Solenoid valve

Abstract

The utility model belongs to the field of valves, and particularly relates to an electromagnetic valve which comprises a gasket, an elastic piece, a mounting plate and a valve body. The valve body comprises a shell, a valve seat and an electromagnetic control part, the electromagnetic control part is arranged in the shell, a first flow channel and a second flow channel are arranged in the valve seat, and the outer end of the first flow channel and the outer end of the second flow channel are communicated with the outside; the electromagnetic control part is used for connecting or disconnecting the inner end of the first flow channel and the inner end of the second flow channel; the valve seat is installed between the installation plate and the axial end of the shell, a containing hole is formed in the side, close to the installation plate, of the valve seat, the gasket and the elastic piece are arranged in the containing hole, the gasket is located on the side, away from the installation plate, of the elastic piece, and the elastic piece abuts against the position between the installation plate and the gasket and is compressed. Force close to the electromagnetic control part is applied to the valve seat through elasticity of the elastic piece, and even if the valve seat deforms under high temperature and high pressure, the valve seat deforms towards the direction close to the sealing face of the electromagnetic control part.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a solenoid valve. Background Art

[0002] Solenoid valves are industrial equipment controlled by electromagnetics. They are basic components for controlling fluids. They are actuators and are not limited to hydraulic or pneumatic. Solenoid valves are used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium.

[0003] When the solenoid valve is used in a high temperature and high pressure environment with a fluid temperature of up to 175°C and a fluid pressure of up to 1.5MPa, the valve seat of the solenoid valve will inevitably produce creep (slow and permanent deformation of solid materials under stress), thereby shortening the service life of the solenoid valve. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a solenoid valve in view of the problem that the valve seat of the existing solenoid valve will inevitably produce creep in a high temperature and high pressure environment, thereby shortening the service life of the solenoid valve.

[0005] In order to solve the above technical problems, the embodiment of the utility model provides a solenoid valve, including a gasket, a spring, a mounting plate and a valve body; the valve body includes a shell, a valve seat and an electromagnetic control part, the electromagnetic control part is arranged in the shell, a first flow channel and a second flow channel are arranged in the valve seat, and the outer end of the first flow channel and the outer end of the first flow channel are communicated with the outside; the electromagnetic control part is used for connecting or blocking the inner end of the first flow channel and the inner end of the second flow channel;

[0006] The valve seat is installed between the mounting plate and one axial end of the housing. A receiving hole is provided on a side of the valve seat close to the mounting plate. The gasket and the spring sheet are arranged in the receiving hole. The gasket is located on a side of the spring sheet away from the mounting plate. The spring sheet abuts between the mounting plate and the gasket and is compressed.

[0007] Optionally, a conversion groove is provided on one side of the valve seat close to the electromagnetic control part, and the inner end of the first flow channel and the inner end of the second flow channel are respectively connected to the bottom wall of the conversion groove;

[0008] A sealing surface is provided on the side of the electromagnetic control part facing the mounting plate. When the sealing surface is in contact with the bottom wall of the conversion groove, the inner end of the first flow channel and the inner end of the second flow channel are blocked. When the sealing surface is separated from the bottom wall of the conversion groove, the inner end of the first flow channel and the inner end of the second flow channel are connected through the conversion groove.

[0009] Optionally, the spring sheet and the gasket are annular, a positioning column is provided in the accommodating hole, and the spring sheet and the gasket are sleeved on the positioning column.

[0010] Optionally, the electromagnetic control unit includes a spring, a static iron, a coil frame, a coil and a moving iron assembly, the coil is wound around the outer circumference of the coil frame, the static iron is fixed in the coil frame, an accommodating hole is provided at one end of the static iron close to the mounting plate, and the spring is arranged in the accommodating hole;

[0011] The moving iron assembly includes a diaphragm, a diaphragm frame and a moving iron. The moving iron is slidably arranged in the coil frame and is located on the side of the static iron close to the mounting plate. The spring abuts between the bottom wall of the accommodating hole and one end of the moving iron. The diaphragm frame is fixed to the other end of the moving iron. The diaphragm is fixed on the diaphragm frame and is located in the conversion groove. The sealing surface is formed on the side surface of the diaphragm facing the mounting plate.

[0012] Optionally, the valve body further includes an end cover; the shell has an inner cavity with two ends open, and the end cover and the valve seat are respectively arranged at two ends of the shell;

[0013] One end of the coil frame away from the mounting plate is fixed on the end cover.

[0014] Optionally, the electromagnetic control part further includes an elastic buffer sheet, and the buffer sheet is arranged between the diaphragm and an end surface of the moving iron on one axial side close to the mounting plate.

[0015] Optionally, the moving iron assembly further comprises a sleeve, the sleeve is press-fitted into the coil frame, and the inner wall of the sleeve is in sliding contact with the outer peripheral surface of the moving iron.

[0016] Optionally, the end cover has an empty cavity opening toward the static iron; the valve body further comprises a PWM modulator, the PWM modulator is disposed in the empty cavity and electrically connected to the coil;

[0017] It also includes an isolation pad, which is arranged between the static iron and the PWM modulator.

[0018] Optionally, the diaphragm includes a sealing platform and a ring edge, wherein the ring edge is arranged around the sealing platform, the outer edge of the ring edge fits the side wall of the conversion groove, the thickness of the ring edge is smaller than the depth of the conversion groove, the sealing platform protrudes from the surface of the ring edge away from the moving iron, and the surface of the sealing platform away from the moving iron constitutes the sealing surface.

[0019] Optionally, the diaphragm skeleton comprises a threaded rod, a first column and a second column sequentially connected along the axis of the moving iron, and the diameter of the first column is smaller than the diameters of the second column and the threaded rod;

[0020] The diaphragm is provided with a connecting hole, and the connecting hole includes a first hole segment and a second hole segment connected along the axis of the moving iron, the diameter of the first hole segment is smaller than the diameter of the second hole segment, and the moving iron is provided with a threaded hole, the threaded rod is threadedly connected to the threaded hole, the first column is penetrated by the first hole segment, and the second column is accommodated in the second hole segment.

[0021] According to the solenoid valve of the embodiment of the utility model, a receiving hole is opened in the valve seat, a gasket and a spring are installed in the receiving hole, and the elasticity of the spring is used to apply a force close to the electromagnetic control part to the valve seat. Even if the valve seat is deformed under high temperature and high pressure, the valve seat will be deformed towards the sealing surface close to the electromagnetic control part under the action of the spring, thereby increasing the chance of sealing contact between the valve seat and the electromagnetic control part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 An overall schematic diagram of a solenoid valve provided in one embodiment of the utility model;

[0023] Figure 2 A half-section schematic diagram of a solenoid valve provided in one embodiment of the utility model;

[0024] Figure 3 An exploded schematic diagram of a solenoid valve provided in one embodiment of the utility model.

[0025] The figure marks in the specification are as follows: 1. mounting plate; 2. valve seat; 21. first flow channel; 22. second flow channel; 23. conversion groove; 24. receiving hole; 25. gasket; 26. spring; 27. positioning column; 3. diaphragm; 31. sealing platform; 32. ring edge; 33. sealing surface; 4. diaphragm frame; 41. threaded rod; 42. first column; 43. second column; 5. moving iron; 51. threaded hole; 6. static iron; 61. receiving hole; 71. coil frame; 711. bobbin; 712. first limit ring plate; 713. second limit ring plate; 72. coil; 73. sleeve; 8. spring; 91. housing; 92. end cover; 93. PWM modulator; 94. vacant cavity; 95. buffer plate; 96. isolation pad. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0027] like Figures 1 to 3 As shown, an embodiment of the utility model provides a solenoid valve, including a gasket 25, a spring 26, a mounting plate 1 and a valve body; the valve body includes a housing 91, a valve seat 2 and an electromagnetic control unit, the electromagnetic control unit is arranged in the housing 91, a first flow channel 21 and a second flow channel 22 are arranged in the valve seat 2, and the outer end of the first flow channel 21 and the outer end of the first flow channel 21 are communicated with the outside; the electromagnetic control unit is used for connecting or blocking the inner end of the first flow channel 21 and the inner end of the second flow channel 22;

[0028] The valve seat 2 is installed between the mounting plate 1 and one axial end of the outer shell 91. A receiving hole 24 is provided on the side of the valve seat 2 close to the mounting plate 1. The gasket 25 and the spring sheet 26 are provided in the receiving hole 24. The gasket 25 is located on the side of the spring sheet 26 away from the mounting plate 1. The spring sheet 26 abuts between the mounting plate 1 and the gasket 25 and is compressed.

[0029] As mentioned in the background technology, when the material is at high temperature or near the melting point for a long time, the creep will be more severe. The creep rate often increases with the increase of temperature. Therefore, in this embodiment, a receiving hole 24 is opened at the bottom of the valve seat 2, and a gasket 25 and a spring 26 are added to generate an upward flexible force on the valve seat 2 to offset part of the pressure of the spring 8 in the electromagnetic control unit on the valve seat 2, and also to a certain extent, a force close to the sealing surface 33 is applied to the inside of the valve seat 2. This design can reduce the dimensional change of the valve seat 2 caused by temperature. Even at high temperature, the valve seat 2 is as close to the sealing surface 33 as possible to reduce the probability of leakage and extend the service life of the valve seat 2.

[0030] As an example, the spring piece 26 and the gasket 25 are annular, a positioning column 27 is provided in the accommodating hole 24, and the spring piece 26 and the gasket 25 are sleeved on the positioning column 27. In this embodiment, the positioning column 27 and the valve seat 2 are integrally formed, and the positioning column 27 facilitates the installation of the annular gasket 25 and the spring piece 26, and limits the expansion and contraction direction of the spring piece 26 to a certain extent, reducing the radial random deformation of the spring piece 26 toward the positioning column 27.

[0031] As an example, a conversion groove 23 is provided on one side of the valve seat 2 close to the electromagnetic control part, and the inner ends of the first flow channel 21 and the second flow channel 22 are respectively connected to the bottom wall of the conversion groove 23. A sealing surface 33 is provided on the side of the electromagnetic control part facing the mounting plate 1. When the sealing surface 33 is in contact with the bottom wall of the conversion groove 23, the inner ends of the first flow channel 21 and the second flow channel 22 are blocked. When the sealing surface 33 is separated from the bottom wall of the conversion groove 23, the inner ends of the first flow channel 21 and the second flow channel 22 are connected through the conversion groove 23.

[0032] Specifically, the electromagnetic control part includes a spring 8, a static iron 6, a coil 72 frame 71, a coil 72 and a moving iron 5 assembly, the coil 72 is wound on the outer periphery of the coil 72 frame 71, the static iron 6 is fixed in the coil 72 frame 71, and an accommodating hole 61 is provided at one end of the static iron 6 close to the mounting plate 1, and the spring 8 is arranged in the accommodating hole 61; the coil frame 71 includes a bobbin 711, a first limiting ring plate 712 and a second limiting ring plate 713, the bobbin 711 is a cylindrical structure with openings at both ends, the first limiting ring plate 712 and the second limiting ring plate 713 are fixed at both ends of the bobbin 711, the first limiting ring plate 712 and the second limiting ring plate 713 are arranged in parallel and spaced apart, the coil 72 is wound on the bobbin 711 between the first limiting ring plate 712 and the second limiting ring plate 713, and the first limiting ring plate 712 is arranged above the second limiting ring plate 713.

[0033] The moving iron 5 assembly includes a diaphragm 3, a diaphragm 3 frame and a moving iron 5. The moving iron 5 is slidably arranged in the coil 72 frame 71 and is located on the side of the static iron 6 close to the mounting plate 1. The spring 8 abuts between the bottom wall of the accommodating hole 61 and one end of the moving iron 5. The diaphragm 3 frame is fixed to the other end of the moving iron 5. The diaphragm 3 is fixed on the diaphragm 3 frame and is located in the conversion groove 23. The edge of the diaphragm 3 is fitted with the side wall of the conversion groove 23. The diaphragm 3 can slide in the conversion groove 23. The sealing surface 33 is formed on the side surface of the diaphragm 3 facing the mounting plate 1.

[0034] In the power-off state, the second flow channel 22 is always connected to the first flow channel 21, but the sealing surface 33 of the moving iron 5 is in contact with the bottom wall of the conversion slot 23, so that the first flow channel 21 and the conversion slot 23 are not connected. When the coil 72 is energized, the magnetism generated drives the moving iron 5 to move upward, and the diaphragm 3 connected to the moving iron 5 through the diaphragm 3 skeleton moves upward accordingly, thereby connecting the first flow channel 21 and the conversion slot 23. The conversion slot 23 is always connected to the second flow channel 22, and the gas enters the conversion slot 23 from the first flow channel 21, and then enters the second flow channel 22.

[0035] As an example, the movable iron 5 assembly further includes a sleeve 73, which is press-fitted into the coil 72 frame 71, and the inner wall of the sleeve 73 is in sliding contact with the outer peripheral surface of the movable iron 5. The sleeve 73 is generally a cylindrical copper sleeve.

[0036] In the frequent operation of the solenoid valve, if the sleeve is not provided, the moving iron 5 will contact the coil frame 71, thereby generating friction. The most serious thing is that when doing the life test, when running 3 million times, too much debris is generated due to the friction of the coil frame 71, so that the solenoid valve cannot be completely attracted. Therefore, in this embodiment, the sleeve is embedded in the coil frame 71, and the friction between the moving iron 5 and the sleeve replaces the friction between the moving iron 5 and the coil frame 71. After experiments, this effect is still very significant. Under the same life, the debris is greatly reduced and the life is extended.

[0037] As an example, the electromagnetic control unit further includes an elastic buffer sheet 95 , and the buffer sheet 95 is disposed between the diaphragm 3 and an axial end surface of the moving iron 5 close to the mounting plate 1 .

[0038] Reference Figure 2 and Figure 3 A buffer sheet 95 is added between the moving iron 5 and the diaphragm 3. One reason is to make the magnetic circuit area between the housing 91 and the moving iron 5 larger, and the other is to reduce the size of the solenoid valve. During the life test, it was found that even if there is a certain gap between the moving iron 5 and the diaphragm 3, the diaphragm 3 will still contact the moving iron 5. In the life test, when the action is repeated for 3 million times, the contact part between the diaphragm 3 and the moving iron 5 shows signs of wear, and there will be a risk of leakage. Therefore, a rubber buffer sheet 95 is added between the two to fill the gap between the moving iron 5 and the diaphragm 3. In this way, there is no wear when the life test is done again, and the life is greatly improved.

[0039] As an example, the valve body further includes an end cover 92; the housing 91 has an inner cavity with two ends open, the end cover 92 and the valve seat 2 are respectively arranged at two ends of the housing 91, and the end of the coil 72 frame 71 away from the mounting plate 1 is fixed to the end cover 92. Figure 2 The housing 91 is cylindrical, the end cover 92 is arranged at the upper end opening of the housing 91, and the end cover 92 and the valve seat 2 are connected by bolts. The valve seat 2 is arranged at the lower end of the housing 91, and the mounting plate 1 is arranged at the lower end of the valve seat 2 and connected to the valve seat 2 by bolts.

[0040] As an example, the end cover 92 has an empty cavity 94 opening toward the stationary iron 6; the valve body also includes a PWM modulator 93, which is arranged in the empty cavity 94 and is electrically connected to the coil 72; and also includes an isolation pad 96, which is arranged between the stationary iron 6 and the PWM modulator 93.

[0041] The solenoid valve at normal temperature and pressure can be operated immediately after being energized. However, in this embodiment, because the solenoid valve is in an environment of high temperature and high pressure, the force of the spring 8 itself is greater than that at normal temperature. The solenoid valve needs a large electromagnetic force to overcome the spring force in order to operate. This inevitably causes the power of the solenoid valve to increase, and the solenoid valve is kept in the attracted state for a long time with this power. The temperature of the solenoid valve rises very quickly, and the risk of damage to the enameled wire on the coil 72 is greatly increased, and the instability and risk increase sharply. Taking this into account, this embodiment combines the characteristics of the electromagnetic force and deliberately adds a PWM modulator 93. As we all know, the air gap is an important factor affecting the electromagnetic force. At the moment when the solenoid valve is energized, the electromagnetic force and The electromagnetic force when fully attracted differs by more than ten times, which means that we only need the electromagnetic force of the solenoid valve for a moment when it is energized to overcome the force of the spring 8, and we do not need such a large electromagnetic force when it is fully attracted. Therefore, based on this feature, a PWM modulator 93 is added, which does not take effect when the solenoid valve is energized to fully attracted. When it is fully attracted, an action time is set, which can be 200ms. After this time, the PWM modulator 93 controls the solenoid valve to reduce the voltage and power, but the solenoid valve can still remain attracted. The benefits of this effect are obvious. The temperature is reduced from 85°C to 55°C, and the power is reduced to 1 / 10 of the previous value, without affecting the normal operation of the solenoid valve.

[0042] Reference Figure 2 As an example, the diaphragm 3 includes a sealing platform 31 and an annular edge 32. The annular edge 32 is arranged around the sealing platform 31. The outer edge of the annular edge 32 fits the side wall of the conversion groove 23. The thickness of the annular edge 32 is less than the depth of the conversion groove 23. The sealing platform 31 protrudes from the surface of the annular edge 32 away from the moving iron 5, and the surface of the sealing platform 31 away from the moving iron 5 constitutes the sealing surface 33.

[0043] As an example, the skeleton of the diaphragm 3 includes a threaded rod 41, a first column 42 and a second column 43 sequentially connected along the axis of the moving iron 5, and the diameter of the first column 42 is smaller than the diameters of the second column 43 and the threaded rod 41;

[0044] The diaphragm 3 is provided with a connecting hole, and the connecting hole includes a first hole section and a second hole section connected along the axis of the moving iron 5, the diameter of the first hole section is smaller than the diameter of the second hole section, and the moving iron 5 is provided with a threaded hole 51, the threaded rod 41 is threadedly connected to the threaded hole 51, the first column 42 is penetrated by the first hole section, and the second column 43 is accommodated in the second hole section.

[0045] The electromagnetic valve of the embodiment of the utility model has the following working principle: the second flow channel 22 is always connected to the conversion slot 23. When the power is off, the spring 8 generates a downward force to press the movable iron 5, so that the sealing surface 33 on the diaphragm 3 contacts the valve seat 2, thereby achieving sealing. After the electromagnetic valve is energized, the electromagnetic component generates an electromagnetic force to attract the movable iron 5 to move upward, so that the movable iron 5 drives the diaphragm 3 to separate from the sealing surface 33. During the upward movement of the movable iron 5, the downward force generated by the spring 8 is overcome until the movable iron 5 and the stationary iron 6 are completely attracted, and the first end of the first flow channel 21 is completely opened and connected to the conversion slot 23.

[0046] In other embodiments, the diaphragm skeleton 4 is in a rod shape and is connected to the diaphragm 3 by bonding, bolts, or the like.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A solenoid valve, characterized in that: It includes a gasket, a spring, a mounting plate and a valve body; the valve body includes a shell, a valve seat and an electromagnetic control part, the electromagnetic control part is arranged in the shell, a first flow channel and a second flow channel are arranged in the valve seat, and the outer end of the first flow channel and the outer end of the first flow channel are communicated with the outside; the electromagnetic control part is used for connecting or blocking the inner end of the first flow channel and the inner end of the second flow channel; The valve seat is installed between the mounting plate and one axial end of the housing. A receiving hole is provided on a side of the valve seat close to the mounting plate. The gasket and the spring sheet are arranged in the receiving hole. The gasket is located on a side of the spring sheet away from the mounting plate. The spring sheet abuts between the mounting plate and the gasket and is compressed.

2. The solenoid valve according to claim 1, characterized in that: A conversion groove is provided on one side of the valve seat close to the electromagnetic control part, and the inner end of the first flow channel and the inner end of the second flow channel are respectively connected to the bottom wall of the conversion groove; A sealing surface is provided on the side of the electromagnetic control part facing the mounting plate. When the sealing surface is in contact with the bottom wall of the conversion groove, the inner end of the first flow channel and the inner end of the second flow channel are blocked. When the sealing surface is separated from the bottom wall of the conversion groove, the inner end of the first flow channel and the inner end of the second flow channel are connected through the conversion groove.

3. The solenoid valve according to claim 1, characterized in that: The spring piece and the gasket are annular, a positioning column is arranged in the accommodating hole, and the spring piece and the gasket are sleeved on the positioning column.

4. The solenoid valve according to claim 2, characterized in that: The electromagnetic control part includes a spring, a static iron, a coil frame, a coil and a moving iron assembly, wherein the coil is wound around the outer circumference of the coil frame, the static iron is fixed in the coil frame, and an accommodating hole is provided at one end of the static iron close to the mounting plate, and the spring is arranged in the accommodating hole; The moving iron assembly includes a diaphragm, a diaphragm frame and a moving iron. The moving iron is slidably arranged in the coil frame and is located on the side of the static iron close to the mounting plate. The spring abuts between the bottom wall of the accommodating hole and one end of the moving iron. The diaphragm frame is fixed to the other end of the moving iron. The diaphragm is fixed on the diaphragm frame and is located in the conversion groove. The sealing surface is formed on the side surface of the diaphragm facing the mounting plate.

5. The solenoid valve according to claim 4, characterized in that: The valve body further includes an end cover; the shell has an inner cavity with two ends open, and the end cover and the valve seat are respectively arranged at two ends of the shell; One end of the coil frame away from the mounting plate is fixed on the end cover.

6. The solenoid valve according to claim 4, characterized in that: The electromagnetic control part further comprises an elastic buffer sheet, and the buffer sheet is arranged between the diaphragm and an end surface of the movable iron on one axial side close to the mounting plate.

7. The solenoid valve according to claim 4, characterized in that: The moving iron assembly further comprises a sleeve, which is press-fitted into the coil frame, and the inner wall of the sleeve is in sliding contact with the outer peripheral surface of the moving iron.

8. The solenoid valve according to claim 5, characterized in that: The end cover has an empty cavity opening toward the static iron; the valve body further comprises a PWM modulator, which is disposed in the empty cavity and electrically connected to the coil; It also includes an isolation pad, which is arranged between the static iron and the PWM modulator.

9. The solenoid valve according to claim 4, characterized in that: The diaphragm includes a sealing platform and a ring edge, wherein the ring edge is arranged around the sealing platform, the outer edge of the ring edge fits the side wall of the conversion groove, the thickness of the ring edge is less than the depth of the conversion groove, the sealing platform protrudes from the surface of the ring edge away from the moving iron, and the surface of the sealing platform away from the moving iron constitutes the sealing surface.

10. The solenoid valve according to claim 4, characterized in that: The diaphragm frame comprises a threaded rod, a first column and a second column connected in sequence along the axis of the moving iron, wherein the diameter of the first column is smaller than the diameters of the second column and the threaded rod; The diaphragm is provided with a connecting hole, and the connecting hole includes a first hole segment and a second hole segment connected along the axis of the moving iron, the diameter of the first hole segment is smaller than the diameter of the second hole segment, and the moving iron is provided with a threaded hole, the threaded rod is threadedly connected to the threaded hole, the first column is penetrated by the first hole segment, and the second column is accommodated in the second hole segment.

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