Design method of lubricating system for reciprocating compressor

Abstract

This invention discloses a design method for a reciprocating compressor lubrication system, belonging to the field of compressor lubrication technology, including: S1, determining the oil quantity of the cylinder lubrication system; the oil quantity of the cylinder lubrication system includes the cylinder lubricating oil quantity and the packing lubricating oil quantity; determining the oil quantity of the cylinder lubrication system includes determining the base oil quantity Q at each cylinder oil injection point. c1i And based on the base oil quantity Q at each cylinder's oil injection point c1i Determine the theoretical oil quantity Q required for each cylinder's oil injection point. t1i ; and determine the base oil quantity Q at each filler injection point. c2i And based on the base oil quantity Q at each filler injection point c2i Determine the theoretical oil quantity Q required at each filler injection point. t2i S2, select the distribution block; S3, select the oil pump; This invention can ensure that the cylinder is adequately lubricated, extend the service life of the compressor, and reduce the consumption of cylinder lubricating oil, thus saving lubrication costs; It can also ensure that the oil pump is properly selected, avoiding insufficient lubrication or wasted power.

Description

Technical Field

[0001] This invention relates to the field of compressor lubrication technology, and more specifically, to a design method for a reciprocating compressor lubrication system. Background Technology

[0002] The compressor lubrication system plays a crucial role in the stable operation of the entire compressor. The compressor lubrication system is mainly divided into two parts: the body lubrication system and the cylinder lubrication system. The vast majority of machine failures are caused by lubrication system malfunctions, and the losses resulting from compressor downtime are enormous.

[0003] The compressor's lubrication system lubricates the transmission mechanism, including the crankshaft assembly, connecting rod assembly, and crosshead assembly. Lubrication is typically pressure lubrication, which uses an oil pump to deliver lubricating oil to each friction surface. Poor lubrication of the compressor body will lead to abnormal wear of the compressor's moving parts, resulting in a sharp decrease in its service life.

[0004] The cylinder lubrication system provides lubrication for the cylinder walls, piston rod, and packing, primarily including splash lubrication, pressure lubrication, and spray lubrication. Currently, a problem with cylinder lubrication systems is the improper design of the lubricating oil quantity, resulting in either too much or too little oil. Excessive oil quantity leads to lubricating oil waste, potentially amounting to hundreds of thousands of yuan per unit per year for large units. Insufficient oil quantity causes wear on the cylinder and packing, necessitating major overhauls and reducing the compressor's lifespan.

[0005] In addition, due to the unreasonable design of the compressor's lubricating oil quantity, the selected oil injection pump is unsuitable, resulting in insufficient lubrication or wasted power.

[0006] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the Invention

[0007] The technical problem to be solved by this invention is to provide a design method for a reciprocating compressor lubrication system, which addresses the above-mentioned shortcomings and can achieve the following objectives:

[0008] 1. It can ensure that the cylinder is adequately lubricated, extend the service life of the compressor, and reduce the consumption of cylinder lubricating oil, thus saving lubrication costs;

[0009] 2. It can ensure that the oil pump is selected appropriately, avoiding insufficient lubrication or wasted power.

[0010] To solve the above technical problems, the present invention adopts the following technical solution: a design method for a reciprocating compressor lubrication system, comprising:

[0011] S1, determine the oil quantity of the cylinder lubrication system;

[0012] The oil quantity of the cylinder lubrication system includes the cylinder lubricating oil quantity and the filler lubricating oil quantity;

[0013] Determining the oil quantity in the cylinder lubrication system includes determining the base oil quantity Q at each cylinder injection point. c1i And based on the base oil quantity Q at each cylinder's oil injection point c1i Determine the theoretical oil quantity Q required for each cylinder's oil injection point. t1i ;

[0014] In addition, determine the base oil quantity Q at each filler injection point. c2i And based on the base oil quantity Q at each filler injection point c2i Determine the theoretical oil quantity Q required at each filler injection point. t2i ;

[0015] S2, Select the allocation block;

[0016] S3, select the oil injection pump.

[0017] Furthermore, the base oil quantity Q at each cylinder injection point c1i Determined by the following formula:

[0018] Q c1i =n1×b1×ks

[0019] In the formula: Q c1i Set the base oil level at each cylinder's oil injection point;

[0020] n1 is a calculation coefficient, which depends on the single crankshaft power of the compressor;

[0021] b1 is the cylinder inner diameter;

[0022] ks is the compressor speed correction coefficient;

[0023] Theoretical oil quantity Q required at each cylinder injection point t1i Determined by the following formula:

[0024] Q t1i =Q c1i ×kc

[0025] In the formula, Q t1i The theoretical oil quantity required for each cylinder's oil injection point;

[0026] kc is the multiplier, which is determined by the gas composition and the exhaust pressure at each stage.

[0027] Furthermore, the base oil quantity Q at the filler injection point c2i Determined by the following formula:

[0028] Q c2i =n2×b2×ks

[0029] In the formula, Q c2iThe base oil volume at the filler injection point;

[0030] n2 is the calculation coefficient, n2=2n1;

[0031] b2 is the diameter of the piston rod;

[0032] ks is the compressor speed correction coefficient;

[0033] Theoretical oil quantity Q required at each packing injection point t2i Determined by the following formula:

[0034] Q t2i =Q c2i ×kc

[0035] In the formula, Q t2i This represents the theoretical oil quantity required at each filler injection point; kc is the multiplier.

[0036] Furthermore, in S2, selecting the allocation block includes the following steps:

[0037] S2.1, Select the loop time t, where t is between 20S and 60S;

[0038] S2.2, Select the allocation block and calculate the actual daily oil injection volume of the allocation block corresponding to each oil injection point;

[0039] S2.3 Calculate the ratio i of the actual oil injection volume of the selected distribution block to the theoretical oil injection volume required at the injection point, and determine whether i is within the preset range; when i is within the preset range, the distribution block is selected appropriately; when i is not within the preset range, repeat steps S2.1 and S2.2.

[0040] S2.4 Calculate the total oil injection amount Qz at each lubrication point of the cylinder lubrication system.

[0041] Furthermore, in S3, selecting the oil injection pump includes the following steps:

[0042] S3.1 Select the oil injection pump and calculate the maximum oil output of the oil injection pump;

[0043] S3.2 Calculate the ratio j of the total oil injection amount of each lubrication point in the cylinder lubrication system to the maximum oil injection amount of the oil injection pump, and determine whether j is within the preset range. When j is within the preset range, select an appropriate oil injection pump; when j is not within the preset range, repeat step S3.1.

[0044] Furthermore, in S2.2:

[0045] First, based on the theoretical oil quantity Q required at each lubrication point in the cylinder. t1i and Q t2i Select the distribution block for each oil injection point;

[0046] Secondly, calculate the actual daily oil injection volume Q1 of the selected distribution block at each oil injection point, determined by the following formula:

[0047] Q1 = Qf ÷ 28.8643 × 24 × 60 × 60 ÷ t

[0048] In the formula, Q1 is the actual daily oil injection volume of the selected distribution block at each oil injection point;

[0049] Qf is the single rated oil injection volume within the distribution block cycle time t;

[0050] t is the allocation block cycle time.

[0051] Furthermore, in S2.3, the preset range of i is 1-1.4.

[0052] Furthermore, in S2.4, Qz is the sum of the actual oil injection amounts determined by the distribution blocks at each oil injection point.

[0053] Further, in S3.1, based on Qz obtained in S2.4, an oil injection pump is selected, wherein the oil injection pump is a plunger pump;

[0054] The maximum oil output Qb of the selected oil pump is calculated using the following formula:

[0055] Qb=v×Nc×24×60

[0056] In the formula, Qb is the oil volume of the plunger pump during its entire stroke;

[0057] v represents the oil volume per single stroke of the plunger pump;

[0058] Nc is the rotational speed of the piston pump camshaft.

[0059] Furthermore, in S3.2, the preset range of j is 0.2-0.8.

[0060] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0061] 1. This invention can provide sufficient lubrication to the cylinder, extending the compressor's service life by 30%, while reducing the consumption of cylinder lubricating oil and saving more than 50% in lubrication costs;

[0062] 2. This invention can ensure that the oil pump is selected appropriately, avoiding insufficient lubrication or wasted power.

[0063] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of the fuselage lubrication system of the present invention;

[0065] Figure 2This is a schematic diagram of the cylinder lubrication system of the present invention;

[0066] Figure 3 This is a flowchart of the invention;

[0067] Figure 4 This is the flowchart for selecting the allocation block;

[0068] Figure 5 This is the process flow chart for selecting the oil injection pump.

[0069] In the picture,

[0070] 1-Oil tank, 2-Oil pump, 3-Safety relief valve, 4-Filter, 5-Pressure gauge, 6-Check valve, 7-No-oil flow switch, 8-Distribution block, 9-Circulation indicator, 10-Main body, 11-Oil pump, 12-Temperature control valve, 13-Oil filter. Detailed Implementation

[0071] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings. Example

[0072] This invention provides a design method for a reciprocating compressor lubrication system. The compressor lubrication system includes two lubrication systems: a body lubrication system that provides lubrication for the compressor crankshaft, connecting rod, crosshead and other transmission mechanisms; and a cylinder lubrication system that provides lubrication for the compressor cylinder wall and packing.

[0073] Specifically, such as Figure 1 As shown, the engine block lubrication system employs pressure lubrication. The system includes an oil tank mounted on the engine block 10 and an oil pump 11 mounted on the oil tank. The oil pump 11 is connected to the crankshaft oil port via a pipeline. The oil pump 11 pressurizes the oil, guiding the lubricating oil into the crankshaft oil port and subsequently supplying it to the bearings, connecting rods, and crosshead slides. A temperature control valve 12 and an oil filter 13 are installed on the pipeline connecting the oil pump 11 to the crankshaft oil port.

[0074] like Figure 2 As shown, the cylinder lubrication system includes an oil distribution system, which includes an oil tank 1, an oil pump 2, a filter 4, a pressure gauge 5, a one-way valve 6, an oil-free flow switch 7, and a distribution block 8. The oil pump 2 is a plunger pump, which is placed on the oil tank 1. The oil pump 2 is directly driven by the compressor crankshaft or by an additional drive device, which can be an electric motor.

[0075] The oil pump 2 provides lubricating oil to the cylinders via the oil tank of the engine body lubrication system or an external high-level oil tank. A shut-off valve needs to be installed between the high-level oil tank and the oil pump 2.

[0076] The oil pump 2 is connected to the distribution block 8 via a pipeline. The distribution block 8 has multiple oil outlets, each corresponding to an oil injection point (i.e., the cylinder lubrication system has multiple oil injection points). A one-way valve 6 is installed at each oil outlet. A filter 4 and a pressure gauge 5 are installed on the pipeline between the oil pump 2 and the distribution block 8.

[0077] The distribution block 8 is also equipped with an oil-free flow switch 7 and a circulation indicator 9; the oil pump 2 is also connected to a safety relief valve 3; when the oil circuit is blocked or other abnormal conditions occur, the system pressure will continue to increase, then the safety relief valve 3 will open to release the pressure in the entire system, and at the same time the oil-free flow switch 7 will stop the compressor.

[0078] like Figure 3-5 As shown, the design method of the reciprocating compressor lubrication system includes the following steps:

[0079] S1, determine the amount of lubricating oil circulating in the fuselage lubrication system.

[0080] The temperature difference of the lubricating oil before and after cooling in the engine body lubrication system is obtained, and parameters such as the crankshaft power of the compressor, the mechanical efficiency of the compressor, the density of the lubricating oil, and the specific heat capacity of the lubricating oil are determined. Based on these parameters, a method for calculating the circulating oil volume of the engine body lubrication system is proposed.

[0081] The calculation method for the lubrication circulation oil volume of the fuselage lubrication system is as follows:

[0082] Q j =0.3×P sh ×(1-η m )×60÷(ρ×c×Δt)

[0083] In the formula, Q j This refers to the amount of lubricating oil circulating in the machine body, expressed in L / min.

[0084] P sh This refers to the compressor crankshaft power, measured in kW.

[0085] η m For mechanical efficiency;

[0086] ρ is the density of the lubricating oil, in kg / L;

[0087] c represents the specific heat capacity of the lubricating oil, expressed in J / (kg·K).

[0088] Δt represents the temperature of the lubricating oil before cooling and the temperature of the lubricating oil after cooling, in °C.

[0089] S2, determine the oil quantity of the cylinder lubrication system.

[0090] S2.1 Determine the data such as cylinder inner diameter, exhaust pressure of each stage of gas, gas composition, compressor speed, piston rod diameter, and compressor model parameters in the cylinder lubrication system, and propose a method for calculating the oil quantity of the cylinder lubrication system based on the determined parameters.

[0091] According to the cylinder lubrication system settings, the oil quantity of the cylinder lubrication system includes two parts: the cylinder lubricating oil quantity and the packing lubricating oil quantity; that is, the cylinder lubrication system oil quantity = cylinder lubricating oil quantity + packing lubricating oil quantity.

[0092] It should be noted that the unit for calculating the oil quantity of the cylinder lubrication system is PPD (pints / day, 1 pint = 0.473L).

[0093] S2.2, Calculate the base oil quantity Q at each oil injection point of the cylinder lubrication system. c And according to Q c Calculate the theoretical oil quantity Q required at each oil injection point in the cylinder lubrication system. t .

[0094] It should be noted that the oil filling points of the cylinder lubrication system include multiple cylinder oil filling points and multiple packing oil filling points. The base oil quantity at each cylinder oil filling point is denoted by Q. c1i The base oil quantity at each filler injection point is indicated by Q. c2i The theoretical oil requirement for each cylinder's injection point is represented by Q. t1i The theoretical oil requirement at each filler injection point is represented by Q. t2i This indicates that the base oil quantity Q is calculated at each oil injection point in the cylinder lubrication system. c And theoretical oil demand Q t At this time, it is necessary to first calculate the base oil quantity Q at each cylinder injection point. c1i and the base oil quantity Q at each filler injection point c2i Then, calculate the theoretical oil quantity Q required for each cylinder's oil injection point. t1i Theoretical oil quantity Q required at each filler injection point t2i .

[0095] First, calculate the base oil quantity Q at each cylinder's injection point. c1i and the theoretical oil quantity Q required at each cylinder injection point t1i .

[0096] The base oil quantity at each cylinder injection point is determined by the following formula:

[0097] Q c1i =n1×b1×ks

[0098] Among them, Q c1i The base oil quantity for each cylinder injection point is expressed in PPD (pints / day).

[0099] n1 is a calculation coefficient. n1 depends on the crankshaft single-crankshaft power of the compressor. For crankshaft single-crankshaft power < 200kW, the coefficient is 0.25; for 200kW < crankshaft single-crankshaft power < 500kW, the coefficient is 0.35; for crankshaft single-crankshaft power > 500kW, the coefficient is 0.45.

[0100] b1 is the cylinder inner diameter, in inches;

[0101] ks is the compressor speed correction factor, which is equal to the actual speed divided by the maximum speed of the model.

[0102] The theoretical oil quantity required at each cylinder's injection point is determined by the following formula:

[0103] Q t1i =Q c1i ×kc

[0104] Among them, Q t1i The theoretical oil requirement for each cylinder's oil injection point is expressed in PPD (pints / day).

[0105] kc is the multiplier, determined by the gas composition and the exhaust pressure at each stage, and ranges from 1 to 3, further including values ​​of 1, 1.25, 1.5, 2, and 3. See Table 1 for details.

[0106] Table 1:

[0107]

[0108] Secondly, calculate the base oil quantity Q at each filler injection point. c2i and the theoretical oil quantity Q required at each filler injection point t2i .

[0109] The base oil quantity at the filler injection point is determined by the following formula:

[0110] Q c2i =n2×b2×ks

[0111] Among them, Q c2i The base oil quantity at the filler injection point is expressed in PPD (pints / day).

[0112] n2 is the calculation coefficient, n2=2n1;

[0113] b2 is the piston rod diameter, in inches;

[0114] ks is the compressor speed correction factor, which is equal to the actual speed divided by the maximum speed of the model.

[0115] The theoretical oil requirement at each filler injection point is determined by the following formula:

[0116] Q t2i =Q c2i×kc

[0117] Among them, Q t2i The theoretical oil quantity required for each packing injection point is expressed in PPD (pints / day).

[0118] kc is the multiplier, which is the same as the kc in the calculation of the theoretical oil demand at each cylinder injection point. The multiplier is determined by the gas composition and the exhaust pressure at each stage, and the value is 1-3. Further values ​​include 1, 1.25, 1.5, 2, 3, etc. See Table 1 for details.

[0119] S3, Select allocation block.

[0120] like Figure 4 As shown, selecting an allocation block includes the following steps:

[0121] S3.1 Select the loop time t, which is between 20S and 60S.

[0122] S3.2 Select the distribution block and calculate the actual daily oil injection volume of the distribution block corresponding to each oil injection point.

[0123] First, based on the theoretical oil quantity Q required at each lubrication point in the cylinder. t1i and Q t2i Select the distribution block for each oil injection point.

[0124] Next, calculate the actual daily oil injection volume of the selected distribution block at each oil injection point (i.e., the daily oil injection volume of the distribution block):

[0125] Q1 = Qf ÷ 28.8643 × 24 × 60 × 60 ÷ t

[0126] Wherein, Q1 is the actual daily oil injection volume of the selected distribution block at each oil injection point (daily oil injection volume of the distribution block), in PPD;

[0127] Qf represents the rated oil injection volume per cycle within the distribution block (only one oil injection is performed within cycle time t). One or more injection points can share a single distribution block, with the unit being inches. 3 / CYCLE; and according to 1 pint = 28.8643in 3 Therefore, Qf÷28.8643 is a unit conversion for Qf.

[0128] t represents the allocation block cycle time, in seconds.

[0129] It should be noted that 24×60×60÷t represents the number of daily cycle times t for the allocation block.

[0130] S3.3 Calculate the ratio i of the actual oil injection volume of the selected allocation block to the theoretical oil demand volume of the corresponding oil injection point, and determine whether i is within the preset range.

[0131] First, the formula for calculating i is as follows:

[0132] i=Q1 / Q t ;

[0133] Q1 represents the actual amount of oil injected into the distribution block each day, expressed in PPD (pints / day).

[0134] Q t The theoretical daily oil demand for each oil filling point is expressed in PPD (pints / day).

[0135] Secondly, the preset range of i is determined to be 1-1.4, preferably 1-1.05;

[0136] When the actual daily oil injection volume Q1 of the selected allocation block is different from the theoretical daily oil demand Q of the injection point... t When the ratio i is within a preset range, the selected allocation block is appropriate, and the allocation block information for each injection point is output. This is because the actual daily injection volume Q1 of the selected allocation block is equal to the theoretical daily oil demand Q of the injection point. t If the ratio i is not within the preset range, repeat steps S3.1 and S3.2 until the selected allocation block is appropriate, and output the allocation block information for each oil injection point.

[0137] S3.4, Calculate the total daily oil injection amount Qz at each lubrication point of the cylinder lubrication system;

[0138] Qz is the sum of the actual oil injection volume Q1 determined by each oil injection point and the distribution block.

[0139] S4, select the oil injection pump.

[0140] like Figure 5 As shown, selecting an oil injection pump includes the following steps:

[0141] S4.1 Select the oil injection pump and calculate the maximum oil output of the oil injection pump;

[0142] Based on Qz obtained in S3.4, select an oil injection pump that can meet the requirements of Qz, preferably a plunger pump.

[0143] Calculate the maximum oil output of the selected oil pump:

[0144] Qb=v×Nc×24×60

[0145] Where Qb is the oil volume of the plunger pump during its full stroke, in PPD (pints / day).

[0146] v represents the oil volume of the plunger pump in a single stroke, measured in pints.

[0147] Nc is the camshaft speed of the plunger pump, in r / min;

[0148] It should be noted that: Nc is in r / min, and Nc×24×60 can be converted to the unit of revolutions / day; the amount of oil pumped in one revolution, one stroke, is Qb=v×Nc×24×60, in pints / day.

[0149] S4.2 Calculate the ratio j of the total oil injection volume of each lubrication point to the maximum oil injection volume of the oil injection pump, i.e., j=Qz / Qb, and determine whether j is within the preset range;

[0150] The preset range for j is determined to be 0.2-0.8;

[0151] When j is in the range of 0.2-0.8, the appropriate oil injection pump is selected; when j is not in the range of 0.2-0.8, repeat step S4.1 until the appropriate oil injection pump is selected.

[0152] S5, select other accessories for the lubrication system.

[0153] Select appropriate pressure gauges, safety relief valves, circulation indicators, and oil-free flow switches based on pressure and actual requirements. Choose the lubricating oil grade based on gas composition and pressure rating.

[0154] The design method described in this invention is used to design the lubrication system of a reciprocating compressor in a large gas storage facility, specifically including the following steps:

[0155] Step 1: Determine that the compressor crankshaft power is 462 kW, the single crankshaft power is 231 kW, the maximum speed of the compressor is 1800 r / min, the actual maximum speed of the compressor is 1800 r / min, the piston rod diameter of the cylinder used in the compressor is 1.5 in; the compressor uses two-stage compression, with discharge pressures of 3 MPa and 6 MPa respectively; the gas medium is dry natural gas.

[0156] The compressor uses cylinders and packing with a single oil filling point. The diameter of the first-stage cylinder is 8 inches, and the diameter of the second-stage cylinder is 5 inches.

[0157] Step 2: Calculate the base oil quantity Q at the injection point of each of the two cylinders according to the aforementioned formula. c1i and the base oil quantity Q at the two-stage packing injection point c2i The specific calculation is as follows (unit: PPD):

[0158] First-stage cylinder oil injection point Q c11 =0.35×8×1800 / 1800=2.8;

[0159] Primary packing oil injection point Q c21 =0.35×2×1.5×1800 / 1800=1.05;

[0160] Secondary cylinder oil injection point Q c12=0.35×5×1800 / 1800=1.75;

[0161] Secondary packing oil injection point Q c22 =0.35×2×1.5×1800 / 1800=1.05;

[0162] Calculate the oil injection point Q of the two-stage cylinders using the aforementioned formula. t1i Theoretical oil quantity Q required for the filler injection point t2i The specific calculation is as follows (unit: PPD):

[0163] First-stage cylinder oil injection point Q t11 =Q c11 ×1=2.8;

[0164] Primary packing oil injection point Q t21 =Q c21 ×1=1.05;

[0165] Secondary cylinder oil injection point Q t12 =Q c12 ×1=1.75;

[0166] Secondary packing oil injection point Q t22 =Q c22 ×1=1.05;

[0167] Step 3, Selection of allocation blocks

[0168] Step 3.1, initially select the loop time t, t=43s;

[0169] Step 3.2: Based on the theoretical oil demand of each injection point in Step 2, select the distribution block for each injection point.

[0170] Select the appropriate distribution block model for each oil injection point, as follows:

[0171] The first-stage cylinder oil injection point is selected using a distribution block with a Qf of 0.05 inches. 3 / CYCLE;

[0172] The secondary cylinder oil injection point is selected using a distribution block with a Qf of 0.03 inches. 3 / CYCLE;

[0173] The primary packing oil injection point is selected from the distribution block, with a Qf of 0.021 inch. 3 / CYCLE;

[0174] The secondary packing oil injection point is selected from the distribution block, with a Qf of 0.021 inch. 3 / CYCLE;

[0175] The actual oil injection volume Q1 (unit PPD) of the selected distribution block is calculated according to the aforementioned formula:

[0176] Selection of the oil injection point distribution block for the first-stage cylinder: Q1 = 0.05 ÷ 28.8643 × 24 × 60 × 60 ÷ 43 = 3.481;

[0177] Selection of the oil injection point distribution block for the second-stage cylinder: Q1 = 0.03 ÷ 28.8643 × 24 × 60 × 60 ÷ 43 = 2.088;

[0178] Selection of primary packing oil injection point distribution block: Q1 = 0.021 ÷ 28.8643 × 24 × 60 × 60 ÷ 43 = 1.462;

[0179] Selection of the secondary packing oil injection point distribution block: Q1 = 0.021 ÷ 28.8643 × 24 × 60 × 60 ÷ 43 = 1.462;

[0180] Step 3.3: Calculate the ratio of the actual oil injection volume to the theoretical oil demand at each injection point for each distribution block.

[0181] The oil injection point for the first-stage cylinder is i = 3.481 / 2.8 = 1.243;

[0182] The oil injection point for the second-stage cylinder is i = 2.088 / 1.75 = 1.193.

[0183] The oil injection point for the primary packing is i = 1.462 / 1.05 = 1.392.

[0184] The oil injection point for the secondary packing is i = 1.462 / 1.05 = 1.392;

[0185] As can be seen from the above, all the i values ​​are within the preset range of 1-1.4, indicating that the selected allocation block model is appropriate.

[0186] Step 3.4: Calculate the actual total oil injection volume Qz at each injection point;

[0187] Qz=3.481+2.088+1.462+1.462=8.493.

[0188] Step 4. Selection of the oil injection pump.

[0189] Step 4.1: Based on Qz obtained in step 3.4, select an oil pump that can meet Qz. The oil pump is a 1 / 4 plunger pump with a single-stroke oil volume v of 0.0006236 pint.

[0190] The oil volume Qb of the selected plunger pump throughout its entire stroke can be calculated using the aforementioned formula:

[0191] Qb=0.0006236×1800÷60×24×60=26.94.

[0192] It should be noted that 1800 is the engine speed of the machine body. After being transmitted to the cam in the oil tank that drives the plunger pump, the speed of the cam becomes 1800 ÷ 60 due to the transmission ratio of 60:1.

[0193] Step 4.2, calculate the ratio of Qz to Qb.

[0194] Qz / Qb=8.493 / 26.94=0.32, which is within the range of 0.2-0.8, indicating that the oil injection pump is suitable.

[0195] S5, select other accessories for the lubrication system.

[0196] Select appropriate pressure gauges, safety relief valves, circulation indicators, and oil-free flow switches based on pressure and actual requirements. Choose the lubricating oil grade based on gas composition and pressure rating.

[0197] It should be noted that the fuselage lubrication system only involves determining the amount of lubricating oil circulating in the fuselage lubrication system, which can be obtained through the aforementioned formula and parameters. It does not involve the selection of the distribution block and the oil injection pump, so it will not be described in detail here.

[0198] The above description provides examples of the preferred embodiments of the present invention. Parts not detailed herein are common knowledge to those skilled in the art. The scope of protection of the present invention is determined by the claims. Any equivalent modifications based on the technical teachings of the present invention are also within the scope of protection of the present invention.

Claims

1. A design method for a lubrication system of a reciprocating compressor, characterized in that, The method includes: S1, determine the oil quantity of the cylinder lubrication system; The oil quantity of the cylinder lubrication system includes the cylinder lubricating oil quantity and the filler lubricating oil quantity; Determining the oil quantity in the cylinder lubrication system includes determining the base oil quantity Q at each cylinder injection point. c1i And based on the base oil quantity Q at each cylinder's oil injection point c1i Determine the theoretical oil quantity Q required at each cylinder's oil injection point. t1i ; In addition, determine the base oil quantity Q at each filler injection point. c2i And based on the base oil quantity Q at each filler injection point c2i Determine the theoretical oil quantity Q required at each filler injection point. t2i ; S2, Select the allocation block; S3, select the oil injection pump; Base oil quantity Q at each cylinder injection point c1i Determined by the following formula: Q c1i =n1×b1×ks In the formula: Q c1i Set the base oil level at each cylinder's oil injection point; n1 is a calculation coefficient, which depends on the single crankshaft power of the compressor; b1 is the cylinder inner diameter; ks is the compressor speed correction coefficient; Theoretical oil quantity Q required at each cylinder injection point t1i Determined by the following formula: Q t1i =Q c1i ×kc In the formula, Q t1i The theoretical oil quantity required for each cylinder's oil injection point; kc is the multiplier, which is determined by the gas composition and the exhaust pressure of each stage. In S2, selecting the allocation block includes the following steps: S2.1, Select the loop time t, where t is between 20S and 60S; S2.2, Select the allocation block and calculate the actual daily oil injection volume of the allocation block corresponding to each oil injection point; S2.3 Calculate the ratio i of the actual oil injection volume of the selected distribution block to the theoretical oil injection volume required at the injection point, and determine whether i is within the preset range; when i is within the preset range, the distribution block is selected appropriately; when i is not within the preset range, repeat steps S2.1 and S2.

2. S2.4 Calculate the total oil injection amount Qz at each lubrication point of the cylinder lubrication system.

2. The design method for the lubrication system of a reciprocating compressor as described in claim 1, characterized in that, base oil quantity Q at the filler injection point c2i Determined by the following formula: Q c2i =n2×b2×ks In the formula, Q c2i The base oil volume at the filler injection point; n2 is the calculation coefficient, n2=2n1; b2 is the diameter of the piston rod; ks is the compressor speed correction coefficient; Theoretical oil quantity Q required at each packing injection point t2i Determined by the following formula: Q t2i =Q c2i ×kc In the formula, Q t2i This represents the theoretical oil quantity required at each filler injection point; kc is the multiplier.

3. The design method for the lubrication system of a reciprocating compressor as described in claim 1, characterized in that, In S3, selecting the injection pump includes the following steps: S3.1 Select the oil injection pump and calculate the maximum oil output of the oil injection pump; S3.2 Calculate the ratio j of the total oil injection amount of each lubrication point in the cylinder lubrication system to the maximum oil injection amount of the oil injection pump, and determine whether j is within the preset range. When j is within the preset range, select an appropriate oil injection pump; when j is not within the preset range, repeat step S3.

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4. The design method for the lubrication system of a reciprocating compressor as described in claim 1, characterized in that, In S2.2: First, based on the theoretical oil quantity Q required at each lubrication point in the cylinder. t1i and Q t2i Select the distribution block for each oil injection point; Secondly, calculate the actual daily oil injection volume Q1 of the selected distribution block at each oil injection point, determined by the following formula: Q1 = Qf ÷ 28.8643 × 24 × 60 × 60 ÷ t In the formula, Q1 is the actual daily oil injection volume of the selected distribution block at each oil injection point; Qf is the single rated oil injection volume within the distribution block cycle time t; t is the allocation block cycle time.

5. The design method for the lubrication system of a reciprocating compressor as described in claim 1, characterized in that, In S2.3, the preset range of i is 1-1.

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6. The design method for the lubrication system of a reciprocating compressor as described in claim 1, characterized in that, In S2.4, Qz is the sum of the actual oil injection amounts determined by each oil injection point in the distribution block.

7. The design method for the lubrication system of a reciprocating compressor as described in claim 3, characterized in that, In S3.1, based on Qz obtained in S2.4, an oil injection pump is selected, wherein the oil injection pump is a plunger pump; The maximum oil output Qb of the selected oil pump is calculated using the following formula: Qb=v×Nc×24×60 In the formula, Qb is the oil volume of the plunger pump during its entire stroke; v represents the oil volume per single stroke of the piston pump; Nc is the rotational speed of the piston pump camshaft.

8. The design method for the lubrication system of a reciprocating compressor as described in claim 3, characterized in that, In S3.2, the preset range of j is 0.2-0.8.

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