JP2007064105A - Hand pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hand pump preventing leak due to inclination of a piston rod. <P>SOLUTION: In this hand pump, an annular packing member 33 including an annular recess part 34 on an end surface and including a lip part 35 capable of sufficiently deforming in a radial direction by the recess part 34 in an inner circumference side of the recess part 34 is installed on a through part 30 of a delivery chamber 5 through which a piston rod 8 passes. Consequently, even if the piston rod 8 is inclined when rotary motion of an operation lever 18 is converted to reciprocating linear motion along a moving direction of a piston 7, the through part 30 is sealed by the packing member 33 while permitting inclination. <P>COPYRIGHT: (C)2007,JPO&INPIT

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, the use of water from existing well sources such as wells is being promoted as drinking water. It has been.

  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.

  The hand pump of the promotion type penetrates the end of the piston rod extending from the piston while sealing it from the wall of the discharge chamber to the outside, and connects the operation lever to the end of the penetrating rod via a link mechanism like a crank mechanism. By adopting the above structure, the piston can be reciprocated from the state in which the inside of the discharge chamber is kept hermetically sealed. Specifically, the operation lever has a structure that allows the tip to pivot so as to swing along the axial direction of the cylinder. The link mechanism has a structure between the tip of the operation lever and the base end of the piston rod. A structure is used in which the links 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 part is used as a guide to linearly move (reciprocate) along the axial direction of the cylinder. Then, with a reciprocating piston, water from a water source such as a well is sucked into the suction side of the cylinder and sent to the discharge chamber, and pressure water is supplied from the outlet of the discharge chamber to a water supply pipe or the like.

  Normally, the hand pump is configured such that when the operation lever a and the link c are opened to the maximum as shown in FIG. 9, the piston rod f is pulled out most. 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. 9, 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 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 pulled out most, the load F tends to be applied from the lateral direction to the end of the piston rod f due to dimensional variation.

  Here, when the piston rod f of the hand pump is withdrawn to the outermost part, 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 so that the support span becomes the narrowest. It becomes unstable. For this reason, although the piston rod f should be drawn straight, it is often seen that the piston rod f is pulled out to the outside while being shaken (tilted) with the piston as a fulcrum due to the moment generated by the load applied to the rod end from the lateral direction.

  Usually, in order to maintain airtightness in the discharge chamber, the promotion-type hand pump is provided with a gland packing (not shown) in a through portion j of the discharge chamber i through which the piston rod f passes, and the discharge chamber i and the piston rod f Sealing between the two is performed.

  However, although the sealing effect of the gland packing can be maintained against a slight inclination, it is difficult to maintain an abnormal shake (inclination) in which the piston rod f is forcibly inclined by a load applied from the lateral direction.

  For this reason, when the piston rod f is displaced, the pressure water in the discharge chamber i leaks from the through portion j to the outside.

  In the promotion-type hand pump, a drain tube (not shown) for releasing water that has passed through the brand packing, connected to the through-hole j, is used for a gland packing that exhibits a sealing effect when wet with pressure water. The water was discharged to a predetermined place.

  However, since this is a measure that allows water leakage as it is, it is inevitable that the pressure in the discharge chamber escapes. For this reason, there has been a problem that the force for pushing the pressure water from the hand pump to the water supply pipe or the like tends to decrease, and the pump performance cannot be fully exhibited.

  Then, the objective of this invention provides the hand pump which can prevent the water leak which the blurring (inclination) of a piston rod prevents.

  In order to achieve the above object, the invention according to claim 1 has an annular recess in the end surface of the discharge chamber through which the piston rod passes, and a diameter formed by the recess on the inner peripheral side across the recess. Adopted a structure in which an annular packing member with a lip part that can be sufficiently deformed in the direction is interposed so that the opening of the recess faces the axial direction of the piston rod and the lip part is pressed against the outer peripheral surface of the piston rod did. As a result, even if the piston rod is shaken (tilted) when the rotational movement of the operating lever is converted into a reciprocating linear movement along the moving direction of the piston, the packing member allows the through portion to be sealed while allowing the shake. I made it.

  The invention of claim 2 employs an annular packing member having a Y-shaped or U-shaped cross-section so as to obtain a higher followability to vibration and a higher sealing performance.

  In the invention of claim 3, a plurality of packing members are arranged in series in the penetrating portion along the axial direction of the piston rod so as to ensure sufficient sealing performance.

  According to the first aspect of the present invention, even if the piston rod is greatly shaken (inclined) during operation of the operation lever, the lip portion of the packing member is displaced while following the piston rod that is swayed, and the penetrating portion. , That is, between the wall surface of the discharge chamber and the outer peripheral surface of the piston rod.

  Therefore, it is possible to prevent water leakage due to the movement (tilt) of the piston rod. As a result, it is possible to prevent loss of the force fed by the hand pump, and to improve the pump performance of the promotion-type hand pump.

  According to the second aspect of the present invention, it is possible to ensure followability to high vibration of the piston rod and further high sealing performance with a more inexpensive structure.

  According to the third aspect of the present invention, it is possible to secure sufficient sealing performance with a simple structure even with a hand pump having a high push-up capability.

[First Embodiment]
Hereinafter, the present invention will be described based on a first embodiment shown in FIGS.

  FIG. 1 is a partially sectioned front view showing the entirety of a promotion-type hand pump used at the time of a disaster, for example, and FIG. 2 is an enlarged sectional view around the rod penetration portion of the hand pump.

  In FIG. 1, reference numeral 1 denotes a main body of the hand 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 portion of the piston rod 8 passes through a cylindrical penetrating portion 30 formed at the center of the upper wall 5 c of the chamber 5. A seal portion 31 is provided in the through portion 30 as shown in an enlarged view in FIG. 2, and the seal portion 31 seals between the rod portion and the wall surface of the through portion 30. The seal portion 31 uses an oil seal structure that sufficiently copes with shaking of the piston rod 8.

  The sealing portion 31 will be described. In the drawing, reference numeral 32a denotes a step portion for suppressing packing formed in a substantially upper half portion of the inner surface of the through hole 5d formed inside the through portion 30, and 32b denotes a step portion 32a. It is the level | step-difference part for packing accommodation formed continuously in the lower part. The stepped portion 32b is formed with a step smaller than the stepped portion 32a, and an annular packing member 33 having high follow-up performance is accommodated in an annular stepped space formed by the stepped portion 32b. This packing member 33 has an annular recess 34 along the circumferential direction on one end face as shown in FIG. 3, and has an annular lip 35 on the inner circumferential side sandwiching the recess 34, and the outer circumferential side. A packing body 33a is used which has an annular lip portion 36 and allows the lip portions 35, 36 to be sufficiently deformed and displaced in the diametrical direction using the recess 34. Specifically, for example, an EPDM material having a Y-shaped cross section in which an inner lip portion 35 and an outer lip portion 36 sandwiching a recess 34 as shown in FIG. An annular packing member 33 made of ethylene propylene diene monomer) is used. As shown in FIG. 2, the packing member 33 faces the opening of the recess 34 toward the cylinder side which is one axial direction of the piston rod 8, the lip portion 35 faces the outer peripheral surface of the piston rod 8, and the lip portion 36. Is placed in the stepped portion 32 b in a posture facing the wall surface of the chamber 5. Using this assembly, the inner peripheral lip portion 35 is pressed against the outer peripheral surface of the piston rod 8 by its own elasticity. Due to the deformability in the diametrical direction of the lip portion 35 obtained at this time, even when the piston rod 8 slides while being greatly shaken (tilted), the piston rod 8 moves between the piston rod 8 in the same manner as when the piston rod 8 moves straight. It has a structure that keeps the sealing performance. In other words, by providing the packing member 33 between the rod outer peripheral surface and the wall surface of the stepped portion 32b, the gap between the penetrating portions 30 is provided with a sealing performance that is rich in the followability of the piston rod 8. A short cylindrical rod guide 38 is screwed into the remaining stepped portion 32a so that the packing member 33 does not come out of the stepped portion 32b.

  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 rotatably supported by a bracket 5f formed on the side wall of the chamber 5, for example, via 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 end 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 retracted about the support shaft 23 (folding direction: FIG. 1). Alternatively, the piston rod 8 is moved in the extending direction (opening direction: FIG. 4) so that the piston rod 8 is raised and lowered along the axial direction of the cylinder 2 with the rod guide tool 38 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.

  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. By the valve action of each check valve 11, 12, the fluid is sent from the suction port 3 of the suction cap 4 into the chamber 5 through the inside of the cylinder 2. That is, the water of the water source is pumped up by the reciprocating motion of the piston 7. 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 fed 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 through the check valve 11 due to the negative pressure in the cylinder 2 generated when the piston 7 moves upward from the lower side. As the piston 7 moves downward from above, the water sucked into the cylinder 2 is sent to the discharge side of the piston 7 through the check valve 12 of the piston 7. Due to the continuation of this movement, the pressure water is sent out to the discharge port body 27 through the check valve 26 while filling the chamber 5 above the cylinder. And the force sent out becomes a pushing-up force, and water is pushed up to a faucet (not shown).

  During the lever operation, when the piston rod 8 advances to a position where it is pulled out to the maximum, the support shaft 15a of the lever member 15, the support shaft 23 of the link 22, and the support shaft 24 at the end of the piston rod are connected in series (as shown in FIG. On a straight line). At this time, from the lateral direction of the piston rod end, for the reason explained in FIG. 9, there is a behavior in which the load F is input as indicated by the arrow in FIG. Arise.

  Here, when the piston rod 8 is pulled out to the maximum, since the support span of the piston rod 8 is narrow and the support becomes unstable, the piston rod 8 is in the lateral direction as shown in FIG. Due to the load F applied from above, an inclination with the piston 7 as a fulcrum, that is, a shake occurs temporarily. In FIG. 4, δ indicates the inclination (blurring degree) of the piston rod 8 at that time.

  At this time, each part in the circumferential direction of the lip portion 35 of the packing member 33 can be greatly deformed / displaced inward by its own elasticity, and can be greatly deformed / displaced outwardly by entering the space of the recess 34. Thus, as shown in the enlarged view of FIG. 5, even if the piston rod 8 is shaken in the middle of pulling out the rod, the lip portion 35 is deformed and displaced while following the inclination of the piston rod 8, and the piston rod 8 is kept in sliding contact with the outer peripheral surface of the piston 8, and the seal with the piston rod 8 is maintained. That is, the through portion 30 maintains the sealing effect even if the piston rod 8 is shaken (inclined) during the extraction of the piston rod 8. To ensure this sealing performance, pressure in the chamber 5 is applied to the space of the recess 34, and the lip portions 35 and 36 are urged against the outer peripheral surface of the piston rod 8 and the wall surface of the step portion 32b (the wall surface of the chamber 5). (Because the pressure water acts in the direction of expanding the lip portion 35 and the lip portion 36).

  Thereby, even if the piston rod 8 is shaken (tilted) during the lever operation of the hand pump, the sealing effect is continuously maintained in the penetrating portion 30, so that water leakage from the penetrating portion 30 can be prevented.

  Therefore, loss of the feeding force (push-up force) can be prevented, and the pump performance of the promotion-type hand pump can be improved. In addition, since the structure prevents the water leakage by utilizing the characteristics of the lip portions 35 and 36 of the packing member 33, a simple structure is sufficient. Moreover, it is inexpensive. In particular, when the cross-sectional shape is the Y-shaped packing member 33, stable high followability and stable high sealing performance can be promised.

[Second Embodiment]
FIG. 6 shows a second embodiment of the present invention.

  In this embodiment, a packing member 43 having a U-shaped cross-section is used instead of a Y-shaped packing member. Even if it does in this way, there exists an effect similar to 1st Embodiment.

[Third Embodiment]
FIG. 7 shows a third embodiment of the present invention.

  In the present embodiment, one packing member 33 is not interposed in the penetrating portion 30, but a plurality of, for example, two packing members 33 are arranged in series along the axial direction of the piston rod 8 and penetrated. Part 30 was interposed.

  With such a heavy seal structure, a simple structure can sufficiently exert a sealing effect, which is effective for a promotion-type hand pump having a large push-up capability.

[Fourth Embodiment]
FIG. 8 shows a fourth embodiment of the present invention.

  This embodiment is a modification of the third embodiment, and is not a series of Y-shaped packing members 33 arranged in series, but a plurality of U-shaped packing members 43 (two in FIG. 8), The structure was arranged in series. Even with such a serial seal structure, the same effects as those of the third embodiment can be obtained.

  However, in the second to fourth embodiments, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In addition, this invention is not limited to any embodiment mentioned above, You may implement in various changes within the range which does not deviate from the main point of this invention.

The front view which carried out the cross section which shows the hand pump which concerns on the 1st Embodiment of this invention. Sectional drawing which expands and shows the penetration part of the discharge chamber which a piston rod penetrates in the pump. The front view which carried out the partial cross section of the packing member interposed by the penetration part. The front view for demonstrating the shake of the piston rod which arises during the lever operation of the operation lever of the pump from the upper part to the lower part. The expanded sectional view for demonstrating the state of the penetration part of a discharge chamber when the blurring arises. Sectional drawing which shows the principal part of the 2nd Embodiment of this invention. Sectional drawing which shows the principal part of the 3rd Embodiment of this invention. Sectional drawing which shows the principal part of the 4th Embodiment of this invention. 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, 15 ... Lever member, 17 ... Operation rod, 18 ... Operation lever, 22 ... Link, 30 ... Through part, 33 43 ... packing members, 34 ... annular recesses, 35 ... lip.

Claims (3)

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 disposed in the cylinder through the wall of the discharge chamber;
A piston supported by an end portion of the rod located in the cylinder so as to be reciprocally movable in the cylinder, sucking fluid into the cylinder according to the reciprocating motion, and feeding the fluid into the discharge chamber;
An operation lever that is rotatably supported by the main body so that the tip can swing along the axial direction of the cylinder;
Extending and retracting operation that is pivotally connected between the tip of the operating lever and the end of the piston rod located outside the cylinder, and that is rotated in cooperation with the operating lever. Therefore, a link that conveys the piston rod as a reciprocating linear motion
The end surface has an annular recess along the circumferential direction, and is formed in an annular shape having a lip portion that can be sufficiently deformed in the diameter direction by the recess on the inner peripheral side across the recess. Between the wall surface of the discharge chamber penetrating through and the piston rod, the opening of the recess is directed in the axial direction of the piston rod so that the lip portion is pressed against the outer peripheral surface of the piston rod, A packing pump, comprising: a packing member that seals a gap between the piston rods while allowing the piston rod to be shaken when the rotary motion is converted into the reciprocating linear motion.   The hand pump according to claim 1, wherein the packing member is a packing member having a Y-shaped or U-shaped cross section.   The hand pump according to claim 1 or 2, wherein a plurality of the packing members are arranged in series along the axial direction of the piston rod.

Images