CN219510142U - Normally closed electromagnetic valve - Google Patents
Normally closed electromagnetic valve Download PDFInfo
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- CN219510142U CN219510142U CN202320565637.XU CN202320565637U CN219510142U CN 219510142 U CN219510142 U CN 219510142U CN 202320565637 U CN202320565637 U CN 202320565637U CN 219510142 U CN219510142 U CN 219510142U
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 388
- 229910052742 iron Inorganic materials 0.000 claims abstract description 194
- 230000003068 static effect Effects 0.000 claims abstract description 86
- 230000002093 peripheral effect Effects 0.000 claims abstract description 25
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 239000012530 fluid Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Magnetically Actuated Valves (AREA)
Abstract
The utility model belongs to the technical field of electromagnetic valves, and particularly relates to a normally closed electromagnetic valve. The normally closed electromagnetic valve comprises a valve body, a moving iron, a static iron, a valve clack, a spring, a coil and a sleeve, wherein the sleeve is fixed on the valve body; one of the first end of the static iron and the first end of the moving iron is provided with a taper hole, the other one is provided with a taper table, the cross section area of the taper table is gradually increased in the direction away from the taper hole, the cross section area of the taper hole is gradually reduced in the direction away from the taper table, and the taper hole is provided with an opening facing the direction of the taper table; when the normally closed electromagnetic valve is powered off, a preset distance is reserved between the top surface of the frustum and the bottom wall of the taper hole, and the maximum distance between the outer peripheral surface of the frustum and the side wall of the taper hole is smaller than the preset distance; when the normally closed electromagnetic valve is electrified, the static iron attracts the moving iron to the static iron until the top surface of the frustum is abutted with the bottom wall of the taper hole. The normally closed electromagnetic valve has simple structure, small volume and low cost.
Description
Technical Field
The utility model belongs to the technical field of electromagnetic valves, and particularly relates to a normally closed electromagnetic valve.
Background
The conventional normally closed electromagnetic valve generally comprises a valve body, an electromagnet, a coil, a valve clack and a sleeve fixed on the valve body, wherein the electromagnet comprises static iron and moving iron which are penetrated in the sleeve, the coil is arranged in the sleeve and sleeved on the periphery of the electromagnet, the static iron is fixed in the sleeve, and a spring is arranged between two opposite ends of the static iron and the moving iron. The valve body is provided with a valve cavity, the valve body is provided with an inlet and a working port, a valve port is arranged in the valve cavity, the inlet is communicated with the valve cavity, and the working port is communicated with the valve cavity through the valve port. The lower end of the moving iron stretches out of the sleeve and penetrates into the valve cavity of the valve body, and the valve clack is fixedly connected with the lower end of the moving iron. When the normally closed electromagnetic valve is powered off, the elastic force of the spring pushes the movable iron, so that the valve clack seals the valve port, and the inlet and the working port are disconnected. When the normally closed electromagnetic valve is electrified, the static iron is kept motionless, and the static iron attracts the moving iron, so that the moving iron overcomes the elastic force of the spring to move to drive the valve clack to move, and the valve port is opened, so that the inlet is communicated with the working port, and fluid can pass through the valve cavity.
The conventional normally closed electromagnetic valve has low flow requirement, so that the valve clack is sealed, the switching stroke of the valve clack is small, the gap between the moving iron and the static iron of the normally closed electromagnetic valve is small (about 0.5 mm), and the end surfaces of the moving iron and the static iron are generally planes, so that enough electromagnetic force can be provided for switching the valve clack. And the valve clack is driven to move between the static iron and the moving iron in a direct-acting mode, so that the response time is short.
However, when the flow requirement of the normally closed electromagnetic valve is high, the switching stroke of the valve clack for realizing sealing is large, and the gap between the moving iron and the static iron of the electromagnet is also large (about 5 mm). According to the conventional design, the valve port is sealed, or the radial size of the electromagnet is increased to ensure that enough electromagnetic force exists between the moving iron and the static iron to switch the valve clack, but the increase of the radial size of the electromagnet can cause cost rise, and the installation space of the normally closed electromagnetic valve can be increased; or a pilot-operated driving mode is adopted, and the normally closed electromagnetic valve is ensured to have enough driving force for the moving iron by adding the air cylinder so as to drive the valve clack to switch the valve port, however, the structure of the normally closed electromagnetic valve is complex, and the corresponding time is slowed down.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: aiming at the problem that the cost is increased because the radial size of an electromagnet needs to be increased when the gap between a movable iron and a static iron of the conventional normally closed electromagnetic valve is larger, the normally closed electromagnetic valve is provided.
In order to solve the technical problems, the embodiment of the utility model provides a normally closed electromagnetic valve, which comprises a valve body, a moving iron, a static iron, a valve clack, a spring, a coil and a sleeve, wherein the sleeve is fixed on the valve body, the valve body is provided with a valve cavity, a valve port is arranged in the valve cavity, the static iron and the moving iron are arranged in the sleeve in a penetrating way, a first end of the static iron is opposite to a first end of the moving iron, the spring is arranged between the first end of the static iron and the first end of the moving iron, the valve clack is connected with a second end of the moving iron penetrating into the valve cavity, and the coil is positioned in the sleeve and sleeved on the peripheries of the static iron and the moving iron; one of the first end of the static iron and the first end of the moving iron is provided with a taper hole, the other one of the first end of the static iron and the first end of the moving iron is provided with a taper table, the cross-sectional area of the taper table is gradually increased in a direction away from the taper hole, the cross-sectional area of the taper hole is gradually reduced in a direction away from the taper table, and the taper hole is provided with an opening facing the direction of the taper table;
when the normally closed electromagnetic valve is powered off, the spring applies thrust to the movable iron so that the valve clack seals the valve port, a preset distance is reserved between the top surface of the frustum and the bottom wall of the taper hole, and the maximum distance between the peripheral surface of the frustum and the side wall of the taper hole is smaller than the preset distance;
when the normally closed electromagnetic valve is electrified, the static iron is attracted by the static iron, and the static iron moves towards the static iron against the thrust of the spring until the top surface of the frustum is abutted with the bottom wall of the taper hole.
Optionally, the cone angle range of the taper hole is 15-35 degrees, the top surface size of the frustum is the same as the bottom wall size of the taper hole, and the cone angle of the frustum is smaller than the cone angle of the taper hole, so that a gap is always reserved between the outer peripheral surface of the frustum and the side wall of the taper hole.
Optionally, the cone angle of the taper hole ranges from 15 degrees to 35 degrees, the top surface size of the frustum is smaller than the bottom wall size of the taper hole, and the cone angle of the frustum is equal to the cone angle of the taper hole.
Optionally, an exhaust groove is formed in the outer peripheral surface of the moving iron, one end of the exhaust groove extends into the valve cavity, a compression space is formed between the outer peripheral surface of the frustum and the side wall of the taper hole in the moving process of the moving iron, and the other end of the exhaust groove is communicated with the compression space.
Optionally, the taper hole is arranged at the first end of the static iron, the frustum is arranged at the first end of the moving iron, the height of the frustum is larger than the depth of the taper hole, and the exhaust groove extends to the outer peripheral surface of the frustum.
Optionally, at least two exhaust grooves are arranged at intervals along the circumferential direction of the moving iron.
Optionally, a first guide groove extending along the axial direction of the bottom wall of the taper hole and opening towards the direction of the frustum is formed in the bottom wall of the taper hole, a second guide groove extending along the axial direction of the taper hole and opening towards the direction of the taper hole is formed in the frustum, one end of the spring is accommodated in the first guide groove, and the other end of the spring is accommodated in the second guide groove.
Optionally, the sleeve comprises a cylinder body and a cylinder top wall, the cylinder body is fixed on the valve body, the cylinder top wall is connected to one end of the cylinder body far away from the axial direction of the valve body, a first threaded hole extending along the axial direction of the cylinder body is formed in the cylinder top wall, a first external thread is formed in the outer peripheral surface of the second end of the static iron, and the second end of the static iron is in threaded connection with the cylinder top wall and fastened through a nut;
when the nut is loosened, the static iron is axially moved by rotating the static iron, so that the top surface of the frustum and the bottom wall of the taper hole have the preset distance.
Optionally, the valve clack includes skeleton and valve membrane, the skeleton is T shape, the skeleton includes pole portion and connects the head of the first end of pole portion, the second end of pole portion with move indisputable fixed connection, the valve membrane parcel the head of skeleton.
Optionally, the second end of the moving iron is provided with a second threaded hole extending along the axial direction of the moving iron, the outer circumferential surface of the second end of the rod part is provided with a second external thread, and the rod part is in threaded connection with the moving iron.
In the normally closed electromagnetic valve, opposite ends of the movable iron and the static iron are designed into a frustum shape and a taper hole shape, when the electromagnetic valve is powered off, a preset distance is reserved between the top surface of the frustum and the bottom wall of the taper hole, and when the electromagnetic valve is powered on, the movable iron moves towards the static iron by the preset distance, so that the top surface of the frustum is abutted against the bottom wall of the taper hole to drive the valve clack to open the valve port. The preset distance between the top surface of the frustum and the bottom wall of the taper hole is the opening and closing stroke of the valve clack, and the maximum distance between the outer peripheral surface of the frustum and the side wall of the taper hole is smaller than the preset distance, so that the magnetic attraction distance between the static iron and the moving iron is reduced, the normally closed electromagnetic valve with high flow requirement and large opening and closing stroke of the valve clack can ensure that the static iron and the moving iron have enough electromagnetic force under the condition that the radial size of the moving iron and the static iron is unchanged or increased less, and can magnetically attract the moving iron to move, and the phenomenon that the radial size of the moving iron and the static iron is increased or a pilot type driving mode is used to ensure that the static iron and the moving iron have enough magnetic attraction is avoided.
Drawings
FIG. 1 is a schematic view of a normally closed solenoid valve according to an embodiment of the present utility model;
FIG. 2 is a longitudinal cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of the moving iron of FIG. 1;
FIG. 4 is a longitudinal cross-sectional view of FIG. 3;
FIG. 5 is a schematic view of the structure of the static iron of FIG. 1;
fig. 6 is a longitudinal section of fig. 5.
Reference numerals in the specification are as follows:
1. a sleeve; 11. a cylinder; 12. a cartridge top wall; 2. a valve body; 21. a valve cavity; 22. a valve port; 23. an inlet; 24. a work port; 3. static iron; 31. taper holes; 32. a first guide groove; 4. a nut; 5. a moving iron; 51. a frustum; 52. a second guide groove; 53. an exhaust groove; 6. a valve flap; 61. a valve membrane; 62. a skeleton; 7. a spring; 8. a coil.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
As shown in fig. 1 and 2, an embodiment of the present utility model provides a normally closed solenoid valve that is installed on a pipe, and that is opened when the normally closed solenoid valve is energized, and through which fluid in the pipe can pass.
The normally closed electromagnetic valve comprises a valve body 2, a moving iron 5, a static iron 3, a valve clack 6, a spring 7, a coil 8 and a sleeve 1, wherein an inlet 23 and a working port 24 are arranged on the valve body 2, the valve body 2 is provided with a valve cavity 21, a valve port 22 is arranged in the valve cavity 21, the inlet 23 is communicated with the valve cavity 21, and the working port 24 is communicated with the valve cavity 21 through the valve port 22. The sleeve 1 is fixed on the valve body 2, the static iron 3 and the moving iron 5 are arranged in the sleeve 1 in a penetrating mode, the first end of the static iron 3 is opposite to the first end of the moving iron 5, the spring 7 is arranged between the first end of the static iron 3 and the first end of the moving iron 5, the valve clack 6 is connected to the second end of the moving iron 5 penetrating into the valve cavity 21, and the coil 8 is located in the sleeve 1 and sleeved on the peripheries of the static iron 3 and the moving iron 5.
One of the first end of the static iron 3 and the first end of the moving iron 5 is provided with a taper hole 31, the other is provided with a taper table 51, the cross-sectional area of the taper table 51 gradually increases in a direction away from the taper hole 31, the cross-sectional area of the taper hole 31 gradually decreases in a direction away from the taper table 51, and the taper hole 31 is provided with an opening towards the taper table 51.
When the normally closed electromagnetic valve is powered off, the spring 7 applies thrust to the moving iron 5, so that the moving iron 5 moves in a direction away from the static iron 3 to drive the valve clack 6 to seal the valve port 22. When the valve clack 6 closes the valve port 22, a preset distance is reserved between the top surface of the frustum 51 and the bottom wall of the taper hole 31, and the maximum distance between the outer peripheral surface of the frustum 51 and the side wall of the taper hole 31 is smaller than the preset distance.
When the normally closed electromagnetic valve is electrified, the static iron 3 magnetically attracts the moving iron 5, the moving iron 5 overcomes the thrust of the spring 7 to move towards the static iron 3 until the top surface of the frustum 51 is abutted with the bottom wall of the conical hole 31, and the moving iron 5 drives the valve clack 6 to open the valve port 22.
The preset distance between the top surface of the frustum 51 and the bottom wall of the taper hole 31 is the opening and closing stroke of the valve clack 6.
In the normally closed electromagnetic valve, the opposite ends of the movable iron 5 and the static iron 3 are designed into the shapes of the frustum 51 and the conical hole 31, when the electromagnetic valve is powered off, a preset distance is reserved between the top surface of the frustum 51 and the bottom wall of the conical hole 31, and when the electromagnetic valve is powered on, the movable iron 5 moves towards the static iron 3 for the preset distance, so that the top surface of the frustum 51 is abutted against the bottom wall of the conical hole 31 to drive the valve clack 6 to open the valve port 22. The preset distance between the top surface of the frustum 51 and the bottom wall of the taper hole 31 is the opening and closing stroke of the valve clack 6, and the maximum distance between the outer peripheral surface of the frustum 51 and the side wall of the taper hole 31 is smaller than the preset distance, so that the magnetic attraction distance between the static iron 3 and the moving iron 5 is reduced, and for the normally closed electromagnetic valve with high flow requirement and large opening and closing stroke of the valve clack 6, the magnetic attraction iron 5 can be magnetically attracted by ensuring that the static iron 3 and the moving iron 5 have enough electromagnetic force under the condition that the radial size of the moving iron 5 and the static iron 3 is unchanged or is increased less, and the magnetic attraction between the static iron 3 and the moving iron 5 is prevented from being ensured by increasing the radial size of the moving iron 5 and the static iron 3 or using a pilot driving mode.
In an embodiment, the taper angle of the taper hole 31 ranges from 15 ° to 35 °, the top surface of the frustum 51 has the same size as the bottom wall of the taper hole 31, and the taper angle of the frustum 51 is smaller than the taper angle of the taper hole 31, so that a gap is always formed between the outer peripheral surface of the frustum 51 and the side wall of the taper hole 31. Through simulation analysis of electromagnetic force, under the condition that the radial dimensions of the moving iron 5 and the static iron 3 are designed to be the radial dimensions of a conventional electromagnetic valve, the electromagnetic force between the moving iron 5 and the static iron 3 is larger when the cone angle of the conical hole 31 ranges from 15 degrees to 35 degrees. Moreover, a gap is formed between the outer peripheral surface of the frustum 51 and the wall of the taper hole 31, so that the frustum 51 is prevented from being blocked in the taper hole 31 when the moving iron 5 moves.
In other embodiments, the taper angle of the taper hole 31 ranges from 15 ° to 35 °, the top surface of the frustum 51 may be smaller than the bottom wall of the taper hole 31, and the taper angle of the frustum 51 is equal to the taper angle of the taper hole 31, so that a gap is always provided between the outer peripheral surface of the frustum 51 and the side wall of the taper hole 31.
In an embodiment, an exhaust groove 53 is disposed on the outer peripheral surface of the moving iron 5, one end of the exhaust groove 53 extends into the valve cavity 21, a compression space is provided between the outer peripheral surface of the frustum 51 and the side wall of the taper hole 31 during the moving of the moving iron 5, and the other end of the exhaust groove 53 is communicated with the compression space. Because the frustum 51 and the taper hole 31 are close to each other when the static iron 3 magnetically attracts the static iron 5, the space between the outer peripheral surface of the frustum 51 and the side wall of the taper hole 31 is continuously compressed, and the air exhaust groove 53 on the static iron 5 can exhaust the air in the compressed space to the valve cavity 21, so that the air in the compressed space is prevented from obstructing the moving iron 5 to move towards the static iron 3, and the response time is prolonged.
In one embodiment, at least two exhaust grooves 53 are provided at intervals in the circumferential direction of the moving iron 5.
Specifically, as shown in fig. 3 and 4, two exhaust grooves 53 are provided, and the two exhaust grooves 53 are symmetrically distributed in the circumferential direction of the moving iron 5.
In one embodiment, as shown in fig. 3 to 6, the taper hole 31 is provided at the first end of the stationary iron 3, the frustum 51 is provided at the first end of the moving iron 5, the height of the frustum 51 is greater than the depth of the taper hole 31, and the other end of the air discharge groove 53 extends to the outer circumferential surface of the frustum 51. The compression space between the outer circumferential surface of the frustum 51 and the side wall of the taper hole 31 is exposed to the outside of the moving iron 5, and the exhaust groove 53 provided on the outer circumferential surface of the moving iron 5 only needs to extend to the outer circumferential surface of the frustum 51, i.e., can communicate the compression space with the valve chamber 21, thereby exhausting the air in the compression space to the valve chamber 21, so as to reduce the influence of the exhaust groove 53 on the magnetic attraction area between the moving iron 5 and the static iron 3.
In an embodiment, the air vent groove 53 extends along the axial direction of the moving iron 5, and one end of the air vent groove 53 penetrates through the second end face of the moving iron 5.
In one embodiment, the bottom wall of the tapered hole 31 is provided with a first guide groove 32 extending in the axial direction thereof and opening in the direction of the frustum 51, the frustum 51 is provided with a second guide groove 52 extending in the axial direction thereof and opening in the direction of the tapered hole 31, one end of the spring 7 is accommodated in the first guide groove 32, and the other end of the spring 7 is accommodated in the second guide groove 52.
In one embodiment, the sleeve 1 comprises a cylinder 11 and a cylinder top wall 12, the cylinder 11 is fixed on the valve body 2, the cylinder top wall 12 is connected to one end of the cylinder 11 far away from the valve body 2 in the axial direction, a first threaded hole extending along the axial direction of the cylinder 11 is formed in the cylinder top wall 12, a first external thread is formed in the outer peripheral surface of the second end of the static iron 3, and the second end of the static iron 3 is in threaded connection with the cylinder top wall 12 and fastened through the nut 4.
When the moving iron 5, the static iron 3 and other parts are assembled, machining errors exist in all parts, so that the distance between the top surface of the frustum 51 and the bottom wall of the taper hole 31 after assembly cannot reach the preset distance, at this time, the nut 4 is loosened, the static iron 3 is axially moved by rotating the static iron 3, and the distance between the top surface of the frustum 51 and the bottom wall of the taper hole 31 is the preset distance. Compared with the condition that the dimensional accuracy requirement of each part is higher when the static iron 3 can not be adjusted, the normally closed electromagnetic valve has lower processing requirement on each part and lower processing cost.
In one embodiment, the cylinder 11 comprises a straight cylinder and a cylinder base, the straight cylinder is in threaded connection with the cylinder base, and the cylinder base is fixedly connected to the valve body 2 through a screw.
In one embodiment, the valve clack 6 includes a framework 62 and a valve membrane 61, the framework 62 is T-shaped, the framework 62 includes a stem and a head connected to a first end of the stem, a second end of the stem is fixedly connected to the moving iron 5, and the valve membrane 61 wraps the head of the framework 62.
Specifically, the valve film 61 is made of plastic, and the valve film 61 is integrally formed on the frame 62.
In an embodiment, the second end of the moving iron 5 is provided with a second threaded hole extending along the axial direction of the second end, the outer circumferential surface of the second end of the rod part is provided with a second external thread, and the rod part is in threaded connection with the moving iron 5, so that the valve clack 6 is detachably connected with the moving iron 5, and the assembly is convenient.
In other embodiments, the outer peripheral surface of the frustum 51 may be in contact with the sidewall of the bore 31.
In other embodiments, the taper angle of the taper hole 31 may be smaller than 15 ° or larger than 35 °, and in order to ensure a sufficiently large electromagnetic force between the static iron 3 and the moving iron 5, the radial dimensions of the static iron 3 and the moving iron 5 need to be appropriately increased.
In other embodiments, the vent groove 53 may be omitted.
In other embodiments, the taper hole 31 may be provided at the first end of the moving iron 5, the taper stand 51 may be provided at the first end of the stationary iron 3, and the exhaust groove 53 may include an axial section extending along the outer circumferential surface of the moving iron 5 and a radial section extending along the end surface of the moving iron 5, the axial section and the radial section being communicated, and the radial section extending to the side wall of the taper hole 31, for exhausting air in the compression space between the outer circumferential surface of the taper stand 51 and the side wall of the taper hole 31.
In other embodiments, only one exhaust groove 53 may be provided, and of course, three or more exhaust grooves may be provided according to the need and the size of the moving iron 5.
In other embodiments, only the first guide groove 32 may be provided, one end of the spring 7 is accommodated in the first guide groove 32, the other end of the spring 7 is abutted against the top surface of the frustum 51, or only the second guide groove 52 may be provided, one end of the spring 7 is accommodated in the second guide groove 52, and the other end of the spring 7 is abutted against the bottom wall of the taper hole 31.
In other embodiments, the stator 3 core may be fixed in the sleeve 1, and the axial position of the stator 3 core cannot be adjusted, at this time, the dimensional accuracy of each part of the solenoid valve is high.
In other embodiments, the valve flap 6 may be fixed to the moving iron 5 by one of insertion, clamping, and riveting.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. The normally closed electromagnetic valve comprises a valve body, a moving iron, a static iron, a valve clack, a spring, a coil and a sleeve, wherein the sleeve is fixed on the valve body, the valve body is provided with a valve cavity, the valve cavity is internally provided with a valve port, the static iron and the moving iron are arranged in the sleeve in a penetrating way, the first end of the static iron is opposite to the first end of the moving iron, the spring is arranged between the first end of the static iron and the first end of the moving iron, the valve clack is connected with the second end of the moving iron penetrating into the valve cavity, and the coil is positioned in the sleeve and sleeved on the peripheries of the static iron and the moving iron; the device is characterized in that one of the first end of the static iron and the first end of the moving iron is provided with a taper hole, the other one of the first end of the static iron and the first end of the moving iron is provided with a taper table, the cross-sectional area of the taper table is gradually increased in a direction away from the taper hole, the cross-sectional area of the taper hole is gradually reduced in a direction away from the taper table, and the taper hole is provided with an opening towards the taper table;
when the normally closed electromagnetic valve is powered off, the spring applies thrust to the movable iron so that the valve clack seals the valve port, a preset distance is reserved between the top surface of the frustum and the bottom wall of the taper hole, and the maximum distance between the peripheral surface of the frustum and the side wall of the taper hole is smaller than the preset distance;
when the normally closed electromagnetic valve is electrified, the static iron is attracted by the static iron, and the static iron moves towards the static iron against the thrust of the spring until the top surface of the frustum is abutted with the bottom wall of the taper hole.
2. The normally closed solenoid valve according to claim 1, wherein the taper angle of the taper hole ranges from 15 ° to 35 °, the top surface of the frustum has the same size as the bottom wall of the taper hole, and the taper angle of the frustum is smaller than the taper angle of the taper hole so that a gap is always provided between the outer peripheral surface of the frustum and the side wall of the taper hole.
3. The normally closed solenoid valve according to claim 1, wherein the taper angle of the taper hole ranges from 15 ° to 35 °, the top surface dimension of the frustum is smaller than the bottom wall dimension of the taper hole, and the taper angle of the frustum is equal to the taper angle of the taper hole.
4. The normally closed electromagnetic valve according to claim 1, wherein an exhaust groove is provided on the outer peripheral surface of the moving iron, one end of the exhaust groove extends into the valve cavity, a compression space is provided between the outer peripheral surface of the frustum and the side wall of the taper hole during the moving of the moving iron, and the other end of the exhaust groove is communicated with the compression space.
5. The normally closed solenoid valve according to claim 4, wherein the taper hole is provided at the first end of the stationary iron, the frustum is provided at the first end of the moving iron, the height of the frustum is greater than the depth of the taper hole, and the exhaust groove extends to the outer peripheral surface of the frustum.
6. The normally closed electromagnetic valve according to claim 4, wherein the exhaust groove is provided with at least two at intervals in a circumferential direction of the moving iron.
7. The normally closed electromagnetic valve according to claim 1, wherein a first guide groove extending in an axial direction thereof and opening in a direction of the frustum is provided on a bottom wall of the taper hole, a second guide groove extending in an axial direction thereof and opening in a direction of the taper hole is provided on the frustum, one end of the spring is accommodated in the first guide groove, and the other end of the spring is accommodated in the second guide groove.
8. The normally closed electromagnetic valve according to any one of claims 1 to 7, wherein the sleeve includes a cylinder body and a cylinder top wall, the cylinder body is fixed on the valve body, the cylinder top wall is connected to an axial end of the cylinder body away from the valve body, a first threaded hole extending along the axial direction of the cylinder body is provided on the cylinder top wall, a first external thread is provided on an outer peripheral surface of a second end of the static iron, and the second end of the static iron is in threaded connection with the cylinder top wall and fastened by a nut;
when the nut is loosened, the static iron is axially moved by rotating the static iron, so that the top surface of the frustum and the bottom wall of the taper hole have the preset distance.
9. The normally closed solenoid valve according to any one of claims 1 to 7, wherein the valve flap includes a skeleton and a valve membrane, the skeleton is T-shaped, the skeleton includes a stem portion and a head portion connected to a first end of the stem portion, a second end of the stem portion is fixedly connected to the moving iron, and the valve membrane wraps the head portion of the skeleton.
10. The normally closed electromagnetic valve according to claim 9, wherein the second end of the moving iron is provided with a second screw hole extending in an axial direction thereof, and the second end of the rod portion is provided with a second external screw thread on an outer peripheral surface thereof, and the rod portion is screw-coupled with the moving iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320565637.XU CN219510142U (en) | 2023-03-14 | 2023-03-14 | Normally closed electromagnetic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320565637.XU CN219510142U (en) | 2023-03-14 | 2023-03-14 | Normally closed electromagnetic valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219510142U true CN219510142U (en) | 2023-08-11 |
Family
ID=87548045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320565637.XU Active CN219510142U (en) | 2023-03-14 | 2023-03-14 | Normally closed electromagnetic valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219510142U (en) |
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2023
- 2023-03-14 CN CN202320565637.XU patent/CN219510142U/en active Active
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Address after: 518000, Building 1, 101, Evergrande Fashion Huigu Building, Fulong Road, Shanghenglang Community, Dalang Street, Longhua District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Security Medical Technology Co.,Ltd. Country or region after: China Address before: A1302, Shenzhen national engineering laboratory building, No.20, Gaoxin South 7th Road, high tech Zone community, Yuehai street, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: Shenzhen Security Medical Technology Co.,Ltd. Country or region before: China |