JPH09242702A - Accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a bladder of an inexpensive material and to simplify its structure by forming an orifice hole in the bladder for dividing a shell empty chamber into a port flow-in chamber and an orifice flow-in chamber, the orifice hole being for communicating both chambers. SOLUTION: An empty chamber 5 in a shell 2 is divided into an orifice flow-in chamber 19 and a port flow-in chamber 20 by a bladder 14 and an orifice hole 18 for communicating the orifice flow-in chamber 19 and the port flow-in chamber 20 to each other is formed in the bladder 14. The material of the bladder 14 is a resin or rubber and gas transmissivitiy is not a problem. An impact pressure produced in a piping line is caused to flow into the port flow-in chamber 20, the bladder 14 is pressed to the orifice flow-in chamber 19 and simultaneously a fluid is caused to flow from the orifice hole 18 into the orifice flow-in chamber 19. The moment the pressure of the port flow-in chamber 20 becomes smaller than that of the orifice flow-in chamber 19, the fluid of the orifice flow-in chamber 19 is caused to flow out through the orifice hole 18 to the port flow-in chamber 20 side. By repeating this operation, an impact face is absorbed. Thus, a shape is made small and an inexpensive material is provided.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an accumulator. In particular, the present invention relates to an accumulator that absorbs pulsation of fluid flowing in water and prevents impact noise.

[0002]

2. Description of the Related Art FIG. 3 is a half sectional view of an accumulator 70 showing a prior art of the present invention.

FIG. 3 shows a water supply accumulator 70 in which a resin bladder 74 is extendably mounted in an accumulator chamber 73 surrounded by a shell 71 and an end cover 72. This bladder 74 is provided in the accumulator chamber 7
The interior of 3 is divided into a liquid chamber 75 and a gas chamber 76. The mounting portion 77 of the bladder 74 includes a shell 71 and an end cover 72.
The liquid chamber 75 and the gas chamber 76 are sealed by being sandwiched between the joint portions of the tapered surfaces of and, and by attaching O-rings 79 to the O-ring grooves 78 on the tapered surfaces, respectively. The connection of the end cover 72 to the shell 71 is
The open end 80 of the shell is crimped.

The end cover 72 is formed with a protrusion 81 protruding into the liquid chamber. The protruding portion 81 and its outer peripheral side are formed into a step portion 82. The end surface of the protruding portion 81 serves as a stopper surface 84, and the stopper surface 84 defines the minimum contraction position so that the bladder 74 is not damaged when contracted.

The protruding portion 81 of the end cover 72 has
An inflow / outflow port 85 communicating with the liquid chamber 75 is formed. Further, on the outside of the port 85, a screw 86 that joins with the pipe is formed.

On the other hand, a bladder 74 is provided on the top of the shell 71.
Gas filling hole 8 communicating with a gas chamber 76 formed outside
7 are formed. A plug 83 for sealing the gas chamber 76 is detachably attached to the gas filling hole 87.

Since the bladder 74 must be made of a gas impermeable material, elastic flexible layers are integrally bonded to the front and back of the gas barrier layer with an adhesive.

[0008]

Even in the accumulator configured as described above, it is difficult to prevent gas permeation of the bladder 74. Therefore, in the long term, the gas in the gas chamber 76 passes through the bladder 74 and flows out into the liquid chamber 75, so that the function of the gas chamber 76 cannot be exerted.
Further, the adhesive layer of the bladder 74 may be peeled off and damaged.

Further, in order to seal the mounting portion 77 of the bladder 74, the O-ring 7 is provided on the gas chamber 76 side and the liquid chamber 75 side.
I have to wear 9. Therefore, it becomes difficult to assemble the shell 71 and the end cover, and the O-ring 7
It is also difficult to perform pressure bonding so as to exert the sealing ability of No. 9.

The present invention has been made in view of the above problems, and its technical problem is that the material of the bladder can be an inexpensive material that is not related to gas permeation and that the mounting portion of the bladder can be The purpose is to eliminate the seal structure and make it a simple structure. And, it is to be able to effectively absorb the pulsation of the fluid.

[0011]

The present invention has been made in view of the above problems, and the technical means for solving the present invention is configured as follows. That is, a shell having an inner cavity and a fluid inflow hole communicating with the inner cavity and a bladder for partitioning the inner cavity into a port inflow chamber directly communicating with the inflow hole and an orifice inflow chamber on the opposite side of the port inflow chamber are provided. However, the bladder is formed with an orifice hole communicating from the port inflow chamber to the orifice inflow chamber.

[0012]

The fluid flowing from the inflow hole 9 is supplied to the port inflow chamber 20.
Act on. And this fluid is the extension 1 of the bladder 14.
6 to press the orifice inflow chamber 19 side. At the same time, it flows into the orifice inflow chamber 19 through the orifice provided in the bladder 14. Next, when the pressure in the orifice inflow chamber 19 increases and becomes greater than that in the port inflow chamber 20, the pressure fluid flows from the orifice inflow chamber 19 to the port inflow chamber 20.
Leaked to The flow rate passing through these orifices has a large difference between the flow rate at the time of inflow and the flow rate at the time of outflow, and therefore gradually acts as a damping effect.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An accumulator according to a preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the accumulator of the present invention. In FIG. 1, 2 is a shell. Shell 2
Is a plate material having substantially the same thickness and formed in a bottomed cylindrical shape.
In the shell 2, one end of the tubular portion 3 is formed in the crimp portion 4.

The end cover 6 is fitted on the side of the shell portion 2 of the shell 2 which is to be swaged, and the swaged portion 4 is bent and locked to the step portion 8 of the end cover 6. The end cover 6 has an inflow hole 9 and a pipe screw 12 formed at one end of the inflow hole 9 so as to be connected to a water pipe.

Further, the other end side of the inflow hole 9 is formed in a support portion 10 for supporting the bladder 14 so as not to contract beyond the limit when the bladder 14 contracts. Further, the supporting portion 10 has a supporting surface 13 with which the bladder 14 contacts, and a groove 11 is formed on the supporting surface 13 side so that the fluid can act on the entire bladder.

The mounting portion 15 of the bladder 14 is sandwiched between the fitting between the shell 2 and the end cover 6.
The bladder 14 partitions the empty chamber 5 in the shell 2 into an orifice inflow chamber 19 and a port inflow chamber 20, and
The bladder 14 is formed into a bellows shape so that it can expand and contract, and an extension portion 16 is provided.

The bladder 14 has an orifice hole 18 communicating with the orifice inflow chamber 19 and the port inflow chamber 20. The number of the orifice holes 18 may be one or plural, and the number thereof is set according to the impact force. The orifice hole 18 is preferably circular, but can be an elliptical shape, a square shape, or a hole having a radial slit on the outside of the circle.

The material of the bladder 14 is a resin material, but it may be a rubber material. As long as the material has tensile strength, gas permeability does not have to be a problem. For this reason,
It becomes possible to use inexpensive materials. Also, shell 2
Is formed by deep drawing from copper, stainless steel, steel plate, or the like.

An O-ring 21 is attached to an engagement surface between the shell 2 and the end cover 6 in an O-ring groove 22 provided in the end cover 6 so as to prevent fluid from leaking to the outside. It should be noted that the joint surface between the bladder 14 and the end cover 6 also has O
The ring 21 is provided, but there is no problem even if it is not provided at this location because it is fluid on both sides.

In the accumulator of the present invention constructed as described above, the pressure in the port inflow chamber 20 is maintained at the same pressure as the pressure in the pipe connected to the inflow hole 9. However, when an impact pressure is generated in the pipe, this impact force flows into the port inflow chamber 20 and acts on the bladder 14. The bladder 14 is pressed toward the orifice inflow chamber 19 side, which is smaller than the pressure in the port inflow chamber 20. At the same time, the fluid flows from the orifice hole 18 of the bladder 14 into the orifice inflow chamber 1
Flow into 9

At the moment when the pressure in the port inflow chamber 20 becomes lower than the pressure in the orifice inflow chamber 19, the fluid in the orifice inflow chamber 19 flows out to the port inflow chamber 20 side through the orifice hole 18. Since the flow rate difference between the repeated inflow and outflow is large, a damping effect is provided, and the impact force can be effectively absorbed. The diameter d of the orifice inlet hole 18 can be obtained from the following formula.
Here, Q is the flow rate passing through the orifice, and dp is the pressure difference between the two materials.

[0023]

[Equation 1]

FIG. 2 is a half sectional view of an accumulator according to another embodiment of the present invention.

In FIG. 2, the difference from the accumulator 1 shown in FIG. 1 is that the volume of the orifice inflow chamber 19 is larger than that of the bladder 14.

Further, the stopper 7 of the end cover 6 is made small, and the volume of the port inflow chamber 20 is also made large. Further, the orifice hole 18 is provided in the top plate 23 and the extension portion 16. Then, the mounting portion 1 of the bladder 14 made of rubber material
5 is sandwiched between the shell 2 and the end cover 6 via a spacer 24 made of resin or rubber. The spacer 24 is for protecting the mounting portion 15 of the bladder 14.

The accumulator 1 constructed as shown in FIG. 2 described above.
Is to increase the volume of the orifice inflow chamber 19 to increase the impact absorbing power.

Although the material of the bladder 14 is made of rubber, it can be made of resin. Since this material does not need to prevent gas permeation, it can be manufactured with an inexpensive material and is extremely easy to assemble.

[0029]

The accumulator of the present invention exhibits the effect of absorbing pulsation and impact force by providing the bladder with an orifice hole. Further, since the gas in the gas chamber does not permeate the bladder to deteriorate the function, the durability as an accumulator is dramatically improved. Further, since a gas chamber that absorbs pressure is not required, it can be expected that the shape of the accumulator as a whole will be small. Furthermore, since a gas charging valve is not necessary, safety for home use is guaranteed from an accident caused by the valve.
Moreover, since the bladder does not matter whether it is gas permeable or not, it is possible to use an extremely inexpensive material.

[Brief description of drawings]

FIG. 1 is a half cross-sectional view of an accumulator showing an embodiment of the present invention.

FIG. 2 is a half sectional view of an accumulator showing another embodiment of the present invention.

FIG. 3 is a sectional view of a conventional accumulator.

[Explanation of symbols]

 1, 70 …… Accumulator 2, 71 …… Shell 3 …… Cylindrical part 4 …… Crimping part 5 …… Vacancy 6, 72 …… End cover 7 …… Stopper 8, 82 …… Step part 9 …… Inflow hole 10 ... Supporting part 11 ... Groove 12 ... Pipe screw 13 ... Supporting surface 14, 74 ... Bladder 15, 77 ... Mounting part 16 ... Extension part 17, 23 ... Top plate 18 ... Orifice hole 19 …… Orifice inflow chamber 20 …… Port inflow chamber 21, 79 …… O ring 22, 78 …… O ring groove 24 …… Spacer 73 …… Accumulator chamber 75 …… Liquid chamber 76 …… Gas chamber 80 …… Open end 81: Protruding part 83: Plug 84: Stopper surface 85: Port 86: Screw 87: Gas filling hole

Claims (1)

[Claims] 1. A shell (2) having a void (5) inside and a fluid inlet (9) communicating with the void (5) and the void (5), the inlet (9). ) Has a bladder (14) for partitioning into a port inflow chamber (20) directly communicating with the port) and an orifice inflow chamber (19) on the opposite side of the port inflow chamber (20), and the bladder (14) has the bladder (14). An accumulator characterized in that an orifice hole (18) communicating from 20) to the orifice inflow chamber (19) is formed.