Anti-falling electromagnetic proportional pressure valve

Abstract

The utility model provides an anti-falling electromagnetic proportional pressure valve, and belongs to the technical field of electromagnetic valves. According to the utility model, the screw sleeve is sleeved outside the static iron core, the outer side wall of the static iron core is provided with the telescopic limiting piece, the inner side wall of the screw sleeve is provided with the limiting groove comprising the first limiting section and the second limiting section with the same cross section size, and the telescopic head of the telescopic limiting piece extends into the limiting groove. The problem of irregular deformation or damage caused by accidental extrusion of the sealing ring under the non-installation condition is prevented through cooperation of the limiting groove and the telescopic limiting piece, axial movement of the screw sleeve relative to the static iron core can be achieved by extruding and retracting the telescopic head located in the first limiting section, the installation requirement is met, and the installation efficiency is improved. And when the telescopic head moves into the second limiting section, the telescopic head cannot retract any more, so that the screw sleeve is limited to continue to move through the telescopic head, the static iron core is prevented from reversely disengaging from the interior of the screw sleeve, and the stability of the electromagnetic proportional pressure valve after installation is improved.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, specifically to an anti-disengagement electromagnetic proportional pressure valve. Background Technology

[0002] There is a type of pressure control valve on the market, such as the oil rail pressure sealing structure and control valve disclosed in patent CN222526912U. One end of the stationary iron core is provided with a valve seat, and a flow channel is provided inside the valve seat. The push rod is slidably set in the stationary iron core and one end extends into the flow channel. A sealing ring is provided on the outer side of the lower end of the stationary iron core. The push rod is coaxially inserted into the stationary iron core. The upper end of the stationary iron core is provided with a top groove and a coil groove provided on the lower side of the top groove. A coil is provided in the coil groove. The flange body and the moving iron core are located in the top groove. The top end of the push rod is connected and fixed to the moving iron core. At the same time, a linear moving cavity matching the moving iron core is provided at the bottom of the flange body. A spring is sleeved on the top end of the push rod, with its upper end abutting against the bottom side of the flange body and its lower end abutting against the upper side of the moving iron core. A sealing ring is provided between the flange body and the groove wall of the top groove. In addition, a coil is installed in the stationary iron core. When the coil is energized, it can drive the moving iron core to move the push rod, thereby changing the positional relationship between the push rod and the flow channel. This enables the opening and closing control of the flow channel and the adjustment of the opening size of the flow channel, thus meeting the oil pressure regulation requirements.

[0003] Although the pressure control valve with the above structure can meet the oil pressure regulation requirements, its installation structure consists of a threaded sleeve fitted around the stationary iron core. A first sealing groove is formed on the outer wall of the stationary iron core, and a second sealing groove is formed on the inner wall of the hole at one end of the sleeve. A sealing ring is fitted into the first and second sealing grooves on both sides respectively. After the pressure control valve is inserted into the mounting hole, the valve seat abuts against the step in the base. By tightening the sleeve, the screw sleeve is reliably installed in the mounting hole through the threaded connection in the mounting hole. The sleeve presses the stationary iron core in place through the sealing ring, which can both achieve a seal and prevent the stationary iron core from coming out in the opposite direction. Because the sealing ring is susceptible to deformation, it may come out of the first sealing groove under strong external force, causing the pressure control valve to fall off and resulting in poor installation stability. In addition, before installation, the screw sleeve is movably fitted outside the stationary iron core, which may cause irregular pressure on the sealing ring during transportation, resulting in irregular deformation or damage to the sealing ring before installation, affecting the sealing performance after installation. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention aims to provide an anti-detachment electromagnetic proportional pressure valve. This valve incorporates a telescopic limiting element within the stationary iron core and a limiting groove on the inner wall of the screw sleeve. The opening of the limiting groove communicates with the sleeve hole of the screw sleeve, allowing the telescopic limiting element to extend into the limiting groove. Furthermore, the limiting element restricts the movement of the screw sleeve relative to the stationary iron core when not installed, preventing the screw sleeve from accidentally compressing the sealing ring and causing irregular deformation or damage. Simultaneously, after installation, the valve mutually limits the movement of the screw sleeve, preventing the stationary iron core from detaching from the screw sleeve in the opposite direction, thus improving installation stability.

[0005] The specific technical solution is as follows:

[0006] An anti-detachment electromagnetic proportional pressure valve includes a stationary iron core, a screw sleeve, and a sealing ring. The screw sleeve is sleeved outside the stationary iron core. A first sealing groove is formed on the outer wall of the stationary iron core. A second sealing groove is formed on the inner wall of the hole at one end of the screw sleeve. A sealing ring is provided in the first sealing groove. When the screw sleeve moves, the other side of the sealing ring is embedded into the first sealing groove. The valve also includes a telescopic limiting member and a limiting groove. The telescopic limiting member is provided on the outer wall of the stationary iron core and arranged radially thereon. A limiting groove is formed on the inner wall of the screw sleeve at the end near the second sealing groove, and the opening of the limiting groove communicates with the hole of the screw sleeve.

[0007] Furthermore, the limiting groove includes a first limiting section and a second limiting section. The first limiting section and the second limiting section are connected and distributed along the axial direction of the stationary iron core. The first limiting section is arranged close to the second sealing groove and its cross-section is larger than that of the second limiting section. The telescopic head of the telescopic limiting member extends into the first limiting section or the second limiting section. When the telescopic head is located in the second limiting section, the telescopic head retracts to its maximum position.

[0008] In the aforementioned anti-detachment electromagnetic proportional pressure valve, a mounting hole is also provided on the outer wall of the end of the screw sleeve near the end where the second sealing groove is opened. The mounting hole is connected to the first limiting section, and in the initial state, the mounting hole is aligned with the installation position of the telescopic limiting member on the stationary iron core.

[0009] In the aforementioned anti-disengagement electromagnetic proportional pressure valve, a plug is provided in the mounting hole, a protrusion is provided on the outer wall of the plug, and a recess is provided on the inner wall of the mounting hole. When the plug is located in the mounting hole, the protrusion is engaged into the recess.

[0010] In the aforementioned anti-detachment electromagnetic proportional pressure valve, a temporary limiting hole is also provided on the bottom of the groove of the first limiting section, and the telescopic head of the telescopic limiting component selectively engages in the temporary limiting hole.

[0011] In the aforementioned anti-detachment electromagnetic proportional pressure valve, a guide slope is provided between the first and second limiting sections of the limiting groove.

[0012] In the aforementioned anti-detachment electromagnetic proportional pressure valve, the telescopic limiting component further includes a pressure spring. A telescopic hole is provided on the outer wall of the stationary iron core. One end of the telescopic head is slidably disposed in the telescopic hole, and the other end of the telescopic head extends into the limiting groove. The pressure spring is disposed in the telescopic hole, and its two ends abut against the end of the telescopic head located in the telescopic hole and the bottom of the telescopic hole, respectively.

[0013] In the aforementioned anti-disengagement electromagnetic proportional pressure valve, the telescopic orifice is a stepped orifice, and the telescopic head has a variable cross-section structure. The telescopic orifice includes a large inner diameter orifice and a small inner diameter orifice, which are coaxially arranged and interconnected. The large inner diameter orifice is located on the side near the limiting groove, and the connection between the large inner diameter orifice and the small inner diameter orifice forms a first limiting step. The telescopic head includes a large end and a small end. One end of the large end slides in the large inner diameter orifice, and the other end extends into the limiting groove. One end of the small end slides in the small inner diameter orifice, and the other end extends into the large inner diameter orifice and connects with the large end.

[0014] In the aforementioned anti-detachment electromagnetic proportional pressure valve, the outer edge of the end of the telescopic head that extends into the limiting groove is chamfered.

[0015] The positive effects of the above technical solution are:

[0016] The aforementioned anti-detachment electromagnetic proportional pressure valve features a telescopic limiting member radially positioned on the outer wall of the stationary iron core fitted with a screw sleeve. Simultaneously, a limiting groove with a first limiting section and a second limiting section of different cross-sections is formed on the inner wall of the screw sleeve. The telescopic head of the telescopic limiting member extends into the limiting groove. Initially, the telescopic head is located in the first limiting section with the larger cross-section. At this point, the telescopic head temporarily restricts the screw sleeve, allowing it to move away from the sealing ring during transport or before installation. This prevents the screw sleeve from accidentally squeezing the sealing ring, causing irregular deformation or damage, and ensures the sealing performance of the sealing ring during subsequent installation. After installation, the telescopic head enters the second limiting section, where it can no longer retract, achieving stable and reliable limiting of the screw sleeve. This prevents the stationary iron core from detaching from the screw sleeve and improves the stability of the electromagnetic proportional pressure valve after installation. Attached Figure Description

[0017] Figure 1 This is a structural diagram of an embodiment of the anti-detachment electromagnetic proportional pressure valve of this utility model;

[0018] Figure 2 for Figure 1 Enlarged view of section A;

[0019] Figure 3 This is a structural diagram of the telescopic limiting member of a preferred embodiment of the present invention when it is just installed;

[0020] Figure 4 This is a structural diagram of a preferred embodiment of the present invention when the telescopic head is located between the first limiting segment and the second limiting segment;

[0021] Figure 5 A structural diagram of a preferred embodiment of the present invention showing the telescopic head located within the second limiting segment.

[0022] In the attached diagram: 1. Stationary iron core; 11. First sealing groove; 12. Telescopic hole; 13. Coil assembly; 121. First limiting step; 2. Screw sleeve; 21. Second sealing groove; 22. Limiting groove; 23. Mounting hole; 24. Plug; 221. First limiting section; 222. Second limiting section; 223. Guide slope; 231. Concave hole; 241. Protrusion; 2211. Temporary limiting hole; 3. Sealing ring; 4. Telescopic limiting component; 41. Telescopic head; 42. Compression spring; 411. Second limiting step; 412. Chamfer; 5. Valve seat; 6. Moving iron core; 61. Push rod; 62. Push ball; 7. Return spring; 8. Pressure cap; 9. Outer cover with Pin assembly. Detailed Implementation

[0023] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 5 The technical solution provided by this utility model is described in detail, but the following content is not intended to limit this utility model.

[0024] Figure 1 This is a structural diagram of an embodiment of the anti-detachment electromagnetic proportional pressure valve of this utility model; Figure 2 for Figure 1 An enlarged view of section A. (See image below.) Figure 1 and Figure 2As shown, the anti-detachment electromagnetic proportional pressure valve provided in this embodiment includes: a stationary iron core 1, a screw sleeve 2, a sealing ring 3, a telescopic limiting member 4, and a limiting groove 22. At this time, the screw sleeve 2 is fitted over the stationary iron core 1, allowing the screw sleeve 2 to move axially along the stationary iron core 1, providing conditions for subsequently compressing the sealing ring 3 and preventing the stationary iron core 1 from detaching from the screw sleeve 2. Simultaneously, a first sealing groove 11 is formed on the outer wall of the stationary iron core 1, and a second sealing groove 21 is formed on the inner wall of the opening at one end of the screw sleeve 2. The sealing ring 3 is disposed within the first sealing groove 11. Furthermore, as the screw sleeve 2 moves, the other side of the sealing ring 3 is embedded into the first sealing groove 11. That is, when the electromagnetic proportional valve is installed on the corresponding carrier through the screw sleeve 2, by turning the screw sleeve 2, the screw sleeve 2 moves toward one side of the sealing ring 3, so that the second sealing groove 21 can correspond to the sealing ring 3, thereby causing one side of the sealing ring 3 to be squeezed into the second sealing groove 21. As the screw sleeve 2 continues to move, the relative movement of the second sealing groove 21 and the first sealing groove 11 compresses the sealing ring 3, so that the sealing ring 3, after being compressed and deformed, fills the assembly gap between the screw sleeve 2, the stationary iron core 1 and the corresponding carrier, ensuring the sealing performance. At the same time, the compressed and deformed sealing ring 3 can also act on the first sealing groove 11, thereby pressing down the stationary iron core 1 and preventing the stationary iron core 1 from coming out of the screw sleeve 2 in the opposite direction, thus improving the stability of the electromagnetic proportional pressure valve after installation. It is worth noting that the anti-disengagement electromagnetic proportional pressure valve in this embodiment also includes a valve seat 5, a push rod 61, a push ball 62, a moving iron core 6, a return spring 7, a pressure cap 8, and an outer cover 9 with a pin assembly. In this case, the valve seat 5 is installed at one end of the stationary iron core 1, and a coil assembly 13 is embedded at the other end of the stationary iron core 1. The end of the stationary iron core 1 with the coil assembly 13 is provided with a mounting cavity, and the moving iron core 6 is provided in the mounting cavity. At the same time, a pressure cap 8 is provided on the side of the mounting cavity away from the coil assembly 13, and an outer cover with a pin assembly is installed on the outside of the pressure cap 8. The pin assembly is electrically connected to the coil assembly 13. Meanwhile, a sliding hole extending to the valve seat 5 is opened on the stationary iron core 1, and the push rod 61 passes through the sliding hole. One end of the rod extends to the valve seat 5, and the other end is connected to the moving iron core 6. At the same time, a return spring 7 is provided between the moving iron core 6 and the pressure cover 8. Furthermore, a flow channel with a throttling surface is provided inside the valve seat 5. One end of the push rod 61 extends into the flow channel and extends to the throttling surface. At the same time, a top ball 62 is provided between the throttling surface and the push rod 61. Since the structure of the existing electromagnetic proportional pressure valve on the market is the same as or similar to the structure and installation method of the valve seat 5, push rod 61, top ball 62, moving iron core 6, return spring 7, pressure cover 8 and outer cover 9 with Pin component disclosed in this embodiment, the specific structure of the valve seat 5, push rod 61, top ball 62, moving iron core 6, return spring 7, pressure cover 8 and outer cover 9 with Pin component will not be described in detail here.

[0025] Specifically, the telescopic limiting member 4 is disposed on the outer wall of the stationary iron core 1 and arranged radially thereafter, so that the telescopic limiting member 4 can extend and retract radially along the stationary iron core 1, thereby meeting the restriction requirements of the screw sleeve 2 at different time periods. In addition, a limiting groove 22 is provided on the inner wall of the screw sleeve 2, at one end near the second sealing groove 21, which is recessed into the inner wall. The limiting groove 22 provides the conditions for the telescopic limiting member 4 on the stationary iron core 1 to act on the screw sleeve 2. Furthermore, the opening of the limiting groove 22 communicates with the sleeve hole of the screw sleeve 2, so that the telescopic head 41 of the telescopic limiting member 4 on the stationary iron core 1 can smoothly extend into the sleeve hole on the screw sleeve 2, meeting the usage requirements of mutual cooperation between the stationary iron core 1 and the screw sleeve 2.

[0026] Figure 3 This is a structural diagram of the telescopic limiting member of a preferred embodiment of the present invention when it is just installed; Figure 4 This is a structural diagram of a preferred embodiment of the present invention when the telescopic head is located between the first limiting segment and the second limiting segment; Figure 5 A structural diagram of a preferred embodiment of this utility model showing the telescopic head located within the second limiting segment. (See diagram for reference.) Figures 1 to 5As shown, the limiting groove 22 on the screw sleeve 2 includes a first limiting segment 221 and a second limiting segment 222. The cross-sections of the first limiting segment 221 and the second limiting segment 222 are different, providing conditions for the screw sleeve 2 to be in different positions on the stationary iron core 1 at different time periods. At this time, the first limiting segment 221 and the second limiting segment 222 are connected and distributed along the axial direction of the stationary iron core 1, so that one end of the first limiting segment 221 is connected to one end of the second limiting segment 222. This provides conditions for the telescopic head 41 of the telescopic limiting member 4 to subsequently enter from the first limiting segment 221 into the second limiting segment 222 or from the second limiting segment 222 into the first limiting segment 221. In addition, the first limiting section 221 is arranged close to the second sealing groove 21 and its cross-section is larger than that of the second limiting section 222. The telescopic head 41 of the telescopic limiting member 4 extends into the first limiting section 221 or the second limiting section 222, so that when the screw sleeve 2 is in the initial state, the first limiting section 221 can provide a larger clearance space. At this time, the telescopic head 41 of the telescopic limiting member 4 is located in the first limiting section 221. Since the cross-section of the first limiting section 221 is larger, the telescopic head 41 of the telescopic limiting member 4 still has telescopic space, so that the screw sleeve 2 can rotate and move along the axial direction of the stationary iron core 1 after compressing the telescopic head 41. After the screw sleeve 2 moves a predetermined distance, the telescopic head 41 of the telescopic limiting member 4 enters the second limiting section 222 from the first limiting section 221. At this time, when the telescopic head 41 is located in the second limiting section 222, the telescopic head 41 retracts to its maximum position, making it impossible for the telescopic head 41 of the telescopic limiting member 4 to retract further. This allows the telescopic head 41 of the limiting telescopic member to form a stable limiting post on the outer wall of the stationary iron core 1, restricting the screw sleeve 2 from continuing to move axially relative to the stationary iron core 1. Since the screw sleeve 2 is fixed on the corresponding carrier, it restricts the stationary iron core 1 from being pulled out of the screw sleeve 2 in the opposite direction. This means that the restriction of the screw sleeve 2 on the stationary iron core 1 is no longer only achieved by the sealing ring 3, but also by the telescopic head 41 of the telescopic limiting member 4, which has better rigidity and stability. This further improves the installation stability and reliability of the electromagnetic proportional pressure valve and provides better anti-loosening performance.

[0027] More specifically, a mounting hole 23 is also provided on the outer side wall of the end of the screw sleeve 2 near the opening of the second sealing groove 21, and the mounting hole 23 penetrates the side wall of the screw sleeve 2. At this time, the mounting hole 23 connects to the first limiting section 221, and in the initial state, the mounting hole 23 and the installation position of the telescopic limiting member 4 on the stationary iron core 1 are directly opposite each other. This allows the screw sleeve 2 to be first placed on the outside of the stationary iron core 1 when assembling and manufacturing the electromagnetic proportional pressure valve of this embodiment, and then the screw sleeve 2 to be rotated until the mounting hole 23 and the installation position of the telescopic limiting member 4 on the stationary iron core 1 are directly opposite each other. This allows the telescopic head 41 and other structural components of the telescopic limiting member 4 to be installed on the stationary iron core 1 through the mounting hole 23, preventing the problem of the telescopic limiting member 4 being unable to be installed due to the screw sleeve 2 blocking the installation.

[0028] More specifically, a retainer 24 is also provided inside the mounting hole 23 on the screw sleeve 2. The retainer 24 seals the mounting hole 23 to prevent the telescopic limiting member 4 from accidentally falling out after installation. Preferably, a protrusion 241 is provided on the outer wall of the retainer 24, and a recess 231 is provided on the inner wall of the mounting hole 23. When the retainer 24 is located inside the mounting hole 23, the protrusion 241 is engaged with the recess 231. This allows the mounting hole 23 to be blocked by the retainer 24 after the telescopic limiting member 4 is installed on the stationary iron core 1 through the mounting hole 23. The mutual restraint of the protrusion 241 and the recess 231 ensures the stable and reliable installation of the retainer 24 in the mounting hole 23, thereby preventing the telescopic limiting member 4 from falling out of the mounting hole 23 and providing higher safety assurance. Preferably, the protrusion 241 on the retainer 24 is formed by potting after the retainer 24 is installed in the mounting hole 23. Alternatively, the plug 24 can be pressed into the corresponding position in the mounting hole 23 by an interference fit, so that the plug 24 can be stably installed in the mounting hole 23.

[0029] More specifically, a temporary limiting hole 2211 is provided on the bottom of the first limiting section 221 of the limiting groove 22. The telescopic head 41 of the telescopic limiting member 4 selectively engages into the temporary limiting hole 2211. That is, after the telescopic limiting member 4 is installed and the plug 24 blocks the installation hole 23, the screw sleeve 2 can be rotated slightly to allow the telescopic head 41 of the telescopic limiting member 4 to engage into the temporary limiting hole 2211. This achieves temporary positioning of the screw sleeve 2 relative to the stationary iron core 1, thereby restricting the movement of the screw sleeve 2 when not installed. This allows the screw sleeve 2 to move away from the sealing ring 3, thus preventing the screw sleeve 2 from accidentally squeezing the sealing ring 3 and causing irregular deformation or damage to the sealing ring 3, ensuring the subsequent sealing performance of the sealing ring 3.

[0030] More specifically, a guide slope 223 is provided between the first limiting segment 221 and the second limiting segment 222 of the limiting groove 22. The guide slope 223 connects the first limiting segment 221 and the second limiting segment 222, and forms a smooth transition structure between them. This allows the limiting head of the subsequent telescopic limiting member 4 to move more smoothly from the first limiting segment 221 to the second limiting segment 222 or from the second limiting segment 222 to the first limiting segment 221, avoiding jamming and improving the user experience.

[0031] More specifically, the telescopic limiting member 4 used to cooperate with the limiting groove 22 includes, in addition to the telescopic head 41 mentioned above, a pressure spring 42. At this time, a telescopic hole 12 is provided on the outer wall of the stationary iron core 1, and one end of the telescopic head 41 is slidably disposed in the telescopic hole 12, while the other end of the telescopic head 41 extends into the limiting groove 22. At the same time, the pressure spring 42 is disposed in the telescopic hole 12, with both ends abutting against the end of the telescopic head 41 located in the telescopic hole 12 and the bottom of the telescopic hole 12, respectively. This allows the pressure spring 42 to always provide a thrust for the telescopic head 41 to move toward the limiting groove 22, ensuring that the telescopic head 41 can always cooperate with the limiting groove 22 to achieve the limiting of the screw sleeve 2 in each time period. It also allows the screw sleeve 2 to retract the telescopic head 41 by squeezing it, satisfying the use requirement of the telescopic head 41 moving between the first limiting section 221 and the second limiting section 222 of the limiting groove 22.

[0032] More specifically, the telescopic hole 12 on the stationary iron core 1 is a stepped hole, and the telescopic head 41 has a variable cross-section structure. At this time, the telescopic hole 12 includes a large inner diameter hole and a small inner diameter hole. The large inner diameter hole and the small inner diameter hole are arranged coaxially and are connected to each other. The large inner diameter hole is located on the side close to the limiting groove 22, so that the connection between the large inner diameter hole and the small inner diameter hole forms a first limiting step 121. The first limiting step 121 provides conditions for subsequently limiting the continued retraction of the telescopic head 41. In addition, the telescopic head 41 includes a large end and a small end. One end of the large end slides into the large inner diameter hole, and the other end extends into the limiting groove 22. One end of the small end slides into the small inner diameter hole, and the other end extends into the large inner diameter hole and connects with the large end. This allows a second limiting step 411 to be formed on the telescopic head 41 between the large end and the small end. After the large end of the telescopic head 41 enters the second limiting section 222 of the limiting groove 22, the second limiting step 411 abuts against the first limiting step 121, so that the telescopic head 41 no longer retracts. This restricts the screw sleeve 2 from continuing to move axially relative to the stationary iron core 1, thereby preventing the stationary iron core 1 from coming out of the screw sleeve 2 in the opposite direction and improving the stability and reliability of the valve after installation.

[0033] More specifically, the outer edge of the end of the telescopic head 41 of the telescopic limiting member 4 that extends into the limiting groove 22 is provided with a chamfer 412. Preferably, the chamfer 412 can be an angled corner or a rounded corner. The chamfer 412 makes the outer edge of the large end of the telescopic head 41 smoother, thereby providing guidance for the large end of the telescopic head 41 to enter from the first limiting section 221 into the second limiting section 222 or from the second limiting section 222 into the first limiting section 221. This ensures that the telescopic head 41 can switch more smoothly between the first limiting section 221 and the second limiting section 222, and the structural design is more reasonable.

[0034] The anti-detachment electromagnetic proportional pressure valve provided in this embodiment includes a stationary iron core 1, a screw sleeve 2, a sealing ring 3, a telescopic limiting member 4, and a limiting groove 22. The screw sleeve 2 is fitted over the stationary iron core 1. The telescopic limiting member 4 is provided on the outer wall of the stationary iron core 1, and the inner wall of the screw sleeve 2 is provided with a limiting groove 22 including a first limiting segment 221 and a second limiting segment 222. The telescopic head 41 of the telescopic limiting member 4 extends into the limiting groove 22. The cross-section of the first limiting segment 221 is larger than the cross-section of the second limiting segment 222. The cooperation between the limiting groove 22 and the telescopic limiting member 4 prevents detachment when not installed. The sealing ring 3 is accidentally squeezed, resulting in irregular deformation or damage. In the initial state, the telescopic head 41 is located within the first limiting section 221, allowing for retraction space. The screw sleeve 2 is axially moved relative to the stationary iron core 1 by compressing the telescopic head 41, thus meeting the installation requirements. When the screw sleeve 2 is moved further and the telescopic head 41 moves into the second limiting section 222, the telescopic head 41 can no longer retract. This restricts the screw sleeve 2 from moving further, preventing the stationary iron core 1 from coming out of the screw sleeve 2 in the opposite direction and improving the stability of the electromagnetic proportional pressure valve after installation.

[0035] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A non-detachable electromagnetic proportional pressure valve, comprising a stationary iron core, a screw sleeve, and a sealing ring, wherein the screw sleeve is sleeved around the stationary iron core, a first sealing groove is formed on the outer wall of the stationary iron core, a second sealing groove is formed on the inner wall of the orifice at one end of the screw sleeve, and a sealing ring is disposed in the first sealing groove, wherein when the screw sleeve moves, the other side of the sealing ring is embedded into the first sealing groove, characterized in that... Also includes: The telescopic limiting member and the limiting groove are provided. The telescopic limiting member is disposed on the outer side wall of the stationary iron core and arranged radially thereon. The limiting groove is provided on the inner wall of the screw sleeve and at one end near the second sealing groove. The groove opening of the limiting groove communicates with the sleeve hole of the screw sleeve. Furthermore, the limiting groove includes a first limiting section and a second limiting section, the first limiting section and the second limiting section are connected and distributed along the axial direction of the stationary iron core, the first limiting section is arranged close to the second sealing groove and its cross-section is larger than that of the second limiting section, the telescopic head of the telescopic limiting member extends into the first limiting section or the second limiting section, and when the telescopic head is located in the second limiting section, the telescopic head retracts to its maximum position.

2. The anti-disengagement electromagnetic proportional pressure valve according to claim 1, characterized in that, An installation hole is also provided on the outer side wall of the screw sleeve near the end where the second sealing groove is opened. The installation hole is connected to the first limiting section, and in the initial state, the installation hole is directly opposite the installation position of the telescopic limiting member on the stationary iron core.

3. The anti-disengagement electromagnetic proportional pressure valve according to claim 2, characterized in that, A plug is provided in the mounting hole, a protrusion is provided on the outer side wall of the plug, and a recess is provided on the inner wall of the mounting hole. When the plug is located in the mounting hole, the protrusion is engaged in the recess.

4. The anti-disengagement electromagnetic proportional pressure valve according to claim 1, characterized in that, A temporary limiting hole is also provided on the bottom of the groove of the first limiting section, and the telescopic head of the telescopic limiting member is selectively inserted into the temporary limiting hole.

5. The anti-disengagement electromagnetic proportional pressure valve according to claim 1, characterized in that, A guide slope is provided between the first limiting segment and the second limiting segment of the limiting groove.

6. The anti-disengagement electromagnetic proportional pressure valve according to claim 1, characterized in that, The telescopic limiting component also includes a pressure spring. A telescopic hole is provided on the outer wall of the stationary iron core. One end of the telescopic head is slidably disposed in the telescopic hole, and the other end of the telescopic head extends into the limiting groove. The pressure spring is disposed in the telescopic hole and its two ends abut against the end of the telescopic head located in the telescopic hole and the bottom of the telescopic hole, respectively.

7. The anti-disengagement electromagnetic proportional pressure valve according to claim 6, characterized in that, The telescopic hole is a stepped hole, and the telescopic head has a variable cross-section structure. The telescopic hole includes a large inner diameter hole and a small inner diameter hole. The large inner diameter hole and the small inner diameter hole are coaxially arranged and interconnected. The large inner diameter hole is located on the side close to the limiting groove. The connection between the large inner diameter hole and the small inner diameter hole forms a first limiting step. The telescopic head includes a large end and a small end. One end of the large end slides in the large inner diameter hole, and the other end extends into the limiting groove. One end of the small end slides in the small inner diameter hole, and the other end extends into the large inner diameter hole and connects with the large end.

8. The anti-disengagement electromagnetic proportional pressure valve according to claim 7, characterized in that, The outer edge of the end of the telescopic head that extends into the limiting groove is chamfered.

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