JP2011068380A - Liquid discharge pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid discharge pump which opens a discharge valve 75 by an annular piston D3 relatively elevating with respect to a piston guide D1 when pushing down an operating member D, closes the discharge valve 75 when the operating member D is elevated, abuts and locks the upper portion of the outer circumference of the annular piston D3 on and to a locking step formed at the inner circumference of a cylinder B at the highest elevated position, prevents inconvenience that the operating member is heavily pushed down, and is formed so that its structure is hardly changed in comparison with a conventional one. <P>SOLUTION: A capacity adjusting space 48 which is tightly closed by a variable wall 90 which can restore an lower end opening into a cylinder B is defined in a lower end of a piston guide D1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid discharge pump.

  Various types of liquid discharge pumps have been proposed in which an annular piston is mounted so as to be movable relative to the stem of the operating member. (For example, Patent Document 1)

  The pump described in Patent Document 1 includes an operating member that is mounted on the cylinder so as to be vertically movable in an upwardly biased state, and the operating member is an annular shape in which an outer peripheral edge is slidably fitted to the inner periphery of the cylinder. A piston, a piston guide in which the inner peripheral edge of the annular piston is fitted so as to be movable up and down with a predetermined width, a discharge valve having the annular piston as a discharge valve body, a stem fitted to the upper part of the piston guide, and an upper end of the stem And a discharge head with a nozzle fitted to the nozzle.

  The discharge valve is opened by the annular piston that rises relative to the piston guide when the operating member is pushed down, and the pressurized liquid is discharged from the discharge head at the upper end of the operating member. The discharge valve is closed by the relatively descending annular piston, and the suction valve at the lower end in the cylinder is opened to introduce the liquid in the container into the negative pressure cylinder.

Japanese Patent Laid-Open No. 10-5640

  In the liquid discharge pump of Patent Document 1, since the pump chamber constituted by the annular piston and the cylinder is filled with liquid that is an incompressible fluid, the annular piston is deformed when the discharge bed is pushed down. There is a problem that the valve seat bites into a state where it is difficult to separate, which increases the pressing force of the operating member and makes it impossible to press down.

  The present invention has been made in view of the above points, and in this type of movable valve pump, there is no inconvenience that the push-down of the operating member becomes heavy, and the structure of the pump is not limited to that of the conventional one. An excellent liquid discharge pump that can be formed with very little change is proposed.

  The first means is configured as follows. In other words, an operating member D is mounted so as to be movable up and down in an upwardly biased state with respect to the cylinder B. The operating member D includes an annular piston D3 having an outer peripheral edge slidably fitted to the inner periphery of the cylinder B; The inner peripheral edge of the annular piston D3 is fitted so that it can move up and down with a predetermined width, and the piston guide D1 having a discharge valve seat 42 that forms the discharge valve 75 with the annular piston D3, and the lower part above the piston guide D1 A stem D2 fitted and a discharge head D4 fitted to the upper end of the stem D2 are provided, and the inside and outside of the stem D2 are blocked by an annular piston D3 that rises relative to the piston guide D1 when the operating member D is pushed down. When the discharge valve 75 is opened and the operation member D is raised, the discharge valve 75 is closed by the annular piston D3 that is lowered relative to the piston guide D1, and at the highest rise position of the operation member D, the upper outer periphery of the annular piston D3 is the cylinder B. Set on the inner circumference In the liquid discharge pump that abuts and locks the formed locking step portion, the volume adjustment space 48 that is hermetically closed by a variable wall 90 that can restore the lower end opening into the cylinder B in the lower end portion of the piston guide D1. Was defined.

  The second means is configured as follows. That is, in the first means, the deformable wall 90 is formed as an inversion wall 90a that is inverted up and down.

  The third means was configured as follows. That is, in the first means, the deformable wall 90 is provided with a bottomed cylindrical elastic cylinder capable of elastic deformation in the axial direction extending downward from the lower end edge of the cylinder wall 41 of the piston guide D1. Formed as wall 90b.

  The fourth means is configured as follows. That is, in the first means, the deformable wall 90 extends downward from the lower end edge of the cylinder wall 41 of the piston guide D1, and has a bottomed cylinder provided with a bellows 93 that vertically expands and contracts at least partially. The cylindrical wall 90c is shaped like a tube.

  The fifth means is configured as follows. That is, in any one of the first to fourth means, the piston guide D1 is provided with a raised bottom-like bottom wall 40, and a volume adjusting space 48 is provided in the cylindrical wall 41 below the bottom wall 40. The deformable wall 90 is extended downward from the lower end edge of the fitting cylinder portion 91 that is formed and fixed to the inner periphery of the volume adjusting space 48.

  According to the present invention, when the operating member D is moved up and down, the annular piston D3 is compressed and deformed. As a result, the annular piston D3 and the piston guide D1 or the annular piston D3 and the engaging step portion may be bitten. However, since the deformable wall 90 is deformed by the pressing of the actuating member D and the internal volume of the cylinder B is changed, the biting phenomenon is eliminated and the actuating member D can be easily pushed down, and the pushing down of the actuating member D becomes heavy. There is no inconvenience. In particular, with respect to this effect, even when the annular piston D3 is formed of a relatively soft material such as silicone rubber or soft synthetic resin, it can be sufficiently dealt with. In addition, it has the advantage that such an effect can be formed with a slight structural change even when compared with the conventional product.

  The deformable wall 90 can be formed as an inverted wall 90a that flips up and down, or the deformable wall 90 can be elastically deformed in the axial direction extending downward from the lower end edge of the cylindrical wall 41 of the piston guide D1. A bottomed cylindrical elastic cylindrical wall 90b, or the variable-shaped wall 90 is extended downward from the lower end edge of the cylindrical wall 41 of the piston guide D1, and at least partially provided with a bellows 93 extending vertically. The bottomed cylindrical wall 90c can be formed, or can be formed with various simple structures.

  The piston guide D1 is provided with a raised bottom-like bottom wall 40, the inside of the cylindrical wall 41 below the bottom wall 40 is formed in the volume adjustment space 48, and the lower end of the fitting cylinder portion 91 fitted and fixed to the inner periphery of the volume adjustment space 48 When the variable shape wall 90 is extended below the edge, the volume adjustment space 48 can be formed without providing any extra shape, and a simple assembly operation in which the variable shape wall forming member D5 is fitted and fixed. There is an advantage that can be formed.

It is a longitudinal cross-sectional view of a liquid discharge pump. Example 1 It is an expanded sectional view of a piston guide and a variable shape wall forming member. Example 1 It is an expanded sectional view of a piston guide and a variable shape wall forming member. (Example 2) It is an expanded sectional view of a piston guide and a variable shape wall forming member. Example 3 It is an expanded sectional view of a piston guide and a variable shape wall forming member. (Example 4)

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show an example of the liquid discharge pump 1 attached to the container body 100. FIG. The liquid discharge pump 1 includes a mounting cap A, a cylinder B, a locking member C, and an operating member D.

  The mounting cap A has a flange-like top wall 11 extending from the upper end edge of the peripheral wall 10 screwed to the outer periphery of the mouth-and-neck portion 101 of the container body 100, and a guide tube 12 is erected from the upper surface of the top wall 11. .

  The cylinder B has a cylindrical shape with upper and lower ends opened, and a flange portion 21 extending outward from the upper end edge of the peripheral wall portion 20 is fitted to the back surface of the top wall 11 of the mounting cap A. The suction valve seat 23 is formed at the center of the pipe fitting tube 24, and a pipe fitting cylinder 24 communicating with a valve port defined by the suction valve seat 23 is integrally suspended. Then, the flange portion 21 placed on the upper surface of the mouth / neck portion 101 via the packing p is sandwiched between the upper surface of the mouth / neck portion 101 and the top wall 11 of the mounting cap and is suspended in the container body 100 and attached. ing. A pipe 25 is fitted into the pipe fitting cylinder 24. In addition, a suction valve 27 comprising a suction valve seat 23 and a suction valve body 26 that closes the suction valve seat 23 so as to be openable and closable is provided in the lower part of the cylinder B, and communicates unilaterally from the container 100 to the cylinder B. I am letting.

  The locking member C is provided for the purpose of forming a locking step portion for locking an annular piston, which will be described later, at the highest position of the operating member D. The locking cylinder 30 fitted to the portion is provided, and the upper end of the locking cylinder 30 stands above the inner edge of the top wall 11 of the mounting cap A. An annular protrusion 31 extending outward from the upper outer surface of the locking cylinder 30 is sandwiched between the flange portion 21 of the cylinder B and the top wall 11 of the mounting cap.

  The actuating member D includes a piston guide D1, a stem D2, an annular piston D3, a discharge head D4, and a variable shape wall forming member D5.

  The piston guide D1 has a bottomed cylindrical shape with a raised bottom-shaped bottom wall 40, a flange-shaped discharge valve seat 42 protruding from the lower outer periphery of the cylindrical wall 41, and suspended from the lower surface of the discharge valve seat 42. A plurality of support plates 44 in the circumferential direction are suspended between the provided cylinder portion 43 and the discharge valve seat 42, and an annular guide tube 45 is integrally connected between the lower ends of the support plates 44. A plurality of circumferential ridges 46 are vertically provided on the outer surface of the cylindrical wall 41 below the bottom wall 40. Further, a through-hole 47 for communicating the inside and outside of the cylinder wall 41 is formed in the cylinder wall 41 above the bottom wall 40.

  The stem D2 has a cylindrical shape with the upper and lower ends opened, and the lower end portion is formed into a diameter-expanded portion 61 that is expanded through the projecting plate portion 60, and is formed on the inner periphery of the cylinder wall above the projecting plate portion 60. The upper end of the cylindrical wall 41 of the piston guide D1 is fitted and fixed, and a predetermined cylinder is formed between the enlarged diameter portion 61 and the piston guide D1 between the lower end of the enlarged diameter portion 61 and the discharge valve seat 42. The two are fitted and fixed at intervals.

  The annular piston D3 has an H-shaped cross section, and an annular outer peripheral upper sliding piece 71 is extended from the outer peripheral upper portion of the ring-shaped base 70, and an annular outer peripheral lower sliding piece 72 is integrally extended from the outer peripheral lower portion. An annular inner peripheral upper sliding piece 73 is integrally extended from the inner peripheral upper part, and an annular discharge valve piece 74 is integrally extended from the inner peripheral lower part. Then, the tip edges of the outer peripheral upper slide piece 71 and the outer lower slide piece 72 are fitted to the inner circumference of the cylinder B so as to be capable of liquid-tight sliding, and the tip edge of the inner upper slide piece 73 is expanded to the stem D2. The discharge valve piece 74 is slidably fitted to the inner periphery of the raised portion of the discharge valve seat 42 so as to be slidably fitted to the inner periphery of the diameter portion 61. Then, the discharge valve seat 42 and the discharge valve piece 74 constitute a discharge valve 75, and from the state where the discharge valve 75 is closed, the annular piston D3 rises relative to the stem D2 and the discharge valve 75 opens, and the base 70 The upper and lower surfaces of the annular piston D3 can be moved up and down relative to the piston guide D1 (or the stem D2) until the upper surface of the piston is in contact with and locked to the lower surface of the enlarged diameter portion 61.

  In the discharge head D4, a vertical cylinder 80 fitted to the upper end of the stem D2 is suspended from the back surface of the top plate 81, a peripheral wall portion 82 is suspended from the periphery of the top plate 81, and one end is opened at the top of the vertical cylinder 80. The nozzle 83 passes through the peripheral wall portion 82 and opens outward.

  The actuating member D configured as described above is provided by a coil spring s interposed between the lower surface of each support plate 44 of the piston guide D1 and the upper surface of a plurality of locking ribs projecting in the circumferential direction at the inner peripheral lower portion of the cylinder B. Always biased upward, the outer peripheral upper sliding piece 71 which is the outer peripheral upper end edge of the annular piston D3 is abutted and locked to the locking step formed by the lower surface of the locking cylinder 30 at the highest position. It becomes a state.

  In the present invention, a volume-adjusting space 48 is defined at the lower end of the actuating member D, and a recoverable variable-shaped wall 90 is provided that closes the lower-end opening of the volume-adjusting space 48 using the variable-shaped wall forming member D5. ing. The volume adjustment space 48 uses a space below the bottom wall 40 of the piston guide D1. Further, the deformable wall forming member D5 is configured such that an outward flange 92 extending from the lower end edge of the fitting cylinder portion 91 fitted and fixed to the inner peripheral lower end portion of the piston guide D1 is abutted and fitted to the lower surface of the piston guide D1. A dome-shaped reversal wall 90a that closes the lower end opening of the fitting tube portion 91 is integrally extended as a deformable wall 90. The deformable wall forming member D5 is preferably formed of silicone rubber or soft synthetic resin, but is not limited to this.

  By providing the volume adjusting space 48 and the reversing wall 90a (variable wall 90), when the internal pressure in the pump rises during pump operation and the reversing wall 90a is reversed upward, the balance in the hermetically pressurized cylinder is balanced. It collapses and an air cushion is generated. And since the volume operation member D can operate | move, it seems that the biting phenomenon can be eliminated. Further, the inverted reversal wall 90a is reversed to the downward projecting state by the negative pressure in the cylinder B when the operating member D is raised.

  The operation of the liquid discharge pump 1 configured as described above will be described. In the state shown in FIG. 1, the operating member D is pushed upward by the coil spring s and is in the highest position. At this time, the outer peripheral upper sliding piece 71 which is the outer peripheral upper end edge of the annular piston D3 is the locking cylinder of the locking member C. It is latched by the latching step part comprised by 30 lower surfaces, and the further raise of the operating member D is blocked | prevented. Further, the discharge valve piece 74 is in pressure contact with the discharge valve seat 42, and the discharge valve 75 is closed.

  From this state, when the actuating member D is pushed down against the upward biasing force of the coil spring s, the annular piston D3 descends together with the stem D2, but the cylinder B is compressed and pressurized, so it is relative to the stem D2. As a result, the pressurized liquid that has opened the discharge valve 75 is discharged from the tip of the nozzle 83 through the through hole 47 through the stem D2.

  Next, when the pressing of the operating member D is released, the operating member D rises due to the action of the coil spring s. At that time, since the pressure in the cylinder B becomes negative, the annular piston D3 descends relative to the stem D2 to close the discharge valve 75, and the suction valve 27 opens to allow the liquid in the container body 100 to flow through the pipe 25. Is introduced into the cylinder B via

  FIG. 3 shows another example, in which the inversion wall 90a protrudes in a step shape instead of a dome shape. As described above, the reversing wall 90a can be variously adopted as long as it can be reversed. The other configuration is the same as that of the example of FIG.

  FIG. 4 shows still another example, in which the deformable wall 90 extends downward from the lower end edge of the cylindrical wall 41 of the piston guide D1 and has a bottomed cylindrical elastic cylindrical wall capable of elastic deformation in the axial direction. An example formed as 90b is shown. In this case, when the internal pressure in the pump rises when the pump is operated and the elastic cylindrical wall 90b is elastically deformed inward as shown by the two-dot chain line in FIG. 4, the balance in the hermetically pressurized cylinder is lost. Air cushion is generated. And since the volume operation member D can operate | move, it seems that the biting phenomenon can be eliminated. The elastic cylindrical wall 90b returns to its original state due to its own elastic restoring force and negative pressure in the cylinder B when the operating member D is raised. The other configuration is the same as that of the example of FIG.

  FIG. 5 shows still another example, in which the deformable wall 90 extends downward from the lower end edge of the cylindrical wall 41 of the piston guide D1, and has a bottomed cylindrical shape provided with a bellows 93 that expands and contracts vertically at least partially. The telescopic cylinder wall 90c was formed. In this case, when the internal pressure in the pump rises during pump operation and the bellows 93 part of the telescopic cylinder wall 90c is elastically deformed to contract upward, the balance in the hermetically pressurized cylinder is lost and an air cushion is generated. To do. And since the volume operation member D can operate | move, it seems that the biting phenomenon can be eliminated. The telescopic cylinder wall 90c returns to its original state due to the elastic restoring force of the bellows 93 and the negative pressure in the cylinder B when the actuating member D is raised. The other configuration is the same as that of the example of FIG.

1 ... Liquid discharge pump A ... Installation cap
10 ... peripheral wall, 11 ... top wall, 12 ... guide cylinder B ... cylinder
20 ... peripheral wall part, 21 ... flange part, 22 ... bottom wall part, 23 ... suction valve seat, 24 ... pipe fitting cylinder, 25 ... pipe, 26 ... suction valve body, 27 ... suction valve C ... locking member
30 ... locking cylinder, 31 ... annular projection D ... actuating member
D1 ... Piston guide
40 ... Bottom wall, 41 ... Cylinder wall, 42 ... Discharge valve seat, 43 ... Cylinder part, 44 ... Support plate, 45 ... Ring guide tube, 46 ... Vertical ridge, 47 ... Through hole, 48 ... Volume adjustment space
D2 ... Stem
60 ... Overhang plate part, 61 ... Expanded part
D3 ... Annular piston
70 ... Base, 71 ... Upper outer sliding piece, 72 ... Lower outer sliding piece, 73 ... Inner upper sliding piece,
74 ... Discharge valve piece, 75 ... Discharge valve
D4 ... Discharge head
80 ... Vertical cylinder, 81 ... Top plate, 82 ... Surrounding wall, 83 ... Nozzle
D5… Variable wall forming member
90 ... variable wall, 90a ... reversal wall, 90b ... elastic cylinder wall, 90c ... telescopic cylinder wall,
91 ... Fitting tube, 92 ... Outward flange p ... Packing s ... Coil spring
100 ... Container body
101 ... Mouth and neck

Claims (5)

  An operating member D is mounted on the cylinder B so as to be vertically movable in an upwardly biased state. The operating member D includes an annular piston D3 having an outer peripheral edge slidably fitted on the inner periphery of the cylinder B, and an annular piston. The inner periphery of D3 is fitted so that it can move up and down by a predetermined width, and the piston guide D1 with the discharge valve seat 42 that forms the discharge valve 75 with the annular piston D3, and the lower part are fitted on the upper part of the piston guide D1. Discharge valve having a stem D2 and a discharge head D4 fitted to the upper end of the stem D2, and shutting off the inside and outside of the stem D2 by an annular piston D3 that rises relative to the piston guide D1 when the operating member D is pushed down When the operating member D is raised, the discharge valve 75 is closed by the annular piston D3 that descends relative to the piston guide D1. When the operating member D is at the highest position, the upper outer periphery of the annular piston D3 is the inner circumference of the cylinder B. Provided in In the liquid discharge pump that contacts and locks the locking step portion, a volume adjustment space 48 that is hermetically closed by a deformable wall 90 that can restore the lower end opening into the cylinder B is defined in the lower end portion of the piston guide D1. A liquid discharge pump characterized by being made.   The liquid discharge pump according to claim 1, wherein the deformable wall 90 is formed as an inversion wall 90 a that inverts up and down.   2. The liquid discharge according to claim 1, wherein the deformable wall 90 is formed as a bottomed cylindrical elastic cylindrical wall 90b that extends downward from the lower end edge of the cylindrical wall of the piston guide D1 and can be elastically deformed in the axial direction. pump.   The deformable wall 90 is formed as a bottomed cylindrical expansion / contraction cylinder wall 90c that extends downward from the lower end edge of the cylinder wall of the piston guide D1 and has a bellows 93 that expands and contracts vertically at least partially. The liquid discharge pump as described.   The piston guide D1 is provided with a raised bottom-like bottom wall 40, the inside of the cylindrical wall 41 below the bottom wall 40 is formed in the volume adjustment space 48, and the lower end of the fitting cylinder portion 91 fitted and fixed to the inner periphery of the volume adjustment space 48 The liquid discharge pump according to any one of claims 1 to 4, wherein the deformable wall 90 is extended downward from the edge.

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