JPH0221596Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a fluid pressure feeding device that is incorporated into an air pot or the like.

[Technical background of the invention and its problems]

FIG. 1 shows a conventional fluid pumping device. In the figure, a indicates a bellows. An opening b is formed in the center of the upper end surface of the bellows a, and a bellows valve c is attached to the opening b. The bellows valve c is elastically biased upward by a spring d and has a packing e, and normally the inside of the bellows a communicates with the atmosphere through an opening b. From this state, the bellows valve c is pressed by the pressing body f, and the pressing force causes it to descend against the spring d.As the bellows valve c descends, the packing e collides with the seat g on the periphery of the opening b, and the opening b opens. sealed. The bellows valve c further descends, and as it descends, the center of the upper surface of the bellows a is pressed, the air within the bellows a is compressed, and this compressed air flows out from the outlet h. After this, the pressing force on the bellows valve c is released, and due to this release, the bellows valve c rises and the packing e is moved to the catch seat g.
The opening b is opened, air flows into the bellows a through the opening b, and the bellows a returns to its original expanded state. By repeating this process, air is sequentially pumped.

However, since the center part of the upper end face of bellows A is locally pressed, the center part of the end face first descends at the beginning of compression, and the thin wall part A at its periphery bends greatly, as shown by the chain line in the figure, and then the whole part collapses. compresses. As a result of repeating such operations, fatigue called so-called fatigue occurs in the thin wall portion A, and the multiple force of the bellows A decreases and deforms into an irregular shape, making it difficult to pump a predetermined amount of air. I often get used to it. Furthermore, when compressing bellows a, it is important to accurately press its upper surface in the axial direction of bellows a, but the posture of bellows valve c often collapses and the force applied to bellows a is reduced. The direction is biased, and this bias in force causes the bellows a to compress into an irregular shape, making it difficult to pump a predetermined amount of air.

[Purpose of invention]

The present invention was developed with attention to the points mentioned above, and its purpose is to prevent the bellows from becoming sagging, and to adjust the posture of the bellows valve so that the bellows are always compressed in an appropriate shape. An object of the present invention is to provide a fluid pumping device that can perform

[Structure of the idea]

In order to achieve such an object, the present invention has a bellows having an opening at the end surface and the outer periphery of the opening being open to the atmosphere at all times, and a bellows attached to the opening of the bellows and extending along the axial direction of the bellows. a bellows valve that opens and closes its opening by moving along the bellows valve;
A spring that elastically biases the bellows valve in the opening direction and holds the bellows in an expanded state with its biasing force; A reinforcing plate is provided in a recess so as to be slidable up and down, and its downward movement presses the bellows valve in the closing direction, transmitting the force from the bellows valve to the end face of the bellows via the reinforcing plate, thereby closing the bellows. The pushing body is provided with a pressing cylinder having a flange at one end, the bellows valve is integrally provided with a fitting protrusion, and the fitting protrusion is provided inside the pressing cylinder. When fitted, the flange of the pressing cylinder contacts the bellows valve in this fitted state, and this contact causes the bellows valve to move in the closing direction in response to the downward movement of the pressing body. .

[Effect of invention]

In such a configuration, when the pushing body is pushed downward, the bellows valve is pressed against the spring and moves downward via the flange of the pushing cylinder that is integrally provided with the pushing body. On this occasion,
Since the fitting protrusion protruding from the bellows valve fits into the press cylinder, the bellows valve moves downward while maintaining its proper posture. As the bellows valve descends, the opening of the bellows is sealed, and the downward force of the bellows valve is transmitted to the entire end face of the bellows via the reinforcing plate, thereby compressing the bellows and expelling the air inside it. .

When you release the pushing operation on the pushing body,
As the bellows expands due to the biasing force of the spring, the bellows valve moves upward and separates from the opening of the bellows, causing air to flow into the bellows, and the pushing body rises together with the bellows valve, causing the initial Return to position.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described with reference to FIG. The figure shows a pneumatic pot, and reference numeral 1 denotes a cylindrical exterior case, in which a leg ring 2 is attached to the lower end opening of the case 1, and a support ring 3 is attached to the upper end opening. A cylindrical tank 4 with a bottom is housed inside the exterior case 1, and this tank 4 has a flange 5 at the upper opening edge, and this flange 5 connects to a support step 6 formed on the inner peripheral edge of the support ring 3. Collision occurs via packing 7. A mounting piece 8 is fixed to the outer bottom surface of the tank 4 by welding or the like, and a bottom cover 9 is provided at the inner peripheral opening of the leg ring 2, and a screw 10 is screwed from the bottom cover 9 to the mounting piece 8. The tank 4 is fixed by tightening the screw 10.

An inner plug 12 is airtightly and removably attached to the upper end opening of the tank 4 via a packing 13. This inner stopper 12 has an air introduction path 16 connecting an inflow hole 14 on the upper surface and an outlet port 15 on the lower surface, and a flat ring-shaped packing 17 is attached to the inner peripheral edge of the inflow hole 14, and the air introduction path A check valve 18 for opening and closing the inflow hole 14 is disposed in the middle of the inflow hole 16 .

An inverted bowl-shaped upper lid 20 is rotatably provided on the upper surface of the support ring 3 via a pin 21.
A recess 22 is formed at the top, and a substrate 23 is attached to the opening at the bottom. And this top lid 20
A bellows 24 constituting a fluid pumping device is housed inside. This bellows 24 has a support plate 2 at its lower end.
5, an outflow tube 26 is integrally formed in the center of the support plate 25 and slightly protrudes toward the lower surface thereof. It matches. An opening 30 is formed in the center of the upper end surface of the bellows 24, and a bellows valve 31 is slidably inserted into this opening 30. A spring 32 is provided between the bellows valve 31 and the support plate 25. spring 3
2, the bellows valve 31 is elastically urged upward. A locking claw 3 is provided at the lower end of the bellows valve 31.
3 is integrally formed, and this locking pawl 33 engages with the lower edge of the opening 30, and this engagement prevents the bellows valve 31 from coming off.
The entire bellows 24 together with the bellows valve 31 is elastically urged upward by the spring 32. A tapered valve seat 34 is formed on the inner peripheral edge of the upper end of the opening 30, and a packing 35 is provided on the bellows valve 31 facing the valve seat 34. The inside of the bellows 24 normally has a cutout window 3 on the circumferential surface of the bellows valve 31.
When the bellows valve 37 is lowered and the packing 35 abuts against the valve seat 34, the opening 30 is sealed and communication with the atmosphere is cut off. Bellows 24
A reinforcing plate 36 is provided on the upper end surface, and this reinforcing plate 36 is formed to have a size that is approximately the same as or larger than the outer diameter of the bellows 24, and is fitted into the outer peripheral portion of the opening 30. The bellows 24 is integrally attached to the bellows 24.

A push body 40 is housed in the recess 22 of the upper lid 20 so as to be movable up and down, and a press cylinder 41 is slidably inserted upward from the center of the bottom of the recess 22, and the upper end of the press cylinder 41 is screwed. Push body 40 via 42
is connected to. The press cylinder 41 has an inner periphery as a holding part 47, and is integrally provided with a flange 43 at the lower end, which abuts against the upper surface of the bellows valve 31, and from the center of the upper surface of the bellows valve 31. A fitting protrusion 44 projects integrally, and is slidably fitted into a holding portion 47 on the inner circumference of the pressing cylinder 41.

An outflow pipe 50 is attached to one side of the bottom of the tank 4 by crimping or the like, and the upper end of this outflow pipe 50 projects slightly above the inner bottom surface of the tank 4. The support ring 3 has a guide path 5 that is approximately in the shape of an inverted U.
1 is formed, and a check valve 5 is provided at one end of this guide path 51.
A conduction pipe 53 is connected via 2. Joints 54 and 55 made of rubber, for example, are attached to the lower end of the conduit pipe 53 and the lower end of the outflow pipe 50, respectively. Both the joints 54 and 55 are connected to each other via a connecting tube 56, and a protrusion 57 that continues along the circumferential direction is integrally formed at the intermediate portion of the outer periphery of the connecting tube 56. An outflow pipe 58 is formed at the other end of the guide path 51, and a lead-out pipe 59 is fitted on the outer periphery of the outflow pipe 58. is used as the outlet 60. Therefore, the outflow pipe 50 and each joint 5
4, 55, conduction pipe 53, guide path 51, outflow pipe 58
The inside of the tank 4 and the outlet port 60 are connected to each other by the outlet pipe 59.
A series of flow paths 61 are configured to connect the two. A spouting pipe 64 overlaps the outer periphery of the outlet pipe 59, and this spouting pipe 64 is supported via a decorative plate 65 attached to the front surface of the exterior case 1 so as to be able to move up and down. The outer periphery of the spouting tube 64 is covered with a cover 67 that is integrally connected to the spouting tube 64 via a screw 66, and a spout 68 at the tip of the spouting tube 64 protrudes from the lower end surface of the cover 67. .

A heater 69 is wound around the outer peripheral surface of the lower end of the tank 4, and the liquid in the tank 4 is heated by the heater 69, and its temperature is maintained constant via a thermostat 70. Also 71
72 is a handle, and 73 is a locking mechanism for the top cover 20.

Next, the effect will be explained. When the pushing body 40 is pressed, the pressing cylinder 4 is integrally moved with this pushing body 40.
1 and bellows valve 31 are lowered. As the bellows valve 31 descends, the packing 35 abuts against the seat 34, and the opening 30 of the bellows 24 is sealed.
The air inside is compressed, and this compressed air flows into the tank 4 through the air introduction path 16. This inflow pressurizes the liquid level in the tank 4, and this pressurization causes the liquid to flow into the outflow pipe 5.
0 through the conduction pipe 53 and is pushed up above the rated liquid level in the tank 4, and the outlet pipe 5
9 and is drawn out from the outlet 60 , and further passed through the outlet pipe 64 and poured out from the outlet 68 .

When the pressure of the push body 40 is released, the spring 3
2, the bellows valve 31 rises and the packing 35 separates from the seat 34. In response, air flows into the bellows 24 from the outside through the opening 30, and with this inflow, the bellows 24 becomes compressed. At the same time, the pushing body 40, the pushing cylinder 41, and the bellows valve 31 return to their original positions. By repeating such operations, the liquid in the tank 4 is sequentially poured out.

When the bellows valve 31 descends, the force of the bellows valve 31 is first transmitted to the reinforcing plate 36, and under the force of this reinforcing plate 36, the upper end surface of the bellows 24 as a whole is displaced downward on the average. In response, the upper end peripheral edge of the bellows 24 is pressed by the reinforcing plate 36, and the entire bellows 24 is compressively deformed by this pressing.
In this way, the bellows 24 is not pressed locally at the center of its upper end surface as in the conventional case, but the entire upper end surface is pressed evenly through the reinforcing plate 36, so that the bellows 24 The occurrence of sagging at the upper end peripheral edge portion is suppressed over a long period of time, so that the bellows 24 will not be deformed into an irregular shape.

A fitting protrusion 44 protrudes from the upper surface of the bellows valve 31, and this protrusion 44 is fitted into a holding portion 47 on the inner circumference of the pressing cylinder 41. Therefore, when the bellows valve 31 descends, the bellows valve 31 Unlike the conventional case, the bellows valve 31 does not lose its posture carelessly, and therefore the bellows valve 31 accurately descends along the axial direction of the bellows 24.
4 is compressed while always maintaining the proper shape.

The device of the present invention is not limited to being used by being incorporated into an air pot, but can also be incorporated into other equipment, and the fluid to be pumped is not limited to air, but can also be used with other fluids. There is no problem.

[Effect of idea]

As explained above, according to the present invention, it is possible to prevent the bellows from settling over a long period of time, and to maintain the proper posture of the bellows valve at all times.Therefore, the bellows can be compressed in an appropriate shape at all times and accurately compressed. A predetermined amount of fluid can be pumped to. Since a single spring biases the bellows valve in the opening direction and at the same time holds the bellows in an extended state, the number of parts is reduced.
Costs are reduced, the assembly process is simplified, efficient assembly can be achieved, and when the bellows is compressed, it is only necessary to press the pushing body against a single spring. It can be easily operated with light force. In addition, since the outer periphery of the opening of the bellows is always open to the atmosphere, when the opening is opened by releasing the pressure on the pushing body from the compressed state of the bellows, air immediately flows into the bellows almost at the same time. Therefore, there is an advantage that the bellows restores quickly and is easier to use.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional device, and FIG. 2 is a sectional view showing an embodiment of the present invention. 24... bellows, 30... opening, 31... bellows valve, 32... spring, 36... reinforcing plate, 41... pressing cylinder.

Claims (1)

[Scope of utility model registration request] A bellows having an opening at its end surface and the outer periphery of the opening being open to the atmosphere at all times, and a bellows valve that is attached to the opening of the bellows and opens and closes the opening by moving along the axial direction of the bellows. , a spring that elastically biases the bellows valve in the opening direction and holds the bellows in an expanded state with its biasing force; The formed reinforcing plate is provided to be vertically slidable in the recess, and its downward movement presses the bellows valve in the closing direction, transmitting the force from the bellows valve to the end face of the bellows via the reinforcing plate. a pushing body that compresses the bellows, the pushing body has a pushing cylinder having a flange at one end, the bellows valve is provided with a fitting protrusion, and the fitting protrusion is provided inside the pressing cylinder. The flange of the pressing cylinder contacts the bellows valve in this fitted state, and this contact causes the bellows valve to move in the closing direction in accordance with the downward movement of the pressing body. Fluid pumping device.