Normally open solenoid valve

Abstract

The normally-open electromagnetic valve comprises a coil module, a valve body, a valve element assembly and a diaphragm, the valve body is fixedly connected to the coil module, and the valve body is provided with two channels; the valve element assembly comprises a fixed iron core, a movable iron core, a push rod and an elastic piece, the fixed iron core is at least partially fixedly installed in the coil module, the movable iron core is movably installed in the coil module, the push rod penetrates through the fixed iron core and is provided with an abutting-pushing part, the push rod is sleeved with the elastic piece, the elastic piece is connected with the fixed iron core and the abutting-pushing part in an abutting-against mode, and the elastic piece is connected with the movable iron core. The pushing part can be pressed and limited to the movable iron core under the pushing of the elastic piece; the diaphragm is installed between the valve body and the coil module and connected with the push rod so as to control connection / disconnection between the two channels under driving of the push rod. Therefore, the push rod and the movable iron core do not need to be provided with corresponding structures for connecting the push rod and the movable iron core, the structures of the push rod and the movable iron core can be simplified, and assembling of the normally-open electromagnetic valve is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field related to electromagnetic valves, and particularly relates to a normally open electromagnetic valve. Background Art

[0002] Solenoid valves are industrial equipment controlled by electromagnetics and are basic automation components used to control fluids. Solenoid valves are divided into normally open solenoid valves and normally closed solenoid valves according to the control method. The characteristic of a normally open solenoid valve is that the solenoid valve is closed when the coil is energized and opens when the coil is de-energized. If the pipeline needs to be open for a long time and closed occasionally, a normally open solenoid valve should be selected.

[0003] At present, the existing normally open solenoid valve usually assembles the valve core spring between the fixed iron core and the movable iron core in a pre-stressed manner, and connects the diaphragm by fixing a support rod that penetrates the fixed iron core on the movable iron core, so that when the normally open solenoid valve is working, the support rod can drive the diaphragm to block the valve port of the normally open solenoid valve under the drive of the movable iron core, and achieve the purpose of controlling the normally open solenoid valve to close. However, since the support rod is fixedly connected to the movable iron core, the support rod and the movable iron core need to be provided with a matching structure in order to achieve the assembly connection between the two, which makes the structure of the support rod and the movable iron core complicated, and also increases the complexity of the overall assembly of the normally open solenoid valve. Utility Model Content

[0004] In view of this, it is necessary to provide a normally open solenoid valve for solving the above technical problems.

[0005] A normally open solenoid valve, the normally open solenoid valve comprising:

[0006] Coil module;

[0007] A valve body, fixedly connected to the coil module, the valve body having two channels;

[0008] A valve core assembly, comprising a fixed iron core, a movable iron core, a push rod and an elastic member, wherein the fixed iron core is at least partially fixedly installed in the coil module, the movable iron core is movably installed in the coil module, the push rod is arranged through the fixed iron core, wherein the push rod has a push portion, the elastic member is sleeved on the push rod and respectively abuts against the fixed iron core and the push portion, and the push portion can be pressed and limited to the movable iron core under the push of the elastic member;

[0009] A diaphragm is installed between the valve body and the coil module and connected to the push rod to control the on / off between the two channels under the drive of the push rod.

[0010] It can be understood that the push rod is pressed and limited to the movable iron core by an elastic member, that is, the push rod and the movable iron core are not connected to each other, so that the push rod and the movable iron core do not need to be configured with a corresponding structure for the connection between the two. In this way, the structure of the push rod and the movable iron core can be simplified, and the assembly of the normally open solenoid valve can be facilitated.

[0011] In one of the embodiments, a slot is provided on the movable iron core, the slot is matched with the push portion, and the push portion can be plugged into and matched with the slot.

[0012] It can be understood that the assembly positioning between the push rod and the movable iron core can be achieved by utilizing the plug-in fit between the push portion and the slot, thereby further facilitating the assembly of the normally open solenoid valve.

[0013] In one embodiment, a positioning center hole is further provided on the movable iron core, and the positioning center hole is symmetrical with respect to the center of the movable iron core and is connected to the slot;

[0014] Wherein, the movable iron core is formed with a step surface at a portion where the positioning center hole is connected to the slot, and the movable iron core can push the push rod through the step surface.

[0015] In one embodiment, the fixed iron core is disposed inside the coil module.

[0016] In one of the embodiments, an end surface of the fixed iron core away from the movable iron core is pressed against the diaphragm, and the fixed iron core can be pressed and limited into the coil module by the diaphragm.

[0017] It can be understood that the fixed iron core is pressed and limited into the coil module by the diaphragm, and the fixed iron core is assembled in the coil module, so that the fixed iron core can be easily assembled and fixed in the coil module.

[0018] In one embodiment, the coil module includes a frame, a winding coil and a magnetic conductor, and the magnetic conductor and the winding coil are both mounted on the frame;

[0019] Wherein, the valve body can press and limit the fixed iron core to the frame through the diaphragm.

[0020] In one embodiment, the fixed iron core includes a fixed iron core body and an outer ring body, wherein the outer ring body is arranged at the periphery of the fixed iron core body and is connected to the fixed iron core body as a whole;

[0021] Wherein, the outer ring body abuts against the frame and is pressed and limited by the diaphragm.

[0022] In one of the embodiments, a receiving cavity is formed between the diaphragm and the valve body, and the receiving cavity is respectively communicated with two channels on the valve body.

[0023] It can be understood that the accommodating cavity formed by the diaphragm and the valve body is used to connect the two channels of the valve body and isolate the conducting liquid of the normally open solenoid valve from the valve core assembly, thereby preventing the conducting liquid on the normally open solenoid valve from corroding the valve core assembly.

[0024] In one of the embodiments, a groove is formed on the fixed iron core, and the elastic member is partially disposed in the groove and abuts against the bottom of the groove.

[0025] In one of the embodiments, an annular boss is formed on the valve body, and the valve body can squeeze the diaphragm through the annular boss to cause elastic deformation, and the diaphragm and the valve body can be assembled and sealed.

[0026] It can be understood that the annular boss on the valve body is used to squeeze the diaphragm to cause elastic deformation, thereby improving the sealing performance of the assembly between the valve body and the diaphragm.

[0027] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0028] The normally open solenoid valve for which protection is sought in the present application uses an elastic member to press and limit the push rod to the movable iron core, that is, the push rod and the movable iron core are not connected to each other, so that the push rod and the movable iron core do not need to be configured with a corresponding structure for the connection between the two. In this way, the structure of the push rod and the movable iron core can be simplified, and the assembly of the normally open solenoid valve can be facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A cross-sectional view of a normally open solenoid valve provided in this application;

[0031] Figure 2 for Figure 1 Enlarged view of the middle P part.

[0032] : 100, normally open solenoid valve; 10, coil module; 11, skeleton; 12, winding coil; 13, magnetic conductor; 14, magnetic plate; 101, connector; 102, accommodating chamber; 20, valve body; 21, channel; 22, annular boss; 30, valve core assembly; 31, fixed iron core; 301, end face; 302, groove; 3021, groove bottom; 311, fixed iron core body; 312, outer ring body; 32, movable iron core; 321, slot; 322, center hole; 323, step surface; 33, push rod; 331, push portion; 34, elastic member; 40, diaphragm. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that when an element is referred to as being "provided on" another element, it may be directly provided on the other element or there may be a central element. When an element is considered to be "provided on" another element, it may be directly provided on the other element or there may be a central element at the same time. When an element is considered to be "fixed to" another element, it may be directly fixed to the other element or there may be a central element at the same time.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0036] The normally open solenoid valve 100 for which protection is sought in the present application specifically refers to a normally open solenoid valve used in electrical equipment.

[0037] like Figure 1As shown, a normally open solenoid valve 100 provided in an embodiment of the present application includes a coil module 10, a valve body 20, a valve core assembly 30 and a diaphragm 40. The valve body 20 is fixedly connected to the coil module 10, and the valve body 20 has two channels 21; the valve core assembly 30 includes a fixed iron core 31, a movable iron core 32, a push rod 33 and an elastic member 34. The fixed iron core 31 is at least partially fixedly installed in the coil module 10, and the movable iron core 32 is movably installed in the coil module 10. The push rod 33 is arranged through the fixed iron core 31, wherein the push rod 33 has a push portion 331, and the elastic member 34 is mounted on the push rod 33 and respectively abuts against the fixed iron core 31 and the push portion 331, and the push portion 331 can be pressed and limited to the movable iron core 32 under the push of the elastic member 34; the diaphragm 40 is installed between the valve body 20 and the coil module 10 and connected to the push rod 33, so as to control the on / off between the two channels 21 under the drive of the push rod 33. Here, the elastic member 34 is configured as a spring or a rubber sleeve with high elasticity.

[0038] It can be understood that the push rod 33 is pressed and limited to the movable iron core 32 by the elastic member 34, that is, the push rod 33 and the movable iron core 32 are not connected to each other, so that the push rod 33 and the movable iron core 32 do not need to be configured with a corresponding structure for the connection between the two. In this way, the structure of the push rod 33 and the movable iron core 32 can be simplified, and the assembly of the normally open solenoid valve 100 can be facilitated.

[0039] like Figure 1 As shown, the coil module 10 includes a frame 11, a winding coil 12 and a magnetic conductor 13, and the magnetic conductor 13 and the winding coil 12 are both mounted on the frame 11. Here, the winding coil 12 is mounted on the frame 11 and is limited by the magnetic conductor 13, wherein the magnetic conductor 13 can be specifically limited on the frame 11 by a magnetic plate 14.

[0040] like Figure 1 As shown, the valve body 20 abuts against the magnetic conductor 13 and is fixed with a connection piece 101 such as a screw or a bolt. Here, there are two connection pieces 101, which are arranged at diagonal positions of the valve body 20. Of course, the number of the connection pieces 101 can also be three, four, or even more, and the connection pieces 101 are arranged at intervals along the circumference of the valve body 20.

[0041] like Figure 1 As shown, a receiving cavity 102 is formed between the valve body 20 and the diaphragm 40, and the receiving cavity 102 is respectively communicated with two channels 21 on the valve body 20. In other words, the normally open solenoid valve 100 uses the receiving cavity 102 to conduct liquid, so that the liquid conducted by the normally open solenoid valve 100 is isolated from the valve core assembly 30, so that the liquid conducted on the normally open solenoid valve 100 can be prevented from corroding the valve core assembly 30.

[0042] like Figure 1 , Figure 2 As shown, an annular boss 22 is formed on the valve body 20, and the valve body 20 can squeeze the diaphragm 40 through the annular boss 22 to cause elastic deformation, and make the diaphragm 40 and the valve body 20 assembled and sealed, which can improve the sealing performance of the assembly between the valve body 20 and the diaphragm 40.

[0043] like Figure 1 As shown, the fixed core 31 is disposed inside the coil module 10. That is, the fixed core 31 is completely contained in the coil module 10. Here, the fixed core 31 is assembled to the frame 11 in a plug-in manner, and the portion of the fixed core 31 located outside the frame 11 can be surrounded by the magnetic conductor 13.

[0044] like Figure 1 As shown, an end face 301 of the fixed core 31 away from the movable core 32 is abutted against the diaphragm 40, and the fixed core 31 can be pressed and limited into the coil module 10 by the diaphragm 40. That is to say, when the fixed core 31 is assembled in the coil module 10, it can be fixed by pressing the diaphragm 40. Since the diaphragm 40 is pressed and fixed to the magnetic conductor 13 of the coil module 10 through the valve body 20, it is not necessary to adopt additional steps to achieve the fixing of the fixed core 31 when assembled in the coil module 10, which facilitates the assembly and fixing of the fixed core 31 in the coil module 10.

[0045] like Figure 2 As shown, the fixed core 31 includes a fixed core body 311 and an outer ring body 312, and the outer ring body 312 is arranged on the periphery of the fixed core body 311 and connected to the fixed core body 311 as a whole. Here, the outer ring body 312 abuts against the frame 11 and is pressed and limited by the diaphragm 40.

[0046] like Figure 2 As shown, a groove 302 is opened on the fixed iron core 31, and the elastic member 34 is arranged in the groove 302 and abuts against the groove bottom 3021 of the groove 302, so that there is enough space between the groove bottom 3021 of the groove 302 on the fixed iron core 31 and the abutting portion 331 of the push rod 33 to assemble the elastic member 34.

[0047] like Figure 2 As shown, a slot 321 is provided on the movable iron core 32, and the slot 321 matches the push portion 331, and the push portion 331 can be plugged and matched with the slot 321, so that the assembly positioning between the push rod 33 and the movable iron core 32 can be achieved, so that the subsequent assembly of the elastic member 34 and the fixed iron core 31 on the push rod 33 can be facilitated, thereby facilitating the assembly of the normally open solenoid valve 100. Here, the push portion 331 is configured as a square structure.

[0048] like Figure 2 As shown, a positioning center hole 322 is also opened on the movable iron core 32. The positioning center hole 322 is symmetrical with respect to the center of the movable iron core 32 and is connected to the slot 321, so that when the movable iron core 32 is processed with the slot 321, the positioning center hole 322 can be used as the positioning center for processing, which makes it easy to process the movable iron core 32 and obtain the slot 321.

[0049] like Figure 2 As shown, a step surface 323 is formed on the movable iron core 32 at a portion where the positioning center hole 322 communicates with the slot 321 , and the movable iron core 32 can push the push rod 33 through the step surface 323 .

[0050] As can be seen from the above, when the normally open solenoid valve 100 of the present application is working, when the winding coil 12 on the coil module 10 is powered off, the push rod 33 can drive the diaphragm 40 to release the blockage of one of the channels 21 on the valve body 20 under the elastic push of the elastic member 34, so that the two channels 21 on the valve body 20 are connected and the normally open solenoid valve 100 is in an open state; and when the winding coil 12 on the coil module 10 is energized, the movable iron core 32 generates a magnetic field after the winding coil 12 is energized, which drives the push rod 33 to move toward the fixed iron core 31, so that the diaphragm 40 is driven by the push rod 33 to descend and block one of the channels 21 on the valve body 20, and the two channels 21 on the valve body 20 are disconnected, that is, the normally open solenoid valve 100 is in a closed state.

[0051] It should be noted that when assembling the normally open solenoid valve 100 of the present application, the movable iron core 32, the push rod 33, the elastic member 34 and the fixed iron core 31 can be assembled to the coil module 10 in sequence, and then the diaphragm 40 can be assembled to the end of the push rod 33 extending out of the fixed iron core 31, and then the assembly connection between the valve body 20 and the magnetic conductor 13 on the coil module 10 can be used to press and limit the diaphragm 40 connected to the end of the fixed iron core 31 extending out of the push rod 33 to the magnetic conductor 13. At the same time, the fixed iron core 31 can be pressed and limited to the skeleton 11 of the coil module 10 by the diaphragm 40.

[0052] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection required by the present invention.

Claims

1. A normally open solenoid valve, characterized in that: The normally open solenoid valve (100) comprises: Coil module (10); A valve body (20) is fixedly connected to the coil module (10), and the valve body (20) has two channels (21); A valve core assembly (30), comprising a fixed iron core (31), a movable iron core (32), a push rod (33) and an elastic member (34), wherein the fixed iron core (31) is at least partially fixedly installed in the coil module (10), the movable iron core (32) is movably installed in the coil module (10), the push rod (33) is arranged to penetrate the fixed iron core (31), wherein the push rod (33) has a push portion (331), the elastic member (34) is mounted on the push rod (33) and respectively abuts against the fixed iron core (31) and the push portion (331), and the push portion (331) can be pressed and limited to the movable iron core (32) under the push of the elastic member (34); A diaphragm (40) is installed between the valve body (20) and the coil module (10) and connected to the push rod (33) to control the on / off between the two channels (21) under the drive of the push rod (33); The movable iron core (32) is provided with a slot (321), the slot (321) is matched with the push portion (331), and the push portion (331) can be plugged and matched with the slot (321); The movable iron core (32) is also provided with a positioning center hole (322), the positioning center hole (322) is symmetrical with respect to the center of the movable iron core (32) and is in communication with the slot (321); The movable iron core (32) is provided with a step surface (323) at a portion where the positioning center hole (322) and the slot (321) are connected, and the movable iron core (32) can push the push rod (33) through the step surface (323).

2. The normally open solenoid valve according to claim 1, characterized in that: The fixed iron core (31) is arranged inside the coil module (10).

3. The normally open solenoid valve according to claim 2, characterized in that: An end surface (301) of the fixed iron core (31) away from the movable iron core (32) is abutted against the diaphragm (40), and the fixed iron core (31) can be pressed and limited into the coil module (10) by the diaphragm (40).

4. The normally open solenoid valve according to claim 3, characterized in that: The coil module (10) comprises a frame (11), a winding coil (12) and a magnetic conductor (13), wherein the magnetic conductor (13) and the winding coil (12) are both mounted on the frame (11); The valve body (20) is capable of pressing and positioning the fixed iron core (31) onto the frame (11) via the diaphragm (40).

5. The normally open solenoid valve according to claim 4, characterized in that: The fixed iron core (31) comprises a fixed iron core body (311) and an outer ring body (312), wherein the outer ring body (312) is arranged at the periphery of the fixed iron core body (311) and is connected to the fixed iron core body (311) as a whole; The outer ring body (312) abuts against the frame (11) and is pressed and limited by the diaphragm (40).

6. The normally open solenoid valve according to claim 1, characterized in that: The diaphragm (40) and the valve body (20) together form an accommodating cavity (102), and the accommodating cavity (102) is respectively connected to two channels (21) on the valve body (20).

7. The normally open solenoid valve according to claim 1, characterized in that: The fixed iron core (31) is provided with a groove (302), and the elastic member (34) is partially disposed in the groove (302) and abuts against a groove bottom (3021) of the groove (302).

8. The normally open solenoid valve according to claim 1, characterized in that: An annular boss (22) is formed on the valve body (20), and the valve body (20) can squeeze the diaphragm (40) through the annular boss (22) to cause elastic deformation, and the diaphragm (40) and the valve body (20) are assembled and sealed.

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