JP2003082724A - Sewage force feed device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewage force feed device 48 for further lowering the height up to a sewage inflow chamber 20 from a floor to lower a position a toilet bowl. SOLUTION: A submerged motor chamber 22 for housing a submerged motor 28 is arranged under the sewage inflow chamber 20 for arranging a large number of outflow holes in a side wall, and a pump chamber 24 is arranged under the submerged motor chamber 22. An impeller 32 is fixed to a lower end part of a pump shaft 30 projecting to the pump chamber 24 from the submerged motor 28 by penetrating through a lower side partition wall 36 between the submerged motor chamber 22 and the pump chamber 24. Two oil seals 40 and 42 for penetrating the pump shaft 30 are arranged at an interval in the shaft direction on the lower side partition wall 36, and a lubricating liquid chamber 50 opening toward the pump shaft 30 is arranged between the two oil seals. A lubricating liquid is supplied to the lubricating liquid chamber 50 by pressure higher than pressure for forcibly feeding sewage by the impeller 32 from a lubricating liquid pressure supply means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage pumping device for forcibly pumping sewage that has flowed into a sewage tank from a flush toilet or the like to the outside and discharging it.

[0002]

2. Description of the Related Art Generally, sewage obtained by washing a flush toilet is
It is discharged to sewers and septic tanks by gravity flow using gravity. However, when gravity is difficult to naturally flow, sewage is naturally flown to a sewage tank, and the sewage collected in this sewage tank is forcibly sent to an external sewer or septic tank to be discharged. .

An example of a conventional sewage pumping device will be described with reference to FIGS. 4 and 5. FIG. 4 is an overall configuration diagram of a system using a conventional sewage pumping device. FIG. 5: is sectional drawing which shows the shaft sealing structure of the pump shaft of the conventional sewage pumping device.

In FIGS. 4 and 5, a toilet bowl 12 and a waste water tank 16 connected to the toilet bowl 12 by a connecting pipe 14 are provided on a floor 10.
Is provided. In the sewage tank 16, the sewage pumping device 1
8 are provided. The sewage pumping device 18 includes a sewage inflow chamber 20, an underwater motor chamber 22, and a pump chamber 24 which are sequentially arranged from top to bottom, and the connection pipe 14 is connected to the sewage inflow chamber 20 by a connecting pipe 26. The connection pipe 14 is provided with an inclination of an angle θ, and the wash water in the toilet bowl 12 flows into the dirty water inflow chamber 20 by natural flow. A large number of outflow holes are formed in the side wall of the wastewater inflow chamber 20, and the inflowing wastewater flows down into the wastewater tank 16 from the outflow holes. And the dirty water tank 1
When a predetermined amount of dirty water is collected in 6, the underwater motor 28 housed in the underwater motor chamber 22 is driven and rotated, and the pump chamber 2
4 impeller 32 fixed to pump shaft 30 protruding into
Is rotated and the waste water is pumped and discharged to the sewer or the septic tank outside the waste water tank 16 through the discharge pipe 34. An appropriate cutter (not shown) is fixed to the pump shaft 30 protruding into the dirty water inflow chamber 20 so that the solid matter that cannot pass through the outflow hole is cut into an appropriate size. Further, it goes without saying that the waste in the waste water tank 16 is appropriately configured to flow into the pump chamber 24.

[0005]

In the above-mentioned conventional example, in order for the waste water in the toilet bowl 12 to naturally flow down to the waste water tank 16, the larger the inclination angle θ of the connecting pipe 14 is, the better the position of the toilet bowl 12 is. High is desirable. On the other hand, when a child or a person with a short height sits on the toilet bowl, if the toilet bowl 12 is high, the legs float from the floor 10, making it difficult to use, and it is desirable that the toilet bowl 12 be located at a low position. Therefore, the connecting pipe 14
In order to reduce the height of the toilet 12 while keeping the inclination angle θ of the predetermined value at a predetermined value, the height h from the bottom surface of the sewage tank 16 to the sewage inflow chamber 20 into which sewage flows must be short.

Here, in the conventional sewage pumping device 18, the lower partition wall 3 between the submersible motor chamber 22 and the pump chamber 24.
6, the pump shaft 30 of the submersible motor 28 penetrates and projects into the pump chamber 24. The shaft sealing structure is as follows. First, the pump shaft 30 is rotatably supported by a bearing 38, and two oil seals 40 and 42 through which the pump shaft 30 penetrates are arranged at intervals in the axial direction.
Mechanical seal 4 between the two oil seals 40 and 42
4 are provided. The lower partition wall 36 is provided with a lubricating liquid pool 46 that opens toward the mechanical seal 44, and a predetermined amount of lubricating liquid is appropriately filled in the lubricating liquid pool 46.

The mechanical seal 44 is provided in the impeller 32.
The pressure of pumping sewage by the rotation of the
4 to prevent leakage into the submersible motor chamber 22 and is essential for reducing the pressure difference applied to the oil seals 40 and 42 in the axial direction. Therefore, the submersible motor room 2
The substantial thickness of the lower partition wall 36 between the pump 2 and the pump chamber 24 becomes large, and the height h from the bottom surface of the sewage tank 16 to the sewage inflow chamber 20 must be large. As a result, there was a problem that the position of the toilet bowl 12 could not be lowered so much in order to make the inclination of the connecting pipe 14 a predetermined angle θ.

The present invention has been made in view of the above-mentioned circumstances of the prior art, and provides a sewage pumping apparatus which can lower the height from the floor to the sewage inflow chamber so that the position of the toilet can be lowered. The purpose is to provide.

[0009]

In order to achieve such an object, the sewage pumping apparatus of the present invention comprises a submersible motor chamber for accommodating an underwater motor under a sewage inflow chamber having a large number of outflow holes in a side wall. A pump chamber is provided below the submersible motor chamber, and an impeller is provided at a lower end portion of a pump shaft that penetrates a lower partition between the submersible motor chamber and the pump chamber and projects from the submersible motor into the pump chamber. In the sewage pumping device for fixedly pumping sewage to the outside from the pump chamber, two shaft sealing members, through which the pump shaft penetrates, are provided in the lower partition wall at intervals in the axial direction. A lubricating liquid chamber opened toward the pump shaft is provided between two shaft sealing members, and the lubricating liquid is supplied to the lubricating liquid chamber at a pressure higher than the pressure at which the impeller impeller pumps the waste water. Configured to supply

The pump shaft projecting from the submersible motor to the sewage inflow chamber through the upper partition between the sewage inflow chamber and the submersible motor chamber is set so that the upper end of the pump shaft is higher than the maximum water level of the sewage. A first tubular member coaxially loosely fitted to the pump shaft protruding into the wastewater inflow chamber is installed in a watertight manner on the upper partition wall so that its upper end is higher than the maximum water level of the wastewater. A second tubular member that is coaxially loosely fitted to the first tubular member is connected at its upper end to the upper end of the pump shaft, and a cutting member is fixed to the outer periphery of the second tubular member. It may be configured with.

Further, the two shaft sealing members provided on the lower partition may be oil seals.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a vertical sectional view of an embodiment of the sewage pumping apparatus of the present invention. FIG. 2 is an external view of the dirty water pumping device of FIG. FIG. 3 is a longitudinal sectional view of an example of a lubricating liquid pressure supply means for supplying the lubricating liquid to the lubricating liquid chamber of FIG. 1 at a predetermined pressure. In FIGS. 1 and 2, the same or equivalent members as those in FIGS. 4 and 5 are designated by the same reference numerals, and overlapping description will be omitted.

Similar to the conventional sewage pumping device 18, the sewage pumping device 48 of the present invention comprises a sewage inflow chamber 20, a submersible motor chamber 22 and a pump chamber 24 which are sequentially arranged from the top to the bottom, and the sewage tank 16 Is disposed inside. And connection pipe 1
The waste water flows into the waste water inflow chamber 20 from 4 through the connecting pipe 26, and the rotation of the impeller 32 causes the waste water in the pump chamber 24 to be pumped and discharged to the external sewer or the purified water tank through the discharge pipe 34. .

The sewage pumping device 48 of the present invention is different from the conventional example in the following points. Submersible motor 2
8, the pump shaft 30 has a submersible motor chamber 22 and a pump chamber 24.
The lower wall 36 is penetrated, but the shaft sealing structure is as follows. First, the pump shaft 30 is the bearing 3
Oil seal 4 as two shaft sealing members that are axially supported by 8 and that have a gap in the axial direction and through which the pump shaft 30 penetrates.
0 and 42 are provided and these two oil seals 4
A lubricating liquid chamber 50 opened toward the pump shaft 30 is provided between 0 and 42. Further, two communication pipes 52a for communicating the lubricating liquid chamber 50 with the outer peripheral portion are connected to the lower partition wall 36.
52b is drilled. One of the communication pipes 52a is, as shown in FIG. 2, a lubricating liquid pressure supply means 5 appropriately provided inside or outside the waste water tank 16 via a communication connection pipe 54a.
6 is connected. The other communication pipe 52b is connected to a shutoff valve 58 provided outside the dirty water tank 16 via a communication connection pipe 54b. The lubricant pressure supply means 5
6 may be directly connected to the open end of the communication pipe 52a without passing through the communication connection pipe 54a. Further, the open end of the communication pipe 52b may be directly closed by an appropriate plug or the like without providing the communication connection pipe 54b and the shutoff valve 58.

Further, the pump shaft 30 of the submersible motor 28 is
The upper partition wall 60 between the submersible motor chamber 22 and the dirty water inflow chamber is penetrated, and its tip is set to be higher than the maximum water level of the dirty water accumulated in the dirty water tank 16. The shaft sealing structure in which the pump shaft 30 penetrates the upper partition wall 60 is rotatably supported by a bearing 62, and further an oil seal 64 as one shaft sealing member is provided. Also, the first tubular member 66, which is coaxially loosely fitted to the pump shaft 30 protruding into the dirty water inflow chamber 20, has its upper end higher than the maximum water level of the dirty water, and its lower end is the upper partition wall 60. Sewage inflow chamber 2
It is erected in a watertight structure on the 0 side. Further, the second tubular member 68, which is coaxially loosely fitted to the outer periphery of the first tubular member 66,
The upper end of the pump shaft 30 is appropriately connected and fixed to the upper end of the pump shaft 30. Appropriate cutters 70, 70 as a blocking member are appropriately fixed to the outer circumference of the second tubular member 68.

Next, the structure of an example of the lubricating liquid pressure supply means 56 will be described with reference to FIG. A bellows 74 having a closed end is provided in a container-shaped inner case 72, and a ring plate 76 provided at the rear end of the bellows 74 is brought into contact with the open end surface of the inner case 72. Then, the male screw provided on the outer circumference of the opening end of the inner case 72 is screwed into the female screw provided on the inner circumference of the open end of the outer case 78, so that the ring plate 76 is pinched and fixed and the ring plate 76 and the outer case are fixed. The O-ring 80 provided between 78 is elastically deformed by pressing, and the space between the inner case 72 and the bellows 74 is sealed. And inner case 7
One end of the communication connection pipe 54a is communicated with the tip end of 2. Further, the rod 82 is inserted into the bellows 74, and its tip is fixed to the closing plate at the tip of the bellows 74. The coil spring 84 is loosely fitted around the rod 82. Outer case 7
The rear end side of 8 has a small diameter through which the rod 82 and the coil spring 84 loosely fitted can be inserted, and a male screw is provided on the outer periphery of the rear end. Then, a female screw provided on the inner circumference of a cylindrical adjustment case 86 whose rear end is closed is screwed into this male screw. The coil spring 84 more strongly presses the tip of the bellows 74 as the adjusting case 86 is screwed into the outer case 78. Therefore, the lubricating liquid injected into the space between the inner case 72 and the bellows 74 in the hermetically sealed state is cooled by the coil spring 84.
The pressure depends on the elasticity of. A watertight seal is appropriately wound around the screwed portion of the inner case 72 and the outer case 78, and the screwed portion has a watertight structure. Of course, the inner case 72, the communication connection pipes 54a and 54b, and the screwed portions of the communication pipes 52a and 52b also have a watertight structure as appropriate.

In the lubricating liquid pressure supply means 56, first, the bellows 74 is taken out and the inner case 72 is filled with the lubricating liquid. Then, the bellows 74 is incorporated into the inner case 72, the outer case 78 is further screwed and inserted, and the shutoff valve 58 is opened. 50 and communication pipes 52a, 5
The air in 2b and the communication connecting pipes 54a, 54b is discharged through the shutoff valve 58, and the shutoff valve 58 is closed when all the air is discharged. Then, the adjustment case 86 is further screw-inserted to adjust and set the pressure of the lubricating liquid in the lubricating liquid chamber 50 to a predetermined value. Although not shown, the pressure of the lubricating liquid can be easily measured by appropriately connecting a pressure gauge or the like to the communication connection pipes 54a and 54b. Then, the magnitude of the predetermined value for adjusting the pressure of the lubricating liquid is set to be a pressure higher by 10 to 20 kPa than the pressure for pumping the dirty water by the rotation of the impeller 32.

In the sewage pumping device 48 of the present invention having the above-described structure, the mechanical seal 44 is omitted as compared with the conventional sewage pumping device 18, and the lubricating liquid which may be extremely shorter than the axial dimension of the mechanical seal 44. Since the chamber 50 is provided, the lower partition wall 3 between the submersible motor chamber 22 and the pump chamber 24 is provided.
The substantial thickness of 6 can be made thinner than the conventional example. Therefore, from the bottom of the sewage tank 16 to the sewage inflow chamber 20
The height h can be significantly shortened. Therefore,
The height of the toilet bowl 12 can be reduced without reducing the inclination angle θ of the connecting pipe 14.

Here, by the lubricating liquid pressure supply means 56,
By setting the pressure of the lubricating liquid in the lubricating liquid chamber 50 higher than the pressure at which the impeller 32 pumps the sewage, the sewage does not leak from the pump chamber 24 to the submersible motor chamber 22, which has been indispensable in the past. Even if the mechanical seal 44 is omitted, no trouble will occur.

The pump shaft 30 protruding into the waste water inflow chamber 20 is provided with a first watertightly erected upper partition wall 60.
The tubular member 66 is loosely fitted to a position higher than the maximum level of the dirty water, and the dirty water in the dirty water inflow chamber 20 does not leak to the submersible motor chamber 22 along the pump shaft 30.

In the above embodiment, the lubricating liquid chamber 50
In addition, although the lubricating liquid having a predetermined pressure is supplied from the lubricating liquid pressure supply means 56 having the structure shown in FIG. 3, the invention is not limited to this, and the lubricating liquid is supplied to the lubricating liquid chamber 50 at a predetermined pressure. Then, the supply means may have any structure,
Further, the supply means may be installed in any place other than the submersible motor chamber 22 and the pump chamber 24. Then, with respect to the pump shaft 30 penetrating the upper partition wall 60, the lower partition wall 36
A shaft seal structure similar to the above may be adopted. If the shaft sealing structure of the upper partition wall is similar to that of the lower partition wall 36, even if the tip of the pump shaft 30 is at a position lower than the water level of the waste water, the waste water inflow chamber 2
No dirty water leaks from 0 to the submersible motor chamber 22.

[0022]

As is apparent from the above description, since the sewage pumping apparatus of the present invention is constructed, the following special effects are exhibited.

In the sewage pumping device according to claim 1,
Since the lubricating liquid chamber provided between the two shaft sealing members arranged on the lower partition wall between the submersible motor chamber and the pump chamber is supplied with the lubricating liquid having a pressure higher than that of pumping the waste water by the impeller, Dirty water will not leak from the pump room to the submersible motor room. The lubricating liquid chamber can have a shorter axial length than the mechanical seal, which is indispensable in conventional devices of this type, and the height from the bottom of the sewage tank to the sewage inflow chamber of this device can be increased. Can be lowered. Therefore, the height of the toilet provided with the connecting pipe having the gradient necessary for allowing the sewage to naturally flow into the sewage inflow chamber can be set to be lower than in the conventional case.

In the sewage pumping device according to claim 2,
The pump shaft protruding into the dirty water inflow chamber is loosely fitted to the first cylindrical member up to a position higher than the maximum water level of the dirty water, and the first cylindrical member serves as an upper partition between the dirty water inflow chamber and the submersible motor chamber. Since it is arranged in a watertight manner, there is no risk of sewage leaking into the submersible motor chamber along the pump shaft.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the sewage pumping apparatus of the present invention.

FIG. 2 is an external view of the dirty water pumping device of FIG.

FIG. 3 is a vertical cross-sectional view of an example of a lubricant pressure supply means for supplying a lubricant to the lubricant chamber of FIG. 1 at a predetermined pressure.

FIG. 4 is an overall configuration diagram of a system using a conventional sewage pumping device.

FIG. 5 is a cross-sectional view showing a shaft sealing structure of a pump shaft of a conventional wastewater pumping device.

[Explanation of symbols]

10 floors 12 toilet bowl 14 Connection pipe 16 dirty water tank 18,48 Sewage pumping device 20 Sewage inflow chamber 22 Underwater motor room 24 pump room 26 Communication pipe 28 Submersible Motor 30 pump shaft 32 impeller 34 Discharge pipe 36 lower bulkhead 40, 42, 64 oil seal 50 Lubricant chamber 52a, 52b communication pipe 54a, 54b Communication connection pipe 56 Lubricating liquid pressure supply means 58 Shut-off valve 60 Upper partition 66 First tubular member 68 Second tubular member 70 cutter

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Makoto Yoshino             3-27 Miyoshi-cho, Mishima City, Shizuoka Prefecture             Industrial Machinery Works Mishima Works (72) Inventor Masanobu Watanabe             1-5-1, Omorikita, Ota-ku, Tokyo Stocks             Company Denkisha Machinery Works F-term (reference) 2D061 AA03 AB05

Claims (3)

[Claims] 1. An underwater motor chamber for accommodating an underwater motor is provided under a dirty water inflow chamber having a large number of outflow holes on a side wall,
A pump chamber is provided below the submersible motor chamber, and an impeller is fixed to a lower end portion of a pump shaft protruding from the submersible motor to the pump chamber through a lower partition between the submersible motor chamber and the pump chamber. In the sewage pumping device for pumping sewage from the pump chamber to the outside, two shaft sealing members, through which the pump shaft penetrates, are provided in the lower partition wall at intervals in the axial direction, and the two shafts are provided. A lubricating liquid chamber opened toward the pump shaft is provided between the sealing members, and the lubricating liquid is supplied to the lubricating liquid chamber at a pressure higher than the pressure at which the impeller impeller pumps the dirty water. A sewage pumping device having the above structure. 2. The sewage pumping apparatus according to claim 1,
The pump shaft protruding from the submersible motor to the sewage inflow chamber through the upper partition between the sewage inflow chamber and the submersible motor chamber is set such that the upper end of the pump shaft is higher than the maximum water level of the sewage. A first tubular member coaxially loosely fitted to the pump shaft projecting into the chamber is installed in a watertight manner on the upper partition wall so that the upper end of the first tubular member is higher than the maximum water level of the sewage.
A second tubular member that is coaxially loosely fitted to the first tubular member is connected at its upper end to the upper end of the pump shaft, and a cutting member is fixed to the outer periphery of the second tubular member. A sewage pumping device characterized by being configured as follows. 3. The sewage pumping device according to claim 1, wherein the two shaft sealing members provided on the lower partition wall are oil seals.