A solenoid valve and method of using the same

Abstract

The application belongs to the technical field of electromagnetic valves and relates to an electromagnetic valve and a use method thereof. The electromagnetic valve comprises a valve body, a valve rod and a ball, and the valve body is internally provided with a valve cavity. The valve cavity is provided with a liquid inlet and a liquid outlet. The valve rod comprises a sliding rod and a driving rod. The sliding rod is slidably arranged between the liquid inlet and the liquid outlet, and the sliding rod is internally provided with a flow channel. One end of the flow channel is communicated with the liquid inlet, and the other end is provided with a ball socket opening. The ball is opposite to the ball socket opening and is arranged between the liquid outlet and the ball socket opening. The shape of the ball socket opening is matched with the shape of the ball. One end of the driving rod is sleeved with a spring, and the other end is sleeved with an electromagnetic coil. The electromagnetic coil and the spring jointly drive the driving rod to make the ball socket opening and the ball adhere to or separate from each other. When the electromagnetic valve in the application is closed, the pulse alternating current with variable frequency is connected to the electromagnetic coil, the direction of the magnetic force generated by the electromagnetic coil is rapidly reciprocated, the valve rod generates high-frequency vibration in the closing process, and thus the dirt between the ball socket opening and the ball is removed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electromagnetic valves, and relates to an electromagnetic valve and a use method thereof. BACKGROUND

[0002] Valves are used to open and close pipelines, control flow direction, and adjust and control parameters (temperature, pressure and flow) of the conveyed medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves and the like.

[0003] Shut-off valves are used to open and close. They are usually arranged on the inlet and outlet of cold and hot sources, the inlet and outlet of equipment, and the branch line of pipelines (including vertical pipelines), and can also be used as water discharge valves and air discharge valves. Common shut-off valves include gate valves, stop valves, ball valves and butterfly valves.

[0004] 1. Gate valves can be divided into open stem and closed stem, single gate plate and double gate plate, wedge-shaped gate plate and parallel gate plate. Gate valves have poor sealing tightness, large-diameter gate valves are difficult to open, the valve body size is small along the water flow direction, the flow resistance is small, and the nominal diameter span of the gate valve is large.

[0005] 2. Stop valves are divided into straight-through type, right-angle type and straight-flow type according to the medium flow direction, and are divided into open stem and closed stem. The sealing tightness of the stop valve is better than that of the gate valve, the valve body is long, the flow resistance is large, and the maximum nominal diameter is DN200.

[0006] 3. The valve core of the ball valve is a perforated spherical ball. When the ball is turned to make the perforation face the pipeline axis, it is fully open, and when it is turned by 90°, it is fully closed. The ball valve has certain adjusting performance and is relatively tight when closed.

[0007] 4. The valve core of the butterfly valve is a circular valve plate, which can be rotated along the vertical axis of the pipeline. When the valve plate plane is consistent with the pipeline axis, it is fully open; when the valve plate plane is perpendicular to the pipeline axis, it is fully closed. The butterfly valve has small valve body length and small flow resistance, and is more expensive than the gate valve and the stop valve.

[0008] The above-mentioned valves have a common shortcoming that when a certain amount of impurities such as silt particles exist in the fluid, the sealing is not tight, the wear is serious, and the pipeline is blocked, which eventually leads to fluid leakage, safety hazards and restrictions on pipeline transportation and discharge. Especially when using a ball valve, if there are relatively hard substances in the fluid, the valve body and the gasket will rotate relative to each other when opening and closing the valve, and the dirt will be trapped between the valve body and the gasket. Over time, the hard objects will scratch the spherical surface, and after removing the hard objects, the valve body will still have a slight leakage, which is permanent damage to the valve body. If not repaired and replaced in time, cavitation will occur, making the leakage more serious and affecting production safety. SUMMARY

[0009] In view of the above, the present application aims to solve the defects of the prior art, and provide an electromagnetic valve and a method for using the same.

[0010] To achieve the above object, the present application provides the following technical solutions.

[0011] An electromagnetic valve comprises a valve body, a valve rod and a ball, the valve body is provided with a valve cavity, and the valve rod and the ball are arranged in the valve cavity.

[0012] One end of the valve cavity is provided with an inlet, and the other end is provided with an outlet; the valve rod comprises a sliding rod and a driving rod which are fixed to each other; the sliding rod is arranged between the inlet and the outlet, and is in sliding sealing with the inner wall of the valve cavity; the sliding rod is provided with a flow channel, one end of the flow channel is communicated with the inlet, and the other end is provided with a ball socket opening communicated with the outlet.

[0013] The ball is arranged between the outlet and the ball socket opening, and is arranged opposite to the ball socket opening; the shape of the ball socket opening matches the shape of the ball.

[0014] One end of the driving rod close to the sliding rod is sleeved with a spring, and the other end is sleeved with an electromagnetic coil; the electromagnetic coil and the spring jointly act on the driving rod after being energized, to drive the sliding rod to slide, so that the ball socket opening is attached to or separated from the ball; when the ball socket opening is attached to the ball, the flow channel is closed, and when the ball socket opening is separated from the ball, the flow channel is opened.

[0015] Further, the ball is in a free state in the valve cavity.

[0016] Further, the outlet is provided with a cross beam which divides the outlet into two parts, and the cross beam is used for preventing the ball from falling out.

[0017] Further, the ball socket opening is arranged eccentrically, the ratio of the diameter of the ball to the eccentric distance from the center of the ball socket opening to the center line of the sliding rod is 9.5-10; and the attachment area of the ball socket opening to the ball is not more than half of the spherical surface area of the ball.

[0018] Further, the electromagnetic coil is wrapped with a ferrite magnetic conductor, to increase the magnetic force of the electromagnetic coil and protect the electromagnetic coil.

[0019] Further, the electromagnetic coil is sleeved on the valve body, and a heat insulation and shock absorption washer is arranged between the electromagnetic coil and the valve body.

[0020] Further, the valve interface is sleeved on the valve body and communicated with the inlet.

[0021] Further, the valve body is provided with a buffer cavity at one end away from the liquid outlet, the driving rod is arranged in the buffer cavity, the electromagnetic coil is sleeved outside the buffer cavity, and the valve cavity is provided with a limiting end face, one end of the spring is abutted against the end face of the sliding rod, and the other end is abutted against the limiting end face.

[0022] A use method of the electromagnetic valve, including opening and closing processes of the electromagnetic valve; the opening process is that direct current is supplied to the electromagnetic coil in the opening process, the magnetic force generated by the electromagnetic coil is used to pull up the valve rod, the ball socket opening is separated from the ball, and the flow channel is opened; the closing process is that the direct current of the electromagnetic coil is converted into pulsed alternating current with variable frequency in the closing process, the frequency of the pulsed alternating current is gradually increased in the process from starting closing to complete closing, the magnetic force generated by the electromagnetic coil is used to make the valve rod vibrate at high frequency, and the high-frequency vibration is used to remove dirt between the ball socket opening and the ball; and then the pulse width is gradually reduced to 0%, so that the ball socket opening is completely attached to the ball.

[0023] Further, the electromagnetic coil is converted from direct current into pulsed alternating current in the closing process, the initial frequency is 1-5 kHz, the pulse width is 20-50%, and then the frequency is gradually increased to 15-22 kHz, the pulse width is kept unchanged in the process of increasing the frequency; the time of the process of increasing the frequency is 2-6 s, the pulse width is gradually reduced to 0% in 3-5 s after keeping the highest frequency for 1-3 s.

[0024] The electromagnetic valve has the following beneficial effects:

[0025] 1. In the closing process of the electromagnetic valve, pulsed alternating current with variable frequency is supplied to the electromagnetic coil, the direction of the magnetic force generated by the electromagnetic coil is rapidly reciprocated, the valve rod vibrates at high frequency in the closing process, and dirt between the ball socket opening and the ball is removed.

[0026] 2. In the closing process of the electromagnetic valve, the initial frequency of the supplied current is 1-5 kHz, so as to reduce the impact of water hammer effect on the valve in the closing process; the high-frequency vibration generated when working at 15-22 kHz can effectively remove dirt on the surface of the ball socket opening and the ball; when hard impurities are clamped between the contact surfaces, the sealing will not be tight, the ball socket opening is arranged eccentrically, and when liquid leaks, single-sided flow will appear on the ball surface; according to Bernoulli's law, the water flow will make the ball rotate, the rotation direction of the ball is not determined, but is determined according to the clamped position, the water flow of the gap will be high, and the water flow drives the ball to rotate and impact the impurities to remove them.

[0027] 3. The electromagnetic coil works at a frequency of 1 kHz to 22 kHz, the frequency is in the sound wave range, a heat insulation and shock absorption washer can be added to absorb the vibration generated when the coil works, so as to prevent the valve body from generating strong resonance and effectively reduce noise. Meanwhile, the influence of coil heating on the liquid in the valve can be reduced.

[0028] 4、The electromagnetic valve in the application can work for a long time without overpressure overload, is suitable for frequently switching occasions, reduces the situation of dripping and not closing tightly, and is more suitable for pipelines with liquid that is not filtered well and some hard dirt; due to the relatively simple structure, if wear or damage occurs, only the valve rod and the ball need to be replaced, reducing maintenance and maintenance costs.

[0029] Other advantages, objects, and features of the present application will be apparent to those skilled in the art from the following specification, in conjunction with the accompanying drawings. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the specification and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to make the objects, technical solutions and advantages of the present application clearer, the preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, in which:

[0031] Figure 1 It is a schematic diagram of the overall structure of the electromagnetic valve in the application;

[0032] Figure 2 It is a schematic diagram of the liquid outlet in the application;

[0033] Figure 3 、 4 It is a schematic diagram of the principle of discharging dirt when the electromagnetic valve in the application is closed.

[0034] Reference signs: 1 - valve interface; 2 - valve body; 3 - valve rod; 4 - ball; 5 - spring; 6 - electromagnetic coil; 7 - heat insulation and shock absorption washer; 8 - nut; 9 - gasket; 10 - locking nut; 11 - ferrite magnetic conductor; 12 - liquid inlet; 13 - liquid outlet; 14 - external thread; 15 - valve cavity; 16 - buffer cavity; 17 - cross beam; 18 - flow channel. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure of the specification. The present application can also be implemented or applied through different specific embodiments, and the details in the specification can be modified or changed in different ways without departing from the spirit of the present application. It should be noted that the diagrams provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and the following examples and features in the examples can be combined with each other without conflict.

[0036] The drawings are only used for exemplary illustration, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation on the present application; in order to better illustrate the embodiments of the present application, some components in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings can be omitted.

[0037] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back" and the like are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the present application, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0038] Please refer to Figures 1-4 , an electromagnetic valve, comprising a valve body 2, a valve rod 3, and a ball 4, wherein the valve body 2 is provided with a valve cavity 15, the valve rod 3 and the ball 4 are both installed in the valve cavity 15; one end of the valve cavity 15 is provided with a liquid inlet 12, and the other end is provided with a liquid outlet 13; the valve rod 3 comprises a sliding rod and a driving rod which are fixed to each other; the sliding rod is installed between the liquid inlet 12 and the liquid outlet 13 and is in sliding seal with the inner wall of the valve cavity 15; the sliding rod is provided with a flow channel 18, one end of the flow channel 18 is communicated with the liquid inlet 12, and the other end is provided with a ball socket opening communicated with the liquid outlet 13; the ball 4 is placed in a free state between the liquid outlet 13 and the ball socket opening and is oppositely arranged with the ball socket opening; the shape of the ball socket opening matches the outer shape of the ball 4;

[0039] The end of the driving rod close to the sliding rod is sleeved with a spring 5, and the other end is sleeved with an electromagnetic coil 6; wherein, the end of the valve body 2 away from the liquid outlet 13 is provided with a buffer cavity 16, the driving rod is installed in the buffer cavity 16, and one end of the buffer cavity 16 is sealed by a nut 8; the electromagnetic coil 6 is sleeved outside the buffer cavity 16; a limiting end face is arranged in the valve cavity 15, one end of the spring 5 abuts against the end face of the sliding rod, and the other end abuts against the limiting end face. After the electromagnetic coil 6 is energized, a magnetic force acts on the driving rod together with the spring 5, the sliding rod slides, so that the ball socket opening is in contact or separated from the ball 4; when the ball socket opening is in contact with the ball 4, the flow channel 18 is closed, and when the ball socket opening is separated from the ball 4, the flow channel 18 is opened.

[0040] In this embodiment, the valve rod 3 is an integral structure, that is, the sliding rod and the driving rod are integrally machined and formed.

[0041] The liquid outlet 13 is provided with a beam 17 which divides the liquid outlet 13 into two parts, and the beam 17 prevents the ball 4 from being taken out.

[0042] The electromagnetic coil 6 is wrapped with a ferrite magnetic conductor 11 to increase the magnetic force of the electromagnetic coil 6 and protect the electromagnetic coil 6. The electromagnetic coil 6 is sleeved on the valve body 2, and a heat insulation and shock absorption washer 7 is arranged between the electromagnetic coil 6 and the valve body 2.

[0043] In the embodiment, the valve interface 1 is sleeved on the valve body 2 and communicates with the liquid inlet 12. The gasket 9 is arranged between the valve interface 1 and the valve body 2. The valve body 2 is provided with an external thread 14, and the locking nut 10 is sleeved on the external thread 14 and fixes the valve interface 1 on the valve body 2.

[0044] In the embodiment, the ball socket opening is eccentrically arranged, and the ratio of the diameter of the ball 4 to the eccentric distance from the ball center of the ball socket opening to the center line of the sliding rod is selected in the range of 9.5-10. In the embodiment, the diameter of the ball 4 is 3.8 mm, and the eccentricity is 0.38 mm, that is, the ratio of the diameter to the eccentricity is 10. The contact surface between the ball socket opening and the surface of the ball 4 is 9.6 square millimeters, which is less than half of the spherical surface area of the ball 4.

[0045] A use method of the electromagnetic valve in the embodiment includes two processes of opening and closing of the electromagnetic valve.

[0046] The opening process is that direct current is supplied to the electromagnetic coil 6 to make the valve rod 3 be pulled up by the magnetic force generated by the electromagnetic coil 6, the ball socket opening is separated from the ball 4, and the flow channel 18 is opened.

[0047] The closing process is that the direct current of the electromagnetic coil 6 is converted into pulsed alternating current with variable frequency. In the process from starting closing to complete closing, the frequency of the pulsed alternating current is gradually increased, the direction of the magnetic force generated by the electromagnetic coil 6 is quickly reciprocatingly switched, the valve rod 3 generates high-frequency vibration in the closing process, and the high-frequency vibration is used to remove dirt between the ball socket opening and the ball 4. Then, the pulse width is gradually reduced to 0% to make the ball socket opening completely adhere to the ball 4. When closing, the electromagnetic coil is converted from direct current into pulsed alternating current, the initial frequency is 1-5 kHz, the pulse width is 20-50%, and then the frequency is gradually increased to 15-22 kHz, and the pulse width is kept unchanged in the frequency increasing process. The time of the frequency increasing process is 2-6 s, the pulse width is gradually reduced to 0% in 3-5 s after the highest frequency is kept for 1-3 s.

[0048] In this embodiment, when closing, the electromagnetic coil 6 is converted from direct current to pulsed alternating current, the initial frequency is 1 kHz, the pulse width is 50%, and then the frequency is gradually increased to 22 kHz within 4 s, the pulse width remains unchanged during the frequency increasing process, and after maintaining 22 kHz for 3 s, the pulse width is gradually reduced to 0% within 3.5 s.

[0049] During the closing process, large particles will not enter the smaller slit and will be blocked, and small dirt will pass through with the water flow. Since the valve rod 3 is slowly closed and the slit is gradually reduced, dirt larger than the slit will be gradually blocked, and only a few may be caught in the slit, such as Figure 3 、 4 As shown, when hard impurities are caught in the contact surface, it will cause the closure to be not tight. Since the ball socket opening is eccentrically arranged, when liquid leaks, it will cause single-sided flow on the ball surface. According to Bernoulli's law, the water flow will make the ball rotate, and the direction of the ball rotation is not determined, but is determined according to the position of the inclusion. The water flow of the inclusion gap will be very high, the water flow will drive the ball to rotate and impact the impurities to make them discharge. These impurities will finally be impacted and removed by high-frequency vibration, and will not cause the valve to be closed badly.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, and they should be included in the scope of the claims of the present application.

Claims

1. A solenoid valve, characterized in that: It includes a valve body, a valve stem, and a ball. The valve body has a valve cavity, and the valve stem and the ball are both disposed in the valve cavity. The valve cavity has an inlet at one end and an outlet at the other end; the valve stem includes a sliding rod and a driving rod fixedly connected to each other; the sliding rod is located between the inlet and the outlet and slides to seal against the inner wall of the valve cavity; the sliding rod has a flow channel, one end of which communicates with the inlet and the other end of which has a ball-and-socket opening that communicates with the outlet. The sphere is positioned between the liquid outlet and the ball socket opening, and is opposite to the ball socket opening; the shape of the ball socket opening matches the shape of the sphere. A spring is fitted at one end of the drive rod near the sliding rod, and an electromagnetic coil is fitted at the other end. When the electromagnetic coil is energized, it works together with the spring to drive the drive rod, causing the sliding rod to slide, thereby allowing the ball socket opening to fit or separate from the ball. When the ball socket opening fits with the ball, the flow channel is closed; when the ball socket opening separates from the ball, the flow channel is open. The ball is placed freely in the valve cavity; the ball socket opening is eccentrically set, and the ratio of the diameter of the ball to the eccentric distance from the center of the ball socket opening to the center line of the sliding rod is 9.5~10; the contact area between the ball socket opening and the ball does not exceed half of the spherical surface area of ​​the ball; When the solenoid valve is closed, a variable frequency pulsating alternating current is supplied to the solenoid coil, causing the direction of the magnetic force generated by the solenoid coil to switch rapidly back and forth. This causes the valve stem to vibrate at high frequency during the closing process, thereby removing dirt between the ball socket opening and the ball.

2. The solenoid valve according to claim 1, characterized in that: The outlet is provided with a crossbeam that divides it into two parts, and the crossbeam is used to prevent the ball from falling out.

3. The solenoid valve according to claim 1, characterized in that: The electromagnetic coil is wrapped with a ferrite core to increase the magnetic force of the electromagnetic coil and protect it.

4. The solenoid valve according to claim 1, characterized in that: The electromagnetic coil is mounted on the valve body, and a heat-insulating and shock-absorbing washer is provided between the electromagnetic coil and the valve body.

5. The solenoid valve according to claim 1, characterized in that: It also includes a valve interface, which is fitted onto the valve body and communicates with the liquid inlet.

6. The solenoid valve according to claim 1, characterized in that: The valve body has a buffer cavity at one end away from the liquid outlet, and the drive rod is located in the buffer cavity; the electromagnetic coil is fitted outside the buffer cavity; the valve cavity has a limiting end face, one end of the spring abuts against the end face of the sliding rod, and the other end abuts against the limiting end face.

7. A method of using the solenoid valve according to any one of claims 1 to 6, characterized in that: This includes two processes: opening and closing the solenoid valve. The opening process is as follows: During the opening process, DC current is applied to the electromagnetic coil, and the magnetic force generated by the electromagnetic coil pulls up the valve stem, separating the ball socket opening from the ball and opening the flow channel; The closing process is as follows: During closing, the direct current of the electromagnetic coil is converted into a variable frequency pulsating alternating current. From the start of closing to the complete closing process, the frequency of the pulsating alternating current gradually increases. The magnetic force generated by the electromagnetic coil causes the valve stem to vibrate at high frequency. The high frequency vibration is used to remove dirt between the ball socket opening and the ball. Then the pulse width is gradually reduced to 0% so that the ball socket opening and the ball are completely in contact.

8. The method of using the solenoid valve according to claim 7, characterized in that: When closed, the electromagnetic coil is converted from direct current to pulsating alternating current, with an initial frequency of 1~5kHz and a pulse width of 20~50%, and then the frequency is gradually increased to 15~22kHz, while the pulse width remains constant during the frequency increase; the frequency increase process takes 2~6 seconds, and after maintaining the highest frequency for 1~3 seconds, the pulse width gradually decreases to 0% within 3~5 seconds.

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