Roots vacuum pump rotor and roots vacuum pump

Abstract

The utility model provides a Roots vacuum pump rotor and a Roots vacuum pump, and belongs to the technical field of vacuum pumps. The Roots vacuum pump rotor comprises a rotating shaft and at least one stage of rotor component arranged in the axial direction of the rotating shaft. The rotating shaft is provided with an air inlet channel in the axial direction. Any stage of rotor component is provided with at least one group of jet channels along the axial direction, the jet inlets of the jet channels are communicated with the air inlet channels, and the jet outlets of the jet channels are positioned at the blade tops of the rotor components; an external air source flows into the jet flow channel along the air inlet channel and is sprayed out through jet flow generated by the jet outlet, and the jet flow movement direction of the jet outlet is consistent with the rotation direction of a rotor of the roots vacuum pump. By arranging the jet flow channel on the rotor and assisting external air source input, loss caused by leakage between the rotor and the inner wall face of the pump shell is reduced, the backflow impact influence at a pump outlet is effectively reduced, the flow state in the vacuum pump shell is improved, heat generated in the operation process of the vacuum pump can be taken away, and the refrigeration effect is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of vacuum pumps, and in particular relates to a Roots vacuum pump rotor and a Roots vacuum pump. Background Art

[0002] Roots vacuum pumps have the advantages of simple structure, flexible installation, no need for internal lubrication, and high volumetric efficiency. They have been widely used in many key areas of the national economy, such as petrochemicals, semiconductor manufacturing, energy development, light industry and food.

[0003] In the internal operation of the Roots vacuum pump, the gaps between the rotors, between the rotors and the pump housing, and between the rotors and the front and rear cover plates are important components of the vacuum pump. During the operation of the pump, as the Roots rotors rotate continuously, the pressure in the outlet area gradually increases, forming a high-pressure area. This pressure accumulation causes part of the leaked gas to flow back to the low-pressure area through the above-mentioned gaps. Since these leaked gases are at high temperatures, they will heat the subsequent inflowing gas, causing the volume of the inlet gas to increase, thereby reducing the volumetric efficiency of the pump and further reducing the mass flow rate of the pump. In addition, during the rotation of the rotor, as the outlet pressure continues to accumulate, a large reflux shock and air flow pulsation will be generated at the outlet, affecting the operating stability of the pump and limiting its application scope and development potential. The leakage flow and the outlet reflux shock caused by it have a great influence on the operating efficiency of the vacuum pump.

[0004] Therefore, improving the sealing performance of the vacuum pump and reducing the outlet backflow impact are crucial to the advancement of Roots vacuum pumps. Utility Model Content

[0005] The present disclosure aims to solve at least one of the technical problems existing in the prior art, and provides a Roots vacuum pump rotor and a Roots vacuum pump.

[0006] In one aspect of the present disclosure, a Roots vacuum pump rotor is provided, the Roots vacuum pump rotor comprising a rotating shaft and at least one rotor component arranged axially along the rotating shaft; wherein:

[0007] The rotating shaft is provided with an air inlet passage along its axial direction;

[0008] The rotor component of any stage is provided with at least one group of jet channels along its axial direction, the jet inlet of the jet channel is connected with the air inlet channel, and the jet outlet of the jet channel is located at the blade top of the rotor component;

[0009] An external gas source flows into the jet channel along the air inlet channel, and a jet is ejected through the jet outlet. The jet movement direction of the jet outlet is consistent with the rotation direction of the Roots vacuum pump rotor.

[0010] Optionally, the jet channel bends and extends from the jet inlet to the jet outlet, and the bending and extending direction is the same as the rotation direction of the Roots vacuum pump rotor.

[0011] Optionally, the air inlet passage comprises an axial passage arranged axially along the rotating shaft, and at least one group of connecting passages distributed axially along the axial passage; wherein,

[0012] The injection inlet of each group of the jet channels is connected to the axial channel through each group of the connecting channels.

[0013] Optionally, the rotor component at any stage is provided with a plurality of groups of jet channels at intervals along its axial direction, and the rotating shaft is provided with a plurality of groups of connecting channels at intervals along its axial direction;

[0014] The multiple groups of jet channels correspond one to one to the multiple groups of connecting channels.

[0015] Optionally, any group of the connecting channels comprises a plurality of connecting sub-channels, and the plurality of connecting sub-channels are distributed at intervals along the circumference of the rotating shaft;

[0016] A plurality of blades of the rotor component at any stage are provided with jet sub-channels, and the plurality of jet sub-channels correspond one-to-one to the plurality of connecting sub-channels to form a plurality of arc-shaped channels.

[0017] Optionally, the arc radius of the arc channel is 20 to 120 mm; and / or,

[0018] The inner diameter of the arc-shaped channel is 0.05 to 2 mm; and / or,

[0019] The length of the axial channel is 10% to 80% of the length of the rotating shaft.

[0020] Optionally, the distance between the air inlet of the air inlet channel and the first group of jet channels in the first-stage rotor component is 40% to 60% of the length of the rotating shaft; and / or,

[0021] The distance between the injection outlet and the rotation axis is 4 to 20 mm.

[0022] Optionally, a primary rotor component is arranged axially on the rotating shaft; wherein,

[0023] In this stage, the rotor component is provided with a plurality of groups of jet channels at equal intervals along its axial direction.

[0024] Optionally, multiple stages of rotor components are arranged axially at intervals on the rotating shaft; wherein,

[0025] At each stage, the rotor component is provided with at least one group of jet channels along its axial direction.

[0026] In one aspect of the present disclosure, a Roots vacuum pump is provided, comprising: a pump housing and a left rotor and a right rotor arranged in the pump housing; wherein:

[0027] The left rotor and the right rotor adopt the Roots vacuum pump rotors described above.

[0028] The present disclosure proposes a Roots vacuum pump rotor and a Roots vacuum pump, wherein the Roots vacuum pump rotor comprises a rotating shaft and at least one rotor component arranged axially along the rotating shaft; wherein the rotating shaft is provided with an air intake channel along its axial direction; at least one set of jet channels is provided along its axial direction at any one of the rotor components, the jet inlet of the jet channel is connected with the air intake channel, and the jet outlet of the jet channel is located at the blade top of the rotor component; an external gas source flows into the jet channel along the air intake channel, and a jet is ejected through the jet outlet, and the jet movement direction of the jet outlet is consistent with the rotation direction of the Roots vacuum pump rotor. The present disclosure introduces an external gas source through the air intake channel, and the introduced external gas source is ejected at the blade top position through the jet channel structure arranged on the rotor to form a jet, which can reduce the loss caused by leakage between the rotor and the inner wall of the pump housing, and can also effectively block the reverse flow path from the high pressure area to the low pressure area, effectively reduce the impact of the backflow at the pump outlet, improve the flow state in the vacuum pump, and can take away the heat generated during the operation of the vacuum pump to achieve a cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the internal opening structure of a Roots vacuum pump rotor with an opening jet according to an embodiment of the present disclosure;

[0030] Figure 2 A schematic diagram of the internal opening structure of a Roots vacuum pump rotor with an opening jet according to another embodiment of the present disclosure;

[0031] Figure 3 A front view of a Roots vacuum pump rotor with an open-hole jet according to another embodiment of the present disclosure;

[0032] Figure 4 A top view of a Roots vacuum pump rotor with an open-hole jet according to another embodiment of the present disclosure;

[0033] Figure 5 For this disclosure Figure 4 Sectional view of the AA plane;

[0034] Figure 6 For this disclosure Figure 5 A local enlarged view along the axis direction;

[0035] Figure 7 For this disclosure Figure 4 Middle BB plane section view;

[0036] Figure 8 For this disclosure Figure 4 Middle CC section view;

[0037] Fig. 9 FIG. 4 is a schematic diagram of a Roots vacuum pump according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the disclosure. The described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present disclosure.

[0039] In some descriptions of the present disclosure, the terms "include" or "comprises" and the like neither limit the mentioned shapes, numbers, steps, operations, components and / or groups thereof, nor exclude the presence or addition of one or more other different shapes, numbers, steps, operations, components and / or groups thereof.

[0040] In some descriptions of the present disclosure, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number and order of the indicated technical features.

[0041] In some descriptions of the present disclosure, terms such as “connected”, “connected” or “fixed” and the like are not limited to direct connections but may also refer to indirect connections via intermediate media.

[0042] like Figures 1 to 8 As shown, one aspect of the present disclosure proposes a Roots vacuum pump rotor, comprising a rotating shaft and at least one rotor component arranged axially along the rotating shaft; wherein, the rotating shaft is provided with an air inlet channel along its axial direction, and the air inlet of the air inlet channel is located at one end close to the front cover plate of the Roots vacuum pump, that is, the air inlet of the air inlet channel is located on the side away from the flow direction of the air flow, and the external gas flows along the air inlet channel toward the rotor through the air inlet. Secondly, at least one group of jet channels is provided along the axial direction of any rotor component, the jet inlet of the jet channel is connected to the air inlet channel, and the jet outlet of the jet channel is located at the blade top of the rotor component; the external gas source flows into the jet channel along the air inlet channel, and a jet is ejected through the jet outlet; the jet movement direction of the jet outlet is consistent with the rotation direction of the Roots vacuum pump rotor.

[0043] In this embodiment, on the one hand, an external gas source can be introduced by opening an air inlet channel in the axial direction of the rotating shaft, and the high-energy jet provided by the external gas source is used to ensure that the rotor has sufficient energy during the rotation process, forming an effective airflow blockage. On the other hand, by setting a jet channel connected to the air inlet channel on the rotor component, the external gas is ejected from the jet outlet. When the rotor rotates to a position close to the exhaust port, the strong jet mixes with the main airflow in the pump housing, increasing the gas molecule density in the area, increasing the pressure in the area, and helping the internal pressure of the pump housing to reach equilibrium with the external pressure faster, suppressing the backflow impact and pressure fluctuation at the pump housing outlet; on the other hand, the jet movement direction based on the jet outlet is consistent with the rotor rotation direction, and the jet direction is opposite to the leakage flow direction caused by the pressure difference at the gap, which can reduce the leakage loss at the blade tip gap.

[0044] Furthermore, in order to make the direction of the jet consistent with the direction of rotation of the rotor, in some preferred embodiments, the jet channel can be bent and extended from the jet inlet to the jet outlet, and the bending extension direction is the same as the rotation direction of the rotor, so as to ensure that the jet ejection direction of the jet outlet is the same as the rotation direction of the rotor. In this way, after the external air source flows into the interior of the rotor, the external air source first flows to the jet channel through the air inlet channel, and then the external air source flows in the jet channel along the bending extension direction of the jet channel, and further flows to the jet outlet as the rotor rotates, forming a jet at the jet outlet, and the movement direction of the jet is the same as the rotation direction of the rotor, so that the ejected jet fluid expands along the inner wall of the pump casing, and can take away the local heat close to the inner wall of the pump casing, thereby realizing the control of the internal temperature of the pump casing and achieving a cooling effect.

[0045] The injection outlet of the present embodiment is located at the blade tip of the rotor component, which can not only significantly reduce the leakage at the blade tip, but also help reduce the heat load of the blade tip area.

[0046] It should be noted that when the rotor rotates clockwise, the jet channel provided on the rotor bends and extends in the clockwise direction, and when the rotor rotates counterclockwise, the jet channel provided on the rotor bends and extends in the counterclockwise direction.

[0047] It should be further explained that the present embodiment does not specifically limit the shape and structure of the jet channel. For example, the channel is arc-shaped along its length and has a circular cross-section, that is, the jet channel is a curved and extended circular hole channel.

[0048] It should be noted that the present embodiment does not specifically limit the number of stages of the rotor components provided on the rotating shaft, and it may be a single-stage rotor component or a multi-stage rotor component.

[0049] It should be understood that when there is only one stage of the rotor component, one or more groups of jet channels may be provided in the rotor component along the axial direction of the rotating shaft, and the multiple groups of jet channels may be distributed at equal intervals or at unequal intervals. When there are multiple stages of the rotor component, one or more groups of jet channels may be provided in each stage of the rotor component along the axial direction of the rotating shaft, and similarly, the multiple groups of jet channels on any stage of the rotor component may be distributed at equal intervals or at unequal intervals, so that one or more groups of injection outlets are provided on the blade top of the rotor component.

[0050] It should also be understood that when multiple stages of rotor components are arranged on the rotating shaft and the length of the multiple stages of rotor components along the axial direction thereof decreases step by step, the number of jet channels arranged on each stage of the rotor components may be different. In addition, when the intervals between the multiple stages of rotor components also decrease gradually, the intervals between the jet channels arranged on adjacent rotor components may be different.

[0051] It should be noted that the present embodiment does not specifically limit the shape of the rotor component. For example, when the rotor is a two-lobed rotor, its rotor component has an 8-shaped outline; for example, when the rotor is a three-lobed rotor, its rotor component has a Y-shaped outline; for example, when the rotor is a five-lobed rotor, its rotor component has a flower-shaped outline. Of course, the rotor component can also have other shapes.

[0052] It should be understood that when the rotor component has two blades, three blades, five blades or another number of blades, a jet channel may be provided on each blade.

[0053] Furthermore, the present embodiment does not impose any specific limitation on the length of the air intake passage, wherein the length of the air intake passage may be determined according to the number of jet passages on the rotor component.

[0054] It should still be noted that the present embodiment does not impose any specific limitation on the structure of the air inlet channel, as long as it is possible to introduce external gas and connect it with the jet channel on the rotor component. That is to say, in addition to the axial openings on the rotating shaft, holes should also be opened on its side walls to achieve connection with the jet channel.

[0055] Exemplarily, the air inlet channel includes an axial channel arranged along the axial direction of the rotating shaft, and at least one group of connecting channels distributed along the axial direction of the axial channel; wherein the injection inlet of each group of jet channels is connected to the axial channel through each group of connecting channels. In other words, a connecting channel corresponding to the jet channel is arranged on the axial channel, so that the external air source flows into the jet channel through the axial channel.

[0056] In some preferred embodiments, when multiple groups of jet channels are arranged at intervals along the axial direction on a single-stage rotor component or a multi-stage rotor component, correspondingly, multiple groups of connecting channels are arranged at intervals along the axial direction of the rotating shaft; the multiple groups of jet channels correspond one-to-one to the multiple groups of connecting channels.

[0057] In other preferred embodiments, any group of connecting channels includes a plurality of connecting sub-channels, and the plurality of connecting sub-channels are distributed at intervals along the circumference of the rotating shaft; correspondingly, jet sub-channels are provided on the plurality of blades of any level of the rotor component, and the plurality of jet sub-channels correspond one-to-one with the plurality of connecting sub-channels to form a plurality of arc-shaped channels. In other words, each group of jet channels is composed of a plurality of jet sub-channels, and each group of connecting channels is composed of a plurality of connecting sub-channels, and each jet sub-channel forms an arc-shaped channel with each connecting sub-channel, the starting end of the arc-shaped channel is the axial center of the rotating shaft, the terminal end of the arc-shaped channel is the blade top (injection outlet), and the starting end and the terminal end of the arc-shaped channel are located on the same straight line. In other words, the arc endpoints of the arc-shaped channel are determined by the axial center point of the rotating shaft and the circumferential outermost point of the rotor component.

[0058] As a further preferred solution, the arc radius of the arc-shaped channel is 20 to 120 mm, for example, 20 mm, 45 mm, 65 mm, 80 mm, 100 mm, 120 mm, etc., and can be set according to the size of the rotor component and the rotating shaft.

[0059] As a further preferred solution, the inner diameter of the arcuate channel is 0.05-2 mm, for example, 0.05 mm, 0.5 mm, 1 mm, 1.2 mm, 1.6 mm, 2 mm, etc. In other words, the inner diameters of the jet sub-channel and the connecting sub-channel are both between 0.05 and 2 mm.

[0060] As a further preferred solution, the length of the axial channel is 10% to 80% of the length of the rotating shaft, for example, 20%, 30%, 40%, 50%, 70%, 80%, and the specific length can be determined according to the number of jet channels provided on the rotor component. In other words, the front end of the rotating shaft is open and the rear end is closed to form an axial channel, and the air inlet of the axial channel is located at the front end of the rotating shaft, so that the flow direction of the external gas in the air inlet channel is the same as the flow direction of the main air flow.

[0061] As a further preferred solution, the distance between the air inlet of the air inlet channel and the first group of jet channels in the rotor component is 40% to 60% of the length of the rotating shaft, for example, 40%, 50%, or 60%.

[0062] As a further preferred embodiment, the distance between the injection outlet and the axial center of the rotating shaft is 4 to 20 mm, for example, 4 mm, 10 mm, 15 mm, or 20 mm.

[0063] like Fig. 9As shown, another aspect of the present disclosure provides a Roots vacuum pump, comprising: a pump housing 310 and a left rotor 100 and a right rotor 200 disposed in the pump housing 310; wherein the left rotor 100 and the right rotor 200 are both the Roots vacuum pump rotors described above, and have medium flow capabilities. For the specific structure, please refer to the above description, which will not be repeated here.

[0064] Furthermore, if Fig. 9 As shown, the left rotor 100 and the right rotor 200 rotate in opposite directions around their respective rotation axes; the axes of the left rotation axis 110 and the right rotation axis 210 are arranged parallel to each other.

[0065] It should be noted that the present embodiment does not impose any specific limitation on the material of the left rotor and the right rotor, as long as they have high strength and wear resistance and corrosion resistance. For example, the material of the left rotor and the right rotor is a high-nickel alloy material.

[0066] Furthermore, if Fig. 9 As shown, a pump inlet 320 and a pump outlet are provided on the pump housing 310 , wherein the pump inlet 320 is an inlet for the main airflow, and the pump outlet is an outlet for the main airflow.

[0067] It should be understood that the external gas entering the rotor referred to in the previous text is different from the main airflow entering the pump casing. In this way, the high-energy jet provided by the external air source can be used to ensure that the rotor has sufficient energy during the rotation process, form an effective airflow blockage, and increase the gas molecule density.

[0068] It should be noted that the Roots vacuum pump should also include a front cover plate and a rear cover plate, which are respectively located at both ends of the pump housing to form a closed cavity with the pump housing, wherein the front cover plate is located at one end of the pump housing close to the pump inlet (such as Fig. 9 The rear cover is located at the end of the pump housing close to the pump outlet (such as Fig. 9 on the left side of the pump housing).

[0069] Furthermore, based on the Roots vacuum pump structure given above, its working method includes the following steps S1 to S3:

[0070] S1, the left rotor and the right rotor rotate in opposite directions driven by their respective rotating shafts, the external gas is connected to the air inlet channel of the rotating shaft, and the gas flows in from the air inlet of the air inlet channel.

[0071] S2, the gas flows along the intake channels of the left rotor and the right rotor to at least one set of jet channels, and a jet is generated at the jet outlet;

[0072] S3. The jet is discharged from the jet outlet and interacts with the main airflow in the pump.

[0073] Specifically, the external gas enters from the air inlets of the air inlet channels of the left rotor and the right rotor, and continues to flow along the axial channel until it reaches the position of the connecting channel connected to the axial channel. The external gas flowing along the axial channel flows into different connecting channels respectively, and then further flows into different jet channels, and finally generates jets at the injection outlets of different jet channels. These discharged jets interact with the main airflow in the pump casing, increasing the density of gas molecules in the area, resulting in an increase in the number of intermolecular collisions and collisions between molecules and the container wall, thereby generating a higher pressure in the area, further increasing the pressure near the outlet side, which helps to balance the internal pressure of the pump with the external pressure faster, and effectively suppresses the backflow shock and pressure fluctuations at the outlet.

[0074] The structure of the Roots vacuum pump and the rotor will be described below with specific embodiments:

[0075] Example 1

[0076] like Figures 1 to 9 As shown, the Roots vacuum pump includes a pump housing 310 and a left rotor 100 and a right rotor 200 disposed in the pump housing 310. The left rotor and the right rotor both include a primary rotor component, and the rotor component has two blades and an 8-shaped outer contour.

[0077] Among them, Figures 1 to 9 As shown, the left rotor 100 includes a left rotating shaft 110 and an 8-shaped left rotor component 120 axially arranged along the left rotating shaft 110. The left rotating shaft 110 is provided with a left air intake passage 130 along its axial direction, and the left air intake passage 130 includes a left axial passage 131 axially arranged along the left rotating shaft 110 and seven groups of left connecting passages 132 axially evenly distributed along the left axial passage 131. Correspondingly, seven groups of left jet passages 140 are evenly arranged along the axial direction of the left rotor component 120, and each group of left jet passages 140 corresponds to each group of left connecting passages 132 one by one, and the left injection inlet of each group of left jet passages 140 is connected to the left axial passage 131 through each group of left connecting passages 132, and seven groups of left injection outlets 141 are correspondingly arranged at the blade top of the left rotor component 120.

[0078] Furthermore, if Figures 1 to 7 As shown, based on the 8-shape of the left rotor component, it includes two left blades, so that each group of left jet channels 140 includes two left jet sub-channels 142, and the two left jet sub-channels 142 are respectively arranged on each left blade of the left rotor component 120, that is, each left blade is provided with a left jet sub-channel 142, and two left jet sub-channels are arranged on the two left blades in total, and the two left jet sub-channels form a group of left jet channels, so that when each left blade on the left rotor component contacts the inner wall of the pump casing, a jet will be ejected.

[0079] For further information, please refer to Figures 1 to 8 , two left connecting sub-channels 132a penetrating the wall thickness of the left rotating shaft 110 are provided, and each left connecting sub-channel 132a is correspondingly connected with each left jet sub-channel 142 to form a left arc-shaped channel 150. In other words, a left arc-shaped channel 150 is opened from the left axial channel 131 of the left rotating shaft 110 to the blade tip direction of the left blade, and the bending and extending direction of the left arc-shaped channel 150 is the same as the rotation direction of the left rotor. For example, when the left rotor rotates in the counterclockwise direction, the left arc-shaped channel on the left rotor component bends and extends in the counterclockwise direction.

[0080] It should be understood that since the 8-shaped rotor component is an axisymmetric structure, the left jet sub-channels arranged on its two blades should be a center-symmetrical structure, that is, the two left jet sub-channels are distributed center-symmetrically along the axial center of the left rotor. Of course, the corresponding two left connecting sub-channels should also be distributed center-symmetrically, and thus the left arc-shaped channel is also a center-symmetrical structure.

[0081] In some preferred embodiments, the arc radius of the left arc-shaped channel is 20 to 120 mm, for example, 20 mm, 45 mm, 65 mm, 80 mm, 100 mm, 120 mm, etc., and can be set according to the size of the left rotor component and the left rotating shaft.

[0082] As a further preferred embodiment, Figure 3 and Figure 8 As shown, the radius of the left arc-shaped channel 150 is 45 mm.

[0083] In other preferred embodiments, the inner diameter of the left arc-shaped channel is 0.05-2 mm, for example, 0.05 mm, 0.5 mm, 1 mm, 1.2 mm, 1.6 mm, 2 mm, etc.

[0084] As a further preferred embodiment, Figure 8 As shown, the inner diameter of the left arc-shaped channel 150 is 2 mm.

[0085] In other preferred embodiments, the length of the left axial channel is 10% to 80% of the length of the left rotating shaft, for example, 20%, 30%, 40%, 50%, 70%, 80%. The specific length can be determined according to the number of jet channels set on the left rotor component.

[0086] As a further preferred embodiment, Figure 5 As shown, the length of the left axial channel 131 is 80% of the length of the left rotating shaft 110, meeting the requirement of setting multiple groups of left jet channels.

[0087] In other preferred embodiments, the distance between the left air inlet of the left air inlet channel and the first group of left jet channels in the left rotor component is 40% to 60% of the length of the left rotating shaft, for example, 40%, 50%, or 60%.

[0088] As a further preferred embodiment, Figures 1 to 4 As shown, the distance between the left air inlet of the left air inlet passage 130 and the first group of left jet passages 140 in the left rotor component 120 is 40% of the length of the left rotating shaft 110 .

[0089] In other preferred embodiments, the distance between the left injection outlet and the center of the left rotation axis is 4 to 20 mm, for example, 4 mm, 10 mm, 15 mm, or 20 mm.

[0090] As a further preferred embodiment, Figures 1 to 3 As shown, the distance between the left injection outlet 141 and the center of the left rotation shaft 110 is 20 mm.

[0091] It should be understood that, generally speaking, the right rotor should have the same structure as the left rotor. When the left rotor has seven groups of left jet channels, the right rotor should also have seven groups of right jet channels. Of course, in other embodiments, other numbers of left jet channels can be set on the left rotor, and other numbers of right jet channels can also be set on the right rotor. The number of groups of left jet channels and right jet channels can be equal or unequal, and there is no specific limitation on this.

[0092] Specifically, Figures 1 to 8 As shown, the right rotor 200 includes a right rotating shaft 210 and an 8-shaped right rotor component 220 arranged axially along the right rotating shaft 210, wherein the right rotating shaft 210 is provided with a right air intake passage 230 along its axial direction, and the right air intake passage 230 includes a right axial passage 231 arranged axially along the right rotating shaft 210 and seven groups of right connecting passages 232 equidistantly distributed axially along the right axial passage 231. Correspondingly, seven groups of right jet passages 240 are evenly spaced along the axial direction of the right rotor component 220, each group of right jet passages 240 corresponds to each group of right connecting passages 232 one by one, and each group of right jet passages 240 is connected to the right axial passage 231 through each group of right connecting passages 232, and seven groups of right injection outlets 242 are evenly spaced at the blade top of the right rotor component 220.

[0093] Furthermore, if Figures 1 to 8As shown, based on the 8-shaped profile of the right rotor component, it includes two right blades, so that each group of right jet channels 240 includes two right jet sub-channels 242, and the two right jet sub-channels 242 are respectively arranged on each right blade of the right rotor component 220, that is, one right jet sub-channel 242 is arranged on one right blade, so that when each right blade on the right rotor component contacts the inner wall of the pump casing, a jet will be ejected.

[0094] For further information, please refer to Figures 1 to 8 , two right connecting sub-channels 232a penetrating the wall thickness of the right rotating shaft 210 are provided, and each right connecting sub-channel 232a is correspondingly connected with each right jet sub-channel 241 to form a right arc-shaped channel 160. In other words, a right arc-shaped channel 160 is opened from the right axial channel of the right rotating shaft to the blade tip direction of the right blade, and the bending and extending direction of the right arc-shaped channel 160 is the same as the rotation direction of the right rotor. For example, when the right rotating shaft rotates clockwise, the right arc-shaped channel on the right rotor component bends and extends in the clockwise direction, which is opposite to the bending and extending direction of the left arc-shaped channel.

[0095] In some preferred embodiments, Figure 3 and Figure 8 As shown, the arc radius of the right arc-shaped channel 160 is 20-120 mm, and can also be set according to the size of the right rotor component and the right rotating shaft. The arc radius of the right arc-shaped channel is the same as the arc radius of the left arc-shaped channel, for example, 45 mm is preferred.

[0096] In other preferred embodiments, Figure 8 As shown, the inner diameter of the right arc-shaped channel 160 is 0.05-2 mm. The inner diameter of the right arc-shaped channel can be the same as that of the left arc-shaped channel, for example, 2 mm. Of course, the inner diameter of the right arc-shaped channel can also be different from that of the left arc-shaped channel.

[0097] In other preferred embodiments, Figure 7 As shown, the length of the right axial channel 231 is 10% to 80% of the length of the right rotating shaft 210. The length of the right axial channel can be the same as the length of the left axial channel, for example, preferably 80%. Of course, the length of the right axial channel can also be different from the length of the left axial channel, which can be determined according to the number of right jet channels that need to be set.

[0098] In other preferred embodiments, Figures 1 to 4 As shown, the distance between the right air inlet of the right air inlet channel 230 and the first group of right jet channels 240 in the right rotor component 220 is 40% to 60% of the length of the right rotating shaft 210, preferably 40%.

[0099] In other preferred embodiments, Figures 1 to 3 As shown, the distance between the right injection outlet 241 and the axial center of the right rotating shaft 210 is 4 to 20 mm, preferably 20 mm.

[0100] It should be understood that this embodiment 1 is explained by taking a first-stage rotor component provided on the rotating shaft as an example. In other embodiments, it can also be a multi-stage rotor component. A group of jet channels can be provided on each stage of the rotor component, or multiple groups of jet channels can be provided, etc. Correspondingly, one or more groups of connecting channels should be provided on the rotating shaft, and the multiple groups of connecting channels can be distributed at equal intervals or at unequal intervals.

[0101] Example 2

[0102] The Roots vacuum pump comprises a pump housing and a left rotor and a right rotor arranged in the pump housing. The left rotor and the right rotor both comprise a primary rotor component, and the rotor component has three blades, and the three blades are evenly spaced and have a Y-shaped outer contour.

[0103] The left rotor includes a left rotating shaft and a first-stage left rotor component arranged axially upward along the left rotating shaft, and the left rotor component has three left blades. The left rotating shaft is provided with a left air inlet channel along its axial direction, and the left air inlet channel includes a left axial channel arranged axially along the left rotating shaft and a plurality of groups of left connecting channels equidistantly distributed along the axial direction of the left axial channel. Correspondingly, a plurality of groups of left jet channels are arranged equidistantly along the axial direction of the left rotor component, and each group of left jet channels corresponds to each group of left connecting channels one by one, and the left injection inlet of each group of left jet channels is connected to the left axial channel through each group of left connecting channels, and a plurality of groups of left injection outlets are provided at the blade top of the left rotor component.

[0104] Similarly, the right rotor includes a right rotating shaft and a right rotor component arranged axially upward along the right rotating shaft, the right rotor component having three right blades, and its profile is Y-shaped. The right rotating shaft is provided with a right air intake channel along its axial direction, the right air intake channel includes a right axial channel arranged axially along the right rotating shaft and a plurality of right connecting channels equidistantly distributed along the axial direction of the right axial channel. Correspondingly, a plurality of right jet channels are evenly spaced along the axial direction of the right rotor component, each group of right jet channels corresponds to each group of right connecting channels one by one, and the right injection inlet of each group of right jet channels is connected to the right axial channel through each group of right connecting channels, and a plurality of right injection outlets are provided at the blade top of the right rotor component.

[0105] It should be noted that this embodiment does not specifically limit the number of groups of the left jet channel, the left connecting channel, the right jet channel, and the right connecting channel. For example, three groups, five groups, seven groups, etc. can be set according to the size of the rotor.

[0106] Furthermore, based on the fact that the left rotor component includes three left blades, each group of left jet channels includes three left jet sub-channels, and the three left jet sub-channels are respectively arranged on each left blade of the left rotor component, and a left injection outlet is arranged at the blade top of each left blade. Secondly, three left connecting sub-channels penetrating the wall thickness are arranged on the left rotating shaft, and the three left connecting sub-channels are evenly spaced along the circumference of the left rotating shaft. As a group of left connecting channels, each left connecting sub-channel is correspondingly connected with each left jet sub-channel to form a left arc channel, and the bending and extending direction of the left arc channel is the same as the rotation direction of the left rotor. That is to say, when the left rotor rotates in the counterclockwise direction, a plurality of groups of left jet channels that bend and extend in the counterclockwise direction are arranged on the left rotor component, and each group of left jet channels includes three left jet sub-channels that bend and extend in the counterclockwise direction.

[0107] Similarly, each group of right jet channels includes three right jet sub-channels, which are respectively arranged on each right blade of the right rotor component, and a right jet outlet is arranged at the blade top of each right blade. Secondly, three right connecting sub-channels penetrating the wall thickness are arranged on the right rotating shaft, and the three right connecting sub-channels are evenly spaced along the circumference of the right rotating shaft. As a group of right connecting channels, each right connecting sub-channel is correspondingly connected with each right jet sub-channel to form a right arc channel, and the bending and extending direction of the right arc channel is the same as the rotation direction of the right rotor.

[0108] It should be noted that this embodiment does not specifically limit the number of stages of the rotor component. It can be a single-stage rotor component or a multi-stage rotor component. When a multi-stage rotor component is arranged on the rotating shaft, one or more groups of jet channels can be arranged on each stage of the rotor component.

[0109] It should be further explained that the arc radius of the arc channel, the inner diameter of the channel, the length of the axial channel, the distance between the right jet outlet and the axial center of the rotating shaft, and the distance between the air inlet of the air inlet channel and the first group of jet channels in the rotor component in this embodiment can all be referred to the previous records and can be set according to the specific size of the rotor, and no specific limitation is made here.

[0110] Example 3

[0111] The Roots vacuum pump comprises a pump housing and a left rotor and a right rotor arranged in the pump housing. The left rotor and the right rotor both comprise a primary rotor component, and the rotor component has five blades, and the five blades are evenly spaced.

[0112] The left rotor includes a left rotating shaft and a left rotor component arranged axially along the left rotating shaft, and the left rotor component has five left blades. The left rotating shaft is provided with a left air inlet channel along its axial direction, and the left air inlet channel includes a left axial channel arranged axially along the left rotating shaft and a plurality of left connecting channels equidistantly distributed along the axial direction of the left axial channel. Correspondingly, a plurality of left jet channels are arranged equidistantly along the axial direction of the left rotor component, and each group of left jet channels corresponds to each group of left connecting channels one by one, and the left injection inlet of each group of left jet channels is connected to the left axial channel through each group of left connecting channels, and a plurality of left injection outlets are correspondingly arranged at the blade top of the left rotor component. That is to say, when the left rotor rotates in the counterclockwise direction, a plurality of left jet channels that bend and extend in the counterclockwise direction are arranged on the left rotor component, and each group of left jet channels includes five left jet sub-channels that bend and extend in the counterclockwise direction.

[0113] Similarly, the right rotor includes a right rotating shaft and a right rotor component arranged axially upward along the right rotating shaft, and the right rotor component has five blades. The right rotating shaft is provided with a right air intake channel along its axial direction, and the right air intake channel includes a right axial channel arranged axially along the right rotating shaft and a plurality of right connecting channels equidistantly distributed along the axial direction of the right axial channel. Correspondingly, a plurality of right jet channels are arranged equidistantly along the axial direction of the right rotor component, and each group of right jet channels corresponds to each group of right connecting channels one by one, and the right injection inlet of each group of right jet channels is connected to the right axial channel through each group of right connecting channels, and a plurality of right injection outlets are provided at the blade top of the right rotor component.

[0114] It should be noted that this embodiment does not specifically limit the number of groups of the left jet channel, the left connecting channel, the right jet channel, and the right connecting channel. For example, two groups, three groups, four groups, five groups, etc. can be set according to the size of the rotor.

[0115] Furthermore, based on the fact that the left rotor component includes five left blades, each group of left jet channels includes five left jet sub-channels, and the five left jet sub-channels are respectively arranged on each left blade of the left rotor component, and a left injection outlet is arranged at the blade top of each left blade. Secondly, five left connecting sub-channels penetrating the wall thickness are arranged on the left rotating shaft, and the five left connecting sub-channels are evenly spaced along the circumference of the left rotating shaft. As a group of left connecting channels, each left connecting sub-channel is correspondingly connected with each left jet sub-channel to form a left arc channel, and the bending and extending direction of the left arc channel is the same as the rotation direction of the left rotor. For example, when the left rotating shaft rotates counterclockwise, the left arc channel on the left rotor component bends and extends counterclockwise.

[0116] Similarly, each group of right jet channels includes five right jet sub-channels, which are respectively arranged on each right blade of the right rotor component, and a right injection outlet is arranged at the blade top of each right blade. Secondly, five right connecting sub-channels penetrating the wall thickness are arranged on the right rotating shaft, and the five right connecting sub-channels are evenly spaced along the circumference of the right rotating shaft. As a group of right connecting channels, each right connecting sub-channel is connected to each right jet sub-channel to form a right arc channel, and the bending and extending direction of the right arc channel is the same as the rotation direction of the right rotor. For example, when the right rotating shaft rotates clockwise, the right arc channel eye on the right rotor component bends and extends in the clockwise direction.

[0117] It should be noted that this embodiment does not specifically limit the number of stages of the rotor component. It can be a single-stage rotor component or a multi-stage rotor component. When a multi-stage rotor component is arranged on the rotating shaft, one or more groups of jet channels can be arranged on each stage of the rotor component.

[0118] It should be further explained that the arc radius of the arc channel, the inner diameter of the channel, the length of the axial channel, the distance between the right jet outlet and the axial center of the rotating shaft, and the distance between the air inlet of the air inlet channel and the first group of jet channels in the rotor component in this embodiment can all be referred to the previous records and can be set according to the specific size of the rotor, and no specific limitation is made here.

[0119] The present disclosure provides a Roots vacuum pump rotor and a Roots vacuum pump, which have the following beneficial effects compared with the prior art:

[0120] First, the present invention forms a high-energy jet by adding a jet structure with an opening on the rotor and introducing external gas, thereby ensuring that the rotor has sufficient energy during the rotation process to form an effective airflow blockage.

[0121] Second, the jet direction formed by the present invention is opposite to the leakage flow generated by the pressure difference at the gap, which can significantly reduce the leakage loss at the blade tip gap.

[0122] Third, when the rotor of the present invention rotates to a position close to the exhaust port, a powerful jet mixes with the main fluid, increasing the density of gas molecules in the area, resulting in an increase in the number of collisions between molecules and between molecules and the container wall, thereby generating a higher pressure in the area, thereby increasing the pressure near the outlet side, helping the internal pressure of the pump casing to reach equilibrium with the external pressure more quickly, and effectively suppressing backflow shock and pressure fluctuations at the outlet.

[0123] Fourth, the present invention reduces the heat load in the blade tip area by setting a jet channel on the rotor. As the jet fluid expands along the inner wall of the pump casing, it can take away local heat close to the inner wall of the pump casing, thereby controlling the internal temperature of the pump casing and achieving a cooling effect. This not only helps to maintain the temperature stability of the equipment, but also improves the overall efficiency and extends the service life of the equipment.

[0124] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A Roots vacuum pump rotor, characterized in that: The Roots vacuum pump rotor includes a rotating shaft and at least one rotor component arranged axially along the rotating shaft; wherein, The rotating shaft is provided with an air inlet passage along its axial direction; The rotor component of any stage is provided with at least one group of jet channels along its axial direction, the jet inlet of the jet channel is connected with the air inlet channel, and the jet outlet of the jet channel is located at the blade top of the rotor component; An external gas source flows into the jet channel along the air inlet channel, and a jet is ejected through the jet outlet. The jet movement direction of the jet outlet is consistent with the rotation direction of the Roots vacuum pump rotor.

2. The Roots vacuum pump rotor according to claim 1, characterized in that: The jet channel bends and extends from the jet inlet to the jet outlet, and the bending and extending direction is the same as the rotation direction of the Roots vacuum pump rotor.

3. The Roots vacuum pump rotor according to claim 1, characterized in that: The air inlet passage comprises an axial passage arranged axially along the rotating shaft, and at least one group of connecting passages distributed axially along the axial passage; wherein, The injection inlet of each group of the jet channels is connected to the axial channel through each group of the connecting channels.

4. The Roots vacuum pump rotor according to claim 3, characterized in that: The rotor component of any stage is provided with a plurality of groups of jet channels at intervals along its axial direction, and the rotating shaft is provided with a plurality of groups of connecting channels at intervals along its axial direction; The multiple groups of jet channels correspond one to one to the multiple groups of connecting channels.

5. The Roots vacuum pump rotor according to claim 4, characterized in that: Any group of the connecting channels comprises a plurality of connecting sub-channels, and the plurality of connecting sub-channels are distributed at intervals along the circumference of the rotating shaft; A plurality of blades of the rotor component at any stage are provided with jet sub-channels, and the plurality of jet sub-channels correspond one-to-one to the plurality of connecting sub-channels to form a plurality of arc-shaped channels.

6. The Roots vacuum pump rotor according to claim 5, characterized in that: The arc radius of the arc channel is 20 to 120 mm; and / or, The inner diameter of the arc-shaped channel is 0.05 to 2 mm; and / or, The length of the axial channel is 10% to 80% of the length of the rotating shaft.

7. The Roots vacuum pump rotor according to claim 6, characterized in that: The distance between the air inlet of the air inlet channel and the first group of jet channels in the first-stage rotor component is 40% to 60% of the length of the rotating shaft.

8. The Roots vacuum pump rotor according to any one of claims 1 to 6, characterized in that: The distance between the injection outlet and the rotation axis is 4 to 20 mm.

9. The Roots vacuum pump rotor according to any one of claims 1 to 6, characterized in that: A primary rotor component is arranged axially on the rotating shaft; wherein, In this stage, the rotor component is provided with a plurality of groups of jet channels at equal intervals along its axial direction.

10. A Roots vacuum pump, characterized in that: The Roots vacuum pump comprises: a pump housing and a left rotor and a right rotor arranged in the pump housing; wherein, The left rotor and the right rotor adopt the Roots vacuum pump rotor according to any one of claims 1 to 9.

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