Normally open electromagnetic valve

Abstract

The invention discloses a normally open solenoid valve which comprises a valve body part, a piston part, a first iron core part, a second iron core part and a valve sleeve part, the valve body part comprises a valve cavity, at least part of the piston part is located in the valve cavity, the valve sleeve part is fixedly connected with the valve body part, and the valve sleeve part comprises a valve sleeve pipe. The first iron core part and the second iron core part are located in a pipe cavity of the valve sleeve and are in sliding fit with the valve sleeve, the second iron core part is closer to the piston part in the longitudinal direction of the normally-open electromagnetic valve, the piston part is fixedly connected with the second iron core part, and the first iron core part and the second iron core part are located in the pipe cavity of the valve sleeve and are in sliding fit with the valve sleeve. The first iron core component comprises a first buffering component, the outer side wall of the first iron core component comprises a first annular groove, the first buffering component is partially located in the first annular groove, the first buffering component is annular, and the diameter of the outer side wall of the first buffering component is larger than that of the outer side wall of the first iron core component. The buffer component is arranged between the iron core component and the valve sleeve, so that collision between the iron core component and the valve sleeve can be avoided, and noise is reduced.

Description

Technical Field

[0001] This application relates to normally open solenoid valves for refrigeration and heat pump systems, and more specifically, to a normally open solenoid valve. Background Technology

[0002] Normally open solenoid valves are widely used in refrigeration systems to control the flow of refrigerant. A normally open solenoid valve is a type of solenoid valve that remains open when not energized and closes when energized. Figure 1 This is a cross-sectional schematic diagram of a normally open solenoid valve, as shown in the background art. Figure 1 As shown, the normally open solenoid valve includes a valve body component 1', a piston component 2', an iron core component, and a valve sleeve component 4'. The iron core component includes a first iron core 300' and a second iron core 310'. In the de-energized state, the normally open solenoid valve is in the open state. In the energized state, the first iron core 300' is attracted downward to the second iron core 310' under the action of electromagnetic force, and the normally open solenoid valve is in the closed state. When the valve is closed while energized, the piston component 2', the first iron core 300', and the second iron core 310' can be considered as a single unit. At this time, only the piston component 2' and the valve body component 1' have a guiding connection. If an AC coil is used, the current in the coil fluctuates, and the resulting electromagnetic force also fluctuates. This fluctuating electromagnetic force exerts a lateral component force on the integrated first iron core 300' and second iron core 310', causing them to vibrate and impact the valve sleeve component 4', generating noise. Therefore, how to improve noise reduction is a concern for those skilled in the art. Summary of the Invention

[0003] To address the above problems, this invention provides a normally open solenoid valve designed to reduce noise.

[0004] The technical solution adopted in the embodiments of the present invention is as follows:

[0005] A normally open solenoid valve includes a valve body component, a piston component, a first iron core component, a second iron core component, a valve sleeve component, and a buffer component. The valve body component includes a valve cavity, and the piston component is at least partially located in the valve cavity. The valve sleeve component is fixedly connected to the valve body component and includes a valve sleeve tube. The first iron core component and the second iron core component are located in the cavity of the valve sleeve tube and are slidably engaged with the valve sleeve tube. Along the longitudinal direction of the normally open solenoid valve, the second iron core component is closer to the piston component. The piston component is fixedly connected to the second iron core component. The first iron core component includes a first buffer component. The outer wall of the first iron core component includes a first annular groove, and the first buffer component is partially located in the first annular groove. The first buffer component is annular, and the diameter of the outer wall of the first buffer component is larger than the diameter of the outer wall of the first iron core component.

[0006] The normally open solenoid valve provided in this application includes a first buffer component in the first iron core component 3. The outer wall of the first iron core component 3 includes a first annular groove 320. The first buffer component 5 is partially located in the first annular groove 320. The first buffer component 5 is annular in shape. The diameter of the outer wall of the first buffer component 5 is larger than the diameter of the outer wall of the first iron core component 3. When the AC coil is turned on, there will be no impact between the first iron core component 3 and the valve sleeve component 4, thus reducing product noise.

[0007] Further: The first buffer component includes a first support and a first buffer. Along the radial direction of the first iron core component, the first buffer is closer to the valve sleeve. The first buffer is located between the first support and the sleeve. The diameter of the outer side wall of the first buffer is larger than the diameter of the outer side wall of the first iron core component. The outer side wall of the first buffer is in sliding engagement with the inner side wall of the valve sleeve.

[0008] Further: the first support member includes a first notch, the first buffer member includes a second notch, the outer side wall of the first support member abuts against the inner side wall of the first buffer member, the material of the first support member is a metal material, the material of the valve sleeve is stainless steel, the material of the first buffer member is a non-metallic material, and along the radial direction of the first iron core component, the first support member applies an elastic force to the first buffer member.

[0009] Further: the inner wall of the first buffer member includes a first mounting groove, the first support member is at least partially located in the first mounting groove, the outer wall of the first support member abuts against the bottom wall of the first mounting groove, and the inner wall of the first support member does not contact the bottom wall of the first annular groove.

[0010] Further: the second core component includes a second buffer component, the outer wall of the second core component includes a second annular groove, the second buffer component is partially located in the second annular groove, the second buffer component is annular, and the diameter of the outer wall of the second buffer component is larger than the diameter of the outer wall of the second core component.

[0011] Further: the second buffer component includes a second support and a second buffer. Along the radial direction of the second iron core component, the second buffer is closer to the valve sleeve. The second buffer is located between the second support and the valve sleeve. The diameter of the outer wall of the second buffer is larger than the diameter of the outer wall of the second iron core component. The outer wall of the second buffer slides with the inner wall of the valve sleeve.

[0012] Further: the second support member includes a third notch, the second buffer member includes a fourth notch, the outer sidewall of the second support member abuts against the inner sidewall of the second buffer member, the material of the second support member is a metallic material, the material of the first buffer member is a non-metallic material, and along the radial direction of the second iron core member, the second support member applies an elastic force to the second buffer member.

[0013] Further: the inner wall of the second buffer member includes a second mounting groove, the second support member is at least partially located in the second mounting groove, the outer wall of the second support member abuts against the bottom wall of the second mounting groove, and the inner wall of the second support member does not contact the bottom wall of the second mounting groove.

[0014] Furthermore: along the longitudinal direction of the normally open solenoid valve, the first annular groove is located on the outer wall of the upper half of the first iron core component, and the second annular groove is located on the outer wall of the upper half of the second iron core component.

[0015] Further: The valve body component includes a valve seat, a valve cover, and a nut sleeve. The nut sleeve is threadedly engaged with the valve seat and restricts the valve cover from disengaging from the valve seat. The valve sleeve component includes a valve sleeve cover. One end of the valve sleeve tube is fixedly engaged with the valve sleeve cover. The valve cover sleeve restricts the first iron core component from disengaging from the valve sleeve component. The other end of the valve sleeve tube is fixedly engaged with the valve cover. The piston component includes a pilot valve port, and the valve seat includes a main valve port. When the normally open solenoid valve is energized, the first iron core component attracts the second iron core component under the action of electromagnetic force and closes the pilot valve port, while the piston component closes the main valve port. Attached Figure Description

[0016] Figure 1 Background Art: A cross-sectional schematic diagram of a normally open solenoid valve;

[0017] Figure 2 This application provides a cross-sectional schematic diagram of a normally open solenoid valve;

[0018] Figure 3 : Figure 2 Enlarged schematic diagram of point I in the middle;

[0019] Figure 4a : Figure 3 A schematic diagram of the first buffer component;

[0020] Figure 4b : Figure 3 A schematic diagram of the first support component;

[0021] Figure 5 : Figure 2 Enlarged schematic diagram at point II;

[0022] Figure 6a : Figure 3 A schematic diagram of the second buffer component;

[0023] Figure 6b : Figure 3 A schematic diagram of the second support component;

[0024] Figure 7 : Figure 2 A cross-sectional view of the piston component.

[0025] Figures 1 to 7 The attached figures are labeled as follows:

[0026] 1-Valve body component, 100-Valve seat, 1010-Main valve port, 110-Valve cover, 120-Nut sleeve;

[0027] 2-Piston assembly, 200-Connecting section, 2010-Valve port, 210-Guide section, 2110 Piston ring assembly; 3-First core assembly, 320-First annular groove, 5-First buffer assembly, 500-First support member, 5001-First notch, 510-First buffer member, 5110-First mounting groove, 5101-Second notch;

[0028] 4-Valve sleeve assembly, 400-Valve sleeve tube, 410-Valve sleeve cover;

[0029] 6-Second core component, 620-Second annular groove, 5A-Second buffer component, 500A-Second support component, 5001A Third notch, 5110A Second mounting groove, 5101A Fourth notch. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The directional terms such as "up," "down," "vertical," and "horizontal" used herein are... Figure 1 The positions of the components shown are defined only for clarity and convenience in expressing the technical solution. It should be understood that the directional terms used herein should not limit the scope of protection claimed in this application.

[0031] like Figure 1As shown, the normally open solenoid valve in this embodiment includes a valve body component 1, a piston component 2, a first iron core component 3, a second iron core component 6, and a valve sleeve component 4. The valve body component 1 includes a valve cavity, and the piston component 2 is at least partially located within the valve cavity. The valve sleeve component 4 is fixedly connected to the valve body component 1 and includes a tubular valve sleeve tube 400. The first iron core component 3 and the second iron core component 6 are located within the cavity of the valve sleeve tube 400, and the first iron core component 3 and the second iron core component 6 are in sliding engagement with the valve sleeve tube 400. Along the longitudinal direction of the normally open solenoid valve, the second iron core component 6 is closer to the piston component 2; that is, the second iron core component 6 is located between the first iron core component 3 and the piston component 2. The piston component 2 is fixedly connected to the second iron core component 6. This fixed connection can be achieved by welding, riveting, or other methods. In this embodiment, the specific connection method is as follows: the piston component 2 includes external threads, and the second iron core component 6 includes internal threads. After the piston component 2 and the second iron core component 6 are threadedly connected, a specified tool is used to destroy part of the threaded mating section, thereby achieving mutual fixation between the piston component 2 and the second iron core component 6.

[0032] The first core component 3 includes a first buffer component 5. The outer wall of the first core component 3 includes a first annular groove 320, and a portion of the first buffer component 5 is located in the first annular groove 320. The first buffer component 5 is annular, and the diameter of the outer wall of the first buffer component 5 is larger than the diameter of the outer wall of the first core component 3. That is, the first buffer component 5 is fitted into the first annular groove 320, while a portion of the first buffer component 5 is exposed outside the first annular groove 320. With this arrangement, the outer diameter of the first buffer component 5 is larger than the outer diameter of the first core component 3, making the outer wall of the first buffer component 5 closer to the inner wall of the valve sleeve 400. Alternatively, the outer wall of the first buffer component 5 can abut against the inner wall of the valve sleeve 400.

[0033] Normally open solenoid valve, such as Figure 3 As shown, the first buffer component 5 includes a first support component 500 and a first buffer component 510. Along the radial direction of the first iron core component 3, the first buffer component 510 is closer to the valve sleeve 400, that is, the first buffer component 510 is located between the first support component 500 and the valve sleeve 400. The diameter of the outer wall of the first buffer component 510 is larger than the diameter of the outer wall of the first iron core component 3. The outer wall of the first buffer component 510 is in sliding engagement with the inner wall of the valve sleeve 400. This arrangement makes the outer wall of the first buffer component 510 closer to the inner wall of the valve sleeve 400. Of course, it is also possible that the outer wall of the first buffer component 510 abuts against the inner wall of the valve sleeve 400 and then slides in engagement.

[0034] like Figure 4a , Figure 4bAs shown, the first support member 500 includes a first notch 5001, and the first buffer member 510 includes a second notch 5101. The outer sidewall of the first support member 500 abuts against the inner sidewall of the first buffer member 510, and the first notch 5001 and the second notch 5101 are correspondingly provided. Here, "correspondingly provided" means that the first notch 5001 and the second notch 5101 are aligned accordingly, and the notch directions are consistent. The outer sidewall of the first support member 500 abuts against the inner sidewall of the first buffer member 510. The material of the first support member 500 is a metallic material, and the material of the first buffer member 510 is a non-metallic material. Along the radial direction of the first iron core member 3, the first support member 500 applies an elastic force to the first buffer member 501. In the specific implementation process, the first support member 500 is first installed into the first mounting groove 5110 of the first buffer member 510, and the first notch 5001 and the second notch 5101 are aligned with each other to assemble the first buffer member 5. The first buffer member 5 is then fitted into the first annular groove 320 of the first iron core member 3. When the first iron core member 3 with the first buffer member 5 installed is fitted into the valve sleeve 400, the notch is first tightened to reduce the outer diameter of the first buffer member 5. When the notch is tightened to the point that the first buffer member 5 can be smoothly fitted into the valve sleeve 400, the first support member 500 has an elastic force from the inner wall to the outer wall, ensuring that the outer wall of the first support member 500 abuts against the inner wall of the first buffer member 510. Then the elastic force of the first support member 500 is transmitted to the first buffer member 510, so that the outer wall of the first buffer member 510 also has an elastic force from the inside to the outside, thereby approaching the inner wall of the valve sleeve 400, or even abutting against the inner wall of the valve sleeve 400. The first notch 5001 and the second notch 5101 are respectively provided so that the first support member 500 and the first buffer member 510 can make full contact, ensuring that the elastic force of the first support member 500 is fully effective and evenly transmitted to the first buffer member 510.

[0035] Optionally, along the longitudinal direction of the normally open solenoid valve, the cross-section of the first support member 500 is circular, rectangular, or arc-shaped, and the cross-section of the first buffer member 510 is rectangular or arc-shaped. Specifically, if the cross-section of the first support member 500 is circular, it means that the first support member 500 is a C-shaped metal wire ring with a notch; if the cross-section of the first support member 500 is rectangular, it means that the first support member 500 is a C-shaped metal ring with a notch; if the cross-section of the first support member 500 is arc-shaped, it means that the first support member 500 is a C-shaped arc-shaped metal ring with a notch. In this embodiment, the first support member 500 is a C-shaped metal wire with a notch, made of an elastic metal material, and the first buffer member 510 is a C-shaped rectangular ring with a notch, made of a polymer material with wear-resistant properties, such as rubber, PPS, PTFE, etc. The elastic metal material ensures sufficient elastic force, while the wear-resistant polymer material plays a role in wear resistance and vibration reduction, improving the service life of the product.

[0036] It should be further explained that there is a gap between the outer diameter of the first iron core component 3 and the inner diameter of the valve sleeve 400. Although this gap is small, as long as there is a gap, collision noise will be generated once the outer wall of the first iron core component 3 collides with the inner wall of the valve sleeve 400. During the operation of the normally open solenoid valve, the coil is energized, especially with alternating current. The first iron core component 3 is affected by the electromagnetic force of alternating current fluctuations, resulting in high-frequency vibration and collision with the valve sleeve 400. Therefore, the energizing noise generated by the normally open solenoid valve is particularly loud at this time. The solution provided in this application solves the above problems well by setting a first buffer component. A first buffer component 5 is set in the first iron core component 3, and the outer diameter of the first buffer component 5 is larger than the outer diameter of the first iron core component 3. When the first iron core component 3 is affected by the electromagnetic force of alternating current fluctuations and generates high-frequency vibration, the first buffer element 510 of the first buffer component 5 contacts the valve sleeve 400 first, avoiding direct collision between the first iron core component 3 and the valve sleeve 400. The first buffer 510 is made of polymer material, and the valve sleeve 400 is made of stainless steel. The noise generated by the collision between metal and non-metal is almost negligible.

[0037] like Figure 3 , Figure 4a , Figure 4bAs shown, the inner wall of the first buffer member 510 includes a first mounting groove 5110, and the first support member 500 is at least partially located in the first mounting groove 5110. The outer wall of the first support member 500 abuts against the bottom wall of the first mounting groove 5110, while the inner wall of the first support member 500 does not contact the bottom wall of the first annular groove 320. It should be noted that during operation, the first iron core component 3 needs to slide within the valve sleeve 400, and the first buffer member 5 also has sliding space in the first annular groove 320. Since the first support member 500 is made of metal, and the first iron core component 3 is also made of metal, direct contact during sliding can easily generate friction, producing metal shavings or powder and other impurities, affecting the product's service life. Therefore, the inner wall of the first support member 500 does not contact the bottom wall of the first annular groove 320 to reduce friction between the metal parts and avoid the generation of impurities. The inner wall of the first buffer member 510 is provided with a first mounting groove 5110. On the one hand, this provides an elastic tension space from the inside to the outside for the first support member 500, ensuring that the outer wall of the first support member 500 abuts against the bottom wall of the first mounting groove 5110. On the other hand, it further restricts the relative displacement of the first support member 500 in the axial direction, preventing the first support member 500 from coming out of the first annular groove 320 during product use and improving stability. The shape of the bottom surface of the first mounting groove 5110 is adaptively set according to the shape of the first support member 500 and is not limited to a specific shape. For example, if the outer wall of the first support member 500 is an arc surface, then the bottom surface of the first mounting groove 5110 is also an arc surface; if the outer wall of the first support member 500 is a plane, then the bottom surface of the first mounting groove 5110 is also a plane.

[0038] like Figure 1 , Figure 5 As shown, the second core component 6 includes a first buffer component 5A. The outer wall of the second core component 6 includes a second annular groove 620, and a portion of the second buffer component 5A is located within the second annular groove 620. The second buffer component 5A is annular, and the diameter of its outer wall is larger than the diameter of the outer wall of the second core component 6. That is, the second buffer component 5A is fitted into the second annular groove 620, while a portion of the second buffer component 5A is exposed outside the second annular groove 620. With this configuration, the outer diameter of the second buffer component 5A is larger than the outer diameter of the second core component 6, making the outer wall of the second buffer component 5A closer to the inner wall of the valve sleeve 400. Alternatively, the outer wall of the second buffer component 5A could abut against the inner wall of the valve sleeve 400.

[0039] like Figure 5As shown, the second buffer component 5A includes a second support component 500A and a second buffer component 510A. Along the radial direction of the second core component 6, the second buffer component 510A is closer to the valve sleeve 400; that is, the second buffer component 510A is located between the second support component 500A and the sleeve 400. The diameter of the outer wall of the second buffer component 510A is larger than the diameter of the outer wall of the second core component 6. The outer wall of the second buffer component 510A slides against the inner wall of the valve sleeve 400. This arrangement brings the outer wall of the second buffer component 510A closer to the inner wall of the valve sleeve 400. Alternatively, the outer wall of the second buffer component 510A could slide against the inner wall of the valve sleeve 400 after contact.

[0040] like Figure 5 , Figure 6a , Figure 6b As shown, the second support member 500A includes a third notch 5001A, and the second buffer member 510A includes a fourth notch 5101A. The outer sidewall of the second support member 500A abuts against the inner sidewall of the second buffer member 510A. The third notch 5001A and the fourth notch 5101A are correspondingly provided. Here, "correspondingly provided" means that the third notch 5001A and the fourth notch 5101A are aligned accordingly, and the notch directions are consistent. The outer sidewall of the second support member 500A abuts against the inner sidewall of the second buffer member 510A. The material of the second support member 500A is metallic, and the material of the second buffer member 510A is non-metallic. Along the radial direction of the second iron core member 6, the second support member 500A applies an elastic force to the second buffer member 501A. The third notch 5001A ensures that the second support member 500A has an elastic force from the inner wall to the outer wall, guaranteeing that the outer wall of the second support member 500A abuts against the inner wall of the second buffer member 510A. The elastic force of the second support member 500A is then transferred to the second buffer member 510A, causing its outer wall to also have an elastic force from the inner side to the outer side, thus bringing it closer to, and even abutting against, the inner wall of the valve sleeve 400. The third notch 5001A and the fourth notch 5101A are correspondingly provided, ensuring sufficient contact between the second support member 500A and the second buffer member 510A, guaranteeing that the elastic force of the second support member 500A is fully effective and evenly transmitted to the second buffer member 510A.

[0041] Similarly, along the longitudinal direction of the normally open solenoid valve, the cross-section of the second support member 500A is circular, rectangular, or arc-shaped, and the cross-section of the second buffer member 510A is rectangular or arc-shaped. Specifically, if the cross-section of the second support member 500A is circular, it means that the second support member 500A is a C-shaped metal wire ring with a notch; if the cross-section of the second support member 500A is rectangular, it means that the second support member 500A is a C-shaped metal ring with a notch; if the cross-section of the second support member 500A is arc-shaped, it means that the second support member 500A is a C-shaped arc-shaped metal ring with a notch. In this embodiment, the second support member 500A is a C-shaped metal wire with a notch, and the material of the second support member 500A is an elastic metal material. The second buffer member 510A is a C-shaped rectangular ring with a notch, and the material of the second buffer member 510A is a rubber material or PTFE polymer material with wear-resistant properties. Elastic metal materials can ensure sufficient elastic force, while rubber or polymer materials with wear-resistant properties can play a role in wear resistance and vibration resistance, thereby improving the service life of the product.

[0042] like Figure 6a , 6b As shown, the inner wall of the second buffer member 510A includes a second mounting groove 5110A. The second support member 500A is at least partially located in the second mounting groove 5110A. The outer wall of the second support member 500A abuts against the bottom wall of the second mounting groove 5110A, while the inner wall of the second support member 500A does not contact the bottom wall of the second annular groove 620. The second mounting groove 5110A on the inner wall of the second buffer member 510A provides elastic tension space from the inside to the outside for the second support member 500A, ensuring that the outer wall of the second support member 500A abuts against the bottom wall of the second mounting groove 5110A. Furthermore, it further restricts the relative displacement of the second support member 500A in the axial direction, preventing the second support member 500A from dislodging from the second annular groove 620 during operation and improving stability. The shape of the bottom wall of the second mounting groove 5110A is adapted to the shape of the second support member 500A and is not limited to a specific shape. For example, if the outer wall of the second support member 500A is an arc surface, then the bottom surface of the second mounting groove 5110A is also an arc surface. If the outer wall of the second support member 500A is a plane, then the bottom surface of the second mounting groove 5110A is also a plane.

[0043] Preferably, along the longitudinal direction of the normally open solenoid valve, the first annular groove 320 is located on the outer wall of the upper half of the first iron core component 3, and the second annular groove 620 is located on the outer wall of the upper half of the second iron core component 6. This arrangement improves the stability of the first iron core component 3 and the second iron core component 6 within the valve sleeve 400. Figure 1As shown, under the action of electromagnetic force, the first iron core component 3 moves downward and attracts the second iron core component 6. At this time, the three components, the first iron core component 3, the second iron core component 6, and the piston component 2, are connected as one unit. At this time, the piston component 2 is restricted to radial displacement under the action of the valve seat 100 and to upward displacement under the action of the valve cover 110. Meanwhile, the first iron core component 3 and the second iron core component 6 are prevented from directly colliding with the valve sleeve 400 under the action of the first buffer component 5 and the second buffer component 5A, thus reducing noise.

[0044] Specifically, the valve body component 1 of this application includes a valve seat 100, a valve cover 110, and a nut sleeve 120. The nut sleeve 120 is threadedly engaged with the valve seat 100. The valve cover 110 is partially located between the valve seat 100 and the nut sleeve 120, and the nut sleeve 120 restricts the valve cover 110 from disengaging from the valve seat 100. The valve sleeve component 4 includes a valve sleeve cover 410. One end of the valve sleeve tube 400 is fixedly engaged with the valve sleeve cover 410, which means it is fixed by welding. The valve sleeve cover 410 restricts the first iron core component 3 from disengaging from the valve sleeve component 4. The other end of the valve sleeve tube 400 is fixedly engaged with the valve cover 110, which means it is fixed by welding. The piston component 2 includes a connecting section 200 and a guide section 210. The connecting section 200 is fixedly connected to the second iron core component 6. Specifically, the connecting section 200 has external threads, and the second iron core component 6 has internal threads. The connecting section 200 and the second iron core component 6 are engaged by threads. When the thread engagement depth reaches a set value, a portion of the threads is broken using specific tooling or equipment, further fixing the piston component 2 and the second iron core component 6 to each other. The guide section 210 is located within the cavity of the valve seat 100. The guide section 210 includes a piston ring component 2110, which is in sliding engagement with the inner wall of the cavity of the valve seat 100. It should be noted that the outer wall of the piston ring component 2110 is in contact with the inner wall of the cavity of the valve seat 100, serving both a sealing function and a guiding function. The upper end of the connecting section 200 includes a pilot valve port 2010, and the valve seat 100 includes a main valve port 1010. When the normally open solenoid valve is energized, the first iron core component 3 moves downward under the action of electromagnetic force and engages with the second iron core component 6 to close the pilot valve port 2010. The first iron core component 3 continues to push the piston component 2 downward to close the main valve port 1010. At this time, the first iron core component 3 and the second iron core component 6 vibrate at the amplitude frequency of the alternating current under the action of the electromagnetic force of the alternating current. The setting of the first buffer component 5 and the second buffer component 5A avoids the first iron core component 3 and the second iron core component 6 from directly hitting the inner wall of the valve sleeve 400 due to the vibration of the alternating electromagnetic force, thus reducing noise.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A normally open solenoid valve, characterized in that... The system includes a valve body component (1), a piston component (2), a first iron core component (3), a second iron core component (6), and a valve sleeve component (4). The valve body component (1) includes a valve cavity, and the piston component (2) is at least partially located in the valve cavity. The valve sleeve component (4) is fixedly connected to the valve body component (1) and includes a valve sleeve tube (400). The first iron core component (3) and the second iron core component (6) are located in the cavity of the valve sleeve tube (400), and the first iron core component (3) and the second iron core component (6) slide against the valve sleeve tube (400). In a dynamic fit, along the longitudinal direction of the normally open solenoid valve, the second iron core component (6) is closer to the piston component (2), the piston component (2) is fixedly connected to the second iron core component (6), the first iron core component (3) includes a first buffer component (5), the outer side wall of the first iron core component (3) includes a first annular groove (320), the first buffer component (5) is partially located in the first annular groove (320), the first buffer component (5) is annular, and the diameter of the outer side wall of the first buffer component (5) is larger than the diameter of the outer side wall of the first iron core component (3).

2. The normally open solenoid valve according to claim 1, characterized in that, The first buffer component (5) includes a first support (500) and a first buffer (510). Along the radial direction of the first iron core component (3), the first buffer (510) is closer to the valve sleeve (400). The first buffer (510) is located between the first support (500) and the valve sleeve (400). The diameter of the outer wall of the first buffer (510) is larger than the diameter of the outer wall of the first iron core component (3). The outer wall of the first buffer (510) slides in fit with the inner wall of the valve sleeve (400).

3. The normally open solenoid valve according to claim 2, characterized in that, The first support member (500) includes a first notch (5001), the first buffer member (510) includes a second notch (5101), the outer side wall of the first support member (500) abuts against the inner side wall of the first buffer member (510), the material of the first support member (500) is a metal material, the material of the first buffer member (510) is a non-metal material, the material of the valve sleeve (400) is stainless steel, and along the radial direction of the first iron core component (3), the first support member (500) applies an elastic force to the first buffer member (510).

4. The normally open solenoid valve according to claim 3, characterized in that, The inner wall of the first buffer member (510) includes a first mounting groove (5110), the first support member (500) is at least partially located in the first mounting groove (5110), the outer wall of the first support member (500) abuts against the bottom wall of the first mounting groove (5110), and the inner wall of the first support member (500) does not contact the bottom wall of the first annular groove (320).

5. The normally open solenoid valve according to claim 1, characterized in that, The second core component (6) includes a second buffer component (5A), the outer side wall of the second core component (6) includes a second annular groove (620), the second buffer component (5A) is partially located in the second annular groove (620), the second buffer component (5A) is annular, and the diameter of the outer side wall of the second buffer component (5A) is larger than the diameter of the outer side wall of the second core component (6).

6. The normally open solenoid valve according to claim 5, characterized in that, The second buffer component (5A) includes a second support (500A) and a second buffer (510A). Along the radial direction of the second core component (6), the second buffer (510A) is closer to the valve sleeve (400). The second buffer (510A) is located between the second support (500A) and the valve sleeve (400). The diameter of the outer wall of the second buffer (510A) is larger than the diameter of the outer wall of the second core component (6). The outer wall of the second buffer (510A) slides in fit with the inner wall of the valve sleeve (400).

7. The normally open solenoid valve according to claim 6, characterized in that, The second support member (500A) includes a third notch (5001A), and the second buffer member (510A) includes a fourth notch (5101A). The outer sidewall of the second support member (500A) abuts against the inner sidewall of the second buffer member (510A). The material of the second support member (500A) is a metallic material, and the material of the second buffer member (510A) is a non-metallic material. Along the radial direction of the second iron core component (6), the second support member (500A) applies an elastic force to the second buffer member (501A).

8. The normally open solenoid valve according to claim 7, characterized in that, The inner wall of the second buffer member (510A) includes a second mounting groove (5110A), the second support member (500A) is at least partially located in the second mounting groove (5110A), the outer wall of the second support member (500A) abuts against the bottom wall of the second mounting groove (5110A), and the inner wall of the second support member (500A) does not contact the bottom wall of the second annular groove (620).

9. The normally open solenoid valve according to claim 5, characterized in that, Along the longitudinal direction of the normally open solenoid valve, the first annular groove (320) is located on the outer side wall of the upper half of the first iron core component (3), and the second annular groove (620) is located on the outer side wall of the upper half of the second iron core component (6).

10. The normally open solenoid valve according to any one of claims 2-9, characterized in that, The valve body component (1) includes a valve seat (100), a valve cover (110), and a nut sleeve (120). The nut sleeve (120) is threadedly engaged with the valve seat (100) and restricts the valve cover (110) from disengaging from the valve seat (100). The valve sleeve component (4) includes a valve sleeve cover (410). One end of the valve sleeve tube (400) is fixedly engaged with the valve sleeve cover (410). The valve sleeve cover (410) restricts the first iron core component (3) from disengaging from the valve sleeve tube (400). The other end of the valve sleeve tube (400) is fixedly engaged with the valve cover (110). The piston component (2) includes a connecting section (200) and a guide section (210). The connecting section (200) is fixedly connected to the second iron core component (6). The guide section (210) is located in the cavity of the valve seat (100). The guide section (210) includes a piston ring component (2110). The piston ring component (2110) slides in cooperation with the inner wall of the cavity of the valve seat (100). The upper end of the connecting section (200) includes a pilot valve port (2010). The valve seat (100) includes a main valve port (1010). When the normally open solenoid valve is energized, the first iron core component (3) attracts the second iron core component (6) under the action of electromagnetic force and closes the pilot valve port (2010). The piston component (2) closes the main valve port (1010).

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