CN215566616U

CN215566616U - Variable-pitch screw rotor and vacuum pump

Info

Publication number: CN215566616U
Application number: CN202121253244.2U
Authority: CN
Inventors: 久军; 刘冲
Original assignee: Tianjin Ruisheng Xingye Technology Co ltd
Current assignee: Tianjin Ruisheng Xingye Technology Co ltd
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2022-01-18
Anticipated expiration: 2031-06-04

Abstract

The application provides a variable pitch screw rotor and vacuum pump belongs to vacuum pump technical field. The variable-pitch screw rotor comprises a rotor assembly and a sealing assembly, the rotor assembly comprises a rotating shaft and a spiral tooth group, the spiral tooth group comprises a first spiral tooth and a second spiral tooth, the sealing assembly comprises a fixing plate, a bearing and a sealing ring, the spiral tooth profiles in each spiral tooth group are the same through setting a plurality of groups of spiral tooth groups, the screw pitches are the same, the screw pitches between different spiral teeth are different, so that gas can be compressed in the gas conveying process, meanwhile, between the spiral teeth with the same screw pitches, a buffer time can be given to the compressed gas, the damage to equipment caused by rapid temperature rise due to the fact that the compressed gas is subjected to overspeed is avoided, meanwhile, the bearing is arranged in the fixing plate, the rotating shaft is in interference fit with the bearing, the rotating shaft is guaranteed to rotate stably, meanwhile, the sealing ring is effectively guaranteed to be sealed when the sealing ring is used in a pump, the fixing plate is designed, and convenience is brought to processing, And (5) assembling and maintaining.

Description

Variable-pitch screw rotor and vacuum pump

Technical Field

The application relates to the technical field of vacuum pumps, in particular to a variable-pitch screw rotor and a vacuum pump.

Background

At present screw vacuum pump's screw rotor mainly divide into uniform pitch screw rotor and variable pitch screw rotor, wherein uniform pitch screw rotor bleeds inefficiency, the consumption is big, and can produce higher heat at the exhaust end, however traditional continuous variable pitch screw rotor, but this kind of rotor processing is complicated, continuous compressed air leads to the temperature to rise fast easily in the course of the work, easily lead to screw rotor thermal expansion deformation and the card is dead, and traditional screw rotor's dynamic seal structure is comparatively simple, sealed effect is poor, excellent in use effect.

SUMMERY OF THE UTILITY MODEL

In order to remedy the above deficiencies, the present application provides a variable pitch screw rotor and a vacuum pump, which aim to ameliorate the problems mentioned in the background above.

In a first aspect, embodiments of the present application provide a variable pitch screw rotor including a rotor assembly and a seal assembly.

The rotor subassembly is provided with two sets ofly, the rotor subassembly includes pivot and spiral tooth group, spiral tooth group is provided with two sets ofly at least, spiral tooth group is including first spiral tooth and second spiral tooth, first spiral tooth is provided with a plurality ofly, and is a plurality of fixed cover of first spiral tooth is located the pivot surface, and is a plurality of first spiral tooth profile line is the same, and the pitch is the same, the second spiral tooth is provided with a plurality ofly, and is a plurality of the fixed cover of second spiral tooth is located the pivot surface, and is a plurality of the second spiral tooth profile line is the same, and the pitch is the same, and is a plurality of the interval of first spiral tooth is greater than a plurality of the interval of second spiral tooth.

The sealing assembly is provided with two sets, the sealing assembly comprises a fixing plate, a bearing and a sealing ring, a through hole is formed in the fixing plate, the bearing is arranged in the through hole, the sealing ring is arranged in the through hole, the rotating shaft is in interference fit with the bearing, and the sealing ring is located between the bearing and the spiral tooth group.

In the above-mentioned realization in-process, through setting up multiunit helical tooth group, the helical tooth molded lines in every helical tooth group are the same, the pitch is the same, pitch between the different helical tooth is different, thereby can be at conveying gas in-process compressed gas, simultaneously between the helical tooth that the pitch is the same, can give a buffer time of compressed gas, thereby avoid the compressed gas of overspeed to lead to the temperature to rise fast and damage equipment, set up the bearing in the fixed plate through the setting simultaneously, pivot and bearing interference fit, guarantee the steady rotation of pivot, its leakproofness when using in the pump is guaranteed effectively in the setting of sealing washer simultaneously, adopt the design of fixed plate, and is convenient for process, assembly and maintenance.

In a specific embodiment, the through hole is provided with a groove in communication, and the bearing is arranged in the groove.

In the implementation process, the groove is used for installing the bearing.

In a specific implementation scheme, the groove is communicated with a clamping groove, a clamping block is arranged on the outer side of the bearing, and the clamping block is inserted into the clamping groove.

In the implementation process, the rotation of the bearing outer ring is limited.

In a specific embodiment, the through hole is communicated with a ring groove, the ring groove is a T-shaped groove, the sealing ring is a T-shaped ring, and the sealing ring is clamped in the ring groove.

In the implementation process, the T-shaped sealing ring is firmer, and meanwhile, the sealing performance is also improved.

In a specific embodiment, a plurality of balance grooves are formed on the top surface of the first spiral tooth crest, and the balance grooves are uniformly arranged.

In the implementation process, the rotor can rotate more stably by arranging the balance groove.

In a specific implementation scheme, the rotor assembly further comprises two transmission gears, the two transmission gears are respectively arranged at one end of the two rotating shafts, and the two transmission gears are meshed and connected with each other.

In the implementation process, one rotating shaft is driven to rotate by an external motor, and the other rotating shaft is driven to rotate by the rotating shaft through a transmission gear, so that the synchronization rate is ensured.

In a second aspect, an embodiment of the present invention further provides a vacuum pump, which includes the variable pitch screw rotor and a pump body assembly, where the pump body assembly includes a casing and a slot plate, the slot plate is disposed in the casing, the slot plate is provided with an insertion slot, and the fixing plate is embedded in the insertion slot.

In a specific embodiment, the slot plate is provided with a rotating slot, and the rotating shaft is in clearance fit with the inner wall of the rotating slot.

In the implementation process, the rotating groove is arranged for the rotating shaft to rotate and penetrate through.

In a specific embodiment, the shell is provided with a water cavity, and the water cavity is communicated with two connectors.

In the implementation process, the water cavity and the two connectors are arranged and connected with an external water source to supply water to the water cavity for circulation, so that the temperature during working is effectively reduced.

In a specific embodiment, the pump body assembly further comprises a protective cover disposed at one end of the housing.

In the implementation process, the gear is used for protecting and covering one end of the rotating shaft.

Drawings

In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic structural view of a variable pitch screw rotor provided in an embodiment of the present application;

FIG. 2 is a schematic structural view of a rotor assembly provided in an embodiment of the present application;

fig. 3 is an enlarged schematic structural diagram of a according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a card slot provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of a pump body assembly according to an embodiment of the present application.

In the figure: 100-a rotor assembly; 110-a rotating shaft; 120-helical tooth set; 121-a first helical tooth; 1211 — a balancing tank; 122-a second helical tooth; 130-a drive gear; 200-a seal assembly; 210-a fixed plate; 211-a through hole; 2111-ring groove; 212-a groove; 2121-card slot; 220-a bearing; 221-fixture block; 230-a sealing ring; 300-a pump body assembly; 310-a housing; 311-a water chamber; 3111-a connector; 320-a groove plate; 321-caulking groove; 322-rotary groove; 330-protective cover.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1-5, the present application provides a variable pitch screw rotor including a rotor assembly 100 and a seal assembly 200.

Referring to fig. 2, the rotor assembly 100 includes two sets, the rotor assembly 100 includes a rotating shaft 110 and a spiral tooth set 120, the spiral tooth set 120 includes at least two sets, the spiral tooth set 120 includes a first spiral tooth 121 and a second spiral tooth 122, the first spiral tooth 121 is provided with a plurality of first spiral teeth 121 fixedly secured to the surface of the rotating shaft 110, the first spiral tooth 121 is integrally formed on the rotating shaft 110, the first spiral teeth 121 have the same profile and the same pitch, in this embodiment, the top surface of the first spiral tooth 121 is provided with a plurality of balance grooves 1211, the plurality of balance grooves 1211 are uniformly arranged, the rotor rotation is more stable by providing the balance grooves 1211, the second spiral teeth 122 are provided with a plurality of second spiral teeth 122 fixedly secured to the surface of the rotating shaft 110, the second spiral teeth 122 are integrally formed on the rotating shaft 110, the second spiral teeth 122 have the same profile and the same pitch, the pitch of the first spiral teeth 121 is greater than the pitch of the second spiral teeth 122, in the actual use process, the spiral tooth spacing from the air inlet end to the air outlet end is gradually reduced.

It should be noted that, the rotor assembly 100 further includes two transmission gears 130, the two transmission gears 130 are disposed at one end of the two rotating shafts 110, the two transmission gears 130 are meshed with each other, one rotating shaft 110 is driven to rotate by an external motor, and the rotating shaft 110 drives the other rotating shaft 110 to rotate by the transmission gears 130, so as to ensure a synchronization rate.

Referring to fig. 3 and 4, two sets of seal assemblies 200 are provided, each seal assembly 200 includes a fixing plate 210, a bearing 220 and a seal ring 230, the fixing plate 210 is provided with a through hole 211, the bearing 220 is disposed in the through hole 211, specifically, the through hole 211 is communicated with a groove 212, the bearing 220 is disposed in the groove 212, the groove 212 is provided for mounting the bearing 220, specifically, the groove 212 is communicated with a slot 2121, the outer side of the bearing 220 is provided with a latch 221, the bearing 220 is integrally formed with the latch 221, the latch 221 is inserted into the slot 2121, which is beneficial to limiting rotation of an outer ring of the bearing 220, the seal ring 230 is disposed in the through hole 211, the rotating shaft 110 and the bearing 220 are in interference fit, the seal ring 230 is disposed between the bearing 220 and the helical tooth group 120, specifically, the through hole 211 is communicated with a 211ring groove 1, the ring groove 2111 is a T-shaped groove, the seal ring 230 is a T-shaped ring, the seal ring 230 is disposed in the ring groove 2111, and the T-shaped seal ring 230 is more firmly, meanwhile, the sealing performance is also improved.

Referring to fig. 4 and 5, another vacuum pump according to an embodiment of the present invention includes the variable pitch screw rotor and pump body assembly 300, the pump body assembly 300 includes a housing 310 and a groove plate 320, the groove plate 320 is disposed in the housing 310, the groove plate 320 and the housing 310 are integrally designed, the groove plate 320 is provided with an insertion groove 321, the fixing plate 210 is inserted into the insertion groove 321, specifically, the groove plate 320 is provided with a rotation groove 322, the inner wall of the rotation groove 322 is in clearance fit with the rotation shaft 110, and by disposing the rotation groove 322, for the rotation of the shaft 110, in this embodiment, the housing 310 is provided with a water cavity 311, the water cavity 311 is disposed in the connector 3111, through setting up water cavity 311 and two connectors 3111, connect the internal circulation of external water source feed water cavity 311 and lead to water, reduce the temperature of during operation effectively, pump body subassembly 300 still includes protective cover 330, and protective cover 330 sets up in casing 310 one end for protective cover 330 lives the gear of pivot 110 one end.

The working principle of the variable-pitch screw rotor and the vacuum pump is as follows: drive a pivot 110 through the motor and rotate, pivot 110 drives another pivot 110 through drive gear 130 and rotates, thereby drive first helical tooth 121 and second helical tooth 122 and rotate, make gas compressed through the pitch of gradual change, thereby improve the efficiency of bleeding, simultaneously between the helical tooth that the pitch is the same, can give a buffer time of compressed gas, thereby avoid the compressed gas of overspeed to lead to the temperature to rise fast and damage equipment, set up bearing 220 in fixed plate 210 through setting up simultaneously, pivot 110 and bearing 220 interference fit, guarantee pivot 110 and steadily rotate, its leakproofness when casing 310 is used is guaranteed effectively in the setting of sealing washer 230 simultaneously, adopt the design of fixed plate 210, and is convenient for processing, assembly and maintenance.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A variable pitch screw rotor comprising

A rotor assembly (100), the rotor assembly (100) being provided with two sets, the rotor assembly (100) comprising a rotating shaft (110) and a helical tooth set (120), the spiral tooth group (120) is at least provided with two groups, the spiral tooth group (120) comprises a first spiral tooth (121) and a second spiral tooth (122), the number of the first spiral teeth (121) is multiple, the first spiral teeth (121) are fixedly sleeved on the surface of the rotating shaft (110), the profiles of the first spiral teeth (121) are the same, the thread pitches are the same, the second spiral teeth (122) are provided in plurality, the second spiral teeth (122) are fixedly sleeved on the surface of the rotating shaft (110), the profiles of the second spiral teeth (122) are the same, the thread pitches are the same, and the intervals of the first spiral teeth (121) are larger than the intervals of the second spiral teeth (122);

seal assembly (200), seal assembly (200) is provided with two sets ofly, seal assembly (200) is including fixed plate (210), bearing (220) and sealing washer (230), through-hole (211) have been seted up to fixed plate (210), bearing (220) set up in through-hole (211), sealing washer (230) set up in through-hole (211), pivot (110) with bearing (220) interference fit, sealing washer (230) are located bearing (220) with between the helical tooth group (120).

2. The variable pitch screw rotor of claim 1, wherein the through hole (211) is open with a groove (212), and the bearing (220) is disposed in the groove (212).

3. The variable pitch screw rotor according to claim 2, wherein a slot (2121) is formed in the groove (212) in a communicating manner, a clamping block (221) is arranged outside the bearing (220), and the clamping block (221) is clamped in the slot (2121).

4. The variable pitch screw rotor according to claim 1, wherein the through hole (211) is communicated with an annular groove (2111), the annular groove (2111) is a T-shaped groove, the sealing ring (230) is a T-shaped ring, and the sealing ring (230) is clamped in the annular groove (2111).

5. The variable pitch screw rotor of claim 1, wherein the first helical tooth (121) has a plurality of balance grooves (1211) formed on a top surface thereof, and the plurality of balance grooves (1211) are uniformly arranged.

6. The variable pitch screw rotor according to claim 1, wherein the rotor assembly (100) further comprises two transmission gears (130), two transmission gears (130) are arranged, the two transmission gears (130) are respectively arranged at one end of the two rotating shafts (110), and the two transmission gears (130) are meshed and connected.

7. A vacuum pump, characterized in that it comprises

The variable pitch screw rotor of any one of claims 1 to 6, and

the pump body assembly (300) comprises a shell (310) and a groove plate (320), wherein the groove plate (320) is arranged in the shell (310), an embedded groove (321) is formed in the groove plate (320), and the fixing plate (210) is embedded in the embedded groove (321).

8. A vacuum pump according to claim 7, characterized in that the slot plate (320) is provided with a rotary slot (322), and the rotary shaft (110) is in clearance fit with the inner wall of the rotary slot (322).

9. Vacuum pump according to claim 7, characterized in that the housing (310) is opened with a water cavity (311), and the water cavity (311) is connected with two connectors (3111).

10. The vacuum pump of claim 7, wherein the pump body assembly (300) further comprises a protective cover (330), the protective cover (330) being disposed at one end of the housing (310).