Low-noise water drainage electromagnetic valve

Abstract

The utility model discloses a low-noise drainage solenoid valve, which comprises a valve body and a valve core, a valve cavity is arranged on the valve body, the valve core comprises a column body and a sealing head, the column body is arranged in the valve cavity, a spring is arranged in the valve cavity, a boss is arranged on the valve body at the circumferential position of an opening of the valve cavity, and the sealing head is arranged on the sealing head when the valve is powered on. And when the valve core retreats into the valve cavity, the sealing head is in contact with the boss. Under the condition of continuous electrification, only two small planes on the boss are arranged on the contact surface when the sealing head retracts, and due to the fact that the contact area is reduced by hundreds of times compared with an existing structure, only low noise is generated. Even if an alternating current coil is used, the sealing head and the boss are repeatedly impacted at high frequency, and the generated noise is very small. Compared with an existing structure, the alternating current coil used by the structure can reach 70 dB to the maximum, and the alternating current coil used by the structure can be reduced to 30 dB or even lower.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic valves, in particular to a low-noise water discharge electromagnetic valve. Background Art

[0002] Solenoid valves are widely used, simple and convenient to control, and are widely used in home appliances such as washing machines, water purifiers, ovens, dishwashers, water heaters, etc. Among them, drain solenoid valves are often used to cut off the water flow in home appliance pipelines.

[0003] A known design of an existing drain valve includes a valve body and an electromagnetic control device. The valve body is provided with one or more water inlets and one or more water outlets, and the valve body is provided with a water sealing surface structure. The electromagnetic control device includes an iron core assembly, an inner sleeve and a coil. A rubber core is installed at the head of the iron core assembly, and a spring is installed at the tail. When the power is off, the rubber core on the iron core blocks the water sealing surface under the action of the spring, and water does not flow at this time. When the power is on, the coil generates an electromagnetic force, and the iron core drives the rubber core away from the sealing ring under the action of the electromagnetic force, and the water flows directly through the waterway to complete the water flow. However, when the structure is powered on, the rubber core will collide with the inner sleeve at a high frequency to generate noise. If the structure is changed to allow the iron core to contact the inner sleeve or other components in the inner sleeve in order to avoid the high-frequency collision of the rubber core, the iron core will collide with the top of the inner sleeve or other components in the inner sleeve at a high frequency to generate noise. Since the size and direction of the alternating current will change periodically, there will be a phenomenon of high-frequency collision between the components after the power is turned on, so the noise is particularly serious when using an AC coil.

[0004] To avoid the above problems, most existing drain valves use AC coils with external or built-in rectifier bridges, but this will add extra costs to the original coils. Or use DC coils, which requires the inevitable cost of a built-in transformer in the valve equipment. In addition, the above two solutions will still produce pull-in noise when the coil is energized.

[0005] The patent document with the publication date of August 23, 2022 and the publication number of CN217272247U discloses a drain solenoid valve, in which the head of the iron core of the structure is connected to the rubber core through a plastic part. The plastic part includes a connecting part and a resisting part. The connecting part of the plastic part is connected to the head of the moving iron core, and the resisting part of the plastic part is connected to the rubber valve plug. The diameter of the resisting part of the plastic part is larger than the diameter of the valve port, and the resisting part of the plastic part presses the rubber valve plug against the valve port. This structure improves the sealing performance, but when the power is turned on, the rubber core will fit the inner sleeve to generate noise, especially when using an AC coil, the rubber core will hit the inner sleeve back and forth at a high frequency to generate huge noise.

[0006] The patent document with the publication date of July 28, 2020 and the publication number of CN211117886U discloses a water drain solenoid valve. The inner sleeve of the structure has a step, and a magnetic core with a sealing ring is installed on the step. An iron core is installed under the conductive core, a spring is installed between the tail of the iron core and the magnetic core, and a rubber core is installed at the head of the iron core. The water inlet height of the shell of this structure is higher than the water outlet and the water sealing surface inside the shell. It has the advantages of compact structure, avoiding water accumulation, and preventing pipes from being frozen and cracked in winter. However, when the power is turned on, the iron core will fit the magnetic core to produce noise, especially when using an AC coil, the iron core will hit the magnetic core back and forth at a high frequency to produce huge noise. Summary of the invention

[0007] The purpose of the utility model is to provide a drain valve of the above type, which can avoid the noise problem according to the prior art no matter whether it uses alternating current or direct current.

[0008] In order to solve the above problems, the utility model adopts the following technical solutions: a low-noise drain solenoid valve, including a valve body and a valve core, the valve body is provided with a valve cavity, the valve core includes a column and a sealing head, the column is provided in the valve cavity, a spring is provided in the valve cavity, and the valve body is provided with a boss at the circumferential position of the valve cavity opening. When the power is turned on, the valve core retreats into the valve cavity, and the sealing head contacts the boss. When the power is turned on continuously, the fitting surface of the rubber core and the inner sleeve is only two small planes on the boss. Since the contact area is reduced by a hundred times compared with the existing structure, only low noise is generated. Even if an AC coil is used to make the sealing head and the boss on the inner sleeve collide repeatedly at a high frequency, the noise generated is very small. Compared with the existing structure using an AC coil, which can reach up to 70dB, the structure using an AC coil can reduce it to 30dB or even lower.

[0009] In the above technical solution, preferably, the valve body includes a shell and an inner sleeve, the shell and the inner sleeve are assembled together, the inner wall of the inner sleeve forms the valve cavity, and the outer ring of the inner sleeve is provided with a coil.

[0010] In the above technical solution, preferably, the valve body also includes a water pipe, the water pipe has an upward opening in the middle, the shell is connected to the opening, a circle of baffles is provided in the opening, the area between the opening and the baffle is communicated with the water inlet of the water pipe, and the area surrounded by the baffle is communicated with the water outlet of the water pipe.

[0011] In the above technical solution, preferably, a sealing ring is provided at the connection between the shell and the water pipe.

[0012] In the above technical solution, preferably, a circle of sealing protrusions is provided on the shell, a groove is provided on the sealing ring, the width of the groove is smaller than the width of the sealing protrusion, and the sealing ring is stuck on the sealing protrusion by elastic deformation.

[0013] In the above technical solution, preferably, the outer ring of the sealing head is a silicone sleeve.

[0014] In the above technical solution, preferably, there are multiple bosses, and the bosses are arranged on the inner sleeve.

[0015] Compared with the existing technology, a low-noise water discharge solenoid valve is adopted, which has the following advantages:

[0016] The utility model provides a low-noise drain solenoid valve. When the power is continuously on, the fitting surface between the rubber core and the inner sleeve is only two small planes on the boss. Since the contact area is reduced by a hundred times compared with the existing structure, only low noise is generated. Even if an AC coil is used to make the sealing head and the boss collide repeatedly at a high frequency, the noise generated is very small. Compared with the existing structure using an AC coil, which can reach up to 70dB, the structure using an AC coil can reduce it to 30dB or even lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the structural cross-section of Example 1 of the utility model when the power is off.

[0019] Figure 2 This is a schematic diagram of the structural cross-section of Example 1 of the utility model when powered on.

[0020] Figure 3 This is a partial schematic diagram of the structure of the boss in the inner sleeve of Example 1 of the utility model.

[0021] Figure 4 for Figure 1 A partial enlarged schematic diagram in the middle.

[0022] Figure 5 for Figure 1 A partial enlarged schematic diagram of point B in the middle.

[0023] Figure 6 for Figure 2 A partial enlarged schematic diagram of .

[0024] Figure 7 This is a schematic diagram of Example 2 of the utility model.

[0025] Figure 8 This is a schematic diagram of Example 3 of the utility model.

[0026] Among them: 1. valve body; 2. valve core; 101. valve chamber; 3. spring; 102. boss; 21. cylinder; 22. sealing head; 11. shell; 12. inner sleeve; 13. coil; 111. opening; 112. baffle; 15. sealing ring; 151. groove; 121. sealing protrusion; 221. silicone sleeve. DETAILED DESCRIPTION

[0027] The following are specific embodiments of the present invention and the accompanying drawings to illustrate the technical solution of the present invention.

[0028] Further description is given, but the present invention is not limited to these embodiments.

[0029] Example 1, reference Figures 1 to 6 A low-noise drain solenoid valve comprises a valve body 1 and a valve core 2. The valve body 1 is provided with a valve cavity 101. The valve core 2 comprises a column 21 and a sealing head 22. The column 21 is provided in the valve cavity 101. A spring 3 is provided in the valve cavity 101. The valve body 1 is provided with a conical boss 102 at a circumferential position at the opening of the valve cavity 101. When the power is turned on, the valve core 2 retreats into the valve cavity 101, and the sealing head 22 contacts the boss 102.

[0030] The valve body 1 includes a shell 11 and an inner sleeve 12 , which are assembled together. The inner wall of the upper portion of the inner sleeve 12 forms the valve cavity 101 , and the outer ring of the inner sleeve 12 is provided with a coil 13 .

[0031] The shell has an upward opening 111 in the middle, the inner sleeve 12 is connected to the opening 111, a circle of baffles 112 is provided in the opening 111, the area between the opening 111 and the baffles 112 is communicated with the water inlet, and the area surrounded by the baffles 112 is communicated with the water outlet.

[0032] A sealing ring 15 is provided at the connection between the inner sleeve 12 and the housing 11. The inner sleeve 12 is provided with a circle of sealing protrusions 121, and the sealing ring 15 is provided with a groove 151, the width of the groove 151 is smaller than the width of the sealing protrusion 121, and the sealing ring 151 is clamped on the sealing protrusion 111 by elastic deformation.

[0033] The outer ring of the sealing head 22 is a silicone sleeve 221 .

[0034] There are a plurality of bosses 102 , and the bosses 102 are arranged on the inner sleeve 12 .

[0035] Example 2, see Figure 7 In this embodiment, the boss 102 is in the shape of a rectangular parallelepiped, and the rest is the same as in the first embodiment.

[0036] Example 3, see Figure 8 In this embodiment, the boss 102 is in a circular shape, and the rest is the same as in the first embodiment.

[0037] When the power is continuously on, the only contact surface between the silicone sleeve outside the sealing head and the inner sleeve is two small planes on the boss. Since the contact area is reduced by a hundred times compared with the existing structure, only low noise is generated. Even if an AC coil is used to make the sealing head and the boss on the inner sleeve collide repeatedly at a high frequency, the noise generated is very small. Compared with the existing structure using an AC coil, which can reach up to 70dB, this structure can reduce it to 30dB or even lower.

[0038] Although this article uses more professional terms, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0039] In addition to the above-mentioned embodiments, within the scope disclosed in the claims and the specification of the utility model, the technical features or technical data of the utility model can be reselected and combined to form new embodiments, which can be achieved by those skilled in the art without creative work. Therefore, these embodiments that are not described in detail in the utility model should also be regarded as specific embodiments of the utility model and within the protection scope of the utility model.

Claims

1. A low-noise drain solenoid valve, comprising a valve body and a valve core, wherein the valve body is provided with a valve cavity, the valve core comprises a column and a sealing head, the column is provided in the valve cavity, and a spring is provided in the valve cavity, characterized in that: The valve body is provided with a boss at a circumferential position of the valve cavity opening. When power is turned on, the valve core retreats into the valve cavity, and the sealing head contacts the boss.

2. A low-noise water drain solenoid valve according to claim 1, characterized in that: The valve body comprises a shell and an inner sleeve, the shell and the inner sleeve are assembled together, the inner wall of the inner sleeve forms the valve cavity, and the outer ring of the inner sleeve is provided with a coil.

3. A low-noise water drain solenoid valve according to claim 2, characterized in that: The shell body has an upward opening in the middle, the inner sleeve is connected to the opening, a circle of baffles is provided in the opening, the area between the opening and the baffles is communicated with the water inlet, and the area surrounded by the baffles is communicated with the water outlet.

4. A low-noise water drain solenoid valve according to claim 2, characterized in that: A sealing ring is arranged at the connection between the inner sleeve and the shell.

5. A low-noise water drain solenoid valve according to claim 4, characterized in that: The inner sleeve is provided with a circle of sealing protrusions, the sealing ring is provided with a groove, the width of the groove is smaller than the width of the sealing protrusion, and the sealing ring is clamped on the sealing protrusion by elastic deformation.

6. A low-noise water drain solenoid valve according to claim 1, characterized in that: The outer ring of the sealing head is a silicone sleeve.

Images