Window parameterization design method and system for multi-arc symmetric cylinder body of low-power-consumption inner curve hydraulic motor

Abstract

The invention discloses a low-power-consumption inner curve hydraulic motor multi-arc symmetrical type cylinder window parameterization design method and system. An inner curve hydraulic motor cylinder window structure is defined in a parameterization mode through theoretical analysis, structural design and parameter preliminary selection, performance evaluation and comparative analysis and other methods. The shape of a cylinder window is designed in a parametric mode to be of a multi-arc symmetrical structure, specific parameter values of the multi-arc symmetrical structure are selected, a flow distribution pair oil film lubrication simulation model is built in combination with a flow distribution window of a flow distribution disc, and flow distribution pair total power losses corresponding to different structure parameters of the multi-arc symmetrical cylinder window of the inner curve hydraulic motor are calculated; the power loss comprises leakage power loss, viscosity power loss and friction power loss, and the optimal motor cylinder window structure meeting the design target is selected by taking the minimum total power loss of the flow distribution pair as the design target. The invention provides a new method for the parameterization design of the cylinder window of the inner curve hydraulic motor, and the total power loss of a flow distribution pair can be reduced, so that the total efficiency of the inner curve hydraulic motor is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of inner curve hydraulic motors, and particularly relates to a parametric design method and system for multi-arc symmetric cylinder block windows of a low-power inner curve hydraulic motor. Background Art

[0002] An inner curve hydraulic motor is a low-speed and high-torque hydraulic motor, which is widely used in large rotary drive systems such as dredgers and shield machines due to its extremely high output torque. However, under heavy load conditions with alternating high and low pressure switching, the motor has problems such as serious power loss, which directly affects the efficiency and service life of the motor. Among them, the distribution pair has the function of continuously completing high and low pressure switching during the rotation of the cylinder block. The high power loss limits the performance and application range of the motor. Therefore, it is of great significance to design and optimize the cylinder block window in the distribution pair. By reducing the power loss of the distribution pair, the efficiency and reliability of the hydraulic system can be further improved.

[0003] To reduce the power loss of the distribution pair, the present invention proposes a parametric design method and system for multi-arc symmetric cylinder block windows of a low-power inner curve hydraulic motor, so that the inner curve hydraulic motor can meet the requirements of different application fields. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art. The present invention proposes a parametric design method and system for multi-arc symmetric cylinder block windows of a low-power inner curve hydraulic motor. By parameterizing the central arc segment of the cylinder block window and the center and radius corresponding to each arc segment, the power loss during the distribution process is reduced, and the use efficiency of the inner curve hydraulic motor is improved.

[0005] The purpose of the present invention is achieved through the following technical solutions. A parametric design method for multi-arc symmetric cylinder block windows of a low-power inner curve hydraulic motor includes the following steps: S1: Design the cylinder block window of the inner curve hydraulic motor as a multi-arc symmetric structure, which is a left-right symmetric closed curve composed of 2 central arc segments and 2 i other arc segments, where i ≥3, and the boundaries of each arc segment should be located within the sealing band position of the distribution pair and the geometric constraints of the shape of the distribution disc window, and a multi-arc symmetric cylinder block window is designed; S2: Establish an oil film lubrication simulation model for the motor distribution pair corresponding to different cylinder block window structures, simulate the lubrication load-bearing characteristics of the distribution pair at different rotation angles during the rotation of the cylinder block based on the working principle of the inner curve hydraulic motor, theoretically calculate the leakage power loss, viscous power loss and friction power loss of the distribution pair corresponding to different cylinder block windows, and then obtain the total power loss of the motor distribution pair under different working conditions; S3: With the goal of minimizing the total power loss of the motor flow distribution pair, the optimal cylinder block window structure parameters and geometric model are obtained through optimization, and then it is further determined whether the obtained total power loss meets the design goal. If the actual required power consumption is smaller, the number of arc segments and the size of the arc segments need to be optimized within the design constraints, and steps S1 - S3 are repeated until the total power loss of the flow distribution pair meets the design requirements, thereby realizing the low-power design of the internal curve hydraulic motor.

[0006] Further, in step S1, the central arc segment is a circular arc with the center O and the radius of r , and the two central arc segments are symmetrically distributed on the upper and lower sides of the center O. The center O is the center of the cylinder block window and is on the circle with the center of the cylinder block as the origin and the radius of R .

[0007] Further, in step S1, the two i other arc segments are symmetrically distributed arc segments. The symmetry line is the connection line between the center of the cylinder block window and the center of the cylinder block. Define the unilateral arc segment as the i th arc segment with the center O r i and the radius of i . Its center O i is on the circle with the center of the cylinder block as the origin and the radius of R i , and the distance between the center O i and the symmetry line is L i .

[0008] Further, in step S1, the geometric constraints of the seal band position of the flow distribution pair and the shape of the port plate window are as follows: the cylinder block window cannot exceed the inner and outer seal bands, and the cylinder block window cannot connect the high-pressure and low-pressure windows on both sides of the port plate at the same time.

[0009] Further, in step S2, the oil film lubrication simulation model of the flow distribution pair is established based on the combination of numbers and shapes. The numbers are the oil film pressure distribution equation, the force balance equation, the fluid flow equation, the flow calculation equation, and the power calculation equation, and the shape is the port distribution structure shape of the flow distribution pair. The combination of numbers and shapes completes the numerical calculation through the node method to obtain the total power loss of the flow distribution pair.

[0010] On the other hand, the present invention also provides a parametric design system for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor. The system includes a parametric design module, a total power loss calculation module, and a parameter optimization module; The parametric design module is used to construct a multi-arc symmetric cylinder block window structure, which is a left-right symmetric closed curve composed of two central arc segments and two i other arc segments, where i≥3, determine the range of structural parameter selection based on the geometric constraints of the seal band position of the flow distribution pair and the shape of the flow distribution plate window; The total power loss calculation module is used to establish an oil film lubrication simulation model of the motor flow distribution pair corresponding to different cylinder block window structures, simulate the lubrication load-bearing characteristics of the corresponding flow distribution pair at different rotation angles during the rotation of the cylinder block based on the working principle of the internal curve hydraulic motor, theoretically calculate the leakage power loss, viscous power loss and friction power loss of the flow distribution pair corresponding to different cylinder block windows, and then obtain the total power loss of the motor flow distribution pair under different working conditions; The parameter optimization module is used to aim at minimizing the total power loss of the motor flow distribution pair, obtain the optimal cylinder block window structure parameters and geometric model through optimization, judge whether the obtained total power loss meets the design goal. If not, it is necessary to optimize the number and size of the arc segments within the design constraints until the total power loss of the flow distribution pair meets the design requirements, so as to realize the low-power design of the internal curve hydraulic motor.

[0011] Further, in the parametric design module, the central arc segment is a circular arc with the center O and the radius of r . The two central arc segments are symmetrically distributed on the upper and lower sides of the center O. The center O is the center of the cylinder block window and is on the circle with the cylinder block center as the origin and the radius of R .

[0012] Further, the two i other arc segments in the parametric design module are symmetrically distributed arc segments. The symmetry line is the connection line between the cylinder block window center and the cylinder block center. Define the unilateral arc segment as the arc segment with the center O i and the radius of r i . Its center O i is on the circle with the cylinder block center as the origin and the radius of i R . The distance between the center O i and the symmetry line is i L i .

[0013] Further, the geometric constraints of the seal band position of the flow distribution pair and the shape of the flow distribution plate window in the parametric design module are: the cylinder block window cannot exceed the inner and outer seal bands, and the cylinder block window cannot simultaneously connect the high-pressure and low-pressure windows on both sides of the flow distribution plate.

[0014] Further, in the total power loss calculation module, the oil film lubrication simulation model of the flow distribution pair is established based on the combination of numbers and shapes. The numbers are the oil film pressure distribution equation, force balance equation, fluid flow equation, flow rate calculation equation and power calculation equation. The shape is the window distribution structure shape of the flow distribution pair. The combination of numbers and shapes completes the numerical calculation through the node method to obtain the total power loss of the flow distribution pair.

[0015] The beneficial effects of the present invention are as follows: The present invention provides a parametric design method for multi-arc symmetric cylinder block windows of a low-power inner curve hydraulic motor. Through the multi-arc structure design, the frictional torque and total power loss of the flow distribution pair can be further reduced, and especially the performance of the inner curve hydraulic motor under high-speed and heavy-load conditions can be improved. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for description in the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a flow chart of a parametric design method for multi-arc symmetric cylinder block windows of a low-power inner curve hydraulic motor provided by the present invention.

[0018] Figure 2 It is a schematic structural diagram of the flow distribution pair of the inner curve hydraulic motor.

[0019] Figure 3 It is a schematic structural diagram of the cylinder block of the inner curve hydraulic motor.

[0020] Figure 4 It is a schematic diagram of any shape of the cylinder block window of the design object and its corresponding design parameters.

[0021] Figure 5 It is a comparison of the total power loss between the parametrically designed cylinder block window and the original window under a certain specific embodiment.

[0022] Figure 6 It is a parametric design system for multi-arc symmetric cylinder block windows of a low-power inner curve hydraulic motor.

[0023] In the drawings, the reference numerals are: 1. valve plate; 2. cylinder block; 2.1 high-pressure window of the cylinder block; 2.2 low-pressure window of the cylinder block. Detailed Embodiments

[0024] The following will elaborate on the preferred embodiments of the present invention in conjunction with the drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0025] The following further describes the content of the present invention with reference to the drawings. The present invention provides a parametric design method for multi-arc symmetric cylinder block windows of a low-power inner curve hydraulic motor, as Figure 1 shown, including the following steps: S1: Parametrically define the cylinder block window of the inner curve hydraulic motor as a multi-arc symmetric structure, which is a left-right symmetric closed curve composed of 2 central arc segments and 2 i other arc segments ( i ≥3). The boundaries of each arc segment should be located within the sealing band position of the flow distribution pair and the geometric constraints of the flow distribution plate window shape, and a multi-arc symmetric cylinder block window is designed. In a specific example, the optimized flow distribution pair structure of the inner curve hydraulic motor of the present invention is as Figure 2 shown, the cylinder block and its high and low pressure windows are as Figure 3 shown, and a three-segment circular arc cylinder block window structure is designed in the specific embodiment as Figure 4 shown. The central arc segment is a circular arc with the center at O and the radius of r . The 2 central arc segments are symmetrically distributed on the upper and lower sides of the center O, and the center O is the center of the cylinder block window and is on the circle with the center of the cylinder block as the origin and the radius of R . The 2 i other arc segments ( i ≥3) are left-right symmetrically distributed arc segments, and the symmetry line is the connection line between the center O of the cylinder block window and the center of the cylinder block. Define the unilateral arc segment as the i th arc segment with the center at O r i and the radius of i . The center O i is on the circle with the center of the cylinder block as the origin and the radius of R i . The distance between the center O i and the symmetry line is L i .

[0026] Based on the geometric constraints of the sealing band position of the flow distribution pair and the shape of the flow distribution plate window, that is, the cylinder block window cannot exceed the inner and outer sealing bands and the cylinder block window cannot simultaneously connect the high and low pressure windows on both sides of the flow distribution plate, design a cylinder block window structure parameter on a certain motor cylinder block as: i =3, R =38 mm, R 1=36 mm, R 2= R =38 mm, R 3=40 mm, r =4.5 mm, r 1=2.5 mm, r 2=4.5 mm, r 3=2.5 mm, L 1=2 mm, L 2=0, L 3=2.22 mm.

[0027] S2: Establish a simulation model for the oil film lubrication of the motor distribution pair corresponding to different cylinder block window structures. Based on the working principle of the internal curve hydraulic motor, simulate the lubrication load-bearing characteristics of the distribution pair at different rotation angles during the rotation of the cylinder block, theoretically calculate the leakage power loss, viscous power loss, and frictional power loss of the distribution pair corresponding to different cylinder block windows, and then obtain the total power loss of the motor distribution pair under different working conditions; Establish the oil film lubrication simulation model of the distribution pair based on the combination of numbers and shapes. The numbers are the oil film pressure distribution equation, force balance equation, fluid flow equation, flow calculation equation, and power calculation equation, and the shape is the distribution structure shape of the distribution pair window. The combination of numbers and shapes completes the numerical calculation through the node method to obtain the total power loss of the distribution pair.

[0028] In a specific example, establish the oil film lubrication simulation model of the distribution pair based on the combination of numbers and shapes. The numbers are the oil film pressure distribution equation, force balance equation, fluid flow equation, flow calculation equation, and power calculation equation, and the shape is the distribution structure shape of the distribution pair window. The combination of numbers and shapes completes the numerical calculation through the node method to obtain the total power loss of the distribution pair. Through numerical calculation, the total power loss of the distribution pair under the working conditions of a pressure of 35 MPa and a rotational speed of 100 r / min is as Figure 5 shown. It can be seen that the power loss of the distribution pair corresponding to the cylinder block window designed with the multi-arc symmetric structure is significantly lower than that of the distribution pair corresponding to the original structure.

[0029] S3: With the goal of minimizing the total power loss of the motor distribution pair, optimize to obtain the optimal cylinder block window structure parameters and geometric model, and further judge whether the obtained total power loss meets the design goal. If the actual required power consumption is smaller, it is necessary to optimize the number of arc segments and the size of the arc segments within the design constraints, and repeat steps S1 - S3 until the total power loss of the distribution pair meets the design requirements, so as to achieve the low-power design of the internal curve hydraulic motor.

[0030] On the other hand, the present invention also provides a parametric design system for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor. The system includes a parametric design module, a total power loss calculation module, and a parameter optimization module, as Figure 6 shown.

[0031] The parametric design module is used to construct a multi-arc symmetric cylinder block window structure. Based on the geometric constraints of the sealing belt position of the distribution pair and the shape of the distribution plate window, the cylinder block window cannot exceed the inner and outer sealing belts, and the cylinder block window cannot simultaneously connect the high-pressure and low-pressure windows on both sides of the distribution plate, and then determine the range of structural parameter selection; the multi-arc symmetric cylinder block window structure is a left-right symmetric closed curve composed of 2 central arc segments and 2 i other arc segments, where i ≥3; the central arc segment is a circle with the center O and the radius rarc, with two central arc segments symmetrically distributed on the upper and lower sides of the center O of the circle. The center O is the center of the cylinder block window and lies on a circle with the center of the cylinder block as the origin and a radius of R 2 i The other two arc segments are symmetrically distributed left and right. The symmetry line is the connection line between the center of the cylinder block window and the center of the cylinder block. Define a single-side arc segment as an arc segment with the center at O i and a radius of r i The i arc segment. Its center O i lies on a circle with the center of the cylinder block as the origin and a radius of R i The distance between the center O i and the symmetry line is L i .

[0032] The total power loss calculation module is used to establish a corresponding oil film lubrication simulation model for the flow distribution pair, and calculate the total power loss of the flow distribution pair through a combination of numbers and shapes. The numbers are the oil film pressure distribution equation, force balance equation, fluid flow equation, flow rate calculation equation and power calculation equation, and the shape is the shape of the flow distribution pair window distribution structure. Based on the working principle of the internal curve hydraulic motor, simulate the lubrication load-bearing characteristics of the corresponding flow distribution pair at different rotation angles when the cylinder block rotates, theoretically calculate the leakage power loss, viscous power loss and friction power loss of the flow distribution pair corresponding to different cylinder block windows, and complete numerical calculation through the node method based on the combination of numbers and shapes to obtain the total power loss of the motor flow distribution pair under different working conditions.

[0033] The parameter optimization module aims to minimize the total power loss of the motor flow distribution pair, optimize to obtain the optimal cylinder block window structure parameters and geometric model, and judge whether the obtained total power loss meets the design goal. If not, it is necessary to optimize the number and size of the arc segments within the design constraints until the total power loss of the flow distribution pair meets the design requirements, so as to realize the low-power design of the internal curve hydraulic motor.

[0034] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A parametric design method for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor, characterized in that, The method includes the following steps: S1: Design the cylinder block window of the inner curve hydraulic motor as a multi-arc symmetric structure, which is a left-right symmetric closed curve composed of 2 central arc segments and 2 i other arc segments, where i ≥3, and the boundaries of each arc segment should be located within the sealing band position of the flow distribution pair and the geometric constraint range of the shape of the flow distribution plate window, and a multi-arc symmetric cylinder block window is designed; S2: Establish a motor port plate pair oil film lubrication simulation model corresponding to different cylinder block window structures. Based on the working principle of the internal curve hydraulic motor, simulate the lubrication load-bearing characteristics of the corresponding port plate pair at different rotation angles during cylinder block rotation. Theoretically calculate the leakage power loss, viscous power loss, and friction power loss of the port plate pair corresponding to different cylinder block windows, and then obtain the total power loss of the motor port plate pair under different working conditions. S3: With the goal of minimizing the total power loss of the motor port plate pair, optimize to obtain the optimal cylinder block window structure parameters and geometric model. Further determine whether the obtained total power loss meets the design goal. If it does not meet the goal, it is necessary to optimize the number of arc segments and the size of the arc segments within the design constraints, and repeat steps S1 - S3 until the total power loss of the port plate pair meets the design requirements, thereby achieving the low-power design of the internal curve hydraulic motor.

2. A parametric design method for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor according to claim 1, characterized in that, In step S1, the central arc segment is an arc with the center at O and a radius of r . Two central arc segments are located on the upper and lower sides of the center O and are symmetrically distributed. The center O is the center of the cylinder block window and lies on a circle with the center of the cylinder block as the origin and a radius of R .

3. A parametric design method for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor according to claim 1, characterized in that, In step S1, the 2 i other arc segments are symmetrically distributed arc segments, and the symmetry line is the connection line between the center of the cylinder block window and the center of the cylinder block. Define the unilateral arc segment as the i -th arc segment with the center of the circle being O r i and the radius being i . Its center of the circle O i is on the circle with the center of the cylinder block as the origin and the radius being R i . The distance between the center of the circle O i and the symmetry line is L i .

4. A parametric design method for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor according to claim 1, characterized in that, In step S1, the geometric constraints on the seal band position of the port plate pair and the shape of the port plate window are as follows: The cylinder block window cannot exceed the inner and outer seal bands, and the cylinder block window cannot simultaneously connect the high-pressure and low-pressure windows on both sides of the port plate.

5. A parametric design method for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor according to claim 1, characterized in that, In step S2, establish the oil film lubrication simulation model of the port plate pair based on the combination of numbers and shapes. The numbers are the oil film pressure distribution equation, force balance equation, fluid flow equation, flow calculation equation, and power calculation equation, and the shape is the port plate pair window distribution structure shape. The combination of numbers and shapes completes the numerical calculation through the node method to obtain the total power loss of the port plate pair.

6. A parametric design system for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor, characterized in that, The system includes a parametric design module, a total power loss calculation module, and a parameter optimization module; The parametric design module is used to construct a multi-arc symmetric cylinder block window structure, which is a left-right symmetric closed curve composed of 2 central arc segments and 2 i other arc segments, where i ≥3, and the selection range of structure parameters is determined based on the geometric constraints of the sealing band position of the flow distribution pair and the window shape of the flow distribution plate; The total power loss calculation module is used to establish a motor port plate pair oil film lubrication simulation model corresponding to different cylinder block window structures. Based on the working principle of the internal curve hydraulic motor, simulate the lubrication load-bearing characteristics of the corresponding port plate pair at different rotation angles during cylinder block rotation. Theoretically calculate the leakage power loss, viscous power loss, and friction power loss of the port plate pair corresponding to different cylinder block windows, and then obtain the total power loss of the motor port plate pair under different working conditions. The parameter optimization module is used to take the minimum total power loss of the motor port plate pair as the goal, optimize to obtain the optimal cylinder block window structure parameters and geometric model, determine whether the obtained total power loss meets the design goal. If it does not meet the goal, it is necessary to optimize the number of arc segments and the size of the arc segments within the design constraints until the total power loss of the port plate pair meets the design requirements, thereby achieving the low-power design of the internal curve hydraulic motor.

7. A parametric design method for the multi-arc symmetric cylinder block window of a low-power inner curve hydraulic motor according to claim 1, characterized in that The central arc segment described in the parametric design module is an arc with the center at O and a radius of r . The two central arc segments are located on the upper and lower sides of the center O and are symmetrically distributed. The center O is the center of the cylinder block window and lies on a circle with the center of the cylinder block as the origin and a radius of R .

8. A parametric design method for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor according to claim 1, characterized in that, The 2 described in the parametric design module i Other two arc segments are symmetrically distributed left and right. The symmetry line is the connection line between the center of the cylinder block window and the center of the cylinder block. Define the unilateral arc segment as the i th arc segment with the center of the circle being O r i and the radius being i . Its center of the circle O i is on the circle with the center of the cylinder block as the origin and the radius being R i . The distance between the center of the circle O i and the symmetry line is L i .

9. A parametric design method for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor according to claim 1, characterized in that In the parametric design module, the geometric constraints on the seal band position of the port plate pair and the shape of the port plate window are as follows: The cylinder block window cannot exceed the inner and outer seal bands, and the cylinder block window cannot simultaneously connect the high-pressure and low-pressure windows on both sides of the port plate.

10. A parametric design method for the multi-arc symmetric cylinder block window of a low-power internal curve hydraulic motor according to claim 1, characterized in that, In the total power loss calculation module, establish the oil film lubrication simulation model of the port plate pair based on the combination of numbers and shapes. The numbers are the oil film pressure distribution equation, force balance equation, fluid flow equation, flow calculation equation, and power calculation equation, and the shape is the port plate pair window distribution structure shape. The combination of numbers and shapes completes the numerical calculation through the node method to obtain the total power loss of the port plate pair.

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