JP6134178B2 - Vertical shaft pump device - Google Patents

Description

  The present invention relates to a vertical shaft pump device in which a main shaft having an impeller attached to a lower end portion thereof is rotatably supported by a vertical lifting water pump via a bearing, and a cooling mechanism for supplying cooling water to the bearing is provided. About.

  In Patent Document 1, in order to cool the bearing of the main shaft of the vertical shaft pump, a shaft seal device is provided at both ends of the bearing, the shaft seal device and the bearing are connected by a protective tube to form a sealed portion, A vertical shaft pump device is disclosed in which cooling water is supplied to a part from a sealed water tank, and water leakage from the shaft seal device is detected by fluctuations in the water surface of the sealed water tank to automatically supply cooling water.

  Patent Document 2 also discloses a storage for the risk of the temperature of the lubricating liquid rising due to the sliding heat of the shaft sealing device or the bearing, or the lubricating liquid being insufficient due to evaporation or the like, causing the shaft sealing device or the bearing to burn out. There has been disclosed a vertical shaft pump device which is configured to circulate and supply cooling water from a liquid tank to a protective pipe and which is provided with a heat radiation mechanism for cooling the circulating water based on the liquid temperature in the liquid storage tank.

Japanese Patent Laid-Open No. 04-334794 Japanese Patent Laid-Open No. 11-324967

  The conventional vertical shaft pump device described above is based on the premise that good-quality cooling water is sufficiently secured, and a shaft seal device, such as a gland packing, that is inexpensive and allows some water leakage is used. In order to prevent the rubber material and the resin member as the bearing material from rising above a predetermined heat-resistant temperature, it was set so that a safe and large amount of cooling water was supplied to the protective tube in anticipation of the amount of water leakage. .

  However, if high-quality cooling water is not sufficiently secured, use an expensive shaft seal device such as a mechanical seal with little water leakage, an expensive ceramic bearing with high heat resistance and wear resistance, or use cooling water. There was a problem that the equipment cost increased, for example, it was necessary to provide a mechanism for circulating supply.

  In view of the above problems, an object of the present invention is to provide a vertical shaft pump device including a cooling mechanism capable of efficiently cooling with a minimum amount of water while using an inexpensive bearing.

In order to achieve the above-mentioned object, the first characteristic configuration of the vertical shaft pump device according to the present invention is that, as described in claim 1 of the claims, the main shaft with the impeller attached to the lower end portion is vertical. A vertical shaft pump device that is rotatably supported by a pumped water pipe through a bearing and is provided with a cooling mechanism that supplies cooling water to the bearing, the shaft seal device provided at a lower portion of the bearing, The main shaft is covered with a protective tube that is watertightly connected to the bearing, and a temperature sensor that detects an inflow temperature of the cooling water flowing into the bearing and an outflow temperature of the cooling water flowing out of the bearing is provided, The cooling mechanism includes a water absorption tank and a water absorption pump, and is configured to variably adjust the supply amount of the cooling water stored in the water absorption tank by the water absorption pump based on a difference value between the two temperatures. Have There is a point.

Since the temperature rise due to the sliding friction of the bearing is cooled by the cooling water, whether the amount of cooling water at that time is appropriate based on the difference value of the cooling water temperature before and after cooling regardless of various seasonal fluctuation factors It becomes possible to accurately grasp whether or not. As a result, the degree of heat generation of the bearing can be grasped, and the amount of cooling water supplied to the bearing is adjusted by the cooling mechanism to the extent that the bearing does not burn out based on the temperature. Accordingly, the bearing can be cooled with a minimum amount of cooling water even in the case where an inexpensive bearing is used in an environment where high-quality cooling water such as clean water cannot be sufficiently secured.

According to the second characteristic configuration, as described in claim 2, a main shaft having an impeller attached to a lower end portion thereof is rotatably supported by a pumping pipe having a vertical posture via a bearing, and the bearing has cooling water. A vertical shaft pump device provided with a cooling mechanism for supplying the shaft, the shaft sealing device provided at the lower part of the bearing and the bearing is covered with a protection tube in which the bearing is watertightly connected, and the main shaft is covered. A temperature sensor for detecting the temperature of the cooling water flowing out of the bearing and a predetermined environmental temperature is provided, and the cooling mechanism includes a water absorption tank and a water absorption pump, and the water absorption tank is provided with the water absorption pump based on a difference value between the two temperatures. The supply amount of the stored cooling water to the protective pipe is variably adjusted .

Based on the difference between the temperature of the cooling water flowing out of the bearing and the predetermined environmental temperature, it is possible to absorb the error due to various environmental fluctuation factors and grasp the accurate value of the cooling capacity of the cooling water flowing out of the bearing. become. For example, the atmospheric temperature, the cooling water temperature before supply, or the like can be used as the predetermined environmental temperature in order to absorb errors due to seasonal fluctuations. As a result, the degree of heat generation of the bearing can be grasped, and the amount of cooling water supplied to the protective tube is adjusted by the cooling mechanism to the extent that the bearing does not burn based on the temperature. In this case, since the cooling water is radiated by the pumping during the pumping operation, the supply amount of the cooling water to the protective tube can be further reduced.

As described in the third aspect, the third characteristic configuration is that, in addition to the first or second characteristic configuration described above, the bearing is a rubber bearing or a resin bearing .

A rubber bearing or a resin bearing can be suitably used as an inexpensive bearing.

In the fourth feature configuration, as described in claim 4, in addition to any of the first to third feature configurations described above, the cooling water is made of high-quality water including clean water. It is in.

Even with a small amount of cooling water, it is possible to avoid the wear of the bearing and cool it well.

In addition to any of the first to fourth feature configurations described above, the fifth feature configuration is always driven at a low speed or intermittently, in addition to any of the first to fourth feature configurations described above, A cooling control unit that supplies cooling water from the lower end side of the protective tube and continuously supplies a minute amount of cooling water slightly overflowing from the upper shaft seal device provided in the protective tube is provided. is there.

An appropriate amount of cooling water can be appropriately supplied using a water supply pump.

  As described above, according to the present invention, it is possible to provide a vertical shaft pump device including a cooling mechanism capable of efficiently cooling with a minimum amount of water while using an inexpensive bearing.

Explanatory drawing of the vertical axis mixed flow pump which shows 1st embodiment of this invention Explanatory drawing of the vertical-shaft mixed flow pump which shows 2nd embodiment of this invention Explanatory drawing of the main part of the present invention Explanatory drawing of the principal part of another embodiment of this invention Explanatory drawing of the principal part of another embodiment of this invention

The vertical shaft pump device according to the present invention will be described below.
FIG. 1 shows a first embodiment, and an vertical shaft mixed flow pump device P (hereinafter referred to as “vertical pump P”) is shown as an example of a vertical shaft pump device. In the vertical shaft pump P, a main shaft 2 having an impeller 3 attached to a lower end thereof is rotatably supported by a vertical lifting pump 6 via a plurality of rubber bearings 1 (hereinafter referred to as “bearings 1”). The discharge bowl 4 that houses the impeller 3 is connected to the tip of the pumping pipe 6, and the suction bell 5 is connected to the tip of the discharge bowl 4.

  A discharge bend pipe 9 through which the main shaft 2 penetrates in a watertight and rotatable manner is connected to the upper end side of the pumping pipe 6, and the main shaft 2 is connected to the output shaft of the drive unit 10 through a coupling.

  A lower shaft seal device 11 using a mechanical seal or a gland packing is provided below the impeller-side bearing 1, and an upper shaft seal using a labyrinth seal or the like at the joint with the discharge curved pipe 9 above the main shaft 2. A device 12 is provided.

  The main shaft 2 is covered with a protective tube 13 in which the shaft seal devices 11 and 12 and the bearings 1 are connected in a watertight manner, and a cooling mechanism 20 that supplies cooling water for cooling the rubber bearing 1 to the protective tube 13. Is provided.

  The cooling mechanism 20 includes a water supply tank 22, a water supply pump 23, a water supply pipe 24, and a cooling control unit 25. The cooling water stored in the water supply tank 22 is pumped up by the water supply pump 23, and the water supply pipe 24 and the guide are provided. It is supplied from the lower end side of the protective tube 13 via a water supply path 21 formed in the blade 14, and excess water supply is configured to overflow from the upper shaft seal device 12. The water stored in the tank 22 is preferably clean water, but it is also possible to use supernatant water from which solid content contained in the water pumped by the vertical shaft pump P has been removed by precipitation or the like.

  A temperature sensor S using a resistance temperature detector (RTD), a thermocouple, or the like is incorporated in the uppermost bearing 1, and a temperature detected by the temperature sensor S is input to the cooling control unit 25. Yes. The temperature sensor S is installed in the vicinity of the rubber bearing portion so that the temperature of the cooling water that has cooled the bearing 1 can be detected.

  The cooling control unit 25 (cooling mechanism 20) is configured to adjust the amount of cooling water supplied to the protective tube 13, that is, the bearing 1, based on the value of the temperature sensor S. By detecting the temperature of the cooling water that has cooled the bearing 1 by the temperature sensor S, the degree of heat generation of the bearing 1 can be grasped, and the cooling controller 25 supplies the bearing 1 to the extent that the bearing does not burn based on the temperature. The amount of cooling water supplied is adjusted. Therefore, the bearing 1 can be cooled with a minimum amount of cooling water even in the case where the inexpensive bearing 1 is used in an environment where high-quality cooling water such as clean water cannot be sufficiently secured in the water supply tank 22.

  When the cooling water is supplied from the lower end side of the protective tube 13, the cooling water is supplied from the lower side to the upper side. Therefore, the cooling water is installed on the uppermost part of the main shaft 2 having the greatest influence when the cooling water amount decreases. If the temperature of the cooling water flowing out of the bearing 1 is used as an index, the amount of water can be adjusted efficiently.

  The temperature sensor S is embedded in a bearing body, for example, a back metal or rubber portion that holds the rubber of the sliding portion in the case of a rubber bearing, and the cooling control unit controls cooling based on the temperature of the bearing body. You may comprise.

  Details will be described below. The cooling control unit 25 first drives the water supply pump 23 to supply the cooling water to the upper part of the uppermost bearing 1. Since the amount of water supplied by the water supply pump 23 is known, for example, by controlling the drive time of the water supply pump 23, a predetermined amount of water can be supplied. In addition, you may comprise so that the water level of the protective tube 13 may be detected and the water supply pump 23 may be stopped.

  Next, the driving machine 10 is started up and the vertical shaft pump P is driven to start pumping water to the pumping pipe 6. When the main shaft 2 rotates, the bearing 1 generates heat, but when cooling water is dissipated through the protective tube 13 during pumping operation, it is not necessary to supply new cooling water to the protective tube 13. There is also. The following description is the same not only during the pumping operation but also when the main shaft 2 is rotated without pumping, such as a preliminary standby operation. In addition, a speed reducer may be provided at the position of the drive machine 10 and a drive machine that is drivingly connected to the speed reducer may be arranged separately.

  When the cooling water in the protective tube 13 leaks from the lower shaft seal device 11 and the water level of the cooling water decreases, the temperature sensor S detects the temperature rise. When the temperature exceeds a predetermined threshold temperature, the water supply pump 23 is driven. Supply additional cooling water. The driving time of the water supply pump 23 may be controlled so that a certain amount is additionally supplied, or it may be additionally supplied until the temperature detected by the temperature sensor S falls below a predetermined threshold temperature. . You may give the hysteresis which sets the threshold temperature which stops additional supply rather than the threshold temperature which additionally supplies cooling water. Further, the history of measurement data may be monitored to control the supply of cooling water by predicting a temperature rise, or the supply amount may be changed by providing a plurality of threshold values.

  A temperature sensor S is provided in both the uppermost bearing 1 and the water supply tank 22 so as to detect the temperature of the cooling water flowing out of the bearing 1 and a predetermined environmental temperature, and the cooling control unit 25 determines the difference value between the two temperatures. It is preferable that the supply amount of the cooling water is adjusted based on the above. Based on the difference between the temperature of the cooling water flowing out of the bearing 1 and the temperature of the water supply tank 22, an error caused by a change in the water temperature due to seasonal variation when controlling based solely on the temperature of the cooling water flowing out of the bearing 1. Is preferable in that it can be absorbed.

  For example, for a rubber bearing having a heat resistant temperature of about 60 ° C., the temperature of the cooling water supplied from the water supply tank 22 differs greatly between summer and winter, so the threshold temperature for determining whether or not cooling water can be supplied is, for example, a uniform 50 ° C. If it is set, for example, the cooling water may be excessively supplied in summer, and the bearing 1 may be burned out in winter. Even in such a case, based on the difference value, it becomes possible to stably control even if the threshold value is uniform.

  The temperature sensor provided for detecting the environmental temperature is not limited to the mode installed in the water supply tank 22, and a temperature sensor may be installed so as to detect the atmospheric temperature, and the water temperature of the pumping target water is inspected. You may install a temperature sensor so that. If the environmental temperature is detected, errors due to various environmental fluctuation factors can be absorbed, and an accurate value of the cooling capacity of the cooling water flowing through the bearing 1 can be grasped.

  Even when it is determined whether or not the cooling water can be supplied based on the difference value, it is possible to set a hysteresis in the threshold value of the difference between the start and stop of the water supply.

  The cooling controller 25 continuously drives the water supply pump 23 at a low speed or intermittently so as to continuously supply a minute amount of cooling water slightly overflowing from the upper shaft seal device 12 of the protective tube 13. The present invention can be applied even when controlling.

  For example, by increasing or decreasing the amount of water supplied from the water supply pump 23 based on the deviation between the temperature detected by the temperature sensor S and a predetermined threshold temperature, the amount of cooling water is always slightly smaller than the required amount of cooling water supplied. Burnout of the bearing 1 can be avoided by the amount of cooling water.

  As described above, a difference value between the temperature detected by the temperature sensor S and the environmental temperature is obtained, and the amount of water supplied from the water supply pump 23 is increased or decreased based on the deviation between the difference value and a predetermined threshold temperature. You may control. In this case, it is preferable to adopt PID control as the control mode.

  FIG. 2 shows a second embodiment. The difference from the first mode is that cooling water is supplied from the upper end side of the protective tube 13, and the temperature sensor S determines the temperature of the cooling water flowing out of the bearing 1 installed at the lowermost part of the main shaft 2. It is the point comprised so that it may detect. In addition, the same code | symbol is attached | subjected to the same site | part as FIG. 1, and description of the site | part is abbreviate | omitted.

  When the cooling water is supplied from the upper end side of the protective tube 13, the cooling water is supplied from the upper side to the lower side. The amount of water can be adjusted efficiently by using the temperature of the cooling water flowing out from the bearing installed at the bottom as an index.

  Also in the second aspect, it is possible to perform the cooling water supply control based on the difference value between the temperature of the cooling water flowing out of the bearing as described above and the predetermined environmental temperature, and the cooling water is added. It is also possible to give hysteresis to the threshold value for stopping and the threshold value for stopping.

  In the above-described example, the mode in which the temperature sensor S that detects the temperature of the cooling water flowing out of the bearing 1 is provided in the uppermost bearing 1 or the lowermost bearing 1 has been described, but each bearing 1 is provided with the temperature sensor S. The cooling water may be additionally supplied when the threshold temperature is exceeded by at least one bearing 1.

  In any of the first and second aspects, the temperature sensor S is incorporated in two locations, the uppermost bearing and the lowermost bearing, and if either one exceeds the threshold temperature, cooling water is additionally supplied. It may be configured. The temperature sensor S provided in the uppermost bearing can indirectly grasp the drop in the water level, and the most severe cooling environment is provided by the temperature sensor S provided in the lowermost bearing that is subjected to the largest load and is most likely to generate heat. I can grasp it.

  Further, as shown in FIG. 3, temperature sensors S1 and S2 for detecting the inflow temperature of the cooling water flowing into the bearing 1 and the outflow temperature of the cooling water flowing out of the bearing 1 are provided, and the cooling control unit 25 has a difference between the two temperatures. You may comprise so that the supply_amount | feed_rate of cooling water may be adjusted based on a value. In the first aspect, the inflow temperature is detected by the temperature sensor S2, and in the second aspect, the inflow temperature is detected by the temperature sensor S1.

  According to the difference value of the temperature sensors S1 and S2, it becomes possible to clearly grasp the degree of temperature rise due to the sliding friction of the bearing cooled by the cooling water. Regardless of the fluctuation factors, it is possible to accurately grasp whether or not the amount of cooling water at that time is appropriate.

  The signal lines of the temperature sensors S1 and S2 (indicated by the alternate long and short dash line in the figure) can be taken out via a signal line insertion hole formed when casting the support portion 30 of the bearing 1, for example. .

  Also in this case, as described above, the cooling control unit 25 starts water supply when the difference value between the temperature sensors S1 and S2 exceeds a predetermined water supply threshold value and stops water supply when the difference value falls below a predetermined stop threshold value lower than the water supply threshold value. May be configured.

  Further, the cooling control unit 25 may be configured to increase or decrease the amount of rapid water based on the difference value between the temperature sensors S1 and S2 and a predetermined threshold value.

  In the above description, an example in which the main shaft 2 is provided with the protective tube 13 and the cooling water is supplied to the protective tube 13 has been described. The invention can be applied.

  For example, as shown in FIG. 4, a cooling water supply passage 31 and a drainage passage 32 are formed in the support portion 30 of the bearing 1, and oil seals 33 are provided at the upper and lower ends of the bearing 1, and supplied from the water supply passage 31. The cooling water may flow through the inside of the bearing 1 and be discharged to the drainage channel 32.

  And it can comprise so that temperature sensor S1, S2 may be provided in the both ends of the bearing 1, and the cooling control part 25 may increase / decrease the supply amount of a cooling water based on the difference value of both temperature sensor S1, S2. In this case, it is preferable that the cooling water supplied to each bearing 1 and drained from the drainage channel 32 is returned to the water supply tank 22 and circulated.

  That is, the seal mechanism 33 for preventing the intrusion of pumped water is provided at both ends of the bearing 1, and the cooling pipes 31 and 32 for supplying cooling water from one inner end of the seal mechanism 33 and discharging from the other inner end are arranged. 20 is configured to adjust the supply amount of the cooling water to the cooling pipe based on the values of the temperature sensors S1 and S2.

  In addition, when each bearing 1 is provided with the single temperature sensor S1 which detects the temperature of a cooling water, it is preferable to control the supply amount of a cooling water based on a difference value with environmental temperature.

  The cooling control unit 25 provided in the cooling mechanism 20 is preferably configured to output an abnormal signal to the outside when the value of the temperature sensor S indicates a predetermined abnormal temperature.

  The vertical shaft pump device P is automatically operated based on an abnormal signal output from the cooling control unit 25 when it is understood that the bearing temperature is high and there is a risk of reaching the heat-resistant temperature based on the value of the temperature sensor. Alternatively, it is possible to take appropriate measures such as manually stopping.

  In the embodiment described above, the configuration in which the temperature of the cooling water is measured by the temperature sensor S has been described. However, the temperature sensor S may be configured to measure the temperature of the main body of the bearing 1 as shown in FIG. In this case, although the rubber part 1a which is a sliding part may be used as a measurement point, the temperature of the back metal 1b which holds the outer periphery of the rubber is measured so as not to be affected by deformation or wear in consideration of long-time operation. It is preferable to do this.

  In the embodiment described above, an example using a mixed flow pump as an example of the vertical pump device has been described, but the vertical pump device of the present invention can be applied to an axial flow pump and a centrifugal pump in addition to the mixed flow pump.

  In the embodiment described above, the case where the bearing is a rubber bearing has been described, but the present invention can also be applied to a case where the bearing is a resin bearing in addition to the rubber bearing.

  In the above-described embodiment, the configuration in which the cooling water is supplied by the water supply pump has been described. However, any water supply configuration may be used as long as the supply amount of the cooling water can be controlled, such as supply from the elevated water tank via a valve. May be.

  The above description is one embodiment of the present invention, and the scope of the present invention is not limited by each description. The specific shape, material, size, and the like of each part have the effects of the present invention. The design can be changed as appropriate within a range.

1: Bearing 2: Main shaft 3: Impeller 6: Pump pipe 20: Cooling mechanism 25: Cooling control unit P: Vertical shaft pump device S, S1, S2: Temperature sensor

Claims (5)

A main shaft having an impeller attached to a lower end portion thereof is rotatably supported by a vertical lifting water pump via a bearing, and is a vertical shaft pump device provided with a cooling mechanism for supplying cooling water to the bearing,
The main shaft is covered with a protective tube in which a shaft seal device provided at a lower portion of the bearing and the bearing are connected in a watertight manner, and an inflow temperature of cooling water flowing into the bearing and a cooling water flowing out of the bearing Temperature sensor to detect the outflow temperature of
The cooling mechanism includes a water absorption tank and a water absorption pump, and is configured to variably adjust the supply amount of the cooling water stored in the water absorption tank by the water absorption pump based on a difference value between both temperatures. has been that vertical shaft pump apparatus. A main shaft having an impeller attached to a lower end portion thereof is rotatably supported by a vertical lifting water pump via a bearing, and is a vertical shaft pump device provided with a cooling mechanism for supplying cooling water to the bearing,
The main shaft is covered with a protective tube in which a shaft seal device provided at a lower portion of the bearing and the bearing are connected in a watertight manner, and a temperature for detecting a temperature of cooling water flowing out of the bearing and a predetermined environmental temperature is detected. A sensor is provided,
The cooling mechanism includes a water absorption tank and a water absorption pump, and is configured to variably adjust the supply amount of the cooling water stored in the water absorption tank by the water absorption pump based on a difference value between both temperatures. has been that vertical shaft pump apparatus. The vertical shaft pump device according to claim 1 or 2, wherein the bearing is a rubber bearing or a resin bearing. The vertical shaft pump device according to any one of claims 1 to 3, wherein the cooling water is high-quality water including clean water. The water supply pump is always driven at a low speed or intermittently, cooling water is supplied from the lower end side of the protective tube, and the cooling water slightly overflows from the upper shaft seal device provided in the protective tube. The vertical shaft pump device according to any one of claims 1 to 4, further comprising a cooling control unit that continuously supplies a minute amount.

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