuring device according to the present invention, when the sluice valve in the concentration measuring chamber is opened, the return pressure fluid from the valve opening / closing means of the sluice valve is supplied to the inversion prevention cylinder.
The inversion prevention cylinder is driven in the inversion prevention direction of the pressure diaphragm. Therefore, the reversal prevention cylinder reliably prevents the pressure diaphragm from reversing.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a sectional view of a concentration measuring device according to an embodiment of the present invention,
FIG. 2 is an enlarged cross-sectional view of an essential part of FIG. 1, and FIGS.
The same or corresponding parts as those in the figure are designated by the same reference numerals and duplicate description will be omitted. In FIG. 1, 20 is a cylinder valve that is connected to the valve shaft of the sluice valve 8 in the concentration measuring chamber 2 and serves as a valve opening / closing means for driving the sluice valve 8 to open and close. A closing-side conduit 21 for closing the valve 8 and an opening-side conduit 22 for opening the sluice valve 8 are connected, and the closing-side conduit 21 and the opening-side conduit 22 are electromagnetic valves 23. Is connected to a pressure fluid supply source 24 such as a compressor. The pressure fluid supply source 24 is connected to the inlet 7b of the pressurizing chamber 7a via a pressurizing conduit 17 having a pressurizing solenoid valve 25. On the other hand, an inversion prevention cylinder 30 is provided outside the outer box 7 forming the pressurizing chamber 7a. A piston rod 31 of the inversion prevention cylinder 30 slidably penetrates a bearing sleeve 32 penetrating the outer casing 7 and is connected to a central portion of the pressure diaphragm 6. In addition, for introducing a pressure fluid to the bottom side of the inversion prevention cylinder 30, a piston 33 of the inversion prevention cylinder 30 is pressed in the inversion prevention direction of the pressure diaphragm 6 (upward direction in the drawing). An entrance port 34 is provided. A branch pipe 35 from the opening side pipe 22 is connected to the inlet port 34. Further, an air inlet / outlet port 36 is provided in the head portion of the inversion prevention cylinder 30. The air inlet / outlet port 36 sucks and discharges air into / from the cylinder chamber on the side of the air inlet / outlet port 36 in the inversion prevention cylinder 30 according to the reciprocating movement of the piston 33. Next, the operation will be described. First, when measuring the concentration of the suspension flowing through the sludge conduit 1, while the suspension flowing through the sludge conduit 1 is flowing through the concentration measuring chamber 2, the pressure fluid from the pressure fluid supply source 24 is Cylinder valve 20 through solenoid valve 23 and passage 21 on the closing side
Is supplied to the cylinder valve 20, the cylinder valve 20 operates to close the gate valve 8. As a result, the suspension introduced into the concentration measuring chamber 2 is enclosed by the gate valve 8. Then, after closing the sluice valve 8, the pressure fluid supply source
The pressure fluid from 24 is supplied from the inlet 7b into the pressurizing chamber 7a through the pressurizing conduit 17 via the pressurizing electromagnetic valve 25. As a result, the pressure diaphragm 6 is pressurized by the pressure fluid, and the pressure diaphragm 6 pressurizes and defoams the enclosed suspension in the concentration measuring chamber 2. Then, in this state, the concentration of the suspension is measured by the concentration sensor.
It is detected and measured at 9,10. After such concentration measurement, by switching the solenoid valve 23, the cylinder valve 20 operates in the opening direction of the gate valve 8. As a result, the gate valve 8 is opened. At this time, the return pressure fluid from the cylinder valve 20 passes through the pressurizing conduit 17, so that the return pressure fluid is supplied from the inlet port 34 into the inversion prevention cylinder 30 via the branch conduit 35. Therefore, by the return pressure fluid from the cylinder valve 20,
The piston 33 of the inversion prevention cylinder 30 is pressed and operates, and the piston rod 31 integrated with the piston 33 moves upward. Accordingly, the pressure diaphragm 6 is pulled by the piston rod 31 in the inversion prevention direction, and the pressure diaphragm 6 is held in the inversion prevention position.

[Effect of device]

As described above, according to the present invention, when the sluice valve in the concentration measuring chamber is opened, the return pressure fluid from the valve opening / closing means of the sluice valve is supplied to the inversion prevention cylinder, whereby the inversion prevention cylinder is provided. Since the cylinder is driven in the direction to prevent the pressure diaphragm from reversing, no complicated electric work is required as in the past, and the pressure diaphragm can be surely prevented from reversing only with the fluid mechanical cylinder. Moreover, since the inversion prevention cylinder can use the existing pressure fluid for the concentration measuring device, it has an excellent effect that it can be easily applied to the existing concentration measuring device.

[Brief description of drawings]

FIG. 1 is a sectional view of a concentration measuring apparatus according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an essential part of FIG. 1, and FIG. 3 is a sectional view of a conventional general concentration measuring apparatus. FIG. 5 is a cross-sectional view of a conventional restoration spring type concentration measuring device, and FIG. 5 is a cross-sectional view of a conventional atmosphere open / close valve type concentration measuring device. 1 ... Sludge pipeline, 2 ... Concentration measuring chamber, 6 ... Pressurized diaphragm, 8 ... Gate valve, 9,10 ... Concentration sensor (concentration detecting means), 20 ... Cylinder valve (valve opening / closing means), 30 ... Inversion prevention Cylinder. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A concentration measuring chamber attached to a sludge pipeline through which a suspension of sludge or the like whose concentration is to be measured flows, and a pressure diaphragm stretched in the concentration measuring chamber. And a sluice valve that opens and closes the concentration measurement chamber on the sludge conduit side of the pressure diaphragm, and a valve that is connected to a pressure fluid supply source and that opens and closes the sluice valve by the fluid pressure supplied from the pressure fluid supply source. Means and a concentration detecting means provided on the side wall of the concentration measuring chamber between the sluice valve and the airtight movable membrane, and when the sluice valve is closed, the pressure diaphragm is pressurized and deformed inward. Then, the introduced suspension in the concentration measuring chamber is pressurized, and in the concentration measuring device for measuring the suspension concentration in the pressurized state by the concentration detecting means, the pressure diaphragm is connected to the pressure diaphragm. Negative pressure in the above concentration measurement chamber An inversion prevention cylinder for preventing inversion to the sludge conduit side is provided, and this inversion prevention cylinder is driven in the inversion prevention direction of the pressure diaphragm by the return pressure fluid when the sluice valve is opened. A concentration measuring device characterized in that