JP2001140762A - Diaphragm device equipped with non-reversing diaphragm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diaphragm device equipped with a non-reversing diaphragm preventing a diaphragm in operation from reversing, noise, reduction of discharge due to a capacity loss, having excellent durability to allow a long and stable use. SOLUTION: In this diaphragm device, fluid is sucked and discharged to a pressure chamber by the reciprocation of a diaphragm piston attached with a diaphragm, and a pressure adjusting chamber acting so as not to reverse the diaphragm while being practically partitioned by a negative pressure diaphragm is formed on the reverse side of the pressure chamber through the diaphragm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm device having a non-reversing diaphragm mechanism, which comprises:
For example, it is used as a diaphragm pump.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view showing an example of a conventional diaphragm pump having a diaphragm mechanism.

In FIG. 2, a diaphragm rod 110 is shown.
A pair of piston members 141 and 145 are fixed to the front end of the diaphragm 140 so as to sandwich the center of the diaphragm 140. In addition, the periphery of the diaphragm 140 is
And a housing member 160 located at the rear end of the pressure chamber forming member 150 for holding the pressure chamber. A check valve 151 for suction and a check valve 155 for discharge are formed at one end (below the drawing) and the other end (above the drawing) of the pressure chamber forming member 150, respectively. Vibration means (not shown) for reciprocating the rod 110 in the directions shown by arrows (a) and (b) is substantially connected to the rear end of the diaphragm rod 110.

When the diaphragm rod 110 moves in the direction of the arrow (a) under such a configuration, the diaphragm 140 moves in the direction of the arrow (a) together with the piston members 141 and 145. As a result, the volume of the pressure chamber 180 expands and becomes a negative pressure (negative pressure), and the check valve 155 for discharge becomes “closed” and the check valve 151 for suction becomes “open”. Aspirate fluid.

Next, when the diaphragm rod 110 moves in the direction of the arrow (b), the piston members 141 and 145 are moved.
At the same time, the diaphragm 140 moves in the direction of the arrow (b). As a result, the volume of the pressure chamber 180 is compressed and becomes positive pressure (positive pressure), the check valve 151 for suction is "closed", and the check valve 155 for discharge is "open".
The fluid in the pressure chamber 180 is discharged through the check valve 155.

[0006] These series of operations are repeated, and the discharge from the pump is performed continuously.

[0007]

However, the conventional diaphragm mechanism as shown in FIG. 2 has the following disadvantages. That is, the diaphragm 140
Is moved in the direction of the arrow (a), the pressure in the pressure chamber 180 becomes negative (the space 190 behind the pressure chamber is atmospheric pressure).
The diaphragm 140 takes a form that is inverted to the pressure chamber 180 side as shown by a dotted line in the figure.

Conversely, when the diaphragm 140 moves in the direction of the arrow (b), the pressure in the pressure chamber 180 becomes positive (the space 190 behind the pressure chamber is atmospheric pressure). As shown by the solid line, a configuration is adopted in which the space is inverted to the rear space 190 side. Such a phenomenon is called so-called inversion of the diaphragm 140, and causes the following problem. That is,

(1) Inversion noise is generated, and noise cannot be prevented. (2) Volume loss (equivalent to the volume 200 in FIG. 2) occurs, and the discharge amount decreases. (3) The diaphragm is damaged early due to bending fatigue. There are problems such as.

In FIG. 2, the size of the piston members 141 and 145 with respect to the diaphragm is smaller than the actual proportion so that the inverted state of the diaphragm can be easily understood.

The present invention has been made under such circumstances, and its object is to prevent the diaphragm from being inverted during operation, to prevent noise, and to prevent a decrease in the discharge amount due to volume loss. It is another object of the present invention to provide a diaphragm device having a non-reversing diaphragm mechanism which has excellent durability and can be used stably for a long period of time.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a diaphragm device which sucks and discharges a fluid into and from a pressure chamber by reciprocating a diaphragm piston mounted with a diaphragm. On the opposite side of the pressure chamber, there is formed a pressure adjusting chamber which is substantially partitioned by a negative pressure diaphragm and acts so as not to invert the diaphragm.

In the present invention, the pressure in the pressure adjusting chamber is set to be lower than the pressure in the pressure chamber during a period when the fluid is discharged from the pressure chamber to the outside and from the start of suction of the fluid into the pressure chamber until the suction is completed. Is also set to be small.

In the present invention, a piston rod is joined to the diaphragm piston portion,
A negative pressure diaphragm is arranged behind the diaphragm piston portion so as to form the pressure adjustment chamber,
A pressure adjusting piston is fixed to a position of a piston rod located at a rear portion of the negative pressure diaphragm. The pressure adjusting piston forms a pressure adjusting source chamber and a front chamber separately from each other. The chamber and the pressure adjustment chamber are connected to each other by a communication hole, and a check valve for maintaining the pressure adjustment chamber at a negative pressure is formed in the middle of the communication hole.

Further, in the present invention, a check valve is formed in the pressure adjustment source chamber, and the pressure adjustment source chamber is configured not to be substantially at or above atmospheric pressure.

Further, in the present invention, the pressure chambers are configured such that check valves for sucking and discharging a fluid are respectively formed.

Further, in the present invention, a reciprocating device is substantially connected to the piston rod so that a fluid can be sucked and discharged into the pressure chamber.

In the present invention, the front chamber is formed with a vent hole for opening to the atmosphere.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing a main part of a diaphragm pump which is a preferred example of a diaphragm device having a non-reversing diaphragm mechanism of the present invention.

As shown in FIG. 1, the diaphragm device 1 of the present invention can suck and discharge a fluid into and from the pressure chamber P by reciprocating a diaphragm piston portion 40 having a diaphragm 44 for discharge and suction. Has become. The diaphragm piston section 40 includes a diaphragm 44, a piston member 41 (front side) for fixing the diaphragm 44 from both sides, and an intermediate piston block 43 (rear side).

The piston rod 10 is substantially joined and fixed to the diaphragm piston portion 40.

In this embodiment, the peripheral edge of the ring-shaped diaphragm 44 is sandwiched and fixed between the front housing 50 and the rear intermediate housing 60. Can reciprocate. A check valve 51 for suction and a check valve 55 for discharge are arranged above and below the pressure chamber P so that the fluid can be sucked and discharged into the pressure chamber P by the reciprocating motion.

In the present invention, the most important and characteristic point is that the pressure regulating chamber S which acts on the opposite side of the pressure chamber P (behind the diaphragm 44) through the diaphragm 44 so as to prevent the diaphragm 44 from being inverted. Is formed.

In order to enable the pressure adjusting chamber S to perform the above-described action of preventing the diaphragm from reversing, the present invention adopts the following configuration.

That is, as shown in FIG. 1, the piston rod 10 is substantially joined to the diaphragm piston portion 40, and a negative pressure is formed behind the diaphragm piston portion 40 so as to form a pressure adjusting chamber S. A diaphragm 70 is arranged. The central portion of the negative pressure diaphragm 70 is held by the above-mentioned intermediate piston block and the piston member 45 (rear side) in order to secure a space for the pressure adjustment chamber S. In the present embodiment, the peripheral edge of the ring-shaped negative pressure diaphragm 70 is the intermediate housing 60.
And the rear housing 80, and the negative pressure diaphragm 70 is reciprocated with the piston rod 10.
Can reciprocate similarly to the diaphragm piston portion 40.

As shown in FIG. 1, a pressure adjusting piston 30 is fixed to a rear portion of the piston rod 10 to which the negative pressure diaphragm 70 is connected by a fixing nut 35. The pressure adjusting piston 30 forms the pressure adjusting source chamber H and the front chamber F separately. The compartment indicated by reference numeral F 'communicates with the front room F via the hole 65, and may be considered to be substantially the same as the front room F. Vent holes 81 and 85 for opening to the atmosphere are formed in the front chambers F and F ', respectively.

The pressure adjustment source chamber H and the pressure adjustment chamber S can be appropriately communicated with each other through the communication holes 11, 12, 13, and 14 in order to realize the operation of the present invention. . That is, in the middle of the communication holes 11, 12, 13, and 14 (between the communication holes 12 and 13 in this embodiment),
A check valve 20 for reducing the pressure inside the pressure adjustment chamber S to a negative pressure is formed. The operation of the check valve 20 will be described later in the description of the operation.

Further, a check valve 99 is formed in the pressure regulation source chamber H in the present invention, and the pressure regulation source chamber H
Is not substantially above atmospheric pressure.

The operation and operation of the present invention will be described below. Along with the movement of the piston rod 10 in the direction of the arrow (b), the pressure adjusting piston 30 moves in the direction of the arrow (b).

Then, the sealed pressure regulation source chamber H gradually expands, and the pressure decreases to a negative pressure. At this time, the negative pressure of the pressure adjustment source chamber H is reduced by the communication holes 11 and 12, the check valve 20,
And through the communication holes 13 and 14, the pressure adjustment chamber S is made negative pressure, and the diaphragm 44 and the negative pressure diaphragm 70 which substantially partition the pressure adjustment chamber S as shown in FIG. To a negative pressure.

The arrow (b) of such a piston rod 10
During the movement in the direction, the diaphragm piston portion 40 increases the fluid pressure in the pressure chamber P, closes the check valve 51 of the pressure chamber P, opens the check valve 55, and discharges the fluid to the outside. During this time, the check valve 20 remains open because the negative pressure of the pressure regulation source chamber H is increasing (becoming lower).

Thereafter, the discharge is completed and the piston rod 1
When 0 stops or moves in the opposite direction (the direction of the arrow (a)), the pressure adjustment source chamber H is compressed and the negative pressure decreases (the pressure increases), and the check valve 20 closes. By closing the check valve 20, the negative pressure in the pressure regulation chamber S does not decrease (the pressure increases) and is maintained.

Accordingly, the piston rod 10 moves in the direction of the arrow (a) to expand the volume of the pressure chamber P and reduce the pressure, while closing the check valve 55 of the pressure chamber P,
Even during the operation of opening 1 and sucking the fluid into the inside, the diaphragm 44 does not reverse.

The check valve 20 is opened when the next larger negative pressure comes from the pressure adjustment source chamber H, that is, with the movement of the piston rod 10 in the direction of the arrow (b) to open the pressure adjustment chamber S to a predetermined pressure. Keep negative pressure. Even if the negative pressure in the pressure adjusting chamber S decreases due to leakage or the like, the piston rod 10 opens with movement in the direction of the arrow (b), and acts to maintain the pressure adjusting chamber S at a predetermined negative pressure.

A check valve 99 is formed in the pressure adjustment source chamber H so that the increased pressure in the pressure adjustment source chamber H is released to the atmosphere.

As can be seen from the description of the operation, the pressure in the pressure adjusting chamber S in the present invention is from the start of suction of the fluid into the pressure chamber P to the completion of the suction while the fluid is being discharged from the pressure chamber P to the outside. Up to the pressure in the pressure chamber P.

Although not shown, a reciprocating device using, for example, an electromagnet or the like is substantially connected to the piston rod 10 so that a fluid can be sucked into and discharged from the pressure chamber P. Is

[0038]

As described in detail above, the present invention relates to a diaphragm device for sucking and discharging a fluid into and out of a pressure chamber by reciprocating a diaphragm piston mounted with a diaphragm. In addition, since it is substantially partitioned by the negative pressure diaphragm and is configured so that the pressure adjustment chamber which acts so as not to invert the diaphragm is formed, the inversion of the diaphragm during operation can be prevented, and as a result, It is possible to prevent the generation of noise and to prevent a decrease in the discharge amount due to a volume loss, and to guarantee the durability, thereby enabling a long-term stable use.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a diaphragm device provided with a non-reversing diaphragm mechanism of the present invention.

FIG. 2 is a schematic sectional view showing an example of a conventional diaphragm device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Diaphragm apparatus provided with non-reversing diaphragm mechanism 10 ... Piston rod 20 ... Check valve 30 ... Pressure adjusting piston 40 ... Diaphragm piston part 44 ... Diaphragm 51, 55 ... Check valve 70 ... Negative pressure diaphragm P ... Pressure chamber S … Pressure adjustment room H… Pressure adjustment source room F… Front room

Claims (7)

[Claims] 1. A diaphragm device for sucking and discharging a fluid into and from a pressure chamber by reciprocating a piston of a diaphragm mounted with a diaphragm. The diaphragm device is substantially partitioned by a negative pressure diaphragm on the opposite side of the pressure chamber via the diaphragm. A diaphragm device provided with a non-reversing diaphragm mechanism, wherein a pressure adjusting chamber for preventing the diaphragm from reversing is formed. 2. The pressure in the pressure adjustment chamber is set to be lower than the pressure in the pressure chamber while the fluid is discharged from the pressure chamber to the outside and from the start of suction of the fluid to the pressure chamber until the suction is completed. A diaphragm device comprising the non-inverting diaphragm mechanism according to claim 1, wherein the diaphragm device is set to: 3. A diaphragm rod is joined to the diaphragm piston portion, and a negative pressure diaphragm is arranged behind the diaphragm piston portion so as to form the pressure adjusting chamber. A pressure adjusting piston is fixed to a portion of a piston rod located at a rear portion, and the pressure adjusting piston separates and forms a pressure adjusting source chamber and a front chamber. The chambers are communicated with each other by a communication hole, and a check valve for maintaining a negative pressure in the pressure adjustment chamber is formed in the middle of the communication hole.
A diaphragm device provided with the non-reversing diaphragm mechanism according to 1. 4. The pressure adjusting source chamber according to claim 1, wherein a check valve is formed in the pressure adjusting source chamber so that the pressure adjusting source chamber does not substantially exceed the atmospheric pressure. A diaphragm device provided with the non-reversing diaphragm mechanism according to 1. 5. A diaphragm device comprising a non-reversing diaphragm mechanism according to claim 1, wherein a check valve for sucking and discharging a fluid is formed in each of the pressure chambers. 6. The piston rod according to claim 1, wherein a reciprocating device is substantially connected to said piston rod so as to be able to suck and discharge a fluid into and from a pressure chamber. A diaphragm device provided with an inverted diaphragm mechanism. 7. A diaphragm device provided with a non-reversing diaphragm mechanism according to claim 1, wherein a vent hole for opening to the atmosphere is formed in said front chamber.