Solenoid valve

Abstract

The present invention provides a solenoid valve, comprising: a valve seat portion having a valve cavity and a flow hole, the valve cavity including a sealing cavity, a flow cavity and a valve orifice cavity that are sequentially communicated, and the flow hole is communicated with the flow cavity; a valve needle structure including a guiding portion, a rod body and a blocking portion, the two ends of the rod body are respectively connected to the guiding portion and the blocking portion, the guiding portion is movably arranged in the sealing cavity and is in sealing cooperation with the sealing cavity, and the blocking portion is used for blocking or opening the valve orifice cavity; a valve sleeve, one end of the valve sleeve is connected to the valve seat portion; a driving portion arranged in the cavity of the valve sleeve and in stop cooperation with the guiding portion, the communicating gap in the valve sleeve cavity is an armature cavity, and the sealing cavity is communicated with the armature cavity; the flow area of the cavity between the inner wall of the sealing cavity and the outer wall of the rod body is S1, the flow area of the cavity between the inner wall of the valve orifice cavity and the outer wall of the rod body is S2, and 0 ≤ S1 - S2 ≤ 0.3S2. Through the technical solution provided by the present invention, the problem of unbalanced pressures on both ends of the valve needle structure in the prior art can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and more particularly, to a solenoid valve. Background Art

[0002] For the solenoid valve in the prior art, fluid enters the flow cavity through the flow hole and moves towards the sealing cavity and the valve orifice cavity respectively. When the valve orifice cavity is closed, there is a large difference between the flow area of the cavity between the inner wall of the sealing cavity and the outer wall of the rod body and the flow area of the cavity between the inner wall of the valve orifice cavity and the outer wall of the rod body, resulting in unbalanced pressure on both ends of the valve needle structure and affecting the operating performance of the valve needle. Summary of the Invention

[0003] The present invention provides a solenoid valve to solve the problem of unbalanced pressure on both ends of the valve needle structure in the prior art.

[0004] To solve the above problems, the present invention provides a solenoid valve, including: a valve seat portion having a valve cavity and a flow hole, the valve cavity including a sealing cavity, a flow cavity, and a valve orifice cavity that are sequentially connected, and the flow hole is connected to the flow cavity; a valve needle structure movably disposed in the valve cavity, the valve needle structure including a guiding portion, a rod body, and a blocking portion, the two ends of the rod body are respectively connected to the guiding portion and the blocking portion, wherein the guiding portion is movably disposed in the sealing cavity, and the outer wall of the guiding portion is in sealing cooperation with the inner wall of the sealing cavity, and the blocking portion is used to block or open the valve orifice cavity; a valve sleeve, one end of the valve sleeve is connected to the valve seat portion; a driving portion disposed in the cavity of the valve sleeve, the driving portion is in stop cooperation with the guiding portion, and the communication gap in the valve sleeve cavity is an armature cavity, wherein the opening of the sealing cavity facing the driving portion is connected to the armature cavity; wherein, the flow area of the cavity between the inner wall of the sealing cavity and the outer wall of the rod body is S1, and the flow area of the cavity between the inner wall of the valve orifice cavity and the outer wall of the rod body is S2, and 0 ≤ S1 - S2 ≤ 0.3S2.

[0005] Further, the guiding portion includes a guiding head and a first sealing ring, the guiding head has a first sealing groove, the first sealing ring is disposed in the first sealing groove, and the outer wall of the first sealing ring is in sealing cooperation with the inner wall of the sealing cavity.

[0006] Further, the blocking portion includes a blocking head and a second sealing ring, the blocking head has a second sealing groove, the second sealing ring is disposed in the second sealing groove, and the second sealing ring is used for sealing cooperation with the inner wall of the valve orifice cavity.

[0007] Further, there is a limiting surface in the valve seat portion, and the solenoid valve further includes a first elastic member sleeved on the rod body, and the two ends of the first elastic member are respectively abutted against the guiding portion and the limiting surface; when the valve orifice cavity is open, the blocking portion is located outside the valve seat portion.

[0008] Further, the valve seat portion further includes a main structure and an inner limiting ring. The main structure has a valve cavity. The inner limiting ring is disposed on the inner wall of the flow cavity. The surface of the inner limiting ring facing the guiding portion forms a limiting surface. The valve cavity is located in the area on the side of the inner limiting ring facing the plugging portion to form a valve orifice cavity.

[0009] Further, the plugging portion includes a plugging head and a second sealing ring disposed on the plugging head. The inner diameter of the inner limiting ring is greater than the outer diameter of the plugging head. The inner diameter of the valve orifice cavity is greater than the inner diameter of the inner limiting ring. The outer diameter of the second sealing ring is greater than the inner diameter of the valve orifice cavity.

[0010] Further, the rod body, the sealing cavity, and the valve orifice cavity are all cylindrical structures. The inner diameter of the sealing cavity is D1, the inner diameter of the valve orifice cavity is D2, and D1 / D2 = S1 / S2.

[0011] Further, the valve seat portion includes a main structure and a third sealing ring. The main structure has a valve cavity. There is a third sealing groove on the outer side wall of the main structure. The third sealing ring is disposed in the third sealing groove, and the third sealing ring is located between the valve orifice cavity and the flow hole.

[0012] Further, the driving portion includes a moving iron core, an attractor, and a second elastic member. The moving iron core is movably disposed in the cavity of the valve sleeve. The attractor is disposed on the side of the moving iron core away from the valve seat portion. The two ends of the second elastic member respectively abut against the moving iron core and the attractor.

[0013] Further, a positioning groove is provided at one end of the moving iron core facing the valve orifice cavity. One end of the guiding portion is in a stop fit with the bottom wall of the positioning groove.

[0014] Applying the technical solution of the present invention, a solenoid valve is provided, including: a valve seat portion having a valve cavity and a flow hole, the valve cavity including a sealing cavity, a flow cavity, and a valve orifice cavity that are sequentially communicated, and the flow hole is communicated with the flow cavity; a valve needle structure movably disposed in the valve cavity, the valve needle structure including a guiding portion, a rod body, and a blocking portion, the two ends of the rod body being respectively connected to the guiding portion and the blocking portion, wherein the guiding portion is movably disposed in the sealing cavity, the outer wall of the guiding portion being in sealing fit with the inner wall of the sealing cavity, and the blocking portion being used to block or open the valve orifice cavity; a valve sleeve, one end of the valve sleeve being connected to the valve seat portion; a driving portion disposed in the cavity of the valve sleeve, the driving portion being in abutting fit with the guiding portion, the communication gap in the cavity of the valve sleeve being an armature cavity, wherein the opening of the sealing cavity facing the driving portion is communicated with the armature cavity; wherein, the flow area of the cavity between the inner wall of the sealing cavity and the outer wall of the rod body is S1, the flow area of the cavity between the inner wall of the valve orifice cavity and the outer wall of the rod body is S2, and 0≤S1 - S2≤0.3S2. With this solution, the fluid entering the valve cavity through the flow hole generates the same pressure at the two flow areas S1 and S2, and the area between S1 and S2 is controlled within the above range, making the areas of S1 and S2 close. In this way, after closing the valve orifice cavity, the pressure received by the guiding portion and the pressure received by the blocking portion are similar, so that the valve needle structure only needs to overcome the friction force when opening the valve, thereby enabling the valve needle structure not to affect the operating performance of the valve needle structure when bearing a higher pressure impact, and improving the reliability of the solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0016] Figure 1 shows a schematic structural diagram of the solenoid valve provided by an embodiment of the present invention;

[0017] Figure 2 shows Figure 1 a schematic structural diagram of the valve needle structure in the solenoid valve of

[0018] Figure 3 shows Figure 1 a schematic structural diagram of the valve seat portion in the solenoid valve of

[0019] Figure 4 shows Figure 1 a schematic structural diagram of the solenoid valve in the closed valve state of

[0020] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0021] 10. Valve seat part; 11. Valve cavity; 111. Sealing cavity; 112. Flow-through cavity; 113. Valve orifice cavity; 12. Flow-through hole; 13. Limiting surface; 14. Main body structure; 15. Inner limiting ring; 16. Third sealing ring; 17. Third sealing groove; 20. Valve sleeve; 30. Valve needle structure; 31. Guiding part; 32. Rod body; 33. Blocking part; 34. Guiding head; 35. First sealing ring; 36. First sealing groove; 37. Blocking head; 38. Second sealing ring; 39. Second sealing groove; 40. Driving part; 41. Moving iron core; 42. Attractor; 43. Second elastic part; 44. Positioning groove; 50. Iron core cavity; 61. First elastic part. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation on the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] As Figures 1 to 4 shown, an embodiment of the present invention provides a solenoid valve, including: a valve seat part 10, the valve seat part 10 has a valve cavity 11 and a flow-through hole 12, the valve cavity 11 includes a sealing cavity 111, a flow-through cavity 112 and a valve orifice cavity 113 that are sequentially communicated, and the flow-through hole 12 is communicated with the flow-through cavity 112; a valve needle structure 30, movably arranged in the valve cavity 11, the valve needle structure 30 includes a guiding part 31, a rod body 32 and a blocking part 33, both ends of the rod body 32 are respectively connected to the guiding part 31 and the blocking part 33, wherein, the guiding part 31 is movably arranged in the sealing cavity 111, and the outer wall of the guiding part 31 is in sealing cooperation with the inner wall of the sealing cavity 111, and the blocking part 33 is used to block or open the valve orifice cavity 113; a valve sleeve 20, one end of the valve sleeve 20 is connected to the valve seat part 10; a driving part 40, arranged in the cavity of the valve sleeve 20, the driving part 40 is in stop cooperation with the guiding part 31, and the communicating gap in the cavity of the valve sleeve 20 is an iron core cavity 50, wherein, the opening of the sealing cavity 111 facing the driving part 40 is communicated with the iron core cavity 50; wherein, the flow area of the cavity between the inner wall of the sealing cavity 111 and the outer wall of the rod body 32 is S1, and the flow area of the cavity between the inner wall of the valve orifice cavity 113 and the outer wall of the rod body 32 is S2, 0 ≤ S1 - S2 ≤ 0.3S2.

[0024] In this embodiment, the fluid entering the valve cavity 11 through the flow holes 12 generates the same pressure at the two flow areas S1 and S2. Controlling the area between S1 and S2 within the above range makes the areas of S1 and S2 close to each other. In this way, after closing the valve cavity 113, the pressure received by the guiding part 31 is similar to the pressure received by the blocking part 33. When opening the valve, the valve needle structure 30 only needs to overcome the friction force, so that the valve needle structure 30 is not affected in its operating performance when bearing a higher pressure impact, improving the reliability of the solenoid valve.

[0025] Specifically, the communication gap can also be understood as: the space in the cavity of the valve sleeve 20 after removing the solid structures, and it is a space where different regions are connected as a whole. The solid structures include the valve seat part 10, the valve needle structure 30, the driving part 40, etc.

[0026] During use, the pressure in the armature cavity 50 is close to the pressure outside the solenoid valve needle to better ensure the balance of the pressures at both ends of the valve needle structure 30. For example, when used in an atmospheric environment, the outlet of the valve cavity 113 is the atmospheric environment. During the installation and sealing of the solenoid valve, the fluid sealed in the armature cavity 50 is the atmosphere. With this setting, the pressures received at both ends of the valve needle structure 30 are both atmospheric pressures, and during the use of the valve needle structure 30, the balance of the pressures at both ends of the valve needle structure 30 can be better ensured.

[0027] Optionally, the valve seat part 10 includes a valve cover and a valve core. The valve cover is connected to the valve sleeve 20. The valve core has a valve cavity 11 and flow holes 12. The valve cover and the valve core can be integrally formed by machining, or the valve cover and the valve core can be separately formed by machining and then fixedly connected.

[0028] As Figure 1 and Figure 2 shown, the guiding part 31 includes a guiding head 34 and a first sealing ring 35. The guiding head 34 has a first sealing groove 36. The first sealing ring 35 is arranged in the first sealing groove 36, and the outer wall of the first sealing ring 35 is in sealing cooperation with the inner wall of the sealing cavity 111.

[0029] In this embodiment, the fluid enters the flow cavity 112 through the flow holes 12 and flows respectively towards the sealing cavity 111 and the valve cavity 113. The first sealing ring 35 is sleeved on the guiding head 34 and is in sealing cooperation with the inner wall of the sealing cavity 111 to block the sealing cavity 111, prevent the fluid from entering the armature cavity 50 and contacting the driving part 40 resulting in rusting of the driving part 40, and at the same time ensure the pressure stability in the armature cavity 50. Moreover, with this setting, the valve needle structure 30 can move smoothly, is not prone to shaking, and improves the use performance of the solenoid valve.

[0030] Specifically, the first sealing ring 35 within the guiding portion 31 seals the sealing cavity 111 in a dynamic sealing manner, and the first sealing ring 35 will move along with the movement of the guiding head 34 within the sealing cavity 111. The pressure of the fluid on the flow-through area S1 is the pressure of the fluid on the guiding portion 31.

[0031] Further, the plugging portion 33 includes a plugging head 37 and a second sealing ring 38. The plugging head 37 has a second sealing groove 39, and the second sealing ring 38 is disposed within the second sealing groove 39. The second sealing ring 38 is used for sealingly cooperating with the inner wall of the valve cavity 113.

[0032] In this embodiment, the fluid enters the flow-through cavity 112 through the flow-through hole 12 and flows respectively towards the sealing cavity 111 and the valve cavity 113. The second sealing ring 38 is sleeved on the plugging head 37, and the plugging of the valve cavity 113 is achieved through the second sealing ring 38, ensuring the reliability of the plugging.

[0033] Specifically, the plugging portion 33 moves along with the movement of the guiding portion 31. When the plugging head 37 moves outside the valve cavity 113, the second sealing ring 38 within the plugging portion 33 is also located outside the valve cavity 113, and the valve cavity 113 is in an open state; when at least a part of the plugging head 37 moves inside the valve cavity 113, at least a part of the second sealing ring 38 within the plugging portion 33 is also located inside the valve cavity 113, and the outer sidewall of the second sealing ring 38 sealingly cooperates with the inner sidewall of the valve cavity 113, and the valve cavity 113 is in a plugged state. This setting ensures that the valve needle structure 30 can move smoothly, improves the reliability of sealing the valve cavity 113, and enhances the service performance of the solenoid valve.

[0034] Specifically, the pressure of the fluid on the flow-through area S2 is the pressure of the fluid on the plugging portion 33.

[0035] As Figure 1 and Figure 3 shown, the valve seat portion 10 has a limiting surface 13. The solenoid valve further includes a first elastic member 61. The first elastic member 61 is sleeved on the rod body 32, and the two ends of the first elastic member 61 respectively abut against the guiding portion 31 and the limiting surface 13; when the valve cavity 113 is open, the plugging portion 33 is located outside the valve seat portion 10.

[0036] In this embodiment, the two ends of the first elastic member 61 respectively abut against the guiding head 34 and the limiting surface 13. By the elongation of the first elastic member 61, the valve needle structure 30 is pushed towards the driving portion 40, and further the plugging portion 33 enters the valve cavity 113 to achieve the purpose of plugging the valve cavity 113. With this setting, the outer sidewall of the first elastic member 61 is in limiting cooperation with the inner sidewall of the valve cavity 11, and the inner sidewall of the valve cavity 11 plays a certain guiding role for the first elastic member 61, with good guiding effect and no risk of shaking, making the movement of the valve needle structure 30 more reliable.

[0037] As Figure 3 shown, the valve seat portion 10 further includes a main body structure 14 and an inner limiting ring 15. The main body structure 14 has a valve cavity 11. The inner limiting ring 15 is arranged on the inner wall of the flow cavity 112. The surface of the inner limiting ring 15 facing the guiding portion 31 forms a limiting surface 13. The valve cavity 11 is located in the area on the side of the inner limiting ring 15 facing the blocking portion 33 to form a valve orifice cavity 113.

[0038] In this embodiment, by providing the inner limiting ring 15 to limit the first elastic member 61, the first elastic member 61 is in a compressed state when the valve is opened, so as to apply an elastic force to the valve needle structure 30 when the valve is closed.

[0039] Furthermore, the blocking portion 33 includes a blocking head 37 and a second sealing ring 38 provided on the blocking head 37. The inner diameter of the inner limiting ring 15 is larger than the outer diameter of the blocking head 37. The inner diameter of the valve orifice cavity 113 is larger than the inner diameter of the inner limiting ring 15. The outer diameter of the second sealing ring 38 is larger than the inner diameter of the valve orifice cavity 113.

[0040] In this embodiment, the first elastic member 61 first penetrates from the end where the blocking head 37 of the valve needle structure 30 is located and abuts against the end face of the guiding portion 31. Then, the valve needle structure 30 with the first elastic member 61 is penetrated from one end of the sealing cavity 111 in the valve seat portion 10. The blocking portion 33 in the valve needle structure 30 is arranged through the valve cavity 11. The first elastic member 61 sleeved on the valve needle structure 30 abuts against the inner limiting ring 15. The guiding portion 31 is movably arranged in the sealing cavity 111 and is in limit cooperation with the inner wall of the sealing cavity 111 to complete the installation of the valve needle structure 30. The inner diameter of the inner limiting ring 15 is larger than the outer diameter of the blocking head 37 to ensure that the blocking head 37 can pass through the inner limiting ring 15 and enter the side of the valve orifice cavity 113; the inner diameter of the valve orifice cavity 113 is larger than the inner diameter of the inner limiting ring 15 to ensure that the second sealing ring 38 on the blocking head 37 can enter the valve orifice cavity 113 to block the valve orifice cavity 113; the outer diameter of the second sealing ring 38 is larger than the inner diameter of the valve orifice cavity 113 to ensure the reliability of blocking the valve orifice cavity 113.

[0041] Optionally, the inner diameter of the first elastic member 61 is larger than the outer diameter of the blocking head 37 in the blocking portion 33, which is convenient for the assembly of the first elastic member 61.

[0042] Furthermore, the rod body 32, the sealing cavity 111 and the valve orifice cavity 113 are all cylindrical structures. The inner diameter of the sealing cavity 111 is D1, the inner diameter of the valve orifice cavity 113 is D2, and D1 / D2 = S1 / S2.

[0043] In this embodiment, S1 is the area of the circular ring formed between the sealing cavity 111 and the rod body 32, and S2 is the area of the circular ring formed between the valve cavity 113 and the rod body 32. The flow area S1 is the cross-sectional area of the sealing cavity 111 minus the cross-sectional area of the rod body 32, and the flow area S2 is the cross-sectional area of the valve cavity 113 minus the cross-sectional area of the rod body 32. Since the cross-sectional area of the rod body 32 remains unchanged, D1 / D2 = S1 / S2. This setting facilitates the calculation of the flow areas S1 and S2, and the error between the two flow areas can be easily calculated through D1 and D2, making the design convenient.

[0044] As Figure 3 and Figure 4 shown, the valve seat portion 10 includes a main structure 14 and a third sealing ring 16. The main structure 14 has a valve cavity 11. A third sealing groove 17 is provided on the outer side wall of the main structure 14. The third sealing ring 16 is arranged in the third sealing groove 17, and the third sealing ring 16 is located between the valve cavity 113 and the flow hole 12. By providing the third sealing ring 16, the sealing performance of the solenoid valve can be ensured.

[0045] Specifically, the solenoid valve is assembled on the connecting seat. The connecting seat has an inlet cavity and an outlet cavity. The inlet cavity is communicated with the flow hole 12 of the solenoid valve, and the outlet cavity is communicated with the valve cavity 113 of the solenoid valve. The third sealing ring 16 is arranged in the third sealing groove 17 to isolate the inlet cavity and the outlet cavity, improving the sealing performance of the solenoid valve.

[0046] As Figure 4 shown, the driving portion 40 includes a moving iron core 41, an attractor 42, and a second elastic member 43. The moving iron core 41 is movably arranged in the cavity of the valve sleeve 20. The attractor 42 is arranged on the side of the moving iron core 41 away from the valve seat portion 10. The two ends of the second elastic member 43 are respectively abutted against the moving iron core 41 and the attractor 42.

[0047] In this embodiment, when the solenoid valve is powered on, the moving iron core 41 moves closer to the attractor 42 and engages with the attractor 42, compressing the second elastic member 43, creating a gap between the moving iron core 41 and the valve needle structure 30. At this time, the first elastic member 61 in contact with the inner limiting ring 15 in the valve seat portion 10 elongates, pushing the guiding head 34 of the valve needle structure 30 in contact with its other end towards the moving iron core 41, causing the entire valve needle structure 30 to move towards the moving iron core 41. As a result, the blocking portion 33 within the valve needle structure 30 enters the valve cavity 113 to block the valve cavity 113. When the solenoid valve is powered off, the attractor 42 no longer attracts the moving iron core 41, and the compressed second elastic member 43 elongates, pushing the moving iron core 41 in a direction away from the attractor 42. During the pushing process, one end of the moving iron core 41 abuts against one end of the guiding portion 31 of the valve needle structure 30, and the moving iron core 41 pushes the valve needle structure 30 to move, compressing the first elastic member 61 sleeved on the valve needle structure 30 until one end of the moving iron core 41 abuts against one end of the valve core in the valve seat portion 10. At this point, the second elastic member 43 stops elongating, the moving iron core 41 and the valve needle structure 30 stop moving, and the first elastic member 61 stops being compressed. At this time, the blocking portion 33 of the valve needle structure 30 moves outside the valve cavity 113, and the valve cavity 113 opens.

[0048] Specifically, the iron core cavity 50 includes an upper cavity and a lower cavity that communicate with each other. The upper cavity is formed by the space between the moving iron core 41 and the attractor 42, and the lower cavity is formed by the space between the valve seat portion 10, the valve sleeve 20, and the moving iron core 41.

[0049] Among them, the elastic force of the second elastic member 43 should be greater than that of the first elastic member 61 to ensure that the valve cavity 113 can be opened.

[0050] Furthermore, a positioning groove 44 is provided at one end of the moving iron core 41 facing the valve cavity 113, and one end of the guiding portion 31 is in a stop fit with the bottom wall of the positioning groove 44.

[0051] In this embodiment, the bottom wall of the positioning groove 44 pushes one end of the guiding portion 31 towards the valve cavity 113 to open the valve. By providing the positioning groove 44, the movement of the moving iron core 41 is restricted to ensure the performance of the solenoid valve.

[0052] Specifically, the positioning groove 44 also functions as a guide. One end of the valve core in the valve seat portion 10 is in a limiting fit with the positioning groove 44 to guide and limit the movement of the moving iron core 41, preventing the moving iron core 41 from shifting during movement and affecting the use of the solenoid valve.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A solenoid valve, characterized in that, it comprises: a valve seat part (10), the valve seat part (10) includes a valve cover and a valve core, the valve cover and the valve core are integrally processed, or the valve cover and the valve core are separately processed and then fixedly connected; the valve core has a valve cavity (11) and a flow hole (12), the valve cavity (11) includes a sealing cavity (111), a flow cavity (112) and a valve orifice cavity (113) that are connected in sequence, and the flow hole (12) communicates with the flow cavity (112); a valve needle structure (30), movably arranged in the valve cavity (11), the valve needle structure (30) includes a guiding part (31), a rod body (32) and a blocking part (33), both ends of the rod body (32) are respectively connected to the guiding part (31) and the blocking part (33), wherein, the guiding part (31) is movably arranged in the sealing cavity (111), and the outer wall of the guiding part (31) is in sealing cooperation with the inner wall of the sealing cavity (111), and the blocking part (33) is used to block or open the valve orifice cavity (113); a valve sleeve (20), one end of the valve sleeve (20) is connected to the valve seat part (10); a driving part (40), arranged in the cavity of the valve sleeve (20), the driving part (40) is in stop cooperation with the guiding part (31), and the communicating gap in the cavity of the valve sleeve (20) is an armature cavity (50), wherein, the opening of the sealing cavity (111) facing the driving part (40) communicates with the armature cavity (50); wherein, the flow area of the cavity between the inner wall of the sealing cavity (111) and the outer wall of the rod body (32) is S1, and the flow area of the cavity between the inner wall of the valve orifice cavity (113) and the outer wall of the rod body (32) is S2, and 0 ≤ S1 - S2 ≤ 0.3S2.

2. The solenoid valve according to claim 1, characterized in that, the guiding part (31) includes a guiding head (34) and a first sealing ring (35), the guiding head (34) has a first sealing groove (36), the first sealing ring (35) is arranged in the first sealing groove (36), and the outer wall of the first sealing ring (35) is in sealing cooperation with the inner wall of the sealing cavity (111).

3. The solenoid valve according to claim 1, characterized in that, the blocking part (33) includes a blocking head (37) and a second sealing ring (38), the blocking head (37) has a second sealing groove (39), the second sealing ring (38) is arranged in the second sealing groove (39), and the second sealing ring (38) is used to be in sealing cooperation with the inner wall of the valve orifice cavity (113).

4. The solenoid valve according to claim 1, characterized in that, The valve seat portion (10) has a limiting surface (13) therein. The solenoid valve further includes a first elastic member (61) sleeved on the rod body (32), and two ends of the first elastic member (61) are respectively in contact with the guiding portion (31) and the limiting surface (13); when the valve cavity (113) is open, the blocking portion (33) is located outside the valve seat portion (10).

5. The solenoid valve according to claim 4, wherein, the valve seat portion (10) further includes a main body structure (14) and an inner limiting ring (15). The main body structure (14) has the valve cavity (11), the inner limiting ring (15) is arranged on the inner wall of the flow cavity (112), a surface of the inner limiting ring (15) facing the guiding portion (31) forms the limiting surface (13), and a region of the valve cavity (11) located on a side of the inner limiting ring (15) facing the blocking portion (33) forms the valve orifice cavity (113).

6. The solenoid valve according to claim 5, wherein, the blocking portion (33) includes a blocking head (37) and a second sealing ring (38) arranged on the blocking head (37). The inner diameter of the inner limiting ring (15) is larger than the outer diameter of the blocking head (37), the inner diameter of the valve orifice cavity (113) is larger than the inner diameter of the inner limiting ring (15), and the outer diameter of the second sealing ring (38) is larger than the inner diameter of the valve orifice cavity (113).

7. The solenoid valve according to claim 1, wherein, the rod body (32), the sealing cavity (111) and the valve orifice cavity (113) are all cylindrical structures. The inner diameter of the sealing cavity (111) is D1, the inner diameter of the valve orifice cavity (113) is D2, and D1 / D2 = S1 / S2.

8. The solenoid valve according to claim 1, wherein, the valve seat portion (10) includes a main body structure (14) and a third sealing ring (16). The main body structure (14) has the valve cavity (11), a third sealing groove (17) is formed on an outer side wall of the main body structure (14), the third sealing ring (16) is arranged in the third sealing groove (17), and the third sealing ring (16) is located between the valve orifice cavity (113) and the flow hole (12).

9. The solenoid valve according to claim 1, wherein, the driving portion (40) includes a moving iron core (41), an attractor (42) and a second elastic member (43). The moving iron core (41) is movably arranged in a cavity of the valve sleeve (20), the attractor (42) is arranged on a side of the moving iron core (41) away from the valve seat portion (10), and two ends of the second elastic member (43) are respectively in contact with the moving iron core (41) and the attractor (42).

10. The solenoid valve according to claim 9, wherein, a positioning groove (44) is formed at one end of the moving iron core (41) facing the valve orifice cavity (113), and one end of the guiding portion (31) is in a stop fit with a bottom wall of the positioning groove (44).

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