CN111594652A

CN111594652A - Mute electromagnetic valve

Info

Publication number: CN111594652A
Application number: CN202010438819.1A
Authority: CN
Inventors: 唐亚平
Original assignee: Xiamen Rongji Precision Technology Co ltd
Current assignee: Tang Yaping
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2020-08-28

Abstract

The invention relates to a mute electromagnetic valve, which comprises a coil framework, a first permanent magnet, a second permanent magnet, an armature and a coil wound on the coil framework, wherein the coil framework is provided with a mounting hole which is arranged along the axial direction of an annular excitation coil, the armature is slidably arranged in the mounting hole and has sliding strokes in a first direction and a second direction which are mutually deviated, a first elastic body and a second elastic body which are respectively arranged on the first direction and the second direction of the armature and buffer the sliding stroke of the armature, the armature respectively has a static stable position on the first direction and the second direction, and the push rod reset piece are also included, when the armature slides towards the second direction, the second elastic reset element in the second direction is pushed, the push rod is pushed to move towards the second direction, when the armature slides towards the first direction, the push rod resetting piece can be abutted against the push rod and pushes the push rod to move towards the first direction. The electromagnetic valve provided by the invention has the advantages of remarkable silencing effect, small volume and low energy consumption.

Description

Mute electromagnetic valve

Technical Field

The invention relates to a mute electromagnetic valve.

Background

Solenoid valves are the basic elements of automation used to control fluids for adjusting the direction, flow rate, velocity and other parameters of a medium in a control system. In a common electromagnetic valve, a stationary core and a movable core are commonly provided, for example, the inventor provides a miniature high-efficiency dc bistable pulse electromagnetic valve in the utility model with the patent number CN200958626Y, which utilizes the current applied to the excitation coil to generate a magnetic force between the stationary core and the movable core, so as to adsorb the movable core to move towards the stationary core, one end of the movable core is usually provided with a valve plug, and when the movable core moves, the movable core drives the valve plug to move and further block or unblock the valve, so as to control the opening and closing of the valve. In the process, due to the fact that the working mode that the static iron core adsorbs the movable iron core to move is adopted, when the movable iron core moves towards the direction of the static iron core, the movable iron core finally collides with the static iron core so that the movement of the movable iron core is stopped, the electromagnetic valve generates noise in the process that sudden impact is stopped, and the kinetic energy of the movable iron core realizes energy conversion in the form of iron core deformation and sound wave. The electromagnetic valve is widely applied, for example, when the electromagnetic valve is applied to the fields of bathrooms and the like, the use experience is affected by the noise generated by the electromagnetic valve, the foreign standards of the bathroom industry, especially the european union standards, have extremely strict requirements on the noise, and the noise of the electromagnet in the electromagnetic valve is a chronic disease and a barrier in the bathroom industry for many years, and the export trade of Chinese products is always affected.

Disclosure of Invention

Therefore, in order to solve the above problems, the present invention provides a mute electromagnetic valve.

The invention is realized by adopting the following technical scheme:

the invention provides a mute electromagnetic valve, which comprises a coil framework, an armature and a coil wound on the coil framework, wherein the coil framework is provided with a mounting hole arranged along the axial direction of the coil, the armature is arranged in the mounting hole in a sliding manner, the mute electromagnetic valve also comprises a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet are approximately arranged at two ends of the armature and can generate magnetic force to the armature, under the excitation of the coil, the first permanent magnet and the second permanent magnet generate increase and decrease changes to the magnetic force of the armature, so that the armature has sliding strokes in a first direction and a second direction which are mutually deviated under the action of the magnetic force, a first elastic body and a second elastic body which are used for buffering the sliding stroke of the armature are respectively arranged in the first direction and the second direction of the armature, the armature respectively has a static stable position in the first direction and the second direction, when the armature is in the static stable position, the armature can reach a state of stress balance by magnetic force generated by the first permanent magnet and the second permanent magnet which are not excited by the coil, the armature further comprises a push rod and a push rod reset piece, the push rod and the armature are approximately arranged on the same axis, when the armature slides towards the second direction, the second elastic body in the second direction is pushed, then the second elastic body pushes the push rod to move towards the second direction, the push rod reset piece is connected to the armature, when the armature slides towards the first direction, the push rod reset piece can be abutted against the push rod, and the push rod is pushed to move towards the first direction.

Wherein, in order to save space, reduce the volume of solenoid valve to the thrust of transmission armature and the flexible of absorption head cup joint armature and push rod, the second elastomer setting is between armature and push rod.

Wherein, in order to save space, reduce the volume of solenoid valve, have the blind hole of seting up along the first direction on the armature, the aperture of blind hole is greater than the biggest external diameter of push rod, and the push rod has first end and the second end that deviates from each other, and the push rod stretches into the blind hole with its first end, and the blind hole is exposed outward to the push rod second end, and second elastomer one end is contradicted with the push rod, and the other end is contradicted with the hole bottom of blind hole.

Based on installation and manufacturing considerations, the second elastic body is sleeved on the push rod, the push rod is provided with a first step for the second elastic body to abut against, and when the armature slides towards the first direction, the push rod resetting piece can abut against the first step of the push rod and push the push rod to move towards the first direction.

Wherein, in order to provide the thrust of buffering and evenly transmitting armature, and absorb the flexible of head, the second elastomer is compression spring or rubber elastomer.

Based on installation and manufacturing considerations, the push rod resetting piece is an end cover which is sleeved on the second end of the push rod and connected to the opening of the blind hole of the armature, and the push rod is provided with a second step for abutting against the end cover.

The armature iron is arranged in the mounting hole, one end of the first elastic body abuts against the mounting seat, and the other end of the first elastic body abuts against the armature iron.

Wherein, in order to provide buffering and absorb the flexible of head, first elastomer is compression spring or rubber elastomer.

Wherein, for installing first elastomer better, first elastomer suit has the cylindricality structure that supplies first elastomer suit on the mount pad, and armature has the hole of stepping down of the cylindricality structure that holds the mount pad in the one end of first direction.

Wherein, for realizing the jam effect to the valve, the one end of push rod in the second direction is connected with the end cap that seals water.

The invention has the following beneficial effects: the mute electromagnetic valve provided by the invention does not have a static iron core, the armature is selected to drive the push rod to move to realize the control of the valve, and the elastic bodies are arranged at the two ends of the armature of the main moving part to buffer the movement of the armature and the push rod and also can relatively smoothly transfer energy, so that the armature can uniformly apply force to transfer the force to the push rod, and the mute effect is obvious because the process that the moving iron impacts the static iron does not exist. In addition, the mute electromagnetic valve provided by the invention has small volume and low energy consumption.

Drawings

FIG. 1 is an overall schematic view of a mute electromagnetic valve in an embodiment;

FIG. 2 is a schematic view of a bobbin in an embodiment;

FIG. 3 is a schematic illustration of a spring seat in an embodiment;

FIG. 4 is a schematic view of an armature of an embodiment;

FIG. 5 is a schematic view of a push rod in the embodiment;

FIG. 6 is a schematic view of an end cap according to an embodiment;

FIG. 7 is a cross-sectional view taken at A-A in FIG. 6;

FIG. 8 is a schematic view showing a state where the mute solenoid valve is closed in the embodiment;

fig. 9 is a schematic diagram of the mute solenoid valve in an open state in the embodiment.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1 to 9, a mute solenoid valve is provided as a preferred embodiment of the present invention, which can be used in the field of faucets to control the opening and closing of a water flow passage. The mute electromagnetic valve comprises a coil framework 1, a coil 2, a spring seat 3, a first permanent magnet 4, a second permanent magnet 5, an armature 6, a push rod 7, a first spring 8, a second spring 9, a water sealing plug 10, water sealing rubber 11, an end cover 12 and the like. Referring to fig. 1 and 2, the bobbin 1 is a substantially i-shaped solid of revolution in cross section, and the bobbin 1 has an outer groove 101, first and second

annular grooves

102 and 103 oppositely disposed at both ends of the bobbin 1, and a center hole 104. The coil 2 is wound in an outer groove 101 of the coil framework 1, the first permanent magnet 4 and the second permanent magnet 5 are respectively installed in a first annular groove 102 and a second annular groove 103, and the armature 6, the push rod 7, the first spring 8, the second spring 9 and the water sealing plug 10 are installed in a central hole 104. In the position of the diagram of fig. 1, the position of the first permanent magnet 4 relative to the second permanent magnet 5 is defined as the left side, and the position of the second permanent magnet 5 relative to the first permanent magnet 4 is defined as the right side. Spring holder 3 is also mounted in first annular groove 102, and as shown in fig. 3, spring holder 3 is a rotary body including base portion 301 for mounting and positioning spring holder 3 in first annular groove 102, and boss 302 protruding outward from the center of base portion 301, spring holder 3 has third annular groove 303 at the connection portion between boss 302 and base portion 301, and when spring holder 3 is mounted in first annular groove 102, it is mounted in the direction in which boss 302 faces central hole 104, and after mounting, boss 302 is located in central hole 104, and base portion 301 is flush with the left end face of bobbin 1. The first permanent magnet 4, the second permanent magnet 5 and the spring seat 3 can be mounted on the coil bobbin 1 in various manners such as screwing, clamping, bonding and the like, and exemplarily, the first permanent magnet 4, the second permanent magnet 5 and the spring seat 3 are fixedly mounted in a bonding manner in this embodiment. The spring seat 3 may be a separate member as in the present embodiment, but may also be integrally formed with the bobbin 1, and in such a structure, the first permanent magnet 4 needs to be disposed on the outer end surface of the bobbin 1 or other portions. In the present embodiment, the coil 2 is preferably a ring-shaped excitation coil, and the central hole 104 is opened along the axial direction of the coil 2 to improve the accuracy of the movement of the armature 6 in the central hole 104, but in other embodiments, the coil 2 may have other shapes such as a square shape.

The armature 6, the push rod 7, the first spring 8, the second spring 9 and the water shutoff plug 10 are all mounted in the central hole 104. Referring to fig. 4, the armature 6 is a cylindrical rotary body, and has a first blind hole 61 with a shallow opening on the left side and a second blind hole 62 with a deep opening on the right side, and the second blind hole 62 is provided with an internal thread 63 at the opening position. Referring to fig. 1, the aperture of the first blind hole 61 is slightly larger than the diameter of the convex pillar 302, so that the convex pillar 302 can extend into the first blind hole 61 (i.e., the first blind hole 61 gives way to the convex pillar 302), the first spring 8 is sleeved on the convex pillar 302, the left end of the first spring 8 abuts against the groove bottom of the third annular groove 303 (i.e., the base portion 301), and the right end of the first spring 8 abuts against the left end surface of the armature 6, so that the armature 6 can slide left and right relative to the spring seat 3. The first spring 8 can be better sleeved by the convex column 302, and in other embodiments, the convex column 302 is not provided, and the first spring 8 is directly abutted against the base body 301 of the spring seat 3.

Referring to fig. 5, the push rod 7 is substantially a stepped shaft in shape, and includes a first shaft section 71, a second shaft section 72 and a third shaft section 73, the second shaft section 72 has a larger shaft diameter than the first shaft section 71 and the third shaft section 73, and shoulders formed by the second shaft section 72 and the first shaft section 71 and the third shaft section 73 are defined as a first stepped section 74 and a second stepped section 75, respectively. The third shaft section 73 also has a third blind bore 76 at an end (right end as shown) remote from the second stepped section 75. Referring to fig. 1, the push rod 7 projects into the second blind hole 62 of the armature 6 (the axial diameter of the second shaft section 72 is slightly smaller than the diameter of the second blind hole 62). The second spring 9 is sleeved on the first shaft section 71, the left end of the second spring 9 abuts against the bottom of the second blind hole 62 (i.e. the solid part between the first blind hole 61 and the second blind hole 62 in the armature 6 body), and the right end of the second spring 9 abuts against the first step section 74, so that the push rod 7 can slide left and right relative to the armature 6. The third blind hole 76 is used for installing the water sealing plug 10, and various methods such as screwing, bonding, clamping and the like can be specifically adopted, and in the embodiment, screwing is exemplarily adopted. The water sealing plug 10 is coated with a layer of water sealing rubber 11 to enhance the sealing capability of blocking the water flow channel.

In this embodiment, the first permanent magnet 4 and the second permanent magnet 5 are both made of neodymium iron boron permanent magnet materials; in the present embodiment, the installation manner of sleeving the armature 6 on the push rod 7 is selected, but in other embodiments, the push rod 7 may be sleeved on the armature 6 in reverse, and based on the technology provided by the present embodiment, a person skilled in the art can easily make structural adaptation; in this embodiment, the first spring 8 and the second spring 9 are compression springs, but in other embodiments, other elastic bodies, such as rubber elastic bodies, may be used.

The end cap 12 is generally T-shaped in cross-section and, as shown in figures 6 and 7, the end cap 12 has a central bore 121 which mates with the third shaft section 73 and the end cap 12 is further externally threaded 122 which mates with the internal threads 63. Referring to fig. 1, the end cap 12 is fitted over the third shaft section 73, and the outer thread 122 thereof is screwed to the inner thread 63, thereby fixing the end cap 12 to the right end of the armature 6.

Fig. 8 and 9 show two states of the mute solenoid valve, namely, a closed state (fig. 8) and an open state (fig. 9), respectively, and the operation mode of the mute solenoid valve is as follows:

1. a valve closing state: referring to fig. 8, in a valve closing state, the armature 6 is closer to the second permanent magnet 5 on the right side, and is relatively far away from the first permanent magnet 4 on the left side, the second permanent magnet 5 has a strong suction force on the armature 6, and adsorbs the armature 6 to move to the right, and the armature 6 compresses the second spring 9 while moving to the right, and uniformly transmits the force to the push rod 7 through the second spring 9, and pushes the push rod 7 to the right, so that the water sealing plug 10 and the water sealing rubber 11 connected to the push rod 7 abut against the blocked water flow channel 200 towards the right (fig. 8 shows the water flow channel 200 for illustration, as an application, refer to the inventor's utility model patent No. CN 200958626Y).

2. Moving from a valve-closing state to a valve-opening state: referring to fig. 8 and 9, in the valve-closed state, a positive voltage pulse is applied to the coil 2, so that the coil 2 generates a magnetic field which is added to the first permanent magnet 4 and subtracted from the second permanent magnet 5, at which time the attraction force of the first permanent magnet 4 to the armature 6 increases, the attraction force of the second permanent magnet 5 to the armature 6 decreases (or disappears), and on the one hand, since the attraction force of the first permanent magnet 4 to the armature 6 is greater than the attraction force of the second permanent magnet 5 to the armature 6, the armature 6 moves to the left under the attraction force of the first permanent magnet 4, and on the other hand, since the attraction force of the first permanent magnet 4 to the armature 6 is greater than the attraction force of the second permanent magnet 5 to the armature 6, so that the attraction force to the right, which was originally against the elastic restoring force of the second spring 9, disappears and the second spring 9 simultaneously urges the armature 6 to move to the left with its elastic restoring force (the second spring 9, which was originally compressed, generates an elastic restoring force to the left since the right end of the push rod 7 has been pressed against the blocked water flow passage). When the armature 6 moves towards the left, the first spring 8 is compressed to perform motion buffering. In the process that the armature 6 moves leftwards, the end cover 12 connected to the armature 6 also moves leftwards, and finally the left end face of the end cover 12 contacts the second step section 75, so that the end cover 12 drives the push rod 7 to move leftwards, and the water sealing plug 10 and the water sealing rubber 11 connected to the push rod 7 do not block the water flow channel 200 any more. When the resultant force of the attraction forces of the first permanent magnet 4 and the second permanent magnet 5 to the armature 6 is equal to the elastic restoring force of the first spring 8, the force balance is achieved, and the armature 6 stops moving. At this time, since the armature 6 has moved to the position toward the left, even if the coil 2 is not energized at this time, the attraction force of the first permanent magnet 4 to the armature 6 is greater than the attraction force of the second permanent magnet 5 to the armature 6, so that the armature 6 is stabilized at the position toward the left, and the force balance is achieved.

3. And (3) opening a valve: referring to fig. 9, after moving from the valve closing state to the valve opening state, the armature 6 is still stabilized at the position close to the left side without energizing the coil 2, and the water blocking plug 10 and the water blocking rubber 11 on the push rod 7 driven by the armature 6 do not block the water flow passage 200 any more.

4. Moving from an open valve state to a closed valve state: referring to fig. 8 and 9, in the open state, a negative voltage pulse is applied to the coil 2, so that the coil 2 generates a magnetic field which is added to the second permanent magnet 5 and subtracted from the first permanent magnet 4, and at this time, the attraction force of the second permanent magnet 5 to the armature 6 increases, and the attraction force of the first permanent magnet 4 to the armature 6 decreases (or disappears). At the moment, the second permanent magnet 5 has stronger attraction force on the armature 6, the adsorption armature 6 moves rightwards, the armature 6 moves rightwards and compresses the second spring 9, the force is uniformly transmitted to the push rod 7 through the second spring 9, and the push rod 7 is pushed rightwards, so that the water sealing plug 10 and the water sealing rubber 11 connected to the push rod 7 abut against the water blocking channel 200 rightwards. Even if the coil 2 is not electrified at the moment, the attraction force of the second permanent magnet 5 to the armature 6 is also larger than the attraction force of the first permanent magnet 4 to the armature 6, so that the armature 6 is stabilized at a position close to the right side, the stress balance is achieved, and the armature abuts against a water flow channel. Thus completing a work cycle.

In the valve-closed state (fig. 8), since the first spring 8 needs to oppose both the attraction force of the first permanent magnet 4 to the armature 6 and the elastic restoring force to the left of the second spring 9, the elastic coefficient of the first spring 8 may be larger than that of the second spring 9.

In the present embodiment, the directions "left" and "right" are used to facilitate the description of the solution, but obviously, the mute electromagnetic valve provided in the present embodiment is not limited by the installation and placement directions.

The mute electromagnetic valve is exemplarily applied to the field of water taps to control the opening and closing of the water flow channel to combine the features of the mute electromagnetic valve, but the mute electromagnetic valve provided by the embodiment can also be applied to control other fluids, such as gas.

The greatest feature of the mute electromagnetic valve provided by the embodiment is that: the valve is controlled by selecting the movement of the push rod 7 driven by the armature 6 without a static iron core, and the first spring 8 and the second spring 9 are arranged at the two ends of the armature 6 of the main moving part, and the first spring 8 and the second spring 9 can be used for buffering the movement of the armature 6 and the push rod 7 and can also relatively smoothly transfer energy, so that the armature 6 can uniformly apply force to transfer the force to the push rod 7, and the generation of noise is avoided. In addition, the push rod 7 is arranged in the second blind hole 62, so that the overall size of the electromagnetic valve is reduced, and the energy consumption of the electromagnetic valve is reduced due to the working mode of only needing instantaneous pulse current.

Although the left end face of the end cap 12 will contact the second step 75 during the valve opening process, the movement of the armature 6 is gentle due to the first spring 8 and the second spring 9, and does not collide with the plunger as strongly (rigidly) as in the prior art, so the sound of the end cap 12 contacting the second step 75 is small and has little influence. Also, it may be preferable to provide a flexible material (e.g., rubber-coated) on the left end surface of the end cap 12 (or on the second step 75), and the end cap 12 itself may be made of a plastic material with a lower hardness to reduce the contact between the end cap 12 and the second step 75.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a silence solenoid valve, includes coil skeleton, armature and the coil of winding on the coil skeleton, and the coil skeleton has the mounting hole of seting up along the axis direction of coil, and armature slidable ground sets up in the mounting hole, its characterized in that: the magnetic force of the first permanent magnet and the second permanent magnet is approximately arranged at two ends of the armature and can generate magnetic force to the armature, the first permanent magnet and the second permanent magnet can increase and decrease the magnetic force of the armature under the excitation of the coil, so that the armature has sliding strokes in a first direction and a second direction which are mutually deviated under the action of the magnetic force, a first elastic body and a second elastic body which buffer the sliding strokes of the armature are respectively arranged in the first direction and the second direction of the armature, the armature respectively has a static stable position in the first direction and the second direction, when the armature is in the static stable position, the magnetic force generated by the first permanent magnet and the second permanent magnet which are not excited by the coil can enable the armature to reach a state of stress balance, the push rod and the push rod reset piece are further included, the push rod and the armature are approximately arranged on the same axis, when armature slides towards the second direction, the second elastic body in the second direction is pushed, then the second elastic body pushes the push rod to move towards the second direction, the push rod reset piece is connected to the armature, and when the armature slides towards the first direction, the push rod reset piece can be abutted to the push rod and pushes the push rod to move towards the first direction.

2. A silent electromagnetic valve as claimed in claim 1, wherein: the armature is sleeved with the push rod, and the second elastic body is arranged between the armature and the push rod.

3. A silent electromagnetic valve according to claim 2, characterized in that: the blind hole that sets up along the first direction has on the armature, and the aperture of blind hole is greater than the biggest external diameter of push rod, and the push rod has first end and the second end that deviates from each other, and the push rod stretches into the blind hole with its first end, and the blind hole is held to the push rod second outer exposure, and second elastomer one end is contradicted with the push rod, and the other end is contradicted with the hole bottom of blind hole.

4. A silent electromagnetic valve according to claim 2, characterized in that: the second elastomer suit has the first step that supplies the second elastomer to contradict on the push rod, and when armature slided towards first direction, push rod reset piece can contradict on the first step of push rod to promote the push rod to move towards first direction.

5. A silent electromagnetic valve according to claim 4, characterized in that: the second elastic body is a compression spring or a rubber elastic body.

6. A silent electromagnetic valve according to claim 3, characterized in that: the push rod reset piece is an end cover which is sleeved on the second end of the push rod and connected to the opening of the blind hole of the armature, and the push rod is provided with a second step for abutting against the end cover.

7. A silent electromagnetic valve as claimed in claim 1, wherein: the mounting hole is formed in the other end of the mounting hole, the armature stretches into the mounting hole from the opening of the mounting hole, the first elastic body is mounted in the mounting hole, one end of the first elastic body abuts against the mounting seat, and the other end of the first elastic body abuts against the armature.

8. A silent electromagnetic valve as claimed in claim 7, wherein: the first elastic body is a compression spring or a rubber elastic body.

9. A silent electromagnetic valve as claimed in claim 7, wherein: the first elastic body suit has the cylindricality structure that supplies the first elastic body suit on the mount pad, and armature has the hole of stepping down that holds the cylindricality structure of mount pad in the one end on first direction.

10. A silent electromagnetic valve as claimed in claim 1, wherein: one end of the push rod in the second direction is connected with a water sealing plug.