JP2008157909A - Liquid level detection device of well - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect accurately the liquid level of a well regardless of a change of an environmental temperature by securing sufficient durability and by simplifying the structure. <P>SOLUTION: A detection pipe 2 is inserted into the well 1 so that the tip part is dipped into liquid in the well 1, and a diaphragm 7 formed by winding a capillary in a coil shape is interposed between a pressurized gas supply source 3 capable of supplying continuously pressurized gas having a pressure and a quantity sufficient to leaking out the gas from the tip of the detection pipe 2 and the detection pipe 2, and passage/blocking of the pressurized gas from the pressurized gas supply source 3 to a detouring conduit 10 detouring the diaphragm 7 is switched by a selector switch 5, and a pressure detector 12 for detecting a pressure in the detection pipe 2 is connected to the detection pipe 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in a well level detecting device.

Connect the air supply source to the detection tube inserted in the hot spring well and detect the pressure in the detection tube with the air supply from the air supply source to the detection tube cut off after the air leaks from the tip of the detection tube. For example, Japanese Patent Application Laid-Open No. H10-228473 has already known a technique for detecting the liquid level of a well.
JP 2006-71554 A

  However, depending on the place where the hot spring well is installed, the change in the environmental temperature is large. Like the liquid level detection device disclosed in Patent Document 1, air is intermittently supplied from the air supply source to the detection tube. In the state where the air supply is stopped, the volume of air in the detection tube may change greatly due to the conversion of the environmental temperature, thereby reducing the accuracy of detection of the molten metal surface.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a well liquid level detection apparatus that can accurately detect the liquid level of a well even by a change in environmental temperature.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a detection tube inserted into the well so that the tip is immersed in the liquid in the well, and gas is constantly leaked from the tip of the detection tube. A pressurized gas supply source capable of continuously supplying a pressurized gas of sufficient pressure and amount, and a thin tube wound in a coil shape, and interposed between the detection tube and the pressurized gas supply source A bypass that can bypass the throttle and guide the pressurized gas from the pressurized gas supply source to the detection tube, and the bypass conduit of the pressurized gas from the pressurized gas supply source And a pressure sensor connected to the detection tube so as to detect the pressure in the detection tube.

  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, an electromagnetic on-off valve in which a valve opening time and a valve opening time are set by a timer is interposed in the bypass pipe. Features.

  According to the configuration of the invention described in claim 1, in a state where the flow of the pressurized gas from the pressurized gas supply source to the detour pipe is blocked by the switching valve, the flow rate is reduced by the throttle. The pressurized gas is constantly supplied to the detection tube, and a small amount of gas is constantly leaked out from the tip of the detection tube, and the pressure in the detection tube at that time is from the tip of the detection tube to the liquid level. The pressure corresponding to the liquid head level can be accurately detected by the pressure detector that detects the pressure in the detection tube, and the amount of gas supplied to the detection tube is small. Therefore, it is possible to reduce the size of the pressurized gas supply source. In addition, since a small amount of gas is constantly supplied into the detection tube, the volume of the gas in the detection tube does not change greatly even if the environmental temperature changes, and the liquid level of the well can be detected accurately even if the environmental temperature changes. can do. In addition, when the switching valve is operated so as to allow the flow of the pressurized gas from the pressurized gas supply source to the detour pipe, a relatively large amount of gas can be supplied into the detection pipe. The level can be detected promptly. Furthermore, depending on the depth of the well, the pressure required by the pressurized gas supply source changes. In the case of a deep well, it is necessary for the pressurized gas supply source to supply a relatively large amount of gas to the detection tube. In order to supply a small amount of gas to the detection tube by sufficiently throttling such a high-pressure gas with a throttling, the throttling with a small hole diameter makes the hole diameter extremely small. It is necessary and difficult to process, but because the narrow tube is wound in a coil shape and the aperture is configured, it is easy to process, and the degree of aperture can be changed by changing the length of the narrow tube Can easily cope with changes in well depth.

  According to the second aspect of the present invention, since the electromagnetic opening / closing valve whose valve opening timing and valve opening time are set by a timer is interposed in the bypass pipe, a high-pressure pressurized gas is required because the well is deep. When a pressurized gas cylinder such as a nitrogen cylinder must be used as the pressurized gas supply source, the number of times the cylinder is replaced increases as the amount of pressurized gas supplied from the cylinder increases. Since this increases the cost, the amount of consumption can be reduced by supplying pressurized gas from the cylinder to the detection pipe through the bypass line only when the electromagnetic on-off valve is opened. When replacing the cylinder, the supply of pressurized gas to the detection tube is stopped by supplying a small amount of pressurized gas from the pressurized gas supply source whose flow rate is reduced by the restriction to the detection tube. The liquid that has entered the detection tube can be removed from the detection tube.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 and 2 show a first embodiment of the present invention. FIG. 1 is a diagram showing a configuration of a liquid level detection device, and FIG. 2 is a longitudinal sectional view of a pressure detector.

  First, in FIG. 1, a well 1 which is a hot spring well, for example, is excavated on the ground, and in order to detect the liquid level L in the well 1, for example, a detection tube 2 having an inner diameter of 8 mm.phi. The tip of the detection tube 2 is immersed in hot water. Moreover, the detection tube 2 is formed of a material having heat resistance and corrosion resistance, and is made of stainless steel such as SUS304 or SUS306L or a fluororesin. Further, on the ground surface, for example, a nitrogen cylinder 3 as a pressurized gas supply source is detected through a pipe 4, a three-way valve 5 which is a switching valve, a pipe 6, a throttle 7, a pipe 8 and a T-shaped pipe joint 9. The three-way valve 5 is connected to the pipe 2, and the three-way valve 5 bypasses the throttling 7 and can guide the pressurized nitrogen gas from the nitrogen cylinder 3 to the detection pipe 2, a bypass pipe 10, a T-shaped pipe joint 11, and Connected to the detection pipe 2 via the pipe joint 9, and a pressure detector 12 is connected to the pipe joint 11.

  The nitrogen cylinder 3 is provided with a manual control valve 13 and a pressure gauge 14, and by changing the opening of the control valve 13 while looking at the pressure gauge 14, a pressurized gas adjusted to a predetermined pressure, that is, a pressurized gas, is added. Pressurized nitrogen gas is supplied to the conduit 4.

  The diaphragm 7 is formed by winding a thin tube in a coil shape, and the degree of narrowing of the diaphragm 7 is changed by changing the length of the thin tube, that is, the number of turns. In addition, the diaphragm 7 is built in the protective case 15 and the pipes 6 and 8 are protected so that the diaphragm degree is not changed by collision with other members during transportation or assembly. It is fixed to the case 15.

  Thus, a small amount of pressurized nitrogen gas throttled by the throttle 7 is always supplied to the detection tube 2 at a pressure sufficient to cause nitrogen gas to leak out from the tip of the detection tube 2. The three-way valve 5 is connected to the pipe 6 connected to the nitrogen cylinder 3, but is disconnected from the bypass duct 10, and the pipe 6 connected to the bypass pipe 10 is connected to the bypass pipe 10. The state to be shut off can be switched according to a manual operation.

  In FIG. 2, the casing 17 of the pressure detector 12 is formed by caulking and joining the peripheral portions of a pair of casing halves 18 and 19, and a connecting cylinder portion 18 a provided at the center of one casing halves 18. A nut 20 is rotatably attached to the nut. Further, a male screw 38 for screwing the nut 20 is engraved on the outer surface of the distal end portion of the branch pipe portion 11a included in the pipe joint 11, and the gasket 22 is sandwiched between the connecting cylinder portion 18a and the branch pipe portion 11a. .

  The caulking joints of the two casing halves 18 and 19 constituting the casing 12 sandwich the peripheral edge of the diaphragm 23. The diaphragm 23 is concentric by processing, for example, a stainless steel thin disc. It is formed into a wave shape. Thus, a pressure chamber 24 that faces one surface of the diaphragm 23 is formed between the casing half 18 of the casing 12 and the diaphragm 23 so as to communicate with the inside of the detection tube 2.

  An opening 25 is provided in the central portion of the other casing half 19, and the printed circuit board 26 is disposed so as to cover the opening 25 from the outside. In addition, a pair of cylindrical spacers 27 and 27 are interposed between the printed circuit board 26 and the casing half 19, and screw members 28 and 28 inserted through the printed circuit board 26 and both the spacers 27 and 27, respectively. By being screwed into the casing half 19 in the casing 17, the printed board 26 is fixed to the casing half 19 so as to face the other surface side of the diaphragm 23 through the opening 25.

  On the inner surface side of the printed circuit board 26, a primary coil 30 and a secondary coil 31 surrounding the primary coil 30 are fixedly supported coaxially with the center of the diaphragm 23. Thus, the primary coil 30 is always energized, and a voltage is generated in the secondary coil 31 by the lines of magnetic force from the primary coil 30 generated by the energization. The energization to the primary coil 30 and the secondary coil 31 are generated. A harness 32 for detecting the generated voltage is connected to the printed circuit board 26.

  Incidentally, disk-shaped retainers 33 and 34 are in contact with both surfaces of the center portion of the diaphragm 23, and the first coil spring 35 is contracted between the retainer 33 and the casing half 18, and the other retainer 34. The second coil spring 36 is contracted between the casing half 19 and the spring loads of the first and second coil springs 35 and 36 are set to be the same, and both the retainers 33 and 34 are the first and second coil springs. It is substantially fixed to the central portion of the diaphragm 23 by the spring force exerted by 35 and 36.

  A retainer 34 that is substantially fixed to the other surface of the diaphragm 23 is integrally provided with a support protrusion 34a that is coaxial with the center portion of the diaphragm 23 and protrudes toward the printed circuit board 26, and the support protrusion 34a. Are fitted and fixed to one end of a shielding cylinder 37 made of a nonmagnetic metal material such as stainless steel or copper. That is, one end of the shielding cylinder 37 is fixed to the center of the other surface of the diaphragm 23.

  The other end of the shielding cylinder 37 is inserted between the primary and secondary coils 30 and 31 so that the amount of insertion can be changed. That is, the shielding cylinder 37 changes the amount of insertion between the primary and secondary coils 30 and 31 in accordance with the amount of deflection of the diaphragm 23 accompanying the pressure change in the pressure chamber 24 so that the shielding cylinder 37 changes the primary and secondary coils 30 and 31. Inserted between.

  According to such a pressure detector 12, the amount of insertion of the shielding cylinder 37 between the primary and secondary coils 30 and 31 changes as the pressure in the pressure chamber 24 changes, and accordingly Since the shielding amount of the magnetic field lines generated in the primary coil 30 by the shielding cylinder 37 changes and the generated voltage of the secondary coil 31 changes according to the change of the shielding amount of the magnetic field lines, the generated voltage of the secondary coil 31 is detected. It becomes possible to detect the pressure in the pressure chamber 24, that is, in the detection tube 2. Thus, the pressure detector 12 outputs a signal that increases proportionally as the pressure in the detection tube 2 increases, and the liquid level gauge 21 displays the liquid level corresponding to the pressure in the detection tube 2. Is displayed.

  Next, the operation of the first embodiment will be described. The detection tube 2 is inserted into the well 1 so that the tip portion is immersed in the liquid in the well 1, and the conduit 4 connected to the nitrogen cylinder 3 is connected to the conduit 6. When the pressurized nitrogen gas is supplied from the nitrogen cylinder 3 in a state where the three-way valve 5 is switched so as to be disconnected from the bypass duct 10, the pressurized nitrogen gas is throttled by the throttle 7. Nitrogen gas is constantly supplied to the detection tube 2, and a small amount of nitrogen gas is bubbled from the tip of the detection tube 2 at all times. Moreover, a pressure detector 12 that detects the pressure in the detection tube 2 is connected to the detection tube 2.

  In such a state that a small amount of nitrogen gas is constantly supplied and a small amount of the supplied nitrogen gas leaks out, the pressure in the detection tube 2 is the water head from the tip of the detection tube 2 to the liquid level L. The value corresponds to the pressure. Therefore, by detecting the pressure in the detection tube 2 with the pressure detector 12, the water head pressure, that is, the pressure corresponding to the liquid level L can be detected, and the liquid level L corresponding to the detection value of the pressure detector 12 is It can be accurately obtained with the surface meter 21.

  Moreover, since a small amount of nitrogen gas is always supplied into the detection tube 2, the volume of the nitrogen gas in the detection tube 2 does not change greatly even if the environmental temperature changes. The liquid level L can be detected with high accuracy. Further, since the amount of nitrogen gas supplied to the detection tube 2 is small, the nitrogen cylinder 3 can be downsized.

  Further, only the detection tube 2 made of a material having heat resistance and corrosion resistance is inserted into the well 1, and sufficient durability can be obtained even in a high temperature atmosphere where corrosive gas exists in the well 1. Can be secured.

  Further, when the three-way valve 5 is switched so that the pipe line 4 communicates with the detour pipe line 10 and is cut off from the pipe line 6, a relatively large amount of nitrogen gas can be supplied into the detection pipe 2. It is possible to shorten the time required for the pressure in 2 to be a value corresponding to the water head pressure, and to quickly detect the liquid level L at the start of detection.

  Furthermore, depending on the depth of the well 1, the pressure required in the nitrogen cylinder 3 changes. When the well 1 is deep, a relatively large amount of nitrogen gas is supplied to the detection tube 2 with the nitrogen cylinder 3. The required pressure is inevitably high, but in order to supply such a small amount of nitrogen gas to the detection tube 2 by sufficiently throttling such high-pressure nitrogen gas with the throttling 7, the hole diameter is reduced with a throttling with a small hole diameter. However, processing is difficult, but the narrow tube is wound into a coil shape, so that the aperture 7 is configured. Therefore, processing is easy, and the length of the narrow tube can be changed to reduce the degree of drawing. Since it can be changed, it is possible to easily cope with a change in the depth of the well 1.

  FIG. 3 shows a second embodiment of the present invention. The parts corresponding to the first embodiment are indicated by the same reference numerals, and the detailed description is omitted.

  In order to detect the liquid level L in the well 1, the detection tube 2 is inserted to the position where the tip of the detection tube 2 is close to the bottom 1a of the well 1, and the tip of the detection tube 2 is immersed in hot water. A nitrogen cylinder 3 is connected to the detection pipe 2 via a pipe 4, a pipe 6, a throttle 7, a pipe 8 and a T-shaped pipe joint 9. Further, the pipe line 4 passes through the bypass pipe 35, the T-shaped pipe joint 11, and the pipe joint 9 that can bypass the throttle 7 and guide the pressurized nitrogen gas from the nitrogen cylinder 3 to the detection pipe 2. And a pressure detector 12 is connected to the pipe joint 11. In addition, the bypass pipe 35 is provided with an electromagnetic on-off valve 36 as a switching valve for switching the flow of pressurized nitrogen gas from the nitrogen cylinder 3 to the bypass pipe 35.

  Thus, when the electromagnetic on-off valve 36 is closed, the pressurized nitrogen gas from the nitrogen cylinder 3 is constantly throttled by the throttle 7 and supplied to the detection tube 2, and a small amount is supplied from the tip of the detection tube 2. Nitrogen gas is constantly bubbled out. When the electromagnetic opening / closing valve 36 is opened, nitrogen gas from the pipe 4 flows through the bypass pipe 35, and a relatively large amount of nitrogen gas can be supplied into the detection pipe 2.

  The same effects as those of the first embodiment can be obtained by the second embodiment.

  FIG. 4 shows a third embodiment of the present invention. The parts corresponding to the first and second embodiments are indicated by the same reference numerals, and detailed description thereof is omitted.

  A nitrogen cylinder 3 is connected to the detection pipe 2 through a pipe 4, a three-way valve 5, a pipe 6, a throttle 7, a pipe 8 and a T-shaped pipe joint 9, and the three-way valve 5 is connected to the throttle 7. Is connected to the detection pipe 2 via a bypass pipe 10, a T-shaped pipe joint 11 and the pipe joint 9, which can guide the pressurized nitrogen gas from the nitrogen cylinder 3 to the detection pipe 2. An electromagnetic opening / closing valve 37 is interposed in the path 10.

  The valve opening timing and valve opening time of the electromagnetic opening / closing valve 37 are set by a timer 38 disposed in the control panel 39 together with the liquid level gauge 21 connected to the pressure detector 12.

  According to the third embodiment, when a pressurized gas of high pressure is necessary because the well 1 is deep, a pressurized gas cylinder such as a nitrogen cylinder 3 must be used as a pressurized gas supply source. In normal times, only when the electromagnetic on-off valve 37 is opened, the pressurized nitrogen gas is supplied from the nitrogen cylinder 3 through the bypass pipe 10 into the detection pipe 2 to reduce the consumption of nitrogen gas. Further, when the nitrogen cylinder 3 is replaced, a small amount of pressurized nitrogen gas whose flow rate is reduced by the restrictor 7 is supplied to the detection tube 2, whereby supply of the pressurized nitrogen gas to the detection tube 2 is stopped. Hot water that has entered the detection tube 2 can be removed from the detection tube 2.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

  For example, although the case where the liquid level of the hot spring well is detected has been described in the above embodiment, the present invention can be widely implemented as a detection device for detecting the liquid level of the well. Moreover, although the said Example demonstrated the case where pressurized nitrogen gas was used as pressurized gas, it is also possible to use other pressurized gas, such as pressurized air.

It is a figure which shows the structure of the liquid level detection apparatus of 1st Example. It is a longitudinal cross-sectional view of a pressure detector. It is a figure which shows the structure of the liquid level detection apparatus of 2nd Example. It is a figure which shows the structure of the liquid level detection apparatus of 3rd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Well 2 ... Detection pipe 3 ... Nitrogen cylinder 5 which is a pressurized gas supply source ... Three-way valve which is a switching valve 7 ... Restriction 10, 35 ... Detour pipe line 12 ..Pressure detector 36 ... Electromagnetic on / off valve 37 as switching valve ... Electromagnetic on / off valve 38 ... Timer

Claims (2)

  A detection tube (2) inserted into the well (1) so that the tip is immersed in the liquid in the well (1), and sufficient for allowing gas to constantly leak from the tip of the detection tube (2). A pressurized gas supply source (3) capable of continuously supplying a pressurized gas of a pressure and an amount, a thin tube wound in a coil shape, and the detection tube (2) and the pressurized gas supply source (3 ) And a bypass pipe (7) that bypasses the throttle (7) and can guide the pressurized gas from the pressurized gas supply source (3) to the detection pipe (2). 10, 35), a switching valve (5, 36) for switching the flow of pressurized gas from the pressurized gas supply source (3) to the bypass pipe (10, 35), and the detection pipe ( 2) a well having a pressure detector (12) connected to the detection pipe (2) so as to detect the pressure in the well. Liquid level detecting device.   The liquid level of the well according to claim 1, wherein an electromagnetic on-off valve (37) in which a valve opening time and a valve opening time are set by a timer (38) is interposed in the bypass pipe (10). Detection device.

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