CN208605318U - A kind of precision plunger pump - Google Patents
A kind of precision plunger pump Download PDFInfo
- Publication number
- CN208605318U CN208605318U CN201820857860.0U CN201820857860U CN208605318U CN 208605318 U CN208605318 U CN 208605318U CN 201820857860 U CN201820857860 U CN 201820857860U CN 208605318 U CN208605318 U CN 208605318U
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- Prior art keywords
- piston
- sealing ring
- stepping motor
- pump
- linear stepping
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Abstract
The utility model discloses a kind of precision plunger pumps, it is made of stretching shaft type linear stepping motor, piston, the pump housing, seal assembly, position sensing component, stretches out the straight reciprocating motion needed for opposing seal component slippage, realization plunger pump in the pump housing of shaft type linear stepping motor driving piston.Piston and the projecting shaft for stretching out shaft type linear stepping motor are connected or directly connect with the feed screw nut for stretching out shaft type linear stepping motor, motor projecting shaft has a hollow or blind hole or piston to have a blind hole, when piston move under the driving for stretching out shaft type linear stepping motor to linear stepping motor internal direction, lead screw can enter the hollow or blind hole region of motor projecting shaft or piston across nut, to save the length of linear stepping motor axial direction, so as to shorten the length of precision plunger pump.Precision plunger pump can use different seal component architectures and position sensing component.The utility model structure is simple, cost is relatively low, compact dimensions.
Description
Technical field
It can be used for Life Science Instruments, extracorporeal diagnostic instrument and field of analytic instrument the present invention relates to one kind and be used to accurate behaviour
Make the precision plunger pump of micro liquid.
Background technique
In Life Science Instruments, in-vitro diagnosis equipment and field of analytic instrument, have many instruments need accurately to obtain it is micro-
Quantity of fluid (including sample and reagent), liquid volume is from several microlitres to several milliliters.There are many pumps can satisfy the different behaviour of precision
Make, be such as suitable for the general peristaltic pump of continuous feed liquid, precision, is suitable for setting the diaphragm pump and expanded letter of volume of liquid operation
Product range, highly accurate micro-injection pump or precision plunger pump.
Syringe pump is made of stepper motor, linear reciprocation drive mechanism, bracket and syringe etc., and common linear reciprocation passes
Dynamic structure is the transmission of lead screw and feed screw nut composition.Feed screw nut is connected with the piston of syringe, and liquid is held in syringe
Body realizes the liquid transmission of high-precision, steady pulse free.The Carvo injection series pump of Tecan company exploitation is answered in above-mentioned field
With very extensive.Syringe is replaceable, or even is replaced by the syringe of different volumes, is convenient for research project.This pump
Common issue is the restricted lifetime of syringe, needs to regularly replace syringe；And it is led since syringe is generally used lead screw
Structure, the cost of rail are more expensive.
The integrated level of precision plunger pump is higher, and the structure for playing syringe pump chamber and piston function or component are integrated into
In the pump housing.Advantage is that pump housing volume is substantially reduced, and the piston seal cooperation service life greatly improves, the disadvantage is that the capacity of pump is fixed.But
It is for the instrument product of batch production, the capacity requirement of each pump is fixed.Sapphire company, the U.S. and the U.S.
LEE Company company all produces this precision plunger pump.The transmission mechanism of these pumps is all by a stepper motor and stepping
Lead screw, a feed screw nut and its guiding parts that motor shaft is connected, piston, a pump chamber and close being fixed on nut
Seal composition.The shortcomings that this structure is that assembling process is cumbersome, and the size of the pump housing is larger.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of new precision plunger pump, mainly use improvement structure with
Simplify and installs and make full use of space to reduce the size of pump.
Purpose is appealed to realize, the invention adopts the following technical scheme:
On the basis of precision plunger pumps existing general technology scheme, directlys adopt and stretch out shaft type linear stepping motor realization column
Straight reciprocating motion needed for plug pump, precision plunger are pumped by stretching shaft type linear stepping motor, piston, the pump housing, seal assembly, position
Set sensory package composition.The stretching shaft end for stretching out shaft type linear stepping motor can not support.
Stretch out motor projecting shaft, straight line that shaft type linear stepping motor is connected by stepper motor, lead screw, nut and nut
Guide frame composition, the axis of stepper motor are connected with lead screw, and lead screw and nut form transmission, and stepper motor drives when rotating
The nut of lead screw rotation and lead screw cooperation transmission moves along a straight line under straight-line guidance structure directing along lead screw length direction, and
The connected motor projecting shaft of nut, which is realized from stretching out inside shaft type linear stepping motor, to be stretched out or retracts.
The feed screw nut or nut mentioned in this specification all refer to the feed screw nut with lead screw cooperation transmission.
Precision plunger pump the connection relationship of each component include: (1) by stretch out shaft type linear stepping motor projecting shaft or
Feed screw nut and piston are connected directly to form linear motion shafting.(2) piston by being connected with motor projecting shaft or feed screw nut
The seal assembly matched supports the linear motion shafting.(3) projecting shaft of the linear stepping motor is made into hollow
Or in axial processing blind hole, in this way when the projecting shaft is shunk back inside the linear stepping motor, lead screw can wear
It crosses nut and enters the blind hole or hollow region of projecting shaft, so that the axial length of linear stepping motor is saved, so as to shorten essence
The length of close plunger pump.It (4), can be processing blind hole in the axial direction of piston and and straight line stepping in order to further shorten size
The nut of motor is directly connected to, when piston is moved to linear stepping motor internal direction, lead screw can pass through nut enter work
The blind hole region of plug, so as to shorten the length of precision plunger pump.(5) there are seal assembly, sealing group in the pump chamber of pump body
Part is made of seal ring assembly and compact heap, and seal ring assembly pushes down sealing with compact heap on the stepped hole in pump chamber
Coil assembly realizes the sealing of seal assembly and pump chamber, seal assembly and piston space；Seal ring assembly can be by sealing ring and attached
Sealing ring composition, secondary sealant circle between sealing ring and pump chamber, for realizing the sealing between sealing ring and pump chamber, sealing ring
For realizing the sealing between sealing ring and piston；Seal ring assembly can also only have sealing ring, and realize simultaneously sealing ring and
The sealing of sealing, sealing ring and piston space between pump chamber, so that when each outlet of pump chamber blocks, between pump chamber and piston
Space formed an airtight cavity.(6) position sensing component can be optoelectronic switch and photoelectricity gear shaft, and optoelectronic switch is mounted on
Perhaps photoelectricity gear shaft is mounted on the projecting shaft or piston of linear stepping motor the pump housing on linear stepping motor；Position sensing
Combination is also possible to Hall switch or position coder, is mounted on linear stepping motor；Position sensor combination can also be with
It is travel switch, is mounted on the pump housing or linear stepping motor, and is installed on the projecting shaft or piston of linear stepping motor
Travel switch touches part.(7) projecting shaft of linear stepping motor drives piston opposing seal component slippage, the straight line in pump chamber
Movement, generates positive pressure when piston moves along a straight line along and into pump housing direction, in pump chamber, piston is transported along pump housing direction straight line is left
Negative pressure is generated when dynamic, in pump chamber.(8) the one or more hole being connected to pump chamber is provided on the pump housing.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The drawings and examples of offer obtain the other embodiments of the present invention.
Fig. 1 is the overall structure diagram of the pump of precision plunger provided by one embodiment of the invention；
Fig. 2 is the overall structure diagram of the pump of precision plunger provided by another embodiment of the present invention；
Fig. 3 A, 3B are a kind of structural schematic diagram of seal assembly provided by the embodiment of the present invention, and Fig. 3 C, 3D and 3E are this
The structural schematic diagram of other three kinds of seal assemblies provided by inventive embodiments.
Wherein, appended drawing reference is that 1- stretches out shaft type linear stepping motor, the lead screw of 11- linear stepping motor, 12- straight line step
Into the straight-line guidance structure of motor, the feed screw nut of 13- linear stepping motor, the projecting shaft of 14- linear stepping motor, 2- photoelectricity
Switch, the 3- pump housing, 4- piston, 5- secondary sealant circle, 6- sealing ring, 7- compact heap, 8- photoelectricity gear shaft.
Specific embodiment
There is provided a kind of new precision plunger pumps for core of the invention, mainly use improvement structure with simplified installation, simultaneously
Space is made full use of to reduce the size of pump.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Straight reciprocating motion needed for the present invention realizes plunger pump using the stretching shaft type linear stepping motor 1.It is described
Shaft type linear stepping motor 1 is stretched out by stepper motor, lead screw 11, straight-line guidance structure 12, nut 13 and the electricity being connected with nut
Machine projecting shaft 14 forms, and the axis of the stepper motor and the lead screw 11 connect, the lead screw 11 and the formation of the nut 13
Transmission, the stepper motor drive the nut 13 that the lead screw 11 rotates and the cooperation of the lead screw 11 is driven when rotating
The institute being connected downward along 11 length direction of lead screw linear motion with the nut 13 is led in the straight-line guidance structure 12
It states motor projecting shaft 14 and realizes and stretch out or retract inside the stretching shaft type linear stepping motor 1.The stretching shaft type is straight
It the stretching shaft end of line stepper motor 1 can be without support to support the motor projecting shaft 14.
Shown in FIG. 1 is one embodiment of the present of invention, and precision plunger is pumped by stretching shaft type linear stepping motor 1, the pump housing
3, piston 4, seal assembly (including secondary sealant circle 5, sealing ring 6 and compact heap 7), position sensing component (including optoelectronic switch 2
With photoelectricity gear shaft 8) composition.The connection relationship of each component includes: that the motor for stretching out shaft type linear stepping motor 1 stretches out
Axis 14 and the piston 4 are connected to form linear motion shafting；The stretching shaft type linear stepping motor 1 is connected with the pump housing 3,
The pump body has pump chamber；It is described stretch out shaft type linear stepping motor 1 stretching shaft end can not support, by with the work
The sealing ring 6 of 4 seal assemblies matching, being installed in the pump chamber is filled in support the linear motion axis
System.
The seal assembly is made of seal ring assembly and compact heap 7, seal ring assembly pump in the pump housing 3
On the stepped hole of chamber, and the seal ring assembly is pushed down with the compact heap 7；The seal ring assembly can be by secondary sealant circle
5 and sealing ring 6 form, the secondary sealant snare 5 is between the sealing ring and the pump chamber, the secondary sealant circle 5
For realizing the sealing between the sealing ring 6 and the pump chamber, the sealing ring 6 be used to realize sealing ring 6 and the piston 4 it
Between sealing；The seal assembly is mounted in the pump chamber, between the pump chamber and the piston 4, so that the pump
Space when each outlet of chamber blocks, between the pump chamber and the piston 4 forms an airtight cavity, the piston
4 it is described stretch out shaft type linear stepping motor 1 driving under along and into 3 direction of the pump housing move along a straight line when, the pump chamber
Interior generation positive pressure, the piston 4 generate negative pressure along when leaving 3 direction of pump housing linear motion, in the pump chamber.
The motor projecting shaft 14 for stretching out shaft type linear stepping motor 1 is hollow or has in the axial direction
One blind hole, so that the linear motion shafting has a blind hole；In this way when the motor projecting shaft 14 shrinks back the stretching
When shaft type 1 inside of linear stepping motor, the lead screw 11 can pass through the nut 13 enter it is described linear motion shafting it is blind
Bore region, so that the axial length of the stretching shaft type linear stepping motor 1 is saved, so as to shorten the length of precision plunger pump.
Further, the motor projecting shaft 14 is that the hollow and described piston 4 has a blind hole in the axial direction,
So that the linear motion shafting has a blind hole；In this way when the motor projecting shaft 14 shrinks back the stretching shaft type straight line step
When into 1 inside of motor, the lead screw 11 can pass through the blind hole region that the nut 13 enters the linear motion shafting, thus
The axial length of the stretching shaft type linear stepping motor 1 is saved, so as to shorten the length of precision plunger pump.
The position sensing component is made of optoelectronic switch 2 and photoelectricity gear shaft 8, and the optoelectronic switch 2 is mounted on the pump
On body 3 or the stretching shaft type linear stepping motor 1, the photoelectricity gear shaft 8 is mounted on the stretching shaft type straight line stepping electricity
The nut 13 of machine 1, the projecting shaft 14 or the piston 4 on.When the photoelectricity gear shaft 8 blocks or leave institute
When stating the sensor devices of optoelectronic switch 2, the output level of the optoelectronic switch 2 changes.
The one or more hole being connected to pump chamber is provided on the pump housing 3.
Shown in Fig. 2 is another embodiment of the invention, and precision plunger pump is by stretching shaft type linear stepping motor 1, pump
(including photoelectricity is opened for body 3, piston 4, seal assembly (including secondary sealant circle 5, sealing ring 6 and compact heap 7), position sensing component
Close 2 and photoelectricity gear shaft 8) composition.The connection relationship of each component includes: the lead screw for stretching out shaft type linear stepping motor 1
Nut 13 and the piston 4 are connected directly and to form linear motion shafting, are used as the stretching shaft type straight line stepping by the piston 4
The projecting shaft of motor；The stretching shaft type linear stepping motor 1 is connected with the pump housing 3, and the pump body has pump chamber；It is described
The stretching shaft end for stretching out shaft type linear stepping motor 1 can not support, by it is being matched with the piston 4, be installed on it is described
The sealing ring 6 of the seal assembly in pump chamber supports the linear motion shafting.
The seal assembly is made of seal ring assembly and compact heap 7, seal ring assembly pump in the pump housing 3
On the stepped hole of chamber, and the seal ring assembly is pushed down with the compact heap 7；The seal ring assembly can be by secondary sealant circle
5 and sealing ring 6 form, the secondary sealant snare 5 is between the sealing ring 6 and the pump chamber, the secondary sealant circle 5
For realizing the sealing between the sealing ring 6 and the pump chamber of the pump housing 3, the sealing ring 6 is used to realize sealing ring 6 and described
Sealing between piston 4；The seal assembly is mounted in the pump chamber, between the pump chamber and the piston 4, so that
Space when each outlet of the pump chamber blocks, between the pump chamber and the piston 4 forms an airtight cavity, institute
State piston 4 it is described stretch out shaft type linear stepping motor 1 driving under along and into 3 direction of the pump housing move along a straight line when, institute
It states and generates positive pressure in pump chamber, the piston 4 generates negative pressure along when leaving 3 direction of pump housing linear motion, in the pump chamber.
The piston 4 has a blind hole in the axial direction, electric to the stretching shaft type straight line stepping when the piston 4 in this way
When 1 internal contraction of machine, the lead screw 11 can pass through the nut 13 enter the piston 4 the blind hole region, to save
It is about described to stretch out the axial length of shaft type linear stepping motor 1, so as to shorten the length of precision plunger pump.
The position sensing component is made of optoelectronic switch 2 and photoelectricity gear shaft 8, and the optoelectronic switch 2 is mounted on the pump
On body 3 or the stretching shaft type linear stepping motor 1, the photoelectricity gear shaft 8 is mounted on the stretching shaft type straight line stepping electricity
The projecting shaft 14 of machine 1 or the piston 4 on.When the photoelectricity gear shaft 8 blocks or leave the optoelectronic switch 2
Sensor devices when, the output level of the optoelectronic switch 2 changes.
The one or more hole being connected to the pump chamber is provided on the pump housing 3.
Two embodiment of the present invention and the other embodiment of the present invention shown in Fig. 1 and Fig. 2 can use different sealing groups
Part structure and position sensing component, form more embodiments.
Fig. 3 A and Fig. 3 B are a kind of structural schematic diagram of seal assembly provided by the embodiment of the present invention.The seal assembly
It is made of seal ring assembly and compact heap 7, seal ring assembly is in the pump housing 3 on the stepped hole of pump chamber, and with the compact heap 7
Push down seal ring assembly；The seal ring assembly can be made of secondary sealant circle 5 and sealing ring 6, and the secondary sealant circle 5 can
To be section for circular O-ring, the sealing ring 6 is a hollow T-shaped structure, the sealing ring 6 and described attached
Belong to the connected periphery part of sealing ring 5 and inner headed face is all cylindrical surface, the secondary sealant snare 5 is in the sealing ring 6
On periphery.The secondary sealant circle 5 can be one, as shown in Figure 3A；The secondary sealant circle 5 can be two or two
More than, as shown in Figure 3B.
Fig. 3 C is the structural schematic diagram of another seal assembly provided by the embodiment of the present invention.The seal assembly by
Seal ring assembly and compact heap 7 form, and seal ring assembly is pressed on the stepped hole of pump chamber in the pump housing 3, and with the compact heap 7
Firmly seal ring assembly；The seal ring assembly can be made of secondary sealant circle 5 and sealing ring 6, and the secondary sealant circle 5 can be with
Be section be circular O-ring, the sealing ring 6 is a hollow T-shaped structure, and the inner headed face of the sealing ring 6 is round
Cylinder, there are one or more grooves in the periphery part that the sealing ring 6 is connected with the secondary sealant circle 5, described attached
Belong to sealing ring 5 to be located in the groove, the groove section can be rectangle, semi circular surface or arc surface.The secondary sealant
Circle 5 can be one, and the secondary sealant circle 5 is also possible to two or more.
Fig. 3 D is the structural schematic diagram of another seal assembly provided by the embodiment of the present invention.The seal assembly by
Seal ring assembly and compact heap 7 form, and seal ring assembly is pressed on the stepped hole of pump chamber in the pump housing 3, and with the compact heap 7
Firmly seal ring assembly；The seal ring assembly can be made of secondary sealant circle 5 and sealing ring 6, and the secondary sealant circle 5 can be with
Be section be circular O-ring, the sealing ring 6 is a cirque structure, and the inner headed face of the sealing ring 6 is cylindrical surface,
There are one or more grooves, the secondary sealant in the periphery part that the sealing ring 6 is connected with the secondary sealant circle 5
Circle 5 is located in the groove, and the groove section can be rectangle, semi circular surface or arc surface.The secondary sealant circle 5 can be with
It is one, the secondary sealant circle 5 is also possible to two or more.
Fig. 3 E is the structural schematic diagram of another seal assembly provided by the embodiment of the present invention.The seal assembly by
Seal ring assembly and compact heap 7 form, and seal ring assembly is pushed down with the compact heap 7 close on the stepped hole in the pump housing 3
Ring assemblies；Seal ring assembly, that is, the sealing ring 6, the section of the sealing ring 6 can be rectangle, I-shaped or other shapes
Shape is realized between sealing, the sealing ring 6 and the piston 4 between the sealing ring 6 and the pump chamber of the pump housing 3
Sealing；The sealing ring 6 can be one or more.
In other embodiment of the present invention, the secondary sealant circle 5 is between the sealing ring 6 and the pump chamber,
The secondary sealant circle 5 is located in the plane for the stepped hole in the pump chamber being used to place the seal assembly, can also be located at
In groove in the plane of the stepped hole.
In different embodiments of the invention, same or different position sensing component can be used.The position sensing
Component can be optoelectronic switch 2 and photoelectricity gear shaft 8, and the optoelectronic switch 2 is mounted on the pump housing 3 or the stretching shaft type is straight
On line stepper motor 1, the photoelectricity gear shaft 8 is mounted on the nut 13, the electricity for stretching out shaft type linear stepping motor 1
On machine projecting shaft 14 or the piston 4；When the photoelectricity gear shaft 8 blocks or leave the sensor devices of the optoelectronic switch 2
When, the output level of the optoelectronic switch 2 changes.The position sensing component is also possible to Hall switch or position is compiled
Code device, the Hall switch or position coder are installed on the stepper motor for stretching out shaft type linear stepping motor 1；It is described
Position sensing component is also possible to travel switch, and the travel switch is mounted on the pump housing 3 or the stretching shaft type straight line
On stepper motor 1, and the nut 13 in the stretching shaft type linear stepping motor 1, the motor projecting shaft 14 or described
The touch part of the installation travel switch on piston 4.
In different embodiments of the invention, the one or more hole being connected to pump chamber is provided on the pump housing 3.Its
In have a hole axis and the piston 4 axis direction it is parallel or be overlapped or with the axis of the piston 4 at certain
Angle, the angle may be greater than 0 degree of some degree being less than in 180 degree.
In different embodiments of the invention, the sealing ring 6 uses wear-resistant material, preferred, polyethers ether ketone (PEEK), poly- four
Vinyl fluoride (PTFE), polyurethane, fluorine-containing rubber or silastic material.
In different embodiments of the invention, the piston 4 uses wear-resisting, high-strength material, preferably ceramic or metal material
Material.
In different embodiments of the invention, the material of the pump housing 3 uses metal or nonmetallic materials, preferred, polyethers ether
Ketone, organic glass, polyformaldehyde, polymethyl methacrylate, polycarbonate or stainless steel material.
In different embodiments of the invention, formed between the periphery of the piston 4 and the inner headed face of the sealing ring 6 close
Envelope cooperation, the cooperation can be clearance fit, zero clearance cooperation or interference fit.
The present invention uses in the embodiment of rubber or polyurethane material as 6 material of sealing ring, 4 outer circle of piston
Cylindrical surface diameter compares equal or bigger, the 4 outer circle cylindrical surface diameter of piston with the inner circle cylindrical surface diameter of the sealing ring 6
The difference for subtracting the inner circle cylindrical surface diameter of the sealing ring 6 can be 0 ~ 1mm, preferably 0 ~ 0.2mm.
The present invention uses in embodiment of the polyetheretherketonematerials materials as 6 material of sealing ring, the 4 outer circle cylinder of piston
Face diameter is compared smaller, equal or bigger with the inner circle cylindrical surface diameter of the sealing ring 6, and the difference in diameter can be-
0.05 ~ 0.1mm, preferably 0 ~ 0.08mm.
Claims (11)
1. a kind of precision plunger pump, it is characterised in that:
The precision plunger pump is by stretching shaft type linear stepping motor, piston, the pump housing, seal assembly and position sensing component group
At；Motor projecting shaft, the straight line that the stretching shaft type linear stepping motor is connected by stepper motor, lead screw, nut and nut are led
To structure composition；The motor projecting shaft for stretching out shaft type linear stepping motor and the piston are connected to form linear motion axis
System；The stretching shaft type linear stepping motor is connected with the pump housing, and the pump body has pump chamber；The seal assembly includes
Sealing ring；The stretching shaft end for stretching out shaft type linear stepping motor can not support, by match with the piston, peace
The sealing ring loaded on the seal assembly in the pump chamber supports the linear motion shafting；The stretching shaft type is straight
The motor projecting shaft of line stepper motor is that the hollow or described motor projecting shaft has a blind hole in the axial direction, or
Motor projecting shaft described in person is that the hollow and described piston has a blind hole in the axial direction, so that the linear motion axis
There is a blind hole in system；When the motor projecting shaft is shunk back inside the stretching shaft type linear stepping motor, the lead screw can
To pass through the blind hole region that the nut enters the linear motion shafting.
2. a kind of precision plunger pump, it is characterised in that:
The precision plunger pump is made of stretching shaft type linear stepping motor, piston, the pump housing, seal assembly, position sensing component；
The feed screw nut for stretching out shaft type linear stepping motor and the piston are connected directly to form linear motion shafting, by the work
It fills in as the projecting shaft for stretching out shaft type linear stepping motor；The stretching shaft type linear stepping motor and the pump housing phase
Even, the pump body has pump chamber；The seal assembly includes sealing ring；The projecting shaft for stretching out shaft type linear stepping motor
End can not support, by the sealing of the seal assembly matching with the piston, being installed in the pump chamber
Circle is to support the linear motion shafting；The piston has a blind hole in the axial direction, in this way when the piston is stretched to described
When shaft-protruding type linear stepping motor internal contraction, the lead screw can pass through the nut enter the piston the blind hole area
Domain.
3. precision plunger pump according to claim 1 or claim 2, it is characterised in that:
There is the seal assembly in the intracorporal pump chamber of pump, the seal assembly is by seal ring assembly and compact heap group
At the seal ring assembly pushes down the seal ring assembly with the compact heap on the stepped hole in the pump chamber, real
The sealing of the existing seal assembly and the pump chamber, the seal assembly and piston space, so that each outlet of the pump chamber is stifled
Space when upper, between the pump chamber and the piston forms an airtight cavity；The piston is in the stretching shaft type
Positive pressure, the work are generated when moving along a straight line under the driving of linear stepping motor along and into the pump housing direction, in the pump chamber
Plug generates negative pressure along when leaving pump housing direction linear motion, in the pump chamber.
4. precision plunger pumps according to claim 3, it is characterised in that:
The seal ring assembly can be made of sealing ring and secondary sealant circle, step of the seal ring assembly in pump chamber
Kong Shang, and the seal ring assembly is pushed down with the compact heap；The secondary sealant circle is located at the sealing ring and the pump chamber
Between, the secondary sealant circle is used to realize the sealing between the sealing ring and the pump chamber, and the sealing ring is used to realize institute
State the sealing between sealing ring and the piston.
5. precision plunger pumps according to claim 3, it is characterised in that:
The seal ring assembly is sealing ring, is pushed down on the stepped hole in pump chamber, and with the compact heap, realization and institute
State the sealing of sealing between sealing ring and the pump chamber, the sealing ring and the piston space；The section of the sealing ring can be with
It is rectangle or I-shaped.
6. precision plunger pumps according to claim 4, it is characterised in that:
The sealing ring is a hollow T-shaped structure, the periphery of the sealing ring being connected with the secondary sealant circle
Part and inner headed face are all cylindrical surfaces, and the secondary sealant snare is on the periphery of the sealing ring；The secondary sealant circle
It can be one or more.
7. precision plunger pumps according to claim 4, it is characterised in that:
The sealing ring is a hollow T-shaped structure, and the inner headed face of the sealing ring is cylindrical surface, the sealing ring and institute
Stating the connected periphery part of secondary sealant circle has one or more grooves, and the secondary sealant circle is located at the groove
Interior, the groove section can be rectangle, semi circular surface or arc surface；The secondary sealant circle can be one or one with
On.
8. precision plunger pumps according to claim 4, it is characterised in that:
The sealing ring is a cirque structure, and the inner headed face of the sealing ring is cylindrical surface, the sealing ring and described attached
Belonging to the connected periphery part of sealing ring has one or more grooves, and the secondary sealant circle is located in the groove, institute
Stating groove section can be rectangle, semi circular surface or arc surface；The secondary sealant circle can be one or more.
9. precision plunger pumps according to claim 4, it is characterised in that:
The secondary sealant circle is located in the plane for the stepped hole in the pump chamber being used to place the seal assembly, can also position
In in the groove in the plane of the stepped hole.
10. precision plunger pump according to claim 1 or claim 2, it is characterised in that:
The material of the sealing ring of the seal assembly be rubber or polyurethane, outside piston cylindrical surface diameter with it is described
For the inner circle cylindrical surface diameter of sealing ring compared to equal or bigger, outside piston cylindrical surface diameter subtracts the interior of the sealing ring
The difference of round cylinder diameter can be 0~1mm.
11. precision plunger pump according to claim 1 or claim 2, it is characterised in that:
The material of the sealing ring of the seal assembly is polyether-ether-ketone, outside piston cylindrical surface diameter and the sealing
For the inner circle cylindrical surface diameter of circle compared to smaller, equal or bigger, outside piston cylindrical surface diameter subtracts the sealing ring
The difference of inner circle cylindrical surface diameter can be -0.05~0.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820857860.0U CN208605318U (en) | 2018-06-05 | 2018-06-05 | A kind of precision plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820857860.0U CN208605318U (en) | 2018-06-05 | 2018-06-05 | A kind of precision plunger pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208605318U true CN208605318U (en) | 2019-03-15 |
Family
ID=65662439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820857860.0U Expired - Fee Related CN208605318U (en) | 2018-06-05 | 2018-06-05 | A kind of precision plunger pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208605318U (en) |
-
2018
- 2018-06-05 CN CN201820857860.0U patent/CN208605318U/en not_active Expired - Fee Related
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