CN104379932A - Diaphragm pump and valve assembly - Google Patents

Abstract

A diaphragm pump having an improved wobble plate and cam/bearing assembly for increased pump life and improved inlet and outlet valve design for increased effective sealing area. A cam/bearing assembly includes a cam injection molded directly into an inner race of a bearing to prevent the cam from pulling away from the bearing. The wobble plate is injection molded directly onto an outer race of the bearing to prevent the wobble plate from pulling away from the cam and bearing. Inlet and outlet check valves include rounded peripheral relief zones that form a band, as opposed to a line, of effective sealing area when in the sealed position within a valve seat that eliminate or reduce sealing inconsistencies and increase sealing efficiencies.

Description

There is the pump life-span of improvement and the diaphragm pump of efficiency

Technical field

The present invention relates generally to diaphragm pump, and relate more particularly to the valve assembly of the cam/bearing unit of the improvement for diaphragm pump, the wobble plate/bearing unit of improvement and improvement.

Background technique

Reciprocating pump is for using one or more oscillating piston, plunger or film (barrier film) to make fluid move and be those pumps in a required direction by the movement limit of fluid by safety check.One type of reciprocating pump is diaphragm pump.Diaphragm pump for using barrier film, as diaphragm of rubber, for driving the wobble plate of a series of pistons formed in barrier film, a series of room of being formed on the valve chest of the piston structure for accommodating barrier film and be attached to valve chest for fluid the most at last from entrance pump to the positive-displacement pump of the combination of the reciprocating action of the suitable non-return safety check of outlet.

Diaphragm pump is generally used for the fluid of relatively small amount, as water moves to another position from a position.Such as, diaphragm pump can be used for the recreation vehicle etc. moving to water or shift out property.For business application, the typical flow of diaphragm pump is up to 10 gallons (GPM) per minute, but the diaphragm pump with higher negotiability also can be used for commercial Application.

Normally by comprising, the motor of live axle, pneumatic motor or electric motor drive diaphragm pump.Put into cam between live axle and wobble plate and ball bearing assembly by the in rotary moving push-and-pull campaign that convert a series of piston of wobble plate by live axle.Wobble plate is mechanically linked to barrier film.The nutating action of barrier film and wobble plate plays a role to activate in each room in a series of rooms that each piston makes it in succession enter to limit on valve plate to be pushed into by fluid and to pull out each room.

Diaphragm pump is normally single-acting, and fluid is pulled to from inlet a room of valve plate by it on a direction of piston movement, and is disposed to room of outlet from this room by fluid on another direction of piston movement.More specifically, when the volume of the room of valve plate increases (when shifting out from this room when piston or remove from this room), pressure in the chamber reduces and fluid is drawn to this room from the inlet that the entrance of pump is fluidly communicated with.When the pressure of this room increases because volume reduces subsequently (piston moves in this room or rushes this room and moves down), the fluid be before inhaled in this room is forced to and flows out this room and enter in the room of outlet be fluidly communicated with delivery side of pump.

Finally, to move up and fluid sucks in this room by barrier film again that shift out this room, complete and once circulate.

Such as, describe the example of diaphragm pump in U.S. Patent number 5791882,6048183,6623245 and 6840745, the mode that all these patents are quoted all is in full incorporated to herein.

As discussed above, wobble plate is attached to the live axle of the rotation of motor operably through cam/bearing unit.More particularly, cam is attached to the live axle be positioned on the internal surface of cam, thus makes cam not rotate relative to axle but rotate together with the axis.Cam also comprises outer ring surface, its be attached to ball bearing inner ring thus make cam not relative to ball bearing inner ring and rotate.Wobble plate is attached to the outer ring of ball bearing, thus makes wobble plate around cam/bearing unit, and wobble plate not relative to ball bearing outer ring and rotate.

In the operation period of pump, particularly during continuous start, produce heat because of the internal friction in bearing and the radiation heat being derived from motor.Have different expansivitys owing to forming the material of each in cam, bearing and wobble plate, therefore produced heat can make the connection between cam and bearing and between wobble plate and bearing fluff.When connection fluffs, mobile performance is impaired, thus can reduce flow by exceed its ability 50%.Create after connection fluffs because of the more heats caused that rub, its acceleration performance declines and finally causes bearing to break down.

Cause due to the offset orientation of the cam on the live axle of motor at another common schema of cam and bearing or the connection fault between bearing and wobble plate.Then, too much load is placed in and wobble plate can be made to occur the wobble plate of displacement from bearing and/or cam by nutating action.Due to the offset resistance of wobble plate, harmonic generation that is that cause also can make bearing fluff.With content is similar above, when connection fluffs, mobile performance is impaired, thus can reduce flow by exceed its ability 50%.

A kind of technology of the endurance and reference Fig. 1 for extending cam/bearing connection 1 is that the cam 10 made by cast zinc alloy is pressure bonded in the inner ring 14 of bearing 12, thus forms interference fit.Cam 10, by putting to realize better endurance in place by being engaged by stake formula in pit 16 punching press to the face 18 of cam 10, as shown in Figure 1, thus makes cam 10 be out of shape to help to hold it in bearing 12.Although cam 10 formulas are engaged to the endurance having improved connection in bearing 12, but still can see fault after long-term continuous duty starts.

Connect 20 about wobble plate as shown in Figure 2/bearing, between erecting stage, the wobble plate 22 be made up of cast aluminium alloy is heated to 140 degrees Celsius and bearing 12 is depressed in wobble plate 22.Because wobble plate 22 is machined as tight tolerance, after wobble plate 22 cools and shrinks, between the outer ring 28 and wobble plate 22 of bearing 12, there is interference fit closely.Then, wobble plate 22 is bonded on 24 further bearing 12 is fixed to wobble plate 22 by stake formula, as shown in Figure 2.Further, multiple retaining screw 26 is installed to make the outer ring 28 of bearing 12 can not at the internal rotating of wobble plate 22.Even after the continuous start of 1000+ hour, even this technology greatly reduces the loose coupled condition completely eliminated between wobble plate and bearing.But, between erecting stage, this technology not only costliness but also consuming time.

About safety check and valve chest assembly, what usually find in diaphragm pump is positioned on valve chest and is had the problem of inconsistent sealing by the entrance and exit valve that valve chest is loaded with, thus create a further reduction the operating efficiency of pump.

With reference to Fig. 3 A-4B, the inlet valve 30 of prior art comprises central mounting portion 32, as pillar, and around the elastic packing forming section 34 of pillar 32 one end 36.Central mounting portion 32 plays a role to fix inlet valve 30 in the valve seat 38 of the room at valve chest.Elastic part 34 comprises core 40 and release district, periphery 42 or lip.Release district, periphery 42 plays a role to form sealing during slight curvature in the valve seat 38 of valve chest, thus seals and the connection of the fluid of restricted passage inlet opening.

With reference to Fig. 4 A-4C, the valve of the prior art of drawing is installed in the valve seat of the room of valve chest.With reference to Fig. 4 A, first side 44 in shown release district, periphery 42 is on the position of loosening, namely, state residing for being assembled in valve before in valve seat and being natural, the second shown side 46 is then on the sealing station of slight curvature, and namely at this moment the piston of barrier film is just moving in the room being provided with inlet valve with restriction or the flowing of completely anti-fluid.As shown in FIG. 4 C, first side 44 in shown release district, periphery 42 is on the position of loosening again, namely in the state being assembled in valve nature place before in valve seat, the second shown side 47 is then on bending or open position, thus makes release district, periphery 42 bending or carried away this seat and flow to allow fluid significantly.As shown in Figure 4 A, the cross section in periphery release district comprises step part or by the mathematics profile represented by discrete or discontinuous function.But, " step " design should provide minimum bendingly to alleviate, this is because it only seals along the edge of lip 42, thus the effective sealing region 48 of valve 30 is restricted to fine rule (as on side 46 see), create sealing inconsistency.

With reference to Fig. 5 A-6B, the outlet valve 50 of prior art comprises central mounting portion 52, as pillar, and around the elastic packing forming section 54 of pillar 52 one end.Central mounting portion 52 plays a role with stationary exit valve 50 in the valve seat 56 in the outside at valve chest, thus outlet valve 50 is extended between two rooms of valve chest.Elastic part 54 comprises core 58 and release district, periphery or lip 60.Release district, periphery 60 plays a role to form sealing in valve chest, thus seals and limit and be communicated with from room by the fluid of exit orifice, that is, at this moment the piston of barrier film is just shifting out this room.

With reference to Fig. 6 A and 6B, the outlet valve 50 of shown prior art is installed in the valve seat 56 being arranged in valve chest outside, thus makes outlet valve cover the exit orifice of the room of valve chest.First side 62 in shown release district, periphery 60 is on the position of loosening, that is, the state residing for being assembled in valve before in valve seat and being natural, the second shown side 64 is then on the sealing station of slight curvature, that is, thus restriction or prevent this fluid from flowing completely.This is that the piston occurred in when barrier film is when just shifting out the room that this outlet valve 50 installs.When release district, periphery 60 is significantly bending or when being carried away this seat to allow fluid to flow, this valve is on open position.As shown in the figure, the cross section in release district, periphery 60 comprises step part or by the mathematics profile represented by discrete or discontinuous function.But, " step " design should provide minimum bendingly to alleviate, this is because it only seals along the edge of lip 60, thus the effective sealing region 66 of valve 50 is restricted to fine rule (as on one side 64 see), create sealing inconsistency.

In addition, the inconsistency in effective sealing region can be produced during the valve manufacturing prior art.When carrying out shaping to the valve of prior art, shaping die generally includes two halves.In the place that two halves meet, likely flash occurs, it is the material extruded on the joint line of two halves.With reference to Fig. 5 B and 6B, this joint line 68 and 70 usually and the sealing the margin of the lip of inlet valve or outlet valve be coextensive.This can cause inconsistent sealing the margin thus cause inconsistent sealing.

In view of the problem of existing diaphragm pump, still need the bearing of a kind of cam/bearing unit of improvement and improvement/wobble plate assembly to improve life-span and the efficiency of pump, and significantly do not increase for the manufacture of time of pump, complexity and cost.In addition, still need a kind of check valve design of improvement to improve the effective sealing feature of entrance and exit valve.

Summary of the invention

Embodiments of the invention relate to a kind of diaphragm pump of improvement, and it comprises the wobble plate of improvement and bearing unit, the cam of improvement and the valve assembly of bearing unit and improvement to improve the reliability of pump, life-span and efficiency.In an embodiment of the present invention, cam and the bearing unit of improvement comprise cam, its by direct molding and forming to the inner ring of bearing in case cam is pulled open from bearing.In other embodiment of the present invention, wobble plate and the bearing unit of improvement comprise wobble plate, its by direct molding and forming to the outer ring of bearing in case wobble plate is pulled open from cam and bearing unit.In other embodiment of the present invention, the entrance improved and/or outlet non-return valve comprise circular release district, periphery, it forms the band of effective sealing area but not a line when on the sealing station being positioned at valve seat, and it eliminate or reduces sealing inconsistency and improves leakage efficiency.

Usually, diaphragm pump can comprise the pump case comprising protecgulum and bonnet for holding pump assembly according to an embodiment of the invention.The inlet that protecgulum comprises entrance, be fluidly communicated with entrance, outlet and with export the room of outlet be fluidly communicated with.This pump comprises motor sub-assembly, and it comprises motor and rotatable live axle, and wherein rotatable live axle extends through bonnet.Cam and bearing unit are attached to live axle and wobble plate is fixed to the outer ring of bearing and is fixed relative to it.Wobble plate comprises multiple piston structure, and it is corresponding with the piston structure of barrier film in the face being attached to the wobble plate with piston structure thereon.Piston structure and barrier film be combined to form piston.

Valve assembly to be fixed relative to barrier film/wobble plate assembly through housing and is comprised multiple room and multiple safety check, and wherein each room is communicated with each the selectivity fluid in room of outlet with the inlet of protecgulum.Safety check can switch between open position and closed sealing station, wherein on open position, this room is fluidly communicated with in room of outlet with inlet, and on closed sealing station, this room is not fluidly communicated with in entrance and exit room.

Cam and bearing unit are suitable for the nutation movement rotary motion of live axle being converted to wobble plate, thus make each piston engage a room of valve assembly in order, and then during suction stroke, force fluid to flow to this room from inlet and make fluid flow out this room during discharge stroke enter in room of outlet, stroke with reciprocation cycle to be produced the suction action of fluid by pump.

In one embodiment of the invention, the cam improved and bearing unit comprise cam, it comprises the plastic cam of the molding and forming be fixed in the inner ring of bearing, thus relative to the inner ring stationary cam of bearing, and its cam is attached to live axle to be fixed it relative to live axle.The annular wall of the inner ring of bearing comprises the structure limiting one or more recess, and wherein the annular wall of recess and cam engages, thus prevents cam from rotating relative to the inner ring of bearing.Further, outside first surface and outside second face of its cam comprise annular retaining lip, and annular retaining lip leans to the corresponding outside of the inner ring of bearing, wherein keep lip to prevent cam relative to the inner ring generation transverse shifting of bearing.

Extraly or alternately, wobble plate carries out molding and forming above the outer ring of bearing, thus rotate relative to outer ring and laterally fix wobble plate.In this embodiment, the outer ring of bearing comprises the structure limiting one or more scrobicula, and wherein the inner annular wall of wobble plate and scrobicula engage, thus prevent wobble plate from rotating relative to the outer ring of bearing.

The face of the inner ring of bearing comprises and is defined for for the wobble plate mould inner position of wobble plate molding and forming and the structure of the slot of stationary cam and bearing releasedly.At least one in first edge of the inner annular wall of wobble plate and the second edge comprises maintenance lip, and wherein keeps lip to lean to the corresponding outside of the outer ring of bearing thus to make wobble plate carry out transverse direction relative to the outer ring of bearing fixing.

The wobble plate improved according to an embodiment of the invention and bearing unit comprise present outer ring and inner ring bearing, present plastic rocker plate for the center ring of accommodating bearing wherein and multiple piston structures of radially extending from center ring, wherein wobble plate is fixed to the outer ring of bearing by molding and forming, thus relative to outer ring horizontal and in rotary moving in fix wobble plate.Bearing comprises the structure limiting one or more scrobicula, and wherein the inner annular wall of the center ring of wobble plate and scrobicula engage, thus prevent wobble plate from rotating relative to the outer ring of bearing.The face of the inner ring of bearing comprises and is defined for for the wobble plate mould inner position of wobble plate molding and forming and the structure of the slot of rigid bearing releasedly.

In one embodiment, at least one in the first edge of the inner annular wall of the center ring of wobble plate and the second edge comprises maintenance lip.Keep lip to lean to the corresponding outside of the outer ring of bearing thus make wobble plate carry out transverse direction relative to the outer ring of bearing fixing.

Wobble plate and bearing unit also comprise the cam of the plastics of molding and forming, and it is fixed in the inner ring of bearing, thus relative to the inner ring of bearing at middle stationary cam horizontal and in rotary moving.The annular wall of the inner ring of bearing comprises the structure limiting one or more recess, and wherein the annular wall of recess and cam engages, thus prevents cam from rotating relative to the inner ring of bearing.Further, the outside first surface of cam comprises annular retaining lip with at least one in outside second, and annular retaining lip leans to the corresponding outside of the inner ring of bearing, wherein keeps lip to prevent cam relative to the inner ring generation transverse shifting of bearing.

According to some embodiments of the present invention, valve assembly for diaphragm pump comprises the valve chest presenting the first side and the second side, first side comprises multiple room, wherein each room comprise limit entrance valve seat, multiple inlet opening and multiple exit orifice structure and the second side comprises the structure limiting multiple outlet valve seat.Inlet valve is arranged in the entrance valve seat of each room, multiple room, thus makes inlet valve optionally seal multiple inlet openings of this room.Outlet valve is arranged in each outlet valve seat of valve chest, thus makes outlet valve optionally seal multiple exit orifices of a room.

Each in inlet valve and outlet valve comprises mounting portion for installing valve in corresponding valve seat or pillar and the elastic part around one end, mounting portion, and wherein elastic part is suitable for corresponding entrance or the exit orifice of optionally closed chamber.Elastic part comprises core and external sealed part, and wherein outer seal portion is divided and comprised rounded sealing surface, thus makes the effective sealing region of valve comprise a band but not the fine rule that formed of the valve of prior art.

In one embodiment, valve chest comprises 5 rooms and is arranged in the entrance valve seat of each room.Second side of valve chest comprises 5 outlet valve seat and wherein a part for each outlet valve seat and two rooms overlaps.

Each entrance valve seat comprises the structure limiting mounting hole, and wherein the mounting portion of inlet valve comprises pillar, and this pillar is formed with the interference fit of mounting hole to fix inlet valve in inlet valve.Each outlet valve seat comprises the structure of the valve mounting recess of the pillar being defined for accommodating outlet valve.By radially (or laterally) stationary exit valve in the valve mounting recess that pillar inserted outlet valve seat.Subsequently, in addition, the pillar extended by the internal surface of the room of outlet from top cover is (or vertically) stationary exit valve vertically.

Above-mentioned summary of the present invention is not intended to describe each the disclosed embodiments or each embodiment of the present invention.Drawings and detailed description below more specifically example describe these embodiments.

Accompanying drawing explanation

By considering the following detailed description of each embodiment and understanding embodiments of the invention more completely by reference to the accompanying drawings, wherein:

Fig. 1 is the top perspective sectional view of cam according to prior art and bearing unit.

Fig. 2 is the top perspective sectional view of bearing according to prior art and wobble plate assembly.

Fig. 3 A is the plan view of the inlet valve according to prior art.

The viewgraph of cross-section of Fig. 3 B for getting along the 3B-3B of Fig. 3 A.

Fig. 4 A is the viewgraph of cross-section of the inlet valve of Fig. 3 B in valve seat.

Fig. 4 B is the viewgraph of cross-section of the inlet valve of Fig. 3 B in valve seat.

Fig. 4 C is the viewgraph of cross-section of the inlet valve of Fig. 3 B in valve seat.

Fig. 5 A is the plan view of the outlet valve according to prior art.

The viewgraph of cross-section of Fig. 5 B for getting along the 5B-5B of Fig. 5 A.

Fig. 6 A is the viewgraph of cross-section of the outlet valve of Fig. 5 B in valve seat.

Fig. 6 B is the viewgraph of cross-section of the outlet valve of Fig. 5 B in valve seat.

Fig. 7 A is diaphragm pump according to an embodiment of the invention.

Fig. 7 B is the exploded view of the diaphragm pump according to Fig. 7 A.

Fig. 8 is the top perspective view of the protecgulum inside of the diaphragm pump of Fig. 7 A according to an embodiment of the invention.

Fig. 9 A is the plan view of the first side of valve chest according to an embodiment of the invention.

Fig. 9 B is the plan view of the second side of the valve chest of Fig. 9 A.

Figure 10 A is the plan view of the first side of the valve chest of Fig. 9 A being provided with inlet valve wherein.

Figure 10 B is the plan view of the second side of the valve chest of Fig. 9 B being provided with outlet valve wherein.

Figure 11 is the sectional plain-view drawing of the diaphragm pump of Fig. 7 A and 7B.

Figure 12 is the top perspective sectional view of cam according to an embodiment of the invention and bearing unit.

Figure 13 is the top perspective view of bearing according to an embodiment of the invention.

Figure 14 A is the first half of cam die according to an embodiment of the invention.

Figure 14 B is the second half of the cam die of Figure 14 A.

Figure 15 is first half-sum the second half of the cam die of Figure 14 A and 14B be sealed.

Figure 16 is the top perspective sectional view of wobble plate according to an embodiment of the invention and bearing unit.

Figure 17 is the cam of Figure 12 and the top perspective view of bearing unit.

Figure 18 A is the front elevation of the first half of wobble plate mould according to an embodiment of the invention.

Figure 18 B is the front elevation of the first half of the wobble plate mould of Figure 18 A being wherein fixed with cam and bearing unit.

Figure 19 is first half-sum the second half of the wobble plate mould of Figure 18 A and 18B be sealed.

Figure 20 a is the plan view of inlet valve according to an embodiment of the invention.

Figure 20 b is the viewgraph of cross-section of inlet valve along 20B-20B of Figure 20 a.

Figure 21 a is the viewgraph of cross-section of inlet valve in valve seat of Figure 20 b.

Figure 21 b is the viewgraph of cross-section of inlet valve in valve seat of Figure 20 b depicting mould split line.

Figure 22 a is the plan view of outlet valve according to an embodiment of the invention.

Figure 22 b is the viewgraph of cross-section of outlet valve in 22a-22a of Figure 22 a.

Figure 23 a is the viewgraph of cross-section of inlet valve in valve seat of Figure 22 b.

Figure 23 b is the viewgraph of cross-section of inlet valve in valve seat of Figure 22 b depicting mould split line.

Figure 24 is the viewgraph of cross-section of the outlet valve of Fig. 5 A.

Although can easily carry out various amendment to the present invention and adopt alternative form, but still by example shown in accompanying drawing, details of the present invention be shown and will be described in detail.It is to be appreciated, however, that the present invention is not intended to limit the invention to described specific embodiment.On the contrary, present invention encompasses all modifications, equivalent and the replacement scheme that drop among the spirit and scope of the present invention.

Embodiment

With reference to Fig. 7 A-7B, a kind of diaphragm pump 100 generally includes two-part shell, and it comprises protecgulum 102 and bonnet 104, and wherein bonnet 104 is attached to motor sub-assembly 106 or holds motor sub-assembly 106.Alternatively, diaphragm pump 100 can comprise mounting mechanism 107, if pedestal, leg or mounting bracket are to fix from the teeth outwards or location diaphragm pump 100.

With reference to Fig. 8, protecgulum 102 has entrance 108 and outlet 110.Entrance 108 can be connected to inlet fluid line (not shown) and outlet 110 can be connected to outlet fluid line (not shown).Each in entrance and exit 108 and 110 is equipped with the annex for being connected to arrival line and egress line.Entrance 108 and each in outlet 110 are all towards inlet 112 and the room of outlet 114 of mutual exclusion.In one embodiment, room of outlet 114 to be arranged in the center region of protecgulum 102 and to be by defined with the wall surroundings 118 that outlet 110 is fluidly communicated with.Room of outlet 114 also comprises internal surface or bottom surface 116, and it has the one or more pillar 113a-113e extended vertically from it.Pillar 113 is suitable near or props up seat being arranged in the outer surface of outlet valve of the valve assembly on adjacent protecgulum 102, as hereafter described in more detail.Usually, quantity and the position of pillar 113 are corresponding with the quantity of the outlet valve seat of valve assembly and position.

Inlet 112 around room of outlet 114 and for be defined in wall surroundings 118 and protecgulum 102 sidewall between space.Inlet 112 is fluidly communicated with entrance 108.Those of ordinary skill in the art will be appreciated that, alternative configuration can be had, as long as entrance 108 is fluidly communicated with inlet 112, outlet 110 is fluidly communicated with room of outlet 114 and inlet 112 and room of outlet 114 are separated inlet 112 and room of outlet 114 are not directly communicated with each other in fluid.

Such as, motor sub-assembly 106 can comprise motor (not shown), and it has the live axle 122 extending through bonnet 104.Cam 124 is attached to the live axle 122 of motor sub-assembly 106 and can not rotates relative to live axle 122, is rotate together with live axle 122 on the contrary.Then, cam 124 is attached to wobble plate 128 through ball bearing 126.Particularly, cam 124 is attached to the inner ring 125 of bearing 126 in case cam 124 rotates relative to the inner ring 125 of bearing 126.Cam/bearing unit 200 will be discussed in more detail below.

Then, the outer ring 127 of bearing 126 is attached directly to wobble plate 128 to be formed in the wobble plate/bearing unit 300 shown in Figure 16.Particularly, wobble plate 128 comprises the structure of the central boss 130 being defined for accommodating cam/bearing unit 200 wherein.Connection between the outer ring 127 and wobble plate 128 of bearing 126 makes to stop gear/bearing unit 200 pulled out from wobble plate 128 and prevent wobble plate 128 from rotating relative to the outer ring 127 of bearing 126.Be described in more detail below wobble plate/bearing unit 300.

Wobble plate 128 is included in multiple piston portions 132 that the first surface 131 of wobble plate 128 is formed, and each piston portion 132 is extended from the first surface 131 of wobble plate 128.In one exemplary embodiment of the present invention as shown in figure 16, wobble plate 128 comprises 5 piston portion 132a-132e.But those of ordinary skill in the art also can consider more less than 5 or more piston portion by recognizing.

By elastic material, the single-piece barrier film 134 made as rubber is fixed to the first surface 131 of wobble plate 128 by traditional securing means (such as, screw).Barrier film 134 can be relatively flat maybe can comprise multiple piston structure 136 be sleeved on the corresponding piston portion 132 of wobble plate 128.In one embodiment, piston structure 136 comprises clothoid.

Valve assembly 138 is sandwiched between protecgulum 102 and barrier film 134.Valve assembly 138 generally includes valve chest 140, is multiplely fixed to the inlet valve 142 of the first side 141 of valve chest 140 and multiple outlet valve 144 being fixed to the second relative side 143 of valve chest 140.With reference to Fig. 9 A, the first side 141 of valve chest 140 comprises multiple room 146 and the quantity of this room 146 is corresponding with the quantity of the piston portion 132 of wobble plate 128.In one exemplary embodiment of the present invention as shown in the figure, valve chest 140 comprises 5 rooms 146.

Each room 146 comprises top 148 and bottom 150.Preferably, top 148 is circular and bottom 150 is taper, thus make the periphery of each room 146 be tear drop shape or egg type.But any other required shapes can be taked in each room 146, include but not limited to circle, rectangle, elongated shape or irregularly shaped.

The circular portion 148 on top comprises the structure being defined for the entrance valve seat 152 of locating inlet valve 142 thereon.Entrance valve seat 152 comprises multiple from the inlet opening 154 that it extends through, thus between corresponding room 146 and the inlet 112 of protecgulum 102, form fluid connection.Inlet opening 154 can be any suitable shape, and it includes but not limited to circle, elongated shape or ellipse.The circular portion 148 on top also comprises for the accommodating central mounting portion 158 of the inlet valve 142 being used for being fixed thereon by inlet valve 142 or the valve mounting hole 156 of pillar.

Preferably, inlet valve 142 is positioned at entrance valve seat 152, thus allows fluid to be entered corresponding room 146 from inlet 112 by inlet opening 154, but fluid can not leave room 146 by inlet opening 154.More specifically, when inlet valve 142 seat in the valve seat 152 of each room 146 time, the release district, periphery 160 of inlet valve 142 or lip cover inlet opening 154.Inlet valve 142 can switch between open position and sealing station, time wherein on open position, release district, periphery 160 is significantly bending or be lifted out this valve seat with the corresponding room 146 allowing fluid to be flowed to valve chest 140 from inlet 112 by inlet opening 154, and time on sealing station, limit or prevent from being flowed by the fluid of inlet opening 154 completely, thus not there is fluid connection between inlet 112 and each room 146.Be described in more detail below the design of inlet valve 142.

Second side 143 of valve chest 140 comprises center output area 158, and its periphery limited by recessed rail 160, wherein the shape of this recessed rail 160 and the wall surroundings 118 of protecgulum 102 corresponding, thus wall surroundings 118 is installed with the mode of recessed 160 one-tenth, rail matching relationship.In one embodiment of the invention, recessed rail 160 comprises the pentagonal track with 5 sides, and it corresponds to the pentagonal wall surroundings 118 of the room of outlet 114 limiting protecgulum 102.Center output area 158 be by the outer surface on the top 148 of the room 146 be fluidly communicated with the inlet 112 of protecgulum 102 around.

In center output area 158, the second side 143 of valve chest 140 comprises the multiple outlet valve seat 162 for locating outlet valve 144 thereon.The quantity of outlet valve seat 162 corresponds to the quantity of room 146.In the exemplary embodiment of shown in Fig. 9 B, the second side 143 of valve chest 140 comprises 5 outlet valve seat 162a-162e.Outlet valve seat 162 departs from the room 146 of the first side 141, thus each outlet valve seat 162 is extended between two rooms 146 or across on two rooms 146.

Outlet valve seat 162 comprises multiple exit orifice 164.Exit orifice 164 can be any suitable shape, and it includes but not limited to circle, elongated shape or ellipse.Each exit orifice in multiple exit orifice 164 extend through valve chest 140 make 150 one-tenth, the bottom of each exit orifice 164 and single chamber 146 optionally fluid be communicated with.

Outlet valve seat 162 also comprises the structure that defines for the central mounting portion 168 of accommodating outlet valve 144 or the valve recess 66 of pillar radially (or laterally) outlet valve 144 is fixed to it.In one embodiment, valve recess 66 does not extend fully through valve chest 140.Leant by the pillar 113 extended with the ground 116 of the room of outlet 114 from protecgulum 102, and vertically extraly (or vertically) stationary exit valve 144, as shown in Figure 24.

Preferably, outlet valve 144 is arranged in outlet valve seat 162, thus allows fluid flow out corresponding room 146 by exit orifice 164 and flow to the room of outlet 114 of protecgulum 102, but fluid can not enter the corresponding room 146 of valve chest 140 by exit orifice 164.More specifically, the release district, periphery 170 of outlet valve 144 or lip only cover the exit orifice 164 of the outlet port 162 installing it.Outlet valve 144 can switch between open position and sealing station, time wherein on open position, release district, periphery 170 is significantly bending or be lifted away from this to allow the fluid flowing of the room of outlet 114 of corresponding room 146 to the protecgulum 102 from the valve chest 140 being extended with exit orifice 164, and time on sealing station, limit or prevent from being flowed by the fluid of exit orifice 164 completely, thus not there is fluid connection between corresponding room 146 and room of outlet 114.Be described in more detail below the design of outlet valve 144.

At the run duration of pump, the live axle 122 of motor sub-assembly 106 rotates.Cam 124 serves as eccentric wheel, and the live axle 122 of motor sub-assembly 106 in rotary moving is converted to the pushing away of piston-roping and move by it.More specifically, cam 124 produces the offset movement of wobble plate 128, thus makes the piston portion 132 of wobble plate 128 force the piston structure 136 of barrier film 134 to pass in and out the room 146 of valve chest 140.The top 148 of each room 146 of valve chest 140 has suitable size with the piston structure 136 of the corresponding piston portion 132 of accommodating wobble plate 128 and barrier film 134.The piston portion 132 of wobble plate 128, barrier film 134 and the combination of fluid be present in room 146 create for piston reciprocating in this room 146, thus the relation of forming chamber/piston.

Fluids through inlet ports 108 is introduced into the inlet 112 of protecgulum 102.During piston bounces back from room 146 suction stroke in other words, the pressure in the room 146 of valve chest 140 reduces, thus inlet valve 142 is opened and forces fluid to be entered room 146 by the inlet 112 of inlet opening 154 from protecgulum 102.During piston enters room 146 to discharge stroke in other words, the pressure that pressure in room 146 increases above in room of outlet 114 is opened to force outlet valve 144, thus force fluid through exit orifice 164 delivery chamber 146 and enter room of outlet 114, and final through exporting 110 outflow room of outlet 114.Due to the offset cam effect of cam/bearing unit 200 and wobble plate 128 relation, wobble plate 128 can be subject to nutation movement, causes the piston reciprocating action of barrier film in succession to pass in and out the room 146 of valve chest 140 to provide suction action.

As in the background section discuss, the most common failure of conventional diaphragm pump is that the cam in bearing fluffs and/or bearing in wobble plate fluffs.This can reduce working time and/or the flow of pump significantly.

According to one embodiment of present invention, as shown in Figure 12, the cam/bearing unit 200 of improvement comprises by molding and forming by the plastic cam 202 of direct forming in the inner ring 204 of bearing 206.Cam 202 is included in annular retaining lip 208a and 208b on first surface 210 and the second face 212.First of first surface 210 keep first of the inner ring 204 of lip 208a and bearing 206 outside 214a lean and second keep second of the inner ring 204 of lip 208b and bearing 206 outside 214b lean in case cam 202 is drawn out bearing 206.One or more recess 216 is machined in the edge of the annular wall 218 of the inner ring 204 of bearing 206, thus the plastic materials of cam 202 is flow in recess 216, thus prevents cam 202 from rotating relative to the inner ring 204 of bearing 206.

In order to manufacture cam/bearing unit 200, with reference to Figure 14 A-15, employ the cam die 220 with the first half 220a and the second half 220b.The first half 220a of cam die 220 comprise the sunk part 222 for locating and keep bearing 206 wherein.The outer ring 224 of bearing 206 for making bearing 206 placed in the middle in the first half 220a of mould 220.Alternatively, magnet 226 can be placed in the diapire 228 of sunk part and/or annular sidewall 230 to help to keep bearing 206 in the first half 220a of mould 220.The first half 220a also comprise the center post of the center hole for the formation of cam 202.Center post 232 can comprise circular portion 234 and flat 236 to form the eccentric center hole 202 of the cam 202 for producing nutating action in wobble plate 302.Multiple rib 238 around center post 232 to form multiple hole 240 in the first surface 210 of cam 202.

The second half 220b of cam 220 comprise the center recessed portion 244 of sunk part 242 for holding bearing 206 and the center post 232 for the first half 220a that hold mould 220.Center recessed portion 244 has enough degree of depth and leans to make one end of center post 232 and center recessed portion 244, thus forms the center hole of cam 202 and make it extend through the entire depth of cam 202.The second half 220b also comprise multiple ribs 246 around center recessed portion 244 to be formed in the multiple holes in the second face 212 of cam 202.

Once bearing 206 is arranged in the first half 220a of mould 220, the first and second half 220a and 220b of mould 220 are then sealed together, as shown in Figure 15.Two halves 220a and 220b of mould seals on the inner ring 204 of bearing 206.Inner space 248 is that the inner ring 204 of the bearing 206 of the rib 238 and 246 of the first and second half 220b by being included in recess 216, center post 232 and mould 220 in the annular wall 218 of inner ring 204 limits.The second half 220b of mould 220 comprise the cast gate 250 for injection moulding.The plastic materials of melting is injected in the inner space 248 of mould 220 with formative gear 202.After cooling plastic material, immediately from mould 220, cam/bearing unit 200 is penetrated to the two halves deblocking of mould 220.

With reference to Figure 16 and 17, cam/bearing unit 200 is used to form wobble plate/bearing unit 300 further.The plastic rocker plate 302 that wobble plate/bearing unit 300 is comprised cam/bearing unit 200 as above and formed around cam/bearing unit 200 by molding and forming.Wobble plate 302 comprise have for wherein accommodating and keep cam/bearing unit 200 center hole 314 annulus 304, limit extend through multiple holes 308 of annulus 304 structure and from annulus 304 extend multiple piston portions 310.Each piston portion 310 comprises loop section 312 and the center hole 314 for accommodating and fixing barrier film 134 thereon.As discussed above, piston portion 310a drives the corresponding piston structure 136 of barrier film 134 to pass in and out the corresponding room 146 of valve chest 140 to form the relation for the piston/room of reciprocal suction action.

Outer ring 224 machining of the bearing 206 of cam/bearing unit 200 has one or more pit 316, thus the plastic materials of formation wobble plate 302 is flow in pit 316 to prevent cam/bearing unit 200 to pull out wobble plate 302 and to prevent wobble plate 302 from rotating relative to the outer ring 224 of bearing 206.

In order to manufacture wobble plate/bearing unit 300, with reference to Figure 18 A-19, employ the wobble plate mould 318 with the first half 318a and the second half 318b.The first half 318a of wobble plate mould 318 comprise the sunk part 320 for locating and keep cam/bearing unit 200 wherein.The dowel pin 322 that the bottom surface 324 of sunk part 320 is formed to correspond on the face of bearing 206 inner ring 204 mach slot 326 to form matching relationship, thus help is at the centralized positioning gear/bearing unit 200 of wobble plate 302.Sunk part 320 around and limit center cavity 328 to isolate cam 202, thus make cam 202 can not disturb the tool operation of mould 318.Alternatively, magnet or magnetic stripe 330 can be placed in the bottom of sunk part 320 and/or a part for annular sidewall to help to keep bearing 206 in the first half 318a of mould 318.

The first half 318a also comprise multiple pillars 332 of the center hole 314 of each piston portion 310 for the formation of wobble plate 302.In the embodiment shown in, each pillar 332 can comprise any shape in circular portion 334 and concave portions 336 or various shape to form required piston portion.One or more rib 338 between each piston portion 310 to be formed in the multiple holes 308 in the loop section 312 of wobble plate 302.

The second half 318b of mould 318 comprise the sunk part 340 for holding bearing 206 and the center cavity 328 for isolating cam 202 as mentioned above.

Once bearing 206 is arranged in the first half 318a of mould 318, the first and second half 318a and 318b of mould 318 are then sealed together, as shown in Figure 19.The two halves of mould seal on the outer ring 224 of bearing 206.Inner space 341 be by be included in outer ring 224 is formed pit, pillar and mould 318 the outer ring 224 of bearing 206 of rib of the first half 318a limit.The degree of depth for the sunk part of bearing 206 is slightly shallower than the degree of depth of inner space, thus make the inwall of the loop section of wobble plate 302 produce the slight overlapping or lip 342 leant with the outermost edge of every one side of the outer ring 224 of bearing 206, thus further wobble plate 302 is fixed to cam/bearing unit 200.

The second half 318b of mould 318 comprise the cast gate 344 of each piston portion injection moulding for wobble plate 302.The plastic materials of melting is injected in the inner space 341 of mould 318 to form wobble plate 302.After cooling plastic material, immediately from mould 318, wobble plate/bearing unit 300 is penetrated to the two halves 318a of mould and 318b deblocking.

As in the background section discuss, as shown in Fig. 3 A-6B, when entrance and exit valve of the prior art is placed in the valve seat of valve chest 140, the effective sealing region that it has is limited.

With reference to Figure 20 A-21B, it illustrates the inlet valve 142 of improvement.Inlet valve 142 comprises by suitable material, as the single structure that rubber is made.Inlet valve 142 comprises central mounting portion 158, as pillar and the elastic packing forming section 159 of first end around pillar 158 being positioned at pillar 158.Pillar 158 also comprises and has constant diameter D _milongitudinal intermediate portion 163 and can be contained in valve chest 140 room 146 hole in the second-phase opposite end 165 of pillar 158.The second-phase opposite end 165 of pillar 158 comprises tapered segment 167, and it has first diameter larger than the constant diameter of intermediate portion and the diameter reduced to the constant diameter being equal to or less than intermediate portion.First diameter thus create the shoulder of the one end around intermediate portion, with when pillar 158 is by the opposite side against valve chest 140 during this hole.Which ensure that and to be held in place in valve chest 140 at run duration inlet valve 142.

With reference to Figure 21 A and 21B, shown inlet valve 142 is installed in the valve seat 152 of the room 146 of valve chest 140.Elastic part 159 comprises core 169 and release district, periphery 160 or lip.The first edge 160a in shown release district, periphery 160 is on the position of loosening, namely, the state at valve nature place before being assembled in valve seat, the second shown edge 160b is then on the position of slight curvature or sealing, that is, at this moment the piston of barrier film is just moving in the room 146 being provided with inlet valve 142 to limit or to prevent this fluid from flowing completely.When release district, periphery 160 is significantly bending or when being carried away valve seat 152, inlet valve 142 is on open position, to allow to flow from the fluid of inlet 112 to room 146.

Remove formation " step " material partly in the valve of prior art and create the cross section successively decreased from release district, core 169 to periphery 160, thus the first side making release district, periphery 160 be included in elastic part 159 has and comprises the mathematics of continuous function or the circle of cross-sectional profiles or incline section 171, also be included in the second circular or sealing of tilting on the second side of elastic part 159 or seat part 177, wherein second seat part 177 also there is the mathematics or cross-sectional profiles that comprise continuous function.This edge surface design that is circular or that tilt is slight curving with the band forming sealing area but not a line, thus produces the effective sealing region 173 larger than the inlet valve of prior art and reduce sealing inconsistency.This effective sealing region 173 is by the first circumference 173a, what namely contact with valve seat in release district, periphery 160 is positioned at circumference in innermost radial position and the second circumference 173b, and the circumference in the outmost radial position being positioned at release district, periphery namely contacted with valve seat at valve defines.The circumferential bands extended between the first and second circumference 173a and 173b or ring are effective sealing region 173.

In addition, with reference to Figure 21 B, the mould split line 175 of mould moves to the non-critical areas of sealability without the valve of impact by this rounded edges in the mill, thus reduces or eliminates the source of sealing inconsistency.

With reference to Figure 22 A-22B, it illustrates the outlet valve 144 of improvement.Outlet valve 144 comprises by suitable material, as the single structure that rubber is made.Outlet valve 144 comprises central mounting portion 168, as pillar, be positioned at pillar 168 first end 168a around the elastic packing forming section 169 of pillar 168 and the second post 189.Pillar 168 also comprises the second-phase opposite end 168b of pillar 168 accommodating in longitudinal intermediate portion 175 with constant diameter Dmo and the recess 166 that can be formed in valve chest 140 outside.The intermediate portion 175 of pillar 168 by outlet valve 144 radially (or laterally) be fixed in recess 166, and the pillar 113 extended from the ground 116 of the room of outlet 114 of top cover 102 near or withstand outlet valve 144 the second pillar 189 with vertically extraly (or vertically) stationary exit valve 144, thus determine to be held in place in valve seat 162 at the run duration outlet valve 144 of pump.

Alternatively, the second-phase opposite end 168b of pillar 168 comprises tapered segment 179, and it has the first diameter of the constant diameter equaling intermediate portion 175 and becomes the diameter that reduces to the constant diameter being less than intermediate portion 175.

With reference to Figure 23 A, 23B and 24, shown outlet valve 144 is installed in the valve seat 162 of outside, room 146 of valve chest 140.Elastic part 169 comprises core 181 and release district, periphery 170 or lip.Shown lip 170 is on the position of slight curvature or sealing, and namely now the piston of barrier film is just shifting out the room 146 that is provided with outlet valve 144 thereon with restriction or the flowing of completely anti-fluid.When release district, periphery 170 significantly bends to be carried away valve seat 162, outlet valve 144 is on open position to allow to flow from the fluid of room 146 to room of outlet 114.The material of annular portion removing formation " step " part in the valve of prior art makes the cross section of the material near release district, periphery 170 thinner, this thinner cross section comprise circular edge on the internal surface being positioned at elastic part 169 or inclination seat part 183 and there is the mathematics or cross-sectional profiles that comprise continuous function.This edge surface design that is circular or that tilt bends with the band forming sealing area but not a line, thus produces the effective sealing region 185 larger than the outlet valve of prior art and reduce sealing inconsistency.This effective sealing region 185 is by the first circumference 185a, what namely contact with valve seat in release district, periphery 170 is positioned at circumference in innermost radial position and the second circumference 185b, and the circumference in the outmost radial position being positioned at release district, periphery 170 namely contacted with valve seat at valve defines.The circumferential bands extended between the first and second circumference 185a and 185b or ring are effective sealing region 185.

In addition, with reference to Figure 23 B, the mould split line 187 of mould moves to the non-critical areas of sealability without the valve of impact by rounded edges in the mill, thus reduces or eliminates the source of sealing inconsistency further.

Owing to having larger effective sealing region and the sealing inconsistency of minimizing, the combination of the entrance and exit valve design of improvement improves function and the efficiency of pump.

The diaphragm pump of improvement generally comprises the cam and bearing unit and wobble plate and a bearing unit that can resist the load applied thereon according to an embodiment of the invention, thus eliminates or reduce displacement that cam occurs from bearing or the displacement that wobble plate occurs from bearing.Compared with the pump of prior art, this can play a role to increase working time of pump and reliability up to 10 times or higher multiple.Additionally or can alternatively, the Curve guide impeller of the entrance and exit safety check of valve chest creates by increasing effective sealing region with valve seat and better seals conformity.Due to the generation that it eliminate or reduces leakage and/or adverse current, therefore which increases the efficiency of pump, and be maintained by the high flow efficiency of pump simultaneously.

Description above proposes many concrete details, which provides the thorough understanding to various embodiment of the present invention.It is obvious to those skilled in the art that can when do not possess in these details some or all put into practice in various embodiment disclosed herein.In other cases, in this article assembly known to those skilled in the art is not described in detail in order to avoid unnecessarily fuzzy the present invention.Even if it being understood that in the description above and set forth many feature and advantage of various embodiment, but the present invention is all only illustrative together with the details of the 26S Proteasome Structure and Function of various embodiment.But, also can adopt principle of the present invention and spirit and construct other embodiments.Therefore, this application is intended to contain any amendment of the present invention or modification.

In order to explain claim of the present invention, unless its clear and definite being intended that refer in the claims concrete term " for ... mode " or " for ... step ", all can not call the regulation of the 6th section the 112nd article that United States code the 35th is compiled outward.

Claims (24)

1. a diaphragm pump, it motor comprising wobble plate assembly and there is rotating driveshaft, described wobble plate assembly comprises:

Bearing;

Be attached to the wobble plate of described live axle through bearing, wherein said wobble plate is fixed to the outer ring of described bearing by molding and forming, thus described wobble plate horizontal and in rotary moving in fix relative to described outer ring.

2. pump according to claim 1, wherein said pump also comprises the cam described bearing being attached to described live axle, wherein said cam is included in the plastic cam of molding and forming fixing in the inner ring of described bearing, described cam is fixed relative to the described inner ring of described bearing, and wherein said cam is attached to described live axle that it is fixed relative to described live axle.

3. pump according to claim 1, described diaphragm pump also comprises valve assembly, and described valve assembly comprises:

There is the valve plate of first surface and second surface, described first surface comprises the structure limiting multiple entrance valve seat, described second surface comprises the structure limiting multiple outlet valve seat, each entrance and exit valve seat have limit opening structure periphery arrange seat surface;

Multiple outlet valve, each outlet valve has pillar and radially to extend and around the sealing forming section of described pillar from described pillar; And

Multiple inlet valve, each inlet valve has pillar and radially to extend and around the sealing forming section of described pillar from described pillar,

Wherein said outlet and inlet valve respectively have cross-sectional profiles, it comprise the inclination of the peripheral edge being positioned at described sealing forming section seat part, described inclination seat part can optionally with described in corresponding valve seat seat surface engage to form effective sealing area, thus anti-fluid flows through the described opening of described respective valve seat.

4. pump according to claim 3, wherein said effective sealing region is restricted to the region between the first circumference and the second circumference, be formed as band, described first circumference is positioned at the first position on described peripheral edge, and described second circumference is inwardly spaced apart thus make described first circumference be greater than described second circumference from described primary importance.

5. pump according to claim 3, wherein the described opening of each valve seat comprises the structure limiting multiple hole.

6. pump according to claim 3, the described first surface of wherein said valve seat comprises the structure limiting multiple room, and wherein inlet valve seat is positioned at each indoor.

7. pump according to claim 6, wherein said wobble plate comprises the projection that multiple first surface from described wobble plate extends, and described projection is configured as the room optionally moved into and shift out in described multiple room.

8. pump according to claim 3, wherein said pump also comprises the protecgulum with inlet and room of outlet, wherein each described opening of described entrance valve seat is fluidly communicated with the described inlet of described protecgulum, and each described opening in described outlet valve seat is fluidly communicated with the described room of outlet of described protecgulum.

9. pump according to claim 8, each in wherein said outlet valve can optionally switch between open position and sealing station, in described open position, the described inclination of described outlet valve seat part not with described in described outlet valve seat seat part engage to make fluid can flow through described opening in the described room of outlet of described protecgulum, and on described sealing station, described inclination seat part engage with described seat part and flow through described opening with limit fluid.

10. pump according to claim 8, each in wherein said inlet valve can optionally switch between open position and sealing station, in described open position, the described inclination of described inlet valve seat part not with described in described entrance valve seat seat part engage to make fluid can flow through described opening from the described inlet of described protecgulum, and on described sealing station, described inclination seat part engage with described seat part and flow through described opening with limit fluid.

11. 1 kinds of wobble plates and bearing unit, described wobble plate and bearing unit comprise:

There is the bearing of outer ring and inner ring; And

There is the plastic rocker plate for the center ring of accommodating bearing wherein;

Wherein said wobble plate is fixed to the described outer ring of described bearing by molding and forming, thus described wobble plate horizontal and in rotary moving in fix relative to described outer ring.

12. wobble plate according to claim 11 and bearing uniies, wherein said bearing comprises the structure limiting one or more pit, inner annular wall and the described pit of the described center ring of wherein said wobble plate engage, thus prevent described wobble plate from rotating relative to the described outer ring of described bearing.

13. wobble plate according to claim 11 and bearing uniies, the face of the described inner ring of wherein said bearing comprises the structure limiting groove, described groove be used for for described wobble plate molding and forming wobble plate mould inner position and fix described bearing releasedly.

14. wobble plate according to claim 11 and bearing uniies, at least one in first edge of the inner annular wall of wherein said center ring wobble plate and the second edge comprises maintenance lip, and wherein said maintenance lip leans to the corresponding outside of the described outer ring of described bearing, thus make described wobble plate laterally fixing relative to the described outer ring of described bearing.

15. wobble plate according to claim 11 and bearing uniies, the cam comprising the plastics of molding and forming is fixed in the described inner ring of described bearing, thus described cam horizontal and in rotary moving in fix relative to the described inner ring of described bearing.

16. wobble plate according to claim 15 and bearing uniies, the annular wall of the described inner ring of wherein said bearing comprises the structure limiting one or more recess, the annular wall of wherein said recess and described cam engages, thus prevents described cam from rotating relative to the described inner ring of described bearing.

17. wobble plate according to claim 15 and bearing uniies, the outside first surface of wherein said cam comprises annular retaining lip with at least one in outside second, described annular retaining lip leans to the corresponding outside of the described inner ring of described bearing, and wherein said maintenance lip prevents described cam relative to the described inner ring generation transverse shifting of described bearing.

18. 1 kinds of diaphragm pumps, described diaphragm pump comprises:

Housing, it comprises protecgulum and bonnet, wherein said protecgulum comprises entrance, the inlet that is fluidly communicated with described entrance, outlet and the room of outlet that is fluidly communicated with described outlet;

Motor sub-assembly, it comprises motor and rotatable live axle, and wherein said rotatable live axle limits the structure of opening in extending through and covering in the rear;

Be attached to cam and the bearing unit of described live axle, described cam and bearing unit comprise cam and bearing, described cam is included in the plastic cam of molding and forming fixing in the inner ring of described bearing, thus described cam is fixed relative to the described inner ring of described bearing, and wherein said cam is attached to described live axle to fix relative to described live axle;

Be fastened to the outer ring of described bearing and the wobble plate fixing relative to the outer ring of described bearing, described wobble plate comprises multiple piston structure;

Be attached to the barrier film in the plate face of described wobble plate actively, wherein said barrier film and described multiple piston structure form multiple piston; And

Valve assembly, it comprises multiple chamber and multiple safety check, and wherein each chamber is communicated with each the selectivity fluid in described room of outlet with described inlet,

Wherein said cam and bearing unit are suitable for the nutation movement rotary motion of described live axle being converted to described wobble plate, thus make each piston engage the chamber of described valve assembly in order, force fluid to flow to described chamber from described inlet with to-and-fro motion and flow out described chamber thus.

19. pumps according to claim 18, the annular wall of the described inner ring of wherein said bearing comprises the structure limiting one or more recess, the annular wall of wherein said recess and described cam engages, thus prevents described cam from rotating relative to the described inner ring of described bearing.

20. pumps according to claim 18, wherein said wobble plate molding and forming is above the outer ring of described bearing, thus described wobble plate rotates to and laterally fixes relative to described outer ring.

21. pumps according to claim 20, the outer ring of wherein said bearing comprises the structure limiting one or more pit, inner annular wall and the described pit of wherein said wobble plate engage, thus prevent described wobble plate from rotating relative to the described outer ring of described bearing.

22. pumps according to claim 20, the face of the described inner ring of wherein said bearing comprises the structure limiting groove, described groove be used for for described wobble plate molding and forming wobble plate mould inner position and fix described cam and bearing unit releasedly.

23. pumps according to claim 18, in the outside first surface of wherein said cam and second, outside, at least one comprises annular retaining lip, described annular retaining lip leans to the corresponding outside of the inner ring of described bearing, and wherein said maintenance lip prevents described cam relative to the inner ring generation transverse shifting of described bearing.

24. pumps according to claim 20, at least one in first edge of the inner annular wall of wherein said wobble plate and the second edge comprises maintenance lip, and wherein said maintenance lip leans to the corresponding outside of the described outer ring of described bearing thus makes described wobble plate laterally fixing relative to the described outer ring of described bearing.