Electromagnetic directional valve for fan yaw hydraulic system

Abstract

The utility model relates to the technical field of hydraulic control, in particular to an electromagnetic directional valve for a yaw hydraulic system of a fan, which is good in sealing performance and high in reliability. Comprising a valve body internally provided with a containing space, and an inlet and an outlet which are communicated with each other are formed in the valve body; the valve element is installed in the containing space, and the valve element can only slide in the containing space in the radial direction; the electromagnet is arranged on the outer side of the containing space and generates electromagnetic force after being powered on to drive the valve element to move. The spring is installed between the valve element and the end of the valve body, and when the electromagnet is powered off, the valve element is reset to the initial position; the sealing assembly comprises a protruding part arranged on the inner side of the containing space, an impact pad arranged at the bottom of the valve element and a first sealing ring arranged on the outer side of the impact pad. And when the impact pad slides to the bottom of the accommodating space, the separation between the inlet and the outlet is realized through the contact deformation of the first sealing ring and the protruding part.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydraulic control, in particular to a kind of electromagnetic reversing valve for fan yaw hydraulic system. BACKGROUND

[0002] Fan yaw hydraulic system is an important component in wind turbine generator system, which is responsible for rotating the nacelle of the fan according to the change of wind direction to ensure that the blades of the fan are always at the best wind-attacking angle, thereby maximizing the efficiency of wind energy capture. The yaw hydraulic system usually consists of a hydraulic pump, a hydraulic motor or a cylinder, control valves, accumulators and sensors. The system provides pressure oil to the hydraulic motor or cylinder through the hydraulic pump, drives the gear to rotate, and then drives the nacelle to rotate relative to the tower. The control valve is used to adjust the direction and flow of hydraulic oil to control the speed and direction of yaw. The accumulator is used to store energy to ensure that sufficient hydraulic power can be provided quickly when needed.

[0003] To avoid the pressure of the hydraulic system from decreasing too quickly and to enable the hydraulic station to operate for a long time, the original one-way valve installed on the valve island is replaced by a two-position two-way electromagnetic reversing valve. The magnetic core of the existing electromagnetic reversing valve relies on a metal flat hard sealing method to achieve its function. However, during long-term use, when the outside pressure fluctuates, if corrosion or impurity dirt accumulates on the contact surface, the sealing performance is poor, which leads to poor performance of the electromagnetic control valve. SUMMARY

[0004] To solve the above technical problems, the utility model provides an electromagnetic reversing valve for fan yaw hydraulic system, which has good sealing performance and high reliability.

[0005] The electromagnetic reversing valve for fan yaw hydraulic system of the utility model comprises:

[0006] A valve body is provided with a containing space inside, and an inlet and an outlet are formed on the valve body and are in communication with each other.

[0007] A valve core is installed in the containing space and can only slide radially in the containing space. An electromagnet is arranged outside the containing space and generates electromagnetic force after being energized to drive the valve core to move.

[0008] A spring is installed between the valve core and the end of the valve body, and when the electromagnet is de-energized, the valve core is reset to the initial position.

[0009] A sealing assembly comprises a protruding part arranged inside the containing space, an impact pad arranged at the bottom of the valve core, and a first sealing ring arranged outside the impact pad. When the impact pad slides to the bottom of the containing space, the first sealing ring and the protruding part are in contact and deformed to achieve the separation between the inlet and the outlet.

[0010] Further, the inner wall diameter of the protruding part gradually increases from top to bottom, the outer wall diameter of the impact pad gradually decreases from top to bottom, and the small diameter end a of the impact pad is smaller than the small diameter end c of the protruding part, and the large diameter end b of the impact pad is larger than the large diameter end d of the protruding part.

[0011] Further, the first sealing ring is provided in plurality, and the plurality of first sealing rings are distributed radially along the outer wall of the impact pad.

[0012] Further, a ring-shaped groove is arranged outside the impact pad, the first sealing ring is embedded in the groove, and the first sealing ring protrudes from the outer surface of the impact pad.

[0013] Further, the impact pad and the valve core are detachably connected through the fixing part, and the second sealing ring is arranged at the contact position of the impact pad and the valve core.

[0014] Further, the first sealing ring and the second sealing ring are both O-shaped sealing rings.

[0015] Further, the first sealing ring and the second sealing ring are both made of high-temperature-resistant and corrosion-resistant materials.

[0016] Further, the utility model also comprises a wiring seat, and the wiring seat is electrically connected with the electromagnet.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] By arranging the sealing assembly, when the valve core slides to the bottom of the accommodating space, the first sealing ring is in contact with the protruding part and deforms, thereby forming a tight sealing surface, realizing effective isolation between the inlet and the outlet, avoiding the problem of tight sealing caused by corrosion or impurity accumulation due to metal plane hard sealing, reducing the sensitivity to external environmental factors (such as pressure fluctuation), improving the reliability and stability of the electromagnetic reversing valve in long-term use, and ensuring the normal operation of the fan yaw system. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further described below in combination with the drawings.

[0020] Figure 1 is the structure schematic diagram of the utility model;

[0021] Figure 2 is the overhead structure schematic diagram of the utility model;

[0022] Figure 3 is Figure 2 the sectional structure schematic diagram of A-A part in figure 1;

[0023] Figure 4 is Figure 3 the enlarged structure schematic diagram of B part in figure 1;

[0024] Marked in the drawing: 1, valve body; 11, accommodation space; 12, inlet; 13, outlet; 2, valve core; 3, electromagnet; 4, spring; 5, sealing assembly; 51, protruding part; 52, impact pad; 53, first sealing ring; 54, fixing piece; 6, terminal block. DETAILED DESCRIPTION

[0025] The specific embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

[0026] As Figures 1 to 4 shown, a kind of electromagnetic reversing valve for fan drift hydraulic system of the utility model, comprising:

[0027] Valve body 1, accommodation space 11 is provided in valve body 1 interior, inlet 12 and outlet 13 of being mutually communicated are set on valve body 1;

[0028] Valve core 2, is installed in accommodation space 11, valve core 2 can only slide in radial direction in accommodation space 11;

[0029] Electromagnet 3, is located in accommodation space 11 outside, generates electromagnetic force after energization, drives valve core 2 to move;

[0030] Spring 4, is installed between valve core 2 and valve body 1 end portion, when electromagnet 3 is powered off, make valve core 2 reset to initial position;

[0031] Sealing assembly 5, including the protruding part 51 of being arranged in accommodation space 11 inner side, the impact pad 52 of being arranged in valve core 2 bottom and the first sealing ring 53 of being installed in impact pad 52 outside;When impact pad 52 slides to the bottom of accommodation space 11, the isolation between inlet 12 and outlet 13 is realized by the contact deformation of first sealing ring 53 and protruding part 51;

[0032] The valve core 2 can only slide radially in the accommodation space 11, simplifying the movement mode and reducing the failure caused by complex movement; by energizing the electromagnet 3, the electromagnet 3 generates an electromagnetic force acting on the valve core 2, causing it to move radially, thereby changing the communication state between the inlet 12 and the outlet 13, and in this process, the spring 4 is compressed; when the electromagnet 3 is de-energized, the electromagnetic force of the electromagnet 3 disappears, the attraction between the valve core 2 and the electromagnet 3 is disconnected, the spring 4 is elongated, and the force of the spring 4 pushes the valve core 2 back to the initial position, restoring the original flow path state, which ensures that the valve can automatically return to the safe position even in the case of power failure; Since the electromagnet 3 directly controls the position change of the valve core 2 as the power source, this type of directional valve usually has a faster action speed and can quickly respond to the instructions issued by the control system, suitable for hydraulic systems that need to frequently adjust the direction or state; The sealing assembly 5 ensures that when the valve core 2 moves to the limit position, the first sealing ring 53 is in contact with the protruding part 51 and deforms to completely cut off the communication between the inlet 12 and the outlet 13, which effectively prevents leakage and improves the reliability and efficiency of the system; The entire electromagnetic directional valve adopts a compact design, so it can adapt to applications with limited installation space.

[0033] The inner wall diameter of the protruding part 51 gradually increases from top to bottom, the outer wall diameter of the impact pad 52 gradually decreases from top to bottom, and the small diameter end a of the impact pad 52 is smaller than the small diameter end c of the protruding part 51, and the large diameter end b of the impact pad 52 is larger than the large diameter end d of the protruding part 51; The protruding part 51 forms an inverted conical structure, and the impact pad 52 forms an upright conical structure, and the size relationship between the two components ensures that there is enough gap between them when the valve core 2 is in the non-working position, without affecting the free movement of the valve core 2, and when the valve core 2 is driven to the bottom position, the impact pad 52 approaches the protruding part 51 and deforms through the first sealing ring 53, thereby tightly fitting and forming an effective seal; Since the two conical surfaces will naturally guide each other to align the center line, even if there is some manufacturing error or installation deviation, it can also ensure good sealing quality; Compared with flat sealing, conical sealing can obtain larger sealing force in a smaller stroke range.

[0034] The first sealing ring 53 is arranged in multiple numbers, and the multiple first sealing rings 53 are distributed radially at intervals along the outer wall of the impact pad 52; through the joint action of multiple sealing rings, a multi-layer sealing barrier is formed, even if one of the sealing rings fails due to long-term use or abnormal conditions, the other sealing rings can still continue to function, ensuring the sealing and safety of the system; multiple sealing rings can more evenly distribute the pressure on the sealing surface, reducing the unit area pressure borne by each sealing ring, thereby prolonging the service life of the sealing element and reducing the risk of leakage of the sealing surface; the sealing rings at different positions can compensate for the dimensional tolerance during manufacturing and assembly to some extent, making the sealing more reliable, even if there is slight unevenness or deviation in some parts, the multi-layer sealing structure can ensure that the overall sealing performance is not affected; when the temperature changes, the material may expand or shrink, the multi-layer sealing design can better adapt to these changes, maintain stable sealing effect, and prevent leakage problems caused by thermal expansion and contraction.

[0035] The impact pad 52 is provided with an annular groove on the outside, the first sealing ring 53 is embedded in the groove, and the first sealing ring 53 protrudes from the outer surface of the impact pad 52; through the design of the annular groove, the first sealing ring 53 can be firmly embedded on the impact pad 52, avoiding the sealing ring from falling off or shifting due to movement or pressure changes; the protruding sealing ring part ensures the sealing pressure and deformation ability when contacting the protruding part 51, ensuring the reliability of the sealing.

[0036] The impact pad 52 is detachably connected to the valve core 2 through the fixing part 54, and the contact part of the impact pad 52 and the valve core 2 is provided with a second sealing ring; through the design of the fixing part 54, the impact pad 52 can be quickly and accurately installed on the valve core 2, when the impact pad 52 needs to be maintained or replaced, the impact pad 52 can be easily removed by loosening the fixing part 54, simplifying the maintenance process, and the second sealing ring ensures that there is no leakage from the joint between the impact pad 52 and the valve core 2.

[0037] Preferably, the first sealing ring 53 and the second sealing ring are both O-shaped sealing rings; the O-shaped sealing ring is a ring-shaped elastomer with an O-shaped cross-section, which can realize sealing through its own elastic deformation when installed in a groove or hole, suitable for static sealing (such as the sealing between the impact pad 52 and the valve core 2) and dynamic sealing (such as the sealing between the impact pad 52 and the protruding part 51), and can work in a wide range of pressure and temperature, providing reliable sealing effect.

[0038] Preferably, the first sealing ring 53 and the second sealing ring are both made of high-temperature-resistant and corrosion-resistant materials; in the fan yaw hydraulic system, the temperature of the hydraulic oil may rise due to long-time operation or environmental factors, and the high-temperature-resistant material can ensure that the sealing ring can still work effectively in a high-temperature environment, avoiding sealing failure caused by material softening or aging; there may be moisture, chemical additives or other corrosive substances in the hydraulic system, and the corrosion-resistant material can effectively prolong the service life of the sealing ring and reduce leakage problems caused by corrosion; the selection of high-temperature-resistant and corrosion-resistant materials can significantly improve the durability and reliability of the sealing ring, reduce the maintenance frequency and failure rate, and ensure long-term stable operation of the system.

[0039] The electromagnet 3 is the core component for driving the valve core 2 to move, and the operation of the electromagnet 3 depends on stable current supply, so the wiring seat 6 is also included, which is electrically connected with the electromagnet 3; the wires of the external power supply or control system are connected with the coil of the electromagnet 3 through the wiring seat 6 to form a complete circuit, ensuring that the current can be smoothly conducted to the electromagnet 3, so that it generates the necessary electromagnetic force to drive the valve core 2 to move; the wiring seat 6 ensures good contact between the wires and the electromagnet 3 through a reliable connection method (such as screw fixation, plug-in connection, etc.), reduces the contact resistance, and avoids unstable current or insufficient electromagnetic force caused by poor contact.

[0040] The utility model discloses a kind of electromagnetic reversing valves for fan yaw hydraulic system, when electromagnet 3 is not electrified, valve core 2 is in initial position under the action of spring 4, fluid passage between inlet 12 and outlet 13 is in isolated state, when control system sends instruction to electromagnetic reversing valve, electromagnet 3 is electrified, electromagnet 3 generates electromagnetic force after electrification, drive valve core 2 to overcome the elasticity of spring 4, slide radially in containing space 11, drive impact pad 52 to move to the top of containing space 11, impact pad 52 is separated from protruding part 51, first sealing ring 53 restores original shape, fluid passage between inlet 12 and outlet 13 is in communication state;When needing to reset, control system sends power-off instruction to electromagnetic reversing valve, after electromagnet 3 is powered off, electromagnetic force disappears, valve core 2 slides radially in containing space 11 under the action of spring 4, drive impact pad 52 to move to the bottom of containing space 11, when impact pad 52 slides to the bottom of containing space 11, first sealing ring 53 is contacted with protruding part 51 and deforms, forms sealing barrier, simultaneously, second sealing ring plays a role at the contact of impact pad 52 and valve core 2, prevent fluid from leaking from connecting portion;Electromagnetic reversing valve returns to initial state, waits for next control instruction;The movement of valve core 2 changes the fluid passage state between inlet 12 and outlet 13 (from communication to isolation, or from isolation to communication), so that the reversing function of hydraulic system is realized;If electromagnet 3 is accidentally powered off, spring 4 will immediately push valve core 2 to reset, to ensure that the system returns to safe state.

[0041] The electromagnetic reversing valve for the hydraulic system of the fan yawing is provided with the installation mode, the connection mode or the setting mode, and can achieve the beneficial effects.

[0042] The above is only the preferred embodiment of the present application, and it should be pointed out that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. An electromagnetic reversing valve for a hydraulic system of a wind turbine yawing, characterized in that, The utility model relates to a valve, which comprises: a valve body (1) provided with a containing space (11) inside, an inlet (12) and an outlet (13) being communicated with each other on the valve body (1); a valve core (2) installed in the containing space (11), which can only slide radially in the containing space (11); a spring (4) installed between the valve core (2) and the end of the valve body (1), which makes the valve core (2) return to the initial position when the electromagnet (3) is powered off; a sealing assembly (5) comprising a protruding part (51) provided inside the containing space (11), an impact pad (52) provided at the bottom of the valve core (2), and a first sealing ring (53) installed outside the impact pad (52); when the impact pad (52) slides to the bottom of the containing space (11), the first sealing ring (53) deforms by contacting the protruding part (51) to achieve the isolation between the inlet (12) and the outlet (13).

2. The electromagnetic direction valve for a hydraulic system of a wind turbine yawing according to claim 1, characterized in that, The inner wall diameter of the protruding part (51) gradually increases from top to bottom, the outer wall diameter of the impact pad (52) gradually decreases from top to bottom, and the small diameter end a of the impact pad (52) is smaller than the small diameter end c of the protruding part (51), and the large diameter end b of the impact pad (52) is larger than the large diameter end d of the protruding part (51).

3. The electromagnetic direction valve for a hydraulic system of a wind turbine yawing according to claim 1, characterized in that, The first sealing ring (53) is provided in multiple, and multiple first sealing rings (53) are distributed radially along the outer wall of the impact pad (52).

4. The electromagnetic direction valve for a hydraulic yaw system of a wind turbine according to claim 1, characterized in that The impact pad (52) is provided with an annular groove outside, the first sealing ring (53) is embedded in the groove, and the first sealing ring (53) protrudes from the outer surface of the impact pad (52).

5. The electromagnetic direction valve for a hydraulic yaw system of a wind turbine according to claim 1, characterized in that The impact pad (52) and the valve core (2) are detachably connected through a fixing part (54), and the impact pad (52) and the valve core (2) are provided with a second sealing ring at the contact position.

6. The electromagnetic direction valve for a hydraulic yaw system of a wind turbine according to claim 5, characterized in that The first sealing ring (53) and the second sealing ring are both O-shaped sealing rings.

7. The electromagnetic direction valve for a hydraulic yaw system of a wind turbine according to claim 5, characterized in that The first sealing ring (53) and the second sealing ring are both made of high-temperature-resistant and corrosion-resistant materials.

8. The electromagnetic direction valve for a hydraulic yaw system of a wind turbine according to claim 1, characterized in that The utility model also comprises a wiring seat (6) electrically connected with the electromagnet (3).

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