WO2009015528A1

WO2009015528A1 - A membrane pump

Info

Publication number: WO2009015528A1
Application number: PCT/CN2007/003628
Authority: WO
Inventors: Leijie Jiang; Hongbo Liu
Original assignee: Fulling & Ceiec Co., Ltd.
Priority date: 2007-07-30
Filing date: 2007-12-17
Publication date: 2009-02-05
Also published as: CN101100989A; CN101100989B

Abstract

A membrane pump includes a casing (1), a membrane pump assembly and an eccentric wheel (3) driven by an electric motor (2). Said membrane pump assembly is comprised of a gas outlet cover (4-5), a rotary support (4-2), a center connecting rod (4-1) of the rotary support, at least two driving portions (4-3) fixed on the rotary support (4-2) and membrane portions (4-4) connected with the driving portions (4-3). A variable capacity pump chamber (6) is formed within each membrane portion (4-4). The gas outlet cover (4-5) is provided with a gas outlet port (5). The center connecting rod (4-1) of the rotary support is connected with the eccentric wheel (3). Said membrane portion (4-4) is a cylinder ballonet with one open end and encloses on a corresponding boss (4-7), the interface between them is formed with a ring-shape gas outlet valve (7). The rotary support (4-2) and the driving portions (4-3) are provided with through gas inlet holes (8), and a bottom of the membrane portion (4-4) keeps close to a top surface of each driving portion (4-3) and is provide with a semi-circle gas inlet valve (9) communicating with one of said gas inlet holes (8).

Description

Diaphragm pump

Technical field

The invention relates to the field of gas varactors, in particular to a diaphragm pump.

Background technique

The conventional diaphragm pump has a structure as shown in Fig. 1. In the figure, 21 is a motor, 22 is an output shaft of the motor 21, 23 is an eccentric fixed to the output shaft 22, and 24 is obliquely fixed to the eccentric The g-axis, 26 is a drive body that can be rotatably mounted with respect to the drive shaft 24, 27 is a casing, 28 is a cylinder portion, and 29 is a valve cover. 31 is the diaphragm part, 32 ! A cylindrical discharge valve, the diaphragm portion 31 and the discharge valve 32 are integrally formed to constitute a diaphragm main body 3'. The diaphragm body 30 is fixed by the cylinder portion 28 and the wide door cover 29. Further, 33, 34 are valve chambers (common chambers) and discharge ports integral with the valve cover 29, 35 is a suction valve, and 35 is a suction port.

The diaphragm pump having such a structure causes the eccentric 23 to rotate by depending on the rotation of the output shaft 22 driven by the motor 21. By the rotation of the eccentric 23, the drive shaft 24 fixed to the eccentric wheel changes its inclination direction. Therefore, the inclination direction of the driving body 26 also changes, and the driving portion (piston) 31a of the diaphragm portion 31 attached to the driving body 26 re-acts to function as a pump. That is, when the driving portion 31a of the diaphragm portion on the right side of the drawing rises, the volume of the pump chamber is reduced and the pressure is increased, and the cylindrical discharge valve 32 is opened, and the fluid is sent out from the discharge port 34. On the other hand, the left side When the driving portion of the partition is lowered, the volume of the pump chamber is increased, and the suction head 35 of the umbrella head is opened, and the external fluid flows in.

Thus, the fluid flows into the pump chamber from the outside through the suction valve by the volume change of the pump chamber, and then the inflowing fluid opens and discharges the valve from the discharge port to function as a pump.

In the above diaphragm pump, the intake and outlet of the pump chamber are both disposed on the upper side of the pump chamber, and the air flow structure is sucked up from the top, and the airflow enters the airbag through the intake valve, and then is removed through the air outlet valve on the same side, because the airbag The space is small, the airflow enters and exits quickly and is not stable, and the noise is large; the umbrella-shaped intake valve has a complicated structure, is difficult to manufacture, is difficult to assemble, and has high cost; the connecting rod is rigidly fixed to the eccentric wheel, and the motor directly bears a large load and consumes a large current.

Summary of the invention

In order to overcome the deficiencies of the above diaphragm pump, the present invention optimizes the inlet and outlet structures of the pump body, and provides an electric diaphragm pump which can reduce energy consumption and work noise.

The diaphragm pump of the present invention comprises a casing, a diaphragm pump assembly and a motor-driven eccentric wheel, said partition The membrane pump assembly is composed of an air outlet cover, a rotating frame, a rotating frame center link, at least two driving portions fixed on the rotating frame, and a diaphragm portion connected to the driving portion, and a variable displacement pump chamber is formed in the diaphragm portion, and the air outlet cover is provided. There is an air outlet, the center link of the rotating frame is connected with the eccentric wheel, and the diaphragm portion is a cylindrical air bag with an open end, and is wrapped by the open mouth on the corresponding boss, and the wrap of the two forms a ring-shaped air outlet. The valve, the rotating frame and the driving portion are provided with a through air inlet hole, and the bottom of the diaphragm portion is attached to the upper surface of the driving bush and is provided with a semicircular intake valve that can communicate with the air inlet hole.

The above-mentioned boss, the diaphragm portion and the driving portion constitute an air intake and exhaust function unit, and at least two, preferably four, of the suction and exhaust h functional units are symmetrically distributed on the circumferential surface of the rotating frame; the air is exhausted from the casing In turn, the air intake hole, the semicircular intake valve, the pump chamber, the outlet valve exit the pump chamber, and finally the air outlet output from the air outlet cover, that is, the air flow enters from the semicircular intake valve at the lower end of the pump chamber, and then the air outlet from the front end The valve is removed, changing the airflow structure that the diaphragm pump normally enters and exits on the same side of the pump chamber.

Further improvement of the diaphragm pump

A damping sponge ring is arranged between the inner wall of the casing and the motor, and a partition is arranged between the motor and the diaphragm pump assembly, and an air chamber is formed between the partition and the air outlet cover of the casing, and the partition is provided with a passage Through hole of the gas chamber.

The gas enters from the mounting hole inside the motor to the air chamber which is relatively isolated from the outside, and is temporarily stored in the pump chamber of the diaphragm portion, thereby effectively reducing the operating noise. On the other hand, the motor is located inside the casing and also acts as a sound insulator. On the other hand, since the gas is input into the pump through the motor, the motor is cooled by air and heat, and the service life of the motor can be extended. The gas in the gas chamber can also cool the diaphragm to prevent the rubber material of the diaphragm. Ageing.

A further improvement of the invention resides in:

The eccentric wheel connected to the motor is provided with a lower limit eccentric pocket, the eccentric wheel has a support portion fixed on the casing directly above, and the support portion is provided with an upper limit center pit, the center of the rotating frame The upper and lower ends of the rod respectively extend into the upper limit pit and the lower limit pit. This fulcrum is connected in a way that gives the link more freedom and reduces the energy loss when the motor drives the link.

In order to simplify the processing process of the component, further: an air outlet chamber is arranged below the air outlet of the air outlet cover, and a fixed ring frame is arranged on the periphery of the boss, and the assembly of the integral structure is formed by the air outlet chamber, the boss and the fixed ring frame, Mold can be die-casted, while ensuring the stability of the structure and the accuracy of the installation position. In order to ensure the airtightness of the pump body chamber, further: a diaphragm body is disposed at a periphery of the diaphragm portion, and the diaphragm body is sandwiched between the casing and the assembly to seal the joint surface therebetween; the assembly and the air outlet cover Gaskets and seals are provided between them. It ensures that the gas will not leak or return to the outside during the whole suction to output process, so that the gas flows according to the established air flow path, ensuring the working efficiency of the pump.

In summary, the beneficial effects of the present invention are as follows:

1. A gas flow structure: from the bottom of the pump into the air chamber a large space, and then the steady flow of air out into the diaphragm portion, whereby a more stable flow can be obtained, the low noise ^ ^1. At the same time, since the gas can be cooled by the motor and the diaphragm portion, the service life of the motor is prolonged, and the aging of the diaphragm portion is delayed.

2. Intake structure: The diaphragm part replaces the complicated shape of the umbrella head-shaped intake valve with the bottom semi-circular inlet valve. The structure is simple, the cost is low, and the anti-leakage effect is good.

3. Outlet structure: Due to the difference of air pressure during air intake, the upper part of the diaphragm part tightly wraps the boss to act as a check valve. When the air is exhausted, the internal air pressure pushes the upper air outlet valve of the diaphragm part to discharge the gas. The structure can effectively prevent the air from flowing backward, and the production is simple and the gas output effect is good. '

4. Rotating mode: The connecting rod and the eccentric wheel are connected by the movable fulcrum. The motor only needs a small force to drive the connecting rod, which can reduce power loss and improve efficiency.

5. Connecting rod fixed mode: The connecting rod is fixed to the rotating frame and separated from the supporting point of the rotating frame, which can effectively reduce the high power consumption caused by the mutual pulling of the diaphragm parts and reduce the energy loss.

DRAWINGS

The invention will now be further described with reference to the drawings and embodiments.

Figure 1 is a cross-sectional view of a conventional diaphragm pump;

Figure 2 is a cross-sectional view of the diaphragm pump of the present invention;

Figure 3 is a schematic view showing the structure of a diaphragm portion of the diaphragm pump of the present invention;

Figure 4 is a side elevational view of Figure 3.

In the figure: 1. Case, 2. Motor, 3. Eccentric, 3-1. Lower limit pit, 4-1. Connecting rod, 4-2. Rotating frame, 4-3. Drive unit, 4-4 Diaphragm part, 4-5. Outlet cover, 4-7. Boss, 5. Air outlet, 6. Pump chamber, 7. Cylindrical outlet valve, 8. Air inlet, 9. Semi-circular intake valve, 10. Inlet hole, 11. Partition, 12. Air chamber, 13. Damping sponge ring, 14. Rotating frame support, 14- 1. Upper limit pit, 15. Outlet chamber, 16. Fixed ring frame , 17. Assembly, 18. Diaphragm body, 19-1. Gasket, 19-2. Sealing ring.

detailed description The diaphragm pump shown in Figure 2 is provided with a casing. ^ Motor 2, an eccentric 3 fixed to the output shaft of the motor 2; a diaphragm pump assembly is provided in the casing 1, including a rotating frame 4-2, a center connection a rod 4-1, a driving portion 4-3 provided on the rotating frame 4-2, a diaphragm portion 4-4 connected to the driving portion 4-3, and an air outlet cover 4 connected to the casing 1 and provided with an air outlet 5 5 and the bosses 4-7, the diaphragm portion 4-4 is a cylindrical airbag which is open at one end, and the open end of the airbag is elastically wrapped around the outer circumferential surface of the boss 4-7, and the inside of the diaphragm portion 4-4 is formed. The variably pumping chamber 6 forms an annular outlet valve 7 at the junction of the diaphragm portion 4-4 and the boss 4-7; the bottom of the diaphragm portion 4-4 is fitted to the upper surface of the driving portion 4-3, and the rotating frame 4 2 and the driving portion 4-3 is provided with a through air inlet hole, and a semicircular intake valve 9 is disposed on the diaphragm portion 4-4 at the outlet of the air inlet hole 8; the boss 4-7, the diaphragm portion 4 4 and the drive unit 4-3 constitute a suction and exhaust function unit. Fig. 3 shows that the bottom of the diaphragm portion 4-4 is provided with a semicircular inlet width 9, and the four diaphragm portions are symmetrically arranged. Referring to Fig. 2, inside the casing 1, the air flow sequentially passes through the air inlet 8, the semicircular intake valve 9, the pump chamber 6, the annular air outlet valve 7, and the air flow passage of the air outlet 5. A shock absorbing sponge ring 13 is interposed between the motor 2 and the inner wall of the casing 1. A partition 11 is disposed between the motor 2 and the diaphragm pump assembly, the partition 11 has an air inlet 10 leading to the air chamber 12; a partition 12 and an air outlet 4-5 form an air chamber 12; 3, the housing 1 above the JE is fixedly provided with a rotating frame support portion 14, and the surface of the rotating frame supporting portion 14 and the eccentric wheel 3 are respectively provided with an upper limit center recess 14-1 and a lower limit eccentric concave hole 3-1, the connecting rod The upper and lower ends of 4-1 are respectively inserted into the two dimples, 14-1 and 3-1. An air outlet chamber 15 is disposed below the air outlet 5, and a fixed ring frame 16 is disposed on the outer periphery of the boss 4-7, and an assembly of the integral structure is formed by the air outlet chamber 15, the boss 4-7, and the fixed ring frame 16. 17. A diaphragm main body 18 is provided at the periphery of the diaphragm portion 4-4, and the diaphragm main body 18 is interposed between the casing 1 and the assembly 17 to seal the joint surface therebetween; and is disposed between the assembly 17 and the air outlet cover 4-5. There are gasket 19-1 and sealing ring 19-2. .

The diaphragm pump of the present invention passes through the motor 2 _; drives the eccentric 3, drives the connecting rod 4-1, periodically changes the inclination direction of the connecting rod, and changes the tilting direction of the rotating frame 4-2, thereby The diaphragm portion 4-4 and the driving portion 4-3 of each unit on the revolving frame are periodically moved up and down. In this process, since the connecting rod 4-1 and the eccentric wheel 3 are non-rigidly connected, the two are separated movements, so the motor 2 only needs a small force to drive the connecting rod 4-1, which can reduce the power loss. The efficiency is improved. At the same time, the connecting rod 4-1 and the rotating frame support portion 14 are also separated movements, which can effectively reduce the high power consumption caused by the mutual pulling of the diaphragm portions 4-4 and reduce energy loss.

The volume of the pump chamber 6 changes during the vertical movement of the driving portion 4-3. When the diaphragm When the driving portion 4-3 of 4-4 rises, the volume of the pump chamber 6 decreases, the pressure in the pump chamber 6 increases, the semicircular air inlet width 9 of the air inlet 8 is closed, and the annular air outlet width 7 is pushed away by the air flow. The air enters the air outlet chamber 15 through the gap between the boss 4-7 and the airbag, and is output from the air outlet 5. At this time, the annular outlet valves of the other three diaphragm portions 4 to 4 are all closed.

On the contrary, when the driving portion 4-3 is lowered, the volume of the pump chamber 6 is increased, the pressure in the pump chamber 6 is lowered, and the opening of the air bag tightly wraps around the boss 4-7, that is, the annular air outlet valve 7 is closed, and the diaphragm portion 4-4 is closed. The bottom semi-circular intake valve 9 is opened to the pump chamber 6 side, and the air is passed through the through hole 13 of the casing 1 into the interior of the air chamber 12, and then flows through the rotating frame 4-2 and the driving portion 4-3. The air hole 8 is pushed up into the semicircular intake valve 9 into the diaphragm portion 4-4. During this process, the helium gas enters the air chamber 12 of the large space from the bottom of the pump body, and then flows into the diaphragm portion 4-4 after steady flow, and the airflow is relatively stable and the noise is low. At the same time, since the air enters the rotating part, the heat generated by the motor and the friction between the rubber airbag and the plastic can be effectively reduced, and the service life is increased.

In the above process, the inclination directions of the respective driving portions are sequentially changed continuously, and are repeated periodically, and each of the diaphragm portions 4-4 having a phase difference is sequentially operated, and the pump chamber 6 continues to flow in and out of the gas, so that the diaphragm pump is nearly realized. Continuous gas supply.

Claims

Rights request

1. Diaphragm pump, including housing (1), diaphragm pump assembly, eccentric driven by motor (2)

(3) The diaphragm pump assembly is composed of an air outlet cover (4-5), a rotating frame (4-2), a rotating frame center link (4-1), and at least two driving portions fixed to the rotating frame ( 4-3), which is composed of a diaphragm portion (4-4) connected to the driving portion (4-3), and a variable displacement pump chamber (6) is formed in the diaphragm portion (4-4), which is! The utility model is characterized in that the air outlet cover is provided with an air outlet (5), the rotating frame center connecting rod (4-1) is connected with the eccentric wheel (3), and the diaphragm portion (4-4) is a one-port cylindrical airbag. And wrapped in the corresponding bosses (4-7) through the opening, the wraps of the two form an annular air outlet valve (7), the rotating frame (4-2) i and the driving part (4-3) are provided a through hole (8), a bottom portion of the diaphragm portion (4-4) is attached to the upper surface of the driving portion (4-3) and is provided with a half that can communicate with the upper air inlet hole (8) Round intake valve (9).

The diaphragm pump according to claim 1, characterized in that a damping sponge ring (13) is arranged between the inner wall of the casing (1) and the motor (2) |:, and is arranged between the motor and the diaphragm pump assembly. There is a partition (11), and a gas chamber (6) is formed between the partition (11) and the gas outlet cover (4-5), and the partition (11) is provided with a through hole (10) leading to the gas chamber.

3. The diaphragm pump according to claim 1, wherein the rotating frame support portion (14) is fixedly disposed on the casing directly above the eccentric (3), and the upper and lower ends of the connecting rod (4-1) are respectively It is connected to the rotating frame support (14) and the eccentric.

4. The diaphragm pump according to claim 3, characterized in that said eccentric (3) is provided with a 'lower limit eccentric pocket (3-1), and one above the eccentric (3) is fixed to the machine a support portion (14) on the shell (1)', the support portion (14) is provided with an upper limit central recess (14-1), and the upper and lower ends of the rotating rack center link (4-1) are respectively extended Enter the upper limit pit (14-1) and the lower limit pit (3-1).

5. The diaphragm pump according to claim 1, wherein an outlet chamber (15) is disposed below the air outlet (4-5) of the air outlet cover (4-5), and is located at the boss (4-7). The outer periphery is provided with a fixed ring frame (16), and an integrated structure (17) is composed of an air outlet chamber (15), a boss (4-7) and a fixed ring frame (17).

6. The diaphragm pump according to claim 5, wherein a diaphragm main body 18 is disposed at a periphery of the diaphragm portion (4-4), and the diaphragm main body is interposed between the casing (1) and the assembly (17). A gasket (19-1) and a seal ring (19-2) are provided between the assembly (17) and the air outlet cover (4-5).