Small-size low-flow-resistance engine oil electromagnetic valve

Abstract

The utility model provides a small-size low-flow-resistance engine oil electromagnetic valve, a central through hole is formed in a movable iron core, a lower hole section accommodates and abuts against the top of a spring, and a spring accommodating cavity formed in the center of the top of a static iron core accommodates and abuts against the bottom of the spring; a central through hole is formed in the valve sleeve, an A port hole penetrating through the hole wall in the radial direction is formed in the hole wall, close to the conical surface section, of the sliding section of the movable iron core, the movable iron core is slidably sleeved with the sliding section of the movable iron core, and the P port inlet section is coaxially communicated with the central through hole of the movable iron core all the time. A conical surface section communicated between the P port inlet section and each A port hole is sealed and blocked by the top end of the iron core; an isolation cavity is defined by the isolation sleeve, the bottom end face of the valve sleeve in the isolation sleeve and the upper end face of the static iron core, and the P opening inlet section of the valve sleeve and the isolation cavity can be always communicated through the center through hole of the movable iron core. According to the utility model, the volume is miniaturized, the low flow resistance and large flow are realized, the assembly is convenient, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic valves, in particular to a small-volume and low-flow-resistance engine oil electromagnetic valve. Background Art

[0002] With the upgrade of power and speed of traditional motors, the heat generated by motors of new energy electric vehicles increases due to the increase in power. Traditional air cooling and liquid cooling methods can no longer meet the heat dissipation needs of motors. The oil-cooled motor technology route has also become the development trend of motors of new energy vehicles. Due to the characteristics of engine oil, the timing and working conditions of engine oil entering the motor need to be controlled by a valve group, so the demand for oil solenoid valves in oil-cooled motors is increasing. However, due to the spatial layout and pipeline limitations of the motor, the solenoid valve needs to be as small as possible, but the diameter of the solenoid valve affects the heat dissipation efficiency and has certain flow resistance requirements. Therefore, it is necessary to develop an oil solenoid valve with small size, low flow resistance and large flow. Utility Model Content

[0003] In view of the problems existing in the prior art, the utility model provides the following technical solutions:

[0004] A small-volume, low-flow-resistance oil solenoid valve is characterized in that the moving iron core is provided with a central through hole, wherein the central through hole is divided from top to bottom into an upper hole section, a middle hole section, and a lower hole section which are connected in sequence coaxially, the aperture of the middle hole section is smaller than the aperture of the lower hole section, and an annular first shoulder surface is formed at the connection between the middle hole section and the lower hole section, the lower hole section accommodates the top of the spring, and the top of the spring abuts against the first shoulder surface; a spring accommodating cavity opened at the top center of the static iron core accommodates and abuts against the bottom of the spring;

[0005] The valve sleeve is provided with a central through hole, wherein the central through hole is divided into a P-port inlet section, a conical surface section, and a moving iron core sliding section which are connected coaxially from top to bottom in sequence; four A-port holes are arranged around the center on the hole wall near the conical surface section of the moving iron core sliding section, respectively penetrating the hole wall in a radial direction and connected to the central through hole; the moving iron core is sleeved in the moving iron core sliding section and sealed and slidably cooperated therewith; the P-port inlet section is always coaxially connected to the central through hole of the moving iron core, and when the top end of the moving iron core abuts against the conical surface section, the conical surface section connected between the P-port inlet section and each A-port hole is sealed and blocked by the top end of the moving iron core;

[0006] The isolation sleeve is placed in the solenoid sleeve hole, and the upper and lower parts of the isolation sleeve are respectively sleeved on the bottom of the valve sleeve and the upper part of the static iron core, so that an isolation cavity is jointly formed by the isolation sleeve and the bottom end face of the valve sleeve maintaining a certain isolation gap and the upper end face of the static iron core, and the P-port inlet section of the valve sleeve and the isolation cavity can always remain connected through the central through hole of the moving iron core.

[0007] Furthermore, an isolation upper shoulder is formed on the outer periphery of the bottom of the valve sleeve, and an isolation lower shoulder is formed on the outer periphery of the upper part of the static iron core. The upper part of the isolation sleeve is sleeved outside the bottom of the valve sleeve, and the lower part of the isolation sleeve is sleeved outside the upper part of the static iron core. The upper end of the isolation sleeve abuts against the isolation upper shoulder, and the lower end of the isolation sleeve abuts against the isolation lower shoulder, so that the isolation sleeve forms and maintains a certain isolation gap between the bottom end face of the valve sleeve and the upper end face of the static iron core, and a sealed isolation cavity is jointly formed by the isolation sleeve and the bottom end face of the valve sleeve and the upper end face of the static iron core.

[0008] Furthermore, the aperture of the upper hole section of the moving iron core is larger than that of the middle hole section, and an annular shoulder surface is also formed at the junction of the upper hole section and the middle hole section.

[0009] Furthermore, an annular groove is arranged outside the moving iron core, and a sealing member may or may not be placed in the annular groove according to the situation.

[0010] Furthermore, the top peripheral edge of the moving iron core is formed into a rounded corner matching the conical surface segment.

[0011] Furthermore, the hole wall at the bottom end of the valve sleeve in the isolation sleeve is made into a chamfer with a wall thickness gradually decreasing from top to bottom.

[0012] Furthermore, the bottom surface of the spring accommodating cavity is higher than or coincides with the plane where the lower isolation shoulder is located.

[0013] Furthermore, the overall axial length of the moving iron core should satisfy the following requirements: it should be smaller than the axial length of the moving iron core sliding section of the valve sleeve, and when the bottom end of the moving iron core drops to abut against the top end of the static iron core, the top end of the moving iron core is located below the A hole.

[0014] Furthermore, the valve sleeve, the outer shell, the front yoke sleeve, the moving iron core and the static iron core are magnetic conductive components, and the isolation sleeve is a non-magnetic conductive component.

[0015] Furthermore, the spring is made of stainless steel which is non-magnetic.

[0016] The structural design of the central through hole of the moving iron core of the utility model connecting the P port with the isolation cavity reduces the liquid pressure, while reducing the initial pressure of the spring and the demand for electromagnetic force. The size and number of turns of the electromagnetic part can be effectively reduced, while simplifying the structure. While miniaturizing the volume, it also achieves low flow resistance and large flow, facilitates assembly, and reduces manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute an improper limitation on the present invention. A person of ordinary skill in the art can obtain other relevant drawings based on these drawings without making any creative effort.

[0018] Figure 1 It is the front view of the utility model;

[0019] Figure 2 for Figure 1 AA section view in FIG.

[0020] Figure 3 Explosion diagram.

[0021] Reference numerals in the figures:

[0022] Moving iron core 1; valve sleeve 2; housing 3; isolation sleeve 4; static iron core 5; spring 6; solenoid 7; front yoke sleeve 8; sealing ring 9; sealing ring 10;

[0023] Annular groove 11; upper hole section 12; middle hole section 13; lower hole section 14; first shoulder surface 15;

[0024] P port entrance section 21; moving iron core sliding section 22; conical surface section 23; A port hole 24; isolation upper shoulder 25; chamfer 26;

[0025] An isolation chamber 40;

[0026] Spring accommodating chamber 51; isolation lower shoulder 52. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0028] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the application product is usually placed when in use, or is the orientation or position relationship commonly understood by technical personnel in this field. It is only for the convenience of describing the present invention or simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] The term "plurality" in the present invention refers to more than two (including two). The terms "first", "second" and the like are only used to distinguish descriptions and should not be understood as indicating or implying relative importance.

[0030] Unless otherwise clearly specified and limited, the terms "setting", "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0032] As shown in the figure, the utility model is mainly composed of the following components: a moving iron core 1, a valve sleeve 2, a housing 3, an isolation sleeve 4, a static iron core 5, a spring 6, a solenoid 7, and a front yoke sleeve 8.

[0033] Among them, the valve sleeve 2, the housing 3, the front yoke sleeve 8, the moving iron core 1, and the static iron core 5 are magnetic conductive parts, the isolation sleeve 4 is a non-magnetic conductive part, and the spring 6 is also made of non-magnetic stainless steel. The moving iron core 1 is an integrated machined part, and a stepped central through hole is formed in the center. The central through hole is used for oil to connect the upper and lower ends of the moving iron core 1.

[0034] On the other hand, the central through hole is divided from top to bottom into an upper hole section 12, a middle hole section 13, and a lower hole section 14 which are coaxially connected in sequence. The aperture of the middle hole section 13 is smaller than the apertures of the upper hole section 12 and the lower hole section 14, so that an annular first shoulder surface 15 is formed at the connection between the middle hole section 13 and the lower hole section 14. The lower hole section 14 accommodates the top of the spring 6, and the top of the spring 6 abuts against the first shoulder surface 15.

[0035] Furthermore, the aperture of the upper hole section 12 is made larger than the aperture of the middle hole section 13, which is not only for the convenience of processing the middle hole section, but also for minimizing the flow resistance of the center through hole to the oil when passing through the center through hole. At the same time, it reduces the overall mass of the moving iron core and has a certain accelerating effect on the speed of the moving iron core 1 moving downward when power is turned on.

[0036] Preferably, an annular groove 11 may be provided on the outside of the moving iron core 1. A seal may be placed in the annular groove or not according to sealing requirements. The seal may be an O-ring or a Gly ring, etc., to enhance the sealing performance of the sliding connection between the moving iron core 1 and the valve sleeve 2.

[0037] A central through hole is provided at the center of the valve sleeve 2, and the central through hole is divided into a P-port inlet section 21, a conical section 23, and a moving iron core sliding section 22 which are coaxially connected in sequence from top to bottom; a plurality of A-port holes 24 which radially penetrate the hole wall and are connected to the central through hole are provided around the central axis on the hole wall of the moving iron core sliding section 22 near the conical section 23; the moving iron core 1 is sleeved in the moving iron core sliding section 22 and sealed and slidably cooperated therewith; the P-port inlet section 21 is always coaxially connected to the central through hole of the moving iron core 1, and when the top end of the moving iron core 1 abuts against the conical section 23, the conical section 23 connected between the P-port inlet section 21 and each A-port hole 24 is sealed and blocked by the top end of the moving iron core 1; preferably, in order to enhance the sealing and blocking effect, the top periphery of the moving iron core 1 is made into a chamfered corner matching the conical section 23.

[0038] An isolation upper shoulder 25 is formed on the outer periphery of the bottom of the valve sleeve 2, and an isolation lower shoulder 52 is formed on the outer periphery of the upper part of the static iron core 5. The upper part of the isolation sleeve 4 is sleeved outside the bottom of the valve sleeve 2, and the lower part of the isolation sleeve 4 is sleeved outside the upper part of the static iron core 4. The upper end of the isolation sleeve 4 abuts against the isolation upper shoulder 25, and the lower end of the isolation sleeve 4 abuts against the isolation lower shoulder 52. The isolation sleeve 4 forms and maintains a certain isolation gap between the bottom end face of the valve sleeve 2 and the upper end face of the static iron core 5 therein, so that the isolation sleeve 4 and the bottom end face of the valve sleeve 2 and the upper end face of the static iron core 5 therein jointly form a sealed isolation cavity 40. The purpose of this isolation gap is to increase the main magnetic flux and thereby enhance the magnetic attraction to the moving iron core.

[0039] More importantly, the P-port inlet section 21 of the valve sleeve 2 and the isolation cavity 40 can always be connected through the central through hole of the moving iron core 1 .

[0040] Preferably, the hole wall at the bottom end of the valve sleeve 2 in the isolation sleeve 4 is made into a chamfer 26 with a wall thickness gradually decreasing from top to bottom. The chamfer shape can be as follows: Figure 2 The conical chamfer shown in the figure may also be rounded, which can facilitate the bottom of the valve sleeve 2 to be inserted into the isolation sleeve 4 and also increase the magnetic attraction to the moving iron core.

[0041] like Figure 2 As shown, a spring accommodating cavity 51 for accommodating the bottom of the spring 6 is opened at the top center of the static iron core 5. Preferably, the bottom surface of the spring accommodating cavity 51 is higher than or coincides with the plane where the isolation lower shoulder 52 is located, thereby ensuring that the bottom end of the spring does not protrude from the surface where the lower end sleeve of the isolation sleeve 4 is located.

[0042] The overall axial length of the moving iron core 1 should meet the following requirements: it should be smaller than the axial length of the moving iron core sliding section 22 of the valve sleeve 2, and when the bottom end of the moving iron core 1 drops to abut against the top end of the static iron core, the top end of the moving iron core 1 is lower than the lowest position of the A-port hole 24, that is, the top end of the moving iron core 1 is located below the A-port hole 24, so that the P-port inlet section 21 of the valve sleeve 2 is connected with each A-port hole 24, and since there are multiple A-port holes 24 (in this embodiment, the number of A-port holes 24 is four), the total channel area can even be larger than the area of ​​the P-port inlet section 21, thereby greatly reducing the flow resistance and relatively increasing the overall flow of the solenoid valve, that is, achieving maximized low flow resistance and large flow in a small volume.

[0043] After the isolation sleeve 4, valve sleeve 2 and static iron core 5 are press-fitted by interference, they are laser welded into a whole to enhance the overall strength and sealing. The moving iron core 1 is inserted into the moving iron core sliding section 22 of the valve sleeve 2 in the welding sub-assembly, and the welding sub-assembly is sleeved in the solenoid 7 sub-assembly, which is then sleeved in the housing 3. After the front yoke sleeve 8 is assembled to the radial protrusion of the valve sleeve 2, the protrusion of the housing 3 (not shown) is riveted to the end face of the front yoke sleeve 8.

[0044] Working principle:

[0045] The pressure oil flows in from the P-port inlet section 21 of the valve sleeve, passes through the central through hole of the moving iron core 1, and enters the isolation chamber 40 below it; when the solenoid 7 of the electromagnetic valve is not energized, the hydraulic pressure and the spring force make the upper end surface of the moving iron core 1 fit the conical surface of the conical surface section 23 of the valve sleeve to form a conical surface seal, and at the same time, the sealing ring between the valve sleeve 2 and the moving iron core 1 at the annular groove 11 remains sealed, and the hydraulic oil input from the P-port inlet section 21 cannot flow into the A-port hole 24.

[0046] When the solenoid valve is energized, the moving iron core 1 is acted upon by the electromagnetic force, overcomes the spring force and the hydraulic pressure and moves downward, the conical surface of the valve sleeve conical surface section 23 and the upper end surface of the moving iron core 1 are separated, and the oil in the P port inlet section 21 flows from the opening into the A port hole 24; after the power is turned off, the spring resets it.

[0047] The above description is only 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 should be included in the protection scope of the present invention.

Claims

1. Small volume and low flow resistance oil solenoid valve, characterized by: The moving iron core is provided with a central through hole, wherein the central through hole is divided from top to bottom into an upper hole section, a middle hole section and a lower hole section which are connected in sequence with the same axis. The aperture of the middle hole section is smaller than that of the lower hole section. An annular first shoulder surface is formed at the connection between the middle hole section and the lower hole section. The lower hole section accommodates the top of the spring, and the top of the spring abuts against the first shoulder surface. The spring accommodating cavity opened at the top center of the static iron core accommodates and abuts against the bottom of the spring. The valve sleeve is provided with a central through hole, wherein the central through hole is divided into a P-port inlet section, a conical surface section, and a moving iron core sliding section which are connected coaxially from top to bottom in sequence; four A-port holes are arranged around the center on the hole wall near the conical surface section of the moving iron core sliding section, respectively penetrating the hole wall in a radial direction and connected to the central through hole; the moving iron core is sleeved in the moving iron core sliding section and sealed and slidably cooperated therewith; the P-port inlet section is always coaxially connected to the central through hole of the moving iron core, and when the top end of the moving iron core abuts against the conical surface section, the conical surface section connected between the P-port inlet section and each A-port hole is sealed and blocked by the top end of the moving iron core; The isolation sleeve is placed in the solenoid sleeve hole, and the upper and lower parts of the isolation sleeve are respectively sleeved on the bottom of the valve sleeve and the upper part of the static iron core, so that an isolation cavity is jointly formed by the isolation sleeve and the bottom end face of the valve sleeve maintaining a certain isolation gap and the upper end face of the static iron core, and the P-port inlet section of the valve sleeve and the isolation cavity can always remain connected through the central through hole of the moving iron core.

2. The small-volume, low-flow-resistance oil solenoid valve according to claim 1, characterized in that: An upper isolation shoulder is formed on the outer periphery of the bottom of the valve sleeve, and an lower isolation shoulder is formed on the outer periphery of the upper part of the static iron core. The upper part of the isolation sleeve is sleeved outside the bottom of the valve sleeve, and the lower part of the isolation sleeve is sleeved outside the upper part of the static iron core. The upper end of the isolation sleeve abuts against the upper isolation shoulder, and the lower end of the isolation sleeve abuts against the lower isolation shoulder, so that the isolation sleeve forms and maintains a certain isolation gap between the bottom end face of the valve sleeve and the upper end face of the static iron core, and the isolation sleeve and the bottom end face of the valve sleeve and the upper end face of the static iron core together form a sealed isolation cavity.

3. The small-volume, low-flow-resistance oil solenoid valve according to claim 1, characterized in that: The aperture of the upper hole section of the moving iron core is larger than that of the middle hole section, and an annular shoulder surface is also formed at the junction of the upper hole section and the middle hole section.

4. The small-volume, low-flow-resistance oil solenoid valve according to claim 1, characterized in that: An annular groove is arranged on the outside of the moving iron core.

5. The small-volume, low-flow-resistance oil solenoid valve according to claim 1, characterized in that: The top periphery of the moving iron core is formed into a rounded corner matching the conical surface section.

6. The small-volume, low-flow-resistance oil solenoid valve according to claim 1, characterized in that: The hole wall at the bottom end of the valve sleeve in the isolation sleeve is made into a chamfer with a wall thickness gradually decreasing from top to bottom.

7. The small-volume, low-flow-resistance oil solenoid valve according to claim 1, characterized in that: The bottom surface of the spring accommodating cavity is higher than or coincides with the plane where the lower isolation shoulder is located.

8. The small-volume, low-flow-resistance oil solenoid valve according to claim 1, characterized in that: The overall axial length of the moving iron core should meet the following requirements: it should be smaller than the axial length of the moving iron core sliding section of the valve sleeve, and when the bottom end of the moving iron core drops to abut against the top end of the static iron core, the top end of the moving iron core is located below the A hole.

9. The small-volume, low-flow-resistance oil solenoid valve according to claim 1, characterized in that: The valve sleeve, the outer shell, the front yoke sleeve, the moving iron core and the static iron core are magnetic conductive parts, and the isolation sleeve is a non-magnetic conductive part.

10. The small-volume, low-flow-resistance oil solenoid valve according to claim 1, characterized in that: The spring is made of stainless steel which is non-magnetic.

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