Electromagnetic coil and electromagnetic valve using same

Abstract

The electromagnetic coil comprises a clamping cover, a magnetizer, a coil body and a clamping spring, the clamping cover is made of magnetic conductive materials, the clamping cover is fixedly connected with the magnetizer, the coil body is provided with an installation hole, the magnetizer is provided with a magnetizer hole, and the clamping spring is arranged in the magnetizer hole. The installation hole and the magnetizer hole are oppositely arranged, one of the clamping cover and the magnetizer comprises a containing groove, the clamping spring is arranged in the containing groove, and the projection plane part of the clamping spring is located in the projection plane area of the magnetizer hole in the longitudinal direction of the coil body. The clamping cover, the magnetizer and the coil body are fixed through a packaging body, and the valve body is matched with the coil in a clamping mode. The electromagnetic coil clamping cover is made of the magnetic conductive material, leakage magnetic flux is reduced, coil attraction is improved, coil heating is reduced, and product reliability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and in particular to an electromagnetic coil and an electromagnetic valve using the electromagnetic coil. Background Art

[0002] The solenoid valve consists of two parts: the electromagnetic coil and the valve body. The electromagnetic coil is a key functional component that drives the valve core of the valve body to open / close the valve port of the solenoid valve by turning on / off the power. Fig. 9 The structure diagram of the electromagnetic coil provided by the background technology is shown. As shown in the figure, the electromagnetic coil includes a card cover 210', a magnetic conductor 220', a coil body 230', an encapsulation body 240', and a retaining spring 250'. The card cover 210' is used to limit the retaining spring 250'.

[0003] The solenoid valve of the existing structure has leakage magnetic flux, and how to improve the magnetic conductivity of the solenoid valve is a problem that the technicians in this field are concerned about. Summary of the invention

[0004] The purpose of the present application is to provide an electromagnetic coil, including a card cover, a magnetizer, a coil body and a retaining spring, wherein the card cover is made of a magnetic material, that is, the card cover material includes a magnetic material, the card cover is fixedly connected to the magnetizer, the coil body is provided with a mounting hole, the card cover is provided with a card cover hole, the magnetizer is provided with a magnetizer hole, the mounting hole, the card cover hole, and the magnetizer hole are axially connected, the card cover or the magnetizer includes a receiving groove, the retaining spring is provided in the receiving groove, along the longitudinal direction of the coil body, the projection surface of the retaining spring is partially located in the projection surface area of ​​the magnetizer hole, and the card cover, the magnetizer, and the coil body are encapsulated by an encapsulation body. The card cover material of the electromagnetic coil of the present application is a magnetic material, which improves the magnetic conductivity of the coil.

[0005] At the same time, the present application provides a solenoid valve using the solenoid coil, including a valve body, the valve body including a valve body component and a sleeve component, the sleeve component including a sleeve, a static iron core, and a moving iron core, the valve body component is fixedly connected to the sleeve, the static iron core is made of a magnetic conductive material, the sleeve component passes through the magnetic conductive hole, the mounting hole, and the cover hole, the sleeve component is provided with a locking portion, and the retaining spring is connected to the locking portion. The solenoid valve provided by the present invention uses the above-mentioned solenoid coil. Since the solenoid coil has the above-mentioned technical effects, the solenoid valve using the solenoid coil should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 Shown is a structural schematic diagram of a specific embodiment of the solenoid valve provided by the present invention;

[0007] Figure 2 Shown Figure 1Schematic diagram of the structure of the middle valve body;

[0008] Figure 3 Shown Figure 1 A schematic cross-sectional view of the middle coil;

[0009] Figure 4A Shown is a schematic view of a card cover;

[0010] Figure 4B Shown Figure 4A A cross-sectional schematic diagram of

[0011] Figure 5 Shown is a schematic cross-sectional view of a magnetic conductor;

[0012] Figure 6 Shown is a three-dimensional schematic diagram of a retaining spring;

[0013] Figure 7 Shown is a schematic diagram of the magnetic circuit analysis results of the present invention;

[0014] Figure 8 Shown is a schematic diagram of magnetic circuit analysis results of background technology;

[0015] Fig. 9 A schematic diagram of the structure of an electromagnetic coil provided as background technology.

[0016] Figure 1-Figure 7 Symbols and diagrams:

[0017] 1-valve body;

[0018] 110-valve body parts;

[0019] 120- casing component;

[0020] 1210- casing;

[0021] 1220-static iron core;

[0022] 1230-moving iron core;

[0023] 1221-positioning department;

[0024] 2- coil;

[0025] 210-card cover;

[0026] 2110-accommodation tank;

[0027] 2111-first limiting part;

[0028] 2112- second limiting part;

[0029] 2113-first arc portion;

[0030] 2114- second arc portion;

[0031] 2115-bottom wall of the groove;

[0032] 2116-Avoidance Department;

[0033] 2117-slot side wall;

[0034] 2120-card cover hole;

[0035] 2130-Positioning convex part;

[0036] 220-magnetic conductor;

[0037] 2210-magnetic conductor hole;

[0038] 2220-Location recess;

[0039] 2231-first plate portion;

[0040] 2232-second plate portion;

[0041] 2233-third plate;

[0042] 2234-Part 4;

[0043] 2235-fifth plate;

[0044] 2240-First gap;

[0045] 2250-second gap;

[0046] 230-coil body;

[0047] 2310-Mounting hole;

[0048] 240-encapsulation body;

[0049] 250-circlip;

[0050] X-face: the end face of the card cover that matches the magnetic conductor;

[0051] X' side - the other side opposite to X side;

[0052] Y surface - the end surface of the magnetic conductor that matches the card cover;

[0053] D-card cover hole;

[0054] d-magnetic conductor hole. DETAILED DESCRIPTION

[0055] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] It should be noted that the orientation terms such as up and down involved in this text are defined based on the positions of the components in Figure 3 the figure and the positions of the components relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that the orientation terms adopted in this text should not limit the scope of protection claimed in this application.

[0057] Figure 1 The following shows a schematic structural diagram of a specific embodiment of the solenoid valve provided by the present invention; Figure 2 The following shows Figure 1 a schematic structural diagram of the valve body in Figure 3 The following shows Figure 1 a sectional view schematic diagram of the coil in Figure 4A The following shows a view schematic diagram of the retaining cover; Figure 4B The following shows Figure 4A a sectional view schematic diagram of Figure 5 The following shows a sectional view schematic diagram of the magnetic conductor; Figure 6 The following shows a three-dimensional schematic diagram of the snap ring.

[0058] The solenoid valve of this embodiment, as Figure 1 shown, specifically includes a valve body 1 and an electromagnetic coil 2 (hereinafter referred to as the coil). Among them, as Figure 3 , Figure 4A , Figure 4B shown, the coil 2 includes a retaining cover 210, a magnetic conductor 220, a coil body 230, a potting body 240, and a snap ring 250. The retaining cover 210 is fixedly connected to the magnetic conductor 220. The X surface of the retaining cover 210 is provided with a receiving groove 2110. The receiving groove 2110 includes a groove bottom wall 2115 and groove side walls 2117. The groove side walls 2117 include a first limiting portion 2111, a second limiting portion 2112, a first arc portion 2113, and a second arc portion 2114. The groove bottom wall 2115 and the second arc portion 2114 form an avoidance portion 2116. The snap ring 250 is disposed in the receiving groove 2110. Without external force, the snap ring 250 is in a straight cylindrical shape. One end portion of the snap ring 250 is in limiting cooperation with the first limiting portion 2111, and the other end portion of the snap ring 250 is in limiting cooperation with the second limiting portion 2112. The retaining cover 210 is provided with a retaining cover hole 2120, the magnetic conductor 220 is provided with a magnetic conductor hole 2210, and the coil body 230 is provided with a mounting hole 2310. The retaining cover 210, the magnetic conductor 220, and the coil body 230 are potted and fixed by the potting body 240. After the retaining cover 210, the magnetic conductor 220, and the coil body 230 are potted and fixed, the retaining cover hole 2120, the magnetic conductor hole 2210, and the mounting hole 2310 are axially penetrated. Along the longitudinal direction of the coil body 230, a part of the projection surface of the snap ring 250 is located in the projection surface area of the magnetic conductor hole 2210. The valve body 1 passes through the mounting hole 2310, the magnetic conductor hole 2210, and the retaining cover hole 2120, and is connected to the coil 2 in a snap connection through the snap ring 250.

[0059] As Figure 2 , Figure 3 As shown, the aperture of the magnet hole 2210 is defined as d, and the aperture of the card cover hole 2120 is defined as D, then d is not greater than D. When the encapsulation body 240 is injection molded, the injection molding core rod passes through the magnet hole 2210, the mounting hole 2310, and the card cover hole 2120, and the injection molding material encapsulates and fixes the magnet 220, the coil body 230, and the card cover 210, and the card cover hole 2120 is gap-matched with the injection molding core rod to solve the center positioning problem of the product during injection molding.

[0060] like Figure 4A , Figure 4B As shown, the card cover 210 is made of magnetic conductive material, preferably formed by stamping of a plate, and a receiving groove 2110 is formed by stamping downward from the X surface of the card cover 210 through a mold. The receiving groove 2110 is in a concave state on the X surface of the card cover. Due to the characteristics of the material, in order to ensure the strength of the part after stamping, the depth t1 of the receiving groove formed by stamping should be controlled within 1.5 times the thickness t of the plate, that is, t1 is less than 1.5t. If t1 is greater than 1.5t, there is a risk of cracking during the stamping process or after the product is formed. Such a setting ensures the accommodating space of the receiving groove while also ensuring the strength of the part. The card cover hole 2120 is punched in the bottom wall 2115 of the receiving groove 2110. The card cover hole 2120 passes through the card cover 210. Since the second arc portion 2114 and the bottom wall 2115 of the groove form an avoidance portion 2116, the retaining spring 250 is partially located in the avoidance portion 2116. The first limiting portion 2111 connects the first arc-shaped portion 2113 and the second arc-shaped portion 2114, and the second limiting portion 2112 connects the first arc-shaped portion 2113 and the second arc-shaped portion 2114. The opposite surface of the X surface of the card cover 210 is defined as the X' surface. The X' surface of the card cover 210 is punched downward to form a positioning protrusion 2130. The positioning protrusion 2130 is in a concave state on the X' surface of the card cover 210, and the positioning protrusion 2130 is in a convex state on the X surface of the card cover 210. One or more positioning protrusions 2130 can be provided. The schematic diagram of the present application shows two positioning protrusions. It should be noted that the accommodating groove 2110 of the above scheme can also be provided on the magnetizer 220. By punching the Y surface to form a concave state, the retaining spring 250 can be accommodated. The specific scheme will not be repeated.

[0061] like Figure 5As shown, the magnetizer 220 is made of a magnetic material, preferably made of a bent plate, and includes a first plate portion 2231, the first plate portion 2231 is provided with a first notch 2240, the first notch 2240 is substantially semicircular, and the edge of the first plate portion 2231 is bent 90 degrees to extend to form a second plate portion 2232, the edge of the second plate portion 2232 is bent 90 degrees to extend to form a third plate portion 2233, and the edge of the third plate portion 2233 is bent 90 degrees to extend to form a fourth plate portion 2234. 234, the edge of the fourth plate portion 2234 is bent 90 degrees to extend to form a fifth plate portion 2235, and the fifth plate portion 2235 is provided with a second notch 2250, and the second notch 2250 is roughly semicircular. Through the arrangement of the first plate portion 2231, the second plate portion 2232, the third plate portion 2233, the fourth plate portion 2234, and the fifth plate portion 2235, the final state of the magnetizer 220 is a "mouth" shape, and the first notch 2240 and the second notch 2250 are arranged opposite to each other and roughly form a circle. The third plate portion 2233 includes a positioning recess 2220. For the convenience of processing, the positioning recess 2220 is a through hole, which can be directly punched and formed. The positioning recess 2220 can be set to one or more. The schematic diagram of the scheme of the present application shows two positioning recesses. The positioning recess 2220 and the positioning protrusion 2130 are assembled by concave and convex to position and assemble the card cover 210 and the magnetizer 220. The third plate portion 2233 includes a magnet hole 2210, which is a through hole formed by stamping. Further, after the card cover 210 and the magnet 220 are positioned and matched by the positioning protrusion 2130 and the positioning concave 2220, the card cover X surface is fitted with the magnet Y surface, and the peripheral wall of the card cover 210 and the magnet 220 fitting part is fixed by welding. On the one hand, the card cover 210 and the magnet 220 can be fixed to ensure the magnetic conductivity between the card cover 210 and the magnet 220, and on the other hand, it can prevent the injection molding material from entering the coil through the gap between the card cover 210 and the magnet 220 to affect the magnetic conductivity.

[0062] Furthermore, in order to ensure the assembly fit between the card cover 210 and the magnet 220, the flatness requirements of the X-surface of the card cover 210 and the Y-surface of the magnet 220 are very high. In order to ensure the flatness of the X-surface of the card cover 210, the distance between the wall of any side of the accommodating groove 2110 and the edge of the card cover 210 is defined as L1, and the material thickness of the card cover 210 is defined as t, then L1 is greater than 1.5t. When the accommodating groove 2110 is set in this way, the edge of the card cover 210 will not warp up, which can ensure the flatness of the X-surface of the card cover 210, further ensure the fit between the card cover 210 and the magnet 220 after assembly, and prevent the injection molding material from penetrating.

[0063] like Figure 6As shown, the spring 250 is cylindrical, and the material of the spring 250 is spring steel, which is elastic. The spring 250 is arranged in the receiving groove 2110, and one end of the spring 250 is restricted by the first limiting part 2111, and the other end of the spring 250 is restricted by the second limiting part 2112. After the card cover 210 and the magnet conductor 220 are fixedly connected and welded, the two ends of the spring 250 are restricted from moving. Further, the maximum distance between the first limiting part 2111 and the second limiting part 2112 is defined as L, and the aperture of the card cover hole is defined as D, then L is greater than 1.5D. In this way, the spring 250 main body can be guaranteed to have a rebound elasticity when the two ends of the spring 250 are restricted, and the stability of the structure after long-term use can be guaranteed.

[0064] like Figure 2 As shown in, the valve body 1 includes a valve body component 110 and a sleeve component 120. The sleeve component 120 includes a sleeve 1210, a static iron core 1220, and a moving iron core 1230. The sleeve 1210 is fixedly connected to the valve body component 110. The sleeve 1210 is fixedly connected to the static iron core 1220. The static iron core 1220 is made of a magnetic conductive material. The outer peripheral wall of the static iron core 1220 is gap-matched with the hole wall of the card cover hole 2120. The outer peripheral wall of the static iron core 1220 is recessed inward to form a card cover. The positioning portion 1221, that is, the locking portion 1221 is an annular groove. Projected along the longitudinal section of the static iron core 1220, the locking portion 1221 is roughly semicircular. When the static iron core 1220 passes through the cover hole 2120 and the locking portion 1221 cooperates with the retaining spring 250, part of the retaining spring 250 is located at the locking portion 1221, so that the static iron core 1220 and the retaining spring 250 are locked in place, thereby axially locking the valve body 1 and the coil 2, and limiting the coil 2 from axially escaping from the valve body 1 upward. When the static iron core 1220 passes through the magnetic conductor hole 2210, the static iron core 1220 contacts the retaining spring 250 and continues to be assembled in the direction of the cover hole 2120. The static iron core 1220 squeezes the retaining spring 250 toward the avoidance portion 2116 until part of the retaining spring 250 is located at the locking portion 1220. Further, Figure 7 FIG. 1 is a schematic diagram of the magnetic circuit analysis result of the present invention; Figure 7 As shown, the analysis results of this solution through dedicated software show that the arrowed lines represent the magnetic circuit, the card cover 210 has less leakage flux, that is, the magnetic circuit has more flow. Through testing, the magnetic force of the moving iron core 1230 of this solution is 8N; Figure 8 The figure shows the schematic diagram of the magnetic circuit analysis result of the background technology; Figure 8 As shown, through the same software analysis, the results show that the card cover 210' leaks magnetic flux, there is no magnetic circuit flow in the dotted box, and the magnetic force of the moving iron core of this solution is 7.2N. Through software analysis and actual test comparison, the magnetic force of the moving iron core 1230 of this solution is increased by 10%.

[0065] The above is only an explanation of a specific embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An electromagnetic coil, characterized in that: It includes a card cover, a magnet, a coil body and a retaining spring, the material of the card cover includes a magnetic material, the card cover is fixedly connected to the magnet, the coil body is provided with a mounting hole, the magnet is provided with a magnet hole, the mounting hole and the magnet hole are relatively arranged, the card cover or the magnet includes a receiving groove, the retaining spring is arranged in the receiving groove, along the longitudinal direction of the coil body, the projection surface of the retaining spring is partially located in the projection area of ​​the magnet hole, the card cover, the magnet and the coil body are fixed by an enclosure.

2. The electromagnetic coil according to claim 1, characterized in that The card cover is made by stamping a metal sheet, and the end face of the card cover that cooperates with the magnetic conductor is defined as an X face, and the X face is recessed to form the accommodating groove, and the accommodating groove includes a groove side wall, and the groove side wall includes a first limiting portion, a second limiting portion, a first arc-shaped portion, and a second arc-shaped portion. The first limiting portion connects the first arc-shaped portion and the second arc-shaped portion, and the second limiting portion connects the first arc-shaped portion and the second arc-shaped portion. The retaining spring is in the shape of a long strip, and one end of the retaining spring is restricted and matched with the first limiting portion, and the other end of the retaining spring is restricted and matched with the second limiting portion.

3. The electromagnetic coil according to claim 2, characterized in that The accommodating groove also includes a groove bottom wall, the second arc portion and the groove bottom wall form an avoidance portion, a part of the retaining spring is located in the avoidance portion, the groove bottom wall includes a card cover hole, and the card cover hole, the magnetic conductor hole, and the mounting hole are relatively arranged.

4. The electromagnetic coil according to claim 2, characterized in that Define the thickness of the metal plate as t, and the recessed depth of the receiving groove as t1, then: t1 is less than 1.5t.

5. The electromagnetic coil according to claim 2, characterized in that The minimum distance between any side wall of the accommodating groove and the outer side wall of the card cover is defined as L1, and L1 is greater than 1.5t.

6. The electromagnetic coil according to claim 3, characterized in that The maximum distance between the first limiting portion and the second limiting portion is defined as L, and the diameter of the card cover hole is defined as D, then L is greater than 1.5D.

7. The electromagnetic coil according to any one of claims 2 to 6, characterized in that: The surface of the magnetic conductor that cooperates with the card cover is defined as the Y surface, and either the X surface or the Y surface is provided with a positioning concave portion, and the other is provided with a positioning convex portion, and the positioning convex portion is concave-convexly positioned with the positioning concave portion.

8. The electromagnetic coil according to claim 1, characterized in that The surface of the magnetic conductor that cooperates with the card cover is defined as a Y surface, and the Y surface is recessed to form the accommodating groove.

9. A solenoid valve, comprising a valve body, wherein the valve body comprises a valve body component and a sleeve component, wherein the sleeve component comprises a sleeve, a static iron core and a moving iron core, wherein the sleeve is fixedly connected to the valve body component, and the static iron core is made of a magnetic conductive material, wherein: The solenoid valve also includes the electromagnetic coil as described in any one of claims 1 to 8, the sleeve component passes through the magnetic conductor hole and the mounting hole, the sleeve component is provided with a locking portion, and the retaining spring is locked and connected with the locking portion.

10. The solenoid valve according to claim 9, characterized in that: The static iron core is fixedly connected to the sleeve, the static iron core includes the locking portion, the locking portion is an annular groove, the retaining spring is roughly cylindrical, and the retaining spring is partially located at the locking portion.

11. An electromagnetic coil, characterized in that: It includes a card cover, a magnet, a coil body and a retaining spring, the card cover is made of a magnetic material, the card cover is fixedly connected to the magnet, the coil body is provided with a mounting hole, the card cover is provided with a card cover hole, the magnet is provided with a magnet hole, the mounting hole, the card cover hole and the magnet hole are axially connected, one of the card cover or the magnet includes a receiving groove, the retaining spring is provided in the receiving groove, along the longitudinal direction of the coil body, the projection surface of the retaining spring is partially located in the projection surface area of ​​the magnet hole, the card cover, the magnet and the coil body are encapsulated by an encapsulation body.

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