CN207393460U - Plunger metering pump plunger sealing structure and with its plunger metering pump - Google Patents

Abstract

The utility model provides a kind of plunger metering pump plunger sealing structure and with its plunger metering pump, wherein, plunger metering pump plunger sealing structure includes：Plunger；Bushing is socketed on plunger, and bushing is hierarchic structure, wherein, bushing includes the first liner section and the second liner section, and the outer diameter of the first liner section is less than the outer diameter of the second liner section；First sealing structure is set on the first liner section；Flow back casing, and insertion is arranged on the second liner section of bushing and is socketed on plunger；Two second seals structures, are socketed on plunger, and two second seals structures are located at the both sides of reflux casing respectively on the axial direction of plunger.It is suitable for the conveying of stable High Pressure Difference, small flow cleans material according to the plunger metering pump plunger sealing structure of the application；And it is possible to ensure the sealed reliable of pump, and material approximation No leakage or without leakage, stable, service life is long.

Description

Plunger metering pump plunger sealing structure and with its plunger metering pump

Technical field

The utility model is related to a kind of field of sealing technology of plunger metering pump, more specifically to a kind of plunger metering pump Plunger sealing structure and the plunger metering pump including the structure.

Background technology

A kind of common conveying equipment for fluid substances of plunger metering pump, it is moved back and forth by plunger in cylinder body, makes sealing work The volume for making cavity volume changes to realize that fluid conveys.Plunger pump has that rated pressure is high, compact-sized, efficient and flow The advantages that easy to adjust, is widely used in high pressure, the slurry that flow needs are adjusted and neat liquid conveying occasion, such as hydraulic pressure Machine, engineering machinery, ship and chemical machinery etc..

Clearance seal has the operation is stable, the advantages of usage time is long usually as the encapsulation scheme of super-pressure reciprocating pump. But plunger and plunger bushing be usually using the very high and extremely abrasive material of hardness, in addition in order to reduce amount of leakage, column The length of fit of plug and plunger bushing is usually very long, and the accuracy of manufacture is very high, and difficulty of processing is big.

It needs to compare using plunger metering pump conveying cleaning liquid and the less discharge pressure of feed flow for part occasion It is high, it is desirable that amount of leakage very little or No leakage.

Utility model content

The main purpose of the utility model is that providing a kind of plunger metering pump plunger sealing structure and including the structure Plunger metering pump, to solve in the prior art to be arranged to the length of fit of plunger and plunger bushing very to reduce leakage rate Long and so that the problem of accuracy of manufacture rise, difficulty of processing increase.

To achieve these goals, a kind of plunger metering pump plunger sealing structure is provided, including：Plunger；Bushing is socketed in On plunger, and bushing is hierarchic structure, wherein, bushing includes the first liner section and the second liner section, the first liner section it is outer Footpath is less than the outer diameter of the second liner section；First sealing structure is set on the first liner section；Flow back casing, and insertion is arranged on lining On second liner section of set and it is socketed on plunger；Two second seals structures, are socketed on plunger, and two second close Seal structure is located at the both sides of reflux casing respectively on the axial direction of plunger.

Further, plunger metering pump plunger sealing structure further includes the 3rd sealing structure, and the 3rd sealing structure is arranged on On bushing, and it is arranged on the one side away from the first liner section of reflux casing.

Further, the first sealing structure is arranged at the step surface between the first liner section and the second liner section.

Further, plunger metering pump plunger sealing structure further includes the reflux outlet connected with reflux casing.

Further, bushing further includes the 3rd liner section, the second liner section be located at the first liner section and the 3rd liner section it Between, the outer diameter of the 3rd liner section is more than the outer diameter of the second liner section, and the 3rd sealing structure is arranged on the second liner section and the 3rd lining It covers at the step surface between section.

Further, the first sealing structure and the 3rd sealing structure are sealing ring, and second seals structure is this spy's envelope.

Further, reflux outlet is connected with head tank or pump intake.

Further, reflux casing is arranged at the step surface between the second liner section and the 3rd liner section.

Further, bushing is made of hard, wear-resistant nonmetallic materials.

According to the another aspect of the application, a kind of column for including any of the above-described kind of plunger metering pump plunger sealing structure is provided Fill in metering pump.

Stable High Pressure Difference, small flow cleans material are suitable for according to the plunger metering pump plunger sealing structure of the application Conveying；Also, the application is in a manner that the first sealing structure, second seals structure and return-flow structure are combined, Ke Yibao The sealed reliable of pump, and material approximation No leakage or without leakage are demonstrate,proved, stable, service life is long.

Description of the drawings

The accompanying drawings which form a part of this application are used to provide a further understanding of the present invention, this practicality New schematic description and description does not form the improper restriction to the utility model for explaining the utility model. In the accompanying drawings：

Fig. 1 shows the sectional view of the plungers pump plunger sealing structure of the utility model；

Fig. 2 shows that the leading portion bushing of the utility model shows in the pressure on the pressure side generated between plunger bushing external seal It is intended to.

Wherein, above-mentioned attached drawing is marked including the following drawings：

1st, plunger；2nd, bushing；3rd, the first sealing structure；4th, the pump housing；6th, flow back casing；7th, the 3rd sealing structure；8th, entrance Check valve；9th, Outlet check valves；10th, flow back outlet；This spy's envelope of 11a, leading portion；This spy's envelope of 11b, back segment；21st, the first bushing Section；22nd, the second liner section；23rd, the 3rd liner section.

Specific embodiment

The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole Embodiment.It is illustrative to the description only actually of at least one exemplary embodiment below, is never used as to this practicality New and its application or any restrictions used.Based on the embodiment in the utility model, those of ordinary skill in the art are not having All other embodiments obtained under the premise of creative work are made, shall fall within the protection scope of the present invention.

It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " bag Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.

Unless specifically stated otherwise, the component and positioned opposite, the digital table of step otherwise illustrated in these embodiments Up to the unlimited the scope of the utility model processed of formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each shown in attached drawing The size of a part is not to be drawn according to actual proportionate relationship.For skill known to person of ordinary skill in the relevant Art, method and apparatus may be not discussed in detail, but in the appropriate case, the technology, method and apparatus should be considered as awarding Weigh part for specification.In shown here and discussion all examples, any occurrence should be construed as merely example Property, not as limitation.Therefore, the other examples of exemplary embodiment can have different values.It should be noted that：It is similar Label and letter similar terms is represented in following attached drawing, therefore, once be defined in a certain Xiang Yi attached drawing, then with It need not be further discussed in attached drawing afterwards.

The plunger metering pump plunger sealing structure of the utility model coordinates this spy's envelope of multistage to realize conveying by clearance seal Small flow high pressure power cleaning material approximation inclusion seal.Wherein, clearance seal selects suitable hard, wear-resistant nonmetallic materials As plunger bushing, set correct plunger bushing external seal position and plunger bushing on the pressure side with plunger bushing external seal Between part wall thickness, making plunger bushing, some can be deformed in seal pressure medium, make plunger bushing and plunger it Between interval smaller so that amount of leakage is very small.And traditional clearance seal is cooperated using the very high material of hardness, from And can not possibly accomplish zero clearance, it is otherwise easily stuck.Therefore, compared with traditional clearance seal, the sealing knot of the utility model Structure can realize No leakage or without leakage, and stable, and service life is long.

In the application, by the way that bushing is arranged to set sealing structure at step that is stepped and engaging in stepped bushing Correct plunger bushing external seal position is set, so as to be pressurized outside bushing leading portion, can generate part deformation.

In the application, plunger bushing refers to the leading portion of plunger (i.e., in the part on the pressure side between plunger bushing external seal The first liner section 21 being described below), which determines material, both sides pressure difference, the deflection of control.For different defeated Medium and conveying pressure difference is sent to select bushing material, this segment thickness needs to be set by the deflection under material and pressure difference It puts.

Also, clearance seal rear end sets two sections of auxiliary seals (that is, second seals structure and the 3rd sealing structure) and returns Flow structure, bushing leading portion step (that is, the first liner section) are set and the static sealing ring of the pump housing, liner aft end auxiliary seal (that is, the Two sealing structures) and back-end sealing circle (that is, the 3rd sealing structure) realizes the sealing to flow back and guarantee is without leakage.It is first during pump work No leakage first ensured by clearance seal, because bushing approximation zero clearance and bushing material is wear-resisting, ensures that clearance seal has for a long time Effect, when clearance seal has minor leakage, the first sealing structure seals, and after the first sealing structure is revealed, amount of leakage leads to It crosses return-flow structure and is drawn out to entrance, this spy's envelope of the back segment of second seals structure and back-end sealing circle (that is, the 3rd sealing structure) are protected Not outward leakage is demonstrate,proved, because this spy's envelope of the back segment of second seals structure and back-end sealing circle pressure-bearing ratio are relatively low, service life is very long.

Fig. 1 shows the sectional view of the plungers pump plunger sealing structure of the utility model.As shown in Figure 1, the plunger pump plunger shaft Plug sealing structure includes the plunger 1 being arranged in the pump housing 4.The plunger 1 can move back and forth in the pump housing 4.It is socketed on plunger 1 Bushing 2, the bushing 2 are made of nonmetallic materials, are preferably PEEK materials.Bushing 2 is hierarchic structure, the plurality of hierarchic structure Outer diameter simultaneously differs.As shown in the example of figure 1, from the front end of bushing 2 to the back-end, which includes the be sequentially connected first lining Cover 21 and second liner section 22 of section.Also, the outer diameter of the first liner section 21 is smaller than the outer diameter of the second liner section 22.

First sealing structure 3 is set on the first liner section 21, and the first sealing structure 3 can be such as sealing ring.Certainly, First sealing structure 3 or any other sealing structure that bushing 2 can be sealed.Implemented according to the application one Example, first sealing structure 3 are arranged between the first liner section 21 and the second liner section 22, such as, are arranged on the first liner section 21 and the second step surface between liner section 22 at.

Since 21 outer diameter of the first liner section of bushing 2 is smaller so that 2 leading portion thin location of bushing, so as to the first of bushing 2 On the pressure side between plunger bushing external seal there are certain pressure difference, some can be deformed plunger bushing 2 liner section 21, make column The approximate interference fit of gap smaller between bushing 2 and plunger 1 is filled in, amount of leakage is very small, as shown in Figure 2.

The reflux insertion of casing 6 is arranged on the second liner section 22 of bushing 2 and is socketed on plunger 1.

Through hole is provided on second liner section 22, reflux casing 6 is inserted into the through hole and is socketed on plunger 1.Two Second seals structure, i.e. this special big envelope is connected on plunger 1, also, two second seals structures are on the axial direction of plunger 1 It is located at the both sides of reflux casing 6 respectively.Two second seals structures are respectively this spy envelope 11a of leading portion and this spy's envelope of back segment 11b.Such as Shown in Fig. 1, leading portion this spy envelope and back segment this spy envelope is socketed on plunger 1, and on the axial direction of plunger 1 respectively close to The both sides of the reflux casing 6.The reflux casing 6 is in fluid communication with reflux outlet 10, and reflux outlet 10 and outer tube are (not Show) it is in fluid communication, outer tube is connected with head tank or pump intake.So as to which this spy's envelope of leading portion 11a is 1 institute of bushing 2 and plunger The supplement of clearance seal is formed, this spy's envelope of back segment 11b maintains the reflux for casing 6 not to plunger axial leakage.

According to one preferred embodiment of the application, bushing 2 further includes the 3rd liner section 23, and the connection of the 3rd liner section 23 is set At the rear portion of the second liner section 22, i.e. the second liner section 22 is between the first liner section 21 and the 3rd liner section 23.Also, The outer diameter of 3rd liner section 23 is more than the outer diameter of the second liner section 22.So as to, from the front end of bushing 2 to rear end, the first liner section 21st, the outer diameter of the second liner section 22 and the 3rd liner section 23 successively increases.

Preferred embodiment as shown in Figure 1, reflux casing 6 are arranged on being served as a contrast away from first for the second liner section 22 of bushing 2 Cover the one end of section 21, i.e. reflux casing 6 is arranged on the second liner section 22 of the second liner section 22 and the neighbour of the 3rd liner section 23 Meet place.

In addition, the plunger metering pump plunger sealing structure can also include the 3rd sealing structure 7, the 3rd sealing structure 7 The rear end of bushing 2 can be arranged on, and is arranged on the one side away from the first liner section 21 of reflux casing 6, is such as set In the second liner section 22 and the adjoiner of the 3rd liner section 23.Preferably, the 3rd sealing structure 7 is arranged on 22 He of the second liner section At step surface between 3rd liner section 23, more specifically, the 3rd sealing structure 7 can be arranged on behind reflux casing 6, from And prevent leakage material leaks outside.3rd sealing structure 7 can be sealing ring, naturally it is also possible to for it is any other can be to bushing 2 sealing structures being sealed.

That is, bushing 2 and plunger 1 form clearance seal, this spy's envelope of leading portion 11a below is the supplement of clearance seal Sealing, this spy's envelope of back segment 11b ensure to draw without leaking outside from reflux casing 6 during leakage.First sealing structure 3 keep bushing 2 with The pump housing 4 seals, the sealing of the first sealing structure 3 and the 3rd sealing structure 7 guarantee reflux casing 6 and the outlet 10 that flows back.

When having micro-leakage after the leading portion clearance seal of plunger 1, i.e. the first sealing structure 3 abrasion, the micro-leakage object By leading portion, this spy's envelope 11a sealing throttles material first, if this spy's envelope of leading portion 11a is also worn, then leaked substance is covered by flowing back Pipe 6 and reflux outlet 10 and outer tube are led to head tank or pump intake, this spy envelope 11b of back segment and the 3rd sealing structure 7 Can ensure the material of leakage will not leak outside.

Therefore, this spy's envelope seals for the supplement of seal with buss, when bushing and plunger gap seals are leaked when having a small amount of leakage Si Te envelopes can also play sealing function prevent leakage, and the casing that flows back in leakage draws leakage fluid can head tank.

Fig. 2 shows that the leading portion bushing of the utility model shows in the pressure on the pressure side generated between plunger bushing external seal It is intended to.Wherein, arrow representative pressure, 21 outside arrow of the first liner section is intensive and 1 side arrow rareness of plunger is represented inside and outside bushing Subtle flow occurs for compression situation, outside bushing 2 under the effect of pump head high-pressure medium, and the first liner section 21 and 1 gap of plunger are more Small, so as to approximate interference fit, and size is related with compressive deformation inside and outside pumphead pressure, that is, bushing.

As shown in Fig. 2, the first sealing structure 3 prevents fluid (liquid) along 2 outer rim of bushing rearwards into the second liner section 22, Sealing surface A seals interface before and after the first sealing structure 3, and the outside of the first liner section 21 is there are pump head fluid (liquid) pressure, such as Shown in arrow, the second liner section 22 is not subject to pump head fluid (liquid) pressure.

Illustrate the plunger metering pump using above-mentioned plunger metering pump plunger sealing structure in an illustrative manner below.

Using the plunger pump of above-mentioned form sealing in laboratory room small-sized hydrogenation plant water injecting pump, pump priming amount is 1kg/h, Yang Cheng 20MPa.Both the plunger 1 of pump uses PEEK materials using the higher set bitt plug of finish, the bushing 2 of pump, and control Gap is in 2 (that is, 20 microns) left and right.When plunger 1 moves inward, work room pressure reduces, and Outlet check valves 9 are closed, During less than inlet pressure, inlet one-way valve 8 is opened, and material flows into；When plunger 1 is pushed out, chamber pressure rise, entrance Check valve 8 is closed, and during higher than outlet pressure, Outlet check valves 9 are opened, material outflow.

The forepart thickness of the bushing 2 of the metering pump is smaller so that bushing leading portion thin location, in pump leading portion, bushing 2 is in pressure There are certain pressure difference between side and plunger bushing external seal, some can be deformed 2 leading portion of plunger bushing, make 2 He of plunger bushing Become approximate interference fit between plunger 1, the amount of leakage of material is very small.First is provided at first liner section 21 of bushing 2 Sealing structure 3 realizes the sealing of bushing 2 and the pump housing 4, and after the first sealing structure 3 is worn, by leading portion, this is special first for minor leakage 11a sealing throttlings are sealed, if this spy's envelope of leading portion 11a is also worn, leakage material passes through flow back casing 6 and reflux outlet 10 and outer Portion, which takes over, is led to head tank or pump intake, this spy envelope 11b of the back segment of second seals structure and the 3rd sealing structure 7 of bushing 2 ensure Leakage material will not leak outside.

Such design pump does not run 6 months substantially No leakages continuously due to reflux, when reflux outlet 10 has material flow It when going out, is led back by the outer tube being connected with the reflux outlet 10 to head tank, and suitably tunes up pump stroke continuously operation 6 A month, there is not leakage, pump discharge is stablized, and operating status is better.Therefore, the sealing structure of this plunger metering pump is conveying Cleaning material needs very little flow, and High Pressure Difference approximation No leakage, there is preferable using effect.

Therefore, stable High Pressure Difference, small flow cleans are suitable for according to the plunger metering pump plunger sealing structure of the application The conveying of material；Also, the application is using clearance seal (that is, the first sealing structure), auxiliary seal (that is, second seals structure) And the mode that return-flow structure is combined, it is ensured that the sealed reliable of pump, and material approximation No leakage or without leakage, operation Stablize, service life is long；Furthermore the plunger lagging material of the application does not select high hard high abrasion resisting material, and seal length is also significantly Shorten, so as to which difficulty of processing substantially reduces, and by controlling the gap between plunger and bushing, so as to by leakage rate The characteristics of controlling to obtain smaller, and then amount of leakage smaller, while remaining clearance seal, the operation is stable, usage time are long.

In the description of the utility model, it is to be understood that the noun of locality such as " forward and backward, upper and lower, left and right ", " horizontal, Vertically, vertically, it is horizontal " and " pushing up, bottom " etc. indicated by orientation or position relationship be normally based on orientation or position shown in the drawings Relation is put, be for only for ease of description the utility model and simplifies description, in the case where not making explanation on the contrary, these nouns of locality It does not indicate that and implies signified device or element must have specific orientation or with specific azimuth configuration and operation, because This is it is not intended that limitation to scope of protection of the utility model；The noun of locality " inside and outside " refers to the wheel compared with each component in itself Wide is inside and outside.

For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ", " ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy The spatial relation of sign.It should be appreciated that spatially relative term is intended to comprising the orientation except device described in figure Outside different azimuth in use or operation.For example, if the device in attached drawing is squeezed, it is described as " in other devices It will be positioned as " under other devices or construction after the device of part or construction top " or " on other devices or construction " Side " or " under other devices or construction ".Thus, exemplary term " ... top " can include " ... top " and " in ... lower section " two kinds of orientation.The device can also other different modes positioning (being rotated by 90 ° or in other orientation), and And respective explanations are made to the opposite description in space used herein above.

Furthermore, it is necessary to explanation, limits parts, it is only for be convenient for using the words such as " first ", " second " Corresponding parts are distinguished, such as without Stated otherwise, above-mentioned word is there is no particular meaning, therefore it is not intended that this The limitation of utility model protection scope.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model Within, any modifications, equivalent replacements and improvements are made should be included within the scope of protection of this utility model.

Claims (10)

1. a kind of plunger metering pump plunger sealing structure, which is characterized in that including：

Plunger (1)；

Bushing (2) is socketed on the plunger (1), and the bushing (2) is hierarchic structure, wherein, bushing (2) bag The first liner section (21) and the second liner section (22) are included, the outer diameter of first liner section (21) is less than second liner section (22) outer diameter；

First sealing structure (3) is set on first liner section (21)；

Flow back casing (6), and insertion is arranged on the second liner section (22) of the bushing (2) and is socketed in the plunger (1) On；

Two second seals structures are socketed on the plunger (1), and two second seals structures are in the plunger (1) it is located at the both sides of the reflux casing (6) on axial direction respectively.

2. plunger metering pump plunger sealing structure according to claim 1, which is characterized in that the plunger metering pump plunger Sealing structure further includes the 3rd sealing structure (7), and the 3rd sealing structure (7) is arranged on bushing (2), and is arranged on institute State the one side away from first liner section (21) of reflux casing (6).

3. plunger metering pump plunger sealing structure according to claim 1, which is characterized in that first sealing structure (3) it is arranged at the step surface between first liner section (21) and second liner section (22).

4. plunger metering pump plunger sealing structure according to claim 1, which is characterized in that the plunger metering pump plunger Sealing structure further includes the reflux outlet (10) connected with the reflux casing (6).

5. plunger metering pump plunger sealing structure according to claim 2, which is characterized in that the bushing (2) further includes 3rd liner section (23), second liner section (22) be located at first liner section (21) and the 3rd liner section (23) it Between, the outer diameter of the 3rd liner section (23) is more than the outer diameter of second liner section (22), and the 3rd sealing structure (7) sets It puts at the step surface between second liner section (22) and the 3rd liner section (23).

6. plunger metering pump plunger sealing structure according to claim 2, which is characterized in that first sealing structure (3) and the 3rd sealing structure (7) is sealing ring, and the second seals structure is this spy's envelope.

7. plunger metering pump plunger sealing structure according to claim 4, which is characterized in that the reflux outlet (10) It is connected with head tank or pump intake.

8. plunger metering pump plunger sealing structure according to claim 5, which is characterized in that the reflux casing (6) sets It puts at the step surface between second liner section (22) and the 3rd liner section (23).

9. the plunger metering pump plunger sealing structure according to any one of claim 1-8, which is characterized in that the bushing (2) it is made of hard, wear-resistant nonmetallic materials.

10. a kind of plunger metering pump, which is characterized in that the plunger metering pump is included according to any one of claim 1-9 institutes The plunger metering pump plunger sealing structure stated.