JP2520468Y2 - Diaphragm pump - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a diaphragm pump that vibrates a diaphragm by an operating pressure of an engine to perform a pumping action.

[Prior Art] A diaphragm pump is composed of a diaphragm and a pair of check valves. When a working pressure of the engine is applied to a pressure chamber formed on one side of the diaphragm, the diaphragm is vibrated and fuel is discharged from an intake port. The fuel is sucked into the pump chamber formed on the other side of the diaphragm through one check valve, and this fuel is pressure-fed to the discharge port through the other check valve.

[Problems of conventional technology]

The operating pressure for driving the diaphragm pump generally utilizes the crank chamber pressure or the intake pipe pressure of the engine, and when a backfire occurs in the engine, an abnormally high pressure is generated in the crank chamber and the intake pipe. There is a possibility that the diaphragm may be acted upon and the diaphragm may be damaged.

An object of the present invention is to prevent the diaphragm from being damaged by the abnormally high pressure of the backfire so as to prevent the diaphragm from being damaged.

[Means for solving problems]

In the present invention, a first buffer chamber connected to the engine, a second buffer chamber connected to the pump chamber, and a communication hole for connecting these buffer chambers are provided in the middle of the pressure passage for guiding the operating pressure to the pump chamber. However, the opening of the pressure passage and the communication hole to each buffer chamber is provided at a position that does not face each other in the buffer chamber.

[Action]

The operating pressure of the engine introduced into the pressure passage is the first
It acts on the pressure chamber of the diaphragm pump through the buffer chamber, the communication hole, and the second buffer chamber.

Since the pressure passage and the opening of the communication hole in each buffer chamber are provided at positions that do not face each other, abnormal high pressure such as backfire is sufficiently diffused and weakened in the first buffer chamber and the second buffer chamber. Accordingly, the diaphragm of the pump is not affected by the abnormally high pressure when a backfire occurs, and the diaphragm can be prevented from being damaged.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 is a diaphragm pump, and the pump 1 includes a diaphragm 2 and a pair of check valves 3 and 4. A pressure chamber 5 is formed on one side of the diaphragm 2 and a pump chamber 6 is formed on the other side, and the diaphragm 2 is vibrated by applying an operating pressure such as a crank chamber pressure of the engine or an intake pipe pressure to the pressure chamber 5. The volume of the pump chamber 6 is increased or decreased. By increasing or decreasing the volume of the pump chamber 6, the fuel is sucked into the suction port 7
Is sucked into the pump chamber 6 through the one check valve 3 and is pumped to the discharge port 8 through the other check valve 4.

Reference numeral 10 is a pressure passage for introducing the operating pressure of the engine into the pressure chamber 5, and a buffer chamber 11 is provided in the pressure passage 10. The buffer chamber 11 is composed of a first buffer chamber 11a and a second buffer chamber 11b, and these buffer chambers 11a and 11b do not face the buffer chamber 11a, 11b side openings 12, 13 of the pressure passage 10, respectively. A communication hole 14 that opens at a position is used for communication.

Therefore, the normal continuous operating pressure of the engine is passed through the buffer chamber 11 without resistance, and a momentary high pressure of the engine backfire or the like reaches the second buffer chamber 11b from the first buffer chamber 11a through the communication hole 14. Between these buffer chambers 11a, 11b
Is absorbed and weakened by.

 Reference numeral 15 is an engine and 16 is a crank chamber.

[Effect of device]

As described in detail above, according to the present invention, a first buffer chamber connected to the engine and a second buffer chamber connected to the pump chamber are provided in the middle of the pressure passage for guiding the operating pressure of the engine to the pump chamber. By arranging a communication hole that communicates with each other, and by providing the opening of the pressure passage and the communication hole to each buffer chamber at a position that does not face each other in the buffer chamber, the diffusion effect of abnormal high pressure such as backfire in each buffer chamber Therefore, the abnormally high pressure of the backfire and the like can be sufficiently weakened in the buffer chamber, and damage to the diaphragm of the pump can be prevented.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the diaphragm pump of the present invention. 2 ... diaphragm, 5 ... pressure chamber, 6 ... pump chamber,
10 ... Pressure passage, 11 ... Buffer chamber.

Claims (1)

(57) [Scope of utility model registration request] 1. A diaphragm pump in which a diaphragm is vibrated by an operating pressure of an engine to perform a pumping action, and a first buffer chamber connected to the engine is provided in the middle of a pressure passage for guiding the operating pressure to the pump chamber. A second buffer chamber connected to the pump chamber and a communication hole that connects these buffer chambers to each other are provided, and openings of the pressure passage and the communication hole to each buffer chamber are provided at positions that do not face each other in the buffer chamber. And diaphragm pump.