JP2008069726A - Submerged pump device and discharge method of infiltrating water in seal chamber in submerged pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a submerged pump device and an infiltrating water discharge method discharging infiltrating water infiltrated in a seal chamber while keeping a submerged pump in water, simplifying work for discharging the infiltrating water and decreasing labor while reducing costs. <P>SOLUTION: The submerged pump device comprises a moisture detection means 21 for detecting a moisture amount in the seal chamber 20, an oil supply tank 24 for supplying oil to the seal chamber 20 through a supply pile 23, and a drain path 25 connected to the bottom of the seal chamber 20. When a control means 34 is provided for performing water drain control of replenishing the oil of the oil supply tank 24 to the seal chamber 20 and draining accumulated water through the drain path 25, the height position of the maximum set liquid level is set in a state lower than the height position of an oil outlet 24a of the oil supply tank 24 more than a value obtained by multiplying the height of the oil outlet 24a relative to the seal chamber 20 by a difference in specific gravity between water and the lubrication oil and by dividing the multiplied height by the specific gravity of water so that forced push and displacement of moisture by the lubrication oil replenishment to the seal chamber 20 is performed by the gravitational force. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a submersible pump device and a method for entering and discharging a seal chamber of a submersible pump, and more particularly, to an impeller driven by a motor via a main shaft, and to the main shaft between the motor and the pump. The present invention relates to a submersible pump device having a seal chamber that houses a mechanical seal, and a method for entering and discharging a seal chamber of a submersible pump.

  In this type of submersible pump, the main shaft is equipped with a mechanical seal in order to prevent water from entering the motor, and the mechanical seal is enclosed in a mechanical seal chamber (hereinafter abbreviated as “seal chamber”). It is immersed in lubricating oil. Mechanical seals immersed in lubricating oil are intended to prevent moisture from entering the motor side, but due to the structure of the seal, it is unavoidable that moisture penetrates into the seal chamber slightly. Absent. Therefore, since moisture increases in the seal chamber as the usage time elapses, it is necessary to periodically pull up the submersible pump from the water, extract a part of the lubricating oil, and visually check it.

  The periodic inspection includes the work of lifting the submersible pump installed in the water above the surface of the water (or in addition to that work, moving the lifted submersible pump laterally to the maintenance work place) and confirming that the lubricating oil has been removed. This involves troublesome and troublesome work (or lubrication oil supply work). At this time, when an abnormality of the mechanical seal is suspected, operations such as disassembly of the submersible pump, replacement of parts, and reassembly are performed. Therefore, as disclosed in Patent Document 1, by providing moisture detection means such as a water immersion detector in the seal chamber, the moisture in the seal chamber becomes excessive while the submersible pump is installed without being pulled up. A technology has been developed that makes it possible to know what has happened. This eliminates the waste of pulling up the submersible pump for confirmation (regular inspection) regardless of whether there is an abnormality or not, and it is also possible to detect an abnormality in the mechanical seal at an early stage due to a significant increase in moisture. There is an advantage.

  In the submersible pump according to Patent Document 1, since it can be determined that an abnormality is detected when the detection value of the moisture detection means exceeds a predetermined value, the submersible pump is pulled out of the water immediately after the abnormality is detected, and then the seal chamber is disassembled. For example, it is necessary to remove the intruding water or to replenish the lubricating oil. Thus, although it is only necessary to pull up the submersible pump and perform inspection and maintenance when necessary, it is necessary to perform troublesome operations such as pulling up the submersible pump and replenishing lubricating oil.

Therefore, as disclosed in Patent Document 2, in addition to the inundation detector, it is connected to the open air pipe connected to the upper end of the seal chamber and the lower portion of the inundation detection tank formed on the upper side of the seal chamber. Technology has been developed to provide a water drain pipe and a pneumatic pipe connected to the lower end of the motor chamber. According to this technology, when the inundation detector is activated after being submerged, the air from the air compressor placed on the ground is supplied to the motor room through the intake pipe, and the submerged water is discharged to the ground through the drain pipe. Therefore, it is possible to perform a draining operation for discharging the intrusion water while keeping it installed in the water without pulling up the submersible pump.
JP 2006-97645 A JP-A 61-43295

  However, in the technique disclosed in Patent Document 2, in order to perform a draining operation for discharging water that has entered the seal chamber in a state where it is installed in water, an air compressor (compressor or the like) that is a drive source for that purpose is used. It must be prepared in the ground part, which increases the cost. Thus, with any of the techniques disclosed in any of the patent documents, there is still room for further improvement in terms of cost and maintenance workability regarding the discharge of water that has entered the seal chamber.

  The purpose of the present invention is to simplify the drainage operation as a drainage operation for discharging the water that has entered the seal chamber, which is an important functional part of the submersible pump, while it is still installed in the water without pulling up the submersible pump. The present invention is to provide a submersible pump device that can be realized while reducing the cost and cost of the conventional method. Another object of the present invention is to provide a method for entering and discharging the seal chamber of the submersible pump.

The invention according to claim 1 is a seal chamber that houses an impeller 3 driven by a motor 11 via a main shaft 8 and a mechanical seal 6 provided on the main shaft 8 between the motor 11 and the impeller 3. 20, moisture detection means 21 for detecting the amount of moisture in the seal chamber 20 or the ratio of moisture to the lubricant, and an oil tank 24 for replenishing lubricant via a supply pipe 23 connected to the seal chamber 20. And a submersible pump device having a discharge passage 25 connected to the bottom of the seal chamber 20,
The height position of the set maximum liquid level in the discharge passage 25 is higher than the height position of the oil outlet 24a of the oil supply tank 24. The specific gravity of water and lubricating oil is higher than the height of the oil outlet 24a with respect to the seal chamber 20. Multiplied by the difference and set to a state that is lower than the value divided by the specific gravity of water,
When the detection value by the moisture detecting means 21 reaches a predetermined value, the lubricating oil in the oil supply tank 24 is replenished to the seal chamber 20 by using gravity, so that the intruding water or water and lubricating oil accumulated in the bottom portion thereof. The control means 34 which performs draining control which discharges the mixture with these through the said discharge channel 25 is provided. The discharge path 25 is a general term for concepts including not only a discharge pipe but also a tank-like storage space.

  The invention according to claim 2 is the submersible pump device according to claim 1, wherein the seal chamber 20 can be connected to the atmosphere release path 27 communicating with the upper end portion thereof, and the atmosphere release path 27 can be intermittently connected. A switching valve 31 that is normally maintained in the closed position and an oil level detecting means 19 for detecting the oil level of the lubricating oil are provided, and the control means 34 is provided at the start of replenishment of lubricating oil to the seal chamber 20. When the oil level in the seal chamber 20 is lower than the set height position, the oil level in the seal chamber 20 is set to a set height by replenishing oil from the oil supply tank 24 from the detection of the low oil level. The valve is configured to perform air bleeding control for switching the switching valve 31 to the open position until it is raised to the vertical position.

  According to a third aspect of the present invention, in the submersible pump device according to the first or second aspect, the drainage passage 25 is provided with a drainage tank 26 capable of storing ingress water or lubricating oil discharged from the seal chamber 20. Therefore, the set maximum height position of the stored liquid level in the drainage tank 26 is higher than the height position of the oil outlet 24a in the oil supply tank 24 to the height of the oil outlet 24a with respect to the seal chamber 20. It is characterized in that it is set in a state where it is multiplied by the specific gravity difference between the oil and the lubricating oil and becomes lower than the value divided by the specific gravity of water.

  According to a fourth aspect of the present invention, in the submersible pump device according to the third aspect, the oil supply tank 24 and the drainage tank 26 are disposed above the water surface L of the water reservoir W where the submersible pump is buried. It is characterized by being.

According to a fifth aspect of the present invention, in the submersible pump device according to the second aspect, the drainage passage 25 is provided with a drainage tank 26 capable of storing ingress water or lubricating oil discharged from the seal chamber 20. In addition, the set maximum height position of the stored liquid level in the drainage tank 26 is higher than the height position of the oil outlet 24a in the oil supply tank 24 so that the oil outlet 24a is higher than the seal chamber 20 in water and lubrication. Multiply by the specific gravity difference with the oil, and set to a state that becomes lower than the value divided by the specific gravity of water,
The switching valve 31 has a first port p1 connected to the upper portion of the drainage tank 26, a second port p2 connected to the atmosphere opening path 27, and a third port p3 opened to the atmosphere. The first port p1 and the third port p3 are communicated, and the second port p2 is closed, the second port p2 and the third port p3 are communicated, and The first port p1 is configured as a three-way valve that can be freely switched to the closed second position.
The control means 34 is configured to switch the three-way valve 31 to the second position during the air bleeding control, and to switch the three-way valve 31 to the first position during the water draining control,
The tank facility T configured by arranging the oil supply tank 24 and the drainage tank 26 in this order from the top to the bottom is disposed above the water surface L of the water reservoir location W where the submersible pump is buried. It is a feature.

The invention according to claim 6 is a seal chamber that houses an impeller 3 driven by a motor 11 via a main shaft 8 and a mechanical seal 6 provided on the main shaft 8 between the motor 11 and the impeller 3. 20, moisture detection means 21 for detecting the amount of moisture in the seal chamber 20 or the ratio of moisture to the lubricant, and an oil tank 24 for replenishing lubricant via a supply pipe 23 connected to the seal chamber 20. And a method for entering and discharging the seal chamber of a submersible pump comprising a discharge passage 25 connected to the bottom of the seal chamber 20,
The specific gravity of water and lubricating oil is set such that the height position of the set maximum liquid level in the discharge passage 25 is higher than the height position of the oil outlet 24a of the oil supply tank 24 with respect to the seal chamber 20 of the oil outlet 24a. Multiply the difference and lower the value divided by the specific gravity of water, and when the detection value by the moisture detection means 21 reaches a predetermined value, the lubricating oil in the oil supply tank 24 is removed using gravity. By replenishing the seal chamber 20, intrusion water or a mixture of water and lubricating oil accumulated at the bottom of the seal chamber 20 is discharged through the discharge passage 25.

  According to the first aspect of the present invention, in accordance with the detection information indicating that the moisture detecting means has reached the limit allowable moisture amount, the lubricating oil in the oil tank is dropped and supplied to the seal chamber, thereby intruding water or water accumulated at the bottom of the seal chamber. Forcibly pushes and discharges the mixture of oil and lubricating oil through the discharge passage, so that the height position of the set maximum liquid level in the discharge passage is higher than the oil outlet height position of the oil supply tank. The height relative to the seal chamber is multiplied by the specific gravity difference between the water and the lubricating oil, and the height is set to be lower than the value divided by the specific gravity of the water. By making the oil outlet of the oil tank higher than the set maximum liquid level in the discharge path, water is pushed out of the seal chamber by the potential energy of the lubricating oil and forcedly removed, or in addition to that, it is moved upward and moved above the water surface. It can be discharged to the recovery unit.

  As a result, it is possible to discharge the water that has entered the seal chamber, which is an important functional part of the submersible pump, while keeping it installed in the water without pulling up the submersible pump. This can be realized while reducing the cost for the conventional method. In this case, an infrared oil moisture meter can be used as the moisture detection means.

  According to the second aspect of the present invention, if the valve is switched when necessary, the lubricating oil can be replenished to the seal chamber by potential energy and the intruding water can be discharged from the seal chamber simultaneously with the replenishment of the lubricating oil. In addition to being able to do so, the amount of lubricating oil can be restored to a prescribed amount by exhausting air from the atmosphere. In other words, with the submersible pump installed in the water without pulling up, not only the work of discharging the intrusion water from the seal chamber and the replenishment of the lubricating oil, but also the return of the lubricating oil to the specified amount, and at the same time, a dedicated drive source is used. There is an advantage that can be done without.

  According to the third aspect of the invention, the intrusion water discharged from the seal chamber can be collected in the drainage tank, and the wastewater treatment can be performed by the potential energy. According to the invention of claim 4, there is obtained an advantage that the effect of claim 3 can be obtained in a more convenient and easy-to-handle state by disposing the main part of the apparatus on the water surface.

  According to the invention of claim 5, the effect of the invention of claim 2 can be obtained, and a three-way valve responsible for venting the sealing chamber and discharging the intruding water and switching the oil supply to the sealing chamber is used. Since the drainage tank is located below and these tank facilities are located on the surface of the water, maintenance of the equipment on the surface of the water is facilitated, and the submersible pump device has the added effect of making the device compact. Can be provided.

  According to the sixth aspect of the present invention, it is possible to discharge the water that has entered the seal chamber using the potential energy while the submersible pump is installed in the water without pulling up the submersible pump. It is possible to provide a method for reducing the labor and realizing the cost for reducing the labor compared to the prior art.

  Hereinafter, embodiments of a draining device for a submersible pump according to the present invention will be described with reference to the drawings. 1 to 3 are sectional views of a submersible pump and a side view and a plan view showing the installation structure thereof, FIGS. 4 to 9 are a series of operational views showing the operation principle of a water draining device, and FIG. 10 is an axial flow type submersible pump. FIG. 11 is a water draining device of Example 2, and FIG. 12 is another structural diagram of tank equipment.

[Example 1]
The water draining device for the submersible pump according to the first embodiment is applied to a spiral submersible pump as shown in FIGS. The basic structure of the spiral submersible pump A is known per se, and as shown in FIG. 1, it is roughly divided into an upper motor part a, a lower pump part b, and a seal part c positioned between the upper and lower parts thereof. It consists of and.

  Briefly explaining the basic structure of the submersible pump A, 1 is a suction cover, 2 is a suction liner, 3 is an impeller, 4 is a casing (pump casing), 5 is a casing liner, 6 is a two-stage mechanical seal, and 7 is a mechanical seal. Ball bearing, 8 is main shaft, 9 is a cooling cylinder, 10 is a motor frame, 11 is a motor, 12 is a ball bearing, 13 is a terminal plate, 14 is an elbow pipe (discharge pipe), 15 is a guide fitting, 17 is a thermostat A guard, 18 is a cable, 19 is an oil level detecting means, and 21 is a moisture detecting means.

  As shown in FIGS. 2 and 3, an example of the usage situation of the submersible pump A is as follows. A stepped bottom wall 40 of a basin such as a sewage / sewage treatment tank or a dam reservoir has a pump pipe 41. The elbow pipe 14 located at the lower end is fixed, and the submersible pump A is locked and fixed by gravity by hooking the discharge port 42 to the opening 43 of the elbow pipe 14. That is, the guide fitting 15 protruding above the opening surface 4a having a shape that is obliquely cut out of the spiral casing 4 is dropped into the top of the elbow opening 43 from below to be hooked. The submersible pump A is locked and fixed in a state where the pump weight acts on the hook portion as a fulcrum and the casing opening surface 4a is pressed against the elbow opening surface 43a. ing.

  In addition, a pair of guide bars 44, 44 are erected on both sides of the elbow opening 43 so as to hang over a structure 45 on the water surface, and a pair of left and right recesses into which the guide bars 44, 44 are fitted. Semicircular portions 4 b and 4 b are integrally formed at the tip of the guide fitting 15. With such a configuration, when the submersible pump A is moved up and down by an elevator (not shown) using a chain or the like that is passed through the ring portions 22 and 22 formed integrally with the upper end of the submersible pump A, the guide bar 44 is used. , 44 and the recessed semicircular portions 4b, 4b can be switched between a use state locked and fixed to the elbow opening 43 and a maintenance state pulled up on the water surface. , And can be moved vertically up and down along the guide bars 44.

  Next, the water draining apparatus B that discharges intrusion water will be described. As shown in FIG. 1 and FIG. 4, the water draining device B replenishes the seal chamber 20 with the lubricating oil m using gravity (potential energy), thereby allowing the water that has entered the seal chamber 20 to accumulate. Extruding and discharging, water draining and lubricating oil replenishment can be achieved simultaneously. In the following, the structure, action, etc. will be described in detail.

  As shown in FIGS. 1 and 4, the seal chamber 20 which is a main element constituting the seal part c and filled with the lubricating oil m has an upper mechanical seal 6, a moisture detection means 21, and oil. Surface detection means 19 is provided. The moisture detection means 21 can detect the moisture amount in the seal chamber 20 or the ratio of the moisture amount to the lubricating oil, and here, a known infrared type moisture meter in oil is used as an example. The infrared-type moisture meter 21 in oil can measure and detect the amount of moisture contained in the lubricating oil m by processing an absorption spectrum by irradiation with infrared rays of a predetermined wavelength by spectroscopy (Fourier transform infrared spectroscopy). It is a moisture sensor that can. The oil level detecting means 19 for detecting the oil level of the lubricating oil in the seal chamber 20 is constituted by an oil level sensor.

  An oil supply tank 24 capable of replenishing the lubricating oil m via a supply pipe 23 connected to the seal chamber 20, and a drain tank 26 connected to the bottom of the seal chamber 20 via a discharge pipe (an example of a discharge path) 25. And a vent tank 28 connected to the upper end of the seal chamber 20 via an air release path 27, and an oil supply switching valve that can be intermittently connected to the atmosphere release path 27 and normally maintained in a closed position. 29 is provided. A vent switching valve 30 connected to the upper end of the fuel tank 24 for opening to the atmosphere and normally maintained in the open position, an upper end of the fuel tank 24, an upper end of the drain tank 26, and a vent tank 28 A three-way valve 31 connected to the drain, an artificially operated drain switching valve (drain open / close valve) 32 connected to the lower end of the drainage tank 26, and an artificially operated type connected to the upper part of the drainage tank 26. The air introduction switching valve (scavenging opening / closing valve) 33 is provided.

  The tank facility T configured by arranging the oil supply tank 24, the ventilation tank portion 28, and the drainage tank 26 in this order from the top to the bottom is located above the water surface L of the water reservoir portion W in which the submersible pump A is buried. Has been placed. In this case, it is advantageous if the five switching valves 29 to 33 are configured so as to be integrated into the tank facility T. Then, as shown in FIG. 4, the switching mechanism 29a of the switching valve 29 for refueling, the switching mechanism 30a of the switching valve 30 for ventilation, the switching mechanism 31a of the three-way valve 31, the oil level sensor 19, the moisture meter 21 in oil, etc. An electrically connected control device (an example of control means) 34 is provided. For convenience of drawing, in FIG. 4, the control device 34 is depicted as if it is disposed in water, but it is actually provided on the water surface.

  The three-way valve 31 includes a first port p1 connected to the upper part of the drainage tank 26, a second port p2 connected to the atmosphere opening path 27, an upper part of the fuel tank 24 and a normally open ventilation switching valve 30. And a third port p3 that is open to the atmosphere via the first port p1, the first port p1 and the third port p3 are in communication with each other, and the second port is closed at a first position (states of FIGS. 6, 7, and 8). The second port p2 and the third port p2 are communicated with each other, and the first port p1 is configured to be freely switched to the second position (the state shown in FIGS. 4, 5 and 9).

  Now, the water drain control means 37 and the air vent control means 38 by the control device 34 will be described. Initially, only the lubricating oil m is filled in the seal chamber 20, but a small amount of water from the mechanical seal 6 gradually accumulates in the seal chamber 20 in accordance with continuous use in water. In addition, the phenomenon in which the moisture accumulates in the seal chamber 20 may occur early due to damage to the mechanical seal 6. In any case, the intrusion water accumulated in the seal chamber 20 needs to be removed and restored to a state in which only an appropriate amount of lubricating oil is present before inconvenience occurs. It can be done almost automatically.

  First, FIG. 4 shows that when the submersible pump A is stopped (a state after a while after the stoppage), the moisture meter 21 in the oil indicates that the moisture (intrusion water) w has accumulated in the seal chamber 20 beyond the allowable level. The state at the time of positive detection is shown. In this stopped state, moisture accumulates at the bottom of the seal chamber 20, lubricant oil having a specific gravity lighter than water accumulates above it, and air (including other gases) accumulates above it, and the three-way valve 31 is The oil supply switch 24 is switched to the second position where the oil supply tank 24 and the ventilation tank portion 28 communicate with each other, and the oil supply switching valve 29 which has been in the closed position is changed to the open position in accordance with the detection operation of the moisture meter 21 in oil. . The ventilation switching valve 30 remains open, and the drain switching valve 32 and the air introduction switching valve 33 remain in the closed position. Level d is the full position of the lubricating oil, level e is the replenishing position, and level f is the minimum position. In FIG. 4, before the lubricating oil m drops to the minimum position, the moisture amount reaches the allowable limit value. Shows the situation reached.

  With the opening operation of the refueling switching valve 29, as shown in FIG. 5, the drainage tank 26 is closed and the ventilation tank portion 28 is in the open state to the atmosphere, so that the lubricating oil in the refueling tank 24 is sealed. It flows out due to a drop from the chamber 20 and is supplied to the seal chamber 20 through the supply pipe 23. That is, when the oil level of the seal chamber 20 is lower than the set height position at the start of lubricating oil supply to the seal chamber 20 by the air vent control means 38 incorporated in the control device 34, the level is low. At least the three-way valve (the switching valve of the switching valve) is from the detection of the oil level until the oil level in the seal chamber 20 rises to the set height position (level e in this case) by replenishing oil from the oil tank 24. One example) It is configured to perform air bleeding control to switch 31 to the second position and hold it.

  When the oil level in the seal chamber 20 rises to the level e by replenishing the lubricating oil m, the oil supply switching valve 29 is moved to the open position as shown in FIG. In the state where it is maintained, the three-way valve 31 is switched to the first position where the oil supply tank 24 and the drainage tank 26 communicate with each other. Then, since the air release path 27 is closed, the lubricating oil m replenished from the oil supply tank 24 cannot remain at the level e or higher in the seal chamber 20 and instead accumulates at the bottom of the seal chamber 20. The intruding water w is started to be pushed out to the discharge pipe 25 by the supply pressure of the lubricating oil m.

  By continuing the replenishment of the lubricating oil, as shown in FIG. 7, the state where only the water (intrusion water) w is pushed out to the discharge pipe 25 while the oil level position in the seal chamber 20 is maintained at the level e continues for a while. FIG. 7 depicts the situation when most of the extruded water w has been collected in the drainage tank 26 and the bottom end of the water w has just reached the level e. In this case, although not shown in the drawing, when moisture is collected in the drainage tank 26, the drain switching valve 32 is opened and the drainage passage 35 is opened without temporarily collecting the collected ingress water in the drainage tank 26. It is also possible to make it drain through. In other words, when the detected value by the moisture meter 21 in the oil reaches a predetermined value by the water drain control means 37 incorporated in the control device 34, the lubricating oil m in the oil supply tank 24 is replenished to the seal chamber 20, thereby providing a bottom portion. The drainage control is performed to drain the intruding water w accumulated in the water through the discharge pipe 25.

  Then, as shown in FIG. 8, when all of the extruded intrusion water w is collected in the drainage tank 26, that is, the upper end of the lubricating oil m rising in the drainage pipe 25 is at the bottom level of the drainage tank 26. When reaching the state, the oil supply switching valve 29 is switched to the closed position to stop the supply of the lubricating oil m. In this state, for example, the control for judging with a lapse of a predetermined time after the detection value of the moisture meter 21 in the oil supply oil shows the minimum value, or the oil detection means 36 is discharged as shown by the phantom line in FIG. Means such as providing in the liquid tank 26 are conceivable.

  When all the infiltrated water w is collected in the drainage tank 26, as shown in FIG. 9, the three-way valve 31 is switched to the second position to open the seal chamber 20 to the atmosphere, and the drain switching valve 32 and the air By opening the switching valve 33 for introduction, the intrusion water w collected in the drainage tank 26 is drained through the drain passage 35, and thereby the tank can be emptied. The phantom horizontal line drawn in the drainage tank 26 indicates the highest position (allowable upper limit position) of the upper surface position of the collected ingress water w (see FIG. 8). In the above description, the water (intrusion water) is discharged, but it may be a mixture of water and lubricating oil.

  Although illustration is omitted, when the drain tank 26 becomes empty, the drain switching valve 32 is closed and the lubricating oil m accumulated in the discharge pipe 25 can be returned to the seal chamber 20 by gravity, thereby It is possible to recover the oil level of the seal chamber 20 from the level e to the level d. Further, if the refueling switching valve 29 is a three-position switching valve that opens the supply pipe 23 to the atmosphere and the oil tank 24 can be switched to a position where it is cut off, the lubricating oil in the supply interval 23 is also returned to the seal chamber 20. It is possible and convenient.

  By the way, in the drainage control described above, the lubricating oil m is dropped and supplied by gravity, that is, the water is pushed out and discharged using the potential energy. That is, as shown in FIGS. 4 and 7 to 9, the height position of the set maximum liquid level in the discharge pipe 25 is the oil supply so that the forced push-out movement of the ingress water by replenishing the lubricating oil to the seal chamber is performed by gravity. A state in which the height of the oil supply tank 24 with respect to the seal chamber 20 is multiplied by the specific gravity difference between water and lubricating oil and lower than the value obtained by dividing by the specific gravity of water, rather than the height position of the oil outlet 24a of the tank 24. Is set to More specifically, the set maximum height position of the stored water surface in the drain tank 26, that is, the position of the air introduction switching valve 33 (also the outlet of the discharge pipe 25) is the oil outlet (in this case, the oil supply). The position of the bottom of the tank 24) The height H1 of the oil outlet 24a with respect to the seal chamber 20 is multiplied by the specific gravity difference (β-α) between the lubricating oil m and the water w, and the specific gravity of the water. It is set so as to be lower than the value divided by β (see formula (2) described later).

More specifically, the specific gravity of the lubricating oil and water is α, β, the height from the bottom of the seal chamber 20 to the oil outlet 24a of the oil supply tank 24 is H1, and the liquid is discharged from the bottom of the seal chamber 20 When the height to the position of the air introduction switching valve 33 in the tank 26 (an example of “the set maximum liquid level in the discharge path”) is H2,
α × H1> β × H2 (1)
The height positions H1 and H2 are determined so that That means
H1−H2> H1 × (β−α) / β (2)
In the tank facility T, the middle aeration tank portion 28 is used as a space layer having a width in the vertical direction so that the required vertical dimension difference between the oil supply tank 24 and the drainage tank 26 is obtained.

  By setting the conditions in this manner, if the valve is switched when necessary, the lubricating oil can be replenished to the seal chamber 20 by the potential energy and the water can be drained from the seal chamber 20 when the lubricating oil is replenished. This is a technology that does not require a dedicated drive source such as a drain pump, an oil supply motor mechanism, or an air supply mechanism, and allows maintenance of the seal chamber 20 such as drainage and oil replenishment with inexpensive and simple means. It can be done. In other words, it is possible not only to drain the seal chamber on the surface of the water without pulling up the submersible pump, but also to replenish the necessary lubricating oil at the same time without using a dedicated drive source. Is.

  As shown in the reference, the tank facility T may have a compact structure in which the three-way valve 31 is housed in the ventilation tank portion 28 as shown in FIG. In this case, it is convenient that the first port p1 is configured to open at the upper end of the drainage tank 26 and the upper end of the valve pipe 39 connected to the third port p3 opens to the upper end of the fuel tank 24. it is conceivable that. Although not shown, instead of the three-way valve 21, a switching valve for opening to the atmosphere (usually switched to the closed position) connected to the opening furnace 27 or the ventilation tank section 28, and a drain tank 26 is provided with a switching valve for opening to the atmosphere connected to the upper part of 26 (the structure that can also be used as the switching valve 33 for introducing air), and the function equivalent to the function of the three-way valve 21 is exhibited by controlling the opening and closing separately. You may do it.

[Example 2]
The water draining apparatus B according to the present invention may be applied to the axial flow type submersible pump A shown in FIG. In FIG. 10, 1 is a suction cover, 3 is an impeller, 4 is a casing, 6 is a mechanical seal, 7 is a bearing, 8 is a main shaft, 10 is a motor frame, 11 is a motor, 18 is a cable, 19 is an oil level detecting means. , 21 is a moisture detecting means, 23 is a lubricating oil supply path, 25 is a discharge pipe 25, and 27 is an atmosphere open path. Reference numeral 20 denotes a seal chamber. Since the draining device B itself is the same as that according to the first embodiment, the description thereof is omitted here. Further, it goes without saying that the axial flow type submersible pump A may be a mixed flow type submersible pump and is not limited to the pump type.

Example 3
The water draining device B may be configured as shown in FIG. That is, an oil tank 24 connected to the upper end of the seal chamber 20 via an oil supply pipe 23 is arranged at a high position on the water surface, and an outlet 25a connected to the lower end of the seal chamber 20 has an outlet 25a as a water storage tank. In this configuration, the side wall 46 of W is provided so as to be taken out through waterproofing. In other words, when the moisture detecting means 21 detects moisture, the submersible pump A is stopped so that water is accumulated at the bottom of the seal chamber 20, and then the lubrication oil m is supplied to the seal chamber 20 by opening the oil supply switching valve 29. By doing so, it is a device that pushes out the water w having a specific gravity higher than that of oil by the potential energy described above and drains it from the discharge pipe 25. In this case, the portion of the discharge pipe 25 that penetrates the side wall 46 corresponds to the “set maximum liquid level in the discharge path”.

  FIG. 11 depicts a state in which water is being drained by replenishing the lubricating oil from the oil supply tank 24 to the seal chamber 20, and the oil supply switching valve 29 is switched to the open position, but is normally closed. Has been operated. Further, when the mechanical seal is damaged and the lubricating oil flows out, the decrease in the lubricating oil can be detected by the oil level sensor 19, so that the lubricating oil can be appropriately supplemented. By doing so, even if the mechanical seal is damaged, the operation can be maintained for a certain period of time.

Sectional view showing the schematic structure of a spiral submersible pump Schematic showing how the submersible pump in FIG. 1 is used Plan view of FIG. Schematic diagram showing the schematic configuration of the water draining apparatus (Example 1) Schematic diagram showing the state of air bleeding by oil replenishment Schematic diagram showing the moisture discharge start state Schematic diagram showing the state immediately before the end of moisture discharge control Schematic diagram showing the end state of moisture discharge control Schematic diagram showing the drain completed state from the drainage tank Sectional view of an axial flow type submersible pump having a water draining device (Example 2) Principle diagram showing another structure of the water draining device (Example 3) Schematic diagram showing another structure of tank equipment

Explanation of symbols

3 Impeller 6 Mechanical seal 8 Spindle 11 Motor 20 Seal chamber 21 Moisture detection means 23 Supply pipe 24 Oil supply tank 24a Oil outlet 25 Discharge pipe (discharge path)
26 Drainage tank (discharge path)
27 Atmospheric open passage 31 Switching valve, three-way valve 34 Control means b Pump part p1 1st port p2 2nd port p3 3rd port A Submersible pump B Drainage device L Water surface W Water pool location

Claims (6)

An impeller driven by a motor via a main shaft, a seal chamber that houses a mechanical seal provided on the main shaft between the motor and the impeller, and an amount of moisture in the seal chamber or a moisture amount relative to lubricating oil A submersible pump comprising a moisture detecting means for detecting the ratio of the oil, a fuel tank for supplying lubricating oil via a supply pipe connected to the seal chamber, and a discharge path connected to the bottom of the seal chamber A device,
The height position of the set maximum liquid level in the discharge passage is multiplied by the specific gravity difference between water and lubricating oil to the height of the oil outlet with respect to the seal chamber rather than the height position of the oil outlet of the oil tank. Is set to be lower than the value divided by the specific gravity of water,
When the detection value by the moisture detection means reaches a predetermined value, the lubricating oil in the oil tank is replenished to the seal chamber by using gravity, so that the infiltrated water or the mixture of water and lubricating oil is accumulated at the bottom thereof. A submersible pump device provided with control means for performing drainage control for discharging water through the discharge passage.   An air opening path communicating with the upper end of the seal chamber, a switching valve capable of opening and closing the air opening path and normally maintained in a closed position, and an oil for detecting the oil level of the lubricating oil Surface detecting means, and the control means detects the lower oil level when the oil level in the seal chamber is lower than a set height position at the start of lubricating oil supply to the seal chamber. From time to time, until the oil level in the seal chamber rises to a set height position due to oil replenishment from the oil tank, the air vent control is performed to switch the switching valve to the open position. Item 2. The submersible pump device according to Item 1.   The drainage path is provided with a drainage tank capable of storing the ingress water or lubricating oil discharged from the seal chamber, and the set maximum height position of the stored liquid level in the drainage tank is set in the oil supply tank. The height of the oil outlet is set to be lower than the value obtained by multiplying the height of the oil outlet with respect to the seal chamber by the specific gravity difference between water and lubricating oil and dividing by the specific gravity of water. The submersible pump device according to claim 1 or 2.   The submersible pump device according to claim 3, wherein the oil supply tank and the drainage tank are disposed above a water surface of a water reservoir portion where the submersible pump is buried. The drainage path is provided with a drainage tank capable of storing the ingress water or lubricating oil discharged from the seal chamber, and the set maximum height position of the stored liquid level in the drainage tank is set in the oil supply tank. The height of the oil outlet is set to be lower than the height of the oil outlet relative to the seal chamber by a specific gravity difference between water and lubricating oil, and divided by the specific gravity of water,
The switching valve has a first port connected to an upper portion of the drainage tank, a second port connected to the atmosphere release path, and a third port opened to the atmosphere, and the first port; Switching between a first position in which the third port is communicated and the second port is closed, and a second position in which the second port and the third port are communicated and the first port is closed Is configured as a free three-way valve,
The control means is configured to switch the three-way valve to the second position during the air bleeding control, and to switch the three-way valve to the first position during the water draining control,
3. The underwater according to claim 2, wherein the tank facility configured by arranging the oil supply tank and the drainage tank in this order from the top to the bottom is arranged above the water surface of the water reservoir where the submersible pump is buried. Pump drainer. An impeller driven by a motor via a main shaft, a seal chamber that houses a mechanical seal provided on the main shaft between the motor and the impeller, and an amount of moisture in the seal chamber or a moisture amount relative to lubricating oil A submersible pump comprising a moisture detecting means for detecting the ratio of the oil, a fuel tank for supplying lubricating oil via a supply pipe connected to the seal chamber, and a discharge path connected to the bottom of the seal chamber Intrusion water discharge method of the seal chamber,
The height position of the set maximum liquid level in the discharge passage is multiplied by the specific gravity difference between water and lubricating oil to the height of the oil outlet with respect to the seal chamber, rather than the height position of the oil outlet of the oil tank. When the value detected by the moisture detecting means reaches a predetermined value, the lubricating oil in the oil tank is replenished to the seal chamber by using gravity. An intrusion water discharge method for a seal chamber of a submersible pump, wherein intrusion water or a mixture of water and lubricating oil accumulated at the bottom of the seal chamber is discharged through the discharge passage.

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