JP5840974B2 - Pump device - Google Patents

Description

  The present invention relates to a pump device, and more particularly to a pump device having a so-called back suction effect that does not cause dripping after a fluid is discharged.

  For example, Patent Document 1 discloses as “a novel pump capable of drawing the fluid remaining in the discharge path due to the back suction effect into the pump passage and / or the cylinder” (see paragraph No. 0006 of Patent Document 1). , "... a pump with a base cap, a cylinder, a slider, and a head, and a valve element is disposed in a through passage of the slider, Between the through passage and the valve body, the operation of the valve body is delayed until the through passage is closed, and the liquid remaining up to the nozzle from the valve body is drawn into the through passage and / or the cylinder. There is described a “liquid discharge pump characterized by forming a very small gap” (see claim 1 of Patent Document 1).

  This Patent Document 1 states that “when the pressure on the pressing head 5 is pressed down most and the load on the pressing head 5 is released, the pressing head 5 returns to the initial position by the elastic force of the elastic member 6 as described above. At this time, the valve body 7 in a floating state falls, and the region from the outlet side of the valve body 7 to the nozzle (discharge path) until the valve body 7 is seated on the valve seat 3b. The liquid remaining in () is drawn into the through-passage 3a and / or the cylinder 2 by the back suction effect (see paragraph 0015). From the above description in Patent Document 1, the liquid discharge pump described in Patent Document 1 is designed to exhibit a back suction effect when the floating valve body falls.

  As another example, Patent Document 2 discloses that “a pump that can prevent liquid remaining in the nozzle portion and also prevent dripping due to temperature change” (see Paragraph 0009 of Patent Document 2). As a "... pump body, ... piston, ... nozzle part, ... suction valve, ... discharge valve, ... the first spring member, ... When the piston moves in the expansion direction to the suction valve, the suction valve is kept closed until the discharge valve is completely closed, and the liquid remaining in the nozzle portion is returned to the pump chamber, and The second spring member for urging the valve body of the suction valve against the valve seat is provided in order to keep the suction valve closed against the increase in internal pressure in the container due to temperature change. "Pump" is described (see claim 1 of Patent Document 2).

JP 2003-137329 A Japanese Patent Laid-Open No. 7-96956

  The problem to be solved by the present invention is to provide a pump device that exhibits the back suction effect by utilizing the action of the urging member.

Means for solving the problems are as follows:
A pump device including a pump body, a piston, an operation button, an urging member, a suction valve, and a discharge valve;
The pump body is mounted on a mounting opening of a container body that stores fluid, and has a pump chamber that can store the fluid inside and includes a suction through hole communicating with the container body.
The piston has a suction opening that communicates with the pump chamber at one end and a cylindrical body that has a discharge opening that discharges fluid at the other end, and increases the volume of the pump chamber. Or, the piston itself is reciprocally inserted into the pump chamber so as to decrease, and the outer peripheral surface in the vicinity of the discharge opening in the piston has a convex portion protruding from the outer peripheral surface,
The operation button is attached to the pump body, and communicates the nozzle opening for discharging the fluid, the nozzle opening and the piston discharge opening, and the fluid flows from the discharge opening to the nozzle opening. A flow path formed so as to circulate, and an inner cylindrical portion that accommodates the piston so that the vicinity of the end of the piston including the discharge opening is a double tube having the piston as an inner tube, An engagement portion that is provided on an inner peripheral surface of the inner cylindrical portion near the discharge opening and engages with the convex portion, and contacts the end surface of the discharge opening when the piston is moved up and down. When the piston is not moved up and down, it has a stopper arranged to face the end face of the discharge opening with a predetermined gap,
The urging member is disposed between the pump body and the operation button so as to urge the operation button in a direction in which the operation button rises with respect to the pump body,
The suction valve is disposed in the pump chamber, the discharge valve is disposed in the piston, and when the volume of the pump chamber decreases due to the forward movement of the piston, the suction valve closes the suction through-hole and the discharge valve is connected to the pump chamber and the piston. When the volume of the pump chamber increases due to the backward movement of the piston, the suction valve releases the suction through-hole and the discharge valve closes the communication between the pump chamber and the piston. about,
It is a pump device characterized by this.

Also, in the pump device according to a preferred aspect of the present invention, the piston has an insertion opening in which one end portion having a discharge opening portion is inserted into the inner cylindrical portion and the other end portion is provided in the pump body. A cylindrical first stem that is reciprocally mounted on the part, and one end is inserted into the other end of the first stem, and the other end slides liquid-tightly on the inner wall of the pump chamber. A disc body having a communication hole for communicating between the pump chamber and the outside of the pump chamber, and a peripheral surface between the other end portion and one end portion, the inner and outer through holes provided on the peripheral surface in the vicinity of the disc body. A cylindrical second stem having
The discharge valve is a peripheral side surface of the second stem in the vicinity of the disk body, and is disposed so as to cover the inner and outer through holes. When the piston moves forward, the communication hole moves from the communication hole to the inner and outer through holes. The fluid is allowed to flow, and when the piston moves backward, the fluid cannot flow from the inner and outer through holes to the communication hole.

  The pump device of the present invention acts as follows and can exhibit the dripping prevention effect.

  In this pump apparatus until it is used for the first time after shipment, the fluid is stored in the container body. When the operation button is pushed down against the urging force of the urging member and then the operation button is released and the operation button is pushed up according to the urging force several times, the fluid in the container body becomes the pump chamber, The fluid is filled into the inside of the cylindrical body of the piston and the flow path of the operation button.

  The pump chamber, the inside of the cylindrical body, and the flow path are filled with or filled with fluid, and the operation button receiving the push-up force by the urging force of the urging member is engaged with the pump main body so that the operation button is engaged. The state where the operation button does not move away from the pump body is defined as the initial state. In this initial state, although the operation button is urged away from the pump body by the urging member, the operation button is engaged so as not to be detached from the pump body, and the stopper in the operation button And the upper end surface of the discharge opening of the piston maintain a predetermined gap, in other words, a predetermined space volume is maintained between the stopper in the operation button and the upper end surface of the discharge opening of the piston, and is formed on the outer peripheral surface of the piston. The raised convex portion and the engaging portion provided on the inner peripheral surface of the inner cylindrical portion are engaged with each other.

  In the pump device in this initial state, when the operation button is pushed down against the urging force of the urging member, a stopper provided on the operation button comes into contact with the end surface of the discharge opening of the piston.

  When the operation button is further pressed down while the stopper is in contact with the end face of the discharge opening, the piston is lowered, and the convex portion of the piston is disengaged from the engaging portion of the cylindrical body. As the piston moves away from the engagement portion, that is, as the piston descends, the volume in the pump chamber decreases. As the volume in the pump chamber decreases, the suction valve closes the suction through-hole and the discharge valve communicates and releases the pump chamber and the piston. In the initial state, the fluid filled in the pump chamber, the inside of the cylindrical body, and the flow path is discharged from the nozzle opening as the volume in the pump chamber decreases as the operation button is lowered.

  When the operation button is fully depressed, the stopper is still in contact with the end face of the discharge opening.

  Release the force to push down the operation button after the operation button is fully depressed. When the pressing force is released, the operation button starts to rise by the urging force of the urging member. While the operation button is raised, since the piston is not subjected to the urging force by the urging member, the piston stops its movement and remains stationary. When the operation button starts to rise by the urging force of the urging member, the stopper is detached from the end face of the discharge opening, and the cylindrical body is raised as the operation button is raised. When the cylindrical body continues to rise, the engaging portion in the cylindrical body finally engages with the convex portion of the piston.

  When the engaging portion and the convex portion are engaged, the stopper is located at a position facing the end face of the discharge opening with a predetermined gap from the end face of the discharge opening of the piston.

  Since the piston does not move during the period from when the operation button starts to rise until the convex portion engages with the engaging portion, the volume in the pump chamber does not increase, and the operation button is fully depressed. The volume in the pump chamber is maintained. Therefore, the suction valve remains closing the suction through hole, while the discharge valve keeps the communication between the pump chamber and the piston open.

  As the lowered operating button begins to rise, the overall volume formed by the pump chamber, the internal volume of the piston and the flow path in the operating button increases. The increase in the total volume is based on an increase in the flow path at the operation button. When the total volume increases, the inside of the flow path becomes negative due to the increase in the volume of the flow path at the operation button.

  When the pressure in the flow path becomes negative, for example, the fluid filled up to the nozzle opening is drawn into the flow path, and the fluid is prevented from overflowing outside the nozzle opening. That is, dripping from the nozzle opening is prevented.

  When the operation button is further raised by the urging force of the urging member, the piston starts to rise because the engagement portion and the convex portion are engaged. When the piston starts to rise, the discharge valve closes and the volume of the pump chamber starts to increase. When the volume of the pump chamber increases, the pressure in the pump chamber becomes negative. Therefore, the suction valve releases the suction through-hole and the discharge valve closes the communication between the pump chamber and the piston. The flowing fluid flows into the pump chamber through the suction through hole.

  When the operation button is further raised and the operation button is engaged with the pump body, the operation button stops rising and returns to the initial state.

  Therefore, according to this invention, there exists a technical effect of providing the pump apparatus with a simple apparatus structure which can prevent dripping.

FIG. 1 is an example of the present invention and is a sectional view showing a pump device in an initial state. FIG. 2 is a schematic cross-sectional view showing a first stem in a pump device which is an example of the present invention. FIG. 3 is a schematic cross-sectional view showing the operation buttons in the pump device which is an example of the present invention. FIG. 4 is a cross-sectional view showing a pump device that is an example of the present invention and in which the operation buttons are fully lowered. FIG. 5 is a schematic partial cross-sectional view showing a discharge valve and its periphery in a pump device which is an example of the present invention.

  The fluid discharge pump of the present invention includes a container body, a pump body, and an urging member.

  A container main body is a container which can store a fluid. The container body is usually formed of a synthetic resin, glass, or the like.

  As the fluid, for example, a fluid having medium to high viscosity such as a hair washing agent or cosmetic can be cited as a suitable example. This is because, among the fluids contained in the container main body, it is the fluid having medium and high viscosity that is liable to cause dripping upon discharge. Here, a fluid having a viscosity of about 10,000 to 100,000 Pa · s can be mentioned as the fluid having a medium to high viscosity. In the present invention, the fluid is not limited to the above-described hair wash or cosmetics, but may be various liquids, emulsions, slurries, and the like.

  The container body has a mounting opening. A pump body is mounted in the mounting opening, and the pump body can be removed from the mounting opening when the container body is replenished with fluid and filled. There is no particular limitation on the structure for attaching the pump body to the container body.

  The pump body includes a pump chamber.

  This pump chamber has a suction through-hole through which the pump chamber and the container main body communicate, and the suction valve and the discharge valve cooperate to increase or decrease the internal volume of the pump chamber by the movement of the piston. The fluid stored in is pumped into the pump chamber from the container body, and the fluid in the pump chamber is discharged out of the pump chamber.

  The pump main body may be an assembly composed of a plurality of parts, or may be an integrated body formed by integral molding.

  The piston is formed in a cylindrical body as a whole, and has one end having a suction opening communicating with the pump chamber and the other end having a discharge opening for discharging the fluid, and suctions the fluid in the pump chamber. It is formed so that the fluid can be sucked into the cylindrical body from the portion and the fluid in the cylindrical body can be discharged from the discharge opening. This piston is inserted into the pump chamber and is mounted on the pump body so as to be able to reciprocate in the pump chamber. When a part of the piston enters the pump chamber, the volume in the pump chamber decreases. When the piston moves so that the piston inserted in the pump chamber is pulled out of the pump chamber, the volume in the pump chamber increases.

  The piston has a convex portion protruding from the outer peripheral surface on the outer peripheral surface in the vicinity of the end provided with the discharge opening. This convex part is a part of the piston. If the piston is made of synthetic resin, the piston with the convex part can be obtained by integral molding. In addition, it is possible to obtain a piston having a convex portion by forming the convex portion and the piston separately and then attaching the convex portion to the piston.

  This convex part should just be the structure which can be engaged with the engaging part in an operation button. A preferable convex portion is an annular convex portion that protrudes so as to form an annular shape around the central axis of the piston on the outer peripheral surface of the piston and in the vicinity of the end provided with the discharge opening. is there. The cross-sectional shape of this annular convex part, that is, the cross-sectional shape that appears by cutting the annular convex part in the plane passing through the central axis of the piston is a square, a rectangle, a triangle, a normal distribution curve with a high height, A low normal distribution curve shape, a mountain shape, or the like may be used. In addition to the preferred convex portion, the pump device has various shapes that can be effectively engaged with the engaging portion without being formed in the annular body centered on the central axis of the piston. It can be adopted according to. This piston can usually be formed of a synthetic resin.

  The piston can be formed as an assembly in which a plurality of members are combined, and can be formed as an integrated body by integral molding.

  The operation button is attached to the attachment opening. Preferably, the operation button is attached to the attachment opening together with the pump body, and the operation button is fixed to the pump body and the container body by being attached.

  This operation button has a nozzle opening, a flow path, an inner cylindrical portion, and a stopper, is mounted on the mounting opening of the container body, and reciprocates along the axial direction of the operation button. It is comprised so that a fluid can be discharged from a nozzle opening part. The movement of the operation button toward the pump body can be referred to as “forward movement”, and the movement of the operation button away from the pump body can be referred to as “return movement”. This operation button is formed to be reciprocable with respect to the pump body.

  The nozzle opening is an opening for discharging a fluid.

  The flow path is a space through which a fluid flows from the discharge opening of the piston to the nozzle opening when the pump body with the piston and the operation button are mounted in the mounting opening.

  The inner cylindrical portion is a cylindrical body that is integrated as a part of the operation button. This inner cylindrical portion is formed from a discharge opening provided at the end opposite to the end on the pump chamber side of the piston, which is inserted into the pump chamber in the pump main body mounted in the mounting opening of the container main body. The piston is accommodated in the inner cylindrical portion. That is, the inner cylindrical portion accommodates a part of the piston, that is, accommodates a part of the piston by a predetermined axial length from the end of the piston on the discharge opening side. How much the inner cylindrical portion accommodates the piston in the axial direction is a matter that is appropriately determined according to the scale, application, and the like of the pump device. When this inner cylindrical part accommodates a part of the piston, a double pipe is formed by the accommodated piston and the inner cylindrical part.

  This inner cylindrical part has an engaging part. Moreover, it is preferable that this inner cylindrical part is closely provided with an inner peripheral surface.

  The close inner peripheral surface is in close contact with the outer peripheral surface of the piston accommodated in the inner cylindrical portion, so that the fluid present in the flow path is formed between the inner peripheral surface of the inner cylindrical portion and the outer peripheral surface of the piston. Prevent leakage from outside to outside of the inner cylindrical part. This close inner peripheral surface is usually formed on the inner peripheral surface of the inner cylindrical portion from one end of the piston having the discharge opening to a predetermined length along the axial direction. Furthermore, on the inner peripheral surface of the inner cylindrical portion that accommodates the piston, the inner peripheral surface from the end surface position of the discharge opening of the piston to a predetermined length in the axial direction is the closely inner peripheral surface. The predetermined length in the axial direction is appropriately determined depending on the scale and application of the pump device.

  The engaging portion is formed so as to be able to engage with a convex portion of the piston. A suitable engaging part is an annular engaging part protruding in an annular shape on the inner peripheral surface of the inner cylindrical part. However, even if the engaging portion is not formed in the annular engaging portion, it may be in a form that can engage with the convex portion, and is square in the cross section that appears by cutting along the plane including the axis of the inner cylindrical portion. , A rectangular shape, a large or low normal distribution curve shape, a mountain shape, or the like.

  This inner cylindrical portion is usually formed of a synthetic resin.

  The stopper is integrally formed as a part of the operation button. When the pump body is formed in a state in which the pump body and the operation button are mounted in the mounting opening of the container body and the container body, the pump body, and the operation button are integrally coupled, the flow path in the operation button In the inside, it arrange | positions so that it may oppose with a predetermined clearance gap at the one end surface of the piston which has the discharge opening part in the mounted piston. The stopper has a function of pushing down the piston while contacting the one end surface of the piston with the discharge opening and contacting the one end surface of the piston by the forward movement of the operation button. In the initial state of the pump device, the stopper discharges the piston. A predetermined space is formed by having a predetermined distance between one end surface having the opening and the end surface facing the piston of the stopper.

  The pump device is provided with appropriate detachment preventing means so that the operation button is not detached from the pump body by an artificial external force or an external force generated by a fall, fall or the like.

  The nozzle opening, the flow path, the inner cylindrical part having the engaging part on the inner peripheral surface, and the operation button having the stopper can be manufactured by integral molding with a synthetic resin. Moreover, an operation button can also be manufactured as an assembly which has a nozzle opening part, a flow path, the inner side cylindrical part which has an engaging part in an internal peripheral surface, and a stopper by assembling a some component.

  The urging member has a function of urging the operation button away from the pump body, and is usually formed by a helical coil. In order to exhibit the function, as an attached state of the urging member, for example, one end of the urging member is in contact with the pump body, and the other end of the urging member is in contact with the operation button. The urging force by the urging member acts so that the operation button is separated from the pump body. However, since the appropriate separation preventing means is incorporated in this pump device, in the pump device according to the present invention, it is possible to apply the urging force by the urging member, or the above-described artificial external force or the above-mentioned fall, fall, etc. The operation button is structured so as not to be detached from the pump body by the generated external force.

  The disengagement prevention means includes a function of preventing the operation button from being disengaged from the pump body by the urging force of the urging member as described above, and an end surface including the discharge opening of the piston and the stopper in the pump device according to the present invention. And a function of preventing the predetermined gap from further expanding beyond the gap dimension.

  The suction valve is not limited in its form as long as it has a function of opening and closing a suction through hole that is disposed in the pump chamber and is provided in the pump chamber and communicates the pump chamber and the container body. The discharge valve is provided in the piston, and exhibits a function of allowing the fluid in the pump chamber to flow into the piston and preventing the fluid in the piston from flowing back into the pump chamber.

  About the effect | action of the pump apparatus which concerns on this invention, it is as having demonstrated in the effect column of invention.

  As shown in FIG. 1, a pump device 1 according to an embodiment of the present invention includes a pump body 2, an operation button 3, a piston 4, and an urging member that are mounted in a mounting opening of a container body (not shown). A coil spring 5, a suction valve 6, and a discharge valve 7. The coil spring is also referred to as a helical coil. The coil spring 5 may be made of metal or synthetic resin.

  In this invention, the container body is formed in a cylindrical shape and has a neck portion (not shown) having an external thread on the outer peripheral surface, and an opening (not shown) provided at the end of the neck portion. A mounting opening (not shown).

  The pump body 2 has an inner peripheral surface having a female screw 2A that is screwed into a male screw provided on the outer peripheral surface of the neck portion, and is a cylinder formed by opening one end and closing the other end with a separation plate 2C. The mounting portion 2B has an insertion opening 2D that opens at the center of the isolation plate 2C and extends in the same direction as the cylindrical portion 2B, and shares the axis of the insertion opening 2D. A suction through hole 2E that extends from the opening edge of the insertion opening 2D into the cylindrical portion 2B, projects from one end opening of the cylindrical portion 2B, and opens to communicate with the container body. A cylindrical body 2G having an annular mounting plate 2F that comes into contact with the isolation plate 2C, and a cylindrical erected side from a peripheral edge of the surface opposite to the cylindrical portion 2B of the isolation plate 2C. And opening the end opposite to the isolation plate 2C. Has an opening tube portion 2I consisting includes a marginal flange portion 2H of the annular comprising protruding radially toward the axis of the insertion opening 2D.

  In this example, synthetic resin is integrally molded so that a cylindrical portion 2B, an isolation plate 2C, and an open cylindrical portion 2I are integrally provided, an attachment body 2F, and a suction through hole 2E. The pump main body 2 assembled with the internal main body portion integrally including the cylindrical body 2G having the cylindrical body 2G is formed.

  In the pump main body 2, a space serving as a pump chamber 8 is formed by a piston 4 and a cylindrical body 2G described later.

  The suction valve 6 is disposed in the cylindrical body 2G. The suction valve 6 includes a hemispherical part 6A having one end formed in a hemispherical shape, a cylindrical part 6B continuous to the hemispherical part 6A, four fins 6C provided on the peripheral side surface of the cylindrical part 6B, An elastic body 6D provided on an end surface of the cylindrical portion 6B opposite to the hemispherical portion 6A and formed in an S shape, and a fixing portion 6E that joins one end of the elastic body 6D and includes a communication hole Have The fixing portion 6E is fitted and fixed in the cylindrical body 2G. The fixing portion 6E determines the bottom dead center of the piston 4 by preventing the piston 4 from further moving in the reciprocating motion of the piston 4. A hemispherical body portion 6A attached in a suspended state via an elastic body 6D to a fixed portion 6E fixedly arranged in the cylindrical body 2G has the suction through-hole 2E constantly opened by the urging force of the elastic body 6D. It is in a closed state.

  The hemispherical part 6A, the cylindrical part 6B, the four fins 6C, the elastic body 6D, and the fixing part 6E can be manufactured by synthetic molding with synthetic resin.

  The piston 4 has a first stem 4A and a second stem 4B.

  The first stem 4A is formed in a substantially cylindrical tubular body, and is provided with a discharge opening 4C that opens at both ends and opens at one end in a circular shape. Further, the first stem 4A protrudes in an annular shape so as to make a round of the peripheral side surface on the peripheral side surface, that is, the outer peripheral surface, at a position away from the end where the discharge opening 4C is formed by a predetermined dimension on the peripheral side surface. A convex portion 4D.

  As shown in FIG. 2, a thin outer diameter portion 4E, a convex portion 4D, a thin outer diameter portion 4F, and a large outer diameter portion 4G are formed in this order from the end surface of the first stem 4A where the discharge opening 4C is present. Thus, the two thin outer diameter portions 4E and 4F have the same radius dimension X, and the outer diameter of the large outer diameter portion 4G and the maximum outer diameter portion 4H of the convex portion 4D have the same radius dimension Y. The convex portion 4D is formed so as to rise gently from the upper thin outer diameter portion 4E in FIG. 2 to reach the maximum outer diameter portion 4H, and gently lower from the maximum outer diameter portion 4H to reach the thin outer diameter portion 4F. In addition, the cross section of the convex portion 4D, that is, the cross section cut along the plane sharing the central axis of the first stem 4A has a mountain shape.

  As shown in FIG. 1, the other end side of the first stem 4A is inserted into an insertion opening 2D provided in the isolation plate 2C.

  As shown in FIG. 1, a part of the second stem 4B is inserted into the other end of the first stem 4A, that is, the other end opposite to the one end provided with the discharge opening 4C. Thus, the second stem 4B is integrally fixed to the first stem 4A.

  The second stem 4B is inserted into the first stem 4A and has an opening having an opening, a hollow tubular central portion extending with the same diameter as the distal end, and the distal end of the central portion. A frustoconical part formed in the shape of a truncated cone on the opposite side, and a disc body 4I formed continuously from the frustoconical part and in liquid-tight contact with the inner peripheral surface of the cylindrical body 2G. An opening that communicates the inside and the outside of the central portion is provided on the peripheral surface of the central portion near the frustoconical portion, an opening is provided on the outer peripheral surface of the frustoconical portion, and one end surface of the disc body 4I Is also provided with a central opening, and the opening in the truncated cone part and the central opening in the disc body 4I communicate with each other inside. As shown in FIG. 1, the second stem 4 </ b> B escapes from the center opening provided at the center of the disc body 4 </ b> I to the outside of the second stem 4 </ b> B and reaches the internal space of the second stem 4 </ b> B again. An internal flow path 4J is provided. A discharge valve 7 is mounted on the peripheral side surface of the central portion, and a disc body 4I is provided at the other end in liquid-tight contact with the inner peripheral surface of the cylindrical body 2G. A pump chamber 8 is formed by a space formed by the disk body 4I and the cylindrical body 2G.

  As shown in FIG. 5, the discharge valve 7 includes an annular base portion 7A having an inner diameter that is larger than the outer diameter of the second stem 4B and an outer diameter that is smaller than the inner diameter of the cylindrical body 2G. An inner annular seal portion 7B which is formed in a cylindrical shape on the inner side in a direction orthogonal to the central axis of the annular base portion 7A, and whose tip is in liquid-tight contact with the outer peripheral surface of the second stem 4B; A first outer annular seal portion that is formed in a cylindrical shape on the outer side in the direction orthogonal to the central axis of the annular base portion 7A, and whose tip is in liquid-tight contact with the inner peripheral surface of the cylindrical body 2G. 7C and the annular base portion 7A are formed in a cylindrical shape so as to extend outward in a direction orthogonal to the central axis and opposite to the outer bubble annular seal portion 7C. Formed with a second outer annular seal portion 7D in liquid-tight contact with the inner peripheral surface of the body 2G It is. In the example shown in FIG. 5, when the tip end portion of the first outer annular seal portion 7C comes into contact with the lower end portion of the mounting cylinder portion 2J, the inner corner portion 7E of the annular base portion 7A comes into close contact with the frustoconical portion. When the internal flow path 4J is closed and the piston 4 descends and the lower end portion of the second stem 4B comes into contact with the tip end portion of the inner annular seal portion 7B, the inner corner portion 7E of the annular base portion 7A is removed from the frustoconical portion. The internal flow path 4J opens and leaves.

  The discharge valve 7 opens and closes the internal flow path 4J, escapes from the center opening provided at the center of the disc body 4I to the outside of the second stem 4B, and reaches the internal space of the second stem 4B again. It has a function of sealing the flow path in a liquid-tight manner.

  The operation button 3 includes a nozzle opening 3A, a flow path 3B, an inner cylindrical portion 3C, a stopper 3D, and an annular flange 3E.

  The operation button 3 includes an outer cylindrical body 3F having a cylindrical shape, and an inner cylinder provided inside the outer cylindrical body 3F so as to be a cylindrical body having the same central axis as the central axis of the outer cylindrical body 3F. And 3C. The inner cylindrical body 3C corresponds to the cylindrical portion in the present invention. A double tube structure is formed by the outer cylindrical body 3F and the inner cylindrical body 3C. An annular space is formed by the inner peripheral surface of the outer cylindrical body 3F and the outer peripheral surface of the inner cylindrical body 3C.

  The outer cylindrical body 3F has a cup shape in which one of the outer cylindrical bodies 3F is open and the other is closed. The end portion on the opening side of the outer cylindrical body 3F has an annular flange 3E formed on an annular flange that slightly protrudes outward and engages with the edge flange 2H.

  As shown in FIG. 1, a part of the coil spring 5 is disposed in the annular space, one end of the coil spring 5 in the space is in contact with the ceiling surface of the outer cylindrical body 3F, and the other end of the coil spring 5 is It is in contact with the surface of the isolation plate 2C. The operation button 3 is urged so as to be separated from the pump body 2 by the urging force of the coil spring 5. Since this operation button 3 is engaged with the edge flange 2H by the annular flange 3E, the operation button 3 does not jump out of the opening cylinder 2I due to the biasing force of the coil spring 5.

  As shown in FIG. 1, the inner cylindrical body 3C has an opening in the outer cylindrical body 3F, that is, an opening that opens toward the isolation plate 2C, and an end opposite to the opening. Is the ceiling surface (assuming the case where the opening is located below as shown in FIG. 1, the end opposite to the opening is located at the top, and the end on the opposite side The portion can be described as a “ceiling surface.”) And is closed, while communicating with the flow path 3B.

  As shown in FIG. 3, the inner cylindrical body 3 </ b> C has a first section in a region where the outer periphery 3 </ b> G having a constant outer diameter along the axial direction and the first stem 4 </ b> A are inserted in a cross section orthogonal to the central axis. The narrow outer diameter portion 4E adjacent to the discharge opening portion 4C of the stem 4A is engaged with the close inner peripheral surface 3H that can be liquid-tightly fitted, and the convex portion 4D provided on the first stem 4A. An engagement portion 3I provided in an annular shape on the inner peripheral surface of the inner cylindrical body 3C so as to protrude radially into the inner cylindrical body 3C, and provided with the engagement portion 3I interposed therebetween. It has two thin parts 3J and 3K.

  The inner cylindrical body 3C is provided with four stoppers 3D. All four stoppers 3D are provided so as to protrude from the ceiling surface and the inner peripheral surface of the inner cylindrical body 3C. In a cross section orthogonal to the central axis of the inner cylindrical body 3C, the four stoppers 3D protrude from the inner peripheral surface of the inner cylindrical body 3C so as to make a right angle with each other, and the two stoppers 3D, 3D facing each other have a predetermined interval. Are arranged. The two stoppers 3D and 3D that face each other have opposing surfaces separated by a predetermined distance. The end surfaces of the four stoppers 3D that are adjacent to the facing surfaces and are on a plane orthogonal to the central axis line are opposed to the end surfaces of the first stem 4A having the ejection opening 4C with a predetermined distance. Placed in. An end surface that is adjacent to the facing surface of the four stoppers 3D and is on a plane orthogonal to the central axis may be referred to as a facing end surface 3L. As shown in FIG. 1, one end of the first stem 4 </ b> A is fitted into the inner cylindrical body 3 </ b> C, and the gap expansion preventing portion 3 </ b> E in the operation button 3 is engaged with the edge flange 2 </ b> H in the pump body 2. Sometimes, the space in the inner cylindrical body 3C formed between the end face of the discharge opening 4C of the first stem 4A and the opposing end face 3L of the stopper 3D may be referred to as a volume increasing / decreasing space Q.

  In FIG. 1, a member denoted by 9 is a packing that enhances liquid tightness by being interposed between the end face of the mounting opening of the container main body and the mounting plate 2F of the pump main body 2.

  The operation of the pump device according to the present invention will be described below.

(Descent of operation button 3)
In the pump device 1 shown in FIG. 1, the state in which the fluid is filled in the pump chamber 8, the piston 4, and the flow path 3 </ b> B is an initial state. When the operation button 3 of the pump device 1 in the initial state and the pump body 2 is positioned above the container body is pressed, the operation button 3 is operated against the urging force of the coil spring 5. 3 goes down. When the operation button 3 is lowered, the opposed end surface 3L of the stopper 3D comes into contact with the end surface of the discharge opening 4C of the first stem 4A. When the operation button 3 is pressed, the first stem 4A is lowered while the opposed end surface 3L of the stopper 3D is in contact with the end surface of the discharge opening 4C of the first stem 4A. When the first stem 4A starts to fall, the fluid starts to come out from the nozzle opening 3A.

  When the operation button 3 is further pressed, both the first stem 4A and the second stem 4B are lowered. The discharge valve 7 does not follow the lowering of the first stem 4A and the second stem 4B at the beginning of the lowering of the first stem 4A and the second stem 4B. As a result, when the first stem 4A is lowered, the lower end portion of the first stem 4A comes into contact with the tip end portion of the inner annular seal portion 7B, and the inner corner portion 7E of the annular base portion 7A is separated from the frustoconical portion, and the internal flow path 4J. Is opened and the discharge valve 7 is opened. The first stem 4A and the second stem 4B are further lowered while the internal flow path 4J is open. At this time, the lower end of the second stem 4B and the tip of the inner annular seal portion 7B are in close contact, and at the same time, the tip of the inner annular seal portion 7B and the outer peripheral surface of the central portion of the second stem 4B are also in close contact. High sealing performance is realized.

  When the first stem 4A and the second stem 4B continue to descend while the discharge valve 7 is open, the fluid continues to come out from the nozzle opening 3A. While the first stem 4A and the second stem 4B continue to descend, the hemispherical portion 6A of the suction valve 6 closes the suction through hole 3E. Therefore, the fluid in the pump chamber 8 does not flow back to the container body through the suction through hole 3E.

  When the operation button 3 is lowered, the disc body 4I finally comes into contact with the fixed portion 6E. Since the fixed portion 6E prevents the piston 4 from being lowered, the operation button 3 cannot be lowered any further. During the period until the operation button 3 is fully lowered, the fluid flows out from the nozzle opening 3A. FIG. 4 shows a state in which the operation button 3 is fully lowered.

(Rise of operation button 3)
Next, after the disk body 4I comes into contact with the fixed portion 6E and the operation button 3 does not fall any further, the pressing force for depressing the operation button 3 is released.

  Then, the inner cylindrical portion 3 </ b> C integrated with the operation button 3 starts to rise due to the urging force of the coil spring 5. When the inner cylindrical portion 3C starts to rise, the first stem 4A does not move. The state where the first stem 4A is stationary without moving continues until the engaging portion 3I in the inner cylindrical portion 3C is engaged with the convex portion 4D of the first stem 4A.

  When the engaging portion 3I is engaged with the convex portion 4D, a gap is generated between the facing end surface 3L of the stopper 3D and the end surface where the discharge opening 4C of the first stem 4A is present, and the inside of the flow path 3B becomes negative pressure. . When the inside of the flow path 3B becomes a negative pressure, the fluid that has come out slightly from the nozzle opening 3A or becomes a liquid ball from the nozzle opening 3A to the outside is discharged from the nozzle opening 3A by the negative pressure. , Is drawn into the nozzle opening 3A. Accordingly, liquid dripping that has conventionally occurred in the nozzle opening 3 </ b> A does not occur in the nozzle device 1.

  When the engaging portion 3I is engaged with the convex portion 4D, the inner cylindrical portion 3C that is going to rise by the biasing force of the coil spring 5 forces the convex portion 4D to the engaging portion 3I to force the first stem 4A. To rise. As the first stem 4A rises, the second stem 4B rises. The discharge valve 7 does not follow the rising operation of the second stem 4B. Therefore, the frustoconical portion of the second stem 4B and the inner corner portion 7E of the annular base portion 7A are in close contact with each other, and the internal flow path 7J is closed by the discharge valve 7. The first stem 4A and the second stem 4B are raised by the urging force of the coil spring 5 while the internal flow path 7J is closed, and the discharge valve 7 is also raised together with the second stem 4B.

  The operation button 3 is lifted by the urging force of the coil spring 5 so that the annular flange 3E is engaged with the edge flange 2H, and the tip of the first outer annular seal portion 7C is placed at the lower end of the mounting cylinder 2J. Continue until the parts abut. When the rising of the first stem 4A starts after the convex portion 4D is engaged with the engaging portion 3I, the frustoconical portion of the second stem 4B and the inner corner portion 7E of the annular base portion 7A are brought into close contact with each other, and the discharge valve 7 When the internal flow path 7J is closed and the second stem 4B is further lifted, the volume in the pump chamber 8 increases, so that the pressure in the pump chamber 8 becomes negative. When the pressure in the pump chamber 8 becomes negative, the hemispherical portion 6A is lifted and the suction through hole 2E is opened. When the first stem 4A further rises, the fluid stored in the pump body flows into the pump chamber 8 through the suction through hole 2E. When the annular flange 3E of the operation button 3 is engaged with the edge flange 2H, the operation button 3 cannot be raised any further. While the operation button 3 continues to rise, the fluid in the pump chamber 8 and the flow path 3B is at a negative pressure, so that no fluid is discharged from the nozzle opening 3A.

(Descent of operation button 3)
When the operation button 3 is fully raised, if the operation button 3 is pressed down and the operation button 3 is pushed down, the operation described in the section (Descent of the operation button 3) starts, and the fluid flows from the nozzle opening 3A. Is discharged.

  In the nozzle device according to the present invention, the engagement portion provided in the cylindrical portion provided in the operation button (referred to as “inner cylindrical portion” in the above example) and the convex portion provided in the piston. By using the combined operation, the pump chamber volume is minimized by the operation button fully lowered, and when the operation button is raised by the urging force of the urging member, only the cylindrical portion is lifted to realize the piston. A space that generates negative pressure in the flow path beyond the tip is realized, and the fluid present in the nozzle opening is drawn into the flow path by this negative pressure to prevent dripping from the nozzle opening. Yes.

DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Pump main body 2A Female screw 2B Cylindrical part 2C Isolation board 2D Insertion opening part 2E Suction through-hole 2F Mounting board 2G Cylindrical body 2H Edge flange part 2I Opening cylinder part 3 Operation button 3A Nozzle opening part 3B Flow path 3C Inside Cylindrical portion 3D Stopper 3E Annular flange 3F Outer cylindrical body 3G Outer surface 3H Close inner surface 3I Engagement portion 3J Thin portion 3K Thin portion 3L Opposing end surface 4 Piston 4A First stem 4B Second stem 4C Discharge opening 4D Convex Shaped portion 4E Thin outer diameter portion 4F Thin outer diameter portion 4G Large outer diameter portion 4H Maximum outer diameter portion 4I Disc body 4J Suction opening 5 Coil spring 6 Suction valve 6A Hemisphere portion 6B Column portion 6C Fin 6D Elastic body 6E Fixed portion 7 Discharge valve 8 Pump chamber 9 Packing

Claims (2)

A pump device including a pump body, a piston, an operation button, an urging member, a suction valve, and a discharge valve;
The pump body is mounted on a mounting opening of a container body that stores fluid, and has a pump chamber that can store the fluid inside and includes a suction through hole communicating with the container body.
The piston has a suction opening that communicates with the pump chamber at one end and a cylindrical body that has a discharge opening that discharges fluid at the other end, and increases the volume of the pump chamber. Or, the piston itself is reciprocally inserted into the pump chamber so as to decrease, and the outer peripheral surface in the vicinity of the discharge opening in the piston has a convex portion protruding from the outer peripheral surface,
The operation button is attached to the pump body, and communicates the nozzle opening for discharging the fluid, the nozzle opening and the piston discharge opening, and the fluid flows from the discharge opening to the nozzle opening. A flow path formed so as to circulate, and a cylindrical portion that accommodates the piston so as to be a double tube having the piston as an inner tube in the vicinity of the end of the piston including the discharge opening, An engagement portion that is provided on an inner peripheral surface of the cylindrical portion near the discharge opening and engages with the convex portion, and when the piston is moved up and down, comes into contact with the end surface of the discharge opening, When not moving up and down, it has a stopper arranged to face the end face of the discharge opening with a predetermined gap,
The urging member is disposed between the pump body and the operation button so as to urge the operation button in a direction in which the operation button rises with respect to the pump body,
The suction valve is disposed in the pump chamber, the discharge valve is disposed in the piston, and when the volume of the pump chamber decreases due to the forward movement of the piston, the suction valve closes the suction through-hole and the discharge valve is connected to the pump chamber and the piston. When the volume of the pump chamber increases due to the backward movement of the piston, the suction valve releases the suction through-hole and the discharge valve closes the communication between the pump chamber and the piston. about,
A pump device characterized by. The piston has a cylindrical first stem in which one end provided with a discharge opening is inserted into the cylindrical part, and the other end is reciprocally attached to an insertion opening provided in the pump body. And a disc body having one end inserted into the other end of the first stem, the other end slidingly fluid-tightly on the inner wall of the pump chamber, and a communication hole communicating the pump chamber with the outside of the pump chamber. A cylindrical second stem having an inner and outer through-hole provided in a peripheral surface between the other end portion and the one end portion and provided in the peripheral surface in the vicinity of the disc body,
The discharge valve is a peripheral side surface of the second stem in the vicinity of the disk body, and is disposed so as to cover the inner and outer through holes. When the piston moves forward, the communication hole moves from the communication hole to the inner and outer through holes. 2. The pump device according to claim 1, wherein the fluid is allowed to flow and the fluid is not allowed to flow from the inner and outer through holes to the communication hole when the piston moves backward. 3.

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