CN111140498A - Roots pump capable of effectively reducing noise - Google Patents
Roots pump capable of effectively reducing noise Download PDFInfo
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- CN111140498A CN111140498A CN202010035186.XA CN202010035186A CN111140498A CN 111140498 A CN111140498 A CN 111140498A CN 202010035186 A CN202010035186 A CN 202010035186A CN 111140498 A CN111140498 A CN 111140498A
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- 239000012530 fluid Substances 0.000 claims abstract description 11
- 230000009467 reduction Effects 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 10
- 230000001360 synchronised effect Effects 0.000 description 8
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 238000013459 approach Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000003584 silencer Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/06—Silencing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/20—Rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/30—Casings or housings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention relates to the technical field of Roots pumps, and aims to provide a Roots pump capable of effectively reducing noise, which has the technical scheme that: the high-pressure gas return device comprises a shell A, wherein a return groove A is formed in the inner wall of an 8-shaped cylinder of the shell A, the shape and the area of a flow passage of the return groove A are designed according to the fluid mechanics and thermodynamic rules, and the return speed of high-pressure gas can be controlled by using the return groove A; including casing B and wallboard B, wallboard B is inside to set up the high-pressure gas chamber, the high-pressure gas circulation mouth is seted up towards casing B's side in the high-pressure gas chamber, casing B's high-pressure exhaust chamber both sides wall is seted up the high-pressure gas delivery port, wallboard B offers two backflow groove B that are used for carrying out the buffering to high-pressure backflow gas towards the symmetry on the terminal surface in casing B working chamber, backflow groove B's runner shape and area design according to hydrodynamics and thermodynamic law, utilize backflow groove B's runner shape and area control high-pressure gas backflow speed. The invention can effectively slow down the backflow impact of high-pressure gas and reduce the noise of the pump.
Description
Technical Field
The invention relates to the technical field of roots pumps, in particular to a roots pump capable of effectively reducing noise.
Background
The roots pump is a positive displacement pump, and compresses and conveys gas by using the relative motion of two blade-shaped conjugated rotors in a working cavity. Because each impeller adopts an involute, a cycloid or a circular envelope curve, and the profile lines of each impeller are completely the same, the processing complexity of the impellers can be greatly reduced. When the impeller is processed by adopting numerical control equipment, the two impeller-shaped surfaces can keep a certain small gap when the two impellers rotate to any position on the premise of ensuring that the center distance of the two impellers is not changed, so that the effects of effectively controlling the high-pressure gas in the high-pressure cavity to leak and ensuring the high-efficiency and stable operation of the roots pump are achieved.
As shown in fig. 1 and 2, the conventional three-vane roots pump includes a main oil tank 14 and an auxiliary oil tank 15, a casing A1 is disposed between the main oil tank 14 and the auxiliary oil tank 15, a working chamber 3 is disposed in the casing A1, a driving impeller coupling 16 and a driven impeller coupling 17 are disposed in the working chamber 3, and a wall plate A2 is disposed at an end of the casing A1 along a length direction of the driving impeller coupling 16. A low pressure air inlet 1001 is provided at one side of the working chamber 3 of the casing A1. External power is input through a coupler at the shaft end of the driving impeller 4, and the driving impeller 4 drives the driven impeller 5 to synchronously rotate through the synchronous gear. The driving impeller 4 includes a first driving impeller crest 41, a second driving impeller crest 42 and a third driving impeller crest 43, and the driven impeller 5 includes a first driven impeller crest 51, a second driven impeller crest 52 and a third driven impeller crest 53. The other side of the working cavity 3 of the casing A1 is provided with a high-pressure exhaust port 31, the outer side of the high-pressure exhaust port 31 is provided with a high-pressure exhaust cavity 6, and the high-pressure exhaust cavity 6 is provided with a high-pressure exhaust port 7.
As shown in fig. 3 and 4, the edge of the low pressure inlet 1001 is set as a ', the position located at 120 ° from the inner wall of the working chamber 3 is set as B', the joint between the inner wall of the working chamber 3 and the high pressure exhaust port 31 is set as C ', and the first driving wheel crest 41 rotates toward the inner wall of the working chamber 3 of the housing A1 and approaches the edge a' of the low pressure inlet 1001, at this time, a nearly closed cavity is formed by the first driving wheel crest 41, the second driving wheel crest 42, the inner wall of the working chamber 3, and the wall plate A2, and the cavity is referred to as the element volume 13. At this time, since the first driving wheel crest 41 is close to the edge a' of the low pressure gas inlet 1001, the gas is blocked from being sucked into the cell volume 13, and the pressure at the cell volume 13 and the low pressure gas inlet 1001 can be considered to be equal.
As shown in fig. 4 and 5, when the first driving wheel crest 41 approaches to the edge a 'of the low pressure air inlet 1001, the second driving wheel crest 42 just approaches to the position located on the inner wall B' of the working chamber 3, and at this time, because the gaps between the second driving wheel crest 42 and the inner wall of the working chamber 3 of the casing A1 and between the end surface of the impeller and the two wall plates a are very small, the leakage of the high pressure gas in the high pressure exhaust chamber 6 into the element volume 13 is not obvious, so the high pressure gas does not cause obvious gas backflow impact on the element volume 13.
As shown in fig. 6 and 7, the driving impeller 4 drives the driven impeller 5 to rotate continuously through the synchronous gear, and drives the air in the elementary volume 13 to move to the high-pressure exhaust port 31. When the second driving wheel blade crest 42 approaches to the position C 'at the junction of the high-pressure exhaust port 31 and the inner wall of the working chamber 3, the second driving wheel continues to rotate, so that the gap between the second driving wheel blade crest 42 and the position C' is rapidly increased, and the element volume 13 is communicated with the high-pressure exhaust port 31. At this time, the high-pressure air in the high-pressure exhaust chamber 6 flows back into the element volume 13 from the rapidly increasing gap, so that the pressure in the element volume 13 is rapidly increased to the pressure in the high-pressure exhaust chamber 6, and therefore, a great impact noise of the back-flowing air is generated, resulting in a great operational noise of the roots pump. Therefore, if the high-pressure gas backflow process in the high-pressure exhaust cavity 6 is enabled to be smooth and stable, the intensity of the high-pressure gas backflow impact can be reduced, and the method is a key point for reducing the running noise of the roots pump. The driving impeller 4 and the driven impeller 5 in the working cavity 3 of the Roots pump are arranged in a conjugate symmetry mode, so that the working principle of the left part and the right part in the working cavity 3 of the Roots pump is the same. With the continuous synchronous conjugate rotation of the driving impeller 4 and the driven impeller 5, the impeller continues to rotate as the high-pressure gas in the high-pressure exhaust cavity 6 flows back to the element volume 13 and is pressurized to the pressure of the high-pressure exhaust cavity 6, the high-pressure gas in the element volume 13 is continuously extruded into the high-pressure exhaust cavity 6, and meanwhile, the low-pressure gas in the low-pressure gas inlet 1001 is continuously sucked into the element volume 13 formed subsequently, so that the continuous pressurization and conveying of the low-pressure gas by the roots pump are realized.
Chinese patent No. CN205446032U discloses a roots pump, which comprises a casing, an air outlet, an air inlet filter, and a silencer, wherein an impeller is installed in the casing, two ends of the impeller are respectively provided with a roller, the impeller is fixedly arranged on a bearing, and a lubricating layer is arranged inside the casing. The air inlet filter is arranged to filter the inlet air, so that the phenomenon that the working noise of the impeller is increased due to excessive dust in the air is reduced; the lubricating layer can reduce the friction loss of the inner wall of the machine shell and prolong the service life of the machine shell.
Although the prior art can reduce air noise by filtering air intake, the problem of high-pressure gas backflow impact of the roots pump is not solved in the actual use process, and the air intake filter and the silencer cannot reduce the noise intensity of a noise source and only can play a role in assisting noise reduction. Therefore, the noise of the roots pump caused by the high-pressure gas backflow impact can be effectively reduced only by reducing the high-pressure gas backflow impact, the impact damage to the interior of the roots pump caused by the high-pressure gas backflow impact is reduced, the service life of the roots pump is prolonged, and the running stability of the roots pump is maintained.
Disclosure of Invention
The invention aims to provide a roots pump capable of effectively reducing noise, which has the advantages of effectively slowing the backflow impact of high-pressure gas and reducing the noise of the roots pump.
The technical purpose of the invention is realized by the following technical scheme:
the Roots pump comprises a casing A and a wallboard A, wherein the casing A comprises an 8-shaped barrel, the 8-shaped barrel of the casing A and the wallboard A are combined to form a working cavity, a low-pressure air inlet is formed in one side of the working cavity, a high-pressure air outlet is formed in the other side of the working cavity, a high-pressure air exhaust cavity is formed in the outer side of the high-pressure air exhaust cavity, a high-pressure air exhaust port is formed in the high-pressure air exhaust cavity, and two identical backflow grooves A for controlling the backflow speed of high-pressure air by utilizing the shape and the area of a flow passage are symmetrically formed in the 8-shaped barrel wall of the casing between the high-pressure air exhaust cavity and the working cavity.
Through adopting above-mentioned technical scheme, after the roots pump starts, the impeller that drives passes through synchronous gear and drives from the impeller synchronous rotation, just rotate when handing-over department to casing work intracavity lateral wall and low pressure air inlet inside wall when first action wheel crest, at this moment, second action wheel crest just rotates the 120 radian scope of sweeping through casing work intracavity lateral wall apart from the low pressure air inlet, here, also the position that the groove A that flows back will open promptly, second action wheel crest continues to rotate, and the groove A that flows back is opened. Because the clearance between the second driving wheel blade crest and the inner wall of the working cavity of the shell is small, the high-pressure gas in the high-pressure gas cavity is forced to reversely flow and pressurize to the element volume through the return flow groove. The second driving impeller crest sweeps through the return groove A at a constant speed along with the continuous rotation of the driving impeller, so that the flow area and the shape of the return groove A force the gas pressure in the element volume to be linearly increased; the pressure variations in the elementary volumes of the working chambers on the other side are similar.
Furthermore, the shape and the area of the flow channel of the return flow channel A accord with the laws of fluid mechanics and thermodynamics, and the area of the flow channel of the return flow channel A is gradually enlarged.
By adopting the technical scheme, when the blade crest of the driving impeller uniformly sweeps the return groove A, the flow passage area of the return groove A is gradually enlarged due to the fact that the flow passage shape of the return groove A is designed according to the fluid mechanics and thermodynamic rules, so that the gas pressure in the element volume is forced to be linearly increased, the impact effect caused by high-pressure gas return is greatly reduced, and the effect of further reducing the noise of the Roots pump is achieved.
Further, the backflow groove A penetrates through the side wall, close to the high-pressure exhaust cavity, of the 8-shaped cylinder body of the machine shell A and is communicated with the high-pressure exhaust cavity, the inner wall of the working cavity of the machine shell A is located at the edge of the air inlet of the low-pressure air inlet, the edge of the air inlet of the low-pressure air inlet is set to be A, the initial edge of the backflow groove A, which is arranged on the inner wall of the working cavity, is set to be B, the end edge of the backflow groove A, which is arranged on the inner wall of the working cavity, is set to be C.
By adopting the technical scheme, when the driving impeller drives the driven impeller to synchronously rotate through the synchronous gear and enables each blade peak of the impeller to rotate and sweep the return flow groove A, the flow area and the shape of the return flow groove A conform to the change of hydrodynamics and thermodynamic laws and are communicated with the high-pressure exhaust cavity, so that the gas pressure in the element volume is further ensured to be linearly increased to the gas pressure in the high-pressure exhaust cavity, and the effect of buffering and noise reduction is finally achieved.
Further, the air inlet edge A and the return flowThe radian included angle between the initial edges B of the groove A arranged on the inner wall of the working cavity is α =
And n is the number of the impeller heads, and an included angle between the edge A of the air inlet and the edge C of the terminal point of the return chute A forms an impeller containing angle with adjustable angle range.
By adopting the technical scheme, the high-pressure gas backflow time can be prolonged by increasing the angle range of the impeller containing angle, and the effect of further reducing the noise of the Roots pump is achieved.
Furthermore, the roots pump capable of effectively reducing noise can further comprise a casing B and a wall plate B, wherein the casing B comprises an 8-shaped cylinder, the 8-shaped cylinder of the casing B and the wall plate B are combined to form a working cavity, one side of the working cavity is provided with a low-pressure air inlet, the edge of the low-pressure air inlet is A, the other side of the working cavity is provided with a high-pressure air outlet, the outer side of the high-pressure air outlet is provided with a high-pressure air exhaust cavity, the high-pressure air exhaust cavity is provided with a high-pressure air exhaust port, a high-pressure gas cavity is arranged in the wall plate B, a high-pressure gas flow port is arranged on the surface of the high-pressure gas cavity corresponding to the high-pressure air exhaust cavity of the casing B, two side walls of the high-pressure air exhaust cavity of the casing B are provided with high-pressure gas guide, two backflow grooves B for controlling the backflow speed of the high-pressure gas by utilizing the shape and the area of the flow channel are symmetrically formed in the end face, facing the working cavity of the shell B, of the wallboard B.
By adopting the technical scheme, after the roots pump is started, the driving impeller coupling drives the driven impeller to synchronously rotate through the synchronous gear, when the vertex of the outer edge of the first driving impeller reaches the position A, the surface of the second driving impeller just shields the backflow groove B and continues to rotate, the backflow groove B is opened, and high-pressure gas in a high-pressure cavity in the wallboard B is inflated into the elementary volume through the backflow groove B on the wallboard B; and (4) the impeller continues to rotate, when the shape surface of the first driving impeller reaches the starting point of the backflow groove B, the pressure in the element volume is equal to or close to the pressure in the high-pressure gas cavity, and the backflow pressure equalizing is finished. The return groove B can also force the gas pressure in the element volume to be linearly increased, thereby greatly reducing the impact strength caused by the high-pressure gas return and reducing the air impact noise.
Furthermore, the shape and the area of the flow channel of the return flow channel B accord with the laws of fluid mechanics and thermodynamics, and the area of the flow channel of the return flow channel B is gradually enlarged.
By adopting the technical scheme, when the shape of the active impeller uniformly sweeps the flow returning groove B, the flow passage area of the flow returning groove B is gradually enlarged due to the fact that the flow passage shape of the flow returning groove B is designed according to the fluid mechanics and thermodynamic rules, so that the gas pressure in the element volume is forced to be linearly increased, the impact effect caused by high-pressure gas backflow is greatly reduced, and the effect of further reducing the noise of the roots pump is achieved.
In conclusion, the invention has the following beneficial effects:
1. the low-pressure air inlet is arranged on one side of the shell working cavity, the 8-shaped cylinder body of the shell A is combined with the wallboard A to form the working cavity, the high-pressure air outlet is formed on the other side of the working cavity, the high-pressure air outlet cavity is arranged on the outer side of the high-pressure air outlet, and the backflow groove A for buffering high-pressure backflow gas is arranged on the 8-shaped cylinder body of the shell between the high-pressure air outlet cavity and the working cavity, so that dynamic impact noise caused by the high-pressure backflow gas on gas in the element volume is reduced, and the effect of effectively reducing the noise of the Roots pump is;
2. designing the shape and the flow area of a return flow groove A according to the fluid mechanics and thermodynamic laws, enabling the return flow groove A to penetrate through the side wall of a working cavity of a shell A and be communicated with a high-pressure exhaust cavity, enabling the bottom of the return flow groove A to be communicated with a high-pressure exhaust port, enabling the radian included angle between an air inlet edge A and an initial edge B of the return flow groove A, which is formed on the inner wall of the working cavity, to be 120 degrees, and increasing the included angle by enabling the air inlet edge A to move forwards and enabling an end point C of the return flow groove A to move backwards so as to prolong the return flow time of high-pressure gas and achieve the effect of further;
3. through at the inside high-pressure gas chamber that sets up of wallboard B, the high-pressure gas chamber is provided with high-pressure gas circulation mouth towards one side of casing B, and high-pressure gas exports have been seted up to casing B's high-pressure exhaust chamber both sides wall, and high-pressure gas exports the high-pressure gas intracavity that leads casing B's high-pressure exhaust intracavity high-pressure gas to wallboard B, and wallboard B offers two backflow groove B that are used for carrying out the buffering to high-pressure backflow gas towards the symmetry on the terminal surface of casing B working chamber one side. When the vertex of the outer edge of the first driving impeller reaches the position A, the end surface shape of the second driving impeller just covers the backflow groove B, the second driving impeller continues rotating, the backflow groove B is opened, high-pressure gas is inflated into the element volume through the backflow groove B on the wallboard B, the impeller continues rotating, when the end surface shape of the first driving impeller reaches the starting point of the backflow groove B, at the moment, the pressure in the element volume is equal to or close to the pressure in the high-pressure gas cavity, and at the moment, backflow pressure equalization is finished. The flow channel shape of the return flow groove B is designed according to the fluid mechanics and thermodynamic law, and the flow area and the shape of the return flow groove B force the gas pressure in the element volume to be linearly increased, so that the impact strength caused by high-pressure gas return flow is greatly reduced, and the air impact noise is reduced.
Drawings
FIG. 1 is a general cross-sectional view of a prior art roots pump;
FIG. 2 is a sectional view of a prior art pump casing for embodying the positional relationship of a driving impeller and a driven impeller in the prior art Roots pump casing;
FIG. 3 is a sectional view of a prior art for showing the initial starting state position relationship between a driving impeller and a driven impeller;
FIG. 4 is a cross-sectional view showing the relationship between the initial positions of the volumes of the working chambers of the Roots pump in the prior art;
FIG. 5 is a sectional view showing the internal structure of the working chamber when the element volume in the working chamber of the Roots pump is completely formed in the background art;
FIG. 6 is a cross-sectional view showing the relationship between the internal structure of the working chamber when the high-pressure gas backflow phenomenon occurs in the working chamber in the prior art;
FIG. 7 is a sectional view showing the relationship between the internal structure of the working chamber in the extreme state of the backflow effect of the high-pressure gas in the working chamber of the roots pump in the background art;
FIG. 8 is a sectional view showing the positional relationship between the driving impeller and the driven impeller and the return grooves A in example 1;
fig. 9 is an overall schematic view for showing the positional relationship between the return flow groove a and the inner wall of the casing a in embodiment 1;
FIG. 10 is a sectional view showing the shape of the flow path of the return flow groove A in embodiment 1;
FIG. 11 is a sectional view showing the positional relationship between a return flow groove A and an 8-shaped cylinder in example 1;
FIG. 12 is a schematic view showing the positional relationship between the return chute B and the wall panel B in example 2;
FIG. 13 is a sectional view showing the positional relationship between the driving impeller and the driven impeller and the return grooves B in example 2;
figure 14 is a cross-sectional view of embodiment 2 showing the location of the high pressure gas chamber in wall panel B.
In the figure, 1, a casing A; 1001. a low pressure air inlet; 2. a wallboard A; 3. a working chamber; 31. a high pressure vent; 4. a driving impeller; 41. a first driving wheel crest; 42. a second driving wheel crest; 43. a third driving wheel crest; 5. a driven impeller; 51. a first driven wheel lobe; 52. a second driven wheel lobe peak; 53. a third driven wheel lobe peak; 6. a high pressure exhaust chamber; 7. a high pressure exhaust port; 8. a return chute A; 9. a case B; 91. a high-pressure gas outlet; 10. a wallboard B; 101. a return chute B; 11. a high pressure gas chamber; 12. a high pressure gas flow port; 13. a cell volume; 14. a main oil tank; 15. a secondary fuel tank; 16. a driving impeller coupling; 17. a driven impeller coupling; 18. an 8-shaped cylinder body.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
a Roots pump capable of effectively reducing noise comprises a casing A1, wherein the casing A1 comprises an 8-shaped cylinder 18 and a low-pressure air inlet 1001 integrally formed on one side of the 8-shaped cylinder 18, a working chamber 3 is formed by the casing A1 and wall plates A2 (shown in figure 1) arranged on two sides of the casing A1, a pair of blade-type conjugate driving impellers 4 and driven impellers 5 are arranged in the working chamber 3, and the driving impellers 4 drive the driven impellers 5 to synchronously rotate through synchronous gears. The driving impeller 4 includes a first driving impeller crest 41, a second driving impeller crest 42 and a third driving impeller crest 43, and the driven impeller 5 includes a first driven impeller crest 51, a second driven impeller crest 52 and a third driven impeller crest 53.
As shown in fig. 8 and 9, a high-pressure exhaust port 31 is opened at one side of the working chamber 3 of the housing A1, a high-pressure exhaust chamber 6 is provided outside the high-pressure exhaust port 31, and the high-pressure exhaust chamber 6 is provided with a high-pressure exhaust port 7. The 8-shaped cylinder 18 of the casing A1 between the high-pressure exhaust cavity 6 and the working cavity 3 is provided with a backflow groove A8 for buffering high-pressure backflow gas, the shape and the area of a flow passage of the backflow groove A8 are designed according to the fluid mechanics and thermodynamic rules, the area of the backflow groove A8 is gradually increased, and the backflow speed of the high-pressure gas is controlled by using the shape and the area of the flow passage of the backflow groove A8.
As shown in fig. 8 and 9, the backflow groove A8 penetrates through the side wall of the "8" -shaped cylinder 18 of the casing A1 and is communicated with the high-pressure exhaust chamber 6, the edge of the air inlet of the inner wall of the working chamber 3 of the casing A1, which is located at the low-pressure air inlet 1001, is set as a, the initial edge of the backflow groove A8, which is opened on the inner wall of the working chamber 3, is set as B, the terminal edge of the backflow groove A8, which is opened on the inner wall of the working chamber 3, is set as C, the terminal edge C of the backflow groove A8 is communicated with the high-pressure exhaust chamber 6, the radian included angle between the air inlet edge a and the initial edge B of the backflow groove A8, which is opened on the inner wall of the working chamber 3, is α = (360 °)/n, n is the number of impeller heads, the included angle between the air inlet edge a and the terminal edge C of the backflow groove A8 forms an impeller containing angle, the air inlet edge a can move forward, the terminal edge C of.
As shown in fig. 10 and 11, the return groove A8 penetrates the side wall of the working chamber 3 of the casing A1 and communicates with the high-pressure exhaust chamber 6, and the bottom of the return groove A8 communicates with the high-pressure exhaust port 31.
Example 2:
a Roots pump capable of effectively reducing noise comprises a machine shell B9 and a wall plate B10, wherein an 8-shaped cylinder 18 of the machine shell B9 and the wall plate B10 are combined to form a working cavity 3, a low-pressure air inlet 1001 is arranged on one side of the working cavity 3, the edge of the low-pressure air inlet 1001 is A, a high-pressure air outlet 31 is arranged on the other side of the working cavity 3, a high-pressure air exhaust cavity 6 is arranged on the outer side of the high-pressure air outlet 31, and a high-pressure air exhaust port 7 is arranged in the high-pressure air exhaust cavity 6.
As shown in fig. 12 and 14, a high-pressure gas cavity 11 is formed inside the wall plate B10, a high-pressure gas flow port 12 is formed in a side surface of the high-pressure gas cavity 11 facing the cabinet B9, high-pressure gas outlet holes 91 are formed in two side walls of the high-pressure exhaust cavity 6 of the cabinet B9, and the high-pressure gas outlet holes 91 are used for guiding high-pressure gas in the high-pressure exhaust cavity 6 of the cabinet B9 out of the high-pressure gas cavity 11 of the wall plate B10; two backflow grooves B101 used for buffering high-pressure backflow gas are symmetrically formed in the end face, facing the working cavity 3 of the shell B9, of the wall plate B10, the flow channel shape and the area of the backflow grooves B101 are designed according to the fluid mechanics and thermodynamic rules, the area of the backflow grooves B101 is gradually increased, and the backflow speed of the high-pressure gas is controlled by means of the flow channel shape and the area of the backflow grooves B101.
In example 1 and example 2, according to the ideal gas stagnation state adiabatic isentropic flow state equation:
wherein k is a gas constant,
where, Mach number of the airflow on the cross section, u is the airflow speed on the flow channel, a is the local sonic speed, and M =1 is the dividing point of the supersonic flow and the subsonic flow in the flow channel. When the M =1, the signal strength of the signal is high,
for air k =1.4,
1.892929, the Roots pump is used under the standard state of atmosphere,
=1.892929
=1.892929
101.325kPa=191.80 kPa。
when the output pressure of the roots pump is higher than 191.80 kPa, the high-pressure gas in the high-pressure exhaust cavity 6 and the high-pressure gas cavity 11 flows back into the element volume 13 from the return port of the return groove A8 or the return groove B101, at this time, supersonic flow occurs at the return port of the return groove A8 or the return groove B101, subsonic flow occurs at the return port of the return groove B101 and below 191.80 kPa, and the flow channel calculation of the return groove A8 and the return groove B101 is respectively calculated according to two states of supersonic flow and subsonic flow.
The present patent application also applies to negative pressure roots pumps, and the present embodiment is only for explanation and not for limitation of the present invention, and those skilled in the art can make modifications to the present embodiment as needed without inventive contribution after reading the present specification, but only protected by the patent laws within the scope of the claims of the present invention.
Claims (6)
1. The utility model provides an effective roots pump of making an uproar that falls, includes casing A (1) and wallboard A (2), its characterized in that: casing A (1) is including "8" font barrel (18), the combination of "8" font barrel (18) and wallboard A (2) of casing A (1) forms working chamber (3), one side of working chamber (3) is provided with low pressure air inlet (1001), the opposite side of working chamber (3) is provided with high-pressure gas vent (31), the outside of high-pressure gas vent (31) is provided with high-pressure exhaust chamber (6), high-pressure exhaust chamber (6) are provided with high-pressure exhaust port (7), are located two the same flowback groove A (8) that utilize runner shape and area control high-pressure gas velocity of flow that returns are seted up to the symmetry on casing "8" font barrel (18) wall between high-pressure exhaust chamber (6) and working chamber (3).
2. An effective noise-reducing roots pump as set forth in claim 1, wherein: the shape and the area of the flow channel of the return flow channel A (8) accord with the laws of fluid mechanics and thermodynamics, and the flow channel area of the return flow channel A (8) is gradually enlarged.
3. An effective noise-reducing roots pump as set forth in claim 1, wherein: return chute A (8) run through set up in the lateral wall that "8" font barrel (18) of casing A (1) are close to high-pressure exhaust chamber (6) and communicate with each other with high-pressure exhaust chamber (6), casing A (1) working chamber (3) inner wall is located the air inlet border of low pressure air inlet (1001) is established to A, the initial border that return chute A (8) was seted up on working chamber (3) inner wall is established to B, the terminal border that return chute A (8) was seted up on working chamber (3) inner wall is established to C, the terminal border C and the high-pressure exhaust chamber (6) intercommunication of return chute A (8).
4. An effective noise reduction roots pump according to claim 3, wherein the radian included angle between the air inlet edge A and the initial edge B of the return groove A (8) on the inner wall of the working chamber (3) is α = (360 °)/n, n is the number of impeller heads, and the included angle between the air inlet edge A and the final edge C of the return groove A (8) forms an impeller containing angle with adjustable angle range.
5. An effective noise-reducing roots pump as set forth in claim 1, further comprising a housing B (9) and a wall plate B (10), wherein: the casing B (9) comprises an 8-shaped cylinder body (18), the 8-shaped cylinder body (18) of the casing B (9) is combined with a wallboard B (10) to form a working cavity (3), one side of the working cavity (3) is provided with a low-pressure air inlet (1001), the edge of the low-pressure air inlet (1001) is set to be A, the other side of the working cavity (3) is provided with a high-pressure air exhaust port (31), the outer side of the high-pressure air exhaust port (31) is provided with a high-pressure air exhaust cavity (6), the high-pressure air exhaust cavity (6) is provided with a high-pressure air exhaust port (7), a high-pressure gas cavity (11) is arranged inside the wallboard B (10), a high-pressure gas flow opening (12) is arranged on the surface, corresponding to the high-pressure air exhaust cavity (6) of the casing B (9), the high-pressure gas exhaust cavity (6) of the casing B, high-pressure gas exports (91) and is used for exporting high-pressure gas chamber (11) in wallboard B (10) with high-pressure exhaust chamber (6) of casing B (9), wallboard B (10) are equipped with two back flow groove B (101) that utilize runner shape and area control high-pressure gas to flow back speed towards a side terminal surface of casing B (9) working chamber (3) symmetry.
6. An effective noise-reducing roots pump as set forth in claim 5, wherein: the shape and the area of the flow channel of the return flow channel B (101) accord with the laws of fluid mechanics and thermodynamics, and the area of the flow channel of the return flow channel B (101) is gradually enlarged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035186.XA CN111140498A (en) | 2020-01-14 | 2020-01-14 | Roots pump capable of effectively reducing noise |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035186.XA CN111140498A (en) | 2020-01-14 | 2020-01-14 | Roots pump capable of effectively reducing noise |
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| CN111140498A true CN111140498A (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010035186.XA Pending CN111140498A (en) | 2020-01-14 | 2020-01-14 | Roots pump capable of effectively reducing noise |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114151332A (en) * | 2020-09-07 | 2022-03-08 | 南通兴国通用机械有限公司 | Roots pump of making an uproar falls against current |
| CN116576109A (en) * | 2023-06-05 | 2023-08-11 | 烟台东德实业有限公司 | Hydrogen circulating pump for fuel cell |
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| JPH03124986A (en) * | 1989-10-11 | 1991-05-28 | Anlet Co Ltd | Noise reducing device for roots type blower |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114151332A (en) * | 2020-09-07 | 2022-03-08 | 南通兴国通用机械有限公司 | Roots pump of making an uproar falls against current |
| CN116576109A (en) * | 2023-06-05 | 2023-08-11 | 烟台东德实业有限公司 | Hydrogen circulating pump for fuel cell |
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