JP6674756B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device, and more particularly, to a pump device for pumping liquid.

  Patent Literature 1 proposes a pump device applied to a non-installed flush toilet device (pressure-feeding toilet device) which is disposed on a bedside in a user's living room and used as a nursing care toilet. In this flush toilet apparatus, the filth is crushed by stirring the water flow in a crushing unit, and the crushed filth is pumped by a pumping unit of a pump device and drained to the outside.

  In this conventional flush toilet apparatus, even if foreign matter (non-crushable foreign matter) other than waste and toilet paper is mistakenly flushed, the foreign matter stays in the water storage tank, and the driving means such as the electric motor locks. The user can continue to use the toilet device because it is not disabled. In a flush toilet device used as a nursing toilet disposed at the bedside in a living room, this countermeasure against foreign substances is a very important issue that affects the establishment of a product business.

In addition, the pump device applied to the bedside care toilet is designed to discharge finely crushed waste to the outside (outdoor drain pipe) through a thin and long drain hose. It is preferable to employ a centrifugal pump that is compact, inexpensive, and can achieve a high head. However, in this centrifugal pump, it is necessary to narrow the flow path in order to generate a high pressure, and therefore, there is a problem that the flow path is clogged when large dirt flows in.
For this reason, in the pump device applied to the toilet device of Patent Document 1, only the fine matter pulverized to a size equal to or smaller than a predetermined value in the pulverizing unit flows into the pressure feeding unit, thereby preventing the flow path clogging of the pressure feeding unit. doing.

Patent No. 5495191

  On the other hand, the inventors of the present invention have studied a pumping unit of a pump device having a narrow flow path and a simple structure in order to form a centrifugal pump that generates a relatively small and high pressure.

  However, as described above, in the flush toilet device to which the pump device is applied, foreign substances other than dirt and toilet paper may be accidentally washed away, but in particular, `` box tissue '', `` washable buttocks '', `` Foreign matter such as “flowable tissue” and “flowable cleaning sheet” is a foreign matter that is only crushed to a fibrous state in the crushing section (a foreign matter that can be crushed only halfway). It has come to be used. The fibrous foreign matter is pulverized to a fibrous state in the pulverizing section and becomes smaller, so that it flows into the pressure feeding section. The fibrous foreign matter flows into the pumping unit, and is easily caught in a narrow flow path of the pumping unit.Furthermore, the hooked fibrous foreign matter is successively entangled with new fibrous foreign matter and grows large, and eventually. There is a new problem of blocking the narrow flow path in the pumping section.

  Further, even in a general pump device, when fibrous foreign matter flows into the pumping section of the pump device, the foreign matter is easily caught in a narrow flow path of the pumping section. And a new fibrous foreign substance is entangled with the fiber and grows large, and eventually a new problem of blocking a narrow flow path in the pumping unit has arisen.

  Therefore, the present invention has been made to solve the above-described problem, and is intended for a case in which fibrous foreign matter flows into a centrifugal pumping section (such as a centrifugal pump) capable of realizing a high head. Another object of the present invention is to provide a pump device capable of preventing a fibrous foreign substance from being entangled and growing by being caught on a branch portion and clogging a circumferential flow path.

In order to achieve the above-described object, the present invention provides a pump device for pumping a liquid, which includes a passage restricting unit that passes a foreign substance having a size equal to or less than a predetermined size in a target liquid, and a liquid that has passed through the passage restricting unit. A pumping section for pumping, wherein when a liquid containing fibrous foreign matter flows in, a pumping section for pumping liquid containing fibrous foreign matter, and for discharging the liquid pumped by the pumping section to the outside. A drain pipe, wherein the pumping unit is disposed inside the pumping unit and rotates in the pumping unit, an inflow port formed in the center of the pumping unit, and an outer peripheral portion of the pumping unit. A radial passage extending from the inlet to the outer periphery on the impeller, and a peripheral passage formed between the outer peripheral wall of the pumping portion and the impeller, and extending circumferentially around the outer periphery of the impeller. A centrifugal pumping section comprising: Of the circumferential flow path, the narrowest start portion provided at a position of 0 ° of the entire circumference, extends substantially linearly in the tangential direction of the circumferential flow path outer wall of the pumping unit, the start portion An outlet formed so as to pass through a position of 360 ° outside the opening, a branch where a flow path is branched between the start part and the outlet, and a flow path that is linear with the outlet. And a straight portion connected to the outlet portion, so that the outer circumferential wall of the pumping portion is located at any of 180 ° to 270 ° from the start of the 0 ° position. The radius from the center of the pumping section to the outer wall of the circumferential flow path gradually increases at a constant increase rate in the direction of rotation of the impeller until the formed change point, and the width of the circumferential flow path gradually increases. Further, the rate of increase of the radius of the outer wall of the circumferential flow path on the downstream side of the change point is changed. Upstream is increased than a certain rate of increase radius of side, widened at the downstream side of the circumferential flow path of the change point, thereby, the circumferential flow path side wall at a predetermined increase rate without providing the changing point of The straight portion is configured to be longer than in the case where the radius is increased .
In the present invention configured as described above, in the pump device, the liquid containing the fibrous foreign matter that passes through the passage restricting section may flow into the pumping section. The fibrous foreign matter and liquid flowing from the inflow port into the pumping section flow from the radial flow path to the outer circumferential flow path by centrifugal force generated by rotation of the impeller. The foreign matter and the liquid in the circumferential channel flow around the circumferential channel and flow out of the outlet. However, at this time, the fibrous foreign matter is caught on the branch portion where the flow path is branched between the start portion and the outlet portion, and new fibrous foreign matter is entangled one after another with the caught fibrous foreign material. Together, they grow large, creating a new problem of clogging the circumferential channel. However, according to the pump device of the present invention , the outer circumferential wall of the pumping unit has a constant increase rate of the radius of the outer circumferential wall on the downstream side of the change point. And increasing the width of the circumferential flow path on the downstream side of the change point, thereby increasing the radius of the circumferential flow path side wall at a predetermined increase rate without providing a change point. Also, the straight portion is configured to be long . Therefore, since the substantially linear flow path leading to the outlet is relatively long, the posture of the fibrous foreign matter when the fibrous foreign matter is directed to the outlet is directed in a direction along the linear flow. To prevent the fibrous foreign matter from being caught on the branch portion, and thereby the new fibrous foreign matter is entangled one after another with the caught fibrous foreign matter and grows greatly, thereby clogging the circumferential flow path. Can be prevented.

In the present invention, preferably, the outer circumferential flow path wall of the pumping unit is located near a change point of the circumferential flow path outer wall, and is located outside the circumferential flow path from the center of the pumping unit in a region downstream of the change point. The rate of increase of the radius up to the wall is formed in a range that is 1.2 times or more and 20 times or less the rate of increase of the radius from the center of the pumping unit to the outer wall of the circumferential flow path in the region upstream of the change point. I have.
In the present invention configured as described above, the outer circumferential wall of the pumping section is formed so that the outer circumferential wall on the downstream side of the change point is elongated so as to lengthen a substantially linear flow path provided on the downstream side of the change point. It is formed so as to increase the rate of increase of the radius of the flow path outer wall in a predetermined range from a constant rate of increase of the radius on the upstream side of the change point, and to increase the width of the circumferential flow path on the downstream side of the change point. ing. Therefore, since the substantially straight flow path connected to the outlet portion more reliably becomes longer, the posture of the fibrous foreign matter when the fibrous foreign matter is directed to the outlet portion is changed in a direction along the linear flow. The fibrous foreign matter can be more reliably prevented from being caught on the branch portion.

In the present invention, preferably, the outer circumferential wall of the pumping section has a substantially constant rate of increase in radius in a region from the changing point to the straight section.
In the present invention configured as described above, in the region from the change point to the straight portion, it is possible to suppress the waste and the washing water from being disturbed. Therefore, it is possible to prevent the waste and the washing water flowing out of the outlet from being disturbed.

  ADVANTAGE OF THE INVENTION According to the pump apparatus of this invention, even if a fibrous foreign substance flows into the centrifugal pumping part (centrifugal pump etc.) which can implement | achieve a high head, a fibrous foreign substance is caught on a branch part. As a result, they can be prevented from growing entangled and clogging the circumferential flow path.

1 is an overall perspective view showing a flush toilet device to which a pump device according to an embodiment of the present invention is applied. 1 is an overall configuration diagram illustrating a flush toilet device to which a pump device according to an embodiment of the present invention is applied. 1 is a sectional view showing a crushing and pumping device of a flush toilet device to which a pump device according to an embodiment of the present invention is applied. FIG. 4 is an enlarged cross-sectional view illustrating a pumping section of the pulverizing pumping device of FIG. FIG. 5 is an external view of the pumping chamber of the pumping unit of the pulverizing pumping device of FIG. 4 when viewed from obliquely below with a lower cover removed. It is a figure which shows roughly the flow of the dirt and wash water in the pump room of the pumping part of the crushing pumping apparatus of FIG. It is a figure which shows roughly the flow of the filth and the wash water in the pump room of the pumping part of the pulverizing pumping device of the flush toilet apparatus to which the pump device of a comparative example is applied. The change in the width of the circumferential flow path with respect to the angle is different between the one of the pumping unit in the flush toilet device to which the pump device of the present embodiment is applied and the one of the pumping unit in the flush toilet device to which the pump device of the comparative example is applied. It is a figure which shows the result of having compared with the thing.

  Next, a flush toilet device to which a pump device according to an embodiment of the present invention is applied will be described with reference to the accompanying drawings. First, an overall structure of a flush toilet device to which a pump device according to an embodiment of the present invention is applied will be described with reference to FIGS. FIG. 1 is an overall perspective view showing a flush toilet device to which a pump device according to an embodiment of the present invention is applied, and FIG. 2 is an overall configuration showing a flush toilet device to which a pump device according to an embodiment of the present invention is applied. FIG.

  As shown in FIG. 1, a flush toilet device 1 to which the pump device according to the present embodiment is applied is a non-installed flush toilet device that can be used as a nursing toilet disposed at a bedside. The flush toilet device 1 includes a toilet body 2, a crushing / pumping device 4 that crushes and discharges dirt and washing water discharged from the toilet body 2, and a flexible device for supplying the washing water to the toilet body 2. An indoor water supply pipe 6 and an indoor drainage pipe 8 (drainage pipe of a pump device) for discharging dirt and washing water from the crushing and pumping device 4 are provided.

  In addition, since the flush toilet device 1 is a non-installation type and is movable, a plurality of legs 12 are attached to the lower surface of the toilet body 2, and the legs 12 support the toilet body 2 on the floor 10. It has become. Further, a flip-up type armrest 14 is attached to the toilet body 2 to support a user standing and sitting, and to further ensure a balance in a sitting state.

  As shown in FIG. 2, the flush toilet apparatus 1 is disposed on a floor 10 of an indoor 16 a of a building 16. Further, the indoor water supply pipe 6 is connected to an outdoor water supply pipe 18 arranged at the outdoor 16b, and the indoor drainage pipe 8 is connected to an outdoor drainage pipe 20 arranged at the outdoor 16b. In this manner, the flush toilet device 1 to which the pump device according to the present embodiment is applied can discharge the waste discharged into the toilet body 2 to the outside.

  As shown in FIG. 2, the toilet body 2 of the flush toilet device 1 includes a bowl portion 22 provided on the front side of the toilet body 2 for receiving dirt, and a bowl portion 22 provided on an upper rear portion of the bowl portion 22 for cleaning. The apparatus includes a water supply device 24 (water supply means) for supplying water, and a drain trap line 26 provided to communicate with the bottom of the bowl portion 22 for discharging dirt together with the wash water. The water supply device 24 includes a water supply valve 28 connected to the downstream end of the indoor water supply pipe 6, and a water supply passage 30 for supplying wash water from the water supply valve 28 to the bowl 22. At the downstream end of the drain trap line 26, a discharge port 32 for discharging dirt and washing water to the crushing and feeding device 4 is formed.

Here, the toilet body 2 of the flush toilet device 1 to which the above-described pump device of the present embodiment is applied is a flush toilet that discharges dirt due to a drop of flush water in the bowl portion 22. However, the toilet main body 2 is not limited to this type, and is applicable to a siphon type or siphon jet type toilet, a flap valve type toilet provided with a flap valve at the outlet 32 of the toilet main body 2, or the like. .
In addition, the water supply device 24 may be of a tank type that supplies cleaning water from a water storage tank.

  As shown in FIG. 2, the crushing / pumping device 4 of the flush toilet device 1 includes a crushing unit 34 for crushing the filth, and a crushing unit 36 for pumping the crushed filth to the indoor drain pipe 8. The crushing unit 34 and the pressure feeding unit 36 are provided with an electric motor 38 that is also used to drive them. Here, the electric motor 38 is a DC brushless motor, and can perform variable speed control.

  The flush toilet device 1 has an operation unit 40 operated by the user, a notification unit 42 for notifying the user of status information of the flush toilet device 1, and a user operating the operation unit 40. A control unit 44 for controlling the water supply device 24 and the crushing and feeding device 4 and for notifying the status information of the flush toilet device 1 to the notification unit 42 is provided.

  The operation unit 40 is provided with operation switches and the like, and the user can operate the start of the cleaning operation by the operation switches and the like. When an operation switch or the like of the operation unit 40 is operated, an operation command is transmitted to the control unit 44, and the control unit 44 sends a water supply command to the water supply device 24 based on the command, and the water supply device 24 Water is supplied to the section 22 for a predetermined time, and the toilet body 2 is washed. Further, the control unit 44 sends an operation signal to the pulverizing / pumping device 4 to operate the pulverizing / pumping device 4. Further, the control unit 44 sends the state information of the flush toilet device 1 to the notification unit 42. The notification unit 42 includes an LED lamp and / or a small speaker, and can notify the user of the status information visually and / or by voice. Further, the notification unit 42 can turn on or blink the LED lamp in response to a command from the control unit 44 to notify the user of the abnormality.

  Next, with reference to FIGS. 3 to 7, the crushing and feeding device 4 of the flush toilet device 1 will be described. FIG. 3 is a sectional view showing a crushing and pumping device of a flush toilet device to which the pump device according to the embodiment of the present invention is applied, FIG. 4 is an enlarged sectional view showing a pumping section of the crushing and pumping device, and FIG. FIG. 6 is an external view of the pumping chamber of the pumping unit of the pulverizing / pumping device as viewed obliquely from below with the lower cover removed, and FIG. FIG. 7 is a diagram schematically showing flows of dirt and washing water in a pump chamber of a pumping unit in a crushing and pumping device of a flush toilet device to which a pump device of a comparative example is applied. .

As shown in FIG. 3, the pulverizing / pumping device 4 is connected to the outlet 32 of the drain trap line 26 of the above-mentioned toilet body 2 so that dirt flows in with the washing water.
The pulverizing / feeding device 4 includes a storage tank 46, and the pulverizing unit 34 is provided inside the storage tank 46. The pulverizing section 34 has a pulverizing chamber 48, and the pulverizing chamber 48 is formed inside the peripheral wall 48a. The peripheral wall 48a of the crushing chamber 48 communicates on one side with the outlet 32 of the drain trap pipe 26 described above. At the lower part of the crushing chamber 48, a disk 50 for stirring the filth in the crushing chamber 48 is provided. The disk 50 is directly connected to a rotation shaft 52 (common rotation drive shaft) attached to the electric motor 38 and is rotatable. Further, a large number of projections 50a are formed on the upper surface of the disk 50, so that dirt is easily caught on these projections 50a and is easily stirred.

  Specifically, the arrow in FIG. 3 indicates the flow state of the waste and the washing water. As is clear from this arrow, the waste that has fallen on the disk 50 is rotated together with the cleaning water by the rotation of the disk 50. It moves to the outer peripheral side, collides with the peripheral wall 48a, then rises along the peripheral wall 48a, and further descends on the disk 50 while moving to the inner peripheral side. The filth is thus stirred and crushed while turning vertically. As described above, the pulverizing unit 34 constitutes a water-stream decomposition type pulverizing unit that stores cleaning water and decomposes filth by a water flow generated by stirring the stored cleaning water. Note that the crushing unit 34 may be a crushing unit that physically crushes filth with a blade such as a cutter.

  As shown in FIG. 3, in the vicinity of the outer peripheral side of the disk 50 of the peripheral wall 48a, a large number of passage openings 48b of a predetermined size (passage regulating portions of the pump device) are formed. By these passage openings 48b, only dirt crushed to a predetermined size or less can pass through the peripheral wall 48a, while the passage of dirt larger than the predetermined size is restricted.

  The pump device that pumps the liquid includes a passage opening 48b (a passage restricting portion) through which a foreign substance having a size equal to or less than a predetermined value in the target liquid passes, and a pumping portion 36 that pumps the liquid that has passed through the passage restricting portion. When the liquid containing the fibrous foreign matter F flows in, and an indoor unit for discharging the liquid pumped by the pumping unit 36 to the outside from the pumping unit 36. And a drain pipe 8.

Next, referring to FIGS. 4 and 5, the pumping section 36 (pumping section of the pump device) of the pulverizing pumping device 4 will be described in detail.
The pumping section 36 forms a centrifugal pump capable of realizing a high head. The pumping section 36 includes a pump chamber 56, and a lower cover 57 is attached to a lower portion of the pump chamber 56, and an inflow port 58 into which dirt and washing water flows is formed in the center of the lower cover 57. I have. An outlet 60 from which dirt and washing water flows out is formed on the outer peripheral side of the pump chamber 56.
The pumping unit 36 further includes an impeller 62 that is arranged inside the outer circumferential wall 64 of the pump chamber 56 and rotates in the pump chamber 56. The impeller 62 includes a disk-shaped disk portion 66 and a projection 68 provided so as to partially protrude downward from the disk portion.

  The disk 66 is coupled to the lower end of the rotating shaft 52 and is rotated by the electric motor 38. The rotating shaft 52 extends at least between the crushing unit 34 and the pumping unit 36, and has a driving force of a disk 50 that stirs washing water in the crushing unit 34 from the electric motor 38 (drive source) and the impeller 62 of the pumping unit 36. It is formed as a common rotary drive shaft for transmitting a drive force for rotating the disk portion 66.

The two protrusions 68 of the impeller 62, that is, the two blade portions, have the same shape, are arranged point-symmetrically in a plan view, are formed between the protrusions 68, and have the impeller Two radial flow paths 74 extending from the central portion toward the outer periphery are formed on 62. The radial flow path 74 communicates with an inflow port 58 formed at a lower portion and communicates with a later-described circumferential flow path 76 formed outside the outer periphery of the impeller 62.
Further, between the outer peripheral side wall surface 68 b of each of the two protrusions 68 of the impeller 62 and the outer peripheral wall 64 of the pump chamber 56, a circumferential flow path 76 extending circumferentially around the outer periphery of the impeller 62 is formed. Is done. In the region where the radial flow path 74 is formed in the impeller 62, a circumferential flow path 76 is formed between the outlet of the radial flow path 74 and the circumferential flow path outer wall 64. The circumferential channel 76 communicates with the radial channel 74, and an outlet 76 b at the downstream end communicates with the outlet 60 of the pump chamber 56.

  In the radial flow path 74, the dirt and the washing water are relatively strongly pushed out from the central portion toward the radially outer side by the centrifugal force generated by the rotation of the impeller 62, and are relatively strong toward the radially outward side. A flow will be formed. Here, in the present embodiment, the two radial flow paths 74 formed by the two projections 68 of the pumping unit 36 form a single flow path that extends substantially linearly as a whole. As a modified example, the radial flow path 74 of the impeller 62 may be a different shape or number of radial flow paths formed by different shapes or numbers of protrusions, for example, formed by three protrusions. There may be three radial channels, or four radial channels formed by four projections, or multiple radial channels formed by multiple projections It may be.

  In the present embodiment, the impeller 62 that rotates in the pump chamber 56 of the pumping unit 36 includes a disk 66 provided above the pump chamber 56 and attached to the rotating shaft 52 extending upward, And a projection 68 provided to protrude downward from the flush toilet device to which the pump device according to another embodiment is applied. A configuration may be provided that includes a disk portion provided below and attached to a rotating shaft extending downward, and a projection provided to protrude upward from the disk portion.

Next, the circumferential flow path 76 of the pumping section 36 of the crushing / pumping device 4 will be described in detail with reference to FIGS.
The circumferential flow path 76 forms a flow path annularly along the outer periphery of the impeller 62. In order to facilitate the description of the angular position of each region of the annular flow path 76 formed in an annular shape using the expression of an angle, the position of the starting portion 76a described below is set to an angle of 0 °, and the impeller 62 is The angle gradually increases toward the downstream side along the rotation direction D1, and the angle of the position of the outlet 76b outside the start portion 76a after making a round in the circumferential flow path 76 will be described.

  The circumferential flow path 76 is substantially straight along the tangential direction D2 of the narrowest starting portion 76a provided at an angular position of 0 ° in the entire circumference and the circumferential flow path outer wall 64 of the pump chamber 56. An outlet 76b that extends and passes through a 360 ° angular position outside the starting portion 76a, and is connected to the outlet 76b to form a linear flow path with the outlet 76b. Between the inner start portion 76a and the outer outlet portion 76b at an angle position of 0 ° and an angle position of 360 ° of the entire circumference of the circumferential flow path 76. And a branch portion 76d for branching.

The start part 76a forms the narrowest part in the circumferential flow path 76, that is, the part having the smallest flow path cross-sectional area. The width W1 of the flow path in the circumferential flow path 76 is determined by the distance between the circumferential flow path outer wall 64 of the pump chamber 56 and the outer peripheral wall surface 68b of the impeller 62.
The circumferential outer wall 64 of the pump chamber 56 extends circumferentially from the center C of the pumping section 36 in the rotation direction D1 of the impeller 62 from the start portion 76a at the 0 ° position to the change point 76e at the predetermined angle. The radius R1 up to the direction flow path outer wall 64 gradually increases at a constant increase rate. Accordingly, the radius R1 of the outer wall 64 of the circumferential direction increases from the start portion 76a at the position of 0 ° to the changing point 76e of the predetermined angle, and the radius r1 of the impeller is constant. The width W1 of 76 is formed so as to gradually increase from the minimum width at the start portion 76a toward the downstream side. In this manner, the outer circumferential wall 64 of the pump chamber 56 has a radius R1 gradually increasing at a constant rate along the involute curve from the starting portion 76a at the 0 ° position to the changing point 76e at the predetermined angle. It is formed to increase.

  The outlet portion 76b extends linearly outward from a region of the circumferential flow path outer wall 64 near the angular position of about 315 ° of the circumferential flow path 76 along the tangential direction D2 of the circumferential flow path outer wall 64. A channel is formed. The outlet 76b forms a flow path that extends linearly outside the branch 76d, and allows the flow of dirt and washing water branched outward by the branch 76d to flow out.

  The branch part 76d is configured to branch the dirt and the washing water that have swirled in the circumferential flow path 76 into the start part 76a side and the outlet part 76b. In the branch part 76d, the dirt and the washing water are mainly fed by pressure from the outlet part 76b, but a part flows into the start part 76a and further circulates in the circumferential flow path 76.

In addition to the outlet 76b that forms a linear flow path, a straight part 76c is formed to further extend the linear flow path. The straight portion 76c forms a flow path that extends substantially straight along the tangential direction D2 of the circumferential flow path outer wall 64. More specifically, in the region immediately before entering the outlet 76b, for example, in the region near the angular position of about 300 ° to 315 ° of the circumferential channel 76, the straight portion 76c It is formed linearly, and a linear flow path is formed. As will be described later, the straight portion 76c has a radius R2 of the circumferential flow path outer wall 64 downstream of a change point 76e of the circumferential flow path outer wall 64, so that the corner 76f of the circumferential flow path 76 has The outer peripheral wall 64 in the downstream region (the corner of the peripheral passage 76 at a position facing the outlet 76b) has a relatively small angular position, for example, an angle of about 300 °. The position is substantially linear with the outlet outside wall 76g from the position, and is formed so as to form the straight portion 76c.
Note that the outer circumferential wall 64 of the straight portion 76c in the downstream region of the corner portion 76f may be formed along a relatively large arc and may be slightly curved. That is, the straight portion 76c includes a case where the outer circumferential flow path wall 64 is gradually bent and the inner circumferential flow path 76 forms a substantially linear flow path.

The change point 76e of the predetermined angle on the circumferential flow path outer wall 64 of the pump chamber 56 is an angular position in a range of 180 ° to 270 °, more preferably a position in a range of 200 ° to 260 °, still more preferably It is formed at an angular position in the range of 220 ° to 250 °. As shown in FIG. 6, the change point 76e of the predetermined angle is defined by the rate of increase (change rate) of the radius R2 of the circumferential flow path outer wall 64 on the downstream side of the change point 76e and its upstream side. Is changed so as to increase from the rate of increase of the radius R1 of the outer circumferential wall 64 of FIG.
The outer circumferential wall 64 of the pump chamber 56 has a radius R2 from the center C of the pumping unit 36 in the area downstream of the changing point 76e to the circumferential outer wall 64 near the changing point 76e. An increase rate is formed in a range of 1.2 times or more and 20 times or less, and more preferably 5 times or more, with respect to a similar increase rate of the radius R1 in a region upstream of the change point 76e. It is formed in a size of 10 times or less.
The shape of the corner portion 76f of the circumferential flow path 76 of the circumferential flow path outer wall 64 of the pump chamber 56 differs depending on the angular position of the change point 76e, the increase rate of the radius R2, and the like. Therefore, the angular position at which the entrance of the straight portion 76c is formed may be, for example, an angular position in a range of 270 ° to 315 °, for example, an angular position such as about 300 °, about 280 °, or about 270 °. .

A substantially constant increase rate of the radius of the circumferential flow path outer wall 64 on the upstream side of the change point 76e of the predetermined angle is further increased on the downstream side of the change point 76e from the above-described substantially constant increase rate. Since the increase rate is used, the increase rate of the radius R2 of the circumferential flow path outer wall 64 on the downstream side of the change point 76e of the predetermined angle is increased, and the width W2 of the circumferential flow path on the downstream side of the change point 76e of the predetermined angle is increased. Is increasing. Here, the outer circumferential wall 64 of the pump chamber 56 has a substantially constant radius of increase in the radius from the changing point 76e to the straight portion 76c through the corner portion 76f.
In a region on the downstream side of the change point 76e, the radius R2 of the outer wall 64 in the circumferential direction is increased, and the flow path is formed so as to expand outward. Since the circumferential channel outer wall 64 is formed so as to bulge outward, the size of the curved portion at the top of the corner portion 76f is formed relatively small, and the outer circumferential flow channel in the downstream region of the corner portion 76f is formed. The wall 64 is formed substantially linear. Therefore, a straight portion 76c is formed from the downstream region of the corner portion 76f. Immediately before the outlet 76b, the straight portion 76c is formed in a straight line with the outlet 76b, so that the distance L1 from the inlet 76h of the straight portion 76c to the branch 76d is defined by the straight portion 76c. The distance of the straight flow path is longer by the length of the straight part 76c than the distance L2 from the inlet 76i of the outlet part 76b to the branch part 76d when there is no outlet.

In the present embodiment, the outer circumferential flow path wall 64 is formed substantially linearly over a distance L1 from the inlet 76h of the straight part 76c to the branch part 76d. On the other hand, in the comparative example, the circumferential channel outer wall 164 is formed substantially linearly over a distance L2 from the inlet 176i of the outlet 176b to the branch 76d.
The length of the central axis passing through the outlet 76b in the present embodiment from the vicinity of the branch portion 76d to the position where the central axis intersects the corner 76f is determined by the central axis passing through the outlet 176b in the comparative example. The length from the vicinity of 176d to the position intersecting with the corner portion 176f is longer.

  In the present embodiment, the radius R2 of the outer circumferential flow path outer wall 64 on the downstream side of the change point 76e is formed at a substantially constant increase rate. The road side wall 64 may be formed such that the rate of increase of the radius R2 changes. In particular, in FIG. 6, the outer side wall 64 in the circumferential direction on the downstream side of the change point 76 e may be formed as a radius R <b> 3 so that the top of the corner portion 76 f ′ projects outward. As described above, the top of the corner portion 76f 'is formed by an arc having a relatively small radius of curvature, and the downstream portion of the corner portion 76f' is formed as a relatively long straight portion, so that the inside of the corner portion 76f 'is formed. The straight portion 76c 'in the circumferential flow path 76 can be formed very long. Therefore, it is easy to adjust the direction of the fibrous foreign matter F along a linear flow.

Next, the development of the present invention by the present inventors will be described with reference to FIGS.
In FIG. 6, a changing point is provided on the outer circumferential wall of the pumping chamber of the pumping unit of the pumping device of FIG. 5, and a straight portion provided on the downstream side of the area of the changing point at a predetermined angle is elongated. The rate of increase in the radius of the outer wall of the circumferential flow path in the vicinity of the area of the change point is further increased from the above-described constant increase rate, and the width of the circumferential flow path on the downstream side of the area of the change point is formed to be wider. FIG. 7 schematically shows a state in which a fibrous foreign material flows in a circumferential flow path in the pumping chamber. In FIG. 7, as a comparative example, a circumferential flow path outer wall of the pumping chamber of the pumping unit of the pump device is shown. FIG. 3 schematically shows a state in which a fibrous foreign substance is formed along an involute curve and flows in a circumferential flow path in the pressure feeding chamber.

The inventors of the present invention have been studying to discharge dirt and cleaning water in the pump chamber with as high a pumping performance as possible in order to discharge dirt in the pump chamber of the pumping section.
First, as shown in FIG. 7, the design concept of the flush toilet device to which the pump device of the comparative example is applied is to place importance on the pumping performance of the pumping chamber (pump chamber) of the pumping section and to set the circumferential flow of the pump chamber. The shape of the road side wall was formed along the involute curve. In a centrifugal pump, it is important to convert the flow velocity energy of the washing water flowing in the circumferential flow path into pressure energy with as high efficiency as possible, and the cross-sectional area of the circumferential flow path gradually follows the involute curve. By increasing at a constant rate, the flow velocity of the stream is reduced and the pressure is increased. Therefore, it has been considered that gradually changing the shape of the outer circumferential wall of the pump chamber in the circumferential direction along the involute curve to achieve high pumping performance contributes to the discharge of dirt and foreign matter. In this way, by gradually changing the shape of the outer wall of the circumferential flow path along the involute curve and eliminating sudden changes, the disturbance of the flow in the circumferential flow path is eliminated, and the pumping performance is as high as possible. It has been considered important to discharge indoor dirt and washing water.

  However, when foreign substances such as "box tissue" and "flowable buttocks" are washed away, these foreign substances are pulverized only to the state of the fibrous foreign substances F in the pulverizing section, and thus flow into the pressure feeding section 136. It became a thing. The fibrous foreign matter F that has flowed into the pumping section 136 flows from the radial flow path to the circumferential flow path 176 due to the centrifugal force generated by the rotation of the impeller 62, and as shown in FIG. The air flows around the path 176 and flows out from the outlet 176b. At this time, due to the centrifugal force, the water flows from the radial flow path toward the circumferential flow path 176, and a relatively strong water flow that is directed outward is generated. At this time, as shown by an arrow A1 in FIG. 7, the flow of the water flow flows while having a vector going outward due to the force of the centrifugal force. The fibrous foreign matter F has a slight length due to the fibrous shape, and receives the force of the centrifugal force to flow in the circumferential flow path 176 in a lateral posture in the direction shown by the arrow A1. . The lateral orientation refers to, for example, an orientation in which the front end of the fibrous foreign matter F is located slightly outside and the rear end is located slightly inside, and for example, the fibrous foreign matter F A posture in which all or a part of F is oriented laterally or obliquely to streamlines in the circumferential flow path 76.

  As shown by the arrow A1, when the fibrous foreign matter F flowing in the state of the horizontal position reaches the branch portion 176d, the fibrous foreign material F has the horizontal position. It is easy to be caught on the portion 176d, and once the fibrous foreign matter F is caught on the branch portion 176d, the new fibrous foreign matter F that has been caught is successively entangled with a new fibrous foreign matter F, and grows greatly. There is a problem that a narrow flow path in the pumping section is closed.

To solve this problem, as shown in FIG. 6, the present inventors have developed a new method so that the size of the pumping section is not easily increased and the fibrous foreign matter F is less likely to be caught on the branch portion 76d. A straight portion 76c is formed in the second portion, and a straight flow path to the branch portion 76d is formed longer, so that the posture of the fibrous foreign matter F is adjusted in a direction along the straight streamline.
Specifically, as shown in FIG. 6, a circumferential portion is formed so that a straight portion 76c connected to the outlet portion 76b is formed relatively long so as to form a straight flow path with the outlet portion 76b. A change point 76e is provided on the flow path outer wall 64, and the radius R2 of the circumferential flow path outer wall 64 is increased downstream of the change point 76e, and the width of the circumferential flow path 76 is increased.

  As a result, in the circumferential flow path 76, under the force of the centrifugal force as shown by the arrow A2, the fibrous foreign matter F flowing while having a vector directed outward and flowing in the lateral posture is shown. However, in the straight portion 76c and the outlet portion 76b, the posture changes to a vertical orientation along a flow line of the flow in a linear flow as indicated by an arrow A3. In the linear flow as shown by the arrow A3, the flow of the water flow mainly has a vector that goes straight toward the outlet 76b. As described above, the fibrous foreign matter F is arranged in the vertical position along the streamline of the flow as shown by the arrow A3. 76d so that the fibrous foreign matter F is entangled with the branch portion 76d and / or the start portion 76a and grows large, thereby reliably preventing the narrow flow path in the pumping portion from being blocked. became.

  At the change point 76e, the rate of increase of the radius of the circumferential flow path outer wall 64 upstream of the change point 76e and the rate of increase of the radius of the circumferential flow path outer wall 64 downstream of the change point 76e are different. May be slightly changed at the change point 76e, and the flush toilet device to which the pump device according to the present invention is applied is the same as the conventional flush device. Although the pumping performance (pumping performance) is lower than that of the toilet device, the present inventors have found that the fibrous foreign matter F is entangled with the branch portion 76d and / or the starting portion 76a and grows greatly, and the This makes it possible to more reliably prevent the narrow flow path in 36 from being blocked.

In FIG. 8, the change in the width of the circumferential flow path 76 with respect to the angle is different between the case of the pumping section of the flush toilet device to which the pump device of the present embodiment is applied and the flushing device to which the pump device of the comparative example is applied. It shows the results of measurement and comparison with those of the pumping section in the toilet device. The vertical axis indicates the size [mm] of the width of the radial channel 76 in the radial direction, and the horizontal axis indicates the angle [°].
In the present embodiment, the width W1 of the circumferential flow path 76 is changed from the minimum width at the start portion 76a at the 0 ° angular position to the angular position at a predetermined angle (about 240 ° in the present embodiment). It is formed so as to gradually increase at a substantially constant increase rate (change rate) up to a point 76e. The change point 76e of the predetermined angle is defined by the increase rate (change rate) of the radius R2 of the outer circumferential flow path outer wall 64 on the downstream side of the change point 76e and the upstream circumferential flow path outer wall 64 on the upstream side. Is changed so as to increase from the rate of increase of the radius R1 of. The increase rate of the radius R2 of the outer wall 64 in the circumferential direction is also substantially constant. With the change point 76e as a boundary, the increase rate (change rate) of the width W2 of the downstream circumferential flow path 76 is further increased from the increase rate of the width W1 of the upstream circumferential flow path 76. You can see that. In the present embodiment, the change point 76e is provided at an angular position of about 240 °, and the start position of the straight portion 76c is located at an angular position of about 300 °.
On the other hand, in the pumping section of the flush toilet device to which the pump device of the comparative example is applied, the circumferential flow path outer wall 164 is formed in a shape along the involute curve, and the starting portion 176a is connected to the outlet portion 176b. The width W3 of the circumferential flow path 176 is formed so as to gradually increase at a substantially constant increase rate. In the comparative example, the change point 76e is not provided, and the inlet position of the outlet 176b that forms a linear flow path is located at an angular position of about 315 °.

  Next, an operation (action) of the flush toilet device to which the above-described pump device according to the embodiment of the present invention is applied will be described with reference to FIGS. 2, 3 and 6, each arrow indicates the flow state of the waste and the washing water.

  First, when a user operates an operation switch or the like of the operation unit 40 to wash the toilet body 2 with washing water, a washing operation is started. When an operation switch or the like of the operation unit 40 is operated, the operation command is transmitted to the control unit 44, and the control unit 44 sends a water supply command to the water supply device 24 based on the command, and the water supply device 24 Is supplied for a predetermined time, and the toilet body 2 is washed. Further, an operation command is sent from the control unit 44 to the electric motor 38, and the rotation operation of the electric motor 38 is started.

  The dirt and washing water are discharged from the drain trap line 26 due to the head of the washing water, flow into the grinding chamber 48 of the grinding and feeding device 4 through the outlet 32, and descend on the disk 50. In the crushing chamber 48, the disc 50 has already been rotated, and the dirt that has descended onto the disc 50 moves to the outer peripheral side by the rotation of the disc 50 together with the washing water, collides with the peripheral wall 48a, and then collides with the peripheral wall 48a. It rises along the path, and then descends while moving to the inner peripheral side. In this way, it is stirred and crushed while turning vertically (see FIG. 3).

  Next, as shown in FIGS. 3 and 4, a large number of passage openings 48 b having a predetermined size are formed near the outer peripheral side of the disk 50 of the peripheral wall 48 a, so that the waste material pulverized in the pulverization chamber 48 is formed. Among them, the one smaller than the size of the passage opening 48b is discharged from the passage opening 48b to the downstream channel 54. In addition, the filth larger than the size of the passage opening 48b is continuously stirred and crushed in the crushing chamber 48 until the sewage becomes smaller than a predetermined size.

  The pulverized dirt flows into the pump chamber 56 together with the washing water from the flow path 54 through an inlet 58 formed at the center of the lower surface of the pump chamber 56 of the pumping unit 36. The dirt and washing water flowing into the pump chamber 56 flow into a radial flow path 74 formed between the projections 68, and from the center of the pump chamber 56, due to centrifugal force generated by rotation of the impeller 62, It flows from the radial channel 74 toward the circumferential channel 76. Further, the dirt and the washing water pushed out from the radial flow path 74 to the outer peripheral side of the circumferential flow path 76 by the centrifugal force flow into the circumferential flow path 76 while maintaining the momentum and the direction of the flow. Accordingly, as shown by the arrow A2, the size and direction of the dirt and the wash water flowing into the circumferential flow path 76 are such that they are directed outward from the center axis of the circumferential flow path 76 due to the centrifugal force of the impeller 62. Form a flow with a vector having

  Under the centrifugal force, the waste and the washing water flow in the circumferential flow path 76 from the start portion 76a toward the outlet 76b. At this time, the circumferential flow path 76 is formed so that the flow path cross-sectional area gradually increases from the start portion 76a, the flow velocity energy of the cleaning water is gradually converted to pressure energy, and the cleaning water is 76b.

  A more detailed flow will be described. The flow of the dirt and the washing water is the flow toward the downstream side (circumferential direction) along the circumferential flow path outer wall 64 from the start portion 76a at the 0 ° position to the area near the change point 76e at the predetermined angle. , Together with the outward flow due to the centrifugal force, forms a flow having an outward vector as shown by arrow A2. At this time, the fibrous foreign matter F has a slight length because it is lint-like and fibrous, and receives a force of centrifugal force and has a horizontal orientation similar to the direction of the water flow as shown by arrow A2. It will flow in the circumferential channel 76 while having the posture. For example, in the case where the fibrous foreign matter F flows in the direction of the water flow as shown by the arrow A2, the front end of the fibrous foreign matter F is located near the outer circumferential wall 64 (near the outer circumference of the circumferential flow passage 76). ), And the fibrous foreign matter F flows in a lateral position such that the rear end thereof is located near the outer peripheral side wall surface 68b of the impeller 62 (near the inside of the circumferential flow path 76). Since the fibrous foreign matter F receives the force of the centrifugal force, it is easy to take a lateral posture.

When the fibrous foreign matter F flows into the straight portion 76c in the downstream region of the corner portion 76f, it flows along the straight flow path of the straight portion 76c and the outlet 76b. Since the substantially straight flow path is formed over a relatively long distance by the flow path to which the straight part 76c is further added so as to extend the outlet part 76b, the fibrous foreign matter F is formed in the straight part 76c and the outlet part. When flowing through the straight flow path 76b, the posture is changed from the horizontal posture to the vertical posture along the flow line of the linear flow passage (the posture parallel to the flow streamline as indicated by arrow A3). Is arranged. Since the linear flow path can be formed relatively long by the addition of the straight portion 76c, it is easy to correct the direction of the fibrous foreign matter F along the linear flow.
Further, in the straight flow path of the straight portion 76c and the outlet 76b, since the circumferential flow path outer wall 64 forms a substantially linear continuous wall surface, the flow of dirt and washing water is It is easy to form a flow that is linearly arranged along the outer circumferential wall 64 and is less likely to be disturbed. Therefore, it is easy to adjust the direction of the fibrous foreign matter F included in the flow along the linear flow.

  When the fibrous foreign matter F reaches the vicinity of the branch portion 76d, most of the dirt and cleaning water is linearly discharged from the outlet portion 76b of the flow path outside the branch portion 76d and is pumped from the pumping portion 36. . Further, a part of the dirt and the washing water flows into the flow path inside the branch portion 76d, and flows into the start portion 76a. At this time, since the direction of the fibrous foreign matter F contained in the flow of the dirt and the washing water is set to the vertical position as shown by the arrow A3, the flow of the dirt and the washing water is generated at the branch portion 76d. At the time of branching, the fibrous foreign matter F is suppressed or prevented from being caught in the branching portion 76d in a horizontal position. Therefore, it is possible to prevent the new fibrous foreign matter F entangled with the caught fibrous foreign matter F one after another, grow large, and block the circumferential flow path 76.

  Thereafter, the dirt and cleaning water in the pump chamber 56 are discharged from the outlet 60. The dirt and washing water discharged by the pumping unit 36 pass through the indoor drain pipe 8 and are discharged to the outdoor drain pipe 20, and the operation of discharging the dirt is completed.

Next, a case where the above-described pump device according to the present embodiment is applied to the flush toilet device 1 will be described.
When the pump device according to the present embodiment is applied to the flush toilet device 1, the following non-installed flush toilet device can be provided.
A non-installed flush toilet device, comprising a toilet body, a water supply means for supplying cleaning water to the toilet body, and a crushing unit for crushing dirt discharged together with the cleaning water from the toilet body, wherein A water flow decomposition type pulverizing unit that decomposes dirt by a water flow generated by stirring the stored washing water while storing water, and a pressure feeding unit that pumps the dirt and cleaning water pulverized by the pulverizing unit, A flexible drainage pipe for discharging dirt and washing water pumped by the pumping unit to the outside, and provided between the crushing unit and the pumping unit, crushed to a predetermined size or less by the crushing unit. And a passage restricting portion for passing the waste material to the pumping section, and the pumping section is disposed inside the pumping section and formed in an impeller rotating in the pumping section, and formed at a central portion of the pumping section. The inlet and the protrusion And a radial flow path that communicates with the inflow port and extends toward the outer periphery, and is formed between the outer circumferential wall of the pumping unit and the impeller, and the outer circumference of the impeller extends in the circumferential direction. A centrifugal pumping section having an extending circumferential flow path, wherein the circumferential flow path has a narrowest start portion provided at a position of 0 ° in the entire circumference thereof, and An outlet portion extending substantially linearly along a tangential direction of a circumferential flow path outer wall, and formed so as to pass through a position 360 ° outside the start portion; the start portion; A branch portion in which a flow path is branched between the first and second portions, and a straight portion connected to the outlet portion so as to form a straight flow channel with the outlet portion, The outer wall of the circumferential channel is located at a predetermined angle from the start portion at the 0 ° position. To the point of rotation, in the direction of rotation of the impeller, the radius from the center of the pumping section to the outer wall of the circumferential flow path gradually increases at a constant increase rate, and the width of the circumferential flow path gradually increases. The change point of the predetermined angle is formed at any position of 180 ° to 270 °, and the straight portion provided downstream of the change point is made longer. Increasing the rate of increase of the radius of the outer circumferential wall on the downstream side of the change point from the constant rate of increase of the radius on the upstream side of the change point; A flush toilet device formed to widen the width of the directional flow path.

Next, the operation and effect of the flush toilet device 1 to which the above-described pump device according to the present embodiment is applied will be described.
In the present invention configured as described above, when a foreign substance such as “box tissue” or “flowable ass wipe” flows into the toilet body 2, the foreign matter is pulverized by the pulverizing unit 34 into a fibrous form and flows into the pressure feeding unit 36. I do. The fibrous foreign matter F and the washing water flowing into the pumping section 36 from the inflow port 58 flow from the radial flow path 74 to the outer circumferential flow path 76 by centrifugal force generated by rotation of the impeller 62. The foreign matter and the cleaning water in the circumferential flow path 76 go around the circumferential flow path 76 and flow out from the outlet 76b. However, at this time, the fibrous foreign matter F is caught by the branch portion 76d where the flow path is branched between the starting portion and the outlet 76b, and the new fibrous foreign matter F is successively added to the caught fibrous foreign material F. The foreign matter is entangled and grows greatly, causing a new problem of clogging the circumferential flow path 76.
However, according to the flush toilet device 1 to which the pump device according to the present embodiment is applied, the circumferential flow path outer wall 64 of the pumping unit 36 has a substantially linear flow path provided downstream of the change point 76e. To increase the length, the rate of increase of the radius R2 of the circumferential flow path outer wall 64 downstream of the change point 76e is increased from a constant rate of increase of the radius R1 upstream of the change point 76e. The downstream circumferential flow path 76 is formed so as to increase the width W2.
Therefore, since the substantially linear flow path reaching the outlet 76b is relatively long, the orientation of the fibrous foreign matter F when the fibrous foreign matter F is directed toward the outlet 76b is oriented along the linear flow. To prevent the fibrous foreign matter F from being caught on the branch portion 76d, whereby new fibrous foreign matter F is entangled one after another with the caught fibrous foreign matter F and grows greatly. The clogging of the circumferential flow path 76 can be prevented.

Next, a pump device according to another embodiment of the present invention will be described.
A pump device according to another embodiment is a pump device having a function of pumping a liquid such as water.
This liquid may contain other components, such as water in which other components such as fertilizers are dissolved, drainage, sewage, muddy water, rainwater, river water, lake water, etc. The liquid may be a liquid other than water, for example, a solution.
A pump device according to another embodiment includes a pumping unit, a passage restricting unit, a drainage pipe, and the like of a crushing and pumping device 4 of a flush toilet device 1 to which the pump device of the above-described embodiment is applied, and other general pump devices. It is applied to That is, the structure of the pump device itself in the other embodiment has the same structure as the pump device applied to the flush toilet device 1 of the above-described embodiment, and performs the same operation and action. The description of the structure, operation, and action is omitted, and the relationship between the characteristic portions and other structures is simply supplemented below.

The pump device according to another embodiment is a passage restricting unit that allows a foreign substance having a size equal to or smaller than a predetermined value in the target liquid to pass therethrough, and a pumping unit that pumps the liquid that has passed through the passage restricting unit. When a liquid containing fibrous foreign matter flows in, a pumping section for pumping the liquid containing fibrous foreign matter, and a drain pipe for discharging the liquid pumped by the pumping section to the outside, have.
Fibrous foreign matter refers to a foreign matter that is in a fibrous state when passing through the passage restricting portion, for example, paper, cloth, thread, fibrous material, a fibrous object that is unraveled, Or a fibrous object derived from plants, animals, and living things, or a fibrous object derived from an inorganic compound, an organic compound, or the like, or having an elongated shape when passing through a passage restricting portion. Object or the like. In other words, the fibrous foreign matter is an object long enough to pass through the passage restricting portion, such that the fibrous foreign matter is easily caught in the flow path and entangled with another fibrous foreign matter. There may be. For example, the fibrous foreign substance may be a fibrous object derived from a plant or animal in a fertilizer solution in which a fertilizer is dissolved.

  Further, the pumping portion is disposed between the pumping portion and rotates in the pumping portion, an inflow port formed in a central portion of the pumping portion, and the pumping portion formed between the protrusion and the pumping portion. A radial flow path communicating with the inlet and extending toward the outer circumference, a circumferential flow path formed between the circumferential flow path outer wall of the pumping unit and the impeller, and extending circumferentially around the outer circumference of the impeller; , A centrifugal type pumping section comprising: the circumferential flow path of the pumping section has a narrowest starting portion provided at a position of 0 ° in the entire circumference thereof; and the circumferential direction of the pumping section. The outlet portion, which extends substantially linearly along a tangential direction of the flow path outer wall, and is formed so as to pass through a position at 360 ° outside the start portion; the start portion; and the outlet portion; A branch where the flow path branches between the outlet and the outlet. A straight portion connected to the outlet portion so as to form a passage, wherein the outer circumferential flow path outer wall of the pumping portion is located at a predetermined angle from the start portion at the 0 ° position. Until the change point, in the rotation direction of the impeller, the radius from the center of the pumping section to the outer wall of the circumferential flow path gradually increases at a constant increasing rate, and the width of the circumferential flow path gradually increases. The change point of the predetermined angle is formed at any position between 180 ° and 270 °, and the straight portion provided downstream of the change point is made longer. Increasing the rate of increase of the radius of the outer circumferential wall on the downstream side of the change point from the constant rate of increase of the radius on the upstream side of the change point; Formed to widen the width of the directional channel That.

Next, the operation and effect of the pump device according to the other embodiment described above will be described.
In the present invention configured as described above, in the pump device, the liquid containing the fibrous foreign matter that passes through the passage restricting section may flow into the pumping section. The fibrous foreign matter and liquid flowing from the inflow port into the pumping section flow from the radial flow path to the outer circumferential flow path by centrifugal force generated by rotation of the impeller. The foreign matter and the liquid in the circumferential channel flow around the circumferential channel and flow out of the outlet. However, at this time, the fibrous foreign matter is caught on the branch portion where the flow path is branched between the start portion and the outlet portion, and new fibrous foreign matter is entangled one after another with the caught fibrous foreign material. Together, they grow large, creating a new problem of clogging the circumferential channel.
However, according to the pump device of the present embodiment, the outer circumferential wall of the pumping section has a circumferentially outer flow path provided on the downstream side of the change point so as to extend the substantially straight flow path provided on the downstream side of the change point. The radial flow path outer wall is formed so that the rate of increase of the radius is larger than a constant rate of increase of the radius on the upstream side of the change point, and the width of the circumferential flow path on the downstream side of the change point is increased.
Therefore, since the substantially linear flow path leading to the outlet is relatively long, the posture of the fibrous foreign matter when the fibrous foreign matter is directed to the outlet is directed in a direction along the linear flow. To prevent the fibrous foreign matter from being caught on the branch portion, and thereby the new fibrous foreign matter is entangled one after another with the caught fibrous foreign matter and grows greatly, thereby clogging the circumferential flow path. Can be prevented.

  Further, according to the pump device according to another embodiment of the present invention, the outer wall in the circumferential direction of the pumping section has a substantially linear flow path provided on the downstream side of the change point. The rate of increase of the radius of the outer wall of the circumferential flow path on the downstream side is increased within a predetermined range from the constant rate of increase of the radius on the upstream side of the change point, and the width of the circumferential flow path on the downstream side of the change point is reduced. It is formed to spread. Therefore, since the substantially straight flow path connected to the outlet portion more reliably becomes longer, the posture of the fibrous foreign matter when the fibrous foreign matter is directed to the outlet portion is changed in a direction along the linear flow. The fibrous foreign matter can be more reliably prevented from being caught on the branch portion.

  Furthermore, according to the pump device according to another embodiment of the present invention, in the region from the change point to the straight portion, it is possible to suppress the waste and the washing water from being disturbed. Therefore, it is possible to prevent the waste and the washing water flowing out of the outlet from being disturbed.

DESCRIPTION OF SYMBOLS 1 Rinse toilet device 2 Toilet main unit 4 Crushing and pumping device 6 Indoor water supply pipe 8 Indoor drainage pipe 10 Floor 12 Leg 14 Armrest 16 Building 16a Indoor 16b Outdoor 18 Outdoor water supply pipe 20 Outdoor drainage pipe 22 Bowl part 24 Water supply device 26 Drain trap pipe Channel 28 Water supply valve 30 Water channel 32 Outlet 34 Crushing unit 36 Pumping unit 38 Electric motor 40 Operating unit 42 Notification unit 44 Control unit 46 Storage tank 48 Crushing chamber 48a Peripheral wall 48b Passing opening 50 Disk 50a Protrusion 52 Rotating shaft 54 Flow path 56 Pump chamber 57 Lower cover 58 Inflow port 60 Outflow port 62 Impeller 64 Circumferential flow path outer wall 66 Disk portion 68 Projecting portion 68b Outer side wall surface 74 Radial flow path 76 Circumferential flow path 76a Start portion 76b Outflow portion 76c Straight portion 76d Branch part 76e Change point 76f Corner part 76g Outlet outside wall 76h Inlet 76i Port 136 Pumping part 164 Circumferential flow path outer wall 176 Circumferential flow path 176a Start part 176b Outlet part 176d Branch part 176f Corner part 176i Inlet A1 Arrow A2 Arrow A3 Arrow C Center D1 Rotation direction D2 Tangential direction F Foreign matter L1 Distance L2 Distance r1 Radius R1 Radius R2 Radius R3 Radius W1 Width W2 Width W3 Width

Claims (3)

A pump device for pumping a liquid,
A passage restricting portion that allows a foreign substance having a size equal to or less than a predetermined size in the target liquid to pass therethrough,
A pumping unit that pumps the liquid that has passed through the passage regulating unit, and a pumping unit that pumps the liquid that includes the fibrous foreign matter when the liquid that includes the fibrous foreign matter flows in,
A drain pipe for discharging the liquid pumped by the pumping unit to the outside,
The pumping section is
An impeller arranged inside the pumping unit and rotating in the pumping unit;
An inflow port formed at the center of the pumping section,
An outlet formed on the outer peripheral portion of the pumping section,
A radial flow path extending from the inflow port to the outer periphery on the impeller,
A centrifugal pumping section having a circumferential flow path formed between the outer peripheral wall of the pumping section and the impeller, and extending circumferentially around the outer periphery of the impeller;
The circumferential flow path of the pumping unit,
A narrowest starting portion provided at a position of 0 ° in the entire circumference;
An outlet portion extending substantially linearly along a tangential direction of the outer circumferential wall of the pumping portion and passing through a 360 ° position outside the start portion ;
A branch portion in which a flow path is branched between the start portion and the outlet portion,
A straight portion connected to the outlet portion so as to form a linear flow path with the outlet portion,
With
From the start portion at the 0 ° position to a change point formed at any position of 180 ° to 270 °, the circumferential flow path outer wall of the pumping section is oriented in the rotational direction of the impeller, The radius from the center of the pumping portion to the outer wall of the circumferential flow path is gradually increased at a constant increase rate, and is formed so as to gradually increase the width of the circumferential flow path. The rate of increase of the radius of the outer circumferential wall on the downstream side is increased from the constant rate of increase of the radius on the upstream side of the change point, and the width of the circumferential flow path on the downstream side of the change point is increased. The pump device is configured such that the straight portion is longer than in a case where the radius of the circumferential flow path side wall is increased at a predetermined increase rate without providing the change point .   The circumferential flow path outer wall of the pumping unit is in the vicinity of a change point of the circumferential flow path outer wall, from a center of the pumping unit in a region downstream of the change point to the circumferential flow path outer wall. Is formed in a range of 1.2 times or more and 20 times or less of the rate of increase of the radius from the center of the pumping portion to the outer wall of the circumferential flow path in the upstream region of the change point. The pump device according to claim 1, wherein:   3. The pump device according to claim 1, wherein the outer circumferential wall of the pumping unit has a substantially constant rate of increase in radius in a region from the change point to the straight portion. 4.

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