JP2004160416A - Fluid-spouting pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid-spouting pump wherein fluid-suction efficiency and the volume of spouting can be held constant by stabilizing the function of opening and closing a valve element without necessitating high dimensional accuracy. <P>SOLUTION: The fluid-spouting pump A comprises a cylinder 2, a piston part P, a spout hole 10a, a flow path 40, the valve element 4, and an urging means 6, and valve-element releasers 4b, 2p. The piston part P is inserted so as to freely retractably in the cylinder 2. Fluid sucked in the cylinder 2 is spouted from the flow hole 10a. The flow path 40 connects the inside of the cylinder 2 to the hole 10a. The valve element 4 is placed slidably between the cylinder 2 and the piston part P to control the condition of communication between the inside of the cylinder 2 and the flow path 40. The urging means 6 urges the valve element 4 in the direction to shut off the communication between the inside of the cylinder 2 and the flow path 40. With the pushing operation of the piston part P into the cylinder 2, the valve-element releasers 4b, 2p move relatively the valve element 4 and the piston part P against the urging means 6 to allow the inside of the cylinder 2 to communicate with the flow path 40. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fluid ejection pump for ejecting a fluid contained in a container.
[0002]
[Prior art]
2. Description of the Related Art Various types of fluid ejection pumps mounted on a container containing a fluid such as a cosmetic liquid and for sucking and discharging the fluid from the container are known (for example, Patent Document 1). reference).
[0003]
Such a fluid ejection pump is, for example, a cylinder having a cap detachably connected to a container containing a fluid, a piston portion inserted and retracted into and out of the cylinder, and sucked into the cylinder. A discharge hole for discharging the fluid in the container and a flow passage for connecting the inside of the cylinder to the discharge hole are provided. In addition, a valve body that controls a communication state between the inside of the cylinder and the flow passage is slidably disposed between the cylinder and the piston portion.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 9-501352
[Problems to be solved by the invention]
By the way, in the fluid ejection pump having the above-mentioned configuration, the lower inner surface of the valve body comes into contact with, for example, a tapered portion of the piston portion, so that the close contact between the valve body and the piston portion is maintained. This adhesion is stabilized by the sliding resistance between the inner peripheral surface of the cylinder and the valve body. In this case, since the sliding resistance between the inner peripheral surface of the cylinder and the valve body must be greater than the sliding resistance between the piston portion and the valve body, high dimensional accuracy is required for these members. Is done.
[0006]
However, if the dimensional accuracy of the members cannot be kept high, the opening / closing operation of the valve body becomes unstable, and the fluid suction efficiency and discharge amount become unstable (fluctuations in the number of times of fluid suction and discharge amount increase. ) There is a fear.
[0007]
The present invention has been made in view of the above circumstances, and aims to stabilize the opening / closing operation of the valve element without requiring high dimensional accuracy, to keep the fluid suction efficiency and the discharge amount constant. It is to provide a fluid ejection pump that can be maintained.
[0008]
[Means for Solving the Problems]
In order to solve the above problem, a fluid ejection pump according to claim 1 includes a cylinder having a cap detachably connected to a container containing a fluid, and a cylinder connected to the cylinder and contained in the container. A tube inserted into the fluid, a suction valve disposed in the cylinder, and controlling a communication state between the cylinder and the tube, a piston portion movably inserted into the cylinder, and the piston. A spring interposed between the portion and the suction valve, and a discharge hole for discharging the fluid in the container sucked into the cylinder via the suction valve, and has a biasing force of the spring. A pressing body for pushing the piston portion into the cylinder in opposition, and a pressing member formed inside the piston portion for connecting the inside of the cylinder to the discharge hole. A flow passage, a valve body slidably disposed between the cylinder and the piston portion, and a valve body that controls a communication state between the inside of the cylinder and the flow passage; and an inside of the cylinder and the flow passage. Urging means for urging the valve body in a direction in which communication of the valve body is interrupted, and the valve body opposing the urging means with a pushing operation of the piston portion into the cylinder by the pressing body. A valve body opening means for communicating the inside of the cylinder with the flow passage by relatively moving the piston and the piston portion.
[0009]
According to the fluid ejection pump according to the first aspect, the opening and closing of the valve element is reliably (automatically and forcibly) performed by the urging means and the valve opening means without depending on the sliding resistance. Therefore, the opening / closing operation of the valve body can be stabilized without requiring high dimensional accuracy, and the fluid suction efficiency and the discharge amount can be kept constant.
[0010]
Further, in the fluid ejection pump according to the second aspect, in the fluid ejection pump according to the first aspect, the piston portion may be engaged with a tubular stem and engaged with the stem to slide the valve body. A guide portion for guiding, the guide portion has a plurality of ribs inserted into the stem, the rib is separated from the inner peripheral surface of the stem, the inner peripheral surface of the stem and The flow path is formed between the two.
[0011]
According to the fluid ejection pump according to the second aspect, the same operation and effect as those of the fluid ejection pump according to the first aspect are obtained, and the rib is separated from the inner peripheral surface of the stem. Since a large flow passage can be ensured, the pump efficiency can be dramatically increased.
[0012]
Further, a fluid ejection pump according to a third aspect of the present invention is the fluid ejection pump according to the first or second aspect, further comprising a regulating unit that regulates a pushing amount of the piston portion into the cylinder. It is characterized by the following.
[0013]
According to the fluid ejection pump according to the third aspect, the same operation and effect as those of the fluid ejection pump according to the first or second aspect can be obtained. Since the pushing amount of the piston portion can be reliably defined, it is possible to prevent the valve body and the like from collapsing (breaking) due to the pushing operation of the piston portion.
[0014]
According to a fourth aspect of the present invention, there is provided the fluid jet pump according to the third aspect, wherein the restricting means is formed on a flange formed on the piston and on an inner peripheral surface of the cylinder. And the flange portion comprises an abuttable contact surface.
[0015]
According to the fluid ejection pump according to the fourth aspect, the same operation and effect as those of the fluid ejection pump according to the third aspect are obtained, and the contact between the flange portion and the front contact surface allows the fluid ejection pump to perform the operation. The pushing amount of the piston portion can be mechanically reliably defined.
[0016]
According to a fifth aspect of the present invention, there is provided the fluid ejection pump according to the fourth aspect, wherein the flange portion has a cutout through which fluid in the cylinder can flow. And
[0017]
According to the fluid ejection pump according to the fifth aspect, the same operation and effect as those of the fluid ejection pump according to the fourth aspect can be obtained, and the amount of pushing of the piston portion is defined, so that the amount of the piston portion is reduced. The flow of the fluid toward the flow passage can be ensured while preventing collapse (breakage) of the valve body and the like due to the pushing operation.
[0018]
According to a sixth aspect of the present invention, there is provided the fluid ejection pump according to any one of the first to fifth aspects, wherein air discharged from inside the cylinder is provided on a side surface of the cylinder. An air compensating hole for compensating the pressure is formed, and the valve body has a seal portion for preventing leakage of fluid through the air compensating hole.
[0019]
According to the fluid ejection pump according to the sixth aspect, the same function and effect as those of the fluid ejection pump according to any one of the first to fifth aspects can be obtained, and the fluid ejection pump through the air compensation hole can be obtained. It is not necessary to provide a new sealing member for preventing leakage of the fluid, and the number of parts can be reduced.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
As shown in FIG. 1, a fluid ejection pump A according to the present embodiment includes a screw cap 1 screwed into an opening of a container (not shown) containing a liquid (cosmetic liquid or the like), and a screw cap 1 attached to the screw cap 1. Connected to the lower end of the cylinder 2, a piston portion P which is inserted into the cylinder 2 so as to be able to advance and retreat, an actuator 10 which is attached to the head of the piston portion P and has a discharge hole 10 a as a pressing body. And a dip tube 11 inserted into the container (immersed in the liquid in the container). The piston portion P includes a stem 3 connected to the actuator 10 such that the inner hole 3f communicates with the discharge hole 10a, a piston (valve element) 4 and a piston guide 5 mounted on the lower end of the stem 3. And is slidably held in the upper inner hole 2a of the cylinder 2 in an airtight manner.
[0022]
The upper part of the screw cap 1 is composed of a bottomed cylindrical outer cylinder 1p forming an inner hole 1a, and an inner cylinder 1c formed substantially concentrically inside the outer cylinder 1p. The inner cylinder 1c extends downward from the inner surface of the upper end of the screw cap 1 by a predetermined length, and forms an annular space with the outer cylinder 1p. The upper end mounting portion 2c of the cylinder 2 is fitted and fixed in the annular space. Reference numeral 9 in the drawing denotes a packing for maintaining the annular space in a liquid-tight manner. Further, by changing the fitting length between the annular space and the upper end mounting portion 2c of the cylinder 2, the stroke of the piston P can be changed to change the discharge amount.
[0023]
A flange 3b is protruded from an outer peripheral surface of the stem 3 inserted into the inner cylindrical body 1c of the screw cap 1. Further, a piston sliding portion 3c is suspended from the lower end of the flange portion 3b, and an upper stem sliding portion 4c of the piston 4 is mounted on the outer periphery of the piston sliding portion 3c so as to be able to slide in an airtight manner. ing. In addition, a first spring 6 is held between the upper stem sliding portion 4c and the flange 3b of the stem 3 in an interposed state.
[0024]
On the upper part of the piston guide 5, three long ribs 5a are extended. The distal end of each of the ribs 5a is engaged with an annular protrusion 3d formed on the inner peripheral surface of the stem 3, whereby the piston guide 5 is held by the stem 3. . Each rib 5a forms a flow passage 40 between itself and the inner surface 3e of the piston sliding portion 3c of the stem 3. Further, the piston guide 5 is formed with a concave groove 5c for connecting the internal space of the cylinder 2 to the flow passage 40.
[0025]
The piston guide 5 has a first step 51 connected to the piston slide 3c. The first step 51 has a lower end of the piston slide 3c of the stem 3b. 3f is in contact. On the side surface of the second step portion 5d of the piston guide 5 formed below the first step portion 51, a lower inside diameter portion 4d of the lower part of the piston 4 is slidably held in an airtight manner. ing. In this case, the piston 4 is pressed by the pressing force of the first spring 6 against the third step 5e of the piston guide formed below the second step 5d. The inner diameter portion 4d of the middle foot 4 is tightly fixed to the third step portion 5e of the piston guide 5. The lower middle foot inner diameter portion 4d of the piston 4 is tightly adhered in this manner to close the concave groove 5c, thereby preventing leakage from the dip tube 11 side in the stationary state of the fluid ejection pump A.
[0026]
A notch 5g is formed in the flange 5f of the piston guide 5 connected to the third step 5e. Further, a lower portion of the flange portion 5f of the piston guide 5 has an outer diameter that can be inserted into the lower inner hole 2k of the cylinder 2 (the inner diameter of the lower inner hole 2k is smaller than that of the upper inner hole 2a). A narrow shaft portion 5i is vertically provided. Further, a holding portion 5k for holding the second spring 7 is provided above the narrow shaft portion 5i.
[0027]
Above the inner hole 2a of the cylinder 2, an air compensating hole 2b for compensating the air discharged from the inside of the cylinder 2 is provided. When the fluid ejection pump A is in a stationary state, the air compensating hole 2b is held in a non-conductive state by the upper slide portion 4a of the piston 4. That is, the piston upper slider portion 4a prevents leakage through the air compensating hole 2b when the fluid ejection pump A is stationary.
[0028]
A lower tapered portion 2e that forms a valve seat is formed in the lower tapered portion 2e of the cylinder 2. A rib 2f is provided on a side surface of the lower tapered portion 2e, and a second spring 7 is interposed between a step 2i of the rib 2f and a flange 5f of the piston guide 5.
[0029]
The lower tapered portion 2e of the cylinder 2 holds a ball 8 constituting a suction valve together with the lower tapered portion 2e. The movement of the ball 8 is restricted by the lower end of the second spring 7 held by the step 2i of the rib 2f. A dip tube 11 is fitted and fixed to a fitting portion 2h formed at a lower portion of the cylinder 2. In addition, an intermediate step portion 2i with which the lower slide portion 4b of the piston 4 contacts is formed on the lower inner surface of the upper inner hole 2a of the cylinder 2, and is formed at a boundary between the upper inner hole 2a and the lower inner hole 2k. Has a lower end tapered portion 2g.
[0030]
Next, the operation of the fluid ejection pump A having the above configuration will be described.
[0031]
First, when the actuator 10 is pushed down, the piston portion P is pushed down as shown in FIG. 2, and the lower slide portion 4b of the piston 4 comes into contact with the intermediate step portion 2p of the cylinder 2. This prevents further downward movement of the piston 4. When the actuator 10 is further depressed from this state, the first spring 6 is compressed, and the inner diameter portion 4d of the middle foot of the piston 4 whose movement has been restricted moves from the side surface of the second step portion 5d of the piston guide 5. break away. Thereby, the inside of the cylinder 2 and the flow passage 40 communicate with each other through the concave groove 5c (the valve formed by the piston 4 is opened). Therefore, the compressed air inside the cylinder 2 is discharged from the recessed groove 5 c of the piston guide 5 through the flow passage 40 to the outside through the discharge hole 10 a of the actuator 10 through the inner hole 3 f of the stem 3. When the flange 5f of the piston guide 5 integrated with the stem 3 comes into contact with the lower end tapered portion 2g of the cylinder 2, further movement of the piston P downward is prevented. Even if the flange 5f of the piston guide 5 contacts the lower end tapered portion 2g of the cylinder 2, the air is smoothly discharged because the flange 5f of the piston guide 5 is provided with the vertical groove 5g. .
[0032]
At this time, since the narrow shaft portion 5i of the piston guide 5 enters the lower inner hole 2k, the inside of the lower inner hole 2k is narrowed, so that the air remaining in the lower inner hole 2k is reduced. Is extremely reduced, so that the siphoning efficiency in the next step can be increased.
[0033]
Next, when the pressing force on the actuator 10 is released from this state, the piston portion P is moved upward by the spring force of the second spring 7. When the third step 5e of the piston guide comes into contact with the piston 4, the piston 4 moves upward together with the piston P, and the communication between the inside of the cylinder 2 and the flow passage 40 via the concave groove 5c. Is shut off (the valve formed by the piston 4 is closed), and the inside of the cylinder 2 is kept airtight. Accordingly, as the piston 4 and the piston portion P move upward, the pressure inside the cylinder 2 is reduced, and the fluid in the container is sucked into the cylinder 2 via the dip tube 11. Thereafter, by repeating these operations, the fluid can be discharged from the discharge holes 10a.
[0034]
As described above, the fluid injection pump A according to the present embodiment includes the cylinder 2 having the cap 1 detachably connected to the container storing the fluid, and the fluid 2 connected to the cylinder 2 and stored in the container. A tube 11 inserted therein, a suction valve 8 disposed in the cylinder 2 and controlling a communication state between the cylinder 2 and the tube 11, a piston portion P inserted into the cylinder 2 so as to be able to advance and retreat, and a piston A spring 7 inserted between the portion P and the suction valve 8, and a discharge hole 10a for discharging the fluid in the container sucked into the cylinder 2 via the suction valve 8; A pressing body 10 for pushing the piston portion P into the cylinder 2 against the urging force, and a flow member formed inside the piston portion P and connecting the inside of the cylinder 2 to the discharge hole 10a. A valve body 4 slidably disposed between the cylinder 2 and the piston portion P for controlling the communication between the inside of the cylinder 2 and the flow passage 40; Urging means 6 for urging the valve body 4 in a direction in which communication with the valve body 4 is interrupted, and a valve against the urging means 6 in response to the pushing operation of the piston P by the pressing body 10 into the cylinder 2. Valve body opening means 2p and 4b are provided for communicating the inside of the cylinder 2 with the flow passage 40 by relatively moving the body 4 and the piston portion P.
[0035]
Therefore, the opening and closing of the valve body (piston) 4 is reliably (automatically) performed by the urging means 6 and the valve opening means 2p and 4b regardless of the sliding resistance, so that high dimensional accuracy is achieved. , The opening and closing operation of the valve element 4 can be stabilized, and the fluid suction efficiency and the discharge amount can be kept constant. In particular, in the present embodiment, the suction efficiency is improved due to the forcible opening and closing of the valve element 4 by the urging means 6, and the narrowing of the lower inner hole 2k by the narrow shaft portion 5i of the piston guide 5 is caused. By discharging the compressed air, the initial suction efficiency is stabilized, and the discharge amount is also stabilized accordingly.
[0036]
Further, in the fluid injection pump A of the present embodiment, the piston portion P includes the tubular stem 3 and the guide portion 5 locked to the stem 3 and guiding the sliding of the valve element 4. Has a plurality of ribs 5a inserted into the stem 3, and the ribs 5a are separated from the inner peripheral surface of the stem 3 to form the flow passage 40 with the inner peripheral surface of the stem 3. I have. Therefore, since the ribs 5a are separated from the inner peripheral surface of the stem 3, a large flow passage 40 can be secured, and the pump efficiency can be dramatically increased.
[0037]
Further, in the present embodiment, a regulating means for regulating the amount of pushing of the piston portion P into the cylinder 2 is provided. Therefore, the pushing amount of the piston portion P can be reliably defined by the restricting means irrespective of the spring 7, so that the valve body 4 or the like caused by the pushing operation of the piston portion P is prevented from being crushed (damaged). Can be. In particular, in the fluid injection pump A according to the present embodiment, the restricting means includes a flange portion 5f formed on the piston portion P and a contact surface formed on the inner peripheral surface of the cylinder 2 and capable of contacting the flange portion 5f. 2g. Therefore, by the contact between the flange portion 5f and the contact surface 2g, the pushing amount of the piston portion P can be mechanically reliably defined.
[0038]
Further, in the fluid ejection pump A of the present embodiment, a notch 5g through which the fluid in the cylinder 2 can flow is formed in the flange portion 5f. Therefore, it is possible to secure the flow of the fluid toward the flow passage 40 while preventing the collapse (breakage) of the valve body 4 and the like due to the pushing operation of the piston portion P by defining the pushing amount of the piston portion P.
[0039]
Further, in the fluid ejection pump A of the present embodiment, an air compensating hole 2b for compensating air discharged from the cylinder 2 is formed on a side surface of the cylinder 2, and the valve body 4 is connected to the air compensating hole 2b through the air compensating hole 2b. And a seal portion 4a for preventing leakage of the fluid. Therefore, it is not necessary to provide a new sealing member for preventing leakage of the fluid through the air compensating hole 2b, and the number of parts can be reduced.
[0040]
【The invention's effect】
According to the fluid ejection pump according to the first aspect, the opening and closing of the valve element is reliably (automatically (forced)) performed by the urging means and the valve opening means without depending on the sliding resistance. Therefore, the opening / closing operation of the valve body can be stabilized without requiring high dimensional accuracy, and the fluid suction efficiency and the discharge amount can be kept constant.
[0041]
According to the fluid ejection pump described in claim 2, the same operation and effect as those of the fluid ejection pump described in claim 1 can be obtained, and the rib is separated from the inner peripheral surface of the stem, whereby Since a large flow passage can be secured, the pump efficiency can be dramatically increased.
[0042]
According to the fluid ejection pump according to the third aspect, the same operation and effect as those of the fluid ejection pump according to the first or second aspect can be obtained, and the regulating means is provided by the regulating means without using the spring. Since the pushing amount of the piston portion can be reliably defined, it is possible to prevent the valve body and the like from being crushed (broken) due to the pushing operation of the piston portion.
[0043]
According to the fluid ejection pump according to the fourth aspect, the same operation and effect as those of the fluid ejection pump according to the third aspect are obtained, and the contact between the flange portion and the front contact surface allows the piston to be moved. The pushed-in amount of the part can be reliably defined mechanically.
[0044]
According to the fluid ejection pump according to the fifth aspect, the same operation and effect as those of the fluid ejection pump according to the fourth aspect are obtained, and the pushing amount of the piston is defined by defining the pushing amount of the piston. The flow of the fluid toward the flow passage can be ensured while preventing collapse (breakage) of the valve body and the like due to operation.
[0045]
According to the fluid ejection pump according to the sixth aspect, the same operation and effect as those of the fluid ejection pump according to any one of the first to fifth aspects are obtained, and the fluid through the air compensating hole is obtained. It is not necessary to provide a new sealing member for preventing the leakage of the components, and the number of parts can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a fluid ejection pump according to an embodiment of the present invention in a stationary state.
2A is a plan view of a piston guide included in the fluid ejection pump of FIG. 1, and FIG. 2B is a perspective view of the piston guide of FIG.
FIG. 3 is a sectional view of the fluid ejection pump of FIG. 1 in an operating state.
[Explanation of symbols]
A Fluid ejection pump P Piston part 1 Screw cap 2 Cylinder 2b Air compensation hole 2g Lower end taper part (regulation means; contact surface)
2p Intermediate step (valve opening means)
3 stem 4 piston (valve element)
4a Upper slide part (seal part)
4b Lower slide part (valve element opening means)
5 Piston guide (guide part)
5a rib 5f flange (restriction means; flange)
5g Notch 6 First spring (biasing means)
7 Second spring (spring)
8 ball (suction valve)
10 Actuator (pressing body)
10a Discharge hole 11 Dip tube (tube)
40 Flow passage

Claims (6)

A cylinder having a cap detachably connected to a container containing the fluid,
A tube connected to the cylinder and inserted into a fluid contained in the container;
A suction valve disposed in the cylinder to control a communication state between the cylinder and the tube;
A piston portion inserted into the cylinder so as to be able to advance and retreat,
A spring inserted between the piston portion and the suction valve,
A pressing body for having a discharge hole for discharging the fluid in the container sucked into the cylinder via the suction valve, and for pushing the piston portion into the cylinder against the urging force of the spring; When,
A flow passage formed inside the piston portion, for connecting the inside of the cylinder to the discharge hole,
A valve body slidably disposed between the cylinder and the piston portion, for controlling a communication state between the inside of the cylinder and the flow passage;
Biasing means for biasing the valve body in a direction in which communication between the inside of the cylinder and the flow passage is interrupted;
With the operation of pushing the piston portion into the cylinder by the pressing body, the valve body and the piston portion are relatively moved against the urging means, so that the inside of the cylinder and the Valve body opening means for communicating with the flow passage;
A fluid ejection pump comprising: The piston unit includes a tubular stem, and a guide unit that is locked to the stem and guides sliding of the valve body.
The guide has a plurality of ribs inserted into the stem,
2. The fluid ejection pump according to claim 1, wherein the rib is separated from an inner peripheral surface of the stem to form the flow passage with the inner peripheral surface of the stem. 3. 3. The fluid ejection pump according to claim 1, further comprising a regulation unit that regulates a pushing amount of the piston unit into the cylinder. 4. The said restriction | limiting means consists of the flange part formed in the said piston part, and the contact surface formed in the inner peripheral surface of the said cylinder, and the said flange part can contact, The Claims characterized by the above-mentioned. Fluid ejection pump. The fluid ejection pump according to claim 4, wherein a cutout through which fluid in the cylinder can flow is formed in the flange portion. On the side surface of the cylinder, an air compensating hole for compensating the air discharged from inside the cylinder is formed,
The fluid ejection pump according to any one of claims 1 to 5, wherein the valve body has a seal portion for preventing leakage of fluid through the air compensating hole.

Images