Normally closed solenoid valve

Abstract

The normally closed solenoid valve disclosed in the present invention includes a valve body and an electromagnetic switch structure. The valve body is provided with a first fluid channel and a second fluid channel connected through a valve port. The electromagnetic switch structure includes a skeleton wound with a winding, a magnetic conductor, a static iron core and a moving iron core. The skeleton is provided with an intermediate channel. A first ring sleeve is provided at the bottom of the skeleton. The first ring sleeve and the intermediate channel form a first step, and the first step includes a first abutting portion; the static iron core is fixedly arranged at the relatively upper end of the intermediate channel, and the moving iron core is movably arranged at the relatively lower end of the intermediate channel; a second step is provided on the bottom side of the moving iron core, and the second step includes a second abutting portion. A spring is provided on the outer sleeve of the lower end portion of the moving iron core, and the two ends of the spring abut against the first abutting portion and the second abutting portion respectively; an upper limit abutting portion corresponding to the first abutting portion or the bottom end of the first ring sleeve is provided on the side of the moving iron core. When the upper limit abutting portion abuts against the first abutting portion or the bottom end of the first ring sleeve, there is a spacing between the moving iron core and the static iron core.

Description

Technical Field

[0001] The invention relates to the technical field of electric control valves, in particular to a normally closed solenoid valve. Background Art

[0002] like Figure 1 As shown, in a background technology, a normally closed solenoid valve includes a valve body 610, a magnetic conductor 600, a static iron core 220, a spring 500, a gasket 400, a moving iron core 300, and a sealing gasket 320 at the bottom of the moving iron core 300. The two ends of the spring respectively abut against the lower end of the static iron core and the upper end of the moving iron core. The gasket is fixed to the upper end of the moving iron core. Under normal conditions, the sealing gasket abuts against the valve port to close the valve port. When the coil is energized, the moving iron core moves upward to compress the spring and the sealing gasket moves away from the valve port, so that the valve port is in an open state. At this time, the moving iron core moves upward, and the gasket can prevent the moving iron core from being completely attracted to the static iron core when power is turned on. Summary of the invention

[0003] The object of the present invention is to provide a normally closed solenoid valve, comprising a valve body and an electromagnetic switch structure, wherein the valve body is provided with a first fluid channel and a second fluid channel, the first fluid channel and the second fluid channel are connected through a valve port, and the electromagnetic switch structure controls the opening and closing of the valve port;

[0004] The electromagnetic switch structure includes a frame, a magnetic conductor, a static iron core and a moving iron core, the frame is wound with a winding, the frame is provided with a vertically penetrating middle channel, a first ring sleeve is provided at the bottom of the frame, the inner diameter of the first ring sleeve is larger than the aperture of the middle channel, a first step is formed between the first ring sleeve and the hole wall of the middle channel, and the first step includes a first abutting portion;

[0005] The static iron core is fixedly arranged at the relatively upper end of the middle channel, and the moving iron core is arranged at the relatively lower end of the middle channel so as to be movable up and down along the middle channel, and the bottom end surface of the moving iron core corresponds to the valve port; a second step is arranged on the bottom side surface of the moving iron core, and a spring is arranged on the outer sleeve of the lower end portion of the moving iron core, and the two ends of the spring are respectively in contact with the first step and the second step;

[0006] An upper limit abutment portion corresponding to the first abutment portion or the bottom end of the first ring sleeve is provided on the side of the moving iron core. When the upper limit abutment portion abuts against the first abutment portion or the bottom end of the first ring sleeve, there is a distance between the moving iron core and the static iron core.

[0007] The normally closed solenoid valve designed in the present invention has a relatively large cross-sectional area of ​​the magnetic circuit by arranging a spring component between the moving iron core and the frame, and the magnetic conductivity of the solenoid valve is relatively improved; the upper limit step cooperates with the first step or the bottom end of the first ring sleeve to play the role of an upper limit, and the moving iron core and the static iron core are relatively easy to separate after the solenoid valve is powered off. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the background technology structure.

[0009] Figure 2 It is a schematic diagram of the overall structure of Example 1.

[0010] Figure 3 It is a partial enlarged schematic diagram of A in Example 1.

[0011] Figure 4 It is a partial enlarged schematic diagram of B in Example 1.

[0012] Figure 5 It is a structural schematic diagram of the valve body in Example 1.

[0013] Figure 6 It is a schematic diagram of the structure of the moving iron core in Example 1.

[0014] Figure 7 It is a schematic diagram of the structure of the skeleton in Example 1 (I).

[0015] Figure 8 It is a structural schematic diagram of the skeleton in Example 1 (II).

[0016] Fig. 9 It is a schematic diagram of the overall structure of Example 2.

[0017] Fig.10 It is a partially enlarged schematic diagram of C in Example 2.

[0018] Fig.11 It is a schematic diagram of the structure of the moving iron core in Example 2.

[0019] Fig.12 It is a schematic diagram of the overall structure of Example 3.

[0020] Fig.13 It is a schematic diagram of the structure of the moving iron core in Example 3.

[0021] Fig.14 Embodiment 4 is a schematic diagram of the overall structure.

[0022] Fig.15 It is a partial enlarged schematic diagram of D in Example 4.

[0023] Fig.16 It is a schematic diagram of the structure of the moving iron core in Example 4. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 2-8 As shown, the normally closed solenoid valve described in this embodiment includes a valve body 1 and an electromagnetic switch structure, wherein the valve body 1 is provided with a first fluid channel 11 and a second fluid channel 12, the first fluid channel 11 and the second fluid channel 12 are connected through a valve port 13, and the valve body 1 is provided with a connecting ring groove 14 for sealing and fixing with the electromagnetic switch structure. In this embodiment, the first fluid channel 11 can be used as a water inlet, and the second fluid channel 12 can be used as a water outlet. When the valve port 13 is in an open state, the fluid can enter from the first fluid channel 11, and flow out from the second fluid channel 12 after passing through the valve port 13.

[0027] The electromagnetic switch structure is used to control the opening and closing of the valve port 13. The electromagnetic switch structure includes a frame 2, a winding 4, a magnetic conductor 3, a static iron core 5 and a moving iron core 6. The frame 2 can usually be made of an injection molded part and wound with the winding 4. Then, an encapsulation layer 10 is formed on the outside of the frame 2 and the winding 4 by encapsulation to prevent liquid from entering. A vertically penetrating middle channel 21 is provided in the approximate middle of the frame 2. A first ring sleeve 22 is provided at the relative bottom of the frame 2 and relatively close to the middle channel 21, that is, the first ring sleeve 22 is in the shape of a protruding annular boss relative to the bottom of the frame 2. The inner diameter of the first ring sleeve 22 is larger than the aperture of the middle channel 21, so that a first step is formed between the first ring sleeve 22 and the hole wall of the middle channel 21, and the first step has a first abutment portion 23; a second ring sleeve 24 is arranged at the relative bottom of the skeleton 2 and relatively far from the middle channel 21, and the second ring sleeve 24 is located at the relative outside of the first ring sleeve 22, that is, the second ring sleeve 24 is also in the shape of a protruding annular boss relative to the bottom of the skeleton 2. The second ring sleeve 24 matches the connecting ring groove 14 provided in the valve body 1. Specifically, the second ring sleeve 24 can be inserted into the connecting ring groove 14, and a first sealing ring 7 is arranged in the connecting ring groove 14. During assembly, flange structures (not shown in the figure) can be respectively arranged on the magnetizer 3 and the valve body, and connected by screws. In this way, the skeleton 2 and the valve body 1 are sealed and connected through the magnetizer 3.

[0028] by Figure 2As a reference, the longitudinal section of the magnetizer 3 in this embodiment is roughly C-shaped, including an upper transverse portion 31 and a lower transverse portion 32. The upper transverse portion 31 and the lower transverse portion 32 are roughly plate-like structures, wherein the lower transverse portion 32 is provided with a notch, and correspondingly, the outer edge portion of the relative lower end of the skeleton 2 is provided with a fixing annular groove 26, and the lower transverse portion 32 is inserted into the fixing annular groove 26 of the skeleton 2 through the notch to achieve relative fixation between the magnetizer 3 and the skeleton 2. The static iron core 5 is arranged at the relative upper end of the skeleton middle channel 21; specifically, a positioning step 51 is provided laterally at the top of the static iron core 5, and the skeleton 2 is provided with an annular step 25 matching the positioning step 51 at the outer edge portion near the top of the middle channel 21, and a second sealing ring 8 is provided between the positioning step 51 and the annular step 25, and the top of the static iron core 5 abuts against the upper transverse portion 21 of the magnetizer 3, so that the static iron core 5 is limitedly set at the relative upper end of the middle channel 21.

[0029] The moving iron core 6 is arranged at the lower end of the middle channel 21 and can move up and down along the middle channel 21. During the moving stroke of the moving iron core 6, at least part of the moving iron core is located in the middle channel 21. The bottom end surface of the moving iron core 6 corresponds to the valve port 13. The valve port 13 is opened or closed by the up and down movement of the moving iron core 6. In this embodiment, a groove 63 is provided on the bottom end surface of the moving iron core 6. A sealing gasket 65 is fixed or limitedly arranged in the groove 63. In this way, when the moving iron core 6 moves up and down, it can drive the sealing gasket 65 to move together, and the sealing gasket 65 can achieve the blocking of the valve port 13. As a more specific embodiment, the groove 63 has a notch side wall protruding with a limiting ring body 64, a sealing gasket 65 is provided in the groove 63, and a convex ring 66 is provided on the circumferential side wall of the sealing gasket 65. The sealing gasket 65 is limited and embedded in the groove 63 by the convex ring 66 and the limiting ring body 64; the sealing gasket 65 blocks or opens the valve port 13 by moving the moving iron core 6 up and down. The sealing gasket 65 can improve the reliability of the moving iron core 6 blocking the valve port 13, and this structure makes the installation of the sealing gasket 65 more convenient and the fixation more firm and reliable. Of course, other fixing methods or limiting methods can be used between the sealing gasket 65 and the groove 63. This embodiment is only described as an example and does not mean to limit the fixing or limiting methods of the two. In addition, the groove 63 and the sealing gasket 65 can also be omitted, and the bottom of the moving iron core 6 can be set as a plane to directly block the valve port 13.

[0030] In this embodiment, a second step is provided on the bottom side of the moving iron core 6, and the second step has a second abutment portion 61. A spring 9 is sleeved on the outer side of the lower end of the moving iron core 6, and the two ends of the spring 9 abut against the first abutment portion 23 and the second abutment portion 61 respectively; an upper limit step 62 is provided on the circumferential outer side of the moving iron core 6, and the upper limit step 62 is located above the second step. The radial dimension of the upper limit step 62 is slightly larger than the inner diameter dimension of the middle channel 21. At this time, the upper surface of the upper limit step 62 is an upper limit abutment portion 621, and the upper limit abutment portion 621 corresponds to the first abutment portion 23 of the first step in the longitudinal direction, and the distance between the upper limit abutment portion 621 and the first abutment portion 23 is smaller than the distance h between the moving iron core 6 and the static iron core 5. Figure 4 The spacing h shown is Figure 2 , Figure 3 The normally closed solenoid valve shown in the figure is in the closed state. When the normally closed solenoid valve is opened, as the moving iron core moves upward, the spacing h will gradually shorten, but it is always greater than the spacing between the upper limit abutment portion 621 and the first abutment portion 23. When the moving iron core 6 moves upward to the limit position, the upper limit abutment portion 621 abuts against the first abutment portion 23. At this time, there is still a spacing between the moving iron core 6 and the static iron core 5, which avoids the phenomenon that the moving iron core 6 and the static iron core 5 are completely attracted when the power is on and cannot be disengaged when the power is off. In this structure, no other components are directly set between the moving iron core 6 and the static iron core 5 to prevent the two from contacting, and the cross-sectional area of ​​the magnetic circuit is relatively large, so that the magnetic conductivity of the solenoid valve can also be guaranteed.

[0031] During the implementation of this embodiment, when the winding 4 wound around the skeleton 2 is energized to generate electromagnetic force, the moving iron core 6 overcomes the elastic force of the spring 9 and moves upward, and the sealing gasket 65 at the bottom end of the moving iron core 6 is separated from the valve port 13, so that the first fluid channel 11 and the second fluid channel 12 are connected; when the power is off, the electromagnetic force disappears, the moving iron core 6 is reset under the action of the spring 9, and the sealing gasket 65 at the bottom end of the moving iron core 6 blocks the valve port 13, thereby blocking the first fluid channel 11 and the second fluid channel 12.

[0032] In the present embodiment, there will be liquid in the middle channel 21 of the skeleton 2. When the moving iron core 6 moves upward, if the liquid in the middle channel 21 cannot be discharged quickly, the liquid pressure in the gap between the moving iron core 6 and the static iron core 5 will make it difficult for the moving iron core 6 to move upward, and it may even be impossible to move upward. Therefore, a plurality of through grooves 27 are provided on the circumferential side of the first ring sleeve 22. The through grooves 27 penetrate the circumferential wall of the first ring sleeve 22, so that when the moving iron core 6 moves upward, the liquid in the middle channel 21 can be quickly discharged from the through grooves 27, thereby achieving the technical effect of smooth upward movement of the moving iron core 6.

[0033] In this embodiment, the first fluid channel 11 and the second fluid channel 12 are both installed with a pipe claw 16 through a joint 15, and a third sealing ring 17 is provided between the first fluid channel 11 or the second fluid channel 12 and the joint 15. Its structure makes it more convenient to seal and connect the first fluid channel 11 and the second fluid channel 12 with the water inlet pipe and the water outlet pipe respectively, and the connection is fixed, stable and reliable.

[0034] Example 2

[0035] like Figure 9-11 As shown, the difference between the normally closed solenoid valve described in this embodiment and embodiment 1 is that in this embodiment, an elastic washer 622 is provided on the upper limit step 62. In this embodiment, the cross section of the elastic washer 622 is rectangular, and the upper surface of the elastic washer 622 is the upper limit abutment portion 621. If the cross section of the elastic washer is circular, the top of the annular elastic washer is the upper limit abutment portion 621. The upper limit abutment portion 621 corresponds to the first abutment portion 23 of the first step in the longitudinal direction, and the spacing between the upper limit abutment portion 621 and the first abutment portion 23 is smaller than the spacing h between the moving iron core 6 and the static iron core 5. When the moving iron core 6 moves upward to the limit position, the upper limit abutment portion 621 abuts against the first abutment portion 23. At this time, there is still a spacing between the moving iron core 6 and the static iron core 5, which avoids the phenomenon that the moving iron core 6 and the static iron core 5 are completely attracted when the power is on, and cannot be disengaged when the power is off. Specifically, a slot 623 is provided on the outer wall of the moving iron core 6, and the slot 623 is located above the upper limit step 62, and an elastic gasket 622 is sleeved in the slot 623; the presence of the elastic gasket 622 enables the upper limit abutment portion 621 to elastically contact with the first abutment portion 23 when the moving iron core 6 moves to the extreme position, thereby achieving a silent effect.

[0036] Example 3

[0037] like Fig.12 , 13As shown, the difference between the normally closed solenoid valve described in this embodiment and embodiment 2 is that the moving iron core 6 in this embodiment adopts an upper and lower split design, including a first moving iron core part 6a and a second moving iron core part 6b, and the first moving iron core part 6a and the second moving iron core part 6b can be processed separately, and then assembled and fixed to form a moving iron core. Specifically, the dividing line on the circumferential side of the moving iron core 6 is the upper wall of the slot 623, that is, the first moving iron core part 6a is columnar, and the top of the first moving iron core part 6b is stepped, and the slot 623 is formed at the connection when the upper and lower parts are connected together; wherein the bottom of the first moving iron core part 6a is provided with a threaded rod 67, and the first moving iron core part 6b is provided with a threaded hole 68 matching the threaded rod 67, and the first moving iron core part 6a and the first moving iron core part 6b are fixedly connected together by the cooperation of the threaded rod 67 and the threaded hole 68. The above is an exemplary description of the split production and assembly of the moving iron core. Inspired by this embodiment, those skilled in the art can make many equivalent alternatives to achieve the split production of the first moving iron core part 6a and the second moving iron core part 6b and then fix them into the moving iron core, such as by welding, riveting, etc. to achieve fixed connection. These equivalent alternatives also fall within the scope of protection of the present invention. Since the moving iron core 6 has a small size, the split design can facilitate the manufacturing and processing of the moving iron core 6.

[0038] In addition, in this embodiment, the bottom end surface of the moving iron core 6 is in rigid contact with the valve port 13, that is, the bottom end surface of the moving iron core 6 is a horizontal plane, which directly blocks the valve port 13 without grooving or setting a sealing gasket, further simplifying the processing technology of the moving iron core 6.

[0039] Example 4

[0040] like Figure 14-16 As shown, the difference between the normally closed solenoid valve described in this embodiment and embodiment 1 is that, in this embodiment, the radial dimension of the second step is increased so that the radial dimension of the second step is slightly larger than the inner diameter dimension of the first ring sleeve 22, so that the second abutment portion 61 of the second step and the bottom end of the first ring sleeve 22 correspond to each other in the longitudinal direction, and the distance between the second abutment portion 61 and the bottom end of the first ring sleeve 22 is smaller than the distance h between the moving iron core 6 and the static iron core 5. At this time, the second abutment portion 61 of the second step is the upper limit abutment portion, that is, the upward movement limit of the moving iron core 6 is achieved by utilizing the mutual cooperation between the second abutment portion 61 and the bottom end of the first ring sleeve 22. When the moving iron core 6 moves upward to the limit position, the second abutment portion 61 abuts against the end face of the bottom end of the first ring sleeve 22. At this time, there is still a distance between the moving iron core 6 and the static iron core 5, which avoids the phenomenon that the moving iron core 6 and the static iron core 5 are completely attracted when power is on and cannot be disengaged when power is off.

[0041] In the present embodiment, when manufacturing the moving iron core 6 , there is no need to machine an additional step for upper limit on the side of the moving iron core 6 , which facilitates the processing of the moving iron core.

[0042] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A normally closed solenoid valve, comprising a valve body and an electromagnetic switch structure, wherein the valve body is provided with a first fluid channel and a second fluid channel, the first fluid channel and the second fluid channel are connected through a valve port, and the electromagnetic switch structure controls the opening and closing of the valve port; Features: The electromagnetic switch structure includes a frame, a magnetic conductor, a static iron core and a moving iron core, the frame is wound with a winding, the frame is provided with a vertically penetrating middle channel, a first ring sleeve is provided at the bottom of the frame, the inner diameter of the first ring sleeve is larger than the aperture of the middle channel, a first step is formed between the first ring sleeve and the hole wall of the middle channel, and the first step includes a first abutting portion; The static iron core is fixedly arranged at the relatively upper end of the middle channel, and the moving iron core is arranged at the relatively lower end of the middle channel so as to be movable up and down along the middle channel, and the bottom end surface of the moving iron core corresponds to the valve port; a second step is arranged on the bottom side surface of the moving iron core, and the second step includes a second abutting portion, and a spring is arranged on the outer sleeve of the lower end portion of the moving iron core, and the two ends of the spring abut against the first abutting portion and the second abutting portion respectively; An upper limit abutment portion corresponding to the first abutment portion or the bottom end of the first ring sleeve is provided on the side of the moving iron core. When the upper limit abutment portion abuts against the first abutment portion or the bottom end of the first ring sleeve, there is a distance between the moving iron core and the static iron core.

2. The normally closed solenoid valve according to claim 1, Features: An upper limit step is provided on the circumferential side of the moving iron core, and the upper limit step is located above the second step. The upper limit abutment portion is the upper surface of the upper limit step, and the distance between the upper limit abutment portion and the first step is smaller than the distance between the moving iron core and the static iron core.

3. The normally closed solenoid valve according to claim 1, Features: An upper limit step is provided on the circumferential side of the moving iron core, and the upper limit step is located above the second step. The upper limit step is provided with an elastic washer, and the upper limit abutment portion is the upper surface or top of the elastic washer. The distance between the upper limit abutment portion and the first step is smaller than the distance between the moving iron core and the static iron core.

4. The normally closed solenoid valve according to claim 3, Features: A clamping groove is provided on the outer peripheral wall of the moving iron core. The clamping groove is located above the upper limit step. The elastic gasket is sleeved in the clamping groove.

5. The normally closed solenoid valve according to claim 4, Features: The moving iron core includes a first moving iron core part and a second moving iron core part, the first moving iron core part and the second moving iron core part are processed and formed respectively, a threaded rod is provided at the bottom of the first moving iron core part, and a threaded hole matching the threaded rod is provided at the second moving iron core part, and the first moving iron core part and the second moving iron core part are fixedly connected by threaded cooperation.

6. The normally closed solenoid valve according to claim 1, Features: The upper limit abutment portion is the second abutment portion, the upper limit abutment portion corresponds to the bottom end of the first ring sleeve, and the distance between the upper limit abutment portion and the bottom end of the first ring sleeve is smaller than the distance between the moving iron core and the static iron core.

7. The normally closed solenoid valve according to claim 1, Features: A groove is provided on the bottom end surface of the moving iron core, a limiting ring body is protruded on the side wall of the groove, a sealing gasket is provided in the groove, a convex ring is provided on the circumferential side wall of the sealing gasket, and the sealing gasket is fixedly embedded in the groove through the convex ring and the limiting ring body.

8. The normally closed solenoid valve according to claim 1, Features: A second ring sleeve is provided at the bottom of the skeleton, and the second ring sleeve is located on the relatively outer side of the first ring sleeve; the valve body is provided with a connecting ring groove matching the second ring sleeve, the second ring sleeve is inserted into the connecting ring groove, and a first sealing ring is provided between the second ring sleeve and the connecting ring groove.

9. The normally closed solenoid valve according to claim 1 or 8, Features: A plurality of through grooves are arranged on the peripheral side of the first ring sleeve, and the through grooves penetrate through the peripheral wall of the first ring sleeve.

10. The normally closed solenoid valve according to claim 1, Features: The magnetic conductor includes an upper transverse portion and a lower transverse portion, and the lower transverse portion of the magnetic conductor is clamped on the lower portion of the frame; a positioning step is provided on the side of the top of the static iron core, and an annular step matching the positioning step is provided on the top of the middle channel of the frame, and a second sealing ring is provided between the positioning step and the annular step, and the top of the static iron core is in contact with the upper transverse portion of the magnetic conductor.

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