A dynamic balancing test tool for double-sided end tooth rotors and a test method thereof

Abstract

The embodiment of the application discloses a kind of for double-sided end tooth rotor dynamic balance test tool and its test method, including first fixing part, second fixing part and locking part, first fixing part has first matching tooth, first fixing part has positioning hole.Second fixing part is oppositely arranged with first fixing part, rotor is located between first fixing part and second fixing part, second fixing part has second matching tooth towards first matching tooth, and second fixing part has through hole.Locking part passes through through hole, positioning hole to make first fixing part and second fixing part be connected. Wherein, first matching tooth can, the end tooth of rotor and the meshing connection of second matching tooth in any two thereof. The test tool provided in the application can simulate the scene that end tooth center line is used as rotation center line in actual use process of rotor, and the accuracy of dynamic balance test detection of rotor can be improved.

Description

Technical Field

[0001] This application relates to the field of testing fixture technology, and in particular to a dynamic balancing testing fixture and testing method for a double-sided end-tooth rotor. Background Technology

[0002] Some new centrifugal compressors have a shaftless structure, meaning that the compressor's components are positioned and matched by end teeth.

[0003] Unlike traditional compressors that use a single main shaft as the positioning reference for all other components, in the new centrifugal compressor, each component is positioned relative to its adjacent components; that is, there is no single, unified positioning reference for all components.

[0004] However, unlike the internal bore positioning parts in traditional compressors, the actual rotation center line of the part based on end tooth positioning is the end tooth center line, which is a non-physical part and has the characteristics of being difficult to measure and utilize directly. Summary of the Invention

[0005] In view of this, this application aims to provide a dynamic balancing test fixture and test method for a double-sided end-tooth rotor, which solves the problem that it is difficult to perform balance testing for parts based on end-tooth positioning because there is no directly usable balance reference center line during the dynamic balancing process.

[0006] In a first aspect, this application provides a dynamic balancing test fixture for a double-sided end-tooth rotor, comprising a first fixing member, a second fixing member, and a locking member. The first fixing member has a first mating tooth and a positioning hole. The second fixing member is disposed opposite to the first fixing member, with the rotor located between the first and second fixing members. The second fixing member has a second mating tooth facing the first mating tooth and a through hole. The locking member passes through the through hole and the positioning hole to connect the first and second fixing members. The first mating tooth is capable of meshing with any two of the rotor's end teeth and the second mating tooth.

[0007] In one possible implementation, the first fixing member includes a first connecting portion and a first fixing portion. The first connecting portion extends axially and is used for mounting on a balancing machine. The first fixing portion is connected to the first connecting portion, and a first mating tooth is provided on the end face of the first fixing portion opposite to the first connecting portion. A positioning hole is formed axially on the first fixing portion.

[0008] In one possible implementation, the positioning hole is a blind hole.

[0009] In one possible implementation, the second fixing member includes a second connecting portion and a second fixing portion. The second connecting portion extends axially and is used for mounting on a balancing machine. The second fixing portion and the second connecting portion have a second mating tooth on their end face facing away from the second connecting portion, and a through hole is formed axially on the second connecting portion and the second fixing portion.

[0010] In one possible implementation, the locking element includes a locking screw and a locking nut, with the locking screw passing through a through hole and a positioning hole. The locking nut is fixedly connected to the end of the locking screw away from the first fixing element, thereby fixing the first fixing element and the second fixing element together.

[0011] Secondly, this application provides a dynamic balancing test method for a double-sided end-tooth rotor, which is implemented using the test fixtures provided in any of the above embodiments.

[0012] In one possible implementation, the testing method includes: Perform dynamic balancing tests and corrections on the test fixture until the dynamic balancing parameters of the test fixture meet the preset balancing parameters; The rotor was mounted on the test fixture, and multiple rounds of dynamic balancing tests were performed on the rotor. The balance state of the rotor is determined based on the results of multiple dynamic balancing tests.

[0013] In one possible implementation, the step of performing dynamic balancing tests and corrections on the test fixture until the dynamic balancing parameters of the test fixture meet the preset balancing parameters specifically includes: Assemble the first fastener, the second fastener, and the locking component to form a tooling assembly and record the alignment marks of the first fastener and the second fastener. The tooling assembly is installed on a balancing machine and a dynamic balancing test is conducted to obtain the initial dynamic balancing parameters. The first and second fixing components are adjusted with counterweights based on the initial dynamic balance parameters until the dynamic balance parameters of the tooling assembly meet the preset balance parameters.

[0014] In one possible implementation, the step of mounting the rotor on a test fixture and performing a multi-round dynamic balancing test on the rotor specifically includes: The rotor is installed between the first fixing member and the second fixing member to form a first test assembly, wherein the first fixing member and the second fixing member are assembled according to the mating marks, and the rotor is in the initial position corresponding to the mating marks; The first dynamic balancing test was performed on the first test assembly, and the first unbalance of the rotor was recorded. The rotor is rotated from its initial position to a preset angle to its rotational position to form the second test assembly. A second dynamic balancing test was conducted on the second test assembly, and the second unbalance of the rotor was recorded. The corrected imbalance of the rotor is determined based on the first imbalance and the second imbalance. The counterweight of the second test assembly was adjusted according to the corrected imbalance, and a third dynamic balancing test was conducted to record the third imbalance of the rotor. The rotor is rotated in the opposite direction from its rotating position by a preset angle to return it to its initial position, forming the first test assembly. The first test assembly underwent its fourth dynamic balancing test, and the fourth unbalance of the rotor was recorded.

[0015] In one possible implementation, the step of determining the rotor's balance state based on the results of a multi-round dynamic balancing test specifically includes: When the difference between the fourth and third unbalance quantities meets the preset error range, the rotor is determined to be in a balanced state.

[0016] Compared with the prior art, the beneficial effects of this application are: In the test fixture provided in this application, the first fixing member and the second fixing member are respectively meshed with the end teeth of the rotor, and the locking member ensures the axial positional stability of the first fixing member, the second fixing member and the rotor, thereby simulating the scenario in which the rotor uses the center line of the end teeth as the rotation center line during actual use, which can improve the accuracy of the rotor's dynamic balance test.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 An assembly diagram of the test fixture and rotor provided in the embodiments of this application; Figure 2 A schematic diagram of a test fixture provided for one embodiment of this application; Figure 3 A flowchart of a test method provided for one embodiment of this application; Explanation of reference numerals in the attached figures: 1 First fastener, 11 First connecting part, 12 First fixing part, 2. Second fastener, 21. Second connecting part, 22. Second fixing part 3. Locking components, 31. Locking screw, 32. Locking nut. 4 rotors. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0025] Firstly, this application provides a dynamic balancing test fixture for a double-sided end-tooth rotor 4, such as... Figure 1 and Figure 2 As shown, it includes a first fixing member 1, a second fixing member 2, and a locking member 3.

[0026] The first fixing member 1 has a first mating tooth and a positioning hole. The positioning hole is either a through hole or a blind hole.

[0027] The second fixing member 2 is positioned opposite to the first fixing member 1. The second fixing member 2 has a second mating tooth facing the first mating tooth. In the initial stage of the test, such as Figure 2 As shown, the first fixing member 1 and the second fixing member 2 are connected by the meshing of the first mating teeth and the second mating teeth, and the two are fixedly clamped. During the test, as... Figure 1 As shown, the rotor 4 is located between the first fixing member 1 and the second fixing member 2. Both ends of the rotor 4 are provided with end teeth, namely the first end tooth and the second end tooth. The first end tooth of the rotor 4 will mesh with the first mating tooth, and the second end tooth of the rotor 4 will mesh with the second mating tooth. The first fixing member 1, the rotor 4 and the second fixing member 2 are connected by teeth meshing between adjacent parts.

[0028] The second fixing member 2 has a through hole, which is coaxially arranged with the positioning hole.

[0029] In the early stages of the experiment, such as Figure 2 As shown, the locking member 3 passes through the through hole and the positioning hole to connect the first fixing member 1 and the second fixing member 2, thereby allowing dynamic balance testing of the first fixing member 1 and the second fixing member 2. During the test, as... Figure 1 As shown, the locking member 3 passes through the through hole, the inner cavity of the rotor 4, and the positioning hole, so that the first fixing member 1 and the second fixing member 2 clamp the rotor 4. The three are connected by tooth meshing, and under the action of the locking member 3, the three are stabilized in the axial direction to ensure the safe conduct of the dynamic balance test.

[0030] The first mating tooth can mesh with any two of the end teeth of the rotor 4 and the second mating tooth. The first fixing member 1 and the second fixing member 2 are respectively installed on the balancing machine, and the dynamic balance of the rotor 4 is detected by the action of the balancing machine.

[0031] In the test fixture provided in this application, the first fixing member 1 and the second fixing member 2 are respectively meshed with the end teeth of the rotor 4, and the locking member 3 ensures the axial positional stability of the first fixing member 1, the second fixing member 2 and the rotor 4, thereby simulating the scenario in which the rotor 4 takes the center line of the end teeth as the rotation center line during actual use, which can improve the accuracy of the dynamic balance test of the rotor 4.

[0032] In one possible implementation, such as Figure 1 and 2 As shown, the first fixing member 1 includes a first connecting portion 11 and a first fixing portion 12. The first connecting portion 11 extends axially. Specifically, the first connecting portion 11 has a columnar structure. The first connecting portion 11 is used to be mounted on the balancing machine.

[0033] The first fixing part 12 is connected to the first connecting part 11. A step is formed between the first fixing part 12 and the first connecting part 11. It is worth noting that the axial length of the first fixing part 12 is less than the axial length of the first connecting part 11.

[0034] Specifically, the first fixing part 12 has a first mating tooth on its end face opposite to the first connecting part 11, and a positioning hole is formed on the first fixing part 12 along the axial direction.

[0035] In one possible implementation, the positioning hole is a blind hole.

[0036] In one possible implementation, such as Figure 1 and 2 As shown, the second fixing member 2 includes a second connecting portion 21 and a second fixing portion 22. The second connecting portion 21 extends axially, and specifically, the second connecting portion 21 has a columnar structure. The second connecting portion 21 is used to be mounted on the balancing machine.

[0037] The second fixing part 22 and the second connecting part 21 are connected in a stepped position. It is worth noting that the axial length of the second fixing part 22 is less than the axial length of the second connecting part 21.

[0038] Specifically, the second fixing part 22 is provided with a second mating tooth on the end face away from the second connecting part 21. That is to say, the first mating tooth and the second mating tooth are respectively provided on the end faces of the first fixing member 1 and the second fixing member 2 that are close to each other.

[0039] The through holes are formed axially on the second connecting part 21 and the second fixing part 22.

[0040] In one possible implementation, such as Figure 1 and 2 As shown, the locking component 3 includes a locking screw 31 and a locking nut 32.

[0041] In the initial stage of the test, the locking screw 31 passes through the through hole and the positioning hole. The locking nut 32 is fixedly connected to the end of the locking screw 31 away from the first fixing member 1, so that the first fixing member 1 and the second fixing member 2 are fixedly connected.

[0042] In the initial stage of the test, the locking screw 31 passes through the through hole, the inner cavity of the rotor 4, and the positioning hole. The locking nut 32 is fixedly connected to the end of the locking screw 31 away from the first fixing member 1, so as to fix the first fixing member 1, the rotor 4, and the second fixing member 2.

[0043] Secondly, this application provides a dynamic balancing test method for a double-sided end-tooth rotor, which is implemented using the test fixtures provided in any of the above embodiments.

[0044] In one possible implementation, such as Figure 3 As shown, the test methods include: S1, Perform dynamic balancing tests and corrections on the test fixture until the dynamic balancing parameters of the test fixture meet the preset balancing parameters; S2, Install the rotor on the test fixture and perform a multi-round dynamic balancing test on the rotor; S3. Based on the results of the multi-round dynamic balancing test, determine the balance state of the rotor.

[0045] The test method provided in this application first performs a dynamic balancing test on the test fixture itself in the initial stage of the test. When the dynamic balancing parameters do not meet the preset balancing parameters, it indicates that the test fixture itself is unbalanced. Therefore, it is necessary to perform dynamic balancing correction on the test fixture itself to make the test fixture itself meet the preset balancing parameters and ensure that the test fixture will not affect the accuracy of the rotor's dynamic balancing test.

[0046] When the test fixture is in a balanced state, the rotor is then assembled onto the test fixture for dynamic balancing tests. Multiple rounds of dynamic balancing tests are conducted on the rotor at different positions, and the balance state of the rotor is determined based on the results of the multiple rounds of dynamic balancing tests.

[0047] In one possible implementation, the step of performing dynamic balancing tests and corrections on the test fixture until the dynamic balancing parameters of the test fixture meet the preset balancing parameters specifically includes: Assemble the first fastener, the second fastener, and the locking component to form a tooling assembly and record the alignment marks of the first fastener and the second fastener.

[0048] Before conducting the dynamic balancing test, the experimenters need to visually inspect the surface of each component of the test fixture for defects such as bumps, scratches, oil stains, and debris. If there are no defects, the test fixture is cleaned to ensure the cleanliness and appearance quality of each component.

[0049] Next, a contact check is performed on the first mating teeth of the first fixing member, the second mating teeth of the second fixing member, and the end teeth of the rotor to ensure that the contact area of ​​the contact surfaces between adjacent parts meets the requirements during assembly.

[0050] Then, the first fixing component, the second fixing component, and the locking component are assembled together to form a tooling assembly. A mating mark is made at a specific position where the first and second mating teeth are engaged. This mating mark ensures that, during testing, when the rotor is installed between the first and second mating teeth, the positions of the first and second mating teeth remain at the mating mark. The tooling assembly is then placed on a dial indicator machine for runout testing.

[0051] The tooling assembly is installed on a balancing machine and a dynamic balancing test is conducted to obtain the initial dynamic balancing parameters.

[0052] The first and second fixing parts are adjusted by counterweights according to the initial dynamic balance parameters until the dynamic balance parameters of the tooling assembly meet the preset balance parameters, thus completing the dynamic balance test of the test tooling itself.

[0053] In one possible implementation, the step of mounting the rotor on a test fixture and performing a multi-round dynamic balancing test on the rotor specifically includes: The rotor is installed between the first fixing member and the second fixing member to form the first test assembly. The first fixing member and the second fixing member are assembled according to the mating marks, and the rotor is aligned with the mating marks. At this time, the rotor is in the initial position, which can be marked as "0".

[0054] Specifically, during the disassembly of the test fixture, only the locking nuts in the second fixing component and the locking component are disassembled, while the first fixing component and the locking screw remain in their original installation positions, so as to minimize the errors introduced by the test fixture.

[0055] The first dynamic balancing test was performed on the first test assembly, and the first unbalance of the rotor was recorded and defined as a vector. It is understandable that vectors can be represented by angles and weights.

[0056] The rotor is rotated from its initial position to a preset angle to a rotating position, forming the second test assembly. Specifically, the preset angle is 180°.

[0057] Before rotating the rotor, the second fixing component and locking nut must be removed, while keeping the positions of the first fixing component and locking screw unchanged, and the rotor rotated 180° around the central axis. Then, the second fixing component and locking nut are installed and tightened. In other words, apart from the change in the rotor's position, the relative angles of the components in the test fixture and the first test assembly remain unchanged.

[0058] A second dynamic balancing test was conducted on the second test assembly, and the second unbalance of the rotor was recorded and defined as a vector. ; Based on the first and second imbalances, the corrected imbalance of the rotor is determined and defined as a vector. ; The counterweight of the second test assembly was adjusted based on the corrected imbalance, and a third dynamic balancing test was conducted, recording the third imbalance of the rotor. ; The rotor is rotated in the opposite direction from its rotating position by a preset angle to return it to its initial position, forming the first test assembly. The first test assembly underwent its fourth dynamic balancing test, and the fourth unbalance of the rotor was recorded. .

[0059] In one possible implementation, the step of determining the rotor's balance state based on the results of a multi-round dynamic balancing test specifically includes: When the difference between the fourth and third unbalance quantities meets the preset error range, the rotor is determined to be in a balanced state. Specifically, when ≈ This can be considered as the balancing work of item 1 being completed.

[0060] It is worth noting that this application uses experimental fixtures to simulate the assembly state, indirectly utilizing the end tooth centerline as a balancing reference, thus solving the problem that non-physical references cannot be directly used. Employing a two-stage installation and vector calculation method, it effectively separates the part's own imbalance from the fixture system error, significantly improving balancing accuracy. Through marking control, repeated assembly, and verification steps, the consistency and reliability of the balancing results are ensured, making it suitable for mass production. It is particularly suitable for rotor structures with multi-segment end tooth fits and no unified spindle, providing a feasible dynamic balancing solution for the design of new compressors.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A dynamic balancing test fixture for a double-sided end-tooth rotor, characterized in that, include: The first fixing member has a first mating tooth and a positioning hole; The second fixing member is disposed opposite to the first fixing member, the rotor is located between the first fixing member and the second fixing member, the second fixing member has a second mating tooth facing the first mating tooth, and the second fixing member has a through hole; A locking element passes through the through hole and the positioning hole to connect the first fixing element and the second fixing element; The first mating tooth can mesh with any two of the end teeth of the rotor and the second mating tooth.

2. The test fixture according to claim 1, characterized in that, The first fastener includes: A first connecting portion extends axially and is used to be mounted on a balancing machine; A first fixing part is connected to the first connecting part. The end face of the first fixing part away from the first connecting part is provided with a first mating tooth. The positioning hole is opened on the first fixing part along the axial direction.

3. The test fixture according to claim 2, characterized in that, The positioning hole is a blind hole.

4. The test fixture according to any one of claims 1 to 3, characterized in that, The second fastener includes: A second connecting part, which extends axially, is used to be mounted on a balancing machine; The second fixing part and the second connecting part are provided with a second mating tooth on the end face of the second fixing part away from the second connecting part, and the through hole is opened axially on the second connecting part and the second fixing part.

5. The test fixture according to any one of claims 1 to 3, characterized in that, The locking element includes: A locking screw, which passes through the through hole and the positioning hole; A locking nut is fixedly connected to the end of the locking screw away from the first fixing member, so as to fix the first fixing member and the second fixing member in place.

6. A dynamic balancing test method for a double-sided end-tooth rotor, characterized in that, This is achieved using the test fixture described in any one of claims 1 to 5.

7. The test method according to claim 6, characterized in that, The test fixture is subjected to dynamic balancing tests and corrections until the dynamic balancing parameters of the test fixture meet the preset balancing parameters. The rotor is mounted on the test fixture, and a multi-round dynamic balancing test is performed on the rotor. The balance state of the rotor is determined based on the results of multiple rounds of dynamic balancing tests.

8. The test method according to claim 7, characterized in that, The test method includes: The step of performing dynamic balancing tests and corrections on the test fixture until the dynamic balancing parameters of the test fixture meet the preset balancing parameters specifically includes: Assemble the first fastener, the second fastener, and the locking component to form a tooling assembly and record the alignment marks of the first fastener and the second fastener. The tooling assembly is installed on a balancing machine and a dynamic balancing test is performed to obtain the initial dynamic balancing parameters. The first and second fixing components are adjusted by counterweights according to the initial dynamic balance parameters until the dynamic balance parameters of the tooling assembly meet the preset balance parameters.

9. The test method according to claim 8, characterized in that, The step of mounting the rotor on the test fixture and performing a multi-round dynamic balancing test on the rotor specifically includes: The rotor is installed between the first fixing member and the second fixing member to form a first test assembly, wherein the first fixing member and the second fixing member are assembled according to the mating mark, and the rotor is in the initial position corresponding to the mating mark; A first dynamic balancing test was performed on the first test assembly, and the first imbalance of the rotor was recorded. The rotor is rotated from the initial position by a preset angle to the rotation position to form the second test assembly. A second round of dynamic balancing test was conducted on the second test assembly, and the second imbalance of the rotor was recorded. The corrected imbalance amount of the rotor is determined based on the first imbalance amount and the second imbalance amount; The counterweight of the second test assembly is corrected according to the corrected imbalance amount, and a third dynamic balancing test is performed to record the third imbalance amount of the rotor. The rotor is rotated in the opposite direction by a preset angle from the rotational position back to the initial position, forming the first test assembly. A fourth dynamic balancing test was conducted on the first test assembly, and the fourth unbalance of the rotor was recorded.

10. The test method according to claim 9, characterized in that, The step of determining the balance state of the rotor based on the results of multiple rounds of dynamic balancing tests specifically includes: When the difference between the fourth imbalance and the third imbalance meets the preset error range, the rotor is determined to be in a balanced state.

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