JPS59175674A - Bellows - Google Patents

Abstract

PURPOSE:To prevent a bellows from being fat in its middle part as well as crashed by fitting the first board member 1 in asmall-diameter part of the periphery part of a bellows and the second board member in a large-diameter part of an inner circumference with contact kept. CONSTITUTION:The first board member 2 is fitted in a small diameter part 3 of the periphery of a bellows 1, while the second board member 5 with a penetratiing hole 4 is fitted in an inner circumferential part with contact kept. In this way, the bellows 1 is supported by the first and the second board members 2 and 5. Therefore, it an external pressure of the bellows 1 become higher than its internal pressure, the bellows 1 is not crashed, while on the contrary, even if the internal pressure becomes higher than the external pressure, it is prevented from being fat in the middle part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that a fitting hole of a first plate member is contact-fitted to a small diameter portion of the outer periphery of a bellows, and an outer periphery of a second plate member is contact-fitted to a large diameter portion of the inner periphery of the bellows. This relates to a bellows that is fitted together.

Generally, bellows are made of soft base resin, etc., so if a pressure difference occurs between the inside and outside of the bellows,
The bellows has the disadvantage that it cannot be used in places where pressure differences occur because the bellows becomes thick or collapsed.It is an object of the present invention to provide a bellows that can eliminate the above-mentioned disadvantages. This is the purpose.

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes a telescopic bellows made of a soft bottom resin or the like similar to the conventional one, and a first plate member 2 is fitted into the fitting hole 3 in contact with the small diameter part of the outer circumference of the bellows 1. It is attached together. Furthermore, a second plate member 5 having a through hole 4 in the center is attached to the large diameter portion of the inner circumference of the bellows 1 so that its outer circumference is in contact with the second plate member 5.

Figure 2 shows the bellows constructed above applied to a gray water pump, 11 is a cylinder, and the bottom plate 12 has a first cylinder.
A water hole 14 with a valve 13t is provided, and an opening 16 is formed in the top plate 15 thereof. The upper end of the bellows 1 is in close contact with the periphery of the opening 16, and a water guide hole is provided in the through hole 4 of the second plate member which is fitted in contact with the large diameter portion of the circumference of the bellows 1. 17 and a rod 8 having a length equal to or longer than the length of the cylinder 11 is arranged to be movable up and down. A piston 20 having a chamber 19 and having a diameter slightly smaller than the large diameter of the bellows 1 is integrally formed at the lower end of the rod 18 to connect the water guide hole 17 and the chamber 1.
9 is in communication. The lower end of the bellows l is in close contact with the upper surface of the piston 20, and a plate member 2 having a water passage hole 22 with a second valve 21 in the center on the lower surface thereof.
3 are in close contact and block the chamber 19. Reference numerals 24 and 25 denote a filter member p for preventing gravel etc. from entering the cylinder 1, 26 a connecting rod for moving the entire rod 18 up and down, and 27 a filter member p for preventing the water rising through the water introduction hole 17 from entering the cylinder 1. 28 is a guide plate that prevents the rod 8 from wobbling in the lateral direction.Next, we will explain the action of the pump that is grooved from above. Put 11 into the water. At this time cylinder 11
The bellows l contracts due to its own weight and enters the water in the following state. When the cylinder 11 reaches the bottom of a well etc., the rod 18 is lowered to extend the bellows 1, and then the rod 1
8 is raised, the bellows 1 contracts, the first valve 13 opens, and water flows into the cylinder 1]. As a result, the volume of 1 yen of key rose decreases, and gfJt in cylinder 1
increases, so the pressure inside the bellows 7 becomes higher than the pressure inside the cylinder 1 (particularly at the moment when the rod 18 rises, σ), but the first plate member 2 causes the bellows 1 to I never get into a state of 9.

After the rod 18 has finished rising, the rod 14 is lowered. At this time, the bellows 1 expands and the second valve 21
opens and the first valve 13 closes, so the water in the cylinder 11 approaches the second valve 21, enters the piston 200 chamber 19, and enters the water introduction hole 17. By repeatedly moving the rod 18 up and down, the water that has entered the water guide hole 17 rises and is pumped up. When the water conduit pipe is lowered, the 1 m2 valve 21 opens (so the water pressure from the water level that has risen through the water conduit hole 17 is applied to the cylinder II, and the difference between the pressure in the bellows 7 and the X2 plate 5 increases. Therefore, the bellows 1 will not collapse.Q Figure 3 shows the above bellows applied to a fluid pressure cylinder that raises and lowers objects using water pressure, and 32 is a discharge port provided at the bottom of the cylinder 3.

33 is a valve. Components that are the same as those in FIG. 2 are designated by the same reference numerals, so their explanation will be omitted.

Next, the operation of the cylinder will be explained.

First, close the valve 33 and open the water guide hole 17 of the rod 18.
The liquid is allowed to flow into the cylinder 11. Then, when the water pressure inside the cylinder increases, the bellows 1 contracts in accordance with the increase, and the rod 18 rises. At this time cylinder 11
The pressure between the bellows 1 and the bellows 1 is higher than the pressure inside the bellows 1 (although the bellows 1 will not be crushed by the second plate member 5. Then, the valve 33t-opens and the cylinder 11
When the water is discharged from the inner X1c outlet 32, the water pressure decreases and the rod 18 descends due to its own weight. Note that cylinder 1
1 through the water introduction hole 17 of the rod 18.

It may be made to flow directly into the cylinder 11, and here we have explained the case where 75C is used.
Of course, oil may also be used.

As described above, the present invention allows the fitting hole of the first plate member to contact and fit into the small diameter portion of the outer peripheral portion of the bellows.

Furthermore, since the outer periphery of the second plate member having a through hole in the center is fitted in contact with the large diameter part of the inner periphery, even if the external pressure of the bellows becomes higher than the internal pressure.・It has the effect that the bellows will not collapse and will not become overweight even if the internal pressure becomes higher than the external pressure.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the bellows of the embodiment, FIG. 2 is a sectional view of the submersible pump, and FIG. 3 is a sectional view of the fluid pressure cylinder. l... Bellows 2... First plate member 3.
・Insertion hole 4 ・Through hole 5 ・Second plate member 1 Diagram 3L Complete 2 diagram

Claims (1)

[Claims] l. The insertion hole of the first plate member is brought into contact with the 7-diameter portion of the outer periphery of the bellows, and the outer periphery of the second plate member having a through hole in the center is brought into contact with the large diameter portion of the inner periphery. A bellows characterized by being fitted.