Valve Modules and Solenoid Valves

Abstract

The invention proposes a valve module and a solenoid valve. The valve module consists of: a valve unit (10), a valve unit (10) with a piston chamber (12) and a control valve gate (13); a movable iron core (20), a movable iron core (20) with a main valve needle chamber (21); a piston unit (30), a piston unit (30) designed to open and close the control valve gate (13), a piston unit (30) with a through piston groove (31), one end of the piston groove (31) acting as a pressure relief gate (311), and the other end of the piston groove (31) connected to the control valve gate (13); a return spring (40), a return spring (40) exerting elastic force on the movable iron core (20); and a small valve needle (50) arranged in the main valve needle chamber (21).

Description

Valve modules and solenoid valves

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on July 31, 2023, with application number 202310957770.4 and titled “Valve Module and Solenoid Valve”. Technical Field

[0002] The present application relates to the field of valve technology, and in particular to a valve module and a solenoid valve. Background Art

[0003] 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, thereby affecting the flow accuracy and service life of the solenoid valve.

[0004] Application Contents

[0005] The present application provides a solenoid valve to solve the problem in the prior art that during the closing process of the solenoid valve, the elastic force passing through the valve has a large impact on the pressure relief port, which may affect the sealing at the pressure relief port after long-term use, thereby affecting the flow accuracy and service life of the solenoid valve.

[0006] In order to solve the above problems, according to one aspect of the present application, the present application provides a valve module, including: a valve assembly, the valve assembly having 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 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 channel, one end of the piston channel 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.

[0007] 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.

[0008] 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.

[0009] Furthermore, 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.

[0010] Furthermore, 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.

[0011] Furthermore, when the moving iron core, the small valve needle and the piston assembly move synchronously 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.

[0012] Furthermore, the maximum deformation 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.

[0013] Furthermore, one end of the moving iron core close to the piston assembly has a protrusion, which is used to abut against the piston assembly, and at least a part of the valve needle main cavity is located in the protrusion.

[0014] Furthermore, the area formed by the abutment between the protrusion and the piston assembly is not smaller than the area formed by the abutment between the pilot valve port and the piston assembly.

[0015] 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.

[0016] 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.

[0017] According to another aspect of the present application, a solenoid valve is provided, including 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; a switching 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 controls the connection or disconnection between the first flow port and the second flow port by controlling the switching 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 switching component, and the pressure difference between the left cavity and the right cavity changes, driving the switching component to reciprocate; 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 application, the present application provides a valve module, including: a valve assembly, the valve assembly having 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 having a valve needle main 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 channel, one end of the piston channel 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 main 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. By arranging that the moving iron core and the piston assembly can directly abut, the present application ensures that the elastic force of the return spring can act on the piston assembly through the moving iron core, thereby making the switching of the solenoid valve reliable. During the solenoid valve closing process, the present application avoids the elastic force of the return spring from directly exerting a large impact on the pressure relief port, thereby ensuring the sealing of the pressure relief port under long-term use, thereby ensuring the flow accuracy of the solenoid valve and improving its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0020] FIG1 shows a schematic diagram of the internal structure of a solenoid valve provided in an embodiment of the present application;

[0021] FIG2 shows a schematic diagram of the internal structure of a valve module provided in an embodiment of the present application;

[0022] FIG3 is a schematic diagram showing the internal structure of the valve module provided by an embodiment of the present application during the first process of closing the pilot valve port;

[0023] FIG4 is a schematic diagram showing the internal structure of the valve module provided by an embodiment of the present application during the second closing process of the pilot valve port;

[0024] FIG5 is a schematic diagram showing the internal structure of the valve module provided by an embodiment of the present application during the third process of closing the pilot valve port;

[0025] FIG6 is a schematic diagram showing the internal structure of the valve module provided by an embodiment of the present application during the first process of opening the pilot valve port;

[0026] FIG7 is a schematic diagram showing the internal structure of the valve module provided by an embodiment of the present application during the second process of opening the pilot valve port;

[0027] FIG8 is a schematic diagram showing the internal structure of the valve module provided by an embodiment of the present application during the third process of opening the pilot valve port;

[0028] FIG9 shows a schematic diagram of the cooperation between the moving iron core and the small valve needle provided in an embodiment of the present application;

[0029] FIG10 shows a schematic diagram of the internal structure of the piston assembly provided in an embodiment of the present application.

[0030] The above drawings include the following reference numerals: 10, valve assembly; 11, first accommodating chamber; 12, piston chamber; 13, pilot valve port; 14, valve seat; 15, sleeve; 20, moving iron core; 21, valve needle main chamber; 211, first spring chamber; 212, fluid channel; 213, valve needle chamber; 22, balancing channel; 23, protrusion; 30, piston assembly; 31, piston channel; 311, pressure relief port; 32, piston body; 33, sealing block; 40, return spring; 50, small valve needle; 60, valve needle spring; 70, electromagnetic assembly; 71, attractor; 80, first gasket; 90, valve body; 91, first mounting chamber; 92, first pressure channel; 93, second pressure channel; 94, first flow port; 95, second flow port; 100, on-off assembly; 110, one-way valve; 120. Circlip. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0032] As shown in Figures 1 to 10, an embodiment of the present application provides a valve module, including: a valve assembly 10, the valve assembly 10 having a first accommodating chamber 11, a piston chamber 12 and a pilot valve port 13 arranged in sequence; a moving iron core 20, movably arranged in the first accommodating chamber 11, the moving iron core 20 having a valve needle total chamber 21; a piston assembly 30, movably arranged in the piston chamber 12, the piston assembly 30 being used to open and close the pilot valve port 13; the piston assembly 30 having a through piston channel 31, one end of the piston channel 31 being a pressure relief port 311, and the other end being connected to the pilot valve port 13; a return spring 40, arranged in the first accommodating chamber 11, the return spring 40 applying an elastic force toward the piston assembly 30 on the moving iron core 20; a small valve needle 50, arranged in the valve needle total chamber 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 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.

[0033] By providing direct contact between the moving iron core 20 and the piston assembly 30, 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 ensuring reliable opening and closing of the solenoid valve. During the solenoid valve closing process, the present invention prevents the elastic force of the return spring 40 from directly impacting the pressure relief port 311, ensuring a seal at the pressure relief port 311 during long-term use, thereby maintaining flow accuracy and extending the service life of the solenoid valve.

[0034] As shown in Figures 1 and 2, the small valve needle 50 is movably arranged in the valve needle main cavity 21. The valve module also includes a valve needle spring 60, which is arranged in the valve needle main cavity 21. The valve needle spring 60 applies an elastic force to the small valve needle 50 toward the pressure relief port 311.

[0035] The present application sets 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 solenoid valve closing process, 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 application, 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; by setting the valve needle spring 60 to apply an elastic force toward the pressure relief port 311 to the small valve needle 50, the stability and reliability of the small valve needle 50 when closing the pressure relief port 311 are guaranteed.

[0036] As shown in Figures 1 and 2 , the elastic force exerted by the return spring 40 on the moving core 20 is greater than the elastic force exerted by the valve needle spring 60 on the small valve needle 50. This arrangement ensures the reliability and rapidity with which the piston assembly 30 opens and closes the pilot valve port 13 while further reducing the impact of the small valve needle 50 on the pressure relief port 311.

[0037] It should be noted that FIG. 3 , FIG. 4 and FIG. 5 sequentially illustrate the continuous process of the valve module closing the pilot valve port 13 .

[0038] As shown in Figures 1 and 2 , when the moving 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 spring force of the return spring 40 is F1, and the spring force of the valve needle spring 60 is f1, with F1 > 5f1. This arrangement ensures that the moving core 20 rapidly moves under the action of the return spring 40 and abuts the piston assembly 30 only after the small valve needle 50 contacts the pressure relief port 311.

[0039] It is worth noting that: as shown in Figures 1 and 2, the valve module also includes an electromagnetic assembly 70, which controls the axial movement of the moving iron core 20 through electromagnetic force; as shown in Figure 3, 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.

[0040] In a specific embodiment of the present application, as shown in Figure 1, 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.

[0041] As shown in Figure 3, the original length of the return spring 40 is set to H0, and the stiffness (i.e., elastic modulus) is set to K. At this time, H1 in Figure 3 shows the current length of the return spring 40, and the spring force F1 of the return spring 40 at this time is F1 = K (H0-H1); the original length of the valve needle spring 60 is set to h0, and the stiffness (i.e., elastic modulus) is set to k. At this time, h1 in Figure 3 shows the current length of the valve needle spring 60, and the spring force f1 of the valve needle spring 60 at this time is f1 = k (h0-h1).

[0042] As shown in Figure 4 , when the moving core 20 moves toward the piston assembly 30 until it contacts the piston assembly 30, the spring force of the return spring 40 is F2, and the spring force of the needle spring 60 is f2, with F2 > 3.5f2. This arrangement ensures that the moving core 20, under the action of the return spring 40, quickly moves toward the piston assembly 30.

[0043] It is worth noting that: as shown in Figure 4, after the small valve needle 50 closes the pressure relief port 311, the small valve needle 50 and the piston assembly 30 are relatively stationary, 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 elastic force provided by the return spring 40 to the moving iron core 20 is F2, and the elastic force provided by the valve needle spring 60 to the small valve needle 50 is f2.

[0044] As shown in Figure 4, it is known that the original length of the return spring 40 is H0, and the stiffness (i.e., elastic modulus) is K. At this time, H2 in Figure 4 shows the length of the return spring 40 at that time, and the spring force F2 of the return spring 40 at this 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. At this time, h2 in Figure 4 shows the length of the valve needle spring 60 at that time, and the spring force f2 of the valve needle spring 60 at this time is f2 = k (h0-h2).

[0045] As shown in Figure 5, when the moving core 20, small valve needle 50, and piston assembly 30 synchronously move toward the pilot valve port 13 until the piston assembly 30 contacts the pilot valve port 13, the spring force of the return spring 40 is F3, and the spring force of the needle spring 60 is f3, with F3 > 2f3. This arrangement ensures the rapid and reliable movement of the small valve needle 50, the moving core 20, and the piston assembly 30 in conjunction with the pilot valve port 13. It also ensures that when the needle spring 60 applies a force to the small valve needle 50 (opening or closing the pressure relief port 311), the state of the moving core 20 is not affected by the spring force of the needle spring 60.

[0046] It is worth noting that: as shown in Figure 5, 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 stationary, 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.

[0047] As shown in Figure 5, it is known that the original length of the return spring 40 is H0, and the stiffness (i.e., elastic modulus) is K. At this time, H3 in Figure 5 shows the current length of the return spring 40, and the spring force F3 of the return spring 40 at this time is F3 = K (H0-H3); it is known that the original length of the valve needle spring 60 is h0, and the stiffness (i.e., elastic modulus) is k. At this time, h3 in Figure 5 shows the current length of the valve needle spring 60, and the spring force f3 of the valve needle spring 60 at this time is f3 = k (h0-h3); then F3>2f3; it can be known that, because the small valve needle 50 and the moving iron core 20 are relatively stationary, the deformation of the valve needle spring 60 is unchanged at this time, h3 = h2, and the applied elastic force is also unchanged, f3 = f2.

[0048] 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, making 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 be completed smoothly and continuously.

[0049] It should be noted that Figures 6, 7, and 8 successively show the continuous process of the valve module opening the pilot valve port 13. As shown in Figure 6, 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. L5 in Figure 6 represents the maximum stroke of the moving iron core 20; starting from the state in Figure 6 to open the pilot valve port 13; as shown in Figure 7, at this time, the small valve needle 50 starts to open the pressure relief port 311, the moving iron core 20 disengages from the piston assembly 30, and the piston assembly 30 still closes the pilot valve port 13. L7 in Figure 7 represents the stroke of the moving iron core 20 after moving upward, and L7 < L5; as shown in Figure 8, at this time, the small valve needle 50 fully opens the pressure relief port 311, the moving iron core 20 continues to disengage from the piston assembly 30, and the piston assembly 30 fully opens the pilot valve port 13. L6 in Figure 8 represents the maximum stroke of the piston assembly 30, that is, the maximum distance from the pilot valve port 13.至此完成了导阀口13的完全开启。至此, the full opening of the pilot valve port 13 is completed.

[0050] As shown in Figure 9, the maximum axial deformation 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. With this setting, it is ensured structurally that the small valve needle 50 does not directly contact the moving iron core 20, thereby effectively preventing the moving iron core 20 from directly transmitting the force of the return spring 40 to the small valve needle 50.

[0051] It should be noted that: as shown in Figure 9, L1 in the figure represents the maximum axial deformation of the valve needle spring 60, L2 represents the maximum axial length of the part of the small valve needle 50 extending out of the total valve needle cavity 21, and L1 is not less than L2.

[0052] As shown in Figures 2 and 9, one end of the moving iron core 20 close to the piston assembly 30 has a protrusion 23, and the protrusion 23 is used to abut against the piston assembly 30. At least a part of the total valve needle cavity 21 is located within the protrusion 23. With this setting, it is beneficial to increase the length of the total valve needle cavity 21, increase the stroke of the small valve needle 50, and when opening the valve, the idle stroke of the moving iron core 20 is larger, which is more conducive to opening the valve.

[0053] Specifically, the area formed by the contact between the protrusion 23 and the piston assembly 30 is not less than the area formed by the contact between the pilot valve port 13 and the piston assembly 30 (for example, the area of ​​the pressure relief port 311). This arrangement helps ensure that the force applied to the piston assembly 30 is uniform and increases the service life of the piston assembly 30.

[0054] As shown in FIG2 , the valve module further includes a retaining spring 120 disposed within the piston cavity 12 (e.g., secured thereto by a clip). The piston assembly 30 is located between the pilot valve port 13 and the retaining spring 120. The retaining spring 120 serves to axially limit the piston assembly 30. The retaining spring 120 effectively limits the piston assembly 30 to an upper position (upward in FIG2 ), thereby limiting the travel of the piston assembly 30.

[0055] As shown in Figure 9, the valve needle cavity 21 includes a first spring cavity 211, a fluid channel 212, and a valve needle cavity 213, which are sequentially connected. The moving core 20 also has a balancing channel 22 within it. One end of the balancing channel 22 communicates with the first accommodating cavity 11, and the other end of the balancing channel 22 communicates with any one of the first spring cavity 211, the fluid channel 212, and the valve needle cavity 213. The provision of the balancing channel 22 ensures stable pressure changes within the valve needle cavity 21, thereby ensuring reliable movement of the moving core 20 within the first accommodating cavity 11.

[0056] As shown in Figures 2 and 9, the valve module further includes a first gasket 80, which is fixed to the moving iron core 20. 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. The provision of the first gasket 80 ensures axial limitation of the small valve needle 50, effectively restricting the travel of the small valve needle 50.

[0057] It is worth noting that, as shown in Figures 2 and 9 , the first gasket 80 is positioned at the outlet of the valve needle main cavity 21 and engages with the inner wall of the valve needle main cavity 21. The first gasket 80 is sleeved over the outer circumference of the small valve needle 50, with one end surface engaging with the small valve needle 50 to axially constrain the small valve needle 50. The other end surface of the first gasket 80 engages with the end of the moving iron core 20 proximal to the small valve needle 50 through riveting for axial restraint. This riveting ensures reliable restraint of the first gasket 80.

[0058] As shown in Figures 2 and 10, 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 limited by the inner wall of the limiting cavity. The piston channel 31 is arranged in the sealing block 33. When the piston assembly 30 is in the state of closing the pilot valve port 13, the sealing block 33 abuts and cooperates with the pilot valve port 13 (the sealing block 33 is used to abut and cooperate with the pilot valve port 13 to close the pilot valve port 13). This arrangement not only ensures the structural simplification of the piston assembly 30 and effectively reduces costs, but also ensures that the pilot valve port 13 is less impacted (because the sealing block 33 abuts and cooperates with the pilot valve port 13, rather than the piston body 32). The sealing block 33 can be made of an elastic material (for example, rubber) to further reduce the impact on the pilot valve port 13.

[0059] As shown in Figure 10, the end of the sealing block 33 facing the small valve needle 50 and the end of the piston body 32 facing the small valve needle 50 are axially limited by riveting. The riveting method is convenient for installation and processing.

[0060] It is worth mentioning that in a specific embodiment of the present application, as shown in FIG1 , the valve assembly 10 includes a valve seat 14 and a sleeve 15; the valve seat 14 has a piston cavity 12 and a pilot valve port 13 inside; the sleeve 15 has a first accommodating cavity 11 inside, and the sleeve 15 is disposed on the valve seat 14; the electromagnetic assembly 70 is disposed on the sleeve 15; the moving iron core 20 is limitedly engaged with the inner wall of the first accommodating cavity 11; at least a portion of the return spring 40 is disposed in the first spring cavity 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 limited in cooperation 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 limited in cooperation 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.

[0061] As shown in FIG1 , the present application further provides a solenoid valve, including the above-mentioned valve module, and the solenoid valve further includes: a valve body 90, which has 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; an on-off assembly 100, which is movably arranged (for example, elastically arranged) in the first installation cavity 91 for controlling 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, The connection or disconnection between the first flow port 94 and the second flow port 95 is controlled by controlling the on-off component 100; 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 component 100, and the pressure difference between the left chamber and the right chamber changes, driving the on-off component 100 to reciprocate; 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.

[0062] As shown in Figure 1, 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 gradually balances. An elastic member is also provided in the right side cavity, which 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 first flow port 94 and the second flow port 95.

[0063] The solenoid valve proposed in the present application 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 during 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.

[0064] As shown in Figure 1, 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 chamber to the left chamber. By setting the one-way valve 110, when the on-off assembly 100 moves to the right and the first flow port 94 and the second flow port 95 are connected, if the pressure of the right chamber is greater than that of the left chamber, the one-way valve 110 moves under the action of the pressure of the right chamber so that the fluid in the right chamber can enter the left chamber through the second pressure channel 93, so as to achieve the effect of rapid pressure relief of the right chamber and improve the stability of the connection between the first flow port 94 and the second flow port 95.

[0065] It should be noted that: in a specific embodiment of the present application, the one-way valve 110 adopts an existing common one-way valve structure to facilitate procurement, subsequent replacement and maintenance.

[0066] In summary, the present application provides a valve module and a solenoid valve, which prevents the moving iron core 20 from directly transmitting the force of the return spring 40 to the small valve needle 50 by arranging a valve needle spring 60 between the moving iron core 20 and the small valve needle 50. During the closing process of the solenoid valve, the elastic force of the return spring 40 is prevented from having 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 application, 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 set 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 set 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.

[0067] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

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, the elastic force of the valve needle spring (60) is f3, and 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. A solenoid valve, characterized in that: The valve module according to any one of claims 1 to 11, 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), movably disposed in the first installation cavity (91), and used for controlling 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.

Images