CN2661963Y

CN2661963Y - Pneumatic diaphragm pump

Info

Publication number: CN2661963Y
Application number: CN 200320120670
Authority: CN
Inventors: 谢云海; 李向英; 王中全
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-12-10
Filing date: 2003-12-10
Publication date: 2004-12-08
Anticipated expiration: 2013-12-10

Abstract

The utility model relates to a pneumatic diaphragm pump, which comprises a pump body, an air intake device, two bilaterally symmetric membrane chambers, a ventilation device, an intake vent, an outlet vent and the check valve between the intake and the outlet vents; wherein, the left membrane chamber and the right membrane are connected through the coupling shaft; the air intake device is formed by a piston mechanism. The utility model is characterized mainly in that: an a-static spring is arranged on one side of the piston to ensure the in-place motion reliability during working process and prevent the phenomenon of stopping in the middle and cease working. At the same time, the ventilation device is formed by the ventilation switches arranged in the left and right membrane chambers. The piston is alternatively communicated with the power supplies of the left and the right membrane chambers, thus no gas source leakage occurs during the working process. The utility model has the advantages of functional reliability, high efficiency, low noises and long service life.

Description

Membrane pump with pneumatic drive

Technical field

The utility model relates to a kind of pump, specifically about a kind of membrane pump with pneumatic drive.

Background technique

Membrane pump with pneumatic drive generally is made up of the safety check between air inlet system, symmetrical chamber of septum, air interchanger, import and export and the import and export passage.The coaxial connection of its left and right sides chamber of septum, air inlet system is made up of piston mechanism, by piston bleed pressure is incorporated into one of them chamber of septum, makes this chamber of septum supercharging, the diaphragm drive shaft coupling of this chamber of septum and opposite side diaphragm are simultaneously to a lateral movement, when shaft coupling moves to certain position, on its axle sleeve another is communicated with air-vent, piston is moved to opposite side, bleed pressure is incorporated into another chamber of septum, motion is and so forth delivered to outlet side with the suction of suction side medium.The subject matter that existing membrane pump with pneumatic drive exists: the one, the position of piston in piston cylinder is to determine by the deadweight of air pressure and piston in the air inlet system, occur piston in the course of the work easily and be in the neutral position, make the air inlet simultaneously of left and right sides chamber of septum or give vent to anger simultaneously, cause the out-of-work phenomenon of pump, influence the product functional reliability, so existing membrane pump with pneumatic drive generally is provided with the power-assist release link in piston one side, and piston is put in place; The 2nd, air interchanger is cooperatively interacted by seal ring on the shaft coupling and the pore on the axle sleeve and constitutes, and seal ring to-and-fro motion in axle sleeve is worn and torn easily, leaks gas, reduce pump working efficiency, increase noise, shorten product working life.

The model utility content

One of the purpose of this utility model is the problem that exists at prior art, provide a kind of piston can automatic in-position, the membrane pump with pneumatic drive of reliable operation;

Two of the purpose of this utility model is the problems that exist at prior art, provides that a kind of high working efficiency, noise are low, the membrane pump with pneumatic drive of long product lifecycle.

The technological scheme of one of realization the utility model purpose comprises the safety check between the pump housing, air inlet system, symmetrical film chamber, air interchanger, inlet passage, outlet passage and the import and export passage, its film chamber, left and right sides is by the coaxial connection of shaft coupling, air inlet system is made up of piston mechanism, mainly is that the side at piston is provided with the spring assisting device.

Realizing two of the utility model purpose, is that air interchanger is formed by being installed in the indoor ventilation switch of left and right sides film in above technological scheme, and the both sides of this ventilation switch are communicated with the film chamber at its place and the piston cavity of piston one side respectively.

One of the utility model advantage compared with prior art is, is provided with the spring assisting device in a side of piston, and piston can be put in place by reliable movement in the course of the work, in the middle of can not being parked in and out-of-work phenomenon, and its reliable operation;

Two of the utility model advantage compared with prior art is, air interchanger is formed by being installed in the indoor ventilation switch of left and right sides film, when wherein a latallae moves to certain position, opening installation is at the indoor ventilation switch of its film, the air pressure of piston one side is bled off, make piston, bleed pressure is incorporated into another film chamber to this lateral movement, source of the gas gas leakage can not take place in the course of the work, its high working efficiency, low, the long product lifecycle of noise.

Description of drawings

Fig. 1 is a cross-sectional view of the present utility model.

Fig. 2 is the structural representation that the utility model air inlet system is connected with the middle pump housing.

Fig. 3 is the structural representation of the utility model ventilation switch.

Embodiment

Membrane pump with pneumatic drive as shown in Figure 1, comprise the safety check between the pump housing 1, air inlet system, symmetrical film chamber, air interchanger, inlet passage, outlet passage and the import and export passage, its film chamber, left and right sides is by shaft coupling 7 coaxial connections, air inlet system is made up of piston mechanism, is provided with the spring assisting device in a side of piston 28.This spring assisting device is made up of spring 23, power-assist bar 25, power-assist seat 21 and power-assist lid 22.One end of power-assist bar 25 is fixedlyed connected with piston 28 by the hole in the power-assist seat 21, and the other end is connected with spring 23 by connecting base 24.Seal by O shape circle 26 between power-assist bar 25 and the power-assist seat 21.End cap 22 is equipped with in the end of power-assist seat 21, between itself and the piston cylinder 30 by 27 sealings of O shape circle.The inlet of piston cylinder 30 is provided with suction tude joint 29, the piston cavity that external bleed pressure enters the inner cavity and the end face of piston 28 through suction tude joint 29, as shown in Figure 2.

Air interchanger is formed by being installed in the indoor ventilation switch of left and right sides film, and this ventilation switch is made up of position-limited lever 20, setting sleeve 19 and spring, as shown in Figure 3.On the pump housing 16, position-limited lever 20 cooperated with setting sleeve 19 movable sealings in the middle of setting sleeve 19 was fixed on, and the one end is indoor at film, and the other end is communicated with the piston cavity of piston 28 end faces by the through hole of the middle pump housing 16.Position-limited lever 20 axially is shaped on some vent slots at the circumference that is positioned at film chamber part.

In Fig. 1, symmetrical film chamber is by constituting between diaphragm 6 and the middle pump housing 16 both ends of the surface.Press-fit by press mold row 15 around the diaphragm 6, about two diaphragms be connected simultaneously shaft coupling 7 two ends, diaphragm 6 is installed on the shaft coupling 7 by screw 8 by inner clip plate 5, outer plate 19.Between the shaft coupling 7 and the middle pump housing 16, axle sleeve 9 is housed, movable between the two the cooperation, and by seal with O ring, the indoor position limit cycle 18 that is equipped with respectively of the left and right sides film of shaft coupling 7.Inlet passage 10 is communicated with by left and right sides passage 4,11 with outlet passage 12, and upper and lower safety check is set in passage, and upper and lower safety check is made up of spheroid 14,3 and valve seat 13,2 respectively.Exhaust port outlet port at the middle pump housing 16 is provided with silencing apparatus 17.

In Fig. 2, the middle pump housing 16 is shaped on 33,34, two inlet holes 31,32 of 31,32 and two exhaust ports of two inlet holes and is communicated with film chamber, the left and right sides respectively, by the to-and-fro motion of piston 28, two inlet holes 31,32 are communicated with exhaust port 33,34 in turn, make film chamber, the left and right sides alternately inflation and exhaust.

Claims

1, a kind of membrane pump with pneumatic drive, comprise the safety check between the pump housing, air inlet system, symmetrical film chamber, air interchanger, inlet passage, outlet passage and the import and export passage, film chamber, the left and right sides is by the coaxial connection of shaft coupling, air inlet system is made up of piston mechanism, it is characterized in that being provided with the spring assisting device in a side of piston (28).

2, membrane pump with pneumatic drive according to claim 1 is characterized in that air interchanger forms by being installed in the indoor ventilation switch of left and right sides film, and the both sides of this ventilation switch are communicated with the film chamber at its place and the piston cavity of piston (28) one sides respectively.

3, membrane pump with pneumatic drive according to claim 1 and 2, it is characterized in that the spring assisting device is made up of spring (23), power-assist bar (25), power-assist seat (21), one end of power-assist bar (25) is fixedlyed connected with piston (28) by the hole in the power-assist seat (21), and the other end is by being connected with spring (23).

4, membrane pump with pneumatic drive according to claim 2, the switch that it is characterized in that taking a breath is made up of position-limited lever (20), setting sleeve (19) and spring, setting sleeve (19) is fixed on the middle pump housing (16), position-limited lever (20) cooperates with setting sleeve (19) movable sealing, the one end is indoor at film, the other end is communicated with the piston cavity of piston (28) end face by the through hole of the middle pump housing (16), and position-limited lever (20) axially is shaped on some vent slots at the circumference that is positioned at the film indoor section.

5, membrane pump with pneumatic drive according to claim 3, the switch that it is characterized in that taking a breath is made up of position-limited lever (20), setting sleeve (19) and spring, setting sleeve (19) is fixed on the middle pump housing (16), position-limited lever (20) cooperates with setting sleeve (19) movable sealing, the one end is indoor at film, the other end is communicated with the piston cavity of piston (28) end face by the through hole of the middle pump housing (16), and position-limited lever (20) axially is shaped on some vent slots at the circumference that is positioned at the film indoor section.