JPH0714179U - Diaphragm pump - Google Patents

Abstract

(57) [Summary] (Modified) [Object] The present invention provides a diaphragm pump having a simple structure and capable of easily preventing deformation of the diaphragm due to an increase in pressure in the pump chamber even if a thin diaphragm is used. To do. [Structure] The diaphragm pump of the present invention has a casing 8 which is hermetically covered with a diaphragm 5 to form a pump chamber, an inlet 14 and an outlet 16 are formed in the casing 8, and the pump is driven by a drive shaft attached to the diaphragm 5. The flange portion 10a is provided at the portion where the drive shaft is attached to the diaphragm 5, so that the diaphragm 5 is prevented from being deformed by this flange portion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a diaphragm pump.

[0002]

[Prior art]

 The conventional diaphragm pump has, for example, the configuration shown in FIGS. 4 to 6. In this diaphragm pump, an eccentric shaft 2 is fixed to an output shaft 1a of a motor 1, and a connecting rod 4 is attached to the eccentric shaft 2 via a bearing 3. A diaphragm 5 is sandwiched between the tip portion 4 a of the connecting rod 4 and the retainer 6. The outer periphery of the diaphragm 5 is clamped and fixed to the casing 8 by the pressing plate 7, and thereby the pump chamber 9 is sealed. Further, there are an intake chamber 13 and an exhaust chamber 14 which are sealed by a gasket 11 and a cover plate 12, and these communicate with an intake port and an exhaust port which are not shown, respectively. An intake valve 14 is arranged on the pump chamber side between the pump chamber 9 and the intake chamber 13, and an exhaust valve 16 is arranged on the exhaust chamber side between the pump chamber 9 and the exhaust chamber 15.

In the diaphragm pump having such a structure, when the motor 1 is driven to rotate the output shaft 1a, the connecting rod 4 moves up and down and the diaphragm 5 is continuously deformed to perform a pumping action. . That is, when the state of FIGS. 4 and 5 is changed to the state of FIG. 6, the gas in the pump chamber 9 is compressed and exhausted from the exhaust port through the exhaust chamber 15. Further, when the state of FIG. 6 is changed to the states of FIGS. 4 and 5, the air is sucked from the suction chamber 13 on the contrary.

[0004]

[Problems to be solved by the device]

 In the conventional diaphragm pump having such a structure, when the state shown in FIG. 4 is changed to the state shown in FIG. 6, the pressure in the pump chamber 9 becomes high, and the diaphragm 5 becomes as shown by a portion 5a in FIG. The diaphragm stretches and the volume of the swelling pump chamber 9 decreases less, and sufficient exhaust cannot be performed.

In order to eliminate such a defect, a diaphragm pump having a thickened diaphragm or a cloth-containing diaphragm is also known, but it is not preferable because the diaphragm moves poorly.

Especially in the case of a small pump, the energy loss becomes large. Further, the diaphragm becomes expensive, and the cost becomes high.

An object of the present invention is to provide a diaphragm pump which has a simple structure and can easily prevent deformation when the pressure inside the pump chamber increases even when a thin diaphragm is used.

[0008]

[Means for Solving the Problems]

 The diaphragm pump of the present invention is constructed such that the diaphragm is airtightly fixed to a casing having a recess, a pump chamber is provided between the casing and the diaphragm, an intake port and an exhaust port are formed in the casing, and a drive shaft is attached to the diaphragm to drive the diaphragm. The diaphragm is deformed by the drive of the shaft to change the volume of the pump chamber to perform the pumping action.The flange of the drive shaft is attached to the diaphragm. Deformation of the diaphragm when the pressure increases is controlled by this collar.

Further, the diaphragm pump of the present invention has the above-mentioned structure, and in particular, the shape of the surface of the collar portion on the diaphragm side is equal to the shape of the diaphragm when the volume of the pump chamber becomes small. It has a shape similar to or similar to this, so that the deformation of the diaphragm is surely prevented and the pump action can be effectively performed.

[0010]

【Example】

 Next, an embodiment of the diaphragm pump of the present invention will be described with reference to the drawings. 1 to 3 are views showing an embodiment of a diaphragm pump of the present invention, in which 1 is a motor, 1a is an output shaft of a motor 1, 2 is an eccentric shaft, 3 is a bearing, 4 is a connectin rod, Reference numeral 5 is a diaphragm, 6 is a retainer, 7 is a holding plate, 8 is a casing, 11 is a gasket, 12 is a cover plate, 13 is an intake chamber, 14 is an intake valve, 15 is an exhaust chamber, and 16 is an exhaust valve. Reference numeral 9 is a pump chamber formed between the casing 8 and the diaphragm 5. These structures are substantially the same as those of the conventional diaphragm pump shown in FIGS.

In the embodiment of the present invention, a drive shaft for deforming the diaphragm 5 to perform a pumping action, that is, a holding portion (diaphragm mounting portion) 10 collar portion 10a of the tip portion of the connecting rod 4 in the drawing is provided. It is a feature. In this embodiment, the holding portion 10 is formed to have a larger area than the portion fixed to the diaphragm 5, and the collar portion 10a other than the fixed portion is in a state of being separated from or in contact with the diaphragm 5.

By thus forming the holding portion 10 in the shape in which the collar portion 10 a is provided around the portion fixed to the diaphragm 5, there is no hindrance to the deformation of the diaphragm 5 itself due to the upper and lower portions of the connecting rod. When the pump action is performed and the volume of the pump chamber decreases and the pressure in the pump chamber increases as shown in FIG. 3, the diaphragm keeps pushing like the conventional example (as shown in FIG. 6). Prevent this. Therefore, even when the volume of the pump chamber is the minimum, the pressure inside the pump chamber can be maintained at a sufficient pressure, and the efficient pump action can be continued.

In this embodiment, the holding portion 10, particularly the portion outside the portion to which the diaphragm is fixed (the collar portion 10a) is not fixed to the diaphragm and can hold the diaper of the diaphragm. As described above, it is most preferable that the shape on the diaphragm side is the same as the shape of the diaphragm having no blisters when the volume in the pump chamber is minimized, and at least a shape similar to this is preferable.

This embodiment is based on the pump having the structure shown in FIGS. 4 to 6 shown as a conventional example. However, the present invention is not limited to this, and the drive shaft (connecting rod of the embodiment is not limited to the diaphragm. The tip of the shaft (corresponding to the shaft) is fixed and the diaphragm is deformed by the reciprocating motion of the drive shaft, etc. to perform the pumping action. It is possible to achieve the object of the present invention, which is to perform a pumping action on the.

In the above embodiment, the connecting rod and the holding portion to which the diaphragm is attached are integrally formed, but they may be formed separately and the holding portion may be fixed to the connecting rod.

[0016]

[Effect of device]

 The diaphragm pump of the present invention has an extremely simple structure in which a collar is provided around the holding part for fixing the diaphragm at the tip of the drive shaft of the conventional diaphragm pump, and the diaphragm is thickened or made of a special material. It is possible to prevent a bulge due to an increase in the pressure of the pump chamber without doing so, and thus to perform a good pumping action without lowering the compression ratio of the pump.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a diaphragm pump of the present invention.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a front view when the pump chamber of the embodiment has a minimum volume.

FIG. 4 is a front view of a conventional diaphragm pump.

FIG. 5 is a side view of the above conventional example.

FIG. 6 is a front view of the above conventional example when the pump chamber has the smallest volume.

[Explanation of symbols]

 1 Motor 1a Output shaft 2 Eccentric shaft 4 Connecting rod 5 Diaphragm 8 Casing 10 Holding part 10a Collar part

Claims (2)

[Scope of utility model registration request] 1. A casing having a concave portion, a diaphragm fixed to the casing so as to cover the concave portion, and a drive shaft attached to the diaphragm to deform the diaphragm. The casing and the diaphragm form a pump chamber and the casing. A pump that has an intake port and an exhaust port that communicate with the pump chamber and that continuously deforms the diaphragm by driving the drive shaft to perform a pumping action, with a collar portion around the diaphragm mounting portion of the drive shaft. Diaphragm pump characterized by being provided. 2. The shape of the surface of the collar portion on the diaphragm side is similar to the shape of the diaphragm when the volume of the pump chamber is the smallest.
Diaphragm pump.