JP4702064B2 - Self-priming pump - Google Patents

Description

  The present invention relates to a self-priming pump, for example, a self-priming pump used as a circulation pump used for additional cooking incorporated in a water heater. The present invention relates to a self-priming pump that can

  Conventionally, Patent Document 1 is known as a self-priming pump. Such a self-priming pump as shown in Patent Document 1 is incorporated in, for example, a water heater. A water heater incorporating a self-priming pump is installed near the back door of a building if it is a detached house, and If it is a housing complex like an apartment, it will be installed next to the entrance. And normally, the full length of piping will be about 5 m or less by being installed near the bathtub. However, depending on the room layout, a water heater may be installed at a location opposite to the bathtub, and in such a case, the pipe length may be 20 to 25 m at the maximum.

  Here, conventionally, copper pipes are generally used, and pipe inner diameters of about φ12 to φ15 mm are used.

  Since the self-priming pump incorporated in this type of conventional water heater has a pipe inner diameter of φ12 to φ15 mm as described above, the pipe resistance is not so large, and the air remaining in the pipe and the pump chamber is smooth. Can be discharged.

  FIG. 5 shows a cross-sectional view of an example of a conventional self-priming pump P of this type. 6 is a front view of the casing body 13 in which the impeller 3 is housed, FIG. 3 is a front view of the partition plate 6 in the casing 18, and FIG. 4 is a rear view of the casing cover 16 as viewed from the open side.

  In FIG. 5, 1 is an electric motor, and one side of the casing 18 is attached to one side thereof. The casing 18 is configured by combining a casing main body 13 opened on one side and a casing cover 16 opened on one side.

  That is, the casing main body 13 is attached to one side of the electric motor 1, and the rotating shaft 14 of the electric motor 1 is coupled to the impeller 3 in the impeller chamber 5 provided in the casing main body 13. A casing 18 having a pump chamber 17 formed therein is formed by coupling the opening side of the casing cover 16 to the opening side (side opening side opposite to the electric motor 1) of the casing body 13 via the partition plate 6 and the packing 15. It is.

  As shown in FIG. 3, the partition plate 6 is formed with a central hole 6a, a reflux hole 6b for forming one of the reflux parts 10 ', and a circulation hole 6c at predetermined positions. 15 is configured to prevent water leakage from the periphery of the central hole 6a, the reflux hole 6b, and the circulation hole 6c.

  Further, as shown in FIG. 5, the impeller 3 is accommodated in the impeller chamber 5 of the casing body 13, and the rotary shaft 14 protrudes from the central portion of the impeller chamber 5. The impeller 3 is attached to the tip portion with the mechanical seal 19 sandwiched between the motor 1 and the pump chamber 17.

  The impeller 3 is provided with a blade 2 for sucking and discharging water, and a front shroud 4 is attached to the front surface of the blade 2. The front shroud 4 is provided with an opening 11 in the center of the disk shape, and the opening 11 is opposed to the central hole 6a of the partition plate 6, and this portion serves as the suction portion 21 of the impeller 3, and the opening A mouth ring 20 protrudes forward from the peripheral edge of 11, and a small gap 12 ′ is formed between the tip of the mouth ring 20 and the partition plate 6. This makes it difficult for the water discharged from the blade 2 to return to the suction portion 21 of the impeller 3 and increases the efficiency of the pump.

  The casing body 13 is provided with an impeller chamber 5, a discharge passage 8, and a delivery tank unit 9, and water flowing out of the impeller chamber 5 is sent to the delivery tank unit 9 through the discharge passage 8. Further, the delivery tank unit 9 and the impeller chamber 5 communicate with each other through a hole 37 for constituting another reflux unit 10.

  As shown in FIG. 4, a suction passage 23 communicating with the suction joint 22 and a water tank portion 24 are formed in the casing cover 16. The suction passage 23 communicates with the impeller chamber 5 of the casing body 13 through a central hole 6a of the partition plate 6 shown in FIGS. The water tank 24 and the delivery tank 9 are communicated with each other through a flow hole 6c provided in the partition plate 6 shown in FIG. In FIG. 4, 25 is a discharge joint communicating with the water tank portion 24, and 26 is a steam / water separation chamber formed in the upper portion of the water tank portion 24. A drainage joint 27 communicates with the water tank portion 24. A drainage pipe 29 having an on / off valve 28 such as a solenoid valve is connected to the drainage joint 27 as shown in FIG. By opening the valve, the water in the pump can be drained to the outside, and the on-off valve 28 is closed during operation.

  FIG. 7 is a schematic configuration diagram showing a use state of a conventional self-priming pump P. In FIG. 7, 30 is a water heater, 31 is a suction pipe, 32 is a discharge pipe, 33 is a heat exchanger, and 34 is a bathtub. . The suction pipe 31 is connected to a water pipe 36 by providing a three-way switching valve 35 on the way.

  Next, the operation will be described.

  First, the on-off valve 28 is closed, the three-way switching valve 35 is switched, the suction pipe 31 side is closed, and the water pipe 36 side is opened, thereby pouring a fixed amount of tap water as priming water. The injected water enters the impeller chamber 5.

  Next, the three-way switching valve 35 is switched to close the water pipe 36 side, the suction pipe 31 side is opened, and when the motor 1 is driven, the impeller 3 in the impeller chamber 5 rotates. Then, the water in the impeller chamber 5 is stirred by the blade 2 of the impeller 3, and bubbles are mixed in the water at this time. Water mixed with air enters the delivery tank section 9 through the discharge passage 8, and most of the water and air flow into the water tank section 24 in the casing cover 16 through the circulation hole 6 c provided in the partition plate 6. To do. Here, a part of the water is returned to the impeller 3 through the hole 37 for constituting the recirculation part 10 to enhance the self-priming efficiency.

  Since the air / water separation chamber 26 is provided in the upper part of the water tank part 24 in the casing cover 16, the water flowing into the water tank part 24 in the casing cover 16 through the flow hole part 6 c of the partition plate 6 is In the steam / water separation chamber 26, the air and water are separated, and the air is discharged from the discharge joint 25 through the heat exchanger 33 through the discharge pipe 32 and into the bathtub 34 as shown by an arrow C in FIG. 4.

  Further, a part of the water returns to the impeller chamber 5 again from the water tank portion 24 through the return hole portion 6b for constituting the return portion 10 'provided in the partition plate 6 as shown by an arrow D in FIG. Similarly, self-priming efficiency is improved. That is, water circulates between the impeller chamber 5 and the water tank 24 and only air flows out to the outside. When this state continues, the pressure gradually decreases in the suction passage 23 from the central portion of the impeller chamber 5 and the suction pipe 31. The water in the bathtub 34 is sucked up by the pressure difference in the suction passage 23 and the external pressure, and the air in the pipe is discharged one after another. When water flows into the suction passage 23 through the suction pipe 31 through the suction pipe 31, it shifts to a full-scale water absorption state and performs a circulation operation.

  When the circulation operation starts, most of the water is discharged from the discharge joint 25 via the circulation hole 6c, but a part of the water is returned to the suction portion 21 of the impeller 3 via the arrow E in FIG. It is. The water passing through the arrow E in FIG. 5 is a leak, and the smaller one can increase the efficiency. Therefore, the amount of leakage is reduced by setting the distance of the small gap 12 'between the tip of the mouth ring 20 and the partition plate 6 to be the minimum.

  The air remaining in the pump and the piping is discharged from the discharge joint 25 by the pump operation, but is not completely discharged, and a part of the air is drawn into the pump chamber 17 and near the center of the impeller 3 by centrifugal force. Try to concentrate. In particular, the portion where the mouth ring 20 and the partition plate 6 are close to each other is narrower than the diameter of the air lump, so that the surface tension is increased and it is easy to concentrate. However, since the air discharge capability of the pump is usually high, air can be discharged without any problem, so this is not a problem.

  By the way, in recent years, for the purpose of improving workability, a pipe called a pair tube used for heating has come to be used as a pipe for bathing. This pipe called a pair tube is a resin pipe that is connected in the direction of return and return, and can be connected at the same time, and is made of resin, so that it is lightweight and easy to connect. For this reason, it has become common to use a pipe called a pair tube as a pipe for bathing.

  However, since this pair tube has a small inner diameter of φ10 mm, the pipe resistance is large, and if the total length of the pipe is 20 m or more, a large load is generated on the suction side. For this reason, the ability of the pump to discharge air is reduced.

Furthermore, the air concentrated in the vicinity of the mouth ring 20 is not stepped in the radial direction on the end face of the mouth ring 20, so that it is not stirred and entangled forever. Since the lump of material is discharged intermittently for a long time, the problem arises that the end user misunderstands the entrainment of air due to inconvenience of the piping and causes a complaint.
JP 2002-303289 A

  The present invention was invented in view of the above-described conventional problems, and can easily discharge air, reduce pump noise, eliminate small air discharge, and compensate for a decrease in pump efficiency. It is an object of the present invention to provide a self-priming pump that can be used.

  In order to solve the above problems, a self-priming pump according to the present invention reduces the leakage of an electric motor 1, an impeller 3 provided with a blade 2 driven by the electric motor 1 for sucking and discharging water, and an impeller 3. In order to operate efficiently, the front shroud 4 added to the blade 2 surface, the impeller chamber 5 for housing the impeller 3 with the front shroud 4 added thereto, and the partition plate 6 provided on one side of the impeller chamber 5 A hole 6 a for sucking water into the impeller chamber 5 provided in the partition plate 6, a discharge passage 8 through which water flowing out from the impeller chamber 5 flows, and water flowing out from the impeller chamber 5 Receiving tank section 9, a reflux section 10 that communicates the sending tank section 9 and the impeller chamber 5, and the front shroud 4 is formed in a substantially flat surface with the opening 11 at the center, The central opening of the front shroud 4 of the blade 2 The height of the portion opposed to 11 is made higher than the height of the blade 2 of the portion covered with the front shroud 4 so that the raised portion protrudes forward from the opening 11 of the front shroud 4, A portion protruding from the central opening 11 of the shroud 4 is made to face the partition plate 6 through a small gap 12.

  Thus, by eliminating the mouth ring 20 with the front shroud 4 as a substantially flat surface, the distance from the partition plate 6 can be increased, air can be easily discharged, pump noise can be reduced, and Eliminates small air masses. In addition, the height of the portion of the blade 2 facing the central opening 11 of the front shroud 4 is made higher than the height of the blade 2 of the portion covered with the front shroud 4 and the higher portion is the opening of the front shroud 4. The front shroud 4 is made to be a substantially flat surface by projecting forward from the portion 11 and making the portion projecting from the central opening 11 of the front shroud 4 of the blade 2 face the partition plate 6 through a small gap 12. A decrease in pump efficiency due to the elimination of the ring 20 can be compensated.

  In the present invention, the front shroud is substantially flat, so that the distance from the partition plate can be increased, the air surface tension is reduced, and the air remaining in the pump in the pipe is smoothly discharged. This makes it possible to reduce the noise of the pump, eliminate the discharge of small air, and eliminate the cause of the complaint that the end user misunderstands that the air is caught due to inconvenience of the piping. In addition, the height of the portion of the blade facing the central opening of the front shroud is made higher than the blade height of the portion covered with the front shroud so that the raised portion protrudes forward from the opening of the front shroud. By making the portion protruding from the central opening of the front shroud of the blade face the partition plate through a small gap, the front shroud is made almost flat to compensate for the reduction in pump efficiency due to the elimination of the mouth ring. Can do. As a result, the self-priming pump of the present invention can increase the air discharge capability and ensure the necessary pump performance.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  FIG. 1 shows a cross-sectional view of an embodiment of the self-priming pump P of the present invention, and FIG. 2 is a front view of a casing body housing an impeller. Since the front view of the partition plate in the casing is the same as the self-priming pump P described in the above-described conventional example, it will be described with reference to FIG. Further, since the rear view of the casing cover as viewed from the open side is the same as the self-priming pump P described in the above-described conventional example, FIG.

  In FIG. 1, reference numeral 1 denotes an electric motor, and one side of a casing 18 is attached to one side thereof. The casing 18 is configured by combining a casing main body 13 opened on one side and a casing cover 16 opened on one side.

  A casing main body 13 is attached to one side of the electric motor 1, and a rotating shaft 14 of the electric motor 1 is coupled to an impeller 3 in an impeller chamber 5 provided in the casing main body 13. A casing 18 having a pump chamber 17 formed therein is formed by coupling the opening side of the casing cover 16 to the opening side (side opening side opposite to the electric motor 1) of the casing body 13 via the partition plate 6 and the packing 15. It is.

  As shown in FIG. 3, the partition plate 6 is formed with a central hole 6a, a reflux hole 6b for forming one of the reflux parts 10 ', and a circulation hole 6c at predetermined positions. 15 is configured to prevent water leakage from the periphery of the central hole 6a, the reflux hole 6b, and the circulation hole 6c.

  Further, as shown in FIG. 1, the impeller 3 is accommodated in the impeller chamber 5 of the casing body 13, and a rotating shaft 14 projects from the central portion of the impeller chamber 5. The impeller 3 is attached to the tip portion with the mechanical seal 19 sandwiched between the motor 1 and the pump chamber 17.

  The impeller 3 is provided with a blade 2 for sucking and discharging water, and a front shroud 4 is attached to the front surface of the blade 2. The front shroud 4 is provided with an opening 11 at the center of a substantially flat disk, and the opening 11 is opposed to the central hole 6 a of the partition plate 6, and this portion is used as the suction portion 21 of the impeller 3. Yes.

  In the blade 2, the height of the portion facing the central opening 11 of the front shroud 4 is higher than the height of the blade 2 covered by the front shroud 4, and this raised portion becomes the protruding blade portion 2 a. ing. The protruding blade portion 2 a of the blade 2 protrudes forward (to the side of the partition 6 having the hole 6 a) from the central opening portion 11 of the front shroud 4, and the protruding blade portion 2 a protrudes forward from the opening portion 11. The front end faces the partition plate 6 through a small gap 12. Accordingly, the gap between the partition plate 6 and the front shroud 4 having a substantially flat surface is longer than the small gap 12 between the protruding tip of the protruding blade portion 2a and the partition plate 6, and air discharge is reduced. Sufficient distance to ensure smoothness is secured.

  The casing body 13 is provided with an impeller chamber 5, a discharge passage 8, and a delivery tank unit 9, and water flowing out of the impeller chamber 5 is sent to the delivery tank unit 9 through the discharge passage 8. Further, the delivery tank unit 9 and the impeller chamber 5 communicate with each other through a hole 37 for constituting another reflux unit 10.

  As shown in FIG. 4, a suction passage 23 communicating with the suction joint 22 and a water tank portion 24 are formed in the casing cover 16. The suction passage 23 communicates with the impeller chamber 5 of the casing body 13 through a central hole 6 a of the partition plate 6. The water tank portion 24 and the delivery tank portion 9 are communicated with each other through a circulation hole 6 c provided in the partition plate 6. In FIG. 4, 25 is a discharge joint communicating with the water tank portion 24, and 26 is a steam / water separation chamber formed in the upper portion of the water tank portion 24. A drainage joint 27 communicates with the water tank 24. A drainage pipe 29 having an on / off valve 28 such as an electromagnetic valve is connected to the drainage joint 27, and the inside of the pump is opened by opening the on / off valve 28. The water can be drained to the outside, and the on-off valve 28 is closed during operation.

  The self-priming pump P of the above embodiment is used by being incorporated in a water heater 30 as shown in FIG.

  Next, the operation of this embodiment will be described.

  First, the on-off valve 28 is closed, the three-way switching valve 35 is switched, the suction pipe 31 side is closed, and the water pipe 36 side is opened, thereby pouring a fixed amount of tap water as priming water. The injected water enters the impeller chamber 5.

  Next, the three-way switching valve 35 is switched to close the water pipe 36 side and open the suction pipe 31 side. When the motor 1 is driven, the impeller 3 in the impeller chamber 5 rotates. Then, the water in the impeller chamber 5 is stirred by the blade 2 of the impeller 3, and bubbles are mixed in the water at this time. Water mixed with air enters the delivery tank section 9 through the discharge passage 8, and most of the water and air flow into the water tank section 24 in the casing cover 16 through the circulation hole 6 c provided in the partition plate 6. To do. Here, a part of the water is returned to the impeller 3 through the hole 37 for constituting the recirculation part 10 to enhance the self-priming efficiency.

  Since the air / water separation chamber 26 is provided in the upper part of the water tank part 24 in the casing cover 16, the water flowing into the water tank part 24 in the casing cover 16 through the flow hole part 6 c of the partition plate 6 is In the steam / water separation chamber 26, the air and water are separated, and the air is discharged from the discharge joint 25 through the heat exchanger 33 through the discharge pipe 32 and into the bathtub 34 as shown by an arrow C in FIG. 4.

  Further, a part of the water returns to the impeller chamber 5 again from the water tank portion 24 through the return hole portion 6b for constituting the return portion 10 'provided in the partition plate 6 as shown by an arrow D in FIG. Similarly, self-priming efficiency is improved. That is, water circulates between the impeller chamber 5 and the water tank 24 and only air flows out to the outside. When this state continues, the pressure gradually decreases in the suction passage 23 from the central portion of the impeller chamber 5 and the suction pipe 31. The water in the bathtub 34 is sucked up by the pressure difference in the suction passage 23 and the external pressure, and the air in the pipe is discharged one after another. When water flows into the suction passage 23 through the suction pipe 31 through the suction pipe 31, it shifts to a full-scale water absorption state and performs a circulation operation.

  When the circulation operation is started, most of the water is discharged from the discharge joint 25 via the circulation hole 6c, but a part of the water is returned to the suction portion 21 of the impeller 3 via the arrow E in FIG. It is.

  Here, even when the pipe resistance is large and a large load is generated on the suction side, and the air discharge capacity of the pump is reduced, the front shroud 4 is substantially flat and the mouth ring 20 is not provided as in the conventional case. Since the distance between the front shroud 4 and the partition plate 6 can be secured sufficiently larger than the diameter of the air mass, and there is no influence of the surface tension, the air can be concentrated near the mouth ring 20 as in the prior art. And is smoothly drawn to the suction portion 21 of the impeller 3 and discharged together with water.

  However, if the front shroud 4 is a substantially flat surface and the mouth ring 20 is not provided, the leakage in the direction of arrow E in FIG. 1 increases, and the efficiency of the pump decreases. However, in the present invention, the height of the portion of the blade 2 facing the central opening 11 of the front shroud 4 is made higher than the height of the blade 2 covered by the front shroud 4 so that the height is increased. The front shroud 4 is protruded forward from the opening 11 and the portion of the blade 2 protruding from the central opening 11 of the front shroud 4 is opposed to the partition plate 6 through the small gap 12. , And the original work amount of the blade 2 for scooping out water increases, so that the performance as a pump does not deteriorate. The protruding blade portion 2a portion, which is the portion located in the suction portion 21 of the blade 2, has a small distance from the partition plate 6, but since there is a step in the radial direction from the end face of the blade 2, air can be efficiently stirred. As a result, air can be smoothly discharged together with water.

  As a result, it is possible to realize an excellent self-priming pump P that does not generate abnormal noise due to air entanglement and that can maintain the pump performance.

  In the above-described embodiment, the self-priming pump P of the present invention has been described as an example of being used for additional cooking by incorporating it in a water heater. However, the present invention is not limited to this, and the fuel cell device, the heat pump device, or It can be used as a pump for various other devices.

It is sectional drawing of one Embodiment of the self-priming pump of this invention. It is a front view of the casing main body which accommodated the impeller same as the above. It is a front view of the partition plate in a casing common to this invention and a prior art example. It is the rear view which looked at the casing cover common to this invention and a prior art example from the open side. It is sectional drawing of the self-priming pump of a prior art example. It is a front view of the casing main body which accommodated the impeller of the prior art example. It is a schematic block diagram which shows the use condition of a self-contained pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Blade 3 Impeller 4 Front shroud 5 Impeller chamber 6 Partition plate 6a Hole part 8 Discharge passage 9 Delivery tank part 10 Reflux part 11 Opening part 12 Small gap

Claims (1)

  An electric motor, an impeller that is driven by the electric motor and has a blade for sucking and discharging water, a front shroud added to the blade surface to reduce the impeller leakage and operate efficiently, and a front shroud are added An impeller chamber for storing the impeller, a partition plate provided on one side of the impeller chamber, a hole for sucking water into the impeller chamber provided on the partition plate, and water flowing out of the impeller chamber A discharge passage for water, a delivery tank part for receiving water flowing out from the impeller chamber, a return part for communicating the delivery tank part and the impeller chamber, and the front shroud having an opening at the center The height of the portion formed on a substantially flat surface and facing the central opening of the front shroud of the blade is made higher than the blade height of the portion covered with the front shroud, and the raised portion is used as the front shroud. To bring up from the opening portion protrudes forward, self-priming pump, characterized by comprising in opposition a central portion protruding from the opening of the front shroud of the blade through the small gap to the partition plate.

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