Pump equipment

Abstract

To provide a pump casing having high castability and high versatility, and to provide a pump device.SOLUTION: A pump casing includes a suction port and a pump chamber which houses an impeller. The pump casing further includes: a suction flange provided at the suction port; a pressure gauge attachment hole which allows the suction flange and the suction port to communicate with each other; and a barrier provided at the primary side as seen in a rotation direction of the impeller of the pressure gauge attachment hole on an inner peripheral surface of the suction port, the barrier extending in an axial direction of the suction port over an area from the suction flange side to the impeller side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention can measure the suction pressure. Rupo Regarding pump devices. [Background technology]

[0002] In pump performance tests, the JIS standard has traditionally stipulated that the suction pressure measurement point should be located at a distance (2D1) twice the pipe diameter D1 from the casing suction flange. However, if it is difficult to locate the suction pressure measurement point at a distance (2D1) twice the pipe diameter D1 from the casing flange, the pressure can be measured through a pressure gauge mounting hole provided in the casing suction flange.

[0003] However, when measuring pressure using a pressure gauge mounting hole provided in the suction flange, there is a risk that the suction pressure will differ from the pressure measured at a distance (2D1) twice the pipe diameter D1 from the suction flange due to the influence of the pump device's operation, such as the generation of swirling flow from the gap between the liner ring and the impeller, in the low water flow range, and that the pump performance test results will differ.

[0004] For this reason, a technique is known in which a flow straightening plate extending in a direction perpendicular to the axis of the pressure gauge mounting hole is provided at the suction port of the casing to obstruct the swirling flow.

[0005] Other known technologies include providing multiple fins on the liner section at a predetermined angle to prevent swirling flow (see, for example, Patent Document 1), and providing multiple straightening plates extending axially and radially inward at the casing intake port (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-92565 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-201999 Summary of the Invention [Problem to be solved by the invention]

[0007] For example, the technique of providing a straightening plate that extends perpendicular to the axis of the pressure gauge mounting hole has poor castability, and if the rotating shaft is extended, there is a risk that it will interfere with the straightening plate, which may reduce the versatility of the pump device.

[0008] The technology of Patent Document 1 requires the provision of multiple fins, which increases the number of manufacturing steps and costs. The technology of Patent Document 2 has poor castability, and there are concerns that it may increase costs, reduce versatility, and make it difficult to produce large amounts of water.

[0009] Therefore, the present invention is a method for manufacturing a casting material having high castability and high versatility. Ipo The object of the present invention is to provide a pump device. [Means for solving the problem]

[0010] According to an embodiment of the present invention Pump equipment A pump casing having a suction port and a pump chamber that houses an impeller. and the impeller housed in the pump casing. And, The pump casing comprises: a suction flange provided at the suction port; a pressure gauge mounting hole communicating between the suction flange and the suction port; The pressure gauge is provided on the primary side of the pressure gauge mounting hole in the rotation direction. a barrier extending in the axial direction of the suction port from the suction flange side to the impeller side. The barrier is a long protrusion along the axial direction of the suction port, the height of the barrier is 1 mm or more and 15 mm or less, the end of the barrier on the suction flange side in the axial direction of the suction port is disposed between the suction port and the pressure gauge mounting hole, and the end of the barrier on the pump chamber side is disposed between the pressure gauge mounting hole and the impeller mouth of the impeller. . [Effects of the Invention]

[0011] According to the present invention, the alloy has high castability and is highly versatile. Ipo A pumping device can be provided. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a partial cross-sectional view showing the configuration of a pump device according to an embodiment of the present invention; [Figure 2]FIG. 2 is an enlarged cross-sectional view showing the configuration of a pump of the pump device. [Figure 3] FIG. 2 is a front view showing the configuration of the suction port of the pump casing used in the pump. [Figure 4] FIG. 4 is an explanatory diagram showing the results of an evaluation test of the pump device. [Figure 5] FIG. 4 is an explanatory diagram showing the results of an evaluation test of the pump device. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, the configurations of a pump device 1 and an impeller 33 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. Fig. 1 is a partial cross-sectional view showing the configuration of a pump device 1 according to one embodiment of the present invention. Fig. 2 is an enlarged cross-sectional view showing the configuration of a pump 12 of the pump device 1, and Fig. 3 is a front view showing the configuration of an inlet 311 of a pump casing 31 used in the pump 12.

[0014] 1, the pump device 1 includes, for example, a motor 11, a pump 12, a shaft coupling 13, and a shaft cover 14. The pump device 1 also includes, for example, a base 15 to which the motor 11 and the pump 12 are fixed. In the example shown in FIG. 1, the pump device 1 is a horizontal shaft pump, but it may also be a vertical shaft pump.

[0015] The motor 11 includes a motor casing 21, a stator housed in the motor casing 21, a rotor rotated by the stator, and a motor shaft 22 fixed to the rotor. The motor 11 is connected to the pump 12, and drives the pump 12 as the motor shaft 22 rotates. The motor casing 21 is fixed to a base 15. The motor shaft 22 is connected to the pump 12 via a shaft coupling 13.

[0016] The pump 12 includes a pump casing 31, a casing cover 32, an impeller 33, and a rotating shaft 34. The pump 12 also includes one or two liner rings 35 and a shaft sealing member 36 such as a mechanical seal. The rotating shaft 34 of the pump 12 is connected to the motor shaft 22 via a shaft coupling 13. The pump 12 may be a single-stage pump having a single impeller 33, or may be a multi-stage pump having a plurality of impellers 33.

[0017] The pump casing 31 is fixed to, for example, the base 15. The pump casing 31 has a pump chamber 31a therein and houses the impeller 33. The pump casing 31 has a suction port 311 and a discharge port 315. For example, the suction port 311 is disposed at one axial end of the pump casing 31, and an opening 31c through which the impeller 33 can be inserted is formed at the other axial end. In addition, the discharge port 315 is disposed on the circumferential surface of the pump casing 31, for example, at the upper end, and legs for fixing the pump casing 31 to the base 15 are formed at the lower end.

[0018] Suction port 311 communicates with pump chamber 31a. Suction port 311 includes suction flange 312, pressure gauge mounting hole 313, and barrier wall 314. For example, piping is connected to suction flange 312. For example, the inner diameter of suction port 311 gradually increases from the suction flange 312 side toward pump chamber 31a side.

[0019] The suction flange 312 has a plurality of bolt holes 312 a formed therein for fixing the flange 99 a of the pipe 99 .

[0020] Pressure gauge mounting hole 313 is an opening that extends in a direction perpendicular to the axial direction of suction port 311. A female thread is formed on the outer peripheral surface of suction flange 312 so that a pressure gauge can be connected to pressure gauge mounting hole 313. Pressure gauge mounting hole 313 is formed in the location where suction flange 312 is provided, and connects the inner surface of suction port 311 with the outer surface of suction flange 312. Pressure gauge mounting hole 313 extends horizontally, passing through the center of suction port 311 in the direction of gravity (vertical direction) of pump device 1, which is, for example, a horizontal axis pump.

[0021] The barrier wall 314 is integrally formed on the inner peripheral surface of the suction port 311. The barrier wall 314 is a protrusion that is long in one direction along the axial direction of the suction port 311. The barrier wall 314 is provided on the primary side of the pressure gauge mounting hole 313 in the rotation direction of the impeller 33, as indicated by the arrow in FIG. 3 . For example, the longitudinal direction of the barrier wall 314 extends along the axial direction of the suction port 311, and the height direction of the barrier wall 314, which is perpendicular to the longitudinal direction, extends from the inner peripheral surface of the suction port 311 along the axial direction (horizontal direction) of the pressure gauge mounting hole 313. In addition, in the longitudinal direction (axial direction of the suction port 311), the end of the barrier wall 314 on the suction flange 312 side is disposed between the suction port 311 and the pressure gauge mounting hole 313, and the end of the barrier wall 314 on the pump chamber 31a side is disposed between the pressure gauge mounting hole 313 and an impeller mouth 42a (liner ring 35) of the impeller 33, which will be described later.

[0022] Next, as a specific example, a suitable example of the configuration of the barrier 314 will be described. The thickness of the barrier 314 is A, the height of the barrier 314 is B, the distance between the barrier 314 and the pressure gauge mounting hole 313 is C, and the length of the barrier 314 is D. The thickness A of the barrier 314 is the width in the directions perpendicular to the height and longitudinal directions of the barrier 314. The height B of the barrier 314 is the width from the end of the barrier 314 on the pressure gauge mounting hole 313 side of the inner circumferential surface of the suction port 311 to the tip in the horizontal direction. The distance C between the barrier 314 and the pressure gauge mounting hole 313 is the distance between the upper end of the pressure gauge mounting hole 313 and the lower end of the barrier 314 in the direction of gravity (vertical direction). The length D of the barrier 314 is the width in the horizontal direction along the axial direction of the suction port 311.

[0023] Also, let L be the distance in the axial direction from the end where the suction port 311 opens to the impeller mouth 42a (or the liner ring 35 if provided).

[0024] The thickness A of the barrier 314 is set to be 5 mm or more and 10 mm or less. The height B of the barrier 314 is set to be 1 mm or more and 15 mm or less. The distance C between the barrier 314 and the pressure gauge mounting hole 313 is set to be 10 mm or less. The length D of the barrier 314 is set to be larger than the inner diameter of the pressure gauge mounting hole 313 and to be 3L / 4 or less.

[0025] For example, in the pump device 1 having a diameter of Φ80, the barrier 314 has a thickness A of 5 mm, a height B of 7 mm, a distance C of 2 mm, and a length D of 45 mm.

[0026] The discharge port 315 includes a discharge flange 316. The inside diameter of the discharge port 315 gradually increases from the pump chamber 31a side toward the discharge flange 316 side, for example.

[0027] The casing cover 32 covers the opening 31c of the pump casing 31. The casing cover 32 is formed so that the rotary shaft 34 can be inserted therein and a shaft seal device can be attached thereto.

[0028] 2, the impeller 33 includes a main plate 41, a side plate 42, and a plurality of blades 43. The impeller 33 is formed, for example, by casting. Note that the impeller 33 may be a so-called pressed impeller in which the main plate 41, the side plate 42, and the plurality of blades 43 are formed by pressing a metal material and integrally assembled by laser welding, or may be a resin impeller formed by resin molding.

[0029] The main plate 41 is a shroud. The main plate 41 is formed in a disk shape. The main plate 41 has an opening 41a in the center to which the boss and the rotary shaft 34 can be fixed. The side plate 42 is a shroud and is formed in a disk shape with an impeller mouth 42a formed in the center.

[0030] The blades 43 are arranged, for example, at equal intervals in the circumferential direction. The blades 43 are curved with a predetermined radius of curvature having one or more centers of curvature. The blades 43 may have a so-called two-dimensional shape extending along the axial direction (the opposing direction of the main plate 41 and the side plate 42), or may have a so-called three-dimensional shape inclined with respect to the axial direction.

[0031] The impeller 33 is fixed to one end of the rotary shaft 34. The rotary shaft 34 is disposed outside the casing cover 32, and the shaft coupling 13 is provided to the other end.

[0032] The liner ring 35 is provided between the pump casing 31 and the impeller 33. As a specific example, the liner ring 35 is fixed to the pump casing 31. The liner ring 35 fixed to the pump casing 31 faces the impeller mouth 42a of the impeller 33 with a predetermined gap therebetween. The liner ring 35 may also be provided between the casing cover 32 and the impeller 33.

[0033] The mechanical seal 36 seals the space between the rotary shaft 34 and the casing cover 32 .

[0034] The shaft coupling 13 connects the motor shaft 22 and the rotating shaft 34 .

[0035] The shaft cover 14 covers the motor shaft 22, the rotating shaft 34, and the shaft coupling 13. For example, the shaft cover 14 is fixed to the pump casing 31 and the motor 11. The shaft cover 14 also includes a plurality of bearing members 51 that rotatably support the rotating shaft 34.

[0036] The base 15 is fixed to the installation location of the pump device 1. The base 15 has a plurality of screw holes so that the motor 11, the pump 12, and the shaft cover 14 can be fixed thereto with fastening members such as bolts.

[0037] According to the pump device 1 using the pump casing 31 configured in this manner, by providing the barrier 314, the same pressure can be measured when measuring the suction pressure by attaching a pressure gauge to the pressure gauge mounting hole 313 and when measuring the suction pressure based on the JIS standard, and since the height B can be low, high castability and versatility can be achieved.

[0038] The results of the evaluation test of the embodiment are shown below. As an evaluation test, a barrier 314 was provided as an embodiment and the suction pressure was measured at the pressure gauge mounting hole 313 (measurement position H1). The pump device had a diameter of Φ80, and the barrier 314 had a thickness A of 5 mm, a height B of 7 mm, a distance C of 2 mm, and a length D of 45 mm.

[0039] For comparison with the embodiments, Comparative Example 1 was used to measure the suction pressure at measurement position 2D1, which is twice the pipe diameter (inner diameter) ΦD1 from suction flange 312 of piping 99 based on JIS standards. For comparison with the embodiments, Comparative Example 2 was used to measure the suction pressure at measurement position H1, without barrier 314, and with a flow straightening plate 80, shown by the two-dot chain line in Figures 2 and 3, installed at suction port 311, as in a conventional pump device. In Comparative Examples 1 and 2, the pump device used a pump casing with the same diameter Φ80 as the embodiment and without barrier 314.

[0040] In addition, since the suction pressure measurement position in Comparative Example 1 is 2D1 based on the JIS standard, the suction pressure measured at measurement position 2D1 was used as the reference pressure, and evaluation was performed based on the pressure value that deviated from this suction pressure measured at measurement position 2D1 (reference pressure).

[0041] 4 and 5, the suction pressure (total head after shutoff) measured at measurement position 2D1, which serves as the reference suction pressure, was 35 m. In contrast, in Comparative Example 2, where a configuration was used without barrier 314, the suction pressure (total head after shutoff) measured at measurement position H1 was 31.5 m, which is 3.5 m different from the reference pressure. This is thought to be due to the swirling flow generated by liner ring 35 entering pressure gauge mounting hole 313.

[0042] On the other hand, in the case of the configuration having the barrier 314 of the embodiment, the suction pressure (total head after shutoff) measured at measurement position H1 was 35 m, which did not deviate from the reference pressure. This is thought to be because the barrier 314 was able to prevent the swirling flow from entering the pressure gauge mounting hole 313. Also, as shown in FIG. 5, the drive current, domain power, efficiency, and total head of Comparative Example 1 and the embodiment are almost identical. Therefore, by using a pump casing 31 provided with the barrier 314 of the embodiment on the primary side of the pressure gauge mounting hole 313, even when the suction pressure is measured at measurement position H1, it is possible to prevent the pump performance test results from differing from when the suction pressure is measured at measurement position 2D1 in accordance with the JIS standard.

[0043] 2 and 3, the height B of the barrier wall 314 of the pump casing 31 according to this embodiment may be lower. Therefore, the pump casing 31 having the barrier wall 314 allows for good flow of molten metal during casting, resulting in high castability, and also reduces the amount of material required compared to the barrier wall 80, thereby reducing costs. Furthermore, because the height B is lower, interference between the rotating shaft 34 and the barrier wall 314 can be prevented even if the length of the rotating shaft 34 is increased, and therefore the pump device 1 has high versatility.

[0044] As described above, in the pump casing 31 and the pump device 1 using the pump casing 31 according to this embodiment, by providing the barrier 314, even when the suction pressure is measured at the pressure gauge mounting hole 313 (measurement position H1), it is possible to prevent the measured pressure from deviating from the suction pressure measured at the measurement position 2D1 in accordance with the JIS standard, and it is possible to achieve high castability and high versatility.

[0045] The present invention is not limited to the above embodiment. In the above example, a configuration in which the liner ring 35 is provided between the impeller mouth 42a of the impeller 33 and the pump casing 31 has been described, but the present invention is not limited to this. For example, the pump device 1 may be configured such that a predetermined gap is provided between the outer circumferential surface of the impeller mouth 42a and the pump casing 31, and the liner ring 35 is not provided. Even in such a pump device 1, the barrier 314 can prevent the swirling flow generated between the pump casing 31 and the impeller mouth 42a from entering the pressure gauge mounting hole 313.

[0046] That is, the present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in appropriate combinations, in which case the combined effects can be obtained. Furthermore, the above-described embodiments include various inventions, and various inventions can be extracted by combining selected elements from the disclosed elements. For example, if the problem can be solved and the desired effect can be obtained even if some elements are deleted from all elements shown in the embodiments, the configuration from which these elements are deleted can be extracted as an invention. The following is a description equivalent to the invention described in the original claims of the present application. [1] A pump casing having a suction port and a pump chamber that houses an impeller, a suction flange provided at the suction port; a pressure gauge mounting hole communicating between the suction flange and the suction port; a barrier provided on an inner peripheral surface of the suction port on the primary side of the pressure gauge mounting hole in the rotation direction of the impeller, the barrier extending in the axial direction of the suction port from the suction flange side to the impeller side; A pump casing comprising: [2] A pump casing as described in [1], wherein the length of the barrier along the axial direction is greater than the inner diameter of the pressure gauge mounting hole and is 3L / 4 or less, when the distance from the end of the suction port to the impeller mouth of the impeller or a liner ring provided in the impeller mouth is L. [3] The height direction of the barrier is along the axial direction of the pressure gauge mounting hole, The pump casing according to [2], wherein the thickness of the barrier is 5 mm or more and 10 mm or less. [4] The pump casing according to [3], wherein the height of the barrier is 1 mm or more and 15 mm or less. [5] A pump casing according to any one of [1] to [4]; an impeller housed in the pump casing; A pump device comprising: [6] The pump device according to [5], which is a horizontal shaft pump. [Explanation of symbols]

[0047] 1...pump device, 11...motor, 12...pump, 13...shaft coupling, 14...shaft cover, 15...base, 21...motor casing, 22...motor shaft, 31...pump casing, 31a...pump chamber, 31c...opening, 32...casing cover, 33...impeller, 34...rotating shaft, 35...liner ring, 36...shaft seal member, 41...main plate, 41a...opening, 42...side plate, 42a...impeller mouth, 43...vane, 51...bearing member, 80...rectifier plate, 99...piping, 99a...flange, 311...suction port, 312...suction flange, 312a...bolt hole, 313...pressure gauge mounting hole, 314...barrier, 315...discharge port, 316...discharge flange, D1...pipe diameter, 2D1...measurement position, H1...measurement position.

Claims

1. A pump device comprising: a pump casing including a suction port and a pump chamber that houses an impeller; and the impeller housed in the pump casing, The pump casing comprises: a suction flange provided at the suction port; a pressure gauge mounting hole communicating between the suction flange and the suction port; a barrier provided on the primary side of the pressure gauge mounting hole in the rotational direction, extending in the axial direction of the suction port from the suction flange side to the impeller side; Equipped with The barrier is a long protrusion along the axial direction of the suction port, The height of the barrier is 1 mm or more and 15 mm or less, A pump device wherein, in the axial direction of the suction port, the end of the barrier wall on the suction flange side is positioned between the suction port and the pressure gauge mounting hole, and the end of the barrier wall on the pump chamber side is provided between the pressure gauge mounting hole and the impeller mouth of the impeller.

2. 2. The pump device according to claim 1, wherein the length of the barrier wall along the axial direction is greater than the inner diameter of the pressure gauge mounting hole and is 3 L / 4 or less, when the distance from the end of the suction port to the impeller mouth or a liner ring provided in the impeller mouth is L.

3. The height direction of the wall is along the axial direction of the pressure gauge mounting hole, 3. The pump device according to claim 2, wherein the thickness of the barrier is between 5 mm and 10 mm.

4. It is a horizontal shaft pump, the pressure gauge mounting hole is an opening that extends in a horizontal direction passing through a center of the suction port in a gravity direction and is perpendicular to the axial direction of the suction port, 4. The pump device according to claim 1, wherein a distance between an upper end of the pressure gauge mounting hole and a lower end of the barrier wall in the direction of gravity is 10 mm or less.

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