JP2007143888A - Liquid circulation pump device directly mounted to bathtub - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid circulation pump device directly mounted to a bathtub, which is capable of relatively easily removing hair from a suction port again even if the hair of a bather is sucked from within the bathtub via the suction port when driving a pump. <P>SOLUTION: A pump device 15 is directly mounted on the outer face of a side wall 12 of a bathtub 11, the inside of an impeller storage chamber 35 formed in a casing 17 of the pump device 15 and the suction port 13 facing the inside of the bathtub 11 and provided in the side wall 12 of the bathtub 11 are connected by a suction-side channel including a suction-side tube part 18 and a channel formation chamber 33, which are integrally formed at the casing 17. The inside of channel formation chamber 33 is provided with a spiral wall 39 using a communication hole 37 as a center, which corresponds to the rotation axis P of the impeller 36 rotating in an impeller storage chamber 35, and an extension channel part 41 for increasing the whole length of the suction-side channel is formed along a spiral wall 39. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a directly-attached bathtub type liquid circulation pump that sucks liquid stored in a bathtub from a suction port facing the bathtub based on pump driving and discharges it from a discharge port facing the bathtub at a position different from the suction port. Relates to the device.

Conventionally, as this kind of bathtub direct-attached liquid circulation pump device, for example, an electric bubble generator for bathtubs (hereinafter referred to as “conventional pump device”) described in Patent Document 1 is known. In this conventional pump device, an impeller accommodating chamber for accommodating an impeller that rotates based on driving of a pump motor is formed in a pump casing that is directly attached to the outer surface of the side wall of the bathtub. The suction port that faces the inside of the bathtub is connected via a suction-side flow channel, and is connected to the discharge port that faces the bathtub at a position different from the suction port via the discharge-side flow channel. And when the impeller arrange | positioned in an impeller accommodation chamber rotates based on the drive of a pump motor, the bath water (liquid) in a bathtub passes through a suction side flow path from a suction port, and the impeller accommodation chamber of a pump casing And is discharged from the discharge port into the bathtub through the discharge side flow path.
JP-A-9-276162 (FIG. 3)

  By the way, at the suction port facing the bathtub, when the bather's hair is long, the bather's hair is prevented from being sucked from the suction port into the liquid circulation pump device (especially in the suction side channel). In view of this, a suction port cover having a filter function is usually attached. However, such a suction port cover may be removed from the suction port for cleaning maintenance by the user. In such a case, the user has forgotten to attach the suction port cover once removed after maintenance. It is possible that the hot water is put in the bathtub and the pump is driven. Even if the suction port cover is attached, it cannot be said that if the mesh of the suction port cover is rough, the hair will not be sucked into the pump device through the suction port cover.

  In such a case, in the conventional pump device, the suction side flow path connecting the suction port and the impeller housing chamber of the pump casing is bent to meet the demand for compactness, and the length of the suction side flow path is Therefore, the hair sucked from the suction port may be sucked deep into the suction-side flow path, for example, into the impeller housing chamber. Further, even if the air is not sucked into the impeller housing chamber, the hair may be entangled with the eddy current generated by the rotation of the impeller inside the suction side flow path to form a lump. Therefore, once the bather's hair is drawn into the bathtub direct-mounted liquid circulation pump device from the suction port, the bather draws the hair again from the suction port even if the pump is stopped. There was a problem that it became difficult.

  The present invention has been made in view of such circumstances, and its purpose is to relatively easily remove the hair of the bather from the suction port even if the hair of the bather is sucked from the bathtub through the suction port when the pump is driven. An object of the present invention is to provide a bath direct-mounted liquid circulation pump device that can be pulled out again.

  In order to achieve the above-mentioned object, the invention according to claim 1 relating to a bathtub direct-mounted liquid circulation pump device is characterized in that a pump casing is directly attached to an outer surface of a side wall of the bathtub, and the pump casing is driven based on driving of a pump drive source. By rotating the impeller disposed in the impeller housing chamber, the liquid stored in the bathtub is sucked into the impeller housing chamber from the suction port facing the bathtub through the suction side flow path, and In the bathtub direct-mounted liquid circulation pump device that sends out from the impeller housing chamber to the discharge port facing the inside of the bathtub at a position different from the suction port through the discharge side flow path, and discharges into the bathtub from the discharge port. The suction-side flow path has an extended flow path part in the middle of the flow path that makes the total length of the flow path longer than when the suction port and the impeller housing chamber are connected in a bent shape. This is the gist.

  According to a second aspect of the present invention, in the bathtub direct-attached liquid circulation pump device according to the first aspect, the extension flow path portion is formed of the suction side flow path in an occupied space in a plan view of the pump casing. The gist of the present invention is that it has a channel shape that extends the entire length of the channel.

  A third aspect of the present invention is the bathtub direct-mounted liquid circulation pump device according to the first or second aspect, wherein the extended flow path portion has a spiral shape. And

  The invention according to claim 4 is the bathtub direct-mounted liquid circulation pump device according to any one of claims 1 to 3, wherein the pump casing is when the pump drive source is driven. The liquid flow direction upstream further communicates with the suction port, while the downstream side further has a flow path forming chamber communicated with the impeller housing chamber, and the extended flow path portion is provided in the flow path forming chamber. It is a summary.

  The invention according to claim 5 is the bathtub direct-attached liquid circulation pump device according to claim 4, wherein the flow path forming chamber corresponds to a position of the rotation center of the impeller in a partition wall with the impeller accommodating chamber. The communication hole is formed, and a side opposite to the partition is formed by a lid attached to the pump casing, and the communication hole is centered between the lid and the partition. The gist is that the spiral wall is provided so as to form a spiral extension channel portion.

  A sixth aspect of the present invention is the bathtub direct-mounted liquid circulation pump device according to the fifth aspect, wherein the spiral wall is formed on one of the opposing surfaces of the partition wall and the lid. The gist of the present invention is that a spiral groove into which the spiral wall is inserted when the lid is attached to the pump casing is formed on the other facing surface.

  The invention according to claim 7 is the bathtub direct-mounted liquid circulation pump device according to any one of claims 4 to 6, wherein the extended flow path portion formed in the flow path forming chamber is: The gist of the invention is that it has a downward slope toward a portion communicating with the suction port at least from the middle thereof.

  According to the present invention, even if the bather's hair is sucked from the bathtub through the suction port when the pump is driven, it can be pulled out from the suction port with relative ease.

  Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. In the following description of the present specification, the “vertical direction” indicates the vertical direction in FIG. 1 (indicated by arrows in the figure).

  As shown in FIG. 1, in the side wall 12 of the bathtub 11 in the present embodiment, the suction port 13 and the discharge port 14 are arranged in such a manner that the discharge port 14 is above the suction port 13. It is provided so as to face. Only one suction port 13 is provided, and two discharge ports 14 are provided at regular intervals in the left-right direction orthogonal to the paper surface of FIG. 1 (only one discharge port 14 is shown in FIG. ). On the outside of the side wall 12 of the bathtub 11, the bath water (liquid) W stored in the bathtub 11 is sucked from the suction port 13 based on the pump drive and pressurized, and then the bath water W mixed with bubbles is formed. A pump device 15 for discharging from the discharge port 14 into the bathtub 11 is installed.

  As shown in FIGS. 1 and 2, the pump device 15 includes a motor 16 as a pump drive source connected to a power source (not shown) via an electric wire 16 a, and is fixed to the lower side of the motor 16 via a connecting member 17 a. A substantially cylindrical pump casing (hereinafter referred to as “casing”) 17 is provided. A straight tubular suction side pipe portion 18 protrudes laterally from the lower side surface (the left side surface in FIG. 1) of the casing 17, and the tip of the suction side pipe portion 18 is connected to the suction port 13 of the bathtub 11. . In addition, connecting pipes 17b (see FIG. 3) are protruded laterally from two locations on the upper side surface of the casing 17, and a discharge side pipe portion 19 that is bent at the tip of these connecting pipes 17b faces upward. It is connected to extend. And the one end of the bent discharge joint 20 which comprises a discharge side flow path with the discharge side pipe part 19 and the said connecting pipe 17b is connected to the upper end of this discharge side pipe part 19, and the other end of the discharge joint 20 Is connected to the outlet 14 of the bathtub 11.

  In addition, from the middle of the discharge joint 20, a cylindrical air suction portion 21 extends upward. The air suction portion 21 has a distal end opening 21 a that is open to the outside air, and a proximal end side that is in communication with the discharge joint 20, and is driven from the discharge side pipe portion 19 side into the discharge joint 20 as the motor 16 is driven. When the bath water W passes toward the discharge port 14 side, the outside water taken from the tip opening 21a into the discharge joint 20 is mixed into the bath water W to generate the bath water W mixed with bubbles. Has come to fulfill.

Next, a connection mode of the suction side pipe portion 18 of the casing 17 to the suction port 13 of the bathtub 11 will be described.
As shown in FIG. 2, a through hole 22 having a diameter substantially the same as the suction side pipe portion 18 of the casing 17 in the pump device 15 is formed at a position where the suction port 13 is provided in the lower portion of the side wall 12 of the bathtub 11. A substantially cylindrical suction side bolt 23 which is a main component of the suction port 13 is inserted into the through hole 22. A flange portion 24 having a diameter larger than the diameter of the through hole 22 is formed on the outer peripheral surface of the suction side bolt 23 from the base end side (the side located in the bathtub 11 when being inserted into the through hole 22). Is formed. Further, a male screw portion 25 is formed on the outer peripheral surface of the suction side bolt 23 from the middle to the front end side (the side that protrudes out of the bathtub 11 when being inserted into the through hole 22).

  On the other hand, on the inner peripheral surface of the suction side pipe part 18 in the casing 17 of the pump device 15, a female thread part 26 having a threaded relationship with the male thread part 25 of the suction side bolt 23 is formed, and the suction side pipe part 18. A flange portion 27 is formed at the tip of the. The casing 17 is screwed into the male threaded portion 25 of the suction side bolt 23 that is inserted into the through hole 22 of the side wall 12 from the inside of the bathtub 11, The suction side pipe portion 18 is connected to the suction port 13 while being directly attached to the outer surface of the side wall 12 of the bathtub 11. Thus, the pump device 15 of the present embodiment is configured as a bathtub direct-attached circulation pump device by directly attaching the casing 17 to the outer surface of the side wall 12 of the bathtub 11.

  In this case, packing 28 is provided between the flange portion 24 of the suction side bolt 23 and the inner surface of the side wall 12 of the bathtub 11 and between the flange portion 27 of the suction side pipe portion 18 and the outer surface of the side wall 12 of the bathtub 11 in the casing 17. Is interposed. In addition, an inner cover 30 having a filter function is crowned on the proximal-side opening 23a projecting into the bathtub 11 of the suction-side bolt 23 in a state of being inserted into the through-hole 22 of the side wall 12, and the inner cover 30 is crowned inside the The cover 30 is fastened and fixed to the base end portion of the suction side bolt 23 by screws 31. An outer cover 32 having a filter function is detachably attached to the outer side of the inner cover 30. That is, the inner cover 30 and the outer cover 32 prevent foreign substances such as hair from being sucked into the casing 17 of the pump device 15 together with the bath water W when the pump is driven.

Next, a specific configuration of the casing 17 will be described.
As shown in FIGS. 2 to 4, a flow path forming chamber 33 into which the bath water W flows from the suction port 13 through the suction side pipe portion 18 when the pump is driven is formed in the casing 17. An impeller housing chamber 35 is formed above the flow path forming chamber 33 via a partition wall 34, and an impeller 36 attached to the output shaft 16 b of the motor 16 rotates in the impeller housing chamber 35. Contained in a possible state. A communication hole 37 for communicating the flow path forming chamber 33 and the impeller accommodating chamber 35 is formed in the partition wall 34 so as to correspond to the rotational center P of the impeller 36.

  In addition, the flow path forming chamber 33 is configured by a lid body 38 whose side facing the partition wall 34 in the vertical direction (lower side in FIG. 2) is attached to the casing 17 from below. A spiral wall 39 centering on the communication hole 37 is provided between the body 38 and the partition wall 34. That is, as shown in FIGS. 2 to 4, the spiral wall 39 is formed so as to hang downward from the facing surface 34 a of the partition wall 34 with respect to the lid 38.

  As shown in FIG. 5, the spiral wall 39 has the longest downward projecting length in the spiral shape at a portion (“i-ha” portion in FIGS. 3 and 5) close to the suction side pipe portion 18. In the portion located on the center side from the middle of the spiral shape (portion “To” in FIGS. 3 and 5), the downward protruding length is formed to be the shortest. And in the intermediate part which connects between these two parts (the part of "To" in FIG. 3, FIG. 5), the downward protrusion length of the spiral wall 39 goes to the center side (namely, communication hole 37 side). It is configured to become gradually shorter. FIG. 5 shows a change in the protruding length of the spiral wall 39 from the facing surface 34 a of the partition wall 34.

  On the other hand, as shown in FIGS. 2, 6, and 7, a spiral groove 40 having a fitting relationship with the spiral wall 39 on the casing 17 side is formed on the facing surface 38 a of the lid body 38 with respect to the partition wall 34. ing. The facing surface 38a of the lid 38 is a portion close to the suction side pipe portion 18 when the lid 38 is attached to the casing 17 ("B" in FIGS. 2, 6 to 8). ) Is the lowest in the vertical direction, and the portion located on the center side of the lid body 38 (the “to-wa” portion in FIGS. 6 and 8) is the highest in the vertical direction. And in the intermediate part which connects between these two parts (the part of "Ro" in FIG. 6, FIG. 8), the height of the opposing surface 38a of the cover body 38 in the perpendicular direction is the said suction | inhalation along the spiral groove 40. It is formed so as to have a downward slope toward a portion close to the side tube portion 18 (portion “B” in FIGS. 6 to 8). FIG. 8 shows a change in the vertical height of the facing surface 38 a from the reference surface 38 b of the lid 38.

  When the flow path forming chamber 33 is formed in the casing 17 by attaching the lid body 38 to the casing 17 from below, a spiral shape is formed in the flow path forming chamber 33 along the spiral wall 39. The extended flow path portion 41 is formed. That is, if the spiral wall 39 is not formed in the flow path forming chamber 33, the suction side flow path constituted by the flow path forming chamber 33 and the suction side pipe portion 18 is bent. Therefore, the total length of the suction side flow path is short. On the other hand, in the case of the present embodiment, since the spiral extended flow path portion 41 is formed in the flow path forming chamber 33, the suction side flow path is more than the bent suction side flow path. The total length of the flow path is increased.

  As shown in FIG. 2, a mounting lid 42 is fastened to the lower side of the lid body 38 via a bolt 43, and a negative pressure operation valve 44 is attached to the mounting lid 42. Yes. One end side (lower end side in FIG. 2) of the negative pressure operating valve 44 communicates with the atmosphere, and the other end side (upper end side in FIG. 2) has an insertion hole 45 (FIG. 6) formed through the lid 38. (See FIG. 6) so as to face the flow path forming chamber 33. That is, in the case of the present embodiment, as shown in FIG. 6, the lid 38 has a portion close to the suction side pipe portion 18 (a portion “B” in FIG. 6) and the rotation center P of the impeller 36. The insertion hole 45 is formed at a substantially intermediate position with respect to the corresponding portion (the portion indicated by “H” in FIG. 6). As a result, the negative pressure operation valve 44 is configured to operate by detecting a negative pressure change in the suction side flow path at a substantially intermediate position of the extension flow path portion 41.

Next, the operation of the pump device 15 of the present embodiment configured as described above will be described.
As shown in FIG. 1, when the user activates the pump device 15 in the state where the bath water W is stored in the bathtub 11, the impeller 36 is rotated by the driving force of the motor 16. Then, the hot water W is sucked into the flow path forming chamber 33 of the casing 17 through the suction side pipe portion 18. Then, the hot water W passes through the extended flow path portion 41 along the spiral wall 39 in the flow path forming chamber 33 and flows into the impeller accommodating chamber 35 from the communication hole 37, and then the impeller 36. Is sent to the discharge side pipe section 19 through the connection pipe 17b.

  Then, the hot water W sent to the discharge side pipe part 19 is further sent to the discharge joint 20, and the outside air taken in from the air suction part 21 is mixed when passing through the discharge joint 20. Then, the hot water W mixed with bubbles is discharged from the discharge port 14 into the bathtub 11. In this manner, while the pump device 15 is pump-driven, the suction of the bath water W from the suction port 13 and the discharge of the bath water W mixed with bubbles from the discharge port 14 are repeated, and the bath water W is stored in the bathtub 11. Between the inside and the pump device 15 (suction side flow path → impeller housing chamber 36 → discharge side flow path).

  Further, during the circulation of the bath water W, foreign matter such as hair adheres to the outer cover 32 (or the inner cover 30) attached to the suction port 13, and the inside of the suction side flow path including the extension flow path portion 41. When the negative pressure increases, the negative pressure operation valve 44 operates, and the outside air is taken into the flow path forming chamber 33 of the casing 17 in the pump device 15. As a result, the pump capacity due to the rotation of the impeller 36 based on the driving force of the motor 16 is reduced, the negative pressure in the suction side flow path is reduced, and the outer cover 32 (or the inner cover 30) at the suction port 13 is reduced. The negative pressure applied to it also decreases. Therefore, foreign matters such as hair attached to the outer cover 32 (or the inner cover 30) from the inside of the bathtub 11 are easily peeled off.

  By the way, the user may remove the outer cover 32 and the inner cover 30 of the suction port 13 during cleaning maintenance of the bathtub 11 or the like. That is, when trying to remove scales or the like adhering to the inside of the suction-side bolt 23, not only the outer cover 32 that is made detachable but also the inner cover 30 may be removed using a tool such as a screwdriver. Then, it is desirable that the removed outer cover 32 and inner cover 30 are attached as they are after the cleaning maintenance is completed. However, the user may cause the pump device 15 to be driven by pumping the hot water W into the bathtub 11 while forgetting to attach the outer cover 32 and the inner cover 30 once removed.

  In such a case, the outer cover 32 and the inner cover 30 are attached to the inlet 13 if the hair of the bather immersed in the bath water W in the bathtub 11 is long enough to hang down below the inlet 13. Therefore, it is relatively easily sucked into the flow path forming chamber 33 of the casing 17 together with the hot water W through the proximal end side opening 23 a of the suction side bolt 23. Here, if the spiral wall 39 is not provided in the flow path forming chamber 33, the hair sucked into the flow path forming chamber 33 is caused by the vortex generated at the position of the rotation center P of the impeller 36. It will be drawn and entangled in a lump at that position. Alternatively, the air is sucked into the impeller accommodating chamber 35 from the communication hole 37 and may be entangled with the impeller 36 in some cases.

  However, in the present embodiment, the entire length of the flow path of the suction side flow path from the suction port 13 to the impeller chamber 35 is increased by the spiral extended flow path portion 41 along the spiral wall 39. For this reason, the hair is preferably suppressed from being drawn to the central portion of the flow path forming chamber 33 (a position directly below the communication hole 37) by the vortex force. In addition, when the hair passes through the spiral extension channel portion 41, the hair sticks to the spiral wall 39 by the flow of the bath water W toward the inside along the spiral wall 39, so that the hair is danced by the water current in the middle of the flow. Thus, the entanglement in a lump is preferably suppressed.

Therefore, in this embodiment, the following effects can be obtained.
(1) The total flow path length of the suction side flow path (suction side pipe section 18 and flow path forming chamber 33) from the suction port 13 facing the bathtub 11 to the impeller housing chamber 35 in the pump device 15 is extended. By providing the flow channel portion 41, the suction side flow channel is secured long unlike the conventional case where the suction side flow channel is bent. For this reason, even if the bather's hair is inhaled together with the bath water W from the suction port 13, such hair is drawn into the vortex generated at the position of the rotation center P of the impeller 36, and the suction side channel It is possible to suppress entanglement in a lump in the inner depth (center portion of the flow path forming chamber 33) or suction into the impeller chamber 35. Therefore, even if the hair of the bather is sucked from the bathtub 11 through the suction port 13 when the pump is driven, it can be pulled out from the suction port 13 relatively easily.

  (2) The extension channel portion 41 that lengthens the entire length of the suction side channel is formed in the casing 17. That is, when the casing 17 is viewed in plan on the outer surface side of the side wall 12 of the bathtub 11, the extended flow path portion 41 is formed within the space occupied by the casing 17 outside the bathtub 11. Therefore, it is possible to suitably lengthen the entire length of the suction side flow path without increasing the installation space of the pump device 15 outside the bathtub 11.

  (3) Since the extended flow path portion 41 that lengthens the overall flow path length of the suction side flow path has a spiral shape, the flow rate of the bath water W that passes through the extended flow path portion 41 is not significantly reduced. . Therefore, the hot water W can be circulated smoothly as the pump is driven.

  (4) Since the extended flow path portion 41 is provided in the flow path forming chamber 33 of the casing 17, for example, when the extended flow path portion 41 is provided in a mounting casing separate from the casing 17. While the attachment casing is attached, the alignment of the extension channel portion 41 with respect to the suction side and the discharge side is troublesome, and such troublesome work can be avoided.

  (5) The extension flow path portion 41 is formed by the spiral wall 39 centered on the communication hole 37 that corresponds to the rotational center P of the impeller 36. Therefore, when the hair passes through the extended flow path portion 41, the hair sticks to the outer surface of the spiral wall 39 by the flow of the bath water W toward the inside along the spiral wall 39. Therefore, it is possible to prevent the hair from being entangled in a lump due to the influence of the eddy current generated at the position of the rotation center P of the impeller 36 when passing through the extended flow path portion 41.

  (6) When the lid body 38 is attached to the casing 17, the spiral wall 39 formed on the casing 17 side is fitted into the spiral groove 40 formed on the lid body 38 side. Therefore, the assembly work of the pump device 15 can be easily performed.

  (7) In a state where the lid body 38 is attached from the lower side of the casing 17, the facing surface 38a of the lid body 38 with respect to the partition wall 34 on the casing 17 side is a communicating portion with the suction port 13 side, that is, the suction side pipe section. 18 is configured such that the portion close to 18 (the portion “b” in FIGS. 6 to 8) is lowest in the vertical direction. Therefore, when the hot water W in the bathtub 11 is dropped from a drain port (not shown) after the pump driving is stopped, the hot water W remaining in the flow path forming chamber 33 is transferred to the suction port 13 side. It can discharge suitably using a downward gradient.

  (8) When foreign matter such as hair adheres to the suction port 13 when the pump is driven and the negative pressure in the suction side flow path (for example, the extended flow path portion 41 in the flow path forming chamber 33) becomes high, the negative pressure By taking the outside air into the suction side flow path by operating the pressure operation valve 44 and reducing the pump capacity, foreign matters such as hair attached to the suction port 13 can be easily peeled off from the inside of the bathtub 11.

  (9) In addition, regarding the mounting position of the negative pressure operating valve 44, the total length of the suction side flow path including the extension flow path portion 41 is increased, so that the position close to the suction port 13 or the impeller 36 is increased. Arbitrary positions such as a position close to the rotation center P and an intermediate position between them can be selected. Therefore, the mounting position of the negative pressure operating valve 44 can be selected in consideration of the load capacity of the motor 16 and the like, and there is an effect that the degree of freedom in design is improved.

The above embodiment may be changed to another embodiment (another example) as follows.
The attachment position of the negative pressure operating valve 44 can be arbitrarily changed by changing the formation position of the insertion hole 45 with respect to the lid 38.

  -The opposing surface 38a with respect to the partition wall 34 of the cover body 38 may be a flat structure, without having a downward gradient on the inlet 13 side. In addition, not the configuration in which only the portion from the middle of the extended flow path portion 41 along the spiral groove 40 to the communication portion with the suction port 13 side is inclined so as to be inclined downward, but the entire extended flow path portion 41 is The structure may be inclined so as to form a downward gradient from the downstream end toward the upstream end.

  -Contrary to the case of the said embodiment, the spiral groove 40 may be formed in the opposing surface 34a of the partition 34 in the casing 17, and the spiral wall 39 may be protruded and formed in the opposing surface 38a with respect to the partition 34 of the cover body 38. FIG. Alternatively, the spiral groove 40 is formed on the opposing surfaces 34 a and 38 a of both the partition wall 34 and the lid body 38, and the spiral wall member formed separately is inserted between the spiral grooves 40 and sandwiched between the partition wall 34 and the lid body 38. You may make it do. Further, the lid body 38 is integrated with the casing 17, and an extension flow path component member having a separate structure in which a flow path forming chamber with a spiral wall is formed inside the casing 17 is inserted. Also good.

In the casing 17, the portion constituting the suction side pipe portion 18 and the flow path forming chamber 33 may be assembled and joined separately from the portion forming the impeller accommodating chamber 35.
The extension channel portion 41 may extend so that the downstream side of the suction side pipe portion 18 forms a spiral shape and is connected to the impeller housing chamber 35 via the communication hole 37. That is, the extension flow path part 41 may be comprised with the spiral tube.

-The extension flow path part 41 may be formed not in a spiral shape in the flow path forming chamber 33 but in, for example, a meandering shape.
-When the installation space of the pump apparatus 15 has room outside the bathtub 11, the extended flow path part 41 may extend to the range exceeding the occupation space in the planar view of the casing 17.

In addition, the technical idea that can be grasped from the above embodiment and other examples will be described below.
An insertion hole is formed in the lid body at an arbitrary position along the flow path direction of the spiral extension flow path portion, and is opened based on a negative pressure change in the suction side flow path through the insertion hole. The bathtub direct-attached type liquid circulation pump device according to any one of claims 5 to 7, further comprising a negative pressure operation valve that allows outside air to flow into the suction-side flow path when the valve is operated.

  According to this technical idea, since the total length of the suction side flow path is long, an arbitrary position can be selected as the attachment position of the negative pressure operation valve, and the degree of design freedom in the pump device is improved.

The schematic front view of the attachment state with respect to the bathtub of the pump apparatus in this embodiment. The expanded sectional view which fractures | ruptures and shows a part of FIG. The bottom view of a casing. FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. Explanatory drawing which shows the change of the protrusion length of a spiral wall. The top view of a cover body. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. Explanatory drawing which shows the height change of the opposing surface of a cover body.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Bathtub, 12 ... Side wall, 13 ... Inlet port, 14 ... Discharge port, 15 ... Pump device (tub direct-mounted circulation pump device), 16 ... Motor (pump drive source), 17 ... Casing (pump casing), 17b ... Connection pipe constituting discharge side flow path, 18... Suction side pipe part constituting suction side flow path, 19... Discharge side pipe part constituting discharge side flow path, 20. , 33 ... a flow path forming chamber constituting the suction side flow path, 34 ... partition wall, 34a ... facing surface, 35 ... impeller housing chamber, 36 ... impeller, 37 ... communication hole, 38 ... lid body, 38a ... facing surface , 39 ... spiral wall, 40 ... spiral groove, 41 ... extension flow path part, 44 ... negative pressure operating valve, 45 ... insertion hole, P ... center of rotation, W ... bath water (liquid).

Claims (7)

The pump casing is directly attached to the outer surface of the side wall of the bathtub, and by rotating the impeller disposed in the impeller housing chamber of the pump casing based on the driving of the pump drive source, the liquid stored in the bathtub is From the suction port facing to the discharge port through the suction side flow channel to the discharge port facing the inside of the bathtub at a position different from the suction port from the impeller storage chamber through the discharge side flow channel In the bathtub direct-attached liquid circulation pump device that discharges into the bathtub from the discharge port,
The suction-side flow path has an extended flow path part in the middle of the flow path that makes the total length of the flow path longer than when the suction port and the impeller housing chamber are connected in a bent shape. Bath direct-mounted liquid circulation pump device. The bathtub direct-mounted liquid circulation according to claim 1, wherein the extended flow path portion has a flow path shape that extends a total length of the flow path of the suction side flow path in an occupied space in plan view of the pump casing. Pump device. The bathtub direct mounting type liquid circulation pump device according to claim 1 or 2, wherein the extension channel portion has a spiral channel shape. The pump casing further includes a flow path forming chamber in which the upstream side in the liquid flow direction when the pump drive source is driven communicates with the suction port, and the downstream side communicates with the impeller housing chamber. The bathtub direct-attached liquid circulation pump device according to any one of claims 1 to 3, wherein the extended flow path portion is provided in the flow path forming chamber. In the flow path forming chamber, a communication hole is formed in a partition wall with the impeller housing chamber so as to correspond to a rotation center of the impeller, and a side facing the partition wall is attached to the pump casing. 5. The structure according to claim 4, comprising a lid body, wherein a spiral wall centering on the communication hole is provided between the lid body and the partition so as to form a spiral extension channel portion. Bath direct-mounted liquid circulation pump device. The spiral wall is formed on one of the opposing surfaces of the partition wall and the lid, and the lid is attached to the pump casing on the other opposing surface. The bathtub direct attachment type liquid circulation pump device according to claim 5, wherein a spiral groove into which the spiral wall is inserted is formed. The extended flow path portion formed in the flow path forming chamber is configured to have a downward slope toward a portion communicating with the suction port at least from the middle thereof. The bathtub direct-attachment type liquid circulation pump device according to the item.

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