2D electromagnetic valve adopting worm gear and worm for transmission

Abstract

The invention relates to the technical field of electromagnetic valves, in particular to a 2D electromagnetic valve adopting worm and gear transmission, which comprises a driving part and a valve body, the output end of the driving part is provided with a worm, the middle position of the valve body is provided with a valve core, the end part of the valve core is provided with a fan-shaped worm gear connected with the worm, and the worm gear is connected with the worm. A high-pressure cavity, a low-pressure cavity, a balance cavity and a sensitive cavity are formed in the valve body, an adjusting hole is formed in the middle of the valve element, an oil inlet and an oil outlet are formed in the bottom of the valve body and communicated with the high-pressure cavity, and isolation tables are arranged among the high-pressure cavity, the low-pressure cavity, the balance cavity and the sensitive cavity. When the electromagnetic valve is powered off, the turbine and the valve element keep the current positions unchanged and cannot rotate due to the action of external force, so that the electromagnetic valve can still stably output the adjusted flow after being powered off, the requirement of equipment with the high flow control requirement is met, the use safety is greatly improved, and the use effect is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic valves, in particular to a 2D electromagnetic valve adopting worm gear transmission. BACKGROUND

[0002] The 2D electromagnetic valve is a structure frequently used and is widely applied to the field of electro-hydraulic control, and is usually used for changing the flow direction of fluid in industrial equipment. The existing electromagnetic reversing valve usually comprises a valve body, a valve core and a reversing assembly. Under the condition of power-on, the electromagnetic reversing assembly can drive the valve core to move, so as to change the flow direction of fluid in the valve body. The existing electromagnetic valve is usually directly driven by a motor in use. In the event of power failure in use, the valve core inside the electromagnetic valve will be uncontrollable, resulting in uncontrollable flow. For equipment with high flow control requirements, damage will occur, especially in the fields of chemical industry and aerospace technology, and the consequences and losses are more serious. SUMMARY

[0003] The present application aims to overcome the deficiency that the existing electromagnetic valve cannot maintain stable flow delivery in unexpected situations, and provides a 2D electromagnetic valve adopting worm gear transmission.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the present application specifically adopts the following technical scheme: a 2D electromagnetic valve adopting worm gear transmission, comprising a driving part and a valve body, wherein the output end of the driving part is provided with a worm, the middle position of the valve body is provided with a valve core, the end of the valve core is provided with a turbine connected with the worm, the turbine is a fan shape, the inside of the valve body is provided with a high-pressure cavity, a low-pressure cavity, a balance cavity and a sensitive cavity, the middle of the valve core is provided with an adjusting hole, the bottom of the valve body is provided with an oil inlet and an oil outlet in communication with the high-pressure cavity, and a separation table is arranged between the high-pressure cavity, the low-pressure cavity, the balance cavity and the sensitive cavity.

[0005] Further, a sealing ring is arranged on the side surface of the separation table, and a pressure relief port in communication with the outside is arranged on the side wall of the low-pressure cavity.

[0006] Further, the end of the valve core is provided with an adjusting port for adjusting the flow, and an adjusting groove matched with the adjusting port is arranged on the side wall of the sensitive cavity.

[0007] Further, the end of the valve body is provided with a positioning cavity, two positioning washers are arranged inside the positioning cavity, a spring is arranged between the two positioning washers, and the spring is arranged on the outside of the valve core.

[0008] Further, the driving part is a stepping motor, and the minimum rotation angle of the worm is 1.8 degrees.

[0009] Further, the axial displacement distance of the valve core is less than 0.9mm.

[0010] The beneficial effects of the embodiment of the present application are that: the valve body is internally designed with a high-pressure cavity, a low-pressure cavity, a balance cavity and a sensitive cavity, the cavities are separated by the isolation table arranged on the valve core, the meshing relationship between the worm and the turbine makes the worm only need a small torque to drive the turbine to rotate, and then drive the valve core to rotate, in addition, the worm and gear transmission also has the characteristics of reverse stroke self-locking, that is, when the worm stops rotating, the turbine and the valve core will remain the current position unchanged, and will not rotate due to external force, this feature makes the solenoid valve can still output the adjusted flow after power off, meets the demand of high flow control requirement equipment, greatly improves the use safety, and guarantees the use effect. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a schematic diagram of the overall structure of the present application;

[0012] Figure 2 is another angle structure schematic diagram of the present application;

[0013] Figure 3 is a schematic diagram of the cross-sectional structure of the present application;

[0014] Figure 4 is a schematic diagram of the valve core structure of the present application;

[0015] In the figure: 1, stepper motor; 101, worm; 2, valve body; 201, turbine; 202, pressure relief port; 203, oil outlet; 204, oil inlet; 3, valve core; 301, balance cavity; 302, low-pressure cavity; 303, high-pressure cavity; 304, sensitive cavity; 4, adjusting hole; 401, adjusting port; 5, spring; 6, isolation table. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present application will be described below with reference to the accompanying drawings, and those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0017] See Figures 1 to 3The embodiment of the application discloses a 2D electromagnetic valve driven by a worm gear 101, which mainly comprises a driving part and a valve body 2, the driving part adopts a stepping motor 1 as a power source, the output end of the driving part is provided with the worm gear 101, the worm gear 101 is fixed on the rotating shaft of the stepping motor 1 through laser welding technology, synchronous rotation between the worm gear 101 and the rotating shaft of the stepping motor 1 is ensured, the valve body 2 part comprises a valve core 3, an end cover, a valve body 2 sealing element and a series of auxiliary components, the valve core 3 is located at the middle position of the valve body 2, the end of the valve core 3 is provided with a sector turbine 201 meshing with the worm gear 101, the turbine 201 is also fixed on the valve core 3 through laser welding, synchronous rotation of the worm gear and the valve core 3 is ensured, and the end cover is used for sealing and ensuring the use effect of the valve body 2.

[0018] The valve body 2 is internally designed with a high-pressure cavity 303, a low-pressure cavity 302, a balance cavity 301 and a sensitive cavity 304, the cavities are separated through an isolation table 6 arranged on the valve core 3, a sealing ring is arranged on the side surface of the isolation table 6, so that the hydraulic oil in different cavities is prevented from leaking, and the use effect of the valve core 3 after moving in the axial direction by a certain distance is ensured, a pressure relief port 202 in communication with the outside is further arranged on the side wall of the low-pressure cavity 302, and is used for adjusting the pressure of the low-pressure cavity 302. The axial position of the valve core 3 is provided with an adjusting hole 4, the adjusting hole 4 is provided with an outlet in the inside of each cavity, and an adjusting port 401 is arranged in the inside of the sensitive cavity 304, the flow size of the adjusting port 401 is controlled by rotating the valve core 3, the liquid flow entering the inside of the sensitive cavity 304 is controlled, the acting force of the sensitive cavity 304 on the valve core 3 is adjusted, the bottom of the valve body 2 is provided with an oil inlet 204 and an oil outlet 203, which are in communication with the high-pressure cavity 303, and provide the input and output channels of the hydraulic oil for the electromagnetic valve, and the conventional use is in the use scene of fuel, refrigerant and hydraulic oil and the like needing to maintain continuous output under specific use conditions, so that the use safety is greatly ensured and the use effect is improved.

[0019] The end of the valve core 3 is used for adjusting the adjusting port 401, and the side wall of the sensitive cavity 304 is provided with an adjusting groove matched with the adjusting port 401. The adjusting port 401 is provided with at least two, and the diameters of the two adjusting ports 401 are different. Specifically, the high-pressure hole and the low-pressure hole on the sensitive cavity 304 of the valve core 3 and the inclined groove on the valve body 2 form a hydraulic resistance half-bridge. At this time, the pressure of the sensitive cavity 304 is half of the system pressure, and the balance cavity 301 at the other end of the valve core 3 is the system pressure and the pressure acting area is half of the sensitive cavity 304. At this time, the valve core 3 is balanced under the action of the hydraulic pressure in the axial direction. When the valve core 3 rotates, the opening amount of the high-pressure hole and the low-pressure hole on the sensitive cavity 304 changes, so that the pressure of the sensitive cavity 304 is no longer half of the system pressure. At this time, the valve core 3 moves axially to realize the reversing function of the electromagnetic valve. Therefore, the accurate control of the axial displacement of the valve core 3 can be realized by controlling the rotation angle of the valve core 3. The specific principle is that when the valve core 3 rotates, the relative position between the adjusting port 401 and the adjusting groove changes. Through the cooperation between the adjusting port 401 and the adjusting groove, one adjusting port 401 is always connected with the sensitive cavity 304 when the valve core 3 rotates. However, the flow rates through the two adjusting ports 401 are different. By changing the flow rate of the adjusting port 401 entering the sensitive cavity 304, the pressure of the sensitive cavity 304 is changed, and then the axial displacement of the valve core 3 is affected. The end of the valve body 2 is also provided with a positioning cavity, and two positioning washers are installed in the positioning cavity. A spring 5 is arranged between the two positioning washers and is arranged outside the valve core 3. The spring 5 provides an initial axial positioning force for the valve core 3, reduces the operation difficulty during installation, and improves the use effect.

[0020] The worm gear 101 transmission mechanism has the characteristics of high reliability and high stability. The meshing relationship between the worm 101 and the turbine 201 enables the worm 101 to drive the turbine 201 to rotate only by a small torque, and then drives the valve core 3 to rotate. In addition, the worm gear 101 transmission also has the characteristics of reverse stroke self-locking, that is, when the worm 101 stops rotating, the turbine 201 and the valve core 3 will remain unchanged, and will not rotate due to external force. This characteristic enables the electromagnetic valve to still stably output the adjusted flow after power failure, meeting the demand of high flow control requirement equipment.

[0021] When the stepper motor 1 is powered, its rotating shaft drives the worm 101 to rotate accurately by a certain angle, the rotation of the worm 101 is transmitted to the turbine 201 through the meshing relationship, and in turn drives the valve core 3 to rotate. In the conventional use, the pressure between the oil inlet 204, the oil outlet 203, the adjusting port 401, the adjusting hole 4 and each wall body is equal, at this time, the stable work is maintained. When it is necessary to adjust the flow of the oil outlet 203, the pressure of the sensitive cavity 304 will change during the rotation of the valve core 3 driven by the stepper motor 1, resulting in that the force on both ends of the valve core 3 is no longer balanced. Under the action of hydraulic pressure, the valve core 3 moves axially until the pressure of the sensitive cavity 304 recovers to half of the pressure of the balance cavity 301, the force on both ends of the valve core 3 reaches a balanced state, and the position of the valve core 3 is fixed. At this time, the opening amount between the valve core 3 and the valve body 2 changes, thereby changing the output flow of the hydraulic oil.

[0022] Due to the torque amplification effect of the worm gear 101 transmission, the stepper motor 1 only needs a small rotating torque to make the turbine 201 generate a larger torque, and in turn drive the valve core 3 to rotate. This makes the 2D electromagnetic valve adopting the worm gear 101 transmission have high reliability and high stability. When it is necessary to change the output flow of the electromagnetic valve, the rotation angle of the rotating shaft of the stepper motor 1 only needs to be controlled to realize the accurate adjustment of the flow.

[0023] In actual application, the rotation angle of the worm 101 can be accurately controlled by adjusting the rotation angle of the stepper motor 1, and in turn the output flow is accurately controlled. The rotation angle of the worm 101 is at least 1.8 degrees, and the axial displacement distance of the valve core 3 is less than 0.9 mm during the overall movement of the valve core 3. Due to the reverse stroke self-locking characteristic of the worm gear 101 transmission, the electromagnetic valve can be powered off after the output flow is adjusted, and still can stably output the adjusted flow without continuous power supply. This characteristic has a significant advantage in the field of chemical industry and aerospace technology which has a very high requirement for flow control, and can effectively avoid the situation that the flow is uncontrollable due to power off, and protect the equipment from damage. The accurate control and stable output of the output flow, the high reliability and stability of the worm gear 101 transmission mechanism, the accurate flow adjustment capability and the power-off self-locking characteristic make great progress.

[0024] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0025] Furthermore, it needs to be explained that in the description of the present application, unless explicitly defined and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] The term "comprising" or any other similar word is intended to cover non-exclusive inclusion, so that the process, article or equipment / device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent to the process, article or equipment / device.

[0027] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A 2D solenoid valve employing worm gear transmission, comprising a drive unit and a valve body, characterized in that: The output end of the drive unit is provided with a worm gear, the valve core is provided in the middle of the valve body, the end of the valve core is provided with a turbine connected to the worm gear, the turbine is fan-shaped, the valve body is provided with a high pressure chamber, a low pressure chamber, a balance chamber and a sensitive chamber inside, the valve core is provided with an adjustment hole in the middle, the bottom of the valve body is provided with an oil inlet and an oil outlet communicating with the high pressure chamber, and an isolation platform is provided between the high pressure chamber, the low pressure chamber, the balance chamber and the sensitive chamber.

2. The 2D solenoid valve employing worm gear transmission according to claim 1, characterized in that: A sealing ring is provided on the side of the isolation platform, and a pressure relief port communicating with the outside is provided on the side wall of the low-pressure chamber.

3. The 2D solenoid valve employing worm gear drive according to claim 1, characterized in that: The valve core has an adjustment port at its end for adjusting the flow rate, and the sensitive cavity has an adjustment groove on its side wall that matches the adjustment port.

4. The 2D solenoid valve employing worm gear drive according to claim 1, characterized in that: The valve body has a positioning cavity at its end, and two positioning pads are provided inside the positioning cavity. A spring is provided between the two positioning pads and is wound around the outside of the valve core.

5. The 2D solenoid valve employing worm gear drive according to claim 1, characterized in that: The drive unit is a stepper motor, and the minimum rotation angle of the worm gear is 1.8 degrees.

6. The 2D solenoid valve employing worm gear transmission according to claim 1, characterized in that: The axial displacement distance of the valve core is less than 0.9 mm.

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