JP3943344B2 - Submersible motor pump and pump gate - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a submersible motor pump that transfers water by rotationally driving an impeller connected to a submersible motor, and a pump gate using the submersible motor pump.
[0002]
[Prior art]
Conventionally, for example, in a place where a tributary flows into the main river, a gate for opening and closing the tributary is installed on the tributary side. When the main river is flooded due to heavy rain or the like, the water in the main river is prevented from flowing back into the tributaries by closing the gate. On the other hand, the water that flows from the upstream of the tributary when the gate is closed is forcibly drained to the main river by the pump.
[0003]
Among these types of gates, there is a pump gate in which a drain pump is attached to the gate itself in order to save space. FIGS. 11A and 11B are diagrams showing this type of conventional pump gate. That is, the pump gate 80 shown in FIG. 11A has a structure in which a submersible motor pump 85 for drainage is attached to a surface on the upstream side of a gate 81 that opens and closes a water channel. The pump 85 is operated to drain the water accumulated on the upstream side to the downstream side. Reference numeral 89 denotes a flap valve (backflow prevention valve). However, the pump gate 80 has a poor weight balance because the submersible motor pump 85 protrudes in front of the gate 81. Further, the thickness of the entire pump gate 80 including the submersible motor pump 85 cannot be reduced.
[0004]
On the other hand, the pump gate 80-2 shown in FIG. 11 (b) has the submersible motor pump 85 installed horizontally in the gate 81, and the water on the upstream side sucked from the water inlet 87 on the upstream side of the submersible motor pump 85. It is comprised so that it may drain from the flap valve 89 attached to the downstream end part of 85 to the downstream. In the case of this pump gate 80-2, since the submersible motor pump 85 is incorporated in the gate 81, the weight balance is worse than that of the pump gate 80 of FIG.
[0005]
That is, in the case of the pump gate 80-2 shown in FIG. 11B, since the submersible motor pump 85 and the flap valve 89 are attached in series, the length of this portion is long and the thickness cannot be reduced.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described points, and an object of the present invention is to use a submersible motor pump that can be thinned and can have a good weight balance such as a pump gate to which it is attached, and the submersible motor pump. To provide a pump gate.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention relates to a submersible motor pump that transfers water by rotationally driving an impeller connected to a submersible motor, and the water transferred around the submersible motor by the rotational drive of the impeller. And a reverse flow prevention mechanism is attached to a portion of the discharge passage around the speed reducer connected between the submersible motor or the submersible motor and the impeller.
[0008]
Further, the present invention is characterized in that the backflow prevention mechanism is configured such that a plate-like valve body is attached so as to open in the drain direction but close in the backflow direction. The valve body may be configured by a single plate that blocks the discharge flow path, or may be configured in a shape divided into a plurality of sheets.
[0011]
Further, the present invention is characterized in that the submersible motor pump is used as the submersible motor pump in a pump gate in which a submersible motor pump is incorporated in a gate that opens and closes a water channel.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic sectional side view showing a pump gate 1 to which a submersible motor pump 10 according to an embodiment of the present invention is attached. As shown in the figure, this pump gate 1 is a state in which the submersible motor pump 10 for drainage is incorporated in a horizontally placed state (motor shaft is in a horizontal state) in a gate 2 that opens and closes the water channel 60, and the water channel 60 is closed by the gate 2. Then, the water on the upstream side 61 of the closed water channel 60 is drained to the downstream side 63 by driving the submersible motor pump 10.
[0013]
Here, the submersible motor pump 10 is provided with a discharge passage 13 for draining the water on the upstream side 61 of the closed water passage around the submersible motor 20 to the downstream side 63, and the discharge passage 13 is provided in a portion around the submersible motor 20. A backflow prevention mechanism 40 that opens and closes is attached.
[0014]
FIG. 2 is an enlarged cross-sectional view showing a main part of the submersible motor pump 10 in an enlarged manner, and is a view of the submersible motor pump 10 shown in FIG. As shown in the figure, the submersible motor pump 10 includes a substantially cylindrical casing 11 that forms a discharge flow path 13. A submersible motor 20 is installed at the center of the discharge flow path 13. An impeller 23 is attached to a shaft 21 protruding from one end. The submersible motor 20 is supported by guide vanes 25. The backflow prevention mechanism 40 opens the valve bodies 41 and 43 that open and close the discharge flow path 13 around the submersible motor 20 by the hinges 45 and 47 attached to the valve bodies 41 and 43 in the drain direction, but the backflow direction. Is configured to be closed.
[0015]
FIG. 3 is a front view of the backflow prevention mechanism 40 as viewed from the right side of FIG. As shown in the figure, the two valve bodies 41 and 43 are formed by bifurcating a donut-shaped disk into left and right symmetrical shapes, and the outer peripheries of the valve bodies 41 and 43 can be opened and closed by hinges 45 and 47, respectively. Thus, both valve bodies 41 and 43 can be opened in double-speech. In the case of this embodiment, a resilient means for resiliently closing the valve elements 41 and 43, specifically a coil spring (not shown), is attached to the hinges 45 and 47. The elastic means may be constituted by elastic means other than a coil spring such as a leaf spring, and is not necessarily attached to the hinges 45 and 47, and may be attached to the valve bodies 41 and 43. .
[0016]
FIG. 4 is a front view of the valve seat member 27 as viewed from the right side of FIG. As shown in the figure, the valve seat member 27 has a shape that abuts against the entire outer periphery of both valve bodies 41 and 43 shown in FIG. 3, that is, an inner ring portion 271 and an outer ring portion 273, and two connecting portions 275. , 277 are connected to each other. The valve seat member 27 is made of, for example, a metal plate, or an elastic plate made of rubber or the like is attached to the surface of the metal plate on which the valve elements 41 and 43 abut. In addition, you may attach an elastic board to the part which the valve seat member 27 of the valve bodies 41 and 43 contacts.
[0017]
Next, the operation of the pump gate 1 will be described. FIG. 5 is a schematic view showing an example of use of the pump gate 1. As shown in the figure, in this example, the pump gate 1 is installed in the tributary 90 and the sluice 95 is installed downstream thereof. This tributary 90 is connected to the main river 100. For example, when the main river 100 increases due to heavy rain or the like, the water in the main river 100 is prevented from flowing back to the tributaries 90 by closing the pump gate 1. On the other hand, the water flowing from the upstream of the tributary 90 when the pump gate 1 is closed drives the underwater motor 20 to rotate the impeller 23 shown in FIG. Forcibly drain the water. At that time, the valve bodies 41 and 43 are opened to the dotted line position shown in FIG. 2 against the resilient means attached to the hinges 45 and 47. On the other hand, when drainage is no longer necessary, if the driving of the submersible motor 20 is stopped, the valve elements 41 and 43 close the discharge flow path 13 by the resilient means attached to the hinges 45 and 47, so that backflow of water is prevented. The The sluice 95 is used to reliably prevent the reverse flow of water in the water channel by closing the water gate 95 when any trouble occurs in closing the water channel by the pump gate 1.
[0018]
6 is a front view showing a backflow prevention mechanism 40-2 according to another embodiment of the present invention, and is a view seen from the same direction as the backflow prevention mechanism 40 shown in FIG. The two valve bodies 41-2 and 43-2 shown in the figure are configured by dividing a donut-shaped disk into two vertically and each valve body 41-2 and 43-2 is a hinge 45-2. , 47-2 so as to be freely opened and closed. In the case of this embodiment, the hinges 45-2 and 47-2 are attached to the upper portions of the outer peripheries of the respective valve bodies 41-2 and 43-2, and the discharge flow is caused by the weight of the valve bodies 41-2 and 43-2. The path 13 is configured to be closed, and by configuring in this way, it is not necessary to attach a resilient means to the hinges 45-2 and 47-2.
[0019]
FIG. 7 is an enlarged side sectional view of a main part of a submersible motor pump 10-3 according to still another embodiment of the present invention. FIG. 8 is a front view of the backflow prevention mechanism 40-3 as viewed from the right side of FIG. FIG. 9 is a front view of the valve seat member 27-3 as viewed from the right side of FIG. In this embodiment, the difference from the submersible motor pump 10 shown in FIGS. 2 to 4 is that only one substantially C-shaped valve body 41-3 is used as the valve body. In this embodiment, the hinge 45-3 is attached to the upper part of the valve body 41-3, and the discharge flow path 13-3 is closed by the dead weight of the valve body 41-3. The shape of the valve seat member 27-3 is also formed in a shape that matches the shape of the valve body 41-3 and the submersible motor 20-3 as shown in FIG. With this configuration, only one valve body 41-3 is required, and the number of parts can be reduced.
[0020]
By the way, the submersible motor pump 10 can be used for various purposes other than the pump gate 1. FIG. 10 is a plan view showing a fixed gate 70 using the submersible motor pump 10 according to the present invention. In the figure, a gate 70 is configured by attaching a flap gate 75 to a partition wall 73 provided in a water channel 71. A submersible motor pump 10 similar to that shown in FIG. 2 is attached to the partition wall 73. Normally, water flows while pushing the flap gate 75 from the upstream side toward the downstream side, but when the water level on the downstream side becomes higher, the flap gate 75 is closed and forced by driving the submersible motor pump 10. The upstream water is drained downstream.
[0021]
In addition, it cannot be overemphasized that the submersible motor pump 10 concerning this invention can be utilized for other various uses. In short, it can be used at any location where a conventional submersible motor pump has been used.
[0022]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. For example, in the above-described embodiment, the backflow prevention mechanism 40 is attached to a portion around the submersible motor 20, but when a reducer is connected between the submersible motor 20 and the impeller 23, a portion around the reducer is used. You may attach to. Moreover, although the example which divided the valve body into two pieces or one piece was shown in the said embodiment, you may divide | segment into three or more pieces. Moreover, although the example which drains from the upstream of a gate to the downstream was shown in the said embodiment, the point should just drain the water of the one side of a water channel to the other side, and depending on a use, it may be upstream from a downstream. You may comprise so that it may drain to the side. The valve body opening / closing means constituting the backflow prevention mechanism is not limited to the hinge, and other various opening / closing means may be used.
[0023]
【The invention's effect】
As described in detail above, the present invention has the following excellent effects.
(1) Since the backflow prevention mechanism is attached to the part of the discharge flow path around the motor or speed reducer of the submersible motor pump, the length of the submersible motor pump including the backflow prevention mechanism can be reduced. Therefore, the thickness of the pump gate to which the submersible motor pump is mounted, the fixed gate and other various mounted members are not increased by the backflow prevention mechanism, and the thickness can be reduced, and the weight balance of the pump gate and the like is good. Become.
[0024]
{Circle around (2)} Since the backflow prevention mechanism is constructed so that the plate-like valve element is opened in the direction of drainage but closed in the direction of backflow, the structure is simple and the manufacture is easy.
[Brief description of the drawings]
FIG. 1 is a schematic sectional side view showing a pump gate 1 to which a submersible motor pump 10 according to an embodiment of the present invention is attached.
FIG. 2 is an enlarged cross-sectional view showing a main part of the submersible motor pump 10 in an enlarged manner.
3 is a front view of the backflow prevention mechanism 40 as viewed from the right side of FIG.
4 is a front view of the valve seat member 27 as viewed from the right side of FIG. 2;
FIG. 5 is a schematic view showing an example of use of the pump gate 1;
FIG. 6 is a front view showing a backflow prevention mechanism 40-2 according to another embodiment of the present invention.
FIG. 7 is an enlarged side cross-sectional view of a main part showing an enlarged portion of the submersible motor pump 10-3.
8 is a front view of the backflow prevention mechanism 40-3 as viewed from the right side of FIG.
9 is a front view of the valve seat member 27-3 as viewed from the right side of FIG.
FIG. 10 is a plan view showing a fixed gate 70 using the submersible motor pump 10 according to the present invention.
FIG. 11 is a diagram showing a conventional pump gate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pump gate 2 Gate 10 Submersible motor pump 11 Casing 13 Discharge flow path 20 Submersible motor (motor)
21 Shaft 23 Impeller 25 Guide vane 27 Valve seat member 40 Backflow prevention mechanism 41, 43 Valve body 45, 47 Hinge 60 Water channel 90 Branch river 95 Sluice 100 Main river 40-2 Backflow prevention mechanism 41-2, 43-2 Valve body 45 -2, 47-2 Hinge 10-3 Submersible motor pump 20-3 Submersible motor (motor)
40-3 Backflow prevention mechanism 41-3 Valve body 45-3 Hinge

Claims (3)

In a submersible motor pump that transfers water by rotationally driving an impeller coupled to a submersible motor,
A portion of the discharge passage around the submersible motor is provided around the submersible motor, and is provided with a discharge passage for water transferred by the rotational drive of the impeller and connected between the submersible motor or the submersible motor and the impeller. A submersible motor pump, which is equipped with a backflow prevention mechanism.   2. The submersible motor pump according to claim 1, wherein the backflow prevention mechanism is configured such that a plate-like valve body is attached so as to open in a draining direction but close in a backflow direction. In pump gates that incorporate submersible motor pumps in gates that open and close water channels,
3. A pump gate using the submersible motor pump according to claim 1 or 2 as the submersible motor pump.

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