Proportional electromagnetic valve

Abstract

The proportional electromagnetic valve comprises a valve sleeve, a valve element, a fixing seat 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 utility model belongs to engineering equipment technical field, concretely relates to a proportional solenoid valve. BACKGROUND

[0002] Proportional solenoid valve is often used on the pump and valve of various engineering mechanical equipment such as new model electric control excavator of CAT, excavator of Sany, excavator of Xugong, etc. and needs proportional solenoid valve control, and the proportional solenoid valve core needs to be matched with electromagnetic proportional coil (external part) for use. The proportional solenoid valve of the prior art is prone to frequent jamming of the solenoid valve core due to hydraulic component damage, breaking of the hammer and other reasons, which pollutes the hydraulic system, and further causes the equipment to work abnormally and affects the engineering progress.

[0003] Therefore, the proportional solenoid valve is provided by optimizing and improving the structure of the proportional solenoid valve core, which reduces the jamming of the valve core and makes the valve core run more stably in the valve sleeve. SUMMARY

[0004] The utility model discloses a proportional solenoid valve, and solves the problem of frequent jamming and unstable operation of the proportional solenoid valve due to hydraulic system pollution in the prior art.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A proportional solenoid valve, characterized in that it comprises:

[0007] A valve sleeve is internally 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 first oil inlet hole is arranged in axial correspondence with an oil return hole, and each second oil inlet hole is arranged in axial correspondence with an oil return hole;

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

[0009] A valve core is in the shape of a cylinder; one end of the valve core is provided with a limiting piece, and the other end is externally provided with an equalizing groove; the valve core is arranged in the circular hollow hole of the valve sleeve, so that the equalizing groove is attached to the side wall of the hollow hole; the valve core is externally provided with a return spring, and the return spring is located in the first cavity, so that one end of the return spring abuts against the limiting piece of the valve core, and the other end abuts against the valve sleeve;

[0010] The output sleeve is internally provided with a through hole matched with the valve sleeve, and a third oil inlet hole is formed on one side of the output sleeve; the output sleeve is sleeved on the closed end of the valve sleeve, and the third oil inlet hole and the first oil inlet hole of the valve sleeve are correspondingly arranged, so that a first oil inlet channel is formed between the output sleeve and the first oil inlet hole of the valve sleeve, and a second oil inlet channel is formed between the output sleeve and the second oil inlet hole of the valve sleeve.

[0011] In the utility model, the equalizing groove is arranged by a group of annular grooves with same interval. The annular groove has the effect of containing part of pollutants, further reduces the possibility of jamming and improves the service life.

[0012] In the utility model, 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 second oil inlet hole of the groove of the valve sleeve and the output sleeve.

[0013] In the utility model, the valve sleeve comprises a first connecting part, a main part and a second connecting part which are sequentially connected; the oil return hole is arranged in the main part, and the first oil inlet hole and the second oil inlet hole are arranged in the second connecting part.

[0014] Further, the groove is arranged in the second connecting part.

[0015] In some embodiments of the utility model, the oil return hole has eight, the first oil inlet hole has four, and the second oil inlet hole has four; the first oil inlet hole and the second oil inlet hole are arranged at intervals.

[0016] The utility model can be improved as follows: the valve core middle part is equipped with balance protrusion, and the balance protrusion is in contact with the inner wall of the valve sleeve circular hollow hole. By arranging the balance groove, the valve core can be kept in the middle during movement, the jamming is prevented, and the movement of the valve core in the valve sleeve is more stable.

[0017] Further, the balance protrusion has an equilateral triangle cross section, three corners are provided with circular arcs, and the circular arc parts are in contact with the inner wall of the valve sleeve circular hollow hole.

[0018] Further, 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 that of the second protrusion. The inconsistent outer diameters of the first protrusion and the second protrusion can make the hydraulic oil generate hydraulic oil thrust when passing, and in the maximum stroke state, the hydraulic oil thrust makes the valve core obtain the counterforce of the external armature assembly thrust, so that the valve core can move forward and backward.

[0019] The utility model discloses can further improve, the valve core is equipped with the slot hole, the balance protruding and the first protruding are equipped with the throttle hole, and the throttle hole is linked together with the slot hole. By such setting can reduce the impact when the valve core over oil groove switching state, and the movement of valve core in the valve sleeve is more stable.

[0020] Further, the valve core two ends are equipped with a third over oil groove respectively. By such setting, let the hydraulic oil flow more smoothly, and the movement of valve core is more stable.

[0021] The utility model has the following beneficial effects:

[0022] (1) the utility model discloses that proportional electromagnetic valve valve core is equipped with the pressure equalizing groove, and the pressure equalizing groove is attached to the valve sleeve, and when input pressure oil, keep the valve core in the middle, effectively prevent the valve core from sticking and wearing, and the valve core moves more stably in the valve sleeve.

[0023] (2) the utility model discloses that proportional electromagnetic valve carries out reasonable improvement layout to the structure of valve sleeve and valve core, and the oil inlet passage is optimized, so that when the hydraulic oil passes, the movement of valve core in the valve sleeve is more stable, and the failure rate is further reduced.

[0024] The utility model will be further explained in detail in connection with the drawings and specific embodiment. DRAWINGS

[0025] Figure 1 It is the overall structure schematic diagram of the utility model discloses proportional electromagnetic valve;

[0026] Figure 2 It is Figure 1 the explosion map;

[0027] Figure 3 It is the front view of the utility model discloses proportional electromagnetic valve;

[0028] Figure 4 It is the back view of the utility model discloses proportional electromagnetic valve;

[0029] Figure 5 It is the right view of the utility model discloses proportional electromagnetic valve;

[0030] Figure 6 It is the plan view of the utility model discloses proportional electromagnetic valve;

[0031] Figure 7 It is the overall structure schematic diagram of the utility model discloses proportional electromagnetic valve sleeve;

[0032] Figure 8 It is the front view of the utility model discloses proportional electromagnetic valve sleeve;

[0033] Figure 9 It is the back view of the utility model discloses proportional electromagnetic valve sleeve;

[0034] Figure 10 This is a right view of the valve sleeve of the proportional solenoid valve of this utility model.

[0035] Figure 11 This is a top view of the proportional solenoid valve sleeve of this utility model.

[0036] Figure 12 for Figure 8 BB view;

[0037] Figure 13 for Figure 8 bb view;

[0038] Figure 14 This is a schematic diagram of the overall structure of the proportional solenoid valve core of this utility model.

[0039] Figure 15 This is a front view of the proportional solenoid valve core of this utility model.

[0040] Figure 16 This is a rear view of the proportional solenoid valve core of this utility model.

[0041] Figure 17 This is a right view of the valve core of the proportional solenoid valve of this utility model.

[0042] Figure 18 This is a top view of the proportional solenoid valve sleeve of this utility model.

[0043] Figure 19 for Figure 15 CC view;

[0044] Figure 20 for Figure 19 DD view;

[0045] Figure 21 This is a schematic diagram of the overall structure of the output sleeve of the proportional solenoid valve of this utility model;

[0046] Figure 22 This is a front view of the output sleeve of the proportional solenoid valve of this utility model;

[0047] Figure 23 This is a right view of the output sleeve of the proportional solenoid valve of this utility model;

[0048] Figure 24 This is a top view of the output sleeve of the proportional solenoid valve of this utility model;

[0049] Figure 25 for Figure 22 EE view;

[0050] Figure 26 This is a schematic diagram of the overall structure of the proportional solenoid valve mounting base of this utility model;

[0051] Figure 27 It is the front view of the proportional electromagnetic valve fixing seat of the utility model;

[0052] Figure 28 It is the sectional view of the proportional electromagnetic valve fixing seat of the utility model;

[0053] Figure 29 It is the assembly schematic view of the proportional electromagnetic valve and armature of the utility model;

[0054] Figure 30 It is the connection schematic view of the proportional electromagnetic valve and armature under the adhering state of the utility model;

[0055] Figure 31 It is Figure 30 The enlarged view of the middle I part;

[0056] Figure 32 It is the connection schematic view of the proportional electromagnetic valve and armature under the half stroke state of the utility model;

[0057] Figure 33 It is Figure 32 The enlarged view of the middle II part;

[0058] Figure 34 It is the connection schematic view of the proportional electromagnetic valve and armature under the half stroke state of the utility model;

[0059] Figure 35 It is Figure 34 The enlarged view of the middle III part;

[0060] The marks in the drawing are as follows: 1, valve sleeve; 2, valve core; 3, fixing 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 part; 103, second connecting part; 104, hollow hole; 105, groove; 106, oil return hole; 107, first oil inlet hole; 108, second oil inlet hole; 201, limiting piece; 202, slot hole; 203, pressure equalizing groove; 204, balance protrusion; 205, first protrusion; 206, second protrusion; 207, first oil passing groove; 208, second oil passing groove; 209, throttling hole; 210, third oil passing groove; 301, through hole; 401, through hole; 402, third oil inlet hole. DETAILED DESCRIPTION

[0061] The technical scheme of the utility model is further explained below in combination with specific embodiments, so that the technical scheme of the utility model is better understood by the ordinary skilled in the art and implemented.

[0062] As Figures 1-28 shown proportional electromagnetic valve, including valve sleeve 1, valve core 2, fixing seat 3 and output sleeve 4.

[0063] The valve sleeve 1 is internally provided with a circular hollow hole 104, one end of which is closed and the other end is open. The valve sleeve 1 comprises a first connecting part 101, a main body part 102 and a second connecting part 103 connected in sequence; the main body part 102 is provided with eight oil return holes 106 uniformly distributed on the main body part 102. The second connecting part 103 is provided with four first oil inlet holes 107, each of which is arranged in axial correspondence with one oil return hole 106. The second connecting part 103 is provided with four grooves 105, which are uniformly distributed on the second connecting part 103. Each groove 105 is internally provided with a second oil inlet hole 108, each of which is arranged in axial correspondence with one 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 fixed seat 3 is provided with a through hole 301 matched with the armature 8. The fixed seat 3 is connected with the first connecting part 101 of the valve sleeve 1 to form the first cavity 5.

[0065] The valve core 2 is in the shape of a cylinder as a whole, and is internally provided with a circular groove 202. The valve core 2 is provided with a limiting part 201 at one end and an equalizing groove 203 externally provided at the other end; the equalizing groove 203 is arranged by a group of annular grooves with the same spacing. The valve core 2 is provided with a balance protrusion 204 in the middle, the cross section of which is in the shape of an equilateral triangle, three corners of which are provided with circular arcs, and the circular arc parts are in contact with the inner wall of the circular hollow hole 104 of the valve sleeve 1. The balance protrusion 204 and the equalizing groove 203 are further provided with a first protrusion 205 and a second protrusion 206, the cross sections of which are both circular. The outer diameter of the first protrusion 205 is larger than that of the second protrusion 206. The first protrusion 205 is provided with two first oil passing grooves 207 symmetrically arranged on both sides of the first protrusion 205, and the second protrusion 206 is provided with two second oil passing grooves 208 symmetrically arranged on both sides of the second protrusion 206. The balance protrusion 204 and the first protrusion 205 are provided with a throttling hole 209 in communication with the circular groove 202. In this embodiment, the valve core 2 is provided with a third oil passing groove 210 at each end. In this way, the flow of hydraulic oil is smoother, and the movement of the valve core 2 is more stable. The valve core 2 is placed in the circular hollow hole 104 of the valve sleeve 1 to form the second cavity 6 with the valve sleeve 1; the limiting part 201 of the valve core 2 is placed in the first cavity 5, and the equalizing groove 203 is placed in the second cavity 6. The valve core 2 is externally provided with a return spring 5, which is located in the first cavity 5, so that one end of the return spring 5 abuts against the limiting part 201 of the valve core 2, and the other end abuts against the valve sleeve 1.

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

[0067] In the utility model, the sealing ring 7 is arranged at the connecting position of the valve sleeve 1 and the fixed seat 3, and the sealing ring 7 is arranged at the connecting position of the valve sleeve 1 and the output sleeve 4.

[0068] The working process of the proportional electromagnetic valve is as follows: Figure 29 The assembly diagram of the armature and the proportional electromagnetic valve is as shown in the figure. Figure 30 Figure 31 When the peripheral electromagnetic coil is not working or small current, the inner valve core 2 is pushed to the minimum stroke position of the valve core 2 by the elastic force of the reset spring 5, and the opening between the valve core 2 and the valve sleeve 1 assembly is communicated with the second oil inlet hole 108 and the oil return hole 106. Figure 32 Figure 33 When the peripheral electromagnetic coil is working, the fixed seat 3 generates magnetism, the armature 8 assembly of the outer part is attracted inward to offset the elasticity of the reset spring 5, when the valve core 2 reaches the half stroke state, the oil passage of the valve core 2 is sealed, and at this time, the hydraulic oil is not communicated. Figure 34 Figure 35 When the peripheral electromagnetic coil passes through large current, the magnetism generated by the fixed seat 3 attracts the armature 8 assembly to the maximum stroke, and at this time, the oil passage of the valve core 2 communicates the first oil inlet hole 107 and the second oil inlet hole 108. Because the hydraulic oil pressure difference generated by the size difference of the front and rear oil passages (the first oil passage 207 and the second oil passage 208) of the valve core 2 makes the valve core 2 obtain the counterforce of the thrust of the armature 8 assembly, the valve core 2 can keep moving forward and backward.

[0069] The above embodiments of the utility model are not the limitation of the protection scope of the utility model, and the implementation manner of the utility model is not limited to this, and according to the above content of the utility model, the ordinary skilled in the art can make other various forms of modification, replacement or change to the above structure of the utility model according to the ordinary technical knowledge and conventional means in the art without departing from the above basic technical thought of the utility model, and all should fall within the protection scope of the utility model.​​​

Claims

1. A proportional solenoid valve characterized by comprising: The utility model relates to a valve sleeve (1) is provided with circular hollow hole (104) in, one end closed arrangement, one end open arrangement, the valve sleeve (1) is provided with oil return hole (106), first oil inlet hole (107) and second oil inlet hole (108), each first oil inlet hole (107) with an oil return hole (106) axial correspondence arrangement, each second oil inlet hole (108) with an oil return hole (106) axial correspondence arrangement, Fixed seat (3) is provided with the through -hole (301) of cooperation with armature (8), fixed seat (3) is connected with the open end of valve sleeve (1), forms first cavity (5), Valve core (2) is cylindrical, one end of valve core (2) is provided with limiting piece (201), the other end is provided with equalizing groove (203) outward, valve core (2) is placed in the circular hollow hole (104) of valve sleeve (1), so that equalizing groove (203) is attached with hollow hole (104) side wall, valve core (2) is provided with reset spring (5) outward, reset spring (5) is located in first cavity (5), so that one end of reset spring (5) abuts against valve core (2) limiting piece (201), the other end abuts against valve sleeve (1), Output sleeve (4) is provided with through hole (401) in, the through hole (401) is matched with valve sleeve (1), the side wall of output sleeve (4) is provided with third oil inlet hole (402), output sleeve (4) is provided with third oil inlet hole (402) and first oil inlet hole (107) of valve sleeve (1) correspondence arrangement outward, so that first oil inlet channel is formed between output sleeve (4) and first oil inlet hole (107) of valve sleeve (1), second oil inlet channel is formed between output sleeve (4) and second oil inlet hole (108) of valve sleeve (1). Equalizing groove (203) is arranged by a group of annular grooves with same spacing.

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

3. The proportional solenoid valve according to claim 2, wherein Valve sleeve (1) includes first connecting portion (101), main body portion (102) and second connecting portion (103) connected in sequence, oil return hole (106) is arranged in main body portion (102), first oil inlet hole (107) and second oil inlet hole (108) are arranged in second connecting portion (103), groove (105) is arranged in second connecting portion (103).

4. The proportional solenoid valve according to claim 3, wherein 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.

5. Proportional solenoid valve according to any one of claims 1 to 4, characterized in that Balancing protrusion (204) is arranged in the middle of valve core (2), the cross section of balancing protrusion (204) is equilateral triangle, three corners are arranged with circular arc, the circular arc part is connected with the inner wall of circular hollow hole (104) of valve sleeve (1).

6. Proportional solenoid valve according to any one of claims 1 to 4, characterized in that ​ 7. The proportional solenoid valve according to claim 6, wherein 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 passing groove (207), the second protrusion (206) is provided with a second oil passing groove (208), and the outer diameter of the first protrusion (205) is larger than that of the second protrusion (206).

8. The proportional solenoid valve according to claim 7, wherein The valve core (2) is provided with a slot hole (202), and a throttling hole (209) is arranged between the balance protrusion (204) and the first protrusion (205), and the throttling hole (209) is communicated with the slot hole (202).

9. The proportional solenoid valve according to claim 8, wherein The valve core (2) is respectively provided with a third oil passing groove (210) at both ends.

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