JP4932191B2 - Hand pump - Google Patents

Description

  The present invention relates to a hand pump used for supplying drinking water or the like.

  As a means of securing drinking water for disaster victims and evacuees during disasters such as earthquakes, floods, and typhoons, water (liquid) from existing wells and other sources is used as drinking water using a hand pump. Things are going on.

  Many hand pumps use a piston that has one end as a suction side and the other end as a discharge side as a means for sucking up water. A structure in which an operation lever or the like is assembled is used. Such a hand pump has a structure (promotion type) in which a discharge chamber is assembled at an end portion on the discharge side of a cylinder so that water is discharged from the discharge chamber while ensuring a predetermined pressure.

  In such a promotion type hand pump, the end of the piston rod extending from the piston is penetrated while being sealed from the wall of the discharge chamber to the outside, and the penetrating rod end is operated via a link mechanism like a crank mechanism. A structure in which a lever is connected is adopted so that the piston can reciprocate from a state in which the inside of the discharge chamber is kept hermetically closed. Specifically, conventionally, the operation lever has a structure that is rotatable so that the tip can swing along the axial direction of the cylinder, and the link mechanism has a tip of the operation lever and a base end of the piston rod. A structure is used in which the parts are rotatably connected by links. Now, when the operating lever is turned, the operating lever and the link cooperate to operate in the contracting direction (folding direction) or the extending direction (opening direction), and the piston rod passes through the discharge chamber. The section is used as a guide to linearly move (reciprocate) along the axial direction of the cylinder.

  Normally, the hand pump is configured such that the piston rod f is pulled out most when the operation lever a and the link c are fully opened as shown in FIG. When opening to the maximum, the rotation fulcrum b of the operating lever a and the rotation fulcrums d and g on both sides of the link are arranged in series.

  By the way, as shown in FIG. 4, the distance L1 from the rotation fulcrum b of the operation lever a to the rotation fulcrum d of the link c tip, the rotation fulcrum d of the link c tip to the rotation fulcrum g of the piston rod f end. The distance L2 varies depending on the tolerance of various parts. For this reason, the hand pump h has a tendency that the sum of the distance L1 and the distance L2 is different from the distance L between the set rotation fulcrum b of the operating lever a and the rotation fulcrum g of the piston rod f end. is there. Therefore, in the hand pump h using the link b, when the piston rod f is most pulled out, a load tends to be applied from the lateral direction to the end of the piston rod f due to a dimensional difference.

  Here, the piston rod f of the promotion-type hand pump has a support span in which the rod portion closest to the piston (not shown) is guided by the penetrating portion j of the wall portion of the discharge chamber i when pulled out most. The unstable state becomes the narrowest. For this reason, when the piston rod f is pulled out to the outside most, the piston rod f tends to be inclined with the piston as a fulcrum due to generation of a moment due to a load applied to the rod end.

  However, although the sealing effect of a seal member (not shown) assembled to the through-hole j can be kept against a slight inclination, it is difficult to keep in an abnormal situation where the piston rod f is forcedly inclined by a moment.

  For this reason, when the piston rod f is inclined, the pressure water in the discharge chamber i may leak from the through portion j to the outside. In particular, when the inclination of the piston rod f occurs, since the pressure in the discharge chamber i is the highest, water leakage is likely to occur. In addition, the force for sending water from the discharge chamber i to the outside may be impaired.

    SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a hand pump that can perform a lever operation without causing an inclination of a piston rod.

In order to achieve the above object, the invention according to claim 1 is a cylinder having one end portion as a suction side and the other end portion as a discharge side, and a discharge chamber formed at the other end portion of the cylinder. A piston rod inserted through the wall of the discharge chamber into the cylinder, a seal portion that seals the through portion through which the piston rod passes, and A piston supported by an insertion end and reciprocally movable in the cylinder; an operation lever supported by the main body so as to be pivotable so that a tip swings along an axial direction of the cylinder; According to a telescopic motion performed in cooperation with the operation lever, the rotational movement input from the operation lever is rotatably connected between the distal end portion of the operation lever and the proximal end portion of the piston rod. A link that transmits to the stone rod as a reciprocating linear motion; a bolt member that is provided on the operation lever so as to be capable of moving back and forth toward the main body side; And the bolt member abuts against the abutment seat, so that when the lever is operated in the direction in which the piston rod is pulled out of the discharge chamber with the operation lever, the movement of the operation lever is A stopper portion is provided that holds the pivot points on both sides and the pivot points of the operation lever before the series of the pivot points are arranged in series.

  According to the first aspect of the present invention, the lever operation in the direction in which the piston rod is pulled out can be rotated only to the point where the stopper portion does not cause a behavior in which a load is applied from the lateral direction to the end of the piston rod. Therefore, the piston rod will not tilt during the lever operation of the hand pump.

  Therefore, the hand pump can improve the leakage of water from the discharge chamber and the reduction of the force delivered from the discharge chamber, and can always exhibit high pump performance.

In addition to the above SL effects, a simple structure, it is possible to perform the restriction of the operation lever.

[One Embodiment]
Hereinafter, the present invention will be described based on an embodiment shown in FIGS.

  FIG. 1 shows a partially sectioned front view showing the whole of a hand pump used at the time of a disaster, for example, in which 1 is the main body of the pump. The main body 1 has a vertically oriented cylinder 2 formed of a cylindrical casing. The cylinder 2 has a lower end (one end) as a suction side and an upper end (the other end) as a discharge side. The main body 1 has a suction cap 4 having a suction port 3 coupled to the lower part of the cylinder 2 as a part forming the suction side (for example, coupled using a flange 4a and a bolt nut 4b), and the discharge side on the upper part. As a component to be formed, a chamber 5 (corresponding to a discharge chamber of the present application) having an outlet 8a is coupled (for example, coupled using a flange 5a and a bolt nut 5b).

  A piston rod 8 extending in the axial direction is disposed in the cylinder 3 in a cylindrical feed passage 6 formed in the internal space of the cylinder 2 and extending in the vertical direction. A piston 7 as a slider is slidably accommodated in the feed path 6. The piston 7 is fixed to the lower end portion of the piston rod 8 using two kinds of holding tools such as a piston yoke 9 and a piston presser 10. The upper end of the piston rod 8 penetrates the center of the upper wall 5c of the chamber 5 so as to be slidable. As shown in FIG. 3, the penetrating portion 30 is provided with a seal portion 31 that seals between the rod portion and the upper wall 5c. In the seal portion 31, for example, a step portion 32 is formed in the upper half portion of the inner surface of the through hole 5d formed in the upper wall 5c, and the cross section has, for example, a Y-shape in the formed annular step space. A structure is used in which the annular packing member 33 is accommodated, a short cylindrical rod guide 34 is screwed into the remaining stepped portion, and the axial movement of the packing member 33 is restricted by the guide 34. More specifically, the lip portion 33a on the inner surface side of the packing member 33 is in elastic contact with the outer peripheral surface of the piston rod 8, and the lip portion 33a is slidably in contact with the outer peripheral surface of the rod portion. Seal between the rod parts.

  As shown in FIG. 1, a link type manual operation mechanism 14 is provided at the penetrating end of the piston rod 8 penetrating the chamber 5. The manual operation mechanism 14 will be described. Reference numeral 15 denotes a lever member rotatably supported on the side portion of the chamber 5, for example. The lever member 15 is supported by the side wall 15e of the chamber 5 so as to be rotatable, for example, using a support shaft 15a. The support shaft 15a is oriented in a direction perpendicular to the axial direction of the cylinder 2, and the entire lever member 15 is rotatable along the vertical direction. With this support, the end of the lever member 15 is allowed to swing along the axial direction of the cylinder 2. An operating rod 17 is connected to the rear end portion of the lever member 15 via, for example, an insertion-type fastening portion 16. Thus, a long operating lever 18 is formed on the side of the chamber 5. More specifically, the fastening portion 16 has a structure in which, for example, a cylindrical rod insertion portion 19 and a fastening bolt 20 screwed in and out of the rod insertion portion 19 so as to be able to advance and retract are used. That is, the operation rod 17 is fixed to the lever member 15 by inserting the end portion into the rod insertion portion 19 and screwing the fastening bolt 20 to fix the rod portion. The manual operation mechanism 14 is configured by rotatably connecting a distal end portion of the lever member 15 and an end portion of the piston rod 8 protruding from the chamber 5 by a link 22. In addition, the mutual connection uses the structure connected rotatably using the spindles 23 and 24. FIG.

  When the operating rod 17 is gripped by the manual operation mechanism 14 and the rod 17 is turned up and down, the lever member 15 and the link 22 are contracted (folded) or extended with the support shaft 23 as a fulcrum. Operating in the direction (opening direction), the piston rod 8 is moved up and down using the rod guide 34 assembled at the upper part of the chamber as a guide. That is, the piston 7 slides from the lowest point to the highest point of the feed path 6 by a manual pushing operation (manual operation) performed using the operation rod 17.

  Further, the operation lever 18 is devised so that when the piston 7 is moved upward, a load is not applied to the piston rod 8 from the lateral direction. When the lever is operated in the direction in which the piston rod 8 is pulled out from the chamber 5 by the operation lever 18 (operation from the upper side to the lower side), the lever operation is applied to the piston rod 8 from the lateral direction by the stopper portion 39. It can be done only before it reaches a state where there is a risk of being added. Specifically, as shown in FIGS. 1 and 2, the stopper portion 39 is a part of the operation lever 18, for example, the rod insertion portion 19, of the lever operation (operation from above to below), For example, a bolt member 40 is planted on the outer surface portion facing the chamber 5 as a protrusion protruding toward the chamber 5 so as to be able to advance and retract, and the bolt member 40 abuts on the outer surface of the side wall 5e of the chamber 5 corresponding to the bolt position. A structure in which a possible contact seat 41 is provided is used. The protruding length of the bolt member 40 is such that the lever operation from the upper side to the lower side may cause a load on the piston rod 8 from the lateral direction, that is, the pivot fulcrum b of the lever member 15 as shown in FIG. In order to avoid a situation in which the (support shaft 15a) and the rotational fulcrums d and g (23, 24) on both sides of the link 22 are arranged in series, the head of the bolt member 40, for example, at a position in front of the series arrangement. Is set so as to be received by the inclined seating surface 41a of the abutment seat 41. Specifically, as shown in FIG. 2, the operation lever 15 and the link 22 rotate immediately before the rotation fulcrums 15a, 23, 24 (corresponding to b, d, g in FIG. 4) are arranged in series. When the fulcrum 23 (corresponding to d in FIG. 4) is bent at the fulcrum (the shape of a dogleg), the bolt member 40 abuts against the abutment seat 41 when the variation of parts does not affect the piston rod 8. It has been adjusted to. This restricts (suppresses) the lever operation so as not to be performed thereafter.

  On the other hand, a check valve 11 constituting a suction valve is assembled in the suction cap 4. Further, a check valve 12 serving as a discharge valve is incorporated between the piston yoke 9 and the piston presser 10 by utilizing the central opening of the piston 7, and the piston 7 reciprocates in the cylinder 2. The suction cap 4 is guided to the chamber 5. In other words, the water from the water source is pumped up. In FIG. 1, a two-dot chain line indicated by 13 indicates a suction pipe (a pipe communicating with a water source) connected to the suction port 3, and 12a indicates a valve guide.

  On the other hand, a check valve 26 serving as an outlet valve and a discharge port body 27 having a discharge port 27a at the tip are sequentially connected to the outlet 8a of the chamber 5 (for example, coupled using a flange 28 and a bolt nut 29). . Thus, the water sent into the chamber 5 is discharged from the discharge port body 27 to the outside as the piston 7 reciprocates. In addition, the dashed-two dotted line shown by 21 shows the discharge piping (pipe connected with a faucet etc.) connected to the discharge port 27a.

  The hand pump configured in this way is used, for example, installed in a well serving as a water source or incorporated in a part of an emergency water supply device for disaster.

  That is, the hand pump holds the operation lever 18 and repeatedly rotates the lever member 15 in the vertical direction. Then, the rotational displacement of the lever member 15 is transmitted to the piston rod 8 while being contracted or extended between the lever member 15 and the link 22 with the support shaft 23 as a fulcrum, and the piston 7 is reciprocated in the cylinder 2. Let At this time, water from the water source is sucked into the suction side of the cylinder 2 by the negative pressure generated when the piston 7 moves upward from the lower side. In addition, due to the downward movement of the piston 7, the sucked water is sent to the discharge side of the piston 7 through the check valve 12 of the piston 7. Due to the continuous movement of the piston 7, water is sent from the check valve 26 to the discharge port body 27 while filling the chamber 5, and reaches a faucet (not shown).

  At this time, as shown in FIG. 2, the lever operation in the direction in which the piston rod 8 is pulled out from the chamber 5, that is, the lever operation when the operation lever 18 is pushed down from the upper side to the lower side is performed between the bolt member 40 and the contact seat 41. No further progress will be made due to the butting (regulation). As a result, the lever operation may cause a load to be input to the piston rod end from the lateral direction, that is, the support shaft 15a of the lever member 15, the support shaft 23 of the link 22, and the support shaft 24 of the piston rod end are in series. It won't be in the final state, and it will stop at the previous point.

  Therefore, during the lever operation of the hand pump, no load is applied from the link 22 to the end of the piston rod from the lateral direction, and the piston rod 8 does not tilt with the load as shown by the two-dot chain line in FIG. It moves while maintaining a straight state along the axial direction of the cylinder 2 as shown by the solid line inside. In FIG. 3, δ indicates the inclination of the piston rod 8 that is inclined.

  Therefore, the seal portion 31 of the chamber 5 can always exhibit a normal sealing effect, and there is no leakage of water from the through portion 30 of the chamber 5 or a decrease in the force delivered from the chamber 5. As a result, high pump performance can always be exhibited. In addition, the control of the lever operation can be performed simply by providing a protrusion on the operation lever 18 and providing a contact seat 41 for receiving it on the main body 1 side. In particular, when the bolt member 40 is used as the projecting portion, the position for restricting the movement of the operation lever 18 can be easily adjusted only by rotating the bolt member 40 in the tightening direction or the loosening direction.

  The present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention.

The front view which carried out the cross section which shows the hand pump which concerns on one Embodiment of this invention. The front view for demonstrating a state when the lever of the operation lever of the pump is operated from the upper part to the lower part. Sectional drawing which expands and shows the rod part which penetrates the discharge chamber of the pump. The front view explaining the conventional hand pump.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Main body, 2 ... Cylinder, 5 ... Chamber (discharge chamber), 7 ... Piston, 8 ... Piston rod, 7 ... Piston, 15 ... Lever member, 17 ... Operation rod, 18 ... Operation lever, 22 ... Link, 30 ... Penetration part, 31 ... seal part, 40 ... bolt member (projection part), 41 ... contact seat.

Claims (1)

A main body including a cylinder having one end portion as a suction side and the other end portion as a discharge side, and a discharge chamber formed at the other end portion of the cylinder;
A piston rod inserted through the wall of the discharge chamber into the cylinder;
A seal portion that seals a penetrating portion through which the piston rod penetrates;
A piston that is supported by the insertion end of the rod and that is reciprocally movable in the cylinder;
An operation lever that is rotatably supported by the main body so that the tip can swing along the axial direction of the cylinder;
According to an expansion / contraction operation performed in cooperation with the operation lever, the rotation movement input from the operation lever is rotatably connected between the distal end portion of the operation lever and the proximal end portion of the piston rod. A link that conveys the piston rod as a reciprocating linear motion,
A bolt member that is provided on the operating lever so as to be capable of advancing and retreating to the main body side, and that protrudes toward the main body side; and a contact seat that protrudes from the main body and receives the bolt member; When the lever is operated in the direction in which the piston rod is pulled out from the discharge chamber by the operation lever, the movement of the operation lever is changed between the rotation fulcrum on both sides of the link and the rotation of the operation lever. A hand pump characterized by comprising a stopper portion that is held at a point before the moving fulcrum is arranged in series.

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