JPH0744909B2 - Air-pot air pump and method of manufacturing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure of an air pump in an air pot and a manufacturing method thereof. In this specification, the term "air pot" refers to a mode that includes a bellows type air pot and an electric air pot, in which the content liquid is poured out by a bellows type air pump.

FIG. 3 shows an electric air pot as an example of an air pot to which the present invention is applied. In the electric air pot, an inner container 2 is housed in an outer casing 1, and a band heater 3 is wound around the lower outer circumference of the inner container 2. A spouting pipe 4 is attached to the bottom of the inner container 2 and opened, and the spouting pipe 4 is connected to a spout 6 via a pumping pipe 5.

And the lid 7 is fitted on the upper part of the exterior body 1,
An air pump 9 operated by a push button 8 is provided in the lid 7.
Is provided. The air outlet 10 of the air pump 9 penetrates the bottom of the lid 7 and opens at the upper part of the inner container 2. The air pump 9 pressurizes air into the inner container 2, and the air pressure The content liquid in the vessel 2 is pushed up from the pouring pipe 4 through the pumping pipe 5, and is poured out from the pouring port 6.

Thus, the air pump 9 is attached to the end plate 12 at the upper end of the bellows-like bellows 11, and the end plate 12 is attached to the push button 8.
The bellows 11 is operated to move up and down to expand and contract the bellows 11 to send out air. The lower end of the bellows 11 has a reduced diameter, and a packing 13 is fitted to the inner end of the bellows 11, and the packing 13 tightly fits the outer circumference of the air outlet 10.

Conventional Technology Therefore, when manufacturing the air pump 9 in the related art,
As shown in FIG. 2, a flange portion 14 is provided so as to project outward from the upper end portion of the bellows 11, the flange portion 14 is brought into contact with the lower surface of the peripheral edge portion of the end plate 12, and a heater 15 is attached to the tip end of the cylindrical shape. Jig 16
Is fitted to the outer circumference of the bellows 11, and the heater 15 is
The flange portion 14 was heat-welded to the lower surface of the peripheral edge portion of the end plate 12 by press-contacting it.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, according to this method, the flange portion of the bellows 11 with the cylindrical jig 16 fitted to the outside of the bellows 11 is used.
Heater 15 because 14 must be welded to end plate 12.
Is larger than the maximum diameter of the bellows 11. Therefore, the welded portion must be located outside the outermost diameter of the main body portion of the bellows 11, and the diameter of the end plate 12 must be larger than the maximum diameter portion of the main body of the bellows 11.

On the other hand, in general, the air pot preferably has a shape with a thick lower portion and a thin upper portion because of its design, which provides a sense of stability. However, as described above, when the end plate 12 on the upper portion of the air pump 9 has a large diameter, the upper portion of the air pot cannot be made sufficiently small, which is a design restriction.

Further, in the air pump 9 manufactured as described above, when the bellows 11 expands and contracts, the flange portion 14 and the end plate 12 are
There was a case where a force was directly applied to the welded portion with the peripheral edge of the, the flange portion 14 deteriorated due to heat welding was broken, and it could not function as an air pump.

The present invention has been made in view of such circumstances, and it is possible to reduce the diameter of the upper part of the air ponts 9 to form a stable air pot, and to apply a direct force to the welded portion between the bellows 11 and the end plate 12. It is an object of the present invention to provide an air pump 9 and a method for manufacturing the same that can withstand repeated use without such a situation.

Means for Solving the Problems Thus, the air pump of the present invention forms a flange portion extending outward from a position having a diameter equal to or smaller than the diameter of the concave portion in the unevenness of the bellows at the end portion of the bellows,
A folded-back portion extending inward from the outer circumference of the flange portion to a diameter approximately equal to the inner diameter of the flange portion is formed, and the flange portion and the folded-back portion form a bag portion, and the diameter of the bag portion is the bellows. The diameter is equal to or smaller than the diameter of the convex portion of the unevenness, the bag portion is fitted to the outer circumference of the end plate, and the folded portion is welded to the outer peripheral edge portion of the end plate. The invention of the method for manufacturing an air pump is characterized in that a tubular portion having a diameter equal to or smaller than the diameter of the concave portion in the irregularities of the bellows is formed at the end portion of the bellows. Forming a flange portion extending outward at the end of the, and forming a folded portion extending inward from the outer circumference of the flange portion to a diameter approximately equal to the inner diameter of the flange portion,
A bag portion is formed by the flange portion and the folded portion,
The diameter of the bag portion is equal to or smaller than the diameter of the convex portion of the concavo-convex portion of the bellows, the bag portion is fitted to the outer periphery of the end plate, and the outer peripheral portion of the tubular portion, the tubular portion of the tubular portion. A pedestal in which a through hole having a diameter slightly larger than the outer diameter is bored and which is divided in half by the center line of the through hole is laterally fitted, and the end is inserted into the pedestal through the flange portion. It is characterized in that, while supporting the peripheral portion of the plate, the joining means is pressed against the folded portion and the folded portion is welded to the peripheral portion of the end plate.

FIG. 1 shows an air pump 9 of the present invention.
At the upper end of the bellows 11, there is formed a flange portion 18 which extends outward from a position having a diameter substantially equal to or smaller than the diameter of the concave and convex portions of the bellows 11, and from the outer circumference of the flange portion 18. Further, a folded portion 19 extending inward to a diameter substantially equal to the inner diameter of the flange portion is formed, and the flange portion 18 and the folded portion 19 form a bag portion 20. The diameter of the protrusions of the irregularities of the bellows 11 is approximately equal to or smaller than that. And that bag
The peripheral portion of the end plate 12 is fitted in 20 and the folded portion 19
Are welded to the upper surface of the peripheral portion of the end plate 12.

Further, in the method for manufacturing the air pump 9, a cylindrical portion 17 is formed at the upper end of the bellows 11 used in the present invention, and the diameter of the cylindrical portion 17 is equal to the concave and convex concave portions of the bellows 11. The diameter is approximately equal to or smaller than the diameter. A flange portion 18 protruding outward is formed at the upper end of the tubular portion 17, and a folded portion extending inward from the outer circumference of the flange portion 18 to a diameter approximately equal to the inner diameter of the flange portion. 19 is formed, and the flange portion 18 and the folded portion 19 form a bag portion 20. Thus, the diameter of the bag portion 20 is approximately equal to or smaller than the diameter of the convex and concave projections of the bellows 11.

In order to connect the end plate 12 to the bellows 11, first, the peripheral portion of the end plate 12 is fitted into the bag portion 20 of the bellows 11.

Next, a through hole 21 having a diameter slightly larger than the outer diameter of the cylindrical portion 17 of the bellows 11 is bored, and a pedestal 22 divided into two at the center line of the through hole 21 is opened, and the end plate 12 is provided therebetween. The bellows 11 fitted with the above is disposed, the pedestal 22 is closed, and the through hole 21 is formed in the cylindrical portion.
The flange portion 18 is fitted on the outer periphery of the pedestal 17 and is formed on the inner peripheral edge of the pedestal 22.
The peripheral portion of the end plate 12 is placed via the.

In this state, a horn as a joining means is provided on the upper surface of the folded portion 19.
23 is brought into contact, and the folded-back portion 19 is ultrasonically welded while being pressed against the upper surface of the peripheral portion of the end plate 12, and the folded-back portion 19 is welded to the peripheral portion of the end plate 12.

In the present invention, the folded portion 19 and the peripheral portion of the end plate 12 may be heat-welded instead of ultrasonic welding.

EFFECTS OF THE INVENTION According to the present invention, the split pedestal 22 is fitted into the small-diameter cylindrical portion 17, and the end plate 12 is provided on the upper surface of the pedestal 22 via the flange portion 18.
Since the peripheral portion of the bellows 11 is supported, the inner diameter of the through hole 21 of the receiving table 22 can be made sufficiently smaller than the diameter of the convex and concave convex portions of the bellows 11. Since the folded portion 19 is welded on the upper surface of the end plate 12 supported by the pedestal 22, it is not necessary to fit the jig 16 to the outside of the bellows 11, and the diameter is smaller than the diameter of the convex portion of the bellows 11. Even if the folded-back portion 19 and the end plate 12 can be welded at the diameter position, and the diameter of the bag portion 20 is equal to or smaller than the diameter of the convex portion of the bellows 11, the end plate
It is possible to weld 12 and the folded portion 19.

Even if the flange portion 14 is welded to the end plate 12 by ultrasonic welding in the conventional method, ultrasonic welding should be performed unless the diameter of the welded portion is sufficiently larger than the diameter of the convex portion of the bellows 11. However, there is no such limitation in the method of the present invention, and ultrasonic welding can be easily performed as shown in FIG.

Therefore, according to the present invention, the diameter of the air pump 9, particularly the upper portion thereof, can be made small, and at most, the diameter of the convex portion of the bellows 11 or smaller than that. Therefore, the upper portion of the air pot can be made smaller, and the design of the air pot can be made to have a thin and stable shape on the upper portion.

Further, in the air pump 9 of the present invention, the bag portion 20 formed by the flange portion 18 and the folded portion 19 of the bellows 11 is an end plate.
Since it is fitted to the peripheral portion of 12 and the folded portion 19 is welded to the outer peripheral portion of the end plate 12, the force can be transmitted to the folded portion 19 when the bellows 11 expands and contracts. In addition, the welded part is not broken and the function as the air pump is not impaired.

In the above description, as the type of the air pump 9, the lower end of the bellows 11 is directly connected to the outer periphery of the air outlet 10, and the end plate 12 is connected only to the upper end of the bellows 11. However, it is also applicable to a type in which the upper end plate and the lower end plate are connected to the upper and lower ends of the bellows 11, respectively. In this type, one of the both end plates can be joined inside the bellows 11, but at least the other end needs to be welded outside the bellows 11, and the end to be welded outside that is required. It is applied as a method of connecting the plate and the bellows 11.

[Brief description of drawings]

FIG. 1 is a central vertical sectional view showing a state of manufacturing an air pump by the method of the present invention, and FIG. 2 is a central vertical sectional view showing a state of manufacturing an air pump by a conventional method. FIG. 3 is a central longitudinal sectional view of the air pot. 9 ... Air pot, 11 ... Bellows 12 ... End plate, 17 ... Cylindrical part 18 ... Flange part, 19 ... Folding part 20 ... Bag part, 21 ... Through hole 22 ... Cradle, 23 ... Joining means

Claims (2)

[Claims] 1. The bellows (1) at the end of the bellows (11).
A flange portion (18) extending outward from a position having a diameter equal to or smaller than the diameter of the concave portion in the unevenness of 1) is formed, and the outer circumference of the flange portion (18) corresponds to the inner diameter of the flange portion (18). 〞Folded part (19) that extends inward to the same diameter
The flange portion (18) and the folded-back portion (19) form a bag portion (20), and the diameter of the bag portion (20) is set to the diameter of the convex and concave portions of the bellows (11). The diameter is equal to or smaller than that, the bag portion (20) is fitted to the outer periphery of the end plate (12), and the folded portion (19) is connected to the end plate (1).
An air pump for an air pot, characterized by being welded to the outer peripheral edge of 2). 2. The bellows (1) at the end of the bellows (11).
A cylindrical portion (17) having a diameter equal to or smaller than the diameter of the concave portion in the unevenness of 1) is formed, and a flange portion (18) extending outward is formed at the end of the cylindrical portion (17), and the flange is formed. Department (1
A folded portion (19) extending inward from the outer periphery of 8) to a diameter approximately equal to the inner diameter of the flange portion (18) is formed, and the flange portion (18) and the folded portion (19) form a bag portion (20). ) Is formed, and the diameter of the bag portion (20) is equal to or smaller than the diameter of the convex portion of the unevenness of the bellows (11),
The bag portion (20) is fitted on the outer periphery of the end plate (12), and the through hole (21) having a diameter slightly larger than the outer diameter of the tubular portion (17) is provided on the outer periphery of the tubular portion (17). A pedestal (22) which is pierced and divided in half at the center line of the through hole (21) is fitted from the side, and the pedestal (22) is fitted with the flange (18) through the flange portion (18). While supporting the peripheral portion of the end plate (12), the joining means (23) is pressed against the folded portion (19), and the folded portion (19) is welded to the peripheral portion of the end plate (12). Manufacturing method of air pump for air pot, characterized by