JP5362648B2 - Backflow prevention valve for pump and pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backflow prevention valve for a pump for stabilizing a discharge flow rate without a variation of an operation point of the pump due to an unstable movement of a valve body constituting the backflow prevention valve caused by a discharge flow, and a pump device using the backflow prevention valve for the pump. <P>SOLUTION: The backflow prevention valve for the pump is attached to an end of a pump discharge pipe. A valve body 6 is divided into two or more parts in a vertical direction, and each valve body is swingably attached to a valve base 18 via hinge mechanisms 17. Vertical ribs 15 and a lateral rib 16 are provided on an outer surface of each valve body 6. Guiding plates 20 are arranged, between a substantial top part of the lateral rib 16 of the valve body 6 positioned on the lower side and an outer surface of this lower valve body 6, to incline at a predetermined angle &alpha; with respect to the outer surface, and are provided for guiding a liquid flow flowing along the outer surface of the lower valve body 6 toward a tip end part of the valve body 6 over the top part of the lateral rib 16. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a pump backflow prevention valve that is provided at a discharge port at the end of a pump discharge pipe and prevents liquid from flowing back from the discharge side to the pump and the suction pipe side, and the pump backflow prevention valve It is related with the pump apparatus provided with.

  The pump backflow prevention valve has a structure in which a valve element is opened by a discharge water flow discharged from a discharge port of a discharge pipe. Further, the valve body is provided with a reinforcing rib in order to ensure the strength due to the actual lift when closed. The valve body is designed to open naturally by a moment caused by water flow, and the opening degree is set to about 30 ° to 45 ° with respect to the vertical. In the case of a relatively large backflow prevention valve, a valve body that is divided into a plurality of upper and lower parts is installed on the valve body via a hinge mechanism in order to ensure the strength of the valve body.

  FIG. 1 is a diagram showing a schematic configuration of a drainage machine station including a pump device having a backflow prevention valve in which a valve body is divided vertically. In FIG. 1, 100 is a suction water tank and 200 is a discharge water tank. The suction pipe 1 is disposed in the suction water tank 100, and the suction port 1a is opened. A pump casing 3 of a pump (horizontal axis pump) 2 is connected to the suction pipe 1, and a discharge pipe 5 is connected to the discharge side of the pump casing 3 via a discharge valve 4. At the outlet 5a, a backflow prevention valve 7 having a valve body 6 divided into two in the vertical direction is attached. In addition, 8 is a reduction gear, 9 is a drive machine (electric motor etc.), 10 is a full water detector, 11 is a vacuum pump, 12 is an electric motor.

  In the drainage station having the above-described configuration, the motor 12 is started to operate the vacuum pump 11 to perform an intake (exhalation) operation, and when the full-water detector 10 detects that the pump casing 3 is full, the driving is performed. The machine 9 is activated. As a result, the rotational force of the drive unit 9 is transmitted to the pump rotary shaft 13 via the speed reducer 8, and a pump impeller (not shown) disposed in the pump casing 3 rotates. The water sucked up from the suction water tank 100 through the suction pipe 1 by the rotation of the pump impeller is discharged from the discharge port 5a of the discharge pipe 5 into the discharge water tank 200. With this discharged water flow, the valve bodies 6 and 6 divided above and below the check valve 7 are opened. Further, when the discharge of water is stopped, each valve body 6, 6 is closed by its own weight and the water pressure in the discharge water tank 200.

  FIG. 2 is a diagram showing an external configuration of the backflow prevention valve 7 provided at the discharge port 5 a of the discharge pipe 5. As shown in the drawing, the backflow prevention valve 7 has valve bodies 6 and 6 that are divided into two parts in the vertical direction. The valve bodies 6 and 6 are supported by the valve body 18 via hinge mechanisms 17 and 17 so as to be rotatable (swingable). The valve body 18 is connected to a discharge port 5 a (see FIG. 1) of the discharge pipe 5 through a flange 19. A plurality of (three in the figure) ribs 15 are provided in the vertical direction on the outer surfaces of the valve bodies 6, 6, and horizontal ribs 16 are provided between the vertical ribs 15 and 15. Thus, by providing the vertical rib 15 and the horizontal rib 16 on each valve body 6, each valve body 6 can have rigidity that can withstand the actual head of the drainage station.

JP 2001-349453 A Japanese Patent Laid-Open No. 2006-97779

  However, since the backflow prevention valve 7 having the conventional configuration has the ribs 16 in the lateral direction, the flow of water discharged from the discharge port 5a of the discharge pipe 5 is disturbed, and the valve bodies 6 and 6 are moved up and down. There is a problem in that the resistance of the backflow prevention valve (flap valve) 7 is increased and the discharge flow rate is adversely affected.

Figure 3 is a diagram showing the movement of the valve body 6,6 the flow of water and check valve 7 to be discharged from the valve body 18 connected to the discharge pipe 5. Issued can discharge pipe 5 or al-ejection as shown by an arrow A water, as shown by the arrow A1, it flows in a substantially uniform flow of valve body 18, the water flow discharged from the discharge port above The valve body 6 and the lower valve body 6 are opened in an opening degree (angle with respect to the end surface 18a of the valve body 18) θ within a range of 30 ° to 45 °, and flow into the discharge water tank 200 (see FIG. 1). . At this time, the water flow flowing below the lower valve body 6 is not greatly disturbed as shown by the arrow A2, but the water flow flowing between the upper valve body 6 and the lower valve body 6 is the outer surface of the lower valve 6 Is disturbed as shown by an arrow A3 due to the influence of the lateral ribs 16 provided in

  As described above, the water flow between the upper valve body 6 and the lower valve body 6 is disturbed as indicated by an arrow A3, so that the upper valve body 6 and the lower valve body 6 are both centered on the hinge mechanisms 17 and 17. Rocks. FIG. 4 is a diagram showing a pump performance curve. The loss curve fluctuates in the range of B due to the swinging of the upper and lower valve bodies 6 and 6 of the check valve 7. As a result, the pump flow rate, that is, the operating point of the pump 2 fluctuates in the range of C. Since the operating point of the pump 2 fluctuates in this way and the flow rate is not stable, the load of the drive machine (electric motor or the like) 9 also fluctuates.

If the pump load fluctuates in an unstable manner as described above, there is a risk of deteriorating the equipment in the drainage station. Further, when the pump delivery rate becomes unstable, the waves on the discharge side is generated, when the discharge side is river was also a problem that out adversely affect the vessel or navigating river.

  The present invention has been made in view of the above points, and there is no fluctuation of the pump operating point due to the fluctuation of the valve body constituting the check valve by the discharge flow, and the pump check valve for stabilizing the discharge flow rate, and the pump discharge It aims at providing the pump apparatus which attached the backflow prevention valve for pumps to the discharge port of a pipe | tube.

In order to solve the above-described problems, the present invention includes a valve body swingably attached to a valve body attached to an end of a pump discharge pipe. A backflow prevention valve for a pump configured to close the valve body when stopped, the valve body is divided into two or more in the vertical direction, and each valve body is swingably attached to the valve body. Longitudinal ribs and lateral ribs are provided on the outer surface so that the valve body has sufficient strength to withstand the hydraulic pressure applied to the outer surface, and the approximate top of the lateral ribs of the valve body located below and with respect to outer surface disposed inclined obliquely between the outer surface of the valve body, a fluid flow flowing between the valve body located in the valve body and the lower positioned upwardly discharged from the valve body, the lateral A guide plate that smoothly guides the tip of the valve body beyond the top of the rib is provided.

  Further, the present invention is characterized in that, in the backflow prevention valve for a pump, a filler is filled in a space surrounded by an outer surface of a valve body located below, a lateral rib and a guide plate.

The present invention also includes a suction pipe and a discharge pipe connected to the pump casing, and by rotating a pump impeller disposed in the pump casing, the liquid sucked in the suction pipe is reversed from the end of the discharge pipe. In the pump device that discharges to the discharge side through the stop valve, the check valve for a pump according to claim 1 or 2 is used as the check valve.

The present invention is arranged inclined obliquely with respect to said outer surface between the outer surface of Ryakuitadaki portion lateral ribs and the valve body of a valve body located below, located above discharged from the valve body the valve body and the liquid stream flowing between the valve body located below, so over the top portion of the transverse rib provided with a guide plate for guiding smoothly to the distal end of the valve body, the valve body is located below the valve body The liquid flow spouted toward the pipe is guided to the guide plate and smoothly flows to the tip of the valve body over the top of the lateral rib, so that the pump operating point does not fluctuate due to the fluctuation of the valve body, and the discharge flow rate Can be provided.

  Further, according to the present invention, since the filler is filled in the space surrounded by the outer surface of the valve body located in the lower side, the lateral rib and the guide plate, the rib, the valve body, and the guide plate are integrated to improve rigidity. The reliability of the valve disc is improved. In addition, since liquid does not accumulate in the space, corrosion of the valve body, ribs, and the like due to the liquid can be prevented, and a longer life (improved reliability) can be achieved.

  Further, the present invention uses the above-described check valve for a pump as the check valve at the end of the discharge pipe of the pump device, so that it is possible to provide a pump device in which the discharge flow rate is stable without fluctuation of the pump operating point.

It is a figure which shows schematic structure of the drainage machine station provided with the pump apparatus which comprises a backflow prevention valve. It is a figure which shows the external appearance structure of the backflow prevention valve for pumps provided with the valve body divided | segmented up and down conventionally. It is a figure for demonstrating operation | movement of the backflow prevention valve for pumps shown in FIG. It is a figure which shows a pump performance curve. It is a figure which shows the external appearance structure of the backflow prevention valve for pumps provided with the valve body divided | segmented up and down which concerns on this invention. It is a figure for demonstrating operation | movement of the backflow prevention valve for pumps shown in FIG. It is a figure which shows the valve body of the backflow prevention valve for pumps which concerns on this invention, a horizontal rib, and a guide plate. It is a figure which shows the valve body of the backflow prevention valve for pumps which concerns on this invention, a horizontal rib, and a guide plate.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 5 is a diagram showing an external configuration of a backflow prevention valve for a pump according to the present invention. In FIG. 5, the parts denoted by the same reference numerals as those in FIGS. 1 to 3 indicate the same or corresponding parts. As shown in FIG. 2, the backflow prevention valve 7 includes a valve body 6 and a valve body 6 which are divided into upper and lower parts. The upper valve body 6 and the lower valve body 6 are hinged mechanisms 17 and 17 and valve bodies 18 respectively. It is rotatably supported by.

  A plurality of (three in the figure) ribs 15 are provided on the outer surface of each valve body 6 in the vertical direction, and the ribs in the horizontal direction are arranged between the ribs 15 and the ribs 15 and outside the outer ribs 15 at predetermined positions. 16 is provided, and each valve body 6 is rigid enough to withstand the entire head of the drainage station. A guide plate 20 is provided between the top of the lateral rib 16 of the lower valve body 6 and the upper surface of the valve body 6 to guide the water flow discharged from the discharge pipe 5.

6 is a diagram illustrating the movement of the valve element 6,6 the flow of water and check valve 7 to be discharged from the valve body 18 connected to the discharge pipe 5. As shown in the drawing, a flange 19 of the valve body 18 is connected to the flange 5 b of the terminal discharge port of the discharge pipe 5. Discharged from the discharge pipe 5 as indicated by an arrow A water, as shown by the arrow A1, it flows in a substantially uniform flow of valve body 18, the water flow discharged from the discharge ports vertical valve body 6 , 6 is pushed up in the range of the opening degree θ = 30 ° to 45 ° and flows into the discharge water tank 200 (see FIG. 1). At this time, the water flowing under the lower valve body 6 is not disturbed, and as shown in FIG. 3, the flow is smooth as shown by an arrow A2. Moreover, it since is provided the guide plate 20 is also water flowing between the upper valve body 6 and the lower valve body 6 on the upper surface of the valve body 6 of the lower, which is disturbed to be a flow as shown by an arrow A2 occurs There will be a smooth water flow.

Thus, since the water discharged from the discharge port of the valve body 18 becomes Re smooth flow as indicated by arrow A2, A2, that above the valve body 6 also together swings the valve body 6 is also lower Absent. From therefore the pump flow rate is stabilized, the driving machine (see FIG. 1) 9 loads and pump load is stable, or early deterioration of the equipment of the drainage pump station, the waves unstable yo Ri discharge side of the pump delivery rate And there is no fear of adversely affecting the ships navigating the river.

As shown in FIG. 7, the guide plate 20 is disposed across the top of the lateral rib 16 and the outer surface (outer surface) of the valve body 6, and is inclined at an angle α with respect to the outer surface (upper surface) of the valve body 6. Are arranged. The angle flowing to smoothly along the discharge port flow discharged from an arrow A2 on the upper surface of the guide plate 20 as shown in (see FIG. 6) of the guide plate 20 of the angle α is the valve body 18 against the outer surface of the valve body 6 The length is set in accordance with the height dimension of the lateral rib 16 so that the valve bodies 6 and 6 of the backflow prevention valve 7 can be designed and opened during pump operation in order to make the flow of discharged water smooth. The degree (design angle with respect to the end surface 18a of the valve body 18) is preferably θ or less (α ≦ θ). Thereby, the discharge water flow is stabilized more effectively, and the pump can be operated stably.

  Further, as shown in FIG. 8, a space surrounded by the guide plate 20, the guide plate 20, and the rib 16 is filled with a filler 21 such as a mortar or a resin material. As a result, the guide plate 20, the rib 16, and the valve body 6 are integrated, and the rigidity can be increased. That is, the reliability in strength can be improved. In addition, when the space 21 is not filled with the filler 21, the accumulated water may enter the space and induce corrosion. By filling with the filler 21, the accumulated water is eliminated in the space, The deterioration of the valve body 6 due to corrosion can be prevented, and the life of the check valve 7 can be extended (reliability improvement).

  In the above embodiment, the cylindrical discharge pipe whose discharge pipe 5 of the pump 2 has a circular cross section has been described as an example. However, in a pump station such as a large drainage station, the discharge pipe 5 has a rectangular cylindrical discharge section. There is also a pump station with pipes. In this case, the discharge port of the valve body of the check valve is also rectangular, and when the area is large, the valve body of the check valve may be divided into a plurality of parts. In order to increase the rigidity of the valve body, when the vertical and lateral ribs are provided on the valve body arranged in the vertical direction, the discharge water flow is caused by the laterally arranged ribs as in the case of the cylindrical discharge pipe. Is disturbed and the valve body swings. Also in this case, a guide plate for smoothly guiding the water discharged from the discharge port of the valve body to the tip of the valve body 6 across the lateral rib is provided between the top of the rib, the valve body, and the upper surface. Thus, it is possible to prevent the turbulent flow of the discharge water flow, and it is possible to perform a stable pump operation as in the above embodiment.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. For example, in the above embodiment, the drainage station that drains water has been described as an example. However, the present invention is not limited to water but also includes a backflow prevention valve that is attached to a discharge pipe end of a pump used in a pumping station that pumps various liquids. Such a backflow prevention valve for a pump can be used.

  The present invention is arranged between the top of the rib in the lateral direction of the valve body located below and the outer surface of the valve body, and is inclined at a predetermined angle with respect to the outer surface, and the liquid flow flowing along the outer surface of the valve body is laterally transmitted. Since the guide plate that leads to the tip of the valve body beyond the top of the rib is provided, the liquid flow discharged from the valve body toward the valve body located below is guided to the guide plate and the lateral ribs Since the pump flows smoothly to the tip of the valve body beyond the top, a pump backflow prevention valve with a stable discharge flow rate without fluctuation of the pump operating point due to the fluctuation of the valve body, and a pump device equipped with a backflow prevention valve for the pump Can be used.

DESCRIPTION OF SYMBOLS 1 Suction pipe 2 Pump 3 Pump casing 4 Discharge valve 5 Discharge pipe 6 Valve body 7 Backflow prevention valve 8 Reducer 9 Drive machine 10 Full detector 11 Vacuum pump 12 Electric motor 13 Pump rotating shaft 15 Vertical rib 16 Horizontal rib 17 Hinge mechanism 18 Valve body 19 Flange 20 Guide plate 21 Filler

Claims (3)

Back flow for a pump comprising a valve body swingably attached to a valve body attached to the end of a pump discharge pipe, wherein the valve body is opened by liquid discharge and the valve body is closed by stopping liquid discharge. A prevention valve,
The valve body is divided into two or more in the vertical direction, and each valve body is swingably attached to the valve body,
The outer surface of each valve body is provided with a longitudinal rib and a lateral rib so that the valve body has rigidity sufficient to withstand the hydraulic pressure applied to the outer surface ,
Valve body, wherein between the outer surface of the lateral Ryakuitadaki portion of the rib and the valve body of the valve body which is positioned downward relative to the outer surface disposed inclined obliquely, discharged from the valve body located in the upper And a guide plate that smoothly guides the liquid flow flowing between the valve body located below and the top of the lateral rib to the tip of the valve body. valve. The backflow prevention valve for a pump according to claim 1 ,
A backflow prevention valve for a pump, wherein a filler is filled in an outer surface of the valve body positioned below, the lateral rib, and a space surrounded by the guide plate. A suction pipe and a discharge pipe connected to the pump casing are provided. By rotating a pump impeller arranged in the pump casing, the liquid sucked in the suction pipe is discharged from the end of the discharge pipe through a check valve to the discharge side. In the pump device
A pump device using the check valve for a pump according to claim 1 or 2 as the check valve.

Images