Split type rotor and split type roots pump

Abstract

The utility model discloses a split-type rotor and a split-type roots pump, relates to the technical field of vacuum pumps, and provides a split-type rotor and a split-type roots pump which are characterized in that a blade unit can be flexibly arranged and assembled with a core shaft so as to meet the requirements of diversified application scenes. The axial positioning precision of the blade unit is accurately controlled through an axial limiting device formed by the stepless adjustable thread meshing limiting sleeves at the two ends of the mandrel, the problem of axial movement of the blade unit in the operation process is avoided, and the assembling and positioning process is simplified. The separation unit adopts a shaft shoulder or a shaft sleeve with adjustable spacing, and provides flexible axial positioning for the blade unit. The circumferential limiting structure thoroughly eliminates free rotation of the blade units through a key and groove matching structure, and the geometric accuracy of synchronous rotation at a high rotating speed is ensured. When the split-type rotor is applied to the split-type roots pump, the split-type rotor corresponds to a plurality of working cavities arranged in the pump body in a one-to-one mode, and the gas conveying efficiency under the unit torque is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically to a split rotor and a split Roots pump. Background Technology

[0002] In existing Roots pump technology, the rotor typically employs an integral structure. Integral rotors usually have a fixed and singular number of impeller blades, lacking flexibility and making it difficult to adjust and combine them according to different operating conditions and application scenarios, thus limiting the pump's applicability. If a multi-impeller structure or specific dimensional gradient is required, custom machining is necessary, resulting in high costs.

[0003] Therefore, there is an urgent need for a new type of Roots pump that can achieve flexible impeller configuration, ensure the reliability of synchronous operation of multiple impellers, and simplify the manufacturing and maintenance process of the pump body. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned problems by providing a split rotor and a split Roots pump. Through the split structure design and pump body construction, this utility model effectively solves the problem that the number of impeller blades in an integral rotor is usually fixed and singular, lacking flexibility and making it difficult to adjust and combine according to the needs of different working conditions and application scenarios, thus limiting the pump's applicability.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A split rotor and a split Roots pump include a mandrel and multiple blade units. The multiple blade units are fitted onto the mandrel through sleeve holes, and a separation unit is provided between adjacent blade units. Axial limiting devices that can restrict the axial displacement of the blade units are respectively provided at both ends of the mandrel. The paired axial limiting devices cooperate with each other to restrict the multiple blade units on the mandrel.

[0007] Thanks to the above technical solutions, the blade unit can be flexibly set up and assembled with the mandrel to meet the needs of diverse application scenarios. Through the cooperation of the double-end axial limiting device and the partition unit, the axial positioning accuracy of the blade unit can be precisely controlled, avoiding the problem of axial movement of the blade unit during operation. At the same time, it is convenient to quickly position the initial position of each blade unit during assembly.

[0008] Furthermore, the axial limiting device includes a limiting sleeve fitted around the outer periphery of the mandrel and an external thread on the mandrel. The limiting sleeve has a limiting hole, and the inner wall of the limiting hole has an internal thread. The limiting sleeve can be fitted onto the mandrel through the limiting hole, and the axial position of the limiting sleeve on the mandrel is limited by the engagement of the internal thread and the external thread.

[0009] Thanks to the above technical solution, the threaded limiting sleeve can achieve stepless adjustment of the axial limiting device, which solves the assembly difficulties caused by machining errors in traditional fixed limiting structures. At the same time, the axial position can be positioned by rotating and adjusting the limiting sleeve, making assembly convenient.

[0010] Furthermore, each leaf unit has N leaves, where N is an integer greater than or equal to 2.

[0011] Thanks to the above technical solution, the number of blades in the leaf unit can be set according to requirements and assembled arbitrarily, adapting to the needs of more application scenarios.

[0012] Furthermore, the dividing unit is a shoulder of the mandrel or a bushing fitted around the outer periphery of the mandrel.

[0013] Thanks to the above technical solution, the blade unit can be axially positioned on the mandrel through both the shoulder and the bushing. When the bushing is used as a separating unit, the spacing between adjacent blade units can be adjusted as needed to achieve adjustable separation distance.

[0014] Furthermore, the mandrel is provided with a circumferential limiting structure that can restrict the circumferential rotation of the blade unit.

[0015] Thanks to the above technical solution, the possibility of free rotation of the blade unit on the mandrel can be completely eliminated by the circumferential limiting structure, ensuring the geometric accuracy requirement of synchronous rotation of multiple blade units during operation.

[0016] Furthermore, the circumferential limiting structure includes a first positioning groove on the circumferential surface of the mandrel, a second positioning groove on the inner wall of the blade unit sleeve hole, and a positioning key assembled between the first positioning groove and the second positioning groove.

[0017] Thanks to the above technical solution, the key and slot connection structure can maintain the tight fit between the positioning key and the positioning slot even under high-speed conditions, thus avoiding the problem of circumferential deflection of the blade unit.

[0018] A split-type Roots pump includes a pump body, in which a pair of split rotors are assembled. The blade units of the pair of split rotors mesh with each other to form a vane pump assembly. The pump body is provided with multiple working chambers, each working chamber corresponding to a vane pump assembly.

[0019] By adopting the above technical solution and through the corresponding design of split rotor and multiple working chambers, the volume limitation of the single chamber of the traditional Roots pump is broken, and the gas delivery efficiency under unit torque is significantly improved.

[0020] Furthermore, the pump body includes a first cylinder and a second cylinder that can be mated with each other. Multiple shaft grooves are provided along the length direction on the mating surfaces of the first and second cylinders. These shaft grooves are parallel to each other and spaced apart. The spacing between the shaft grooves matches the size of the blade unit. Working grooves are provided between the shaft grooves located on the same axis along the length direction of the pump body. The shaft grooves on the first cylinder correspond to the shaft grooves on the second cylinder, and each working groove on the first cylinder corresponds one-to-one with a working groove on the second cylinder. When the first and second cylinders are mated, the shaft grooves on the first cylinder and the shaft grooves on the second cylinder cooperate to form a shaft assembly cavity that can be matched with the spindle. The working grooves on the first cylinder and the corresponding working grooves on the second cylinder cooperate to form a working cavity that can be matched with the blade unit.

[0021] Thanks to the above technical solution, the first cylinder and the second cylinder adopt a mating structure, which allows the shaft groove and the working groove on them to be integrally formed by casting. This solves the problem of precision casting of pump body for multi-blade unit split rotor, and at the same time, it can be quickly disassembled to clean or replace worn parts.

[0022] Furthermore, the maximum radial dimension of the outer circular contour of the blade unit relative to the mandrel is denoted as the rotation dimension. The rotation dimension of one blade unit along the gas flow direction is greater than or equal to the rotation dimension of the next blade unit, and the number of blades in the previous blade unit is less than or equal to the number of blades in the next blade unit.

[0023] By adopting the above technical solution, the blade units with progressively decreasing rotational dimensions and progressively increasing number of blades in the blade units can form a gradually expanding working channel similar to a diffuser. This allows the gas to undergo a continuous expansion process rather than abrupt compression when passing through adjacent blade units, significantly reducing the turbulence of the airflow velocity field and thus reducing pressure pulsation and vibration noise.

[0024] Furthermore, the thickness of the leaf units with the same number of leaves decreases sequentially along the direction of gas flow.

[0025] By adopting the above technical solution and through thickness design, the degree of turbulence in the airflow velocity field is further reduced, thereby reducing pressure pulsation and vibration noise.

[0026] In summary, due to the adoption of the above technical solutions, the beneficial effects of this utility model are as follows: the blade unit can be flexibly configured and assembled with the mandrel to meet the needs of diverse application scenarios. The axial limiting device, composed of infinitely adjustable threaded engagement limiting sleeves at both ends of the mandrel, precisely controls the axial positioning accuracy of the blade unit, avoiding axial movement of the blade unit during operation and simplifying the assembly and positioning process. The partition unit uses a shoulder or adjustable-pitch bushing to provide flexible axial positioning for the blade unit. The circumferential limiting structure, through the key and groove fit, completely eliminates free rotation of the blade unit, ensuring geometric accuracy of synchronous rotation at high speeds. When applied to a split-type Roots pump, the split rotor corresponds one-to-one with the multiple working chambers set in the pump body, significantly improving the gas delivery efficiency per unit torque. The pump body adopts a first and second cylinder structure that can be matched, and the shaft groove and working groove on it can be integrally formed by casting, solving the precision casting problem of multi-blade unit split rotor pump bodies, facilitating quick disassembly, cleaning, or component replacement. The rotational dimensions of the blade unit decrease sequentially along the spindle axis, while the number of blades in the blade unit increases progressively. Furthermore, the thickness of the blade unit with the same number of blades decreases sequentially along the gas flow direction, forming a gradually narrowing working channel. This allows the gas to undergo continuous expansion, reducing airflow turbulence, pressure pulsation, and vibration noise. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the split rotor of this utility model;

[0028] Figure 2 This is a cross-sectional view of the split rotor of this utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the leaf unit of this utility model;

[0030] Figure 4 This is a schematic diagram of the pump body of this utility model;

[0031] Figure 5 This is a front view of the first cylinder block of this utility model;

[0032] Figure 6 This is a top view of the first cylinder block of this utility model;

[0033] Figure 7 This is a schematic diagram of the structure of the first cylinder block of this utility model;

[0034] Figure 8 This is an assembly drawing of the pump body and the split rotor of this utility model.

[0035] The markings in the diagram are: 1-mandrel, 2-blade unit, 201-sleeve hole, 3-separation unit, 4-circumferential limiting structure, 401-first positioning groove, 402-second positioning groove, 403-positioning key, 5-axial limiting device, 501-limiting hole, 6-pump body, 601-first cylinder, 602-second cylinder, 603-shaft groove, 604-working groove. Detailed Implementation

[0036] The present invention will now be described in detail with reference to the accompanying drawings.

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] Example 1

[0039] A split rotor, such as Figures 1-3 As shown, it includes a mandrel 1 and seven blade units 2. The seven blade units 2 are fitted onto the mandrel 1 through a sleeve hole 201. A separator unit 3 is provided between adjacent blade units 2. Axial limiting devices 5 that can limit the axial displacement of the blade units 2 are respectively provided at both ends of the mandrel 1. The paired axial limiting devices 5 cooperate with each other to limit the seven blade units 2 to the mandrel 1.

[0040] Specifically, the blade unit 2 can be flexibly set up and assembled with the spindle 1 to meet the needs of diverse application scenarios; through the cooperation of the double-end axial limiting device 5 and the dividing unit 3, the axial positioning accuracy of the blade unit 2 can be precisely controlled to avoid the problem of axial movement of the blade unit 2 during operation, and at the same time, it is convenient to quickly position the initial position of each blade unit 2 during assembly.

[0041] The axial limiting device 5 includes a limiting sleeve fitted around the outer periphery of the mandrel 1 and an external thread on the mandrel 1. The limiting sleeve is provided with a limiting hole 501, and the inner wall of the limiting hole 501 is provided with an internal thread. The limiting sleeve can be fitted onto the mandrel 1 through the limiting hole 501, and the axial position of the limiting sleeve on the mandrel 1 is limited by the engagement of the internal thread and the external thread.

[0042] Specifically, the threaded limiting sleeve enables stepless adjustment of the axial limiting device 5, solving the assembly difficulties caused by machining errors in traditional fixed limiting structures. At the same time, the axial position can be positioned by rotating and adjusting the limiting sleeve, making assembly convenient.

[0043] Each leaf unit 2 has N leaves, where N is an integer greater than or equal to 2.

[0044] Specifically, this allows the number of leaves in leaf unit 2 to be set according to requirements, and can be assembled arbitrarily to adapt to the needs of more application scenarios. Figure 1 The number of leaves in the middle leaf unit 2 is two leaves, four leaves, and five leaves along the axial direction.

[0045] The dividing unit 3 is the shoulder of the mandrel 1 or a sleeve fitted around the outer periphery of the mandrel 1.

[0046] Specifically, the blade unit 2 can be axially positioned on the spindle 1 through both the shoulder and the bushing. When the bushing is used as a separating unit 3, the spacing between adjacent blade units 2 can be adjusted as needed to achieve adjustable separation distance.

[0047] The spindle 1 is provided with a circumferential limiting structure 4 that can restrict the circumferential rotation of the leaf unit 2.

[0048] Specifically, the circumferential limiting structure 4 can completely eliminate the possibility of free rotation of the blade unit 2 on the spindle 1, ensuring the geometric accuracy requirement of synchronous rotation of multiple blade units 2 during operation.

[0049] The circumferential limiting structure 4 includes a first positioning groove 401 on the circumferential surface of the spindle 1, a second positioning groove 402 on the inner wall of the sleeve hole 201 of the blade unit 2, and a positioning key 403 assembled between the first positioning groove 401 and the second positioning groove 402.

[0050] Specifically, through the key-slot connection structure, the tight fit between the positioning key 403 and the positioning slot can be maintained even under high-speed operating conditions, thus avoiding the problem of circumferential deflection of the blade unit 2.

[0051] Example 2

[0052] A split-type Roots pump, such as Figures 1-8 As shown, the pump body 6 includes a pump body 6, which is equipped with a pair of split rotors provided in Embodiment 1. The blade units 2 of the pair of split rotors mesh with each other to form a blade pump assembly. The pump body 6 is provided with seven working chambers, and each working chamber corresponds to a blade pump assembly.

[0053] Specifically, by using a split rotor and a multi-chamber design, the volume limitation of a single chamber in a traditional Roots pump is broken, significantly improving the gas delivery efficiency per unit torque.

[0054] The pump body 6 includes a first cylinder 601 and a second cylinder 602 that can be mated with each other. Multiple shaft grooves 603 are provided along the length direction on the mating surfaces of the first cylinder 601 and the second cylinder 602. The multiple shaft grooves 603 are parallel to each other and spaced apart. The spacing of the multiple shaft grooves 603 matches the size of the blade unit 2. A working groove 604 is provided between the multiple shaft grooves 603 located on the same axis along the length direction of the pump body 6. The shaft grooves 603 on the first cylinder 601 and the shaft grooves 603 on the second cylinder 602 are... The rotating shaft groove 603 corresponds to the working groove 604 on the first cylinder 601, and the working groove 604 on the second cylinder 602 corresponds one-to-one. When the first cylinder 601 and the second cylinder 602 are engaged, the rotating shaft groove 603 on the first cylinder 601 and the rotating shaft groove 603 on the second cylinder 602 cooperate to form a rotating shaft assembly cavity that can be matched with the mandrel 1. The working groove 604 on the first cylinder 601 and the corresponding working groove 604 on the second cylinder 602 cooperate to form a working cavity that can be matched with the blade unit 2. That is, two sets of rotating shaft assembly cavities and seven working cavities will be formed in the end. Each set of rotating shaft assembly cavities is used to install two mandrels 1 in pairs. The two sets of rotating shaft assembly cavities are parallel to each other and penetrate through the working cavities. There is a gap between the two sets of rotating shaft assembly cavities.

[0055] Specifically, the first cylinder 601 and the second cylinder 602 adopt a mating structure, which allows the shaft groove 603 and the working groove 604 on them to be integrally formed by casting, solving the precision casting problem of the pump body 6 of the split rotor of the multi-blade unit 2. At the same time, it can be quickly disassembled to clean or replace worn parts.

[0056] The maximum radial dimension of the outer circle contour of the leaf unit 2 relative to the mandrel 1 is denoted as the rotation dimension. The rotation dimension of the first leaf unit 2 along the gas flow direction is greater than or equal to the rotation dimension of the next leaf unit 2, and the number of leaves of the previous leaf unit 2 is less than or equal to the number of leaves of the next leaf unit 2.

[0057] Specifically, the progressively decreasing rotational size of the blade unit 2, combined with the progressively increasing number of blades in the blade unit 2, can form a gradually expanding working channel similar to a diffuser. This allows the gas to undergo a continuous expansion process rather than abrupt compression when passing through adjacent blade units 2, significantly reducing the turbulence of the airflow velocity field and thus reducing pressure pulsation and vibration noise.

[0058] The thickness of the leaf unit 2 with the same number of leaves decreases sequentially along the direction of gas flow.

[0059] Specifically, by designing the thickness, the turbulence of the airflow velocity field is further reduced, thereby reducing pressure pulsation and vibration noise.

[0060] This document uses specific embodiments to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

[0061] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0062] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A split-type rotor, characterized in that, It includes a mandrel and multiple blade units. The multiple blade units are fitted onto the mandrel through sleeve holes, and a separator unit is provided between adjacent blade units. The two ends of the mandrel are respectively provided with axial limiting devices that can limit the axial displacement of the blade units. The paired axial limiting devices cooperate with each other to limit the multiple blade units on the mandrel.

2. The split rotor as described in claim 1, characterized in that, The axial limiting device includes a limiting sleeve fitted around the outer periphery of the mandrel and an external thread on the mandrel. The limiting sleeve has a limiting hole, and the inner wall of the limiting hole has an internal thread. The limiting sleeve can be fitted onto the mandrel through the limiting hole, and the axial position of the limiting sleeve on the mandrel is limited by the engagement of the internal thread and the external thread.

3. The split rotor as described in claim 1, characterized in that, The number of leaves in each leaf unit is N, where N is an integer greater than or equal to 2.

4. The split rotor as described in claim 1, characterized in that, The dividing unit is a shoulder of the mandrel or a sleeve fitted around the outer periphery of the mandrel.

5. The split rotor as described in claim 1, characterized in that, The mandrel is provided with a circumferential limiting structure that can restrict the circumferential rotation of the blade unit.

6. The split rotor as described in claim 5, characterized in that, The circumferential limiting structure includes a first positioning groove on the circumferential surface of the mandrel, a second positioning groove on the inner wall of the blade unit sleeve hole, and a positioning key assembled between the first positioning groove and the second positioning groove.

7. A split-type Roots pump, characterized in that, The pump body includes a pump body in which a pair of split rotors as described in any one of claims 1-6 are assembled. The blade units of the pair of split rotors mesh with each other to form a blade pump assembly. The pump body is provided with a plurality of working chambers, each working chamber corresponding to a blade pump assembly.

8. The split-type Roots pump as described in claim 7, characterized in that, The pump body includes a first cylinder and a second cylinder that can be mated with each other. Multiple shaft grooves are provided along the length of the mating surfaces of the first and second cylinders. These shaft grooves are parallel to each other and spaced apart. The spacing between the shaft grooves matches the size of the blade unit. Working grooves are provided between the shaft grooves located on the same axis along the length of the pump body. The shaft grooves on the first cylinder correspond to the shaft grooves on the second cylinder, and each working groove on the first cylinder corresponds one-to-one with a working groove on the second cylinder. When the first and second cylinders are mated, the shaft grooves on the first cylinder and the shaft grooves on the second cylinder cooperate to form a shaft assembly cavity that can be matched with the spindle. The working grooves on the first cylinder and the corresponding working grooves on the second cylinder cooperate to form a working cavity that can be matched with the blade unit.

9. The split-type Roots pump as described in claim 7, characterized in that, The maximum radial dimension of the outer circular contour of the blade unit relative to the mandrel is denoted as the rotation dimension. The rotation dimension of one blade unit along the gas flow direction is greater than or equal to the rotation dimension of the next blade unit, and the number of blades in the previous blade unit is less than or equal to the number of blades in the next blade unit.

10. The split-type Roots pump as described in claim 9, characterized in that, For blade units with the same number of blades, the thickness decreases sequentially along the direction of gas flow.

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