An electromagnetic valve having an improved valve body structure

Abstract

The electromagnetic valve with improved valve body structure comprises a stator assembly and a valve body, the stator assembly comprises a coil assembly and a stator shell, the coil assembly comprises a coil holder, an enameled wire, a plug fixed to the coil holder and a magnetic yoke arranged outside the coil holder, the magnetic yoke comprises a plate-shaped radial part and an axial part connected with the radial part and provided with a through magnetic yoke through hole, characterized in that: the stator shell is molded on the coil assembly, which surrounds a stator cavity with the axial part of the magnetic yoke and the coil holder, the enameled wire, the connection between the enameled wire and the plug and the radial part of the magnetic yoke are accommodated in the stator cavity, the valve body is injection molded in the inner cavity of the stator assembly, comprising a valve body main part covering the radial inner wall surface of the coil holder and a valve body connecting part extending axially at one end of the coil holder, and the valve body is provided with an axial through installation cavity in the center. Through the above design, the stability of the connection of each part of the electromagnetic valve can be improved, and the lightweight of the electromagnetic valve can be realized at the same time.

Description

Technical Field

[0001] This utility model relates to a solenoid valve, and more particularly to a solenoid valve with an improved valve body structure, which has IPC classification number F16K31 / 06 (2006.01). Background Technology

[0002] Existing solenoid valves, such as the one described in prior patent application CN212839419U entitled "A Hot Water Solenoid Valve for a Coffee Machine," include a coil, a magnetic shielding sleeve mounted on the coil, and a stationary iron core and a moving iron core installed within the magnetic shielding sleeve. The magnetic shielding sleeve typically has an annular flange and is fixed to the valve body by a locking nut. Because the magnetic shielding sleeve and the stationary iron core are usually made of metal, and the magnetic shielding sleeve requires a certain thickness to form the annular flange (which must be thick enough to prevent damage), the overall weight of the solenoid valve is large, hindering the lightweight design of equipment using solenoid valves. Therefore, there is a need for improvement. Utility Model Content

[0003] To address the problems described in the background section, this utility model provides the following technical solution:

[0004] An improved solenoid valve with an improved valve body structure includes a stator assembly and a valve body. The stator assembly includes a coil assembly and a stator housing. The coil assembly includes a coil frame, an enameled wire, a insert fixed on the coil frame, and a magnetic yoke disposed on the outside of the coil frame. The magnetic yoke includes a plate-shaped radial portion and an axial portion connected to the radial portion and having a through-hole. The stator housing is molded onto the coil assembly, and together with the axial portion of the magnetic yoke and the coil frame, it forms a stator cavity. The enameled wire, the connection point between the enameled wire and the insert, and the radial portion of the magnetic yoke are accommodated within the stator cavity. The valve body is injection molded into the inner cavity of the stator assembly and includes a valve body main body covering the radial inner wall of the coil frame and a valve body connecting portion extending axially from one end of the coil frame. The center of the valve body has an axially penetrating mounting cavity.

[0005] The improved valve body structure of this utility model is an electromagnetic valve in which the valve body is injection molded onto the stator assembly. This reduces the number of parts required to fix the valve body to the stator assembly, improves the connection strength between the valve body and the stator assembly, and the plastic valve body replaces the existing metal magnetic shielding sleeve, which helps to reduce the weight of the electromagnetic valve. Through the above design, the connection stability of each part of the electromagnetic valve can be improved, while facilitating the lightweighting of the electromagnetic valve.

[0006] Furthermore, the solenoid valve also includes a valve cover fixedly connected to the valve body connection portion. The valve cover has an inlet and an outlet with parallel or overlapping axes. The extension direction of the portion of the insert exposed outside the stator housing is the same as the extension direction of the inlet or outlet.

[0007] Furthermore, the solenoid valve also includes a metal ring and a columnar bottom valve seat inserted and installed on the other side of the valve body mounting cavity along the axial direction. The bottom valve seat has an annular first groove at one end facing the valve cover, and the metal ring is fixed in the first groove.

[0008] Furthermore, the solenoid valve also includes a gland, and the bottom valve seat has an annular flange that protrudes radially outward at the end opposite to the valve cover. The gland presses the flange tightly to fix the bottom valve seat to the valve body.

[0009] Furthermore, the axial end face of the valve body facing the gland is recessed to form a valve body groove with a trapezoidal axial cross section. The end face of the gland facing the valve body is provided with an annular valve cover boss. The gland is inserted into the valve body groove through the valve cover boss and welded to the valve body.

[0010] Furthermore, the solenoid valve also includes a moving iron core mounted on the valve body and a return spring sleeved on the radially outer side of the moving iron core. The moving iron core is provided with an axially penetrating mounting hole. Starting from the end adjacent to the bottom valve seat, the mounting hole is provided with an elastic element, a second spring, a baffle, a first spring, and a first plug in sequence.

[0011] Furthermore, the bottom valve seat has a valve seat boss protruding on the axial end face facing the moving iron core, and the center of the bottom valve seat has an axially penetrating valve seat through hole, with the elastic element arranged opposite to the valve seat boss.

[0012] Furthermore, the inner wall of the magnetic yoke through hole is provided with an indented portion.

[0013] Furthermore, the radial portion of the magnetic yoke is provided with a notch for the insert to extend radially.

[0014] Furthermore, the notch is located at the junction of the radial and axial portions of the magnetic yoke, including a first notch and a second notch located on the left and right sides respectively.

[0015] Furthermore, the radial projections of both the first and second notches are in the shape of a "7".

[0016] Furthermore, a grounding insert is provided on the outer surface of the radial portion where the notch is located.

[0017] Furthermore, the insert includes a first insert and a second insert. The first insert includes a plate-shaped first main body portion for plugging into an external power source, a first transition plate bent to the left below the first main body portion, a first mounting portion bent downward behind the first transition plate, and a first crimping portion bent backward from the left side of the first mounting portion. The second insert includes a plate-shaped second main body portion for plugging into an external power source, a second transition plate bent to the right below the second main body portion, a second mounting portion bent downward behind the second transition plate, and a second crimping portion bent backward from the right side of the second mounting portion.

[0018] The more specific design and technical effects of this utility model are further explained in conjunction with the accompanying drawings in the specific embodiments. Attached Figure Description

[0019] Figure 1 This is an axial sectional view of the first embodiment of the solenoid valve of this utility model;

[0020] Figure 2 yes Figure 1 A magnified view of part A in the diagram;

[0021] Figure 3 yes Figure 1 A magnified view of part B in the diagram;

[0022] Figure 4 This is a three-dimensional structural diagram of the cap of this utility model.

[0023] Figure 5 This is an axial sectional view of the valve body and stator assembly of this utility model after they are connected.

[0024] Figure 6 This is a three-dimensional structural schematic diagram of the stator assembly of this utility model;

[0025] Figure 7 This is an axial sectional view of the stator assembly of this utility model;

[0026] Figure 8 This is a three-dimensional structural schematic diagram of the coil assembly of this utility model;

[0027] Figure 9 This is a three-dimensional structural diagram of the coil assembly before the mounting insert of this utility model;

[0028] Figure 10 This is a three-dimensional structural diagram of the first insert of this utility model;

[0029] Figure 11 This is a three-dimensional structural diagram of the second insert of this utility model;

[0030] Figure 12 This is an axial sectional view of the second embodiment of the solenoid valve of this utility model.

[0031] Figure 13 This is a three-dimensional structural schematic diagram of the second embodiment of the bottom valve seat of this utility model;

[0032] in:

[0033] 10-Stator assembly, 11-Stator cavity, 12-Mounting cavity, 30-Valve cover, 31-Inlet, 32-Outlet, 33-Axial water passage hole, 40-Bottom valve seat, 41-Bottom valve seat body, 42-Flange, 43-Valve seat boss, 44-Valve seat through hole, 45-First groove, 50-Moving iron core, 51-Mounting through hole, 60-Metal ring, 70-Baffle, 71-First plug, 72-Elastic element, 80-Reset spring, 81-First spring, 82-Second spring, 90-Pressure cap, 91-Valve cover boss, 100-Coil assembly, 110-Coil frame, 120-Enameled wire, 130-Magnetic yoke 131-Radial portion, 132-Axial portion, 133-Magnetic yoke through hole, 134-First notch, 135-Second notch, 136-Recessed portion, 140-Grounding insert, 200-Stator housing, 310-First insert, 311-First main body, 312-First transition plate, 313-First mounting portion, 314-First crimping portion, 320-Second insert, 321-Second main body, 322-Second transition plate, 323-Second mounting portion, 324-Second crimping portion, 400-Valve body, 410-Valve body main body, 420-Protruding edge, 430-Valve body groove, 440-Valve body connecting portion Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Example 1:

[0036] See Figure 1 and Figures 5 to 8This utility model also discloses an improved solenoid valve with an improved valve body structure. The solenoid valve includes a stator assembly 10, a valve cover 30, a bottom valve seat 40, a moving iron core 50, a metal ring 60, a first plug 71, a first spring 81, a return spring 80, and a valve body 400. The stator assembly 10 includes a coil assembly 100 and a stator housing 200. The coil assembly 100 includes a hollow cylindrical coil frame 110, enameled wire 120 wound on the coil frame 110, inserts fixed to the coil frame 110, and a magnetic yoke 130 disposed on the outside of the coil frame 110. The magnetic yoke 130 includes a plate-shaped radial portion 131 and an axial portion 132 connected to the radial portion 131. The radial portion 132 has a magnetic yoke through hole 133 communicating with the hollow space of the coil frame 110. The stator housing 200 is molded onto the coil assembly 100, and its connection with the coil assembly 100 is described above. The axial portion 132 of the magnetic yoke and the coil frame 110 form a stator cavity 11. The enameled wire 120, the connection between the enameled wire 120 and the insert, and the radial portion 132 of the magnetic yoke are accommodated in the stator cavity 11. Preferably, the stator housing 200 of this utility model is injection molded onto the coil assembly 100. Of course, as in other embodiments, the stator housing 200 can also be compressed onto the coil assembly 100. The valve body 400 is injection molded onto the stator assembly 100. It includes a valve body main body 410 covering the hollow radial inner wall surface of the coil frame 110 and a valve body connecting portion 440 extending axially from one end of the coil frame 110. The center of the valve body main body 410 is provided with an axially penetrating mounting cavity 12. The valve cover 30 is provided with an inlet 31, an outlet 32, and an axially arranged axial water passage hole 33. The axial water passage hole 33 communicates with the outlet 32. The valve cover 30 of this invention is installed on one axial side of the valve body 400, and the bottom valve seat 40 is a plastic columnar body installed on the other axial side of the valve body 400. A metal ring 60 is fixedly mounted on the bottom valve seat 40. The moving iron core 50 is installed in the mounting cavity 12 and located between the valve cover 30 and the bottom valve seat 40. A first plug 71 is axially installed between the axial water passage hole 33 of the valve cover 30 and the moving iron core 50. A first spring 81 is axially installed between the moving iron core 50 and the first plug 71. A return spring 80 is sleeved on the radially outer side of the moving iron core 50. Alternatively, in other embodiments, the axial water passage hole 33 of the valve cover 30 can be designed to communicate with the inlet 31, and the return spring 80 can be located between the bottom valve seat 40 and the moving iron core 50. The optimized solenoid valve exhibits stable and reliable connections between its components, facilitating weight reduction.

[0037] See Figure 1In this invention, the inlet 31 of the valve cover 30 of the solenoid valve is parallel to the axis of its outlet 32, and the extension direction of the prongs exposed outside the stator housing 200 is the same as the outward extension direction of the inlet 31. Of course, in other embodiments, the axes of the inlet 31 and the outlet 32 ​​may overlap, or the extension direction of the prongs exposed outside the stator housing 200 may be the same as the outward extension direction of the outlet 32. The space occupied by the outer contour of the solenoid valve after this design facilitates miniaturization of the solenoid valve.

[0038] See Figure 1 and Figure 2 To reduce the overall axial dimension of the solenoid valve and further miniaturize it, the moving iron core 50 of this invention has a through mounting hole 51 in the axial direction. After installation, the first plug 71 and the first spring 81 are located on the axial side of the mounting hole 51 near the valve cover 30.

[0039] See Figures 3 to 5 The solenoid valve of this invention also includes a pressure cap 90 axially disposed on the side of the valve body 400 away from the valve cover 300. Specifically, the bottom valve seat 40 includes a columnar bottom valve seat body 41, a flange 42 protruding radially outward from the outer wall surface of the bottom valve seat body 41 axially away from the valve cover 30, and a first groove 45 disposed on the end face of the bottom valve seat body 41 facing the moving iron core 50. The pressure cap 90 of this invention is welded to the flange 420 of the valve body 400. After welding, the pressure cap 90 presses tightly against the flange 42 to fix the bottom valve seat 40 to the valve body 40. The solenoid valve designed in the above way can prevent the bottom valve seat 40 from falling out of the valve body 400, thereby improving the overall stability of the solenoid valve. Furthermore, in order to reduce the flash generated after welding the gland 90 and improve the welding quality of the gland 90, the flange 42 of the valve body 400 is also provided with a recessed valve body groove 430 facing the axial end face of the gland 90. The axial cross section of the valve body groove 430 is trapezoidal. The gland 90 has a valve cover boss 91 protruding from the axial end face of the valve body 20. After the gland 90 is welded, the valve cover boss 91 is inserted into the valve body groove 23.

[0040] See Figure 1 and Figure 2To reduce the direct impact between the moving valve core 50 and the bottom valve seat 40, which could damage the bottom valve seat 40, the solenoid valve of this invention also includes a second spring 82 and an elastic element 72 disposed within the mounting through hole 51. A valve seat boss 43 protrudes from the axial end face of the bottom valve seat body 41 facing the moving iron core 50, and this valve seat boss 43 is disposed opposite to the elastic element 72. Preferably, the elastic element 72 is a rubber columnar body. Furthermore, to facilitate the machining of the moving iron core 50 while preventing axial misalignment of the first spring 81 and the second spring 82 during operation, thus improving the stability of the solenoid valve, the solenoid valve of this invention also includes a gasket 70 installed within the mounting through hole 51 and axially disposed between the first spring 81 and the second spring 82.

[0041] See Figure 9 The magnetic yoke 130 of this invention has an inner wall with a recessed portion 136 formed by the magnetic yoke through hole 133. This design can enhance the connection strength between the stator assembly 10 and the valve body 400, and further improve the stability of the stator assembly 10 and the valve body 400.

[0042] See Figure 8 and Figure 9 The stator assembly 100 of this invention also has a notch on the magnetic yoke 130 for the inserts to pass through. This design can make full use of the radial space of the coil frame 110, solving the problems of large radial space occupied by the stator assembly 10 due to the need to occupy additional assembly space to avoid the magnetic yoke 130 during insert assembly, and large overall radial thickness required for the stator housing 200 to simultaneously wrap the weld joints of the inserts and enameled wires and the magnetic yoke. This is beneficial for achieving a lightweight stator assembly 10 while reducing its volume.

[0043] Furthermore, see Figure 8 and Figure 9 The notches in the magnetic yoke 130 of this invention are located at the junction of the radial portion 131 and the axial portion 132 of the magnetic yoke, including a first notch 134 on the left and a second notch 135 on the right. This design reduces the risk of leakage caused by the insert tipping over and contacting the magnetic yoke 130 during the molding of the stator housing 200, thus improving the yield rate of stator assembly production. Furthermore, to facilitate the cutting of the enameled wire 120 by the magnetic yoke 130 during entry and exit, the radial projections of the first notch 134 and the second notch 135 are both in the shape of a "7".

[0044] See Figure 8The stator assembly 10 of this invention also includes a grounding insert 140, which is fixed to the outer surface of the radial portion 131 of the magnetic yoke where the notch is located. This design reduces the size of the solenoid valve while preventing leakage of the stator assembly. Specifically, the radial portion 131 of the magnetic yoke 130 through which the insert passes is provided with a magnetic yoke mounting hole, and the grounding insert 140 is fitted onto the radial portion 131 by screws inserted into the magnetic yoke mounting hole.

[0045] See Figure 8 , Figure 10 and Figure 11 The insert of this utility model includes a first insert 310 and a second insert 320. Specifically, the first insert 310 is located on the side of the first notch 134 of the magnetic yoke 130, and the second insert 320 is located on the side of the second notch 135 of the magnetic yoke 130. Figure 5 and Figure 6 The first insert 310 includes a plate-shaped first main body 311 for plugging into an external power source, a first transition plate 312 bent to the left below the first main body 311, a first mounting portion 313 bent downward behind the first transition plate 312, and a first crimping portion 314 bent backward from the left side of the first mounting portion 313. The second insert 320 includes a plate-shaped second main body 321 for plugging into an external power source, a second transition plate 322 bent to the right below the second main body 321, a second mounting portion 323 bent downward behind the second transition plate 322, and a second crimping portion 324 bent backward from the right side of the second mounting portion 323. This design reduces the space occupied by the coil assembly 10 while facilitating automated connection between the enameled wire and the insert.

[0046] Example 2:

[0047] The difference between the solenoid valve in this embodiment and the solenoid valve in Example 1 is that, except for the different structure of the bottom valve seat 40, all other parts are the same as those in Example 1, and will not be described again here.

[0048] See Figure 12 and Figure 13 The bottom valve seat 40 of this invention also has a through valve seat hole 44 in the axial direction. This through valve seat hole 44 passes through both the bottom valve seat body 41 and the valve seat boss 43. After the solenoid valve is assembled, the through valve seat hole 44 and the elastic member 72 are axially facing each other. The solenoid valve designed as described above can selectively discharge liquid entering the valve body to the outlet 32 ​​or to the valve seat hole 44 of the bottom valve seat, allowing the solenoid valve to perform water separation function while also achieving a lightweight design.

Claims

1. An improved solenoid valve with an improved valve body structure, comprising a stator assembly (10) and a valve body (400), wherein the stator assembly (10) comprises a coil assembly (100) and a stator housing (200), the coil assembly (100) comprises a coil frame (110), enameled wire (120), inserts fixed on the coil frame (110), and a magnetic yoke (130) disposed outside the coil frame (110), wherein the magnetic yoke (130) comprises a plate-shaped radial portion (131) and an axial portion (132) connected to the radial portion (131) and provided with a through magnetic yoke through hole (133), characterized in that: The stator housing (200) is molded on the coil assembly (100), and together with the axial portion (132) of the magnetic yoke and the coil frame (110), it forms a stator cavity (11). The enameled wire (120), the connection between the enameled wire (120) and the insert, and the radial portion (131) of the magnetic yoke are housed in the stator cavity (11). The valve body (400) is injection molded into the inner cavity of the stator assembly (10), including a valve body main body (410) covering the radial inner wall surface of the coil frame (110) and a valve body connecting portion (440) extending axially at one end of the coil frame (110). The center of the valve body (400) is provided with an axially penetrating mounting cavity (12).

2. The solenoid valve with the improved valve body structure according to claim 1, characterized in that: It also includes a valve cover (30) fixedly connected to the valve body connection part (440), the valve cover (30) having an inlet (31) and an outlet (32) with parallel or overlapping axes, the extension direction of the portion of the insert exposed outside the stator housing (200) is the same as the extension direction of the inlet (31) or the outlet (32).

3. The solenoid valve with the improved valve body structure according to claim 1 or 2, characterized in that: It also includes a metal ring (60) and a columnar bottom valve seat (40) inserted into the mounting cavity (12) of the valve body (400) on the other side of the axial direction. The bottom valve seat (40) has an annular first groove (45) at one end facing the valve cover (30), and the metal ring (60) is fixed in the first groove (45).

4. The solenoid valve with the improved valve body structure according to claim 3, characterized in that: It also includes a pressure cap (90), and the bottom valve seat (40) has an annular flange (42) that protrudes radially outward from the end opposite to the valve cover (30). The pressure cap (90) presses the flange (42) to fix the bottom valve seat (40) onto the valve body (400).

5. The solenoid valve with the improved valve body structure according to claim 4, characterized in that: The valve body (400) has a recessed end face facing the pressure cap (90) to form a valve body groove (430) with a trapezoidal axial cross section. The end face of the pressure cap (90) facing the valve body (20) is provided with an annular valve cover boss (91). The pressure cap (90) is inserted into the valve body groove (430) through the valve cover boss (91) and welded to the valve body (400).

6. The solenoid valve with the improved valve body structure according to claim 3, characterized in that: It also includes a moving iron core (50) mounted on the valve body (400) and a return spring (80) sleeved on the radially outer side of the moving iron core (50). The moving iron core (50) is provided with an axially penetrating mounting through hole (51). The mounting through hole (51) is provided with an elastic element (72), a second spring (82), a baffle (70), a first spring (81), and a first plug (71) in sequence from one end adjacent to the bottom valve seat (40).

7. The solenoid valve with the improved valve body structure according to claim 6, characterized in that: The bottom valve seat (40) has a valve seat boss (43) protruding on the axial end face facing the moving iron core (50). The bottom valve seat (40) has an axially penetrating valve seat through hole (44) at its center. The elastic element (72) is arranged opposite to the valve seat boss (43).

8. The solenoid valve with an improved valve body structure according to claim 1 or 2, characterized in that: The inner wall of the magnetic yoke through hole (133) is provided with an indented recess (136).

9. The solenoid valve with an improved valve body structure according to claim 1 or 2, characterized in that: The radial portion (131) of the magnetic yoke (130) is provided with a notch for the insert to extend radially.

10. The solenoid valve with improved valve body structure according to claim 9, characterized in that: The notch is located at the junction of the radial portion (131) and the axial portion (132) of the magnetic yoke, including a first notch (134) and a second notch (135) located on the left and right sides respectively.

11. The solenoid valve with improved valve body structure according to claim 10, characterized in that: The radial projections of the first notch (134) and the second notch (135) are both in the shape of a "7".

12. The solenoid valve with improved valve body structure according to claim 9, characterized in that: The outer surface of the radial portion (131) where the notch is located is also provided with a grounding insert (140).

13. The solenoid valve with improved valve body structure according to claim 9, characterized in that: The insert includes a first insert (310) and a second insert (320). The first insert (310) includes a plate-shaped first main body (311) for plugging into an external power source, a first transition plate (312) bent to the left below the first main body (311), a first mounting portion (313) bent downward behind the first transition plate (312), and a first crimping portion (314) bent backward from the left side of the first mounting portion (313). The second insert (320) includes a plate-shaped second main body (321) for plugging into an external power source, a second transition plate (322) bent to the right below the second main body (321), a second mounting portion (323) bent downward behind the second transition plate (322), and a second crimping portion (324) bent backward from the right side of the second mounting portion (323).

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