Pump equipment

Abstract

To improve self-priming performance.SOLUTION: A pump device 100 comprises a casing cover 14, a guide vane 13 arranged opposite to the casing cover, and a casing 11 incorporating the casing cover and the guide vane. The guide vane comprises a plurality of discharge opening parts 13a in a surface SU1 opposite to an inner wall 14a of the casing cover, and discharges a fluid (air-water mixture 32) toward the inner wall of the casing cover from the plurality of discharge opening parts to make it collide against the inner wall of the casing cover.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a pump device.

Background Art

[0002] As a conventional pump device, there is one described in Patent Document 1. The conventional pump device described in Patent Document 1 is configured as a self-priming centrifugal pump with a jet pump connected to the suction side. This type of pump device supplies a part of the pressurized water discharged from the centrifugal pump to the jet pump during operation. Further, when this type of pump device is used for a shallow well, by connecting a jet pump having a check valve to the suction side of the centrifugal pump (that is, the suction side of the pump device), the pressurized water is effectively pressurized. This type of pump device is said to be able to obtain stable self-priming performance and surely perform pumping even when air is mixed into the suction pipe at the initial installation or due to waterlogging.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional pump device described in Patent Document 1, the discharge opening of the guide vane is provided on the circumferential side surface, and the fluid (gas-liquid mixture) discharged from the discharge opening easily flows in a certain direction as a swirling flow inside the casing. Therefore, the fluid (gas-liquid mixture) cannot be sufficiently decelerated inside the casing, and gas-liquid separation may not be sufficiently performed. As a result, the self-priming performance deteriorates, and it has been desired to improve the self-priming performance.

[0005] An object of the present invention is to provide a pump device with improved self-priming performance.

Means for Solving the Problem

[0006] To achieve the above object, the present invention provides a pump device, comprising a casing cover, a guide vane disposed opposite to the casing cover, and a casing incorporating the casing cover and the guide vane. On the inner wall of the casing cover, a plurality of concave spaces are provided, The guide vane has a plurality of discharge openings on the opposing surface to the inner wall of the casing cover and at the same time, the plurality of discharge openings have a flow rectifying plate presenting an L-shaped protrusion shape in a front view, and discharges fluid from the plurality of discharge openings toward the inner wall of the casing cover and the discharged fluid is to collide with the inner wall of the casing cover guided by the flow rectifying plate toward the concave space provided in in such a configuration. Other means will be described later.

Advantages of the Invention

[0007] According to the present invention, the self-priming performance can be improved.

Brief Description of the Drawings

[0008]

Figure 1

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Figure 11

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention (hereinafter referred to as "the present embodiments") will be described in detail with reference to the drawings. Note that each drawing only schematically shows the present invention to such an extent that it can be sufficiently understood. Therefore, the present invention is not limited to only the illustrated examples. Also, in each drawing, common components and similar components are denoted by the same reference numerals, and redundant descriptions thereof are omitted.

[0010] <Overall Configuration of Pump Device> Hereinafter, with reference to FIGS. 1 to 4, the overall configuration of the pump device 100 according to the present embodiment will be described. In the present embodiment, the pump device 100 will be described as a self-priming pump device in which a jet pump can be connected to the suction side. FIG. 1 is an internal configuration diagram of the pump device 100 according to the present embodiment. FIG. 2 is a perspective view of the pump device 100 with the outer casing cover 4 removed. FIG. 3 is a perspective view of the pump device 100 with the outer casing cover 4 removed and the jet pump 70 directly connected to the suction side. FIG. 4 is a side cross-sectional view of the pump device 100 with the jet pump 70 directly connected to the suction side.

[0011] As shown in FIG. 1, the pump device 100 according to the present embodiment includes an air pressure tank 1, a pump drive motor 2 disposed beside the air pressure tank 1, a control board 3 equipped with a speed control device for changing the rotational speed of the pump drive motor 2, and an outer casing cover 4 that covers them.

[0012] The shaft 2a of the motor 2 for driving the pump is inserted into the casing 11, and an impeller 12 is screwed to the tip thereof. The casing 11 has a hollow shape. The hollow internal space of the casing 11 functions as a volute chamber for flowing a fluid. A guide vane 13 is attached to the outer periphery of the impeller 12. The guide vane 13 is disposed inside the casing 11 and fixed to the casing 11 with a screw or the like.

[0013] A casing cover 14 is attached to the front surface of the casing 11, and the pump device 100 is configured to cover the casing 11 with the casing cover 14. With such a configuration, the casing cover 14 and the guide vane 13 are disposed opposite to each other. The guide vane 13 has a plurality of discharge openings 13a (see FIGS. 5 to 7) on the facing surface SU1 with the inner wall 14a of the casing cover 14. Details of the discharge openings 13a (see FIGS. 5 to 7) will be described later.

[0014] A suction flange 15 serving as a suction port for pumping water is attached to the casing cover 14. A flange packing (not shown) is attached between the casing 11 and the suction flange 15 to seal the space between the casing 11 and the suction flange 15 with water.

[0015] As shown in FIG. 2, a pressure flange 16 for returning a part of the pumped water whose pressure is increased by the impeller 12 and the guide vane 13 to the suction side (the jet pump 70 side) is attached to the suction flange 15.

[0016] A screw-in priming water supply plug 17 is provided at the upper part of the casing 11. At the initial installation of the pump device 100, this priming water supply plug 17 is removed and priming water is poured in.

[0017] When the pump device 100 is powered on and the pump drive motor 2 is driven, it pumps water and sends out the water pumped from the discharge pipe (not shown) to the outside through the discharge flange 5. Further, when the external flow path connected to the discharge pipe (not shown) is closed, the pressure on the downstream side of the discharge pipe (not shown) increases. Therefore, the pressure sensor 6 (see FIG. 1) operates to stop the pump drive motor 2.

[0018] When the pump device 100 is used in a shallow well, a jet pump 70 (see FIG. 3) is connected to the suction side. FIG. 3 shows the configuration of the pump device 100 with the jet pump 70 directly connected to the suction side. When the jet pump 70 is directly connected to the suction side of the pump device 100, the above-described suction flange 15 (see FIG. 2) and pressure flange 16 (see FIG. 2) are removed from the pump device 100. The jet pump 70 includes a jet body 71 which is the main body. A connection portion 72 for connecting a suction pipe (not shown) is attached to the jet body 71, and a check valve 73 for preventing the backflow of the water pumped up when the pump stops is attached to the connection portion 72.

[0019] As shown in FIG. 4, inside the casing cover 14, a flow path for flowing the pressurized water 74 supplied to the jet pump 70 (see FIG. 3) is formed. The arrows shown in FIG. 4 indicate the flow direction of the pressurized water 74 and the like. The casing cover 14 includes a nozzle 76 and a venturi 77 in the middle of the flow path, and has a drawing-in path for drawing in the water on the water source portion 78 side and guiding it to the flow path in the vicinity of the nozzle 76. The pressurized water 74 is ejected at high speed as a jet of water from the nozzle 76 toward the venturi 77. At this time, since the pressure around the nozzle 76 decreases, the water on the water source portion 78 side is also drawn into (sucked up) the venturi 77 together. As a result, the pressurized 75a is sent out from the inside of the casing cover 14 to the outside.

[0020] <Configuration of the Casing and Guide Vanes> Hereinafter, with reference to FIGS. 5 to 7, the configurations of the casing 11 and the guide vane 13 will be described. FIG. 5 is a perspective view of the casing 11 of the pump device 100 with the casing cover 14 removed, showing the inside of the casing 11. FIG. 6 is a perspective view of the guide vane 13 of the pump device 100 as viewed from the casing cover 14 side (front side). FIG. 7 is a perspective view of the guide vane 13 of the pump device 100 as viewed from the casing 11 side (rear side).

[0021] As shown in FIG. 5, in the internal space of the casing 11, a rotatable impeller 12 and a guide vane 13 for protecting the impeller 12 are arranged. Also, at a relatively high position in the internal space of the casing 11, a casing discharge port 11a through which air is discharged is provided.

[0022] As shown in FIGS. 5 to 7, in the guide vane 13, a plurality of discharge openings 13a are provided on the facing surface SU1 with the inner wall 14a of the casing cover 14. That is, the guide vane 13 has a configuration in which the facing surface SU1 is open and the circumferential side surface SU2 (see FIG. 7) is not open. Therefore, the pump device 100 has a structure in which the discharge openings 13a of the guide vane 13 face the casing cover 14 side. Note that the discharge opening 13a is an opening provided for discharging a fluid (air-water mixture 32 (see FIG. 5)) in which the air on the suction side sucked up by the rotation of the impeller 12 (see FIGS. 1 and 5) and the water in the casing 11 are mixed into the space between the casing 11 and the casing cover 14.

[0023] Also, in the guide vane 13, a flow rectifying plate 13b is formed at each discharge opening 13a. The flow rectifying plate 13b has an L-shaped protrusion shape when viewed from the front, and is structured to easily guide the fluid (air-water mixture 32 (see FIG. 5)) in the front direction (that is, the direction of the inner wall 14a of the casing cover 14).

[0024] Since the discharge opening 13a of the guide vane 13 of the pump device 100 is structured to face the casing cover 14 side, the fluid (gas-liquid mixture 32 (see FIG. 5)) discharged from the discharge opening 13a of the guide vane 13 collides with the inner wall 14a of the casing cover 14. As a result, the pump device 100 can disperse the flow of the fluid (gas-liquid mixture 32) (that is, make the flow of the fluid (gas-liquid mixture 32) turbulent so as not to flow in a certain direction as a swirling flow). Consequently, the pump device 100 can sufficiently decelerate the velocity of the fluid (gas-liquid mixture 32) within the casing 11. Also, by making the fluid (gas-liquid mixture 32) collide with the inner wall 14a of the casing cover 14, the surface tension of the air bubbles in the fluid (gas-liquid mixture 32) can be broken. Thereby, gas-liquid separation can be activated and the self-priming performance can be improved.

[0025] <Configuration of the Casing Cover> Hereinafter, with reference to FIG. 8, the configuration on the inner wall 14a side of the casing cover 14 will be described. FIG. 8 is a cross-sectional perspective view of the casing cover 14 of the pump device 100 as viewed from the casing 11 side.

[0026] As shown in FIG. 8, the casing cover 14 is provided with a suction port 79 through which the fluid (gas-liquid mixture 32) is sucked at a position facing the shaft 2a of the pump driving motor 2 (see FIG. 1). Also, the casing cover 14 has a plurality of reinforcing ribs 14b on the inner wall 14a for reinforcing the strength of the casing cover 14. The plurality of reinforcing ribs 14b are arranged in a lattice pattern and form a plurality of concave spaces 14c on the inner wall 14a of the casing cover 14.

[0027] <Self-Priming Action of the Pump Device> Here, with reference to FIGS. 1 to 8, the self-priming action of the pump device 100 will be described. At the initial stage of pump installation, the operator removes the priming water supply tap 17 (see FIG. 2) from the pump device 100 and injects priming water into the casing 11. After that, the operator attaches the priming water supply tap 17 (see FIG. 2) to the pump device 100, turns on the power, and drives the pump driving motor 2 (see FIG. 1). Then, the pump device 100 starts self-priming by rotating the impeller 12 and sucking up the air on the suction side and the priming water in the casing 11. At this time, a fluid (air-water mixture 32 (see FIG. 8)) in which the air on the suction side sucked up by the rotation of the impeller 12 and the priming water in the casing 11 are mixed is generated. As shown in FIG. 8, the pump device 100 discharges the fluid (air-water mixture 32) in which air and priming water are mixed from the discharge opening 13a of the guide vane 13 toward the inner wall 14a of the casing cover 14. The discharged fluid (air-water mixture 32) collides with the inner wall 14a of the casing cover 14 and decelerates, thereby promoting air-water separation. The air separated by the air-water separation is exhausted from the casing discharge port 11a to the outside of the pump device 100. Also, a part of the water for which the air-water separation is not completed is returned to the lower part of the casing 11 and becomes the pressurized water 74 (see FIG. 4) supplied to the jet pump 70 (see FIG. 3) through the pressure port 75 (see FIG. 4) of the casing cover 14, and is used for the self-priming action.

[0028] <Action and effect of the guide vane> Here, the action and effect of the guide vane 13 of the pump device 100 of the present embodiment will be described in comparison with the guide vane 53 of the pump device 100com of the comparative example shown in FIGS. 9 to 11. The pump device 100com of the comparative example shown in FIGS. 9 to 11 is a device corresponding to a conventional pump device. FIG. 9 is a perspective view of the pump device 100com of the comparative example with the casing cover 14 removed. FIG. 10 is a perspective view of the guide vane 53 of the pump device 100com of the comparative example as viewed from the side of the casing cover 14. FIG. 11 is a perspective view of the guide vane 53 of the pump device 100com of the comparative example as viewed from the side of the casing 11.

[0029] As shown in FIGS. 9 to 11, the pump device 100com of the comparative example is different from the pump device 100 of the present embodiment in that it includes a guide vane 53 instead of the guide vane 13 (see FIGS. 5 to 7).

[0030] The guide vane 53 (see FIGS. 9 to 11) of the pump device 100com of the comparative example is different from the guide vane 13 (see FIGS. 5 to 7) of the pump device 100 of the present embodiment in that the opposing surface SU1 of the comparative example is not open (a plurality of discharge openings 13a are not provided on the opposing surface SU1), and a plurality of discharge openings 53a are provided on the circumferential side surface SU2 (see FIG. 11). That is, in the pump device 100com of the comparative example, the discharge openings 53a of the guide vane 53 are not structured to face the casing cover 14 side.

[0031] In such a pump device 100com of the comparative example, the fluid (gas-water mixture 32) discharged from the discharge openings 53a of the guide vane 53 easily flows in a swirling flow in a certain direction within the casing 11. Therefore, in the pump device 100com of the comparative example, the fluid (gas-water mixture 32) discharged from the discharge openings 53a of the guide vane 53 cannot be sufficiently decelerated within the casing 11, and there is a possibility that gas-liquid separation cannot be sufficiently performed.

[0032] On the other hand, the guide vane 13 (see FIGS. 5 to 7) of the pump device 100 of the present embodiment has the circumferential side surface SU2 (see FIG. 7) not open, and a plurality of discharge openings 13a are provided on the opposing surface SU1. That is, in the pump device 100 of the present embodiment, the discharge openings 13a of the guide vane 13 are structured to face the casing cover 14 side.

[0033] In such a pump device 100 of the present embodiment, the fluid (gas-water mixture 32) discharged from the discharge opening 13a of the guide vane 13 collides with the inner wall 14a of the casing cover 14. As a result, the pump device 100 can disperse the flow of the fluid (gas-water mixture 32) (that is, make the flow of the fluid (gas-water mixture 32) turbulent so as not to flow in a certain direction as a swirling flow). As a result, the pump device 100 can sufficiently decelerate the velocity of the fluid (gas-water mixture 32) within the casing 11. Further, by causing the fluid (gas-water mixture 32) to collide with the inner wall 14a of the casing cover 14, the surface tension of the air bubbles in the fluid (gas-water mixture 32) can be broken. Thereby, the gas-liquid separation of air and water in the fluid (gas-water mixture 32) can be activated, and the self-priming performance can be improved.

[0034] In particular, the pump device 100 of the present embodiment is configured to discharge the fluid (gas-water mixture 32) from the discharge opening 13a of the guide vane 13 into a concave space 14c (see FIG. 8) provided in the inner wall 14a of the casing cover 14. In such a pump device 100 of the present embodiment, within the concave space 14c (see FIG. 8), the surface tension of the air bubbles in the fluid (gas-water mixture 32) can be broken. Further, the flow of the fluid (gas-water mixture 32) can be dispersed within the concave space 14c, and the velocity of the fluid (gas-water mixture 32) can be further greatly decelerated. Thereby, the self-priming performance can be further greatly improved.

[0035] Note that the pump device 100 of the present embodiment has a plurality of flow straightening plates 13b on the opposing surface SU1 of the guide vane 13. Such a pump device 100 of the present embodiment can guide the fluid (gas-liquid mixture 32) discharged from the discharge opening 13a of the guide vane 13 to the inner wall 14a of the casing cover 14 (specifically, the concave space 14c provided on the inner wall 14a (see FIG. 8)) by means of the plurality of flow straightening plates 13b. In contrast, the pump device 100com of the comparative example does not have the flow straightening plates 13b. Such a pump device 100com of the comparative example cannot guide the fluid (gas-liquid mixture 32) to the inner wall 14a of the casing cover 14. In the present embodiment, although the plurality of flow straightening plates 13b are integrally formed with the guide vane 13, the flow straightening plates 13b may be configured separately from the guide vane 13, and the number thereof is not limited.

[0036] <Main features of the pump device> (1) As shown in FIG. 1, the pump device 100 according to the present embodiment includes a casing cover 14, a guide vane 13 disposed opposite to the casing cover 14, and a casing 11 that houses the casing cover 14 and the guide vane 13, and is a self-priming device to which a jet pump 70 (see FIG. 3) can be connected on the suction side. As shown in FIGS. 5 to 7, the guide vane 13 has a plurality of discharge openings 13a on the opposing surface SU1 with the inner wall 14a of the casing cover 14, and is configured to discharge the fluid (gas-liquid mixture 32 (see FIG. 5)) from the plurality of discharge openings 13a toward the inner wall 14a of the casing cover 14 and cause it to collide with the inner wall 14a of the casing cover 14.

[0037] The pump device 100 according to such an embodiment causes the fluid (gas-liquid mixture 32) discharged from the discharge opening 13a of the guide vane 13 to collide with the inner wall 14a of the casing cover 14. As a result, the pump device 100 according to this embodiment can disperse the flow of the fluid (gas-liquid mixture 32) (that is, make the flow of the fluid (gas-liquid mixture 32) turbulent so as not to flow in a certain direction as a swirling flow). As a result, the pump device 100 according to this embodiment can sufficiently decelerate the velocity of the fluid (gas-liquid mixture 32) within the casing 11. Further, by causing the fluid (gas-liquid mixture 32) to collide with the inner wall 14a of the casing cover 14, the surface tension of the air bubbles in the fluid (gas-liquid mixture 32) can be broken. Thereby, gas-liquid separation can be activated and self-priming performance can be improved.

[0038] (2) As shown in FIG. 8, a plurality of concave spaces 14c are provided on the inner wall 14a of the casing cover 14 of the pump device 100 according to this embodiment. The guide vane 13 is configured to discharge the fluid (gas-liquid mixture 32) from the plurality of discharge openings 13a toward the concave space 14c of the inner wall 14a of the casing cover 14.

[0039] The pump device 100 according to such an embodiment can break the surface tension of the air bubbles in the fluid (gas-liquid mixture 32) within the concave space 14c (see FIG. 8). Further, the flow of the fluid (gas-liquid mixture 32) can be dispersed within the concave space 14c, and the velocity of the fluid (gas-liquid mixture 32) can be further greatly decelerated. Thereby, the self-priming performance can be further greatly improved.

[0040] (3) As shown in FIG. 6, the guide vane 13 of the pump device 100 according to this embodiment has a rectifying plate 13b at the plurality of discharge openings 13a. The rectifying plate 13b preferably has an L-shaped protrusion shape in a front view.

[0041] Such a pump device 100 according to the present embodiment can efficiently guide the fluid (gas-liquid mixture 32) toward the front direction (that is, the inner wall 14a of the casing cover 14 (particularly, the concave space 14c provided in the inner wall 14a (see FIG. 8))) by the flow rectifying plate 13b. Therefore, the pump device 100 according to the present embodiment can break the surface tension of the air bubbles in the fluid (gas-liquid mixture 32) by causing the fluid (gas-liquid mixture 32) to collide with the inner wall 14a of the casing cover 14. In addition, the flow of the fluid (gas-liquid mixture 32) can be efficiently dispersed in the concave space 14c, and the speed of the fluid (gas-liquid mixture 32) can be further greatly reduced. Thereby, the self-priming performance can be further greatly improved.

[0042] As described above, according to the pump device 100 according to the present embodiment, the self-priming performance can be improved.

[0043] The present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Also, a part of the configuration of the embodiment can be replaced with another configuration, and another configuration can be added to the configuration of the embodiment. Also, for a part of each configuration, addition, deletion, or replacement with another configuration is possible.

[0044] For example, in the above-described embodiment, the present invention has been described by taking the pump device 100 with the air-type pressure tank 1 as an example, but the present invention can also be applied to a pump device with an accumulator-type pressure tank, as well as a so-called non-automatic pump without a pressure tank.

Description of Reference Numerals

[0045] 1 Air-type pressure tank 2 Pump drive motor 2a Shaft 3 Control board 4 Outer impeller cover 5 Discharge flange 6 Pressure sensor 11 Casing 11a Casing discharge port 12 Impeller 13 Guide vane 13a Discharge opening 13b Straightening plate 14 Casing cover 14a Inner wall 14b Reinforcing rib 14c Concave space 15 Suction flange 16 Pressure flange 17 Tap for make-up water supply 32 Gas-liquid mixture 53 Guide vane (comparative example) 53a Discharge opening (comparative example) 70 Jet pump 71 Jet body 72 Connection part 73 Check valve 74 Pressurized water 75 Pressure port 75a Pressurized water 76 Nozzle 77 Venturi 78 Water source part 79 Suction port 100 Pump device 100com Pump device (comparative example) SU1 Opposite surface SU2 Circumferential side surface

Claims

【Claim 1】 A pump device comprising a casing cover, a guide vane disposed opposite to the casing cover, and a casing incorporating the casing cover and the guide vane, wherein a plurality of concave spaces are provided on the inner wall of the casing cover; the guide vane has a plurality of discharge openings on the surface facing the inner wall of the casing cover, and has a flow rectifying plate presenting an L-shaped protrusion in a front view at the plurality of discharge openings, discharges fluid from the plurality of discharge openings toward the inner wall of the casing cover, and guides the discharged fluid toward the concave space provided on the inner wall of the casing cover by the flow rectifying plate to cause the fluid to collide with the concave space. ​

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