A pressure reducing valve

Abstract

The present invention relates to the field of hydraulic control technology, and discloses a pressure reducing valve, including a pole shoe, a magnetic isolation ring, an armature, an elastic member, and a driving component. The front end of the pole shoe has a first liquid discharge port, a second liquid discharge port, and a third liquid discharge port, the rear end of the pole shoe has a fourth liquid discharge port, the magnetic isolation ring has a fifth liquid discharge port and a sixth liquid discharge port, the fifth liquid discharge port is connected to the first liquid discharge port, the fourth liquid discharge port is connected to the second liquid discharge port, the sixth liquid discharge port is connected to the third liquid discharge port, and the armature has a seventh liquid discharge port and an eighth liquid discharge port that are connected to each other; one end of the elastic member abuts against the pole shoe, and the other end of the elastic member abuts against the armature, the elastic member can drive the armature to move in a direction away from the pole shoe, and the driving component can drive the armature to move toward the pole shoe. The pressure reducing valve using the technical solution of the present invention does not need to be provided with a valve core and a valve sleeve in a traditional proportional pressure reducing valve, which greatly reduces the volume and required installation space of the proportional pressure reducing valve, and improves the integration degree of the proportional pressure reducing valve.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic control, in particular to a pressure reducing valve. Background Art

[0002] The proportional pressure reducing valve is a component that converts input current into pressure output in proportion. It is widely used in the fields of automobiles, engineering machinery, etc. The proportional pressure reducing valve is generally composed of a proportional solenoid, a valve core and a valve sleeve. The valve core and the valve sleeve are fitted with a clearance and can slide relative to each other to form an oil inlet throttle and an oil return throttle. The length of the valve core and the valve sleeve is generally long, which greatly increases the volume of the proportional pressure reducing valve and the required installation space.

[0003] The current mainstream design direction of hydraulic components is lightweight and miniaturization. More compact hydraulic components mean that smaller installation space is required, which can make the layout design of host components more convenient. Therefore, a compact pressure reducing valve is urgently needed. Summary of the invention

[0004] The purpose of the present invention is to provide a pressure reducing valve which does not require the valve core and valve sleeve of a conventional proportional pressure reducing valve, thereby greatly reducing the volume of the proportional pressure reducing valve and the required installation space and improving the integration level of the proportional pressure reducing valve.

[0005] In order to achieve the above object, the present invention provides a pressure reducing valve, which comprises a pole shoe, a magnetic isolation ring, an armature, an elastic member and a driving component, wherein the magnetic isolation ring is connected to the rear end of the pole shoe;

[0006] The front end of the pole shoe has a first liquid discharge port, a second liquid discharge port and a third liquid discharge port, the rear end of the pole shoe has a fourth liquid discharge port, the magnetic isolation ring is arranged at the rear end of the pole shoe, the magnetic isolation ring has a fifth liquid discharge port, a sixth liquid discharge port and a through hole that passes through the front end and the rear end of the magnetic isolation ring along the axis of the magnetic isolation ring, the fifth liquid discharge port is connected with the first liquid discharge port, the fourth liquid discharge port is connected with the second liquid discharge port, the sixth liquid discharge port is connected with the third liquid discharge port, the armature has a seventh liquid discharge port and an eighth liquid discharge port that are connected with each other, and the armature is arranged opposite to the fourth liquid discharge port;

[0007] One end of the elastic member abuts against the pole shoe, and the other end of the elastic member abuts against the armature, the elastic member can drive the armature to move in a direction away from the pole shoe, and the driving component can drive the armature to move toward the pole shoe and block the fourth drain port and the sixth drain port;

[0008] The armature has a first position state and a second position state,

[0009] When the armature is in the first position, the elastic member drives the armature to move away from the pole shoe and open the fourth liquid discharge port, and the fourth liquid discharge port is connected to the sixth liquid discharge port;

[0010] When the armature is in the second position, the driving component drives the armature to move toward the pole shoe, the armature disconnects the fourth drain port and the sixth drain port, the seventh drain port is connected to the fifth drain port, and the eighth drain port is connected to the sixth drain port.

[0011] In some of the embodiments, the rear end of the pole shoe has an inclined guide surface, and the guide surface gradually tilts inward from front to back along the axial direction of the pole shoe to form a mounting portion with a gradually decreasing diameter. The magnetic isolation ring is provided with a mounting surface that is compatible with the guide surface, and the mounting surface is in contact with the guide surface.

[0012] In some of the embodiments, the pole shoe has a receiving groove, the elastic member is arranged in the receiving groove, the front end of the receiving groove is connected with the fourth liquid discharge port, the rear end of the receiving groove has a limiting groove, the diameter of the limiting groove is larger than the diameter of the receiving groove, a limiting step is formed between the limiting groove and the receiving groove, the armature is slidably inserted in the limiting groove, and when the armature is in the second position, the front end of the armature abuts against the limiting step.

[0013] In some of the embodiments, an overflow channel is provided on the armature, the seventh drain port is located at the top of the armature, and the eighth drain port is arranged at the bottom of the overflow channel; when the armature is in a first position, the eighth drain port is located above the sixth drain port; when the armature is in a second position, the seventh drain port is communicated with the overflow channel.

[0014] In some of the embodiments, a throttling groove is provided on the circumferential surface of the middle part of the armature, a stepped through hole is provided inside the magnetic isolation ring, and an annular groove is opened on the wall surface of the stepped through hole. When the armature is in the first position state, the overflow channel is formed between the annular groove and the armature, and the seventh liquid discharge port is defined between the throttling groove and the magnetic isolation ring, and the seventh liquid discharge port is communicated with the overflow channel.

[0015] In some of the embodiments, a reflux groove is provided on the outer wall of the front end of the armature, and a passage connecting the sixth drain port and the fourth drain port is formed between the reflux groove and the pole shoe, and when the armature is in the second position, the reflux groove connects the sixth drain port and the fourth drain port.

[0016] In some of the embodiments, the pressure reducing valve further includes a limit member, the armature is provided with a through hole, the limit member is inserted into the through hole of the armature, and the limit member is provided with a through hole penetrating the limit member, the limit member abuts against the elastic member, the outer diameter of the limit member is larger than the caliber of the accommodating groove, and the outer diameter of the limit member is smaller than the caliber of the limit groove.

[0017] In some of the embodiments, the driving component includes an electromagnetic coil, the electromagnetic coil is arranged around the outer periphery of the armature, and the electromagnetic coil can drive the armature to move toward the pole shoe.

[0018] In some of the embodiments, the pressure reducing valve further includes a skeleton and a magnetic ring, wherein the skeleton is coated on the outside of the armature and the outside of the pole shoe, and the magnetic ring is arranged on the outside of the rear end of the armature, and the magnetic ring is made of soft magnetic material.

[0019] In some of the embodiments, the pressure reducing valve also includes a shell made of soft magnetic material, the armature, the pole shoe, the skeleton and the magnetic ring are all arranged in the shell, and the inner wall of the shell is interference fit with the outer wall of the front end of the pole shoe.

[0020] Compared with the prior art, the pressure reducing valve of the embodiment of the present invention has the following beneficial effects:

[0021] The pressure reducing valve of the embodiment of the present invention is in the first position state, the armature is located at the rightmost side under the action of the driving component, the second drain port is communicated with the third drain port, and the first drain port is in a closed state. At this time, the pressure at the third drain port is the smallest and equal to the pressure at the second drain port. When the driving component drives the armature to move to the left, the third drain port is communicated with the first drain port, and the second drain port is in a closed state. At this time, the pressure at the third drain port will increase under the action of the first drain port. When the pressure at the third drain port increases to a certain extent, the armature moves to the right. Under the joint action of the oil pressure, the elastic member and the driving component, the armature regains balance in the new position, thereby realizing proportional control of the output pressure of the pressure reducing valve, and realizing the pressure reducing process inside the pressure reducing valve, eliminating the external valve core and valve sleeve, and having a high degree of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 is a schematic cross-sectional structural diagram of a pressure reducing valve in one embodiment of the present invention in a first position state;

[0025] Figure 2 is a schematic cross-sectional structural diagram of a pressure reducing valve in one embodiment of the present invention in a second position state;

[0026] Figure 3 is a schematic diagram of the structure of an armature in one embodiment of the present invention;

[0027] Figure 4 is a schematic structural diagram of a pole shoe at an angle in one embodiment of the present invention;

[0028] Figure 5 is a schematic structural diagram of a cross section of a pole shoe in one embodiment of the present invention;

[0029] In the figure, 100, armature, 110, reflux groove, 120, throttling groove; 200, pole shoe, 210, first drainage port, 220, second drainage port, 230, third drainage port, 240, fifth drainage port, 250, fourth drainage port, 260, sixth drainage port, 270, receiving groove, 280, magnetic isolation ring; 400, elastic member, 500, limit member; 600, housing, 700, sliding bearing, 800, magnetic conductive ring, 900, skeleton. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0031] It should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] 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. The present invention is further explained and illustrated below in conjunction with the accompanying drawings and specific embodiments of the specification. The step numbers in the embodiments of the present invention are only provided for the convenience of explanation and description, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0034] like Figures 1 to 5 As shown, a pressure reducing valve according to a preferred embodiment of the present invention comprises a pole shoe 200, a magnetic isolation ring 280, an armature 100, an elastic member 400 and a driving component, wherein the magnetic isolation ring 280 is connected to the rear end of the pole shoe 200;

[0035] The front end of the pole shoe 200 is provided with a first liquid discharge port 210, a second liquid discharge port 220 and a third liquid discharge port 230, the rear end of the pole shoe 200 is provided with a fourth liquid discharge port 250, the magnetic isolation ring 280 is arranged at the rear end of the pole shoe 200, the magnetic isolation ring 280 has a fifth liquid discharge port 240, a sixth liquid discharge port 260 and a through hole that passes through the front end and the rear end of the magnetic isolation ring 280 along the axis of the magnetic isolation ring 280, the fifth liquid discharge port 240 is connected with the first liquid discharge port 210, the fourth liquid discharge port 250 is connected with the second liquid discharge port 220, the sixth liquid discharge port 260 is connected with the third liquid discharge port 230, the armature 100 is provided with a seventh liquid discharge port and an eighth liquid discharge port that are connected with each other, and the armature 100 is arranged opposite to the fourth liquid discharge port 250;

[0036] One end of the elastic member 400 abuts against the pole shoe 200, and the other end of the elastic member 400 abuts against the armature 100. The elastic member 400 can drive the armature 100 to move in a direction away from the pole shoe 200, and the driving component can drive the armature 100 to move toward the pole shoe 200 and block the fourth drain port 250 and the sixth drain port 260.

[0037] In some embodiments, the fifth liquid discharge port 240 and the first liquid discharge port 210 are connected to each other through a straight pipe, the fourth liquid discharge port 250 and the second liquid discharge port 220 are connected to each other through a straight pipe, and the sixth liquid discharge port 260 and the third liquid discharge port 230 are connected to each other through a straight pipe, thereby facilitating the processing and manufacturing of the pole shoe 200 and the magnetic isolation ring 280, making the structure of the pole shoe 200 and the magnetic isolation ring 280 compact, simplifying the processing technology of the pole shoe 200 and the magnetic isolation ring 280, reducing the processing and manufacturing costs of the pole shoe 200 and the magnetic isolation ring 280, and the straight pipe facilitates liquid flow.

[0038] The armature 100 has a first position state and a second position state.

[0039] When the armature 100 is in the first position, the elastic member 400 drives the armature 100 to move away from the pole shoe 200 and open the fourth drain port 250, and the fourth drain port 250 is connected to the sixth drain port 260;

[0040] When the armature 100 is in the second position, the driving component drives the armature 100 to move toward the pole shoe 200, the armature 100 disconnects the fourth drain port 250 from the sixth drain port 260, the seventh drain port is connected to the fifth drain port 240, and the eighth drain port is connected to the sixth drain port 260.

[0041] When the armature 100 is in the second position, if the oil pressure continues to increase, the drive component, the oil pressure and the elastic member 400 drive the armature 100 to move, forming a dynamic balance, thereby achieving the demand for changing the output pressure.

[0042] In this embodiment, the first drain port 210 is the oil inlet port P, the second drain port 220 is the oil return port T, and the third drain port 230 is the working oil port A.

[0043] Based on the above technical solutions, such as Figure 1 As shown, in the first position, the armature 100 is located at the far right side under the action of the driving component, the return oil port T is connected to the working oil port A, and the oil inlet P is in a closed state. At this time, the pressure at the working oil port A is the smallest, which is equal to the pressure at the return oil port T. The oil flow direction is as follows Figure 1 Indicated by the arrow.

[0044] like Figure 2 As shown, when the driving component drives the armature 100 to move to the left, the working oil port A is connected to the oil inlet P, and the oil return port T is in a closed state. At this time, the pressure at the working oil port A will increase under the action of the oil inlet P, and the oil flow direction is as follows Figure 2 Indicated by the arrow.

[0045] When the pressure at the working oil port A increases to a certain level, the armature 100 moves to the right. Under the joint action of the oil pressure and the driving components, the armature 100 reaches equilibrium at the new position, thereby realizing proportional control of the output pressure of the pressure reducing valve. The pressure reducing process can be achieved inside the electromagnetic coil, eliminating the external valve core and valve sleeve, and has a high degree of integration.

[0046] In some of the embodiments, the rear end of the pole shoe 200 has an inclined guide surface, which gradually tilts inward from front to back along the axial direction of the pole shoe 200 to form a mounting portion with a gradually decreasing diameter. The magnetic isolation ring 280 is provided with a mounting surface that matches the guide surface, and the mounting surface is in contact with the guide surface. The inclined surface is used for the electromagnetic coil to generate an electromagnetic force that does not change with displacement.

[0047] In some of the embodiments, the magnetic isolation ring 280 is connected to the pole shoe 200 by welding, thereby ensuring that the connection between the magnetic isolation ring 280 and the pole shoe 200 is reliable and low in cost.

[0048] In some of the embodiments, the pole shoe 200 has a receiving groove 270, the elastic member 400 is arranged in the receiving groove 270, the front end of the receiving groove 270 is connected to the fourth liquid discharge port 250, the rear end of the receiving groove 270 has a limiting groove, the diameter of the limiting groove is larger than the diameter of the receiving groove 270, and a limiting step is formed between the limiting groove and the receiving groove 270, the armature 100 is slidably inserted in the limiting groove, and when the armature 100 is in the second position, the front end of the armature 100 abuts against the limiting step.

[0049] In some of the embodiments, the elastic member 400 is a spring with relatively small stiffness, and the spring is installed between the pole shoe 200 and the armature 100; when the electromagnetic coil loses power, the spring can restore the armature 100 to its initial position. In some of the embodiments, the pole shoe 200 has a receiving groove 270, and the spring is installed in the receiving groove 270. The receiving groove 270 is provided to facilitate the installation and positioning of the spring, and the receiving groove 270 can guide the spring when the spring is compressed. The front end of the receiving groove 270 is connected to the fourth liquid discharge port 250, and the rear end of the receiving groove 270 has a limiting groove, the diameter of the limiting groove is larger than the diameter of the receiving groove 270, and a limiting step is formed between the limiting groove and the receiving groove 270. The armature 100 is slidably inserted in the limiting groove, and the diameter of the end of the armature 100 is larger than the diameter of the slot of the receiving groove 270 and smaller than the diameter of the limiting groove, so that the armature 100 can slide in the limiting groove, and the end of the armature 100 can block the slot of the receiving groove 270 so that the second liquid discharge port 220 is disconnected from other passages.

[0050] In some embodiments, the armature 100 is provided with an overflow channel, the seventh drain port is located at the top of the armature 100, when the armature 100 is in the second position, the seventh drain port is connected to the overflow channel, and the eighth drain port is provided at the bottom of the overflow channel, when the armature 100 is in the first position, the eighth drain port is located above the sixth drain port 260. Since the overflow channel is provided, the first drain port 210 and the third drain port 230 are connected, and further, since the eighth drain port is located above the sixth drain port 260, the connection route is further shortened, and the first drain port 210 and the third drain port 230 are connected.

[0051] In some of the embodiments, a throttling groove 120 is provided on the peripheral surface of the middle part of the armature 100, a stepped through hole is provided inside the magnetic isolation ring 280, and an annular groove is opened on the wall surface of the stepped through hole. When the armature 100 is in the first position, an overflow channel is formed between the annular groove and the armature 100, and a seventh liquid discharge port is defined between the throttling groove 120 and the magnetic isolation ring 280, and the seventh liquid discharge port is connected to the overflow channel.

[0052] In some of the embodiments, the armature 100 is made of soft magnetic material, and the armature 100 has a stepped shaft structure; a throttling groove 120 is provided on the circumferential surface of the stepped shaft of the armature 100, and the number of the throttling grooves 120 is four, and the four throttling grooves 120 are evenly distributed along the outer circumferential surface of the armature 100; an oil inlet channel is formed between the throttling groove 120 and the inner wall of the annular groove of the magnetic isolation ring 280, and a seventh liquid discharge port is formed between the side wall of the magnetic isolation ring 280 and the armature 100; a through hole is provided inside the armature 100, and the through hole is used for passing oil.

[0053] In some embodiments, a reflux groove 110 is provided on the outer wall of the front end of the armature 100, and a passage connecting the sixth drain port 260 and the fourth drain port 250 is formed between the reflux groove 110 and the pole shoe 200. When the armature 100 is in the second position, the reflux groove 110 connects the sixth drain port 260 and the fourth drain port 250.

[0054] In some of the embodiments, a reflux groove 110 is provided on the outer circumferential surface of the front end of the armature 100, and the number of the reflux grooves 110 is four, and the four reflux grooves 110 are evenly distributed on the circumferential surface of the armature 100; a return oil channel is formed between the reflux groove 110 and the magnetic isolation ring 280, and when the armature 100 is in the second position, the return oil channel connects the sixth drain port 260 and the fourth drain port 250.

[0055] When the armature 100 is in the first position, an overflow channel is formed between the outer wall of the armature 100 and the annular groove of the pole shoe 200. In some embodiments, the pressure reducing valve further includes a stopper 500, the armature 100 is provided with a through hole, the stopper 500 is inserted into the through hole of the armature 100, and the stopper 500 is provided with a through hole penetrating the stopper 500, the stopper 500 abuts against the elastic member 400, and the outer diameter of the stopper 500 is smaller than the diameter of the stopper groove. The stopper 500 is used to limit the minimum distance between the pole shoe 200 and the armature 100 to avoid the generation of a large electromagnetic force.

[0056] In some of the embodiments, a through hole is opened inside the armature 100, and the through hole and the limit member 500 are interference fit to achieve the installation and positioning of the limit member 500. Through holes are provided on both the limit member 500 and the armature 100, and the through holes are used to communicate the oil circuit to avoid oil being trapped at the end of the armature 100. In some of the embodiments, the limit member 500 and the armature 100 are welded to ensure that the limit member 500 and the armature 100 are reliably connected, simplifying the connection process between the limit member 500 and the armature 100 and reducing costs.

[0057] In some of the embodiments, the limit member 500 is made of non-magnetic material; the limit member 500 is a stepped shaft structure, and the smaller diameter end of the stepped shaft is interference fit with the internal through hole of the armature 100; a through hole is processed inside the limit member 500, and the through hole is used for oil flow; the limit member 500 is used to limit the relative position of the pole shoe 200 and the magnetic isolation valve core.

[0058] In some embodiments, the driving component includes an electromagnetic coil, which is arranged around the outer periphery of the armature 100, and the electromagnetic coil can drive the armature 100 to move toward the pole shoe 200. The electromagnetic coil and the armature 100 constitute an electromagnet, and in some embodiments, the electromagnetic coil is wound by enameled wire, and the electromagnetic coil is wound into a solenoid structure, and the electromagnetic coil is used to generate an excitation magnetic field.

[0059] In some of the embodiments, the pressure reducing valve also includes a skeleton 900 and a magnetic ring 800. The skeleton 900 is covered on the outside of the armature 100 and the outside of the pole shoe 200. The magnetic ring 800 is arranged on the outside of the rear end of the armature 100. The magnetic ring 800 is made of soft magnetic material. The magnetic ring 800 is a cylindrical structure. A through hole is opened inside the magnetic ring 800. The magnetic ring 800 is used for communicating the magnetic circuit.

[0060] In some of the embodiments, the pressure reducing valve further comprises a housing 600, which is made of a soft magnetic material and is a cylindrical structure. A stepped through hole is provided inside the housing 600; the stepped through hole is used to install the internal structural parts of the proportional pressure reducing valve such as the armature 100, the pole shoe 200, the frame 900 and the magnetic conductive ring 800. The housing 600 is connected to the wall surface of the pole shoe 200 near the front end by interference fit, thereby realizing the positioning and installation of the pole shoe 200 and the housing 600, and the outer surface of the magnetic conductive ring 800 is in contact with the inner surface of the housing 600. One of the functions of the housing 600 is to install the electromagnet assembly; the second function of the housing 600 is to conduct magnetism.

[0061] In some of the embodiments, the first drain port 210, the second drain port 220 and the third drain port 230 are all cylindrical stepped hole countersunk holes arranged on the front end surface of the pole shoe 200, so as to facilitate the processing of the first drain port 210, the second drain port 220 and the third drain port 230, and the countersunk holes are convenient for ensuring the accuracy when connecting with other components, and at the same time can protect the first drain port 210, the second drain port 220, and the third drain port 230.

[0062] In some embodiments, the pole shoe 200 and the armature 100 are both made of soft magnetic materials. In some embodiments, the rear end surface of the pole shoe 200 is processed with an inclined surface with a certain angle, and the inclined surface is used for the electromagnetic coil to generate an electromagnetic force that does not change with displacement.

[0063] In some of the embodiments, the rear end of the armature 100 is sleeved with a sliding bearing 700, which is made of a soft magnetic material as a base; the sliding bearing 700 is clearance-matched with the outer peripheral surface of the rear end of the armature 100, thereby facilitating the sliding of the armature 100; in some of the embodiments, the surface of the sliding bearing 700 is coated with a friction-reducing material, which is used to reduce the friction between the surface of the armature 100 and the surface of the armature 100.

[0064] The working process of the present invention is:

[0065] like Figure 1 As shown in the figure, when the power is off, the armature is located at the far right side under the action of the spring, the oil return port T is connected to the working oil port A, and the oil inlet port P is in a closed state. At this time, the pressure at the working oil port A is the smallest, which is equal to the pressure at the oil return port T. The oil flow direction is as follows Figure 1 Indicated by the arrow.

[0066] like Figure 2 As shown in the figure, when the power is turned on, the armature moves to the left under the action of the electromagnetic force to overcome the elastic force of the return spring, the working oil port A is connected to the oil inlet P, and the return oil port T is in a closed state. At this time, the pressure of the working oil port A will increase due to the action of the oil inlet P. The oil flow direction is as follows Figure 2As shown by the arrow in the middle. When the pressure at the working oil port A increases to a certain level, the armature moves to the right, and the elastic force of the spring, the electromagnetic force, and the feedback fluid pressure at the working oil port A are balanced again at the new position, and the working oil port A, the return oil port T, and the oil inlet P are all cut off from each other. As the input current continues to increase, the pressure at the working oil port A increases proportionally. Through the above process, the proportional control of the output pressure of the pressure reducing valve is achieved.

[0067] At this time, the armature is in a force balance state, and its force balance equation is:

[0068]

[0069] In the formula, F s is the elastic force of the return spring; F e is the electromagnetic force generated by the proportional solenoid; p A is the pressure at the working oil port A; D is the diameter of the large diameter surface of the armature; d is the diameter of the small diameter end surface of the armature.

[0070] The electromagnetic force F generated by the proportional solenoid e The approximate relationship with the input current i is:

[0071] F e =k*i (2)

[0072] In the formula, k is the proportional coefficient of the proportional electromagnet, which is a positive value; i is the current input to the proportional electromagnet.

[0073] Spring force F s for:

[0074] F s =k s *Δx2 (3)

[0075] In the formula, k s is the spring stiffness of the spring; Δx2 is the compression of the spring.

[0076] So the pressure at the working oil port A is:

[0077]

[0078] Since the armature structure is fixed, the large diameter end face diameter D and the small diameter end face diameter d of the armature are constant. s is very small, so the spring force of the spring can be approximated to be a constant value. Therefore, as the proportional solenoid input current i continues to increase, the pressure p at the working oil port A A Increase proportionally.

[0079] In summary, an embodiment of the present invention provides a pressure reducing valve, wherein the pressure reducing valve is in a first position state, the armature is located at the rightmost side under the action of a driving component, the second drain port is communicated with the third drain port, and the first drain port is in a closed state. At this time, the pressure at the third drain port is the smallest, and the pressure at the third drain port is equal to the pressure at the second drain port. When the driving component drives the armature to move to the left, the third drain port is communicated with the first drain port, and the second drain port is in a closed state. At this time, the pressure at the third drain port will increase under the action of the first drain port. When the pressure at the third drain port increases to a certain extent, the armature moves to the right. Under the joint action of oil pressure, elastic force and driving component, the armature regains balance in the new position, thereby realizing proportional control of the output pressure of the pressure reducing valve, and the pressure reducing process can be realized inside the electromagnetic coil, eliminating the external valve core and valve sleeve, and having a high degree of integration.

[0080] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", "X-axis direction", "Y-axis direction", "Z-axis direction" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Moreover, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to express other meanings. For example, the term "upper" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0081] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0082] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0083] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A pressure reducing valve, characterized in that: It includes a pole shoe, a magnetic isolation ring, an armature, an elastic member and a driving component, wherein the magnetic isolation ring is connected to the rear end of the pole shoe; The front end of the pole shoe has a first liquid discharge port, a second liquid discharge port and a third liquid discharge port, the rear end of the pole shoe has a fourth liquid discharge port, the magnetic isolation ring has a fifth liquid discharge port, a sixth liquid discharge port and a through hole that passes through the front end and the rear end of the magnetic isolation ring along the axis of the magnetic isolation ring, the fifth liquid discharge port is connected with the first liquid discharge port, the fourth liquid discharge port is connected with the second liquid discharge port, the sixth liquid discharge port is connected with the third liquid discharge port, the armature has a seventh liquid discharge port and an eighth liquid discharge port that are connected with each other, and the armature is arranged opposite to the fourth liquid discharge port; One end of the elastic member abuts against the pole shoe, and the other end of the elastic member abuts against the armature, the elastic member can drive the armature to move in a direction away from the pole shoe, and the driving component can drive the armature to move toward the pole shoe and block the fourth drain port and the sixth drain port; The armature has a first position state and a second position state. When the armature is in the first position state, the elastic member drives the armature to move away from the pole shoe and open the fourth liquid discharge port, and the fourth liquid discharge port is connected to the sixth liquid discharge port. When the armature is in the second position, the driving component drives the armature to move toward the pole shoe, the armature disconnects the fourth drain port and the sixth drain port, the seventh drain port is connected to the fifth drain port, and the eighth drain port is connected to the sixth drain port; The rear end of the pole shoe is provided with an inclined guide surface, and the guide surface is gradually inclined inward from front to back along the axis direction of the pole shoe to form a mounting portion with a gradually reduced diameter, and the magnetic isolation ring is provided with a mounting surface adapted to the guide surface, and the mounting surface is in contact with the guide surface; The pole shoe has a receiving groove, the elastic member is arranged in the receiving groove, the front end of the receiving groove is connected with the fourth liquid discharge port, the rear end of the receiving groove has a limiting groove, the diameter of the limiting groove is larger than the diameter of the receiving groove, a limiting step is formed between the limiting groove and the receiving groove, the armature is slidably inserted in the limiting groove, and when the armature is in the second position state, the front end of the armature abuts against the limiting step; The armature is provided with an overflow channel, the seventh drain port is located at the top of the armature, and the eighth drain port is arranged at the bottom of the overflow channel. When the armature is in a first position, the eighth drain port is located above the sixth drain port. When the armature is in a second position, the seventh drain port is communicated with the overflow channel.

2. The pressure reducing valve according to claim 1, characterized in that: A throttling groove is provided on the peripheral surface of the middle part of the armature, a stepped through hole is provided inside the magnetic isolation ring, and an annular groove is opened on the wall surface of the stepped through hole. When the armature is in the first position state, the overflow channel is formed between the annular groove and the armature, and the seventh liquid discharge port is defined between the throttling groove and the magnetic isolation ring, and the seventh liquid discharge port is communicated with the overflow channel.

3. The pressure reducing valve according to claim 1, characterized in that: A reflux groove is provided on the outer wall of the front end of the armature, and a passage connecting the sixth drain port and the fourth drain port is formed between the reflux groove and the pole shoe. When the armature is in the second position, the reflux groove connects the sixth drain port and the fourth drain port.

4. The pressure reducing valve according to claim 2, characterized in that: It also includes a limiting member, the armature is provided with a through hole, the limiting member is inserted into the through hole of the armature, and the limiting member is provided with a through hole that penetrates the limiting member, the limiting member abuts against the elastic member, the outer diameter of the limiting member is larger than the caliber of the accommodating groove, and the outer diameter of the limiting member is smaller than the caliber of the limiting groove.

5. The pressure reducing valve according to claim 1, characterized in that: The driving component comprises an electromagnetic coil, the electromagnetic coil ring is arranged on the outer periphery of the armature, and the electromagnetic coil can drive the armature to move toward the pole shoe.

6. The pressure reducing valve according to claim 1, characterized in that: It also includes a frame and a magnetic conductive ring. The frame is covered on the outside of the armature and the outside of the pole shoe. The magnetic conductive ring is arranged on the outside of the rear end of the armature and is made of soft magnetic material.

7. The pressure reducing valve according to claim 6, characterized in that: It also includes a shell made of soft magnetic material, the armature, the pole shoe, the frame and the magnetic conductive ring are arranged in the shell, and the inner wall of the shell is interference fit with the outer wall of the front end of the pole shoe.

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