CN102536754A

CN102536754A - Pump device and pump system

Info

Publication number: CN102536754A
Application number: CN2011103868826A
Authority: CN
Inventors: 野野村勇治; 大坂常男; 糸山龙二
Original assignee: Ulvac Kiko Inc
Current assignee: Ulvac Kiko Inc
Priority date: 2010-11-30
Filing date: 2011-11-29
Publication date: 2012-07-04
Anticipated expiration: 2031-11-29
Also published as: KR101299550B1; CN102536754B; KR20120059406A; JP5770458B2; JP2012117440A; TWI503482B; TW201231814A

Abstract

The present invention provides a pump device which can limit fluid discharge in operation stop. The pump device (3) is provided with the following components: a housing (10), a movable component (30), a suction valve (41), a discharge valve (42) and a valve mechanism (50). The housing (10) is provided with a pump chamber (100) which can be respectively connected with a suction inlet (101) and a discharge outlet (102). A movable component (30) can move in the housing (10). Fluid suction into the pump chamber (100) and fluid discharge out of the pump chamber (100) are performed alternately. The discharge valve (42) is equipped between the pump chamber (100) and the discharge outlet (102) and allows flow of the fluid of which the pressure is larger than or equal with a first pressure from the pump chamber (100) to the discharge outlet (102). The valve mechanism (50) is equipped on the housing (10) and suppresses the fluid of which the pressure is larger than the first pressure and is smaller than or equal with the second pressure from the suction inlet (101) to the discharge outlet (102).

Description

Pump-unit and pumping system

Technical field

The present invention relates to a kind of conduct for example pump-unit that uses of pressurized machine or suction booster and pumping system with this pump-unit.

Background technique

As making gases such as gaseous fuel or oxygen, cooling water or hydraulic pressure wet goods liquid etc. rise to the machine of required pressure, the pump-unit that is called pressurized machine or suction booster is widely known by the people.In this pump-unit, use Roots pump or diaphragm pump etc., for example, in following patent documentation 1, record the diaphragm pump that the pressurized machine of the gaseous fuel in the battery system that acts as a fuel uses.

The prior art document

Patent documentation

Patent documentation 1: the spy opens the 2009-47084 communique

Summary of the invention

Existing pressurized machine does not possess the hydrodynamic pressure that imports is reduced pressure and the function of discharging.Therefore; Provide in the pumping system more than or equal to the pressure source of the fluid of certain pressure being connected with suction port to pressurized machine; The fluid that is fed to suction port when pressurized machine shuts down is discharged from pressurized machine, and difference according to circumstances might make system produce fault.

In view of above situation, the purpose of this invention is to provide a kind of pump-unit and pumping system that can limit fluid is discharged when running stops.

In order to reach above-mentioned purpose, the pump-unit that a mode of the present invention relates to comprises: housing, movable link, first valve, second valve and the 3rd valve.

The pump chamber that said housing has suction port, exhaust port and can be communicated with said suction port and said exhaust port respectively.

Said movable link can move in the inside of said housing, carries out alternately sucking fluid and discharging said fluid from said pump chamber to said pump chamber.

Said first valve is installed between said suction port and the said pump chamber, allows said fluid to flow to said pump chamber from said suction port.

Said second valve is installed between said pump chamber and the said exhaust port, during more than or equal to first pressure, allows said fluid to flow to said exhaust port from said pump chamber at the fluid of said pump chamber.

Said the 3rd valve is installed on the said housing, and the said fluid between said suction port and said exhaust port limits said fluid and flows to said exhaust port from said suction port greater than said first pressure and when being less than or equal to second pressure.

In addition, in order to reach above-mentioned purpose, the pumping system that a mode of the present invention relates to comprises: pump-unit, pressure source and processing division.

Said pump-unit has housing, movable link, first valve, second valve and the 3rd valve.

Said housing has the suction port with said pressure source contact, with the exhaust port of said processing division contact and the pump chamber that can be communicated with said suction port and said exhaust port respectively.

Said movable link can move in the inside of said housing, carries out alternately sucking fluid and discharging fluid from said pump chamber to said pump chamber.

Said second valve is installed between said pump chamber and the said exhaust port, allows to flow to said exhaust port from said pump chamber more than or equal to the said fluid of first pressure.

Said the 3rd valve is installed on the said housing, and restriction is flowed to said exhaust port from said suction port greater than said first pressure and the said fluid that is less than or equal to second pressure.

Said pressure source is connected in said suction port, and the fluid that is less than or equal to said second pressure is provided to said pump-unit.

Said processing division is connected in said exhaust port, handles the fluid of discharging from said pump-unit.

Description of drawings

The schematic representation of the pumping system that Fig. 1 relates to for a mode of execution of the present invention;

The sectional drawing of the pump-unit that Fig. 2 relates to for a mode of execution of the present invention;

Fig. 3 is assembled in the sectional oblique drawing of the structure of the valve system in the said pump-unit for expression;

Fig. 4 is the sectional drawing of said valve system;

The experimental result that Fig. 5 carries out the running of pump-unit repeatedly for expression and the time of the discharge flow rate of the pump-unit when stopping to change;

Fig. 6 is employed pipeline configuration figure in the experiment shown in Figure 5;

Fig. 7 is the figure of an effect of the said pump-unit of explanation;

The sectional drawing of the pump-unit that Fig. 8 relates to for second mode of execution of the present invention;

The part exploded perspective view of the pump-unit that Fig. 9 relates to for the 3rd mode of execution of the present invention;

Figure 10 is the figure of an effect of explanation pump-unit shown in Figure 9;

The oblique drawing of the pump-unit that Figure 11 relates to for the 4th mode of execution of the present invention;

Figure 12 is the pith sectional drawing of pump-unit shown in Figure 11;

Figure 13 is the plan view of pump-unit shown in Figure 11;

Figure 14 is the rear view of pump-unit shown in Figure 11;

Figure 15 is the planimetric map of pump-unit shown in Figure 11;

Figure 16 is the worm's eye view of pump-unit shown in Figure 11;

Figure 17 is the right elevation of pump-unit shown in Figure 11;

Figure 18 is the left view of pump-unit shown in Figure 11.

Description of reference numerals

1 pumping system

2 pressure sources

3,6,7,8 pump-units

4 processing divisions

10,70,80 housings

20 Ma Qu move portion

30 movable links

31 barrier films

41 suction valves

42 expulsion valves

50,60 valve systems

51,61 valve members

74 space portions

100 pump chambers

101 suction ports

102 exhaust ports

Embodiment

The pump-unit that a mode of execution of the present invention relates to comprises: housing, movable link, first valve, second valve and the 3rd valve.

In said pump-unit, movable link periodically changes through the volume that makes pump chamber, carries out alternately sucking fluid and discharging fluid from pump chamber to pump chamber.Fluid both can also can be liquid for gas.When sucking fluid, import fluid via first valve to pump chamber from suction port.When discharging fluid, the fluid that is directed into pump chamber is compressed into more than or equal to first pressure through movable link in pump chamber, thereby opens second valve and discharge from exhaust port.Through carrying out above operation repeatedly, discharge fluid with pressure more than or equal to first pressure from exhaust port.

The pressure of second valve in pump chamber reached more than or equal to the moment of said first pressure to be opened, and allows fluid to flow to exhaust port from pump chamber.Therefore, when for example pump-unit shut down, if fluid is directed in the pump chamber with the pressure more than or equal to first pressure through suction port, then second valve was opened, and fluid flows to exhaust port.

Therefore, said pump-unit has the 3rd valve.The 3rd valve restriction is greater than first pressure and be less than or equal to the flowing of fluid of second pressure.Therefore, when pump-unit shuts down, even have when first pressure and the fluid of pressure that is less than or equal to second pressure are in suction port is directed into pump chamber, also can hinder flowing of fluid through the 3rd valve, suppression fluid is discharged from exhaust port.Fluid is discharged accidentally when therefore, suppressing to shut down.

In addition, fluid is discharged accidentally when utilizing said pump-unit can suppress pump-unit to shut down, and therefore, said pump-unit also goes for suction port and is connected with in the pumping system of fluid pressure source.Therefore, can eliminate when shutting down and spill the situation that the fluid causes system breaks down from exhaust port.

Said second pressure can suitably be set, for example, with the pressure of the fluid that is directed into suction port or the permission flow of the fluid of discharging under the state of shutting down etc. be that benchmark is set.The meaning of " cut off and flow " and the meaning of " though do not cut off flow but reduce its flow " have been comprised in " restricting flow ".

The 3rd valve is installed on the housing.The 3rd valve both can be installed on the suction oral-lateral, also can be installed on the discharge oral-lateral.In one embodiment, the 3rd valve is disposed at than second valve more near the position of discharging oral-lateral.Therefore, can not hinder flowing of the fluid that imports to pump chamber, thereby guarantee stable pump performance.

The 3rd valve both can be for having cut off the structure that flows of the fluid that is less than or equal to said second pressure fully, the structure that also can change for its aperture between said first pressure and said second pressure interimly.Under the former situation, the 3rd valve can be made up of for example solenoid valve etc.

On the other hand, under the latter's the situation, the 3rd valve adopts according to the pressure aperture and becomes big valve arrangement.For example, the 3rd valve have valve seat and can be positioned on the valve seat and aperture according to more than or equal to said first pressure and be less than or equal to second pressure the pressure continuity the valve member that changes.As valve, can be suitable for for example umbrella valve with this valve arrangement.Therefore, can realize from the low discharge control of the fluid of said pump-unit discharge.

Said housing also can further have by the part of the stream between said second valve of contact and said the 3rd valve expands the space portion that forms.Said space portion plays the buffer space of the pulsation of the fluid that buffering discharges.Therefore, can reduce the pulsation of fluid, discharge fluid with stable flow rate.In addition, according to the driving of discharge flow rate control pump device the time, can realize the stable drive controlling of pump-unit.

Said pump-unit can be made up of diaphragm pump.At this moment, said movable link comprises the deformable membrane of dividing said pump chamber.Therefore, small-sized pump-unit can be provided.

The pumping system that a mode of execution of the present invention relates to comprises: pump-unit, pressure source and processing division.

Said housing has exhaust port of getting in touch with the suction port of said pressure source contact, with said processing division and the pump chamber that can be communicated with said suction port and said exhaust port respectively.

Utilize said pumping system; Even when pump-unit shuts down; Have when first pressure and the fluid of pressure that is less than or equal to second pressure are in pressure source is directed into pump chamber, also can hinder flowing of fluid through the 3rd valve, suppression fluid is discharged from exhaust port.Fluid is discharged accidentally when therefore suppressing to shut down.In addition, can eliminate when shutting down and spill the situation that the fluid causes system breaks down from exhaust port.

Said processing division does not have special qualification, comprises being used to utilize the various machines that come produce power or power from the fluid of pump-unit discharge, for example: converter, burner, generator, cylinder assembly, various engine.

Followingly mode of execution of the present invention is described with reference to accompanying drawing

First mode of execution

Pumping system

Fig. 1 is for representing the schematic representation of the pump-unit that a mode of execution of the present invention relates to.The pump-unit 1 that this mode of execution relates to has pressure source 2, pump-unit 3, processing division 4 and control device 5.

Pressure source 2 is connected in the suction side (first side) of pump-unit 3, and processing division 4 is connected in the discharge side (second side) of pump-unit 3.Pressure source 2 can also can be that the compressor equal pressure produces the source for containers such as the jar of the fluid (gas or liquid) of taking in specified pressure, high-pressure gas cylinders both.Pump-unit 3 is promoted to the pressure P 2 of appointment as the fluid of the pressure P 1 that will import from pressure source 2 and its pressurized machine or suction booster that offers processing division 4 is played a role.Processing division 4 is handled the fluid that pump-unit 3 provides, produce power or power etc.The running of control device 5 control pump devices 3, but also can control the whole system that comprises processing division 4.

Pumping system 1 for example is applied in the fuel cell system.At this moment, pressure source 2 is equivalent to fuel pot, and 3 pairs of gaseous fuels of pump-unit (for example town gas (biogas), LPG (LPG)) carry out supercharging and offer processing division 4.Include in the processing division 4 with gaseous fuel convert into converter, the storing hydrogen of hydrogen fuel cell, make Power Generation Section that hydrogen and oxygen reacts etc.

Pump-unit

Next, with reference to Fig. 2 being elaborated to pump-unit 3.Fig. 2 is the sectional drawing of the structure of expression pump-unit 3.In this mode of execution, pump-unit 3 is made up of diaphragm pump.

Pump-unit 3 has metal shell 10 and drive portion 20.Housing 10 has pump body 11, pump head 12 and pump head lid 13.Drive portion 20 has motor 21 and motor casing 22.

Pump body 11 forms the operating space 105 that holds movable link 30 in the inside of housing 10.The connecting rod 33 that movable link 30 has barrier film 31, be fixed in the anchor clamps 32 on the barrier film 31 and anchor clamps 32 be connected in motor 21.

Barrier film 31 is formed by discoid rubber material, and its edge part is held between pump body 11 and the pump head 12.Anchor clamps 32 are fixed in the central part of barrier film 31, and a plurality of parts of clamping barrier film 31 constitute by being assembled into up and down.Connecting rod 33 becomes one with the mode and the anchor clamps 32 of the central part that runs through barrier film 31.Connecting rod 33 is connected in the surface of the eccentric cam 35 on the running shaft 210 that is installed in motor 21 via bearing 34.

Pump head 12 has suction port 101 and exhaust port 102, be disposed at ring-type base 110 above.Base 110 is installed on the open end on the top of pump body 11, with pump head 12 edge part of clamping barrier film 31 together.Form pump chamber 100 between pump head 12 and the barrier film 31.

Pump head 12 has the suction path T1 of contact suction port 101 and pump chamber 100 and the drain passageway T2 of contact pump chamber 100 and exhaust port 102 respectively.Pump chamber 100 can be communicated with suction port 101 and exhaust port 102 respectively via sucking path T1 and drain passageway T2.On suction path T1 and drain passageway T2, be separately installed with suction valve 41 (first valve) and expulsion valve 42 (second valve).

Suction valve 41 is installed on the pump head 12, so that the inaccessible inlet hole h1 that sucks path T1 that forms.Suction valve 41 is made up of the leaf valve of the end that is installed on the inlet hole h1 that closes on pump chamber 100, allows fluid to flow to pump chamber 100 from suction port 101.The cracking pressure of suction valve 41 (opening the required minimum pressure of suction valve 41) does not have special qualification, as long as import the cracking pressure of the gas degree of target flows when having pump-unit work to pump chamber 100.Therefore, the cracking pressure of suction valve 41 also can be the low pressure of pressure than the gas that provides to pump-unit 3 from pressure source 2.

On the other hand, expulsion valve 42 is installed on the pump head 12, so that the inaccessible tap hole h2 that forms drain passageway T2.Expulsion valve 42 is made up of the leaf valve of the end of the tap hole h2 of the opposite side that is installed on pump chamber 100, allows fluid to flow to exhaust port 102 from pump chamber 100.The cracking pressure of expulsion valve 42 (opening the required minimum pressure of expulsion valve 42) does not have special qualification, is set at the pressure that can obtain required head pressure, in this mode of execution, is set at the pressure bigger than the cracking pressure of suction valve 41 (first pressure).

Pump head lid 13 is installed on the top of pump head 12.Sucking path T1 and drain passageway T2 is able to respectively form with 13 combinations of pump head lid through pump head 12.Pump body 11, pump head 12 and pump head lid 13 use a plurality of screw member B and are fixed as one.

Motor 21 is made up of the dc brushless motor of may command rotation number, is accommodated in the inside of motor casing 22 cylindraceous.Motor 21 has running shaft 210, stator 211 and rotor 212.Stator 211 is fixed in the inner face of motor casing 22, rotor 212 be fixed in running shaft 210 around.Running shaft 210 is supported on the motor casing 22 via bearing 23,24, and its front end is installed on the rotating center of eccentric cam 35.

Eccentric cam 35 with its rotating center with respect to the inner ring of bearing 34 and eccentric mode forms.Therefore, when the driving according to motor 21, running shaft 210 is around its when rotation axle, and eccentric cam 35 together rotate with running shaft 210, thereby makes that 105 inside comes and goes mobile on above-below direction movable link 30 in the operating space.Therefore, the volume of pump chamber 100 periodically changes, and can obtain the pumping function of appointment.The round amount of movement (stroke amount) of movable link 30 is by the offset decision of eccentric cam 35.

Pump-unit 3 further has valve system 50 (the 3rd valve).In this mode of execution, valve system 50 is installed on exhaust port 102.Valve system 50 has the function that restriction gas flows out from gas discharge outlet 102 when pump-unit 3 shuts down.

Fig. 3 is the sectional oblique drawing of the structure of expression valve system 50, and Fig. 4 representes the sectional drawing of valve system 50.The metal housing 52 that valve system 50 has rubber system valve member 51 and takes in valve member 51.

The second end 522 that outer cover 52 has the first end 521 of the exhaust port 102 that is connected in housing 10 and is connected in the pipeline of getting in touch with processing division 4 (omitting in the diagram).Be equiped with seal ring 54 around the first end 521, first end 521 is seal-installed on the inside of exhaust port 102 through sealing ring 54.

The inside of outer cover 52 is formed with the internal path 523 of 522 of contact first end 521 and the second ends.In the substantial middle portion of internal path 523, the wall portion 53 that has a plurality of holes 531 around central part and the central part vertically is formed on the wall of internal path 523, via these holes 531, and can be with being communicated with between first end 521 and the second end 522.

Valve member 51 is made up of umbrella valve.That is, valve member 51 forms roughly discoid, is installed in through the axial region 511 that will be formed at its central part in the center hole of wall portion 53 to be disposed in the internal path 523.The edge part 512 of valve member 51 be formed at towards lip-deep valve seat 532 Elastic Contact of the wall portion 53 of the second end 522, stop fluid from the second end 522 side direction first ends 521 side flow.That is, valve member 51 plays check valve.

On the other hand, valve member 51 flows along direction from first end 521 side direction the second ends 522 sides for fluid, thereby through allowing flowing of this fluid to drive valve more than or equal to certain pressure.At this moment, valve member is 51 as shown in Figure 4, leave pump seat 532 through edge part 512 to the second end 522 side resiliently deformables, removes the partition state of the internal path 532 that is formed by valve member 51.Fluid lower than said specified pressure is depressed, and edge part 512 is taken a seat to valve seat 532, keeps the partition state of internal path 523.

Valve member 51 uses the rubber material that various process gass are had tolerance.When for example process gas uses biogas or propane gas, use to have nitrile butadiene rubber (NBR), hydrogenated nitrile-butadiene rubber (HNBR), fluorine rubber (FKM) etc. have the rubber material of tolerance to hydrocarbon gas such as biogas or propane gas valve member 51.The thickness of valve member 51, size do not have special qualification, are set at thickness, the size that can guarantee cracking pressure that can corresponding all size respectively.

That is, the cracking pressure of valve member 51 (opening the required minimum pressure of valve member 51) is set at the high pressure of cracking pressure (first pressure) than expulsion valve 42 at least.And valve member 51 restriction is greater than the cracking pressure of expulsion valve 42 and be less than or equal to the gas flow of specified pressure (second pressure).

The cracking pressure of valve member 51 decides with reference to the gas pressure P1 that the pressure source 2 of pumping system 1 is provided.In this mode of execution, the cracking pressure of valve member 51 is set at the high pressure of gas pressure P1 in specific pressure source 2.Therefore, even under the situation of the gas pressure P1 of pressure source 2, also can shut down and flow out to processing division 4 from exhaust port 102, thereby can prevent effectively that gas from flowing out to processing division 4 after the body of dying at pump-unit 3 greater than the cracking pressure of expulsion valve 42.

Need to prove, be described below that the cracking pressure of said valve member also can be set at the pressure less than the gas pressure P2 of pressure source 2.

The operation of pump-unit

Next, the typical example of operation to the pump-unit 3 of above-mentioned formation describes.

Pump-unit 3 drives through the motor 21 that starts drive portion 20.The rotation number of motor 21 for example reaches the discharge flow rate of appointment by control device 5 controls according to the flowmeter that is arranged at the discharge side of pump-unit 3.Motor 21 makes eccentric cam 35 rotations via running shaft 210, thereby makes movable link 30 stroke with appointment in operating space 105 come and go mobile.Therefore, the barrier film 31 of dividing pump chamber 100 will move up and down, and the volume of pump chamber 100 periodically changes.

Movable link 30 periodically changes through the volume that makes pump chamber 100, comes to carry out alternately to suck gas and discharge gas from pump chamber 100 to pump chamber 100.Promptly; Importing pressure via suction valve 41 to pump chamber 100 from the pressure source 2 that is connected in suction port 101 is gaseous fuel pump chamber 100 through the movable link compression supercharging of the gaseous fuel of P1 (for example 2kPa (manometer pressure)) to pump chamber 100 importings, and expulsion valve 42 and valve system 50 are opened.Through carrying out above operation repeatedly, to processing division 4 head pressures the gaseous fuel of P2 (for example 15kPa (manometer pressure)) from exhaust port 102.

Wherein, the pressure of expulsion valve 42 in pump chamber 100 reached more than or equal to the moment of the cracking pressure of expulsion valve 42 to be opened, and allows gas to flow to exhaust port 102 from pump chamber 100.Therefore, when pump-unit 3 shut down, if import gases with the pressure more than or equal to the cracking pressure of expulsion valve 42 to pump chamber 100 from suction port 101, then expulsion valve 42 was opened, and fluid flows to exhaust port 102.

Therefore, at this mode of execution pump-unit 3, exhaust port 102 places are equipped with valve system 50.Valve system 50 has the high cracking pressure of gas pressure (P1) in specific pressure source 2.Therefore, when pump-unit 3 shuts down, even the gas of pressure P 1 from suction port under the situation that pump chamber 100 imports, also can stop gas flow through valve system 50, prevent that gas from flowing out to processing division 4 from exhaust port 102.Like this, because the gas when having suppressed to shut down discharges accidentally, therefore, situation about can the elimination system breaking down.

In addition, in this mode of execution, valve system 50 has and can make aperture continually varying structure according to importing pressure.Therefore, can open valve system 50 according to head pressure during entry into service once more at pump-unit 6, and the gas of required flow can be provided to processing division 4 rapidly.

The time that Fig. 5 shows the discharge flow rate of the pump-unit 3 that under experimental condition shown in Figure 6, carries out the running of pump-unit 3 repeatedly and stopping when changing.Among Fig. 6, a is a knock out drum, and b is a pressure meter, and c is for sucking pipe arrangement, and d is a pressurized machine, is equivalent to this mode of execution pump-unit 3.E is a pressure meter, and f is for discharging pipe arrangement, and g is fixing orifice plate, and h is a flowmeter.

As shown in Figure 5, confirm that the minimum value of discharge flow rate is 0, when pump-unit 3 shut down, the gas seal function of valve system 50 ran well.And, confirm that also the discharge flow rate of pump-unit 6 stably maintains certain value, reproducibility is high.

One experimental result of the variation of the rotation numerical control system voltage of being imported in the motor 21 of discharge flow rate with respect to pump-unit 6 of Fig. 7 for expression pump-unit 6 (Vsp).The piping system that is assembled with pump-unit 6 is identical with pipe arrangement example shown in Figure 6.

As shown in Figure 7, after the entry into service of affirmation pump-unit, begin to discharge gas in the moment that reaches appointment rotation number, the rotary driving number of its flow and pump-unit roughly rises pro rata.Like this, utilize this mode of execution can realize the sealing function of gas and stable discharge flow rate control.

Second mode of execution

Fig. 8 shows the pump-unit that second mode of execution of the present invention relates to.Below, mainly to first mode of execution in various structure describe, for said mode of execution in identical structure, enclose identical reference character, and omit or simplify its explanation.

In this mode of execution pump-unit 6, the structure of valve system 60 that is installed on exhaust port 102 is different with said first mode of execution.Valve system 60 has the valve member 61 that constitutes umbrella valve, to be arranged on the internal path of outer cover 62 with Fig. 3 and the identical mode of first mode of execution shown in Figure 4.

The valve system 60 of this mode of execution have restriction more than or equal to expulsion valve 42 cracking pressure (first pressure) and be less than or equal to function that the gas of the gas pressure P1 (second pressure) of pressure source 2 discharges this be identical with first mode of execution on the one hand.Yet the valve system 60 of this mode of execution has when pump-unit 6 shuts down the gas of permission and flows out to processing division 4 from exhaust port 102, and these are different with first mode of execution on the one hand but discharge is suppressed at the function that is less than or equal to specified amount.

That is, the cracking pressure of the valve member 61 of this mode of execution is set at the low pressure of gas pressure P1 in specific pressure source 2.Therefore the valve system 60 of this mode of execution, can control the flow to processing division 4 side effluent airs according to the gas pressure that valve system 60 is imported owing to be to make aperture continually varying structure according to gas pressure.

At this moment, open the big pressure (head pressure (P2) when for example, being less than or equal to pump-unit 3 common runnings) of gas pressure P1 that valve member 61 required pressure are set at specific pressure source 2 fully.Therefore, can be through valve system 60 control more than or equal to the cracking pressure (first pressure) of expulsion valve 42 and be less than or equal to the flow of gas of the gas pressure P1 (second pressure) of pressure source 2.

Adopt this mode of execution, when pump-unit 6 shuts down, can the gas flow that pressure source 2 is provided be compressed to target flow and offer processing division 4.Therefore, need not to establish modulating valve such as orifice plate in addition, can realize reducing the part number of system at the upstream side or the downstream side of pump-unit 6.This mode of execution is applicable to the system that the gas that is less than or equal to target flow also need be provided to processing division 4 when pump-unit 6 shuts down.

The 3rd mode of execution

Fig. 9 shows the pump-unit that the 3rd mode of execution of the present invention relates to.Below, mainly to first mode of execution in various structure describe, for said mode of execution in identical structure, enclose identical reference character, and omit or simplify its explanation.

This mode of execution pump-unit 7 has housing 70, and said housing 70 comprises pump body 11, pump head 71 and pump head lid 73.Pump head 72 places are formed with suction port 101 and exhaust port 102 respectively.Exhaust port 102 places are equipped with the valve system of explaining in first mode of execution 50.

In addition, be formed with suction path T1, drain passageway T2 and knock out drum 721 on the pump head 72 respectively.At least a portion of these paths is exposed to the outside above pump head 72, and covers with pump head lid 73 via sealing component, therefore comes to cut off with atmosphere.

Usually, the pump of diaphragm type produces pulsation at textural discharge gas.When counting according to the rotary driving of the flow measurement value control pump of discharging gas, if pulsation is bigger, then can't measure flow accurately, cause the drive controlling of pump unstable.In addition, when discharge gas is gaseous fuel, may cause combustion instability because of pulsation, it is insufficient perhaps to cause burning.

Therefore, this mode of execution pump-unit 7 has knock out drum 721 between drain passageway T2 and exhaust port 102.Knock out drum 721 forms space portion 74 between expulsion valve 42 (drain passageway T2) and valve system 50, said space portion 74 has enlarged the part of the runner of getting in touch with said expulsion valve 42 and valve system 50.Knock out drum 721 has the function of buffering from the pulsation of the gas of expulsion valve 42 discharges.

Utilize this mode of execution pump-unit 7, can reduce, discharge gas with stable flow rate from the pulsation of the gas of valve system 50 discharges.In addition, according to the driving of discharge flow rate control pump device 7 time, can realize the driving of control pump device 7 stably.Furthermore, pump and knock out drum form as one, and therefore, need not on the gas flow of pumping system, to establish in addition knock out drum, the simplicity of feasible system structure.

The volume of the space portion 74 of knock out drum 721 decides according to the pulsation (pressure range) of the gas of discharging from expulsion valve 42.The experimental result that Figure 10 implements for present inventors, show surge volume (cc) and the pressure range of the gas of discharging from exhaust port 102 between relation.Shown in figure 10, the volume of space portion 74 can dwindle pressure range more greatly more.For example, be more than the 120cc through volume settings with space portion 74, can the pulsation scope be suppressed at below the 0.75kPa.

The 4th mode of execution

Figure 10 shows the pump-unit that the 4th mode of execution of the present invention relates to.Below, mainly to first mode of execution in various structure describe, for said mode of execution in identical structure, enclose identical reference character, and omit or simplify its explanation.

This mode of execution pump-unit 8 has housing 80, drive portion 20 and knock out drum 81.Housing 80 has suction port 101 and exhaust port 102, and the gas that sucks from suction port 101 is carried out supercharging not shown pump chamber, discharges the gas of process supercharging from exhaust port 102 via knock out drum 81.

Figure 11 is the sectional drawing of knock out drum 81 and exhaust port 102.Be formed with the space portion 74 of settable volume in the inside of knock out drum 81, reduce the pulsation of discharging gas.Exhaust port 102 is communicated with space portion 74, and the inside of exhaust port 102 is equipped with valve member 51.Valve member 51 have with first mode of execution in identical structure, have the function of outflow that restriction is less than or equal to the gas of specified pressure.

In this mode of execution of above-mentioned formation, also can obtain and the identical action effect of above-mentioned each mode of execution.Utilize this mode of execution pump-unit 8,, therefore can realize reducing part number owing to be supported on the housing 80 as the valve member 51 of valve system.

Need to prove that Figure 13～Figure 18 shows the outward appearance of pump-unit 8, Figure 13 is a plan view, and Figure 14 is a rear view, and Figure 15 is a planimetric map, and Figure 16 is a worm's eye view, and Figure 17 is a right elevation, and Figure 18 is a left view.

In sum, be illustrated, but the present invention not merely is defined in above-mentioned mode of execution, undoubtedly, in the scope that does not break away from purport of the present invention, can applies various changes to mode of execution of the present invention.

For example, in above mode of execution, the mobile valve system of fluid that restriction is less than or equal to specified pressure is installed on exhaust port, but is not limited thereto, and for example also said valve system can be set on the drain passageway between expulsion valve and the exhaust port.

In addition, the valve member that constitutes said valve system is not limited to umbrella valve, for example also can be made up of spherical valve or fly valve etc.

Furthermore, in above mode of execution, pump-unit is made up of diaphragm pump, but is not limited thereto, and the present invention is also applicable to other pump-units such as Roots pumps.Under the situation of Roots pump,, corresponding with the rotor of relative configuration as the movable link of the volume-variation that makes pump chamber.

Claims

1. a pump-unit is characterized in that, comprising:

Housing, the pump chamber that has suction port, exhaust port and be communicated with said suction port and said exhaust port respectively;

Movable link can move in the inside of said housing, carries out alternately sucking fluid and discharging fluid from said pump chamber to said pump chamber;

First valve is installed between said suction port and the said pump chamber, allows said fluid to flow to said pump chamber from said suction port;

Second valve is installed between said pump chamber and the said exhaust port, during more than or equal to first pressure, allows said fluid to flow to said exhaust port from said pump chamber at the fluid of said pump chamber;

The 3rd valve is installed on the said housing, and the said fluid between said suction port and said exhaust port limits said fluid and flows to said exhaust port from said suction port greater than said first pressure and when being less than or equal to second pressure.

2. require 1 described pump-unit according to profit, it is characterized in that, said the 3rd valve is disposed at than said second valve more near the position of discharging oral-lateral.

3. pump-unit according to claim 2 is characterized in that, said the 3rd valve comprises: according to more than or equal to said first pressure and be less than or equal to the pressure of said second pressure, the valve member that aperture changes continuously.

4. pump-unit according to claim 3 is characterized in that, said valve member is a umbrella valve.

5. pump-unit according to claim 2 is characterized in that, said housing further comprises by the part of the stream of said second valve of contact and said the 3rd valve expands the space portion that forms.

6. pump-unit according to claim 1 is characterized in that, said movable link comprises: the deformable membrane of dividing said pump chamber.

7. a pumping system is characterized in that, comprising:

Pump-unit;

Pressure source is connected in said suction port, and the fluid that is less than or equal to said second pressure is provided to said pump-unit;

Processing division is connected in said exhaust port, handles the fluid of discharging from said pump-unit;

Said pump-unit comprises: housing has exhaust port of getting in touch with the suction port of said pressure source contact, with said processing division and the pump chamber that is communicated with said suction port and said exhaust port respectively; Movable link can move in the inside of said housing, carries out alternately sucking fluid and discharging fluid from said pump chamber to said pump chamber; First valve is installed between said suction port and the said pump chamber, allows said fluid to flow to said pump chamber from said suction port; Second valve is installed between said pump chamber and the said exhaust port, allows to flow to said exhaust port from said pump chamber more than or equal to the said fluid of first pressure; The 3rd valve is installed on the said housing, and restriction is flowed to said exhaust port from said suction port greater than said first pressure and the said fluid that is less than or equal to second pressure.

8. pumping system according to claim 7 is characterized in that, said the 3rd valve comprises: the valve member that flows that cuts off the said fluid that is less than or equal to said second pressure.

9. pumping system according to claim 7 is characterized in that, said the 3rd valve comprises: according to more than or equal to said first pressure and be less than or equal to the pressure of said second pressure, the valve member that aperture changes continuously.