An electromagnet structure and its oil tank isolation valve

Abstract

The present invention discloses an electromagnet structure and its oil tank isolation valve, the electromagnet structure includes a lower shell, a coil frame, an enameled wire and a yoke iron plate; the through hole of the coil frame is arranged vertically, the enameled wire is wound in the winding window of the coil frame, and the yoke iron plate covers the upper flange of the coil frame; the lower shell is provided with a concave cavity with an opening facing upward, the top of the cavity wall of the concave cavity of the lower shell is provided with a support, and the edge of the yoke iron plate rests on the support of the lower shell; the yoke iron plate is covered with a layer of a first sealing colloid formed by injection, and the first sealing colloid abuts against the inner side of the top of the cavity wall of the concave cavity of the lower shell. The present invention can not only realize the long-term and effective sealing of the coil part in the electromagnet structure, avoid premature failure of the seal, so as to meet the higher sealing performance requirements; but also reduce the difficulty of product manufacturing and greatly reduce the product production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of isolation valves, and in particular to an electromagnet structure and an oil tank isolation valve thereof. Background Art

[0002] In plug-in hybrid vehicles, in order to meet the increasingly stringent national emission standards, the fuel tank system is usually equipped with a fuel tank isolation valve, which has become a standard feature to reduce oil and gas evaporation / leakage. The role of the fuel tank isolation valve is to relieve pressure and intake air under high pressure and negative pressure conditions to ensure that the fuel tank structure is within the pressure range, thereby protecting the fuel tank.

[0003] The existing technology of oil tank isolation valve usually includes an electromagnet structure. Since the oil tank isolation valve is in an oil and gas environment for a long time, in order to prevent oil and gas from penetrating into the coil part of the electromagnet structure (which is also the core component of the oil tank isolation valve), the existing technology usually seals the electromagnet structure. There are two main sealing methods in the existing technology. One is to use in-mold injection molding of enameled wire. This sealing method has high requirements on materials. In the injection molding environment, its heating temperature can reach 200-400℃, which poses considerable challenges to the temperature resistance and softening of the enameled wire. In addition, it has high requirements on the assembly components. Compared with other methods, the injection molding colloid flow pressure has greater pressure on the coil and enameled wire, and it is easy to produce pressure shock between the assembled parts. Compared with ordinary injection molding, the defective rate is high and the cost is relatively high during the injection molding process. The other method is to use a sealing ring to seal (which is also the most commonly used sealing method in the prior art). Since the sealing environment is immersed in an oil and gas environment, the sealing ring will be permanently deformed and shrunk when stimulated by external conditions (such as heat and pressure). Under long-term action, in an immersed and pressurized environment, there is a certain probability that oil and gas will penetrate the sealing ring, thereby causing a probability of seal failure. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide an electromagnet structure and a fuel tank isolation valve thereof. Through structural improvement, it is possible to achieve long-term and effective sealing of the coil part in the electromagnet structure and avoid premature failure of the seal to meet higher sealing performance requirements; it is also possible to reduce the difficulty of product manufacturing and greatly reduce the product production cost.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an electromagnet structure, including a lower shell, a coil frame, enameled wire and a yoke iron plate; the through hole of the coil frame is vertically arranged, the enameled wire is wound in the winding window of the coil frame, and the yoke iron plate covers the upper flange of the coil frame; the lower shell is provided with a concave cavity with an opening facing upward, and the top of the cavity wall of the concave cavity of the lower shell is provided with a support, and the edge of the yoke iron plate rests on the support of the lower shell; the yoke iron plate is covered with a layer of first sealing colloid formed by injection, and the first sealing colloid is against the inner side of the top end of the cavity wall of the concave cavity of the lower shell, so as to use the first sealing colloid to seal the intersection gap between the yoke iron plate and the lower shell, so as to prevent oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the intersection gap between the yoke iron plate and the lower shell and corroding the enameled wire.

[0006] In the yoke iron plate, a through hole is provided at a position corresponding to the through hole of the coil frame, which passes through the upper and lower surfaces, and the size of the through hole corresponds to the size of the through hole of the coil frame; the through hole of the yoke iron plate is provided with a flange upward along the hole edge, and the first sealing colloid is filled between the flange of the yoke iron plate and the inner side of the top end of the cavity wall of the concave cavity of the lower shell.

[0007] In the yoke iron plate, at the position corresponding to the upper flange covering the coil frame, there is a glue injection hole running through the upper and lower surfaces, so that the glue injected on the yoke iron plate can enter the joint gap between the yoke iron plate and the upper flange of the coil frame through the glue injection hole to form a second sealing colloid, thereby preventing oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the through hole of the coil frame through the joint gap between the yoke iron plate and the upper flange of the coil frame and corroding the enameled wire.

[0008] An annular glue injection groove is provided in the upper flange of the coil frame, corresponding to the position of the glue injection hole of the yoke iron plate, so as to utilize the annular second sealing colloid formed by the annular glue injection groove to prevent oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the through hole of the coil frame through the intersection gap between the yoke iron plate and the upper flange of the coil frame and corroding the enameled wire in all directions.

[0009] In the upper flange of the coil frame, a first annular glue stop groove is also provided in the position between the annular glue injection groove and the edge of the upper flange, and the depth of the first annular glue stop groove is greater than the depth of the annular glue injection groove; under the yoke iron plate, at the position corresponding to the first annular glue stop groove, a downwardly protruding annular first rib is provided, and the annular first rib is abutted against the first annular glue stop groove by an interference fit, so as to utilize the cooperation between the first rib and the first annular glue stop groove to block the glue injection material from flowing toward the edge direction of the upper flange, thereby preventing the glue injection material from flowing into the winding window of the coil frame.

[0010] The annular first convex rib on the lower side of the yoke plate is formed by punching a concave portion on the upper side of the yoke plate, and the first sealing colloid completely fills the concave portion on the upper side of the yoke plate.

[0011] A connecting groove is further provided between the annular glue injection groove and the first annular glue stopping groove, and the depth of the connecting groove is smaller than the depth of the annular glue injection groove.

[0012] The electromagnet structure also includes a moving iron core assembly, which is movably fitted in the through hole of the coil frame and the through hole of the yoke iron plate; in the upper flange of the coil frame, a second annular glue stop groove is also provided in the position between the annular glue injection groove and the through hole, and the depth of the second annular glue stop groove is greater than the depth of the annular glue injection groove; in the second annular glue stop groove of the coil frame, an upwardly protruding annular second rib is provided, and the annular second rib abuts against the bottom of the yoke iron plate, so as to utilize the cooperation between the second rib and the second annular glue stop groove to block the glue injection material from flowing in the direction of the through hole of the upper flange, thereby preventing the glue injection material from flowing into the through hole of the coil frame and affecting the movement of the moving iron core assembly.

[0013] The electromagnet structure also includes a static iron core and a yoke iron tube; the yoke iron tube is sleeved on the outside of the coil frame and covers the lower flange of the coil frame, and the upper end of the yoke iron tube is connected to the yoke iron plate; the static iron core is adapted in the through hole of the coil frame, and the bottom end of the static iron core is connected to the yoke iron tube; the upper part of the static iron core corresponds to the moving iron core assembly; the static iron core is adapted in the through hole of the coil frame by integral injection molding with the coil frame, so as to utilize the integral structure of the static iron core and the coil frame to eliminate the intersection gap between the static iron core and the through hole of the coil frame, and prevent the oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the intersection gap between the static iron core and the through hole of the coil frame and corroding the enameled wire.

[0014] At least one annular first sealing groove is also provided in the outer peripheral surface of the static iron core. When the static iron core is integrally molded with the coil frame by injection molding material, the injection molding material completely fills the first sealing groove.

[0015] Furthermore, it also includes an upper shell, the bottom end of which is connected to the top end of the lower shell; an outer side of the top end of the lower shell is provided with an annular second sealing groove, and a sealing ring is embedded in the second sealing groove at the top end of the lower shell; the bottom end of the upper shell is adapted to the outer side of the top end of the lower shell, and the sealing ring is clamped between the bottom end of the upper shell and the top end of the lower shell.

[0016] An oil tank isolation valve comprises the above-mentioned electromagnet structure.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The present invention adopts a support platform provided on the top of the cavity wall of the concave cavity of the lower shell, and the edge of the yoke plate rests on the support platform of the lower shell; the yoke plate is covered with a layer of first sealing colloid formed by injection, and the first sealing colloid is against the inner side of the top of the cavity wall of the concave cavity of the lower shell. This structure of the present invention can use the first sealing colloid to seal the intersection gap between the yoke plate and the lower shell, and prevent the oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the intersection gap between the yoke plate and the lower shell and corroding the enameled wire. The present invention can not only achieve long-term and effective sealing of the coil part in the electromagnet structure and avoid premature failure of the seal to meet higher sealing performance requirements; it can also reduce the difficulty of product manufacturing and greatly reduce the production cost of the product.

[0019] 2. The present invention adopts a method in which a glue injection hole is provided in the yoke plate at a position corresponding to the upper flange covering the coil frame, and an annular glue injection groove is provided in the upper flange of the coil frame at a position corresponding to the glue injection hole of the yoke plate. This structure of the present invention can be used to guide glue to the intersection gap between the yoke plate and the upper flange of the coil frame to form a second sealing colloid when glue is injected and sealed on the yoke plate, thereby preventing oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the through hole of the coil frame through the intersection gap between the yoke plate and the upper flange of the coil frame and corroding the enameled wire.

[0020] 3. The present invention adopts the upper flange of the coil frame, and a first annular glue-stopping groove is provided in the position between the annular glue-injecting groove and the edge of the upper flange; the lower side of the yoke iron plate is provided with an annular first convex rib protruding downward at the position corresponding to the first annular glue-stopping groove, and the annular first convex rib abuts against the first annular glue-stopping groove by interference fit. This structure of the present invention can utilize the cooperation between the first convex rib and the first annular glue-stopping groove to block the glue-injecting material from flowing toward the edge of the upper flange, and prevent the glue-injecting material from flowing into the winding window of the coil frame.

[0021] 4. The present invention adopts a second annular glue-stopping groove in the upper flange of the coil frame between the annular glue-injecting groove and the through hole; the second annular glue-stopping groove of the coil frame is provided with an annular second convex rib protruding upward, and the annular second convex rib abuts against the bottom of the yoke iron plate. This structure of the present invention can utilize the cooperation between the second convex rib and the second annular glue-stopping groove to block the glue-injecting material from flowing toward the through hole of the upper flange, and prevent the glue-injecting material from flowing into the through hole of the coil frame and affecting the action of the moving iron core assembly.

[0022] 5. The present invention adopts the method of fitting the static iron core into the through hole of the coil frame by integral injection molding with the coil frame, and at least one annular first sealing groove is also provided in the outer peripheral surface of the static iron core, and the injection molding material completely fills the first sealing groove. This structure of the present invention can, on the one hand, prevent the oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the intersection gap between the static iron core and the through hole of the coil frame and corroding the enameled wire, and on the other hand, it can reduce the use of sealing rings, simplify the assembly process, and improve assembly efficiency.

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, the electromagnet structure and the oil tank isolation valve thereof of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of an electromagnet structure (without an upper housing) of an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the exploded three-dimensional structure of the electromagnet structure (excluding the upper housing) of an embodiment of the present invention;

[0026] Figure 3 is a structural cross-sectional view of the electromagnet structure (excluding the upper housing) of an embodiment of the present invention;

[0027] Figure 4 It is a structural cross-sectional view of an electromagnet structure (applicable to a fuel tank isolation valve) of an embodiment of the present invention;

[0028] Figure 5 yes Figure 4 A magnified schematic diagram of part A in FIG.

[0029] Figure 6 yes Figure 4 A magnified schematic diagram of part B in FIG.

[0030] Figure 7 yes Figure 4 The enlarged schematic diagram of the C part in FIG.

[0031] Figure 8 is a schematic diagram of a coil frame of an electromagnet structure of an embodiment of the present invention;

[0032] Fig. 9 is a schematic diagram of a three-dimensional exploded structure of a fuel tank isolation valve according to an embodiment of the present invention;

[0033] Fig.10 is a structural cross-sectional view of a fuel tank isolation valve according to an embodiment of the present invention;

[0034] Fig.11 is an exploded schematic diagram of a partial structure of an embodiment of the present invention;

[0035] Fig.12 is a top view of a partial structure of an embodiment of the present invention;

[0036] Fig.13 is along Fig.12 A cross-sectional view of the DD line in FIG.

[0037] Fig.14 is along Fig.12 A cross-sectional view of line EE in FIG.

[0038] Fig.15 is along Fig.12 A cross-sectional view of line FF in FIG.

[0039] Fig.16 is along Fig.13 The three-dimensional structure cross-sectional view of the GG line in FIG. DETAILED DESCRIPTION

[0040] Example

[0041] See also Figures 1 to 8 As shown, an electromagnet structure of the present invention includes a lower shell 1, a static iron core 2, a coil frame 3, an enameled wire 4, a yoke iron cylinder 5 and a yoke iron plate 6; the coil frame 3 includes an upper flange 31, a lower flange 32 and a winding window 33 between the upper and lower flanges, the coil frame 3 is provided with a through hole 34 penetrating the upper and lower flanges, the through hole 34 of the coil frame 3 is vertically arranged, the enameled wire 4 is wound in the winding window 33 of the coil frame 3, the yoke iron plate 6 covers the upper flange 31 of the coil frame 3, the yoke iron cylinder 5 is sleeved on the outside of the coil frame 3 and covered on the lower flange 32 of the coil frame 3, and the upper end of the yoke iron cylinder 5 is connected to the yoke iron plate 6; the static iron core 2 is adapted in the through hole 34 of the coil frame 3, and the bottom end of the static iron core 2 is connected to the yoke iron plate 6. The bottom wall 51 of the yoke iron cylinder 5 is connected; the lower shell 1 is provided with a concave cavity 11 with an opening facing upward, and a support 13 is provided on the top of the cavity wall 12 of the concave cavity 11 of the lower shell 1, and the edge of the yoke iron plate 6 is placed on the support 13 of the lower shell 1; the yoke iron plate 6 is covered with a layer of first sealing colloid 71 formed by injection, and the first sealing colloid 71 is against the inner side of the top end 14 of the cavity wall 12 of the concave cavity 11 of the lower shell 1 (that is, the top of the support), so as to use the first sealing colloid 71 to seal the joint gap between the yoke iron plate 6 and the lower shell 1, so as to prevent the oil and gas outside the electromagnet structure from entering the winding window of the coil frame 3 through the joint gap between the yoke iron plate 6 and the lower shell 1 and corroding the enameled wire.

[0042] In the present invention, the definitions of upper, lower, etc., which indicate directions, merely indicate the relative positional relationship between components or between structures in components.

[0043] In this embodiment, in the yoke iron plate 6, a through hole 61 is provided which passes through the upper and lower surfaces at a position corresponding to the through hole 34 of the coil frame 3, and the size of the through hole 61 corresponds to the size of the through hole 34 of the coil frame 3; the through hole 61 of the yoke iron plate 6 is provided with a flange 62 along the hole edge upward, and the first sealing colloid 71 is filled between the flange 62 of the yoke iron plate 6 and the inner side of the top 14 of the cavity wall 12 of the concave cavity 11 of the lower shell 1.

[0044] In this embodiment, in the yoke iron plate 6, at a position corresponding to the upper flange 31 covering the coil frame 3, a glue injection hole 63 is provided which runs through the upper and lower surfaces, so that the glue injected on the yoke iron plate 6 can enter the joint gap between the yoke iron plate 6 and the upper flange 31 of the coil frame 3 through the glue injection hole 63 to form a second sealing glue 72, thereby preventing oil and gas outside the electromagnet structure from entering the winding window 33 of the coil frame 3 through the through hole 34 of the coil frame 3 through the joint gap between the yoke iron plate 6 and the upper flange 31 of the coil frame 3 and corroding the enameled wire.

[0045] In this embodiment, an annular glue injection groove 311 is provided in the upper flange 31 of the coil frame 3, corresponding to the position of the glue injection hole 63 of the yoke iron plate 6, so as to utilize the annular second sealing colloid formed by the annular glue injection groove 311 to prevent the oil and gas outside the electromagnet structure from entering the winding window 33 of the coil frame 3 through the through hole 34 of the coil frame 3 through the intersection gap between the yoke iron plate 6 and the upper flange 31 of the coil frame 3 and corroding the enameled wire.

[0046] In this embodiment, in the upper flange 31 of the coil frame 3, a first annular glue stop groove 312 is further provided between the annular glue injection groove 311 and the edge of the upper flange 31, and the depth of the first annular glue stop groove 312 is greater than the depth of the annular glue injection groove 311; below the yoke iron plate 6, at the position corresponding to the first annular glue stop groove 312, a downwardly protruding annular first rib 64 is provided, and the annular first rib 64 abuts against the first annular glue stop groove 312 by means of interference fit, so as to utilize the cooperation between the first rib 64 and the first annular glue stop groove 312 to block the glue injection material from flowing toward the edge direction of the upper flange 31, and prevent the glue injection material from flowing into the winding window 33 of the coil frame 3. A coil lead pin 76 is installed at the lower flange 32 of the coil frame 3, and a diode 77 is connected between the two coil lead pins 76.

[0047] In this embodiment, the annular first rib 64 on the lower surface of the yoke plate 6 is formed by punching a recess 65 on the upper surface of the yoke plate, and the first sealing colloid 71 completely fills the recess 65 on the upper surface of the yoke plate 6 .

[0048] In this embodiment, a connecting groove 313 is further provided between the annular glue injection groove 311 and the first annular glue stopping groove 312 , and the depth of the connecting groove 313 is smaller than the depth of the annular glue injection groove 311 .

[0049] In this embodiment, the electromagnet structure also includes a moving iron core assembly 73 adapted to the top of the static iron core 2 through a spring 75, and the moving iron core assembly 73 is movably fitted in the through hole 34 of the coil frame 3 and the through hole 61 of the yoke iron plate 6; in the upper flange 31 of the coil frame 3, a second annular glue stop groove 314 is also provided in the position between the annular glue injection groove 311 and the through hole 34, and the depth of the second annular glue stop groove 314 is greater than the depth of the annular glue injection groove 311; in the second annular glue stop groove 314 of the coil frame 3, an upwardly protruding annular second rib 315 is provided, and the annular second rib 315 abuts against the bottom of the yoke iron plate 6, so as to utilize the cooperation between the second rib 315 and the second annular glue stop groove 314 to block the glue injection material from flowing in the direction of the through hole 34 of the upper flange 31, and prevent the glue injection material from flowing into the through hole 34 of the coil frame 3 to affect the movement of the moving iron core assembly 73.

[0050] In this embodiment, the static iron core 2 is adapted to be inserted into the through hole 34 of the coil frame 3 by integral injection molding with the coil frame 3, so as to utilize the integral structure of the static iron core 2 and the coil frame 3 to eliminate the joint gap between the static iron core 2 and the through hole 34 of the coil frame 3, thereby preventing the oil and gas outside the electromagnet structure from entering the winding window 33 of the coil frame 3 through the joint gap between the static iron core 2 and the through hole 34 of the coil frame 3 and corroding the enameled wire.

[0051] In this embodiment, three annular first sealing grooves 21 are further provided in the outer circumferential surface of the static iron core 2 . When the static iron core 2 is integrally molded with the coil frame 3 by injection molding material, the injection molding material completely fills the first sealing grooves 21 .

[0052] Furthermore, it also includes an upper shell 8, the bottom end of which is connected to the top end of the lower shell 1; an outer side of the top end of the lower shell 1 is provided with an annular second sealing groove 15, and a sealing ring 74 is embedded in the second sealing groove 15 at the top end of the lower shell 1; the bottom end of the upper shell 8 is adapted to the outer side of the top end of the lower shell 1, and the sealing ring 74 is clamped between the bottom end of the upper shell 8 and the top end of the lower shell 1.

[0053] See also Figures 1 to 16As shown, a fuel tank isolation valve of the present invention comprises a valve body, a main valve 91, a main spring 92, a pressure relief valve core 93, a pressure relief spring 94, a fixing seat 95 and the electromagnet structure as described above, wherein the valve body and the upper shell 8 in the electromagnet structure are the same part; the valve body 8 is provided with a receiving chamber 81, the main valve 91 is installed in the receiving chamber 81 of the valve body 8 through the main spring 92, the valve body 8 is also provided with a first channel 82 for connecting to the fuel tank and a second channel 83 for connecting to the carbon canister; and the first channel 82 and the second channel 83 are isolated by the main valve 91; the main valve 91 is provided with a pressure relief port 911 and a pressure relief chamber 912 connected to the pressure relief port; the pressure relief port 911 is provided at the bottom of the pressure relief chamber 912, the fixing seat 95 is installed at the top of the pressure relief chamber 912, The pressure relief valve core 93 is installed in the pressure relief chamber 912 through the pressure relief spring 94 and corresponds to the position of the pressure relief port 911; the bottom end of the pressure relief spring 94 is against the pressure relief valve core 93, and the top end of the pressure relief spring 94 is against the fixed seat 95; the fixed seat 95 is provided with an internal thread 951, and the main valve 91 is provided with an external thread 913. The fixed seat 95 and the main valve 91 are height-adjustablely matched at the top of the pressure relief chamber 912 through threaded matching. An anti-rotation structure is also provided between the fixed seat 95 and the main valve 91, so as to utilize the anti-rotation structure to realize the anti-retraction of the fixed seat 95 and utilize the height adjustment of the fixed seat 95 to adjust the compression degree of the pressure relief spring 94, thereby realizing the pressure relief pressure adjustment by adjusting the elastic force of the pressure relief spring 94.

[0054] The main valve 91 is provided with a concave cavity 914 with an opening facing upward, and a convex column 916 is provided upward from the bottom wall 915 in the concave cavity 914, and the convex column 916 and the cavity wall 917 of the concave cavity 914 surround the pressure relief cavity 912, and the pressure relief port 911 is located in the bottom wall 915 next to the convex column 916, and a through hole 931 is provided in the middle of the pressure relief valve core 93, and the pressure relief valve core 93 is sleeved on the convex column 916 by means of the through hole 931 and corresponds to the position of the pressure relief port 911; the external thread 913 is provided on the top of the convex column 916, and the internal thread 951 is provided at the through hole in the middle of the fixing seat 95, and the fixing seat 95 is fixed to the top of the convex column 916 by threaded fitting.

[0055] The anti-rotation structure between the fixed seat 95 and the main valve 91 is composed of a plurality of evenly distributed protrusions 952 arranged around the fixed seat 95 and a plurality of evenly distributed grooves 918 arranged on the top of the cavity wall 917 of the concave cavity 914 of the main valve 91. When the plurality of protrusions 952 of the fixed seat 94 are slightly interference fit in the corresponding grooves 918 of the main valve 1, the anti-rotation structure can prevent the fixed seat 95 and the main valve 91 from retreating after being screwed together.

[0056] The first channel 82 is also connected to the pressure relief port 911, and the pressure relief port 911 is closed by the pressure relief valve core 93, which is equivalent to a one-way valve. When the pressure of the oil tank is high, the pressure relief valve core 93 is pushed open, the pressure relief port 911 is opened, the oil tank is connected to the pressure relief chamber 912, and the pressure relief chamber 912 is connected to the second channel 83. The second channel 83 is also connected to one end of the center hole 9161 of the main valve 91, and the other end of the center hole 9161 cooperates with the moving iron core assembly 73 in the electromagnet 6.

[0057] An electromagnet structure and its oil tank isolation valve of the present invention adopt a support platform 13 provided on the top of the cavity wall 12 of the concave cavity 11 of the lower shell 1, and the edge of the yoke iron plate 6 is placed on the support platform 13 of the lower shell 1; the yoke iron plate 6 is covered with a first sealing colloid 71 formed by injection, and the first sealing colloid 71 is against the inner side of the top 14 of the cavity wall 12 of the concave cavity 11 of the lower shell 1. This structure of the present invention can use the first sealing colloid 71 to seal the intersection gap between the yoke iron plate 6 and the lower shell 1, so as to prevent the oil and gas outside the electromagnet structure from entering the winding window 33 of the coil frame 3 through the intersection gap between the yoke iron plate 6 and the lower shell 1 and corroding the enameled wire. The present invention can not only realize the long-term and effective sealing of the coil part in the electromagnet structure, avoid premature failure of the seal, so as to meet the higher sealing performance requirements; but also reduce the difficulty of product manufacturing and greatly reduce the product production cost.

[0058] An electromagnet structure and its oil tank isolation valve of the present invention adopts a glue injection hole 63 penetrating the upper and lower surfaces in the yoke iron plate 6 at a position corresponding to the upper flange 31 covering the coil frame 3, and an annular glue injection groove 311 is provided in the upper flange 31 of the coil frame 3 at a position corresponding to the glue injection hole of the yoke iron plate. This structure of the present invention can be used to guide glue to the intersection gap between the yoke iron plate 6 and the upper flange 31 of the coil frame 3 when performing glue injection sealing on the yoke iron plate 6 to form a second sealing colloid 72, thereby preventing oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the through hole of the coil frame through the intersection gap between the yoke iron plate and the upper flange of the coil frame and corroding the enameled wire.

[0059] An electromagnet structure and its oil tank isolation valve of the present invention adopts a first annular glue-stopping groove 312 in the upper flange 31 of the coil frame 3, between the annular glue injection groove 311 and the edge of the upper flange 31; a downwardly protruding annular first rib 64 is provided at the position corresponding to the first annular glue-stopping groove under the yoke iron plate 6, and the annular first rib 64 abuts against the first annular glue-stopping groove 312 by interference fit. This structure of the present invention can utilize the cooperation between the first rib 64 and the first annular glue-stopping groove 312 to block the glue injection material from flowing toward the edge of the upper flange, and prevent the glue injection material from flowing into the winding window of the coil frame.

[0060] An electromagnet structure and its oil tank isolation valve of the present invention adopts a second annular glue-stopping groove 314 provided in the upper flange 31 of the coil frame 3 between the annular glue-injecting groove 311 and the through hole 34; an annular second convex rib 315 protruding upward is provided in the second annular glue-stopping groove 314 of the coil frame 3, and the annular second convex rib 315 abuts against the bottom of the yoke iron plate 6. This structure of the present invention can utilize the cooperation between the second convex rib 315 and the second annular glue-stopping groove 314 to block the glue-injecting material from flowing toward the through hole of the upper flange 31, and prevent the glue-injecting material from flowing into the through hole of the coil frame to affect the action of the moving iron core assembly.

[0061] An electromagnet structure and its oil tank isolation valve of the present invention adopt the method of fitting the static iron core 2 into the through hole 34 of the coil frame by integral injection molding with the coil frame 3. The outer peripheral surface of the static iron core 2 is also provided with three annular first sealing grooves 21, and the injection molding material completely fills the first sealing grooves 21. This structure of the present invention can, on the one hand, prevent the oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the intersection gap between the static iron core 2 and the through hole 34 of the coil frame 3 and corroding the enameled wire. On the other hand, it can reduce the use of sealing rings, simplify the assembly process, and improve assembly efficiency.

[0062] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. An electromagnet structure, comprising a lower housing, a coil frame, an enameled wire and a yoke iron plate; the through hole of the coil frame is arranged vertically, the enameled wire is wound in the winding window of the coil frame, and the yoke iron plate covers the upper flange of the coil frame; characterized in that: The lower shell is provided with a concave cavity with an opening facing upward, and a support is provided on the top of the cavity wall of the concave cavity of the lower shell, and the edge of the yoke plate rests on the support of the lower shell; the yoke plate is covered with a layer of first sealing colloid formed by injection, and the first sealing colloid is against the inner side of the top end of the cavity wall of the concave cavity of the lower shell, so as to use the first sealing colloid to seal the intersection gap between the yoke plate and the lower shell, so as to prevent the oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the intersection gap between the yoke plate and the lower shell and corroding the enameled wire; in the upper flange of the coil frame, there is a An annular glue injection groove; in the upper flange of the coil frame, a first annular glue stop groove is also provided in the position between the annular glue injection groove and the edge of the upper flange, and the depth of the first annular glue stop groove is greater than the depth of the annular glue injection groove; under the yoke iron plate, at the position corresponding to the first annular glue stop groove, a downwardly protruding annular first rib is provided, and the annular first rib is abutted against the first annular glue stop groove by an interference fit, so as to utilize the cooperation between the first rib and the first annular glue stop groove to block the glue injection material from flowing toward the edge direction of the upper flange, thereby preventing the glue injection material from flowing into the winding window of the coil frame.

2. The electromagnet structure according to claim 1, characterized in that: In the yoke iron plate, a through hole is provided at a position corresponding to the through hole of the coil frame, which passes through the upper and lower surfaces, and the size of the through hole corresponds to the size of the through hole of the coil frame; the through hole of the yoke iron plate is provided with a flange upward along the hole edge, and the first sealing colloid is filled between the flange of the yoke iron plate and the inner side of the top end of the cavity wall of the concave cavity of the lower shell.

3. The electromagnet structure according to claim 1 or 2, characterized in that: In the yoke iron plate, at the position corresponding to the upper flange covering the coil frame, there is a glue injection hole running through the upper and lower surfaces, so that the glue injected on the yoke iron plate can enter the joint gap between the yoke iron plate and the upper flange of the coil frame through the glue injection hole to form a second sealing colloid, thereby preventing oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the through hole of the coil frame through the joint gap between the yoke iron plate and the upper flange of the coil frame and corroding the enameled wire.

4. The electromagnet structure according to claim 3, characterized in that: The annular glue injection groove in the upper flange of the coil frame is arranged at a position corresponding to the glue injection hole of the yoke iron plate, so as to utilize the annular second sealing colloid formed by the annular glue injection groove to prevent oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the through hole of the coil frame through the intersection gap between the yoke iron plate and the upper flange of the coil frame and corroding the enameled wire in all directions.

5. The electromagnet structure according to claim 4, characterized in that: The annular first convex rib on the lower side of the yoke iron plate is formed by punching a concave portion on the upper side of the yoke iron plate, and the first sealing colloid completely fills the concave portion on the upper side of the yoke iron plate.

6. The electromagnet structure according to claim 4, characterized in that: A connecting groove is further provided between the annular glue injection groove and the first annular glue stopping groove, and the depth of the connecting groove is smaller than the depth of the annular glue injection groove.

7. The electromagnet structure according to claim 4, characterized in that: The electromagnet structure also includes a moving iron core assembly, which is movably fitted in the through hole of the coil frame and the through hole of the yoke iron plate; in the upper flange of the coil frame, a second annular glue stop groove is also provided in the position between the annular glue injection groove and the through hole, and the depth of the second annular glue stop groove is greater than the depth of the annular glue injection groove; in the second annular glue stop groove of the coil frame, an upwardly protruding annular second rib is provided, and the annular second rib abuts against the bottom of the yoke iron plate, so as to utilize the cooperation between the second rib and the second annular glue stop groove to block the glue injection material from flowing in the direction of the through hole of the upper flange, thereby preventing the glue injection material from flowing into the through hole of the coil frame and affecting the movement of the moving iron core assembly.

8. The electromagnet structure according to claim 7, characterized in that: The electromagnet structure also includes a static iron core and a yoke iron tube; the yoke iron tube is sleeved on the outside of the coil frame and covers the lower flange of the coil frame, and the upper end of the yoke iron tube is connected to the yoke iron plate; the static iron core is adapted in the through hole of the coil frame, and the bottom end of the static iron core is connected to the yoke iron tube; the upper part of the static iron core corresponds to the moving iron core assembly; the static iron core is adapted in the through hole of the coil frame by integral injection molding with the coil frame, so as to utilize the integral structure of the static iron core and the coil frame to eliminate the intersection gap between the static iron core and the through hole of the coil frame, and prevent the oil and gas outside the electromagnet structure from entering the winding window of the coil frame through the intersection gap between the static iron core and the through hole of the coil frame and corroding the enameled wire.

9. The electromagnet structure according to claim 8, characterized in that: At least one annular first sealing groove is also provided in the outer peripheral surface of the static iron core. When the static iron core is integrally molded with the coil frame by injection molding material, the injection molding material completely fills the first sealing groove.

10. The electromagnet structure according to claim 1, characterized in that: Furthermore, it also includes an upper shell, the bottom end of which is connected to the top end of the lower shell; an outer side of the top end of the lower shell is provided with an annular second sealing groove, and a sealing ring is embedded in the second sealing groove at the top end of the lower shell; the bottom end of the upper shell is adapted to the outer side of the top end of the lower shell, and the sealing ring is clamped between the bottom end of the upper shell and the top end of the lower shell.

11. A fuel tank isolation valve, characterized in that: The invention comprises an electromagnet structure as claimed in any one of claims 1 to 10.

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