Vertical single suction self-priming pump

Abstract

To provide a vertical single suction self-priming pump whose self-priming performance is comparable to that of an all-water-passage self-priming pump while employing a single suction type that permits downsizing and weight reduction.SOLUTION: A vertical single suction self-priming pump 1 includes: a motor chamber 4 that accommodates a motor 3 having a motor shaft 2; an impeller 5 fixed to the motor shaft 2 protruded from the motor chamber 4; a pump chamber 6 that accommodates the impeller 5; a single channel 7 that is connected to an interior of the pump chamber 6 and is attached to an outer periphery of the motor chamber 4; and a gas-liquid separator 8 that extends from the interior of the pump chamber 6 into the single channel 7 so as to reach a predetermined height and divides an interior of the single channel 7 into a discharge side and a return side for returning to the pump chamber 6.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a single-channel vertical self-priming pump used for supplying and draining spring water or accumulated water at construction sites and the like. [Background technology]

[0002] Conventionally, self-priming pumps have been known in which priming water is poured into the pump casing, and the water accumulated inside the casing is rotated to create a vacuum, allowing the pump to suck in water. Vertical self-priming pumps generally use a full water channel structure in which water channels are provided around the entire periphery of the motor casing (see Patent Document 1, etc.).

[0003] The full waterway structure has a double casing and can store sufficient priming water between the inner and outer casings, making it suitable for self-priming pumps. However, because the casing has a double structure, it tends to be larger and heavier.

[0004] On the other hand, a single-channel structure is known as a submersible pump, which can be made smaller and lighter than a full-channel structure (Patent Documents 2 and 3, etc.). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 6-58190 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-25367 [Patent Document 3] Japanese Utility Model Application Publication No. 60-32588 Summary of the Invention [Problem to be solved by the invention]

[0006] However, due to its structure, the conventional single-channel structure does not have the capacity to store sufficient priming water like the full-channel structure, so while it can be used as a submersible pump that does not require priming water injection, it has the problem of lacking self-priming ability when used as a self-priming pump that requires sufficient priming water.

[0007] In order to solve the above problems, the main object of the present invention is to provide a single-channel vertical self-priming pump that employs a single-channel design that allows for miniaturization and weight reduction, while still having self-priming performance that is comparable to that of a full-channel self-priming pump. [Means for solving the problem]

[0008] In order to achieve the above-mentioned object, one embodiment of the present invention provides a single-channel vertical self-priming pump comprising a motor chamber accommodating a motor having a motor shaft, an impeller fixed to the motor shaft protruding from the motor chamber, a pump chamber accommodating the impeller, a single-channel communicating with the pump chamber and attached to the outer periphery of the motor chamber, and a gas-liquid separation plate extending from the pump chamber into the single-channel to a predetermined height and dividing the single-channel into a discharge side and a return side that returns the water to the pump chamber.

[0009] The gas-liquid separation plate may include a lower separation plate provided in the pump chamber, and an upper separation plate placed on the lower separation plate and disposed in the one water passage.

[0010] The upper separation plate may be formed in a cylindrical body fitted into the single water channel.

[0011] The impeller may further include a plurality of guide vanes around the periphery thereof, and the gas-liquid separation plate may be configured to block at least one of a plurality of flow paths formed between adjacent guide vanes.

[0012] The pump may further include an air reservoir chamber in an upper portion of the pump chamber, the air reservoir chamber communicating with the pump chamber and the discharge side of the single water passage.

[0013] The pump may further include a water storage chamber provided below the pump chamber and communicating with the pump chamber, and a suction flow path extending from an intake port having a hose connection portion through the outer bottom surface of the water storage chamber to the center of the impeller, so that the water storage chamber and the suction flow path are connected to each other.

[0014] The impeller may further include a suction passage that extends from a suction port to a center of the impeller, and the suction passage may be configured to communicate with the discharge side of the single water passage.

[0015] The pump casing may have a motor casing having the motor chamber therein, and a pump casing fixed to the motor casing and having the pump chamber, and the pump casing may have an air reservoir chamber above the pump chamber that is connected to the pump chamber and the discharge side of the single water passage.

[0016] The pump casing may include a casing body and a casing cover that is fixed to cover the casing body, and the air reservoir may be formed in a recess in the casing cover.

[0017] The pump casing may have a motor casing having the motor chamber therein, and a pump casing fixed to the motor casing and having the pump chamber, wherein the pump casing further comprises a water storage chamber provided below the pump chamber and communicating with the pump chamber, and a suction flow path extending from an intake port having a hose connection portion through the outer bottom surface of the water storage chamber to the center of the impeller, and the water storage chamber and the suction flow path are connected to each other. [Effects of the Invention]

[0018] By adopting the above-mentioned configuration, the present invention causes the water mixed with air that has left the impeller in the pump chamber to collide with the gas-liquid separator plate, and the impact of the collision separates the water from the air. Because the air is light, it passes over the gas-liquid separator plate and flows upward through the single water passage partitioned by the gas-liquid separator plate before being discharged, while because the water is heavy, it passes over the gas-liquid separator plate and returns to the pump chamber, thereby efficiently separating the air from the water in the pump chamber and improving the self-priming capacity. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a front view showing a first embodiment of a single-channel vertical self-priming pump according to the present invention. FIG. [Figure 2] FIG. 2 is a plan view of the single-channel vertical self-priming pump of FIG. [Figure 3] FIG. 3 is a side view of the single-channel vertical self-priming pump of FIG. [Figure 4] FIG. 4 is a bottom view of the single-channel vertical self-priming pump of FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line BB in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line CC in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line DD in FIG. [Figure 9] FIG. 9 is an exploded perspective view of the single-channel vertical self-priming pump of FIG. 1 as viewed obliquely from above. [Figure 10] FIG. 10 is an exploded perspective view of the single-channel vertical self-priming pump of FIG. 1 as viewed obliquely from below. [Figure 11] FIG. 11 is an enlarged perspective view of the cylinder shown in FIG. [Figure 12] FIG. 12 is a perspective view showing a cross section taken along line AA in FIG. [Figure 13] FIG. 13 is a perspective view showing a cross section taken along line BB in FIG. [Figure 14] FIG. 14 is a front view showing a second embodiment of a single-channel vertical self-priming pump according to the present invention. [Figure 15] FIG. 15 is a cross-sectional view taken along the line EE of FIG. [Figure 16] FIG. 16 is a cross-sectional view taken along the line FF in FIG. [Figure 17] 17 is a perspective view showing a part of the single-channel vertical self-priming pump of FIG. 14. FIG. [Figure 18] FIG. 18 is a perspective view showing a cross section taken along line GG in FIG. [Figure 19]FIG. 19 is an exploded perspective view of the single-channel vertical self-priming pump of FIG. 14 as viewed obliquely from above. [Figure 20] FIG. 20 is an exploded perspective view of the single-channel vertical self-priming pump of FIG. 14 as viewed obliquely from below. DETAILED DESCRIPTION OF THE INVENTION

[0020] An embodiment of a single-channel vertical self-priming pump according to the present invention will be described below with reference to Figures 1 to 20. Note that the same or similar components are designated by the same reference numerals throughout all the figures and all the embodiments, including those of the prior art.

[0021] A first embodiment of a single-channel vertical self-priming pump will be described with reference to Figures 1 to 13. Figure 1 is a front view, Figure 2 is a plan view, Figure 3 is a side view, Figure 4 is a bottom view, Figure 5 is a cross-sectional view taken along line AA in Figure 2, Figure 6 is a cross-sectional view taken along line BB in Figure 2, Figure 7 is a cross-sectional view taken along line CC in Figure 6, Figure 8 is a cross-sectional view taken along line DD in Figure 6, Figure 9 is an exploded perspective view seen from diagonally above, Figure 10 is an exploded perspective view seen from diagonally below, Figure 11 is an enlarged perspective view of one part, Figure 12 is a perspective view showing the cross-section taken along line AA in Figure 2, and Figure 13 is a perspective view showing the cross-section taken along line BB in Figure 2.

[0022] 5, 6, 12 and 13, the single-channel vertical self-priming pump 1 comprises a motor chamber 4 accommodating a motor 3 having a motor shaft 2, an impeller 5 fixed to the motor shaft 2 protruding from the motor chamber 4, a pump chamber 6 connected to the motor chamber 4 and accommodating the impeller 5, a single-channel 7 communicating with the inside of the pump chamber 6 and attached to the outer periphery of the motor chamber 4, and a gas-liquid separation plate 8 extending from the inside of the pump chamber 6 into the single-channel 7 to a predetermined height and dividing the inside of the single-channel 7 into a discharge-side flow path 7a and a return-side flow path 7b that returns the water to the inside of the pump chamber 6.

[0023] The motor chamber 4 is formed inside the motor casing 9. The single water passage 7 is formed integrally with the motor casing 9. The motor casing 9 is divided into upper and lower parts. A water inlet 10 through which priming water can be supplied is provided at the upper end of the single water passage 7, and an outlet 11 for connecting a hose protrudes from the upper side of the single water passage 7. The water inlet 10 is blocked by a plug (not shown) when the pump is operating, and the plug is removed when priming water is supplied (the plug is shown removed).

[0024] A pump casing 12 is fixed to the lower part of the motor casing 9. The pump casing 12 includes a casing body 12a and a casing cover 12b that is fixed to cover the casing body 12a.

[0025] The pump casing 12 contains, from top to bottom, an air chamber 13, a pump chamber 6, and a water chamber 14. The air chamber 13 and the pump chamber 6 are separated by a base plate 15. A guide vane 16 protrudes from the underside of the base plate 15. The pump chamber 6 and the water chamber 14 are separated by a partition plate 17.

[0026] 9 and 10, the casing cover 12b has a shaft hole 12c formed in the center, through which the motor shaft 2 passes, an annular raised portion 18 formed around the shaft hole 12c, and a recess 20 formed between the raised portion 18 and a peripheral edge portion 19. Referring to FIG. 5, the recess 20 is closed by a substrate 15, and the air reservoir chamber 13 is formed between the recess 20 and the substrate 15. Referring to FIGS. 9 and 10, the casing cover 12b has an opening 22 formed in a partial area of ​​the recess 20 of the air reservoir chamber 13, which connects the inside of the one water passage 7 and the inside of the pump chamber 6.

[0027] 7, 9, and 10, the base plate 15 has a circular opening 15a formed in the center for inserting the impeller 5, and guide vanes 16 are provided around the circular opening 15a to protrude downward. The guide vanes 16 extend radially from the periphery of the impeller 5 to the inner circumferential surface of the pump casing 12, and are formed in a spiral shape, with adjacent guide vanes 16 forming flow paths 23 that guide liquid radially outward from the pump chamber 6. The radially outer ends of the radially extending guide vanes 16 extend to the inner circumferential surface of the pump casing 12. 7, 8, and 10, the base plate 15 has openings 15c (FIGS. 5 and 8) and 15d (FIG. 10) that connect the single water passage 7 to two flow paths 23 arranged on both sides of the gas-liquid separation plate.

[0028] 8 to 10, a notch 15b is formed in the peripheral edge of the substrate 15. The air chamber 13 and the pump chamber 6 communicate with each other via the notch 15b. The notch 15b is formed outside the guide vane 16, along the guide vane 16, so as to be located at the end of the flow path 23 formed by the guide vane 16, as shown in FIG.

[0029] The pump chamber 6 is formed between the base plate 15 and the partition plate 17 inside the pump casing 12. The partition plate 17 has a suction hole 17a formed in its center, and the center of the impeller 5 is located above the suction hole 17a. The lower end of the motor shaft 2 protrudes into the suction hole 17a. The upper surface of the partition plate 17 has a spiral groove 17b (Figure 9) formed therein, into which the lower ends of the guide vanes 16 fit. The suction hole 17a communicates with the suction flow passage 24. The suction flow passage 24 runs from the suction hole 17a through the outer bottom surface of the pump casing 12 and communicates with a suction port 25 located on the side of the pump casing 12. The suction port 25 is equipped with a hose connection portion 25a.

[0030] Legs 17c (Fig. 10) protrude from the underside of partition plate 17. These legs 17c define water storage chamber 14 between the bottom surface of pump casing 12 and partition plate 17. Partition plate 17 is formed with first return ports 17d that communicate between pump chamber 6 and water storage chamber 14. One first return port 17d is provided at the end of each flow path 23. In addition, a second return port 26 (Fig. 6) that communicates between water storage chamber 14 and suction flow path 24 is formed in the bottom of water storage chamber 14, i.e., the bottom of pump casing 12.

[0031] The gas-liquid separation plate 8 includes a lower separation plate 8a provided within the pump chamber 6 and an upper separation plate 8b extending into the single water passage 7. Referring to Figures 7 and 10, the lower separation plate 8a is provided integrally by connecting adjacent guide vanes 16 so as to block a flow path 23 formed by the pair of guide vanes 16. In the illustrated example, the lower separation plate 8a is formed so as to block one flow path 23, but depending on the number and spacing of the guide vanes, it can also be provided so as to block a plurality of adjacent flow paths 23.

[0032] The upper separation plate 8b is placed on top of the lower separation plate 8a and is connected to the lower separation plate 8a. As shown in Figure 11, the upper separation plate 8b in the illustrated example is integrally provided within a cylindrical body 21 that is fitted into the single water passage 7, and the upper separation plate 8b divides the interior of the cylindrical body 21 into two flow paths 7a and 7b. Flow path 7a is the discharge side where the flowing fluid faces the discharge port 11 at the top of the single water passage 7, and flow path 7b is the return side where the flowing fluid returns to the pump chamber 6. The gas-liquid separation plate is not limited to the illustrated example, and for example, the upper separation plate and the lower separation plate can be formed integrally, or the upper separation plate can be formed integrally within the single water passage.

[0033] Referring to Figures 10 and 11, the return-side flow path 7b of the cylindrical body 21 is longer than the discharge-side flow path 7a. Referring to Figure 9, an opening 15c of the substrate 15 opens directly below the discharge-side flow path 7a via a gap. As a result, referring to Figures 5 and 7 to 10, a communication passage 7a1 is formed in the discharge-side flow path 7a of the cylindrical body 21, communicating with the air reservoir chamber 13 above the substrate 15. The discharge-side flow path 7a communicates with the flow path 23 of the pump chamber 6 below the substrate 15 through the opening 15c of the substrate 15 via the communication passage 7a1 leading to the air reservoir chamber 13.

[0034] On the other hand, the return flow path 7b directly communicates with the opening 15d of the substrate 15. As a result, the return flow path 7b is configured to communicate with the flow path 23 of the pump chamber 6 without communicating with the air reservoir chamber 13.

[0035] Furthermore, by providing the upper separation plate 8b on a cylindrical body 21 that fits into the single waterway 7 as in the illustrated example, the motor casing can be used without any design changes from a conventional single waterway type submersible pump, and the cylindrical body 21 can be retrofitted to a conventional motor casing 9.

[0036] In the single-channel vertical self-priming pump 1 having the above configuration, hoses H1 (Fig. 1) and H2 (Fig. 3) are connected to the suction port 25 and the discharge port 11 of the single channel 7, respectively, and the end of the hose H1 connected to the suction port 25 is submerged in water such as accumulated water (not shown). Before the pump is operated, priming water is poured into the water inlet 10. After pouring water, the water inlet 10 is sealed with a plug. The priming water poured into the water inlet 10 flows into the pump chamber 6, the water storage chamber 14, and the suction flow path 24, which are connected by the first return port 17d and the second return port 26.

[0037] By providing a water storage chamber 14 communicating with the pump chamber 6 below the pump chamber 6, the amount of priming water that can be injected can be increased. By configuring the pump casing 12 so that the water storage chamber 14 is added below the pump chamber 6, the motor casing of a conventional single-channel vertical submersible pump can be used as is without modification, and by replacing the pump casing with the pump casing 12 of the present invention, a single-channel vertical self-priming pump with an increased water storage capacity can be created. In particular, because changing the motor increases costs, costs can be reduced by using the motor casing of a conventional single-channel submersible pump as is and modifying the pump casing to create a single-channel vertical self-priming pump with an increased water storage capacity.

[0038] When the impeller 5 is driven to rotate, negative pressure is generated on the side of the suction hole 17a of the impeller 5 inside the pump casing, and the water in the suction flow path 24 is sucked in, which in turn sucks in the air in the hose H1. The air sucked into the suction flow path 24 from the hose H1 is mixed with the water in the suction flow path 24 and agitated by the impeller 5 to become a water-air mixed fluid M (FIG. 7), which is sent out from the impeller 5 to the flow path 23 formed by the guide vanes 16.

[0039] The mixed fluid M sent to the guide vanes 16 has some of the air separated in the flow passages 23 formed by the guide vanes 16, and the gas-liquid separator 8 further separates some of the air.

[0040] 5, 7, and 8, air A1 separated from mixed fluid M in flow path 23 passes through notch 15b in substrate 15 and enters air reservoir chamber 13. Without air reservoir chamber 13, the air separated from the mixed fluid would accumulate in flow path 23, which could reduce the pump discharge capacity, but this can be prevented by providing air reservoir chamber 13. Air A1 that has entered air reservoir chamber 13 travels through communicating passage 7a1 to rejoin the mixed fluid M that enters flow path 7a on the discharge side of single water passage 7 from flow path 23 of pump chamber 6, and is separated by gas-liquid separation plate 8 (upper separation plate 8b).

[0041] The liquid W (Figure 6) separated from the air in the flow path 23 that does not have the lower separation plate 8a enters the water storage chamber 14 through the first reflux port 17d of the partition plate 17, then enters the suction flow path 24 through the second reflux port 26, and returns to the pump chamber 6 again.

[0042] The mixed fluid M (FIG. 12) that collides with the gas-liquid separation plate 8 in the flow path 23 blocked by the lower separation plate 8a is separated into gas A and liquid W by the collision and rises along the gas-liquid separation plate 8 in the discharge-side flow path 7a of the single water passage 7, entraining air A1 in the air reservoir chamber 13. The air continues to rise in the single water passage 7 and is discharged from the discharge port 11. Meanwhile, the water that is separated from the gas-liquid mixed fluid upon collision with the gas-liquid separation plate 8 passes over the gas-liquid separation plate 8, falls through the return-side flow path 7b, returns to the pump chamber 6, and further flows into the water storage chamber 14 through the first return port 17d. From the water storage chamber 14, it passes through the second return port 26 to enter the suction flow path 24 and is sucked into the pump chamber 6 from the suction flow path 24 by the impeller 5. In this way, the air is separated from the water that has entrained the air and is discharged from the discharge port 11 as it circulates repeatedly.

[0043] Next, a second embodiment of a single-channel vertical self-priming pump will be described with reference to Figures 14 to 20. Figure 14 is a front view, Figure 15 is an E-E cross-sectional view of Figure 14, Figure 16 is an F-F cross-sectional view of Figure 14, Figure 17 is a partially see-through perspective view, Figure 18 is a G-G cross-sectional view of Figure 14, Figure 19 is an exploded perspective view as viewed obliquely from above, and Figure 20 is an exploded perspective view as viewed obliquely from below. Note that components that are the same as or similar to those in the first embodiment are designated by the same reference numerals.

[0044] The single-channel vertical self-priming pump 1A of the second embodiment does not have an air reservoir or a liquid storage chamber as in the first embodiment. Also, while the single-channel vertical self-priming pump 1 of the first embodiment is a turbine type equipped with guide vanes as stationary vanes, the single-channel vertical self-priming pump 1A of the second embodiment is a volute type equipped with no guide vanes.

[0045] The pump casing 12, fixed to the bottom of the motor casing 9, includes a pump chamber 6 that houses the impeller 5. A suction passage 24 is formed at the bottom of the pump chamber 6. A passage 27 (FIG. 16) is formed in the pump chamber 6, running approximately halfway around the impeller 5 and directing the fluid discharged from the impeller 5 to the single water passage 7. The passage 27 is narrow on the inlet side and wide on the outlet side, forming a so-called volute. The outlet side of the passage 27 leading to the impeller 5 is blocked by a lower separation plate 8a (FIGS. 16 and 18) of the gas-liquid separation plate 8 at the bottom of the single water passage 7. The upper separation plate 8b, placed on the lower separation plate 8a, is formed in a cylindrical body 21A fitted into the single water passage 7 and extends to a predetermined height above the single water passage 7. The gas-liquid separation plate 8 is composed of the lower separation plate 8a and the upper separation plate 8b. The cylindrical body 21A is divided by an upper separation plate 8b into a discharge-side flow path 7a and a return-side flow path 7b. In the second embodiment, unlike the first embodiment, no air reservoir chamber is provided above the pump chamber 6, and therefore the flow paths 7a and 7b are set to have the same length.

[0046] 16, the flow path 27 is formed in a region that circulates approximately halfway around the impeller 5 within the pump chamber 6, and the opposite side of the impeller 5 from the flow path 27 is a hollow portion 6a of the pump chamber 6 that is formed by the pump casing 12. A return port 26A (FIGS. 16 and 19) that communicates with the suction flow path 24 is formed at the bottom of the hollow portion 6a.

[0047] The lower end of the single water passage 7 opens to both the flow passage 27 and the hollow portion 6a, and an upper separation plate 8b separates the lower portion of the single water passage 7 into a discharge-side flow passage 7a and a return-side flow passage 7b, with the return-side flow passage 7b communicating with the hollow portion 6a in the pump chamber 6. Water that enters the return-side flow passage 7b passes from the hollow portion 6a through the return port 26A and is returned to the suction flow passage 24 again.

[0048] In the single-channel vertical self-priming pump 1A according to the second embodiment, when priming water is injected into the water inlet 10 and the impeller 5 is driven, air remaining in the hose (not shown) connected to the hose connector 25a is sucked into the suction passage 24 through the suction port 25. The air sucked into the suction passage 24 mixes with the water in the suction passage 24, and the resulting mixed fluid is sucked into the impeller 5, flows through the passage 27 forming the volute chamber, and collides with the gas-liquid separator plate 8. The mixed fluid M (FIG. 18) is separated into gas A and liquid W upon colliding with the gas-liquid separator plate 8. The separated gas A rises through the discharge-side passage 7a of the single channel 7 and is discharged to the outside through the discharge port 11. The separated liquid W passes over the gas-liquid separator plate 8, passes through the return-side passage 7b, passes through the cavity 6a, and passes through the return port 26 to be sucked back into the suction passage 24 and returned to the pump chamber 6.

[0049] According to the single-channel vertical self-priming pumps of the first and second embodiments, even though they have only one channel, gas can be efficiently separated from the mixed fluid, and they can have self-priming performance that is comparable to that of a full-channel self-priming pump.

[0050] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, an embodiment may be made that does not include the air chamber of the first embodiment, or an embodiment may be made that does not include a liquid chamber. [Explanation of symbols]

[0051] 1, 1A Single channel vertical self-priming pump 2 motor shaft 3 motors 4 Motor room 5 impeller 6. Pump Room 7 Single channel 8 Gas-liquid separation plate 8a Lower separation plate 8b Upper separation plate 9 Motor casing 11 Discharge port 12 Pump casing 13 Air chamber 14 Water Storage Room 15 PCB 16 Guide vanes 17 Divider 24 Suction passage 25 Intake port 27 Flow path

Claims

1. a motor chamber containing a motor having a motor shaft; an impeller fixed to the motor shaft protruding from the motor chamber; a pump chamber that houses the impeller; A single waterway communicating with the pump chamber and attached to the outer periphery of the motor chamber; a gas-liquid separation plate that extends from the pump chamber into the one water passage to a predetermined height and divides the one water passage into a discharge side and a return side that returns the water to the pump chamber; A single-channel vertical self-priming pump equipped with:

2. 2. The single-channel vertical self-priming pump according to claim 1, wherein the gas-liquid separation plate comprises a lower separation plate provided in the pump chamber and an upper separation plate placed on the lower separation plate and disposed in the single channel.

3. 3. The single-channel vertical self-priming pump according to claim 2, wherein the upper separation plate is formed within a cylindrical body fitted into the single channel.

4. Further comprising a plurality of guide vanes around the impeller; The gas-liquid separation plate is configured to block at least one of a plurality of flow paths formed between adjacent guide vanes.

2. The single-channel vertical self-priming pump according to claim 1.

5. An air reservoir chamber is further provided above the pump chamber, the air reservoir chamber communicating with the pump chamber and the discharge side of the single water passage.

2. The single-channel vertical self-priming pump according to claim 1.

6. a water storage chamber provided below the pump chamber and communicating with the pump chamber; a suction flow path extending from a suction port having a hose connection portion through an outer bottom surface of the water storage chamber to a center of the impeller; The water storage chamber and the suction flow path are in communication with each other.

2. The single-channel vertical self-priming pump according to claim 1.

7. The impeller further includes a suction passage that extends from the suction port to the center of the impeller, The suction flow path communicates with the discharge side of the single water passage.

2. The single-channel vertical self-priming pump according to claim 1.

8. a motor casing having the motor chamber therein; a pump casing fixed to the motor casing and having the pump chamber; The pump casing has an air reservoir chamber in an upper portion of the pump chamber, the air reservoir chamber communicating with the pump chamber and the discharge side of the single water passage.

2. The single-channel vertical self-priming pump according to claim 1.

9. The pump casing includes a casing body and a casing cover that is fixed to cover the casing body, The air chamber is formed in a recess of the casing cover.

9. The single-channel vertical self-priming pump according to claim 8.

10. a motor casing having the motor chamber therein; a pump casing fixed to the motor casing and having the pump chamber; The pump casing comprises: a water storage chamber provided below the pump chamber and communicating with the pump chamber; a suction flow path extending from a suction port having a hose connection portion through an outer bottom surface of the water storage chamber to a center of the impeller; The water storage chamber and the suction flow path are in communication with each other.

2. The single-channel vertical self-priming pump according to claim 1.

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