Electromagnetic valve with self-locking function

Abstract

An electromagnetic valve (100) with a self-locking function. comprising: a C pole (50); an armature (40), which is located at one axial end of the C pole (50); a push rod (60), which comprises a first end (61) and a second end (62) in an axial direction, the first end (61) being located in the armature (40), the armature (40) axially moving to drive the push rod (60) to axially move relative to the C pole (50), and the second end (62) axially penetrating out of the C pole (50); and a locking pin (90), which is fixedly connected to the C pole (50) in a radial direction, an end portion (91) of the locking pin (90) radially penetrating out of the C pole (50) and being configured to abut against the push rod (60), wherein the push rod (60) is provided in the outer wall thereof with a first limiting groove (63) and a second limiting groove (64), which have different axial lengths, and by means of the rotation of the push rod (60) relative to the C pole (50), the end portion (91) of the locking pin (90) is switched between engaging with the first limiting groove (63) and engaging with the second limiting groove (64).

Description

Solenoid valve with self-locking function Technical Field

[0001] The present invention relates to the field of electromagnetic technology, and in particular to a solenoid valve with a self-locking function. Background Art

[0002] When the solenoid valve is in its inoperative state, the coil is de-energized and the armature is supported by a spring, creating a distance between the C-pole and the armature. When the solenoid valve is in its operative state, the coil is energized, generating an electromagnetic force that moves the armature and brings it into contact with the C-pole. This force pushes the push rod, causing the part of the push rod to extend beyond the C-pole. When the coil is disconnected, the electromagnetic force disappears, and the spring force and reaction force on the push rod side push the armature back to its inoperative state.

[0003] However, in the solenoid valve of the related art, if the part of the push rod that needs to move is to be continuously extended from the C pole, it is necessary to continuously energize the coil to generate a continuous electromagnetic force, so that the armature pushes the push rod to move. This results in high energy consumption. In addition, if the power is suddenly cut off under unexpected circumstances, the electromagnetic force of the coil will suddenly disappear when the power is cut off, causing the push rod to be unexpectedly withdrawn, which can easily cause major safety problems.

[0004] Summary of the Invention

[0005] In order to overcome the problems existing in the related art, the present disclosure provides a solenoid valve with a self-locking function.

[0006] According to the first aspect of the embodiment of the present disclosure, the present disclosure provides a solenoid valve with a self-locking function, comprising: a C pole; an armature located at one axial end of the C pole; a push rod, axially including a first end and a second end, the first end being located inside the armature, and the second end passing through the C pole, the armature moving axially to drive the push rod to move axially relative to the C pole; and a locking pin fixedly connected to the C pole in the radial direction, the end of the locking pin radially passing through the C pole and abutting against the push rod, wherein the outer wall of the push rod is provided with a first limiting groove and a second limiting groove of different axial lengths, and the end of the locking pin is switched and engaged between the first limiting groove and the second limiting groove through the axial movement and circumferential rotation of the push rod relative to the C pole.

[0007] In some embodiments, an inner serration is provided at one axial end inside the armature; an outer serration matching the inner serration is provided at the first end of the push rod; wherein, when the end of the locking pin is located in the first limiting groove or the second limiting groove, the tooth tip of the inner serration is opposite to the tooth tip of the outer serration; when the push rod moves axially in a first direction and causes the end of the locking pin to axially disengage from the first limiting groove or the second limiting groove, the tooth bevels of the inner serration and the outer serration slide relative to each other to drive the push rod to rotate relative to the armature, and the outer serration engages with the inner serration.

[0008] In some embodiments, the notch of the first limit groove is provided with a first inclined edge, and the notch of the second limit groove is provided with a second inclined edge; wherein, when the outer serrations are engaged with the inner serrations, the end of the locking pin abuts against the first inclined edge of the first limit groove or the second inclined edge of the second limit groove; when the push rod moves axially in a second direction opposite to the first direction, the first inclined edge causes the end of the locking pin to slide into the first limit groove, or the second inclined edge causes the end of the locking pin to slide into the second limit groove.

[0009] In some embodiments, the axial length of the first limiting groove is greater than the axial length of the second limiting groove; wherein, when the end of the locking pin is located in the first limiting groove, the axial length of the second end of the push rod extending from the C pole is less than the axial length of the second end of the push rod extending from the C pole when the locking pin is located in the second limiting groove.

[0010] In some embodiments, the outer wall of the push rod is also provided with an annular shift groove, which is connected to the first limit groove and the second limit groove. After the push rod moves axially to make the end of the locking pin enter the shift groove, the push rod is rotated to switch and engage between the first limit groove and the second limit groove.

[0011] In some embodiments, a plurality of locking pins are provided, and the plurality of locking pins are arranged at equal intervals along the circumferential direction.

[0012] In some embodiments, the solenoid valve with a self-locking function also includes a spring, which is sleeved on the outer wall of the push rod, a retaining ring is provided at the first end of the push rod, and an annular groove is provided at the axial end of the C pole. The spring is axially located between the retaining ring and the annular groove, and is used to provide an elastic force to the first end of the push rod away from the axial end of the C pole.

[0013] In some embodiments, the solenoid valve with a self-locking function further includes: a sleeve, which is sleeved on the outside of the armature and the C pole; and an anti-rotation structure, which is arranged between the inner wall of the sleeve and the outer walls of the armature and the C pole, and the anti-rotation structure includes a protrusion and a groove extending axially, wherein the protrusion is located on the inner wall of the sleeve, and the groove is located on the outer wall of the armature and the C pole, or the groove is located on the inner wall of the sleeve, and the protrusion is located on the outer wall of the armature or the C pole.

[0014] In some embodiments, a sliding bearing is provided between the inner wall of the C-pole and the outer wall of the push rod, for enabling the push rod to move axially and rotate circumferentially relative to the C-pole.

[0015] In some embodiments, the solenoid valve with a self-locking function further includes: a yoke, which is sleeved on the outside of the armature; a coil, which is wound on the outside of the yoke and the armature, and the coil is energized to generate electromagnetic force to drive the armature to move in a first direction to drive the push rod; and a shell, which is sleeved on the outside of the coil.

[0016] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects: the locking pin switches and engages between the first limit groove and the second limit groove on the push rod. Since the axial lengths of the first limit groove and the second limit groove are different, the locking pin can limit the push rod at different axial positions relative to the C pole. When the solenoid valve does not need to be continuously energized, the present disclosure can keep the second end of the push rod continuously extending out of the C pole, with low energy consumption and no safety issues such as the push rod suddenly returning due to power outages. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0018] FIG1 is a schematic structural diagram of an inner sawtooth of an armature according to an exemplary embodiment;

[0019] FIG2 is a schematic diagram of a three-dimensional structure of a push rod according to an exemplary embodiment;

[0020] FIG3 is a partial enlarged schematic diagram of the push rod in FIG2 at the first limiting groove and the second limiting groove;

[0021] FIG4 is a schematic diagram of a three-dimensional structure of an armature according to an exemplary embodiment;

[0022] FIG5 is a schematic diagram of a three-dimensional structure of a C pole according to an exemplary embodiment;

[0023] FIG6 is a schematic structural diagram of a sleeve according to an exemplary embodiment;

[0024] Figures 7 to 9 are schematic diagrams of the solenoid valve with a self-locking function in the initial state;

[0025] Figures 10 to 12 are schematic diagrams of the solenoid valve with a self-locking function when the coil is powered off for the first time;

[0026] 13 to 15 are schematic diagrams of the state of the solenoid valve with a self-locking function when the coil is energized for the second time. DETAILED DESCRIPTION

[0027] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0028] In the present invention, unless otherwise specified, the axial direction A, radial direction R and circumferential direction W refer to the axial direction A, radial direction R and circumferential direction W of the solenoid valve with self-locking function respectively; the axial end refers to the upper end in Figures 7, 10 and 13, the first direction D1 refers to the upper end in Figures 7, 10 and 13, and the second direction D2 refers to the lower end in Figures 7, 10 and 13.

[0029] Furthermore, a "transmission connection" refers to the ability to transmit driving force / torque between two components. This can be achieved directly or through various transmission mechanisms or connection structures. A "torsion-resistant connection" refers to the ability to transmit torque between two components. Torque-resistant connections can be achieved through interference fits, bolted connections, and other methods.

[0030] In order to solve the above technical problems, the present disclosure provides a solenoid valve 100 with a self-locking function. As shown in Figures 7, 10 and 13, the solenoid valve 100 with a self-locking function includes at least a shell 10 and a coil 20, a yoke 30, an armature 40, a C pole 50, a push rod 60 and a spring 70 located in the shell 10.

[0031] The armature 40 and the C-pole 50 are arranged along the axial direction A and are located at one axial end of the C-pole 50. As shown in Figures 7, 10 and 13, the axial and circumferential positions of the C-pole 50 are fixed, and the armature 40 is located above the C-pole 50.

[0032] The yoke 30 is mounted on the exterior of the armature 40, and the coil 20 is wound around the exterior of the yoke 30 and armature 40. When the coil 20 is energized, it generates electromagnetic force that drives the armature 40 to move axially within the housing 10 relative to the C pole 50. The armature 40, in turn, pushes the push rod 60 to move axially. In this embodiment, the armature 40 and push rod 60 move in a first direction D1 toward the lower end shown in Figures 7, 10, and 13, and in a second direction D2 toward the upper end shown in Figures 7, 10, and 13.

[0033] Furthermore, the push rod 60 includes a first end 61 and a second end 62 along the axial direction. The first end 61 is the upper end shown in FIG. 2 , and the second end 62 is the lower end shown in FIG. 2 .

[0034] The first end 61 is located within the armature 40 but does not penetrate the armature 40, allowing the armature 40 to drive the push rod 60 to move axially. The second end 62 penetrates the C-pole 50. Because the axial position of the C-pole 50 is fixed, axial movement of the armature 40 can drive axial movement of the push rod 60 relative to the C-pole 50. The second end 62 of the push rod 60 extends out of the C-pole 50 to be in transmission connection with other structures outside the solenoid valve.

[0035] The spring 70 is sleeved on the outer wall of the push rod 60, and the first end 61 of the push rod 60 is provided with a retaining ring 611, which radially protrudes from the outer wall of the push rod 60. An annular groove 51 is provided at one axial end of the C pole 50. The spring 70 is axially located between the retaining ring 611 and the annular groove 51, and is used to provide an elastic force to the first end 61 of the push rod 60 away from the axial end of the C pole 50.

[0036] When the coil 20 is energized, it generates an electromagnetic force that drives the armature 40 and the push rod 60 in the first direction D1. At this time, the push rod 60 compresses the spring 70. When the coil 20 is de-energized, the electromagnetic force disappears, and the armature 40 and the push rod 60 lose the driving force in the first direction D1. The spring 70 releases its elastic force and pushes the armature 40 and the push rod 60 in the second direction D2.

[0037] In this embodiment, the solenoid valve 100 with a self-locking function further includes a locking pin 90. The locking pin 90 is disposed along the radial direction R and is fixedly connected to the C-pole 50. That is, the radial, axial, and circumferential positions of the locking pin 90 are all fixed. The locking pin 90 may be integrally formed with the C-pole 50 or may be detachably fixedly connected to the C-pole 50, without specific limitation herein.

[0038] Furthermore, the locking pin 90 has an end portion 91 that abuts against the push rod 60 . The end portion 91 of the locking pin 90 radially extends out of the inner wall of the C pole 50 and abuts against the outer wall of the push rod 60 .

[0039] Furthermore, the outer wall of the push rod 60 is provided with a first limiting groove 63 and a second limiting groove 64 of different axial lengths. Specifically, the first limiting groove 63 and the second limiting groove 64 are both arranged along the axial direction A. At the same time, the notches of the first limiting groove 63 and the second limiting groove 64 are both facing the first end 61 of the push rod 60, that is, above as shown in Figure 2. In addition, the notches of the first limiting groove 63 and the second limiting groove 64 are flush in the axial direction, and the first limiting groove 63 and the second limiting groove 64 extend axially toward the second end 62 of the push rod 60, so that the axial lengths of the first limiting groove 63 and the second limiting groove 64 are not equal.

[0040] Furthermore, the diameter of the push rod 60 is slightly smaller than the inner diameter of the inner hole of the C pole 50, so that the push rod 60 can rotate relative to the C pole 50. From the above content, it can be seen that the push rod 60 can move axially relative to the C pole 50. Therefore, through the axial movement and circumferential rotation of the push rod 60 relative to the C pole 50, the end 91 of the locking pin 90 is switched and engaged between the first limit groove 63 and the second limit groove 64.

[0041] Specifically, when the coil 20 is energized, the armature 40 moves in the first direction D1. The push rod 60, pushed by the armature 40, also moves in the first direction D1. At this time, the end 91 of the locking pin 90 moves relative to the notch of the first limiting groove 63 or the second limiting groove 64. Because the axial distance that the armature 40 pushes the push rod 60 in the first direction D1 is greater than the axial length of the first limiting groove 63 and the second limiting groove 64, the end 91 of the locking pin 90 can disengage from the notch of the first limiting groove 63 or the second limiting groove 64. At this time, the push rod 60 rotates again relative to the C pole 50. For example, as the push rod 60 rotates, the end 91 of the locking pin 90 changes from being aligned with the notch of the first limit groove 63 to being aligned with the notch of the second limit groove 64. At this time, the coil 20 is de-energized, and under the action of the elastic force of the spring 70, the push rod 60 moves axially in the second direction D2, and the end 91 of the locking pin 90 is stuck in the second limit groove 64, realizing self-locking of the push rod 60 at this axial position, without the need for the coil 20 to be energized to drive the armature 40 to move axially.

[0042] In this embodiment, the push rod 60 has at least two first limiting grooves 63 and two second limiting grooves 64 along the circumferential direction W, and the first limiting grooves 63 and the second limiting grooves 64 are cross-arranged on the circumferential direction W, so that when the push rod 60 rotates in one direction relative to the C pole 50, for example, always rotates in the clockwise direction, the end 91 of the locking pin 90 can alternate back and forth between the first limiting groove 63 and the second limiting groove 64.

[0043] In some embodiments, multiple locking pins 90 are provided, and the multiple locking pins 90 are arranged at equal intervals along the circumferential direction W. The equal intervals between the locking pins 90 along the circumferential direction W facilitate more balanced force application to the push rod 60 and prevent problems such as tilting of the push rod 60. In this embodiment, two locking pins 90 are provided, and the two locking pins 90 are spaced 180 degrees apart along the circumferential direction.

[0044] In this embodiment, the axial length of the first limiting groove 63 is greater than the axial length of the second limiting groove 64. Because the notches of the first limiting groove 63 and the second limiting groove 64 are flush in the axial direction A, the bottom of the first limiting groove 63 is closer to the second end 62 of the push rod 60 than the bottom of the second limiting groove 64. Therefore, when the end 91 of the push rod 60 is engaged with the second limiting groove 64, the axial length of the second end 62 of the push rod 60 extending from the C pole 50 is greater than the axial length of the second end 62 of the push rod 60 extending from the C pole 50 when the locking pin 90 is located in the first limiting groove 63. Furthermore, when the end 91 of the push rod 60 is engaged with the second limiting groove 64, the push rod 60 is in the working state.

[0045] From the above content, it can be seen that the end 91 of the locking pin 90 switches and engages between the first limiting groove 63 and the second limiting groove 64 on the push rod 60. Since the axial lengths of the first limiting groove 63 and the second limiting groove 64 are different, the locking pin 90 can limit the push rod 60 at different axial positions relative to the C pole 50. When the coil 20 does not need to be continuously energized, the present invention can keep the second end 62 of the push rod 60 continuously extending out of the C pole 50, with low energy consumption.

[0046] In addition, when the end 91 of the locking pin 90 is stuck in the first limiting groove 63 or the second limiting groove 64, the rotation of the push rod 60 relative to the C pole 50 can be limited. The push rod 60 can only rotate after it moves axially in the first direction D1 and the end 91 of the locking pin 90 is disengaged from the first limiting groove 63 or the second limiting groove 64, thereby realizing the change of the axial position of the push rod 60. Therefore, the present disclosure will not cause the safety problem of the push rod 60 suddenly moving back in the second direction D2 due to power failure of the coil 20.

[0047] Furthermore, as shown in FIG1 , an inner axial end of the armature 40 is provided with inner serrations 41 . As shown in FIG2 , a first end 61 of the push rod 60 is provided with outer serrations 65 matching the inner serrations 41 .

[0048] When the end 91 of the locking pin 90 is located in the first limiting groove 63 or the second limiting groove 64, that is, when the coil 20 is not energized, the tooth tips of the inner serrations 41 are opposite to the tooth tips of the outer serrations 65. It should be noted that when the coil 20 is not energized, the tooth tips of the inner serrations 41 are not completely opposite to the tooth tips of the outer serrations 65, but there is a slight deviation in the circumferential direction W, so that the beveled edges of the inner serrations 41 and the outer serrations 65 are aligned. The beveled edge is the beveled edge connecting the tooth tip and the tooth groove.

[0049] When the coil 20 is energized to drive the armature 40 to push the push rod 60 to move axially in the first direction D1, the end 91 of the locking pin 90 can axially disengage from the first limiting groove 63 or the second limiting groove 64 in the axial direction A. At this time, due to the axial movement of the push rod 60, the beveled edges of the inner serrations 41 and the beveled edges of the outer serrations 65 are driven to slide relative to each other, thereby driving the push rod 60 to rotate relative to the armature 40. When the push rod 60 rotates a certain angle, the outer serrations 65 engage with the inner serrations 41.

[0050] Furthermore, as shown in Figure 2, the notch of the first limiting groove 63 is provided with a first inclined edge 631, and the notch of the second limiting groove 64 is provided with a second inclined edge 641; when the outer serrations 65 are engaged with the inner serrations 41, the end 91 of the locking pin 90 abuts against the first inclined edge 631 of the first limiting groove 63, or the end 91 of the locking pin 90 abuts against the second inclined edge 641 of the second limiting groove 64, that is, the end 91 of the locking pin 90 is not completely inserted into the first limiting groove 63 or the second limiting groove 64 at this time.

[0051] At this time, if the coil 20 is de-energized, the armature 40 loses its axial driving force on the push rod 60, and the spring 70 pushes the push rod 60 to move axially in the second direction D2, driving the first inclined edge 631 and the end 91 of the locking pin 90 to slide relative to each other, so that the end 91 of the locking pin 90 slides into the first limiting groove 63, or driving the second inclined edge 641 and the end 91 of the locking pin 90 to slide relative to each other, so that the end 91 of the locking pin 90 slides into the second limiting groove 64.

[0052] In some embodiments, as shown in Figure 2, the outer wall of the push rod 60 is also provided with an annular shift groove 66, which is connected to the notch of the first limiting groove 63 and the notch of the second limiting groove 64. The push rod 60 moves axially in the second direction D2, and the end 91 of the locking pin 90 enters the shift groove 66. Only then can the push rod 60 rotate so that the end 91 of the locking pin 90 switches and engages between the first limiting groove 63 and the second limiting groove 64.

[0053] As can be seen from Figure 2 of this embodiment, the limiting groove is a radially recessed annular groove on the outer wall of the push rod 60, so the diameters of the upper and lower halves of the push rod 60 are consistent and strong, which can prevent the push rod 60 from bending during reciprocating axial movement.

[0054] In some other embodiments, the outer wall of the push rod 60 may not have the transposition groove 66 , and the first limiting groove 63 or the second limiting groove 64 is a groove structure protruding from the outer wall of the push rod 60 , which is not specifically limited here.

[0055] Furthermore, as shown in Figures 7 to 9, the solenoid valve 100 with a self-locking function also includes a sleeve 80, which is sleeved on the outside of the armature 40 and the C pole 50; an anti-rotation structure is also provided between the inner wall of the sleeve 80 and the outer wall of the armature 40 and the outer wall of the C pole 50. As shown in Figures 4 to 6, the anti-rotation structure includes a protrusion 81 and a groove 82 extending in the axial direction, wherein the protrusion 81 is located on the inner wall of the sleeve 80, and the groove 82 is located on the outer wall of the armature 40 and the C pole 50 (as shown in this embodiment), or the groove 82 is located on the inner wall of the sleeve 80, and the protrusion 81 is located on the outer wall of the armature 40 or the C pole 50.

[0056] The sleeve 80 can better protect the armature 40 and the C pole 50 . In addition, the anti-rotation structure can fix the circumferential position of the armature 40 and the C pole 50 to achieve circumferential rotation of the push rod 60 relative to the C pole 50 and the armature 40 .

[0057] In some embodiments, when the push rod 60 moves axially or rotates relative to the C pole 50, there may be sliding friction or rolling friction between the inner wall of the C pole 50 and the outer wall of the push rod 60. In this embodiment, a sliding bearing 67 is provided between the inner wall of the C pole 50 and the outer wall of the push rod 60. The sliding bearing 67 can not only enable the push rod 60 to move axially and rotate circumferentially relative to the C pole 50, but also play a role of radial support, so that the push rod 60 is subjected to more uniform force in the radial and circumferential directions, thereby avoiding bending failure of the push rod 60.

[0058] The working process of the solenoid valve 100 will be described in detail below based on FIG. 7 to FIG. 13 .

[0059] Initial state

[0060] As shown in Figures 7 to 9, in the initial state, coil 20 is de-energized, end 91 of locking pin 90 is located within first retaining groove 63, armature 40 is axially spaced from C-pole 50 due to the elastic force of spring 70, and second end 62 of push rod 60 extends a short distance from C-pole 50 due to the elastic force of spring 70, thus putting push rod 60 in a non-operating state. At this point, the tips of outer teeth 65 at first end 61 of push rod 60 are aligned with the tips of inner teeth 41 of armature 40.

[0061] Coil 20 is energized for the first time

[0062] As shown in Figures 10 to 12, when coil 20 is energized for the first time, the armature 40 is forced to drive the push rod 60 axially in the first direction D1. The spring 70 is compressed, and the end 91 of the locking pin 90 moves toward the notch of the first limiting groove 63 until the end 91 of the locking pin 90 is located within the transposition groove 66. The force of the armature 40 driving the push rod 60 in the first direction D1 causes the beveled edges of the outer serrations 65 of the push rod 60 to slide relative to the beveled edges of the inner serrations 41 of the armature 40. Since the armature 40 cannot rotate, the push rod 60 rotates relative to the armature 40 and the C pole 50. At this point, the outer serrations 65 of the push rod 60 engage with the inner serrations 41 of the armature 40, and the lower end of the armature 40 abuts against the upper end of the C pole 50, thereby restricting the armature 40 from further axial movement in the first direction D1. The end 91 of the locking pin 90 abuts against the second inclined edge 641 of the second limiting groove 64.

[0063] Coil 20 is de-energized for the first time

[0064] As shown in Figures 13 to 15 , after the coil 20 is first de-energized, the armature 40 and push rod 60 move axially in the second direction D2 under the elastic force of the spring 70. The second inclined edge 641 of the second limiting groove 64 forces the end 91 of the locking pin 90 into the second limiting groove 64, thereby driving the push rod 60 to rotate relative to the C pole 50. At this point, the coil 20 is de-energized, the push rod 60 is self-locked, and its axial position relative to the C pole 50 is fixed. The push rod 60 is in an operating state. In addition, the tips of the outer serrations 65 of the push rod 60 are once again aligned with the tips of the inner serrations 41 of the armature 40.

[0065] Coil 20 is energized for the second time

[0066] When coil 20 is energized a second time, the armature 40 is forced to drive the push rod 60 axially in the first direction D1. The spring 70 is compressed, and the end 91 of the locking pin 90 moves toward the notch of the second limiting groove 64 until the end 91 of the locking pin 90 is located within the transposition groove 66. The force of the armature 40 driving the push rod 60 in the first direction D1 causes the beveled edges of the outer teeth 65 of the push rod 60 to slide relative to the beveled edges of the inner teeth 41 of the armature 40. At this point, the outer teeth 65 of the push rod 60 and the inner teeth 41 of the armature 40 are again engaged, and the lower end of the armature 40 is again in contact with the upper end of the C pole 50, thereby restricting the armature 40 from further axial movement in the first direction D1. The end 91 of the locking pin 90 abuts the first beveled edge 631 of the first limiting groove 63.

[0067] Coil 20 is de-energized for the second time

[0068] After the coil 20 is de-energized for the second time, the armature 40 and push rod 60 move axially in the second direction D2 under the elastic force of the spring 70. The first inclined edge 631 of the first limiting groove 63 forces the end 91 of the locking pin 90 into the first limiting groove 63, thereby driving the push rod 60 to rotate relative to the C pole 50. At this point, the coil 20 is de-energized, the length of the second end 62 of the coil 20 extending from the C pole 50 is reduced, the push rod 60 is in the non-operating state, and the entire solenoid valve 100 returns to its initial state. The tips of the outer serrations 65 of the push rod 60 are aligned with the tips of the inner serrations 41 of the armature 40.

[0069] It is understood that in this disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of related objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0070] It will be further understood that the terms "first," "second," and the like are used to describe various structures, but these structures should not be limited to these terms. These terms are merely used to distinguish structures of the same type from one another and do not indicate a particular order or degree of importance. In fact, the expressions "first," "second," and the like are fully interchangeable. For example, a first structure could also be referred to as a second structure, and similarly, a second structure could also be referred to as a first structure without departing from the scope of this disclosure.

[0071] It can be further understood that the terms "center", "longitudinal", "lateral", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation.

[0072] It is further understood that, unless otherwise specified, “connection” includes a direct connection where there are no other components between the two elements, and also includes an indirect connection where there are other elements between the two elements.

[0073] It is further understood that although operations are described in a particular order in the drawings in the embodiments of the present disclosure, this should not be construed as requiring that the operations be performed in the particular order shown or in a serial order, or that all of the operations shown be performed to obtain the desired results. In certain circumstances, multitasking and parallel processing may be advantageous.

[0074] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0075] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A solenoid valve (100) with a self-locking function, characterized in that: include: C pole (50); An armature (40) located at one axial end of the C pole (50); A push rod (60) including a first end (61) and a second end (62) in the axial direction, wherein the first end (61) is located inside the armature (40), and the second end (62) passes through the C pole (50), and the armature (40) moves axially to drive the push rod (60) to move axially relative to the C pole (50); and A locking pin (90) is fixedly connected to the C pole (50) in a radial direction, and an end (91) of the locking pin (90) radially passes through the C pole (50) and abuts against the push rod (60). The outer wall of the push rod (60) is provided with a first limiting groove (63) and a second limiting groove (64) of different axial lengths, and the end (91) of the locking pin (90) is switched and engaged between the first limiting groove (63) and the second limiting groove (64) through the axial movement and circumferential rotation of the push rod (60) relative to the C pole (50).

2. The solenoid valve (100) with self-locking function according to claim 1, characterized in that: An inner sawtooth (41) is provided at one axial end inside the armature (40); The first end (61) of the push rod (60) is provided with external saw teeth (65) matching the internal saw teeth (41); When the end (91) of the locking pin (90) is located in the first limiting groove (63) or the second limiting groove (64), the tooth tip of the inner sawtooth (41) is opposite to the tooth tip of the outer sawtooth (65); when the push rod (60) moves axially in the first direction (D1) and the end (91) of the locking pin (90) is axially disengaged from the first limiting groove (63) or the second limiting groove (64), the tooth bevels of the inner sawtooth (41) and the outer sawtooth (65) slide relative to each other to drive the push rod (60) to rotate relative to the armature (40), and the outer sawtooth (65) is meshed with the inner sawtooth (41).

3. The solenoid valve (100) with self-locking function according to claim 2, characterized in that: The notch of the first limiting groove (63) is provided with a first inclined edge (631), and the notch of the second limiting groove (64) is provided with a second inclined edge (641); Wherein, when the outer saw teeth (65) are meshed with the inner saw teeth (41), the end portion (91) of the locking pin (90) abuts against the first inclined edge (631) of the first limiting groove (63) or abuts against the second inclined edge (641) of the second limiting groove (64); When the push rod (60) moves axially in a second direction D2 opposite to the first direction (D1), the first inclined edge (631) causes the end (91) of the locking pin (90) to slide into the first limiting groove (63), or the second inclined edge (641) causes the end (91) of the locking pin (90) to slide into the second limiting groove (64).

4. The solenoid valve (100) with self-locking function according to claim 1, characterized in that: The axial length of the first limiting groove (63) is greater than the axial length of the second limiting groove (64); Wherein, when the end portion (91) of the locking pin (90) is located in the first limiting groove (63), the axial length of the second end (62) of the push rod (60) extending out of the C pole (50) is smaller than the axial length of the second end (62) of the push rod (60) extending out of the C pole (50) when the locking pin (90) is located in the second limiting groove (64).

5. The solenoid valve (100) with self-locking function according to claim 1, characterized in that: The outer wall of the push rod (60) is also provided with an annular shifting groove (66), and the shifting groove (66) is connected with the first limiting groove (63) and the second limiting groove (64). After the push rod (60) moves axially to make the end (91) of the locking pin (90) enter the shifting groove (66), the push rod (60) is rotated to make the end (91) of the locking pin (90) switch and engage between the first limiting groove (63) and the second limiting groove (64).

6. The solenoid valve (100) with self-locking function according to claim 1, characterized in that: A plurality of the locking pins (90) are provided, and the plurality of locking pins (90) are arranged at equal intervals along the circumferential direction.

7. The solenoid valve (100) with self-locking function according to claim 1, characterized in that: The solenoid valve (100) with a self-locking function further comprises a spring (70), wherein the spring (70) is sleeved on the outer wall of the push rod (60), a retaining ring (611) is provided at the first end (61) of the push rod (60), an annular groove (51) is provided at one axial end of the C pole (50), and the spring (70) is axially located between the retaining ring (611) and the annular groove (51) for providing an elastic force to the first end (61) of the push rod (60) away from one axial end of the C pole (50).

8. The solenoid valve (100) with self-locking function according to claim 1, characterized in that: The solenoid valve (100) with a self-locking function further comprises: A sleeve (80) is sleeved on the outside of the armature (40) and the C pole (50); and an anti-rotation structure, arranged between the inner wall of the sleeve (80) and the outer walls of the armature (40) and the C pole (50), the anti-rotation structure comprising a protrusion (81) and a groove (82) extending in the axial direction, The protrusion (81) is located on the inner wall of the sleeve (80), and the groove (82) is located on the outer wall of the armature (40) and the C pole (50), or the groove (82) is located on the inner wall of the sleeve (80), and the protrusion (81) is located on the outer wall of the armature (40) or the C pole (50).

9. The solenoid valve (100) with self-locking function according to claim 1, characterized in that: A sliding bearing 67 is provided between the inner wall of the C pole (50) and the outer wall of the push rod (60) for enabling the push rod (60) to move axially and rotate circumferentially relative to the C pole (50).

10. The solenoid valve (100) with self-locking function according to claim 1, characterized in that: The solenoid valve (100) with a self-locking function further comprises: A yoke (30) is sleeved on the outside of the armature (40); a coil (20) wound around the outside of the yoke 30 and the armature (40), wherein the coil (20) is energized to generate an electromagnetic force to drive the armature (40) to move in a first direction (D1) to drive the push rod (60); and The housing (10) is sleeved on the outside of the coil (20).

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