CN206246362U - A kind of screw arbor assembly of screw vacuum pump - Google Patents
A kind of screw arbor assembly of screw vacuum pump Download PDFInfo
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- CN206246362U CN206246362U CN201621313113.8U CN201621313113U CN206246362U CN 206246362 U CN206246362 U CN 206246362U CN 201621313113 U CN201621313113 U CN 201621313113U CN 206246362 U CN206246362 U CN 206246362U
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Abstract
The utility model provides a kind of screw arbor assembly of screw vacuum pump, belongs to vacuum pump technology field.It solves the relatively low technical problem of service life of screw rod in the screw arbor assembly of existing screw vacuum pump.The screw arbor assembly of this screw vacuum pump includes that two profiles are identical, oppositely oriented screw rod, the profile of screw rod is by one section of outside circle segmental arc being sequentially connected, one section of cycloid section, one section of root circle section, one section of arc and one section of camber line envelope line segment composition, seamlessly transitted by arc transition section between outside circle segmental arc and cycloid section, arc is the circular arc line of indent, arc is seamlessly transitted with root circle section, camber line envelope line segment is the camber line of evagination, arc is seamlessly transitted with camber line envelope line segment, camber line envelope line segment is seamlessly transitted with outside circle segmental arc, arc on wherein one screw rod is conjugated with the camber line envelope line segment on another screw rod.The utility model has the advantages that the service life for improving screw rod.
Description
Technical field
The utility model belongs to vaccum pump unit technical field, is related to a kind of screw arbor assembly of screw vacuum pump.
Background technology
Screw vacuum pump is to make air-breathing and the exhaust that synchronous high-speed is reversely rotated and produced in pump case using a pair of screw rods
The air-extractor of effect, it is the renewal product of oil sealing vacuum pump, can extract and contain a large amount of water vapours and a small amount of dust
Gas occasion, major pharmacy and chemical enterprise are used widely at home.
The key technology of screw vacuum pump is intermeshing screw rod, and intermeshing screw rod key is profile, spiral shell
The flank of tooth of the profile of bar, i.e. rotor and the section line of rotor axis vertical plane；Profile directly influences screw vacuum
The performance of pump, such as sealing, efficiency, area utilization factor, while determining the processing and manufacturing cost of pump.
Chinese patent literature discloses a kind of Twin-screw vacuum pump molded lines of rotor and its method for designing【Authorization Notice No.
CN102979731B】, molded lines of rotor by point gearing cycloid, point gearing epicycloid, tooth root circular arc, class Archimedes spiral, class Ah
Conjugation envelope and the addendum circle arc composition of base Mead helical.Between point gearing cycloid and addendum circle arc in the patent and point
Engagement cycloid and point gearing epicycloid be it is non-seamlessly transit, with cusp, the structure cause screw rod processing when difficulty it is larger,
Cause not easy processing；Air-flow is more serious to screw rod erosive wear when in use simultaneously, causes the service life of screw rod relatively low.
The content of the invention
The purpose of this utility model is directed to existing technology and there is above mentioned problem, it is proposed that a kind of spiral shell of screw vacuum pump
Bar assembly, the technical problem that the utility model is solved is to ensure to cause spiral shell in the case that two screw rods can realize correct engagement
Bar is easy to process and improves the service life of screw rod.
The purpose of this utility model can be realized by following technical proposal：
A kind of screw arbor assembly of screw vacuum pump, including identical, the oppositely oriented screw rod of two profiles, the screw rod
Profile by the one section of outside circle segmental arc, one section of cycloid section, one section of root circle section, one section of arc and one section that are sequentially connected
Camber line envelope line segment is constituted, it is characterised in that seamlessly transitted by arc transition section between the outside circle segmental arc and cycloid section,
The arc is the circular arc line of indent, and the arc is seamlessly transitted with root circle section, and the camber line envelope line segment is evagination
Camber line, the arc seamlessly transitted with camber line envelope line segment, and the camber line envelope line segment is seamlessly transitted with outside circle segmental arc,
Arc on wherein one screw rod is conjugated with the camber line envelope line segment on another screw rod.
Correct engagement can be realized in incorgruous synchronous rotary using two screw rods of above-mentioned profile, it is ensured that screw rod is true
The normal operation of empty pump；Specifically, camber line envelope when rotated on wherein one arc of screw rod and another screw rod
Line segment is engaged, wherein a camber line envelope line segment for screw rod is engaged with the arc on another screw rod, wherein screw rod
Root circle section engage with the outside circle segmental arc on another screw rod, wherein the circle on the cycloid section of screw rod and another screw rod
Arc changeover portion is engaged, wherein an arc transition section for screw rod is engaged with the cycloid section on another screw rod, wherein a screw rod
Outside circle segmental arc with another screw rod root circle section engage；Each section of the profile of screw rod is and seamlessly transits, without point
Point so that easy to process；Being seamlessly transitted between each face of screw rotor when in use can improve screw rotor erosive wear resistant
Ability, and then improve the service life of screw rod.
In the screw arbor assembly of above-mentioned screw vacuum pump, the curvature of the camber line envelope line segment from outside circle segmental arc phase
One end even increases to the other end.The structure of camber line envelope line segment can guarantee that two screw rods can be realized just in incorgruous synchronous rotary
True engagement.
In the screw arbor assembly of above-mentioned screw vacuum pump, the equation of the camber line envelope line segment is：R is the radius of arc in formula, and b is the center of circle to profile center of arc
Distance；Ro is pitch circle, and the size of Ro is Ro=(Rn+Rm)/2, and wherein Rm is the radius of outside circle segmental arc, and Rn is root circle section
Radius；T1 is variable, and span t1 ∈ [0, β] of t1, β are the corresponding central angle of camber line envelope line segment, the span of β
It is β ∈ [π/8, π/4]；θ is the dependent variable with t1 as variable, and relational expression is:Tg θ=(b sin 2t1-Ro sin t1)/(b
cos 2t1-Ro cos t1).Above-mentioned camber line envelope line segment can guarantee that two screw rods can be realized correctly in incorgruous synchronous rotary
Engagement；Cause that camber line envelope line segment is seamlessly transitted with arc and outside circle segmental arc simultaneously so that screw rod is easy to process and carries
Screw rod service life high.
In the screw arbor assembly of above-mentioned screw vacuum pump, the side apart from b in the center of circle of arc to profile center
Formula is：B=(Ro2-Rn2)/(2Rocosβ-2Rn).The center of circle of the arc can guarantee that two with the distance at profile center
Screw rod can realize correct engagement in incorgruous synchronous rotary.
In the screw arbor assembly of above-mentioned screw vacuum pump, the equation of the radius r of arc is：R=b-Rn.The camber line
The radius of section can guarantee that two screw rods can realize correct engagement in incorgruous synchronous rotary.
In the screw arbor assembly of above-mentioned screw vacuum pump, the equation of the arc is：T2 is variable, the value model of t2 in formula
Enclose t2 ∈ [0, acos ((r2+b2-Ro2)/2rb)].The corresponding central angle of arc and the corresponding central angle phase of camber line envelope line segment
Together.Above-mentioned arc can guarantee that two screw rods can realize correct engagement in incorgruous synchronous rotary；Simultaneously cause arc with
Camber line envelope line segment and root circle section are seamlessly transitted so that screw rod is easy to process and improves screw rod service life.
In the screw arbor assembly of above-mentioned screw vacuum pump, the equation of the root circle section is：
T3 is variable, the span t3 ∈ [0, π-β] of t3 in formula.Above-mentioned root circle section and arc and camber line envelope line segment phase
Match somebody with somebody, it is ensured that two screw rods can realize correct engagement in incorgruous synchronous rotary；Cause that root circle section is smoothed with arc simultaneously
Transition so that screw rod is easy to process and improves screw rod service life.
In the screw arbor assembly of above-mentioned screw vacuum pump, the equation of the outside circle segmental arc is：
In formula：T4 is variable, the span t4 ∈ [0, π-β] of t4.Above-mentioned outside circle segmental arc and arc and camber line envelope line segment
Match, it is ensured that two screw rods can realize correct engagement in incorgruous synchronous rotary；Outside circle segmental arc and camber line are caused simultaneously
Envelope line segment is seamlessly transitted so that screw rod is easy to process and improves screw rod service life.
In the screw arbor assembly of above-mentioned screw vacuum pump, the equation of the cycloid section is：T5 is variable, span t5 ∈ [0, acos in formula
(Ro/Rm)].Above-mentioned cycloid section matches with arc and camber line envelope line segment, it is ensured that two screw rods are in incorgruous synchronous rotary
When can realize correct engagement；Cause that outside circle segmental arc is seamlessly transitted with camber line envelope line segment simultaneously so that screw rod is easy to process
And improve screw rod service life
In the screw arbor assembly of above-mentioned screw vacuum pump, the radius of the arc transition section is 0~0.2mm.It is full
Cycloid section engagement on foot condition arc transition Duan Nengyu correspondence screw rods, and cause that outside circle segmental arc is smoothed with root circle section
Cross so that screw rod is easy to process and improves screw rod service life.
Compared with prior art, the screw arbor assembly of this screw vacuum pump has so that two screw rods are in incorgruous synchronous rotary
Correct engagement can be realized；Each section of the profile of screw rod is and seamlessly transits, have the advantages that it is easy to process, while screw rod turn
Sub- erosive wear resistant so that screw rod has the advantages that the service life of screw rod.
Brief description of the drawings
Fig. 1 is partial schematic sectional view when two screw rods are engaged in this screw arbor assembly.
Fig. 2 is the structural representation of the molded lines of rotor of this screw arbor assembly.
Fig. 3 is the mplifying structure schematic diagram in A portions in Fig. 2.
Fig. 4 is the schematic diagram of β spans arc and camber line envelope line segment excursion at β ∈ [22.5 °, 45 °].
Fig. 5 is the state diagram that two screw rods often rotate different angles at 15 °.
In figure, 1, screw rod；2nd, outside circle segmental arc；3rd, cycloid section；4th, root circle section；5th, arc；6th, camber line envelope line segment；
7th, arc transition section.
Specific embodiment
The following is specific embodiment of the utility model and with reference to accompanying drawing, further is made to the technical solution of the utility model
Description, but the utility model is not limited to these embodiments.
As shown in Figure 1 to Figure 3, the screw arbor assembly of screw vacuum pump includes identical, the oppositely oriented spiral shell of two profiles
Bar 1, the profile of screw rod 1 is by 2, one section of one section of outside circle segmental arc, 3, one section of cycloid section, 4, one section of the root circle section that is sequentially connected
Arc 5 and one section of camber line envelope line segment 6 are constituted, smoothed by arc transition section 7 between outside circle segmental arc 2 and cycloid section 3
Cross, the radius of arc transition section 7 is 0~0.2mm, preferably, the radius of arc transition section 7 for 0.05mm or
0.1mm or 0.15mm；Arc 5 is the circular arc line of indent, and arc 5 is seamlessly transitted with root circle section 4, camber line envelope line segment
6 is the camber line of evagination, and the curvature of camber line envelope line segment 6 increases from the one end being connected with outside circle segmental arc 2 to the other end, arc
5 are seamlessly transitted with camber line envelope line segment 6, and camber line envelope line segment 6 is seamlessly transitted with outside circle segmental arc 2, wherein on a screw rod 1
Arc 5 is conjugated with the camber line envelope line segment 6 on another screw rod 1.
The equation of camber line envelope line segment 6 is：R is the half of arc 5 in formula
Footpath, the size of r is r=b-Rn；B is the center of circle of arc 5 to the distance at profile center, and the size of b is b=(Ro2-
Rn2)/(2Rocosβ-2Rn)；Ro is pitch circle, and the size of Ro is Ro=(Rn+Rm)/2, and wherein Rm is the half of outside circle segmental arc 2
Footpath, Rn is the radius of root circle section 4；T1 is variable, and span t1 ∈ [0, β] of t1, β are that camber line envelope line segment 6 is corresponding
Central angle, the span of β is β ∈ [π/8, π/4]；θ is the dependent variable with t1 as variable, and relational expression is：Tg θ=(b sin
2t1-Ro sin t1)/(b cos 2t1-Ro cos t1).As shown in figure 4, when the value of β is smaller, the radius of arc 5
Smaller, the distance at the center of circle to the profile center of arc 5 is also smaller, and the relative indent degree of arc 5 is larger, β's
When value is larger, the radius of arc 5 is larger, also larger, the relative arc of the distance at the center of circle to the profile center of arc 5
The indent degree of line segment 5 is smaller.
The equation of arc 5 is：
T2 is variable, t2 in formula
Span t2 ∈ [0, acos ((r2+b2-Ro2)/2rb)]。
Root circle section 4 equation be：T3 is variable, the span of t3 in formula
t3∈[0,π-β]。
The equation of outside circle segmental arc 2 is：In formula：T4 is variable, the span of t4
t4∈[0,π-β]。
Cycloid section 3 equation be：T5 is in formula
Variable, span t5 ∈ [0, acos (Ro/Rm)].
In the present embodiment, as pitch radius Ro=10, the radius Rm=15 of outside circle segmental arc 2, the correspondence of camber line envelope line segment 6
Central angle β=π/6 when, the radius Rn=2*Ro-Rm=20-15=5 of root circle section 4, the center of circle of arc 5 to profile
Center apart from b=(Ro2-Rn2)/(2Rocos β -2Rn) ≈ 10.245, the radius r=b-Rn=5.245 of arc 5, camber line
Envelope line segment 6 isSpan t1 ∈ [0, π/6] of t1, θ is to be with t1
The dependent variable of variable, relational expression is：Tg θ=(10.245sin 2t1-10sin t1)/(10.245cos2t1-10cost1)；
Arc 5 is：T2 is variable, the span t2 ∈ of t2 [0,
acos(0.660646915)]；Root circle section 4 is：T3 is variable, the span t3 of t3 in formula
∈[0,5π/6]；
Outside circle segmental arc 2 is：In formula：T4 is variable, the span t4 ∈ of t4 [0,5 π/
6]；
Cycloid section 3 is：T5 is variable, span t5 ∈ in formula
[0,acos(10/15)]。
Specific Experimental Comparison data are as follows：
From upper form, using its limit pressure in the case where pumping efficiency is ensured of the screw vacuum pump of this screw arbor assembly
The parameter of power, noise and matched power is superior to professional standard.
As described in Figure 5,1,2,3 in Fig. 5 are the camber line envelope on arc 5 and another screw rod 1 of screw rod 1
State when section 6 is engaged；In Fig. 5 4~9 is the outside circle segmental arc 2 on root circle section 4 and another screw rod 1 of screw rod 1
State during engagement；In Fig. 5 10,11 is that a root circle for screw rod 1 section 4 is nibbled with the outside circle segmental arc 2 on another screw rod 1
The state that a piece arc transition section 7 for screw rod 1 is engaged with the cycloid section 3 on another screw rod 1 while conjunction；In Fig. 5 12 are
The state that a piece arc transition section 7 for screw rod 1 is engaged with the cycloid section 3 on another screw rod 1；In Fig. 5 13 is a screw rod 1
Arc transition section 7 engage the cycloid section 3 and another screw rod 1 of screw rod 1 simultaneously with the cycloid section 3 on another screw rod 1
On arc transition section 7 engagement state；In Fig. 5 14,15 is the circle on cycloid section 3 and another screw rod 1 of screw rod 1
The state of the engagement of arc changeover portion 7；In Fig. 5 16~21 is the tooth on outside circle segmental arc 2 and another screw rod 1 of screw rod 1
State when root circle section 4 is engaged；In Fig. 5 22~24 be a camber line envelope line segment 6 for screw rod 1 with another screw rod 1 on
State when arc 5 is engaged.
Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute
Category those skilled in the art can make various modifications or supplement or using similar to described specific embodiment
Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.
Claims (10)
1. a kind of identical, the oppositely oriented screw rod (1) of screw arbor assembly of screw vacuum pump, including two profiles, the spiral shell
The profile of bar (1) is by the one section of outside circle segmental arc (2), one section of cycloid section (3), one section of root circle section (4), one that are sequentially connected
Section arc (5) and one section of camber line envelope line segment (6) composition, it is characterised in that the outside circle segmental arc (2) and cycloid section (3)
Between seamlessly transitted by arc transition section (7), the arc (5) is the circular arc line of indent, the arc (5) and tooth root
Circle section (4) is seamlessly transitted, and the camber line envelope line segment (6) is the camber line of evagination, the arc (5) and camber line envelope line segment
(6) seamlessly transit, the camber line envelope line segment (6) seamlessly transits with outside circle segmental arc (2), wherein the arc on a screw rod (1)
Line segment (5) is conjugated with camber line envelope line segment (6) on another screw rod (1).
2. the screw arbor assembly of screw vacuum pump according to claim 1, it is characterised in that the camber line envelope line segment (6)
Curvature from one end for being connected with outside circle segmental arc (2) to other end increase.
3. the screw arbor assembly of screw vacuum pump according to claim 1 and 2, it is characterised in that the camber line envelope line segment
(6) equation is：R is the radius of arc (5) in formula, and b is arc (5)
The center of circle to profile center distance；Ro is pitch circle, and the size of Ro is Ro=(Rn+Rm)/2, and wherein Rm is addendum circle arc
The radius of section (2), Rn is the radius of root circle section (4)；T1 is variable, and span t1 ∈ [0, β] of t1, β are camber line envelope
The corresponding central angle of line segment (6), the span of β is β ∈ [π/8, π/4]；θ is the dependent variable with t1 as variable, and relational expression is:
Tg θ=(b sin 2t1-Ro sin t1)/(b cos 2t1-Ro cos t1).
4. the screw arbor assembly of screw vacuum pump according to claim 3, it is characterised in that the center of circle of arc (5) to end
The equation apart from b at face molded line center is：B=(Ro2-Rn2)/(2Rocosβ-2Rn)。
5. the screw arbor assembly of screw vacuum pump according to claim 3, it is characterised in that the side of the radius r of arc (5)
Formula is：R=b-Rn.
6. the screw arbor assembly of screw vacuum pump according to claim 3, it is characterised in that the equation of the arc (5)
Formula is：
T2 is variable, the value of t2 in formula
Scope t2 ∈ [0, acos ((r2+b2-Ro2)/2rb)]。
7. the screw arbor assembly of screw vacuum pump according to claim 3, it is characterised in that the side of root circle section (4)
Formula is：T3 is variable, the span t3 ∈ [0, π-β] of t3 in formula.
8. the screw arbor assembly of screw vacuum pump according to claim 3, it is characterised in that the outside circle segmental arc (2)
Equation is：In formula：T4 is variable, the span t4 ∈ [0, π-β] of t4.
9. the screw arbor assembly of screw vacuum pump according to claim 3, it is characterised in that the equation of cycloid section (3)
Formula is：
In formula t5 be variable, span t5 ∈ [0,
acos(Ro/Rm)]。
10. the screw arbor assembly of screw vacuum pump according to claim 1 and 2, it is characterised in that the arc transition section
(7) radius is 0~0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621313113.8U CN206246362U (en) | 2016-12-01 | 2016-12-01 | A kind of screw arbor assembly of screw vacuum pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621313113.8U CN206246362U (en) | 2016-12-01 | 2016-12-01 | A kind of screw arbor assembly of screw vacuum pump |
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| Publication Number | Publication Date |
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| CN206246362U true CN206246362U (en) | 2017-06-13 |
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ID=59004546
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| CN201621313113.8U Active CN206246362U (en) | 2016-12-01 | 2016-12-01 | A kind of screw arbor assembly of screw vacuum pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401957A (en) * | 2016-12-01 | 2017-02-15 | 浙江创为真空设备有限公司 | Screw assembly of screw vacuum pump |
-
2016
- 2016-12-01 CN CN201621313113.8U patent/CN206246362U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401957A (en) * | 2016-12-01 | 2017-02-15 | 浙江创为真空设备有限公司 | Screw assembly of screw vacuum pump |
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| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 6 Taizhou 317015 Zhejiang 317000 Toumen port Second Avenue Binhai New District Management Committee Patentee after: Zhejiang created as a vacuum equipment Limited by Share Ltd Address before: No. 6 Taizhou 317015 Zhejiang 317000 Toumen port Second Avenue Binhai New District Management Committee Patentee before: ZHEJIANG CHUANGWEI VACUUM EQUIPMENT CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |