JP6349146B2 - Foot valve - Google Patents

Description

  The present invention relates to a foot valve used for storing a pumping fluid on the suction side of the pump when the pump is stopped.

  In a water supply device that pumps water (pumping fluid) from a water receiving tank, etc. with a pump, the water is pumped through a suction pipe that extends from the suction section of the pump installed on land and is submerged in the water in the water receiving tank. (For example, refer to Patent Document 1).

  Many of the end portions of the suction pipes are provided with foot valves in order to avoid the occurrence of air lock (due to continued air suction for a long time) during pump operation.

  In such foot valves, strainers having ribs for removing foreign substances are provided at equal intervals along the circumferential direction in the lower part of the valve body.

Japanese Patent Laid-Open No. 11-166644

  Such a foot valve strainer has the following problems. That is, the rib portion of the strainer becomes a resistance when sucking up water, and the performance of the pump cannot be exhibited sufficiently. Therefore, it is preferable to increase the interval to reduce the resistance loss. On the other hand, if the distance is too wide, the resistance loss is reduced, but the rigidity of the strainer itself is reduced. In addition, the function of removing foreign substances must be ensured.

  Accordingly, an object of the present invention is to provide a foot valve capable of ensuring the rigidity of the strainer while ensuring the opening area in order to sufficiently exhibit the performance of the pump.

  In order to solve the above problems and achieve the object, the foot valve of the present invention is configured as follows.

  A plate-shaped valve seat having a suction port; a valve body provided at an upper portion of the valve seat via a rotation shaft; for opening and closing the suction port; a valve box covering the upper side of the valve seat; and the valve seat An annular outer peripheral portion formed along the outer peripheral edge of the valve seat, a support portion spaced downward from the valve seat and facing the suction port, and the outer periphery A strainer provided between the support portion and the support portion, and having a plurality of radially extending rib portions, wherein the plurality of rib portions are linearly formed between the support portion and the outer peripheral portion. It has the formed 1st rib and the 2nd rib formed in the downward convex curve between the said support part and the said outer peripheral part.

  According to the present invention, it is possible to ensure the rigidity of the strainer while ensuring the opening area in order to sufficiently exhibit the performance of the pump.

The side view shown partially cut away which shows the foot valve which concerns on one embodiment of this invention. The top view which looked at the strainer which comprises the foot valve from the lower side.

  FIG. 1 is a partially cutaway side view showing a foot valve 10 according to an embodiment of the present invention, and FIG. 2 is a plan view of a strainer 50 constituting the foot valve 10 as viewed from below.

  The foot valve 10 includes a valve seat 20 having a suction port 22, a disc-shaped valve body 30 that is provided above the valve seat 20 via a rotating shaft 23, and opens and closes the suction port 22, and the valve seat 20. A valve box 40 that covers the movable range of the valve body 30, a strainer 50 that is provided below the valve seat 20, and a lever portion 70 that is attached to the strainer 50 and opens and closes the valve body 30. ing.

  The valve seat 20 includes a plate-shaped valve seat main body 21, a suction port 22 provided substantially at the center of the valve seat main body 21, and a rotating shaft 23 that supports the valve body 30 in a swingable manner. . The rotating shaft 23 is provided on the second rib 62 side described later.

  The valve body 30 closes the suction port 22 due to its own weight and the weight of water when the pump is stopped, and is opened due to the negative pressure of the pump when the pump is operating. Further, during maintenance, it is pulled up from the outside by a wire or the like (not shown).

  The valve box 40 is connected to the suction pipe of the pump.

  The strainer 50 includes an annular outer peripheral portion 51 formed along the outer peripheral edge of the valve seat body 21, a support portion 52 that is spaced downward from the valve seat main body 21 and faces the suction port 22, and an outer periphery A plurality of rib portions 60 provided between the portion 51 and the support portion 52 and extending in the radial direction are provided.

  The plurality of rib portions 60 are formed in a curved line convex downward between the first rib 61 formed linearly between the support portion 52 and the outer peripheral portion 51, and between the support portion 52 and the outer peripheral portion 51. And a second rib 62.

  The lever portion 70 has a base end side provided on the outer peripheral portion 51 side of the strainer 50 so as to be swingable in the vertical direction, a tip end side projecting outward from the strainer 50, and an intermediate portion of the lever main body 71. The valve body 30 is disposed opposite to the valve body 30. When the distal end side swings upward, it contacts the valve body 30 to form a gap with the valve seat 20, and when the distal end side swings downward, the valve body 30 A contact portion 72 that is spaced apart from the contact portion 72.

  The pivot center shaft 73 of the lever body 71 is provided on the second rib 62, and at least one of the ribs adjacent to the second rib 62 is the first rib 61. For this reason, the operation | work which attaches the lever main body 71 to the 2nd rib 62 becomes easy. Further, since the swing center shaft 73 can be directly attached to the second rib 62, it is not necessary to separately provide a boss portion for attachment outside the strainer 50, and the outer diameter can be reduced.

  The foot valve 10 configured as described above operates as follows. That is, during the pump operation, the valve body 30 is lifted by the water flow sucked into the pump from the strainer 50 and the suction hole 22 is opened. Further, when the operation of the pump is stopped, the valve body 30 moves to the closing side by the water inside the pump returning through the suction hole 22 and closes the suction hole 22. Thus, water is accumulated on the suction side of the pump when the pump is stopped, and water on the suction side is immediately sucked when the pump is operated next time.

  The water flow passing through the strainer 50 is blocked by the plurality of rib portions 60. However, in the position where the first rib 61 and the second rib 62 are adjacent to each other, the extending direction of the rib is different, so that a gap as viewed from the horizontal direction is formed, and the opening Q having a sufficient opening area is provided. And resistance loss of water can be suppressed.

  Further, since the number of the first ribs 61 and the second ribs 62 does not decrease even if the opening Q is secured, the rigidity of the strainer 50 can be sufficiently secured.

  When discharging the water in the pump, the abutment portion 72 abuts the lower surface of the valve body 30 by swinging the tip end side of the lever body 71 upward with a chain or the like, and the valve body 30 Separate from the seat 20.

  According to the foot valve 10 according to the present embodiment, it is possible to sufficiently ensure the opening area in order to sufficiently exhibit the performance of the pump. Further, the rigidity of the strainer 50 can be ensured.

  When the opening areas are the same, the height of the strainer 50 can be suppressed, and the foot valve 10 can be reduced in size and weight. For this reason, it becomes possible to reduce manufacturing cost.

  The present invention is not limited to the above embodiment. Of course, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 10 ... Foot valve, 20 ... Valve seat, 30 ... Valve body, 40 ... Valve box, 50 ... Strainer, 60 ... Rib part, 61 ... 1st rib, 62 ... 2nd rib.

Claims (3)

A plate-shaped valve seat having a suction port;
A valve body provided on the upper portion of the valve seat via a rotation shaft, for opening and closing the suction port;
A valve box covering the upper side of the valve seat;
An annular outer peripheral portion provided on the lower side of the valve seat and formed along the outer peripheral edge of the valve seat; a support portion provided to be spaced downward from the valve seat and opposed to the suction port; A strainer provided between the outer peripheral portion and the support portion and having a plurality of rib portions extending in the radial direction,
The plurality of rib portions are formed in a curved line convex downward between the support portion and the outer peripheral portion, and a first rib formed linearly between the support portion and the outer peripheral portion. A foot valve having a second rib.   The base end side is provided on the outer peripheral portion side of the strainer so as to be swingable in the vertical direction, and the tip end side is formed so as to protrude outward from the strainer, and the lever body is disposed opposite to the valve body at an intermediate portion thereof. A contact portion that contacts the valve body when the tip side swings upward and forms a gap with the valve seat, and separates from the valve body when the tip side swings downward The foot valve according to claim 1, further comprising a lever having the following. The lever pivot center axis of the body, foot valve according to claim 2, characterized in that provided in the second rib.

Images