A high-power hydraulic transmission for fracturing operations

Abstract

The application provides a high-power hydraulic transmission for fracturing operation, which comprises a first planetary gear train, a second planetary gear train, a third planetary gear train, a fourth planetary gear train, a torque converter, a first clutch, a first brake, a second clutch, a second brake, a third brake and a fourth brake. The application realizes seven gears through the combination of the two clutches, the four brakes and the four planetary gear trains, and the speed ratio difference between each gear is not more than 1.5, so that the high-pressure pump has higher output power.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of high-power hydraulic transmission of fracturing operation. BACKGROUND

[0002] At present, the fracturing equipment of shale gas, coalbed gas, natural gas 3000 horsepower high-power hydraulic transmission is mostly imported product, the existing technology of domestic hydraulic transmission manufacturer is not adapted to the needs of the development of fracturing equipment of shale gas, coalbed gas, natural gas, the maximum speed ratio of automatic hydraulic transmission produced in China before is 3.79, different transmission ratio is realized by the combination of different clutches or brakes.But the speed ratio of the hydraulic transmission used in current fracturing operation is small, which is not suitable for the needs of shale gas and coalbed gas exploration and development. SUMMARY

[0003] To solve the above technical problems, the present application provides a kind of high-power hydraulic transmission of fracturing operation.

[0004] The present application is realized by the following technical scheme.

[0005] The present application provides a kind of high-power hydraulic transmission of fracturing operation, including first planetary row, second planetary row, third planetary row, fourth planetary row, torque converter, first clutch, first brake, second clutch, second brake, third brake, fourth brake;Its characterized in that:

[0006] The first planetary row includes first ring gear, first carrier, first sun gear, the second planetary row includes second ring gear, second carrier, second sun gear, the third planetary row includes third ring gear, third carrier, third sun gear, fourth planetary row includes fourth ring gear, fourth carrier, fourth sun gear;

[0007] The first ring gear is connected with input member continuously;

[0008] The first clutch selectively connects the first sun gear with input member, and the first brake selectively connects the first sun gear with fixed member;

[0009] The first carrier is connected with second sun gear and third sun gear by connecting member, and the connecting member is selectively connected with second ring gear by second clutch;

[0010] The second brake selectively connects the second ring gear with fixed member;

[0011] The second carrier is connected with third ring gear and fourth carrier by second connecting member;

[0012] The third brake selectively connects the third ring gear with fixed member;

[0013] The third carrier is connected with a fourth sun gear, and a fourth brake selectively connects the output shaft with the third carrier.

[0014] The fixing member is a transmission housing.

[0015] The first planetary gear set, the second planetary gear set, the third planetary gear set and the fourth planetary gear set are single-pole single-row planetary gears.

[0016] The transmission establishes at least seven forward gear ratios.

[0017] The seven forward gears include a first gear, in which the first brake and the third brake are engaged, the first sun gear and the third ring gear are braked, the input member and the first ring gear rotate synchronously, the first carrier and the third sun gear rotate synchronously, the output shaft and the third carrier rotate synchronously, and the transmission has a speed ratio of 4.74.

[0018] The seven forward gears include a second gear, in which the first clutch and the third brake are engaged, the third ring gear is braked, the input member and the third sun gear rotate synchronously, the output shaft and the third carrier rotate synchronously, and the transmission has a speed ratio of 3.31.

[0019] The seven forward gears include a third gear, in which the first brake and the second brake are engaged, the first sun gear and the second ring gear are braked, the input member and the first ring gear rotate synchronously, the first carrier and the second sun gear rotate synchronously, the second carrier and the third ring gear rotate synchronously, the output shaft and the third carrier rotate synchronously, and the transmission has a speed ratio of 2.98.

[0020] The seven forward gears include a fourth gear, in which the first brake and the fourth brake are engaged, the first sun gear and the fourth sun gear are braked, the input member and the first ring gear rotate synchronously, the first carrier and the second sun gear rotate synchronously, the third ring gear and the first carrier rotate synchronously, the third carrier, the fourth ring gear and the output shaft rotate synchronously, and the transmission has a speed ratio of 2.36.

[0021] The seven forward gears include a fifth gear, in which the first brake and the second brake are engaged, the second ring gear is braked, the input member and the second sun gear rotate synchronously, the second carrier and the third ring gear rotate synchronously, the third carrier and the output shaft rotate synchronously, and the transmission has a speed ratio of 2.09.

[0022] The seven forward gears include six gears, and when the six gears are engaged: the first clutch and the fourth brake are engaged, the fourth sun gear is braked, the output shaft rotates synchronously with the third sun gear, the second planet carrier rotates synchronously with the third ring gear, the third planet carrier rotates synchronously with the fourth ring gear and the output shaft, and the speed ratio of the transmission is 1.65; when the seven gears are engaged: the first brake and the second clutch are engaged, the input member is connected with the first ring gear, the first sun gear is braked, the first planet carrier rotates synchronously with the output shaft, and the speed ratio of the transmission is 1.43.

[0023] The beneficial effects of the present application are that: through two clutches, four brakes and four planetary rows, seven gears are realized through the engagement between the clutches and the brakes, the speed ratio difference between each gear is not more than 1.5, and the high-pressure pump has higher output power. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of the present application;

[0025] Figure 2 is a one-gear transmission principle schematic diagram of the present application;

[0026] Figure 3 is a two-gear transmission principle schematic diagram of the present application;

[0027] Figure 4 is a three-gear transmission principle schematic diagram of the present application;

[0028] Figure 5 is a four-gear transmission principle schematic diagram of the present application;

[0029] Figure 6 is a five-gear transmission principle schematic diagram of the present application;

[0030] Figure 7 is a six-gear transmission principle schematic diagram of the present application;

[0031] Figure 8 is a seven-gear transmission principle schematic diagram of the present application;

[0032] In the figure: 1-first planetary row, 11-first ring gear, 12-first planet carrier, 13-first sun gear, 2-second planetary row, 21-second ring gear, 22-second planet carrier, 23-second sun gear, 3-third planetary row, 31-third ring gear, 32-third planet carrier, 33-third sun gear, 4-torque converter, 41-one-way clutch, 42-locking device, 43-input member, 5-first clutch, 6-first brake, 7-second clutch, 8-second brake, 9-third brake, 10-output shaft. DETAILED DESCRIPTION

[0033] The technical solutions of the present application are described further below, but the scope of protection is not limited to the description.

[0034] As shown in Figure 1 The transmission of the present application establishes seven gears, the input shaft is directly connected with the P1 ring gear, the P1 planet carrier, the P3 sun gear and the P2 sun gear are connected, the P2 planet carrier is connected with the P4 planet carrier; the brake Z1 is connected with the clutch L1; the brake Z2 is connected with the clutch L2 and the P2 ring gear; the brake Z3 is connected with the P4 planet carrier, the P2 planet carrier and the P3 ring gear; the brake Z4 is connected with the P4 sun gear; the P3 planet carrier and the P4 ring gear are connected with the output shaft.

[0035] a1 is the structural parameter of the first planetary gear set P1, a2 is the structural parameter of the second planetary gear set P2, a3 is the structural parameter of the third planetary gear set P3, and a4 is the structural parameter of the fourth planetary gear set P4.

[0036] In the transmission ratio calculation process, nt is the sun gear speed, nj is the planet carrier speed, nq is the ring gear speed, n0 is the input speed, and n1 is the output speed.

[0037] As shown in Figure 2 : When the first gear is engaged, the brake Z1 and the brake Z3 are engaged, the P1 sun gear and the P3 ring gear brake the input shaft and the P1 ring gear, the P1 planet carrier is connected with the P3 sun gear, and the output shaft is connected with the P3 planet carrier.

[0038] According to the basic formula nt1+ a1*nq1-(1+a1)nj1=0, the following can be obtained:

[0039] nj1=nt1+ a1*nq1 / (1+a1), nt1=0, nq1=n0

[0040] nt3+ a1*nq3-(1+a3)nj3=0

[0041] nj1=nt3, nj3=n1, nq3=0

[0042] nt1+ a1*nq1 / (1+a1)+ a1*nq3=(1+a3)nj3

[0043] a1*nq1 / (1+a1)=(1+a3)nj3

[0044] i=n0 / n1=nq1 / nj3=(1+a3)(1+a1) / a1

[0045] At this time, the speed ratio of the planetary gear transmission mechanism is i1=(1+a3)*(1+a1) / a1

[0046] i1 = (1 + 2.314) (1 + 2.318) / 2.318 = 4.74.

[0047] As Figure 3 : when the second gear, clutch L1 and brake Z3 combined, P3 ring gear brake. The input shaft and P3 sun gear directly connected, P1 carrier and P3 sun gear connected, the output shaft and P3 carrier connected.

[0048] According to the basic formula nt1 + α1*nq1 - (1 + α1)nj1 = 0 deformation

[0049] n0 = nt3, nj3 = n1, nt3 = (1 + a3)nj3

[0050] i2 = n0 / n1 = nt3 / nj3 = 1 + a3 = 1 + 2.314 = 3.31

[0051] n1 = the planetary gear transmission ratio at this time is i2 = 3.31.

[0052] As Figure 4 : when the third gear, brake Z1 and brake Z2 combined, P1 sun gear, P2 ring brake. The input shaft and P1 ring connected, P1 carrier and P2 sun gear connected, P2 carrier and P3 ring connected, the output shaft and P3 carrier connected.

[0053] According to the basic formula nt1 + α1*nq1 - (1 + α1)nj1 = 0 deformation

[0054] α1*nq1 = (1 + α1)nj1 = (1 + α1)nt2,

[0055] nj1 = α1*n0 / (1 + α1), n0 = (1 + α1) *nj1 / α1

[0056] nq2 = 0, nj2 = nq3, nt2 = nj1, nj3 = n1

[0057] According to the basic formula nt2 + a2*nq2 - (1 + a2)nj2 = 0 deformation

[0058] nj2 = nt2 / (1 + a2) = nj1 / (1 + a2) = α1*n0 / (1 + α1) / (1 + a2)

[0059] According to the basic formula nt3 + a3*nq3 - (1 + a3)nj3 = 0 deformation, nt3 = nj1 = nt2

[0060] nt3 + a3*nj2 = (1 + a3)nj3, nq3 = nj2, n1 = nj3 = (nj1 + a3*nj2) / (1 + a3)

[0061] According to the following formula:

[0062] 1, n0 = (1 + a1) * nj1 / a1

[0063] 2, n1 = (nj1 + a3 * nj2) / (1 + a3)

[0064] 3, nj2 = nj1 / (1 + a2)

[0065] i3 = n0 / n1 = (1 + a1) * nj1 * (1 + a3 / a1 / (nj1 + a3 * nj1 / (1 + a2))

[0066] i3 = (1 + a1) * (1 + a3) / a1 * (1 + a3 / (1 + a2))

[0067] i3 = (1 + 2.318) * (1 + 2.314) / ((1 + 2.314 / (1 + 2.926)) * 2.318) = 2.98.

[0068] As Figure 5 : Four gears, brake Z1 and brake Z4 combination, P1 sun gear, P4 sun gear brake, input shaft and P1 ring gear connection, P1 planet carrier and P2 sun gear connection, P3 ring gear and P1 planet carrier connection, P3 planet carrier and P4 ring gear and output shaft connection. n0 = nq1, nt1 = 0, nj1 = nt3, nj3 = nq4 = n1, nt4 = 0, nq4 = n1.

[0069] According to the basic formula nt1 + a1 * nq1 - (1 + a1) * nj1 = 0 deformation

[0070] a1 * nq1 = (1 + a1) * nj1, a1 * n0 = (1 + a1) * nj1, nj1 = a1 * n0 / (1 + a1)

[0071] According to the basic formula nt3 + a3 * nq3 - (1 + a3) * nj3 = 0 deformation

[0072] nq3 = nj4, nj1 + a3 * nj4 = (1 + a3) * nj3 = (1 + a3) * n1

[0073] nt3 + a3 * nq3 = (1 + a3) * nj3, nt4 = 0

[0074] According to the basic formula nt4 + a4 * nq4 - (1 + a4) * nj4 = 0 deformation

[0075] a4 * nq4 = (1 + a4) * nj4, a4 * n1 = (1 + a4) * nj4

[0076] The main formula is as follows:

[0077] 1, a4*n1=(1+a4)nj4

[0078] 2, nj1= α1*n0 / (1+ α1)

[0079] 3, nj1+a3*nj4=(1+a3)nj3=(1+a3)n1

[0080] i4=n0 / n1=1+a3-a3*a4 / (1+a4))*(1+ α1) / α1

[0081] i4=(1+2.314-2.314*2.583 / (1+2.583))*(1+2.318) / 2.318=2.36.

[0082] As Figure 6 : five gears, brake L1 and brake Z2 combination, P2 gear ring brake. The input shaft is directly connected with P2 sun gear, P2 planet carrier is connected with P3 gear ring, and P3 planet carrier is connected with output shaft.

[0083] n0=nt2,nj2=nq3,nj3=n1,nq2=0

[0084] According to the basic formula nt2+a2*nq2-(1+a2)nj2=0 deformation

[0085] nt2=(1+a2)nj2,n0=(1+a2)nj2

[0086] According to the basic formula nt3+a3*nq3-(1+a3)nj3=0 deformation

[0087] nt3=nt2=n0

[0088] nj3=((1+a2)nj2+a3*nj2) / (1+a3)

[0089] i5=n0 / n1=nt2 / nj3=(1+a2)nj2*(1+a3) / ((1+a2)nj2+a3*nj2)

[0090] i5=(1+a2)*(1+a3) / (1+a2+a3

[0091] i5=(1+2.926)*1+2.314 / (1+2.926+2.314)=2.09.

[0092] As Figure 7: Sixth gear, clutch L1 and brake Z4 are engaged, P4 sun brake. The input shaft is directly connected with P3 sun, P2 planet carrier is connected with P3 ring, P3 planet carrier and P4 ring are connected with the output shaft.

[0093] n0=nt3,nj3=nq4=n1,nt4=0,nq3=nj4

[0094] According to the basic formula nt3+a3*nq3-(1+a3)nj3=0 deformation

[0095] n0=(1+a3)nj3-a3*nq3,n0=(1+a3)n1-a3*nq3

[0096] nq3=((1+a3)n1-n0) / a3

[0097] According to the basic formula nt4+a4*nq4-(1+a4)nj4=0 deformation,

[0098] a4*nq4=(1+a4)nj4,a4*n1=(1+a4)nq3,nq3=a4*n1 / (1+a4)

[0099] nq3=((1+a3)n1-n0) / a3=a4*n1 / (1+a4)

[0100] a4*n1*a3=(1+a4)*((1+a3)n1-n0)

[0101] (1+a4)*n0=(1+a3)(1+a4)*n1-a4*n1*a3,(1+a4)*n0=(1+a3+a4)*n1

[0102] i6=n0 / n1=(1+a3+a4) / (1+a4)=(1+2.314+2.583) / (1+2.583=1.65.

[0103] As Figure 8 shown, seven gear, brake Z1 and clutch L2 are engaged. The input shaft is connected with P1 ring, P1 sun brake, P1 planet carrier is directly connected with the output shaft.

[0104] n0=nq1,nt1=0,nj1=n1

[0105] According to the basic formula nt1+ α1*nq1-(1+ α1)nj1=0 deformation

[0106] α1*nq1=(1+ α1)nj1,n0=(1+ α1)nj1 / α1

[0107] n0 = (1 + α1) n1 / α1

[0108] i7 = n0 / n1 = (1 + α1) / α1 = (1 + 2.318) / (2.318 = 1.43

[0109] The detailed gear operating conditions and transmission ratios are shown in Table 1:

[0110] Table 1 Gear operating conditions and transmission ratios of the present application

[0111]

Claims

1. A high-power hydraulic transmission for fracturing operations, comprising a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, a torque converter, a first clutch, a first brake, a second clutch, a second brake, a third brake, and a fourth brake; characterized in that: The first planetary gear set includes a first gear ring, a first planet carrier, and a first sun gear; the second planetary gear set includes a second gear ring, a second planet carrier, and a second sun gear; the third planetary gear set includes a third gear ring, a third planet carrier, and a third sun gear; and the fourth planetary gear set includes a fourth gear ring, a fourth planet carrier, and a fourth sun gear. The first gear ring remains connected to the input component; The first clutch selectively connects the first sun gear to the input member, and the first brake selectively connects the first sun gear to the stationary member. The first planetary carrier is connected to the second sun gear and the third sun gear via a connecting member, and the connecting member is selectively connected to the second ring gear via a second clutch; The second brake causes the second gear ring to selectively engage with the fixed member; The second planetary carrier is connected to the third gear ring and the fourth planetary carrier via the second connecting member; The third brake causes the third gear ring to selectively connect with the fixed component; The third planetary carrier is connected to the fourth sun gear, and the fourth brake allows the output shaft to selectively connect to the third planetary carrier; The transmission establishes at least seven forward gear ratios; The seven forward gears include first gear. In first gear: the first brake and the third brake are engaged, the first sun gear and the third ring gear are braked, the input component and the first ring gear rotate synchronously, the first planet carrier and the third sun gear rotate synchronously, the output shaft and the third planet carrier rotate synchronously, and the gear ratio of the transmission is 4.

74. The seven forward gears include second gear. In second gear: the first clutch and the third brake are engaged, the third ring gear is braked, the input component and the third sun gear rotate synchronously, and the output shaft rotates synchronously with the third planetary carrier. The speed ratio of the transmission is 3.

31. The seven forward gears include three gears. In the third gear: the first brake and the second brake are engaged, the first sun gear and the second ring gear are braked, the input component and the first ring gear rotate synchronously, the first planet carrier and the second sun gear rotate synchronously, the second planet carrier and the third ring gear rotate synchronously, the output shaft and the third planet carrier rotate synchronously, and the gear ratio of the transmission is 2.

98. The seven forward gears include four gears. In fourth gear: the first brake and the fourth brake are engaged, the first sun gear and the fourth sun gear are braked, the input component rotates synchronously with the first ring gear, the first planet carrier and the second sun gear rotate synchronously, the third ring gear rotates synchronously with the first planet carrier, and the third planet carrier, the fourth ring gear and the output shaft rotate synchronously. The gear ratio of the transmission is 2.

36. The seven forward gears include five gears. In the fifth gear: the first brake and the second brake are engaged, the second ring gear is braked, the input component rotates synchronously with the second sun gear, the second planetary carrier and the third ring gear rotate synchronously, the third planetary carrier rotates synchronously with the output shaft, and the gear ratio of the transmission is 2.

09. The seven forward gears include six gears. In sixth gear: the first clutch and the fourth brake are engaged, the fourth sun gear is braked, the output shaft rotates synchronously with the third sun gear, the second planetary carrier rotates synchronously with the third ring gear, the third planetary carrier rotates synchronously with the fourth ring gear and the output shaft, and the gear ratio of the transmission is 1.

65. In seventh gear: the first brake and the second clutch are engaged, the input component is connected to the first ring gear, the first sun gear is braked, the first planetary carrier rotates synchronously with the output shaft, and the gear ratio of the transmission is 1.

43.

2. The high-power hydraulic transmission for fracturing operations as described in claim 1, characterized in that: The fixing component is the transmission housing.

3. The high-power hydraulic transmission for fracturing operations as described in claim 1, characterized in that: The first, second, third, and fourth planetary gear sets are all single-pole, single-row planetary gear sets.

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