Control method and system for cold-state assembly clearance of centrifugal compressor and electronic equipment

Abstract

The invention relates to the technical field of assembly of medium and small air compressors, and particularly discloses a control method for a cold-state assembly clearance of a centrifugal compressor, which comprises the following steps: selecting a reference point of the cold-state assembly clearance; selecting a reference point which affects the cold-state assembly levelness of the cold-state assembly clearance; adjusting parts and the number of the adjusting parts used for the cold-state assembly clearance are selected; selecting a matching end surface for mounting the adjusting piece; the order of controlling the cold-state assembly gaps or the levelness between the reference points by adjusting the sizes of the adjusting pieces is selected; obtaining a correlation size; the size of the adjusting part is calculated according to the selected sequence according to the relevant size, the cold-state assembly clearance, the cold-state assembly levelness design threshold value requirement and the centrifugal compressor flow channel design layout requirement; and verifying whether the adjusting part can be installed or not. According to the method, accumulated errors in the design or manufacturing process can be controlled, the cold-state assembly clearance and the levelness of the adjusted centrifugal compressor can meet the requirements at the same time, and the adjusting efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the field of aviation, and in particular to a control method, system and electronic equipment for cold assembly clearance of a centrifugal compressor. Background Art

[0002] Small and medium-sized engine compressors, especially centrifugal compressors, are sensitive to tip clearance. However, actual processing is inevitably different from theoretical design, and the direction of deviation accumulation is difficult to predict. Different operating conditions (such as dust, ice and snow, and high altitudes) also have different threshold requirements for clearance. Therefore, a gap control method suitable for the application is one of the key technologies for small and medium-sized engine compressors to maintain stable batch performance of gaps, improve the adjustability and simplicity of gap scenarios, reduce design costs, and improve the efficiency of research and development standardization. The gap for cold assembly referred to in the present invention is the cold conversion gap under the hot state of the design condition.

[0003] See also Figure 1 In order to adjust the impeller cover gap, the independent adjustment pad gap H0 is adjusted. At this time, although the cold installation gap X1 between the centrifugal impeller cover and the centrifugal impeller reaches the design gap, the flushness of the impeller cover and the diffuser also changes, and even forms an inverted step.

[0004] See also Figure 2 In order to adjust the impeller cover gap, the impeller cover thickness H1 is adjusted. At this time, although the installation gap X1 between the impeller cover and the centrifugal impeller also reaches the designed gap, the flushness of the impeller cover and the diffuser also changes, and even forms an inverted step. In addition, due to the large change in the impeller cover size H1, the interchangeability requirements can no longer be met.

[0005] The existing clearance control methods for small and medium-sized compressors are difficult to ensure that the clearance and corresponding flushness meet the required values ​​at the same time; or in order to meet the adjustment, irreversible dimensional changes are caused to other main parts, making them lose interchangeability. Due to the isolated adjustment method, the controllability of the adjustment range is insufficient, the adjustment stability is poor, and even other main parts of the design need to be repaired. In addition, in order to control the accumulated error and achieve the clearance or concentricity control accuracy under the same conditions, this kind of traditional adjustment method often requires higher dimensional accuracy requirements for the main parts. Summary of the invention

[0006] The object of the present invention is to provide a control method for the cold assembly clearance of a centrifugal compressor, which can control the accumulated error so that the cold assembly clearance and flushness of the adjusted centrifugal compressor can meet the requirements at the same time and increase the adjustment efficiency.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A method for controlling cold assembly clearance of a centrifugal compressor, comprising:

[0009] Select the reference point of the cold assembly gap; Select the reference point of the cold assembly flushness that affects the cold assembly gap;

[0010] Select the adjustment parts and quantity for cold assembly clearance;

[0011] Select the mating end surface for adjusting piece installation;

[0012] Select the order in which the cold assembly gap or flushness between reference points is controlled by adjusting the size of the adjusting parts;

[0013] Obtaining the design layout requirements of the centrifugal compressor flow channel, the reference point clearance design threshold of the cold assembly clearance, the reference point flushness design threshold of the cold assembly flushness affecting the cold assembly clearance, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller;

[0014] The size of the adjusting part is calculated in a selected order according to the relationship between the gap design threshold between reference points of the cold assembly gap, the flushness design threshold between reference points that affects the cold assembly gap, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller and the size of the adjusting part;

[0015] After verifying the installation of the adjustment parts, whether the cold assembly clearance and cold assembly flatness meet the design threshold and whether they meet the centrifugal compressor flow path design layout requirements. If they meet both requirements, the control is successful. If not, the above selection is repeated until the verification is satisfied.

[0016] In a further embodiment, the method for selecting a reference point of the cold assembly gap includes:

[0017] The point with the largest thermal deformation on the centrifugal impeller blade of the centrifugal compressor and the axial alignment point on the centrifugal impeller cover are selected as the reference points for the cold assembly clearance.

[0018] In a further embodiment, the method for selecting a reference point that affects the cold assembly flushness of the cold assembly gap includes:

[0019] The point with the largest thermal deformation on the centrifugal impeller blade of the centrifugal compressor and the corresponding point on the flow channel surface of the diffuser cover plate are selected as reference points for the cold assembly gap.

[0020] In a further embodiment, the method for obtaining the design layout requirements of the centrifugal compressor flow passage, obtaining the clearance design threshold between reference points of the cold assembly clearance, the flushness design threshold between reference points affecting the cold assembly clearance, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller all include:

[0021] Obtained from relevant design data of the centrifugal compressor.

[0022] In a further embodiment, the method for selecting the number of adjustment members for the cold assembly gap includes:

[0023] Obtain the force transmission path and amount of the centrifugal compressor loading load that affects the cold assembly clearance and flushness at the reference point;

[0024] Select the same number and amount of adjustment parts as the cold assembly clearance and flushness of the reference point;

[0025] Select an adjustment element that has one less force transmission path than the number of force transmission paths.

[0026] In a further embodiment, the method for obtaining the force transmission path and quantity of the centrifugal compressor loading load affecting the cold assembly clearance and flushness at the reference point includes:

[0027] Obtained from relevant design data of the centrifugal compressor.

[0028] In a further embodiment, the method for selecting a mating end surface for installing the adjusting member includes:

[0029] Obtaining a matching end face that is located on the force transmission path and meets the requirements of the centrifugal compressor flow channel design layout before the adjustment member is installed without damaging the adjustment member after the adjustment member is installed on the end face, and selecting a matching end face for installing the adjustment member in the order of the inner ring diameter of the end face from small to large;

[0030] Then, from the remaining mating end faces that meet the requirements of the centrifugal compressor flow path design layout before installing the adjusting parts after the end face is installed without destroying the adjusting parts, select the end faces for installing the adjusting parts in order from small to large inner ring diameters, until the number of selected mating end faces is equal to the number of adjusting parts.

[0031] In a further embodiment, the method of selecting the order of controlling the cold assembly gap or flushness between reference points by adjusting the size of the adjusting member comprises:

[0032] A sequence for determining the sizes of adjusting parts is preset. If the control of the cold assembly gap or flushness between previous reference points is not affected when adjusting the size of an adjusting part, then the sequence for determining the sizes of adjusting parts is selected; if not satisfied, the preset is continued until the sequence for determining the sizes of adjusting parts is selected.

[0033] Another aspect of the present invention further provides a control system for cold assembly clearance of a centrifugal compressor, comprising:

[0034] A selection module is used to select reference points for the cold assembly gap; select reference points for the cold assembly flushness that affect the cold assembly gap; select adjustment parts and their quantity for the cold assembly gap; select mating end faces for installation of adjustment parts; and select the order for controlling the cold assembly gap or flushness between reference points by adjusting the size of the adjustment parts;

[0035] An acquisition module, used to acquire the design layout requirements of the centrifugal compressor flow channel, the gap design threshold between reference points of the cold assembly gap, the flushness design threshold between reference points that affects the cold assembly gap, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller;

[0036] A calculation module, for calculating the size of the adjusting member according to a gap design threshold between reference points of the cold assembly gap, a flushness design threshold between reference points that affects the cold assembly gap, a size between matching end faces, a size between matching end faces and reference points, and a correlation relationship between the size between reference points on the centrifugal impeller and the size of the adjusting member;

[0037] The verification module is used to verify whether the clearance between reference points of the cold assembly clearance and the flushness between reference points of the cold assembly flushness after the adjustment parts are installed meet the design threshold and meet the requirements of the centrifugal compressor flow path design layout. If so, the control is successful. If not, the selection is performed again through the above-mentioned selection module until the verification is satisfied.

[0038] Another aspect of the present invention provides an electronic device, comprising: a memory for storing a computer program; and a processor for implementing a control method for cold assembly clearance of a centrifugal compressor as described in any one of claims 1 to 8 when executing the computer program.

[0039] Beneficial effects of the present invention:

[0040] The present invention is based on a method for setting an adjustment part to control the cold assembly gap of a centrifugal compressor, and its setting method has certain systematicity and linkage. Its structure is independent of the design of the main parts (centrifugal impeller, impeller cover, diffuser, etc.), and the dependence on the design of the main parts is reduced, thereby reducing the increase in the requirements for the dimensional accuracy of the main parts due to the gap control, thereby reducing the machining process cost and the complexity of the machining process of the main parts. On the other hand, the method of controlling the cold assembly gap of the present invention can quickly obtain the size of the adjustment part and a reasonable adjustment sequence, improve the adjustment efficiency, and the adjustment sequence can control the accumulated error through system linkage adjustment, so that the cold assembly gap and flushness of the centrifugal compressor after adjustment can meet the requirements at the same time, and can maintain the stability of the cold assembly gap adjustment after adjustment, improve the on-site adjustability of the use environment, improve the simplicity of local adjustment, reduce the consumption of adjustment resources, and improve the adjustment efficiency.

[0041] The overall method is applicable to many scenarios and can obtain a more reasonable cold assembly clearance of centrifugal compressors and their derivatives in the design simulation stage (before process assembly). It shortens the development and batch production cycle, saves manpower and material costs, and alleviates or avoids the scraping and wear damage caused by poor control of cold assembly clearance of small and medium-sized engines or compressors. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 It is a partial schematic diagram of the centrifugal compressor installation independent adjustment pad in the related art;

[0044] Figure 2 It is a partial schematic diagram of a centrifugal compressor using an impeller cover with increased thickness in the related art;

[0045] Figure 3 is a schematic structural diagram of a two-stage centrifugal compressor in an embodiment of the present invention;

[0046] Figure 4 is a schematic diagram of a force transmission path 1 of a two-stage centrifugal compressor in an embodiment of the present invention;

[0047] Figure 5 is a schematic diagram of a second force transmission path of a two-stage centrifugal compressor in an embodiment of the present invention;

[0048] Figure 6 Schematic diagram of the position of the installation adjustment parts of the two-stage centrifugal compressor in the embodiment of the present invention;

[0049] Figure 7 is a correlation diagram of the dimension T1 in the embodiment of the present invention;

[0050] Figure 8 is a correlation diagram of the dimension T2 in the embodiment of the present invention;

[0051] Fig. 9 is a correlation diagram of the dimension T3 in the embodiment of the present invention;

[0052] Fig.10 is a correlation diagram of the dimension T4 in the embodiment of the present invention;

[0053] Fig.11 is a correlation diagram of the dimension T5 in the embodiment of the present invention;

[0054] Fig.12 The present invention is a flowchart of a method for controlling cold assembly clearance of a centrifugal compressor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] Embodiment 1, as Fig.12 As shown, a method for controlling the cold assembly clearance of a centrifugal compressor comprises:

[0057] S100: Selecting a reference point of the cold assembly gap; selecting a reference point of the cold assembly flushness that affects the cold assembly gap;

[0058] S200: Selecting the adjustment parts and quantity for cold assembly gap;

[0059] S300: Select the mating end face for installing the adjusting member;

[0060] S400: Selecting a sequence for controlling the cold assembly gap or flushness between reference points by adjusting the size of the adjusting member;

[0061] S500: Obtaining the design layout requirements of the centrifugal compressor flow channel, the gap design threshold between reference points of the cold assembly gap, the design threshold between reference points of the cold assembly flatness that affects the cold assembly gap, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller;

[0062] S600: Calculate the size of the adjusting member according to the gap design threshold between reference points of the cold assembly gap, the flushness design threshold between reference points that affects the cold assembly gap, the size between the mating end faces, the size between the mating end faces and the reference points, and the relationship between the size between the reference points on the centrifugal impeller and the size of the adjusting member;

[0063] In some embodiments, the size of the adjustment auxiliary parts needs to be repaired according to the preliminary results of the adjustment range, based on the process feasibility and rationality, such as adjusting the size of the adjustment parts that are smaller than the minimum processable size to above the minimum processable size, and fine-tuning the design of the main parts when necessary. This can ensure that the calculated size of the adjustment parts can be processed by existing processing equipment or reduce the processing cost. If the processing accuracy of existing processing equipment or future processing equipment can process the size of the adjustment parts, this step can be ignored, or it can be ignored in the design stage.

[0064] S700: After verifying the installation of the adjustment parts, whether the clearance between the reference points of the cold assembly clearance and the flushness between the reference points of the cold assembly flushness meet the design threshold and whether they meet the centrifugal compressor flow path design layout requirements. If they meet the requirements at the same time, the control is successful. If they do not meet the requirements at the same time, reselect until the verification is satisfied.

[0065] In some embodiments, in order to make the verification pass quickly, the input data that matches the deviation direction can be reselected based on the deviation of the last calculated data. This can speed up the verification. For example, in the last calculation, it was found that the adjusting part was too thin, which caused processing difficulties or resulted in the failure to meet the clearance between reference points of the cold assembly clearance and the flushness between reference points of the cold assembly flushness to meet the design threshold and the requirements of the centrifugal compressor flow path design layout. In this case, the data within the adjustment pad range close to the machinable range is reselected based on the calculated result data for verification. Some methods to speed up data selection to a reasonable range can be used to speed up data selection efficiency.

[0066] In some embodiments, the reference point can be selected as the position point of the compressor centrifugal impeller with a given circumferential diameter and the relative position point of the impeller cover for clearance reference; the position points of the compressor centrifugal impeller and the diffuser with a given circumferential diameter are selected as reference points for their flatness reference. The point with the largest thermal deformation on the centrifugal compressor centrifugal impeller blade and the axial alignment point on the centrifugal impeller cover are preferably selected as reference points for the cold assembly clearance. The point with the largest thermal deformation on the centrifugal compressor centrifugal impeller blade and the corresponding point on the diffuser cover flow channel surface are selected as reference points for the cold assembly clearance.

[0067] See also Figure 3 The figure shows a two-stage centrifugal compressor to be adjusted, and the point with the largest thermal deformation on the blade of the first-stage centrifugal impeller is selected;

[0068] Select the axial alignment point on the first-stage centrifugal impeller cover with the point on the first-stage centrifugal impeller blade with the largest thermal deformation;

[0069] The point with the largest thermal deformation on the first-stage centrifugal impeller blade and the point on the first-stage centrifugal impeller cover that is axially aligned with the point with the largest thermal deformation on the first-stage centrifugal impeller blade are used as reference points for controlling the cold assembly gap between the first-stage centrifugal impeller and the first-stage centrifugal impeller cover, see Figure 3 As shown, it is the corresponding point between the cross section D1 and the boundary of the gap.

[0070] Select the point with the largest thermal deformation on the blade of the second-stage centrifugal impeller;

[0071] Select the axial alignment point on the second-stage centrifugal impeller cover with the point on the second-stage centrifugal impeller blade with the largest thermal deformation;

[0072] The point with the largest thermal deformation on the second-stage centrifugal impeller blade and the point on the second-stage centrifugal impeller cover that is axially aligned with the point with the largest thermal deformation on the second-stage centrifugal impeller blade are used as reference points for controlling the cold assembly gap between the second-stage centrifugal impeller and the second-stage centrifugal impeller cover. Figure 3 Shown are the corresponding points of the cross section D2 and the boundary of the gap.

[0073] Select a point on the first stage diffuser cover flow path surface; see Figure 3 The intersection point of the first-stage diffuser cover plate flow channel surface and the first-stage diffuser impeller is shown and is in the same section as the above-mentioned reference point.

[0074] The point with the largest thermal deformation on the blade of the first-stage centrifugal impeller and the point on the flow passage surface of the first-stage diffuser cover plate are selected as reference points for controlling the cold assembly flushness between the first-stage centrifugal impeller and the first-stage diffuser;

[0075] Select a point on the second stage diffuser cover flow path surface; see Figure 3 The intersection point between the second-stage diffuser cover plate flow path surface and the second-stage diffuser impeller is shown and is in the same section as the above-mentioned reference point.

[0076] The point with the largest thermal deformation on the blade of the second-stage centrifugal impeller and the point on the flow path surface of the second-stage diffuser cover plate are selected as reference points for controlling the cold assembly flushness between the second-stage centrifugal impeller and the second-stage diffuser.

[0077] Select the relative points of gap and flushness between the above reference points to ensure that the cold assembly gap and flushness measurement calculation basis selection is consistent with the design basis.

[0078] It is convenient for calculation conversion of different adjustment sequence methods, easy to simplify calculation, and analyze the adjustment mechanism. For example, if the cold assembly clearance between the first-stage centrifugal impeller and the first-stage centrifugal impeller cover, the cold assembly clearance between the second-stage centrifugal impeller and the second-stage centrifugal impeller cover, the cold assembly levelness of the first-stage centrifugal impeller cover and the first-stage diffuser, and the cold assembly levelness of the second-stage centrifugal impeller cover and the second-stage diffuser are taken as the adjustment targets, according to their inherent relationship, the cold assembly levelness of the first-stage centrifugal impeller cover and the first-stage diffuser is equal to the sum of the cold assembly levelness of the first-stage centrifugal impeller and the first-stage diffuser and the cold assembly clearance between the first-stage centrifugal impeller and the first-stage centrifugal impeller cover, and the cold assembly levelness of the second-stage centrifugal impeller cover and the second-stage diffuser is equal to the sum of the cold assembly levelness of the second-stage centrifugal impeller and the second-stage diffuser and the cold assembly clearance between the second-stage centrifugal impeller and the second-stage centrifugal impeller cover, it can be converted into the original adjustment method design calculation or reverse calculation.

[0079] It can be imagined that different adjustment sequences can be applied depending on the selected target adjustment gap nominal scalar, but the joint formula determined by each adjustment sequence should have consistent results. However, selecting the above-mentioned predetermined position reference point will speed up the subsequent calculation efficiency and complete the control of the cold assembly gap of the centrifugal compressor more quickly than selecting other position reference points.

[0080] In some embodiments, a method for selecting an adjustment member and number for a cold assembly clearance includes obtaining a force transmission path and number n of a centrifugal compressor loading load that affects a cold assembly clearance and flushness at a reference point;

[0081] Select the adjustment parts with the same number and degree of cold assembly clearance and flushness as the reference point as the main adjustment parts;

[0082] Select n-1 adjusting parts as compensating adjusting parts.

[0083] The method for obtaining the force transmission path and quantity of the centrifugal compressor loading load that affects the cold assembly gap and flushness at the reference point includes: obtaining from the relevant design data of the centrifugal compressor, that is, obtaining the force transmission path from the specific structural layout of the centrifugal compressor, that is, the functional structure and relative position relationship of each component.

[0084] See also Figure 3 A two-stage centrifugal compressor to be adjusted is shown. Through the compressor design layout parameters, it can be known that the number of centrifugal impellers of the centrifugal compressor is 2, and the number of cold assembly gaps of the centrifugal compressor that need to be adjusted is two; the number of flushness affecting the cold assembly gap of the reference point is two.

[0085] Through force analysis and other methods, it can be known that the force transmission path of the centrifugal compressor loading load that affects the cold assembly clearance and flushness at the reference point is as follows: Figure 4The load generated by the centrifugal impeller of the centrifugal compressor shown in the figure passes through the inlet casing, the intermediate casing and the second-stage diffuser. Figure 5 The load generated by the centrifugal impeller of the centrifugal compressor shown in the figure passes through the force transmission path 2 of the air inlet casing, the first-stage diffuser and the returner, and the second-stage diffuser. The number of force transmission paths is 2, so the total number of adjustment parts is 5, including 4 main adjustment parts equal to the number of cold assembly clearances and flushness of the centrifugal compressor and a compensation adjustment part equal to 1 less than the number of force transmission paths 2.

[0086] It is conceivable that if the number of adjustment parts of a centrifugal compressor with a lower number of stages needs to be adjusted during the design model stage, it can also be tried with a preset number such as a calculator, and finally the selection result can be obtained by reverse verification through experimental results. However, it is obvious that this selection method has many possibilities, large amount of calculation, slow results, and is not suitable for use in physical processing and assembly control. However, this method should also be within the scope of publication or protection of this application.

[0087] The adjustment parts of the second-stage centrifugal compressor can be selected from adjusting gaskets.

[0088] In some embodiments, the method of selecting a mating end surface for installing an adjustment member includes:

[0089] Obtaining a matching end face that is located on the force transmission path and meets the requirements of the centrifugal compressor flow channel design layout before the adjustment member is installed without damaging the adjustment member after the adjustment member is installed on the end face, and selecting a matching end face for installing the adjustment member in the order of the inner ring diameter of the end face from small to large;

[0090] Then, from the remaining mating end faces that meet the requirements of the centrifugal compressor flow path design layout before installing the adjusting parts after the end face is installed without destroying the adjusting parts, select the end faces for installing the adjusting parts in order from small to large inner ring diameters, until the number of selected mating end faces is equal to the number of adjusting parts.

[0091] In this way, the requirement that the original flow channel design layout of the centrifugal compressor is not destroyed after the end face mounting adjustment member is used is met, so that the smallest possible end face diameter that meets the above conditions can be selected in the diameter selection area.

[0092] See also Figure 6The two-stage centrifugal compressor to be adjusted is shown, and the matching end face of the air intake casing and the first-stage centrifugal impeller located on the force transmission path is selected to install the adjustment part; the matching end face of the intermediate casing and the first-stage diffuser located on the force transmission path is selected to install the adjustment part; the matching end face of the second-stage centrifugal diffuser and the returner located on the force transmission path is selected to install the adjustment part; the above-mentioned end face diameters are selected from small to large in sequence, and the design layout requirements of the flow path of the two-stage centrifugal compressor before the installation of the adjustment part are not destroyed after the adjustment part is installed. After the selection, when there is no matching end face located on the force transmission path, the matching end face of the air intake casing and the first-stage centrifugal impeller cover is selected to install the adjustment part; the matching end face of the second-stage centrifugal impeller cover and the returner is selected to install the adjustment part, and the matching end face diameters selected are successively increased, and the design layout requirements of the flow path of the centrifugal compressor before the installation of the adjustment part are not destroyed after the adjustment part is installed. Similarly, those skilled in the art can also use experimental methods to obtain results, but it is obvious that this selection method has many possibilities, large calculation amount, slow results, and is not suitable for use in physical processing and assembly control. However, this method should also be within the scope of publication or protection of this application.

[0093] In some embodiments, a method of selecting a sequence for controlling a cold assembly gap or flushness between reference points by adjusting the size of an adjustment member comprises:

[0094] A sequence of controlling the cold assembly gap or flushness between reference points by adjusting the size of the adjusting parts is preset. If the adjustment of one adjusting part size does not affect the control of the cold assembly gap or flushness between the previous reference points, the sequence of controlling the cold assembly gap or flushness between reference points by adjusting the size of the adjusting parts is selected; if not, the preset is continued until the sequence of controlling the cold assembly gap or flushness between reference points by adjusting the size of the adjusting parts is selected. In this way, the interdependence of the adjustment sizes is adjusted to ensure the relative independence of the sizes of the adjusting parts during adjustment.

[0095] For example, if a two-stage centrifugal compressor is to be adjusted, a sequence is pre-set for controlling the cold assembly gap or flushness between reference points by adjusting the size of the adjustment parts:

[0096] S1: See Figure 7 As shown, by adjusting the size T1 of the component, the cold assembly flushness J2 of the second-stage impeller and the second-stage diffuser is controlled;

[0097] S2: See Figure 8 As shown, by adjusting the size T2 of the component, the cold assembly flushness J1 of the first-stage impeller and the first-stage diffuser is controlled, but the control of the cold assembly flushness J2 of the second-stage impeller and the second-stage diffuser in step S1 is not affected;

[0098] S3: See Fig. 9As shown, by adjusting the size T3 of the component, the cold assembly clearance X1 between the first-stage impeller and the first-stage centrifugal impeller cover is controlled, but the control of the second-stage impeller in step S1 and the cold assembly flushness J2 of the second-stage diffuser and the control of the cold assembly flushness J1 of the first-stage impeller and the first-stage diffuser in step S2 are not affected;

[0099] S4: See Fig.10 As shown, by adjusting the size T4 of the component, the cold assembly clearance X2 of the second-stage impeller and the second-stage centrifugal impeller cover is controlled, but the control of the cold assembly flushness J2 of the second-stage impeller and the second-stage diffuser in step S1, the control of the cold assembly flushness J1 of the first-stage impeller and the first-stage diffuser in step S2, and the control of the cold assembly clearance X1 of the first-stage impeller and the first-stage centrifugal impeller cover are not affected;

[0100] S5: See Fig.11 As shown, by adjusting the size T5 of the adjusting component, the accumulated error of the adjusting force transmission path is compensated, but it does not affect the control of the cold assembly flushness J2 of the second-stage impeller and the second-stage diffuser in step S1, the control of the cold assembly flushness J1 of the first-stage impeller and the first-stage diffuser in step S2, the control of the cold assembly gap X1 of the first-stage impeller and the first-stage centrifugal impeller cover in step S3, and the cold assembly gap X2 of the second-stage impeller and the second-stage centrifugal impeller cover in step S4.

[0101] A person skilled in the art should be able to conceive that the adjusting part installed to compensate for the cumulative error of the adjusting force transmission path can be directly placed on the last adjusting part size T5. In this way, a sequence of controlling the cold assembly gap or flushness between reference points by adjusting the adjusting part size can be obtained. The obtained sequence makes it possible to quickly obtain the size of the adjusting part.

[0102] In some embodiments, the method of obtaining the design layout requirements of the centrifugal compressor flow passage, obtaining the clearance design threshold between reference points of the cold assembly clearance, the flushness design threshold between reference points that affects the cold assembly clearance, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller all include:

[0103] Acquired from the relevant design data of the centrifugal compressor. The acquisition method can be obtained from the design model of the centrifugal compressor to be adjusted. The centrifugal compressor flow path design layout requirements include that the centrifugal compressor flow path shape meets the data requirements such as gas flow rate and efficiency; the dimensions used for acquisition should contain as little or no dimensions of the adjustment parts that are not currently calculated as possible, and the dimensions included in the dimension chain formed by the acquired dimensions should be as few as possible to reduce the cumulative error.

[0104] For example, if a two-stage centrifugal compressor is to be adjusted, the dimension L1 between the mating end surface of the first-stage centrifugal impeller and the air inlet casing and the reference point on the second-stage centrifugal impeller is obtained from the centrifugal compressor to be adjusted by measurement or direct data capture; the dimension L2 between the mating end surface of the air inlet casing and the first-stage centrifugal impeller and the mating end surface of the air inlet casing and the intermediate casing is obtained; the dimension L3 between the mating end surface of the intermediate casing and the air inlet casing and the mating end surface of the intermediate casing and the second-stage diffuser is obtained; the dimension L4 between the mating end surface of the second-stage diffuser and the intermediate casing and the reference point of the second-stage diffuser is obtained; the dimension L5 between the mating end surface of the first-stage centrifugal impeller and the air inlet casing and the reference point of the first-stage centrifugal impeller is obtained; the dimension L6 between a point on the flow passage surface of the first-stage diffuser cover and the mating end surface of the first-stage diffuser and the returner is obtained; the dimension L7 between the mating end surface of the returner and the first-stage diffuser and the mating end surface between the returner and the second-stage diffuser is obtained; The dimension L8 between the mating end faces of the diffuser and the return flow device and the mating end faces of the second-stage diffuser and the intermediate casing; obtain the dimension L9 between the mating end faces of the first-stage centrifugal impeller cover and the air intake casing and the reference point on the first-stage centrifugal impeller cover; obtain the dimension L10 between the mating end faces of the second-stage centrifugal impeller cover and the return flow device; obtain the dimension L11 between the mounting surface of the return flow device and the second-stage diffuser and the mating end faces of the second-stage centrifugal impeller cover and the return flow device; obtain the dimension L12 between the reference points on the first-stage centrifugal impeller and the second-stage centrifugal impeller; the dimension L13 between the mounting mating end faces of the intermediate casing and the air intake casing and the mating end faces of the intermediate casing and the first-stage diffuser; obtain the dimension L14 between the mating end faces of the first-stage diffuser and the intermediate casing and the mating end faces of the first-stage diffuser and the return flow device; obtain the dimension L15 between the mating end faces of the air intake casing and the first-stage centrifugal impeller and the mating end faces of the air intake casing and the first-stage centrifugal impeller cover. From the design parameters of the centrifugal compressor to be adjusted, a cold assembly clearance design threshold X1 between the reference points of the first-stage centrifugal impeller and the first-stage centrifugal impeller cover and a cold assembly clearance design threshold X2 between the reference points of the second-stage centrifugal impeller and the second-stage centrifugal impeller cover are obtained; a cold assembly flushness design threshold J1 between the reference points of the first-stage centrifugal impeller and the first-stage diffuser, and a cold assembly flushness design threshold J2 between the reference points of the second-stage centrifugal impeller and the second-stage diffuser, which affect the cold assembly clearance;

[0105] According to the gap design threshold between reference points of the cold assembly gap of the second-stage centrifugal compressor to be adjusted, the design threshold between reference points of the cold assembly flushness that affects the cold assembly gap, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller and the size of the adjusting part, the size of the adjusting part is calculated in the order selected above.

[0106] S1. See Figure 7As shown, the range of T1 is determined by the calculation formula: T1 = L2 + L3 + L4 - L1 - J2;

[0107] S2. See Figure 8 As shown, the range of T2 is determined by the calculation formula: T2 = L2 + L3 - T1 - L5 - J1 - L6 - L7 - L8;

[0108] S3. See Fig. 9 As shown, the range of T3 is determined by the calculation formula: T3 = T1 + L5 - L15 - L9 - X1;

[0109] S4. See Fig.10 As shown, the range of T4 is determined by the calculation formula: T4 = L12-J1-L6-L7-L11-L10-X2;

[0110] S5. See Fig.11 As shown, the range of T5 is determined by the calculation formula: T5 = L1 + T1 + J2 - L2 - L13 - L14 - L7 - T2 - L8;

[0111] Specific:

[0112] X1=0.717mm; X2=0.727mm; J1=2.115mm; J2=0.369mm;

[0113] T1=0.661~2.082mm(T1=L2+L3+L4-L1-J2);

[0114] T2=1.592~2.672mm(T2=L2+L3-T1-L5-J1-L6-L7-L8);

[0115] T3=1.916~2.896mm(T3=T1+L5-L15-L9-X1);

[0116] T4=1.671~2.951mm(T4=L12-J1-L6-L7-L11-L10-X2);

[0117] T5=1.578~3.158mm (T5=L1+T1+J2-L2-L13-L14-L7-T2-L8); the remaining dimensions are obtained by measurement or directly from the design data, but due to confidentiality, they are not published here one by one.

[0118] The preliminary calculation results show that, except for T1 = 0.661 ~ 2.082 mm, the adjustment pad may be too thin, difficult to process or the processing cost is too high. The T1 size is repaired to 1 ~ 2.421 mm.

[0119] By making the adjustment parts of the above-mentioned size and adjusting them in the adjustment order confirmed above, verify whether the cold assembly clearance and cold assembly flushness meet the design threshold and the requirements of the centrifugal compressor flow path design layout after the adjustment parts are installed on the second-stage centrifugal compressor to be adjusted. If they meet at the same time, the control is successful. If they do not meet at the same time, reselect until the verification is satisfied. At this time, other position points can be selected to verify the cold assembly clearance and cold assembly flushness, and whether the requirements of the centrifugal compressor flow path design layout are met can be determined according to the design requirements.

[0120] The control method of the present invention is also suitable for small and medium-sized engine compressor configurations with sudden changes in radial dimensions of the front and rear flow passages such as oblique flow centrifugal and double oblique flow, and high requirements for cold assembly clearance and flushness. It can be used to quickly obtain the cold assembly clearance of centrifugal compressors that meet the design threshold in the design stage, modification stage, manufacturing stage, and maintenance stage.

[0121] The subject of the above-mentioned execution of the action can be a person or a machine such as a computer, robot, etc. Selection of design basis for adjustment system for cold assembly clearance of compressor; confirmation of clearance adjustment number for adjustment system for cold assembly clearance of compressor; selection of adjustment section and radial dimension confirmation method for cold assembly clearance of compressor; confirmation principle and method for adjustment sequence for cold assembly clearance of compressor; calculation, repair principle and adjustment method for adjustment range of cold assembly clearance of compressor.

[0122] The cold assembly gap control method involved in the present invention is a control method based on a series of adjustment parts, which has certain systematicity and linkage. Its structure is independent of the design of the main parts (centrifugal impeller, impeller cover, diffuser, etc.), and the dependence on the design of the main parts is reduced, thereby reducing the increase in the requirements for the dimensional accuracy of the main parts due to the gap control, thereby reducing the machining process cost and the complexity of the machining process of the main parts. On the other hand, the cold assembly gap control method using system linkage adjustment can maintain and improve the stability of the cold assembly gap adjustment, improve the on-site adjustability of the use environment, improve the simplicity of local adjustment, reduce the consumption of adjustment resources, and improve the adjustment efficiency.

[0123] Previously, there was no systematic cold assembly gap adjustment control method in China, which made it difficult to ensure that the gap and corresponding flushness reached the required values ​​at the same time; or in order to meet the adjustment, the main parts were irreversibly changed in size, making them lose their interchangeability. The method of the present invention is easy to digitize and intelligentize, further accelerating the adjustment efficiency.

[0124] Embodiment 2: This embodiment provides a control system for cold assembly clearance of a centrifugal compressor, comprising:

[0125] A selection module is used to select reference points for the cold assembly gap; select reference points for the cold assembly flushness that affect the cold assembly gap; select adjustment parts and their quantity for the cold assembly gap; select mating end faces for installation of adjustment parts; and select the order for controlling the cold assembly gap or flushness between reference points by adjusting the size of the adjustment parts;

[0126] An acquisition module, used to acquire the design layout requirements of the centrifugal compressor flow channel, the gap design threshold between reference points of the cold assembly gap, the flushness design threshold between reference points that affects the cold assembly gap, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller;

[0127] A calculation module, for calculating the size of the adjusting member according to a gap design threshold between reference points of the cold assembly gap, a flushness design threshold between reference points that affects the cold assembly gap, a size between matching end faces, a size between matching end faces and reference points, and a correlation relationship between the size between reference points on the centrifugal impeller and the size of the adjusting member;

[0128] The verification module is used to verify whether the clearance between reference points of the cold assembly clearance and the flushness between reference points of the cold assembly flushness after the adjustment parts are installed meet the design threshold and meet the requirements of the centrifugal compressor flow channel design layout. If so, the control is successful; if not, reselection is performed until the verification is satisfied.

[0129] Embodiment 3, this embodiment provides an electronic device, comprising: a memory for storing a computer program; a processor for implementing a control method for a cold assembly clearance of a centrifugal compressor according to the above embodiment when executing the computer program.

[0130] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0131] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for controlling the cold assembly clearance of a centrifugal compressor, characterized in that: The method comprises: Select the reference point of the cold assembly gap; Select the reference point of the cold assembly flushness that affects the cold assembly gap; Select the adjustment parts and quantity for cold assembly clearance; Select the mating end face for adjusting piece installation; Select the order in which the cold assembly gap or flushness between reference points is controlled by adjusting the size of the adjusting parts; Obtaining the design layout requirements of the centrifugal compressor flow channel, the reference point clearance design threshold of the cold assembly clearance, the reference point flushness design threshold of the cold assembly flushness affecting the cold assembly clearance, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller; The size of the adjusting part is calculated in a selected order according to the relationship between the gap design threshold between reference points of the cold assembly gap, the flushness design threshold between reference points that affects the cold assembly gap, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller and the size of the adjusting part; After verifying the installation of the adjustment parts, whether the cold assembly clearance and cold assembly flatness meet the design threshold and whether they meet the centrifugal compressor flow path design layout requirements. If they meet both requirements, the control is successful. If not, the above selection is repeated until the verification is satisfied.

2. A method for controlling cold assembly clearance of a centrifugal compressor according to claim 1, characterized in that: The method for selecting a reference point of a cold assembly gap comprises: The point with the largest thermal deformation on the centrifugal impeller blade of the centrifugal compressor and the axial alignment point on the centrifugal impeller cover are selected as the reference points for the cold assembly clearance.

3. A method for controlling cold assembly clearance of a centrifugal compressor according to claim 2, characterized in that: The method for selecting a reference point that affects the cold assembly flushness of the cold assembly gap comprises: The point with the largest thermal deformation on the centrifugal impeller blade of the centrifugal compressor and the corresponding point on the flow channel surface of the diffuser cover plate are selected as reference points for the cold assembly gap.

4. The method for controlling the cold assembly clearance of a centrifugal compressor according to claim 1, characterized in that: The method for obtaining the design layout requirements of the centrifugal compressor flow channel, obtaining the clearance design threshold between reference points of the cold assembly clearance, the flushness design threshold between reference points affecting the cold assembly clearance, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller all include: Obtained from relevant design data of the centrifugal compressor.

5. The method for controlling the cold assembly clearance of a centrifugal compressor according to claim 1, characterized in that: The method for selecting the number of adjusting members for cold assembly gap comprises: Obtain the force transmission path and amount of the centrifugal compressor loading load that affects the cold assembly clearance and flushness at the reference point; Select the same number and amount of adjustment parts as the cold assembly clearance and flushness of the reference point; Select an adjustment element that has one less force transmission path than the number of force transmission paths.

6. A method for controlling cold assembly clearance of a centrifugal compressor according to claim 5, characterized in that: The method for obtaining the force transmission path and quantity of the centrifugal compressor loading load affecting the cold assembly clearance and flushness at the reference point includes: Obtained from relevant design data of the centrifugal compressor.

7. A method for controlling cold assembly clearance of a centrifugal compressor according to claim 1, characterized in that: The method for selecting a mating end face for installing an adjusting member comprises: Obtaining a matching end face that is located on the force transmission path and meets the requirements of the centrifugal compressor flow channel design layout before the adjustment member is installed without damaging the adjustment member after the adjustment member is installed on the end face, and selecting a matching end face for installing the adjustment member in the order of the inner ring diameter of the end face from small to large; Then, from the remaining mating end faces that meet the requirements of the centrifugal compressor flow path design layout before installing the adjusting parts after the end face is installed without destroying the adjusting parts, select the end faces for installing the adjusting parts in order from small to large inner ring diameters, until the number of selected mating end faces is equal to the number of adjusting parts.

8. The method for controlling the cold assembly clearance of a centrifugal compressor according to claim 1, characterized in that: The method of selecting the order of controlling the cold assembly gap or flushness between reference points by adjusting the size of the adjusting member comprises: A sequence for determining the sizes of adjusting parts is preset. If the control of the cold assembly gap or flushness between previous reference points is not affected when adjusting the size of an adjusting part, then the sequence for determining the sizes of adjusting parts is selected; if not satisfied, the preset is continued until the sequence for determining the sizes of adjusting parts is selected.

9. A control system for cold assembly clearance of a centrifugal compressor, characterized in that: include: A selection module is used to select reference points for the cold assembly gap; select reference points for the cold assembly flushness that affect the cold assembly gap; select adjustment parts and their quantity for the cold assembly gap; select mating end faces for installation of adjustment parts; and select the order for controlling the cold assembly gap or flushness between reference points by adjusting the size of the adjustment parts; An acquisition module, used to acquire the design layout requirements of the centrifugal compressor flow channel, the gap design threshold between reference points of the cold assembly gap, the flushness design threshold between reference points that affects the cold assembly gap, the size between the mating end faces, the size between the mating end faces and the reference points, and the size between the reference points on the centrifugal impeller; A calculation module, for calculating the size of the adjusting member according to a gap design threshold between reference points of the cold assembly gap, a flushness design threshold between reference points that affects the cold assembly gap, a size between matching end faces, a size between matching end faces and reference points, and a correlation relationship between the size between reference points on the centrifugal impeller and the size of the adjusting member; The verification module is used to verify whether the clearance between reference points of the cold assembly clearance and the flushness between reference points of the cold assembly flushness after the adjustment parts are installed meet the design threshold and meet the requirements of the centrifugal compressor flow path design layout. If so, the control is successful. If not, the selection is performed again through the above-mentioned selection module until the verification is satisfied.

10. An electronic device, characterized in that: include: Memory for storing computer programs; A processor, configured to implement a method for controlling cold assembly clearance of a centrifugal compressor as claimed in any one of claims 1 to 8 when executing the computer program.

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