CN104314804A - Plunger pump and application thereof - Google Patents

Plunger pump and application thereof Download PDF

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Publication number
CN104314804A
CN104314804A CN201410501247.1A CN201410501247A CN104314804A CN 104314804 A CN104314804 A CN 104314804A CN 201410501247 A CN201410501247 A CN 201410501247A CN 104314804 A CN104314804 A CN 104314804A
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CN
China
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described
plunger
pump
comprises
pump housing
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CN201410501247.1A
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Chinese (zh)
Inventor
周林
童毅
樊坚强
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天纳克(苏州)排放系统有限公司
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Priority to CN201410501247.1A priority Critical patent/CN104314804A/en
Publication of CN104314804A publication Critical patent/CN104314804A/en

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Abstract

The invention discloses a plunger pump and an application thereof. The plunger pump comprises a pump body and a magnetic coil; the pump body comprises a first pump body and a second pump body which jointly form a fluid channel; the fluid channel is provided with an inlet valve, an outlet valve and a pump cavity; the fluid channel comprises a second channel, a main spring and a plunger abutted against the main spring; the inlet valve is positioned at the front end of the plunger; the plunger can reciprocate under the actions of the magnetic coil and the main spring; the plunger comprises a third channel penetrating front and back and communicated with the second channel; the inlet valve comprises a first valve holder, a first valve core and a first spring abutted against the first valve core; the inlet valve is integrally inserted into the third channel. The plunger pump is connected with a urea tank and a nozzle in a urea jet system so as to jet urea solution in the urea tank to the nozzle.

Description

Plunger pump and application thereof

Technical field

The present invention relates to a kind of pump, particularly relate to a kind of plunger pump that can be applied in exhaust treatment system.

Background technique

Plunger pump of the prior art generally includes the pump housing, the plunger be installed in the described pump housing, the Returnning spring coordinated with described plunger and be positioned at the magnetic coil of described pump housing periphery.Be provided with fluid passage in the described pump housing and be positioned at the one-way valve of described fluid passage.Described one-way valve generally includes inlet valve and outlet valve.When described magnetic coil energising, the electromagnetic force of generation can drive plunger be moved, meanwhile, the inlet valve of plunger pump is opened, and outlet valve cuts out, and forms vacuum sealing space, in the process, the fluid (such as, urea liquid) of unit quantity is pressed into pump chamber by external atmospheric pressure; When described magnetic coil power-off, described plunger gets back to initial position under the effect of described Returnning spring, and plunger is by the fluid expulsion of unit quantity in the process, and then completes the circulation of a pumping dosed fluid.

Described one-way valve comprises valve seat, spool and spring.During assembling, usually need these parts to be assembled in described plunger pump one by one, assembling inconvenience.

Therefore, be necessary to improve existing plunger pump.

Summary of the invention

The object of the present invention is to provide a kind of plunger pump easy to assembly and the application of this plunger pump in urea injection system.

For achieving the above object, the present invention adopts following technological scheme: a kind of plunger pump, and it comprises the pump housing and is positioned at the magnetic coil of described pump housing periphery, second pump housing that the described pump housing comprises first pump housing and matches with described first pump housing, described first pump housing comprises Exported Cone portion and the first assembly department, described second pump housing comprises into mouth tube portion and the second assembly department of matching with described first assembly department, described first pump housing and described second pump housing form a fluid passage jointly, described fluid passage is provided with inlet valve, outlet valve and the pump chamber between described inlet valve and described outlet valve, described fluid passage comprise be arranged at described in enter second channel in mouth tube portion, describedly enter main spring to be also installed and to be held in the plunger of described main spring in mouth tube portion, described inlet valve is positioned at the front end of described plunger, described plunger can to-and-fro motion under the effect of described magnetic coil and described main spring, described plunger comprises pre-and post perforative third channel, described third channel is connected with described second channel, described inlet valve comprises the first valve seat, the first spool and abuts the first spring of described first spool, and described inlet valve is inserted in described third channel by entirety.

As further improved technical scheme of the present invention, described plunger pump comprises the housing assembly being socketed on described plunger front end, described outlet valve comprises the second valve seat, the second spool and abuts the second spring of described second spool, and described outlet valve is inserted into the front end of described housing assembly by entirety.

As further improved technical scheme of the present invention, described housing assembly comprises cylinder body and is installed on the stuffing box gland on described cylinder body, described cylinder body comprises abutting part, runs through the receiving groove of described abutting part and described accommodation section from the accommodating part that described abutting part extends forward and front and back, and described outlet valve is inserted in described receiving groove.

As further improved technical scheme of the present invention, described plunger pump also comprises the bounding means being positioned at described second channel, and described bounding means can in the position of the movement backward of plunger described in described magnetic coil energising limit.

As further improved technical scheme of the present invention, described bounding means and described second pump housing are provided separately, and then fit together; Or

Described bounding means and described second pump housing one-body molded.

As further improved technical scheme of the present invention, described main spring is socketed on described bounding means; When described magnetic coil is not energized, described bounding means extends at least forward the middle part of described main spring.

As further improved technical scheme of the present invention, the barrel of described bounding means is also provided with the perforate be communicated with described second channel.

As further improved technical scheme of the present invention, described first assembly department comprises assembly wall, described assembly wall be provided with the first fluting, circumferentially slot with described first and be communicated with second slot and to slot the first guide slot run through backward from described second; Described second assembly department is provided with the first projection, described first projection is slotted through described first guide slot and second successively when assembling, and then circumferentially being screwed in described first fluting, described first fluting width is along the longitudinal direction greater than described second fluting width along the longitudinal direction.

As further improved technical scheme of the present invention, described plunger pump comprises the support being positioned at described magnetic coil periphery, described support comprises front bulkhead, aft bulkhead and connects the two side of described front bulkhead and described aft bulkhead, the described pump housing by screw tightening on described support; Described magnetic coil is provided with pre-and post perforative through hole, described plunger pump is also provided with the sleeve member be installed in described through hole, the described pump housing is through described sleeve member, the second sleeve member that described sleeve member comprises first set barrier part, compress mutually with described first set barrier part and the 3rd sleeve member compressed mutually with described second sleeve member, described first set barrier part and described 3rd sleeve member are made up of metallic material, and described second sleeve member is made of plastics.

Present invention further teaches the application of a kind of plunger pump in urea injection system, described urea injection system is in order to process motor exhaust, described urea injection system comprises urea tank and nozzle, described plunger pump is connected between described urea tank and described nozzle, described plunger pump in order to by the urea solution pump in urea tank to described nozzle, described plunger pump is the plunger pump with aforementioned structure.

Compared to prior art, described inlet valve of the present invention is inserted in described third channel by entirety, easy to assembly, also simplify the design difficulty of other dependency structures of plunger pump simultaneously.

Accompanying drawing explanation

Fig. 1 is the schematic diagram be applied to by plunger pump of the present invention in exhaust treatment system.

Fig. 2 is the stereogram of plunger pump of the present invention.

Fig. 3 is the stereogram of another angle of Fig. 2.

Fig. 4 is the part isometric exploded view of plunger pump of the present invention.

Fig. 5 is the part isometric exploded view of Fig. 4 middle pump body.

Fig. 6 is the part isometric exploded view of another angle of Fig. 5.

Fig. 7 is the three-dimensional exploded view of first pump housing in Fig. 5.

Fig. 8 is the three-dimensional exploded view of housing assembly in Fig. 5.

Fig. 9 is the three-dimensional exploded view of plunger in Fig. 5, main spring and second pump housing etc.

Figure 10 is the sectional drawing that plunger pump of the present invention removes after inner body.

Figure 11 is the sectional drawing that plunger pump of the present invention is provided with inner body in the first mode of execution, and now magnetic coil is not yet energized, and described plunger is positioned at initial position.

Figure 12 is that described plunger backward movement is positioned at the sectional drawing of on-position when after the magnetic coil energising in Figure 11.

Figure 13 is the sectional drawing of plunger pump of the present invention in the second mode of execution.

Figure 14 is the sectional drawing of plunger pump of the present invention in the 3rd mode of execution.

Figure 15 is the sectional drawing of plunger pump of the present invention in the 4th mode of execution.

Embodiment

Shown in please refer to the drawing 1, present invention is disclosed a kind of plunger pump 100, it can be applied in exhaust treatment system 200.Described exhaust treatment system 200 comprise urea tank 201, the filter 202 be connected with described urea tank 201, in order to extracted urea solution from described urea tank 201 described plunger pump 100 and the nozzle 204 of urea will be sprayed in offgas duct 203.Urea liquid through atomization becomes ammonia through catalytic decomposition in described offgas duct 203, and described ammonia can generate harmless nitrogen and water with the oxynitrides generation redox reaction in tail gas, thus reduces the discharge of oxynitrides.In view of this tail gas disposal technique is known described those skilled in the art, the present invention does not repeat them here.

In illustrative embodiments of the present invention, described plunger pump 100 has function of measuring, and its internal moving components often comes and goes the urea liquid that operation once can pump equivalent.Described plunger pump 100 is working methods of a kind of pulsed, if provide power on/off pulse continuously, described plunger pump 100 just can continuous impulse formula pump liquid.Want the flow increasing (or reduction) pump, only need the frequency of the power on/off pulse increasing (or minimizing) pump just passable.

Shown in please refer to the drawing 2 to Fig. 4, described plunger pump 100 comprises the pump housing 1, is positioned at the magnetic coil 2 of the described pump housing 1 periphery and is positioned at the support 3 of described magnetic coil 2 periphery.The described pump housing 1 is fixed on described support 3.In illustrative embodiments of the present invention, the described pump housing 1 is fixed on described support 3 by screw 4.

Shown in please refer to the drawing 4 and Fig. 5, in illustrative embodiments of the present invention, the described pump housing 1 extends roughly along the longitudinal direction, it second pump housing 6 comprising first pump housing 5 and match with described first pump housing 5.In illustrative embodiments of the present invention, the shell of described first pump housing 5 and the shell of described second pump housing 6 are made by plastic material, so arrange, and can reduce costs on the one hand; The inside that heat that described magnetic coil 2 operationally produces is delivered to the described pump housing 1 can also be reduced on the other hand.In addition, described first pump housing 5 is provided separately with described second pump housing 6, and then is assembled into together, can die cost be reduced, also be convenient to the assembling of its inner body simultaneously.

Shown in please refer to the drawing 7, Figure 10 and Figure 11, described first pump housing 5 is roughly in funnel-like, and it comprises the first passage 53 that described first pump housing 5 is run through in the Exported Cone portion 51 being positioned at front end, the first assembly department 52 be connected with described Exported Cone portion 51 and front and back.Described first assembly department 52 is horn-like in what expand compared to described Exported Cone portion 51.Described urea liquid is pumped by described nozzle 204 via described first passage 53.Described first assembly department 52 comprise be connected with described first passage 53 the first cavity 521, be centered around the assembly wall 522 outside described first cavity 521, the flange 523 being positioned at described assembly wall 522 both sides and the some locating columns 524 protruded out backward.The top of described assembly wall 522 be provided with the first fluting 5221, circumferentially slot with described first 5221 be communicated with second slot 5222 and to slot 5222 the first guide slots 5220 run through backward from described second.Described first fluting 5221 width is along the longitudinal direction greater than described second fluting 5222 width along the longitudinal direction.Similarly, the bottom of described assembly wall 522 be provided with the 3rd fluting 5223, circumferentially slot with the described 3rd 5223 be communicated with the 4th slot 5224 and to slot 5224 the second guide slots 5225 run through backward from the described 4th.Described 3rd fluting 5223 width is along the longitudinal direction greater than described 4th fluting 5224 width along the longitudinal direction.Described first pump housing 5 is also provided with the first seal ring 54 be arranged in described first cavity 521.Shown in please refer to the drawing 11, described first seal ring 54 between described first pump housing 5 and described second pump housing 6, to improve sealing, prevents from leaking outside after mounting.

Shown in please refer to the drawing 5, Fig. 6 and Fig. 9, described second pump housing 6 comprise into mouth tube portion 61 and with described enter the second assembly department 62 of being connected of mouth tube portion 61.After assembling, described first seal ring 54 is socketed on the front end of described second assembly department 62.Described enter mouth tube portion 61 be provided with pre-and post perforative second channel 611.Enter the front end of mouth tube portion 61 described in described second assembly department 62 is positioned at, and compared to described enter mouth tube portion 61 protruding in the form of a ring.The top of described second assembly department 62 and bottom are respectively equipped with the first projection 621 and the second projection 622.

Described second pump housing 6 comprises the main spring 63 be installed in described second channel 611, the plunger 64 being held in described main spring 63 backward and the housing assembly 65 be socketed on described plunger 64.Described main spring 63 is Compress Spring, its in an initial condition (when namely described magnetic coil 2 is not energized) certain pretightening force is applied to described plunger 64.

The third channel 644 of described plunger 64 is run through in the lug boss 642 that described plunger 64 comprises base portion 641, extend back from described base portion 641, the extension part 643 extended forward from described base portion 641 and front and back.Described base portion 641, described lug boss 642 and described extension part 643 are all in cylindric, and the diameter of wherein said base portion 641 is greater than the diameter of described extension part 643.Setting like this, can form relatively large passage on the one hand in described base portion 641, is convenient to install damping ring 645 on described extension part 643 on the other hand.In embodiments of the present invention, described plunger 64 is made up of stainless steel soft magnet material.

Shown in please refer to the drawing 9 and Figure 11, in the first mode of execution of the present invention, described plunger 64 also comprises the inlet valve 68 inserted from front to back in described third channel 644.Described inlet valve 68 is one-way valves, it the first spool 683 comprising the first valve seat 681 being provided with the first valve port, the first spring 682 extruded with described first valve seat 681 phase and match with described first spring 682.Described inlet valve 68 in an initial condition, close by described first spool 683 by described first valve port.When the pressure that described inlet valve 68 is subject to is greater than the confining force of described first spring 682, described first spring 682 is compressed, and described first valve port is opened.During assembling, described inlet valve 68 to be inserted in described third channel 644 by entirety and is positioned at the front end of described plunger 64.In the first mode of execution of the present invention, described inlet valve 68 itself is an independently element, can buy, thus simplify design, facilitate installation from supplier's there entirety.

Shown in please refer to the drawing 8 and Figure 11, described housing assembly 65 comprises cylinder body 651, is installed on the stuffing box gland 652 on described cylinder body 651 and is connected to the installation sheet 653 of described stuffing box gland 652 rear end.Described cylinder body 651 comprises abutting part 6511, runs through the receiving groove 6513 of described abutting part 6511 and described accommodation section 6512 from the accommodating part 6512 that described abutting part 6511 extends forward and front and back.The diameter of described accommodation section 6512 is less than the diameter of described abutting part 6511, so that be socketed the second seal ring 6516 in the outside of described accommodation section 6512.Described abutting part 6511 is provided with the groove 6514 of accommodating described stuffing box gland 652.In order to enhanced leaktightness, the 3rd seal ring 654 is installed between described cylinder body 651 and described stuffing box gland 652.

Shown in please refer to the drawing 8 and Figure 11, in the first mode of execution of the present invention, described housing assembly 65 also comprises the outlet valve 67 inserted from front to back in described receiving groove 6513.Described outlet valve 67 is one-way valves, it the second spool 673 comprising the second valve seat 671 being provided with the second valve port, the second spring 672 extruded with described second valve seat 671 phase and match with described second spring 672.Described outlet valve 67 in an initial condition, close by described second spool 673 by described second valve port.When the pressure that described outlet valve 67 is subject to is greater than the confining force of described second spring 672, described second spring 672 is compressed, and described second valve port is opened.During assembling, described outlet valve 67 to be inserted in described receiving groove 6513 by entirety and is positioned at the front end of described cylinder body 651.In the first mode of execution of the present invention, described outlet valve 67 itself is an independently element, can buy, thus simplify design, facilitate installation from supplier's there entirety.

During assembling, first described main spring 63 is loaded described second pump housing 6; Then, load described plunger 64 and described housing assembly 65, wherein said extension part 643 enters in described receiving groove 6513 through described installation sheet 653, stuffing box gland 652 and the 3rd seal ring 654 successively; Then, described second pump housing 6 is assembled with described first pump housing 5.During assembling, first by described first projection 621 and described second projection 622 corresponding described first guide slot 5220 and the second guide slot 5225 respectively; Then, apply certain extruding force in the horizontal direction, by close to each other with described first pump housing 5 for described second pump housing 6, now first, second projection 621,622 described lays respectively in described second, the 4th fluting 5222,5224; Then, then apply certain warping force, first, second projection 621,622 described is screwed in described first, the 3rd fluting 5221,5223 respectively.Finally, described second pump housing 6 fits together with described first pump housing 5.Now, described main spring 63 provides certain decrement, carries out precompressed to described plunger 64.Shown in please refer to the drawing 11, after assembling, enter mouth tube portion 61 described in described main spring 63 is close, described inlet valve 68 and described outlet valve 67 are all near described Exported Cone portion 51.

Shown in please refer to the drawing 10 and Figure 11, the described pump housing 1 also comprises and is positioned at described plunger 64 rear and carries out spacing bounding means 66 in order to move backward to described plunger 64 when described magnetic coil 2 is energized.Shown in please refer to the drawing 11, in the first mode of execution of the present invention, described bounding means 66 is integrated with the shell of described second pump housing 6.In this embodiment, the quantity of part can be reduced, simplify assembling.Preferably, the barrel of described bounding means 66 is also provided with the perforate 661 be communicated with described second channel 611, to optimize the flowing of fluid when described plunger 64 moves backward.

Certainly, shown in please refer to the drawing 14, in other mode of executions of the present invention, described bounding means 66 also can be provided separately with the shell of described second pump housing 6, and then is assembled into together.In this embodiment, described bounding means 66 can be designed to the material different from the shell of described second pump housing 6, such as metal, thus can guarantee longer working life.

In addition, without departing from the case in the spirit of the invention, present invention further teaches other several mode of executions, brief description is as follows one by one.

Shown in please refer to the drawing 13, the second mode of execution of the present invention is roughly the same with the first mode of execution shown in Figure 11, and its difference is that inlet valve 68 ' is slightly different from the inlet valve 68 in described first mode of execution.In described second mode of execution, described inlet valve 68 ' is not modular design, its first spring 682 ' is for drawing high spring, one end (being rear end in the present embodiment) of described first spring 682 ' is fixed on the step surface in described base portion 641, and the other end (being front end in the present embodiment) is connected with the first spool 683 '.When described magnetic coil 2 is not energized, the front end of described extension part 643 closes by described first spool 683 ' under the pulling force of described first spring 682 '.The function of similar described first valve seat 681 can be played in the front end of described extension part 643.After described magnetic coil 2 is energized, described plunger 64 moves backward, and when the pressure that described inlet valve 68 ' is subject to is greater than threshold value, described first spring 682 ' can stretch by described pressure further, and now described inlet valve 68 ' is opened.

Shown in please refer to the drawing 14, the second mode of execution shown in the 3rd mode of execution with Figure 13 of the present invention is roughly the same, and its difference is: in described second mode of execution, and described bounding means 66 is integrated with the shell of described second pump housing 6; And in described 3rd mode of execution, described bounding means 66 and the shell of described second pump housing 6 are provided separately, and then be assembled into together.

Shown in please refer to the drawing 15, the second mode of execution shown in the 4th mode of execution with Figure 13 of the present invention is roughly the same, and its difference is that outlet valve 67 ' is slightly different from the outlet valve 67 in described second mode of execution.In described 4th mode of execution, described outlet valve 67 ' is not modular design, its second spring 672 ' is Compress Spring, one end (being front end in the present embodiment) of described second spring 672 ' is fixed on the step surface in described Exported Cone portion 51, and the other end (being rear end in the present embodiment) is connected with the second spool 673 '.The function of similar described second valve seat 671 can be played in the front end of described cylinder body 651.When described magnetic coil 2 is not energized, the front end of described cylinder body 651 closes by described second spool 673 ' under the pressure of described second spring 672 '.After described magnetic coil 2 is energized, described plunger 64 moves backward, when described inlet valve 68 ' is opened.Again when after the power-off of described magnetic coil 2, described plunger 64 travels forward, and fluid pressure overcomes described second spring 672 ', is opened by described outlet valve 67 '.

Shown in please refer to the drawing 4, described magnetic coil 2 is provided with pre-and post perforative through hole 21.

The roughly rectangular frame shaped of described support 3, it comprises front bulkhead 31, aft bulkhead 32 and connects the two side 33 of described front bulkhead 31 and described aft bulkhead 32.Described front bulkhead 31 is provided with the first perforate 311 corresponding to described through hole 21, the positioning hole 312 corresponding to described locating column 524 and with the tapped hole 313 be screwed into for described screw 4.Described aft bulkhead 32 is provided with the second perforate 321 corresponding to described through hole 21.The size of described second perforate 321 is less than described first perforate 311.In illustrative embodiments of the present invention, described support 3 is made up of metallic material, to realize good heat radiation.

In order to concentration magnetic force intensity, described plunger pump 100 is also provided with the sleeve member 7 be installed in described through hole 21.The 3rd sleeve member 73 that described sleeve member 7 comprises the first set barrier part 71 being connected to described second perforate 321 outer rim, the second sleeve member 72 compressed mutually with described first set barrier part 71 and compresses mutually with described second sleeve member 72.In illustrative embodiments of the present invention, described first set barrier part 71 is made up of metallic material with described 3rd sleeve member 73, and described second sleeve member 72 is made of plastics, and so arranges, and on the one hand, described second sleeve member 72 can provide certain fitting allowance; On the other hand, the be made up of metallic material first, the 3rd sleeve member 71,73 can collect the magnetic line of force, reduces magnetic force loss.It is spacing to realize that described first set barrier part 71 is connected to described second perforate 321 outer rim.Described 3rd sleeve member 73 extends in described first perforate 311.

Just working principle of the present invention is described below.

Shown in please refer to the drawing 11, urea liquid enters in described plunger pump 100 from described second channel 611 and described third channel 644.When described magnetic coil 2 is not energized, described inlet valve 68 cuts out, and described urea liquid is only full of the pipeline of inlet valve 68 rear end.

Shown in please refer to the drawing 12, when described magnetic coil 2 is energized, under the effect of electromagnetic force, described plunger 64 by rear driving, and then compresses described main spring 63.Now, described inlet valve 68 is opened, and urea liquid enters in pump chamber 8 along arrow through described inlet valve 68.Described pump chamber 8 is between described inlet valve 68 and described outlet valve 67.In the process, described bounding means 66 limits the position that described plunger 64 moves backward.The advantage of this design is, because plunger pump 100 can produce certain temperature in the course of the work, and this temperature can affect the mechanical property of main spring 63, and particularly the rear end attenuation ratio of main spring 63 decrement is more serious.If do not carry out in advance spacing to described main spring 63, it cannot ensure the stroke of described plunger 64, thus also just well can not control the amount of the urea liquid entered in pump chamber 8.But, just can be good at solving problems by arranging described bounding means 66, can guarantee that each stroke of described plunger 64 is all identical, thus reaching accurate urea function of measuring.

When described magnetic coil 2 again power-off time, described main spring 63 resets, and now plunger 64 is driven forwards, and the urea liquid in described pump chamber 8 is squeezed and is opened by described outlet valve 67, thus is pumped by urea.

Be appreciated that described first pump housing 5 forms a fluid passage jointly with described second pump housing 6, described first passage 53, second channel 611 and third channel 644 are all a part for described fluid passage.This fluid passage is provided with described inlet valve 68 and described outlet valve 67, by controlling the work of the opening of described inlet valve 68 and described outlet valve 67, the system that realizes of breaking.Such as, when described inlet valve 68 open, outlet valve 67 close time, realize filling urea liquid in described pump chamber 8; When described inlet valve 68 close, outlet valve 67 open time, the urea liquid in described pump chamber 8 is pumped.

In addition, the present invention is by arranging the bounding means 66 that extends in described second channel 611, and when described magnetic coil 2 is energized, described bounding means 66 can limit the distance of described plunger 64 movement backward, thus shortens the stroke of described plunger 64.Because stroke shortens, because this reducing the receptance of described plunger pump 100 pairs of temperature, the stroke that described plunger 64 can be made each is all identical, thus realizes good discharge stability and higher measuring accuracy.Preferably, when described magnetic coil 2 is not energized, described bounding means 66 at least extends to forward the middle part of described main spring 63.Setting like this, the stroke of the described plunger 64 of shortening that can be larger.The flow pumped due to per stroke have dropped, and is also beneficial to and realizes atomization preferably, thus improve the efficiency of vent gas treatment.In addition, by arranging the perforate 661 be communicated with described second channel 611 on the barrel of described bounding means 66, when described plunger 64 moves backward, the liquid of described bounding means 66 periphery can pass described perforate 661, avoid the formation of dead volume, be beneficial to the stationarity guaranteeing that described plunger 64 moves backward.

It should be noted that: bounding means 66 of the present invention with only play locate described main spring 63 position structure compared with existence in essence different.Usually, all shorter in order to the position structure of locating described main spring 63, even if when described main spring 63 is completely by compression, this position structure still cannot contact with described plunger 64, cannot realize limit function.In addition, for person of ordinary skill in the field, can draw in conjunction with decay curve, described main spring 63 leading portion stroke more accurate (linear), stroke more inaccuracy more backward, due to the end of this shorter position structure closely stroke, therefore in fact to the control of stroke accuracy be do not have at all effective.

In addition, above embodiment is only for illustration of the present invention and unrestricted technological scheme described in the invention, understanding of this description should based on person of ordinary skill in the field, such as " front and back are run through " refers to and did not run through before installing other parts, again such as to " front ", " afterwards ", " left side ", " right side ", " on ", the description of D score isotropy, although this specification reference the above embodiments are to present invention has been detailed description, but, those of ordinary skill in the art is to be understood that, person of ordinary skill in the field still can modify to the present invention or equivalent replacement, and all do not depart from technological scheme and the improvement thereof of the spirit and scope of the present invention, all should be encompassed in right of the present invention.

Claims (10)

1. a plunger pump, it comprises the pump housing and is positioned at the magnetic coil of described pump housing periphery, second pump housing that the described pump housing comprises first pump housing and matches with described first pump housing, described first pump housing comprises Exported Cone portion and the first assembly department, described second pump housing comprises into mouth tube portion and the second assembly department of matching with described first assembly department, described first pump housing and described second pump housing form a fluid passage jointly, described fluid passage is provided with inlet valve, outlet valve and the pump chamber between described inlet valve and described outlet valve, described fluid passage comprise be arranged at described in enter second channel in mouth tube portion, describedly enter main spring to be also installed and to be held in the plunger of described main spring in mouth tube portion, described inlet valve is positioned at the front end of described plunger, described plunger can to-and-fro motion under the effect of described magnetic coil and described main spring, described plunger comprises pre-and post perforative third channel, described third channel is connected with described second channel, it is characterized in that: described inlet valve comprises the first valve seat, the first spool and abuts the first spring of described first spool, and described inlet valve is inserted in described third channel by entirety.
2. plunger pump as claimed in claim 1, it is characterized in that: described plunger pump comprises the housing assembly being socketed on described plunger front end, described outlet valve comprises the second valve seat, the second spool and abuts the second spring of described second spool, and described outlet valve is inserted into the front end of described housing assembly by entirety.
3. plunger pump as claimed in claim 2, it is characterized in that: described housing assembly comprises cylinder body and is installed on the stuffing box gland on described cylinder body, described cylinder body comprises abutting part, runs through the receiving groove of described abutting part and described accommodation section from the accommodating part that described abutting part extends forward and front and back, and described outlet valve is inserted in described receiving groove.
4. plunger pump as claimed in claim 1, is characterized in that: described plunger pump also comprises the bounding means being positioned at described second channel, and described bounding means can in the position of the movement backward of plunger described in described magnetic coil energising limit.
5. plunger pump as claimed in claim 4, is characterized in that: described bounding means and described second pump housing are provided separately, and then fit together; Or
Described bounding means and described second pump housing one-body molded.
6. plunger pump as claimed in claim 4, is characterized in that: described main spring is socketed on described bounding means; When described magnetic coil is not energized, described bounding means extends at least forward the middle part of described main spring.
7. as the plunger pump that claim 4 is stated, it is characterized in that: the barrel of described bounding means is also provided with the perforate be communicated with described second channel.
8. plunger pump as claimed in claim 1, it is characterized in that: described first assembly department comprises assembly wall, described assembly wall be provided with the first fluting, circumferentially slot with described first and be communicated with second slot and to slot the first guide slot run through backward from described second; Described second assembly department is provided with the first projection, described first projection is slotted through described first guide slot and second successively when assembling, and then circumferentially being screwed in described first fluting, described first fluting width is along the longitudinal direction greater than described second fluting width along the longitudinal direction.
9. plunger pump as claimed in claim 1, it is characterized in that: described plunger pump comprises the support being positioned at described magnetic coil periphery, described support comprises front bulkhead, aft bulkhead and connects the two side of described front bulkhead and described aft bulkhead, the described pump housing by screw tightening on described support; Described magnetic coil is provided with pre-and post perforative through hole, described plunger pump is also provided with the sleeve member be installed in described through hole, the described pump housing is through described sleeve member, the second sleeve member that described sleeve member comprises first set barrier part, compress mutually with described first set barrier part and the 3rd sleeve member compressed mutually with described second sleeve member, described first set barrier part and described 3rd sleeve member are made up of metallic material, and described second sleeve member is made of plastics.
10. the application of plunger pump in urea injection system, described urea injection system is in order to process motor exhaust, described urea injection system comprises urea tank and nozzle, described plunger pump is connected between described urea tank and described nozzle, described plunger pump in order to by the urea solution pump in urea tank to described nozzle, it is characterized in that: described plunger pump is the plunger pump described in any one in claim 1 to 9.
CN201410501247.1A 2014-09-26 2014-09-26 Plunger pump and application thereof CN104314804A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107191350A (en) * 2016-03-15 2017-09-22 东莞辉奥电器有限公司 Fluid pump

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Publication number Priority date Publication date Assignee Title
EP1001167A2 (en) * 1998-11-13 2000-05-17 Mikuniadec Corporation Electromagnetic pump
CN201225248Y (en) * 2008-07-04 2009-04-22 宁波市佳音机电科技有限公司 Electromagnetic pump
CN101806238A (en) * 2010-03-13 2010-08-18 中国第一汽车集团公司 Air-assisted atomized urea reducing agent spraying controlling system of pump power
CN202176503U (en) * 2011-08-05 2012-03-28 邹爱贞 Electromagnetic water pump capable of changing plunger stroke
CN103256200A (en) * 2013-05-16 2013-08-21 常州孚华电器有限公司 Electromagnetic pump
CN103899392A (en) * 2014-04-29 2014-07-02 中国重汽集团济南动力有限公司 Air-assisted urea supply device used for diesel engine

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Publication number Priority date Publication date Assignee Title
EP1001167A2 (en) * 1998-11-13 2000-05-17 Mikuniadec Corporation Electromagnetic pump
CN201225248Y (en) * 2008-07-04 2009-04-22 宁波市佳音机电科技有限公司 Electromagnetic pump
CN101806238A (en) * 2010-03-13 2010-08-18 中国第一汽车集团公司 Air-assisted atomized urea reducing agent spraying controlling system of pump power
CN202176503U (en) * 2011-08-05 2012-03-28 邹爱贞 Electromagnetic water pump capable of changing plunger stroke
CN103256200A (en) * 2013-05-16 2013-08-21 常州孚华电器有限公司 Electromagnetic pump
CN103899392A (en) * 2014-04-29 2014-07-02 中国重汽集团济南动力有限公司 Air-assisted urea supply device used for diesel engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107191350A (en) * 2016-03-15 2017-09-22 东莞辉奥电器有限公司 Fluid pump
CN107191350B (en) * 2016-03-15 2019-05-24 东莞辉奥电器有限公司 Fluid pump

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