JPS6059440B2 - waste water pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wastewater pump, and more particularly to a wastewater pump having a structure in which a motor is connected to the motor and the pump body is freely immersed in a discharge medium.

Wastewater typically contains various contaminants, such as fibrous materials, vegetable components, baby bounty products, and other contaminants.

These contaminants are either not easily discharged by the pump or make normal pumping operations extremely difficult, and therefore conventional methods have been proposed to enable or facilitate the discharge of wastewater. Many proposals have been made for this purpose. These proposals include, for example, shredding the contaminants contained in the discharged material before it enters the pump or in the discharge means. It goes without saying that the shredding is carried out to a size that allows the foreign matter to be pumped out without any particular difficulty. From the above point of view, various types of wastewater pumps equipped with shredding mechanisms have been proposed.

Some of the chopping mechanisms can be formed directly in the suction opening area as blades fixed to the pump impeller and rotating therewith, or as cutting edges fixed to the pump impeller and rotating. The shearing elements can be configured as shearing elements in the form of ribs) and cutting fins, or as a separate chopping unit that can be driven by the pump shaft and arranged upstream of the suction opening. Such a shredding mechanism or shredding unit considerably increases the power consumption of the pump.

Therefore, the main object of the present invention is to provide a wastewater pump equipped with a shredding device that operates satisfactorily with low drive power and has high shredding performance. It is further an object of the present invention to minimize blockage of the suction opening, as can easily occur when large textile fibers, woven bags or similar fiber mixtures are drawn into known pumps. There is provided a waste water pump having a shredding device that reliably prevents. The problems of the prior art described above can be solved by the wastewater pump of the present invention.

The wastewater pump of the present invention includes a motor and a pump connected to the motor, and the assembled structure of the motor and the pump is immersible in wastewater and the area of the suction opening or the pump is connected to the motor and the pump. In a wastewater pump comprising a shredding device disposed in a suction opening for shredding suctioned contaminants, one member is stationary while the wastewater pump is in operation, and the other member is rotated by the motor; two mutually cooperating elements are provided in the area of the suction opening, thereby periodically opening and closing the opening for the passage of foreign matter;
two members form a chopping device, and the stationary member is a tube having an end shape for said chopping, and said rotating member is a jig in said tube and a side surface for said chopping. having a shape, the side shape being configured to cooperate with the end shape to periodically open and close the opening and shred and retain or eject the contaminants. The retaining or ejecting means are arranged such that they function intermittently for very limited periods of time.
In this case, each shredding device such as a cutting edge (cutting rib), cutting fin, cutting blade, etc. is configured to be connected to the above-mentioned ejection means, and is configured to not only cut (shred) but also hold or eject. It is also configured to perform the following functions. As a result, under the influence of the suction action of the medium that the pump is pumping out, after cutting the fiber mixture fed to the shredding device, the cut fiber mixture (contaminants) is discharged out of the area of the shredding device. What is done is done. The fiber mixture is then supplied intermittently to the shredding device, and this intermittent supply is realized by the fact that the device for holding and discharging the fiber mixture is formed as a device that generates a pulsating suction flow. achieved by things. From a structural point of view, the wastewater pump according to the invention can include various embodiments.
In one embodiment, the shredding device can be formed as a mechanical unit connectable to a suction opening, with a tubular socket being removably attached to the suction opening. ing. The free end of the tubular socket is shaped in the axial direction, and the distal end is formed in a corrugated or sawtooth shape, and the tubular socket has a structure from which a jig that rotates together with the pump shaft projects. It's summery. On the other hand, the jig has a side surface shape that matches the shape of the end surface of the tubular socket within a range limited by the wall of the tubular socket, and the shape includes at least a cutting blade or a cutting edge that protrudes into the wall of the tubular socket. Has ribs. The cutting blades or cutting ribs may likewise be wavy or serrated around the jig, in which case the waving or serrations of the cutting blades or cutting ribs of the jig are It is desirable that the swing width corresponds to or is slightly larger than the swing width at the free end of the tubular socket. Preferably, the corrugation at the end of the tubular socket can vary according to the number of corrugations of the cutting blade of the jig. Preferably, the number of corrugations in the jig is greater than the number of corrugations in the tubular socket. It is also known that the ratio of the numbers of waveforms described above is preferably from 3:2 to 5:3. The tube (tubular socket) has a cylindrical shape and can be adjusted about the tube to obtain a match between the end shape of the tube and the cutting edge (cutting rib) or cutting fin of the jig in the tube. When inserting and fitting a jig into the tube, it is preferable to make the tube into a cylindrical shape.

However, if a good compatibility has to be ensured between the two in order to obtain good shredding efficiency, both parts should be compatible with each other even in the event of relatively slight wear and tear. This results in having to be replaced.
These problems can be prevented by further embodiments of the present invention.

That is, among the surfaces of the tube, at least the surface that cooperates with the jig is formed into a conical shape, so that the distance between the two cooperating surfaces can be changed by displacement in the axial direction. In this case) at least one of the two parts can be displaced towards the other under the influence of a spring force, so that the two parts are always arranged close to each other by means of a slight pressure. It is also possible to suitably configure it so that.
From a structural point of view, even in the above case, it is possible to obtain various embodiments as described below.

For example, the tube can be configured so that its conical portion tapers outwardly.

It is also possible for the tube to be designed in its conical section so that it becomes wider outwardly. In both cases the tube projects outwardly from the suction opening. However, it is equally possible for the tube to project from the suction opening into the pump chamber. In this case, the tube can preferably protrude into the free space that may often exist in the pump chamber between the boss of the pump impeller and the inner edge of its vane. The boss of the pump impeller itself can, if desired, be configured as a fixture over at least part of its length. Such an arrangement with a tube projecting inwardly into the pump chamber is particularly suitable for working with a closed pump impeller rather than an open pump impeller. Furthermore, if desired, it is possible for the tube to project in both directions, outwardly and inwardly into the pump chamber; it is only possible to project the tube both inwardly and outwardly. First, it is also suitable for cylindrical tubes.

The tube can then be formed into a ring with edges extending both outwardly and inwardly. In this case, the tube can form an edge that extends not only outward but also inward. The conical shape of the tube has different slopes along its entire length, and especially towards the ends. The jig can be configured to have a joint, and the jig can be constructed from at least two parts. Finally, the tube is formed into a loop such that one end of the tube can extend up to the entire length of the tube, in which case its slope is increased over the entire length of the tube. It is preferable to form a conical shape so that the distance is constant. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The wastewater pump according to the present invention will be described in more detail below based on the accompanying drawings and embodiments.

FIG. 1 shows the lower part of the immersion type wastewater pump according to the present invention, and is a partial sectional view of the pump chamber.

FIG. 2 is a detailed cross-sectional view taken along line 2-2 in FIG. 1. Third
The figures are diagrams showing the side profile of one end of the suction pipe and the other diagram showing the transition of the cutting blade relative to the jig. Figure 4 shows an example of a jig with a preferred shape.
A configuration having five waveforms corresponding to the above-mentioned FIG. 3 is shown. FIG. 5 shows another embodiment of the invention, which includes a shredding device having a conical outwardly projecting tubular socket. FIG. 6 shows a further modification of the invention including a conically shaped tubular socket, and FIG. 7 shows a modification of FIG. 3 with a tubular socket projecting into the pump chamber portion; FIG. 8 shows a fourth modification of the present invention, in which a tubular socket projects inward and outward from the pump chamber. Among the above figures, the pump structure shown in FIG. 1 is composed of one motor and a pump connected to the motor, and is housed in a common casing 11.

The lower part of the casing 11 is a pump chamber 12, and a motor shaft 13 is disposed as a pump shaft in the pump chamber 12. A pump impeller 14 is disposed on the motor shaft 13, and the pump impeller 14 is disposed in the pump chamber 12. For the wheel 14, together with its free-edged wings 141, a spiral or friction plate 121 is provided at a small distance above the floor of the pump chamber 12, which friction plate 121 is connected to the suction opening 15. Said suction opening 15 is equipped with a tubular socket 16 as part of a shredding device according to the subject of the invention.

A jig 17 is inserted into the tubular socket 16, and a wavy rib 171 is provided around the jig 17, and the wavy rib 171 reaches the inner wall surface of the tubular socket 16. The jig 17 is arranged on an extension of the motor shaft or pump shaft 13 and rotates together with the shaft 13. The free end 161 of the tubular socket 16 and the end of the wavy side profile coincide. The shapes of both side surfaces, that is, the side ends of the tubular socket 161 and the side ends of the wavy ribs 171 are configured to coincide at the ends, as schematically shown in FIG. 3.
In FIG. 3, the side shape of the wavy rib 171 is shown by a solid line, and the side shape of the tubular socket 161 is shown by a wavy line. When the wastewater pump according to the present invention is rotating, the free end 161 of the socket 16 and the jig 17
There is always a relative displacement between the rib 171 and the rib 171.

For this reason, when the pump is rotating, said jig 17 rotates and thus the corrugated side profiles are mutually displaced, so that an opening for the discharged substance is constantly formed and closed. The flow is carried out through a free passage cross section constituted by the corrugated ribs in the part of the fixture 17 at the end of the tubular socket 16 through the wave valleys 162, 163, 164 of the side profile acting as inflow openings. constantly fluctuating in response to Therefore, the contaminants are sucked into the flow opening formed during the suction process of the pump. Then, in the direction of rotation (arrow 172), the branch 175 of the corrugated cutting rib 171 is moved by the blade 165 of the tubular socket 16 in the fixed state.
Move the sides of. At this time, the part of the contaminants sucked into the flow opening will be shredded. In this case, the slope of the cutting blades that come into mutual action is relatively small, so that very few cutting blades are required. Wave-shaped cutting blade 1
The part of the branch 175 formed at 71 and falling subsequently is
Before forming a new inflow opening, this portion of the branch 175 is in a position to push the front end of the next debris fragment to at least a small distance from the immediate area of the cutting blade. In this state, a constant alternation of suction and cutting takes place, and from time to time extrusion and new suction, cutting, etc. take place, with simultaneous constant opening and closing of the flow openings. As described above, the occurrence of a blocked state of the inflow opening is prevented through the pulsating and repeated flow. The operation of pushing the suctioned portion and the generation of a pulsating flow are performed when the base of the jig 17 as a whole matches the wave-shaped side surface shape of the cutting rib, as shown in the overview diagram in FIG. This is satisfied when configuring a profile. Figure 4 shows 5
This figure shows a jig having several waveforms. Fifth
In the figure, the wastewater pump according to the present invention is composed of one motor and a pump connected to the motor, as is conventionally known, and these are all housed in a common casing 51. There is.

A motor shaft 53 projects into the pump chamber 52 as a pump shaft, and a pump impeller 54 is disposed on the pump shaft. The blades 541 of the pump impeller 54 are arranged above the floor of the pump chamber 52 so that, when placed on the floor, they rotate with a slight spacing from the turning plate or friction plate 521. The spiral plate or friction plate 521 constitutes the suction opening of the pump housing. A tubular socket 56 is fitted into the suction opening 55, which constitutes a portion 561 projecting downwardly beyond the floor of the pump chamber, and which extends downwardly and outwardly into a conical shape. It has a tapered shape.

The conical end 561 of the tubular socket 56 is configured to mate with the end of the wavy side portion. The motor shaft 5 also projects through the pump impeller 54.
3 is disposed so that its entire ring constitutes a conical jig 57, and a wavy edge 571 is formed on the jig 57. Further, the configuration is such that the conical portion of the wavy edge 571 matches the conical portion of the tubular sockets 56 to 561. A dish-shaped spring 59 is provided between the jig 57 and the wavy end portion 53.
Therefore, the jig 57 is held pressed against the inner wall portion of the tubular socket 56 by the spring force of the spring 59. The embodiment shown in FIG. 6 is a modification of the embodiment shown in FIG. 5, and the difference from the embodiment shown in FIG. A suction opening 65 surrounded by a spiral plate 621 of the tubular socket 6'6 arranged in It has an inverted conical shape and expands outward.
In a similar manner, the jig 67 disposed at the lower end of the motor shaft 63 is also formed into a conical shape so that its wavy edge 671 fits into the outwardly expanding portion of the inverted conical shape. The jig 67 is the shaft 6
The structure is such that it can be freely displaced in the axial direction by a jig provided at 31, and is pressed against a conical tubular socket 661 via a dish-shaped spring 69. There is. The embodiment shown in FIG. 7 is characterized in that a tubular socket 76 provided in a suction opening 75 arranged in the floor of the casing 71 extends at its outer edge 761 into the interior of the pump chamber 72. It is something that has.

The outer edge 761 not only extends into the pump chamber, but also forms a free end at the inner peripheral portion of the blade 741 of the pump impeller 74. The conical portion of the tubular socket 76 has a structure that matches the conical outer shape of the jig 77, and the shape of the jig 77 corresponds to the shape of the jig 57 shown in FIG. 5 above. There are things to do. Also, similar to the previous embodiment, the dish-shaped spring 7
9, it is pressed against the tubular socket 76. FIG. 8 shows the possibility of yet another embodiment; in this embodiment, a tubular socket 86 housed in a casing 81
is a structure that includes a portion 862 that protrudes inwardly as well as a portion 861 that protrudes outwardly. The tubular socket 86 is constructed from a conical body that exhibits the same slope over its entire length, but its overall height differs in different parts of the tubular socket. The outwardly and inwardly projecting edge portions 861 and 862 of the casing 81 are shaped in accordance with the previous embodiment examples. The tubular socket 86 has a jig 87 below a spring 89 mounted intermediately from the end of the motor shaft 83, and supports the spring 89. Further, the jig 87 has a wave-shaped end shape 871,
The end shape 871 is the outer end portion 86 of the tubular socket.
1 to the opposite inner edge portion 862. This place. In this case, the external shape of the jig is the above-mentioned tubular socket 86.
includes the outer shape of the inner edge portion 862 as well as the outer shape 861 of Includes parts that are not included. It is. In the illustrated embodiment, all of the cutting ribs of the jig have a wave shape, but sawtooth cutting ribs may also be used.

According to the present invention, the foreign matter is reliably shredded, so that the suction opening of the pump, the pump impeller, etc. will not be clogged.

A waste water pump is thus provided which operates reliably even in media in which fiber mixtures (contaminants) are present.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of the pump chamber showing the lower part of the immersion type wastewater pump according to the present invention, and Fig. 2 is Fig. 1 2-2.
Figure 3 is a detailed cross-sectional view along the line, one shows the outer surface shape at the end of the suction pipe, the other shows the transition of the cutting blade relative to the jig, and Figure 4 shows the jig. This figure shows an example of a preferable shape, and corresponds to the above-mentioned figure 3.
Explanatory diagram showing a type of waveform having 5 waveforms, 5th
The figure shows another embodiment of the present invention, and is a structural explanatory diagram of a wastewater pump including a shredding device having a tubular socket projecting outward in the form of a circular fiber. FIG. 6 is a further modification of the present invention. FIG. 7 is an explanatory diagram showing the third embodiment of the waste water pump according to the present invention.
Fig. 8 is an explanatory diagram showing a modified example of the structure of a wastewater pump having a tubular socket protruding into the pump chamber portion;
The figure shows a fourth modification of the wastewater pump according to the present invention, and is an explanatory drawing showing a wastewater pump having a structure in which a tubular socket protrudes inward and outward from the pump chamber.

Claims (1)

[Scope of Claims] 1. Comprising a motor and a pump connected to the motor, the assembled structure of the motor and the pump is immersible in wastewater, and the area of the suction opening or the pump is In a wastewater pump comprising a shredding device disposed in a suction opening for shredding suctioned contaminants, one member is stationary while the wastewater pump is in operation, and the other member is rotated by the motor; two mutually cooperating members are provided in the region of the suction opening, thereby periodically opening and closing the opening for the passage of the contaminants, said two members forming a shredding device, and The stationary member is a tube having an end shape for the chopping, and the rotating member is a jig in the tube having a side shape for the chopping. A wastewater pump characterized in that it cooperates with said end shape to periodically open and close an opening and shred and retain or discharge said contaminants. 2. The pump according to claim 1, wherein the two members are used to generate a pulsating suction flow. 3. A pump according to claim 1 or 2, wherein the side profile is in the form of a cutting edge or cutting fin that reaches the inner surface of the tube in the region of the rotating member. 4. A pump according to any one of claims 1, 2 or 3, wherein one or each of the end shapes is wavy in the unfolded state. 5. Claims 1 and 2, wherein one or each of the end shapes has a sawtooth shape in the unfolded state.
The pump according to any one of paragraphs 1 and 3. 6. The pump according to any one of claims 1, 2, 3, 4, or 5, wherein the side surface shape is wavy in the unfolded state. 7. The pump according to any one of claims 1, 2, 3, 4, or 5, wherein the side surface shape is a sawtooth shape in an expanded state. 8. Claim 1, wherein one or each of said side features has a sawtooth or undulation that corresponds generally in width to the undulation of one or each of said end features. 8. The pump according to any one of items 7 to 7. 9. According to any one of claims 1 to 8, one or each of the end shapes has a number of corrugations or sawtooths different from the number of corrugations or sawtooths of the side shape. Pump as described. 10. The pump of claim 9, wherein the number of corrugations or serrations on the side profile is greater than the number of undulations or serrations on the end profile of the tube. 11 The number of corrugations or serrations on the side profile is approximately 3:
11. The pump of claim 10 having a ratio of 2 to about 5:3. 12. Claims 1 to 11, in which the tube has at least a conical surface for cooperating with a rotating member, and the distance between the rotating member and the stationary member is mutually variable. Pump according to any one of paragraphs. 13. A pump according to claim 12, wherein at least one of the two members is displaceable towards the other of the members under the influence of a spring force. 14. A pump according to claim 12 or 13, wherein the conical surface of the tube tapers outward from the housing. 15. A pump according to claim 12 or 13, wherein the conical surface of the tube projects outwardly from the housing. 16. A pump according to any one of claims 1 to 15, wherein the tube projects outwardly from the suction opening of the housing. 17. A pump according to any one of claims 1 to 16, wherein the tube projects from the suction opening of the housing into the housing. 18. Claim 17, wherein the tube projects towards the free space between the boss and the inner edge of the impeller blade.
Pumps listed in section. 19. According to any one of claims 1 to 18, the impeller includes an impeller with a boss, and the rotary member is formed over at least a part of the length of the boss. pump. 20. A pump according to claim 18 or 19, wherein the tube projects in both directions, one outwardly from the housing and one into the housing. 21. A pump according to claim 20, wherein the tube has an end shape on both ends thereof. 22. A pump according to any one of claims 12 and 13 to 21, wherein the conical shape of the tube can vary over its length. 23. A pump according to any one of claims 1 to 22, wherein the rotating member is manufactured from at least two parts. 24. A pump according to any one of claims 1 to 23, wherein the end shape of the tube extends from one end of the tube over substantially the entire length of the tube.