Sealing performance calculation method and device, heating and ventilation equipment and storage medium

Abstract

The invention provides a sealing performance calculation method and device of an oil way sealing structure, heating and ventilation equipment and a computer storage medium. The oil way sealing structure comprises an oil slinger, a spiral sealing piece and a comb tooth sealing piece, and the sealing performance calculation method comprises the steps that attribute parameters of the oil way sealing structure and physical property parameters of lubricating oil are obtained, the attribute parameters comprise physical property parameters of lubricating oil, attribute parameters of an oil slinger, attribute parameters of a spiral sealing element and attribute parameters of a comb tooth sealing element; the inlet pressure of the spiral sealing element is solved according to the physical property parameters, the attribute parameters of the oil slinger and the preset leakage rate; calculating the outlet pressure of the spiral sealing element according to the inlet pressure and the attribute parameters of the spiral sealing element; the leakage volume flow of the comb tooth sealing element is calculated according to the outlet pressure and the attribute parameters of the comb tooth sealing element; and the sealing performance result of the oil way sealing structure is determined according to the leakage volume flow and the preset leakage amount. In this way, evaluation of the sealing performance of the oil way sealing structure is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly relates to a method and device for calculating the sealing performance of an oil circuit sealing structure, a heating, ventilation and air conditioning (HVAC) device, and a storage medium. Background Art

[0002] Currently, in a refrigeration or heat pump centrifugal compressor, it is necessary to ensure that the lubricating oil can smoothly return to the oil tank. If the lubricating oil leaves the oil system and enters the refrigerant flow path or the motor, it will cause the loss of lubricating oil, that is, oil leakage. The oil leakage problem will not only lead to a deterioration in the lubrication effect of bearings or gears, but also increase the oil content in the refrigerant, thereby reducing the heat transfer coefficient of the heat exchanger and affecting the energy efficiency of the entire unit. The oil seal device is a key structure to prevent oil leakage in the compressor. Its function is to prevent the lubricating oil in the oil system from entering the motor cavity or the disc cavity. The structure of the oil seal device has an important impact on the sealing performance. Therefore, how to evaluate the sealing performance of the structure of the oil seal device has become a technical problem to be solved urgently at present. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a method for calculating the sealing performance of an oil circuit sealing structure, a device for calculating the sealing performance, a storage medium, and a non-volatile computer-readable storage medium.

[0004] The method for calculating the sealing performance of the oil circuit sealing structure provided by the embodiment of the present invention, the oil circuit sealing structure includes an oil slinger, a spiral seal, and a labyrinth seal. The method for calculating the sealing performance includes:

[0005] Obtain the attribute parameters of the oil circuit sealing structure and the physical property parameters of the lubricating oil. The attribute parameters include the attribute parameters of the oil slinger, the attribute parameters of the spiral seal, and the attribute parameters of the labyrinth seal;

[0006] Solve for the inlet pressure of the spiral seal according to the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and a preset leakage amount;

[0007] Calculate the outlet pressure of the spiral seal according to the inlet pressure and the attribute parameters of the spiral seal;

[0008] Calculate the leakage volume flow rate of the labyrinth seal according to the outlet pressure and the attribute parameters of the labyrinth seal; and

[0009] Determine the sealing performance result of the oil circuit sealing structure according to the leakage volume flow rate and the preset leakage amount.

[0010] In some embodiments, determining the sealing performance result of the oil circuit sealing structure according to the leakage volume flow rate and the preset leakage amount includes:

[0011] Compare the relative error between the leakage volume flow rate and the preset leakage amount;

[0012] When the relative error is less than a preset threshold, generate the sealing performance result according to the leakage volume flow rate; or

[0013] When the relative error is greater than or equal to the preset threshold, update the preset leakage amount.

[0014] In some embodiments, the physical property parameters of the lubricating oil include the density and viscosity of the lubricating oil, and the attribute parameters of the oil slinger include the diameter of the oil slinger, the axial width between the oil slinger and the spiral seal, the rotational speed, and the pressure of the outermost bearing cavity; solving for the inlet pressure of the spiral seal according to the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and the preset leakage amount includes:

[0015] Construct a differential equation of fluid motion of the lubricating oil on the oil slinger;

[0016] Solve the differential equation of fluid motion with the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and the preset leakage amount to obtain the inlet pressure of the spiral seal.

[0017] In some embodiments, the calculation expression of the differential equation of fluid motion includes:

[0018]

[0019] wherein, V r and V θ are the radial and circumferential components of the absolute velocity of the lubricating oil, Q V is the preset leakage amount of the lubricating oil, ω is the rotational speed of the oil slinger, ρ is the density of the lubricating oil, r is the local diameter of the oil slinger, π is the pi, w is the axial width between the oil slinger and the spiral seal, and μ is the viscosity of the lubricating oil.

[0020] In some embodiments, the attribute parameters of the spiral seal include the linear velocity, spiral lift angle, thread tooth height, tooth tip clearance, thread tooth width, thread groove width, and thread length of the spiral seal; calculating the outlet pressure of the spiral seal according to the inlet pressure and the attribute parameters of the spiral seal includes:

[0021] Construct an algebraic equation set of the lubricating oil on the spiral seal;

[0022] Input the inlet pressure and the attribute parameters of the spiral seal into the algebraic equation set to calculate the outlet pressure.

[0023] In some embodiments, the calculation expression of the algebraic equation set includes:

[0024]

[0025]

[0026] Q V = Q X1 + Q X2 - Q p

[0027] wherein, Q X1 is the leakage flow rate of the spiral groove in the spiral seal, Q X2 is the leakage flow rate through the clearance in the spiral seal, Q p is the pumping flow rate in the spiral seal, Q V is the volume flow rate of lubricating oil leakage, V is the linear velocity of the spiral shaft in the spiral seal, α is the helix angle of the spiral seal, h is the tooth height of the thread of the spiral seal, c is the tip clearance of the tooth of the spiral seal, a is the tooth width of the thread of the spiral seal, b is the groove width of the thread of the spiral seal, L is the thread length of the spiral seal, P1 is the inlet pressure of the spiral seal, and P2 is the outlet pressure of the spiral seal.

[0028] In some embodiments, the attribute parameters of the comb seal include the leakage area of the comb seal, the comb radius, the number of sealing teeth, and the pressure on the motor chamber side. Calculating the leakage volume flow rate of the comb seal according to the outlet pressure and the attribute parameters of the comb seal includes:

[0029] Constructing a flow leakage equation for lubricating oil on the comb seal;

[0030] Inputting the outlet pressure and the attribute parameters of the comb seal into the flow leakage equation to calculate the leakage volume flow rate.

[0031] In some embodiments, the flow leakage equation may include one of the Martin equation or the Egli equation.

[0032] A sealing performance calculation device for an oil circuit sealing structure according to an embodiment of the present application. The oil circuit sealing structure includes an oil slinger, a spiral seal, and a comb seal. The sealing performance calculation device includes:

[0033] An acquisition module for acquiring the attribute parameters of the oil circuit sealing structure and the physical property parameters of the lubricating oil. The attribute parameters include the attribute parameters of the oil slinger, the attribute parameters of the spiral seal, and the attribute parameters of the comb seal;

[0034] A solution module for solving the inlet pressure of the spiral seal according to the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and a preset leakage amount;

[0035] A first calculation module, configured to calculate the outlet pressure of the spiral seal according to the inlet pressure and the attribute parameters of the spiral seal;

[0036] A second calculation module, configured to calculate the leakage volume flow rate of the comb seal according to the outlet pressure and the attribute parameters of the comb seal; and

[0037] A determination module, configured to determine the sealing performance result of the oil circuit sealing structure according to the leakage volume flow rate and the preset leakage amount.

[0038] The heating and ventilation equipment according to the embodiment of the present application includes a processor and a memory. The memory stores a computer program. When the computer program is executed by the processor, the processor implements the sealing performance calculation method described above.

[0039] The non-volatile computer-readable storage medium according to the embodiment of the present application. The readable storage medium contains a computer program. When the computer program is executed by the processor, the processor implements the sealing performance calculation method described above.

[0040] In the sealing performance calculation method, sealing performance calculation device, heating and ventilation equipment, and storage medium of the oil circuit sealing structure according to the embodiment of the present application, by obtaining the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, the attribute parameters of the spiral seal, and the attribute parameters of the comb seal, and solving the inlet pressure caused by the lubricating oil on the spiral seal according to the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and the preset leakage amount, and then calculating the outlet pressure caused by the lubricating oil on the outlet of the spiral seal according to the inlet pressure and the attribute parameters of the spiral seal. Since the outlet of the spiral seal is connected to the inlet of the comb seal, therefore, the outlet pressure of the spiral seal is equal to the inlet pressure of the comb seal. Furthermore, then calculate the leakage volume flow rate of the comb seal according to the outlet pressure of the spiral seal and the attribute parameters of the comb seal. Finally, the sealing performance result of the oil circuit sealing structure can be determined according to the leakage volume flow rate and the preset leakage amount. In this way, the evaluation of the sealing performance of the oil circuit sealing structure is realized, and moreover, since the sealing performance of the sealing structure is obtained by solving according to the attribute parameters of the oil circuit sealing structure, the physical property parameters of the lubricating oil, and the set preset leakage amount, the calculation is relatively simple, the calculation amount is small, and the efficiency is high.

[0041] The additional aspects and advantages of the embodiments of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. Description of the Drawings

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0043] Figure 1 is a schematic flowchart of a method for calculating the sealing performance of certain embodiments of the present invention;

[0044] Figure 2 is a schematic block diagram of a device for calculating the sealing performance of certain embodiments of the present invention;

[0045] Figure 3 is a schematic structural diagram of an oil circuit sealing structure of certain embodiments of the present invention;

[0046] Figures 4 - 7 is a schematic flowchart of a method for calculating the sealing performance of certain embodiments of the present invention. Detailed Embodiments

[0047] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the said embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions 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 a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. At the same time, the descriptions referring to terms such as "first", "second", etc. are intended to distinguish between similar or like operations. There may be a logical relationship before and after between "first" and "second" in some embodiments, and there may not necessarily be a logical or before-and-after relationship in some embodiments, which needs to be determined according to the actual embodiments and should not be determined only by the literal meaning.

[0048] Any process or method description shown in the flowchart or described in other ways herein can be understood as representing a module, segment, or part of code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions can be executed in a manner that is not necessarily shown or discussed in the order, including in a substantially simultaneous manner according to the involved functions or in a reverse order, which should be understood by those skilled in the technical field of the embodiments of the present application.

[0049] Please refer to Figure 1, an embodiment of the present application provides a method for calculating the sealing performance of an oil circuit sealing structure. The oil circuit sealing structure includes an oil slinger, a spiral seal, and a labyrinth seal. The method for calculating the sealing performance includes:

[0050] 01. Obtain the attribute parameters of the oil circuit sealing structure and the physical property parameters of the lubricating oil. The attribute parameters include the attribute parameters of the oil slinger, the attribute parameters of the spiral seal, and the attribute parameters of the labyrinth seal;

[0051] 02. Solve for the inlet pressure of the spiral seal according to the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and a preset leakage amount;

[0052] 03. Calculate the outlet pressure of the spiral seal according to the inlet pressure and the attribute parameters of the spiral seal;

[0053] 04. Calculate the leakage volume flow rate of the labyrinth seal according to the outlet pressure and the attribute parameters of the labyrinth seal; and

[0054] 05. Determine the sealing performance result of the oil circuit sealing structure according to the leakage volume flow rate and the preset leakage amount.

[0055] Please refer to Figure 2 , an embodiment of the present application provides a device 10 for calculating the sealing performance of an oil circuit sealing structure. The device 10 for calculating the sealing performance includes an acquisition module 11, a solution module 12, a first calculation module 13, a second calculation module 14, and a determination module 15. Step 01 can be implemented by the acquisition module 11, step 02 can be implemented by the solution module 12, step 03 can be implemented by the first calculation module 13, step 04 can be implemented by the second calculation module 14, and step 04 can be implemented by the determination module 15.

[0056] Or rather, the acquisition module 11 can be used to obtain the attribute parameters of the oil circuit sealing structure and the physical property parameters of the lubricating oil. The attribute parameters include the attribute parameters of the oil slinger, the attribute parameters of the spiral seal, and the attribute parameters of the labyrinth seal. The solution module 12 can be used to solve for the inlet pressure of the spiral seal according to the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and a preset leakage amount. The first calculation module 13 can be used to calculate the outlet pressure of the spiral seal according to the inlet pressure and the attribute parameters of the spiral seal. The second calculation module 14 can be used to calculate the leakage volume flow rate of the labyrinth seal according to the outlet pressure and the attribute parameters of the labyrinth seal. The determination module 15 can be used to determine the sealing performance result of the oil circuit sealing structure according to the leakage volume flow rate and the preset leakage amount.

[0057] An embodiment of the present application also provides a heating, ventilation and air conditioning (HVAC) device. The HVAC device includes a processor and a memory. The memory stores a computer program. When the computer program is executed by the processor, a sealing performance calculation method is implemented by the processor. That is to say, the processor can be used to obtain the attribute parameters of the oil circuit sealing structure and the physical property parameters of the lubricating oil. The attribute parameters include the attribute parameters of the oil slinger, the attribute parameters of the spiral seal, and the attribute parameters of the labyrinth seal. The inlet pressure of the spiral seal is solved according to the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and the preset leakage amount. The outlet pressure of the spiral seal is calculated according to the inlet pressure and the attribute parameters of the spiral seal. The leakage volume flow rate of the labyrinth seal is calculated according to the outlet pressure and the attribute parameters of the labyrinth seal. And the sealing performance result of the oil circuit sealing structure is determined according to the leakage volume flow rate and the preset leakage amount.

[0058] In the sealing performance calculation method, the sealing performance calculation device 10, and the HVAC device according to the embodiment of the present application, by obtaining the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, the attribute parameters of the spiral seal, and the attribute parameters of the labyrinth seal, and solving the inlet pressure caused by the lubricating oil on the spiral seal according to the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and the preset leakage amount, and then calculating the outlet pressure caused by the lubricating oil on the outlet of the spiral seal according to the inlet pressure and the attribute parameters of the spiral seal. Since the outlet of the spiral seal is connected to the inlet of the labyrinth seal, the outlet pressure of the spiral seal is equal to the inlet pressure of the labyrinth seal. Furthermore, the leakage volume flow rate of the labyrinth seal is calculated according to the outlet pressure of the spiral seal and the attribute parameters of the labyrinth seal. Finally, the sealing performance result of the oil circuit sealing structure is determined according to the leakage volume flow rate and the preset leakage amount. In this way, the evaluation of the sealing performance of the oil circuit sealing structure is realized. And since the sealing performance of the oil circuit sealing structure is obtained by solving based on the attribute parameters of the oil circuit sealing structure and the set preset leakage amount, the calculation is relatively simple, the calculation amount is small, and the efficiency is high.

[0059] The HVAC device in this embodiment may include, but is not limited to, air conditioning equipment, air source heat pumps, etc. The HVAC device may include a centrifugal compressor. The centrifugal compressor continuously sucks, compresses, and discharges gas, realizing the continuous compression of the gas, providing the high-pressure gas required by the air conditioning system, and thus ensuring the normal operation of the refrigeration or heating function of the air conditioning system.

[0060] The centrifugal compressor may include a lubricating oil system and the above-mentioned oil circuit sealing structure. Among them, the lubricating oil system mainly consists of a lubricating oil tank, a main oil pump, an auxiliary oil pump, an oil cooler, an oil filter, a high-level oil tank, valves, pipelines, etc. During normal operation, the lubricating oil in the tank is first sucked into the filter. After removing some impurities, it is pressurized by the main oil pump, cooled by the oil cooler, and filtered again by the oil filter. Finally, it enters the main lubricating oil pipe through the regulating valve in a clean state with appropriate temperature and pressure, providing lubrication for each friction pair (such as gears, journal bearings, etc.) in the compressor unit and meeting the sealing requirements of the working volume. The return oil from each bearing converges in the return oil pipe and returns to the tank, completing an oil supply cycle.

[0061] The oil circuit sealing structure is used to prevent oil leakage in the lubricating oil system. The oil circuit sealing structure can prevent lubricating oil from entering the motor cavity or disc cavity in the centrifugal compressor. It can be understood that if the lubricating oil leaves the lubricating oil system and enters the refrigerant flow path or the motor, it will cause oil loss. This is likely to lead to a deterioration in the lubrication effect of bearings or gears. Moreover, it is likely to increase the oil content in the refrigerant, thereby reducing the heat transfer coefficient of the heat exchanger and affecting the energy efficiency of the entire HVAC equipment.

[0062] Please combine Figure 3 , the oil circuit sealing structure may include a compressor main shaft, an oil slinger, a spiral seal, and a labyrinth seal. The oil slinger, spiral seal, and labyrinth seal are arranged in sequence and sleeved on the compressor main shaft to jointly achieve the sealing effect. The oil slinger mainly utilizes the action of centrifugal force. When the shaft rotates, the oil slinger rotates accordingly, radially throwing out the leaked lubricating oil and other liquid media, preventing them from continuing to leak along the shaft. Part of the thrown-out oil will flow back to the storage device such as the tank through channels such as oil return holes, thus achieving sealing. The spiral seal is arranged at an interval from the oil slinger. A spiral groove is machined on the compressor main shaft, and the spiral seal is screwed to the spiral groove of the compressor main shaft. The spiral seal relies on the relative movement between the spiral structure and the compressor main shaft to achieve sealing. The labyrinth seal is composed of a series of labyrinth teeth and concave-convex shoulders that cooperate with the compressor main shaft at the sealing part, forming tiny annular gaps and expansion chambers. When the medium attempts to leak through the gap, a throttling effect will be generated in the gap between the labyrinth teeth, causing the pressure to gradually decrease, thereby reducing the leakage amount of the medium. The spiral seal and the labyrinth seal can be an integrally formed structure.

[0063] Understandably, the oil circuit sealing structure is sealed by a combination of an oil slinger, a spiral seal, and a labyrinth seal. The three sealing methods cooperate with each other to block leakage from different principles and angles. The oil slinger flings out most of the leaked lubricating oil. The spiral seal further prevents the lubricating oil from leaking axially. The labyrinth seal throttles and blocks a small amount of medium that may pass through the first two seals, which can greatly reduce the leakage amount and has a good sealing effect. Moreover, the combination of multiple sealing methods increases the redundancy of the sealing system. Even if one of the sealing methods shows a certain degree of performance degradation due to some reason, the other sealing methods can still ensure the sealing effect to a certain extent, improving the reliability and stability of the entire oil circuit sealing structure. Furthermore, it ensures the lubrication effect of the bearings or gears in the centrifugal compressor and the heat transfer coefficient of the heat exchanger in the HVAC equipment, enhancing the quality of the HVAC equipment.

[0064] The physical property parameters of the lubricating oil may include the density and viscosity of the lubricating oil. The attribute parameters of the oil circuit sealing structure may include geometric parameters (such as the diameter of the oil slinger, the thread groove width of the spiral seal, etc.) and operating conditions parameters (such as the rotational speed of the oil slinger, the pressure on the oil slinger side), etc.

[0065] Solve for the inlet pressure of the spiral seal according to the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and the preset leakage amount;

[0066] Calculate the outlet pressure of the spiral seal according to the inlet pressure and the attribute parameters of the spiral seal;

[0067] Calculate the leakage volume flow rate of the labyrinth seal according to the outlet pressure and the attribute parameters of the labyrinth seal; and

[0068] Determine the sealing performance result of the oil circuit sealing structure according to the leakage volume flow rate and the preset leakage amount.

[0069] Please refer to Figure 4 , in some embodiments, the physical property parameters of the lubricating oil include the density and viscosity of the lubricating oil, and the attribute parameters of the oil slinger include the diameter of the oil slinger, the axial width between the oil slinger and the spiral seal, the rotational speed, and the pressure of the outermost bearing cavity. Step 02 includes:

[0070] 021, construct a differential equation of fluid motion of the lubricating oil on the oil slinger;

[0071] 022, solve the differential equation of fluid motion with the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger, and the preset leakage amount to obtain the inlet pressure of the spiral seal.

[0072] Please further combine with Figure 2, in some embodiments, sub-steps 021-022 can be implemented by the solving module 12. That is, the solving module 12 can be used to construct a differential equation of fluid motion for the lubricating oil on the oil slinger ring, and solve the differential equation of fluid motion with the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger ring, and the preset leakage amount to obtain the inlet pressure of the spiral seal.

[0073] In some embodiments, the processor can be used to construct a differential equation of fluid motion for the lubricating oil on the oil slinger ring, and solve the differential equation of fluid motion with the physical property parameters of the lubricating oil, the attribute parameters of the oil slinger ring, and the preset leakage amount to obtain the inlet pressure of the spiral seal.

[0074] In sub-step 021, the differential equation of fluid motion can be the Navier-Stokes equation; it can be understood that the Navier-Stokes equation is a set of partial differential equations describing the momentum conservation of viscous incompressible fluids. To reduce the difficulty of solving the differential equation of fluid motion, in this embodiment, it is assumed that the axial direction is uniform and the axial pressure gradient can be ignored. The calculation expression of the differential equation of fluid motion includes:

[0075]

[0076] Where V r and V θ are the radial and circumferential components of the absolute velocity of the lubricating oil, Q V is the preset leakage amount of the lubricating oil, ω is the rotational speed of the oil slinger ring, ρ is the density of the lubricating oil, r is the local diameter of the oil slinger ring, π is the pi, w is the axial width between the oil slinger ring and the spiral seal, μ is the viscosity of the lubricating oil, and P is the pressure.

[0077] In step 022, by solving the density, viscosity of the lubricating oil, and the preset leakage amount into the differential equation of fluid motion, the inlet pressure of the spiral seal can be obtained.

[0078] Please refer to Figure 5 , in some embodiments, step 03 includes:

[0079] 031, constructing an algebraic equation set for the lubricating oil on the spiral seal;

[0080] 032, inputting the inlet pressure and the attribute parameters of the spiral seal into the algebraic equation set to calculate the outlet pressure.

[0081] Please further combine Figure 2, in some embodiments, sub-steps 031-032 can be implemented by the first calculation module 13. That is, the first calculation module 13 can be used to construct an algebraic equation system for lubricating oil on the spiral seal, input the inlet pressure and the attribute parameters of the spiral seal into the algebraic equation system, and calculate the outlet pressure.

[0082] In some embodiments, the processor can be used to construct an algebraic equation system for lubricating oil on the spiral seal, input the inlet pressure and the attribute parameters of the spiral seal into the algebraic equation system, and calculate the outlet pressure.

[0083] It should be noted that the attribute parameters of the spiral seal may include the linear velocity of the spiral seal, the spiral lift angle, the thread tooth height, the tip clearance, the thread tooth width, the thread groove width, and the thread length.

[0084] The calculation expression of the algebraic equation system includes:

[0085]

[0086] Q V =Q X1 +Q X2 -Q p

[0087] ……(7)

[0088] Wherein, Q X1 is the leakage flow rate of the spiral groove in the spiral seal, Q X2 is the clearance leakage flow rate in the spiral seal, Q p is the pumping flow rate in the spiral seal, Q V is the lubricating oil leakage volume flow rate, V is the linear velocity of the spiral shaft in the spiral seal, α is the spiral lift angle of the spiral seal, h is the thread tooth height of the spiral seal, c is the tip clearance of the spiral seal, a is the thread tooth width of the spiral seal, b is the thread groove width of the spiral seal, L is the thread length of the spiral seal, P1 is the inlet pressure of the spiral seal, and P2 is the outlet pressure of the spiral seal.

[0089] Substitute the attribute parameters of the spiral seal and the inlet pressure of the spiral seal into the calculation expression of the above algebraic equation system, and the outlet pressure P2 of the spiral seal can be obtained.

[0090] Please refer to Figure 6 , in some embodiments, step 04 includes:

[0091] 041, constructing a flow leakage equation for lubricating oil on the comb seal;

[0092] 042. Input the outlet pressure and the property parameters of the labyrinth seal into the flow leakage equation to calculate the leakage volumetric flow rate.

[0093] Please further combine with Figure 2 , in some embodiments, sub-steps 041 - 042 can be implemented by the second calculation module 14. That is, the second calculation module 14 can be used to construct a flow leakage equation for lubricating oil on the labyrinth seal, input the outlet pressure and the property parameters of the labyrinth seal into the flow leakage equation to calculate the leakage volumetric flow rate.

[0094] In some embodiments, the processor can be used to construct a flow leakage equation for lubricating oil on the labyrinth seal, input the outlet pressure and the property parameters of the labyrinth seal into the flow leakage equation to calculate the leakage volumetric flow rate.

[0095] It should be noted that the property parameters of the labyrinth seal include the leakage area of the labyrinth seal, the labyrinth radius, the number of sealing teeth, and the pressure on the motor chamber side, etc. The flow leakage equation can include one of the Martin equation or the Egli equation.

[0096] For example, in some examples, the flow leakage equation can be the Martin equation, and its calculation expression is:

[0097]

[0098] A = 2πRc……(9)

[0099] Where, Q V2 is the leakage volumetric flow rate of the lubricating oil, A is the leakage area of the labyrinth, R is the labyrinth radius, N is the number of sealing teeth, and P3 is the pressure on the motor chamber side.

[0100] Substitute the above property parameters of the labyrinth seal and the outlet pressure P2 of the spiral seal into the above calculation expression, and the leakage volumetric flow rate Q can be obtained. V2 .

[0101] Please combine with Figure 7 , in some embodiments, step 05 includes:

[0102] 051. Compare the relative error between the leakage volumetric flow rate and the preset leakage amount;

[0103] 052. When the relative error is less than the preset threshold, generate a seal performance result according to the leakage volumetric flow rate; or

[0104] 053. When the relative error is greater than or equal to the preset threshold, update the preset leakage amount.

[0105] Please combine with Figure 6, in some embodiments, steps 051 - 053 can be implemented by the determination module 15, or rather, the determination module 15 can be used to compare the relative error between the leakage volume flow rate and the preset leakage amount; when the relative error is less than the preset threshold, generate a seal performance result based on the leakage volume flow rate; or when the relative error is greater than or equal to the preset threshold, update the preset leakage amount.

[0106] In some embodiments, the processor can be used to compare the relative error between the leakage volume flow rate and the preset leakage amount; when the relative error is less than the preset threshold, generate a seal performance result based on the leakage volume flow rate; or when the relative error is greater than or equal to the preset threshold, update the preset leakage amount.

[0107] Specifically, when the relative error between the leakage volume flow rate and the preset leakage amount is less than the preset threshold, directly use the leakage volume flow rate as the seal performance result of the oil circuit seal structure. When the relative error is greater than or equal to the preset threshold, update the preset leakage amount and use the leakage volume flow rate as the new preset leakage amount, and then repeat steps 02 - 05 to make the relative error between the leakage volume flow rate and the preset leakage amount less than the preset threshold, and then use the leakage volume flow rate as the seal performance result of the oil circuit seal structure.

[0108] The embodiments of the present application also provide a non - volatile computer - readable storage medium, which includes a computer program. When the computer program is executed by a processor, the processor can implement the seal performance calculation method described in any one of the above.

[0109] In the storage medium of the embodiments of the present application, by obtaining the physical property parameters of the lubricating oil, the attribute parameters of the oil - throwing ring, the attribute parameters of the spiral seal, and the attribute parameters of the labyrinth seal, and solving the inlet pressure caused by the lubricating oil on the spiral seal according to the physical property parameters of the lubricating oil, the attribute parameters of the oil - throwing ring, and the preset leakage amount, and then calculating the outlet pressure caused by the lubricating oil on the outlet of the spiral seal according to the inlet pressure and the attribute parameters of the spiral seal. Since the outlet of the spiral seal is connected to the inlet of the labyrinth seal, the outlet pressure of the spiral seal is equal to the inlet pressure of the labyrinth seal. Further, calculate the leakage volume flow rate of the labyrinth seal according to the outlet pressure of the spiral seal and the attribute parameters of the labyrinth seal, and finally determine the seal performance result of the oil circuit seal structure according to the leakage volume flow rate and the preset leakage amount. In this way, the evaluation of the seal performance of the oil circuit seal structure is realized, and since the seal performance of the oil circuit seal structure is obtained by solving based on the attribute parameters of the oil circuit seal structure and the set preset leakage amount, the calculation is relatively simple, with a small amount of calculation and high efficiency.

[0110] The above embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A sealing performance calculation method for an oil circuit sealing structure, characterized in that: The oil circuit sealing structure includes an oil slinger, a spiral seal and a comb seal, and the sealing performance calculation method includes: Acquiring property parameters of the oil circuit sealing structure and physical property parameters of the lubricating oil, wherein the property parameters include property parameters of the oil slinger, property parameters of the spiral seal, and property parameters of the comb seal; Determining the inlet pressure of the spiral seal according to the physical property parameters of the lubricating oil, the property parameters of the oil slinger and the preset leakage amount; Calculating the outlet pressure of the spiral seal according to the inlet pressure and the property parameters of the spiral seal; Calculating the leakage volume flow rate of the comb seal according to the outlet pressure and the property parameters of the comb seal; and The sealing performance result of the oil circuit sealing structure is determined according to the leakage volume flow and the preset leakage amount.

2. The sealing performance calculation method according to claim 1, characterized in that: Determining the sealing performance result of the oil circuit sealing structure according to the leakage volume flow and the preset leakage amount includes: Comparing the relative error between the leakage volume flow rate and the preset leakage amount; In a case where the relative error is less than a preset threshold, generating the sealing performance result according to the leakage volume flow; or When the relative error is greater than or equal to the preset threshold, the preset leakage amount is updated.

3. The sealing performance calculation method according to claim 1, characterized in that: The physical property parameters of the lubricating oil include the density and viscosity of the lubricating oil, and the property parameters of the oil slinger include the diameter of the oil slinger, the axial width between the oil slinger and the spiral seal, the rotation speed, and the outermost bearing cavity pressure; solving the inlet pressure of the spiral seal according to the physical property parameters of the lubricating oil, the property parameters of the oil slinger and the preset leakage amount includes: Constructing a differential equation for the fluid motion of the lubricating oil on the oil slinger; The fluid motion differential equation is solved by using the physical property parameters of the lubricating oil, the property parameters of the oil slinger and the preset leakage amount to obtain the inlet pressure of the spiral seal.

4. The sealing performance calculation method according to claim 3, characterized in that: The calculation expression of the fluid motion differential equation includes: Among them, V r and V θ are the radial and circumferential components of the absolute velocity of the lubricating oil, Q V is the preset leakage of lubricating oil, ω is the rotation speed of the oil slinger, ρ is the density of the lubricating oil, r is the local diameter of the oil slinger, π is the pi, w is the axial width between the oil slinger and the spiral seal, and μ is the viscosity of the lubricating oil.

5. The sealing performance calculation method according to claim 1, characterized in that: The property parameters of the spiral seal include the linear speed, helix angle, thread tooth height, tooth top clearance, thread tooth width, thread groove width and thread length of the spiral seal. The outlet pressure of the spiral seal is calculated according to the inlet pressure and the property parameters of the spiral seal, including: Constructing a set of algebraic equations regarding the lubricating oil on the spiral seal; The inlet pressure and the property parameters of the spiral seal are input into the algebraic equation group to calculate the outlet pressure of the spiral seal.

6. The sealing performance calculation method according to claim 5, characterized in that: The calculation expression of the algebraic equation group includes: Q V =Q X1 +Q X2 -Q p Among them, Q X1 is the leakage flow rate of the spiral groove in the spiral seal, Q X2 is the gap leakage flow rate of the spiral seal, Q p is the pumping flow in the spiral seal, Q V is the volume flow rate of lubricating oil leakage, V is the linear speed of the spiral shaft in the spiral seal, α is the helix angle of the spiral seal, h is the thread tooth height of the spiral seal, c is the tooth top clearance of the spiral seal, a is the thread tooth width of the spiral seal, b is the thread groove width of the spiral seal, L is the thread length of the spiral seal, P1 is the inlet pressure of the spiral seal, and P2 is the outlet pressure of the spiral seal.

7. The sealing performance calculation method according to claim 1, characterized in that: The property parameters of the comb-tooth seal include the leakage area, comb-tooth radius, number of seal teeth and motor cavity side pressure of the comb-tooth seal. The leakage volume flow rate of the comb-tooth seal is calculated according to the outlet pressure and the property parameters of the comb-tooth seal, including: Constructing a flow leakage equation for lubricating oil on the comb seal; The outlet pressure and the property parameters of the comb seal are input into the flow leakage equation to calculate the leakage volume flow rate.

8. The sealing performance calculation method according to claim 7, characterized in that: The flow leakage equation may include one of a Martin equation or an Egli equation.

9. A sealing performance calculation device for an oil circuit sealing structure, characterized in that: The oil circuit sealing structure includes an oil slinger, a spiral seal and a comb seal, and the sealing performance calculation device includes: An acquisition module, used to acquire the property parameters of the oil circuit sealing structure and the physical property parameters of the lubricating oil, wherein the property parameters include the property parameters of the oil slinger, the property parameters of the spiral seal and the property parameters of the comb seal; A solution module, used for solving the inlet pressure of the spiral seal according to the physical property parameters of the lubricating oil, the property parameters of the oil slinger and the preset leakage amount; A first calculation module, used for calculating the outlet pressure of the spiral seal according to the inlet pressure and the property parameters of the spiral seal; a second calculation module, configured to calculate a leakage volume flow rate of the comb-tooth seal according to the outlet pressure and a property parameter of the comb-tooth seal; and A determination module is used to determine the sealing performance result of the oil circuit sealing structure according to the leakage volume flow and the preset leakage amount.

10. A HVAC equipment, characterized in that: The invention comprises a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor implements the sealing performance calculation method according to any one of claims 1 to 8.

11. A non-volatile computer-readable storage medium, characterized in that: The readable storage medium contains a computer program, and when the computer program is executed by a processor, the processor implements the sealing performance calculation method according to any one of claims 1 to 8.

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