Valve module and solenoid valve

Abstract

The invention provides a valve module and an electromagnetic valve, and the valve module comprises a valve assembly which is provided with a first accommodating cavity, a piston cavity and a pilot valve port; the movable iron core is movably arranged in the first containing cavity, and the movable iron core is provided with a valve needle main cavity; the piston assembly is used for opening and closing the pilot valve port; one end of the piston channel is a pressure relief opening, and the other end of the piston channel is communicated with the pilot valve opening; the return spring is arranged in the first accommodating cavity and applies elastic force to the moving iron core; the small valve needle is arranged in the valve needle main cavity; and in the state that the pilot valve port is closed, the moving iron core can abut against the piston assembly, and the small valve needle closes the pressure relief port. The elastic force of the return spring can act on the piston assembly through the moving iron core, so that the electromagnetic valve is reliably opened and closed. The elastic force of the return spring is prevented from directly generating large impact on the pressure relief opening, and sealing of the pressure relief opening after long-term use is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a valve module and a solenoid valve. Background Art

[0002] At present, with respect to the sealing of the valve port of the existing solenoid valve, generally speaking, the larger the size of the valve port, the greater the sealing force required. Therefore, in order to ensure the sealing force, the traditional solenoid valve adopts a spring with relatively large elastic force to provide elastic force; the traditional solenoid valve applies elastic force to the iron core by setting a spring, and the iron core transmits the elastic force to the valve needle, and then the valve needle transmits the elastic force to the pressure relief port of the piston assembly, thereby controlling the piston assembly to close the pilot valve port. However, due to the different inner diameters of the pressure relief port and the pilot valve port, the force (i.e., elastic force) they bear is the same. Therefore, during the closing process of the solenoid valve, the elastic force has a greater impact on the pressure relief port through the valve, which will affect the sealing at the pressure relief port under long-term use, and further affect the flow accuracy and service life of the solenoid valve. Summary of the invention

[0003] The present invention provides a solenoid valve to solve the problem in the prior art that during the closing process of the solenoid valve, the elastic force exerts a large impact on the pressure relief port through the valve, which may affect the sealing at the pressure relief port under long-term use, thereby affecting the flow accuracy and service life of the solenoid valve.

[0004] In order to solve the above-mentioned problem, according to one aspect of the present invention, a valve module is provided, comprising: a valve assembly, the valve assembly having a first accommodating chamber, a piston chamber and a pilot valve port which are arranged in sequence; a moving iron core, movably arranged in the first accommodating chamber, the moving iron core having a valve needle total chamber; a piston assembly, movably arranged in the piston chamber, the piston assembly being used to open and close the pilot valve port; the piston assembly having a through piston passage, one end of the piston passage being a pressure relief port, and the other end being connected to the pilot valve port; a return spring, arranged in the first accommodating chamber, the return spring applying an elastic force toward the piston assembly to the moving iron core; a small valve needle, arranged in the valve needle total chamber, the small valve needle being used to open and close the pressure relief port; wherein, when the pilot valve port is closed, the moving iron core can abut against the piston assembly, and the small valve needle closes the pressure relief port.

[0005] Furthermore, the small valve needle is movably arranged in the valve needle main cavity; the valve module also includes a valve needle spring, which is arranged in the valve needle main cavity, and the valve needle spring applies an elastic force to the small valve needle toward the pressure relief port.

[0006] Furthermore, the elastic force provided by the return spring to the moving iron core is greater than the elastic force provided by the valve needle spring to the small valve needle.

[0007] Further, when the moving iron core and the small valve needle move synchronously toward the piston assembly until the small valve needle contacts the piston assembly, the elastic force of the return spring is F1, the elastic force of the valve needle spring is f1, and F1>5f1.

[0008] Further, when the moving iron core moves toward the piston assembly until the moving iron core contacts the piston assembly, the elastic force of the return spring is F2, the elastic force of the valve needle spring is f2, and F2>3.5f2.

[0009] Furthermore, when the moving iron core, the small valve needle and the piston assembly synchronously move toward the pilot valve port until the piston assembly contacts the pilot valve port, the elastic force of the return spring is F3, the elastic force of the valve needle spring is f3, and F3>2f3.

[0010] Furthermore, the maximum deformation amount of the valve needle spring in the axial direction is not less than the maximum length of the portion of the small valve needle extending out of the valve needle total cavity in the axial direction.

[0011] Furthermore, one end of the moving iron core close to the piston assembly has a protrusion, the protrusion is used to abut against the piston assembly, and at least a part of the valve needle main cavity is located in the protrusion.

[0012] Furthermore, an area formed by the abutment between the protrusion and the piston assembly is not smaller than an area formed by the abutment between the pilot valve port and the piston assembly.

[0013] Furthermore, the valve module also includes a retaining spring, which is arranged in the piston cavity. The piston assembly is located between the pilot valve port and the retaining spring, and the retaining spring is used to axially limit the piston assembly.

[0014] Furthermore, the valve needle total cavity includes a first spring cavity, a fluid channel and a valve needle cavity which are connected in sequence; there is also a balancing channel inside the moving iron core, one end of the balancing channel is connected to the first accommodating cavity, and the other end of the balancing channel is connected to any one of the first spring cavity, the fluid channel and the valve needle cavity.

[0015] Furthermore, the valve module also includes a first gasket, which is fixed on the moving iron core and cooperates with the small valve needle to limit the displacement of the small valve needle toward the piston assembly.

[0016] Furthermore, the piston assembly includes a piston body and a sealing block, the piston body has a limiting cavity inside, and the sealing block is fixed in the limiting cavity; the piston channel is arranged in the sealing block; the sealing block is used to abut and cooperate with the pilot valve port to close the pilot valve port.

[0017] According to another aspect of the present invention, a solenoid valve is provided, comprising the above-mentioned valve module, and the solenoid valve also includes: a valve body, which has a first installation cavity, a first pressure channel connected to the first installation cavity, a second pressure channel connected to the first installation cavity, a first flow port that can be connected to the first installation cavity, and a second flow port connected to the first installation cavity; an on-off component, which is movably arranged in the first installation cavity, and is used to control the connection or disconnection between the first flow port and the second flow port; the valve module is arranged on the valve body, and the connection or disconnection between the first flow port and the second flow port is controlled by controlling the on-off component; the first pressure channel is connected to the piston cavity; wherein the first installation cavity is divided into a left cavity and a right cavity by the on-off component, and the on-off component is driven to reciprocate by the pressure difference change in the left cavity and the right cavity; the first pressure channel is connected to the right cavity; the second pressure channel is used to connect the left cavity and the right cavity; the first flow port is connected to the pilot valve port; the second flow port is connected to the left cavity; the first flow port is a fluid outlet, and the second flow port is a fluid inlet.

[0018] Applying the technical solution of the present invention, the present invention provides a valve module, including: a valve assembly, the valve assembly has a first accommodating chamber, a piston chamber and a pilot valve port arranged in sequence; a moving iron core, movably arranged in the first accommodating chamber, the moving iron core has a valve needle total chamber; a piston assembly, movably arranged in the piston chamber, the piston assembly is used to open and close the pilot valve port; the piston assembly has a through piston channel, one end of the piston channel is a pressure relief port, and the other end is connected to the pilot valve port; a return spring, arranged in the first accommodating chamber, the return spring applies an elastic force toward the piston assembly to the moving iron core; a small valve needle, arranged in the valve needle total chamber, the small valve needle is used to open and close the pressure relief port; wherein, when the pilot valve port is closed, the moving iron core can abut against the piston assembly, and the small valve needle closes the pressure relief port. The present invention ensures that the elastic force of the return spring can act on the piston assembly through the moving iron core by arranging the moving iron core to abut against the piston assembly directly, thereby making the switch of the solenoid valve reliable. The present invention avoids the elastic force of the return spring from directly exerting a large impact on the pressure relief port during the closing process of the solenoid valve, thereby ensuring the sealing of the pressure relief port during long-term use, thereby ensuring the flow accuracy of the solenoid valve and increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the internal structure of a solenoid valve provided by an embodiment of the present invention is shown;

[0021] Figure 2 A schematic diagram showing the internal structure of a valve module provided by an embodiment of the present invention is shown;

[0022] Figure 3 A schematic diagram showing the internal structure of the valve module provided by an embodiment of the present invention during the first process of closing the pilot valve port;

[0023] Figure 4 A schematic diagram showing the internal structure of the valve module provided by an embodiment of the present invention during the second process of closing the pilot valve port;

[0024] Figure 5 A schematic diagram showing the internal structure of the valve module provided by an embodiment of the present invention during the third process of closing the pilot valve port;

[0025] Figure 6 A schematic diagram showing the internal structure of the valve module provided by an embodiment of the present invention during the first process of opening the pilot valve port;

[0026] Figure 7 A schematic diagram showing the internal structure of the valve module provided by an embodiment of the present invention during the second process of opening the pilot valve port;

[0027] Figure 8 A schematic diagram of the internal structure of the valve module provided by an embodiment of the present invention during the third process of opening the pilot valve port is shown;

[0028] Fig. 9 A schematic diagram showing the cooperation between the moving iron core and the small valve needle provided by an embodiment of the present invention is shown;

[0029] Fig.10 A schematic diagram of the internal structure of a piston assembly provided by an embodiment of the present invention is shown.

[0030] The above drawings include the following reference numerals:

[0031] 10. Valve assembly; 11. First accommodating chamber; 12. Piston chamber; 13. Pilot valve port; 14. Valve seat; 15. Sleeve;

[0032] 20, moving iron core; 21, valve needle total cavity; 211, first spring cavity; 212, fluid channel; 213, valve needle cavity; 22, balance channel; 23, protrusion;

[0033] 30. Piston assembly; 31. Piston channel; 311. Pressure relief port; 32. Piston body; 33. Sealing block;

[0034] 40. Return spring;

[0035] 50. Small valve needle;

[0036] 60. Valve needle spring;

[0037] 70. Electromagnetic component; 71. Attractor;

[0038] 80. First gasket;

[0039] 90, valve body; 91, first installation cavity; 92, first pressure channel; 93, second pressure channel; 94, first flow port; 95, second flow port;

[0040] 100. Switching components;

[0041] 110. One-way valve;

[0042] 120. Circlip. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below 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 of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] like Figures 1 to 10 As shown, an embodiment of the present invention provides a valve module, comprising:

[0045] The valve assembly 10 comprises a first accommodating chamber 11, a piston chamber 12 and a pilot valve port 13 which are arranged in sequence;

[0046] The moving iron core 20 is movably disposed in the first accommodating chamber 11, and the moving iron core 20 has a valve needle main chamber 21;

[0047] The piston assembly 30 is movably disposed in the piston chamber 12, and is used to open and close the pilot valve port 13; the piston assembly 30 has a through piston passage 31, one end of the piston passage 31 is a pressure relief port 311, and the other end is connected to the pilot valve port 13;

[0048] A return spring 40 is disposed in the first accommodating chamber 11, and the return spring 40 applies an elastic force to the moving iron core 20 toward the piston assembly 30;

[0049] A small valve needle 50, disposed in the valve needle main cavity 21, and used for opening and closing the pressure relief port 311;

[0050] When the pilot valve port 13 is closed, the moving iron core 20 can abut against the piston assembly 30 , and the small valve needle 50 closes the pressure relief port 311 .

[0051] The present invention ensures that the elastic force of the return spring 40 can act on the piston assembly 30 through the moving iron core 20, thereby making the switch of the solenoid valve reliable. In the process of closing the solenoid valve, the elastic force of the return spring 40 is prevented from directly impacting the pressure relief port 311, thereby ensuring the sealing of the pressure relief port 311 under long-term use, thereby ensuring the flow accuracy of the solenoid valve and increasing its service life.

[0052] like Figure 1 and Figure 2 As shown, the small valve needle 50 is movably disposed in the valve needle main cavity 21 , and the valve module further includes a valve needle spring 60 , which is disposed in the valve needle main cavity 21 , and applies elastic force to the small valve needle 50 toward the pressure relief port 311 .

[0053] The present invention arranges a valve needle spring 60 between the moving iron core 20 and the small valve needle 50, thereby preventing the moving iron core 20 from directly transmitting the force of the return spring 40 to the small valve needle 50. During the closing process of the solenoid valve, the elastic force of the return spring 40 is prevented from causing a large impact on the pressure relief port 311 through the small valve needle 50, thereby ensuring the sealing at the pressure relief port 311 under long-term use, thereby ensuring the flow accuracy of the solenoid valve and improving the service life; in the present invention, the impact on the pressure relief port 311 is determined by the spring force applied by the valve needle spring 60 to the small valve needle 50, and the elastic modulus of the valve needle spring 60 and the return spring 40 can be adjusted to ensure that the force at the pressure relief port 311 is smaller than the force at the pilot valve port 13; the valve needle spring 60 is arranged to apply an elastic force toward the pressure relief port 311 to the small valve needle 50, thereby ensuring the stability and reliability of the small valve needle 50 when closing the pressure relief port 311.

[0054] like Figure 1 and Figure 2 As shown, specifically, the elastic force provided by the return spring 40 to the moving iron core 20 is greater than the elastic force provided by the valve needle spring 60 to the small valve needle 50. This arrangement not only ensures the reliability and rapidity of the piston assembly 30 opening and closing the pilot valve port 13, but also further reduces the impact of the small valve needle 50 on the pressure relief port 311.

[0055] It should be noted that: Figure 3 , Figure 4 and Figure 5 The continuous process of the valve module closing the pilot valve port 13 is shown in sequence.

[0056] like Figure 1 and Figure 2As shown, when the moving iron core 20 and the small valve needle 50 move synchronously toward the piston assembly 30 until the small valve needle 50 contacts the piston assembly 30, the elastic force of the return spring 40 is F1, the elastic force of the valve needle spring 60 is f1, and F1>5f1. This arrangement ensures that the moving iron core 20 moves quickly under the action of the return spring 40, and contacts the piston assembly 30 after the small valve needle 50 contacts the pressure relief port 311.

[0057] It is worth noting that: Figure 1 and Figure 2 As shown, the valve module further includes an electromagnetic assembly 70, which controls the axial movement of the moving iron core 20 through electromagnetic force; Figure 3 As shown, when the electromagnetic assembly 70 does not generate electromagnetic force, the small valve needle 50 moves toward the pressure relief port 311, and the moving iron core 20 moves toward the piston assembly 30 synchronously. When the small valve needle 50 just contacts the piston assembly 30, the return spring 40 provides an elastic force F1 to the moving iron core 20, and the valve needle spring 60 provides an elastic force f1 to the small valve needle 50.

[0058] In a specific embodiment of the present invention, Figure 1 As shown, the electromagnetic assembly 70 includes an attractor 71 , at least a portion of which is disposed in the first accommodating cavity 11 and cooperates with the inner wall of the first accommodating cavity 11 ; the other end of the return spring 40 abuts against the attractor 71 .

[0059] like Figure 3 As shown, the original length of the return spring 40 is set to H0, and the stiffness (ie, elastic modulus) is K. Figure 3 H1 in the figure shows the length of the return spring 40 at that time, and the spring force F1 of the return spring 40 at that time is equal to K (H0-H1); the original length of the valve needle spring 60 is set to h0, and the stiffness (i.e., elastic modulus) is k. Figure 3 h1 in FIG. 6 shows the length of the valve needle spring 60 at that time, and the spring force f1 of the valve needle spring 60 at that time is f1=k(h0-h1).

[0060] like Figure 4 As shown, when the moving iron core 20 moves toward the piston assembly 30 until the moving iron core 20 contacts the piston assembly 30, the elastic force of the return spring 40 is F2, the elastic force of the valve needle spring 60 is f2, and F2>3.5f2. This arrangement ensures that the moving iron core 20 moves quickly toward the piston assembly 30 under the action of the return spring 40.

[0061] It is worth noting that: Figure 4As shown, after the small valve needle 50 closes the pressure relief port 311, the small valve needle 50 and the piston assembly 30 are relatively still, and the moving iron core 20 moves toward the piston assembly 30 (until it abuts against the piston assembly 30). When the moving iron core 20 just contacts the piston assembly 30, the return spring 40 provides an elastic force F2 to the moving iron core 20, and the valve needle spring 60 provides an elastic force f2 to the small valve needle 50.

[0062] like Figure 4 As shown, it is known that the original length of the return spring 40 is H0, and the stiffness (ie, elastic modulus) is K. Figure 4 H2 in the figure shows the length of the return spring 40 at that time, and the spring force F2 of the return spring 40 at that time is F2 = K (H0-H2); it is known that the original length of the valve needle spring 60 is h0, and the stiffness (i.e., elastic modulus) is k. Figure 4 h2 in FIG. 6 shows the length of the valve needle spring 60 at that time, and the spring force f2 of the valve needle spring 60 at that time is f2 = k (h0 - h2).

[0063] like Figure 5 As shown, when the moving iron core 20, the small valve needle 50 and the piston assembly 30 synchronously move toward the pilot valve port 13 until the piston assembly 30 contacts the pilot valve port 13, the elastic force of the return spring 40 is F3, the elastic force of the valve needle spring 60 is f3, and F3>2f3. This arrangement ensures the rapidity and reliability of the small valve needle 50, the moving iron core 20 and the piston assembly 30 jointly moving the pilot valve port 13, and ensures that when the valve needle spring 60 applies elastic force to the small valve needle 50 (opening or closing the pressure relief port 311), the state of the moving iron core 20 is not affected by the elastic force of the valve needle spring 60.

[0064] It is worth noting that: Figure 5 As shown, after the moving iron core 20 abuts against the piston assembly 30, the small valve needle 50, the moving iron core 20 and the piston assembly 30 are relatively still, and the small valve needle 50, the moving iron core 20 and the piston assembly 30 move toward the pilot valve port 13 together. When the piston assembly 30 just contacts the pilot valve port 13, the elastic force provided by the return spring 40 to the moving iron core 20 is F3, and the elastic force provided by the valve needle spring 60 to the small valve needle 50 is f3.

[0065] like Figure 5 As shown, it is known that the original length of the return spring 40 is H0, and the stiffness (ie, elastic modulus) is K. Figure 5 H3 in the figure shows the length of the return spring 40 at that time, and the spring force F3 of the return spring 40 at that time is F3 = K (H0-H3); it is known that the original length of the valve needle spring 60 is h0, and the stiffness (ie, elastic modulus) is k. Figure 5The h3 in it shows the current length of the valve needle spring 60. At this time, the spring force f3 of the valve needle spring 60 = k(h0 - h3); then F3 > 2f3. It can be known that since the small valve needle 50 is relatively stationary with respect to the moving iron core 20, the deformation amount of the valve needle spring 60 remains unchanged at this time, h3 = h2, and the applied elastic force also remains unchanged, f3 = f2.

[0066] In summary, F1>5f1, F2>3.5f2, and F3>2f3 are the conditions that need to be satisfied at the three moments when the small valve needle 50 just touches the pressure relief port 311, the moving iron core 20 just touches the piston assembly 30, and the piston assembly 30 just touches the pilot valve port 13 respectively. Meeting the above conditions can better realize these movement processes, enabling the three processes of the small valve needle 50 touching the pressure relief port 311, the moving iron core 20 touching the piston assembly 30, and the piston assembly 30 touching the pilot valve port 13 to be completed smoothly and continuously.

[0067] It should be noted that: Figure 6 、 Figure 7 and Figure 8 successively show the continuous process of the valve module opening the pilot valve port 13. As Figure 6 shown, at this time, the small valve needle 50 closes the pressure relief port 311, the moving iron core 20 abuts against the piston assembly 30, and the piston assembly 30 closes the pilot valve port 13. Figure 6 The L5 in it represents the maximum stroke of the moving iron core 20; starting from the state of Figure 6 , the pilot valve port 13 is opened; as Figure 7 shown, at this time, the small valve needle 50 starts to open the pressure relief port 311, the moving iron core 20 is separated from the piston assembly 30, and the piston assembly 30 still closes the pilot valve port 13. Figure 7 The L7 in it represents the stroke of the moving iron core 20 after moving upward, and L7 < L5; as Figure 8 shown, at this time, the small valve needle 50 completely opens the pressure relief port 311, the moving iron core 20 continues to be separated from the piston assembly 30, and the piston assembly 30 completely opens the pilot valve port 13. Figure 8 The L6 in it represents the maximum stroke of the piston assembly 30, that is, the maximum distance from the pilot valve port 13.至此, the complete opening of the pilot valve port 13 is completed.

[0068] As Fig. 9 shown, the maximum axial deformation amount of the valve needle spring 60 is not less than the maximum axial length of the part of the small valve needle 50 extending out of the total valve needle cavity 21. Such a setting ensures that the small valve needle 50 does not directly contact the moving iron core 20 in terms of structure, thereby effectively preventing the moving iron core 20 from directly conducting the force of the return spring 40 to the small valve needle 50.

[0069] It should be noted that: As Fig. 9As shown in the figure, L1 represents the maximum deformation of the valve needle spring 60 in the axial direction, and L2 represents the maximum length of the small valve needle 50 extending out of the valve needle total cavity 21 in the axial direction, and L1 is not less than L2.

[0070] like Figure 2 and Fig. 9 As shown, the end of the moving iron core 20 close to the piston assembly 30 has a protrusion 23, which is used to abut against the piston assembly 30, and at least a part of the valve needle total cavity 21 is located in the protrusion 23. This arrangement is conducive to increasing the length of the valve needle total cavity 21 and increasing the stroke of the small valve needle 50. When opening the valve, the idle stroke of the moving iron core 20 is larger, which is more conducive to opening the valve.

[0071] Specifically, the area formed by the protrusion 23 and the piston assembly 30 is not less than the area formed by the pilot valve port 13 and the piston assembly 30 (for example, the area of ​​the pressure relief port 311). This arrangement is conducive to ensuring that the piston assembly 30 is subjected to uniform force and prolonging the service life of the piston assembly 30.

[0072] like Figure 2 As shown, the valve module further includes a retaining spring 120, which is disposed in the piston cavity 12 (e.g., fixed in the piston cavity 12 by clamping), and the piston assembly 30 is located between the pilot valve port 13 and the retaining spring 120, and the retaining spring 120 is used to axially limit the piston assembly 30. By providing the retaining spring 120, the piston assembly 30 is effectively limited to an upper limit position ( Figure 2 The stroke of the piston assembly 30 is thereby limited.

[0073] like Fig. 9 As shown, the valve needle total cavity 21 includes a first spring cavity 211, a fluid channel 212 and a valve needle cavity 213 which are connected in sequence; the moving iron core 20 also has a balancing channel 22 inside, one end of which is connected to the first accommodating cavity 11, and the other end of which is connected to any one of the first spring cavity 211, the fluid channel 212 and the valve needle cavity 213. By providing the balancing channel 22, the pressure change in the valve needle total cavity 21 is ensured to be stable, thereby ensuring the movement reliability of the moving iron core 20 in the first accommodating cavity 11.

[0074] like Figure 2 and Fig. 9 As shown, the valve module further includes a first gasket 80, which is fixed on the moving iron core 20, and the first gasket 80 cooperates with the small valve needle 50 to limit the displacement of the small valve needle 50 toward the piston assembly 30. By providing the first gasket 80, the axial limit of the small valve needle 50 is ensured, and the movement stroke of the small valve needle 50 is effectively constrained.

[0075] It is worth noting that: Figure 2 and Fig. 9As shown, the first gasket 80 is arranged at the outlet of the valve needle main cavity 21, and is limitedly matched with the inner wall of the valve needle main cavity 21; the first gasket 80 is sleeved on the outer periphery of the small valve needle 50, and one end face is limitedly matched with the small valve needle 50 to axially limit the small valve needle 50; the other end face of the first gasket 80 is axially limitedly matched with the end of the moving iron core 20 close to the small valve needle 50 through riveting. By setting the riveting method, the reliable constraint of the first gasket 80 is guaranteed.

[0076] like Figure 2 and Fig.10 As shown, the piston assembly 30 includes a piston body 32 and a sealing block 33. The piston body 32 has a limiting cavity inside. The sealing block 33 is arranged in the limiting cavity and is limitedly matched with the inner wall of the limiting cavity; the piston channel 31 is arranged in the sealing block 33; wherein, when the piston assembly 30 is in a state of closing the pilot valve port 13, the sealing block 33 abuts against the pilot valve port 13 (the sealing block 33 is used to abut against the pilot valve port 13 to close the pilot valve port 13). Such a setting not only ensures the simplification of the structure of the piston assembly 30 and effectively reduces the cost, but also ensures that the pilot valve port 13 is less impacted (because the sealing block 33 abuts against the pilot valve port 13, rather than the piston body 32); the sealing block 33 can be made of elastic material (for example: rubber) to further reduce the impact on the pilot valve port 13.

[0077] like Fig.10 As shown, one end of the sealing block 33 facing the small valve needle 50 and one end of the piston body 32 facing the small valve needle 50 are axially limitedly matched by riveting. The riveting method is convenient for installation and processing.

[0078] It is worth noting that: in a specific embodiment of the present invention, Figure 1 As shown, the valve assembly 10 includes a valve seat 14 and a sleeve 15; the valve seat 14 has a piston chamber 12 and a pilot valve port 13 inside; the sleeve 15 has a first accommodating chamber 11 inside, and the sleeve 15 is arranged on the valve seat 14; the electromagnetic assembly 70 is arranged on the sleeve 15; the moving iron core 20 is limitedly matched with the inner wall of the first accommodating chamber 11; at least a part of the return spring 40 is arranged in the first spring chamber 211, and one end abuts against the bottom wall of the first spring chamber 211 to provide elastic force for the moving iron core 20 in the axial direction of the moving iron core 20; the piston assembly 30 is limitedly matched with the inner wall of the piston chamber 12; at least a part of the small valve needle 50 is movably arranged in the valve needle chamber 213, and is limitedly matched with the inner wall of the valve needle chamber 213; at least a part of the valve needle spring 60 is arranged in the valve needle chamber 213, and one end abuts against the top wall of the valve needle chamber 213, and the other end abuts against the small valve needle 50.

[0079] like Figure 1As shown, the present invention also provides a solenoid valve, including the above-mentioned valve module, the solenoid valve also includes: a valve body 90, which has a first installation cavity 91, a first pressure channel 92 connected to the first installation cavity 91, a second pressure channel 93 connected to the first installation cavity 91, a first flow port 94 that can be connected to the first installation cavity 91, and a second flow port 95 connected to the first installation cavity 91; a switch assembly 100, which is movably arranged (for example: elastically arranged) in the first installation cavity 91, and is used to control the connection or disconnection between the first flow port 94 and the second flow port 95; the valve module is arranged on the valve body 90, through The on-off assembly 100 is controlled to control the connection or disconnection between the first flow port 94 and the second flow port 95; the first pressure channel 92 is connected to the piston chamber 12; wherein, the first installation chamber 91 is divided into a left chamber and a right chamber by the on-off assembly 100, and the on-off assembly 100 is driven to reciprocate through the pressure difference change in the left chamber and the right chamber; the first pressure channel 92 is connected to the right chamber; the second pressure channel 93 is used to connect the left chamber and the right chamber; the first flow port 94 is connected to the pilot valve port 13; the second flow port 95 is connected to the left chamber; the first flow port 94 is a fluid outlet, and the second flow port 95 is a fluid inlet.

[0080] like Figure 1 As shown, when the piston assembly 30 is in the state of opening the pilot valve port 13, the fluid in the right side cavity of the first installation cavity 91 enters the first flow port 94 through the first pressure channel 92, the piston cavity 12, and the pilot valve port 13 in sequence, and the pressure in the right side cavity of the first installation cavity 91 decreases. Under the action of the pressure difference (the pressure difference between the left cavity and the right cavity), the on-off assembly 100 moves to the right, and the first flow port 94 and the second flow port 95 are connected; when the piston assembly 30 is in the state of closing the pilot valve port 13, the fluid in the second flow port 95 enters the right side cavity through the gap between the on-off assembly 100 and the first installation cavity 91, and the pressure of the left cavity and the right cavity is gradually balanced. An elastic member is also arranged in the right side cavity, and the elastic member provides an elastic force for the on-off assembly 100 to move toward the left cavity. Therefore, under the action of the elastic member, the on-off assembly 100 moves to the left, disconnecting the connection between the first flow port 94 and the second flow port 95.

[0081] The solenoid valve proposed in the present invention effectively avoids the elastic force of the return spring 40 from causing a large impact on the pressure relief port 311 through the small valve needle 50, thereby ensuring the sealing of the pressure relief port 311 under long-term use, thereby ensuring the flow accuracy of the solenoid valve and improving its service life. At the same time, it also makes the working noise of the solenoid valve lower.

[0082] like Figure 1As shown, the solenoid valve also includes a one-way valve 110, which is movably arranged in the second pressure channel 93. The one-way valve 110 is used to ensure the one-way flow of the fluid in the second pressure channel 93, and the one-way flow direction of the fluid in the second pressure channel 93 is from the right cavity to the left cavity; by setting the one-way valve 110, when the on-off assembly 100 moves to the right, the first flow port 94 and the second flow port 95 are connected, and there is an abnormal situation that the pressure of the right cavity is greater than the pressure of the left cavity, under the action of the pressure of the right cavity, the one-way valve 110 moves so that the fluid in the right cavity can enter the left cavity through the second pressure channel 93, so as to achieve the effect of rapid pressure relief of the right cavity and improve the stability of the connection between the first flow port 94 and the second flow port 95.

[0083] It should be noted that: in a specific embodiment of the present invention, the one-way valve 110 adopts an existing common one-way valve structure to facilitate procurement, subsequent replacement and maintenance.

[0084] In summary, the present invention provides a valve module and a solenoid valve. The present invention arranges a valve needle spring 60 between the moving iron core 20 and the small valve needle 50, thereby preventing the moving iron core 20 from directly transmitting the force of the return spring 40 to the small valve needle 50. During the closing process of the solenoid valve, the elastic force of the return spring 40 is prevented from causing a large impact on the pressure relief port 311 through the small valve needle 50, thereby ensuring the sealing of the pressure relief port 311 under long-term use, thereby ensuring the flow accuracy of the solenoid valve and improving its service life. In the present invention, the impact on the pressure relief port 311 is caused by the valve needle spring 60 on the small valve needle It is determined by the spring force applied by the valve needle 50. The elastic modulus of the valve needle spring 60 and the return spring 40 can be adjusted to ensure that the force at the pressure relief port 311 is smaller than the force at the pilot valve port 13. The valve needle spring 60 is arranged to apply an elastic force toward the pressure relief port 311 to the small valve needle 50, thereby ensuring the stability and reliability of the small valve needle 50 when closing the pressure relief port 311. The moving iron core 20 is arranged to directly abut the piston assembly 30, thereby ensuring that the elastic force of the return spring 40 can act on the piston assembly 30 through the moving iron core 20, thereby making the switching of the solenoid valve reliable.

[0085] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0086] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0087] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0088] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0089] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0090] The above description is only a preferred embodiment of the present invention and is 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 in the protection scope of the present invention.

Claims

1. A valve module, characterized in that: include: A valve assembly (10), wherein the valve assembly (10) comprises a first accommodating chamber (11), a piston chamber (12) and a pilot valve port (13) which are arranged in sequence; A movable iron core (20) is movably arranged in the first accommodating cavity (11), and the movable iron core (20) has a valve needle main cavity (21); A piston assembly (30) is movably disposed in the piston chamber (12), and the piston assembly (30) is used to open and close the pilot valve port (13); the piston assembly (30) has a through piston channel (31), one end of the piston channel (31) is a pressure relief port (311), and the other end is connected to the pilot valve port (13); a return spring (40) disposed in the first accommodating chamber (11), the return spring (40) applying an elastic force to the moving iron core (20) toward the piston assembly (30); A small valve needle (50), arranged in the valve needle main cavity (21), the small valve needle (50) being used to open and close the pressure relief port (311); Wherein, when the pilot valve port (13) is in a closed state, the moving iron core (20) can abut against the piston assembly (30), and the small valve needle (50) closes the pressure relief port (311).

2. The valve module according to claim 1, characterized in that The small valve needle (50) is movably arranged in the valve needle total cavity (21); the valve module also includes a valve needle spring (60), and the valve needle spring (60) is arranged in the valve needle total cavity (21), and the valve needle spring (60) applies an elastic force to the small valve needle (50) toward the pressure relief port (311).

3. The valve module according to claim 2, characterized in that The elastic force provided by the return spring (40) to the moving iron core (20) is greater than the elastic force provided by the valve needle spring (60) to the small valve needle (50).

4. The valve module according to claim 3, characterized in that When the moving iron core (20) and the small valve needle (50) move synchronously toward the piston assembly (30) until the small valve needle (50) contacts the piston assembly (30), the elastic force of the return spring (40) is F1, and the elastic force of the valve needle spring (60) is f1, and F1>5f1.

5. The valve module according to claim 3, characterized in that: When the movable iron core (20) moves toward the piston assembly (30) until the movable iron core (20) contacts the piston assembly (30), the elastic force of the return spring (40) is F2, the elastic force of the valve needle spring (60) is f2, and F2>3.5f2.

6. The valve module according to claim 3, characterized in that: When the moving iron core (20), the small valve needle (50) and the piston assembly (30) move synchronously toward the pilot valve port (13) until the piston assembly (30) contacts the pilot valve port (13), the elastic force of the return spring (40) is F3, and the elastic force of the valve needle spring (60) is f3. F3>2f3.

7. The valve module according to claim 2, characterized in that: The maximum axial deformation of the valve needle spring (60) is not less than the maximum axial length of the portion of the small valve needle (50) extending out of the valve needle main cavity (21).

8. The valve module according to claim 1, characterized in that The movable iron core (20) has a protrusion (23) at one end close to the piston assembly (30), and the protrusion (23) is used to abut against the piston assembly (30), and at least a part of the valve needle main cavity (21) is located in the protrusion (23).

9. The valve module according to claim 8, characterized in that The area formed by the abutment between the protrusion (23) and the piston assembly (30) is not less than the area formed by the abutment between the pilot valve port (13) and the piston assembly (30).

10. The valve module according to claim 1, characterized in that The valve module further comprises a retaining spring (120), wherein the retaining spring (120) is arranged in the piston cavity (12), and the piston assembly (30) is located between the pilot valve port (13) and the retaining spring (120), and the retaining spring (120) is used for axially limiting the piston assembly (30).

11. The valve module according to claim 1, characterized in that The valve needle total cavity (21) includes a first spring cavity (211), a fluid channel (212) and a valve needle cavity (213) which are connected in sequence; the movable iron core (20) also has a balancing channel (22) inside, one end of the balancing channel (22) is connected to the first accommodating cavity (11), and the other end of the balancing channel (22) is connected to any one of the first spring cavity (211), the fluid channel (212) and the valve needle cavity (213).

12. The valve module according to claim 2, characterized in that The valve module further comprises a first gasket (80), wherein the first gasket (80) is fixed on the movable iron core (20), and the first gasket (80) cooperates with the small valve needle (50) to limit the displacement of the small valve needle (50) toward the piston assembly (30).

13. The valve module according to claim 1, characterized in that The piston assembly (30) comprises a piston body (32) and a sealing block (33); the piston body (32) has a limiting cavity inside, and the sealing block (33) is fixed in the limiting cavity; the piston channel (31) is arranged in the sealing block (33); the sealing block (33) is used to abut and cooperate with the pilot valve port (13) to close the pilot valve port (13).

14. A solenoid valve, characterized in that: The valve module comprising any one of claims 1 to 13, wherein the solenoid valve further comprises: A valve body (90) having a first installation cavity (91), a first pressure channel (92) communicating with the first installation cavity (91), a second pressure channel (93) communicating with the first installation cavity (91), a first flow port (94) communicable with the first installation cavity (91), and a second flow port (95) communicating with the first installation cavity (91); A switching assembly (100) is movably disposed in the first installation cavity (91) and is used to control the connection or disconnection between the first flow port (94) and the second flow port (95); The valve module is arranged on the valve body (90), and controls the connection or disconnection between the first flow port (94) and the second flow port (95) by controlling the on-off assembly (100); the first pressure channel (92) is connected to the piston chamber (12); The first installation cavity (91) is divided into a left cavity and a right cavity by the on-off assembly (100), and the on-off assembly (100) is driven to reciprocate by the pressure difference change between the left cavity and the right cavity; the first pressure channel (92) is connected to the right cavity; the second pressure channel (93) is used to connect the left cavity and the right cavity; the first flow port (94) is connected to the pilot valve port (13); the second flow port (95) is connected to the left cavity; the first flow port (94) is a fluid outlet, and the second flow port (95) is a fluid inlet.

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