Proportional electromagnetic valve

Abstract

The proportional electromagnetic valve comprises a valve sleeve, a valve element, a fixing base and an output outer sleeve, the valve element is provided with a pressure equalizing groove, the pressure equalizing groove is attached to the inner wall of the valve sleeve, the valve element is kept in the middle when pressure oil is input, clamping stagnation and abrasion of the valve element are effectively prevented, and meanwhile the valve element moves in the valve sleeve more stably. In addition, the structures of the valve sleeve and the valve element are reasonably improved and arranged, and an oil inlet channel is optimized, so that when hydraulic oil passes through, the valve element moves and operates in the valve sleeve more stably, and the fault occurrence rate is further reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering equipment, and in particular relates to a proportional solenoid valve. Background Art

[0002] Proportional solenoid valves are commonly used in pumps and valves that require proportional solenoid valve control in a variety of engineering machinery and equipment, such as Carter's new electric-controlled excavators, Sany excavators, and Xugong excavators. The proportional solenoid valve core needs to be used with a matching electromagnetic proportional coil (external component). During the use of existing proportional solenoid valves, the above-mentioned various engineering machinery and equipment are easily contaminated by hydraulic system due to damage to hydraulic parts, breaking hammers, etc., causing the solenoid proportional valve core to frequently get stuck, which in turn causes the equipment to fail to work properly and affects the progress of the project.

[0003] Based on this, a proportional solenoid valve is provided, which reduces valve core sticking by optimizing and improving the valve core structure, and makes the valve core run more stably in the valve sleeve. Summary of the invention

[0004] The purpose of the present invention is to provide a proportional solenoid valve to solve the problem of frequent jamming and unstable operation of the proportional solenoid valve in the prior art due to contamination of the hydraulic system.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A proportional solenoid valve, characterized by comprising:

[0007] The valve sleeve is provided with a circular hollow hole, one end of which is closed and the other end is open; the valve sleeve is provided with an oil return hole, a first oil inlet hole and a second oil inlet hole; each of the first oil inlet holes is axially corresponding to an oil return hole, and each of the second oil inlet holes is axially corresponding to an oil return hole;

[0008] A fixed seat is provided with a through hole matched with the armature; the fixed seat is connected to the open end of the valve sleeve to form a first cavity;

[0009] The valve core is cylindrical; a stopper is provided at one end of the valve core, and a pressure equalizing groove is provided on the other end; the valve core is placed in the circular hollow hole of the valve sleeve, so that the pressure equalizing groove fits with the side wall of the hollow hole; a return spring is provided on the outer sleeve of the valve core, and the return spring is located in the first cavity, so that one end of the return spring abuts against the valve core stopper, and the other end abuts against the valve sleeve;

[0010] The output outer sleeve is provided with a through hole matching the valve sleeve, and the side wall of the output outer sleeve is provided with a third oil inlet hole; the output outer sleeve is arranged outside the closed end of the valve sleeve, and the third oil inlet hole and the first oil inlet hole of the valve sleeve are arranged correspondingly, so that a first oil inlet channel is formed between the output outer sleeve and the first oil inlet hole of the valve sleeve, and a second oil inlet channel is formed between the output outer sleeve and the second oil inlet hole of the valve sleeve.

[0011] In the present invention, the pressure equalizing groove is formed by a group of annular grooves arranged with the same spacing. The annular groove has the function of accommodating some pollutants, further reducing the possibility of stagnation and increasing the service life.

[0012] In the present invention, the valve sleeve is provided with a groove, and the second oil inlet hole is arranged in the groove, so that a second oil inlet channel is formed between the output outer sleeve and the second oil inlet hole of the valve sleeve groove.

[0013] In the present invention, the valve sleeve comprises a first connecting portion, a main body and a second connecting portion which are connected in sequence; the oil return hole is arranged in the main body, and the first oil inlet hole and the second oil inlet hole are arranged in the second connecting portion.

[0014] Furthermore, the groove is provided on the second connecting portion.

[0015] In some embodiments of the present invention, there are eight oil return holes, four first oil inlet holes, and four second oil inlet holes; the first oil inlet holes and the second oil inlet holes are arranged at intervals.

[0016] The present invention can be improved in that a balancing protrusion is provided in the middle of the valve core, and the balancing protrusion is in contact with the inner wall of the circular hollow hole of the valve sleeve. By providing a balancing groove, the valve core can be kept centered during movement to prevent jamming, and the movement of the valve core in the valve sleeve can be made more stable.

[0017] Furthermore, the cross section of the balancing protrusion is an equilateral triangle, and three corner guide arcs are provided, and the arc parts are in contact and connected with the inner wall of the circular hollow hole of the valve sleeve.

[0018] Furthermore, the valve core is further provided with a first protrusion and a second protrusion, the first protrusion is provided with a first oil passing groove, the second protrusion is provided with a second oil passing groove, and the outer diameter of the first protrusion is larger than the outer diameter of the second protrusion. The inconsistency of the outer diameters of the first protrusion and the second protrusion can generate hydraulic oil thrust when hydraulic oil passes through, and in the maximum stroke state, the hydraulic oil thrust enables the valve core to obtain a reaction force to offset the thrust of the external armature assembly, so as to maintain the process in which the valve core can move forward and backward.

[0019] The present invention can be further improved, wherein a slot is provided in the valve core, a throttle hole is provided between the balancing protrusion and the first protrusion, and the throttle hole is connected to the slot. This arrangement can reduce the impact of the valve core when switching between oil grooves, and the movement of the valve core in the valve sleeve is more stable.

[0020] Furthermore, a third oil passage groove is respectively provided at both ends of the valve core. Through such an arrangement, the hydraulic oil can flow more smoothly and the valve core can move more stably.

[0021] The present invention has the following beneficial effects:

[0022] (1) The valve core of the proportional solenoid valve of the present invention is provided with a pressure equalizing groove, which fits the inner wall of the valve sleeve. When the pressure oil is input, the valve core is kept centered, which effectively prevents the valve core from getting stuck and wearing. At the same time, the valve core moves more smoothly inside the valve sleeve.

[0023] (2) The proportional solenoid valve of the present invention rationally improves the structure of the valve sleeve and valve core and optimizes the oil inlet channel so that when the hydraulic oil passes through, the movement of the valve core in the valve sleeve is more stable, further reducing the occurrence rate of failures.

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the proportional solenoid valve of the present invention;

[0026] Figure 2 for Figure 1 Exploded diagram of

[0027] Figure 3 It is a front view of the proportional solenoid valve of the present invention;

[0028] Figure 4 It is a rear view of the proportional solenoid valve of the present invention;

[0029] Figure 5 It is a right side view of the proportional solenoid valve of the present invention;

[0030] Figure 6 A top view of the proportional solenoid valve of the present invention;

[0031] Figure 7 It is a schematic diagram of the overall structure of the valve sleeve of the proportional solenoid valve of the present invention;

[0032] Figure 8 It is a front view of the valve sleeve of the proportional solenoid valve of the present invention;

[0033] Fig. 9 It is a rear view of the valve sleeve of the proportional solenoid valve of the present invention;

[0034] Fig.10 It is a right side view of the valve sleeve of the proportional solenoid valve of the present invention;

[0035] Fig.11 A top view of a valve sleeve of a proportional solenoid valve of the present invention;

[0036] Fig.12 for Figure 8 BB view;

[0037] Fig.13 for Figure 8 bb view;

[0038] Fig.14 It is a schematic diagram of the overall structure of the proportional solenoid valve core of the present invention;

[0039] Fig.15 It is a front view of the valve core of the proportional solenoid valve of the present invention;

[0040] Fig.16 It is a rear view of the valve core of the proportional solenoid valve of the present invention;

[0041] Fig.17 It is a right side view of the valve core of the proportional solenoid valve of the present invention;

[0042] Fig.18 A top view of a valve sleeve of a proportional solenoid valve of the present invention;

[0043] Fig.19 for Fig.15 CC view;

[0044] Fig. 20 for Fig.19 DD view;

[0045] Fig.21 This is a schematic diagram of the overall structure of the output jacket of the proportional solenoid valve of the present invention;

[0046] Fig. 22 It is a front view of the output outer sleeve of the proportional solenoid valve of the present invention;

[0047] Fig.23 It is a right side view of the output jacket of the proportional solenoid valve of the present invention;

[0048] Fig.24 A top view of an output housing of a proportional solenoid valve of the present invention;

[0049] Fig.25 for Fig. 22 EE view;

[0050] Fig.26 It is a schematic diagram of the overall structure of the proportional solenoid valve fixing seat of the present invention;

[0051] Fig. 27 It is a front view of the fixing seat of the proportional solenoid valve of the present invention;

[0052] Fig.28 It is a cross-sectional view of a fixing seat of a proportional solenoid valve of the present invention;

[0053] Fig.29It is a schematic diagram of the assembly of the proportional solenoid valve and the armature of the present invention;

[0054] Fig.30 It is a connection diagram of the proportional solenoid valve and the armature of the present invention in a state of being fitted;

[0055] Fig.31 yes Fig.30 Enlarged view of part I in the middle;

[0056] Fig.32 It is a schematic diagram of the connection between the proportional solenoid valve and the armature in the half-stroke state of the present invention;

[0057] Fig.33 yes Fig.32 Enlarged view of middle part II;

[0058] Fig.34 It is a schematic diagram of the connection between the proportional solenoid valve and the armature in the half-stroke state of the present invention;

[0059] Fig.35 yes Fig.34 Enlarged view of middle part III;

[0060] The markings in the accompanying drawings are as follows: 1. valve sleeve; 2. valve core; 3. fixed seat; 4. output sleeve; 5. reset spring; 5. first cavity; 6. second cavity; 7. sealing ring; 8. armature; 101. first connecting part; 102. main body; 103. second connecting part; 104. hollow hole; 105. groove; 106. oil return hole; 107. first oil inlet hole; 108. second oil inlet hole; 201. limiter; 202. slot hole; 203. pressure equalizing groove; 204. balancing protrusion; 205. first protrusion; 206. second protrusion; 207. first oil groove; 208. second oil groove; 209. throttling hole; 210. third oil groove; 301. through hole; 401. through hole; 402. third oil inlet hole. DETAILED DESCRIPTION

[0061] The technical solution of the present invention is further described below in conjunction with specific embodiments, so that those skilled in the art can better understand the technical solution of the present invention and implement it.

[0062] like Figure 1-28 The proportional solenoid valve shown comprises a valve sleeve 1, a valve core 2, a fixed seat 3 and an output outer sleeve 4.

[0063] The valve sleeve 1 is provided with a circular hollow hole 104, one end of which is closed and the other end is open. The valve sleeve 1 includes a first connecting portion 101, a main body 102 and a second connecting portion 103 which are connected in sequence; the main body 102 is provided with eight oil return holes 106 which are evenly distributed on the main body 102. The second connecting portion 103 is provided with four first oil inlet holes 107, and each first oil inlet hole 107 is axially corresponding to an oil return hole 106. The second connecting portion 103 is provided with four grooves 105, and the four grooves 105 are evenly distributed on the second connecting portion 103. Each groove 105 is provided with a second oil inlet hole 108, and each second oil inlet hole 108 is axially corresponding to an oil return hole 106. In this embodiment, the first oil inlet hole 107 and the second oil inlet hole 108 are arranged at intervals.

[0064] The fixing seat 3 is provided with a through hole 301 matched with the armature 8. The fixing seat 3 is connected to the first connecting portion 101 of the valve sleeve 1 to form a first cavity 5.

[0065] The valve core 2 is cylindrical as a whole, and a circular slot 202 is provided inside the valve core 2. A stopper 201 is provided at one end of the valve core 2, and a pressure equalizing groove 203 is provided outside the other end; the pressure equalizing groove 203 is formed by a group of annular grooves arranged with the same spacing. A balancing protrusion 204 is provided in the middle of the valve core 2, and the cross section of the balancing protrusion 204 is an equilateral triangle, and three corner guide arcs are provided, and the arc part is in contact and connected with the inner wall of the circular hollow hole 104 of the valve sleeve 1. A first protrusion 205 and a second protrusion 206 are also provided between the balancing protrusion 204 and the pressure equalizing groove 203, and the cross sections of the first protrusion 205 and the second protrusion 206 are both circular. The outer diameter of the first protrusion 205 is larger than the outer diameter of the second protrusion 206. The first protrusion 205 is provided with two first oil-passing grooves 207, which are symmetrically arranged on both sides of the first protrusion 205, and the second protrusion 206 is provided with two second oil-passing grooves 208, which are symmetrically arranged on both sides of the second protrusion 206. A throttle hole 209 is provided between the balancing protrusion 204 and the first protrusion 205, and the throttle hole 209 is connected to the circular slot 202. In this embodiment, a third oil groove 210 is provided at each end of the valve core 2. Through such an arrangement, the hydraulic oil can flow more smoothly and the movement of the valve core 2 can be more stable. The valve core 2 is placed in the circular hollow hole 104 of the valve sleeve 1, and forms a second cavity 6 with the valve sleeve 1; the end of the valve core 2 limiter 201 is placed in the first cavity 5, and the end of the pressure equalizing groove 203 is placed in the second cavity 6. A reset spring 5 is provided on the outer sleeve of the valve core 2, and the reset spring 5 is located in the first cavity 5, so that one end of the reset spring 5 presses against the valve core 2 limiter 201, and the other end presses against the valve sleeve 1.

[0066] The output outer sleeve 4 is provided with a through hole 401 matching the valve sleeve 1, and the side wall of the output outer sleeve 4 is provided with four evenly distributed third oil inlet holes 402; the output outer sleeve 4 is sleeved outside the second connecting portion 103 of the valve sleeve 1, and each third oil inlet hole 402 is correspondingly arranged with a first oil inlet hole 107 of the valve sleeve 1, so that a first oil inlet channel is formed between the output outer sleeve 4 and the first oil inlet hole 107 of the valve sleeve 1, and a second oil inlet channel is formed between the output outer sleeve 4 and the second oil inlet hole 108 of the valve sleeve 1.

[0067] In the present invention, a sealing ring 7 is provided at the connection between the valve sleeve 1 and the fixing seat 3 , and a sealing ring 7 is provided at the connection between the valve sleeve 1 and the output outer sleeve 4 .

[0068] The working process of the proportional solenoid valve of the present invention is as follows: Fig.29 The assembly diagram of the armature and the proportional battery valve of the present invention is shown in FIG. Fig.30 , Fig.31 In the fitted state shown, when the outer electromagnetic coil is not working or the current is small, the internal valve core 2 will be pushed to the minimum stroke of the valve core 2 by the elastic force of the return spring 5. At this time, the opening between the valve core 2 and the valve sleeve 1 assembly will communicate with the second oil hole 108 and the oil return hole 106. Fig.32 , Fig.33 In the semi-formed state shown, when the outer electromagnetic coil is working, the fixed seat 3 will generate magnetism, attracting the armature 8 assembly of the outer part inward to offset the elasticity of the return spring 5. When the valve core 2 reaches the half-stroke state, the oil groove of the valve core 2 will be sealed, and the hydraulic oil will not flow. Fig.34 , Fig.35 In the maximum forming state shown, when the current passing through the outer electromagnetic coil is relatively large, the magnetism generated by the fixed seat 3 attracts the armature 8 assembly to the maximum stroke, and at this time, the valve core 2 passes through the oil groove to connect the first oil hole 107 and the second oil hole 108. Due to the different sizes of the two oil grooves (the first oil groove 207 and the second oil groove 208) at the front and rear of the valve core 2, the hydraulic oil pressure difference is generated, so that the valve core 2 obtains the reaction force to offset the thrust of the armature 8 assembly, and the valve core 2 can move forward and backward.

[0069] The above embodiments of the present invention are not intended to limit the protection scope of the present invention, and the implementation modes of the present invention are not limited thereto. All other modifications, replacements or changes made to the above structures of the present invention by ordinary technicians in the field according to the common technical knowledge and customary means in the field based on the above contents of the present invention, without departing from the above basic technical ideas of the present invention, should fall within the protection scope of the present invention.

Claims

1. A proportional solenoid valve, characterized in that: include: A valve sleeve (1) is provided with a circular hollow hole (104) therein, one end of which is closed and the other end of which is open; the valve sleeve (1) is provided with an oil return hole (106), a first oil inlet hole (107) and a second oil inlet hole (108); each of the first oil inlet holes (107) is axially arranged corresponding to an oil return hole (106), and each of the second oil inlet holes (108) is axially arranged corresponding to an oil return hole (106); The fixed seat (3) is provided with a through hole (301) that cooperates with the armature (8); the fixed seat (3) is connected to the open end of the valve sleeve (1) to form a first cavity (5); The valve core (2) is cylindrical; a stopper (201) is provided at one end of the valve core (2), and a pressure equalizing groove (203) is provided on the other end; the valve core (2) is placed in a circular hollow hole (104) of the valve sleeve (1), so that the pressure equalizing groove (203) fits with the side wall of the hollow hole (104); a return spring (5) is provided on the outer sleeve of the valve core (2), and the return spring (5) is located in the first cavity (5), so that one end of the return spring (5) abuts against the stopper (201) of the valve core (2), and the other end abuts against the valve sleeve (1); An output outer sleeve (4) is provided with a through hole (401) matching the valve sleeve (1), and a third oil inlet hole (402) is opened on a side wall of the output outer sleeve (4); the output outer sleeve (4) is sleeved outside the closed end of the valve sleeve (1), and the third oil inlet hole (402) and the first oil inlet hole (107) of the valve sleeve (1) are arranged correspondingly, so that a first oil inlet channel is formed between the output outer sleeve (4) and the first oil inlet hole (107) of the valve sleeve (1), and a second oil inlet channel is formed between the output outer sleeve (4) and the second oil inlet hole (108) of the valve sleeve (1).

2. The proportional solenoid valve according to claim 1, characterized in that: The pressure equalizing groove (203) is formed by a group of annular grooves arranged at the same intervals.

3. The proportional solenoid valve according to claim 2, characterized in that: The valve sleeve (1) is provided with a groove (105), and the second oil inlet hole (108) is arranged in the groove (105), so that a second oil inlet channel is formed between the output outer sleeve (4) and the second oil inlet hole (108) in the groove (105) of the valve sleeve (1).

4. The proportional solenoid valve according to claim 3, characterized in that: The valve sleeve (1) comprises a first connecting portion (101), a main body (102) and a second connecting portion (103) which are connected in sequence; the oil return hole (106) is arranged in the main body (102), the first oil inlet hole (107) and the second oil inlet hole (108) are arranged in the second connecting portion (103); and the groove (105) is arranged in the second connecting portion (103).

5. The proportional solenoid valve according to any one of claims 1 to 4, characterized in that: There are eight oil return holes (106), four first oil inlet holes (107), and four second oil inlet holes (108); the first oil inlet holes (107) and the second oil inlet holes (108) are arranged at intervals.

6. The proportional solenoid valve according to any one of claims 1 to 4, characterized in that: A balancing protrusion (204) is provided in the middle of the valve core (2), and the cross section of the balancing protrusion (204) is an equilateral triangle, with three corner guide arcs, and the arc parts are in contact with and connected to the inner wall of the circular hollow hole (104) of the valve sleeve (1).

7. The proportional solenoid valve according to claim 6, characterized in that: The valve core (2) is further provided with a first protrusion (205) and a second protrusion (206); the first protrusion (205) is provided with a first oil passage groove (207); the second protrusion (206) is provided with a second oil passage groove (208); and the outer diameter of the first protrusion (205) is greater than the outer diameter of the second protrusion (206).

8. The proportional solenoid valve according to claim 7, characterized in that: A slot hole (202) is provided in the valve core (2), a throttle hole (209) is provided between the balancing protrusion (204) and the first protrusion (205), and the throttle hole (209) is communicated with the slot hole (202).

9. The proportional solenoid valve according to claim 8, characterized in that: A third oil passage groove (210) is respectively provided at both ends of the valve core (2).

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