Ejector pump

Abstract

To provide an ejector pump capable of efficiently sucking a deposit such as sediment accumulated on a bottom of rivers, purification plants and the like, with a simple constitution.SOLUTION: The ejector pump according to the present invention has: a compression pump for pressurizing and supplying fluid; and a suction device for receiving high-pressure fluid pressurized by the compression pump and generating a suction reaction. The suction device includes: plural injection nozzles for injecting the high-pressure fluid; a coupling member generating negative pressure for suction by injecting the high-pressure fluid from the injection nozzles; a suction pipe for sucking a conveyance material with the negative pressure for suction generated by the coupling member; and a discharge pipe for discharging the conveyance material sucked by the coupling member via the suction pipe to outside of the coupling member. The injection nozzle has: a coupling part connected to the other end of a fluidizing pipeline connected to the compression pump; and an injection part coupled with the coupling part, and provided in a manner that a tip part is inserted in the coupling member. The injection parts of the plural injection nozzles are provided in contact with each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an ejector pump for removing sediment deposited in a river or the like. [Background technology]

[0002] In rivers, dam lakes, water purification plants, and other water systems, sediment accumulation at the bottom of the water reduces the system's ability to perform its intended functions, making it necessary to remove the accumulated sediment. Patent Document 1, for example, discloses a dredging system using an ejector pump, which continuously and efficiently removes sediment from the bottom of the water. This dredging system includes a high-pressure pump, an ejector device, a suction pipe, a fluid injection device, and a sand discharge pipe. The ejector is driven together with the fluid injection device to mix the sediment at the bottom with the fluid injected by the fluid injection device, which is then sucked into the ejector through the suction pipe and pumped to the sand discharge pipe. The ejector pump used in such dredging work utilizes negative pressure generated within the ejector by the jet of water to suck and transport the sediment. Compared to sand pumps, this system has the advantages of being more durable due to the lack of impeller wear and less likely to clog the flow path.

[0003] Furthermore, Patent Document 2 discloses a configuration in which an ejector pump performs suction and transport by utilizing negative pressure caused by jet water sprayed from a spray nozzle connected to an ejector, and by providing multiple spray nozzles, the amount of water injected into the ejector is adjusted and the degree of vacuum inside the ejector is increased by the jet water, thereby improving transport capacity. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-53437 [Patent Document 2] Japanese Patent Application Publication No. 62-272000 Summary of the Invention [Problem to be solved by the invention]

[0005] According to the configuration disclosed in Patent Document 2, multiple injection nozzles are provided upstream of the flow path, and the direction of the fluid ejected from the injection nozzles is converged at a convergence point set on the axis of the sand discharge pipe that discharges the sand to the outside, resulting in a complex device configuration, such as aligning the direction of the high-pressure fluid ejected from the injection nozzles. Furthermore, with conventional ejector pumps, the fluids ejected from the injection nozzles are converged at a convergence point, which can cause interference between the fluids ejected from the injection nozzles, hindering the flow of liquid that has entered the sand discharge pipe, causing sand to accumulate in the sand discharge pipe and block the flow path, or narrowing the flow path, making it impossible to carry out dredging work.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide an ejector pump that is simply configured and can efficiently suck up sediments such as earth and sand that have accumulated on the bottom of rivers, water purification plants, etc. [Means for solving the problem]

[0007] The ejector pump according to the present invention comprises a pressure pump that pressurizes and supplies fluid, and a suction device that receives the high-pressure fluid pressurized by the pressure pump and generates a suction action, the suction device including a plurality of injection nozzles that inject the high-pressure fluid supplied from the pressure pump, a connecting member in which a negative suction pressure is generated when the high-pressure fluid is sprayed from the injection nozzle, a suction pipe that sucks the transported object by the negative suction pressure generated in the connecting member, and a discharge pipe that discharges the transported object sucked into the connecting member via the suction pipe to the outside of the connecting member, the plurality of injection nozzles being connected to flow piping so that each injection nozzle has an independent flow path, and each injection nozzle has a connecting part connected to the other end of the flow piping, and an injection part connected to the connecting part and having its tip inserted into the connecting member, the injection parts of the plurality of injection nozzles being arranged so as to be in contact with each other.

[0008] In another aspect of the ejector pump of the present invention, the suction pipe is connected to the connecting member in a direction perpendicular to the injection portions of the multiple injection nozzles and the discharge pipe, and the tip of the injection portion extends to the rear peripheral edge of the suction pipe.

[0009] In another aspect of the ejector pump of the present invention, the connecting member has an inlet portion into which high-pressure fluid pressurized by the pressure pump flows, a discharge portion provided opposite the inlet portion, and a suction portion provided perpendicular to the inlet portion and the discharge portion, and the injection tip portion of the injection nozzle is disposed approximately in the center of the inlet portion. [Effects of the Invention]

[0010] The ejector pump according to the present invention comprises a pressure pump that pressurizes and supplies fluid, and a suction device that receives the high-pressure fluid pressurized by the pressure pump and generates a suction action. The suction device includes a plurality of injection nozzles that inject the high-pressure fluid supplied from the pressure pump, a connecting member in which a negative suction pressure is generated when the high-pressure fluid is injected from the injection nozzle, a suction pipe that sucks the transported material by the negative suction pressure generated in the connecting member, and a discharge pipe that discharges the transported material sucked into the connecting member via the suction pipe to the outside of the connecting member. The plurality of injection nozzles are connected to flow pipes on the pressure pump so that each injection nozzle has an independent flow path, and each injection nozzle has a connecting part that is connected to the other end of the flow pipe, and a jet part that is connected to the connecting part and has its tip inserted into the connecting member. By arranging the injection parts of the plurality of injection nozzles so that they are in contact with each other, the high-pressure fluids ejected from the injection parts are less likely to interfere with each other, and the flow of the high-pressure fluid is not obstructed. This improves the vacuum within the connecting member and enables dredging work to be performed efficiently using the suction pipe. In addition, because the high-pressure fluids sprayed from the spray parts are less likely to interfere with each other, the liquid flows smoothly through the discharge pipe, the vacuum created in the connecting member can be maintained, and dredging work can be performed efficiently. Also, by connecting flow pipes to each spray nozzle so that the flows of high-pressure fluid flowing into the spray nozzles are independent, the flow rate of the high-pressure fluid flowing through the flow pipes is approximately the same as the flow rate set by the pressure pump, and the flow rate of high-pressure fluid sprayed from the spray nozzles into the connecting member can be secured, making dredging work using the ejector pump more efficient.

[0011] In another aspect of the ejector pump of the present invention, the suction pipe is connected to the connecting member in a direction perpendicular to the multiple injection nozzles and the discharge pipe, and the tip of the injection portion of the injection nozzle extends to the rear peripheral edge of the suction pipe, so that the injection portion of the high-pressure fluid, which produces the highest vacuum, can be located near the center of the connecting member. By sending the material sucked into the suction pipe through the center of the connecting member to the discharge pipe, the material can be discharged without getting caught on the edges of the various pipes connected to the connecting member. Furthermore, by positioning the tip of the injection nozzle close to the base end of the discharge pipe, the high-pressure fluid ejected from the injection nozzle can reach the discharge pipe while maintaining a high pressure, preventing material that has entered the discharge pipe from becoming trapped within the discharge pipe. In other words, material that has entered the discharge pipe is pressed in the direction of fluid flow by the high-pressure fluid ejected from the injection nozzle, and is pushed out of the discharge pipe without becoming trapped within the discharge pipe.

[0012] In another aspect of the ejector pump of the present invention, the connecting member has an inlet portion into which high-pressure fluid pressurized by the pressure pump flows, a discharge portion provided facing the inlet portion, and a suction portion provided perpendicular to the inlet and discharge portions, and the injection tip of the injection nozzle is disposed approximately in the center of the inlet portion, so that the degree of vacuum in the center of the connecting member is at its maximum and decreases with increasing distance from the center of the connecting member, and therefore the transported object is gathered toward the center of the connecting member and can be transported to the base end of the discharge pipe without becoming stuck in corners or the like within the connecting member. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing the overall configuration of an ejector pump according to an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing an injection nozzle of an ejector pump according to an embodiment of the present invention. [Figure 3] 1 is a diagram showing a suction device of an ejector pump according to an embodiment of the present invention; [Figure 4] FIG. 4 is an end view taken along line AA in FIG. 3. [Figure 5]FIG. 4 is a diagram showing a flow path within a connecting member according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention is an ejector pump 1 for dredging sediment deposited on the bottom of a river or the like using high-pressure fluid supplied under pressure by a pressure pump 2, and by devising the shape and installation manner of the injection nozzle 4 connected to the connecting member 5, it is possible to circulate the high-pressure fluid at a flow rate set by the pressure pump 2 up to the connecting member 5, and by ensuring the flow rate of the high-pressure fluid injected into the connecting member 5, it is possible to improve the degree of vacuum created within the connecting member 5, thereby increasing the amount of sediment that can be sucked into the suction pipe 6 and enabling efficient dredging work. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0015] The configuration of an ejector pump 1 according to this embodiment will be described with reference to Figs. 1 to 5. Fig. 1 is a diagram showing an example of how the ejector pump 1 is used. Fig. 2 is a diagram showing the configuration of an injection nozzle 4, and Fig. 3 is a diagram showing the configuration of a suction device 3. Fig. 4 is an end view taken along line AA in Fig. 3, showing the insertion position of the injection nozzle 4 inserted into a connecting member 5. Fig. 5 is a diagram showing a fluid flow path within the connecting member 5.

[0016] As shown in FIG. 1, the ejector pump 1 has a pressure pump 2 that pressurizes and supplies fluid, and a suction device 3 that receives the high-pressure fluid pressurized by the pressure pump 2 and generates a dredging action.

[0017] The booster pump 2 is installed between a settling basin or a river at a water purification plant and the suction device 3, and is connected to the suction device 3 via a flow pipe P. The booster pump 2 pressurizes water W drawn up from a river or the like to produce a high-pressure fluid, which is then supplied to the suction device 3 via the flow pipe P. The flow pipe P has a base end connected to the discharge port of the booster pump 2 and a tip end connected to a spray nozzle 4. The flow pipe P has a substantially constant or fixed flow path diameter C throughout. A flow rate measuring device is installed midway through the flow pipe P. The flow rate measuring device measures the flow rate of the water W flowing through the flow pipe P, and the water delivery performance of the booster pump 2 can be confirmed by comparing the flow rate with the rotation speed of the impeller in the booster pump 2. In this embodiment, the booster pump 2 has two discharge ports, each connected to a flow pipe P, and the tip of each flow pipe P is connected to a spray nozzle 4. However, there is no limit to the number of pressure pumps 2 that can be installed as long as they can spray a predetermined amount of liquid from the tip of the injection nozzle 4, and one pressure pump 2 may be configured to be connected to one injection nozzle 4 via a flow piping P.

[0018] As shown in Figure 1, the suction device 3 has a plurality of injection nozzles 4 that inject high-pressure fluid supplied from the pressure pump 2 via the flow piping P, a connecting member 5 in which a negative suction pressure is generated when the high-pressure fluid is injected from the injection nozzles 4, a suction pipe 6 that sucks sediments such as soil and sand that have accumulated on the bottom of a river or the like into the connecting member 5 by the negative suction pressure generated in the connecting member 5, and a discharge pipe 7 that discharges the transported material such as soil and sand sucked into the connecting member 5 via the suction pipe 6 to the outside of the connecting member 5.

[0019] The jet nozzle 4 is provided on the other side of the connecting member 5 in the direction of the axis C1 (left side in FIG. 1) as a portion that receives connection to one end of the flow pipe P. Here, the direction of the axis C1 is the axial direction of the connecting member 5 that indicates the flow path direction of the fluid circulating within the connecting member 5, and is the left-right direction in FIG. 1. The jet nozzle 4 is a portion that sends the high-pressure fluid delivered from the pressure pump 2 to the connecting member 5 in an appropriate flow direction and flow rate without impeding the flow. In the suction device 3, one jet nozzle 4 and the other jet nozzle 4 are provided line-symmetrically about the axis C1. As shown in FIG. 2, the jet nozzle 4 has a connecting portion 41 and a jet portion 42.

[0020] The connecting portion 41 has a cylindrical connecting portion main body 41a with a hollow interior, and a connecting portion internal flow path 41b through which water supplied from the flow pipe P flows. The connecting portion main body 41a has, as end faces on both sides in the direction of the axis C2, an upstream end face 41c and a downstream end face 41d, both of which are faces perpendicular to the axis C2. The connecting portion internal flow path 41b is formed as a flow path with a substantially circular or circular cross section by the cylindrical inner peripheral surface of the connecting portion main body 41a, and opens at each of the upstream end face 41c and the downstream end face 41d. The connecting portion internal flow path 41b has a substantially constant or constant flow path diameter (inner diameter) C throughout the entire connecting portion 41, and is formed so that the flow path area is substantially constant or constant throughout the entire connecting portion 41. In the following description, in the ejector pump 1, with respect to the direction of the axis C2 of the connecting portion 41, one side in the direction of the fluid flow (the right side in Figure 1) will be referred to as the "downstream side", and the opposite side (the left side in Figure 1) will be referred to as the "upstream side".

[0021] One end of the flow piping P is connected to the upstream side of the connecting portion 41. A well-known connecting structure is used to connect the flow piping P to the connecting portion 41. For example, from the viewpoint of obtaining good workability, a structure using a plug-in type connecting fitting called a Machino type, which allows the flow piping P to be attached and detached relatively easily to the connecting portion 41, is used to connect the flow piping P to the connecting portion 41. Note that the connecting structure of the flow piping P to the connecting portion 41 is not particularly limited, and may be, for example, a structure using a screw-type connecting fitting.

[0022] A ring-shaped buffer 41e made of an elastic material such as rubber is attached to the outer periphery of the connecting body 41a near the upstream end face 41c. The buffer 41e is fitted into an outer periphery groove formed on the outer periphery of the upstream end of the connecting body 41a. By surrounding the outer periphery of the connecting body 41a with the buffer 41e, the members (metal fittings) that make up the connecting body 41a are protected from external impacts.

[0023] The downstream end of the connecting portion main body 41a has a flange portion 41g. The flange portion 41g is a disk-shaped, enlarged portion that extends radially outward from the downstream end of the connecting portion main body 41a, and is formed as a part of the connecting portion main body 41a. The flange portion 41g forms the downstream end face 41d of the connecting portion main body 41a.

[0024] The jetting portion 42 is connected via a flange portion 41g to the downstream side of the connecting portion 41 formed in this manner. The jetting portion 42 receives the high-pressure fluid flowing through the connecting portion inner flow path 41b of the connecting portion main body 41a, and jets the high-pressure fluid from its tip into the connecting member 5.

[0025] The jetting section 42 includes a jetting section main body 42a formed in a cylindrical shape with a hollow interior and an jetting section internal flow path 42b through which the high-pressure fluid supplied from the connecting section internal flow path 41b flows. In a cross-sectional view, the jetting section main body 42a has an axis C3 extending downstream from the axis C2 of the connecting section main body 41a and an axis C4 extending downstream of the axis C3 and perpendicular to the side surface of the connecting member 5. The jetting section main body 42a has an upstream end face 42c perpendicular to the axis C3 and a downstream end face 42d perpendicular to the axis C4. The jetting section internal flow path 42b is formed as a flow path with a substantially circular or circular cross section by the cylindrical inner circumferential surface of the jetting section main body 42a and opens at both the upstream end face 42c and the downstream end face 42d. The jetting section internal flow path 42b is configured so that the downstream flow path diameter is smaller than the upstream flow path diameter.

[0026] The jetting portion main body 42a is formed in a cylindrical shape with a hollow interior, and has an jetting portion internal flow path 42b therein through which the fluid supplied from the connecting portion internal flow path 41b of the connecting portion main body 41a flows. The jetting portion internal flow path 42b is formed into a substantially circular or circular cross section by the cylindrical inner circumferential surface of the jetting portion main body 42a, and is open to each of the upstream end face 42c and the downstream end face 42d.

[0027] The injection section internal flow path 42b has an upstream side flow path 42b1 that connects to the connecting section internal flow path 41b, a connecting flow path 42b2 that smoothly connects to the upstream side flow path 42b1, and a downstream side flow path 42b3 that smoothly connects to the downstream side of the connecting flow path 42b2.

[0028] The upstream flow path 42b1 has a substantially constant or fixed flow path diameter (inner diameter) throughout, and is formed so that the flow path area is substantially constant or fixed throughout the entire upstream flow path 42b1. The connecting flow path 42b2 is formed so that the upstream side of the flow path has substantially the same diameter as the upstream flow path 42b1, and is formed in a substantially funnel shape with the flow path diameter gradually decreasing toward the downstream side. In this embodiment, the flow path diameter on the downstream side of the connecting flow path 42b2 is configured to be approximately half the flow path diameter on the upstream side. However, the flow path diameter on the downstream side of the connecting flow path 42b2 may have any relationship as long as it is formed smaller than the flow path diameter on the upstream side.

[0029] The downstream flow path 42b3 has a flow path diameter substantially equal to the flow path diameter of the downstream end of the connecting flow path 42b2. The downstream flow path 42b3 has a bent portion 42e that smoothly connects to the connecting flow path 42b2 and changes the transport direction of the high-pressure fluid in the ejection part flow path 42b in a direction perpendicular to the side surface of the connecting member 5, and an ejection portion 42f that extends from the bent portion 42e in a direction in which the axis C4 is perpendicular to the side surface of the connecting member 5.

[0030] The bent portion 42e is a portion that changes the direction of the high-pressure fluid flowing through the connecting portion internal flow path 41b to a direction perpendicular to the side surface of the connecting member 5. In this embodiment, the angle α formed by the axis C3 of the connecting flow path 42b2 and the axis C4 of the jetting portion 42f is configured to be an obtuse angle. Note that the angle α may be set to any angle as long as it allows the fluid flowing through the connecting portion internal flow path 41b and the jetting portion internal flow path 42b to flow without peeling off from the inner circumferential surface of the jetting portion main body 42a that forms the jetting portion internal flow path 42b, and is set to, for example, 120 to 165 degrees. In this embodiment, the angle α is set to 150 degrees.

[0031] The ejection portion 42f has approximately the same flow path diameter as the bent portion 42e. The ejection portion 42f has approximately the same flow path diameter or has the same flow path diameter and is inserted into the connecting member 5 for approximately half of its entire length. The ejection portion 42f has a flange portion 43 on the outer circumferential side near the approximate center in the longitudinal direction. The flange portion 43 is a disk-shaped, enlarged portion that extends radially outward from the ejection portion main body 42a and is formed as a part of the ejection portion main body 42a. The ejection portion 42f has the flange portion 43 fixed to the nozzle-side flange portion 52 of the connecting member 5 via a fixing means. By fixing the flange portion 43 and the nozzle-side flange portion 52 in this manner, the ejection portion 42f is fixed to the connecting member 5 in a manner such that approximately half of its entire length is inserted into the connecting member 5. As shown in FIG. 3 , the tip of the ejection portion 42f extends to the vicinity of the left outer circumferential edge of the suction tube main body 61 (described later) when viewed from the front of the suction device 3. The left side in FIG. 3 refers to the upstream side in the flow direction of the high-pressure fluid sprayed from the spray unit 42. As shown in FIG. 4, the spray units 42f are arranged symmetrically about the axis C1 in the inlet unit 51a of the connecting member main body 51 (described later), with the axis C4 of the spray unit inner flow path 42b on a concentric circle centered on the axis C1 of the connecting member main body 51. In this embodiment, a straight line L connecting the axes C4 of the spray units 42f passes through the axis C1 and is arranged parallel to the conveyance direction (the direction indicated by the white arrow in FIG. 4) of the transported goods circulating through the transport / distribution passage 62 of the suction pipe 6. However, the spray units 42f may be arranged in any manner as long as the axis C4 of the spray units 42f is arranged on a concentric circle centered on the axis C1 of the connecting member main body 51 and the spray units 42f are arranged symmetrically about the axis C1. For example, the straight line L may be provided so as to be perpendicular to the conveying direction of the conveyed object, or the straight line L may be provided so as to be oblique to the conveying direction of the conveyed object. Furthermore, the axes C4 of the jetting portions 42f are located on concentric circles with the axis C1 as their center and having the same radius.

[0032] As shown in Figures 2 and 3, the injection nozzles 4 are arranged symmetrically with one injection nozzle 4 and the other injection nozzle 4 about the axis C1 of the connecting member 5, and are arranged so that their injection portions 42f are in contact with each other.

[0033] The injection nozzle 4 is configured in this manner, so that the high-pressure fluid that flows into the connecting portion 41 via the flow piping P is guided through the injection portion 42 to the inside of the connecting member 5 without stagnation. The injection nozzle 4 increases the flow rate of the high-pressure fluid by gradually reducing the flow path diameter through which the high-pressure fluid flows in the connecting flow path 42b2 until the high-pressure fluid delivered from the flow piping P is injected into the connecting member 5, and changes the flow direction of the high-pressure fluid in the downstream flow path 42b3 to a direction perpendicular to the side surface of the connecting member 5, so that the flow of the high-pressure fluid discharged from the pressure pump 2 is not obstructed as it flows through the injection nozzle 4. In other words, the flow rate of the high-pressure fluid ejected from the pressure pump 2 and the flow rate of the high-pressure fluid injected from the tip of the injection nozzle 4 into the connecting member 5 are substantially the same, allowing the pressure pump 2 to maximize its discharge performance of the high-pressure fluid, improving the degree of vacuum within the connecting member 5 and improving the dredging action of the suction pipe 6, which will be described later.

[0034] Furthermore, the injection nozzle 4 has a bent portion 42e that bends the fluid flowing therethrough from the direction of axis C3 to the direction of axis C4, thereby increasing the flow rate of the high-pressure fluid ejected from the tip of the injection portion main body 42a so that it is more likely to be ejected near the axis C1 of the connecting member 5. In other words, the high-pressure fluid ejected from the injection nozzle 4 flows along the axis C1 as it passes through the bent portion 42e, thereby increasing the amount of ejection near the axis C1. In this way, by increasing the flow rate of the high-pressure fluid passing near the axis C1 of the connecting member 5, the degree of vacuum in the center of the connecting member 5 is improved, making it easier for the transported object sucked through the suction pipe 6 to pass near the center of the connecting member 5, and the transported object can be sent to the discharge pipe 7 without stagnation within the connecting member 5.

[0035] Here, the principle behind the increase in the flow rate of the high-pressure fluid flowing through the injection nozzle 4 and passing near the axis C1 of the connecting member 5 when the high-pressure fluid is ejected from the ejection portion 42f will be described with reference to Fig. 5. The black arrows in Fig. 5 schematically show the movement of the flowing fluid.

[0036] As the high-pressure fluid passing through the injection portion 42 flows through the generally funnel-shaped connecting flow path 42b2, the high-pressure fluid flowing near the peripheral wall surface of the connecting flow path 42b2 increases in flow velocity, approaches the axis C3, and flows in a direction along the axis C3. Thereafter, the high-pressure fluid that flows into the bent portion 42e smoothly changes its flow direction to follow the bent outer periphery 42e1 of the bent portion 42e as it bends from the axis C3 to the axis C4, because the angle α between the axis C3 and the axis C4 is an obtuse angle. In this way, while the high-pressure fluid flows straight through the connecting flow path 42b2 along the axis C3, the density of the high-pressure fluid near the axis C1 increases when it bends toward the axis C4, because the angle α between the axis C3 and the axis C4 is an obtuse angle.

[0037] If the angle α between the axis C3 and the axis C4 approaches an acute angle, the high-pressure fluid passing through the bent outer peripheral portion 42e1 of the bent portion 42e is totally reflected by the bent outer peripheral portion 42e1. The high-pressure fluid totally reflected by the bent outer peripheral portion 42e1 flows toward the tip of the jetting portion 42f while forming a certain angle with the axis C4, and interferes with the high-pressure fluid flowing along the axis C4, obstructing the flow of the high-pressure fluid flowing along the axis C4. Therefore, if the angle α approaches an acute angle, the flow rate of the high-pressure fluid jetted from the jetting portion 42f becomes less than the discharge flow rate set by the pressure pump 2. Furthermore, the flow rate of the high-pressure fluid jetted to the connecting member 5 decreases, which reduces the degree of vacuum in the connecting member 5 and degrades dredging workability.

[0038] In this way, after passing through the bent portion 42e of the jet nozzle 4, the high-pressure fluid travels straight along the axis C4 of the downstream flow path 42b3, which is formed in a straight line facing the discharge pipe 7, and flows into the connecting member 5. In the downstream flow path 42b3, the flow rate of the high-pressure fluid flowing near the axis C1 increases, while the flow rate of the high-pressure fluid ejected from the tip of the jet nozzle 4 decreases as the fluid moves away from the axis C1 around the center. This configuration makes the degree of vacuum created in the connecting member 5 highest near the center of the connecting member 5, and minimizes the accumulation of sediment dredged by the suction pipe 6 within the connecting member 5. Furthermore, because the high-pressure fluid ejected from the tip of the ejection portion 42f of the jet nozzle 4 is ejected in a concentrated manner near the axis C1, the high-pressure fluid can reach the discharge pipe 7 without accumulating within the connecting member 5, smoothing the flow of the high-pressure fluid flowing within the jet nozzle 4 and ensuring a predetermined dredging capacity.

[0039] 3, the connecting member 5 has an inverted "T" shape when viewed from the front and a hollow connecting member body 51. The connecting member body 51 has three ends: an inlet portion 51a, a discharge portion 51b, and a suction portion 51c, and each portion has three connecting flanges: a nozzle-side flange 52, a discharge-side flange 53, and a suction-side flange 54.

[0040] The connecting member body 51 is connected via each flange portion to three fluid flow passages: the injection nozzle 4, the suction pipe 6, and the discharge pipe 7. Material deposited on the bottom of a river or the like is sucked into the connecting member 5 via the suction pipe 6 and discharged to the outside via the discharge pipe 7.

[0041] Each flange portion 52, 53, 54 is a disk-shaped expanded portion that extends radially outward from each end of the connecting member body 51 and is formed as part of the connecting member body 51. The nozzle-side flange portion 52 and the discharge-side flange portion 53 are disposed opposite each other. That is, the nozzle-side flange portion 52 and the discharge-side flange portion 53 are arranged along the same axis C1, with the nozzle-side flange portion 52 being the upstream end of the high-pressure fluid flow and orthogonal to the axis C1, and the discharge-side flange portion 53 being the downstream end of the high-pressure fluid flow and orthogonal to the axis C1. The suction-side flange portion 54 has an axis C5 that is orthogonal to the axis C1 of the nozzle-side flange portion 52 and the discharge-side flange portion 53. The suction-side flange portion 54 is arranged at the upstream end in the flow direction of the conveyed material flowing into the connecting member 5 via the suction pipe 6 and orthogonal to the axis C5. That is, the suction-side flange portion 54 is oriented orthogonal to the nozzle-side flange portion 52 and the discharge-side flange portion 53.

[0042] The nozzle-side flange portion 52 is a disk-shaped expanded diameter portion that extends radially outward from the upstream end portion of the connecting member main body 51 on the axis C1, and is formed as a part of the connecting member main body 51. The nozzle-side flange portion 52 forms the upstream end face of the connecting member main body 51.

[0043] The discharge-side flange portion 53 is a disk-shaped expanded diameter portion that extends radially outward from the downstream end portion of the axis C1 of the connecting member body 51, and is formed as a part of the connecting member body 51. The nozzle-side flange portion 52 is the portion of the connecting member body 51 that forms the downstream end face 51d.

[0044] The suction side flange portion 54 is a disk-shaped expanded diameter portion formed by extending the upstream end face 51e of the connecting member body 51 on the axis C5 outward in the radial direction, and is formed as a part of the connecting member body 51.

[0045] The flanges 52, 53, 54 are connected to the flange 43 of the injection nozzle 4, the connecting flange 63 of the suction pipe 6, and the connecting flange 73 of the discharge pipe 7 via fixing means such as bolts.

[0046] The suction pipe 6 is installed at one end on the bottom of a river or a sedimentation basin and connected at the other end to the connecting member 5. The suction pipe 6 sucks up sediment and other materials deposited on the bottom of the river or sedimentation basin according to the vacuum created in the connecting member 5. The suction pipe 6 is connected to the connecting member 5 perpendicular to the axis C1 of the connecting member 5. The suction pipe 6 has a hollow, cylindrical suction pipe body 61, which contains a transport passage 62 for circulating dredged materials and fluids. As shown in FIG. 3, the transport passage 62 has approximately the same diameter as the discharge pipe 7, which discharges dredged materials. The suction pipe 6 is connected to the connecting member 5 so that its axis C5 is located approximately in the center of the left-right direction. The connecting member 5 and the suction pipe 6 are fixed via a connecting flange 63.

[0047] The discharge pipe 7 is a section that discharges the high-pressure fluid sprayed from the tip of the injection portion main body 42a of the injection nozzle 4 and the transported material sucked by the suction pipe 6 to the outside of the ejector pump 1. The discharge pipe 7 has a cylindrical discharge pipe main body 71 with a hollow interior, and has a discharge flow passage 72 inside for circulating the dredged transported material and the high-pressure fluid. The discharge pipe 7 has a connecting flange portion 73 near the end on the connecting member 5 side. The connecting flange portion 73 is a disc-shaped expanded portion that juts outward in the radial direction near the upstream end of the discharge pipe main body 71, and is formed as part of the discharge pipe main body 71.

[0048] The discharge pipe 7 is connected and fixed to the connecting member 5 by fixing the connecting flange portion 73 to the discharge side flange portion 53 of the connecting member 5 via a fixing means. The base end of the discharge pipe 7 connected to the connecting member 5 is provided at the discharge portion 51b of the connecting member 5. In other words, the base end of the discharge pipe 7 is inserted into the connecting member 5 up to the vicinity of the right outer peripheral edge portion of the suction pipe main body 61 in a front view of the suction device 3. The right side in FIG. 3 refers to the downstream side in the flow direction of the high-pressure fluid sprayed from the spray portion 42 of the spray nozzle 4.

[0049] In this way, by inserting the base end of the discharge pipe 7 into the connecting member 5 up to near the right outer peripheral edge of the suction pipe main body 61 and arranging the tip of the spray portion 42 of the spray nozzle 4 parallel to the axis C1 of the connecting member 5, the high-pressure fluid ejected from the spray portion 42 of the spray nozzle 4 reaches the discharged material passage 72 before diffusing inside the connecting member main body 51, allowing the high-pressure fluid to push the liquid filling the discharged material passage 72 downstream and preventing the soil and sand dredged by the suction pipe 6 from stagnating in the discharged material passage 72. In other words, by arranging the base end of the discharge pipe 7 close to the tip of the spray portion 42 and arranging the spray portion 42 so that the high-pressure fluid ejected from the tip of the spray portion 42 travels in a straight line, the flow of liquid in the discharged material passage 72 is prevented from being obstructed by the material, and the material can be reliably discharged outside the discharge pipe 7.

[0050] According to the ejector pump 1 of this embodiment as described above, by connecting multiple injection nozzles 4 to the connecting member 5, the flow rate of the high-pressure fluid sprayed into the connecting member 5 is increased compared to conventional ejector pumps, and the degree of vacuum created within the connecting member 5 is improved, thereby increasing the amount of transported material that can be sucked into the suction pipe 6, improving the dredging action of the ejector pump 1 and making dredging work more efficient.

[0051] Furthermore, by configuring the injection nozzle 4 with a connecting flow path 42b2 that gradually narrows the flow path of the high-pressure fluid, the flow rate of the high-pressure fluid flowing through the injection section internal flow path 42b can be improved, ensuring a flow rate that corresponds to the setting value of the pressure pump 2. By ensuring the flow rate of the high-pressure fluid flowing into the connecting member 5, the degree of vacuum created in the connecting member 5 can be improved compared to conventional ejector pumps, making dredging work using the ejector pump 1 more efficient.

[0052] In addition, by forming a bent portion 42e in the injection nozzle 4 that changes the direction in which the high-pressure fluid flows, the flow rate of the high-pressure fluid that flows into the injection nozzle 4 from the pressure pump 2 via the flow piping P and is ejected from near the axis C1 of the connecting member 5 is increased, and the degree of vacuum created within the connecting member 5 is formed so that it is highest at the center of the connecting member 5 and decreases concentrically from the center.This makes it easier for the transported material sucked by the suction pipe 6 to pass near the center of the connecting member 5, minimizing the risk of the transported material becoming stagnant inside the connecting member 5 and allowing the transported material to be reliably sent to the discharge logistics passage 72 of the discharge pipe 7.

[0053] Furthermore, as shown in Figures 2 and 4, by arranging multiple injection nozzles 4 symmetrically about the axis C1, and by arranging the injection sections 42f adjacent to each other and providing the connecting sections on the axis C1, a region of high vacuum is created in the center of the connecting member 5, and the material being transported by the suction pipe 6 can be moved to the discharge pipe 7 without being retained in the connecting member 5.

[0054] Furthermore, in a front view of the suction device 3, the tip of the spray nozzle 4 extends to the left peripheral edge of the suction pipe body 61 of the suction pipe 6, and the base end of the discharge pipe 7 extends to the right peripheral edge of the suction pipe body 61 of the suction pipe 6. As a result, the high-pressure fluid sprayed from the spray nozzle 4 enters the discharge pipe 7 while maintaining a high pressure state, and the liquid filling the discharge pipe 7 is pressed by the high-pressure fluid sprayed from the spray nozzle 4, and is discharged from the tip of the discharge pipe 7 without stagnating within the discharge pipe 7. In other words, the smooth flow of the liquid filling the discharge pipe 7 makes it easier for the transported object that has entered the discharge pipe 7 to move, allowing it to be reliably discharged from the tip of the discharge pipe 7.

[0055] Although one embodiment of the present invention has been described, the above description is merely an example of the present invention, and the present invention is not limited to the above embodiment. Therefore, even if the embodiment is different from the above embodiment, various modifications can be made depending on the design, etc., as long as they do not deviate from the technical concept of the present invention. [Explanation of symbols]

[0056] 1 Ejector pump 2 Pressure pump 3 Suction device 4 spray nozzles 5 Connecting members 6 Suction tube 7 Discharge pipe 41 Connecting part 42 Injection part 51 Connecting member body 61 Suction tube body 62 Sediment flow path 71 Discharge pipe body C1,C2,C3,C4,C5 Axis P Flow piping W water

Claims

1. a pressure pump that pressurizes and supplies the fluid; a suction device that receives the high-pressure fluid pressurized by the pressure pump and generates a suction effect; and The suction device is a plurality of injection nozzles that inject high-pressure fluid supplied from the pressure pump; a connecting member in which a negative suction pressure is generated by the high-pressure fluid being sprayed from the spray nozzle; a suction pipe that sucks the transported object by a suction negative pressure generated by the connecting member; a discharge pipe that discharges the transported object sucked into the connecting member through the suction pipe to the outside of the connecting member; Including, The plurality of injection nozzles are connecting flow pipes to the pressure pump so that each injection nozzle has an independent flow path; a connecting portion connected to the other end of the flow pipe; an ejection part connected to the connecting part and having a tip part inserted into the connecting member; and The injection unit is a bending portion that bends the flow direction of the high-pressure fluid flowing in from the connecting portion in a direction perpendicular to a side surface of the connecting member; a jetting portion provided downstream of the bent portion, The ejection portion is provided so that outer circumferential surfaces of the injection nozzles are in contact with each other, The bent portion is bent so that an axis of the connecting portion and an axis of the ejection portion form an obtuse angle.

2. The suction pipe is connected to the connecting member in a direction perpendicular to the injection portions of the plurality of injection nozzles and the discharge pipe, and the tip of the injection portion extends to the rear peripheral edge of the suction pipe.

2. The ejector pump according to claim 1, wherein:

3. 3. The ejector pump according to claim 2, wherein the connecting member has an inlet portion into which the high-pressure fluid pressurized by the pressure pump flows, a discharge portion provided opposite the inlet portion, and a suction portion provided perpendicular to the inlet portion and the discharge portion, and the injection tip portion of the injection nozzle is disposed approximately at the center of the inlet portion.

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