CN109854497B - Three-screw labyrinth seal cutting fluid pump - Google Patents
Three-screw labyrinth seal cutting fluid pump Download PDFInfo
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- CN109854497B CN109854497B CN201910029034.6A CN201910029034A CN109854497B CN 109854497 B CN109854497 B CN 109854497B CN 201910029034 A CN201910029034 A CN 201910029034A CN 109854497 B CN109854497 B CN 109854497B
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Abstract
The utility model provides a three screw rod labyrinth seals cutting fluid pump, includes the end cover at both ends and middle casing, and both ends end cover one end is the radial oil absorption end cover of keeping away from the motor for the general flange end cover of connecting the motor, the other end, and the pivot has been laid along the axial at the casing center, and its characteristics are: the cutting fluid is 95% water and 5% oily cutting fluid, the pivot of laying along the axial at casing center is the three screw rod rotors of modification, is provided with extension labyrinth seal groove on the initiative screw rod of this three screw rod rotors of modification, is equipped with the labyrinth seal flange end cover supporting with this extension labyrinth seal groove between general flange end cover and casing. The invention solves the problem that the volumetric efficiency of the cutting fluid pump can not be further improved for a long time by changing the position of the labyrinth seal groove, increasing the length of the labyrinth seal groove, performing anti-rusting and wear-resisting treatment on the three-screw material and organically combining and interdependently combining the three parts, improves the volumetric efficiency of the cutting fluid pump from 40-50 percent to 70 percent, creates the historical records at home and abroad, and fills the blank at home and abroad.
Description
Technical Field
The invention belongs to the technical field of cutting fluid pumps, and particularly relates to a three-screw labyrinth seal cutting fluid pump.
Background
The cutting fluid pump widely used in the industrial field at present is mainly divided into two types, one type is a blade type centrifugal pump adopted by most people, the core working part of the blade pump is not a rotor but an impeller, and the impeller in the blade pump is arranged in an open mode and is not closed, so that the volumetric efficiency is generally low, the volumetric efficiency can only reach about 60 percent and generally can only reach 40 to 50 percent when the volumetric efficiency is high, the working rotating speed is higher, and the blade pump cannot work at low speed, is generally called as a speed type pump, and the mechanical energy of the impeller needs to be converted into the kinetic energy of fluid by means of the high rotating speed, so that the function of conveying the fluid is realized. Another type of cutting fluid pump is the screw pump, which is a positive displacement pump that performs the delivery function by periodically displacing the enclosed volume of the pump chamber. The first advantage of the screw pump compared with an impeller pump is that the screw pump has a large rotating speed range, can normally work at a very low rotating speed and achieves the volumetric efficiency of the impeller pump at a high speed; secondly, the outlet pressure of the screw pump is higher than that of the impeller pump.
Although the outlet pressure of the screw pump is high, the volume efficiency of the prior art using the screw pump still cannot achieve the ideal effect: typically only 50% volumetric efficiency is achieved. As in application No. 201320777841.4, utility model name: the technical scheme adopts a method of combining labyrinth seal and mechanical seal, wherein the number 15 in the figure is labyrinth seal, and the technical scheme has three problems, namely, the labyrinth seal is arranged at the outermost side in the axial direction of a pump body, namely the labyrinth seal is arranged at the foremost end in the axial direction; secondly, because the labyrinth seal groove in the prior art is embedded in the seal cover (a universal flange end cover), the length of the labyrinth seal groove is limited by the thickness of the seal cover, so that the number or the length of the labyrinth seal groove of the screw pump in the prior art is relatively short, and the sealing effect can be influenced by the small number or insufficient length of the labyrinth seal groove; thirdly, the tooth root and the tooth crest of the screw pump rotor in the prior art are concentric circles, and the tooth crest and the tooth root cannot be completely meshed because the tooth crest and the tooth root are different in radius of the concentric circles, and because the tooth crest and the tooth root cannot be completely meshed, a part of liquid is remained in the tooth root, and the liquid cannot be completely discharged, so that the volumetric efficiency of the screw pump is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a three-screw labyrinth seal cutting fluid pump, aiming at solving the problems that the liquid of a screw pump leaks out, the length of a labyrinth seal groove is limited by a seal cover, and the tooth crests and the tooth roots of the cross section of a screw cannot be completely meshed, so that the volume efficiency is low.
In order to solve the technical problem, the invention provides the following technical scheme:
the utility model provides a three screw rod labyrinth seals cutting fluid pump, includes the end cover at both ends and middle casing, and both ends end cover one end is the radial oil absorption end cover of keeping away from the motor for the general flange end cover of connecting the motor, the other end, is the casing between general flange end cover and the radial oil absorption end cover, and the pivot has been laid along the axial at the casing center, and casing surface is close to general flange end cover one end and is provided with the oil outlet, and its characteristics are: the cutting fluid is 95% water and 5% oily cutting fluid, the pivot of laying along the axial at casing center is the three screw rod rotors of modification, is provided with extension labyrinth seal groove on the initiative screw rod of this three screw rod rotors of modification, is equipped with the labyrinth seal flange end cover supporting with this extension labyrinth seal groove between general flange end cover and casing.
The modified three-screw rotor comprises a main screw in the middle and slave screws on two sides, and the diameter of the main screw is larger than that of the slave screws; the circular arcs of the tooth crest and the tooth root of each tooth of the cross section of the profile modification three-screw are two circular arcs which can be completely meshed, and the circle centers of the two completely meshed circular arcs are not concentric with the circle center of the gear; the circle centers of the tooth tops and the tooth roots of the cross sections of the three screw rods of the modified helical gear can be arranged at positions smaller than the radius of the gear as required, and two circular lines corresponding to respective circular arcs of the tooth tops and the tooth roots are the same.
The shape-modified three-screw adopts an antirust alloy material, and is subjected to heat treatment and wear resistance.
The labyrinth seal flange end cover is sleeved on the outer ring of the lengthened labyrinth seal groove of the main screw, and the position and the length of the lengthened labyrinth seal groove on the main screw are matched with the position and the length of the labyrinth seal flange end cover on the main screw; the labyrinth seal flange end cover is provided with a large outer diameter part and a small outer diameter part along the axial direction, and the inner diameters of the large outer diameter part and the small outer diameter part are the same; the large outer diameter part is used for being connected with the universal flange end cover, and the small outer diameter part is used for prolonging the labyrinth seal channel.
The labyrinth seal large-outer-diameter part is connected with a universal flange end cover through a bearing and a screw, and the bearing is axially and respectively bridged on the respective bearing steps of the universal flange end cover and the labyrinth seal flange end cover which are arranged oppositely.
The end face of the large outer diameter part connected with the universal flange end cover is provided with two steps which are from small to large along the radius direction and are sunken from outside to inside, the first step which is from small to large along the radius direction of the end face is a step with relatively small diameter and relatively deep sunken, and the step is used for installing a bearing for connecting the labyrinth seal end cover and the universal flange end cover; the second step from small to large along the radius direction of the end face is a step with relatively large diameter and relatively shallow recess, and the step is used for installing an O-shaped sealing ring for connecting the labyrinth sealing end cover and the universal flange end cover.
The end face of the universal flange end cover connected with the large-outer-diameter part is also provided with two steps which are from small to large along the radius direction and are sunken from outside to inside, the first step which is from small to large along the radius direction of the end face is a step with a relatively small diameter and a relatively deep sunken part, and the step is used for installing framework sealing; the second step from small to large along the radius direction of the end face is a step with relatively large diameter and relatively shallow recess, and the step is used for installing and connecting a bearing of the universal flange end cover and the labyrinth seal end cover.
The first step of the large outer diameter part is also provided with a flow guide hole which penetrates through two axial end faces of the large outer diameter part, the flow guide hole is connected with a flow guide pipe on the end face where the large outer diameter part is connected with the small outer diameter part, and one end of the flow guide pipe, which is far away from the connected end face, is connected with a flow guide channel of the shell; and liquid leaked between the universal flange end cover and the labyrinth seal flange end cover flows back through the guide holes, the guide pipe and the guide channel and is discharged into the radial oil suction cover at the other end of the shell.
The flow guide holes penetrating through the two axial end faces of the large outer diameter part are two flow guide holes which are obliquely formed in a non-coaxial mode, one hole is formed in the radial inner side of the first step of the large outer diameter part, and the other hole is formed in the radial outer side, opposite to the first step, of the small outer diameter part and the large outer diameter part which are connected.
The labyrinth seal groove is directly machined on the main screw rod, and a separate labyrinth seal is not arranged on the main screw rod.
Advantageous effects of the invention
1. According to the invention, by designing the lengthened labyrinth seal groove on the main screw and designing the special labyrinth seal end cover, and by separately and independently using the universal flange end cover and the labyrinth seal flange end cover on the cutting fluid pump, the length of the labyrinth seal groove is not limited by the thickness of the universal flange end cover, so that the length of the labyrinth seal groove is designed according to the requirement, the total length of the labyrinth seal groove can be doubled, and the resistance of liquid leakage along the main screw is doubled.
2. According to the invention, the anti-rusting alloy is adopted as the three-screw material, the material is subjected to heat treatment, and the wear resistance of the material is improved, so that the screw which originally only can use oil as a working medium can also achieve the wear resistance effect and the anti-rusting effect of an oil solution when the screw is used for a cutting fluid pump with 95% of water.
3. The invention increases the leakage-proof triple protection mechanism by changing the layout position of the labyrinth seal groove: firstly, a universal flange end cover arranged at the end part of a pump body is improved to be arranged at the inner side or the rear end of the universal flange end cover by labyrinth seal, so that the path of liquid leakage is lengthened or the resistance is increased; secondly, a flow guide hole is formed in the liquid outlet of the labyrinth seal groove, even if a small amount of liquid leaks to the universal flange end cover at the front end from the outlet, the liquid can flow back into the oil suction cover at the rear end from the flow guide hole, and a framework seal is arranged at the front end of the flow guide hole and in the first step of the universal flange end cover, so that the possibility of liquid leakage from the universal flange end cover is reduced; and thirdly, an O-shaped sealing ring is arranged between the universal flange end cover and the labyrinth seal flange end cover, so that the outward path of liquid leaking from the universal flange end cover is further blocked. According to the above, the position of the labyrinth seal groove is changed, so that triple protection means for preventing liquid leakage is added, a liquid outflow channel is prolonged, and the resistance of liquid outflow is increased, thereby thoroughly avoiding the possibility of liquid leakage.
4. The invention solves the problem that the volumetric efficiency of the cutting liquid pump can not be further improved for a long time by changing the position of the labyrinth seal groove, increasing the length of the labyrinth seal groove, performing anti-rusting and wear-resisting treatment on a three-screw material and organically combining, supporting and interdependent the three, improves the volumetric efficiency of the cutting liquid pump from 40-50 percent to 70 percent, creates the historical records at home and abroad and fills the blank at home and abroad.
Drawings
FIG. 1 is an outline view of a three-screw pump labyrinth seal cutting fluid pump according to the present embodiment;
FIG. 2 is an outline view of a casing of a three-screw pump labyrinth seal cutting fluid pump according to the present embodiment;
FIG. 3 is an outline view of a radial oil suction cover of the three-screw pump labyrinth seal cutting fluid pump according to the embodiment;
FIG. 4 is a schematic view of the third screw of the present embodiment;
FIG. 5 is a schematic view of the main screw of the present embodiment;
FIG. 6 is a first perspective view of the internal structure of the labyrinth seal cutting fluid pump of the three-screw pump according to the embodiment;
FIG. 7 is a first perspective view of a labyrinth seal flange end cover according to the present embodiment;
FIG. 8 is a second perspective view of a labyrinth seal flange end cover according to the present embodiment;
FIG. 9 is a second perspective view of the internal structure of the labyrinth seal cutting fluid pump of the three-screw pump according to the embodiment;
fig. 10 is a schematic view of a universal flange end cover according to the present embodiment.
In the figure, 1 is a universal flange end cover; 1-1: a first step; 1-2: a second step; 1-3: sealing the framework; 1-4: a set screw; 2: a housing; 2-1: fixing the connecting hole; 2-2: a flow guide channel; 2-3: an oil outlet hole; 3: a radial oil suction cover; 3-1: an oil suction hole; 3-2: fixing the connecting hole; 4: labyrinth seal flange end covers; 4-1: a large outer diameter portion; 4-2: a small outer diameter portion; 4-1-1: a first step; 4-1-2: a second step; 4-1-3-1: a flow guide hole; 4-1-3-2: a flow guide hole; 4-3: a bearing; 5-1: a driving screw rotor; 5-1-1: lengthening a labyrinth seal groove; 5-2: a driven screw rotor; 5-3: a driven screw rotor.
Detailed Description
Design principle of the invention
1. Lengthening the labyrinth seal groove design principle. The traditional labyrinth seal groove is generally arranged in a flange end cover of the pump body, namely arranged at the axial end part of the pump body, and the length of the traditional labyrinth seal groove is short due to the limitation of the thickness of the universal flange end cover, and the path for blocking liquid leakage is short, so that the sealing effect is limited. The labyrinth seal groove flange end cover is additionally arranged between the seal end cover and the shell, is specially designed for increasing the length of a labyrinth seal groove, is twice as long as the length of a common flange end cover, and comprises a large outer diameter part and a small outer diameter part, wherein the length of the small outer diameter part is a part which is longer than that of the common flange end cover. Due to the special design of the labyrinth seal groove flange end cover, the length of the labyrinth seal groove can be designed to be long enough. The length of the labyrinth seal groove is doubled, so that the path of the liquid blocked is doubled, and the sealing effect is doubled.
2. Triple protection leakage-proof principle. The labyrinth seal groove is arranged at the end part of the pump body, once liquid leakage can not be saved, the labyrinth seal groove is provided with a triple protection structure, the first layer of protection is that a flow guide hole is arranged on the end surface of the labyrinth seal flange between two flange end covers, the flow guide hole is obliquely arranged downwards, so that the liquid between the two flange end covers can be conveniently intercepted and does not continuously flow towards the end part of the pump body, and the liquid finally flows into the oil suction hole along the gravity direction and the return direction along the shell flow guide channel; the second layer of protection mechanism is that an O-shaped sealing ring is arranged between the two flange end covers and arranged on a second step with the two flanges sunken inwards; the third layer of protection mechanism is that a skeleton seal is arranged on a first inwards concave step of the flange end cover opposite to the labyrinth seal flange end cover, and the skeleton seal further blocks the outlet of liquid flowing out of the pump body.
3. And (3) a modified three-screw design principle. The radians of the addendum and the dedendum of the cross section of the common screw are radians corresponding to different radiuses on the concentric circle, and the two radians of the addendum and the dedendum cannot be completely meshed due to the fact that the radiuses of the addendum and the dedendum on the concentric circle are different. The circular arcs corresponding to the tooth top teeth of the cross section of each screw of the modified three-screw are not circular arcs on concentric circles but circular arcs of non-concentric circles, or the two non-concentric circles corresponding to the tooth tops and the tooth bottoms are two circles with equal radius and same size, so that the circular arcs on the two equal circles can be completely meshed together. Because the two circular arcs of the tooth top and the tooth bottom of the modified three-screw can be completely meshed, high outlet pressure can be achieved at low speed.
4. Material handling principles. The prior art screw pump generally uses oil to carry out pressure propelling movement, because the lubricated effect of oil solution is fine, and prevent that the rust effect is fine, consequently does not have the increase wearability and prevents the rust problem. The invention uses the screw rod for the cutting liquid pump with 95% water, although the outlet pressure of the pump can be improved to a great extent, the viscosity of water is very low, unlike the high viscosity of oil, and the oil has lubricating effect and anti-rusting effect, so the screw rod is more seriously worn when being conveyed by water than when being conveyed by oil, and is easy to rust, and if the two problems of wear resistance and rust prevention can not be solved, the service life of the screw rod cutting liquid pump can be influenced. The present invention adopts a method for material processing, first, an alloy material is adopted instead of a pure steel material, and the alloy material is a rust-proof alloy material instead of a general alloy material. Secondly, the material is subjected to heat treatment, so that the hardness is enhanced, and the material is more wear-resistant.
Based on the principle, the invention designs the three-screw labyrinth seal cutting fluid pump.
A three-screw labyrinth seal cutting fluid pump is shown in figure 1, figure 2 and figure 3, and comprises end covers at two ends and a middle shell, wherein one end of the end cover at the two ends is a universal flange end cover 1 connected with a motor, the other end of the end cover at the two ends is a radial oil absorption end cover 3 far away from the motor, a shell 2 is arranged between the universal flange end cover 1 and the radial oil absorption end cover 3, a rotating shaft is axially distributed at the center of the shell, one end of the surface of the shell 2, which is close to the universal flange end cover, is provided with an oil outlet 2-3 (: the cutting fluid is cutting fluid of 95% water and 5% oil, a rotating shaft arranged in the center of the shell along the axial direction is a modified three-screw rotor, a lengthened labyrinth seal groove 5-1-1 is arranged on a driving screw 5-1 of the modified three-screw rotor, and a labyrinth seal flange end cover 4 matched with the lengthened labyrinth seal groove 5-1-1 is arranged between the universal flange end cover 1 and the shell 2.
As shown in fig. 4 and 5, the modified three-screw rotor comprises a main screw 5-1 in the middle and slave screws (5-2, 5-3) at two sides, wherein the diameter of the main screw 5-1 is larger than that of the slave screws (5-2, 5-3); the circular arcs of the tooth crest and the tooth root of each tooth of the cross section of the profile modification three-screw are two circular arcs which can be completely meshed, and the circle centers of the two completely meshed circular arcs are not concentric with the circle center of the gear; the circle centers of the tooth tops and the tooth roots of the cross sections of the three screw rods of the modified helical gear can be arranged at positions smaller than the radius of the gear as required, and two circular lines corresponding to respective circular arcs of the tooth tops and the tooth roots are the same.
The shape-correcting three-screw adopts anti-rusting alloy materials, and is subjected to heat treatment and wear resistance.
As shown in fig. 5 and 6, the labyrinth seal flange end cover 4 is sleeved on an outer ring (5-1-1 in fig. 5) of the lengthened labyrinth seal groove of the main screw, and the position and the length of the lengthened labyrinth seal groove 5-1-1 on the main screw 5-1 are matched with the position and the length of the labyrinth seal flange end cover 4 on the main screw;
as shown in fig. 7 and 8, the labyrinth seal flange end cover is provided with a large outer diameter 4-1 and a small outer diameter 4-2 along the axial direction, and the inner diameters of the large outer diameter and the small outer diameter are the same; as shown in FIG. 6, the large outer diameter portion 4-1 is used to connect with the universal flange end cover 1, and the small outer diameter portion 4-2 is used to extend the labyrinth seal passage.
As shown in FIG. 9, the labyrinth seal large outer diameter portion 4-1 is connected with the universal flange end cover 1 through a bearing 4-1-4 and a bolt 4-1-5, and the bearing 4-1-4 axially and respectively bridges over the bearing steps (1-2 in FIG. 10 and 4-1-1 in FIG. 7) of the universal flange end cover and the labyrinth seal flange end cover which are arranged oppositely.
As shown in fig. 7 and 9, two steps that are recessed from outside to inside along the radius direction are arranged on the end surface where the large outer diameter part 4-1 and the general flange end cover 1 are connected, the first step 4-1-1 that is recessed from small to large along the radius direction of the end surface is a step that has a relatively small diameter and is recessed relatively deeply, and the step is used for installing a bearing 4-3 that connects the labyrinth seal end cover and the general flange end cover; the second step 4-1-2 from small to large along the radius direction of the end face is a step with relatively large diameter and relatively shallow recess, and the step is used for installing an O-shaped sealing ring for connecting the labyrinth sealing end cover and the universal flange end cover.
As shown in fig. 9 and 10, two steps which are from small to large along the radius direction and are recessed from outside to inside are also arranged on the end surface where the general flange end cover 1 and the large outer diameter part 4-1 are connected, the first step 1-1 which is from small to large along the radius direction of the end surface is a step which is relatively small in diameter and recessed relatively deep, and the step is used for installing a framework seal 1-3; the second step 1-2 from small to large along the radius direction of the end face is a step with a relatively large diameter and a relatively shallow recess, and the step is used for installing and connecting a bearing 4-3 of a universal flange end cover and a labyrinth seal end cover.
As shown in fig. 2, 6, 7 and 8, the first step 4-1-1 of the large outer diameter portion 4-1 is further provided with a flow guide hole (4-1-3-1,4-1-3-2) penetrating through two axial end faces of the large outer diameter portion, the flow guide hole is connected with a flow guide pipe (4-1-3-3 in fig. 6) on the end face where the large outer diameter portion and the small outer diameter portion are connected, and one end of the flow guide pipe 4-1-3-3, which is far away from the flow guide hole 4-1-3-2, is connected with a flow guide channel 2-2 (2-2 in fig. 2) of the housing; liquid leaked between the universal flange end cover 1 and the labyrinth seal flange end cover 4 flows back through the guide holes (4-1-3-1,4-1-3-2), the guide pipe 4-1-3-3 and the guide channel 2-2 and is discharged into the radial oil suction cover 3 at the other end of the shell.
As shown in fig. 7 and 8, the flow guiding holes (4-1-3-1,4-1-3-2) penetrating through the two axial end faces of the large outer diameter part are two non-coaxial flow guiding holes obliquely formed, one hole is formed on the radial inner side of the first step 4-1-1 of the large outer diameter part 4-1, and the other hole 4-1-3-2 is formed on the radial outer side, opposite to the first step, of the small outer diameter part connected with the large outer diameter part.
As shown in fig. 4 and 5, the labyrinth seal groove 5-1-1 is a labyrinth seal groove directly machined on the main screw 5-1, and a separate labyrinth seal is not required to be installed on the main screw.
The experimental data of the invention are as follows:
1. the following table is an improvement of the previous experimental data and the table is an improved experimental data.
2. In practical use, in order to achieve a better cooling and lubricating effect and effectively wash away cutting scraps in time, the cutting fluid pump generally requires a pressure of over 70bar, and the higher the pressure is, the better the washing effect is;
3. calibrating the flow: the calibrated flow is close to the flow when the pressure is 0, and the calibrated flow of the meter I and the meter II is 50;
4. ideally, the larger the outlet flow/nominal flow ratio, the better when the pressure reaches a maximum of, for example, 70 bar.
5. Before improvement, when the pressure is 70bar, the outlet flow is 21L/min, and the ratio of the outlet flow to the calibrated flow is 42%, so that the effect is not ideal. Before the improvement: the casing is directly connected with the universal flange end cover, and a special labyrinth seal flange end cover is not arranged.
6. The second table shows improved experimental data, when the pressure is 70, the outlet flow is increased from 21 to 41L/min, the ratio of the outlet flow to the calibration flow is up to 82%, which is increased by nearly one time, and the effect is very obvious.
One, improve the previous experimental data
Note/Note 1. test ISO VG46 lubricating oil was used. 2. At least 7 groups of data are tested, and two groups of data are tested after the overflow valve is opened.
Second, improve the subsequent experimental data
Watch two
It should be emphasized that the described embodiments of the present invention are illustrative rather than limiting and, thus, the present invention includes embodiments that are not limited to those described in the detailed description.
Claims (6)
1. The utility model provides a three screw rod labyrinth seals cutting fluid pump, includes the end cover at both ends and middle casing, and both ends end cover one end is the radial oil absorption end cover of keeping away from the motor for the general flange end cover of connecting the motor, the other end, is the casing between general flange end cover and the radial oil absorption end cover, and the pivot has been laid along the axial at the casing center, and housing face is close to general flange end cover one end and is provided with oil outlet, its characterized in that: the cutting fluid is cutting fluid of 95% of water and 5% of oil, a rotating shaft arranged in the center of the shell along the axial direction is a modified three-screw rotor, a lengthened labyrinth sealing groove is arranged on a main screw of the modified three-screw rotor, and a labyrinth sealing flange end cover matched with the lengthened labyrinth sealing groove is arranged between the universal flange end cover and the shell;
the lengthened labyrinth seal groove on the main screw ensures that the length of the labyrinth seal groove is not limited by the thickness of the universal flange end cover, so that the length of the labyrinth seal groove is designed according to needs, the total length of the labyrinth seal groove can be doubled, and the resistance of liquid leakage along the main screw is doubled;
the labyrinth seal flange end cover is sleeved on the outer ring of the lengthened labyrinth seal groove of the main screw, and the position and the length of the lengthened labyrinth seal groove on the main screw are matched with the position and the length of the labyrinth seal flange end cover on the main screw; the labyrinth seal flange end cover is provided with a large outer diameter part and a small outer diameter part along the axial direction, and the inner diameters of the large outer diameter part and the small outer diameter part are the same; the large outer diameter part is used for connecting with a universal flange end cover, and the small outer diameter part is used for prolonging a labyrinth seal channel;
the end face of the large outer diameter part connected with the universal flange end cover is provided with two steps which are from small to large along the radius direction and are sunken from outside to inside, the first step which is from small to large along the radius direction of the end face is a step with relatively small diameter and relatively deep sunken, and the step is used for installing a bearing for connecting the labyrinth seal end cover and the universal flange end cover; the second step from small to large along the radius direction of the end face is a step with relatively large diameter and relatively shallow recess, and the step is used for installing an O-shaped sealing ring for connecting the labyrinth sealing end cover and the universal flange end cover;
the first step of the large outer diameter part is also provided with a flow guide hole penetrating through two axial end faces of the large outer diameter part, the flow guide hole is connected with a flow guide pipe on the end face where the large outer diameter part is connected with the small outer diameter part, and one end of the flow guide pipe, which is far away from the connected end face, is connected with a flow guide channel of the shell; liquid leaked between the universal flange end cover and the labyrinth seal flange end cover is discharged into a radial oil suction cover at the end part of the shell through the flow guide holes, the flow guide pipe and the flow guide channel in a backflow mode;
the flow guide holes penetrating through two axial end faces of the large-outer-diameter part are two flow guide holes which are obliquely formed in a non-coaxial mode, one flow guide hole is formed in the radial inner side of the first step of the large-outer-diameter part, and the other flow guide hole is formed in the radial outer side, opposite to the first step, of the small-outer-diameter part connected with the large-outer-diameter part.
2. The three-screw labyrinth seal cutting fluid pump according to claim 1, characterized in that: the modified three-screw rotor comprises a main screw in the middle and slave screws on two sides, and the diameter of the main screw is larger than that of the slave screws; the circular arcs of the tooth crest and the tooth root of each tooth of the cross section of the modified three-screw rotor are two circular arcs capable of being completely meshed.
3. The three-screw labyrinth seal cutting fluid pump according to claim 1, characterized in that: the modified three-screw rotor is made of an antirust alloy material, and is subjected to heat treatment and wear resistance.
4. The three-screw labyrinth seal cutting fluid pump according to claim 1, characterized in that: the large-outer-diameter part of the labyrinth seal flange end cover is connected with the universal flange end cover through a bearing and a screw, and the bearing is axially and respectively bridged on the respective bearing steps of the universal flange end cover and the labyrinth seal flange end cover which are arranged oppositely.
5. The three-screw labyrinth seal cutting fluid pump according to claim 1, characterized in that: the end face of the universal flange end cover connected with the large-outer-diameter part is also provided with two steps which are from small to large along the radius direction and are sunken from outside to inside, the first step which is from small to large along the radius direction of the end face is a step with a relatively small diameter and a relatively deep sunken part, and the step is used for installing framework sealing; the second step from small to large along the radius direction of the end face is a step with relatively large diameter and relatively shallow recess, and the step is used for installing and connecting a bearing of the universal flange end cover and the labyrinth seal end cover.
6. The three-screw labyrinth seal cutting fluid pump according to claim 1, characterized in that: the labyrinth seal groove is directly machined on the main screw rod, and a separate labyrinth seal is not arranged on the main screw rod.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2811603Y (en) * | 2005-07-11 | 2006-08-30 | 天津泵业机械集团有限公司 | High pressure three-screw pump |
| CN203685559U (en) * | 2013-11-28 | 2014-07-02 | 天津泵业机械集团有限公司 | High-pressure three-screw pump of hydraulic control system for ships |
| CN203655618U (en) * | 2013-12-19 | 2014-06-18 | 黄山工业泵制造有限公司 | High-performance high-pressure three-screw pump |
| CN105240271B (en) * | 2015-10-13 | 2017-08-29 | 繁昌县金科机电科技有限公司 | A kind of three screw pump bushing |
| CN106122000A (en) * | 2016-08-26 | 2016-11-16 | 黄山艾肯机械制造有限公司 | A kind of screw pump assembly of hydro-cushion |
| CN106194719A (en) * | 2016-08-26 | 2016-12-07 | 黄山艾肯机械制造有限公司 | A kind of screw pump of low viscosity high pressure |
-
2019
- 2019-01-12 CN CN201910029034.6A patent/CN109854497B/en active Active
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| CN109854497A (en) | 2019-06-07 |
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Address after: 301899 No. 1, Tianxing Road, energy conservation and environmental protection industrial zone, Baodi District, Tianjin Patentee after: Hailink hydraulic technology (Tianjin) Co.,Ltd. Address before: 301899 No. 1, Tianxing Road, energy conservation and environmental protection industrial zone, Baodi District, Tianjin Patentee before: JINMAISI HYDRAULIC EQUIPMENT (TIANJIN) CO.,LTD. |
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