JP3668800B2 - Liquid jet pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid jet pump.
[0002]
[Prior art]
As a liquid ejection pump, a fixed suction part that fixes a cylinder with a suction valve in a state where the lower end is suspended in the container body by a mounting cap fitted to the outer periphery of the container body neck and neck, and can move up and down on the inner periphery of the cylinder The upper end of the stem, which is linked to the lower part of the outer periphery of the fitted annular piston, protrudes upward from the center opening at the center of the upper end of the fixed suction part so that it can be moved up and down. It is generally known that the apparatus includes a jet part, and is configured to suck up the liquid in the container body by the vertical movement of the movable jet part and eject the liquid from the jet port of the head.
[0003]
In the conventional pump of this type, a metal coil spring is generally used to urge the movable ejection portion upward. In the case of using this metal coil spring, the liquid can be smoothly poured out with a good return function. However, in recent waste disposal circumstances, separation of metal and plastic is not possible. In the conventional one, this separation has been extremely difficult due to the fact that the metal parts are fine and sealed inside.
[0004]
In consideration of such circumstances, attempts have been made to change the coil spring from metal to plastic, but plastic is generally inferior in durability and elastic restoring force compared to metal. Therefore, when trying to obtain a restoring force similar to that of a metal one, its diameter and thickness must be increased, which greatly affects the form or size of the pump as a whole, and the material of the coil spring is simply changed. Replacing it is not practical.
[0005]
In addition, the conventional suction valve in this type of pump is generally constructed by placing a metal ball valve on a valve seat provided at the lower end of the cylinder. In order to eliminate the inconvenience that the liquid remaining in the nozzle hangs down from the tip or the liquid remaining at the tip in the nozzle dries and solidifies, the ball valve body of the suction valve is relatively weak in elasticity. There has also been proposed a coiled metal auxiliary spring that is pressed onto the valve seat.
[0006]
These are configured, for example, by pressing and locking the lower end of an auxiliary spring whose upper end is locked to a cylindrical member provided in the lower part of the cylinder to the upper surface of the ball-shaped valve body. The cylindrical member has a cylindrical shape with an opening at the lower end surface, and a flange projecting from the lower part of the outer surface of the cylinder wall is mounted on a plurality of circumferentially projecting ribs at the lower end of the inner surface of the cylinder, and is movable on the upper surface of the flange. The lower end of the coil spring for urging the jetting part upward is pressed and locked, and a window hole is formed in the cylinder wall for circulating the liquid. A bar-like protrusion for restricting the movement is provided vertically.
[0007]
With the above configuration, when the movable ejection part after liquid ejection rises, the suction valve is not opened by the action of the auxiliary spring until the opened discharge valve is closed, and as a result, the liquid in the nozzle enters the cylinder. It is possible to prevent liquid dripping by flowing back.
[0008]
Even with such a suction valve, it is difficult to separate the ball-shaped valve body and the auxiliary spring for the same reason as described above, and the assembly operation is troublesome. That is, when assembling, the ball-shaped valve body is first mounted, and then the coil spring and the cylindrical member are sequentially mounted, or the cylindrical member that locks the coil spring is mounted after the ball-shaped valve body is mounted. doing. Therefore, each member must be mounted separately, which complicates the work, and there is a risk of inconvenience such as the coil spring contacting the lower surface of the upper surface of the ball-shaped valve body. There was a possibility of causing.
[0009]
[Problems to be solved by the invention]
In view of the above-described points, the present invention does not require a metal coil spring and does not require separation of the portion, and maintains a sufficient elastic force to smoothly move the movable ejecting portion up and down. The present invention proposes an excellent pump that has the advantage that it can be manufactured at low cost without significant structural changes as compared with this type of conventional pump.
[0010]
In addition, the suction valve part does not use a metal member, and there is no dripping, can prevent the liquid from drying and solidifying, can be assembled easily and reliably during assembly, and is good for a long time. A pump capable of maintaining the valve function is proposed.
[0011]
[Means for Solving the Problems]
As a first means, the cylinder 2 with the suction valve 6 fixed in a state where the lower end is suspended in the container body by the mounting cylinder 9 fitted to the outer periphery of the container mouth neck, and fitted to the upper part of the inner surface of the cylinder. An annular piston 25 protrudes from the lower outer periphery of the support cylinder 24 whose outer surface is fitted to the inner surface of the guide cylinder 19 so that it cannot rotate and can be pushed down, and the piston can slide down on the inner surface of the cylinder 2 below the guide cylinder 19 And a synthetic resin coil spring 28 that supports the member, and a lower outer surface of the support cylinder 24 that can be screwed down so that the upper end protrudes upward from the cylinder. In addition, the seal surface a at the upper end of the inner surface of the support cylinder 24 is configured to be fluid-tightly slidable on the upper outer surface of the screwed portion, and the discharge valve 32 is provided inside, and the stem 4 is fitted to the upper end of the stem. And a pressing head 5 The annular piston 25 can be pushed down against the elastic force of the coil spring 28 by pushing down the head, and the stem can be lowered with respect to the support tube by turning the head .
[0012]
As a second means, in the first means, the suction valve 6 is provided with a valve plate 14 by means of an elastic connecting piece 13 protruding in the circumferential direction from the inner surface of the annular base 12 fitted to the lower end of the cylinder. The suction valve 6 is configured to support and to close the suction valve hole 15 at the lower end portion of the cylinder 2 by the valve plate so as to be openable and closable. When the stem 4 is screwed and lowered with respect to the support cylinder 24, the lower end of each elastic plate 31 is configured to be in pressure contact with the upper surface of the valve plate 14 .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in the drawings, the liquid jet pump 1 of the present invention includes a cylinder 2, a piston member 3, a stem 4, and a push-down head 5 as main members.
[0014]
The cylinder 2 has a cylindrical shape with an upper end opening provided with a suction valve 6 at the inner lower end, and is fixed in a state where the lower end is suspended into the container body by a mounting cylinder 9 fitted to the outer periphery of the mouth neck portion 8 of the container body 7. In this embodiment, a flange 10 protruding from the upper part of the outer surface is placed on the upper surface of the mouth / neck portion 8 of the container body 7 through a packing or the like, and the upper surface of the flange 10 is screwed to the outer periphery of the container body neck portion. It is configured to be fixed by pressure contact with a flange 11 extending inward from the upper end edge of the mounting cylinder 9 fitted in step (b).
[0015]
Further, the suction valve 6 in this embodiment supports the valve plate 14 by a plurality of elastic connecting pieces 13 protruding in the circumferential direction from the inner surface of the annular base 12 fitted to the lower end of the cylinder, and the valve plate Thus, a valve member 16 for closing the suction valve hole 15 at the lower end of the cylinder 2 so as to be openable and closable is provided. The annular base 12 has a ring shape and is fitted and fixed to the lower end of the inner surface of the cylinder 2. Further, the elastic connecting piece 13 connects one end to the inner surface of the annular base portion 12 and extends in an arc shape along the annular base portion 12 toward the center, and forms a deformed rod shape extending toward the center again, and the circular valve plate 14 The other end is integrally connected to the outer surface, and the valve plate 14 is supported on the upper surface of the bottom wall of the peripheral edge of the valve hole.
[0016]
Further, an upper end is fitted into a fitting cylinder 17 suspended from the lower surface of the cylinder 2 around the suction valve hole 15, and a pipe 18 is attached, and the lower end is suspended below the container body.
[0017]
In the present invention, a guide cylinder 19 provided mainly for guiding the vertical movement of the piston member 3 is fitted to the upper end of the inner surface of the cylinder 2. In this embodiment, the guide cylinder 19 is configured as a part of the ring cap 20 fitted to the upper end of the cylinder 2. The ring cap 20 has a flange-shaped top plate 22 extending inwardly from the upper end edge of the fitting tube 21 fitted to the upper end of the outer surface of the cylinder 2, and the guide tube 19 suspended from the inner lower surface of the top plate 22. Is fitted to the upper end of the inner surface of the cylinder 2. The guide tube 19 has an outer surface upper end portion and a cylinder inner surface upper end portion provided with a rotation prevention mechanism A by mutual engagement of the vertical ridges, and the guide tube 19 inner surface has a large number of vertical ridges 23 penetrating vertically. It is installed vertically.
[0018]
The piston member 3 has an annular piston 25 projecting from the lower part of the outer periphery of the support cylinder 24 which is fitted to the inner surface of the guide cylinder 19 so as not to rotate and can be pushed down, and the annular piston 25 is connected to the upper part of the inner surface of the cylinder 2 below the guide cylinder 19. It is configured to be fitted so that it can slide down.
[0019]
In this embodiment, a large number of circumferential ridges 26 are provided on the outer surface of the support cylinder 24 projecting the annular piston 25 from the lower part of the outer surface, and are engaged with the longitudinal ridges 23 of the guide cylinder 19. It is configured such that it cannot be rotated in the horizontal direction and can be pushed downward. Further, a thread 27 is engraved except for the upper end of the inner surface of the support cylinder 24, and the upper end of the inner surface above the thread is configured as a seal surface a that slides fluidly with the outer surface of the stem.
[0020]
The piston member 3 is supported by a coil spring 28 made of synthetic resin. In this embodiment, a coil spring 28 is interposed between the upper surface of the annular base 12 of the valve member 16 and the lower surface of the base end of the annular piston 25. The coil spring 28 can be kept in a state where little or no compression load is applied when the piston member 3 is at the highest position. The coil spring 28 can be formed integrally with the valve member 16.
[0021]
The stem 4 is a conduit for transferring the liquid in the cylinder 2 to the upper push-down head. The lower end of the outer surface is screwed onto the inner surface of the support cylinder 24 so as to be able to be lowered. A seal surface a at the upper end of the inner surface of the support cylinder 24 is configured to be liquid-tightly slidable on the outer surface above the wearing portion.
[0022]
In this embodiment, a cylindrical shape having upper and lower ends opened, and a thread 29 that is screwed with the thread 27 on the inner surface of the support cylinder 24 is formed on the outer periphery of the lower portion, and a flange that protrudes outward from the lower end of the outer surface. The upper surface of 30 is brought into contact with the lower surface of the support cylinder 24 to prevent it from coming out. Further, a plurality of circumferential elastic plates 31 are integrally provided below the lower surface. A plurality of elastic plates 31 are provided vertically below the lower surface of the stem 4 at equal intervals in the circumferential direction, and have a vertically long plate shape with a circular cross section. The lower end of each elastic plate 31 is configured to be pressed and locked to the peripheral edge of the upper surface of the valve plate 14 when the stem 4 is screwed down.
[0023]
A discharge valve 32 is provided at the upper end of the stem 4. In the present embodiment, the discharge valve 32 is provided with a valve body 33 in which a rod-like portion is suspended from the center of the lower surface of a conical portion that is closed by contacting the upper portion of the outer periphery with the upper surface of the tapered valve seat formed on the upper surface of the stem. It is constituted by.
[0024]
The push-down head 5 includes a vertical cylinder 34 having a lower portion fitted to the upper end of the outer periphery of the stem 4, and a nozzle 35 having a base end opened at the upper front surface of the vertical cylinder and protruding forward. A flow path is formed from the nozzle through the vertical cylinder to the nozzle outlet.
[0025]
Then, by depressing the depressing head 5, the annular piston 25 is depressed against the elastic force of the coil spring 28 to pressurize the inside of the cylinder 2, and by rotating the head 5, the stem 4 is The pump is lowered with respect to the support cylinder 24, so that the entire pump can be configured compactly, and at this time, the lower end of each elastic plate 31 is configured to be pressed and locked to the peripheral edge of the upper surface of the valve plate 14.
[0026]
The case where the pump configured as described above is used will be described. During transportation and storage, the stem 4 is locked in a state where it is screwed down as shown in FIG.
[0027]
When in use, the stem 4 is screwed up, and then the initial operation of moving the push-down head up and down several times is performed to introduce the liquid in the container into the cylinder. When the head 5 is pressed from this state, the cylinder is pressurized. Then, the pressurized liquid opens the discharge valve 32 and is ejected from the tip ejection port of the nozzle 35 of the head. Next, when the pressing of the head is released, the piston 25 is lifted by the action of the coil spring, and the inside of the cylinder 2 becomes negative pressure. At this time, the discharge valve 32 is open at the beginning of the negative pressure, and the suction valve 6 is not opened by the supporting force of each elastic connecting piece 13, and as a result, the residual liquid in the nozzle 35 flows backward. When the discharge valve 32 is closed, the suction valve 6 opens against the urging force of each elastic connecting piece 13 and the liquid in the container body 7 is introduced into the cylinder 2 through the pipe 18.
[0028]
In each of the above embodiments, each member can be formed of a synthetic resin, and an elastomer or the like can be used in combination as necessary.
[0029]
【The invention's effect】
As described above, the pump according to the present invention is configured as described above, and in particular, the piston member formed by projecting the annular piston that fits into the cylinder inner surface from the lower part of the outer surface of the support cylinder is supported by the coil spring made of synthetic resin. In addition, since the stem can be lowered with respect to the support tube by rotating the push-down head, the metal coil spring is not used, so that separation of the portion is not required, and the product is made of synthetic resin. It is possible to prevent unnecessary compression load from being applied to the coil spring as much as possible to maintain a sufficient elastic force and to smoothly move the piston and the like up and down.
[0030]
Compared with this type of conventional pump, it is only necessary to change a part of the structure, and it has an advantage that it can be manufactured at a low cost without a large structural change.
[0031]
Further, in the second means, in addition to the above effects, the suction valve portion does not use a metal member, so there is no need to separate the portion, and dripping and drying and solidification of the liquid can be prevented.・ Easy and reliable assembly during assembly. Furthermore, if the movable ejection part is pushed down and locked during storage and transportation, the valve plate is pressed against the top surface of the cylinder bottom wall by each elastic plate, and a pump is installed. Even if the container is placed on its side, there is no inconvenience that the elastic connecting piece remains extended due to its hydraulic pressure, and the elastic connecting piece is loaded as little as possible when it is unnecessary. despite using a resin of the valve member, in which a long period of time can be maintained a good valve function.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing an embodiment of the pump of the present invention.
FIG. 2 is a half sectional view showing a state in which the stem of the embodiment is screwed down.
[Explanation of symbols]
2 ... cylinder, 3 ... piston member, 4 ... stem, 5 ... push-down head,
6 ... Suction valve, 9 ... Installation cylinder, 12 ... Annular base, 13 ... Elastic connecting piece, 14 ... Valve plate,
15 ... Suction valve hole, 16 ... Valve member, 24 ... Support cylinder, 25 ... Ring piston,
28 ... coil spring, 31 ... elastic connecting piece, 32 ... discharge valve, a ... seal surface

Claims (1)

  A plurality of circumferential projections from the inner surface of the annular base 12 fitted to the cylinder 2 fixed to the lower end of the cylinder 2 and the cylinder 2 fixed in a state where the lower end is suspended in the container by the mounting cylinder 9 fitted to the outer periphery of the container body neck A suction valve 6 configured to support the valve plate 14 by the elastic connecting piece 13 and to close the suction valve hole 15 at the lower end of the cylinder 2 by the valve plate 14 so as to be openable and closable; An annular piston 25 protrudes from the lower outer periphery of the support cylinder 24 in which the outer surface is fitted to the inner surface of the guide cylinder 19 fitted to the upper portion so as not to rotate and can be pushed down. A piston member 3 that is slidably fitted to the upper part, a synthetic resin coil spring 28 that supports the member, and a cylinder having an outer lower part screwed onto the inner surface of the support cylinder 24 so as to be able to be lowered. Let the upper end protrude upward In addition, the seal surface a at the upper end of the inner surface of the support cylinder 24 is configured to be fluid-tightly slidable on the outer surface above the screwed portion, and the discharge valve 32 is provided inside, and the stem 4 is fitted to the upper end of the stem. And the push-down head 5 is configured so that the annular piston 25 can be pushed down against the elastic force of the coil spring 28 by pushing down the head, and the stem 4 can be screwed onto the support cylinder 24 by turning the push-down head 5. When the stem 4 is screwed down with respect to the support cylinder 24, the lower ends of a plurality of elastic plates 31 vertically spaced from the lower surface of the stem 4 are spaced apart from the valve plate. 14. A liquid jet pump characterized by being configured to be in pressure contact with the upper surface.

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