JPS6037072Y2 - Pump structure in air pot - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of the pump structure in an air pot.

Conventionally, as is well known, this type of pump has adopted a bellows-type air pump that uses a soft resin material, and its configuration includes a cylindrical bellows and an intake port that airtightly closes the upper and lower openings of the bellows. It consists of an upper plate with an air outlet and a lower plate with an exhaust port.

However, in manufacturing, in order to airtightly fix the upper and lower plates to the bellows, they are fixed together by pressure welding means such as ultrasonic pressure welding, but in this case, the pressure welding work is troublesome, and there are problems due to poor pressure welding, etc. There was a risk that air would leak from the press-contact portion of the upper and lower circumferential surfaces of the bellows.

In addition, during the expansion and contraction process of the pump, when compressing, the inlet port must be closed to ensure that the air inside the pump flows into the insulated bottle, and conversely, when expanding, the inlet port must be opened to draw in outside air. Therefore, an intake valve that can handle this expansion and contraction operation is required, and the intake valve must be attached to the intake port.
In terms of manufacturing such an air pump, there are problems such as a large number of manufacturing steps and a large number of component parts, making it uneconomical.

Therefore, the object of this invention is to provide a pump structure for an air pot that can be easily manufactured without requiring pressure contact means or an intake valve.

According to this invention, since the entire air pump is integrally formed, there is no need to press the upper and lower plates together as is currently the case.

Therefore, not only can a pressure welding means such as ultrasonic pressure welding be omitted, but also the fear of air leakage can be completely eliminated, and the air pump can be produced only by integral formation, resulting in an extremely simple and economical air pump.

In addition, this air pump is equipped with an intake port that closes when the pressurizing body is pressed down, so when the pressurizing body is pressed down, the air inside the air pump is reliably routed from the exhaust port without air leaking from this intake port. Supplied in an insulated bottle.

Also, when the compressed air pump returns to a vacuum state, the upper part of the stepped spring installed inside it pushes up the pressurizing body and opens the intake port, which draws in outside air and the air pump The return operation is automatic, and the biasing force of the stepped spring portion functions as an intake valve, allowing the air pump to perform smooth expansion and contraction operations suitable for constantly supplying pressurized air.

An embodiment of this invention having such characteristics will be described in detail below based on the drawings.

The drawing shows an air pot equipped with a bellows type air pump. As shown in Figure 1, 1 is the main body, 2 is the lid body,
The main body 1 and the lid 2 are pivotally connected by a pin 3 to form an opening/closing structure.

The above-mentioned main body 1 has a built-in heat retaining layer 4, and the mouth portion 5 of the heat retaining layer 4 has an inner stopper 8 equipped with a spouting pipe 7 for guiding the liquid 6 inside the heat retaining layer 4 to the outside. They fit together, and the spout 9 of the spout tube 7 is made to protrude from the side surface of the main body 1.

A bellows-type air pump 11 is provided at the top of the inner plug 8 to apply air pressure into the heat insulating layer 4 through the ventilation hole 10 of the inner plug 8. A pressurizing body 12 is made to protrude from the upper surface of the main body 1.

A bottom plate 13 is screwed to the lower end of the main body 1, a cylindrical support 14 that supports the lower surface of the heat insulating layer 4 is screwed to the center of the bottom plate 13, and a seat ring 15 is fitted to the lower surface of the bottom plate 13. Main body 1
is configured to be able to rotate on the upper surface of the seat ring body 15.

Furthermore, a safety device 17 is provided on the pouring side of the lid 2, and includes a movable locking piece 16 that connects the main body 1 and the lid 2.
Even if an air pot is accidentally tipped over, a lid body 2 is locked to prevent it from opening from a main body 1, thereby preventing the liquid inside from flowing out.

Furthermore, an air pump 11 is provided inside the lid body 2, and as shown in FIG. An intake port 18 is formed, an exhaust port 19 is formed in the center of the lower surface, a bellows 20 is provided on the circumferential surface to make it expandable and retractable in the axial direction, and a stage for returning the air pump is provided inside. A spring 21 is provided inside.

The above-mentioned intake port 18 is provided vertically through the upper surface protrusion of the air pump 11, and an upper seal ring 23 made of silicone rubber or the like is fitted into the outer circumferential groove 22 of the upper surface protrusion. The intake port 18 is airtightly closed when the pressurizing body 12 is pressed down, thereby preventing outside air from flowing out from the intake port 18.

Additionally, an annular pressure equalizing plate 25 is provided on the entire upper surface of the air pump 11.
is reversed, so that the pressing blade of the pressurizing body 12 is uniformly transmitted to the entire air pump.

The exhaust port 19 is provided vertically through the lower protrusion of the air pump 11, and a lower seal ring 27 such as silicone rubber is fitted into the outer peripheral groove 26 of the lower protrusion, and this is airtightly attached to the upper surface of the inner plug 8. Correspondingly, pressurized air within the air pump 11 is supplied into the heat insulation layer 4 via the inner plug 8.

The entire lower surface of the air pump 11 is supported by an annular receiving plate 28 , and the peripheral edge of the receiving plate 28 is fitted onto the inner circumferential surface of the lid 2 .

The above-mentioned stepped spring 21 is provided in two steps, with the upper part having a small diameter and the lower part having a large diameter. It is provided with a length that protrudes from the upper surface and can push up the pressurizing body 12.

Further, the lower part is provided in a conical shape, and the upper and lower end surfaces of the conical part are disposed inside the air pump 11 so as to be in contact with the upper and lower surfaces inside the air pump 11, and always urge the air pump 11 in the return operation direction.

Reference numeral 29 is a concave portion on the lower surface that fits and supports the conical lower portion of the spring to prevent it from shifting.

When using an air pot equipped with a bellows-type air pump configured in this way, when the pressurizing body 12 is pressed down, its pressing surface 24 presses down the upper part of the stepped spring 21 and the upper seal ring 23, thereby sucking air. The air pump 11 is compressed with the port 18 airtightly closed.

Then, the air inside this pump is discharged through the exhaust port 19 and the inner stopper 8.
Pressurized air is supplied into the heat insulating layer 4 through the vent holes 10, and based on this pressurized air, the liquid 6 in the heat insulating layer 4 is poured out from the spout 9 through the spout pipe 7.

When the air pump 11 returns, the stepped spring 21
The upper part of the pressing surface 24 of the pressurizing body 12 is pushed up and the pressing surface 2
A gap is formed between the stepped spring 21 and the seal ring 23, and outside air is sucked through this gap to allow the outside air to flow into the compressed vacuum air pump 11 to enable return operation. The return force returns the air pump 11 to its original state, and the pressurizing body 12 is also urged outward to return to its original upper limit position again in preparation for the next press.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is a longitudinal sectional view showing an air pot equipped with an integrally formed bellows type air pump. FIG. 2 is an enlarged longitudinal cross-sectional view of the main parts of the air pump. 4... Warm bottle, 1... Air pump, 12... Pressurizing body, 18... Intake port, 19... Exhaust port , 0... Bellows, 21... Stepped spring, 24... Press down surface.

Claims (1)

[Scope of Claim for Utility Model Registration] An air pot equipped with a bellows-type air pump that applies air pressure inside a thermos bottle based on pressing of a pressurizing body, the air pump having a pressurizing body on its upper surface. Equipped with an intake port that airtightly closes when the pressing surface corresponds to the pressing surface, an exhaust port on the bottom surface for supplying pressurized air into the thermos bottle, and a peripheral surface that expands and contracts in the direction in which the pressurizing body is pressed. The entire body is integrally formed with a bellows to allow the pump to move freely, and a stepped spring for returning the pump is installed inside the bellows, and the upper part of the spring is connected to the intake port in order to open the intake port when the pump returns. A pump structure for an air pot characterized by protruding from the upper surface of the mouth.