Electromagnetic pilot operated valve

Abstract

The utility model relates to an electromagnetic pilot operated valve. The technical problem to be solved by the utility model is to provide an electromagnetic pilot operated valve. According to the technical scheme, the pilot valve comprises a pilot valve element assembly, the pilot valve element assembly comprises a threaded sleeve, a valve seat buffering assembly, a pressing sleeve, a guide sleeve, a main spring, a spring seat, a first magnetic ball, an ejector rod, a second magnetic ball and a pressing rod, and the pressing sleeve is arranged between the valve seat buffering assembly and the guide sleeve; the valve seat buffer assembly comprises a valve seat, a sealing contact piece and a buffer spring arranged in the sealing contact piece, and the sealing contact piece comprises a contact piece seat body and a contact piece installation boss. The electromagnetic pilot operated valve has the advantages that impact force and vibration generated by the electromagnetic pilot operated valve in the high-frequency action and high-pressure environment are absorbed through the buffer spring, direct contact between the magnetic ball and the valve seat can be avoided through the sealing contact piece, abrasion of the valve seat is reduced, the sealing contact piece is convenient to replace and low in replacement cost, and the service life of the whole product is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electromagnetic pilot valve. BACKGROUND

[0002] The electromagnetic pilot valve is a core component in the electro-hydraulic control system of the hydraulic support, receives the instruction of the controller, converts the electrical signal into the opening and closing action of the valve core, and then controls the opening and closing of the large-diameter two-position three-way valve core assembly on the main valve through small-flow hydraulic pressure, so as to control the actions such as the lifting, lowering, lifting of the bottom and pushing of the hydraulic support. The improved electromagnetic pilot valve in the patent with the patent number "202021324609.1" and the patent name "Improved electromagnetic pilot valve for mining" adopts the technical scheme: including a valve body, a pilot valve core assembly is arranged in the valve body, the pilot valve core assembly includes a screw sleeve, a valve seat, a pressure sleeve, a guide sleeve, a large spring arranged in the screw sleeve, a spring seat and a first magnetic ball, a top rod arranged in the valve seat, a second magnetic ball, a pressure rod, the pressure sleeve is arranged between the valve seat and the guide sleeve, a first pressure rod hole combination is arranged in the pressure sleeve, a second pressure rod hole is arranged in the guide sleeve, the second magnetic ball is arranged in the first pressure rod hole combination, the pressure rod passes through the first pressure rod hole combination and the second pressure rod hole in sequence, and is connected with a lever device through a screw micro-adjusting combination. The improved electromagnetic pilot valve structure is found to bear a large impact force and vibration due to frequent action and high-pressure environment in actual use, which causes accelerated wear or damage of the internal parts (such as the top rod, the valve seat and the magnetic ball), internal leakage, influence on the pressure stability of the hydraulic system, and further influence on the action accuracy and reliability of the hydraulic support, short service life of the internal parts, and high cost of replacing the valve seat. CONTENT OF THE UTILITY MODEL

[0003] To solve the above problems, the technical problem to be solved by the utility model is to provide an electromagnetic pilot valve.

[0004] The utility model discloses electromagnetic pilot valve adopts technical scheme: including pilot valve spool subassembly, its characterized in that pilot valve spool subassembly includes screw bush, valve seat buffer subassembly, presss from both sides, guide bush, set up in the main spring of screw bush, spring seat and first magnetic ball, top rod, second magnetic ball and pressure bar, the presss from both sides of valve seat buffer subassembly with guide bush is established, valve seat buffer subassembly includes valve seat, sets up in the sealing contact piece of valve seat both ends, sets up in the buffer spring of sealing contact piece, sealing contact piece includes contact piece seat body and sets up in the contact piece mounting boss of contact piece seat body end face, is equipped with spring placement groove for the buffer spring placement in contact piece seat body, spring placement groove bottom is equipped with contact piece through -hole, spring placement groove end face is equipped with the contact piece taper face sealed with first magnetic ball, second magnetic ball, top rod both ends pass through contact piece through -hole, buffer spring is met respectively with first magnetic ball, second magnetic ball opposite interface after in proper order,

[0005] Valve seat is equipped with valve seat butt joint groove for contact piece seat body installation, two valve seat butt joint grooves are connected and are used for the valve seat inner through -hole of top rod setting, the middle part of valve seat outer wall is equipped with valve seat circumscribed slot, and the valve seat is equipped with the valve seat liquid hole that communicates valve seat circumscribed slot with valve seat inner through -hole.

[0006] The bottom of the contact piece seat body is provided with a seat body limiting notch and a seat body sealing opening, the bottom of the valve seat butt joint groove is provided with a valve seat positioning convex edge corresponding to the seat body limiting notch and a valve seat inner sealing groove corresponding to the seat body sealing opening, and a sealing gasket is arranged between the valve seat inner sealing groove and the seat body sealing opening.

[0007] The depth of the seat body limiting notch is greater than the depth of the seat body sealing opening.

[0008] A valve seat inner blocking edge for preventing the buffer spring from moving is arranged on the inner wall of the spring placement groove.

[0009] A contact piece countersunk groove is arranged on the contact piece mounting boss at intervals around a circular arc, a contact piece connecting hole is arranged in the contact piece countersunk groove, valve seat threaded holes are arranged at the two ends of the valve seat, and the contact piece connecting hole and the valve seat threaded holes are connected through a screw.

[0010] A valve seat inner accommodation groove is arranged on the inner wall of the valve seat inner through -hole at the butt joint of the valve seat liquid hole.

[0011] The utility model discloses electromagnetic pilot valve's advantage lies in: increase sealing contact piece and buffer spring, through buffer spring has absorbed the impact force and vibration that electromagnetic pilot valve generates under high frequency action and high pressure environment, sealing contact piece can avoid the direct contact between magnetic ball and valve seat, reduces the wear and tear of valve seat, sealing contact piece is convenient for replacement and has low replacement cost, prolongs the service life of product whole. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model will be further explained in detail below in combination with the drawings and specific embodiments.

[0013] Figure 1 is the half sectional view of the electromagnetic pilot valve of the utility model;

[0014] Figure 2 is the half sectional view of the valve seat buffer assembly of the utility model;

[0015] Figure 3 is the half sectional view of the valve seat of the utility model;

[0016] Figure 4 is the half sectional view of the sealing contact piece of the utility model. Specific embodiments

[0017] As Figures 1-4 shown, the utility model relates to the electromagnetic pilot valve, including pilot valve spool assembly, the pilot valve spool assembly includes the screw sleeve 1, valve seat buffer assembly 2, the pressure sleeve 3, the guide sleeve 4, the main spring 5, spring seat 6 and the first magnetic ball 7 are established in the screw sleeve 1, the spring seat 6 and the first magnetic ball 7, the top rod 8, the second magnetic ball 9 and the pressure rod 10, the pressure sleeve 3 is established between the valve seat buffer assembly 2 with the guide sleeve 4, the valve seat buffer assembly 2 includes the valve seat 11, is established in the valve seat 11 both ends sealing contact piece 12, is established in the buffer spring 13 of sealing contact piece 12, the sealing contact piece 12 includes contact piece seat body 16 and is established in contact piece seat body 16 end surface contact piece installation boss 15, the spring insertion groove 17 for the buffer spring 13 is inserted into the contact piece seat body 16 and is equipped with, the bottom of spring insertion groove 17 is equipped with contact piece through hole 18, the end surface of spring insertion groove 17 is equipped with the contact piece taper surface 19 sealed with the first magnetic ball 7, the second magnetic ball 9, the top rod 8 both ends are sequentially through the contact piece through hole 18, the buffer spring 13 and respectively with the first magnetic ball 7, the second magnetic ball 9 are opposite to each other;The valve seat 11 is equipped with the valve seat butt joint groove 20 for the contact piece seat body 16 installation, the valve seat inner through hole 21 of the two valve seat butt joint groove 20 intercommunication and for the top rod 8 wear, the valve seat 11 outer wall middle part is equipped with the valve seat external groove 22, the valve seat 11 is equipped with the valve seat liquid passage 23 of the valve seat external groove 22 and the valve seat inner through hole 21 intercommunication, add sealing contact piece 12 and buffer spring 13, through the buffer spring 13 absorbed the impact force and vibration of electromagnetic pilot valve under high frequency action and high pressure environment, so that the first magnetic ball 7 and sealing contact piece 12 and the top rod 8 contact play the buffering effect, sealing contact piece 12 can avoid the direct contact between the magnetic ball and the valve seat 11, reduce the wear of valve seat, sealing contact piece 12 is convenient to replace and the replacement cost is low, prolongs the service life of product whole.

[0018] The bottom of the contact seat body 16 is provided with a seat limiting notch 25 and a seat sealing notch 26, the bottom of the valve seat butt joint groove 20 is provided with a valve seat positioning convex edge 27 corresponding to the seat limiting notch 25 and a valve seat inner sealing groove 28 corresponding to the seat sealing notch 26, and a sealing gasket 30 is arranged between the valve seat inner sealing groove 28 and the seat sealing notch 26, so as to ensure the sealing property of the butt joint after the sealing contact 12 is installed and reduce leakage.

[0019] The depth of the seat limiting notch 25 is greater than the depth of the seat sealing notch 26, so that the leakage of liquid can be effectively slowed down and the sealing property of the butt joint is further improved.

[0020] The valve seat inner blocking edge 31 is arranged on the inner wall of the spring embedding groove 17 and prevents the buffer spring 13 from moving, so as to limit the buffer spring 13 and make the action of the buffer spring 13 more reliable.

[0021] The contact piece mounting boss 15 is provided with contact piece countersunk grooves 33 at intervals around the arc, the contact piece countersunk grooves 33 are provided with contact piece connecting holes 34, the valve seat 11 is provided with valve seat threaded holes 35 at two ends, the contact piece connecting holes 34 and the valve seat threaded holes 35 are connected through screws, the surface is smoother, the connection is prevented from loosening, and the overall stability of the electromagnetic pilot valve is improved.

[0022] The valve seat inner accommodating groove 37 is arranged on the inner wall of the valve seat inner through hole 21 at the butt joint of the valve seat liquid passing hole 23, so as to optimize the fluid flow path and make the liquid flow more smooth and stable.

[0023] The above only describes the preferred embodiments of the utility model and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. An electromagnetic pilot valve, comprising a pilot valve core assembly, characterized in that: The pilot valve core assembly includes a threaded sleeve (1), a valve seat buffer assembly (2), a pressure sleeve (3), a guide sleeve (4), a main spring (5), a spring seat (6), a first magnetic ball (7), a push rod (8), a second magnetic ball (9), and a pressure rod (10) disposed within the threaded sleeve (1). The pressure sleeve (3) is disposed between the valve seat buffer assembly (2) and the guide sleeve (4). The valve seat buffer assembly (2) includes a valve seat (11), sealing contacts (12) at both ends of the valve seat (11), and a buffer spring (13) in the sealing contacts (12). The sealing contacts (12) include a contact seat (16) and a contact mounting boss (15) on the end face of the contact seat (16). The contact seat (16) has a spring insertion groove (17) for inserting the buffer spring (13). The bottom of the spring insertion groove (17) has a contact through hole (18). The end face of the spring insertion groove (17) has a contact cone surface (19) that seals with the first magnetic ball (7) and the second magnetic ball (9). The two ends of the push rod (8) pass through the contact through hole (18) and the buffer spring (13) in sequence and then connect with the first magnetic ball (7) and the second magnetic ball (9) respectively. The valve seat (11) is provided with a valve seat mating groove (20) for mounting the contact seat body (16), a valve seat inner through hole (21) for connecting the two valve seat mating grooves (20) and for the push rod (8) to pass through, a valve seat outer groove (22) is provided in the middle of the outer wall of the valve seat (11), and a valve seat liquid flow hole (23) is provided in the valve seat outer groove (22) and the valve seat inner through hole (21).

2. The electromagnetic pilot valve according to claim 1, characterized in that: The bottom of the contact seat (16) is provided with a seat limiting recess (25) and a seat sealing port (26). The bottom of the valve seat mating groove (20) is provided with a valve seat positioning protrusion (27) corresponding to the seat limiting recess (25) and a valve seat inner sealing groove (28) corresponding to the seat sealing port (26). A sealing gasket (30) is provided between the valve seat inner sealing groove (28) and the seat sealing port (26).

3. The electromagnetic pilot valve according to claim 2, characterized in that: The depth of the seat limiting recess (25) is greater than the depth of the seat sealing opening (26).

4. The electromagnetic pilot valve according to claim 1, characterized in that: The inner wall of the spring insertion groove (17) is provided with an inner stop (31) of the valve seat to prevent the buffer spring (13) from moving.

5. The electromagnetic pilot valve according to claim 1, characterized in that: The contact mounting boss (15) is provided with a countersunk groove (33) at intervals around the arc. The countersunk groove (33) is provided with a contact connection hole (34). The valve seat (11) is provided with valve seat threaded holes (35) at both ends. The contact connection hole (34) and the valve seat threaded hole (35) are connected by screws.

6. The electromagnetic pilot valve according to claim 1, characterized in that: The inner wall of the valve seat through hole (21) is provided with a valve seat relief groove (37) at the junction of the valve seat liquid flow hole (23).

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