An electromagnetic valve having a threadless valve seat

Abstract

The utility model relates to solenoid valve technical field especially relates to a solenoid valve with screwless valve seat, include: the valve seat with valve port, set up in the inner hole of valve seat piston head, set up on the valve core subassembly of valve seat, be used for driving the coil subassembly of valve core subassembly and push piston head close valve port, the outer cylindrical surface of valve seat is the smooth surface structure, and has annular gap between the mounting hole of external pipeline, is equipped with first sealing washer on the end face of external pipeline's mounting hole far from valve port one end, is equipped with second sealing washer on the outer cylindrical surface of valve seat near valve port one end, the support of coil subassembly two sides respectively extend to form the wing plate outward, and two wing plates are fixed on external pipeline through bolt. The outer cylindrical surface of valve seat adopts smooth surface screwless design, shortens the production cycle, and reduces the cost, only needs to insert valve seat into external pipeline mounting hole during assembly, passes through bolt fixed coil support again, guarantees the stability of product quality.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valve technology, and in particular to a solenoid valve with a threadless valve seat. Background Technology

[0002] In existing solenoid valves, the valve seat, as a key component connecting the external pipeline and the valve body, is generally fixed by a screw connection structure with external threads machined on the outer cylindrical surface of the valve seat.

[0003] However, the external thread structure of traditional valve seats requires multiple processes such as rough turning, fine turning, thread rolling, thread deburring, and accuracy testing of go and no-go gauges. This not only significantly extends the production cycle but also requires investment in special thread processing equipment, leading to increased manufacturing costs. Furthermore, when assembling screw-type valve seats, the reliance on operator experience makes it impossible to properly control the tightening torque of the valve seat, directly affecting the stability of product quality.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] This invention provides a solenoid valve with a threadless valve seat, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A solenoid valve with a threadless valve seat, comprising: Valve seat, with valve port; The piston head is disposed in the inner hole of the valve seat; A valve core assembly is disposed above the valve seat, and one end of the valve needle of the valve core assembly extends into the valve seat and abuts against the end face of the piston head; A coil assembly, disposed outside the valve core assembly, is used to drive the valve needle to push the piston head to close the valve port; The outer cylindrical surface of the valve seat is smooth and has an annular gap with the mounting hole of the external pipeline. A first sealing ring is provided on the end face of the mounting hole of the external pipeline away from the valve port, and a second sealing ring is provided on the outer cylindrical surface of the valve seat near the valve port. The coil assembly has a bracket with two outwardly extending wing plates on both sides. The two wing plates are fixed to an external pipeline by bolts to prevent the valve seat from detaching from the mounting hole of the external pipeline.

[0007] Furthermore, the valve core assembly includes a stationary iron core, a moving iron core, a valve needle, and a return spring; The stationary iron core is fixed to the end of the valve seat away from the valve port, and a through hole is provided at the axial center of the stationary iron core for the valve needle to pass through. The moving iron core is slidably disposed above the stationary iron core along the axial direction. One end of the valve needle is fixed to the axial center of the moving iron core by a limiting structure, and the other end passes through the through hole of the stationary iron core along the axial direction and abuts against the end face of the piston head away from the valve port. The reset spring is sleeved on the outside of the valve needle, and its two ends abut against the moving iron core and the stationary iron core respectively. It is used to drive the moving iron core to move the valve needle away from the piston head when the coil assembly is de-energized.

[0008] Furthermore, the moving iron core has an axially oriented mounting cavity inside, and a shock-absorbing spring is provided inside the mounting cavity; The valve needle extends into the mounting cavity at one end near the moving iron core and abuts against one end of the shock-absorbing spring, while the other end of the shock-absorbing spring abuts against the bottom wall of the mounting cavity. The valve needle is elastically connected to the moving iron core via the damping spring, and can slide relative to the moving iron core along the axial direction of the mounting cavity; A plug is provided at the end of the mounting cavity.

[0009] Furthermore, a magnetic shielding sleeve is provided on the outside of the valve core assembly; One end of the magnetic shielding sleeve is an open structure, and the other end is a sealed structure.

[0010] Furthermore, the valve seat includes a guide sleeve and a valve port seat; The guide sleeve is a hollow cylindrical structure with a smooth outer cylindrical surface that forms an annular gap with the external pipeline mounting hole. The inner hole of the guide sleeve is provided with a first mounting groove and a second mounting groove at both ends. The stationary iron core of the valve core assembly is installed in the first mounting groove, and the valve seat is installed in the second mounting groove.

[0011] Furthermore, the inner diameters of both the first mounting groove and the second mounting groove are larger than the outer diameter of the piston head.

[0012] Furthermore, multiple through holes are evenly formed on the side wall of the guide sleeve along the circumferential direction, and the positions of the multiple through holes correspond to the positions of the liquid inlet holes of the external pipeline.

[0013] Furthermore, the valve seat includes, in sequence along the axial direction, a limiting shaft section and a guide shaft section; The outer peripheral surface of the limiting shaft section is interference-fitted with the inner wall of the second mounting groove of the guide sleeve. The end of the guide shaft segment away from the limiting shaft segment extends into the inner hole of the guide sleeve, and a gap is left between the outer peripheral surface of the guide shaft segment and the inner wall of the guide sleeve to form an annular cavity; The central hole of the valve seat passes through the limiting shaft section and the guide shaft section to form a valve port.

[0014] Furthermore, the outer cylindrical surface of the guide shaft segment gradually tapers towards the end away from the limiting shaft segment, forming a truncated cone-shaped inclined surface; The inclined surface corresponds to the position of the multiple through holes on the guide sleeve.

[0015] Furthermore, the axial length of the valve seat is equal to the depth of the mounting hole of the external pipeline.

[0016] The following technical effects can be achieved through the technical solution of this utility model: In this invention, the outer cylindrical surface of the valve seat adopts a smooth, threadless design, eliminating the complex process of traditional external thread processing, shortening the production cycle, and reducing costs. During assembly, the valve seat only needs to be inserted into the external pipeline mounting hole, and then the coil bracket is fixed with bolts to complete the valve seat limit, ensuring the stability of product quality.

[0017] In this invention, the valve body is directly manufactured from pipe material, which greatly reduces material costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the installation of a solenoid valve with a threadless seat. Figure 2 A schematic diagram of the isometric structure of a solenoid valve with a threadless valve seat; Figure 3 A cross-sectional view of a solenoid valve with a threadless seat; Figure 4 This is a schematic diagram showing the installation of the valve seat and piston head inside the guide sleeve.

[0020] Reference numerals in the attached drawings: 1. Valve seat; 11. Guide sleeve; 111. Through hole; 12. Valve port seat; 121. Limiting shaft section; 122. Guide shaft section; 2. Piston head; 3. Valve core assembly; 31. Stationary iron core; 32. Moving iron core; 33. Valve needle; 34. Return spring; 35. Shock-absorbing spring; 36. Plug; 4. Coil assembly; 41. Bracket; 411. Wing plate; 5. First sealing ring; 6. Second sealing ring; 7. Magnetic shielding sleeve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] like Figures 1-4 As shown, this application provides a solenoid valve with a threadless valve seat 1, including a valve seat 1, a piston head 2, a valve core assembly 3, and a coil assembly 4. The valve seat 1 has a valve port; the piston head 2 is disposed in the inner hole of the valve seat 1; the valve core assembly 3 is disposed above the valve seat 1, and one end of the valve needle 33 of the valve core assembly 3 extends into the valve seat 1 and abuts against the end face of the piston head 2; the coil assembly 4 is disposed on the outside of the valve core assembly 3 and is used to drive the valve needle 33 to push the piston head 2 to close the valve port. The valve seat 1 has a smooth outer cylindrical surface with an annular gap between it and the mounting hole of the external pipeline. A first sealing ring 5 is provided on the end face of the mounting hole of the external pipeline away from the valve port, and a second sealing ring 6 is provided on the outer cylindrical surface of the valve seat 1 near the valve port. The coil assembly 4 has a bracket 41, with two wings 411 extending outward from both sides of the bracket 41. The two wings 411 are fixed to the external pipeline by bolts. During installation, the piston head 2 and the valve core assembly 3 are installed inside the valve seat 1, and then the assembly is installed into the mounting hole of the external pipeline. One end of the annular gap is sealed by the second sealing ring 6. At this time, the first sealing ring 5 is inserted into the groove on the end face of the mounting hole, and the coil assembly 4 is sleeved on the outside of the valve core assembly 3. The two wings 411 are fixed to the end face of the external pipeline by bolts, and the other end of the annular gap is sealed by the first sealing ring 5. At the same time, the bracket 41 prevents the valve seat 1 from detaching from the mounting hole of the external pipeline.

[0024] In this invention, the outer cylindrical surface of the valve seat 1 adopts a smooth, threadless design, eliminating the complex process of traditional external thread machining, shortening the production cycle, and reducing costs. During assembly, the valve seat 1 only needs to be inserted into the external pipeline mounting hole, and then the coil bracket 41 is fixed with bolts to complete the valve seat 1's positioning, ensuring the stability of product quality. In addition, the valve seat 1 is directly manufactured from pipe material, greatly reducing material costs.

[0025] like Figure 3 As shown, the valve core assembly 3 includes a stationary iron core 31, a moving iron core 32, a valve needle 33, and a return spring 34; the stationary iron core 31 is fixed at the end of the valve seat 1 away from the valve port, and a through hole 111 for the valve needle 33 to pass through is opened at the axial center of the stationary iron core 31. The moving iron core 32 is slidably disposed above the stationary iron core 31 along the axial direction. One end of the valve needle 33 is fixed to the axial center of the moving iron core 32 by a limiting structure, and the other end passes through the through hole 111 of the stationary iron core 31 along the axial direction and abuts against the end face of the piston head 2 away from the valve port. The reset spring 34 is sleeved on the outside of the valve needle 33, and its two ends abut against the moving iron core 32 and the stationary iron core 31 respectively. It is used to drive the moving iron core 32 to move the valve needle 33 away from the piston head 2 when the coil assembly 4 is de-energized.

[0026] The moving iron core 32 and the valve needle 33 are rigidly connected by a limiting structure, and the valve needle 33 passes through the through hole 111 of the stationary iron core 31 to achieve axial guidance. This ensures that when the coil assembly 4 is energized, the magnetic drive of the moving iron core 32 can be directly and without deviation transmitted to the valve needle 33, pushing the piston head 2 to accurately close the valve port. The return spring 34 is sleeved on the outside of the valve needle 33 and its two ends abut against the moving iron core 32 and the stationary iron core 31 respectively. After the coil is de-energized, the spring force can directly drive the moving iron core 32 to drive the valve needle 33 to return to its axial position, ensuring that the piston head 2 separates from the valve port and realizes the reliable opening of the solenoid valve.

[0027] Based on the above embodiment, the moving iron core 32 has an axially oriented mounting cavity inside, and a shock-absorbing spring 35 is provided inside the mounting cavity; one end of the valve needle 33 near the moving iron core 32 extends into the mounting cavity and abuts against one end of the shock-absorbing spring 35, and the other end of the shock-absorbing spring 35 abuts against the bottom wall of the mounting cavity; the valve needle 33 is elastically connected to the moving iron core 32 through the shock-absorbing spring 35, and can slide relative to the moving iron core 32 along the axial direction of the mounting cavity.

[0028] The shock-absorbing spring 35 absorbs the impact energy between the moving iron core 32 and the valve needle 33 through elastic deformation, avoiding rigid collisions between the valve needle 33 and the piston head 2, and between the moving iron core 32 and the valve needle 33, and preventing wear and deformation of the end of the valve needle 33 due to rigid impact.

[0029] Based on the above embodiment, a plug 36 is provided at the end of the mounting cavity. The plug 36 is threadedly fitted to the inner wall of the mounting cavity, and the end face of the plug 36 abuts against the end of the damping spring 35 away from the valve needle 33, in order to prevent the damping spring 35 from dislodging from the mounting cavity.

[0030] In another preferred configuration, a magnetic shielding sleeve 7 is fitted over the outer side of the valve core assembly 3; one end of the magnetic shielding sleeve 7 is open, and the other end is sealed. The sealed-end design of the magnetic shielding sleeve 7 reduces manufacturing costs compared to the traditional combination of a cylindrical magnetic shielding sleeve 7 and a cap.

[0031] In a preferred embodiment of this utility model, the valve seat 1 includes a guide sleeve 11 and a valve seat 12; the guide sleeve 11 is a hollow cylindrical structure, its outer cylindrical surface is smooth and forms an annular gap with the external pipeline mounting hole; the two ends of the inner hole of the guide sleeve 11 are provided with a first mounting groove and a second mounting groove, the stationary iron core 31 is installed in the first mounting groove, and the valve seat 12 is installed in the second mounting groove.

[0032] During assembly, the stationary iron core 31 can be installed into the first mounting groove of the guide sleeve 11 first, and then the valve seat 12 can be installed into the second mounting groove. By adjusting the assembly depth of the valve seat 12, the slight coaxiality error of the guide sleeve 11 can be compensated to ensure the sealing alignment between the valve port and the piston head 2. The split structure design means that when the valve port diameter needs to be changed, or when the inner hole of the guide sleeve 11 is worn by the piston head 2 and needs to be replaced, only a single part needs to be replaced, without replacing the entire valve seat 1, thus reducing production costs.

[0033] Preferably, the inner diameters of the first mounting groove and the second mounting groove are both larger than the outer diameter of the piston head 2, which limits the stationary iron core 31 and the valve seat 12, making it easier to install the piston head 2.

[0034] In the preferred embodiment, multiple through holes 111 are evenly formed along the circumferential direction on the side wall of the guide sleeve 11, and the positions of the multiple through holes 111 correspond to the positions of the liquid inlet holes of the external pipeline. The multiple through holes 111 are evenly distributed along the circumference to form a multi-channel parallel liquid inlet structure, resulting in a smoother flow path.

[0035] As a preferred embodiment of the above embodiment, the valve seat 12 includes a limiting shaft section 121 and a guide shaft section 122 in sequence along the axial direction; the outer peripheral surface of the limiting shaft section 121 is interference-fitted with the inner wall of the second mounting groove of the guide sleeve 11; one end of the guide shaft section 122 away from the limiting shaft section 121 extends into the inner hole of the guide sleeve 11, and a gap is left between the outer peripheral surface of the guide shaft section 122 and the inner hole wall of the guide sleeve 11 to form an annular cavity; the central hole of the valve seat 12 passes through the limiting shaft section 121 and the guide shaft section 122 to form a valve port.

[0036] When the piston head 2 closes the valve port, the fluid between it and the guide shaft section 122 can be quickly discharged through the annular cavity to other areas of the inner hole of the guide sleeve 11, avoiding pressure retention and ensuring that the piston head 2 and the sealing surface are tightly fitted. When the piston head 2 resets, the fluid can quickly enter between the piston head 2 and the guide shaft section 122 through the annular cavity, avoiding negative pressure obstruction, accelerating the reset speed of the piston head 2, and improving the switching response efficiency of the solenoid valve.

[0037] In a further preferred embodiment, the outer cylindrical surface of the guide shaft section 122 gradually tapers towards the end away from the limiting shaft section 121, forming a truncated cone-shaped inclined surface; the inclined surface corresponds to the position of the multiple through holes 111 on the guide sleeve 11.

[0038] The inclined design of the outer cylindrical surface of the guide shaft section 122 makes the annular cavity flared at the corresponding through hole 111 position, guiding the fluid to flow smoothly along the inclined surface to both sides of the piston head 2, avoiding turbulence and dead zone caused by right-angle turning, and reducing fluid flow resistance. During the valve opening process, the valve needle 33 is disengaged from the piston head 2 by the moving iron core 32. After the piston head 2 loses its thrust, it will be pushed upward by the liquid pressure in the annular cavity. The flared annular cavity increases the force-bearing area of ​​the piston head 2, ensuring that the piston head 2 has sufficient thrust.

[0039] In this invention, the axial length of the valve seat 1 is equal to the depth of the mounting hole of the external pipeline. The end face of the valve seat 1 near the valve core assembly 3 is flush with the end face of the external pipeline, and the end face of the valve seat 1 away from the valve core assembly 3 is flush with the bottom wall of the mounting hole of the external pipeline, thereby achieving precise axial positioning of the valve seat 1 and preventing loosening or displacement.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A solenoid valve with a threadless valve seat, characterized in that, include: Valve seat, with valve port; The piston head is disposed in the inner hole of the valve seat; A valve core assembly is disposed above the valve seat, and one end of the valve needle of the valve core assembly extends into the valve seat and abuts against the end face of the piston head; A coil assembly, disposed outside the valve core assembly, is used to drive the valve needle to push the piston head to close the valve port; The outer cylindrical surface of the valve seat is smooth and has an annular gap with the mounting hole of the external pipeline. A first sealing ring is provided on the end face of the mounting hole of the external pipeline away from the valve port, and a second sealing ring is provided on the outer cylindrical surface of the valve seat near the valve port. The coil assembly has a bracket, and two sides of the bracket extend outward to form wing plates, which are fixed to an external pipeline by bolts.

2. The solenoid valve with a threadless valve seat according to claim 1, characterized in that, The valve core assembly includes a stationary iron core, a moving iron core, a valve needle, and a return spring; The stationary iron core is fixed to the end of the valve seat away from the valve port, and a through hole is provided at the axial center of the stationary iron core for the valve needle to pass through. The moving iron core is slidably disposed above the stationary iron core along the axial direction. One end of the valve needle is fixed to the axial center of the moving iron core by a limiting structure, and the other end passes through the through hole of the stationary iron core along the axial direction and abuts against the end face of the piston head away from the valve port. The reset spring is sleeved on the outside of the valve needle, and its two ends abut against the moving iron core and the stationary iron core respectively. It is used to drive the moving iron core to move the valve needle away from the piston head when the coil assembly is de-energized.

3. The solenoid valve with a threadless valve seat according to claim 2, characterized in that, The moving iron core has an axially oriented mounting cavity inside, and a shock-absorbing spring is installed inside the mounting cavity; The valve needle extends into the mounting cavity at one end near the moving iron core and abuts against one end of the shock-absorbing spring, while the other end of the shock-absorbing spring abuts against the bottom wall of the mounting cavity. The valve needle is elastically connected to the moving iron core via the damping spring, and can slide relative to the moving iron core along the axial direction of the mounting cavity; A plug is provided at the end of the mounting cavity.

4. The solenoid valve with a threadless valve seat according to claim 2, characterized in that, A magnetic shielding sleeve is provided on the outside of the valve core assembly; One end of the magnetic shielding sleeve is an open structure, and the other end is a sealed structure.

5. The solenoid valve with a threadless valve seat according to claim 1, characterized in that, The valve seat includes a guide sleeve and a valve port seat; The guide sleeve is a hollow cylindrical structure with a smooth outer cylindrical surface that forms an annular gap with the external pipeline mounting hole. The inner hole of the guide sleeve is provided with a first mounting groove and a second mounting groove at both ends. The stationary iron core of the valve core assembly is installed in the first mounting groove, and the valve seat is installed in the second mounting groove.

6. The solenoid valve with a threadless valve seat according to claim 5, characterized in that, The inner diameters of both the first and second mounting grooves are larger than the outer diameter of the piston head.

7. The solenoid valve with a threadless valve seat according to claim 5, characterized in that, Multiple through holes are evenly formed along the circumferential direction on the side wall of the guide sleeve, and the positions of the multiple through holes correspond to the positions of the liquid inlet holes of the external pipeline.

8. The solenoid valve with a threadless valve seat according to claim 5, characterized in that, The valve seat includes, in sequence along the axial direction, a limiting shaft section and a guide shaft section; The outer peripheral surface of the limiting shaft section is interference-fitted with the inner wall of the second mounting groove of the guide sleeve. The end of the guide shaft segment away from the limiting shaft segment extends into the inner hole of the guide sleeve, and a gap is left between the outer peripheral surface of the guide shaft segment and the inner wall of the guide sleeve to form an annular cavity; The central hole of the valve seat passes through the limiting shaft section and the guide shaft section to form a valve port.

9. The solenoid valve with a threadless valve seat according to claim 8, characterized in that, The outer cylindrical surface of the guide shaft section gradually tapers towards the end away from the limiting shaft section, forming a truncated cone-shaped inclined surface. The inclined surface corresponds to the position of the multiple through holes on the guide sleeve.

10. The solenoid valve with a threadless valve seat according to claim 1, characterized in that, The axial length of the valve seat is equal to the depth of the mounting hole of the external pipeline.

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