Variable pitch system and equipment based on pressurized oil feeding

Abstract

The utility model relates to a variable pitch system and equipment based on pressurization oil supply, which comprises a pressurization part arranged in a cabin part of a wind driven generator, air overflow is avoided through pressurization, and gas overflow is reduced along with the change of oil. In order to realize rotation of the hub without rubber pipe winding, an oil slip ring connected with a pressurizing part pipeline is arranged in a main shaft part of the wind driven generator; a hydraulic control module connected with an oil slip ring pipeline is arranged in a hub part of the wind driven generator; the pressurizing part comprises an oil tank connected with the oil slip ring; the oil return pipeline and the oil inlet pipeline are connected with the oil slip ring. The device is reasonable in design, compact in structure and convenient to use.

Description

Technical Field

[0001] The utility model relates to a variable pitch system and equipment based on pressurized oil supply. Background Art

[0002] The wind turbine pitch control system adjusts the blade angle to adapt to the change of wind speed, so as to achieve effective use of wind energy and stable operation. The pitch control system generally adopts hydraulic system pitch control to achieve stable and reliable operation and can adjust the blade pitch angle.

[0003] When the oil tank is in the cabin, there are problems when oil is supplied through the oil slip ring: 1. The pipeline is long and the pressure loss is large; 2. The air bubbles in the oil circuit are not discharged effectively; 3. As a result, the hydraulic slip ring has a complex structure, large internal leakage, high cost, and is easy to get stuck.

[0004] How to solve the above technical problems has become a technical problem that needs to be solved urgently. Utility Model Content

[0005] The technical problem to be solved by the utility model is generally to provide a variable pitch system and equipment based on pressurized oil supply.

[0006] In order to solve the above problems, the technical solution adopted by the utility model is:

[0007] In order to reduce cavitation, a pitch control system based on pressurized oil supply includes a pressurized part arranged in the nacelle of the wind turbine, which avoids air overflow by pressurizing and reduces gas overflow as the oil changes.

[0008] In order to realize the rotation of the hub without causing the hose to be entangled, an oil slip ring connected to the booster part pipeline is arranged in the main shaft of the wind turbine;

[0009] A hydraulic control module connected to the oil slip ring pipeline is arranged in the hub of the wind turbine;

[0010] The booster section includes an oil tank connected to an oil sliding ring;

[0011] The oil tank has an oil return pipeline and an oil inlet pipeline connected to the oil sliding ring;

[0012] The oil tank adopts a positive pressure oil tank part and / or the oil tank is connected to the oil slip ring through a circulating motor pump group I.

[0013] As a further improvement of the above technical solution:

[0014] In order to realize the replenishment of oil to the execution system, the hydraulic control module includes a main motor pump group connected to the oil slip ring;

[0015] The outlet of the main motor pump group is respectively connected to the variable pitch valve group part and the accumulator part; the variable pitch valve group part is connected to the variable pitch control valve;

[0016] An outlet of the pitch control valve is connected to a rodless chamber of a pitch actuator through a pressure-maintaining valve;

[0017] The other outlet of the pitch control valve is connected to a rod chamber of a pitch actuator;

[0018] The accumulator part is connected to the pitch valve assembly part, and the pitch valve assembly part is connected to the blades arranged in the hub part.

[0019] In order to provide a reasonable positive pressure oil tank, the positive pressure oil tank part includes a fixing frame arranged in the cabin part; the oil tank body is arranged on the fixing frame;

[0020] A positive pressure hydraulic cylinder is arranged on the top of the fixed frame;

[0021] A piston portion is movable below the positive pressure hydraulic cylinder;

[0022] The piston part is in sealing contact with the inner wall of the oil tank body to form a positive pressure inner cavity for storing hydraulic oil.

[0023] In order to reduce the mixing of bubbles into the oil tank, a one-way valve B, a negative pressure part, a one-way valve A and an intermediate oil pump are arranged in sequence on the oil return pipeline.

[0024] An outer ring portion surrounding the oil tank body is arranged at the bottom of the fixing frame;

[0025] An upper cover portion located above the outer ring portion is arranged on the positive pressure hydraulic cylinder or the fixing frame, and the upper cover portion is smaller than the outer ring portion.

[0026] A front connecting frame is provided below the piston portion and is located in the inner cavity of the oil tank;

[0027] An isolation plate is arranged below the front connecting frame.

[0028] In order to achieve sedimentation and separation of debris, the isolation plate includes an outer frame connected to the front connecting frame;

[0029] The inner cavity of the outer frame is circular;

[0030] A hinge shaft is arranged at the center of the outer frame, and a buoyancy hollow fan blade is hinged on the hinge shaft;

[0031] A limit block is set on the outer frame.

[0032] A lateral groove is provided on the upper surface of the buoyancy hollow blade;

[0033] The lateral groove portion is oriented perpendicularly to the hinge axis.

[0034] In order to improve the existing wind turbine generator, the utility model provides a device, which comprises a nacelle part, a main shaft part and a hub part which are connected in sequence; and the above-mentioned system is mounted on the device.

[0035] The advantages of the utility model are as follows: 1. The oil sliding ring has low pressure and a low probability of leakage; 2. With the positive pressure oil tank, the hydraulic pump in the wheel hub can absorb oil smoothly, and there is no problem of poor oil absorption. 3. The cooler can use air cooling or water cooling to solve the problem of high temperature in the wheel hub. 4. It is convenient for refueling and maintenance in the cabin; 5. The variable pitch valve group has an accumulator, and the accumulator can cooperate with the proportional valve to achieve high-speed variable pitch. It can also provide power for emergency propeller adjustment. The utility model has a reasonable design, low cost, strong and durable, safe and reliable, simple operation, time-saving and labor-saving, money-saving, compact structure and easy use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the hydraulic principle of embodiment 1 of the utility model.

[0037] Figure 2 It is a schematic diagram of the hydraulic principle of embodiment 2 of the utility model.

[0038] Figure 3 It is a structural schematic diagram of embodiment 3 of the positive pressure oil tank of the present utility model.

[0039] Figure 4 It is a structural schematic diagram of embodiment 4 of the positive pressure oil tank of the present utility model.

[0040] Figure 5 It is a schematic diagram of the internal structure of the positive pressure oil tank of the utility model.

[0041] Figure 6 It is a schematic diagram of the oil tank body structure of the utility model.

[0042] Figure 7 It is a schematic diagram of the structure of the outer ring portion of the utility model.

[0043] Among them: 101, cabin part; 102, main shaft part; 103, hub part; 104, positive pressure oil tank part; 105, circulating motor pump group I; 106, oil slip ring; 107, main motor pump group; 108, pitch valve group; 109, pitch control valve; 110, pressure maintaining valve; 111, pitch actuator; 112, accumulator part; 113, fixed bracket; 114, check valve B; 115. Negative pressure part; 116. One-way valve A; 117. Intermediate oil pump; 118. Oil inlet pipeline; 119. Oil return pipeline; 120. Oil tank body; 121. Outer ring part; 122. Upper cover part; 123. Positive pressure hydraulic cylinder; 124. Piston part; 125. Front connecting frame; 126. Isolation plate; 127. Buoyancy hollow fan blade; 128. Lateral groove part; 129. Limit block. DETAILED DESCRIPTION

[0044] like Figure 1-7 As shown, the pitch control system and device based on pressurized oil supply of this embodiment, specifically, as Figure 1 , Figure 2 As shown, the pitch control system based on pressurized oil supply of this embodiment includes a pressurized part arranged in the nacelle 101 of the wind turbine;

[0045] In order to achieve rotation without causing hose entanglement, an oil slip ring 106 connected to the booster part pipeline is provided in the main shaft part 102 of the wind turbine;

[0046] A hydraulic control module connected to the oil slip ring 106 pipeline is provided in the hub portion 103 of the wind turbine generator, which can be an existing mature module to drive the pitch change;

[0047] The pressurizing part includes an oil tank connected to an oil sliding ring 106; it stores hydraulic oil.

[0048] For the convenience of description, the oil tank has conventional modules such as the oil return line 119 and the oil inlet line 118 connecting the oil sliding ring 106, as well as accessories such as sensors, liquid level gauges, thermometers, coolers, filters, etc.;

[0049] In order to avoid cavitation and reduce fluid loss caused by an excessively long fluid path, the present embodiment lists the following technical features: the oil tank adopts a positive pressure oil tank portion 104 and / or the oil tank is connected to the oil sliding ring 106 via a circulating motor pump group I105.

[0050] like Figure 1 , 2 The hydraulic control module includes a main motor pump group 107 connected to the oil slip ring 106; the main motor pump group 107 can replenish oil alone, or cooperate with the circulating motor pump group I105 to achieve joint oil supply to compensate for the pressure loss on the pipeline.

[0051] The outlet of the main motor pump group 107 is respectively connected to the pitch valve group part 108 and the accumulator part 112; the pitch valve group part 108 is connected to the pitch control valve 109;

[0052] An outlet of the pitch control valve 109 is connected to a rodless chamber of a pitch actuator 111 through a pressure-maintaining valve 110;

[0053] Another outlet of the pitch control valve 109 is connected to a rod chamber of a pitch actuator 111;

[0054] The accumulator part 112 is connected to the pitch valve assembly part 108 , and the pitch valve assembly part 108 is connected to the blades provided in the hub part 103 .

[0055] The accumulator part 112 is used as an oil supply component to realize oil supply and complete pressure compensation. Only when the accumulator pressure is lower than the set threshold value, the main motor pump group 107 is started to replenish oil.

[0056] The valve group is used to control, switch, maintain pressure and make emergency arrangements on the oil circuit.

[0057] The oil circuit is switched on and off by the pitch control valve assembly 108. The mid-position pressure maintenance and direction changing functions are realized by the pitch control valve 109.

[0058] The closed pressure maintaining and oil guiding are realized by the pressure maintaining valve 110 .

[0059] The built-in check valve of the reversing valve (not marked) with a shut-off valve is set in the opposite direction of the check valve to prevent oil return in the oil circuit and to enable conduction when emergency braking occurs.

[0060] Working principle: the oil is filled and stored in the oil tank (positive pressure oil tank part 104). When oil is needed, the main motor pump group 107 is started, and the oil passes through the oil sliding ring 106 to compensate the oil to the accumulator part 112, and the circulating motor pump group I105 can be started to reduce or balance the pipeline fluid loss.

[0061] As a specific working principle, the accumulator part 112 and / or the main motor pump group 107 can be used as the pitch power source to open the pitch valve group part 108, the pitch control valve 109, and the pressure maintaining valve 110, drive the pitch actuator 111 to operate, and return the oil to the oil tank (positive pressure tank part 104).

[0062] When braking is required, open the reversing valve to achieve conduction.

[0063] Among them, the nacelle part 101, the main shaft part 102, and the hub part 103 are basic components.

[0064] like Figure 3-7 As a specific improvement, the positive pressure oil tank part 104 includes a fixing frame 113 arranged in the cabin part 101; an oil tank body 120 is arranged on the fixing frame 113 to realize the storage of hydraulic oil.

[0065] As a parallel and / or combined solution, the fuel tank body 120 is filled with positive pressure gas (such as Figure 3 ) and / or a positive pressure hydraulic cylinder 123 is arranged on the top of the fixed frame 113 to maintain the positive pressure of the hydraulic oil.

[0066] Preferably, a positive pressure hydraulic cylinder 123 is provided on the top of the fixing frame 113; a piston part 124 is movable below the positive pressure hydraulic cylinder 123; preferably, it has a circular structure, which is easy to process and tightly sealed.

[0067] The piston portion 124 is in sealing contact with the inner wall of the oil tank body 120 to form a positive pressure inner cavity for storing hydraulic oil.

[0068] Preferably, there are two parallel paths on the oil return line 119 after passing through the reversing valve, one of which leads directly to the oil tank body 120, and on the other path of the oil return line 119, a one-way valve B114, a negative pressure part 115, a one-way valve A116 and an intermediate oil pump 117 are sequentially arranged. As a further improvement, in order to reduce the gas mixed into the oil tank, the utility model is provided with a pretreatment process, which extracts the gas mixed into the oil through a vacuum pump or through a negative pressure setting to achieve separation, and achieves reverse cutoff through a one-way valve to avoid gas reflux. Since the positive pressure tank pressure is greater than the negative pressure part 115, the utility model absorbs the oil through the oil after the gas is separated, and it can be started when the oil reaches the set amount.

[0069] During outdoor use, in order to prevent leakage caused by wear of the sealing ring, an outer ring portion 121 is provided at the bottom of the fixed frame 113 and surrounds the oil tank body 120; an upper cover portion 122 is provided on the positive pressure hydraulic cylinder 123 or the fixed frame 113 and is located above the outer ring portion 121 to prevent leakage of leaked oil. The upper cover portion 122 is smaller than the outer ring portion 121 and is used for diversion, thereby realizing temporary storage of overflow or leaked oil.

[0070] As a further improvement, in a high-pressure environment, wear is likely to occur and impurities are likely to be generated in the oil. A front connecting frame 125 located in the inner cavity of the oil tank body 120 is provided below the piston portion 124 for fixing. The result is not limited to the structure of the present utility model.

[0071] An isolation plate 126 is provided below the front connecting frame 125 , and the oil return pipeline 119 and the oil inlet pipeline 118 are located above the isolation plate 126 , which can reduce vibration and reduce the mixing of sediment.

[0072] The isolation tray 126 includes an outer frame connected to the front connecting frame 125, thereby serving as a supporting and fixed carrier.

[0073] The inner cavity of the outer frame is circular, which is easy to process and has good sealing performance.

[0074] A hinge shaft is provided at the center of the outer frame, and a buoyancy hollow blade 127 is hinged on the hinge shaft. The hollowing allows relatively small sediment to fall. When the piston moves downward, the resistance is small, avoiding oil fluctuations when moving downward, so that the sediment is lifted up.

[0075] A limit block 129 is provided on the outer frame to achieve limit, so that the buoyancy hollow fan blade swings in one direction and avoids swinging upward.

[0076] A lateral groove 128 is provided on the upper surface of the buoyancy hollow blade 127;

[0077] The lateral groove 128 is oriented perpendicularly to the hinge axis, thereby allowing the sediment to fall and reducing weight.

[0078] In order to expand the protection scope, the device of this embodiment includes a nacelle part 101, a main shaft part 102 and a hub part 103 connected in sequence; the above-mentioned system is mounted on the device.

[0079] With the support of the fixed frame 113, when the oil returns to the positive pressure oil tank, the oil enters the negative pressure part 115 through the one-way valve B114 in turn, and is left to stand in the negative pressure part 115. By pumping negative pressure, the gas and oil are separated and discharged. After the system circulates for a period of time, the path is closed and switched to a straight path without exhausting, reducing loss and heat generation. When the oil enters the oil tank body 120. With the circulation of the oil, the oil stored in the oil tank body 120 gradually becomes smaller, generating a vacuum, which causes the oil pump to work more heavily. To this end, the piston part 124 is driven downward by the positive pressure hydraulic cylinder 123 to reduce space and reduce the load on the oil pump.

[0080] The oil enters the intermediate oil pump 117 through the one-way valve A116, which draws the oil in the negative pressure part 115 out to the oil tank. During use, when leakage occurs, the oil is sprayed into the upper cover part 122 under the action of high pressure, and falls and is temporarily stored in the outer ring part 121 to avoid overflow; when there is sediment in the oil tank, it falls and accumulates through the buoyancy hollow fan blades 127. When a lot of sediment is accumulated on the buoyancy hollow fan blades 127, when cleaning, the isolation plate 126 is driven up and down by the positive pressure cylinder, so that the sediment falls to a certain extent.

[0081] The connection is achieved through the front connecting frame 125, the buoyancy of the buoyancy hollow fan blades 127 is reset, and the limiting is achieved through the limiting block 129.

[0082] The present invention is fully described for a clearer disclosure, and the prior art will not be listed one by one.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it; although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein with equivalents; it is obvious for those skilled in the art to combine multiple technical solutions of the utility model. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A variable pitch system based on pressurized oil supply, characterized in that: The invention comprises a pressurization part arranged in a nacelle (101) of a wind turbine; An oil slip ring (106) connected to a pipeline of a boosting part is arranged in the main shaft part (102) of the wind turbine; A hydraulic control module connected to an oil sliding ring (106) pipeline is provided in the hub portion (103) of the wind turbine generator; The pressurizing part includes an oil tank connected to an oil sliding ring (106); The oil tank has an oil return pipeline (119) and an oil inlet pipeline (118) connected to the oil sliding ring (106); The oil tank adopts a positive pressure oil tank part (104) and / or the oil tank is connected to an oil sliding ring (106) through a circulating motor pump group I (105).

2. The variable pitch system based on pressurized oil supply according to claim 1 is characterized in that: The hydraulic control module includes a main motor pump group (107) connected to the oil slip ring (106); The outlet of the main motor pump group (107) is respectively connected to the variable pitch valve group part (108) and the accumulator part (112); the variable pitch valve group part (108) is connected to the variable pitch control valve (109); An outlet of the pitch control valve (109) is connected to a rodless chamber of a pitch actuator (111) via a pressure-maintaining valve (110); The other outlet of the pitch control valve (109) is connected to a rod chamber of a pitch actuator (111); The accumulator part (112) is connected to the pitch control valve assembly part (108), and the pitch control valve assembly part (108) is connected to the blades arranged in the hub part (103).

3. The variable pitch system based on pressurized oil supply according to claim 1 or 2, characterized in that: The positive pressure oil tank section (104) comprises a fixing frame (113) arranged in the cabin section (101); an oil tank body (120) is arranged on the fixing frame (113); As a parallel and / or combined solution, positive pressure gas is added to the oil tank body (120) and / or a positive pressure hydraulic cylinder (123) is arranged on the top of the fixing frame (113).

4. The variable pitch system based on pressurized oil supply according to claim 3 is characterized in that: A piston part (124) is movable below the positive pressure hydraulic cylinder (123); The piston portion (124) is in sealing contact with the inner wall of the oil tank body (120) to form a positive pressure inner cavity for storing hydraulic oil.

5. The variable pitch system based on pressurized oil supply according to claim 4 is characterized in that: A check valve B (114), a negative pressure portion (115), a check valve A (116) and an intermediate oil pump (117) are sequentially arranged on the oil return pipeline (119).

6. The variable pitch system based on pressurized oil supply according to claim 4 is characterized in that: An outer ring portion (121) surrounding the oil tank body (120) is arranged at the bottom of the fixing frame (113); An upper cover portion (122) located above the outer ring portion (121) is provided on the positive pressure hydraulic cylinder (123) or the fixed frame (113), and the upper cover portion (122) is smaller than the outer ring portion (121).

7. The variable pitch system based on pressurized oil supply according to claim 6 is characterized in that: A front connecting frame (125) located in the inner cavity of the oil tank body (120) is arranged below the piston portion (124); An isolation plate (126) is provided below the front connecting frame (125); The oil return pipeline (119) and the oil inlet pipeline (118) are located above the isolation plate (126).

8. The variable pitch system based on pressurized oil supply according to claim 7 is characterized in that: The isolation plate (126) includes an outer frame connected to the front connecting frame (125); The inner cavity of the outer frame is circular; A hinge shaft is arranged at the center of the outer frame, and a buoyancy hollow fan blade (127) is hinged on the hinge shaft; A limit block (129) is arranged on the outer frame.

9. The variable pitch system based on pressurized oil supply according to claim 8 is characterized in that: A lateral groove (128) is provided on the upper surface of the buoyancy hollow blade (127); The lateral groove (128) is oriented perpendicularly to the hinge axis.

10. A device, characterized in that: The device comprises a nacelle part (101), a main shaft part (102) and a hub part (103) which are connected in sequence; the system according to any one of claims 1 to 9 is mounted on the device.

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