A method and equipment for measuring the surface pressure of vane pump blades based on rotating non-contact wireless pressure measurement

Abstract

The present invention discloses a method for measuring the surface pressure of a vane pump blade based on rotational non-contact wireless pressure measurement, and a vane pump surface pressure measurement device based on the method. The method comprises the following steps: selecting a profile line on the blade surface for setting the blade height; determining multiple installation positions with the same axial plane angle within the profile line; providing multiple assembly slots corresponding to the multiple installation positions; and installing multiple pressure sensors in the multiple assembly slots in a one-to-one correspondence. The method for measuring the surface pressure of a vane pump blade based on rotational non-contact wireless pressure measurement according to the embodiment of the present invention can measure the pressure on the blade surface while the blade is rotating.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring equipment, and in particular to a method for measuring the surface pressure of a vane pump blade based on rotating non-contact wireless pressure measurement and equipment for measuring the surface pressure of a vane pump blade based on the method. Background Art

[0002] Vane pumps are fluid machines that convert mechanical energy into fluid energy and are widely used in industrial and agricultural production, marine engineering, aerospace, and other fields. When the vane pump is operating, the complex flow of the internal fluid induces flow field pressure pulsations, causing dynamic changes in the blade load. In severe cases, this can lead to blade vibration, threatening the safe and reliable operation of the vane pump. Therefore, it is necessary to measure the surface pressure of the vane pump blades to obtain information on flow field pressure pulsations and blade load changes. However, the measurement methods used in related technologies are unable to measure the surface pressure of rotating blades. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, an embodiment of the present invention provides a method for measuring the surface pressure of a vane pump blade based on rotational non-contact wireless pressure measurement. This method has the advantage of being able to measure the pressure on the blade surface while the blade is rotating.

[0004] The embodiment of the present invention also provides a vane pump blade surface pressure measurement device based on rotational non-contact wireless pressure measurement.

[0005] The method for measuring the surface pressure of a vane pump blade according to an embodiment of the present invention is applied to the vane pump blade surface pressure measuring equipment described in any one of the above claims. The method for measuring the surface pressure of a vane pump blade comprises the following steps:

[0006] Select a profile line on the blade surface to set the blade height;

[0007] Determining a plurality of installation positions having the same axial plane angle in the profile;

[0008] A plurality of assembly slots are provided correspondingly to a plurality of installation positions;

[0009] The plurality of pressure sensors are installed in the plurality of assembly grooves in a one-to-one correspondence.

[0010] The method for measuring the surface pressure of a vane pump blade according to the embodiment of the present invention has the advantage of being able to measure the pressure on the surface of the blade while the blade is rotating.

[0011] In some embodiments, determining a plurality of installation positions having the same axial plane angle in the profile comprises the following steps:

[0012] Establish a plane rectangular coordinate system with the center of the circle where the impeller rotates as the origin;

[0013] Pick n random points on the profile line and obtain the coordinates (x i ,y i ); According to the coordinates of each random point, the axial angle between each two adjacent random points is obtained

[0014]

[0015] According to the axial angle between each two adjacent random points, the axial angle between the i-th random point and the leading edge point of the profile is obtained.

[0016]

[0017] The total wrap angle of the blade on the profile is obtained according to the axial plane angle between each two adjacent random points

[0018]

[0019] Obtain the coordinates (x, y) of any point on the profile in the plane rectangular coordinate system and the axial angle of the point on the profile Functional relationship between

[0020]

[0021] If the number of multiple installation positions on the profile is m, then the axial angle of the kth installation position is

[0022]

[0023] According to the functional relationship between the coordinates of the points on the profile and the axial plane angle, the coordinates of the kth installation position in the plane rectangular coordinate system are obtained.

[0024] In some embodiments, the coordinates (x, y) of any point on the profile in the plane rectangular coordinate system and the axial plane angle of the point on the profile are obtained. The functional relationship between includes the following steps:

[0025] Use (n-1) function to establish the angle between x and axis Functional relationship between and y-axis angle Functional relationship between

[0026]

[0027]

[0028] The coordinates (x i ,y i ) are substituted into and In the solution, we can get a1,a2,a3,···,a n The values ​​of b1, b2, b3, · · ·, b n The value of , and then determine the function

[0029] The vane pump blade surface pressure measurement equipment based on rotary non-contact wireless pressure measurement in an embodiment of the present invention includes an impeller, the impeller includes multiple blades, and the blade surface of at least one of the blades is provided with multiple assembly grooves, and the multiple assembly grooves are arranged along the blade's profile and along the angle dividing points; multiple pressure sensors, the multiple pressure sensors are installed in the multiple assembly grooves in a one-to-one correspondence to convert the blade surface pressure information into electrical signals; a transmission component and a detection component, the transmission component is connected to the pressure sensor to be suitable for receiving the electrical signal generated by the pressure sensor and wirelessly transmitting the electrical signal to the detection component.

[0030] The vane pump blade surface pressure measurement equipment based on rotational non-contact wireless pressure measurement according to the embodiment of the present invention has the advantage of being able to measure the pressure on the blade surface during the blade rotation process.

[0031] In some embodiments, the impeller includes a rotating shaft, a plurality of blades are arranged at intervals along the circumference of the impeller, a portion of the rotating shaft extends out of the pump body of the vane pump to form an extended section, and the transmission component includes a wireless signal transmitter, which is located in the extended section to be suitable for wireless connection with the detection component.

[0032] In some embodiments, the transmission component includes a transmission line, a first wire groove is provided on the surface of the rotating shaft, the first wire groove extends from the blade to the extension section, a second wire groove is provided on the surface of the blade, the second wire groove is connected to multiple assembly grooves, and the second wire groove is connected to the first wire groove, part of the transmission line is assembled in the first wire groove and connected to multiple pressure sensors, and part of the transmission line is assembled in the second wire groove and connected to the wireless signal transmitter.

[0033] In some embodiments, the impeller includes a rear cover plate, which extends orthogonally to the axial direction of the rotating shaft, and one end of each of the blades in the height direction is connected to the rear cover plate, the second line groove includes a first section, a second section and a third section, the first section is provided on the blade surface of the blade and extends along the shaped line direction of the impeller, and the first section is connected to the plurality of assembly grooves, the second section extends orthogonally to the shaped line direction of the impeller, one end of the second section is connected to the first section, the other end of the second section passes through the rear cover plate and is connected to one end of the third section, and the other end of the third section extends radially along the rear cover plate to the first line groove.

[0034] In some embodiments, the second wire groove is filled with a filler to make the surface of the blade and the surface of the rear cover smooth and continuous;

[0035] And / or, the first wire groove is filled with a filling body to make the circumference of the rotating shaft smooth and continuous.

[0036] In some embodiments, an elastic sealing body is provided in the assembly groove, and the elastic sealing body is located between the blade surface filled with the blade and the pressure sensor.

[0037] In some embodiments, a plurality of the assembly grooves are spaced apart along the height direction of the blade to form a plurality of groove groups, each of the groove groups extends along the same blade profile, and any two adjacent assembly grooves in each of the groove groups are spaced at the same axial angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a cross-sectional schematic diagram of a vane pump blade surface pressure measurement device based on rotational non-contact wireless pressure measurement according to an embodiment of the present invention.

[0039] Figure 2 Schematic diagram of an impeller of a vane pump blade surface pressure measurement device based on rotational non-contact wireless pressure measurement according to an embodiment of the present invention.

[0040] Figure 3 It is a schematic diagram of a detection component of a vane pump blade surface pressure measurement device based on rotational non-contact wireless pressure measurement according to an embodiment of the present invention.

[0041] Figure 4 Schematic diagram of a method for measuring the surface pressure of a vane pump blade based on rotating non-contact wireless pressure measurement according to an embodiment of the present invention.

[0042] Figure 5 Schematic diagram of a blade of a vane pump blade surface pressure measurement device based on rotational non-contact wireless pressure measurement according to an embodiment of the present invention.

[0043] Figure 6Schematic diagram of a rear cover plate of a vane pump blade surface pressure measurement device based on rotational non-contact wireless pressure measurement according to an embodiment of the present invention.

[0044] Figure 7 Schematic diagram of a first line slot of a vane pump blade surface pressure measurement device based on rotational non-contact wireless pressure measurement according to an embodiment of the present invention.

[0045] Reference numerals:

[0046] Impeller 1; blade 11; assembly groove 111; shaft 12; first wire groove 13; second wire groove 14; first section 141; second section 142; third section 143; rear cover 15;

[0047] Pump body 2;

[0048] Transmission component 3; wireless signal transmitter 31; transmission line 32;

[0049] Detection component 4; wireless signal receiver 41; data collector 42; computer 43. DETAILED DESCRIPTION

[0050] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0051] The following combination Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 7 A vane pump vane surface pressure measurement device according to an embodiment of the present invention will be described.

[0052] The vane pump blade surface pressure measurement equipment based on rotational non-contact wireless pressure measurement according to an embodiment of the present invention includes an impeller 1 , a plurality of pressure sensors, a transmission component 3 and a detection component 4 .

[0053] The impeller 1 includes a plurality of blades 11 . A plurality of assembly grooves 111 are provided on the surface of at least one blade 11 . The plurality of assembly grooves 111 are arranged along the contour of the blade 11 and along the equally divided points of the wrap angle.

[0054] Specifically, multiple blades 11 are arranged at equal intervals along the circumference of the impeller 1, the blade surface of the blade 11 is the end face of the blade 11 in the thickness direction, the profile of the blade 11 is the contour curve of the blade 11 at a certain height of the blade 11, and the profile extends along the blade surface of the blade 11. When the impeller 1 rotates, any point on the profile rotates along the intersection of the axis of the impeller 1 and the above-mentioned cross-section. The angle between the line connecting any two points on the profile and the intersection is the axial plane angle between the two points on the profile. Multiple assembly grooves 111 are arranged at equal intervals along the angle of the blade 11 profile so that the axial plane angle between any two adjacent assembly grooves 111 is the same.

[0055] The multiple assembly grooves 111 have the same shape, and the geometric centers of the multiple assembly grooves 111 are all located on the profile line. The axial plane angles between the geometric centers of any two adjacent assembly grooves 111 are the same, so that the multiple assembly grooves 111 are arranged at the same axial plane angle along a certain profile line of the blade 11.

[0056] The plurality of pressure sensors are mounted in a one-to-one correspondence in the plurality of assembly slots 111 to convert the pressure information on the surface of the blade 11 into an electrical signal.

[0057] Specifically, the pressure sensor is arranged in the assembly groove 111, and the pressure sensitive element is arranged on one side of the opening of the assembly groove 111. When the surface of the blade 11 is subjected to pressure, the pressure sensitive element converts the pressure on the surface of the blade 11 into an analog electrical signal, and multiple pressure sensors are also arranged at the same axial angle along a certain profile line of the blade 11. When the blade 11 is working, multiple pressure sensors can realize pressure measurement at the angular position of the blade 11 that is equally divided by the wrap angle, providing load information at key positions for the optimized design of the impeller 1.

[0058] The transmission component 3 is connected to the pressure sensor so as to receive the electrical signal generated by the pressure sensor and wirelessly transmit the electrical signal to the detection component 4 .

[0059] Specifically, the transmission component 3 is connected to the pressure sensor, the transmission component 3 is arranged in the vane pump, and at least part of the transmission component 3 is arranged in the impeller 1 and rotates with the impeller 1. The transmission component 3 converts the analog electrical signals generated by multiple pressure sensors into digital electrical signals and transmits them to the detection component 4 via wireless transmission. The transmission component 3 and the detection component 4 are connected via wireless communication, so that the detection component 4 can rotate without rotating with the impeller 1, thereby realizing real-time transmission of the surface load of the blade 11.

[0060] The vane pump blade surface pressure measurement equipment based on rotary non-contact wireless pressure measurement according to an embodiment of the present invention arranges multiple pressure sensors along a profile line of blade 11 at equal axial angles, thereby enabling pressure measurement at angular positions that divide the blade 11 into equal parts, providing load information at key positions for the optimized design of impeller 1. By wirelessly connecting transmission component 3 to detection component 4, detection component 4 is disconnected from impeller 1. When impeller 1 rotates, transmission component 3 can transmit the load on the surface of blade 11 to detection component 4 in real time, thereby giving the vane pump blade surface pressure measurement equipment based on rotary non-contact wireless pressure measurement according to an embodiment of the present invention the advantage of being able to measure the pressure on the surface of blade 11 while blade 11 is rotating.

[0061] In some embodiments, each of the blades 11 of the impeller 1 is provided with a mounting groove 111, and each of the mounting grooves 111 of the blades 11 is provided with a pressure sensor. Thus, the pressure sensors on the blades 11 can detect the pressure on the surfaces of the blades 11 when the impeller 1 rotates.

[0062] In some embodiments, the impeller 1 includes a rotating shaft 12, a plurality of blades 11 are arranged at intervals along the circumference of the impeller 1, a portion of the rotating shaft 12 extends out of the pump body 2 of the vane pump to form an extended section, and the transmission component 3 includes a wireless signal transmitter 31, which is located in the extended section to be suitable for wireless connection with the detection component 4.

[0063] Specifically, the rotating shaft 12 extends along the axial direction of the impeller 1, and the multiple blades 11 are arranged at equal intervals along the circumference of the rotating shaft 12. When the impeller 1 rotates, the multiple blades 11 rotate around the rotating shaft 12. The vane pump includes a pump body 2, the blades 11 and part of the rotating shaft 12 are located in the pump body 2, and the rear end of the rotating shaft 12 extends to the outside of the pump body 2. The part of the rotating shaft 12 located outside the pump body 2 forms an extended section.

[0064] The transmission component 3 includes a wireless signal transmitter 31, which is connected to multiple pressure sensors. The wireless signal transmitter 31 converts the analog electrical signals generated by the multiple pressure sensors into digital electrical signals and sends them to the detection component 4 via wireless communication. The wireless signal transmitter 31 is arranged on the extension section.

[0065] Therefore, the wireless signal transmitter 31 is located on the extended section of the rotating shaft 12. On the one hand, the signal shielding effect of the pump body 2 on the wireless signal transmitter 31 is reduced, and the intensity of the electromagnetic waves emitted by the wireless signal transmitter 31 received by the detection component 4 is improved. On the other hand, the wireless signal transmitter 31 is located on the outside of the pump body 2, which can effectively prevent water from entering the wireless signal transmitter 31, reduce the failure rate of the wireless signal transmitter 31, and thus improve the working efficiency of the vane pump blade surface pressure measurement equipment of the embodiment of the present invention.

[0066] In some embodiments, the transmission component 3 includes a transmission line 32, a first wire groove 13 is provided on the surface of the rotating shaft 12, the first wire groove 13 extends from the blade 11 to the extension section, a second wire groove 14 is provided on the surface of the blade 11, the second wire groove 14 is connected to multiple assembly grooves 111, and the second wire groove 14 is connected to the first wire groove 13, part of the transmission line 32 is assembled in the first wire groove 13 and connected to multiple pressure sensors, and part of the transmission line 32 is assembled in the second wire groove 14 and connected to the wireless signal transmitter 31.

[0067] Specifically, the transmission line 32 is connected between multiple pressure sensors and the wireless signal transmitter 31, the first wire groove 13 is provided on the surface of the rotating shaft 12, and the first wire groove 13 extends along the axial direction of the rotating shaft 12, the second wire groove 14 is provided on the surface of the blade 11, and the second wire groove 14 extends along the surface of the blade 11, and one end of the second wire groove 14 is connected to one end of the first wire groove 13, and the other end of the first wire groove 13 extends to the wireless signal transmitter 31, and the second wire groove 14 is connected to multiple assembly grooves 111, the transmission line 32 is embedded in the first wire groove 13 and the second wire groove 14, and the transmission line 32 is connected between multiple pressure sensors and the wireless signal transmitter 31.

[0068] Therefore, the transmission line 32 is arranged in the second wire groove 14 and the first wire groove 13, so that the transmission line 32 is embedded in the blade 11 and the rotating shaft 12 as a whole. When the impeller 1 rotates, the transmission line 32 does not affect the operation of the impeller 1, reducing the influence of the transmission component 3 on the working condition of the blade 11, so that the vane pump blade surface pressure measurement equipment of the embodiment of the present invention has the advantage of being able to measure the surface pressure of the blade 11 in real time during the rotation of the impeller 1.

[0069] In some embodiments, the impeller 1 includes a rear cover plate 15, which extends orthogonally to the axial direction of the rotating shaft 12, and one end of the plurality of blades 11 in the width (height) direction is connected to the rear cover plate 15, and the second line groove 14 includes a first section 141, a second section 142 and a third section 143. The first section 141 is provided on the blade surface of the blade 11 and extends along the profile direction of the impeller 1, and the first section 141 is connected to the plurality of assembly grooves 111. The second section 142 extends orthogonally to the profile direction of the impeller 1, one end of the second section 142 is connected to the first section 141, the other end of the second section 142 passes through the rear cover plate 15 and is connected to one end of the third section 143, and the other end of the third section 143 extends along the radial direction of the rear cover plate 15 to the first line groove 13.

[0070] Specifically, the rear cover plate 15 is arranged on the rear side of the blade 11, and the rear cover plate 15 extends along the cross-section of the rotating shaft 12. The rear ends of multiple blades 11 are connected to the front end face of the rear cover plate 15. The first section 141, the second section 142 and the third section 143 are connected end to end. The first section 141 is connected along the profile of the impeller 1, and the first section 141 is connected to multiple assembly grooves 111. The third section 143 is arranged on the rear end face of the rear cover plate 15. The third section 143 extends along the radial direction of the rear cover plate 15. One end of the third section 143 is connected to an end of the first wire groove 13 away from the wireless signal transmitter 31, one end of the second section 142 is connected to an end of the first section 141 close to the outside of the blade 11, and the other end of the second section 142 passes through the blade 11 and is connected to the other end of the third section 143.

[0071] Therefore, the first section 141 extends along the profile of the blade 11. On the one hand, the first section 141 is roughly the same as the arrangement direction of the multiple assembly slots 111, which facilitates the connection of the multiple pressure sensors in the multiple assembly slots 111 with the transmission line 32 in the first section 141. On the other hand, the influence of the first section 141 on the blade surface shape of the blade 11 is reduced, so that the surface working condition of the blade 11 is closer to the actual working condition when the impeller 1 rotates, thereby making the vane pump blade surface pressure measurement equipment of the embodiment of the present invention have the advantage of being able to measure the surface pressure of the blade 11 in real time during the rotation of the impeller 1.

[0072] The second section 142 is connected to one end of the first section 141 close to the outer side of the blade 11. When the impeller 1 rotates, the second section 142 is located downstream of the fluid flowing along the surface of the blade 11, and the second section 142 is located downstream of multiple pressure sensors, thereby preventing the second section 142 from affecting the operation of multiple pressure sensors.

[0073] In some embodiments, the second wire groove 14 is filled with a filler to make the surface of the blade 11 and the surface of the rear cover 15 smooth and continuous; and / or, the first wire groove 13 is filled with a filler to make the circumference of the rotating shaft 12 smooth and continuous.

[0074] Specifically, the filling body is filled in the second wire groove 14 and the first wire groove 13, and part of the filling body is filled between the part of the transmission line 32 in the second wire groove 14 and the surface contour of the impeller 1, so that the surface contour of the blade 11 and the rear cover plate 15 is consistent with the shape before the grooving. In addition, part of the filling body is located in the first wire groove 13, and is filled between the part of the transmission line 32 in the first wire groove 13 and the surface contour of the rotating shaft 12, so that the surface contour of the rotating shaft 12 is consistent with the contour before the first wire groove 13 is opened on the rotating shaft 12.

[0075] Thus, the filling body is filled in the first line groove 13 and the second line groove 14, so that the surface profiles of the blades 11, the rear cover plate 15 and the rotating shaft 12 of the impeller 1 are consistent with the surface profiles when the first line groove 13 and the second line groove 14 are not provided. Therefore, when the impeller 1 rotates, the influence of the first line groove 13 and the second line groove 14 on the working condition of the impeller 1 is reduced, so that the surface working condition of the blade 11 when the impeller 1 rotates is closer to the actual working condition, so that the vane pump blade surface pressure measurement equipment of the embodiment of the present invention has the advantage of being able to measure the surface pressure of the blade 11 in real time during the rotation of the impeller 1.

[0076] In some embodiments, an elastic sealing body is provided in the assembly groove 111 , and the elastic sealing body is located between the blade surface filled in the blade 11 and the pressure sensor.

[0077] Specifically, the elastic sealing body is arranged between the surface contour of the blade 11 and the pressure sensor, and seals and isolates the pressure sensor from the surface of the blade 11. The elastic sealing body is a silicone rubber coating. One end of the elastic sealing body coincides with the surface contour of the blade 11, and the other end of the elastic sealing body is connected to the pressure-sensitive element of the pressure sensor.

[0078] When the impeller 1 is working, the fluid flows through the blade surface of the blade 11 and generates pressure on the surface of the blade 11. The pressure is transmitted to the pressure sensitive element of the pressure sensor through the elastic sealing body, and the pressure sensitive element of the pressure sensor is pressed to convert the pressure information into an electrical signal and transmit it to the wireless signal transmitter 31 through the transmission line 32.

[0079] Thus, on the one hand, the elastic seal seals the pressure sensor in the assembly groove 111, preventing water from entering the pressure sensor. On the other hand, the elastic seal transmits the pressure on the surface of the blade 11 to the pressure sensor without affecting its operation. In addition, one end of the elastic seal coincides with the surface contour of the blade 11, making the surface operating conditions of the blade 11 closer to the actual operating conditions when the impeller 1 rotates. This gives the vane pump blade surface pressure measurement device according to the present invention the advantage of being able to measure the surface pressure of the blade 11 in real time during the rotation of the impeller 1.

[0080] In some embodiments, multiple assembly slots 111 are arranged at intervals along the width direction of the blade 11 to form multiple slot groups, each slot group extends along the same blade 11 profile, and any two adjacent assembly slots 111 in each slot group are spaced at the same axial angle.

[0081] Specifically, the height direction of the blade 11 is the front-to-back direction, and multiple slot groups are arranged at intervals along the front-to-back direction on the blade surface of the same blade 11, and the multiple assembly slots 111 in each slot group are arranged along a certain contour line of the blade 11 along the equally divided point of the wrap angle, and different slot groups correspond to different contour lines.

[0082] Thus, multiple groups of pressure sensors extending along different profiles on the same blade 11 can detect blade surface pressures at different profiles when the impeller 1 rotates, providing load information at key positions for optimal design of the impeller 1 .

[0083] In some embodiments, the detection component 4 includes a wireless signal receiver and a data collector 42. The wireless signal receiver is suitable for wireless communication connection with the wireless signal transmitting element, and the data collector 42 is communicatively connected with the wireless signal receiver to collect pressure information on the surface of the blade 11 and transmit it to the computer 43 in real time.

[0084] The following combination Figure 4 A method for measuring the surface pressure of a vane pump blade according to an embodiment of the present invention is described.

[0085] The method for measuring the surface pressure of a vane pump blade according to an embodiment of the present invention is applied to the vane pump blade surface pressure measuring equipment according to any one of the above claims. The method for measuring the surface pressure of a vane pump blade comprises the following steps:

[0086] A profile for setting the blade height is selected on the surface of the blade 11 .

[0087] Determine multiple installation positions with the same axis angle in the profile;

[0088] A plurality of assembly slots are provided correspondingly to a plurality of installation positions;

[0089] The plurality of pressure sensors are installed in the plurality of assembly grooves in a one-to-one correspondence.

[0090] Specifically, at any blade height on the surface of the blade 11, a profile line AB corresponding to the blade height is selected, and multiple points with the same axial angle are determined on this segment of the profile line AB. With each point as the geometric center, multiple assembly grooves are opened along the normal direction of the blade surface at each point. The depth dimensions of the multiple assembly grooves are the same, and pressure sensors are installed in the multiple assembly grooves in a one-to-one correspondence.

[0091] Thus, by arranging multiple pressure sensors at equal axial angles along a profile line of blade 11, it is possible to measure pressure at equally divided angular positions of blade 11, providing load information at key locations for the optimized design of impeller 1. Multiple assembly slots are provided along the normal direction of the blade surface at each point, ensuring that the force applied to each pressure sensor is in the same direction as the force applied to the location where the pressure sensor is installed.

[0092] In some embodiments, determining a plurality of installation positions having the same axial face angle in the profile includes the following steps:

[0093] Establish a plane rectangular coordinate system with the intersection of the plane where the profile is located and the axis of impeller 1 as the origin;

[0094] Pick n random points on the line and get the coordinates (x i ,y i );

[0095] According to the coordinates of each random point, the axial angle between each two adjacent random points is obtained

[0096]

[0097] According to the axial angle between each two adjacent random points, the axial angle between the i-th random point and the leading edge point of the profile is obtained.

[0098]

[0099] The total wrap angle of the blade 11 on the profile is obtained according to the axial plane angle between each two adjacent random points

[0100]

[0101] Get the coordinates (x, y) of any point on the line in the plane rectangular coordinate system and the axial angle of the point on the line Functional relationship between

[0102]

[0103] If the number of multiple installation positions on the profile is m, then the axial angle of the kth installation position is

[0104]

[0105] According to the functional relationship between the coordinates of the points on the profile and the axial plane angle, the coordinates of the kth installation position in the plane rectangular coordinate system are obtained.

[0106] Specifically, each profile line is located one-to-one in the cross section of any blade height of the blade 11. The intersection of the cross-sectional plane corresponding to each profile line segment and the axis of the impeller 1 is the center O of the circle where each point on the profile line rotates when the impeller 1 rotates. A plane rectangular coordinate system is established in the plane where the profile line segment is located with the center O of the circle where each point on the profile line rotates when the impeller 1 rotates as the origin. Any point on the profile line segment has corresponding coordinates (x, y) in the plane rectangular coordinate system. The axial plane angle of any point on the profile line segment is the angle between the line connecting the point and the origin O of the plane rectangular coordinate system and the x-axis direction of the plane rectangular coordinate system.

[0107] There is a definite functional relationship between the coordinates of any point on the line segment AB and the corresponding axial angle of the point. The axial angle spacing between the beginning and end of the line segment AB is the total angle of the line segment. There are m installation positions in the line segment AB, and the m installation positions divide the line segment into m-1 segments, so the axial angle between any two adjacent installation positions is determined to be Thus, the axial plane angle of each k-th installation position is determined The coordinates of the kth point can be obtained based on the functional relationship between the coordinates of the points on the profile line AB and the axial angle.

[0108] In some embodiments, the coordinates (x, y) of any point on the profile in the plane rectangular coordinate system and the axial angle of the point on the profile are obtained. The functional relationship between includes the following steps:

[0109] Use (n-1) function to establish the angle between x and axis Functional relationship between and y-axis angle Functional relationship between

[0110]

[0111]

[0112] The coordinates (x i ,y i ) are substituted into and In the solution, we can get a1,a2,a3,···,a n The values ​​of b1, b2, b3, · · ·, b n The value of , and then determine the function Specifically, the axial angle between the i-th random point and the leading edge point of the profile is The leading edge of the profile is the endpoint of the profile segment closest to the axis of the impeller 1. The (n-1) function is used to establish the angle between x and the axis. Functional relationship between

[0113]

[0114] Substitute the coordinates and axis angles of n random points into the function You can get information about a n The n-variable linear equation system is solved to obtain a1,a2,a3,···,a n The value of , thus determining the function Similarly, the same method can be used to obtain y and (n-1)th order function between Therefore, the functional relationship between the coordinates of any point on the line segment and the axial plane angle of the point can be simulated based on the coordinates and axial plane angles of multiple random points.

[0115] In the description of the present invention, 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 to 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 invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0116] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0117] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0118] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0119] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean 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 expressions of the above terms do 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. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0120] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A method for measuring the surface pressure of a vane pump blade based on rotating non-contact wireless pressure measurement, characterized in that: The steps include: Select a profile line on the blade surface to set the blade height; Determining a plurality of installation positions having the same axial plane angle in the profile; A plurality of assembly slots are provided correspondingly to a plurality of installation positions; Installing the multiple pressure sensors in the multiple assembly slots in a one-to-one correspondence; Determining a plurality of installation positions having the same axial plane angle in the profile comprises the following steps: Establish a plane rectangular coordinate system with the center of the circle where the impeller rotates as the origin; Pick n random points on the profile line and obtain the coordinates of each random point in the plane rectangular coordinate system ( x i , y i ); According to the coordinates of each random point, the axial angle between each two adjacent random points is obtained ； The first i The axial angle between a random point and the leading edge point of the profile ； The total wrap angle of the blade on the profile is obtained according to the axial plane angle between each two adjacent random points ； Obtain the coordinates of any point on the profile in the plane rectangular coordinate system ( x , y ) and the axial angle of the point on the profile φ Functional relationship between ； If the number of multiple installation positions on the profile is m , then k The axial angle of each installation position is ； According to the functional relationship between the coordinates of the points on the profile and the axial angle, the k The coordinates of the installation positions in the plane rectangular coordinate system.

2. The method for measuring the surface pressure of a vane pump blade based on rotational non-contact wireless pressure measurement according to claim 1, characterized in that: Get the coordinates of any point on the profile in the plane rectangular coordinate system ( x , y ) and the axial angle of the point on the profile φ The functional relationship between includes the following steps: use( n -1) Secondary function establishment x Angle with axis φ Functional relationship between x ( φ )and y Angle with axis φ Functional relationship between y ( φ ) ， ； Will n The coordinates of a random point in the plane rectangular coordinate system ( x i , y i ) are substituted into x ( φ )and y ( φ ), we can solve a 1, a 2, a 3,···, a n The value and b 1, b 2, b 3,···, b n The value of , and then determine the function .

3. A vane pump blade surface pressure measurement device based on the vane pump blade surface pressure measurement method based on rotational non-contact wireless pressure measurement according to any one of claims 1-2, characterized in that: include: An impeller comprising a plurality of blades, wherein a plurality of assembly grooves are provided on a blade surface of at least one of the blades, and the plurality of assembly grooves are arranged along the profile of the blade and along the points dividing the wrap angle equally; A plurality of pressure sensors, wherein the plurality of pressure sensors are mounted in a one-to-one correspondence in the plurality of assembly slots to convert the pressure information on the blade surface into an electrical signal; A transmission component and a detection component, wherein the transmission component is connected to the pressure sensor to receive the electrical signal generated by the pressure sensor and wirelessly transmit the electrical signal to the detection component.

4. The vane pump blade surface pressure measurement equipment according to claim 3, characterized in that: The impeller includes a rotating shaft, and a plurality of blades are arranged at intervals along the circumference of the impeller. Part of the rotating shaft extends out of the pump body of the vane pump to form an extended section. The transmission component includes a wireless signal transmitter, and the wireless signal transmitter is located in the extended section to be suitable for wireless connection with the detection component.

5. The vane pump blade surface pressure measurement equipment according to claim 4, characterized in that: The transmission component includes a transmission line, a first wire groove is provided on the surface of the rotating shaft, the first wire groove extends from the blade to the extension section, a second wire groove is provided on the surface of the blade, the second wire groove is connected to multiple assembly grooves, and the second wire groove is connected to the first wire groove, part of the transmission line is assembled in the first wire groove and connected to multiple pressure sensors, and part of the transmission line is assembled in the second wire groove and connected to the wireless signal transmitter.

6. The vane pump blade surface pressure measurement equipment according to claim 5, characterized in that: The impeller includes a rear cover plate, which extends perpendicularly to the axial direction of the rotating shaft, and one end of each of the blades in the height direction is connected to the rear cover plate. The second line groove includes a first section, a second section and a third section. The first section is provided on the blade surface and extends along the profile direction of the impeller, and the first section is connected to the plurality of assembly grooves. The second section extends perpendicular to the profile direction of the impeller, one end of the second section is connected to the first section, the other end of the second section passes through the rear cover plate and is connected to one end of the third section, and the other end of the third section extends radially along the rear cover plate to the first line groove.

7. The vane pump blade surface pressure measurement equipment according to claim 6, characterized in that: The second wire groove is filled with a filler to make the surface of the blade and the surface of the rear cover smooth and continuous; And / or, the first wire groove is filled with a filling body to make the circumference of the rotating shaft smooth and continuous.

8. The vane pump blade surface pressure measurement equipment according to claim 3, characterized in that: An elastic sealing body is provided in the assembly groove, and the elastic sealing body is located between the blade surface filled with the blade and the pressure sensor.

9. The vane pump blade surface pressure measurement equipment according to claim 3, characterized in that: The plurality of assembly grooves are spaced apart along the height direction of the blade to form a plurality of groove groups, each of the groove groups extends along the same blade profile, and any two adjacent assembly grooves in each of the groove groups are spaced apart at the same axial angle.

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