Simplified-control variable pitch assembly and system

Abstract

The utility model relates to a variable pitch assembly and system with simplified control. The variable pitch assembly comprises an energy accumulator assembly, a power assembly and an execution assembly. The power assembly is in pipeline connection with the energy accumulator assembly and the execution assembly; the energy accumulator assembly is connected with the execution assembly through an energy accumulator assembly pipeline; the execution assembly achieves reversing oil feeding through the power assembly. The power assembly has forward and reverse oil supply power. 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 component and a system with simplified control. Background Art

[0002] Wind turbines are widely used as green power generation equipment. Due to the uncertainty of wind direction and wind force, the blades of wind turbines need to be adjusted to achieve optimal adjustment, i.e. pitch control. Existing pitch control methods are divided into three categories: electromechanical and hydraulic. Electric control is easily interfered with, has high cost, mechanical installation assistance, and high failure rate. Therefore, hydraulic cylinder drive is generally used. However, hydraulic cylinder drive pitch control requires positive and negative direction drive to achieve opening and closing of the blades. For example, in the patent previously applied by the applicant, the existing operation generally uses a reversing valve to achieve control direction change.

[0003] In addition, the current open system is prone to cavitation, oil contamination, leakage and other problems, while the current closed system cannot effectively solve the volume difference problem between the rodless chamber and the rod chamber. Therefore, even if an accumulator is used, in order to ensure that the pressure value of the accumulator is greater than the set value, it is necessary to match monitoring components such as sensors. When problems occur in circuits such as sensors, major system failures will occur. Utility Model Content

[0004] The technical problem to be solved by the utility model is generally to provide a variable pitch component and system with simplified control.

[0005] To solve the above problems, the technical solution adopted by the utility model is: in order to simplify the control and reduce the volume, a variable pitch component with simplified control includes an oil tank part and a power component and an actuator component forming a closed-circuit system,

[0006] The power assembly pipeline is connected to the actuator assembly;

[0007] The power assembly has two-way oil supply power;

[0008] The oil tank section and the closed circuit system pipeline are used to replenish the oil to the closed circuit system;

[0009] The bidirectional hydraulic action of the power assembly drives the actuator to move forward and reversely. At the same time, corresponding high-pressure pipeline sides and low-pressure pipeline sides are formed on both sides of the power assembly.

[0010] When the pressure on the low-pressure pipeline side is lower than the set value or the pressure difference between the high-pressure pipeline side and the low-pressure pipeline side is greater than the set value, the oil tank part is connected to the low-pressure pipeline side to replenish oil.

[0011] As a further improvement of the above technical solution:

[0012] In order to realize the opening and closing of the propellers, the power assembly includes a bidirectional pump group;

[0013] The oil replenishment method includes active oil supply and / or self-priming oil supply; the oil tank can replenish oil by self-priming, or an oil replenishment pump can be added to replenish oil to the system.

[0014] When active oil supply is adopted, an oil supply pump is provided between the oil tank and the low-pressure pipeline side;

[0015] When self-priming oil supply is adopted, the pressure of the oil tank is higher than the pressure on the low-pressure pipeline side, and a one-way valve is installed on the pipeline between the oil tank and the low-pressure pipeline;

[0016] The actuator assembly has a rodless cavity side and a rod cavity side;

[0017] The rod chamber side is connected to the oil tank through a pipe k with a valve.

[0018] The closed circuit system also includes an accumulator assembly;

[0019] The accumulator components are connected to the power components and the actuator components by pipelines, and of course, also include valve groups, instruments, elbows and other components;

[0020] In order to achieve the omission of the slide valve, the power assembly has ports a and b;

[0021] Port a is connected to pipeline c, pipeline n and pipeline d respectively;

[0022] Pipeline c is connected to the accumulator assembly;

[0023] Pipeline d is connected to the actuator port A1;

[0024] Pipeline n is connected to the oil tank;

[0025] Port b is connected to pipeline k, pipeline m and pipeline e respectively;

[0026] Pipeline m is connected to the oil tank;

[0027] Pipeline e is connected to the actuator port B2.

[0028] As some small valve groups, the pitch control assembly has a control assembly; the control assembly includes a first one-way valve a arranged on the pipeline c, a fourth one-way valve m arranged on the pipeline m, and a third one-way valve i arranged on the pipeline n;

[0029] A first reversing valve d is arranged on the pipeline d;

[0030] A pipeline g bypassing the first check valve a is provided between the accumulator assembly port and the actuator assembly port A1; a second reversing valve g and / or a second check valve g is provided on the pipeline g.

[0031] A pipeline i connected in parallel with the pipeline n is connected between the other end of the port a and the oil tank; a parallel safety valve j and a stop valve j are arranged on the pipeline i.

[0032] A third reversing valve k is arranged on the pipeline k;

[0033] The pipeline d is connected to the oil tank through the sixth check valve q and the eighth relief valve;

[0034] The pipeline e is connected to the oil tank through the fifth one-way valve p and the seventh relief valve.

[0035] The bidirectional pump group is connected with a motor assembly; the motor assembly is electrically connected with an emergency power supply.

[0036] The accumulator assembly is connected to the rodless chamber side pipeline of the actuator assembly.

[0037] A variable pitch system with simplified control comprises the above-mentioned components.

[0038] The utility model simplifies the pitch control, eliminates the main control valve and other frequently operated components, solves the problem of unbalanced cylinder volume difference, and realizes comprehensive protection of the system through three safety valves. The bypass realizes energy balance and protects the pump group.

[0039] The utility model realizes functional control through a simple control component, eliminates the main valve body with frequent reversing, reduces liquid loss, simplifies pipelines and connecting joints, and at the same time, ensures that the volume of the rodless chamber and the rod chamber of the actuator is different, and the pipeline pressure difference cannot be released smoothly. The first check valve a realizes one-way control to avoid the rapid release of the stored pressure of the accumulator, which is supplemented by the second reversing valve g. The first reversing valve d is used to achieve rapid cut-off and the piston rod is retracted. The second check valve g realizes reverse cut-off, and the safety valve j realizes the protection of the hydraulic cylinder. The cut-off valve j realizes rapid emptying, the third check valve i realizes backflow prevention, the third reversing valve k realizes the coordination of propeller, the fifth check valve p, the sixth check valve q are preferably hydraulic control check valves, the seventh relief valve, and the eighth relief valve protect the safety of the circulation pipeline. The utility model has reasonable design, low cost, strong and durable, safe and reliable, simple operation, time-saving and labor-saving, money-saving, compact structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a hydraulic schematic diagram of an integral module of the utility model.

[0041] Figure 2 It is a schematic diagram of the oil-filled hydraulic pressure of the accumulator of the utility model.

[0042] Figure 3 It is a hydraulic schematic diagram of the paddle opening of the utility model.

[0043] Figure 4 It is a hydraulic schematic diagram of the paddle retracting of the utility model.

[0044] Figure 5 It is a schematic diagram of the emergency feathering structure of the utility model.

[0045] Figure 6 It is a schematic diagram of the optimal structure of the emergency feathering of the utility model.

[0046] Among them: 1. Oil tank part; 2. Accumulator assembly; 3. Power assembly; 4. Control assembly; 5. Actuator assembly; 6. Bidirectional pump group; 7. First one-way valve a; 8. First reversing valve d; 9. Second reversing valve g; 10. Second one-way valve g; 11. Safety valve j; 12. Stop valve j; 13. Third one-way valve i; 14. Third reversing valve k; 15. Fourth one-way valve m; 16. Fifth one-way valve p; 17. Sixth one-way valve q; 18. Seventh overflow valve; 19. Eighth overflow valve; 20. Emergency power supply. DETAILED DESCRIPTION

[0047] like Figure 1-6 As shown, the simplified control pitch control assembly and system of this embodiment are as follows: Figure 1 A simplified controlled pitch control assembly includes a fuel tank 1, a power assembly 3 and an actuator assembly 5, which are basic components; and an accumulator assembly 2 and other components. As a framework introduction, Figure 1 The power assembly 3 is connected to the accumulator assembly 2 and the actuator assembly 5 through the accumulator assembly 2 pipeline; the accumulator assembly 2 is connected to the actuator assembly 5 through the accumulator assembly 2 pipeline; the actuator assembly 5 realizes reversing oil supply through the power assembly 3; as an innovation, the power assembly 3 has forward and reverse oil supply power, thereby reducing the volume, simplifying the structure, reducing leakage, making the movement more flexible, and reducing liquid loss and pressure loss.

[0048] Preferably, the power assembly 3 includes a bidirectional pump group 6, so as to realize unidirectional driving of the motor and make the double pump ports a and b one in and one out or one out and one in, without the need for forward and reverse rotation of the motor, thereby simplifying the structure and avoiding leakage. The oil tank part 1 and the closed-circuit system pipeline are used to replenish oil to the closed-circuit system;

[0049] The bidirectional hydraulic action of the power assembly 3 drives the actuator 5 to move forward and reversely. At the same time, corresponding high-pressure pipeline sides and low-pressure pipeline sides are formed on both sides of the power assembly 3.

[0050] When the pressure on the low-pressure pipeline side is lower than the set value or the pressure difference between the high-pressure pipeline side and the low-pressure pipeline side is greater than the set value, the oil tank part 1 is connected to the low-pressure pipeline side to replenish oil.

[0051] The oil replenishment method includes active oil supply and / or self-priming oil supply;

[0052] When active oil supply is adopted, an oil supply pump is provided between the oil tank part 1 and the low-pressure pipeline side;

[0053] When self-priming oil supply is adopted, the pressure of the oil tank part 1 is higher than the pressure on the low-pressure pipeline side, and a one-way valve is provided on the pipeline between the oil tank part 1 and the low-pressure pipeline;

[0054] like Figure 2 , the power component 3 has port a and port b; realizing the optimal pipeline structure.

[0055] This is for the convenience of expression. Port a is connected to pipeline c, pipeline n and pipeline d respectively; in actual installation, it can be one or more pipelines or a valve block connection.

[0056] The pipeline c is connected to the accumulator assembly 2; the accumulator assembly 2 stores oil as energy storage, and its oil pressure is preferably higher than the pressure of the actuator cylinder, which can make up for the hydraulic pressure difference caused by the volume change of the rod chamber and the rodless chamber.

[0057] As a specific implementation scheme, pipeline d is connected to port A1 of actuator 5 to realize rodless cavity connection.

[0058] The pipeline n is connected to the oil tank part 1, and the oil tank is used to add hydraulic pressure to the hydraulic system;

[0059] Port b is connected to pipeline k, pipeline m and pipeline e respectively;

[0060] The pipeline m is connected to the oil tank part 1 to realize the replenishment of oil into the system and the accumulator;

[0061] Pipeline e is connected to port B2 of actuator 5, thereby achieving communication with the rod chamber.

[0062] The actuator 5 has a rodless cavity side and a rod cavity side;

[0063] The rod chamber side is connected to the oil tank part 1 through a pipeline k with a valve.

[0064] The pitch control assembly has a control assembly 4; the control assembly 4 includes a first one-way valve a7 arranged on the pipeline c, a fourth one-way valve m15 arranged on the pipeline m, and a third one-way valve i13 arranged on the pipeline n;

[0065] A first reversing valve d8 is provided on the pipeline d;

[0066] A pipeline g bypassing the first check valve a7 is provided between the port of the accumulator assembly 2 and the port A1 of the actuator assembly 5 .

[0067] A second reversing valve g9 and / or a second non-return valve g10 is provided on the pipeline g;

[0068] A pipeline i connected in parallel with the pipeline n is connected between the other end of the port a and the oil tank portion 1; a safety valve j11 and a stop valve j12 are provided in parallel on the pipeline i.

[0069] The control and switching of the liquid flow can be achieved through the setting of the valve group.

[0070] A third reversing valve k14 is provided on the pipeline k to realize emergency use and rapid retraction of the propellers.

[0071] The pipeline d is connected to the oil tank 1 through the sixth check valve q17 and the eighth relief valve 19, and the pipeline e is connected to the oil tank 1 through the fifth check valve p16 and the seventh relief valve 18. Excess oil can be returned to the oil tank to ensure the safety of the pipeline.

[0072] The accumulator assembly 2 is connected to the rodless chamber side pipeline of the actuator assembly 5, thereby realizing the storage of excess oil, which is very clever.

[0073] As an extended protection, a pitch control system with simplified control includes the above-mentioned components.

[0074] Combination Figure 2-5 , the operating principle is explained.

[0075] exist Figure 2 , start the power assembly 3, i.e. the bidirectional pump group 6, to the left, through the pipeline m, to replenish the oil and increase the pressure in the accumulator assembly 2 and / or the system. Figure 3 When the propeller needs to be opened, the bidirectional pump group 6 drives in the right reverse direction to retract the piston rod. Figure 4 , the bidirectional pump group 6 starts forward to the left to extend the piston rod. Figure 5 When emergency propeller adjustment is required, the second reversing valve g9 is activated. At the same time, the fourth one-way valve m15 is opened to return the oil directly to the relatively low-pressure oil tank part 1, so as to achieve rapid extension of the piston rod for propeller adjustment.

[0076] Since the changing volumes of the rod chamber and the rodless chamber are different, when too much oil is stored in the pipeline, for example, the piston rod is retracted, the hydraulically controlled one-way valve opens, allowing the oil to quickly return to the oil tank section 1.

[0077] The utility model realizes functional control through a simple control component 4, eliminating the need for a main valve body that frequently switches directions, reducing fluid loss, simplifying pipelines and connecting joints, and at the same time, ensuring that the volume of the rodless chamber and the rod chamber of the actuator component 5 is different, and the pipeline pressure difference cannot be released smoothly. The first one-way valve a7 realizes one-way control, realizes automatic oil replenishment and avoids rapid release of accumulator storage pressure, and realizes rapid retraction of the propeller through the second reversing valve g9. The two-way pump group 6 is connected to a motor component; the motor component is electrically connected to an emergency power supply 20, so as to realize Figure 6 Emergency paddle retraction.

[0078] The first reversing valve d8 is used to achieve rapid cut-off and the piston rod is retracted. The second one-way valve g10 is used to achieve reverse cut-off, and the safety valve j11 is used to protect the hydraulic cylinder. The cut-off valve j12 is used to achieve rapid venting, the third one-way valve i13 is used to prevent backflow and replenish oil in time, the third reversing valve k14 is used to cooperate with the propeller, the fifth one-way valve p16 and the sixth one-way valve q17 are preferably hydraulically controlled one-way valves, and the seventh relief valve 18 and the eighth relief valve 19 are used to protect the safety of the circulation pipeline.

[0079] In the shutdown state, the pressure of the rodless chamber of the cylinder is sealed by valve components 8, 9, and 10 to ensure that the cylinder is in a fully extended state.

[0080] The present invention is fully described for a clearer disclosure, and the prior art will not be listed one by one.

[0081] 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 assembly with simplified control, characterized in that: It comprises an oil tank part (1) and a power component (3) and an actuator component (5) forming a closed-circuit system. The power component (3) is connected to the execution component (5) through a pipeline; The power assembly (3) has a two-way oil supply power; The oil tank part (1) and the closed circuit system pipeline are used to replenish oil to the closed circuit system; The bidirectional hydraulic action of the power component (3) drives the actuator component (5) to move forward and reversely, and at the same time, a corresponding high-pressure pipeline side and a low-pressure pipeline side are formed on both sides of the power component (3); When the pressure on the low-pressure pipeline side is lower than a set value or the pressure difference between the high-pressure pipeline side and the low-pressure pipeline side is greater than a set value, the oil tank part (1) is connected to the low-pressure pipeline side to replenish oil.

2. The simplified controlled pitch assembly according to claim 1, characterized in that: The power assembly (3) includes a bidirectional pump assembly (6); The oil replenishment method includes active oil supply and / or self-priming oil supply; When active oil supply is adopted, an oil supply pump is arranged between the oil tank part (1) and the low-pressure pipeline side; When self-priming oil supply is adopted, the pressure of the oil tank (1) is higher than the pressure on the low-pressure pipeline side, and a one-way valve is arranged on the pipeline between the oil tank (1) and the low-pressure pipeline; The actuator (5) has a rodless cavity side and a rod cavity side; The rod chamber side is connected to the oil tank part (1) through a pipeline k with a valve.

3. The simplified controlled pitch assembly according to claim 1 or 2, characterized in that: The closed circuit system also includes an accumulator assembly (2); The accumulator assembly (2) is connected to the power assembly (3) and the actuator assembly (5) via pipelines; The power assembly (3) has an a port and a b port; Port a is connected to pipeline c, pipeline n and pipeline d respectively; Pipeline c is connected to the accumulator assembly (2); Pipeline d is connected to port A1 of actuator (5); The pipeline n is connected to the oil tank portion (1); Port b is connected to pipeline k, pipeline m and pipeline e respectively; The pipeline m is connected to the oil tank part (1); Pipeline e is connected to port B2 of actuator (5).

4. The simplified controlled pitch assembly according to claim 3, characterized in that: The pitch control assembly comprises a control assembly (4); the control assembly (4) comprises a first one-way valve a (7) arranged on a pipeline c, a fourth one-way valve m (15) arranged on a pipeline m, and a third one-way valve i (13) arranged on a pipeline n; A first reversing valve d (8) is provided on the pipeline d; A pipeline g bypassing the first one-way valve a (7) is provided between the port of the accumulator assembly (2) and the port A1 of the actuator assembly (5); A second reversing valve g (9) and / or a second non-return valve g (10) is arranged on the pipeline g.

5. The simplified controlled pitch assembly according to claim 4, characterized in that: A pipeline i connected in parallel with the pipeline n is connected between the other end of the port a and the oil tank part (1); a safety valve j (11) and a stop valve j (12) connected in parallel are arranged on the pipeline i.

6. The simplified controlled pitch assembly according to claim 5, characterized in that: A third reversing valve k (14) is provided on the pipeline k; The pipeline d is connected to the oil tank (1) through the sixth check valve q (17) and the eighth relief valve (19); The pipeline e is connected to the oil tank (1) through the fifth check valve p (16) and the seventh relief valve (18).

7. The simplified controlled pitch assembly according to claim 1, characterized in that: The bidirectional pump group (6) is connected to a motor assembly; the motor assembly is electrically connected to an emergency power supply (20).

8. The simplified controlled pitch assembly according to claim 7, characterized in that: The accumulator assembly (2) is connected to the rodless chamber side pipeline of the actuator assembly (5).

9. A variable pitch system with simplified control, characterized in that: The invention comprises the component according to any one of claims 1 to 8.

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