CN113927379B - Method for repairing valve seat of electromagnetic valve and electromagnetic valve - Google Patents

Method for repairing valve seat of electromagnetic valve and electromagnetic valve Download PDF

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Publication number
CN113927379B
CN113927379B CN202111269095.3A CN202111269095A CN113927379B CN 113927379 B CN113927379 B CN 113927379B CN 202111269095 A CN202111269095 A CN 202111269095A CN 113927379 B CN113927379 B CN 113927379B
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China
Prior art keywords
circular table
valve core
grinding
valve
table surface
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CN113927379A (en
Inventor
韩杰
李涛
金飞
阮杭浙
谭进
原江滔
刘慧超
裴学强
廖明
蒋文结
甘万忺
夏崧浩
孙正旭
丁晨盼
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Sanmen Nuclear Power Co Ltd
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Sanmen Nuclear Power Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/48—Single-purpose machines or devices for grinding walls of very fine holes, e.g. in drawing-dies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F16K1/38—Valve members of conical shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

The invention discloses a method for repairing a valve seat of an electromagnetic valve and the electromagnetic valve 2 Polishing the top inner wall of the valve core sealing hole into an inclined plane angle alpha 1 The upper circular table surface; the inner wall of the bottom of the valve core sealing hole is polished into an inclined plane angle alpha 2 The lower circular table surface of (1); wherein alpha is 1 ＞α 2 The radius of the top opening of the upper circular table top is larger than that of the bottom opening, the edge of the bottom opening of the upper circular table top is coincided with the edge of the top opening of the lower circular table top, and the radius of the top opening of the lower circular table top is larger than that of the bottom opening. Through twice grinding, the inner wall of the valve core sealing hole is converted into an upper circular table surface and a lower circular table surface from a complete circular table surface, and the lower circular table surface is matched with the valve core for sealing. The size of the top opening of the lower circular table surface can be matched with the valve core, the lower circular table surface replaces the circular table surface and the valve core before grinding to realize effective sealing, and the adverse effect of the grinding process on the matching degree between the valve core and the valve seat is rarely or is avoided.

Description

Method for repairing valve seat of electromagnetic valve and electromagnetic valve
Technical Field
The invention relates to a method for repairing a valve seat of an electromagnetic valve and the electromagnetic valve, and belongs to the field of electromagnetic valve repair.
Background
In the nuclear power field, a plurality of branch pipes in an AP1000 primary circuit sampling system collect samples to two main pipes after sampling, and the samples are sent to a sampling analysis disc cabinet through the main pipes. The method is beneficial to simplifying system design and saving investment, but the requirement on the tightness of the solenoid valve on each sampling branch pipe is very high, and the leakage of any solenoid valve can cause the samples in other branch pipes to be polluted, so that the samples in the liquid sampling flow channel are mixed and cross-polluted, and the sampling representativeness is influenced. Meanwhile, the technical specification has sampling frequency and limit value requirements on chemical parameters of a primary circuit, a safety injection tank and a reactor core water replenishing tank, and a unit retreating mode is adopted if the sampling frequency and the limit value requirements are not met.
In order to solve the sealing problem of the electromagnetic valve, the valve core of the electromagnetic valve needs to be turned and repaired, and meanwhile, the valve seat is ground and repaired, but after the repair is completed every time, the electromagnetic valve can be leaked again in a short time, the electromagnetic valve leaks frequently, so that sampling is unqualified, and the safe and stable operation of a unit is seriously influenced.
Particularly, the valve core sealing hole on the valve seat needs to be ground for repairing the electromagnetic valve at each time, the opening size of the valve core sealing hole is gradually increased along with the increase of the grinding times, the valve core sealing hole cannot be well matched with the valve core finally, the electromagnetic valve is finally scrapped, and therefore the traditional repairing mode for the valve seat cannot effectively improve the sealing performance of the electromagnetic valve and can further damage the sealing performance of the electromagnetic valve.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for repairing a valve seat of an electromagnetic valve and the electromagnetic valve.
The technical scheme adopted by the invention is as follows:
a method for repairing the valve seat of electromagnetic valve is disclosed, which comprises a seat body with a valve core sealing hole, a circular table top and an alpha-angle inclined plane 2 The method comprises the following steps:
step S1: the inner wall of the top of the valve core sealing hole is polished into an inclined plane angle alpha 1 The upper circular table surface;
step S2: the inner wall of the bottom of the valve core sealing hole is polished into an inclined plane angle alpha 2 The lower circular table surface of (1);
wherein alpha is 1 ＞α 2 The radius of the top opening of the upper circular table top is larger than that of the bottom opening, the edge of the bottom opening of the upper circular table top is coincided with the edge of the top opening of the lower circular table top, and the radius of the top opening of the lower circular table top is larger than that of the bottom opening.
The beneficial effects of the invention are as follows:
through twice grinding, the inner wall of the valve core sealing hole is converted into an upper circular table surface and a lower circular table surface from a complete circular table surface, and the lower circular table surface is matched with the valve core for sealing. The size of the top opening of the lower circular table top can be reduced by the step S1, the size of the top opening of the lower circular table top can be enlarged by the step S2, the size of the top opening of the lower circular table top can be matched with the valve core finally through the matching of the step S1 and the step S2, the lower circular table top replaces the circular table top and the valve core before grinding to achieve effective sealing, and adverse effects of the grinding process on the matching degree between the valve core and the valve seat are reduced or avoided.
In step S1 of the invention, a first grinding rod is adopted to grind the valve core sealing hole, wherein the first grinding rod comprises a first rod body and a first grinding cone fixed at the lower end of the first rod body, and the half angle of the conical surface of the first grinding cone is alpha 1 ；
In step S2, the second grinding is adoptedThe grinding rod grinds the valve core sealing hole, wherein the second grinding rod comprises a second rod body and a second grinding cone fixed at the lower end of the second rod body, and the half angle of the conical surface of the second grinding cone is alpha 2 。
The invention also comprises a step S0, wherein the step S0 is before the step S1;
step S0: measuring to obtain the radius r of the top opening of the valve core sealing hole;
and after the step S2 is finished, the radius of the top opening of the lower circular table top is also r.
The invention also comprises a step S0', wherein the step S0' is before the step S1;
step S0': a positioning shaft sleeve is arranged above the valve core sealing hole;
in the step S1, a first rod body is arranged in the middle of a positioning shaft sleeve, and radial positioning is obtained through the positioning shaft sleeve in the rotation process of the first rod body;
and S2, taking the first rod body out of the middle of the positioning shaft sleeve, installing the second rod body in the middle of the positioning shaft sleeve, and obtaining radial positioning through the positioning shaft sleeve in the rotation process of the second rod body.
The invention also comprises a step S0'', a step S0'', a step S1 and a step S1 which are sequentially carried out;
step S0': and grinding the valve core sealing hole by using a second grinding cone.
In step S0', the second grinding cone is pasted with sand paper.
Alpha of the invention 1 -α 2 ＜5°。
The electromagnetic valve comprises an electromagnetic valve seat and a valve core obtained by a repairing method, wherein the outer wall of the lower end of the valve core is attached and sealed with a lower circular table surface, and a gap is reserved between the outer wall of the lower end of the valve core and an upper circular table surface.
Other features and advantages of the present invention will be disclosed in more detail in the following detailed description of the invention and the accompanying drawings.
Drawings
The invention is further described below with reference to the accompanying drawings:
fig. 1 is a front view structural schematic diagram of a valve element according to embodiment 1 of the present invention;
fig. 2 is a schematic top view of the valve element according to embodiment 1 of the present invention;
fig. 3 is a schematic structural view of a valve core clamp of an electromagnetic valve in a use state according to embodiment 1 of the present invention;
FIG. 4 isbase:Sub>A schematic view of the cross-sectional structure taken along the line A-A in FIG. 3;
FIG. 5 is a schematic view of the cross-sectional structure along the line B-B in FIG. 3;
FIG. 6 is a schematic sectional view showing a valve seat of a solenoid valve according to embodiment 2 of the present invention;
FIG. 7 is an enlarged view of the structure of FIG. 6 at C;
fig. 8 is a partially enlarged view of a seal hole of a valve body in embodiment 2 of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the following description, the appearances of the terms "inner", "outer", "upper", "lower", "left", "right", and the like, indicating an orientation or positional relationship, are only for convenience in describing the embodiments and for simplicity of description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Example 1:
referring to fig. 1-5, the present embodiment provides a solenoid valve core fixture, which includes a pipe body 1 and a plurality of locking screws 2, wherein locking screw holes 11 having the same number as the locking screws 2 are sequentially formed in a side wall of the pipe body 1 along a circumferential direction, each locking screw 2 is threadedly installed in a corresponding locking screw hole 11, and the locking screw 2 can be self-locked in the locking screw hole 11 by means of a threaded connection relationship between the locking screw 2 and the locking screw hole 11.
The head end of the locking screw rod 2 is positioned outside the pipe body 1, and the tail end of the locking screw rod 2 is positioned inside the pipe body 1. The head end of the locking screw 2 is rotated outside the pipe body 1, so that the locking screw 2 can be controlled to move along the self axial direction, and the position of the tail end of the locking screw 2 in the pipe body 1 can be adjusted.
Preferably, a bolt head 21 is fixed to the head end of the locking screw 2 to facilitate the control of the locking screw 2.
The valve core 3 is placed in the middle of the pipe body 1, the locking screws 2 are adjusted, the tail ends of all the locking screws 2 are pressed on the outer wall of the valve core 3 in a pressure equalizing mode, the valve core 3 can be locked in the middle of the pipe body 1, and when the tail ends of all the locking screws 2 are separated from the outer wall of the valve core 3, the valve core 3 can be taken out from the middle of the pipe body 1.
The bottom outer wall of case 3 is the case sealed face 31 of treating the turning, and the case sealed face 31 exposes in body 1 below through the opening of body 1 bottom when case 3 locks in the middle of body 1 to in turn the restoration. The shape of the valve core 3 is roughly a regular polygon prism, and in a general shape of the valve core 3 in the AP1000 primary circuit sampling system, the shape is roughly a regular hexagon prism, and correspondingly, the side wall of the valve core 3 comprises six plane side walls 32.
Relative with case 3 shape, body 1 is the pipe, and the inner wall of body 1 is the face of cylinder promptly, and all edges of all sides of case 3 all laminate with 1 inner wall of body when body 1 is middle to radially carrying out radial positioning to case 3 at body 1 footpath, guaranteeing that body 1 and case 3 are in coaxial state, guarantee the turning precision of turning device to case sealed face 31.
Of course, considering the actual process precision, the side edge of the valve core 3 may be difficult to be exactly attached to the inner wall of the tube body 1, so that a gap of 0.02mm at most may be usually left between the side edge of the valve core 3 and the inner wall of the tube body 1.
Normally, the outer wall of the valve core 3 at the side edge is a cambered surface 33, and the cambered surface 33 is a part of a cylindrical surface and corresponds to a radius R. The traditional valve core clamp realizes the positioning and locking of the valve core 3 by clamping the cambered surface 33 part instead of locking the screw rod 2. Because the cambered surface 33 is long and narrow, the area is very small, the valve core clamp is difficult to play a stable locking effect on the valve core 3 through the cambered surface 33, so that the axis of the valve core 3 is easy to deflect, the turning precision of the valve core sealing surface 31 is reduced, and finally the sealing property between the valve core 3 and the valve seat is reduced.
The pipe body 1 of the present embodiment does not need to lock the arc surface 33, and only needs to ensure that the arc surface 33 is tangent to the inner wall of the pipe body 1 or a gap of 0.02mm is reserved. Opposite to it, set up the tail end terminal surface of locking screw 2 into the plane, locking screw 2 can make its tail end terminal surface and plane lateral wall 32 fully laminate through axial displacement and compress tightly to realize the locking effect of case 3. Because the area of the plane side wall 32 is large, the contact area between the end surface of the tail end of the locking screw 2 and the plane side wall 32 can be increased as long as the outer diameter of the locking screw 2 is increased, so that the locking stability is ensured, and the turning precision is ensured in the process of turning the valve core 3. In addition, the end face of the tail end of the locking screw 2 is arranged to be a plane, so that damage to the outer wall of the valve core 3 can be reduced in the clamping process.
In order to achieve the above locking effect, the locking screw 2 needs to be disposed along the radial direction of the pipe body 1 so that the locking screw 2 can be perpendicular to one of the planar side walls 32. Also, each planar side wall 32 can therefore be fitted with only a maximum of one locking screw 2, so that the number of locking screws 2 is at most six.
If the number of the locking screws 2 is too small, the locking effect of the valve core 3 is not good, and if the number of the locking screws 2 is too large, the locking and unlocking processes of the valve core 3 are quite complicated. Therefore, the number of the locking screws 2 is moderate, and three locking screws are selected.
Preferably, the included angle between two adjacent locking screws 2 is 120 degrees, so as to ensure that the end faces of the tail ends of the three locking screws 2 can be attached to and pressed against the corresponding plane side walls 32, and simultaneously, the acting forces of the three locking screws 2 on the valve core 3 are symmetrical in a locking state, so that the axial deviation of the valve core 3 caused by the locking screws 2 is avoided as much as possible.
In the process of locking the valve core 3, one of the locking screws 2 is controlled, the valve core 3 is rotated to enable the tail end face of the locking screw 2 to be attached to one of the planar side walls 32, and at the moment, the other two locking screws 2 are perpendicular to the other two planar side walls 32 respectively, so that the other two locking screws 2 can be controlled to lock the valve core 3.
Example 2:
referring to fig. 6-8, the present embodiment provides a valve seat for an electromagnetic valve, which includes a seat body 5, a valve core sealing hole 51 is formed in the seat body 5, and the valve core sealing hole 51 is matched with a valve core sealing surface of a valve core to realize sealing.
In order to ensure the sealed effect between pedestal 5 and the case, this embodiment still provides a solenoid valve disk seat prosthetic devices, and solenoid valve disk seat prosthetic devices includes first grinding rod 4 and second grinding rod, is used by first grinding rod 4 and the cooperation of second grinding rod in order to grind to the inner wall of case sealed hole 51.
Specifically, the first grinding rod 4 includes a first rod body and a first grinding cone 41 fixed at a lower end of the first rod body, and the second grinding rod includes a second rod body and a second grinding cone fixed at a lower end of the second rod body. The first grinding cone 41 and the second grinding cone are controlled by the first rod body and the second rod body respectively, so that the first grinding cone 41 and the second grinding cone move to the valve core sealing hole 51 and are ground in a rotating mode.
Wherein the half angle of the first grinding cone 41 is alpha 1 The half angle of the conical surface of the second grinding cone is alpha 2 ，α 1 ＞α 2 。
The inner wall of the traditional valve core sealing hole 51 is a single complete circular table surface, and the inclined angle of the circular table surface is alpha 2 . As the number of times of grinding increases, the size of the spool seal hole 51 becomes larger, the area of the inner wall of the spool seal hole 51 increases, which results in an increase in the contact area between the inner wall of the spool seal hole 51 and the spool seal surface, and in the case where the valve closing force is constant, the specific seal pressure decreases, which tends to reduce the reliability of the valve seal. In addition, as the number of times of grinding is increased, the diameter of the top opening of the valve core sealing hole 51 may be larger than that of the top of the valve core sealing surface, so that the valve core and the valve seat cannot be matched and sealed, and the valve is directly scrapped.
However, in the present embodiment, the inner wall of the valve plug sealing hole 51 after being ground includes two circular table surfaces, wherein the top inner wall of the valve plug sealing hole 51 is the upper circular table surface 511, the bottom inner wall of the valve plug sealing hole 51 is the lower circular table surface 512, the bottom opening edge of the upper circular table surface 511 and the top opening edge of the lower circular table surface 512The edges are overlapped, the top opening radius of the upper circular table surface 511 is larger than the bottom opening radius of the upper circular table surface 511, and the top opening radius of the lower circular table surface 512 is larger than the bottom opening radius of the lower circular table surface 512. Wherein the bevel angle of the upper circular table surface 511, which is matched with the first grinding cone 41, is alpha 1 And the bevel angle of the lower circular table 512 is alpha, which is matched with the second grinding cone 2 。
Specifically, the original spool seal hole 51 is used (at this time, the inner wall of the spool seal hole 51 is a complete circular table surface and the bevel angle is α) 2 ) The grinding process of (a) is as follows:
step S0: measuring to obtain the radius r of the top opening of the valve core sealing hole 51;
step S0': a positioning shaft sleeve 52 is arranged above the valve core sealing hole 51, the positioning shaft sleeve 52 and the valve core sealing hole 51 are coaxially arranged, and the measurement of r in the step S0 cannot be influenced because the positioning shaft sleeve 52 is arranged after the step S0;
step S0': grinding the valve core sealing hole 51 by using a second grinding cone, thereby eliminating particles on the inner wall of the valve core sealing hole 51, and improving the smoothness of the inner wall of the valve core sealing hole 51, thereby facilitating the subsequent grinding process, and therefore, the second grinding cone is pasted with sand paper in the step;
step S1: the first grinding cone 41 is rotatably disposed at the valve plug sealing hole 51 for grinding, so that the inner wall of the top of the valve plug sealing hole 51 is gradually ground into a slope angle α 1 The upper circular table 511, correspondingly, the inner wall of the bottom of the valve core sealing hole becomes an inclined plane angle alpha 2 Along with the grinding process of the upper circular table top 511, the radius of the top opening of the lower circular table top 512 is gradually reduced, meanwhile, the area of the lower circular table top 512 is gradually reduced, and at the moment, the radius of the top opening of the lower circular table top 512 is smaller than r;
step S2: the first grinding cone 41 is taken out and the second grinding cone is rotatably arranged on the lower circular table surface 512 for grinding because of alpha 1 ＞α 2 Therefore, the second grinding cone will not contact the upper circular table surface 511 during the grinding process, and the size of the top opening of the lower circular table surface 512 is gradually increased as the grinding process of the second grinding cone proceeds,the second grinding cone stops rotating until the radius of the top opening of the lower circular table 512 reaches r.
Through the mode, the geometrical parameters (opening radius and area) of the ground lower circular table surface 512 are almost the same as those of the valve core sealing hole 51 before grinding, the lower circular table surface 512 obtained after grinding can maintain a constant contact sealing area with a valve core sealing surface, and the opening radius of the top of the lower circular table surface 512 can be matched with the radius of the valve core sealing surface, so that the matching degree between the valve core and the seat body 5 can not be reduced or is rarely reduced in the grinding process, and the sealing reliability of the valve seat of the electromagnetic valve after grinding and repairing is effectively improved.
α 1 And alpha 2 The difference between them should not be too large, generally speaking, alpha 1 -α 2 Is less than 5 degrees. For example, this embodiment α 1 Is 33 DEG alpha 2 Is 30 deg.. The inner wall (a complete circular table with the inclined plane angle of 30 degrees) of the existing valve core sealing hole 51 is ground through the first grinding cone 41, so that part of the inner wall of the valve core sealing hole 51 can be converted into the upper circular table 511, the rest of the inner wall of the valve core sealing hole 51 is converted into the lower circular table 512, and the difference between 33 degrees and 30 degrees is small, so that the workload of the grinding process of the first grinding cone 41 is not too large.
In step S0' and step S2, the second rod is disposed in the middle of the positioning sleeve 52, so that the rotation process of the second rod obtains radial movement, and the axial movement of the second rod is guided. In step S1, the first rod is disposed in the middle of the positioning sleeve 52, so that the rotation process of the first rod obtains radial movement, and the axial movement of the first rod is guided.
When the seat body 5 ground by the first grinding rod 4 and the second grinding rod needs to be ground and repaired again, the step S3 and the step S4 may be continued after the step S2.
And step S3: grinding the upper circular table surface 511 by the first grinding rod 4 to reduce the top opening of the lower circular table surface 512;
and step S4: the lower circular table surface 512 is ground by the second grinding rod to increase the top opening of the lower circular table surface 512 until the radius of the top opening of the lower circular table surface 512 returns to r.
Therefore, the valve core sealing hole 51 can be ground and repaired for multiple times by adopting the first grinding rod 4 and the second grinding rod, and the grinding and repairing device is suitable for grinding and repairing the seat body 5 for a long time.
Example 3:
this embodiment provides an electromagnetic valve, including grind the solenoid valve disk seat after restoreing in embodiment 2 and the case in embodiment 1, case lower extreme outer wall (the sealed face of case) is sealed with the laminating of lower round platform face, and leaves the space between case lower extreme outer wall (the sealed face of case) and the last round platform face, avoids the sealed face of case and goes up the contact of round platform face.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims (7)

1. The method for repairing the valve seat of the electromagnetic valve is characterized in that the valve seat of the electromagnetic valve comprises a seat body, a valve core sealing hole is formed in the seat body, the inner wall of the valve core sealing hole is a circular table surface, and the inclined plane angle is alpha 2 The method comprises the following steps:
step S1: grinding the valve core sealing hole by adopting a first grinding rod, wherein the first grinding rod comprises a first rod body and a first grinding cone fixed at the lower end of the first rod body, and the half angle of the conical surface of the first grinding cone is alpha 1 Polishing the top inner wall of the valve core sealing hole into an inclined plane angle alpha 1 The upper circular table surface of (1);
step S2: grinding the valve core sealing hole by adopting a second grinding rod, wherein the second grinding rod comprises a second rod body and a second grinding cone fixed at the lower end of the second rod body, and the half angle of the conical surface of the second grinding cone is alpha 2 Polishing the inner wall of the bottom of the valve core sealing hole into an inclined plane angle alpha 2 The lower circular table surface of (1);
wherein alpha is 1 ＞α 2 The radius of the top opening of the upper circular table surface is larger than that of the bottom openingThe radius of the opening is larger than that of the bottom opening, the bottom opening edge of the upper circular table top is overlapped with that of the top opening edge of the lower circular table top, and the top opening radius of the lower circular table top is larger than that of the bottom opening.
2. The method for repairing a valve seat of a solenoid valve according to claim 1, further comprising step S0, wherein step S0 precedes step S1;
step S0: measuring to obtain the radius r of the top opening of the valve core sealing hole;
and after the step S2 is finished, the radius of the top opening of the lower circular table top is also r.
3. The method for repairing a valve seat of a solenoid valve according to claim 2, further comprising step S0', step S0' being prior to step S1;
step S0': a positioning shaft sleeve is arranged above the valve core sealing hole;
in the step S1, a first rod body is arranged in the middle of a positioning shaft sleeve, and radial positioning is obtained through the positioning shaft sleeve in the rotation process of the first rod body;
in the step S2, the first rod body is taken out from the middle of the positioning shaft sleeve, the second rod body is installed in the middle of the positioning shaft sleeve, and radial positioning is achieved through the positioning shaft sleeve in the rotating process of the second rod body.
4. The method for repairing a valve seat of a solenoid valve according to claim 3, further comprising a step S0 ", wherein the steps S0, S0', S0", S1, and S1 are performed in this order;
step S0': and grinding the valve core sealing hole by using a second grinding cone.
5. The method for repairing a valve seat of a solenoid valve according to claim 4, wherein in step S0 ", a piece of sandpaper is attached to the second grinding cone.
6. Method for repairing a valve seat of a solenoid valve according to claim 2, characterized in that α is 1 -α 2 ＜5°。
7. An electromagnetic valve, characterized by comprising an electromagnetic valve seat and a valve core obtained by the repairing method of any one of claims 1 to 6, wherein the outer wall of the lower end of the valve core is in fit sealing with a lower circular table surface, and a gap is reserved between the outer wall of the lower end of the valve core and an upper circular table surface.
CN202111269095.3A 2021-10-29 2021-10-29 Method for repairing valve seat of electromagnetic valve and electromagnetic valve Active CN113927379B (en)

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