JPH0958733A - Structure for suction part of pump unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the structure of a suction part free from defective assemblage for a pump unit. SOLUTION: The upper end of a valve guide 16, provided at a position around a suction port 15 of a cylinder 10, is made to serve as a spring support, and the lower end of a spring energizing a piston 30 upward is butted thereto. The spring support is formed in a triangular section with its apex positioned at the upper side. A suction valve 20 for opening and shutting the suction port 15 is arranged in the cylinder 10. A brake fin 23 is provided at the suction valve 20, and a suspending part provided at the brake fin 23 is made available for suspending the spring 90 from below. The suspending part is formed in a triangular section with its apex positioned at the lower side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal structure near a suction port of a cylinder in a pump device.

[0002]

2. Description of the Related Art Japanese Utility Model Publication No. 7-13816 discloses one of pump devices which is used by being mounted on the mouth cylinder of a container.

The structure of the suction part of this pump device is as follows. Inside the cylinder of the pump device and in the vicinity of the suction port, a suction valve that linearly moves in a direction approaching and separating from the suction port to open and close the suction port is arranged. In addition, a plurality of plate-shaped valve guides for guiding the suction valve are installed in the inner peripheral surface of the cylinder in the vicinity of the suction port so as to be spaced apart from each other in the circumferential direction, and the upper end of the valve guide serves as a spring receiving portion. .

A piston provided reciprocally in the cylinder is urged in a direction away from the suction port by a spring arranged between the piston and the spring receiving portion.

A braking protrusion is provided on the outer peripheral surface of the suction valve. The braking protrusion is inserted between the valve guides, and the braking protrusion abuts against the end of the spring to open the suction valve. It regulates the movement area in the direction.

In this pump device, the inside of the cylinder is pressurized by the forward movement of the piston, the suction valve closes the suction port, and the contents in the cylinder are discharged from the discharge port of the pump device.
Further, the interior of the cylinder is decompressed by the return movement of the piston, the suction valve opens the suction port, and the contents in the container are sucked into the cylinder from the suction port.

FIG. 7 is a sectional view of the suction portion of the conventional pump device. The lower side (side approaching the suction port) of the braking protrusion 101 of the suction valve 100 is formed in a substantially semicircular shape (see FIG. 8), and the spring receiving portion 112 at the upper end of the valve guide 111 of the cylinder 110 is at the upper side. It has a semi-circular cross section that is convex (see FIG. 8).

[0008]

By the way, when assembling the conventional pump device, the cylinder 11 is mounted from above.
0, the suction valve 100 is inserted and the braking protrusion 101 is inserted between the valve guides 111, and then the spring 120 is inserted into the cylinder 110 and the spring 120 is abutted on the spring receiving portion 112. , A spring 120 is attached to the outside of the suction valve 100, and
01, the end of the spring 120 is abutted, and then the suction valve 100 and the spring 120 are put together in the cylinder 110.
Then, the braking protrusion 101 is inserted between the valve guides 111.

However, whichever method is adopted, when the suction valve 100 is inserted into the cylinder 110, the lower edge of the braking protrusion 101 and the tip of the spring receiving portion 112 are unlucky as shown in FIG. If you hit it,
Since the semicircular cross sections abut against each other, the braking protrusion 101 may ride on the spring receiving portion 112 and may not slide down.

If the pump device is assembled without the braking protrusion 101 slipping off from the spring receiving portion 112 in this way, the braking protrusion 101 will be attached to the spring receiving portion 112.
The suction valve 100 cannot be closed by being pinched by the spring 120 and the spring 120, and the suction port 113 cannot be closed.
It becomes impossible to pressurize the inside, so that it cannot function as a pump.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to allow a suction valve to be correctly mounted in a cylinder and to cause malfunctions due to assembly failure. This is to ensure that the pump device can be assembled correctly and securely so that there is no

[0012]

The present invention adopts the following means in order to solve the above problems. (1) According to the present invention, a suction valve that moves linearly in a direction approaching and away from the suction port of the cylinder to open and close the suction port is arranged inside the cylinder of the pump device. Is a plurality of valve guides that guide the suction valve and are spaced apart from each other in the circumferential direction, and a piston that is reciprocally movable in the cylinder is biased by a spring in a direction away from the suction port. Is disposed between a spring receiving portion provided at the upper end of the valve guide and the piston, and a braking protrusion protruding from the outer peripheral surface of the suction valve is inserted between the valve guides, and the braking protrusion is The movement range of the suction valve in the opening direction is regulated by hitting the end of the spring, and the inside of the cylinder is pressurized by the forward movement of the piston, and the suction valve closes the suction port and the contents inside the cylinder. In the structure of the suction part of the pump device, in which the substance is discharged, the pressure in the cylinder is reduced by the return movement of the piston, and the suction valve opens the suction port and sucks the content from the suction port into the cylinder. It is characterized in that the cross-sectional shape of the edge portion of the protrusion is a substantially triangular shape having an apex on the side closer to the suction opening, and the cross-sectional shape of the spring receiving portion is a substantially triangular shape having an apex on the side separated from the suction opening. It is a suction part structure of a pump device (corresponding to claim 1).

In the assembly of the pump device, when the suction valve is inserted into the cylinder, even if the braking projection of the suction valve rides on the valve guide of the cylinder, the vertices of the triangular cross-sections of the two come into contact with each other. Can not stop while riding on the valve guide,
It slips off the valve guide and enters between the valve guides.

(2) The suction valve may be in the form of a rod whose axis coincides with the moving direction of the suction valve (corresponding to claim 2).

(3) The edge portion of the braking protrusion having a substantially triangular cross section may be inclined so as to gradually approach the outer peripheral surface of the suction valve as it approaches the suction port (claim 3).
Corresponding to).

(4) The cross-sectional shape of the sliding contact portion of the valve guide with respect to the suction valve may be a substantially triangular shape having an apex on the side facing the suction valve (corresponding to claim 4).

(5) The cylinder is provided with a spring guide connected to the spring receiving portion on the side farther from the suction port than the spring receiving portion, and the cross-sectional shape of the edge portion of the spring guide is apex toward the inside of the cylinder. It may be a substantially triangular shape having (corresponding to claim 5).

According to the constructions described in (3) to (5), even when the suction valve is inserted into the cylinder, the axial center of the suction valve is eccentric from the axial center of the cylinder. , The braking protrusion can be reliably dropped between the valve guides.

<Raw Material of the Present Invention> Each component of the pump device can be made of plastic.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
From now on, the description will be made with reference to the drawing of FIG.

[First Embodiment] FIG. 1 shows a first embodiment of the present invention.
FIG. 3 is a cross-sectional view of a pump device including the suction part structure of the embodiment. This pump device is used by being attached to the mouth tube portion (not shown) of the container.

The pump device mainly comprises a cylinder 1
0, the suction valve 20, the piston 30, the stem 40,
Cap 70, pump head 80, spring 90
The discharge valve 91, the packing 92, and the suction pipe 93 are provided.

The cylinder 10 is in the shape of a hollow cylinder whose upper and lower sides are open. The upper part is a large-diameter cylinder part 11 and the lower part is a small-diameter cylinder part 12. The upper end of the large-diameter cylinder part 11 is radially outward. A projecting annular flange portion 13 is provided. The inner surface of the boundary between the large-diameter cylindrical portion 11 and the small-diameter cylindrical portion 12 is a valve seat 14, and the inside of the valve seat 14 is a suction port 15.

A plurality of plate-shaped valve guides 16 and spring guides 17 projecting inward and extending in the axial direction are provided on the inner surface of the lower end of the large-diameter cylindrical portion 11 in the circumferential direction. FIG.
3 is an external perspective view of the valve guide 16 and the spring guide 17 as viewed from the inside of the cylinder 10, and the valve guide 16 and the spring guide 17 are formed in a single plate shape and are close to the suction port 15. Valve guide 16 on the side
Is arranged and the spring guide 1 is provided on the side farther from the suction port 15.
7 are arranged.

The upper end of the valve guide 16 is a spring receiving portion 18, and the spring receiving portion 18 is formed in a triangular shape with the center of the upper portion as the apex. The upper end 17a of the spring guide 17 is an inclined surface that rises toward the inner peripheral surface of the cylinder 10.

An annular packing 92 is joined to the lower surface of the flange portion 13, and an upper end portion of a suction pipe 93 is fitted inside the small diameter cylindrical portion 12. The lower end of the suction pipe 93 extends to near the bottom of the container.

A suction valve 20, a piston 30, a stem 40, and a spring 90 are incorporated in the large-diameter cylindrical portion 11 of the cylinder 10. The suction valve 20 has a rod shape,
A valve body 21 that can be seated on and separated from the valve seat 14, a guide rod 22 extending upward from an upper portion of the valve body 21, and a valve body portion 21.
And a plurality of braking fins (braking protrusions) 23 provided at equal intervals in the circumferential direction on the lower outer peripheral surface.

The tip portion of the valve body 21 is slidably inserted inside the guide rib 16 of the cylinder 10. This valve body 2
The outer peripheral portion of the distal end of No. 1 is formed into a convex curved surface, the outer peripheral portion of the distal end is seated on the valve seat 14 to close the suction port 15, and the outer peripheral portion of the tip separates from the valve seat 14 to open the suction port 15.

FIG. 3 is an external perspective view of the braking fin 23. The braking fin 23 is connected to the latch portion 23a inserted between the valve guides 16 of the cylinder 10 and the upper portion of the latch portion 23a. The spring guide portion 23b is provided. The lower edge 23c of the hooking portion 23a located on the side closer to the suction port 15 is inclined downward so as to approach the outer peripheral surface of the valve body 21 as the tip end of the valve body 21 is approached. The cross-sectional shape of 23a is a triangle having the lower edge 23c as an apex.

The radial tip of each hooking portion 23a extends to a position substantially overlapping the spring receiving portion 16a of the cylinder 10, and each hooking portion 23a is inserted between the valve guides 16 of the cylinder 10.

At the upper end of the guide rod 22 of the suction valve 20, a piston stopper 24 is formed whose diameter increases as it goes to the tip. On the outer peripheral surface of the guide rod 22 below the piston stopper 24, a plurality of vertical ribs 25 extending in the axial direction are provided so as to project in the circumferential direction.

The piston 30 has an annular shape and is arranged outside the vertical ribs 25 of the suction valve 20 so that it can move up and down in the cylinder 10 and the guide rod 22 can slide up and down. There is.

The piston 30 is composed of an outer annular portion 31, an inner annular portion 32 and a horizontal annular portion 33 connecting them. The upper and lower outer peripheral surfaces of the outer annular portion 31 are the seal portion 3
4, the inner peripheral surface of the large-diameter cylindrical portion 11 of the cylinder 10 is pressed and slid in a sealed state.

The upper end of the inner annular portion 32 can be hooked on the piston stopper 24 of the suction valve 20. Then, when the inner annular portion 32 separates from the piston stopper 24, the flow passage 26 is formed between the vertical ribs 25 between the inner peripheral surface of the inner annular portion 32 and the outer peripheral surface of the guide rod 22.

The space surrounded by the large-diameter cylinder portion 11 of the cylinder 10, the suction valve 20, and the piston 30 serves as a first pump chamber 19. The piston 30 is urged upward by a spring 90 provided between the horizontal ring portion 33 and the spring receiving portion 18 of the cylinder 10, and therefore, the upper end of the inner ring portion 32 is normally hooked on the piston stopper 24. It is in a stopped state.

The lower end of the spring 90 is inserted between the spring guide 17 of the cylinder 10 and the spring guide portion 23b of the suction valve 20. This spring 90
When the suction valve 20 moves in the opening direction (that is, upward), the lower end of the locks the upper surface of the hooking portion 23a of the braking fin 23 and regulates the upper limit of the suction valve 20.

The stem 40 is attached to the cylinder 10 such that its lower portion is inserted into the large-diameter cylindrical portion 11 of the cylinder 10 so as to be able to move up and down, and the piston 30 is fixed to the lower end of the stem 40.

The stem 40 is in the shape of a hollow cylinder whose top and bottom are open, and the inside is a second pump chamber 41. The inner annular portion 32 of the piston 30 is fitted and fixed in a sealed state inside the lower portion of the stem 40. The piston 30 and stem 4
0 is integrated. When the upper part of the inner annular portion 32 is separated from the piston stopper 24 of the suction valve 20, the second pump chamber 41 passes through the flow passage 26 formed between the suction valve 20 and the piston 30, and the first pump chamber is formed. Connect to 19.

An annular valve seat 43 projecting inward is provided on the upper inner peripheral surface of the stem 40, and a spherical discharge valve 91 is inserted above the valve seat 43, and the discharge valve 91 is a valve seat. Four
3 to close the second pump chamber 41, and the discharge valve 91 separates from the valve seat 43 to open the second pump chamber 41.

The flange portion 13 of the cylinder 10 is attached to the cap 70, and the pump head 80 is fixed to the upper portion of the stem 40, whereby the pump device is unitized.

The cap 70 includes a screw cylinder portion 71 screwed into the mouth cylinder portion of the container, a neck cylinder portion 73 standing upward from a top plate portion 72 of the screw cylinder portion 71, and a large diameter cylinder portion 11 of the cylinder 10. A braking cylinder portion 75 is inserted therein, and an annular hooking protrusion 74 is provided on the upper inner peripheral surface of the screw cylinder portion 71.

The cap 70 connects the stem 40 to the braking cylinder 7
5, while inserting the braking cylinder portion 75 into the cylinder 10, the flange portion 13 of the cylinder 10 is inserted into the screw cylinder portion 71 and abutted against the top plate portion 72, and the outer peripheral edge of the lower end of the flange portion 13 is hooked. It can be mounted on the cylinder 10 by being hooked on the stop projection 74.

At the upper limit position of the stem 40, the tip of the braking cylinder portion 75 abuts against an annular projection 42 provided on the outer peripheral surface of the stem 40, and prevents the stem 40 from jumping out of the cylinder 10. Each member incorporated in the above is prevented from jumping out of the cylinder 10.

The pump head 80 has an inner cylindrical portion 81 into which the upper portion of the stem 40 is fitted, an outer cylindrical portion 82 surrounding the inner cylindrical portion 81, and an outer cylindrical portion 82 connected to the inside of the inner cylindrical portion 81. A pouring nozzle 83 that penetrates and projects outward is provided, and the tip of the pouring nozzle 83 is opened as a pouring outlet 84.

The outer cylinder portion 82 is the neck cylinder portion 7 of the cap 70.
The pump head 80 is arranged so that it can enter inside 3.
Is dimensioned so that the lower end of the outer tubular portion 82 is located slightly below the upper end of the neck tubular portion 73 when is at the upper limit position.

The pump device assembled in this way is
The cylinder 10 is inserted into the container from the mouth tube portion of the container, and the cap 70 is screwed into the mouth tube portion, so that the flange portion 13 and the packing 92 attached to the lower surface thereof are attached to the cap 7.
It is clamped and fixed between the top plate portion 72 of 0 and the upper end of the mouth tube portion and fixed to the container.

FIG. 1 shows a state before the pump head 80 is pushed down, and at this time, the piston 30 and the stem 4 are
0 is located at the upper limit, and the discharge valve 91 is seated on the valve seat 43 to shut off the second pump chamber 41 and the spout 84.

When the piston 30 and the stem 40 are lowered against the elasticity of the spring 90 by pushing down the pump head 80 from this state, the suction valve 20 is also lowered together with the piston 30 in the initial stage of the lowering. Then, when the valve body 21 of the suction valve 20 is seated on the valve seat 14 and closes the suction port 15, only the piston 30 and the stem 40 descend,
The inner annular portion 32 of the piston 30 is separated from the piston stopper 24 of the suction valve 20.

As a result, the first pump chamber 19 and the second pump chamber 41 communicate with each other via the flow path 26, and the pump chambers 19 and 41 are pressurized as the piston 30 descends, and the discharge valve 9
1 separates from the valve seat 43, and the contents of both pump chambers 19 and 41 pass through the spout nozzle 83 of the pump head 80 and are spouted from the spout 84.

While the pump head 80 is being pushed down, the discharge valve 91 continues to separate from the valve seat 43, and the spout 84
The contents are continuously poured from. Then, when the pushing down of the pump head 80 is stopped, the discharge valve 91 moves to the valve seat 43.
Sit down. In FIG. 1, the chain double-dashed line indicates the piston 30 located at the lower limit.

When the hand is released from the pushed down pump head 80, the elasticity of the spring 90 causes the piston 30 and the stem 40 to spring back and be pushed up. At this time, since the discharge valve 91 is seated on the valve seat 43, both pump chambers 19 and 41 are made negative pressure.

The suction valve 20 is pushed up by this negative pressure, the valve body 21 is separated from the valve seat 14, and the suction port 15 is opened. As a result, the contents in the container are
It flows into the pump chamber 19 and further flows into the second pump chamber 41 through the flow path 26. The rise of the suction valve 20 is stopped when the hooking portion 23a of the braking fin 23 hits the lower end of the spring 90.

The first pump chamber 19 and the second pump chamber 41 are communicated with each other by the flow path 26 until the upper end of the inner annular portion 32 of the piston 30 hits the piston stopper 24 of the suction valve 20. The contents are sucked into the chambers 19, 41.

Then, when the inner annular portion 32 of the piston 30 hits the piston stopper 24 of the suction valve 20, the rise of the piston 30 is stopped. At this time, stem 4
The dimensions are set so that a slight gap is formed between the hooking protrusion 42 of 0 and the lower end of the braking cylinder portion 75 of the cap 70.

By the way, when assembling this pump device, the step of inserting the suction valve 20 into the cylinder 10 through the upper opening of the cylinder 10 is indispensable. At this time, the hooking portion 23a in the braking fin 23 of the suction valve 20
The lower edge 23c may ride on the spring receiving portion 18 of the valve guide 16 of the cylinder 10. However, in this pump device, since the lower section of the hooking portion 23a has a triangular shape and the cross section of the spring receiving portion 18 also has a triangular shape, as shown in FIG.
The lower edge 23a of a cannot be stopped while riding on the spring receiving portion 18, and as a result, the hooking portion 23a always falls to either the left or right side of the valve guide 16.

Therefore, the hooking portion 23a of the suction valve 20 can be properly inserted between the valve guides 16 to assemble the pump device, and the pump function is not impaired due to assembly failure.

Further, when the suction valve 20 is inserted into the cylinder 10, it is actually extremely difficult to insert the suction valve 20 so that the axial center of the suction valve 20 and the axial center of the cylinder 10 coincide with each other. It is usually inserted in an eccentric state. In that case, as in this embodiment, the hook portion 2
When the lower edge 23c of 3a is inclined downward, the lower edge 23c
When the ball slides down the spring receiving portion 18, a spherical center function acts to try to align the axial center of the valve body 21 with the axial center of the cylinder 10, and as a result, the valve body 21 is surely inserted into the valve guide 16.

[Second Embodiment] FIG. 5 is a view showing a second embodiment of the present invention, and is a perspective view of a valve guide 16 and a spring guide 17 provided in the cylinder 10.

In this embodiment, not only the spring receiving portion 18 which is the upper end of the valve guide 16, but also the sliding contact portion 16a of the valve guide 16 with respect to the valve body 21, the upper end 17a and the side end 17b of the spring guide 17, Like the spring receiving portion 18, the spring receiving portion 18 has a triangular cross section.

With this arrangement, when the suction valve 20 is assembled in the cylinder 10, even if the hooking portion 23a of the braking fin 23 of the valve body 21 rides on the spring guide 17 of the cylinder 10, the hooking portion 23a is not removed. The valve body 21 can be slid down, and the valve body 21 can be moved to the center of the axis of the cylinder 10.

[Third Embodiment] FIG. 6 is a view showing a third embodiment of the present invention, and is a perspective view of a braking fin 23 provided in the suction valve 20.

This embodiment differs from the braking fin 23 in the first embodiment only in that the lower edge 23c of the hooking portion 23a of the braking fin 23 extends horizontally without inclination. ing. Even when this braking fin 23 is used, when the suction valve 20 is installed in the cylinder 10, the hooking portion 23a can be slid off from the valve guide 16 and correctly inserted between the valve guides 16 to assemble the pump device. it can.

[Combination] Cylinder 10 Valve Guide 1
6 and the spring guide 17, and the braking fin 23 of the suction valve 20 can be appropriately combined with the first to third embodiments.

That is, the valve guide 16 and the spring guide 17 shown in FIG. 2 can be combined with the braking fin 23 shown in FIG. 6, or the valve guide 16 and the spring guide 17 shown in FIG. 5 can be combined with the braking fin 23 shown in FIG. 5, or the valve guide 16 and the spring guide 17 shown in FIG.
And the braking fin 23 shown in FIG. 6 can be combined.

[0065]

As described above, according to the present invention,
The cross-sectional shape of the edge portion of the braking protrusion of the suction valve located on the suction port side is a substantially triangular shape having an apex on the side approaching the suction port, and the cross-sectional shape of the spring receiving portion provided on the cylinder is on the side away from the suction port. When the pump device is assembled, the braking protrusions can be correctly positioned between the valve guides by using the substantially triangular shape having the apex, and the pump device that operates normally can be reliably assembled.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pump device having a suction part structure of the present invention.

FIG. 2 is a perspective view of a valve guide and a spring guide in the first embodiment of the suction portion structure of the present invention.

FIG. 3 is a perspective view of a braking protrusion in the first embodiment of the suction portion structure of the present invention.

FIG. 4 is a view for explaining the action of the first embodiment of the suction part structure of the present invention.

FIG. 5 is a perspective view of a valve guide and a spring guide according to a second embodiment of the suction portion structure of the present invention.

FIG. 6 is a perspective view of a braking protrusion according to a third embodiment of the suction portion structure of the present invention.

FIG. 7 is a sectional view of a suction portion of a conventional pump device.

FIG. 8 is a diagram for explaining a defect of a conventional suction section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cylinder 15 Suction port 16 Valve guide 16a Sliding contact part 17 Spring guide 18 Spring receiving part 19 1st pump chamber 20 Suction valve 21 Valve body 22 Guide rod 23 Braking fin (braking protrusion) 23a Latching part 23c Lower edge 30 Piston 40 Stem 41 Second pump chamber 90 Spring

Claims (5)

[Claims] 1. A suction valve, which linearly moves in a direction approaching and away from a suction port of the cylinder to open and close the suction port, is arranged inside the cylinder of the pump device, and the suction valve is provided near the suction port on the inner peripheral surface of the cylinder. A plurality of valve guides for guiding the valve are installed apart from each other in the circumferential direction, and a piston provided reciprocally in the cylinder is urged by a spring in a direction away from the suction port. A braking protrusion provided on the upper end of the valve guide and the piston is provided between the spring receiving portion and the piston. The braking protrusion protruding from the outer peripheral surface of the suction valve is inserted between the valve guides. The movement of the suction valve in the opening direction is restricted by hitting the end, and the inside of the cylinder is pressurized by the forward movement of the piston, the suction valve blocks the suction port, and the contents in the cylinder are In the suction part structure of the pump device that is discharged, the inside of the cylinder is decompressed by the return movement of the piston, the suction valve opens the suction port, and sucks the contents from the suction port into the cylinder. The cross-sectional shape of the edge part is a substantially triangular shape having an apex on the side approaching the suction port,
A suction part structure of a pump device, wherein a cross-sectional shape of the spring receiving part is a substantially triangular shape having an apex on a side separated from a suction port. 2. The suction part structure of a pump device according to claim 1, wherein the suction valve has a rod shape whose axis is aligned with a moving direction of the suction valve. 3. The edge portion of the braking protrusion having a substantially triangular cross section is inclined so as to gradually approach the outer peripheral surface of the suction valve as it approaches the suction port. The structure of the suction part of the pump device described in 1. 4. The cross-sectional shape of the sliding contact portion of the valve guide with respect to the suction valve is a substantially triangular shape having an apex on the side facing the suction valve. Structure of suction part of pump device. 5. The cylinder is provided with a spring guide connected to the spring receiving portion on a side farther from the suction port than the spring receiving portion, and a cross-sectional shape of an edge portion of the spring guide has an apex inward of the cylinder. The suction part structure of the pump device according to any one of claims 1 to 4, wherein the suction part structure has a substantially triangular shape.