JP3867984B2 - Pumping equipment - Google Patents

Description

  The present invention relates to a pumping device, and more particularly to a pumping device that achieves noise reduction and a reduction in the size of the device.

  There is a technology for lowering groundwater using a pumping device as a foundation for civil engineering and construction. As this type of pumping device, for example, in Patent Document 1, a casing pipe having a strainer portion is driven into the ground, and the inside of the casing pipe is evacuated and decompressed by a water head difference and a pressure reducing means, whereby the ground water is strained by a vacuum force. A vacuum deep well type pumping device that collects groundwater in the casing pipe through the section and pumps the groundwater in the pumping sink pipe with a pump that places the collected groundwater in the casing pipe is proposed. Has been.

However, in the vacuum deep well type pumping device of Patent Document 1, it is necessary to evacuate a large volume of air in order to depressurize the inside of the casing pipe, a large pump is required, and the required depressurization is set. There is a problem that it takes time until. In order to solve this problem, in Patent Document 2, a water collecting pipe having a relatively small internal capacity is provided in a casing pipe, a pumping pump is provided in the water collecting pipe, and the water collecting pipe is depressurized by a pressure reducing means. Has been proposed. According to Patent Document 2, it is only necessary to evacuate and depressurize the inside of the water collecting pipe. Therefore, it is possible to reduce the size of the vacuum bomb and shorten the time required to reduce the pressure.
JP 2000-27170 A JP 2003-239296 A

  As described above, Patent Document 2 uses a water collecting pipe to reduce the burden of evacuation by a vacuum pump, but noise due to a vacuum pump becomes a problem. In particular, the vacuum pump requires a cooling device for cooling, but the cooling water supplied to the cooling device is mixed in the exhaust when being evacuated by the vacuum pump. The cooling water generates a large void noise in the exhaust system, causing environmental noise. Cooling water for cooling the vacuum pump is supplied from a notch tank that collects groundwater pumped from the casing pipe. Cooling water piping must be provided up to the vacuum pump of each pumping device, which becomes an obstacle when trying to reduce the scale of the entire pumping device.

  Furthermore, in order to increase the pumping efficiency of groundwater by decompression in this type of vacuum deep well pumping device, it is preferable to remove the air contained in the groundwater, but conventionally, in order to remove such air However, it is difficult to improve pumping efficiency. Moreover, in order to raise the water level of the water collecting pipe in the casing pipe to a predetermined level, it is necessary to perform a pressure reducing operation until the atmospheric pressure difference between the atmospheric pressure around the water collecting pipe and the vacuum pressure of the water collecting pipe reaches a predetermined value. Considering the amount of air to be evacuated necessary for decompression and the operation time, there is a limit to the downsizing of the vacuum pump, and there is a limit to the reduction of power consumption for operating the vacuum pump.

  An object of the present invention is to provide a pumping device that can suppress noise and reduce the size of the device in a vacuum deep well pumping device. Another object of the present invention is to provide a pumping device that enables power saving in a vacuum pump.

  The present invention relates to a casing pipe embedded in the ground, a separator tank that is disposed in the casing pipe and absorbs groundwater from the lower end, a pumping pump disposed in the separator tank, and a vacuum that depressurizes the separator tank. A vacuum deep well type pumping device equipped with a pump, wherein the upper end of the casing pipe is provided with a cooling water tank for storing a part of the groundwater pumped by the pump, and the exhaust system of the vacuum pump is placed inside the casing pipe. It connects so that the cooling water of a cooling water tank may be supplied to the cooler of a vacuum pump.

  Here, it is preferable that a water supply hole for introducing groundwater into the casing pipe is opened at the lower end of the separator tank, and an air separation wall is provided along the inside of the water supply hole.

  According to the present invention, by discharging the exhaust of the vacuum pump into the casing pipe, noise generated in the exhaust system is confined in the casing pipe, and environmental noise is suppressed. In addition, the inside of the separator tank is depressurized by the vacuum pump, and the outside thereof is pressurized, and the groundwater level in the separator tank is raised by the pressure difference, and pumping by the pump is possible. Therefore, the amount of air to be evacuated can be dramatically reduced compared to the case where the entire inside of the casing pipe is evacuated, the time for decompression operation by the vacuum pump is shortened, and the power consumption when operating the vacuum pump is reduced. Is possible.

  On the other hand, the groundwater pumped up by the pump is stored in a cooling water tank formed integrally with the casing pipe, and the groundwater stored in the cooling water tank is supplied to a water cooler of the vacuum pump to cool the vacuum pump. Since the cooling water tank is formed as a part of the casing pipe, there is no need to install cooling water piping from the notch tank to each well even when the notch tank is shared by multiple wells. Further reduction in size can be realized, and cost reduction can be realized. Furthermore, by providing an air separation wall in the separator tank, air can be separated from the groundwater absorbed in the separator tank, and the pumping efficiency can be improved.

  Next, Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram of Example 1 configured as a vacuum deep well type pumping device. A casing pipe 10 made of a steel pipe having a cylindrical shape with a required diameter is driven into the well W drilled in the ground E in the depth direction. The casing pipe 10 may have a configuration in which a plurality of pipes having required dimensions in the length direction are connected in the cylinder axis direction. Further, a required area on the lower side of the casing pipe 10 is configured as a strainer portion 11, and here, a steel wire is wound in a spiral shape or a circular shape so as to form a gap at a required interval along the peripheral surface. It consists of a winding screen. The lower end portion of the strainer portion 11 is configured as a sand reservoir portion 12. In addition, gravel and other granular materials are filled between the outer periphery of the casing pipe 10 and the inner wall of the well W to form a filter layer 13. With this configuration, underground groundwater passes through the filter layer 13 and flows into the casing pipe 10 through the gaps in the strainer portion 12.

  A flange is provided at the upper end of the casing pipe 10, and a cooling water tank 14 formed of a short cylindrical container having the same diameter as the casing pipe 10 is integrally formed on the flange 101. As will be described later, cooling water for cooling the vacuum pump can be stored inside the tank 14. Here, of the flanges of the upper bottom plate 141 and the lower bottom plate 142 of the cooling water tank 14, the flange of the lower bottom plate 142 is connected to the flange 101 of the casing pipe 10 with a bolt or the like for integration. The cooling water tank 14 is actually provided with a filter or the like for removing foreign substances from the accumulated cooling water, but the illustration and description thereof are omitted here.

  Inside the casing pipe 10, a separator tank 15 in the shape of an upside-down cylindrical container with a lower part opened and an upper part closed is provided. And the pumping duct 20 is penetrated from the upper side of the said cooling water tank 14 toward the said cooling water tank 14 up and down, This pumping duct 20 is further extended toward the said inside of the said casing pipe 10, and the lower end thereof. The portion is extended to the inside of the separator tank 15. And the pumping pump 16 is connected to the lower end part of this pumping duct 20, and it is comprised so that the groundwater in the separator tank 15 can be pumped through the pumping duct 20. FIG. The upper end of the pumping duct 20 extends upward through the cooling water tank 15 and extends to a notch tank 17 installed in the vicinity of the well W. The groundwater pumped up by the pumping pump 16 is It can be stored inside the notch tank 17. A three-way valve 21 and a check valve 22 are disposed at the upper end of the pumping duct 20. A cooling water discharge duct 23 is branched at a position below the sleeve valve 21 at the upper end of the pumping duct 20, and the tip of the cooling water discharge duct 23 is open to the inside of the cooling water tank 14. Has been.

  Similarly, an intake hose 30 is penetrated along the pumping duct 20 from the upper side to the lower side of the cooling water tank 14, and the intake hose 30 is further extended downward in the casing pipe 10. The lower end portion is disposed inside the separator tank 15. An exhaust hose 40 is penetrated along the pumping duct 20 from the upper side to the lower side of the cooling water tank 14, and the lower end portion of the exhaust hose 40 is open to the upper part of the casing pipe 10. Yes.

  The intake hose 30 and the exhaust hose 40 are connected to a vacuum pump 18 disposed adjacent to the well W. The vacuum pump 18 is configured as a vacuum pump that is rotationally driven by a motor 19. The upper end of the intake hose 30 is connected to the vacuum suction port 181 of the vacuum pump 18, and the exhaust port 182 of the vacuum pump 18 is connected to the vacuum pump 18. The upper end of the exhaust hose 40 is connected. Although not shown in the drawing, the vacuum pump 18 is integrally provided with a water-cooling type cooler for cooling itself, and a cooling water supply duct 24 is connected to a cooling water supply port 183 of the cooler, and the cooling pump The water tank 14 has a communication opening.

  FIGS. 2A and 2B are a detailed plan view and a vertical sectional view of the cooling water tank 14. Here, a part of each of the above-described pumping duct 20, intake hose 30 and exhaust hose 40 is used as a cooling water tank. When the cooling water tank 14 is connected to the upper end portion of the casing pipe 10 and integrated, the duct and the hose are connected to other portions. That is, the cooling water tank 14 is composed of an upper bottom plate 141 and a lower bottom plate 142 so that the inside is liquid-tight. When the cooling water tank 14 is connected to the casing pipe 10, it is provided at the lower end of the pumping duct 20A. The flange 201 thus connected is connected to a pumping duct 20B, which will be described later, connected to the pumping pump 16. At the same time, a lower intake hose not shown in the figure connected to the inside of the separator tank 15 is connected to the lower end portion 302 of the intake hose 30. In addition, after the cooling water tank 14 is connected to the casing pipe 10, a duct not shown in the drawing connected to the notch tank 17 is connected to the upper end 202 of the pumping duct 20, and each of the intake hose 30 and the exhaust hose 40 is similarly connected. Ducts not shown in the figure connected to the vacuum suction port 181 and the exhaust port 182 of the vacuum pump 18 are connected to the upper end portions 301 and 401, respectively. Further, the cooling water discharge socket 203 provided in the pumping duct 20 and the cooling water discharge socket 204 provided in the upper bottom plate 141 of the cooling water tank 14 are connected by the cooling water discharge duct 23 as indicated by chain lines.

  Further, a vacuum gauge socket 501 and a control socket 601 are disposed on the upper bottom plate 141 of the cooling water tank 14, and the vacuum gauge 50 shown in FIG. A controller (not shown) for controlling the pumping pump 16 is connected to 601. The vacuum gauge socket 501 is provided with a vacuum gauge duct 502 penetrating the cooling water tank 14 up and down, and a vacuum gauge lower socket 503 is provided at a lower end portion of the vacuum gauge duct 502. A control cable 60 is connected to the control socket 601 so as to vertically penetrate the cooling water tank 14, and a control lower socket 602 is connected to a lower end portion of the control cable 60.

  3A and 3B are a plan view and a vertical sectional view of the separator tank 15, and an upper end portion of the pumping duct 20B connected to the pumping pump 16 is a lower end of the pumping duct 20A of the cooling water tank 14 by a flange 204. It is connected to the flange 201 of the part. A vacuum gauge socket 504, a control socket 604, and an intake hose socket 304 are disposed on the upper surface of the separator tank 15. A vacuum gauge lower socket 503 of the cooling water tank 14 is connected to the vacuum gauge socket 503 by a vacuum gauge duct not shown in the drawing. A control cable (not shown) is connected to the control socket 604 and the control lower socket 602 of the cooling water tank 14. The intake hose socket 304 is opened to communicate with the inside of the separator tank 15, and the intake hose socket 304 is connected to the lower end portion 302 of the intake hose 30 of the cooling water tank 14 by a lower intake hose not shown in the drawing. Is done.

  In the pumping device having the above configuration, when the casing pipe 10 is embedded in the well W as shown in FIG. 1, the lower opening of the separator tank 15 sinks below the surface of the groundwater. Then, the vacuum pump 18 is driven, and the air inside the separator tank 15 is sucked through the intake hose 30. As a result, the atmospheric pressure inside the separator tank 15 is gradually reduced, and the groundwater level inside the separator tank 15 rises due to the atmospheric pressure outside the separator tank 15, that is, the atmospheric pressure, and the pumping pump 16 sinks into the water. It becomes a state. Accordingly, the pumping pump 16 is driven to pump up the groundwater in the separator tank 15, pumped through the pumping duct 20, and stored in the notch tank 17. Along with the pumping by the pumping pump 16, the water level in the well is lowered from the periphery of the well. At this time, the decompression operation by the vacuum pump 18 only needs to suck in the air inside the separator tank 15 and decompress it, so that the intake capacity can be significantly reduced as compared with the case where the entire inside of the casing pipe 10 is evacuated. Thus, it is possible to shorten the time of the pressure reducing operation by the vacuum pump 18 and to reduce the total power consumption when the vacuum pump 18 is operated. In addition, the vacuum pump 18 can be downsized.

  At the same time, exhaust air generated by driving the vacuum pump 18 is exhausted from the exhaust port 182 through the exhaust hose 40 into the casing pipe 10. Cooling water is mixed in the exhaust gas, and a void noise is generated. However, since the exhaust gas is in the casing pipe 10, the void noise is confined in the casing pipe 10 and the pumping device is grounded. Noise in the environment can be suppressed. At the same time, the exhaust gas is exhausted into the casing pipe 10 so that the pressure inside the casing pipe 10, that is, the pressure outside the separator tank 15 is higher than the atmospheric pressure. As a result, the pressure difference between the pressure inside the separator tank 15 and the pressure outside the separator tank 15 reduced in pressure as described above is expanded, and the rise of the groundwater level in the separator tank 15 is promoted. That is, the effect of reducing the pressure in the separator tank by the vacuum pump 18 is enhanced, so that the load on the vacuum pump 18 is reduced correspondingly, and the power consumption can be further reduced.

  On the other hand, the groundwater pumped up by the pumping pump 16 is stored in the notch tank 17 through the pumping duct 20 as described above, but a part of the groundwater flowing through the pumping duct 20 is transferred to the cooling water tank 14 through the cooling water discharge duct 23. Can be stored. After the foreign water is removed from the groundwater stored in the cooling water tank 14 by a filter or the like, it is supplied to the cooler of the vacuum pump 18 through the cooling water supply duct 24 to cool the vacuum pump 18. Since the cooling water tank 14 for storing the cooling water is formed integrally with the casing pipe 10 in this way, even when the notch tank 17 is shared by a plurality of wells (pumping devices), a plurality of pumping waters are provided from the notch tank 17. There is no need to provide cooling water piping to the apparatus, and the scale of the apparatus can be reduced. Of course, as compared with the case where the notch tank 17 is provided in each of the individual pumping devices, the scale of the pumping device can be greatly reduced, and the cost can be reduced.

  4 is a perspective view of the lower end portion of the separator tank according to the second embodiment, and FIG. 5 is a longitudinal sectional view thereof. Components equivalent to those in FIGS. In the second embodiment, the separator tank 15 is closed at the bottom with a bottom plate 151, and a water supply hole 152 for introducing groundwater into the separator tank 15 is opened at the center of the bottom. A plurality of water supply holes 153 are also arranged in the circumferential direction on the peripheral surface of the lower end portion of the separator tank 15. On the other hand, inside the separator tank 15, a cylindrical air separation wall 154 is provided so as to face the plurality of water supply holes 153 having a smaller diameter than the separator tank 15. A plurality of water passage holes 155 are opened in the air separation wall 154 at positions shifted downward in the cylinder axis direction so as not to face the water absorption holes 153. The pumping pump 16 is disposed at a position closer to the upper part inside the air separation wall 154. The water passage hole 155 may be disposed at a position shifted in the circumferential direction with respect to the water absorption hole 153.

  Thus, by providing the air separation wall 155 that faces the inside of the water supply hole 153 provided at the lower end of the separator tank 15, the groundwater that has entered the separator tank 15 from each of the water supply holes 153 is opposed to the facing air. It collides with the outer peripheral surface of the separation wall 154 and a turbulent flow occurs. By this turbulent flow, the air contained in the groundwater becomes bubbles and is separated from the groundwater. The separated air is moved and separated upward through the gap between the separator tank 15 and the air separation wall 154 as indicated by the broken line in FIG. 5, and the groundwater moves to the inside of the air separation wall 154 through the water passage hole 155 of the air separation wall 154. Is done. Further, the groundwater that has entered the separator tank 15 through the water suction hole 152 on the bottom surface collides with the bottom surface of the pumping pump 16 to generate turbulent flow, and the separated air is moved and separated upward. As described above, since the groundwater that has entered the separator tank 15 is in a state where the air is separated and deaerated, the pressure difference from the atmosphere when the inside of the separator tank 15 is reduced by the vacuum pump 18 is more effective. As a result, the level of groundwater rises, and the pumping efficiency of the pump 16 is increased, which is advantageous for power saving.

  Further, in the configuration of the embodiment, the cooling water tank 14 has a configuration independent of the casing pipe 10 as shown in FIG. 2, and the separator tank 15 has a configuration independent of the casing pipe 10 as shown in FIG. In addition, if each subassembly is performed, the pumping device of the present invention can be easily realized by assembling the cooling water tank 14 and the separator tank 15 to the existing vacuum deep well pumping device. Further, when assembling, it is only necessary to connect to each other by a duct or a hose using each socket provided in the cooling water tank 14 or each socket provided in the separator tank 15, thereby simplifying the assembling work. It is also possible to do. Therefore, it is possible to construct a pumping device improved at low cost by using the assets of the existing pumping device.

1 is an overall cross-sectional view of a water pumping apparatus according to a first embodiment. It is the top view and vertical sectional view of a cooling water tank. It is the top view and vertical sectional view of the separator tank of Example 1. It is a perspective view of the lower end part of the separator tank of Example 2. It is sectional drawing of the lower end part of the separator tank of Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Casing pipe 11 Strainer part 13 Filter layer 14 Cooling water tank 15 Separator tank 16 Pumping pump 17 Notch tank 18 Vacuum pump 19 Motor 20 (20A, 20B) Pumping duct 30 Intake hose 40 Exhaust hose 152,153 Water supply hole 154 Air separation wall

Claims (2)

  A casing pipe embedded in the ground, a separator tank that is disposed in the casing pipe and absorbs groundwater from a lower end, a pumping pump disposed in the separator tank, and a vacuum pump that depressurizes the separator tank A vacuum deep well type pumping device comprising: a cooling water tank for storing a part of groundwater pumped by the pumping pump at an upper end portion of the casing pipe; and a discharge system of the vacuum pump serving as the casing pipe. The pumping device is characterized in that the cooling water of the cooling water tank is supplied to the cooler of the vacuum pump while communicating with the inside of the vacuum pump. The pumping water according to claim 1, wherein a water supply hole for guiding groundwater into a casing pipe and an air separation wall disposed along an inner side of the water supply hole are provided at a lower end portion of the separator tank. apparatus.

Images