Hydraulic valve

Abstract

The hydraulic valve comprises an electromagnet assembly (101) and a valve assembly (102) driven and controlled by the electromagnet assembly (101), the electromagnet assembly (101) comprises a magnetism isolating sleeve (1) installed on a pole shoe (5), a movable iron core (4) is arranged in the magnetism isolating sleeve (1) in a sliding mode, and a push rod (6) fixedly connected to the movable iron core (4) penetrates through the pole shoe (5) and then makes contact with a valve element of the valve assembly (102). A coil assembly (2) is sleeved outside the magnetic isolation sleeve (1), and the magnetic isolation sleeve is characterized in that at least two spiral grooves (4.1) penetrating from bottom to top are symmetrically arranged on the outer wall of the movable iron core (4). The hydraulic valve has the advantages of being easy and efficient to machine and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of hydraulic valves, in particular to a kind of hydraulic valves, moving iron core can be realized shaft centering by rotation, belong to valve technical field. BACKGROUND

[0002] At present, hydraulic proportional valve is often used on engineering machinery vehicle, moving iron core is driven by electromagnetic assembly, and then linkage push rod is used to realize the opening and closing of valve core. In the production process of conventional hydraulic valve, it is found that, because the valve rod is long, and the valve rod needs to pass through the pole shoe to drive the valve core of valve assembly, in order to make the valve rod more stable in axial movement, it is necessary to form a guide fit between the valve rod and the perforation on the pole shoe, and the concentricity between the two is required to be high, and a little processing error will cause the valve rod to scratch the perforation on the pole shoe during axial movement, which not only affects the response characteristic curve, but also greatly increases the friction and reduces the service life.

[0003] Therefore, the company is inspired by the disclosure of "moving iron core rotatable fuel metering valve" in Chinese patent CN201610814945.6, which uses a slowly rotating moving iron core to make the friction around the moving iron core uniform, and the present patent further ensures the concentricity of the valve rod based on the above moving iron core rotation method, thereby reducing the processing precision. SUMMARY

[0004] The utility model aims at overcoming the above-mentioned insufficient, provide a kind of hydraulic valve that simple and efficient and cost is low, it realizes automatic centering using the rotation of moving iron core.

[0005] The utility model aims at overcoming the above-mentioned insufficient, provide a kind of hydraulic valve that simple and efficient and cost is low, it realizes automatic centering using the rotation of moving iron core.

[0006] A kind of hydraulic valve, it includes electromagnetic assembly and the valve assembly driven and controlled by electromagnetic assembly, the electromagnetic assembly includes the magnetic shield sleeve installed on pole shoe, the dynamic iron core is slidably arranged in the magnetic shield sleeve, the push rod fixedly connected on the dynamic iron core passes through pole shoe and is in contact with the valve core of valve assembly, the magnetic shield sleeve is equipped with coil assembly, at least two spiral grooves are symmetrically provided on the outer wall of the dynamic iron core and are penetrated from bottom to top.

[0007] Preferably, the hole diameter of the through hole on the pole shoe for the push rod to pass through is greater than the diameter of the push rod.

[0008] Preferably, the top of the valve core of valve assembly is provided with a counterbore, the opening end of the counterbore is located below the bottom surface of the push rod, and the area of the opening end of the counterbore is smaller than the area of the bottom surface of the push rod.

[0009] Preferably, the lead-out wire connection terminal of the coil assembly is injection molded to form a plug-in piece wrapping the entire coil assembly.

[0010] Preferably, a pre-buried nut is embedded on the top gland of the magnetic isolation sleeve, and the adjusting screw screwed into the pre-buried nut abuts against the top of the moving iron core after passing through the gland and the magnetic isolation sleeve.

[0011] Compared with the prior art, the utility model has the beneficial effects that:

[0012] The utility model discloses based on the conception of the moving iron core rotation makes the moving iron core high -speed rotation, and further produces gyro effect to make the push rod fixed on the moving iron core steadyly point to the same fixed direction, and the hole diameter of the perforation on the pole shoe is obviously greater than the diameter of the push rod at this time, and need not be as the same as the push rod's diameter basically of the comparative patent to keep consistent, thereby make the processing precision requirement of this patent greatly reduce, greatly reduce the processing difficulty, improve the processing efficiency, reduce the processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a hydraulic valve's structural schematic diagram for the utility model.

[0014] Figure 2 It is another embodiment drawing of a hydraulic valve for the utility model.

[0015] Figure 3 It is the structure schematic diagram of the moving iron in the utility model.

[0016] Among them:

[0017] Electromagnet assembly 101, valve assembly 102 (on-off valve), counterbore 103;

[0018] Magnetic isolation sleeve 1, coil assembly 2, plug-in part 3, moving iron core 4, pole shoe 5, push rod 6, top gland 7, pre-buried nut 8, adjusting screw 9;

[0019] Spiral groove 4.1. DETAILED DESCRIPTION Example one:

[0020] See Figure 1The utility model relates to a kind of hydraulic valves, including electromagnet assembly 101 and the valve assembly 102 driven and controlled by electromagnet assembly 101, the electromagnet assembly 101 includes the magnetic shield sleeve 1 installed on pole shoe 5, the dynamic core 4 is slidably arranged in the magnetic shield sleeve 1, the push rod 6 fixedly connected on the dynamic core 4 is contacted with the valve core of valve assembly 102 after passing through pole shoe 5, the magnetic shield sleeve 1 is equipped with coil assembly 2, the terminal of the outgoing line of coil assembly 2 is injection molded after forming with the plug connector 3 that wraps entire coil assembly 2;The outer wall of the dynamic core 4 is symmetrically provided with at least two spiral grooves 4.1 (as shown in Fig. Figure 3 When coil assembly 2 drives dynamic core 4 to move axially up and down, oil forms tangent direction propulsive force through spiral groove 4.1, in turn, dynamic core 4 is propelled to move at high speed in a circular manner, in turn, push rod 6 fixedly connected on dynamic core 4 is stably pointed to a fixed direction through gyroscopic effect, and the aperture of the through hole on pole shoe 5 is larger than the diameter of push rod 6, the two do not need to contact, and the angular momentum balance generated by rotation can ensure the stability of push rod 6, and the top of the valve core of valve assembly 102 is provided with a counterbore 103, the area of the opening end of counterbore 103 is smaller than the area of the bottom surface of push rod 6, and the bottom surface of push rod 6 is pressed on counterbore 103, so as to facilitate reducing the contact area between the bottom surface of push rod 6 and the top surface of the valve core of valve assembly 102, and facilitating reducing the occurrence of viscous phenomenon, so as to avoid affecting the rotation of push rod 6 and affecting response curve.

[0021] Meanwhile, the gap formed between the outer wall of push rod 6 and the inner wall of the through hole on pole shoe 5 is also beneficial to the rapid import and export of oil, in turn, dynamic core 4 can be pushed and rotated in time and quickly, and the comparative patent cited in the background art lacks the gap, which cannot make oil flow quickly, and the slot in the comparative patent does not penetrate, so the rotation effect is general, and the response is not fast enough. Example two:

[0022] Referring to Figure 2 Example two is to increase assembly structure function on the basis of example one, at this time, a pre-buried nut 8 is embedded on the top of the magnetic shield sleeve 1, and the adjusting screw rod 9 screwed into the pre-buried nut 8 abuts against the top of the dynamic core 4 after passing through the gland 7 and the magnetic shield sleeve 1, so that the initial state position of the dynamic core 4 can be fine-tuned after complete assembly by using the adjusting screw rod 9, which greatly facilitates assembly.

[0023] In addition: It should be noted that the above specific embodiments are only an optimized scheme of the patent, and any change or improvement made by the person skilled in the art according to the above concept is within the protection scope of the patent.

Claims

1. A hydraulic valve comprising an electromagnet assembly (101) and a valve assembly (102) driven and controlled by the electromagnet assembly (101), wherein the electromagnet assembly (101) comprises a magnetic shield sleeve (1) mounted on a pole shoe (5), a moving iron core (4) is slidably arranged in the magnetic shield sleeve (1), a push rod (6) fixedly connected to the moving iron core (4) is in contact with a valve core of the valve assembly (102) after passing through the pole shoe (5), and a coil assembly (2) is sleeved outside the magnetic shield sleeve (1), characterized in that: The outer wall of the moving iron core (4) is symmetrically provided with at least two spiral grooves (4.1) penetrating from bottom to top.

2. The hydraulic valve of claim 1, wherein: The hole diameter of the through hole of the pole shoe (5) for the push rod (6) is larger than the diameter of the push rod (6).

3. The hydraulic valve of claim 1, wherein: The top of the valve core of the valve assembly (102) is provided with a counterbore (103), the opening end of the counterbore (103) is below the bottom surface of the push rod (6), and the area of the opening end of the counterbore (103) is smaller than the area of the bottom surface of the push rod (6).

4. The hydraulic valve of claim 1, wherein: The lead-out wire connection terminal of the coil assembly (2) is injection molded with a plug-in part (3) wrapping the entire coil assembly (2).

5. The hydraulic valve of claim 1, wherein: The top gland (7) of the magnetic isolation sleeve (1) is embedded with a pre-embedded nut (8), the adjusting screw (9) screwed into the pre-embedded nut (8) abuts against the top of the moving iron core (4) after penetrating through the gland (7) and the magnetic isolation sleeve (1).

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