JP6456812B2 - Submersible motor driven pump - Google Patents

Description

  The present invention relates to a submersible motor-driven pump suitable for sewage containing contaminants.

  For example, Patent Document 1 discloses a pump that is driven by a submersible motor and can be continuously operated in the atmosphere. This pump is provided with a water jacket on the motor frame of the dry submersible motor, a heat exchanger filled with water as a primary refrigerant is disposed between the oil box and the pump casing, and this heat exchanger communicates with the water jacket. And the cooling impeller which circulates cooling water is provided in the heat exchanger, and is comprised.

The pumped liquid such as sewage that becomes the secondary refrigerant enters the inner peripheral side from the outer peripheral side of the gap formed by the back surface of the impeller and the inner wall of the pump casing from the discharge flow path of the pump casing, and the pumped side of the cooling element The heat is exchanged by being led to the cooling fin side provided in. The pumped liquid subjected to heat exchange is discharged to the outside from the side of the heat exchanger.
According to this technique, the pumped liquid containing earth and sand and sludge can be used as the secondary refrigerant, and earth and sand and sludge do not accumulate in the water jacket.

JP 2002-310088 A

In the above conventional technique, the following problems remain.
That is, when a conventional submersible motor-driven pump is applied to sewage containing various kinds of contaminants, when sewage used as cooling water passes through the gap between the rear surface of the impeller and the inner wall of the pump casing, Contaminants contained in the heat exchanger may be bitten or the cooling fins of the heat exchanger may be clogged with contaminants, which may cause problems in cooling the submersible motor and in operating the pump.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an underwater motor-driven pump capable of suppressing troubles in operation due to foreign substances contained in sewage.

  The present invention employs the following configuration in order to solve the above problems. That is, the submersible motor-driven pump according to the first invention is installed on a pump casing in which an impeller is rotatably housed, a heat exchanger provided above the pump casing, and the heat exchanger. A submersible motor that rotationally drives the impeller fixed to a rotating shaft, and the pump casing is provided on a front surface side of the impeller and on a rear surface side of the impeller. An inflow chamber that communicates with the suction flow path, a heat exchange chamber is provided between the pump casing and the heat exchanger, and a portion that communicates the inflow chamber and the heat exchange chamber A crushing mechanism is provided for crushing impurities contained in the fluid.

  In the submersible motor-driven pump according to the present invention, a crushing mechanism for crushing impurities contained in the fluid is provided at a portion where the inflow chamber communicates with the heat exchange chamber, so that the fluid flows from the inflow chamber to the heat exchange chamber. In doing so, the impurities contained in the fluid are crushed by the crushing mechanism, and the refined impurities are discharged into the heat exchange chamber. Therefore, foreign matter is caught in the gap between the back surface of the impeller and the inner wall of the pump casing, the cooling fins of the heat exchanger exposed in the heat exchange chamber are closed with foreign matter, or the foreign matter is Can be prevented from being entangled, and cooling of the submersible motor and operation of the pump can be continued normally.

The submersible motor-driven pump according to a second aspect of the present invention is the submersible motor-driven pump according to the first aspect, wherein the crushing mechanism is disposed on the back surface of the impeller so as to extend from the inner peripheral side toward the outer peripheral side. An annular member that is substantially the same diameter as the outer diameter of the impeller and has a gap between the rear surface of the impeller and fixed to the pump casing; and an annular member that is provided on the annular member and extends from the inner peripheral side toward the outer peripheral side. A plurality of grooves disposed opposite to the back blades, and the annular member vertically divides the inflow chamber and the heat exchange chamber, and the inflow chamber is disposed radially outside the annular member. And the heat exchange chamber communicate with each other.
In other words, in this submersible motor-driven pump, the crushing mechanism includes a plurality of back blades and a plurality of grooves provided on the annular member and arranged to face the back blades. When passing through the groove, the crushing action of the foreign matters can be caused by the cooperation of the back blade and the groove.
In addition, the annular member partitions the inflow chamber and the heat exchange chamber up and down, and the inflow chamber and the heat exchange chamber communicate with each other on the radially outer side of the annular member. The gap between the annular member and the rear surface of the impeller flows from the inside to the outside, reliably passes through the crushing mechanism, and impurities are crushed. Further, the fluid swirls from the radially outer side of the annular member to the heat exchange chamber. And discharged.

The submersible motor-driven pump according to a third aspect of the present invention is the submersible motor-driven pump according to the second aspect, wherein the back blade is disposed with the outer peripheral side set back from the inner peripheral side with respect to the rotational direction of the impeller. The groove portion is arranged so that the back blade and the groove portion obliquely intersect on a horizontal projection plane during rotation.
That is, in this submersible motor-driven pump, the back blade is disposed with the outer peripheral side retracted from the inner peripheral side with respect to the rotation direction of the impeller, and the back blade and the groove portion are connected to each other during rotation. Since it is arranged to cross diagonally on the horizontal projection plane, the time for the back blade and the groove to intersect (the time from the start of the intersection to the end of the intersection) becomes longer, and the impurities can be crushed efficiently. Can do.

The submersible motor-driven pump according to a fourth invention is characterized in that, in the third invention, all of the back blades are arranged so as to always intersect with any of the groove portions on a horizontal projection plane.
That is, in this submersible motor-driven pump, since all of the back blades always intersect with one of the grooves on the horizontal projection plane, the back blades always intersect with the grooves during rotation, so that impurities can pass through. It is possible to reduce the frequency of the crushing and improve the crushing efficiency of the contaminants.

A submersible motor-driven pump according to a fifth invention is the submersible motor-driven pump according to any one of the first to fourth inventions, wherein the flow direction of the fluid flowing into the heat exchange chamber from the radially outer side of the annular member is changed to the heat exchange. A guide member for conversion to the center side of the chamber is provided in the heat exchange chamber.
That is, in this submersible motor-driven pump, a guide member that converts the flow direction of the fluid that has flowed into the heat exchange chamber from the radially outer side of the annular member to the center side of the heat exchange chamber is provided in the heat exchange chamber. Therefore, the velocity energy of the swirling flow is converted into pressure energy by the guide member and the fluid is pressurized, so that a decrease in the flow rate of the fluid due to pressure loss is suppressed on the downstream side of the guide member, and heat exchange with the heat exchanger is performed. It can suppress that efficiency falls.

A submersible motor driven pump according to a sixth invention is the submersible motor driven pump according to the fifth invention, wherein the submersible motor driven pump is disposed in the heat exchange chamber on the downstream side of the guide member with the upper surface facing the heat exchanger and passes through the guide member. A flow rate adjusting member that converts the flow of the fluid into a flow toward the outer peripheral side of the heat exchange chamber, the flow rate adjusting member having a center hole through which the fluid that has passed through the guide member flows, The inner diameter of the hole is a substantially inverted conical shape that gradually expands upward, and the cross-sectional area in the radial direction of the flow path formed between the flow rate adjusting member and the heat exchanger is set to be approximately equal. It is characterized by being.
That is, in this submersible motor-driven pump, the inner diameter of the center hole of the flow rate adjusting member has a substantially inverted conical shape that gradually expands upward, and the flow path formed between the flow rate adjusting member and the heat exchanger Since the flow path cross-sectional areas in the radial direction are set to be approximately equal, the flow velocity in the flow path can be equalized and the occurrence of short-circuit flow can be prevented, and heat exchange with the heat exchanger can be efficiently performed. It can be carried out.

The present invention has the following effects.
That is, according to the submersible motor-driven pump of the present invention, the crushing mechanism for crushing impurities contained in the fluid is provided in the portion that communicates the inflow chamber and the heat exchange chamber. When the fluid circulates, the impurities contained in the fluid can be crushed by a crushing mechanism and refined.
Therefore, in the submersible motor driven pump of the present invention, it is possible to prevent troubles in operation due to foreign matters, and it is possible to normally continue cooling of the submersible motor and operation of the pump.

In 1st Embodiment of the submersible motor drive type pump which concerns on this invention, it is the front view which fractured | ruptured the lower part from the heat exchanger. In 1st Embodiment, it is an expanded sectional view of the principal part. It is AA arrow sectional drawing of FIG. It is a BB arrow directional cross-sectional view of FIG. In 2nd Embodiment of the submersible motor drive pump which concerns on this invention, it is sectional drawing in the same position as FIG. 3 of 1st Embodiment. In 3rd Embodiment of the submersible motor drive type pump which concerns on this invention, it is the front view which fractured | ruptured the lower part from the heat exchanger. In 3rd Embodiment, it is an expanded sectional view of the principal part. It is CC sectional view taken on the line of FIG.

  Hereinafter, a first embodiment of a submersible motor-driven pump according to the present invention will be described with reference to FIGS. 1 to 4.

As shown in FIGS. 1 and 2, the submersible motor-driven pump 1 of the present embodiment includes a pump casing 2 in which an impeller 8 is rotatably housed, and a heat exchanger 3 provided above the pump casing 2. And an underwater motor 4 that rotationally drives an impeller 8 that is installed on the heat exchanger 3 and fixed to the rotary shaft 7.
The impeller 8 is provided with a plurality of impeller blades 21, 21.

The pump casing 2 has a fluid suction passage 9 provided on the front surface side of the impeller 8 and an inflow chamber 10 provided on the back surface side of the impeller 8 and communicating with the suction passage 9. The suction flow path 9 is a fluid flow path upstream from the inlet-side tips of the impeller blades 21 and 21.
In addition, a heat exchange chamber 6 is provided between the pump casing 2 and the heat exchanger 3, and a crushing mechanism that crushes impurities contained in the fluid in a portion where the inflow chamber 10 and the heat exchange chamber 6 communicate with each other. 17 is provided.

The crushing mechanism 17 includes a plurality of back blades 12 extending and arranged on the back surface of the impeller 8 from the inner peripheral side toward the outer peripheral side, and the impeller 8 having the same diameter as the outer diameter of the impeller 8. An annular member 14 that is fixed to the pump casing 2 with a back surface and a gap, and a plurality of grooves 13 that are provided on the annular member 14 and extend from the inner peripheral side toward the outer peripheral side and are arranged to face the back blade 12. It has.
The annular member 14 partitions the inflow chamber 10 and the heat exchange chamber 6 up and down, and the inflow chamber 10 and the heat exchange chamber 6 communicate with each other on the radially outer side of the annular member 14.

As shown in FIG. 3, the back blade 12 is arranged with the outer peripheral side set back from the inner peripheral side with respect to the rotation direction of the impeller 8, and the back blade 12 and the groove portion 13 are rotated when the rear blade 12 and the groove portion 13 are rotated. 13 are arranged so as to cross obliquely on the horizontal projection plane.
Further, as shown in FIG. 4, a plurality of guide members 15 that convert the flow direction of the fluid flowing into the heat exchange chamber 6 from the radially outer side of the annular member 14 to the center side of the heat exchange chamber 6 include the heat exchange chamber. 6 is provided. The guide member 15 is a plate-like member that extends from the inner peripheral side to the outer peripheral side and has a horizontal cross section that is substantially linear. The outer peripheral side ends of these guide members 15 have a shape projecting in the direction opposite to the direction of travel of the swirl flow.

In the submersible motor-driven pump 1, a submersible motor 4 including a heat exchanger 3 is integrally provided above the pump casing 2. A cooling jacket 5 is provided on the outer periphery of the submersible motor 4, and the primary refrigerant is circulated with the heat exchanger 3 to cool the submersible motor 4.
A heat exchange chamber 6 is formed between the pump casing 2 and the heat exchanger 3, and the impeller 8 is disposed at the lower end of the rotary shaft 7 that extends from the submersible motor 4 through the heat exchange chamber 6 into the pump casing 2. Is fixed.

The surface of the impeller 8 faces the suction flow path 9 of the pump casing 2, and an inflow chamber 10 is formed on the back surface of the impeller 8, and is drilled in the impeller 8 upstream from the inlet end of the impeller blade 21. The inflow chamber 10 and the suction passage 9 are communicated with each other through the communication holes 11 and 11.
On the outer peripheral side of the back surface of the impeller 8, a back blade 12 having a plate shape and a substantially straight horizontal cross section is disposed with the outer peripheral side set back from the inner peripheral side with respect to the rotational direction of the impeller 8. Specifically, the back blade 12 is disposed such that the outer peripheral side is set back by an angle α from the inner peripheral side with respect to the rotational direction. Since the outer peripheral side of the back blade 12 is disposed so as to recede from the inner peripheral side, a strong centrifugal pump action is generated by the back blade 12.

An annular member 14 having a diameter substantially the same as the outer diameter of the impeller 8 and having a plurality of slot-like grooves 13 formed on the outer peripheral side is disposed in parallel with the rear surface of the impeller 8.
An appropriate gap d is provided between the annular member 14 and the rear surface of the impeller 8, and the inflow chamber 10 and the heat exchange chamber 6 are vertically partitioned by the annular member 14.
The annular member 14 is fixed to the pump casing 2 via a plurality of guide members 15 and a support member 16.

  The groove portion 13 of the annular member 14 is formed such that the length direction of the outer circumferential side is set back from the inner circumferential side by an angle β with respect to the rotational direction of the impeller 8. For this reason, the rotating back blade 12 obliquely intersects the stationary groove portion 13, and when the back blade 12 passes through the groove portion 13, a crushing action due to the cooperation of the back blade 12 and the groove portion 13 occurs. Therefore, the crushing mechanism 17 is configured by the annular member 14, the rotating back blade 12, and the stationary groove portion 13, and the inflow chamber 10 and the heat exchange chamber 6 are communicated with each other via the crushing mechanism 17.

Next, the operation of the submersible motor-driven pump 1 of the present embodiment will be described.
First, when the operation of the submersible motor-driven pump 1 is started and the impeller 8 fixed to the rotating shaft 7 of the submersible motor 4 rotates, dirty water (fluid) is sucked from the suction port 18 of the pump casing 2, and the suction flow path 9 is discharged to the outside through the discharge channel 19.
At this time, part of the sewage flows into the inflow chamber 10 from the suction passage 9 through the communication holes 11 and 11. At the same time, due to the centrifugal pump action of the rotating back blade 12, the sewage in the inflow chamber 10 flows through the gap d between the annular member 14 and the rear surface of the impeller 8 from the inside to the outside as indicated by the arrow Y, and the crushing mechanism 17 is discharged into the heat exchange chamber 6 as a swirling flow.

  When the sewage passes through the crushing mechanism 17, large impurities are crushed and refined by the rotating back blade 12 and the groove 13. As shown in FIG. 4, the sewage discharged into the heat exchange chamber 6 as a swirl flow is converted into a flow from the outer peripheral side of the heat exchange chamber 6 toward the center side by the guide member 15, and the swirl flow The velocity energy is converted into pressure energy to increase the pressure, flow through the central opening of the support member 16 toward the outer peripheral side of the heat exchange chamber, and heat exchange with the heat exchanger 3 is performed. The heat-exchanged sewage is discharged from the outlets 20 and 20 to the outside.

  As described above, in the submersible motor-driven pump 1, the crushing mechanism 17 that crushes impurities contained in the fluid is provided at the portion where the inflow chamber 10 and the heat exchange chamber 6 communicate with each other. When the fluid flows into the chamber 6, the impurities contained in the fluid are crushed by the crushing mechanism 17, and the refined impurities are discharged into the heat exchange chamber 6. Accordingly, foreign substances are caught in the gap between the back surface of the impeller 8 and the inner wall of the pump casing 2, the cooling fins of the heat exchanger 3 exposed in the heat exchange chamber 6 are clogged with foreign substances, An object can be prevented from being entangled with the rotating shaft 7, and the cooling of the submersible motor 4 and the operation of the pump can be normally continued.

Moreover, since the crushing mechanism 17 includes a plurality of back blades 12 and a plurality of groove portions 13 provided on the annular member 14 and arranged to face the back blades 12, the back blades 12 are formed on the horizontal projection plane. When passing through, the colliding action of the foreign matters can be caused by the cooperation of the back blade 12 and the groove 13.
In addition, the annular member 14 divides the inflow chamber 10 and the heat exchange chamber 6 in the vertical direction, and the inflow chamber 10 and the heat exchange chamber 6 communicate with each other outside the annular member 14 in the radial direction. The centrifugal pump action causes the fluid to flow from the inside toward the outside through the gap d between the annular member 14 and the rear surface of the impeller 8, and reliably passes through the crushing mechanism 17 to crush the contaminants. 14 is discharged from the outside in the radial direction into the heat exchange chamber 6 as a swirling flow.

  Further, the rear blade 12 is disposed with the outer peripheral side set back from the inner peripheral side with respect to the rotation direction of the impeller 8, and the rear blade 12 and the groove portion 13 are horizontally projected when rotating. Since it is arranged in an obliquely intersecting manner on the surface, the time during which the back blade 12 and the groove 13 intersect (the time from the start of the intersection to the end of the intersection) becomes longer, and the impurities can be crushed efficiently. Can do.

  Further, since the guide member 15 that converts the flow direction of the fluid flowing into the heat exchange chamber 6 from the radially outer side of the annular member 14 to the center side of the heat exchange chamber 6 is provided in the heat exchange chamber 6, the guide The member 15 converts the velocity energy of the swirling flow into pressure energy and pressurizes the fluid, thereby suppressing a decrease in the flow rate of the fluid due to pressure loss on the downstream side of the guide member 15 and exchanging heat with the heat exchanger 3. It can suppress that efficiency falls.

  Next, second and third embodiments of the submersible motor-driven pump according to the present invention will be described below with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same component demonstrated in the said embodiment, and the description is abbreviate | omitted.

  The difference between the second embodiment and the first embodiment is that in the first embodiment, there is a position where the back blade 12 and the groove 13 do not intersect on the horizontal projection plane depending on the position at the time of rotation. In the submersible motor-driven pump of the embodiment, as shown in FIG. 5, the groove portion 25 of the annular member 14 is formed such that the outer peripheral side advances from the inner peripheral side with respect to the rotation direction of the impeller 8, and a plurality of back surfaces are formed. All of the blades 26 are arranged so as to always intersect with any of the groove portions 25 on the horizontal projection plane.

  As described above, in the submersible motor-driven pump according to the second embodiment, all the back blades 12 are always arranged so as to intersect with any one of the groove portions 13 on the horizontal projection plane in the crushing mechanism 27. The frequency with which the blade 12 crosses the groove 13 and the contaminants pass through can be reduced, and the crushing efficiency of the contaminants can be improved.

  Next, the difference between the third embodiment and the first embodiment is that, in the first embodiment, a plurality of guide members 15 are provided in the heat exchange chamber 6, whereas the submersible motor of the third embodiment. As shown in FIGS. 6 to 8, the drive pump 41 is provided with a flow rate adjusting member 31 in addition to the guide member 30 in the heat exchange chamber 6.

That is, in the submersible motor-driven pump 41 of the third embodiment, the flow of fluid that has been disposed in the heat exchange chamber 6 on the downstream side of the guide member 30 with the upper surface facing the heat exchanger 3 and has passed through the guide member 30. Is converted to a flow toward the outer peripheral side of the heat exchange chamber 6.
The flow rate adjusting member 31 has a center hole 31a through which the fluid that has passed through the guide member 30 flows, and has a substantially inverted conical shape in which the inner diameter of the center hole 31a gradually expands upward. The channel cross-sectional areas in the radial direction of the channels formed between the exchanger 3 are set to be approximately equal.

A plurality of guide members 30 are disposed on the top surface of the annular member 14, and an annular upper plate 33 having an opening 32 provided on the upper end surface of the guide member 30 is disposed. That is, the upper and lower ends of the guide member 30 are closed by the annular member 14 and the upper plate 33.
The guide member 30 is a plate-like member formed in a horizontal cross-section arc shape. These guide members 30 are formed in a convex arc shape toward the traveling direction of the swirl flow.
Surrounding the opening 32 of the upper plate 33, the lower end of the tubular member 34 is joined to the upper plate 33, the upper end of the tubular member 34 is joined to the support member 16, and the support member 16 communicates with the tubular member 34. A flow rate adjusting member 31 is joined.

  The flow rate adjusting member 31 has a substantially conical shape whose diameter increases upward, and an enlarged surface thereof is disposed to face the heat exchanger 3. The diameter of the flow rate adjusting member 31 is rapidly increased toward the upper side, and as described above, the radius of the sewage (fluid) flowing through the gap between the flow rate adjusting member 31 and the heat exchanger 3 from the central side toward the outer peripheral side. The cross-sectional areas in the direction are formed to be substantially equal.

  In the third embodiment, as shown in FIG. 8, the sewage (fluid) discharged from the crushing mechanism 37 as a swirling flow into the heat exchange chamber 6 is disposed between the annular member 14 and the upper plate 33. The swirling flow is converted into a flow from the outer peripheral side of the heat exchange chamber 6 toward the central side by the guide member 30. At this time, the velocity energy of the swirl flow is converted into pressure energy to increase the pressure, and the sewage passes through the cylindrical member 34 from the opening 32 and between the flow rate adjusting member 31 and the heat exchanger 3 in the heat exchange chamber. 6 flows toward the outer peripheral side, and heat exchange between the sewage and the heat exchanger 3 is performed. The heat-exchanged sewage is discharged from the outlets 20 and 20 to the outside.

As described above, in the submersible motor-driven pump 41 according to the third embodiment, the inner diameter of the center hole 31a of the flow rate adjusting member 31 is formed in a substantially inverted conical shape that gradually increases upward, and the flow rate adjusting member 31 and the heat exchanger 3 The cross-sectional area in the radial direction of the flow path formed between the two is set to be substantially equal, so that the flow velocity in the flow path can be equalized and the occurrence of short-circuit flow can be prevented, Heat exchange with the exchanger 3 can be performed efficiently.
Note that a guide plate may be provided on the enlarged surface of the flow velocity adjusting member 31 to further equalize the flow velocity.

In addition, this invention is not limited to said each embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in each of the above embodiments, the back blade and the groove are both formed in a straight line shape, but are not limited to a straight line shape, and the back blade and the groove portion may be formed in a curved shape appropriately curved.

  DESCRIPTION OF SYMBOLS 1,41 ... Submersible motor drive type pump, 2 ... Pump casing, 3 ... Heat exchanger, 4 ... Submersible motor, 6 ... Heat exchange chamber, 7 ... Rotating shaft, 8 ... Impeller, 9 ... Suction flow path, 10 ... Inflow chamber, 12 ... back blade, 13 ... groove, 15, 30 ... guide member, 14 ... annular member, 17, 27, 37 ... crushing mechanism, 31 ... flow rate adjusting member

Claims (3)

A pump casing in which an impeller is rotatably housed;
A heat exchanger provided above the pump casing;
A submersible motor that rotationally drives the impeller installed on the heat exchanger and fixed to a rotating shaft;
The pump casing is a fluid suction passage provided on the surface side of the impeller, and
An inflow chamber provided on the back side of the impeller and in communication with the suction flow path;
A heat exchange chamber is provided between the pump casing and the heat exchanger, and a crushing mechanism for crushing impurities contained in the fluid is provided at a portion communicating the inflow chamber and the heat exchange chamber. ,
The crushing mechanism has a plurality of back blades extending and arranged on the back surface of the impeller from the inner peripheral side toward the outer peripheral side, and the back surface of the impeller having the same diameter as the outer diameter of the impeller. An annular member that is fixed to the pump casing with a gap, and a plurality of groove portions that are provided on the annular member and extend from the inner peripheral side toward the outer peripheral side and are arranged to face the back blades,
The annular member divides the inflow chamber and the heat exchange chamber vertically, and the inflow chamber and the heat exchange chamber communicate with each other on the radially outer side of the annular member,
The back blade is disposed with the outer peripheral side set back from the inner peripheral side with respect to the rotational direction of the impeller,
The groove is formed such that the outer peripheral side advances from the inner peripheral side with respect to the rotational direction of the impeller,
The submersible motor-driven pump, wherein the back blade and the groove portion are arranged so as to obliquely intersect on a horizontal projection surface during rotation . The submersible motor-driven pump according to claim 1 ,
The submersible motor-driven pump, wherein all the back blades are arranged so as to always intersect with any one of the groove portions on a horizontal projection plane. A pump casing in which an impeller is rotatably housed;
A heat exchanger provided above the pump casing;
A submersible motor that rotationally drives the impeller installed on the heat exchanger and fixed to a rotating shaft;
The pump casing is a fluid suction passage provided on the surface side of the impeller, and
An inflow chamber provided on the back side of the impeller and in communication with the suction flow path;
A heat exchange chamber is provided between the pump casing and the heat exchanger, and a crushing mechanism for crushing impurities contained in the fluid is provided at a portion communicating the inflow chamber and the heat exchange chamber. ,
A guide member that converts the flow direction of the fluid that has flowed into the heat exchange chamber from the radially outer side of the annular member to the center side of the heat exchange chamber is provided in the heat exchange chamber,
The upper surface side of the heat exchange chamber on the downstream side of the guide member is disposed to face the heat exchanger, and the flow of the fluid that has passed through the guide member is converted into a flow toward the outer peripheral side of the heat exchange chamber. Equipped with a flow rate adjusting member,
The flow rate adjusting member has a central hole through which the fluid that has passed through the guide member flows, and the inner diameter of the central hole gradually increases upward, and has a substantially inverted conical shape.
A submersible motor-driven pump, characterized in that a flow path cross-sectional area in a radial direction of a flow path formed between the flow rate adjusting member and the heat exchanger is set to be substantially equal.

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