JP4553160B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device for pumping liquid to a predetermined device while separating bubbles collected in a fluid pumped by a pump and collecting them in a separation chamber, and more specifically, a mixing amount for detecting a gas mixing amount The present invention relates to a detection device.

  Gas stations handle volatile liquids such as gasoline and light oil, and the refueling equipment used during refueling is a pump that pumps liquid, a gas-liquid separation mechanism that separates bubbles mixed in the liquid, and separation A float chamber for storing the liquid and a float valve for returning to the pump side when the separated liquid reaches a predetermined amount are provided.

As a gas-liquid separation mechanism used for this kind of application, for example, it has a bottomed cylindrical shape arranged horizontally, a small hole is provided at the center of the bottom, and the inner peripheral surface of the cylindrical body has a tangential direction. What was comprised so that a fluid may flow in is used (for example, refer patent document 1). The fluid flowing into the gas-liquid separation mechanism swirls in a spiral shape, and is separated into a component having as few bubbles as possible and a component containing as many bubbles as possible by centrifugal force. A liquid containing a large amount of gas flows into the float chamber from the small hole at the bottom, the gas is released to the atmosphere from the atmosphere communication hole at the top of the float chamber, and the liquid again passes through the return channel provided at the bottom of the float chamber. Returned to the pump. The component having as few bubbles as possible separated by the gas-liquid separation mechanism is discharged from the outlet.
JP 61-54212 A

However, when a large amount of bubbles are mixed in the fuel oil, the conventional gas-liquid separation mechanism may not be able to completely discharge the bubbles from the small holes to the separation chamber. At this time, the fuel oil discharged from the pump device is mixed with bubbles that could not be discharged into the separation chamber. The oil could not be measured accurately.
The present invention has been made in view of such circumstances, and it is a main object of the present invention to provide a pump device that can reliably separate a liquid and a gas even when a large amount of bubbles are mixed.

The invention according to claim 1 of the present invention is provided with a pump for pressurizing the fluid sucked from the inflow conduit, and a separation hole provided at the center of the end portion of the pipe closed at both ends. A gas-liquid separation mechanism for separating the liquid into gas and liquid, a separation chamber for separating the liquid recovered by the pump from the fluid discharged from the separation hole, and a flow path from the separation chamber to the suction port of the pump. In the pump device including a float valve that opens and closes, the gas-liquid separation mechanism is provided with a connection port through which the pressurized fluid flows at one end of the pipe, and the gas-liquid separation at the other end of the pipe. An outflow port for discharging a fluid containing a large amount of liquid after being separated, and a mixing amount detection device for detecting the amount of gas contained in the fluid flowing into the gas-liquid separation mechanism. Is the separation chamber from the separation hole An ejector through which the fluid to be discharged flows, a pressure sensor for detecting a negative pressure generated in the ejector when the fluid is ejected from the ejector, and an amount of gas contained in the fluid is increased and ejected from the ejector A valve for reducing the flow area of the outflow pipe connected to the outlet when the amount of liquid to be reduced decreases and the negative pressure in the ejector detected by the pressure sensor falls below a predetermined value It was set as the pump apparatus characterized by having.

According to a second aspect of the present invention, in the pump device according to the first aspect, an outflow hole is provided at an end of the pipe on the side into which the fluid flows, and the fluid containing a large amount of liquid flows out after the gas-liquid is separated. The pump device according to claim 1, wherein the separation hole is provided at a side end portion.

  The invention according to claim 3 is the pump device according to claim 1, wherein the ejector is arranged in the pipe, and a diffuser of the ejector is connected to the separation hole.

  According to a fourth aspect of the present invention, in the pump device according to the second or third aspect, a swivel stopper is provided in parallel to the axis at the inlet of the ejector.

  The invention according to claim 5 is the pump device according to claim 1, wherein the ejector is provided in a pipe connecting the separation hole and the separation chamber.

  According to a sixth aspect of the present invention, in the pump device according to the fifth aspect, the separation hole is provided at an end portion on the outflow side of the fluid flowing into the pipe.

  The invention according to claim 7 is the pump device according to claim 5, wherein the separation hole is provided at an end portion on an inflow side of the fluid flowing into the pipe.

  The invention according to claim 8 is the pump device according to any one of claims 1 to 7, wherein the pressure sensor includes a first chamber communicating with the separation chamber and a second chamber communicating with the ejector. The chamber is partitioned by a diaphragm, and has a detection element for detecting movement of the diaphragm.

  According to the present invention, the fluid discharged into the separation chamber is passed through the ejector to form a high-speed flow, and the gas mixing amount is measured by detecting the negative pressure generated at this time. Can be reliably measured. The fluid is not discharged in a state where the amount of mixed gas is large. According to the second aspect of the invention, the separated air is mainly discharged from the second separation hole, so that it is possible to easily cope with fluctuations in the air mixing amount.

  The best mode for carrying out the present invention will be described in detail with reference to the drawings. Note that, in each embodiment, the same components are denoted by the same reference numerals. In addition, a description overlapping in each embodiment is omitted.

(First embodiment)
FIG. 1 shows a cross-sectional view of a pump device according to the present embodiment. The pump device 1 is provided with an inflow conduit 3 connected to a fuel oil (fluid) tank 2 and an outflow conduit 4 connected to a fuel supply device or the like. The inflow conduit 3 is connected to the suction port of the pump 5. The pump 5 has a mechanism for pressurizing the fuel oil to a predetermined pressure, and its discharge port is connected to the connection port 7A of the gas-liquid separation mechanism 7 via the liquid path 6. The gas-liquid separation mechanism 7 has a pipe 8 arranged horizontally, and both ends of the pipe 8 are closed. As shown in FIG. 2, the liquid passage 6 is connected to the connection port 7 </ b> A side, that is, the vicinity of one end on the inflow side so that the fuel oil flows in the tangential direction of the inner peripheral surface of the pipe 21. A separation hole 9 is formed at the center of the other end of the pipe 8, and a fluid containing as much gas as possible is separated by using centrifugal force, and the separation hole 9 passes through the pipe 10. It leads to the separation chamber 11. The pipe 8 near the other end is formed with an outlet 7B for discharging a fluid containing a large amount of fuel oil after separation, and the outlet 7B is connected to the outlet pipe 4.

  The separation chamber 11 is a space for temporarily retaining the fluid that is slightly mixed with the gas discharged from the gas-liquid separation mechanism 7 and separating the gas and the liquid in the fluid by gravity or buoyancy. In the upper part of the separation chamber 11, a conduit 12 for releasing the separated air, and when the liquid level in the separation chamber 11 exceeds a predetermined value, the conduit 12 is closed to prevent fuel oil from leaking outside. There is a valve 13 to prevent. A float valve 14 is provided on the bottom side of the separation chamber 11, and the opening and closing of the return channel 15 extending from the separation chamber 11 to the inflow conduit 3 is controlled by the float valve 14.

Here, the pump device 1 according to the present embodiment is provided with a mixing amount detection device 21 that detects the mixing amount of air in the fuel oil from the amount of fluid flowing into the separation chamber 11.
The mixing amount detection device 21 is provided in the gas-liquid separation mechanism 7, and includes an ejector 22 that is a negative pressure generating portion fixed to the other end (outflow end) side of the pipe 8, and an outside of the gas-liquid separation mechanism 7. And a pressure sensor 23 connected to the ejector 22 by a pipe 28.
The ejector 22 is disposed coaxially with the pipe 8 and is arranged on the upstream (inflow) side, a mixing unit 26 into which a high-speed flow (jet flow) fluid formed by the nozzle 25 flows, and a mixing unit 26. A diffuser 27 that increases the pressure of the fluid that has passed through the diffuser 27, and the diffuser 27 communicates with the separation hole 9.

  The pressure sensor 23 has a housing 29, and a space in the housing 29 is divided into upper and lower portions by a diaphragm 30. The lower first chamber 31 is connected to the upper portion of the separation chamber 11 by a pipe 32, and the internal pressure P1 of the first chamber 31 and the internal pressure of the separation chamber 11 are substantially the same pressure. The upper second chamber 33 is communicated with the mixing chamber 26 of the ejector 22 by the pipe 28, and the internal pressure P2 of the second chamber 33 and the internal pressure of the mixing chamber 26 are substantially the same pressure. The outer periphery of the diaphragm 30 is fixed to the housing 29, and is pressed downward by a coil spring 35. A rod 36 is fixed to the center. The rod 36 extends upward, and a magnet 37 is fixed to the upper portion thereof. A non-contact type proximity switch 38 (detecting element) is attached to the upper portion of the housing 29, and is configured to output an ON / OFF signal when the magnet 37 is contacted or separated. The signal output of the proximity switch 38 is electrically connected to the control device 40 of the control valve 39 provided in the outflow pipe 4.

Next, the operation of the pump device 1 will be described.
In the initial stage, the internal pressure P1 of the first chamber 31 and the internal pressure P2 of the second chamber 33 of the pressure sensor 23 are substantially equal, and the diaphragm 30 is in an initial position where the weight of the diaphragm 30 and the force received from the coil spring 35 are balanced. At this time, the position of the magnet 37 is lower than the detection range of the proximity switch 38, and the proximity switch 38 outputs an OFF signal. It is assumed that the control valve 39 is closed in this state.

  The fuel oil is supplied from the tank 2 through the inflow conduit 3 to the pump device 1 and pressurized by the pump 5. The fuel oil discharged from the pump 5 flows into the gas-liquid separation mechanism 7 from the liquid pipe 6. In the gas-liquid separation mechanism 7, fuel oil and air mixed as bubbles are separated by the action of centrifugal force. The fuel oil is mainly discharged from the downstream end through the inner peripheral surface of the pipe 8 of the gas-liquid separation mechanism 7 and supplied to a fuel nozzle (not shown) through the control pipe 39 from the outflow pipe 4. Is done.

  On the other hand, in the gas-liquid separation mechanism 7, the component containing as much bubbles as possible is separated into the central portion of the pipe 8. This separated fluid flows into the nozzle 25 of the ejector 22. The separated fluid is jetted into the mixing chamber 26 as a high-speed flow by the nozzle 25, mixed with the fluid in the mixing chamber 26, and then guided to the separation chamber 11 from the separation hole 9 through the diffuser 27. In the separation chamber 11, the valve 13 is normally open and is activated and closed only when the liquid level in the separation chamber 11 exceeds a predetermined level. On the other hand, fuel oil, which is a liquid component stored in the separation chamber 11, accumulates at the bottom of the separation chamber 11. When the liquid level in the separation chamber 11 rises, the fuel oil accumulated by opening the float valve 14 is returned from the return flow path 15 to the inflow conduit 3 and is pressurized again by the pump 5.

  Here, when the separated fluid is discharged to the separation chamber 11 through the ejector 22, a negative pressure is generated in the mixing chamber 26 due to the high-speed flow of the separated fluid. As a result, the fluid in the second chamber 33 connected to the mixing chamber 26 via the pipe 28 is sucked into the mixing chamber 26. Since the second chamber 33 is a sealed space, the inside of the second chamber 33 is depressurized, and its internal pressure P2 is relatively lower than the internal pressure P1 of the first chamber 31. As a result, the balance of the force that supported the diaphragm 30 at the initial position is lost, and the diaphragm 30 is deformed so as to protrude toward the second chamber 33. Along with this, the positions of the rod 36 and the magnet 37 rise.

  When the amount of bubbles contained in the fuel oil flowing into the gas-liquid separation mechanism 7 is small, the liquid ejected from the nozzle 25 of the ejector 22 occupies most of the fluid, so the amount of liquid increases. In this case, since the negative pressure generated in the mixing chamber 26, that is, the amount of pressure reduction in the second chamber 33 is increased, the differential pressure between the first chamber 31 and the second chamber 33 is increased. As a result, as shown in FIG. 3, the diaphragm 30 is greatly deformed toward the second chamber 33, and the magnet 37 attached to the upper end of the rod 36 is raised to the detection range of the proximity switch 38. The output of the proximity switch 38 is turned ON, the control valve 39 is opened, and the fuel oil flowing out from the gas-liquid separation mechanism 7 is discharged through the outflow pipe 4 as it is.

  In contrast, when the amount of bubbles contained in the fuel oil flowing into the gas-liquid separation mechanism 7 increases, the fluid ejected from the nozzle 25 of the ejector 22 occupies most of the fluid, and the amount of liquid passing through the ejector 22 Decrease. In this case, the negative pressure generated in the mixing chamber 26, that is, the amount of pressure reduction in the second chamber 33 becomes small, and the differential pressure between the first chamber 31 and the second chamber 33 decreases. When the amount of bubbles exceeds a preset amount, the negative pressure generated in the mixing chamber 26 of the ejector 22, that is, the differential pressure between the first chamber 31 and the second chamber 33 falls below a predetermined value. As a result, the diaphragm 30 returns to the first chamber 31, that is, the initial position due to its own weight and the force received from the coil spring 35, and the magnet 37 is lowered to a range that cannot be detected by the proximity switch 38 as shown in FIG. Turns off. As a result, the control valve 39 is closed, and the fuel oil discharge with a large amount of bubbles is stopped.

  As described above, in this pump device 1, the mixing amount detection device 21 is provided, and bubbles are mixed using the difference between the pressure change caused by the amount of bubbles in the mixing chamber 26 of the ejector 22 and the pressure in the separation chamber 11. Since the amount is measured, the amount of bubbles can be reliably detected with a simple configuration, and fuel oil with a large amount of bubbles can be prevented from being discharged. For this reason, it becomes possible to accurately measure the amount of fuel oil supplied.

In addition, when the mixing amount detection device 21 detects a predetermined pressure difference, the fuel oil discharged through the outflow pipe 4 with the opening degree of the control valve 39 reduced instead of fully closing the control valve 39 The amount of can be reduced. Since the internal pressure of the flow path in the pump device 1 increases, the separation efficiency of the fuel oil and bubbles in the gas-liquid separation mechanism 7 is improved, and the amount of bubbles in the fuel oil flowing through the outflow pipe 4 is reduced. When the throttle control of the control valve 39 is performed in this way, it is possible to continue refueling without stopping the discharge even when the amount of bubbles mixed in is large.
The pressure sensor 23 may be a known pressure sensor that measures the negative pressure generated in the mixing chamber 26 of the ejector 22 instead of detecting the difference between the pressure of the mixing chamber 26 of the ejector 22 and the pressure of the separation chamber 11.

Here, the modification of the mixing amount detection apparatus 21 of the pump apparatus 1 which concerns on this embodiment is shown in FIG.4 and FIG.5.
In the pump device 1 shown in FIG. 4, an ejector 22 of the mixing amount detection device 21 is disposed in a pipe 10 that connects the separation hole 9 and the separation chamber 11. A pipe 28 connected to the mixing chamber 26 of the ejector 22 is connected to a second chamber 33 of the pressure sensor 23 shown in FIG. Further, a cylinder 43 serving as a guide for promoting the separation of gas and liquid is fixed to the end 8A on the downstream (outflow) side of the pipe 8 of the gas-liquid separation mechanism 7 so as to be coaxial with the pipe 8. Yes. The operation and effect of the pump device 1 are the same as described above.

  In the pump device 1 shown in FIG. 5, a separation hole 9 is formed in the upstream end 8 </ b> B of the gas-liquid separation mechanism 7. Furthermore, the ejector 22 of the mixing amount detection device 21 is provided in a pipe 10 that connects the separation hole 9 and the separation chamber 11 provided on the upstream side. A pipe 28 connected to the mixing chamber 26 of the ejector 22 is connected to a second chamber 33 of the pressure sensor 23 shown in FIG. In the pump device 1, the separated fluid is discharged from the separation hole 9 on the upstream side of the pipe 8. The amount of the separated fluid is detected by the mixing amount detection device 21 according to the amount of fluid passing through the pipe 10.

(Second Embodiment)
As shown in FIG. 6, the pump device 1 according to this embodiment has the gas-liquid separation mechanism 7 accommodated in the separation chamber 21, and the amount of fluid containing a large amount of air separated by the gas-liquid separation mechanism 7 is obtained. It has a mixed amount detection device 51 for detection. In the pump device 1, the separation hole 9 of the gas-liquid separation mechanism 7 communicates directly with the separation chamber 11.

  The mixing amount detection device 51 includes an ejector 22 attached to a downstream end in the pipe 8 of the gas-liquid separation mechanism 7 and a pressure sensor 52 disposed outside the gas-liquid separation mechanism 7. A swivel stopper 53 is attached to the inlet side of the nozzle 25 of the ejector 22. As shown in FIG. 7, the swivel stopper 53 is formed by integrally forming a cross-shaped partition plate 55 on a cylinder 54.

The pressure sensor 52 includes a lower housing 61 and an upper housing 62 that are integrally formed on the upper wall of the separation chamber 11, and a diaphragm 63 is sandwiched between the housings 61 and 62. An internal space of the housing 65 formed by the two housings 61 and 62 is divided into a lower first chamber 66 and an upper second chamber 67 by a diaphragm 63. The lower first chamber 66 is communicated with the separation chamber 11 through the communication hole 68, and the internal pressure P <b> 1 of the first chamber 66 is substantially equal to the internal pressure of the separation chamber 11. The upper second chamber 67 is communicated with the mixing chamber 26 of the ejector 22 through a pipe 69, and the internal pressure P <b> 2 of the second chamber 67 is substantially equal to the internal pressure of the mixing chamber 26.
A pusher 73 that contacts the upper surface of the diaphragm 63 is disposed in the second chamber 67. In the pusher 73, the rod 72 extends upward from the plate 71, and the plate 71 is always pressed against the diaphragm 63 by being biased downward by the coil spring 73. The rod 72 is inserted into a guide 62 </ b> A recessed in the upper part of the housing 65, and a magnet 37 is fixed to the upper part of the rod 72. A proximity switch 38 is fixed outside the guide 62A. The magnet 37 is arranged to be below the detection range of the proximity switch 38 when the internal pressures of the first chamber 66 and the second chamber 67 are substantially equal.

The operation of this embodiment will be described.
In the gas-liquid separation mechanism 7, fuel oil and air are separated by the action of centrifugal force. The separated fluid having as much air as possible flows into the swivel stop 53 of the ejector 22 as a swirl flow. Since the swivel stopper 53 is formed in a lattice shape by the partition plate 55, the flow of fluid in the swivel direction is limited. As a result, the fluid flowing through the nozzle 25 becomes a flow close to a linear flow.

  When the amount of bubbles contained in the fuel oil flowing into the gas-liquid separation mechanism 7 exceeds a preset amount, the negative pressure generated in the mixing chamber 26 of the ejector 22 decreases, and the first chamber 66 and the second chamber 67. The differential pressure is less than a predetermined value. As a result, as shown in FIG. 6, the magnet 37 moves down to a range where the proximity switch 38 cannot detect, and the output of the proximity switch 38 is turned off. As a result, the control valve 39 is closed, and fuel oil with a large amount of bubbles mixed therein is prevented from being discharged.

(Third embodiment)
As shown in FIG. 9, the pump device 1 according to this embodiment includes a gas-liquid separation mechanism 81 that separates air in fuel oil, and a mixing amount detection device 21 that detects the mixing amount of air in fuel oil. Have
The gas-liquid separation mechanism 81 has the pipes 8 arranged horizontally, and both ends of the pipes 8 are covered with end portions. A second separation hole 82 is provided in the center of one end on the connection port 7A side, that is, the inflow side. The second separation hole 82 is connected to the separation chamber 11 by a pipe 83.
The mixing amount detection device 21 includes an ejector 22 disposed coaxially with the pipe 8 of the gas-liquid separation mechanism 7, and a pressure sensor 23 connected to the ejector 22 via a pipe 28. The diffuser 27 of the ejector 22 is connected to the outflow hole 82.

Next, the operation of the pump device 1 will be described.
The fuel oil discharged from the pump 5 flows into the gas-liquid separation mechanism 81 from the liquid pipe 6. In the gas-liquid separation mechanism 81, the fuel oil and the air mixed as bubbles are separated by the action of centrifugal force. The fuel oil is mainly discharged from the downstream end through the inner peripheral surface of the pipe 8 of the gas-liquid separation mechanism 81, and is supplied to the oil supply nozzle (not shown) while passing through the control valve 39 from the outflow pipe 4. Is done. On the other hand, in the gas-liquid separation mechanism 81, the component containing as much bubbles as possible is separated into the central portion of the pipe 8, and from the second separation hole 82 provided on the upstream side, that is, in the region close to the outlet 7A. It is discharged and guided to the separation chamber 11 through the pipe 83.

  Here, in the normal state, that is, when the amount of air mixed in the fuel oil is equal to or less than the amount (allowable amount) that can be separated and discharged by the gas-liquid separation mechanism 81, most of the separated air is second. The fuel oil which is a liquid flows into the ejector 22 on the downstream side. As a result, a negative pressure is generated in the mixing chamber 26 of the ejector 22 by the high-speed flow of the separated fluid. By generating a negative pressure in the mixing chamber 26, the inside of the second chamber 33 of the pressure sensor 23 is depressurized, and the internal pressure P <b> 2 is relatively lower than the internal pressure P <b> 1 of the first chamber 31. As a result, the balance of the force that supported the diaphragm 30 at the initial position is lost, and the diaphragm 30 is deformed so as to protrude toward the second chamber 33. Along with this, the positions of the rod 36 and the magnet 37 rise. The output of the proximity switch 38 is turned ON, the control valve 39 is opened, and the fuel oil flowing out from the gas-liquid separation mechanism 81 is discharged through the outflow pipe 4 as it is.

On the other hand, if the amount of air mixed in the fuel oil increases, the air cannot be exhausted from the second separation hole 82. The air that cannot be separated flows into the ejector 22 together with the liquid, and is discharged to the separation chamber 11 through the separation hole 9.
When the air mixing amount in the fuel oil further increases and exceeds the allowable amount of the gas-liquid separation mechanism 81, the fuel oil containing a large amount of air that could not be exhausted is discharged from the pump device 1. At this time, only air flows into the ejector 22, and the mixing amount detection device 21 is operated to stop the discharge of the fuel oil with a large amount of air mixing.

  That is, the air that could not be exhausted from the second separation hole 82 flows in the gas-liquid separation mechanism 81 through the vicinity of the center of the pipe 8 toward the downstream end, and therefore is disposed downstream. The amount of air in the fluid flowing into the ejector 22 increases. As a result, the mixing chamber 26 of the ejector 22 is hardly depressurized. As a result, as shown in FIG. 10, the diaphragm 30 moves to the first chamber 31 side by its own weight and the force received from the coil spring 35, and the output of the proximity switch 38 is turned off. As a result, the control valve 39 is closed and the discharge of the fuel oil with a large amount of mixed bubbles is stopped, and the amount of fuel oil supplied can be accurately measured.

Here, a configuration in which the second separation hole 82 is provided on the upstream side and a configuration in which air is discharged to the separation chamber only by the downstream outflow hole 9 will be compared.
In the configuration in which the second separation hole 82 is not provided on the upstream side, even when the air mixing amount is small, air is discharged to the separation chamber 11 through the ejector 22, so that the discharge of fuel oil is stopped even with a small air mixing amount. End up. For example, as shown by the line L1 in FIG. 11, in the configuration in which the second separation hole 82 is not provided on the upstream side, the negative pressure generated in the ejector 22 is ON of the pressure sensor 23 in a state where the air mixing amount is less than 50%. The boundary value C1 for switching between / OFF is reached. That is, the discharge of the fuel oil is stopped at a stage where the air mixing amount is less than 50%.

  On the other hand, in this embodiment, the second separation hole 82 is provided on the upstream side, and air is discharged (separated) in advance by the second separation hole 92, so that the air mixing amount is 50 as indicated by the line L2. It is possible to prevent the pressure sensor 23 from being activated until the value reaches%. Thus, by adjusting the diameter of the second separation hole 82, it is possible to easily cope with fluctuations in the amount of air mixed by the tank or the pump.

Furthermore, a modification of this embodiment will be described with reference to FIGS.
The pump device 1 shown in FIG. 12 is provided with a second separation hole 82 in the center of the upstream end of the pipe 8 of the gas-liquid separation mechanism 81. A separation hole 9 is provided in the center of the downstream end of the pipe 8, and the cylinder 43 is fixed so as to be coaxial with the pipe 8. The ejector 22 is provided in a pipe 10 that connects the separation hole 9 and the separation chamber 11. The operation and effect of the pump device 1 are the same as described above.
In the pump device 1 shown in FIG. 13, a gas-liquid separation mechanism 81 is provided in the separation chamber 11. A second separation hole 82 is provided in the center of the upstream end of the pipe 8. Further, a swivel stopper 53 is attached to the inlet of the ejector 22. The flow of the fluid in the swiveling direction is limited by the partition plate 55 of the swivel stopper 53, and the fluid flowing through the nozzle 25 becomes a flow close to a linear flow.

  In the pump device 1 shown in FIG. 14, a mounting hole 91 is provided at the center of the end portion on the inflow side of the gas-liquid separation mechanism 81, and a plug 92 is mounted in the mounting hole 91. The plug 92 is formed with a second separation hole 93 on the central axis of the pipe 8 for allowing the air in the pipe 8 to flow into the separation chamber 11. The plug 92 is replaceably attached to the mounting hole 91 by screw fitting or the like. For example, if the hole diameter of the plug 92 is set so that the pressure sensor 23 can be switched ON / OFF by the allowable amount of the gas-liquid separation mechanism 81, a separation characteristic as shown by a line L2 in FIG. Further, when the plug 92 having a small hole diameter is attached to the mounting hole 91, for example, as shown by a line L1 in FIG. 11, the ON / OFF of the pressure sensor 23 can be switched with an air mixing amount smaller than the allowable amount. When the plug 92 having a large hole diameter is attached to the mounting hole 83, it becomes possible to switch the pressure sensor 23 on and off with an air mixing amount larger than the allowable amount. Thus, by selecting the hole diameter of the plug 92, desired gas-liquid separation characteristics can be obtained.

It is sectional drawing which shows schematic structure of the pump apparatus which concerns on embodiment of this invention. It is sectional drawing along the II line | wire of FIG. It is the figure which the diaphragm deform | transformed and the proximity switch was set to ON. It is a figure which shows the modification of arrangement | positioning of a gas-liquid separation mechanism and an ejector. It is a figure which shows the modification of arrangement | positioning of a gas-liquid separation mechanism and an ejector. It is sectional drawing which shows the one part schematic structure of the pump apparatus which concerns on embodiment of this invention. It is sectional drawing along the II-II line of FIG. It is the figure which the diaphragm deform | transformed and the proximity switch was set to ON. It is sectional drawing which shows the one part schematic structure of the pump apparatus which concerns on embodiment of this invention. It is the figure which the diaphragm deform | transformed and the proximity switch was turned OFF. It is a figure which shows an example of the relationship between an air mixing amount and an ejector. It is a figure which shows the modification of arrangement | positioning of a gas-liquid separation mechanism and an ejector. It is a figure which shows the modification which a gas-liquid separation mechanism exists in a separation chamber. It is a figure which shows the modification which formed the isolation | separation hole in the plug which can be attached or detached to a pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump apparatus 3 Inflow pipe line 4 Outflow pipe line 7, 81 Gas-liquid separation mechanism 8 Pipe 9 Separation hole 10 Pipe line 11 Separation chamber 21 Separation detection device 22 Ejector 23, 61 Pressure sensor 26 Mixing chamber 30, 63 Diaphragm 31, 66 First chamber 33, 67 Second chamber 38 Proximity switch (detection element)
39 Control valve 53 Swivel stop 54 Partition plate 82 Outflow hole

Claims (8)

A pump for pressurizing fluid sucked from the inflow pipe, and a gas-liquid separation mechanism in which a separation hole is provided in the center of the end of the pipe closed at both ends, and the pressurized fluid is separated into gas and liquid by centrifugal force; A pump device including a separation chamber for separating the liquid recovered by the pump from the fluid discharged from the separation hole, and a float valve for opening and closing a flow path from the separation chamber to the suction port of the pump;
The gas-liquid separation mechanism is provided with a connection port through which a pressurized fluid flows at one end of the pipe, and a fluid containing a large amount of liquid after separating the gas-liquid at the other end of the pipe. An outlet for discharging is provided, and a mixing amount detection device for detecting the amount of gas contained in the fluid flowing into the gas-liquid separation mechanism is provided , and the mixing amount detection device is discharged from the separation hole to the separation chamber. An ejector through which a fluid flows, a pressure sensor for detecting a negative pressure generated in the ejector when the fluid is ejected from the ejector, and an amount of gas contained in the fluid is increased and ejected from the ejector A valve for reducing the flow area of the outflow pipe connected to the outlet when the amount of liquid decreases and the negative pressure in the ejector detected by the pressure sensor falls below a predetermined value. Features having Pump device that. Claims, characterized in that the fluid in the pipe is provided with outflow hole on the end of the side where the inflow fluid rich in liquid after separation of the gas-liquid is provided with the separation hole in the end portion of the side flowing The pump device according to 1.   The pump device according to claim 1, wherein the ejector is arranged in the pipe, and a diffuser of the ejector is connected to the separation hole.   The pump device according to claim 2 or 3, wherein a swivel stopper is provided in parallel with the axis at the inlet of the ejector. The pump device according to claim 1, wherein the ejector is provided in a pipe connecting the separation hole and the separation chamber. The pump device according to claim 5, wherein the separation hole is provided at an end portion on an outflow side of the fluid flowing into the pipe.   The pump device according to claim 5, wherein the separation hole is provided at an end portion on an inflow side of a fluid flowing into the pipe.   2. The pressure sensor includes a detection element that partitions a first chamber communicating with the separation chamber and a second chamber communicating with the ejector with a diaphragm, and detects movement of the diaphragm. The pump device according to claim 7.

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