JP7650496B2 - Pumping device and jet pipe - Google Patents

Description

The present invention relates to a pump device that supplies a fluid to a secondary side and a jet tube that is provided on the primary side of the pump device.

Generally, pump devices that supply water or the like to the secondary side are known. In addition, technology is known for such pump devices that uses a baffle on the primary side of the impeller (see, for example, Patent Document 1 and Patent Document 2). Such baffles are often used in the suction side flow passage of the casing on the primary side of the impeller. Baffles are used to eliminate surging by suppressing swirling flow and to eliminate cavitation by reducing flow velocity.

JP 2005-146981 A JP 2005-330878 A

Conventional technology does not pose a problem when the flow rate on the primary side of the pump is low, such as during suction operation, but when the primary pressure is high, swirling flow and cavitation are unlikely to occur, and they can act as an obstacle (baffle plate), causing losses and leading to noise and reduced performance. This also applies to structures such as jet pump nozzles and diffusers, where the fluid that has been pressurized by the pump impeller passes through at a high flow rate.

SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a pump device and a jet pipe capable of reducing losses even when the flow velocity is high.

According to one aspect of the present invention, a pump device includes a rear shroud, a front shroud that faces the rear shroud, an impeller having a plurality of blades that is provided between the rear shroud and the front shroud , a casing that houses the impeller, and a straightening member that is provided within an intake port of the casing and has the same number of straightening plates as the number of blades of the impeller, and the intake port has a diameter equal to or slightly larger than the diameter of the mouth of the impeller. the blades extend from the opposing surfaces of the rear shroud and the front shroud along the axial direction of the impeller and are curved in a direction perpendicular to the axial direction, the straightening vane is plate-shaped and extends radially from the inner surface of the suction port and linearly along the axial direction, with the main surface direction aligned with the axial direction of the suction port, the straightening vane is formed integrally with the inner surface of the suction port, and the inner surface of the suction port is inclined toward the center towards the impeller.

According to one aspect of the present invention, a jet pipe comprises a suction pipe connected to a casing that houses an impeller, a pressure pipe through which a portion of the water flowing in from the suction pipe and pressurized flows, a junction pipe having an opening that merges with the suction pipe and the pressure pipe at an upper end and opens to a water supply source, a suction passage section that connects the suction pipe from the opening, a junction passage section that connects the suction passage section midway through and to the pressure pipe, a diffuser held in the suction passage section, and a nozzle arranged on the primary side of the diffuser in the suction passage section, the nozzle having baffles on its inner surface in the same number as the blades of the impeller.

SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a pump device and a jet pipe capable of reducing loss even when the flow velocity is high.

1 is a side view, partially in cross section, showing a configuration of a pump device according to a first embodiment of the present invention; 2 is a side view showing the configuration of the pump device, with a part in cross section, of a casing used in the pump device; FIG. FIG. 2 is a plan view showing the configuration of an impeller of the pump device. FIG. 6 is a side view showing a configuration of a pump device according to a second embodiment of the present invention, partially in cross section, with some of the configuration omitted. FIG. 2 is a side view of the pump device, showing a casing in partial cross section and with some of the configuration omitted. FIG. 11 is a side view of a pump device according to a third embodiment of the present invention, showing a casing in partial cross section and with some of the configuration omitted. FIG. 13 is a side view of a pump device according to a fourth embodiment of the present invention, showing a casing in partial cross section and with some of the configuration omitted. FIG. 4 is a side view showing the configuration of the impeller of the pump device. 13A to 13C are cross-sectional views showing the configurations of first and second examples of a straightening plate of a straightening member according to a fifth embodiment. FIG. 13 is a side view showing the configuration of a flow guide member according to a sixth embodiment. FIG. 4 is a cross-sectional view showing, with some parts omitted, the configuration of a pump device using the flow straightening member. FIG. 13 is an explanatory diagram showing the configuration of a pump device according to a seventh embodiment, illustrating the configuration of a jet tube in cross section. FIG. 4 is a side view showing the configuration of a nozzle used in the jet tube. FIG. FIG. 4 is a side view showing the configuration of a diffuser used in the jet tube. FIG. FIG. 13 is a side view showing the configuration of a pump device according to an eighth embodiment, with some parts omitted and some parts in cross section. FIG. 13 is a cross-sectional view showing the configuration of a pump device according to a ninth embodiment, with some parts omitted.

Hereinafter, a flow guide member 14 and a pump device 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.
FIG. 1 is a side view showing the configuration of a pump device 1 according to a first embodiment of the present invention, with the configuration of a pump 13 shown in cross section; FIG. 2 is a side view showing the configuration of a casing 21 of a pump 13, with a partial cross section; and FIG. 3 is a side view showing the configuration of an impeller 22 of the pump 13, with a partial cross section.

The flow straightening member 14 used in the pump device 1 is provided on the primary side of the impeller 22 of the pump device 1, and straightens the flow in part of the flow path to the impeller 22 using flow straightening plates 31, the same number as the blades 27 of the impeller 22.

An example of a pump device 1 according to the first embodiment will be described. The pump device 1 includes a motor 11, a rotating shaft 12, a pump 13, and a flow straightening member 14. The pump device 1 also includes, for example, a pressure sensor 15 that detects the discharge pressure of the pump 13, and a flow sensor 16 that detects the discharge flow rate of the pump 13.

The pump device 1 pumps water as a fluid using a pump 13. The pump device 1 may be either a horizontal axis pump or a vertical axis pump. The pump device 1 may be a single-stage pump having one impeller 22, or a multi-stage pump having multiple impellers 22. The pump device 1 may be a jet pump equipped with a jet pipe having a nozzle and a diffuser on the primary side. The pump device 1 shown in Figures 1 to 3 is an example of a horizontal axis pump in which a jet pipe is connected to the primary side in a single stage.

The motor 11 has, for example, a casing 11a, a stator, and a rotor. The motor 11 is, for example, connected to a control panel and is variable speed controlled by an inverter or the like. The motor 11 may be configured to rotate at a constant speed as a constant speed control.

The rotating shaft 12 is, for example, connected to the rotor of the motor 11, or connected via a shaft coupling to a motor shaft fixed to the rotor of the motor 11. The rotating shaft 12 can have an impeller 22 fixed thereto. The rotating shaft 12 rotates in conjunction with the driving of the motor 11, thereby rotating the fixed impeller 22.

The pump 13 includes a casing 21 and an impeller 22. The casing 21 houses the impeller 22. The casing 21 has an intake port 21a, a pump chamber 21b, and a discharge port 21c. The casing 21 also has a pressure pipe connection port 21d for connecting a pressure pipe of a jet pipe, for example. The casing 21 also has a guide vane 21e for housing the impeller 22, for example. The casing 21 may be configured without the guide vane 21e.

The suction port 21a is a cylindrical opening, and is formed so that piping or the like can be connected. The inner diameter of the suction port 21a is either the same diameter or gradually decreases from the primary side toward the secondary side, which is the impeller 22 side. For example, the inner diameter of the suction port 21a on at least the secondary side is formed to be the same diameter as the aperture diameter of the impeller 22 or slightly larger. In this embodiment, as shown in FIG. 1, an example is shown in which the suction port 21a decreases in diameter from the primary side toward the secondary side, and is formed to be the same diameter as the aperture diameter of the impeller 22 at the open end on the secondary side.

The impeller 22 has, for example, a rear shroud 25 fixed to the rotating shaft 12, a front shroud 26 facing the rear shroud 25 and having a mouth 26a that draws water inward, and a number of blades 27 provided between the rear shroud 25 and the front shroud 26.

The blades 27 are curved, for example, with a predetermined radius of curvature. As a specific example, the blades 27 extend from the opposing surfaces of the rear shroud 25 and the front shroud 26 along the axial direction of the impeller 22, and are curved in a direction perpendicular to the axial direction of the impeller 22. The curved shape of the blades 27 can be set appropriately depending on the required performance of the pump 13, etc.

The blades 27 are arranged at equal intervals in the circumferential direction, and the interval between adjacent blades 27 in the circumferential direction gradually increases from the center of the impeller 22 toward the radially outward direction. The blades 27 are set at a predetermined inlet angle at the mouth 26a of the front shroud 26. For example, six blades 27 are provided.

The flow straightening member 14 has a plurality of flow straightening plates 31 formed in a plate shape, and a tubular portion 32 with which the plurality of flow straightening plates 31 are integrally formed. The flow straightening member 14 is provided on the primary side of the impeller 22 in the flow path to the impeller 22 of the pump 13. The flow straightening member 14 may be provided integrally with the pump 13, or may be provided separately from the pump 13.

That is, the flow straightening member 14 may be configured to be integral with a part of the casing 21 of the pump 13, or may be configured to be separate from the casing 21 and fixed to be integral with the casing 21, or may be configured to be integral with a connecting member connected to the casing 21, or may be configured to be separate from the connecting member connected to the casing 21 and fixed to be integral with the casing 21.

Here, examples of the connection members connected to the casing 21 include piping, the suction pipe of the jet tube, a nozzle, a diffuser, etc. Furthermore, such connection members may be configured to be directly connected to the casing 21, or may be configured to be connected to the casing via piping, etc.

In this embodiment, the straightening member 14 is formed integrally with the casing 21, and is described as constituting a straightening structure together with the casing 21. Therefore, the suction port 21a constitutes the cylindrical portion 32 of the straightening member 14.

The baffle plate 31 is formed, for example, in a rectangular plate shape with the same plate thickness. The surface direction of the baffle plate 31 is along the axial direction of the suction port 21a or is inclined with respect to the axial direction and is provided on the inner peripheral surface of the suction port 21a, which is the cylindrical portion 32. The baffle plate 31 is provided in the same number as the vanes 27 of the impeller 22.

As a specific example, a plurality of straightening plates 31 are arranged on the inner peripheral surface of suction port 21a at equal intervals in the circumferential direction, with the main surface direction aligned along the longitudinal direction of suction port 21a. Also, for example, straightening plate 31 extends from the inner peripheral surface of suction port 21a along the radial direction of suction port 21a, and also extends along the axial direction of suction port 21a between one end side and the other end side in the axial direction of suction port 21a. That is, the end of straightening plate 31 on the center side of suction port 21a extends linearly along the axial direction of suction port 21a.

The straightening plate 31 is provided radially outward from the center of the suction port 21a (or the connecting member) where the straightening member 14 is provided, at a distance of 50% of the diameter of the suction port 21a. The 50% diameter is indicated by D in FIG. 2. In other words, the end of the straightening plate 31 on the center side of the suction port 21a is located at a position 1/4 or less of the diameter of the suction port 21a from the inner peripheral surface of the suction port 21a. Therefore, as in this embodiment, the straightening plate 31, whose main surface direction is aligned along the radial and axial directions of the suction port 21a, has a height from the inner peripheral surface of the suction port 21a set to 1/4 or less of the diameter of the suction port 21a.

The straightening plate 31 has chamfered portions 31a formed in a semicircular, curved or linear chamfered shape, for example, at least at the end of the primary side of the suction port 21a and at the corners at the end of the suction port 21a in the radial direction, preferably at the corners and corners that contact the flow channel of the straightening plate 31. In other words, the straightening plate 31 has chamfered portions 31a that are curved or flat, etc., that suppress obstruction of the flow of water at least at the water contact surface at the tip in the water flow direction that contacts the flow channel through which water flows, preferably at the water contact surface that is the end that contacts the flow channel.

With the pump device 1 configured in this manner, the flow of water sucked into the impeller 22 can be regulated by providing a number of straightening plates 31 as the straightening member (straightening structure) 14 on the inner peripheral surface of the suction port 21a, which is the cylindrical portion 32.

In other words, the straightening member 14 is configured to have the same number of straightening plates 31 as the blades 27 on the primary side of the impeller 22, which allows water to flow smoothly from the mouth 26a of the impeller 22 into the spaces between the adjacent blades 27. Therefore, the straightening member 14 can reduce loss and achieve quiet operation even when the water flow is fast.

In addition, the straightening member 14 positions these straightening plates 31 radially outward from 50% of the minimum flow diameter of the tubular portion 32 (suction port 21a) in which the straightening plates 31 are provided, thereby enabling water to flow more smoothly between adjacent blades 27 of the impeller 22.

In addition, the straightening vane 31 has a chamfered portion 31a, which allows the flow of water to be guided at the water contact surface of the straightening vane 31, thereby minimizing loss.

As described above, the flow straightening member 14 and pump device 1 according to the first embodiment of the present invention can reduce losses even when the flow velocity is high.

The present invention is not limited to the above-described embodiment. Other embodiments of the present invention will be described below. In the other embodiments described below, the same components as those in the above-described embodiment will be given the same reference numerals, and detailed descriptions thereof will be omitted. In addition, components such as the motor 11, pressure sensor 15, and flow rate sensor 16 will be omitted as appropriate in each figure.

For example, in the above example, the baffle plate 31 is positioned radially outward from 50% of the minimum flow diameter, and extends radially from the inner circumferential surface of the tube portion 32, but this is not limiting.

For example, as in the pump device 1 having the straightening member 14 according to the second embodiment shown in Figures 4 and 5, the suction port 21a, which is the cylindrical portion 32, may be gradually tapered in the flow direction from the primary side to the secondary side, and the radial tip of the straightening plate 31 may be set at a height that is the same as the minimum flow diameter of the suction port 21a.

The baffle plate 31 is not rectangular, but triangular, and is set to a shape that is inclined from the inner circumferential surface side of the suction port 21a. That is, the baffle plate 31 is inclined from the primary side toward the secondary side, with the radially outward side inclined toward the center of the suction port 21a.

Such a straightening member 14 according to the second embodiment has the same effect as the straightening member 14 according to the first embodiment described above. As shown in FIG. 5, the straightening plate 31 may be configured not to have chamfered portions 31a at the corners of the primary side and secondary side. Also, as shown in FIG. 5, the straightening plate 31 may be configured to have curved or flat chamfered portions 31a at the corners between both main surfaces and the tip surface in the radial direction.

In the above example, the straightening member 14 has a shape in which the plurality of straightening plates 31 extend along the axial direction, but is not limited to this. For example, as in the straightening member 14 of the pump device 1 according to the third embodiment shown in FIG. 6, the plurality of straightening plates 31 may be configured to have the same shape as the plurality of blades 27 of the impeller 22, i.e., a shape that has the same angle or an angle close to the inlet angle of the plurality of blades 27. The straightening plate 31 may be flat or curved like the impeller 22.

In other words, the plurality of straightening plates 31 are arranged to be inclined with respect to the radial direction of the tubular portion 32 (suction port 21a) of the blade 27 at the same angle as the inclination angle of the mouth 26a with respect to the radial direction of the impeller 22. The angle is, for example, the angle of the tangent of the blade 27. By forming the plurality of straightening plates 31 of the impeller 22 in this shape, the flow of water passing through the plurality of straightening plates 31 is similar to the flow of water sucked from the mouth 26a of the impeller 22, so that the water flows more smoothly into the impeller 22. As shown in FIG. 6, the straightening plate 31 may be configured so that the tip is curved without having chamfered portions 31a at the corners between both main surfaces and the tip surface in the radial direction.

In the above example, the blades 27 of the impeller 22 extend in the axial direction from the main surfaces of the rear shroud 25 and the front shroud 26, but the present invention is not limited to this. For example, the configurations of the pump 13 of the pump device 1 of the fourth embodiment are shown in Figs. 7 and 8. As shown in Fig. 8, the blades 27 may have a so-called three-dimensional structure in which some or all of them extend at an incline with respect to the axial direction. Note that in Fig. 8, the front shroud 26 is omitted and only the impeller 22 is shown. When the blades 27 have a three-dimensional structure as shown in Fig. 8, the multiple baffle plates 31 may have a shape that is inclined with respect to the radial and axial directions so as to have the same shape as the inlet angle of the blades 27, as shown in Fig. 7.

In the above example, the straightening plate 31 has the same thickness, but the present invention is not limited to this. For example, the straightening plate 31 may have a shape in which the thickness gradually changes from one side to the other side in the water flow direction. For example, FIG. 9 shows a cross-sectional view of the straightening plate 31 of the straightening member 14 according to the fifth embodiment. As shown in the first example of FIG. 9, the straightening plate 31 may be configured such that the thickness of the primary side in the water flow direction is smaller than the thickness of the secondary side, or as shown in the second example of FIG. 9, the straightening plate 31 may be configured such that the thickness of the primary side in the water flow direction is larger than the thickness of the secondary side.

For example, if the inner diameter of the suction port 21a is gradually reduced, the thickness of the baffle plate 31 can be appropriately set depending on the diameter of the suction port 21a and the diameter of the mouth 26a of the impeller 22, such as by configuring the width of the primary side in the water flow direction to be smaller than the width of the secondary side, as shown in the first example of Figure 9. Note that the baffle plate 31 may be configured so that the ends of the primary side and the secondary side are curved, as shown in Figure 9.

In the above example, the straightening member 14 is configured as a cylindrical portion 32 that serves as the suction port 21a of the casing 21, and has multiple straightening plates 31 on the inner peripheral surface of the suction port 21a, but is not limited to this.

For example, as shown in the sixth embodiment in Figs. 10 and 11, the tubular portion 32 may be a cylindrical member, and a plurality of straightening plates 31 may be provided on the inner peripheral surface of the tubular portion 32. The straightening member 14 may be configured such that the tubular portion 32 provided with the straightening plates 31 is fixed to the suction port 21a, or may be configured to be fixed to the guide vane 21e as shown in Fig. 11. With such a configuration, the straightening member 14 can be selectively attached to the casing 21. As shown in Figs. 10 and 11, the straightening plate 31 may not have a chamfered portion 31a.

In the above example, the straightening member 14 is disposed in the pump 13, but the present invention is not limited to this. In the above example, the pump device 1 may be a jet pump equipped with a jet tube on the primary side, but the straightening member 14 may be provided in at least one of the nozzle and diffuser used in the jet tube.

Specifically, an example of the pump device 1 according to the seventh embodiment and a connecting member provided on the pump device 1, that is, a jet tube 2 provided with a flow straightening member 14, will be described with reference to Figures 12 to 16. Note that since the pump device 1 to which the jet tube 2 is connected is the pump device 1 of each of the above-mentioned embodiments, a detailed description thereof will be omitted.

The pump device 1 includes a motor 11, a rotating shaft 12, a pump 13, and a jet tube 2. The pump 13 may have a straightening member 14 as in the above-described embodiments, or may not have a straightening member 14. The pump device 1, which is such a jet pump, also has a pressure-controlled valve.

The jet pipe 2 includes a suction pipe 41, a pressure pipe 42, a junction pipe 43, a check valve 44, a nozzle 45, and a diffuser 46. The jet pipe 2 includes a straightening member 14 in at least one of the nozzle 45 and the diffuser 46. In this embodiment, a configuration in which the straightening member 14 is included in both the nozzle 45 and the diffuser 46 will be described. For ease of explanation, the straightening member 14 provided in the nozzle 45 will be referred to as a nozzle straightening member 14A, and the straightening member 14 provided in the diffuser 46 will be referred to as a diffuser straightening member 14B.

The suction pipe 41 is connected to the suction port 21a of the pump 13. The pressure pipe 42 is connected to the pressure pipe connection port 21d of the pump 13.

The junction pipe 43 has an upper end connected to the suction pipe 41 and the pressure pipe 42. The junction pipe 43 has an opening 43a at its lower end that opens to the water supply source, and is equipped with a strainer 43b fixed to this opening 43a. The junction pipe 43 also has a suction passage section 43c that connects the opening 43a to the suction pipe 41, and a junction passage section 43d that connects the middle of this suction passage section 43c to the pressure pipe 42. The junction pipe 43 also holds a diffuser 46 in the suction passage section 43c on the secondary side (suction pipe 41 side) of the junction passage section 43d. The junction pipe 43 is also connected to the secondary side of the junction passage section 43d, and a nozzle 45 is arranged on the primary side of the diffuser 46 provided in the suction passage section 43c.

The check valve 44 prevents backflow of water from the primary side to the secondary side. The check valve 44 is located in the suction passage section 43c, which is closer to the primary side (the opening 43a side) than the junction passage section 43d of the junction pipe 43.

As shown in Figures 12 and 14, the nozzle 45 has an inner diameter that decreases from the end on the confluence flow passage section 43d side toward the tip. As shown in Figures 12 and 16, the diffuser 46 has the tip of the nozzle 45 disposed within the opening of the end on the primary side. The diffuser 46 decreases in diameter, for example, at one end on the primary side where the nozzle 45 is disposed, and then gradually increases in diameter from the decreased diameter portion toward the secondary side, which is the suction pipe 41 side.

As shown in Figures 12 to 14, the nozzle straightening member 14A has multiple straightening plates 31 formed in a plate shape. In addition, in the nozzle straightening member 14A, for example, the nozzle 45 constitutes the cylindrical portion 32. In other words, the nozzle 45 has multiple straightening plates 31 on its inner circumferential surface.

As shown in Figures 12, 15, and 16, the diffuser straightening member 14B has multiple straightening plates 31 formed in a plate shape. In the diffuser straightening member 14B, for example, the diffuser 46 constitutes the cylindrical portion 32. In other words, the diffuser 46 has multiple straightening plates 31 on its inner peripheral surface.

In a pump device 1 having such a jet pipe 2, the pump 13 draws in water from a water source such as a well through the junction pipe 43 and the suction pipe 41, and then returns a portion of the pressurized water from the pressure pipe connection port 21d through the pressure pipe 42 to the junction pipe 43, and discharges it from a nozzle 45 connected to the junction flow path section 43d of the junction pipe 43 toward the diffuser 46.

At this time, negative pressure is created around the nozzle 45 in the junction pipe 43, so that the water sucked in through the strainer 43b of the junction pipe 43 and flowing through the suction passage section 43c and the water flowing through the junction passage section 43d and discharged from the nozzle 45 join together on the primary side of the diffuser 46 and flow into the diffuser 46. The diffuser 46 converts the kinetic energy of the flowing water into pressure energy. The water that has flowed through the diffuser 46 then passes through the suction pipe 41 and is supplied to the impeller 22 from the suction port 21a of the pump 13.

In addition, the water passing through the nozzle 45 and the diffuser 46 is straightened by the multiple straightening plates 31 provided on each. Therefore, the pump device 1 having the straightening member 14 on the jet tube 2 has the same effect as the pump device 1 of each of the above-mentioned embodiments.

In the above example, the straightening member 14 is disposed in the pump 13 or the jet tube 2, but the present invention is not limited to this. For example, as in the pump device 1 according to the eighth embodiment shown in FIG. 17, the pipe 51 connected to the suction port 21a may be a cylindrical portion 32, and multiple straightening plates 31 may be provided on this pipe 51. This pipe 51 may also be used as the suction pipe of the jet tube 2. As shown in FIG. 17, the pump 13 of the pump device 1 may be a multi-stage pump having multiple impellers 22.

In the above example, the straightening member 14 has a configuration having multiple straightening plates 31, but the multiple straightening plates 31 may be of the same shape as in the above examples, or, as in the pump device 1 according to the ninth embodiment shown in FIG. 18, the multiple straightening plates 31 may be configured by arranging straightening plates 31A and 31B of different shapes at equal intervals. In FIG. 18, the straightening plate 31A shows an example of the straightening plate 31 according to the first embodiment, and the straightening plate 31B shows an example of the straightening plate 31 according to the second embodiment, but the present invention is not limited to this and can be set as appropriate.

In the above example, the pump device 1 is configured such that the pressure sensor 15 and the flow sensor 16 are located at different positions, but this is not limited thereto. For example, 15 in FIG. 2 may be a pressure-controlled valve, and 16 in FIG. 2 may be a so-called integrated pressure and flow sensor in which the pressure sensor and the flow sensor are located at the same position.

The present invention is not limited to the above-mentioned embodiment, and can be modified in various ways without departing from the gist of the present invention. The embodiments may be combined as appropriate, and in that case, the combined effect can be obtained. Furthermore, the above-mentioned embodiment includes various inventions, and various inventions can be extracted by combinations selected from the multiple components disclosed. For example, if the problem can be solved and the effect can be obtained even if some components are deleted from all the components shown in the embodiment, the configuration from which the components are deleted can be extracted as an invention.
The following provides a description equivalent to the invention described in the original claims of this application.
[1] An impeller having a plurality of blades;
A casing that houses the impeller;
a straightening member provided within the suction port of the casing or within a connecting member that forms a flow path connected to the suction port of the casing, the straightening member having the same number of straightening plates as the blades of the impeller.
[2] The pump device described in [1], wherein the straightening plate is provided radially outward from the center of the suction port or the connecting member where the straightening member is provided, more than 50% diameter of the suction port or the connecting member.
[3] The pump device according to [1] or [2], wherein the baffle plate is integrally formed with an inner circumferential surface of the suction port or an inner circumferential surface of the connecting member, and the inner circumferential surface of the suction port or the inner circumferential surface of the connecting member is inclined toward the center toward the impeller.
[4] The straightening member has a cylindrical tube portion having an inner circumferential surface on which the straightening plate is integrally provided,
The pump device according to claim 1 or 3, wherein the cylindrical portion is inclined toward the center toward the impeller.
[5] The pump device according to any one of [1] to [4], wherein the plurality of baffle vanes have an angle that is the same as or approximate to an inlet angle of the plurality of blades of the impeller.
[6] The pump device according to any one of [1] to [5], wherein the thickness of the flow straightening vane changes from the primary side to the secondary side.
[7] A cylindrical portion provided integrally or separately to a casing that houses an impeller or a connecting member that forms a flow path connected to an intake port of the casing;
A number of baffles provided on an inner circumferential surface of the cylindrical portion is the same as the number of blades of the impeller;
A straightening member comprising:
[8] The straightening member according to [7], wherein the straightening plate is provided radially outward of a 50% diameter of the cylindrical portion.
[9] The flow straightening member according to [7] or [8], wherein an inner circumferential surface of the cylindrical portion is inclined toward the impeller.
[10] The straightening member according to any one of [7] to [9], wherein the plurality of straightening plates have an angle that is the same as or approximate to the inlet angle of the plurality of blades of the impeller.
[11] The straightening member according to any one of [7] to [10], wherein the thickness of the straightening plate changes from the primary side toward the secondary side.

Reference Signs List 1...pump device, 2...jet tube, 11...motor, 11a...casing, 12...rotating shaft, 13...pump, 14...flow straightening member (flow straightening structure), 14A...flow straightening member for nozzle, 14B...flow straightening member for diffuser, 15...pressure sensor, 16...flow sensor, 21...casing, 21a...suction port, 21b...pump chamber, 21c...discharge port, 21d...pressure pipe connection port, 21e... Guide vane, 22...impeller, 25...rear shroud, 26...front shroud, 26a...mouth, 27...blade, 31...blade, 31a...chamfered portion, 32...tube portion, 41...suction pipe, 42...pressure pipe, 43...junction pipe, 43a...opening, 43b...strainer, 43c...suction passage portion, 43d...junction passage portion, 44...check valve, 45...nozzle, 46...diffuser, 51...piping.

Claims (7)

a front shroud having a mouth for sucking water therein and facing the rear shroud; and an impeller having a plurality of blades provided between the rear shroud and the front shroud;
A casing that houses the impeller;
a straightening member provided within the suction port of the casing and having the same number of straightening plates as the number of the blades of the impeller;
Equipped with
The suction port has a diameter equal to or slightly larger than the diameter of the mouth of the impeller;
The blades extend from opposing surfaces of the rear shroud and the front shroud along an axial direction of the impeller and are curved in a direction perpendicular to the axial direction,
The straightening vane is plate-shaped, extends radially from an inner peripheral surface of the suction port, and extends linearly along an axial direction, with a main surface direction aligned with the axial direction of the suction port,
The flow straightening plate is integrally formed on an inner peripheral surface of the suction port,
A pump device , wherein an inner circumferential surface of the suction port is inclined toward a center toward the impeller . a front shroud having a mouth for sucking water therein and facing the rear shroud; and an impeller having a plurality of blades provided between the rear shroud and the front shroud;
A casing that houses the impeller;
a straightening member provided within the suction port of the casing and having the same number of straightening plates as the number of the blades of the impeller;
Equipped with
The suction port has a diameter equal to or slightly larger than the diameter of the mouth of the impeller;
The blades extend from opposing surfaces of the rear shroud and the front shroud along an axial direction of the impeller and are curved in a direction perpendicular to the axial direction,
The straightening vane is plate-shaped, extends radially from an inner peripheral surface of the suction port, and extends linearly along an axial direction, with a main surface direction aligned with the axial direction of the suction port,
the straightening member has a cylindrical portion having an inner circumferential surface on which the straightening plate is integrally provided,
The pump device, wherein the cylindrical portion is inclined toward the center toward the impeller. a front shroud having a mouth for sucking water therein and facing the rear shroud; and an impeller having a plurality of blades provided between the rear shroud and the front shroud;
A casing that houses the impeller;
a straightening member provided within the suction port of the casing and having the same number of straightening plates as the number of the blades of the impeller;
Equipped with
The suction port has a diameter equal to or slightly larger than the diameter of the mouth of the impeller;
The blades extend from opposing surfaces of the rear shroud and the front shroud along an axial direction of the impeller and are curved in a direction perpendicular to the axial direction,
The straightening vane is plate-shaped, extends radially from an inner peripheral surface of the suction port, and extends linearly along an axial direction, with a main surface direction aligned with the axial direction of the suction port,
A pump device, wherein the thickness of the flow straightening vane changes from the primary side to the secondary side. The pump device according to claim 1 or 2 , wherein the thickness of the flow straightening vane changes from the primary side to the secondary side. 5. The pump device according to claim 1, wherein the flow straightening plate is provided radially outwardly of a 50% diameter of the suction port from a center of the suction port at which the flow straightening member is provided. a suction pipe connected to a casing that houses the impeller;
a pressure pipe through which a portion of the water flowing in from the suction pipe and pressurized flows;
a junction pipe having an opening that joins the suction pipe and the pressure pipe at an upper end and opens to a water supply source, a suction flow passage portion that connects the opening to the suction pipe, and a junction flow passage portion that connects the suction flow passage portion to the middle of the suction flow passage portion and the pressure pipe;
a diffuser held in the suction passage;
a nozzle disposed on a primary side of the diffuser of the suction passage portion, the nozzle having, on an inner circumferential surface, a number of baffles equal to the number of blades of the impeller;
A jet tube comprising: The jet tube according to claim 6 , wherein the diffuser has the plurality of baffles on an inner circumferential surface thereof.