Self-priming pump

Abstract

To provide a pump casing and self-priming type pump which can reduce a self-priming time.SOLUTION: A pump casing according to an embodiment forms a pump chamber which has a separation chamber and in which an impeller is arranged. At least a part of the pump casing includes a plurality of partition plates arranged in the separation chamber.SELECTED DRAWING: Figure 3

Description

Technical Field

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[0001] The present invention relates to a pump casing and a self-priming pump.

Background Art

[0002] A self-priming pump performs a pumping operation which is a normal operation, and a self-priming operation for shifting from the start of startup to the pumping operation. In the self-priming operation of such a self-priming pump, when the impeller rotates, the air in the casing is mixed with water and discharged into the discharge chamber as air-liquid mixed water. Thereby, a negative pressure is generated in the suction chamber, and the air in the pumping pipe connected to the suction port is sucked up. The air-liquid mixed water discharged into the discharge chamber separates into air and water in the discharge chamber. The separated water is circulated back to the suction chamber again, mixed with the air in the casing by the impeller, and discharged into the discharge chamber. The self-priming pump repeats this process to raise the water surface in the pumping pipe. When the water surface reaches the height of the suction port, it shifts to the pumping operation. <​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​The pump casing according to this embodiment has a separation chamber and forms a pump chamber in which the impeller is arranged. The pump comprises a casing body, a discharge section having a discharge port, a suction section having a suction port, an impeller housed in the pump chamber, a first separation plate whose portion is at least partially disposed in the separation chamber and located at the upper part of the casing body, on the primary side of the center of the discharge section in the flow direction toward the discharge section, and a plurality of second separation plates whose portion is at least partially disposed in the separation chamber and arranged circumferentially on the primary side of the first separation plate in the flow direction, and which are smaller than the first separation plate, wherein the casing body has a cylindrical circumferential wall, the separation chamber is formed on the outlet side of the impeller, the first separation plate and the plurality of second separation plates are wall-like members that protrude into the separation chamber from the upper part of the circumferential wall, and the protruding height of the second separation plates is lower than the protruding height of the first separation plate. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a pump casing and a self-priming pump that can shorten the self-priming time. [Brief explanation of the drawing]

[0008] [Figure 1] A cross-sectional view of a self-priming pump according to one embodiment of the present invention. [Figure 2] Side view of the self-priming pump. [Figure 3] A cross-sectional view showing the internal structure of the self-priming pump. [Figure 4] A cross-sectional view showing a part of the self-priming pump. [Figure 5] A cross-sectional view showing a part of the self-priming pump. [Figure 6] A side view of the other side of the impeller of the self-priming pump. [Figure 7] A side view of one side of the guide vane of the self-priming pump. [Figure 8] A side view of the other side of the same guide vane. [Figure 9] A cross-sectional view of the pump casing of a self-priming pump according to another embodiment of the present invention. [Modes for carrying out the invention]

[0009] Hereinafter, a self-priming pump 10 according to one embodiment of the present invention will be described with reference to Figures 1 to 6. Figure 1 is a cross-sectional view of the self-priming pump 10 according to one embodiment of the present invention, and Figure 2 is a side view of the self-priming pump. Figure 3 is a cross-sectional view showing the internal configuration of the pump casing. Figure 4 is a cross-sectional view showing a part of the self-priming pump, showing a cross section along the gas-liquid separation plate 301. Figure 5 is a cross-sectional view showing a part of the self-priming pump, showing a cross section along the auxiliary separation plate 302. Figure 6 is a side view of the impeller 14. Figure 7 is a side view showing the configuration of one side of the guide vane 15, and Figure 8 is a side view showing the configuration of the other side of the guide vane 15.

[0010] As shown in Figures 1 to 3, the self-priming pump 10 comprises a frame 11, a motor 12 mounted on the frame 11, a pump casing 13 mounted on the frame 11, an impeller 14 housed within the pump casing 13, guide vanes 15 positioned opposite the impeller 14 within the pump casing 13, and a sealing device 16 mounted around the rotation shaft 12a of the motor 12. The self-priming pump 10 is a pumping device that pressurizes fluid and pumps it to the secondary side, and is positioned horizontally with the rotation shaft 12a aligned horizontally. The self-priming pump 10 is configured as a self-priming pump unit, for example, by connecting a pumping pipe to the primary side and a discharge pipe to the secondary side.

[0011] The frame 11 has a horizontal mounting surface 11a positioned at a predetermined height. The frame 11 supports the motor 12 and the lower part of the pump casing 13 on the mounting surface 11a.

[0012] The motor 12 is mounted on a frame 11 and has a horizontally extending rotating shaft 12a. An impeller 14 is attached to one end of the rotating shaft 12a. The motor 12 is rotationally driven by the control unit, which rotates the impeller 14 fixed to the rotating shaft 12a.

[0013] The pump casing 13 includes, for example, a casing 31 and a cover 32, and forms a pump chamber 38 that houses an impeller 14 and a guide vane 15 therein. The pump casing 13 is disposed on one side of the motor 12 and is fixed to the pedestal 11.

[0014] The casing 31 is made of a resin or a metal material, and integrally includes a cylindrical casing body 33, a suction part 34, a discharge part 35, and a partition part 36. Further, the casing 31 includes, at its upper part, a gas-liquid separation plate 301 as a first separation plate, and auxiliary separation plates 302, 303, 304 as second separation plates.

[0015] The casing body 33 is configured in a cylindrical shape and surrounds the outer peripheries of the impeller 14 and the guide vane 15. The suction part 34 is continuously arranged at one axial end side of the casing body 33. The other end side of the casing body 33 forms an opening 33a that is closed by the cover 32. A plug hole 33b that is opened and closed by the attachment and detachment of a plug 39 is formed at the lower part of the casing body 33. The casing body 33 integrally has a bottom part 33c connected to the suction part 34 and a peripheral wall part 33d extending axially from the bottom part 33c. The discharge part 35 is provided on the peripheral wall part 33d, and the opening 33a is formed at the end part of the peripheral wall part 33d on the motor side. <000008​​​​​​​

[0018] For example, the gas-liquid separation plate 301 protrudes radially inward near the upper end connected to the discharge part 35 among the peripheral wall parts of the casing body 33. For example, in the flow direction along the peripheral wall part toward the discharge part 35, the gas-liquid separation plate 301 protrudes radially inward from a position on the primary side of the center of the discharge part 35, that is, the left side of the upper end when the flow direction is clockwise in FIG. 3.

[0019] Also, the plurality of auxiliary separation plates 302, 303, 304 are arranged side by side on the primary side in the flow direction with respect to the gas-liquid separation plate 301. For example, the auxiliary separation plates 302, 303, 304 are provided in the separation region generated on the primary side of the gas-liquid separation plate 301. As an example, in the present embodiment, one gas-liquid separation plate 301 and three auxiliary separation plates 302, 303, 304 are arranged side by side at equal intervals in the circumferential direction on the peripheral wall part of the casing body 33. For example, starting from the central axis of the discharge port 35a and centering on the central position of the casing body 33, four separation plates 301, 302, 303, 304 are arranged side by side at a central angle of 22.5 degrees.

[0020] The auxiliary separation plates 302, 303, 304 are preferably configured to be smaller than the gas-liquid separation plate 301. As an example, in the present embodiment, the auxiliary separation plates 302, 303, 304 are configured such that the opposing area orthogonal to the flow direction is smaller than that of the gas-liquid separation plate 301, specifically, the length in the radial direction which is the protruding height is smaller. For example, the protruding height L2 of the auxiliary separation plates 302, 303, 304 is, for example, 1 / 4 to 3 / 4 of the protruding height L1 of the gas-liquid separation plate 301, and preferably, the protruding height L2 of the auxiliary separation plates 302, 303, 304 is, for example, about 1 / 2 of the protruding height L1 of the gas-liquid separation plate 301. As an example, the axial dimension S1 of the gas-liquid separation plate 301 and the axial dimension S2 of the plurality of auxiliary separation plates 302, 303, 304 are configured to be about the same. That is, the ends of the plurality of separation plates 301, 302, 303, 304 on the motor 12 side are arranged at the same position in the axial direction. Also, as an example, the thickness dimension T1 of the gas-liquid separation plate 301 and the thickness dimension T2 of the plurality of auxiliary separation plates 302, 303, 304 are configured to be about the same.

[0021] The gas-liquid separation plate 301 and the auxiliary separation plates 302, 303, and 304 are formed in the axial direction at a position corresponding to the discharge port 35a. That is, the ends of the gas-liquid separation plate 301 and the auxiliary separation plates 302, 303, and 304 on the motor 12 side are positioned in the axial direction closer to the motor 12 than the discharge port 35a.

[0022] Reinforcing ribs 305 are formed on the inner surface of the casing body 33. For example, the ribs 305 are wall-like portions that protrude inward from the inner surface of the casing body 33, and are formed from the bottom portion 33c on the suction port 34a side to the corner portion connecting to the peripheral wall portion 33d.

[0023] For example, the separation plates 301, 302, 303, and 304 are formed integrally and continuously with the rib 305. For example, the gas-liquid separation plate 301 and the auxiliary separation plates 302, 303, and 304 are formed extending axially toward the motor 12 from the rib 305 formed at the bottom 33c and corner on the suction port 34a side.

[0024] The suction section 34 is cylindrical in shape and has a suction port 34a that opens on one side in the axial direction, and also forms a suction chamber 38a that communicates with the suction port 34a. A check valve 37 is provided in the suction chamber 38a.

[0025] The discharge section 35 is cylindrical in shape and is arranged continuously with the upper part of the casing body 33. The discharge section 35 has an upward-opening discharge port 35a and forms a discharge chamber 38c that communicates with the upper part of the pump chamber 38.

[0026] The partition wall 36 is a wall-like member that separates the primary side and the secondary side of the impeller 14.

[0027] The cover 32 is made of resin or metal and integrally comprises a first cover body 32a connected to one end of the motor 12 and a disc-shaped second cover body 32b that closes the opening of the casing body 33. The inner circumferential edge of the first cover body 32a is connected to the outer circumferential edge of one end of the motor 12, and its outer circumferential edge is connected to the outer circumferential edge of the second cover body 32b. An axial hole 32c is formed in the center of the second cover body 32b through which the rotating shaft 12a passes via a sealing device 16. The radially central side of the second cover body 32b is raised toward the motor 12 in the axial direction.

[0028] The impeller 14 and guide vanes 15 are arranged in the pump chamber 38, which is the space inside the pump casing 13, thereby forming a suction chamber 38a extending from the suction port 34a to the inlet 14a of the impeller 14, a separation chamber 38b located on the secondary side (outflow side) of the outlet 14b of the impeller 14, a discharge chamber 38c extending from the top of the separation chamber 38b to the discharge port 35a, and a rear chamber 38d formed on the back side of the impeller 14. For example, the separation chamber 38b is formed above the center of the impeller 14.

[0029] The impeller 14 is, for example, a semi-open type and comprises a first shroud 41 and one or more blade members 42 formed on one side of the first shroud 41. The impeller 14 is rotatably supported around the rotation axis 12a.

[0030] The first shroud 41 is constructed in a circular plate shape and has an axial hole 41a in the center. A gap is formed between the first shroud 41 and the cover of the pump casing 13. In addition, the radially central side of the first shroud 41 is raised on one side in the axial direction, and a rear chamber 38d is formed between the first shroud 41 and the second cover body 32b which is raised on the motor 12 side on the back side of the first shroud 41.

[0031] Multiple blade members 42, for example five in this embodiment, are provided at equal intervals in the circumferential direction. The multiple blade members 42 extend from the outer edge of the first shroud 41 toward the center, curving with a predetermined curvature.

[0032] The impeller 14 rotates under the drive of the motor 12, drawing in fluid from the inlet 14a and discharging the fluid outward and circumferentially from the outlet 14b on the outer circumference, thereby pressurizing the fluid from the primary side to the secondary side.

[0033] The guide vane 15 is positioned opposite to the impeller 14 on one axial side. The guide vane 15 comprises a guide plate 51 positioned opposite to the impeller 14 on one side, and a plurality of guide blades 52 formed on the main surface of the guide plate 51 on the impeller 14 side.

[0034] The guide plate 51 has an opening 51a in the center. A recess for accommodating an O-ring 51d is formed at the edge of the opening 51a of the guide plate 51. The guide plate 51 is assembled to the pump casing 13 via the O-ring 51d.

[0035] Multiple guide vanes 52 are erected from the guide plate 51. The guide vanes 52 are arranged around the outer circumference of the impeller 14 and guide the fluid flowing out of the impeller 14.

[0036] The sealing device 16 is a mechanical seal mounted around the rotating shaft 12a, which fluid-tightly seals the space between the pump casing 13 and the rotating shaft 12a of the motor 12.

[0037] In the self-priming pump configured as described above, a predetermined flow path is formed inside the pump casing 13, from the suction port 34a, through the inlet 14a and outlet 14b of the impeller 14, the separation chamber 38b, and the discharge chamber 38c, to the discharge port 35a.

[0038] The self-priming pump 10 configured as described above performs both normal operation, which is pumping operation, and self-priming operation, which is the period from startup to transitioning to pumping operation.

[0039] The self-priming pump 10 performs a pumping operation by increasing the pressure of water drawn up from the pumping pipe connected to the primary side of the suction port 34a and discharging it from the discharge port 35a. In addition, after starting up, the self-priming pump 10 will perform a self-priming operation if the flow path in the primary side pumping piping from the suction port 34a to the discharge port 35a is not filled with water.

[0040] At the start of self-priming operation, for example, water for starting up is injected into the pump chamber from a separately provided tank, immersing the impeller 14 in water. In this state, as part of self-priming operation, the impeller 14 is rotated, mixing the air and water in the pump casing 13, and sending the gas-liquid mixed water to the separation chamber 38b. At this time, the gas-liquid separation plate 301 in the separation chamber 38b promotes the separation of air and water. In the separation region that occurs on the secondary side of the gas-liquid separation plate 301, the water flow does not become a smooth flow, but rather a slow vortex flow. Here, air bubbles gather and come into contact with each other, making it easier for the bubbles to coalesce, thus promoting gas-liquid separation. In the primary side region of the gas-liquid separation plate 301, the auxiliary separation plates 302, 303, and 304 further promote gas-liquid separation.

[0041] In self-priming operation, the water in the suction chamber is mixed with air as the impeller rotates, and the resulting gas-liquid mixture is discharged into the separation chamber on the discharge side. This action creates negative pressure in the suction chamber, drawing air from the pumping pipe upwards. The gas-liquid mixture discharged into the separation chamber is then separated into air and water. Some of the water, from which the air has been separated, returns to the suction chamber or pump chamber. This water is then mixed with air again by the rotation of the impeller and discharged into the separation chamber as a gas-liquid mixture.

[0042] Through this process, the self-priming pump 10 raises the water level in the pumping pipe, and once the water level reaches the height of the suction port 34a and the pumping pipe is filled with water, it switches to pumping operation.

[0043] The self-priming pump 10 according to this embodiment has a separation plate that protrudes into the separation chamber 38b in the casing, and an auxiliary separation plate positioned on the primary side of the separation plate. Therefore, gas-liquid separation can be promoted within the separation chamber, accelerating the self-priming operation and shortening the self-priming time. Furthermore, by positioning the auxiliary separation plate in, for example, the separation region on the primary side of the gas-liquid separation plate, the influence on the water flow can be suppressed, and HQ performance can be maintained.

[0044] For example, in a test comparing Comparative Example 1, which does not have an auxiliary separation plate 302, with Example 1, which has one auxiliary separation plate 302, the results showed that in Comparative Example 1, self-priming was not possible at a total suction head of 6m (self-priming was not possible above 4m), whereas in Example 1, which has one auxiliary separation plate 302, self-priming was possible, and there was no change in HQ performance. In other words, according to Example 1, by providing an auxiliary separation plate 302, it is possible to improve self-priming performance while maintaining HQ performance.

[0045] Tests of Example 2, which was equipped with two auxiliary separation plates 302 and 303, showed that self-priming was possible in a shorter time than in Example 1, which was equipped with one auxiliary separation plate 302, and there was no change in HQ performance. In other words, according to Example 2, by providing two auxiliary separation plates 302 and 303 on the primary side of the gas-liquid separation plate, self-priming performance can be further improved while maintaining HQ performance.

[0046] Tests of Example 3, which was equipped with three auxiliary separation plates 302, 303, and 304, showed that self-priming was possible in an even shorter time than in Example 1, which was equipped with one auxiliary separation plate 302, and in Example 2, which was equipped with two auxiliary separation plates 302, and there was no change in HQ performance. In other words, according to Example 3, by providing three auxiliary separation plates 302, 303, and 304 on the primary side of the gas-liquid separation plate, self-priming performance can be further improved while maintaining HQ performance.

[0047] However, the present invention is not limited to the embodiments described above.

[0048] For example, the above embodiment shows an example with three auxiliary separation plates 302, 303, and 304, but it is not limited to this, and the auxiliary separation plate 302 may be one, two, or four or more.

[0049] Furthermore, although the above embodiment shows an example in which the protruding heights of the three auxiliary separation plates 302, 303, and 304 are equal, the invention is not limited to this, and the protruding heights of the multiple auxiliary separation plates 302, 303, and 304 may be different from each other. For example, they may be configured so that the protruding heights become lower towards the primary side. Alternatively, they may be arranged so that the high and low protruding heights alternate in order.

[0050] Furthermore, although the above embodiment shows an example in which the gas-liquid separation plate 301 and the multiple auxiliary separation plates 302 have the same axial length, the invention is not limited to this, and the axial dimensions of the gas-liquid separation plate 301 and the multiple auxiliary separation plates 302, 303, and 304 may be different.

[0051] Furthermore, in the above embodiment, the gas-liquid separation plate 301 and the auxiliary separation plates 302, 303, and 304 are shown to extend to a position facing the discharge port 35a, but the embodiment is not limited to this. For example, the gas-liquid separation plate 301 and the auxiliary separation plates 302, 303, and 304 may extend beyond the discharge port 35a to the position of the motor 12.

[0052] In the above embodiment, a round pump casing is shown, but the invention is not limited to this. For example, as shown in Figure 9, it can also be applied to a pump casing 13A having a rectangular section. In the rectangular pump casing 13A of this embodiment, a gas-liquid separation plate 301A protruding downward is formed in the center of the upper wall, and auxiliary separation plates 302A and 303A, which are smaller than the gas-liquid separation plate 301A, are formed at a position on the primary side in the rotational direction of the impeller. In this embodiment as well, the same effects as in the first embodiment can be obtained.

[0053] It should be noted that the present invention is not limited to the embodiments described above, and can be modified in various ways during implementation without departing from its essence. Furthermore, each embodiment may be combined as appropriate, and in that case, the combined effects can be obtained. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from the multiple constituent elements disclosed. For example, if the problem can be solved and effects obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, then the configuration with these deleted constituent elements can be extracted as an invention. The following is an appended description equivalent to the invention described in the claims of the original application. [1] It has a separation chamber and forms a pump chamber in which an impeller is located. A pump casing comprising a plurality of separation plates, at least a portion of which are arranged in the separation chamber. [2] The casing body forming the pump chamber, A discharge section having a discharge port, It comprises a suction section having a suction port, The pump casing according to [1], wherein the plurality of separators comprises a first separator provided on the upper part of the casing body and a second separator arranged on the primary side in the flow direction of the first separator and smaller than the first separator. [3] The casing body has a cylindrical peripheral wall, and the separation chamber is formed on the outlet side of the impeller. The first and second separation plates are wall-like members that protrude into the separation chamber from the upper part of the peripheral wall. The pump casing according to [2], wherein the protrusion height of the second separator plate is lower than the protrusion height of the first separator plate. [4] The pump casing according to [2], comprising a plurality of the second separation plates. [5] The pump casing according to [3], wherein in a plurality of the aforementioned second separators, the second separator arranged on the primary side in the flow direction is smaller than the second separator arranged on the secondary side. [6] A pump casing as described in any of [1] or [5], The impeller housed within the pump casing, A guide vane having a guide plate and one or more guide blades, which are arranged opposite each other on one side in the axial direction of the impeller, A self-priming pump equipped with [a specific feature]. [Explanation of Symbols]

[0054] 10...Self-priming pump, 11...Stand, 11a...Mounting surface, 12...Motor, 12a...Rotating shaft, 13...Pump casing, 13A...Pump casing, 14...Impeller, 14a...Inlet, 14b...Outlet, 15...Guide vane, 16...Sealing device, 31...Casing, 32...Cover, 32a...Cover body, 32b...Cover body, 32c...Shaft hole, 33...Casing body, 33a...Opening, 33b...Plug hole, 33c...Bottom, 33d...Peripheral wall, 34 ...Suction section, 34a...Suction port, 35...Discharge section, 35a...Discharge port, 36...Partition section, 37...Check valve, 38...Pump chamber, 38a...Suction chamber, 38b...Separation chamber, 38c...Discharge chamber, 38d...Rear chamber, 39...Plug, 41...Shroud, 41a...Shaft hole, 42...Impeller member, 51...Guide plate, 51a...Opening, 51d...O-ring, 52...Guide vane, 301, 301A...Gas-liquid separation plate, 302, 302A, 303, 303A, 304...Auxiliary separation plate, 305...Rib.

Claims

1. A casing body that has a separation chamber and forms a pump chamber in which an impeller is located, A discharge section having a discharge port, A suction section having a suction port, The impeller housed in the pump chamber, At least a portion of the first separation plate is located in the separation chamber and is provided at the upper part of the casing body, on the primary side of the center of the discharge section in the flow direction toward the discharge section. At least a portion of the separation chamber is arranged in the separation chamber, and a plurality of second separation plates, which are smaller than the first separation plate, are arranged in a circumferential direction on the primary side of the first separation plate in the flow direction, The casing body has a cylindrical peripheral wall, and the separation chamber is formed on the outlet side of the impeller. The first separation plate and the plurality of second separation plates are wall-like members that protrude into the separation chamber from the upper part of the peripheral wall. The protruding height of the second separation plate is lower than the protruding height of the first separation plate. Self-priming pump.

2. The self-priming pump according to claim 1, wherein in a plurality of the second separator plates, the second separator plate located on the primary side in the flow direction is smaller than the second separator plate located on the secondary side.

3. The self-priming pump according to claim 1, wherein the first separator plate and the tips of the plurality of second separator plates are arranged at the same position in the axial direction.

4. A guide vane having a guide plate and one or more guide blades arranged opposite to one side in the axial direction of the impeller, A self-priming pump according to any one of claims 1 to 3, comprising:

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