Servo valve with dredging structure

Abstract

The utility model discloses a servo valve with a dredging structure, which comprises a valve body, an oil inlet is arranged in the valve body, a first cavity is further arranged in the valve body, the first cavity is arranged on one side of the oil inlet, a second cavity is arranged on one side, opposite to the first cavity, of the oil inlet, and a first flow channel is further arranged in the valve body. The first filter screen is arranged in the oil inlet; the hydraulic component comprises a push plate arranged in the first cavity in a sliding mode, a first elastic unit is further arranged between the push plate and the first cavity, the first cavity communicates with an inlet of the first flow channel, and the hydraulic component further comprises a push component arranged in the first flow channel; the separating part is arranged at the communicating position between the top of the second cavity and the oil inlet; according to the utility model, when the interior of the valve body is blocked, impurities attached to the first filter screen are scraped and stored in the second chamber through the matching between the hydraulic component and the separation component, so that the frequency of manual maintenance is reduced, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of servo valves, in particular to a servo valve with a dredging and blocking structure. Background Art

[0002] The servo valve is a key actuator widely used in the field of automated control. Among them, the electro-hydraulic servo valve is one of the key components that converts electrical signals into hydraulic power control. It can provide higher accuracy, response speed and reliability for the control system in the fields of electronic control and mechanical design.

[0003] In actual operation, it is necessary to inject pressurized oil into the oil circuit of the electro-hydraulic servo valve, and then energize the control coil to drive the movable armature to rotate, thereby causing the feedback rod to deflect and form an oil pressure difference in the oil circuit to drive the valve core to move, thereby controlling the connection between different oil holes. When the electro-hydraulic servo valve has been working for a long time, impurities in the pressurized oil will accumulate and clog the oil circuit, affecting the operation of the servo valve and even damaging the valve core. Usually, the servo valve needs to be manually disassembled and cleaned. However, due to the relatively delicate structure of the servo valve, manual disassembly and cleaning is more troublesome and increases the labor intensity. Therefore, this application specifically proposes a servo valve with a blockage-relieving structure that can self-clean when a blockage occurs in the servo valve. Utility Model Content

[0004] The main purpose of the utility model is to provide a servo valve with a blockage-relieving structure which can self-clean when blockage occurs in the electromagnetic valve.

[0005] To achieve the above-mentioned purpose, the utility model provides a servo valve with a blockage-relieving structure, comprising:

[0006] a valve body, wherein an oil inlet for receiving pressurized oil is defined in the valve body, a first chamber is further defined in the valve body, the first chamber stores a pressure transmission medium and is disposed on one side of the oil inlet, a second chamber for storing impurities is defined on a side of the oil inlet opposite to the first chamber, the second chamber is communicated with the oil inlet, a first flow channel is further defined in the valve body, and an outlet of the first flow channel is communicated with the oil inlet;

[0007] a first filter screen disposed in the oil inlet, the first filter screen being used to prevent impurities in the pressure oil from entering the oil path of the servo valve;

[0008] a hydraulic component comprising a push plate slidably disposed in the first chamber, the push plate being dynamically sealed with the first chamber, a first elastic unit being disposed between the push plate and the first chamber, the first elastic unit applying a thrust to the push plate in a direction toward the oil inlet, an end of the first chamber away from the oil inlet being in communication with an inlet of the first flow channel, the first flow channel being used to convey a pressure transmission medium, and a pushing member disposed at an outlet of the first flow channel, the pushing member being used to scrape off impurities clogged at the bottom of the first filter screen when the push plate moves in a direction away from the oil inlet;

[0009] A partition component is provided at the connection between the top of the second chamber and the oil inlet, and is provided corresponding to the pushing member. When the pushing member is cleaning impurities, the partition component is used to control the connection and disconnection between the top of the oil inlet and the second chamber.

[0010] Furthermore, a groove is formed on the valve body, and the groove is arranged on a side of the oil inlet close to the first filter screen;

[0011] The pushing member includes a push rod arranged at the outlet of the first flow channel in a direction close to or away from the partition component, the push rod is in dynamic sealing cooperation with the first flow channel, a scraper is provided at one end of the push rod close to the partition component, the scraping surface of the scraper corresponds to the filtering surface of the first filter screen, when pressure oil is being input into the servo valve, the scraper is inserted into the groove to avoid the scraper interfering with the operation of the oil inlet, a second elastic unit is provided between the end of the push rod away from the scraper and the first flow channel, the second elastic unit applies a pulling force to the push rod in the direction away from the partition component.

[0012] Furthermore, the partition component includes a side plate arranged at the connection point between the second chamber and the oil inlet, and an inclined surface is provided at the top end of the side plate. A partition plate is also provided above the side plate. The partition plate is arranged opposite to the scraper and is rotatably connected to the valve body. Another inclined surface corresponding to the inclined surface of the side plate is provided on the partition plate. A torsion spring is provided at the rotational connection between the partition plate and the valve body, and the torsion spring applies a torsional force to the partition plate to rotate downward.

[0013] Furthermore, a second flow channel is further provided in the valve body, one end of the second flow channel is communicated with the bottom end of the second chamber, and the other end of the second flow channel is communicated with the oil inlet;

[0014] A collecting component is provided in the second chamber, and the collecting component includes a second filter screen arranged in the second chamber. The second filter screen is arranged above the bottom end of the second chamber. The second filter screen is used to prevent impurities from flowing back to the oil inlet 11 through the second flow channel. The pressure oil in the second chamber can flow back to the oil inlet through the second flow channel.

[0015] Furthermore, a notch communicating with the second chamber is formed on one side of the valve body, and screw holes are formed on both sides of the notch;

[0016] The valve body is also provided with a sealing assembly, which includes a sealing plate arranged at the notch, and a group of through holes corresponding one to one with the screw holes on the valve body are provided on the sealing plate. The sealing plate is also provided with a sealing block corresponding to the shape of the notch at one end close to the valve body, and the sealing block is used to seal the notch.

[0017] The beneficial effects of the present invention are as follows:

[0018] According to the utility model, when a blockage occurs in the valve body, impurities attached to the first filter screen are scraped off and stored in the second chamber through the cooperation between the hydraulic component and the separation component, so that the servo valve has a self-cleaning function when blocked, reducing the frequency of manual maintenance and the labor intensity of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional view of the front of the servo valve with a blockage-relieving structure according to the present invention;

[0020] Figure 2 This is a cross-sectional view of the servo valve with a blockage-relieving structure according to the present invention;

[0021] Figure 3 yes Figure 2 Magnified view at point A in the middle;

[0022] Figure 4 yes Figure 2 Magnified view at point B in the middle;

[0023] Figure 5 is a structural view of the sealing component.

[0024] Description of reference numerals:

[0025] 1. Valve body; 11. Oil inlet; 12. First chamber; 13. Second chamber; 14. First flow channel; 15. Groove; 16. Second flow channel; 17. Notch; 18. Screw hole; 2. First filter; 3. Hydraulic component; 31. Push plate; 32. First elastic unit; 33. Pushing member; 331. Push rod; 332. Scraper; 333. Second elastic unit; 4. Partition component; 41. Side plate; 42. Partition plate; 5. Collecting component; 51. Second filter; 52. One-way valve; 53. Sealing assembly; 531. Sealing plate; 532. Through hole; 533. Sealing block. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0027] See also Figure 1-Figure 5 .

[0028] The utility model discloses a servo valve with a blockage-relieving structure, comprising:

[0029] A valve body 1 is provided with an oil inlet 11 for receiving pressurized oil. A first chamber 12 is further provided in the valve body 1. The first chamber 12 stores a pressure transmission medium and is disposed on one side of the oil inlet 11. A second chamber 13 for storing impurities is provided on a side of the oil inlet 11 opposite the first chamber 12. A first flow channel 14 is further provided in the valve body 1, and an outlet of the first flow channel 14 is communicated with the oil inlet 11.

[0030] A first filter 2 is provided in the oil inlet 11 and is used to prevent impurities in the pressurized oil from entering the oil path of the servo valve;

[0031] The hydraulic component 3 includes a push plate 31 slidably disposed in the first chamber 12, the push plate 31 being dynamically sealed with the first chamber 12, a first elastic unit 32 being provided between the push plate 31 and the first chamber 12, the first elastic unit 32 applying a thrust to the push plate 31 in a direction toward the oil inlet 11, an end of the first chamber 12 remote from the oil inlet 11 being connected to an inlet of a first flow channel 14, the first flow channel 14 being used to convey a pressure-transmitting medium, and a pushing member 33 disposed at an outlet of the first flow channel 14, which is used to scrape away impurities clogging the bottom of the first filter 2 when the push plate 31 moves in a direction away from the oil inlet 11;

[0032] The partition component 4 is arranged at the connection between the top of the second chamber 13 and the oil inlet 11, and is arranged corresponding to the pushing member 33. When the pushing member 33 cleans impurities, the partition component 4 is used to control the connection and disconnection between the top of the oil inlet 11 and the second chamber 13.

[0033] In a specific implementation, when the servo valve is working, the pressure oil enters the oil circuit from the oil inlet 11 through the first filter 2. The first filter 2 intercepts impurities in the pressure oil, thereby preventing impurities from entering the oil circuit of the servo valve. At this time, the first elastic unit 32 applies a thrust to the push plate 31 in the direction close to the oil inlet 11, and prevents the pressure oil from driving the push plate 31 to move away from the oil inlet 11. After the servo valve has been working for a long time, impurities in the pressure oil accumulate at the first filter 2 and block the first filter 2. At this time, the oil circuit is broken, and the oil inlet 11 is still delivering oil. At this time, the pressure of the pressure oil at the oil inlet 11 increases and squeezes the push plate 31. The pressure oil applies a thrust to the push plate 31 in the direction away from the oil inlet 11 and enters the first chamber 12. At this time, the first elastic unit 32 is compressed, and the pressure transmission medium is It is squeezed and flows into the first flow channel 14 until the pressure transmission medium squeezes the pushing member 33 and moves the pushing member 33 toward the oil inlet 11, thereby scraping off and driving the impurities attached to the first filter 2 to move until the impurities contact the partition component 4. As the pushing member 33 continues to move, the partition component 4 connects the oil inlet 11 with the second chamber 13, and the impurities enter the second chamber 13. At this time, the first filter 2 is unblocked, and the pressure of the pressure oil at the oil inlet 11 gradually decreases until it reaches a predetermined value. The first elastic unit 32 drives the push plate 31 to move toward the oil inlet 11 and pushes the pressure oil out of the first chamber 12. The pressure transmission medium flows back into the first chamber 12, and the pushing member 33 moves toward the first flow channel 14 until the pushing member 33 is reset, completing the unblocking.

[0034] According to the utility model, when a blockage occurs in the valve body 1, the impurities attached to the first filter screen 2 are scraped off and stored in the second chamber 13 through the cooperation between the hydraulic component 3 and the partition component 4, so that the servo valve has a self-cleaning function when blocked, reducing the frequency of manual maintenance and the labor intensity of the staff.

[0035] Preferably, the first elastic unit 32 can be a spring in the prior art.

[0036] It should be noted that the servo valve and the valve body 1 are common knowledge to those skilled in the art, so their structures and functions are not described in detail here.

[0037] It should be noted that the elastic force of the first elastic unit 32 is greater than the rated pressure of the oil inlet 11 when it is working, thereby preventing the pressure oil at the oil inlet 11 from accidentally driving the push plate 31 to move away from the oil inlet 11, thereby preventing the pushing member 33 from accidentally working.

[0038] It should be noted that the pressure transmission medium can be hydraulic oil, water, etc.

[0039] In one embodiment, a groove 15 is formed on the valve body 1 , and the groove 15 is arranged on a side of the oil inlet 11 close to the first filter 2 ;

[0040] The pushing member 33 includes a push rod 331 which is slidably arranged at the outlet of the first flow channel 14 in a direction close to or away from the partition part 4. The push rod 331 is dynamically sealed with the first flow channel 14. A scraper 332 is provided at one end of the push rod 331 close to the partition part 4. The scraping surface of the scraper 332 corresponds to the filtering surface of the first filter 2. When pressure oil is being input into the servo valve, the scraper 332 is inserted into the groove 15 to prevent the scraper 332 from interfering with the operation of the oil inlet 11. A second elastic unit 333 is provided between the end of the push rod 331 away from the scraper 332 and the first flow channel 14. The second elastic unit 333 applies a pulling force to the push rod 331 in a direction away from the partition part 4.

[0041] With this design, when the push plate 31 moves away from the oil inlet 11, the pressure transmission medium is squeezed by the push plate 31 and flows into the first flow channel 14. As the push plate 31 continues to move, the pressure transmission medium contacts the push rod 331 and applies a thrust to the push rod 331 in the direction close to the partition component 4. At this time, the second elastic unit 333 is stretched, and the scraper 332 moves with the push rod 331 and scrapes off impurities attached to the first filter 2. When the first filter 2 is unblocked, the oil pressure at the oil inlet 11 decreases, the first elastic unit 32 drives the push plate 31 to reset, and the second elastic unit 333 loses its constraint and drives the push rod 331 to move away from the partition component 4 until the scraper 332 is inserted into the groove 15.

[0042] Preferably, the second elastic unit 333 can be a tension spring in the prior art.

[0043] In one embodiment, the partition component 4 includes a side plate 41 arranged at the connection point between the second chamber 13 and the oil inlet 11, and an inclined surface is provided at the top end of the side plate 41. A partition plate 42 is also provided above the side plate 41. The partition plate 42 is arranged opposite to the scraper 332 and is rotatably connected to the valve body 1. Another inclined surface corresponding to the inclined surface of the side plate 41 is provided on the partition plate 42. A torsion spring (not shown in the figure) is provided at the rotational connection between the partition plate 42 and the valve body 1, and the torsion spring applies a downward rotating torsion force to the partition plate 42.

[0044] With this design, when the oil inlet 11 is open, the torsion spring applies a torsional force to rotate the partition plate 42 downward. At this time, the inclined surface of the partition plate 42 abuts against the inclined surface of the side plate 41 and applies downward pressure, thereby ensuring the sealing between the partition plate 42 and the side plate 41, preventing the pressure oil from accidentally flowing into the second chamber 13. When the oil inlet 11 is blocked, the scraper 332 moves toward the partition plate 42 until the scraper 332 drives the impurities to contact the partition plate 42 and applies a thrust to the partition plate 42 away from the oil inlet 11. At this time, the partition plate 42 rotates upward, and the oil inlet 11 is connected to the second chamber 13. The torsion spring is compressed, and impurities enter the second chamber 13. At this time, the oil inlet 11 is open again, and the scraper 332 moves away from the partition plate 42. The torsion spring loses its constraint and drives the partition plate 42 to rotate downward. The partition plate 42 is again in contact with the side plate 41, and the oil inlet 11 is disconnected from the second chamber 13.

[0045] It should be noted that sealing strips may be provided on the inclined surfaces of the partition plate 42 and the side plates 41 , thereby improving the sealing between the partition plate 42 and the side plates 41 .

[0046] In one embodiment, the valve body 1 further defines a second flow channel 16 , one end of which is in communication with the bottom end of the second chamber 13 , and the other end of which is in communication with the oil inlet 11 ;

[0047] A collecting component 5 is provided in the second chamber 13, and the collecting component 5 includes a second filter 51 arranged in the second chamber 13. The second filter 51 is arranged above the bottom end of the second chamber 13. The second filter 51 is used to prevent impurities from flowing back to the oil inlet 11 through the second flow channel 16. The pressure oil in the second chamber 13 can flow back to the oil inlet 11 through the second flow channel 16.

[0048] With this design, when pressurized oil is introduced into the oil inlet 11, part of the pressurized oil flows into the second chamber 13 through the oil inlet 11. When the partition plate 42 rotates upward, the top of the oil inlet 11 is connected with the second chamber 13. At this time, impurities at the oil inlet 11 enter the second chamber 13. Under the action of gravity, the impurities are accumulated on the second filter 51 and stored in the second chamber 13.

[0049] In one embodiment, a notch 17 communicating with the second chamber 13 is formed on one side of the valve body 1 , and screw holes 18 are formed on both sides of the notch 17 ;

[0050] The valve body 1 is also provided with a sealing assembly 53, which includes a sealing plate 531 arranged at the notch 17. The sealing plate 531 is provided with a group of through holes 532 corresponding one-to-one to the screw holes 18 on the valve body 1. The sealing plate 531 is also provided with a sealing block 533 corresponding to the shape of the notch 17 at one end close to the valve body 1. The sealing block 533 is used to seal the notch 17.

[0051] With this design, when the sealing block 533 fits with the slot 17, the through holes 532 on the sealing plate 531 correspond one-to-one with the screw holes 18 on the valve body 1, and then the bolts are used to pass through the corresponding through holes 532 in sequence and screw into the corresponding screw holes 18. At this time, the sealing block 533 blocks the slot 17 and seals the second chamber 13. When there are enough impurities stored in the second chamber 13, the bolts are removed. At this time, the sealing plate 531 loses its constraint. The second chamber 13 can be cleaned by removing the sealing plate 531, which is convenient to use.

[0052] It should be noted that the contact point between the sealing block 533 and the slot 17 can be chamfered and a sealing strip can be provided. When each bolt is screwed into the corresponding screw hole 18, each bolt applies a thrust to the slot 17 toward the valve body 1 through the sealing block 533, thereby further improving the sealing efficiency of the sealing block 533.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. In addition, "multiple", "multiple groups", and "several" refer to more than two.

Claims

1. A servo valve with a blockage-relieving structure, characterized in that: include: A valve body (1), wherein an oil inlet (11) for receiving pressure oil is provided in the valve body (1), a first chamber (12) is further provided in the valve body (1), a pressure transmission medium is stored in the first chamber (12) and is arranged on one side of the oil inlet (11), a second chamber (13) for storing impurities is provided on a side of the oil inlet (11) opposite to the first chamber (12), and a first flow channel (14) is further provided in the valve body (1), and an outlet of the first flow channel (14) is communicated with the oil inlet (11); A first filter (2) is arranged in the oil inlet (11), and the first filter (2) is used to prevent impurities in the pressure oil from entering the oil circuit of the servo valve; A hydraulic component (3) includes a push plate (31) slidably arranged in the first chamber (12), the push plate (31) being dynamically sealed to the first chamber (12), a first elastic unit (32) being provided between the push plate (31) and the first chamber (12), the first elastic unit (32) applying a thrust to the push plate (31) in a direction close to the oil inlet (11), an end of the first chamber (12) away from the oil inlet (11) being connected to an inlet of the first flow channel (14), the first flow channel (14) being used to convey a pressure transmission medium, and a pushing member (33) being provided at an outlet of the first flow channel (14), wherein when the push plate (31) moves in a direction away from the oil inlet (11), the pushing member (33) is used to scrape off impurities clogged at the bottom of the first filter (2); A partition component (4) is provided at the connection between the top of the second chamber (13) and the oil inlet (11), and is provided corresponding to the pushing member (33). When the pushing member (33) is cleaning impurities, the partition component (4) is used to control the connection and disconnection between the top of the oil inlet (11) and the second chamber (13).

2. The servo valve with a blockage-relieving structure according to claim 1, characterized in that: The valve body (1) is provided with a groove (15), and the groove (15) is arranged on a side of the oil inlet (11) close to the first filter (2); The pushing member (33) includes a push rod (331) which is slidably arranged at the outlet of the first flow channel (14) in a direction close to or away from the partition component (4). The push rod (331) is in dynamic sealing cooperation with the first flow channel (14). A scraper (332) is provided at one end of the push rod (331) close to the partition component (4). The scraping surface of the scraper (332) corresponds to the filtering surface of the first filter (2). When pressure oil is being input into the servo valve, the scraper (332) is inserted into the groove (15) to prevent the scraper (332) from interfering with the operation of the oil inlet (11). A second elastic unit (333) is provided between the end of the push rod (331) away from the scraper (332) and the first flow channel (14). The second elastic unit (333) applies a pulling force to the push rod (331) in a direction away from the partition component (4).

3. The servo valve with a blockage-relieving structure according to claim 2, characterized in that: The partition component (4) includes a side plate (41) arranged at the connection point between the second chamber (13) and the oil inlet (11), and the top end of the side plate (41) is provided with an inclined surface. A partition plate (42) is also provided above the side plate (41), the partition plate (42) is arranged opposite to the scraper (332) and the partition plate (42) is rotatably connected to the valve body (1), another inclined surface corresponding to the inclined surface of the side plate (41) is provided on the partition plate (42), and a torsion spring is provided at the rotation connection between the partition plate (42) and the valve body (1), and the torsion spring applies a torsional force to the partition plate (42) to rotate downward.

4. The servo valve with a blockage-relieving structure according to claim 3, characterized in that: A second flow channel (16) is further provided in the valve body (1), one end of the second flow channel (16) is communicated with the bottom end of the second chamber (13), and the other end of the second flow channel (16) is communicated with the oil inlet (11); A collecting component (5) is provided in the second chamber (13), and the collecting component (5) includes a second filter (51) arranged in the second chamber (13). The second filter (51) is arranged above the bottom end of the second chamber (13). The second filter (51) is used to prevent impurities from flowing back to the oil inlet (11) through the second flow channel (16). The pressure oil in the second chamber (13) can flow back to the oil inlet (11) through the second flow channel (16).

5. The servo valve with a blockage-relieving structure according to claim 4, characterized in that: A notch (17) communicating with the second chamber (13) is provided on one side of the valve body (1), and screw holes (18) are provided on both sides of the notch (17); The valve body (1) is further provided with a sealing assembly (53), the sealing assembly (53) comprising a sealing plate (531) arranged at the notch (17), the sealing plate (531) being provided with a group of through holes (532) corresponding one-to-one to the screw holes (18) on the valve body (1), and the sealing plate (531) being provided with a sealing block (533) corresponding to the shape of the notch (17) at one end thereof close to the valve body (1), the sealing block (533) being used to seal the notch (17).

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