An axial flow high-frequency solenoid valve

Abstract

This invention relates to an axial flow high-frequency solenoid valve, comprising an outlet valve body, a valve core assembly, a housing, a coil, a coil frame, and an upper stop. The upper stop includes a housing connecting portion and a stop portion. A stop flow channel is provided within the upper stop, distributed within the housing connecting portion and the stop portion. The coil is wound around the outside of the coil frame, which is fitted over the outside of the stop portion. An outlet flow channel is provided within the outlet valve body, and a valve seat is provided at the input port of the outlet flow channel. The housing includes a main housing portion, which is fitted over the outside of the coil frame. One end of the main housing portion is sealed to the housing connecting portion, and the other end is sealed to the outlet valve body. The outlet flow channel communicates with the stop flow channel. The valve core assembly is located within the main housing portion and between the outlet valve body and the stop portion. The control coil is energized or de-energized to control the valve core assembly to open or close the outlet flow channel. The overall structure is compact and easy to install.

Description

Technical Field

[0001] This invention relates to an electromagnetic valve. Background Technology

[0002] With the continuous development of aircraft, more stringent requirements have been put forward for thermal protection systems. High-frequency solenoid valves are used in the fluid circuit system of aircraft as components for cutting off and regulating system flow, and are an important single product of the system.

[0003] The operating life and leakage of high-frequency solenoid valves are directly related to the stable operation of the entire aircraft fluid circuit. Furthermore, with the significant increase in aircraft speed, the requirements for weight and size are quite stringent, and existing solenoid valve products cannot meet the needs. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide an axial flow high-frequency solenoid valve with axial flow of the medium, which minimizes the weight and volume of the valve and facilitates its installation in the system.

[0005] The technical solution of this invention is:

[0006] An axial flow high-frequency solenoid valve includes an outlet valve body, a valve core assembly, a housing, a coil, a coil frame, and an upper stop.

[0007] The upper stop includes a housing connecting part and a stop part connected as one piece; the upper stop is provided with a stop flow channel, which is distributed in the housing connecting part and the stop part, and the output port is located on the end face of the stop part;

[0008] The coil is wound on the outside of the coil frame, and the coil frame is sleeved on the outside of the stop part;

[0009] The outlet valve body is provided with an outlet flow channel, and a valve seat is provided at the input port of the outlet flow channel;

[0010] The housing includes a main housing section, which is a cylindrical structure open at both ends; the main housing section is fitted over the outside of the coil frame, with one end sealed to the housing connection section and the other end sealed to the outlet valve body; the outlet flow channel is connected to the baffle flow channel.

[0011] The valve core assembly is located inside the main housing and between the outlet valve body and the stop section; the control coil is energized or de-energized to control the valve core assembly to open or close the outlet flow channel.

[0012] The aforementioned axial flow high-frequency solenoid valve also includes an inlet valve body and a filter screen;

[0013] The upper baffle also includes an inlet valve body connection part, which is located on the outer side of the housing connection part; the baffle flow channel extends into the inlet valve body connection part and the input end of the baffle flow channel is provided with a stepped filter screen mounting surface;

[0014] The end face of the inlet valve body is provided with a filter screen mounting boss that extends into the flow channel of the baffle, and the filter screen is stuck between the filter screen mounting surface and the filter screen mounting boss.

[0015] In the aforementioned axial flow high-frequency solenoid valve, the outlet flow channel and the stop flow channel are coaxially arranged.

[0016] In the aforementioned axial flow high-frequency solenoid valve, several bosses are provided on the end face of the stop portion.

[0017] In the aforementioned axial flow high-frequency solenoid valve, a through hole is provided on the side wall of the main housing, and a lead wire hole seat is provided on the outer side wall of the main housing corresponding to the position of the through hole. An electrical connector is installed in the lead wire hole seat, and the electrical connector and the coil are electrically connected by a wire.

[0018] In the aforementioned axial flow high-frequency solenoid valve, an annular baffle is provided on the inner wall of the main housing. The baffle extends radially toward the inner side of the main housing and is adjacent to the outlet valve body.

[0019] In the aforementioned axial flow high-frequency solenoid valve, a second sealing groove is provided on the side of the baffle facing the coil frame, and a first sealing groove is provided on the side of the housing connection part connected to the stop part. Sealing rings are provided in the first sealing groove and the second sealing groove.

[0020] In the aforementioned axial flow high-frequency solenoid valve, the valve core assembly includes a valve core base, an armature, an elastic spring, and a sealing block.

[0021] The valve core base is provided with a dovetail groove on the side facing the outlet valve body, and a valve core flow channel is provided on the side facing the stop part. Several connecting holes are provided on the side wall of the valve core flow channel to connect the valve core flow channel and the outlet flow channel.

[0022] The sealing block is installed in the dovetail groove and cooperates with the valve seat to open or close the outlet flow channel;

[0023] The armature is fixedly connected to the core substrate, and a medium flow channel is provided inside the armature, which is connected to the valve core flow channel.

[0024] The inner side of the elastic spring is fixedly connected to the valve core base and / or armature, and the outer side is fixed to the outlet valve body and / or housing;

[0025] When the coil is not energized, the sealing block is pressed tightly against the valve seat under the action of the elastic spring, closing the outlet flow channel; when the coil is energized, the valve core base and armature move together to the upward stop side, the sealing block separates from the valve seat, and the outlet flow channel is opened.

[0026] In the aforementioned axial flow high-frequency solenoid valve, two symmetrical rectangular grooves are provided along the axial direction on the outer cylindrical surface of the armature.

[0027] In the aforementioned axial flow high-frequency solenoid valve, the outlet valve body is provided with a valve cavity, which is located upstream of the outlet flow channel and the two are connected; the valve core base is located inside the valve cavity, and the armature extends into the coil frame.

[0028] The advantages of this invention compared to the prior art are:

[0029] 1. The valve core assembly adopts an integrated spring structure, which reduces the dynamic friction between the armature and the coil frame and minimizes the mass of the valve core assembly. At the same time, it reduces the eddy current loss of the electromagnet, improves the economy of the electromagnet, increases the valve's operating life, and shortens the valve's operating time, making it suitable for high-frequency and rapid operation.

[0030] 2. This invention can select different solutions for different working fluids, and has good versatility; when using non-conductive fluids, a fully welded structure can be adopted, which has high sealing reliability and is suitable for applications requiring long-term storage.

[0031] 3. The overall layout of this invention is an axial flow structure. The flow channel design minimizes the radial dimension of the armature, thereby significantly reducing the volume and weight of the solenoid valve. It makes full use of the internal space of the valve, resulting in a compact overall structure and convenient installation. Furthermore, the fluid flows through the electromagnet, which is beneficial for heat dissipation of the valve coil.

[0032] 4. This invention designs an elastic valve core assembly supported by an elastic spring and a valve seat with an R-shaped sealing surface, which facilitates the alignment of the valve core and the valve seat, ensures internal sealing, and improves the reliability of internal sealing.

[0033] 5. The soft magnetic materials of the magnetic circuit are all selected from materials with high resistivity and low coercivity, which further improves the valve response time and meets the requirements of high frequency and fast action. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of an axial flow high-frequency solenoid valve.

[0035] Figure 2 For is Figure 1 A magnified view of a portion of region D;

[0036] Figure 3 This is a schematic diagram of the valve core assembly.

[0037] Figure 4 for Figure 3 A magnified view of a portion of area A in the middle;

[0038] Figure 5 This is a schematic diagram of the armature structure;

[0039] Figure 6 This is a schematic diagram of the valve core substrate.

[0040] Figure 7 This is a schematic diagram of the upper stop iron structure;

[0041] Figure 8 This is a schematic diagram of the shell structure. Detailed Implementation

[0042] An axial flow high-frequency solenoid valve, such as Figure 1 As shown, it includes an outlet valve body 1, a valve core assembly 2, a housing 6, a coil frame 4, a coil 7, an upper stop 8, an inlet valve body 10, and an electrical connector 5.

[0043] like Figure 7 As shown, the upper stop 8 includes a housing connecting part 86, a stop part 85, and an inlet valve body connecting part 87; in order to facilitate processing and simplify the structure, the housing connecting part 86, the stop part 85, and the inlet valve body connecting part 87 are an integral structure.

[0044] The stop section 85 and the inlet valve body connecting section 87 are located on opposite end faces of the housing connecting section 86. A hole is made inside the upper stop section 8 to form a stop flow channel 81, which preferably extends axially. The input port of the stop flow channel 81 is located on the end face of the inlet valve body connecting section 87, and the output port is located on the end face of the stop section 85.

[0045] The inlet valve body connecting part 87 is fixedly connected to the inlet valve body 10, for example, by welding them together. The input end of the stop flow channel 81 is provided with a stepped filter screen mounting surface 82, and the end face of the inlet valve body 10 is provided with a filter screen mounting boss extending into the stop flow channel 81. The filter screen 9 is held between the filter screen mounting surface 82 and the filter screen mounting boss. The diameter of the filter screen mounting boss is larger than the inner flow channel diameter of the stop flow channel 81, thereby ensuring that the effective filtration area of ​​the filter screen 9 is larger than the main flow channel area of ​​the solenoid valve, reducing local flow resistance loss in the valve.

[0046] The coil 7 is wound around the coil frame 4, which is fitted around the outside of the stop part 85. The stop part 85 is made of soft magnetic material. When the coil 7 is energized, it generates electromagnetic attraction, which causes the valve core assembly 2 to move towards and engage with the stop part 85. The end face of the stop part 85 is provided with a boss 83, which ensures that after the stop part 85 and the valve core assembly 2 are engaged, a certain air gap is still maintained between them, reducing the valve closing response time. The number of bosses 83 can be set as needed, for example, three evenly distributed bosses 83 with a height of 0.1mm.

[0047] A first sealing groove 84 is provided on the end face where the housing connecting part 86 connects with the stop part 85 for installing the sealing ring 3.

[0048] The housing 6 is fitted over the outer side of the coil frame 4, with one end sealed to the housing connection part 86 and the other end sealed to the outlet valve body 1. Specifically, as shown... Figure 8 As shown, the housing 6 includes a main housing portion 64, which is a cylindrical structure with openings at both ends, preferably a cylindrical shape. The two openings of the main housing portion 64 are respectively fitted onto the outer sides of the housing connecting portion 86 and the outlet valve body 1, and are sealed together.

[0049] A through hole 66 is provided on the side wall of the main housing 64 for the coil 7 to be electrically connected to an external power source. Preferably, a lead-out hole seat 62 is provided on the outer side wall of the main housing 64 at the location corresponding to the through hole 66. An electrical connector 5 is installed in the lead-out hole seat 62, and the electrical connector 5 and the coil 7 are electrically connected by a wire. A mounting flange 63 is provided at one end of the main housing 64 for the installation of the entire valve. The mounting flange 63 is integral with the main housing 64.

[0050] An annular baffle 65 is provided on the inner wall of the main housing 64. The baffle 65 extends radially inward toward the inner side of the main housing 64 and is adjacent to the outlet valve body 1. One function of the baffle 65 is to fix and install the valve core assembly 2; another function of the baffle 65 is to provide a second sealing groove 61, in which a sealing ring 3 is provided to form a seal between the baffle 65 and the coil frame 4.

[0051] like Figure 2 As shown, the outlet valve body 1 is provided with a valve cavity 13 and an outlet flow channel 12. A valve seat 11 is provided between the valve cavity 13 and the outlet flow channel 12. The valve seat 11 is used to cooperate with the valve core assembly 2 to open or close the outlet flow channel 12.

[0052] Valve core assembly 2 is the actuating structure that realizes valve closing and opening. It must ensure a seal when closed and is the only moving component within the valve; its structure affects the valve's operating life. For example... Figure 3 and Figure 4 As shown, the valve core assembly 2 includes a valve core base 21, an armature 23, and an elastic spring 24. The valve core base 21 is as follows: Figure 6As shown, a dovetail groove 211 is machined on the left end, and a sealing block 22 is installed inside the dovetail groove 211. The sealing block 22 is made of non-metallic material and is fixed in the dovetail groove 211 by hot pressing or cold pressing. After installation, the sealing surface is ground to achieve the required surface condition and meet the valve's sealing requirements. The sealing end of the valve seat 11 is provided with an R-shaped sealing surface with a radius of 0.2mm to 0.3mm, which, in conjunction with the sealing block 22, can achieve a good sealing effect.

[0053] A valve core flow channel 212 is machined at the right end of the valve core base 21. The valve core flow channel 212 can communicate with the dovetail groove 211. Ideally, the valve core flow channel 212 can not communicate with the dovetail groove 211 to ensure the sealing effect of the valve core assembly 2. Several connecting holes 213 are machined on the side wall of the valve core flow channel 212 for the flow of the medium. The sum of the flow channel areas of the multiple connecting holes 213 should be greater than or equal to the flow diameter of the valve to reduce local resistance.

[0054] like Figure 5 As shown, the armature 23 is a hollow cylindrical structure with an axial medium flow channel 231 inside. Two symmetrical rectangular grooves 233 are arranged axially on the outer cylindrical surface to reduce eddy current losses in the electromagnet. A connecting platform 232 is provided at the end of the armature 23, extending into the valve core flow channel 212 to achieve an interference fit between the valve core base 21 and the armature 23. Simultaneously, a clamping elastic spring 24 is held between the valve core base 21 and the armature 23, and they are cold-pressed together at room temperature to form a single unit. The outer edge of the elastic spring 24 is fixed to the outlet valve body 1 and / or the housing 6; preferably, the outer edge of the elastic spring 24 is held between the end face of the outlet valve body 1 and the baffle 65. By replacing the traditional helical cylindrical spring with an elastic spring, the connection size and weight of the valve core assembly 2 can be greatly reduced. At the same time, the elastic spring 24 can support the valve core assembly, reduce the dynamic friction between the armature 23 and the inner hole of the coil frame 4, and greatly improve the valve's operating life.

[0055] When the coil 7 is not energized, the valve core base 21 blocks the outlet flow channel 12 under the action of the elastic spring 24; when the coil 7 is energized, the valve core base 21 and the armature 23 move together to the upward stop 8 side, opening the outlet flow channel 12.

[0056] When assembling the above-mentioned axial flow high-frequency solenoid valve,

[0057] First, the coil 7 is installed into the upper stop 8. Then, the housing 6 is fitted onto the outside of the coil frame 4 and welded to the upper stop 8. At the same time, epoxy resin with a small coefficient of expansion and high thermal conductivity is used to fix the coil 7, reducing the expansion and heat dissipation of the coil 7 under high and low temperatures. After installing the electrical connector 5, the electromagnet assembly is formed.

[0058] Install the valve core assembly 2 to the left end of the electromagnet assembly, install the filter screen 9 to the right end of the upper baffle 8, and initially fix it with the inlet valve body 10;

[0059] Install the outlet valve body 1 and adjust the working stroke between the valve core assembly 2 and the valve seat 11;

[0060] Finally, clamp both ends of all parts together and weld the upper stop 8 and the inlet valve body 10, as well as the housing 6 and the outlet valve body 1, to ensure sealing and structural strength.

[0061] In operation, the fluid flows through the stop flow channel 81, the medium flow channel 231, the valve core flow channel 212, and the connecting hole 213, finally exiting through the gap between the sealing block 22 and the valve seat 11. The stop flow channel 81, the medium flow channel 231, the valve core flow channel 212, and the outlet flow channel 12 are arranged on the same axis, resulting in a compact structure. Simultaneously, the medium flowing through the coil 7 carries away the heat generated during coil 7 operation, reducing the temperature rise of the solenoid valve. The entire valve core assembly 2 is supported by an elastic spring 24 after installation, which effectively reduces friction between the armature 23 and the inner hole of the coil frame 4, thereby improving the operating life of the solenoid valve and meeting the requirements of high-frequency, long-term operation.

[0062] Regarding the conductivity of the working fluid inside the solenoid valve, this technical solution allows for local adjustments, maximizing product versatility. When a non-conductive working fluid is flowing, it is allowed to enter the coil 7; therefore, the sealing ring 3 can be omitted, and the electrical connector 5 adopts a welded sealing type. The solenoid valve adopts an integral welded structure, significantly improving its sealing performance and achieving zero leakage. When a conductive working fluid is flowing, sealing rings 3 are installed between the coil frame 4 and the housing 6, and between the coil frame 4 and the upper stop 8, to provide a seal. Both sealing rings 3 work together to prevent the working fluid from entering the coil 7. In this case, either a sealed or non-sealed type of electrical connector 5 can be used.

[0063] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. An axial flow high-frequency solenoid valve, characterized in that: It includes an outlet valve body (1), a valve core assembly (2), a housing (6), a coil (7), a coil frame (4), and an upper stop (8); The upper stop (8) includes a housing connecting part (86) and a stop part (85) connected as one piece; the upper stop (8) is provided with a stop flow channel (81), which is distributed in the housing connecting part (86) and the stop part (85), and the output port is located on the end face of the stop part (85); The coil (7) is wound on the outside of the coil frame (4), and the coil frame (4) is fitted on the outside of the stop part (85); The outlet valve body (1) is provided with an outlet flow channel (12), and a valve seat (11) is provided at the input port of the outlet flow channel (12); The housing (6) includes a main housing part (64), which is a cylindrical structure with openings at both ends; the main housing part (64) is fitted on the outside of the coil frame (4), one end of which is sealed to the housing connection part (86), and the other end is sealed to the outlet valve body (1); the outlet flow channel (12) is connected to the baffle flow channel (81); The valve core assembly (2) is located inside the main housing (64) and between the outlet valve body (1) and the stop part (85); the control coil (7) is energized or de-energized to control the valve core assembly (2) to open or close the outlet flow channel (12).

2. The axial flow high-frequency solenoid valve according to claim 1, characterized in that: It also includes an inlet valve body (10) and a filter screen (9); The upper baffle (8) also includes an inlet valve body connection part (87), which is located on the outer side of the housing connection part (86); the baffle flow channel (81) extends into the inlet valve body connection part (87) and the input end of the baffle flow channel (81) is provided with a stepped filter screen mounting surface (82); The end face of the inlet valve body (10) is provided with a filter screen mounting boss that extends into the flow channel (81) of the baffle, and the filter screen (9) is stuck between the filter screen mounting surface (82) and the filter screen mounting boss.

3. An axial flow high-frequency solenoid valve according to claim 1 or 2, characterized in that: The outlet flow channel (12) and the barrier flow channel (81) are coaxially arranged.

4. The axial flow high-frequency solenoid valve according to claim 1, characterized in that: The end face of the stop part (85) is provided with a number of protrusions (83).

5. The axial flow high-frequency solenoid valve according to claim 1, characterized in that: A through hole (66) is provided on the side wall of the main shell (64), and a lead wire hole seat (62) is provided on the outer side wall of the main shell (64) corresponding to the position of the through hole (66). An electrical connector (5) is installed in the lead wire hole seat (62), and the electrical connector (5) and the coil (7) are electrically connected by a wire.

6. The axial flow high-frequency solenoid valve according to claim 1, characterized in that: The inner wall of the main housing (64) is provided with an annular baffle (65), which extends radially toward the inner side of the main housing (64) and is close to the outlet valve body (1).

7. An axial flow high-frequency solenoid valve according to claim 6, characterized in that: The baffle (65) has a second sealing groove (61) on the side facing the coil frame (4), and the housing connecting part (86) has a first sealing groove (84) on the side connecting the baffle part (85). A sealing ring (3) is provided in the first sealing groove (84) and the second sealing groove (61).

8. The axial flow high-frequency solenoid valve according to claim 1, characterized in that: The valve core assembly (2) includes a valve core base (21), an armature (23), an elastic spring (24), and a sealing block (22); The valve core base (21) has a dovetail groove (211) on the side facing the outlet valve body (1) and a valve core flow channel (212) on the side facing the stop part (85). The valve core flow channel (212) has several connecting holes (213) on its side wall to connect the valve core flow channel (212) and the outlet flow channel (12). The sealing block (22) is installed in the dovetail groove (211) and cooperates with the valve seat (11) to open or close the outlet flow channel (12); The armature (23) is fixedly connected to the valve core base (21), and a medium flow channel (231) is provided inside the armature (23), which is connected to the valve core flow channel (212); The inner side of the elastic spring (24) is fixedly connected to the valve core base (21) and / or armature (23), and the outer side is fixed to the outlet valve body (1) and / or housing (6); When the coil (7) is not energized, under the action of the elastic spring (24), the sealing block (22) is pressed against the valve seat (11), closing the outlet flow channel (12); when the coil (7) is energized, the valve core base (21) and armature (23) move together to the side of the upward stop (8), the sealing block (22) separates from the valve seat (11), and the outlet flow channel (12) is opened.

9. An axial flow high-frequency solenoid valve according to claim 8, characterized in that: The armature (23) has two symmetrical rectangular slots (233) arranged along the axial direction on its outer cylindrical surface.

10. An axial flow high-frequency solenoid valve according to claim 8, characterized in that: The outlet valve body (1) is provided with a valve cavity (13), which is located upstream of the outlet flow channel (12) and the two are connected; the valve core base (21) is located in the valve cavity (13), and the armature (23) extends into the coil frame (4).

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