Gap determination method, air compressor, engine and vehicle

Abstract

The invention discloses a gap determining method, an air compressor, an engine and a vehicle, the gap determining method is used for determining a gap between a pressing shell and an impeller of the air compressor, and the gap determining method comprises the steps that a cutting coating is arranged on the side wall face, facing the impeller, of the pressing shell, and the cutting coating interferes with the impeller; driving the impeller to operate, and cutting the cutting coating by the impeller to form a cutting surface on the cutting coating; and after the impeller stops rotating, a gap between the cutting face and the impeller is obtained, and the gap is output as an impeller shell gap. Therefore, when the air compressor is designed, the ideal wheel shell gap can be directly obtained by measuring the gap between the cutting surface and the impeller. Compared with the prior art, the step of determining the ideal wheel shell gap is simplified, and the method is simpler and faster. And moreover, the accurate ideal wheel shell gap can be directly obtained, so that multiple times of mold opening for the pressing shell during research and development or design of the air compressor is not needed, and the cost for designing or researching and developing the air compressor is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air compressors, and in particular to a gap determination method, an air compressor, an engine and a vehicle. Background Art

[0002] In the related art, when manufacturing or designing an air compressor, it is necessary to determine the gap between the compressor casing and the impeller, i.e., the wheel-shell gap. The determined wheel-shell gap should satisfy the requirement that the gap between the impeller and the compressor casing is the smallest without interfering with the compressor casing, thereby meeting the working requirements of the air compressor.

[0003] However, in actual situations, the wheel housing clearance determined by theoretical calculations and other methods is often difficult to meet the working requirements of the air compressor, resulting in difficulty in quickly and accurately determining the wheel housing clearance when developing or designing the air compressor. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a gap determination method, an air compressor, an engine and a vehicle, wherein the gap determination method can quickly obtain an accurate wheel housing gap.

[0005] In the first aspect, an embodiment of the present application proposes a gap determination method, which is used to determine the gap between the compression casing and the impeller of an air compressor, including setting a cutting coating on the wall surface of the compression casing facing the impeller, and making the cutting coating interfere with the impeller; driving the impeller to operate, the impeller cuts the cutting coating to form a cutting surface on the cutting coating; after the impeller stops, obtaining the gap between the cutting surface and the impeller, and outputting the gap as the wheel casing gap.

[0006] According to the gap determination method of the embodiment of the present application, when designing an air compressor, the ideal wheel shell gap can be directly obtained by measuring the gap between the cutting surface and the impeller. Compared with the prior art, the steps for determining the ideal wheel shell gap are simplified, making the method simpler and faster. In addition, since the accurate ideal wheel shell gap can be directly obtained, there is no need to open the compressor shell multiple times when developing or designing the air compressor, thereby effectively reducing the cost required to design or develop the air compressor.

[0007] According to a further embodiment of the present application, the cutting coating is a thermoplastic polyimide material.

[0008] According to a further embodiment of the present application, the method further includes determining a theoretical gap between the compression shell and the impeller based on a dimensional tolerance and a geometric tolerance, and the thickness of the cutting coating is greater than the theoretical gap between the compression shell and the impeller.

[0009] Furthermore, the thickness of the cutting coating is greater than or equal to 2.5 mm.

[0010] Furthermore, the compression shell includes a compression shell body and a first bushing located on a side of the compression shell body facing the impeller, and the cutting coating is arranged on a side of the first bushing away from the compression shell body.

[0011] Furthermore, a fixing groove is configured on one side surface of the first bushing for setting the cutting coating; after the cutting coating is formed on the first bushing, at least a portion of the cutting coating is engaged with the fixing groove.

[0012] In a second aspect, the present application proposes an air compressor, including a compression casing and an impeller, wherein the gap between the compression casing and the impeller is the wheel casing gap determined by the gap determination method in the above embodiment.

[0013] Furthermore, the compression shell includes a compression shell body and a second bushing, and a gap between the second bushing and the impeller satisfies a wheel shell gap.

[0014] In a third aspect, the present application proposes an engine provided with the air compressor in the above-mentioned embodiment.

[0015] In a fourth aspect, the present application proposes a vehicle provided with the engine in the above-mentioned embodiment.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic flow chart of a gap determination method according to some embodiments of the present application;

[0019] Figure 2 is a schematic diagram of a partial cross-sectional structure of an air compressor for obtaining a wheel housing clearance according to some embodiments of the present application;

[0020] Figure 3 is a schematic diagram of the exploded structure of the compression shell, cutting coating, and impeller according to some embodiments of the present application;

[0021] Figure 4 is another exploded structural schematic diagram of a compression shell, a cutting coating, and an impeller according to some embodiments of the present application;

[0022] Figure 5 It is a schematic diagram of the partial cross-sectional structure of an air compressor according to some embodiments of the present application.

[0023] Reference numerals:

[0024] 100-air compressor;

[0025] 110-compression shell, 111-compression shell body, 1111-annular groove, 1112-annular flow chamber, 112-first bushing, 1121-first fixed groove, 11211-first section of the groove body, 11212-second section of the groove body, 1122-second fixed groove, 1123-third fixed groove, 113-second bushing;

[0026] 120-impeller;

[0027] 130-cutting coating;

[0028] a-Airflow channel. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0032] In the description of the present application, “plurality” means two or more.

[0033] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0034] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0035] Reference below Figure 1-Figure 5, describing a gap determination method, an air compressor 100, an engine, and a vehicle according to an embodiment of the present application.

[0036] According to the gap determination method of the embodiment of the present application, refer to Figure 1 It is understood that the method for determining the gap between the compressor casing 110 and the impeller 120 of the air compressor 100 includes:

[0037] A cutting coating 130 is disposed on a wall surface of the compression shell 110 facing the impeller 120 , and the cutting coating 130 interferes with the impeller 120 .

[0038] Among them, the texture of the cutting coating 130 should be relatively soft. For example, thermoplastic polyimide material is used to be suitable for cutting or scraping at least part of the cutting coating 130 through the impeller 120 without damaging the impeller 120 during the rotation of the impeller 120. The interference between the cutting coating 130 and the impeller 120 can be: the impeller 120 is in at least partial contact or full contact with the cutting coating 130, so that the gap between the impeller 120 and the compression shell 110 is filled by the cutting coating 130.

[0039] Then, the impeller 120 is driven to operate, and the impeller 120 cuts the cutting coating 130 to form a cutting surface on the cutting coating 130. Since the cutting surface is produced by cutting when the impeller 120 rotates, the cutting surface is substantially consistent with the outer contour of the impeller 120 when it is in operation. When the impeller 120 is in operation, it just does not interfere with the cutting surface, and the gap between the two is the ideal gap between the compressor casing 110 and the impeller 120 when the air compressor 100 is in operation.

[0040] After the impeller 120 stops rotating, the gap between the cutting surface and the impeller 120 is obtained. Since the current cutting surface satisfies the requirement of not interfering with the impeller 120 when it is running and the gap is minimal, the gap between the cutting surface and the impeller 120 is the ideal wheel shell gap.

[0041] Accordingly, the gap is output as the wheel shell gap, and the compression shell 110 is processed based on the wheel shell gap, so that the gap between the impeller 120 and the compression shell 110 of the actual product can be the above-mentioned ideal gap.

[0042] In the prior art, in order to obtain an ideal gap, it is necessary to preliminarily determine the theoretical value of the wheel shell gap through theoretical calculation, and process the compression shell 110 according to the theoretical value, and then measure the actual non-ideal wheel shell gap after the processed compression shell 110 is matched with the impeller 120. However, due to the limitations of theoretical calculation, there will be a deviation between the actual non-ideal wheel shell gap and the ideal gap after the compression shell 110 and the impeller 120 obtained by processing according to the theoretical value are matched. Specifically, if the wheel shell gap after matching is smaller than the ideal gap, it will cause interference between the compression shell and the impeller and cause damage to the parts; conversely, if the wheel shell gap after matching is larger than the ideal gap, it will affect the compression effect after the impeller works, resulting in poor performance of the air compressor, and then affecting the fuel consumption of the engine. Therefore, in order to make the gap between the processed compression shell 110 and the impeller 120 closer to the ideal gap, it is necessary to open the mold multiple times to make it closer to the ideal wheel shell gap and obtain the final product.

[0043] In contrast, the embodiment of the present application can directly obtain the ideal wheel shell gap by measuring the gap between the cutting surface and the impeller 120, and the wheel shell gap is less difficult to determine, and is simpler and faster. In addition, in the process of determining the ideal wheel shell gap, it is not necessary to adjust the gap multiple times to produce test shells with different gap sizes, thereby reducing the cost of the design and development process of determining the wheel shell gap.

[0044] It is worth noting that there are many ways to measure the gap between the cutting surface and the impeller 120, for example, directly measuring the distance between the impeller 120 and the cutting surface, or obtaining the parameters of the cutting surface by scanning, etc. The specific process will not be repeated here.

[0045] The impeller 120 and the compressor casing 110 provided in the air compressor 100 are taken as an example for description, so as to better understand the embodiments of the present application.

[0046] In the example, Figure 2 As shown, a cutting coating 130 is provided on the compression shell 110 of the air compressor 100, and it is ensured that after the air compressor 100 is assembled, the impeller 120 provided therein can interfere with the cutting coating 130. The side wall of the compression shell 110 facing the impeller 120 defines an air flow channel a, the cutting coating 130 is provided on the side wall facing the air flow channel a, and the impeller 120 is provided in the air flow channel a to match the setting area of ​​the cutting coating 130, so that the gas is guided into the air flow channel a through the operation of the impeller 120, and the cutting coating 130 is cut or scraped during operation.

[0047] Next, the operation and stop of the impeller 120 are described in detail, and in the subsequent contents, the wheel shell clearance refers to the clearance between the impeller 120 and the compression shell 110 when the impeller 120 is stationary.

[0048] Continue to refer Figure 2 First, assemble the air compressor 100, and then drive the impeller 120 to operate so that the operation of the impeller 120 reflects the actual working conditions, that is, the cutting surface formed by the cutting coating 130 when the impeller 120 is running is consistent with the edge profile of the impeller 120 when it is actually operating in the air compressor 100.

[0049] Here, the gap between the impeller 120 and the cutting surface when the impeller 120 is rotating is defined as a dynamic gap.

[0050] Specifically, the cutting surface is produced by the rotating impeller 120 during the actual working process, and the profile of the cutting surface is almost consistent with the edge profile of the impeller 120 when it rotates, and the corresponding dynamic clearance value is close to 0. Therefore, when the impeller 120 is running, the cutting surface can just not interfere with the impeller 120, and there will be no shell rubbing phenomenon, and the gap between the two is the smallest. In other words, the cutting surface is the ideal surface on the compression shell 110 for matching the impeller 120.

[0051] Then, after the cutting of the cutting coating 130 is completed, the rotation of the impeller 120 is stopped. Here, the gap between the cutting surface and the impeller 120 measured when the impeller 120 is stationary is defined as a static gap.

[0052] Since the cutting surface is the ideal profile of the compressor shell 110, the static clearance corresponds to the wheel shell clearance that can keep the impeller 120 and the compressor shell 110 from interfering with each other and has the most reasonable distance between the two. Therefore, the static clearance should be output as the wheel shell clearance, and the wheel shell and impeller can be produced based on the wheel shell clearance, so that the subsequently manufactured air compressor 100 can meet the corresponding wheel shell clearance to meet the working conditions of the air compressor 100.

[0053] It should be noted that, since the impeller 120 will inevitably form a certain installation error with the installation mechanism during installation, the impeller 120 will have a certain degree of movement during operation, and when the impeller 120 rotates, the impeller 120 is arranged in the airflow channel a and generates an airflow toward the compression shell 110 in the airflow channel a through its own rotation. Under the force of this airflow, the impeller 120 will have movement toward the compression shell 110. This makes the impeller 120 closer to the compression shell 110 when rotating compared to the position of the impeller 120 when it is stationary, so the dynamic clearance will be smaller than the static clearance.

[0054] That is, when the impeller 120 is stationary, there is a static gap between the impeller 120 and the cutting surface, and when the impeller 120 is running, there is a dynamic gap.

[0055] In detail, when manufacturing, designing, and assembling the air compressor 100, the impeller 120 is in a stationary state rather than in a running state. Therefore, in order to meet the working requirements of the air compressor 100, the static clearance should be used as the wheel shell clearance. After the static clearance is used as the wheel shell clearance, when the impeller 120 is running, the impeller 120 moves toward the compression shell, and the corresponding dynamic clearance will be close to 0, that is, the impeller 120 does not interfere with the compression shell 110 during operation, which can fully meet the working requirements of the air compressor 100.

[0056] Of course, the method of the present application is not limited to determining the wheel housing clearance of the air compressor 100, and can also be applied to other similar equipment, which will not be described in detail here.

[0057] Therefore, the outer contour of the impeller 120 during actual operation is reflected as a cutting surface formed by cutting by the operation of the impeller 120, so that the ideal profile of the compressor housing 110 is directly obtained without complicated steps, and the ideal wheel housing clearance is obtained. In addition, in the process of obtaining the ideal wheel housing clearance, it is not necessary to open the mold multiple times, but the ideal wheel housing clearance can be obtained directly.

[0058] According to the method for determining the wheel shell clearance of the embodiment of the present application, when designing an air compressor, the ideal wheel shell clearance can be directly obtained by measuring the clearance between the cutting surface and the impeller 120. Compared with the prior art, the steps for determining the ideal wheel shell clearance are simplified, making the method simpler and faster. In addition, since the accurate ideal wheel shell clearance can be directly obtained, it is not necessary to open the mold of the compressor shell 110 multiple times when developing or designing the air compressor, thereby effectively reducing the cost required for designing or developing the air compressor.

[0059] Here, the intermediate products obtained by the methods described in the above examples are described.

[0060] Continuing with the example of air compressor 100, Figure 2-Figure 4 As shown, the wheel shell is an annular structure, and the inner wall thereof is a smooth arc surface to define a gas flow channel, so that the gas flow channel can minimize the resistance of the gas flow while ensuring that the gas can be effectively guided and compressed.

[0061] The curved surface area of ​​the compression shell for defining the gas flow path is suitable for cooperating with the impeller 120, such as Figure 2-Figure 4 In the structure shown, the inner wall surface of the gas flow channel a is a curved surface, and the cutting coating 130 is coated on a partial curved surface area of ​​the inner wall of the gas flow channel and interferes with the impeller 120. When the impeller 120 rotates, the edge of the impeller 120 can contact the cutting coating 130 and produce a cutting effect.

[0062] In order to achieve cutting of the cutting coating 130 , the gap between the compression shell 110 itself (i.e., the part excluding the cutting coating 130 ) and the impeller 120 should be determined, so that the cutting coating 130 is set in the gap area between the compression shell 110 itself and the impeller 120 .

[0063] In some embodiments, the gap determination method further includes determining the compression shell theoretical gap based on the size tolerance and shape and position tolerance of the compression shell 110 and the impeller 120, and the thickness of the cutting coating 130 is greater than the compression shell theoretical gap. Here, the compression shell theoretical gap described is the gap between the compression shell 110 itself and the impeller 120, that is, it can be regarded as the distance between the compression shell 110 and the impeller 120 when the cutting coating 130 is not provided.

[0064] The dimensional tolerance data of the impeller 120 and the compression shell 110 are obtained, which usually include upper and lower deviations of key dimensions such as diameter and width, and the shape and position tolerances of the impeller 120 and the compression shell 110 usually include tolerances such as flatness, parallelism, and verticality. Based on the obtained dimensional tolerances and shape and position tolerances, the compression shell theoretical clearance is calculated according to the theoretical algorithm.

[0065] After the theoretical gap of the compression shell is obtained according to theoretical calculation, the thickness of the cutting coating 130 is configured to be greater than the theoretical gap of the compression shell, so that the cutting coating 130 can completely fill the theoretical gap of the compression shell between the compression shell 110 and the impeller. In other words, the cutting coating 130 will at least fill the theoretical gap of the compression shell, so that the cutting coating 130 contacts or overlaps with at least a part of the impeller 120 along its thickness direction, so that at least a part of the impeller 120 can contact with the cutting coating 130, so as to ensure that the impeller 120 can interfere with the cutting coating 130, so as to achieve the purpose of cutting or scraping the cutting coating 130 after the impeller 120 is running.

[0066] Therefore, determining the thickness of the cutting coating 130 based on the calculated theoretical gap of the compression shell can avoid the situation where the cutting coating thickness is set unreasonable, that is, it can avoid the thickness of the cutting coating 130 being too small to interfere with the impeller 120, or being too large so that the impeller 120 cuts too deep in the cutting area of ​​the cutting coating 130, resulting in an increase in the resistance of the impeller 120 to cutting the cutting coating 130.

[0067] It is understandable that the required thickness of the cutting coating 130 can be directly determined based on the theoretical gap of the compression shell without multiple adjustments to the thickness of the cutting coating 130, thereby simplifying the steps and avoiding the waste of coating materials in the process of determining the thickness of the cutting coating 130, thereby reducing material costs.

[0068] Furthermore, if the cutting coating 130 is too thin, then when in contact with the impeller 120, the cutting coating 130 may not be able to withstand the cutting force of the impeller 120 and may quickly fall off or deform or crack, which may result in an unclear cutting surface, or the cutting surface cannot be formed due to the cracking and falling of the cutting coating 130, and the wheel shell gap cannot be determined.

[0069] To this end, in some embodiments, the thickness of the cutting coating 130 should be greater than or equal to 2.5 mm.

[0070] It is understandable that a thicker coating has stronger structural strength and shear resistance. When the impeller 120 rotates at high speed and contacts the coating, greater shear force and friction force will be generated. If the coating is too thin, the stress distribution inside it will be more concentrated, causing the coating to be more easily damaged in local areas, such as falling off, deforming or cracking. A thicker coating can better disperse these stresses and reduce the risk of local damage, thereby maintaining the integrity and stability of the coating.

[0071] In addition, the area of ​​the cutting coating 130 used for interference should not be too deep. For example, the thickness of the cutting coating 130 used for cutting should be less than half of the overall thickness to avoid the cutting area being too deep, resulting in excessive contact area between the cutting coating 130 and the impeller 120, causing excessive force between the two and causing the cutting coating 130 to fall off.

[0072] In some examples, reference Figure 2-Figure 4 As shown, the compression shell 110 directly obtained by the method in the above embodiment includes a compression shell body 111 and a first bushing 112 located on the side of the compression shell body 111 facing the impeller 120, and the cutting coating 130 is arranged on the side of the first bushing 112 away from the compression shell body 111. The compression shell body 111 is formed with an annular groove 1111 for matching the first bushing 112, the first bushing 112 is arranged in the annular groove 1111, and the side of the first bushing 112 facing the impeller 120 is smoothly connected with the other inner walls of the air flow channel a to jointly define the air flow channel a, so that the cutting coating 130 arranged thereon is matched with the position of the impeller 120. When the impeller 120 is running, the impeller 120 and the cutting coating 130 arranged on the first bushing 112 are cut to form a cutting surface, and then the wheel shell clearance is determined based on the cutting surface.

[0073] It is understandable that the first bushing 112 is suitable for being disassembled from the compression shell body 111, so as to provide the cutting coating 130 on the disassembled first bushing 120. Compared with providing the cutting coating 130 on the compression shell 110 which is heavier and has a smaller operating space, providing the cutting coating 130 on the first bushing 112 is more convenient to operate due to its more compact structure and more operating space, so it is less difficult to provide the cutting coating 130 on the first bushing 112.

[0074] Based on the method described in this example, continue to refer to Figure 2-Figure 4 , an exemplary description is given of the intermediate products directly obtained therefrom.

[0075] In this example, the other side of the first bushing 112 is configured as an arc surface, and a cutting coating 130 is disposed on the arc surface, and the outer surface of the cutting coating 130 smoothly transitions to the inner wall surface of other areas of the airflow channel a. The cutting coating 130 is evenly arranged on the first bushing 112, and a fixing groove is formed on one side wall surface of the first bushing 112 for setting the cutting coating 130, and in the process of the cutting coating 130 being applied to the first bushing 112, a part of the cutting coating 130 will be formed in the fixing groove, so that the cutting coating 130 is embedded in the fixing groove.

[0076] For example, Figure 2 In the exemplary structure shown in , the fixing grooves include a first fixing groove 1121 , a second fixing groove 1122 and a third fixing groove 1123 which are sequentially arranged on the arc surface of the first bushing 112 along the axial direction thereof.

[0077] Specifically, the first fixed groove 1121 is arranged at the end of the first bushing 112, and the first groove body is an annular groove 1111, including a first section groove body 11211 and a second section groove body 11212 sequentially formed on the first bushing 112 along the thickness direction of the first bushing 112, wherein the width of the first section groove body 11211 along the axial direction of the first bushing 112 is smaller than the width of the second section groove body 11212 along the axial direction of the first bushing 112.

[0078] The second fixing groove 1122 is formed on the first bushing 112 along the axial direction of the first bushing 112, and the depth direction of the second fixing groove 1122 is opposite to the depth direction of the first fixing groove 1121. The third fixing groove 1123 is formed on the first bushing 112 along the axial direction of the first bushing 112, and the depth direction of the third fixing groove 1123 is opposite to the depth direction of the first fixing groove 1121.

[0079] Therefore, after the cutting coating 130 is formed on the first bushing 112, the portion of the cutting coating 130 formed in the fixing groove is engaged with the fixing groove, and each engaging portion is formed as a fixing point to improve the strength of the connection structure between the cutting coating 130 and the first bushing 112. In addition, since the extending direction of the first fixing groove 1121 is opposite to the direction of the second fixing groove 1122 and the third fixing groove 1123, the first fixing groove 1121 and the second fixing groove 1122 and the third fixing groove 1123 can form two pairs of oppositely arranged engaging structures to limit the movement of the cutting coating 130 relative to the first bushing 112 along the axial direction of the first bushing 112, thereby further improving the stability of the cutting coating 130 relative to the first bushing 112.

[0080] It is understandable that a plurality of fixing grooves are formed on the first bushing 112, and after the cutting coating 130 is formed on the first bushing 112, a portion engaged with the fixing groove is formed to increase the engaged portion to provide a fixing point for the first bushing 112 and the cutting coating 130, and increase the friction force at the fitting point between the two, thereby improving the stability of the cutting coating 130. In the process of the impeller 120 cutting the cutting coating 130, the cutting coating 130 is prevented from being dislocated and moved, thereby improving the cutting accuracy of the impeller 120 on the cutting coating 130.

[0081] According to any of the above embodiments, the cutting coating is preferably a thermoplastic polyimide material.

[0082] It is understood that the thermoplastic polyimide material has excellent thermoplasticity and processability, so as to be easily processed into a cutting coating 130 having a specific thickness and shape. In addition, the thermoplastic polyimide material is relatively soft and can be cut by the impeller 120. In addition, the thermoplastic polyimide material also has high toughness and can withstand a large shear force to prevent the cutting coating 130 from falling off, deforming or cracking when the impeller 120 rotates at a high speed and contacts the cutting coating 130.

[0083] The air compressor 100 according to the embodiment of the present application includes a compressor shell 110 and an impeller 120 , and the gap between the compressor shell 110 and the impeller 120 is the wheel shell gap determined by the gap determination method in the above embodiment.

[0084] It should be noted that the air compressor 100 described in the embodiment of the present application is a final product directly obtained according to the above-mentioned gap determination method, rather than an intermediate product obtained according to the above-mentioned method.

[0085] For example, the parameters of the cutting surface may be obtained so as to manufacture a side surface of the compression shell 110 facing the impeller 120 according to the parameters of the cutting surface, thereby obtaining the compression shell 110 that can meet the corresponding wheel shell clearance.

[0086] Specifically, according to the compression shell 110 manufactured or designed by the gap determination method in the above embodiment, when the impeller 120 is stationary, the gap defined between the compression shell 110 and the impeller 120 conforms to the static gap. Accordingly, after the impeller 120 is running, due to the movement of the impeller 120, the gap between the compression shell 110 and the impeller 120 will change to a dynamic gap, and the dynamic gap is close to 0.

[0087] It can be understood that, according to the air compressor directly obtained by the gap determination method in the above embodiment, since the gap between the compression shell 110 and the impeller 120 is an ideal wheel shell gap, the impeller 120 and the compression shell 110 have a smaller gap without interference, so that the impeller 120 can operate in a good working environment, and then the pressure end of the air compressor 100 (that is, the area where the impeller 120 and the compression shell 110 cooperate) can produce a good compression effect, so as to maintain the good working performance of the air compressor 100 and make the air compressor more energy efficient.

[0088] In some embodiments, Figure 5 As shown, the compressor shell 110 includes a compressor shell body 111 and a second bushing 113 , and the gap between the second bushing 113 and the impeller 120 satisfies the wheel shell gap obtained by the gap determination method in the above embodiment.

[0089] Exemplarily, the second bushing 113 may be manufactured according to the wheel housing clearance obtained by the cutting surface in the first bushing 112 in the above example, and the second bushing 113 is used to replace the first bushing 112 to obtain an air compressor that meets the wheel housing clearance requirements.

[0090] The compression shell body 111 is constructed as a ring body and its outer wall surface is formed as a stepped ring structure. The end surface of the compression shell body 111 used to connect the impeller 120 is also formed with an annular cavity 1112, and the annular cavity 1112 is connected with the air flow channel a. The inner wall surface of the compression shell body 111 is formed as an arc surface, and an annular groove 1111 for matching the second bushing 113 is provided in the middle area of ​​the arc surface. The annular groove 1111 is constructed as a stepped groove body, and the outer wall surface of the corresponding second bushing 113 is constructed as a stepped ring body, so as to be suitable for matching the outer wall surface of the second bushing 113 with the stepped structure of the annular groove 1111.

[0091] The other side of the second bushing 113 is configured as a cambered surface, which is configured as a structure consistent with the cutting surface obtained by the gap determination method in the above embodiment and is used to define the airflow channel a.

[0092] It can be understood that the second bushing 113 is disposed between the compressor body 111 and the impeller 120, so as to define a wheel-shell gap through the second bushing 113 and the impeller 120. The profile of one side of the second bushing 113 used to match the impeller 120 can be configured as the same profile as the cutting surface, so as to be suitable for defining a wheel-shell gap with the impeller 120 that meets the working requirements of the air compressor 100. Therefore, a plurality of second bushings 113 formed with different profiles can be matched with the same compressor body 111, and then different compressors 110 can be adapted to different impellers 120 only by replacing the second bushing 113, thereby reducing the research and development, design and even production costs.

[0093] The engine according to the embodiment of the present application is provided with the air compressor 100 in the above embodiment, and the air compressor 100 can be applied to components such as a turbocharger.

[0094] The vehicle according to the embodiment of the present application is provided with the engine in the above embodiment.

[0095] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" 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 application. 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 may be combined in any one or more embodiments or examples in a suitable manner.

[0096] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A gap determination method, the gap determination method being used to determine the gap between a compressor casing (110) and an impeller (120) of an air compressor, characterized in that: include: A cutting coating (130) is provided on a wall surface of the compression shell (110) facing the impeller (120), and the cutting coating (130) is made to interfere with the impeller (120); driving the impeller (120) to operate, so that the impeller (120) cuts the cutting coating (130) to form a cutting surface on the cutting coating (130); After the impeller (120) stops rotating, the gap between the cutting surface and the impeller (120) is obtained, and the gap is output as a wheel shell gap.

2. The gap determination method according to claim 1, characterized in that: The cutting coating (130) is a thermoplastic polyimide material.

3. The gap determination method according to claim 1, characterized in that: The method further comprises: determining the compression shell theoretical clearance based on the dimensional tolerance and the geometric tolerance of the compression shell (110) and the impeller (120); The cutting coating (130) has a thickness greater than the compression shell theoretical gap.

4. The gap determination method according to claim 3, characterized in that: The cutting coating (130) has a thickness greater than or equal to 2.5 mm.

5. The gap determination method according to any one of claims 1 to 4, characterized in that: The compression shell (110) comprises: a compression shell body (111) and a first bushing (112) located on a side of the compression shell body (111) facing the impeller (120), and the cutting coating (130) is arranged on a side of the first bushing (112) away from the compression shell body (111).

6. The gap determination method according to claim 5, characterized in that: A fixing groove is configured on one side surface of the first bushing (112) for arranging the cutting coating (130); After the cutting coating (130) is formed on the first bushing (112), at least a portion of the cutting coating (130) is engaged with the fixing groove.

7. An air compressor, characterized in that: include: A compression shell (110) and an impeller (120), wherein a gap between the compression shell (110) and the impeller (120) is the wheel shell gap determined according to the gap determination method according to any one of claims 1 to 6.

8. The air compressor according to claim 7, characterized in that: The compressor shell (110) comprises: a compressor shell body (111) and a second bushing (113), wherein a gap between the second bushing (113) and the impeller (120) satisfies the wheel shell gap.

9. An engine, characterized in that: An air compressor according to claim 8 is provided.

10. A vehicle, characterized in that: An engine according to claim 9 is provided.

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