JPH0663878U - Diaphragm pump - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a diaphragm pump suitable for discharging a small flow rate by preventing the solid content of slurry with strong sedimentation from settling and settling inside the pump chamber [Structure] The suction valve 2 that communicates with the bottom portion is provided in the lower portion of the pump chamber body 11 substantially vertically. A discharge valve 4 with a spring s, which communicates with the inlet side of the suction valve 2, is provided substantially horizontally at the same position as the bottom of the pump chamber 1. Further, a sub discharge valve 6 communicating with the upper part of the pump chamber 1 and a valve 7 connected to the sub discharge valve 6 are provided substantially vertically on the upper part of the pump chamber body 11, and the outlet side of the valve 7 is an air vent port and a sub discharge port. 8
And

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a diaphragm pump, and more particularly to a diaphragm pump suitable for discharging a small amount of slurry having a strong sedimentation property.

[0002]

[Prior art]

 A diaphragm pump that has been generally used in the past will be described with reference to the drawings. FIG. 3 is a sectional view showing the structure of a conventional diaphragm pump. The diaphragm 9 provided at the substantially central portion of the pump chamber body 11 is operated by the reciprocating motion of the shaft 10, and liquid is sucked into the pump chamber 1 through the suction port 3 of the suction valve 2 communicating with the bottom portion of the pump chamber 1, After filling the inside of the pump chamber 1 with the liquid, the discharge valve 4 provided in communication with the upper portion of the pump chamber 1 is opened to discharge the liquid from the discharge port 5. Diaphragm pumps are widely used in various industrial fields because they have good quantitative properties and can generate high pressure.

[0003]

[Problems to be solved by the device]

 Conventionally used diaphragm pumps can be used with almost no problem in the case of liquids that do not have sedimentation properties, such as water and gasoline, but slurries with strong sedimentation properties, for example, tens of cc to several hundreds. When it is used for the purpose of discharging at a small flow rate of cc, the solid content settles inside the pump chamber 1 and precipitates, gradually accumulating at the bottom of the pump chamber 1, and as shown in FIG. As shown, a precipitate t was sometimes generated. In addition, a precipitate (not shown) may be accumulated inside the discharge side pipe.

Since the deposit inside the discharge side pipe makes the operation of the discharge valve 4 unstable, a measure such as a horizontal pipe immediately from the upper part of the pump chamber 1 should be taken without vertical pipes. However, there was no effective countermeasure for the sedimentation and precipitation inside the pump chamber 1.

When the deposit t is generated at the bottom of the pump chamber 1, the suction valve 2 becomes unstable in operation due to the deposit t, the life of the diaphragm is shortened, and the slurry inside the pump chamber 1 Problems such as changes in slurry concentration due to solid settling have been a problem.

An object of the present invention is to provide a diaphragm pump that prevents solid contents of a slurry having a strong sedimentation property from settling and settling inside the pump chamber 1 and is suitable for discharging a small flow rate.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a diaphragm pump having a structure in which liquid is sucked into the pump chamber from the suction port of the suction valve by the reciprocating motion of the diaphragm, and the discharge valve is opened to discharge the liquid from the discharge port. A suction valve 2 communicating with the bottom of the pump chamber 1 is provided vertically at a position lower than the bottom of the pump chamber 1, and a discharge valve 4 communicating with the inlet side of the suction valve 2 is located at substantially the same position as the bottom of the pump chamber 1. Alternatively, it is a diaphragm pump which is provided substantially horizontally at a position lower than that and is provided with a sub discharge valve 6 and a valve 7 which communicate with the upper part of the pump chamber 1.

[0008]

[Action]

 In the diaphragm pump of the present invention, a suction valve 2 communicating with the bottom of the pump chamber 1 is provided substantially vertically at a position lower than the bottom of the pump chamber 1, and a discharge valve communicating with the inlet side of the suction valve 2. Since 4 is provided substantially horizontally at the same position as the bottom of the pump chamber 1 or at a position lower than that, the inside of the pump chamber 1 can be used even when a small amount of slurry having strong sedimentation is sucked in and discharged. No longer settles or precipitates, and no precipitate is formed at the bottom of the pump chamber 1. As a result, it is possible to discharge at a uniform concentration from the start to the end of the operation, and it is possible to extend the life of the diaphragm membrane because the diaphragm is not subjected to uneven stress.

[0009]

【Example】

 An embodiment of the diaphragm pump of the present invention will be described with reference to the drawings. The consideration is not limited to this embodiment.

Embodiment 1 FIG. 1 is a sectional view showing a structure of a diaphragm pump according to a first embodiment of the present invention. The diaphragm 9 used had a diameter of 100 mm. The installation positions of the suction valve 2, the discharge valve 4, etc. will be described. First, the suction valve 2 is provided in a lower portion of the pump chamber body 11 so as to be communicated with the bottom portion of the pump chamber 1 substantially vertically. Further, a discharge valve 4 with a spring s is provided substantially in the same position as the bottom of the pump chamber 1 so as to communicate with the inlet side of the suction valve 2 in a substantially horizontal position. Further, an auxiliary discharge valve 6 communicating with the upper part of the pump chamber 1 and a valve 7 connected to the auxiliary discharge valve 6 are provided on the upper part of the pump chamber body 11 substantially vertically, and the outlet side of the valve 7 serves as an air vent and an auxiliary discharge port. It was set to 8.

Embodiment 2 FIG. 2 is a sectional view showing the structure of the diaphragm pump of the second embodiment of the present invention. The second embodiment differs from the first embodiment in the positions of the suction valve 2 and the discharge valve 4, and the suction valve 2 is provided substantially vertically at a lower position apart from the pump chamber main body 11, and the suction valve 2 A discharge valve 4 with a spring s is branched from the inlet side and is provided substantially horizontally at a position lower than the bottom of the pump chamber 1.

When sucking and discharging the slurry using the diaphragm pump of the present invention, at the beginning, the valve 7 is opened to allow the air inside the pump chamber 1 to escape from the air discharge port / sub-discharge port 8 and the inside of the pump chamber 1 to be slurried. Then, the valve 7 is closed. After that, the slurry sucked from the suction port 3 of the suction valve 2 is hardly stored inside the pump chamber 1 and is discharged from the discharge port 5 via the discharge valve 4 with the spring s.

Although not shown, a new valve is provided at the discharge port 5 to open the valve, and the valve 7 is closed to serve as the sub-discharge valve 6 and the main discharge valve. It can also be used for ejection.

[0014]

[Effect of device]

 The diaphragm pump of the present invention has the following effects. Since the precipitate as shown in FIG. 3 did not occur at the bottom of the pump chamber, the diaphragm was not subjected to uneven stress, and the life of the diaphragm membrane was significantly extended. Even when a highly sedimentable slurry was handled in the low flow rate region, it settled and did not settle inside the pump chamber, and it became possible to discharge the slurry with a uniform concentration from the start to the end of operation. When sucking and discharging the slurry, a certain amount of solid content had to be sucked in, and conventionally, it was necessary to reduce the concentration of the slurry and increase the flow rate, but in the present invention, the operation was performed at a high concentration. It became possible to operate with a small flow rate.

[Brief description of drawings]

FIG. 1 is a sectional view showing a structure of a diaphragm pump according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a structure of a diaphragm pump according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a structure of a conventional diaphragm pump.

[Explanation of symbols]

 1 Pump Chamber 2 Suction Valve 3 Suction Port 4 Discharge Valve 5 Discharge Port 6 Sub-Discharge Valve 7 Valve 8 Air Vent and Sub-Discharge Port 9 Diaphragm 10 Shaft 11 Pump Chamber Main Body s Spring t Precipitate

Claims (1)

[Scope of utility model registration request] 1. A diaphragm pump having a structure in which liquid is sucked into a pump chamber from a suction port of a suction valve by reciprocating motion of a diaphragm, and a discharge valve is opened to discharge the liquid from the discharge port. The valve 2 is provided substantially vertically at a position lower than the bottom of the pump chamber 1, and the discharge valve 4 communicating with the inlet side of the suction valve 2 is at substantially the same position as or below the bottom of the pump chamber 1. A diaphragm pump characterized in that a sub discharge valve 6 and a valve 7 which are provided substantially horizontally at a position and communicate with the upper part of the pump chamber 1 are provided.