CN215927729U

CN215927729U - Two-way diaphragm pump without distributing valve

Info

Publication number: CN215927729U
Application number: CN202121596809.7U
Authority: CN
Inventors: 廖义德; 周翔; 魏柏杨; 高立志; 陈祥
Original assignee: Hubei Tsung Technology Co ltd
Current assignee: Hubei Tsung Technology Co ltd
Priority date: 2021-07-14
Filing date: 2021-07-14
Publication date: 2022-03-01
Anticipated expiration: 2031-07-14

Abstract

The utility model discloses a two-way diaphragm pump without a distributing valve, which comprises a shell and a motor which are installed together, wherein the outer wall of the shell is provided with two flow passages, the inner part of the shell is provided with an eccentric shaft driven by the motor and a diaphragm made of flexible wear-resistant materials, the eccentric section of the eccentric shaft is sleeved with an extrusion bearing, two ends of the diaphragm are axially positioned and sealed with the shell, one radial side of the diaphragm is provided with an anti-skid protrusion connected with the shell, the other radial side of the diaphragm is provided with a ring sleeve sleeved on the extrusion bearing, the two flow passages respectively extend to two sides of the anti-skid protrusion on the inner wall of the shell and are isolated by the ring sleeve and are not communicated all the time, the ring sleeve is contacted with the inner wall of a pump body on one eccentric side, the other side of the ring sleeve is contacted with the inner wall of the pump body continuously along the eccentric motion direction by the extrusion bearing when the motor drives the eccentric shaft. The utility model adopts a brand new diaphragm structure, does not need to be provided with a one-way distributing valve, can pump in two directions, does not need a crank connecting rod mechanism, improves the reliability and stability and has good application effect.

Description

Two-way diaphragm pump without distributing valve

Technical Field

The utility model relates to a diaphragm pump, in particular to a bidirectional diaphragm pump without a distributing valve.

Background

The principle of the diaphragm pump is that the elastic characteristics of the diaphragm are utilized to enable the diaphragm to move back and forth, and the volume cavities on two sides are driven to generate air pressure change alternately, so that liquid is continuously sucked and discharged. Due to the limitation of the existing structure, in order to ensure the continuous suction and discharge of liquid, the existing diaphragm pump needs to be matched with a flow distribution mechanism such as a one-way valve, so that the diaphragm pump cannot run in the reverse direction, and the defect can cause a series of problems in specific application, such as:

in the SCR tail gas after-treatment system of the diesel engine, urea is generally added by adopting a motor diaphragm pump or a gear pump, when the diesel engine is shut down according to the national VI standard, residual urea liquid in a pipeline and a metering electromagnetic valve (nozzle) cannot be sprayed into an exhaust pipe, therefore, a urea pump supply unit must have a back pumping or back flushing function, but for the diaphragm pump, the structure has good sealing performance, does not leak products, can only realize unidirectional operation to output liquid and cannot reversely operate, therefore, the urea pump supply unit must be provided with a back pumping electromagnetic valve and a back pumping loop, the cost of the system is increased, the urea liquid flow channel is forced to be more complicated, urea is easy to crystallize and block in the flow channel, and meanwhile, a special anti-crystallization and anti-seize urea liquid electromagnetic valve is required to be developed, so that the difficulty of development work is increased; for the gear pump, the structure can realize the forward and reverse rotation movement to realize the output and reverse pumping of liquid, but the sealing performance is poor, and the leakage is easy to generate.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a two-way diaphragm pump without a distributing valve, which adopts a brand new diaphragm structure, does not need to be provided with a one-way distributing valve, can pump in two directions, does not need a crank connecting rod mechanism, improves the reliability and stability and has good application effect.

The technical scheme adopted by the utility model is as follows:

the two-way diaphragm pump without distributing valve includes casing and motor installed together, two flow channels set on the outer wall of the casing, eccentric shaft driven by the motor and diaphragm of flexible wear-resisting material inside the casing, extruding bearing around the eccentric section of the eccentric shaft, axial locating and sealing between the two ends of the diaphragm and the casing, anti-skid lugs connected to the casing on one radial side of the diaphragm and ring sleeve on the extruding bearing on the other radial side of the diaphragm, two flow channels extending to the two sides of the anti-skid lugs in the inner wall of the casing and separated by the ring sleeve and communicated with the flow channels, and one eccentric side of the ring sleeve contacting the inner wall of the pump body to form one working cavity with the inner wall of the pump body.

Furthermore, the shell comprises a pump base and end covers which are hermetically arranged at two ends of the pump base, two ends of the diaphragm are axially positioned by the end covers, the anti-skid protrusions are connected with the end covers at the two ends through cylindrical pins, the middle part of the eccentric shaft is an eccentric section, the two ends of the eccentric shaft are not eccentric and are sleeved with supporting bearings, the supporting bearings are sleeved with transition rings, one ends of the transition rings are sleeved by ring sleeves, and the other ends of the transition rings are hermetically arranged on the inner circles of the end covers.

Furthermore, the inward end of the transition ring is provided with a flange, the inner sides of the two ends of the ring sleeve are provided with press rings, and the press rings at the two ends of the ring sleeve are respectively pressed on the end covers by the flanges on the transition rings at the two ends.

Furthermore, the pump base, the end cover and the motor shell are integrally installed through bolts and nuts, the tail portions of the bolts are pressed on the end cover at one end, the head portions of the bolts penetrate through the end cover at one end, the pump base, the end cover at the other end and the motor shell, and the nuts are pressed on the motor shell through elastic washers.

Further, the bolt is made of a hexagonal bolt made of a stainless steel material, the nut is made of a hexagonal nut made of a stainless steel material, and the elastic washer is a saddle-shaped elastic washer.

Further, the end cover, the pump seat and the transition ring are sealed through O-shaped sealing rings.

Further, the extrusion bearing and the support bearing both adopt deep groove ball bearings.

Further, the pump seat, the end cover and the transition ring are made of aluminum alloy materials, and the eccentric shaft and the cylindrical pin are made of stainless steel materials.

Further, the diaphragm is made of elastic rubber materials.

Further, the motor is a stepping motor.

The utility model has the beneficial effects that:

when the pumping device works, the motor drives the eccentric shaft to drive the extrusion bearing to eccentrically move, the extrusion bearing continuously contacts the inner wall of the pump body along the extrusion ring sleeve in the eccentric movement direction, so that the working cavity is continuously transferred between the two flow channels, pumping is finished, the anti-slip bulge avoids sliding deviation of the diaphragm in the pumping process, the two ends of the diaphragm are axially positioned and sealed with the shell, and a medium can be prevented from leaking from the end part; the diaphragm pump adopts a brand new diaphragm structure, does not need to be provided with a one-way distributing valve, can pump in two directions, adopts direct drive of the motor, does not need a crank connecting rod mechanism, and improves the reliability and the stability; the diaphragm pump not only has the sealing superiority of the traditional diaphragm pump, but also can realize positive and negative rotation output and reverse pumping, and when the diaphragm pump is used in a diesel engine SCR tail gas aftertreatment system, the diaphragm pump not only can save the original flow distribution mechanisms such as a one-way valve, but also can greatly simplify the urea supply system combining the existing one-way diaphragm pump and a reversing valve, and has good application effect.

Drawings

Fig. 1 is a schematic longitudinal sectional view of a bidirectional diaphragm pump without a distributing valve according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view (with the eccentric direction upward) of a bidirectional diaphragm pump without a distributing valve according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view (with the eccentricity down) of a two-way diaphragm pump without a distributing valve according to an embodiment of the present invention.

In the figure: 1-end cap; 2-a pump base; 3-a separator; 31-anti-slip protrusions; 32-ring sleeve; 4-an eccentric shaft; 5-a transition ring; 6-flat bond; 7-cylindrical pins; 8, a motor; 9-bolt; 10-a nut; 11-a resilient washer; 12-a support bearing; 13-extruding the bearing; 14-O-ring seal; 15-flow channel.

Detailed Description

The utility model is further described below with reference to the figures and examples.

As shown in fig. 1 to 3, a two-way diaphragm pump without a distribution valve comprises a casing and a motor 8 which are installed together, wherein two flow passages 15 are formed in the outer wall of the casing, an eccentric shaft 4 driven by the motor 8 and a diaphragm 3 made of a flexible wear-resistant material are arranged in the casing, an extrusion bearing 13 is sleeved on an eccentric section of the eccentric shaft 4, two ends of the diaphragm 3 are axially positioned and sealed with the casing, an anti-skid protrusion 31 connected with the casing is arranged on one radial side of the diaphragm 3, a ring sleeve 32 sleeved on the extrusion bearing 13 is arranged on the other radial side of the diaphragm 3, the two flow passages 15 respectively extend to two sides of the anti-skid protrusion 31 on the inner wall of the casing and are isolated by the ring sleeve 32 and are not communicated all the time, the ring sleeve 32 is in contact with the inner wall of the pump body on the eccentric side, a working cavity is formed by the inner wall of the pump body on the other side of the ring sleeve 32, and the extrusion bearing 13 is in continuous contact with the inner wall of the pump body along the eccentric motion direction when the motor 8 drives the eccentric shaft 4. When in work: the motor 8 drives the eccentric shaft 4 to drive the extrusion bearing 13 to do eccentric motion, the extrusion bearing 13 continuously contacts with the inner wall of the pump body along the extrusion ring sleeve 32 in the eccentric motion direction, continuous transfer of the working cavity between the two flow channels 15 is achieved, suction is completed, in the suction process, the anti-skidding protrusions 31 avoid sliding deviation of the diaphragm 3, the two ends of the diaphragm 3 are axially positioned and sealed with the shell, and leakage of media from the end parts can be avoided.

The contact angle between the eccentric side of the ring sleeve 32 and the inner wall of the pump body and the opening distance angle between the two flow channels 15 on the inner wall need to be comprehensively considered to ensure the proper range of the working chamber, the mutual isolation of the flow channels 15, the kinetic energy loss of the medium entering and exiting the flow channels 15 and other factors, and the contact angle between the eccentric side of the ring sleeve 32 and the inner wall of the pump body is 66 degrees, and the opening distance angle between the two flow channels 15 on the inner wall is 61 degrees in the embodiment shown in fig. 2 and 3.

As shown in fig. 1, in this embodiment, the casing includes a pump base 2 and end caps 1 hermetically installed at two ends of the pump base 2, two ends of the diaphragm 3 are axially positioned by the end caps 1, the anti-slip protrusions 31 are connected with the end caps 1 at two ends through cylindrical pins 7, the middle portion of the eccentric shaft 4 is an eccentric section, two ends of the eccentric shaft are not eccentric and are sleeved with a support bearing 12, the support bearing 12 is sleeved with a transition ring 5, one end of the transition ring 5 is sleeved by a ring sleeve 32, and the other end of the transition ring 5 is hermetically installed on an inner circle of the end caps 1. The casing adopts split type pump mount 2 and end cover 1, easy to assemble, location and sealed, and transition ring 5 can play the effect of supporting the installation for eccentric shaft 4, can also be with 1 internal circle seal of end cover, guarantees the leakproofness at 3 both ends of diaphragm.

As shown in fig. 1, in this embodiment, a flange is provided at one inward end of the transition ring 5, compression rings are provided at inner sides of two ends of the ring sleeve 32, and the flanges on the transition rings 5 at the two ends respectively compress the compression rings at the two ends of the ring sleeve 32 on the end cover 1. The arrangement of the flange and the press ring can ensure the axial position degree of the diaphragm 3.

As shown in fig. 1, in this embodiment, the pump base 2, the end cover 1 and the motor 8 casing are integrally mounted by bolts 9 and nuts 10, the tail of the bolt 9 presses on the end cover 1 at one end, the head of the bolt passes through the end cover 1 at one end, the pump base 2, the end cover 1 at the other end and the motor 8 casing, and the nut 10 presses on the motor 8 casing by an elastic washer 11. The bolt 9 is preferably a hexagonal head bolt of stainless steel material, the nut 10 is preferably a hexagonal nut of stainless steel material, and the elastic washer 11 is preferably a saddle-type elastic washer.

In this embodiment, as shown in fig. 1, the end cap 1 is sealed with the pump base 2 and the transition ring 5 by O-rings 14.

As shown in fig. 1, in the present embodiment, deep groove ball bearings are used for both the pressing bearing 13 and the support bearing 12.

In the embodiment, the pump base 2, the end cover 1 and the transition ring 5 are preferably made of aluminum alloy materials, the eccentric shaft 4 and the cylindrical pin 7 are preferably made of stainless steel materials, the diaphragm 3 is preferably made of elastic rubber materials, the motor 8 is preferably a stepping motor, and the motor 8 is connected with the eccentric shaft 4 through the flat key 6.

The diaphragm pump adopts a brand-new diaphragm 3 structure, a one-way distributing valve is not required to be arranged, so that bidirectional suction can be realized, the motor 8 is adopted for direct drive, a crank-link mechanism is not required, and the reliability and the stability are improved; the diaphragm pump not only has the sealing superiority of the traditional diaphragm pump, but also can realize positive and negative rotation output and reverse pumping, and when the diaphragm pump is used in a diesel engine SCR tail gas aftertreatment system, the diaphragm pump not only can save the original flow distribution mechanisms such as a one-way valve, but also can greatly simplify the urea supply system combining the existing one-way diaphragm pump and a reversing valve, and has good application effect.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the utility model as defined in the appended claims.

Claims

1. The utility model provides a two-way diaphragm pump of no distribution valve which characterized in that: the anti-slip eccentric pump comprises a shell and a motor which are installed together, two flow channels are formed in the outer wall of the shell, an eccentric shaft driven by the motor and a diaphragm made of flexible wear-resistant materials are arranged inside the shell, an extrusion bearing is sleeved on an eccentric section of the eccentric shaft, two ends of the diaphragm are axially positioned and sealed with the shell, anti-slip protrusions connected with the shell are arranged on one radial side of the diaphragm, a ring sleeve sleeved on the extrusion bearing is arranged on the other side of the diaphragm, the two flow channels respectively extend to two sides of the anti-slip protrusions on the inner wall of the shell and are isolated by the ring sleeve and are not communicated all the time, the ring sleeve is in contact with the inner wall of a pump body on one eccentric side, a working cavity is formed between the other side of the ring sleeve and the inner wall of the pump body, and the extrusion bearing is in continuous contact with the inner wall of the pump body along the eccentric motion direction when the eccentric shaft is driven by the motor.

2. The two-way diaphragm pump without distribution valve of claim 1, wherein: the casing includes pump base and sealed end cover of installing in pump base both ends, and the diaphragm both ends are by end cover axial positioning, and the antiskid is protruding to be connected with the end cover at both ends through the cylindric lock, and the middle part of eccentric shaft is eccentric section, both ends do not have the eccentricity and overlap and have a supporting bearing, and the last cover of supporting bearing has the transition ring, and one end of transition ring is sheathe in by the ring cover, and the sealed installation of the other end is on the end cover inner circle.

3. The two-way diaphragm pump without distribution valve of claim 2, wherein: the inward end of the transition ring is provided with a flange, the inner sides of the two ends of the ring sleeve are provided with press rings, and the press rings at the two ends of the ring sleeve are respectively pressed on the end covers by the flanges on the transition rings at the two ends.

4. The two-way diaphragm pump without distribution valve of claim 2, wherein: the pump base, the end cover and the motor shell are integrally installed through bolts and nuts, the tail portions of the bolts are pressed on the end cover at one end, the head portions of the bolts penetrate through the end cover at one end, the pump base, the end cover at the other end and the motor shell, and the nuts are pressed on the motor shell through elastic washers.

5. The two-way diaphragm pump without distribution valve of claim 4, wherein: the bolt is a hexagon head bolt made of stainless steel materials, the nut is a hexagon nut made of stainless steel materials, and the elastic washer is a saddle-shaped elastic washer.

6. The two-way diaphragm pump without distribution valve of claim 2, wherein: the end cover, the pump seat and the transition ring are sealed through O-shaped sealing rings.

7. The two-way diaphragm pump without distribution valve of claim 2, wherein: the extrusion bearing and the supporting bearing both adopt deep groove ball bearings.

8. The two-way diaphragm pump without distribution valve of claim 2, wherein: the pump base, the end cover and the transition ring are made of aluminum alloy materials, and the eccentric shaft and the cylindrical pin are made of stainless steel materials.

9. The two-way diaphragm pump without distributing valve according to any of claims 1 to 8, wherein: the diaphragm is made of elastic rubber material.

10. The two-way diaphragm pump without distributing valve according to any of claims 1 to 8, wherein: the motor adopts a stepping motor.