Valve module and solenoid valve

Abstract

The application provides a valve module and an electromagnetic valve, wherein the valve module comprises: a valve assembly, the valve assembly having a first accommodating cavity, a piston cavity and a pilot valve port; a moving iron core movably arranged in the first accommodating cavity, the moving iron core having a valve needle total cavity; a piston assembly for opening and closing 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 of the piston channel being in communication with the pilot valve port; a return spring arranged in the first accommodating cavity, the return spring exerting elastic force on the moving iron core; a small valve needle arranged in the valve needle total cavity; wherein in a state in which 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 application ensures that the elastic force of the return spring can act on the piston assembly through the moving iron core, and thus the electromagnetic valve switch is reliable. The application avoids that the elastic force of the return spring directly produces a large impact on the pressure relief port, and ensures the sealing of the pressure relief port in long-term use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a valve module and an electromagnetic valve. BACKGROUND

[0002] At present, for the sealing of the valve port of the electromagnetic valve, generally speaking, the larger the size of the valve port, the greater the sealing force required, therefore, the conventional electromagnetic valve adopts a spring with relatively large elastic force to provide the elastic force; the conventional electromagnetic valve applies the elastic force to the iron core through the spring, 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, so as to control the piston assembly to close the guide valve port; however, because the inner diameters of the pressure relief port and the guide valve port are different, the forces (i.e. the elastic forces) borne by the pressure relief port and the guide valve port are the same, therefore, in the process of closing the electromagnetic valve, the impact of the elastic force on the pressure relief port through the valve needle is large, which will affect the sealing at the pressure relief port in the long run, and further affect the flow accuracy and service life of the electromagnetic valve. SUMMARY

[0003] The present application provides an electromagnetic valve to solve the problem that in the prior art, in the process of closing the electromagnetic valve, the impact of the elastic force on the pressure relief port through the valve needle is large, which will affect the sealing at the pressure relief port in the long run, and further affect the flow accuracy and service life of the electromagnetic valve.

[0004] In order to solve the above problems, according to one aspect of the present application, a valve module is provided, comprising: a valve assembly, the valve assembly having a first accommodating cavity, a piston cavity and a guide valve port arranged in sequence; a moving iron core movably arranged in the first accommodating cavity, the moving iron core having a valve needle total cavity; a piston assembly movably arranged in the piston cavity, the piston assembly being used for opening and closing the guide 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 of the piston channel being in communication with the guide valve port; a return spring arranged in the first accommodating cavity, the return spring applying an elastic force to the moving iron core towards the piston assembly; a small valve needle arranged in the valve needle total cavity, the small valve needle being used for opening and closing the pressure relief port; wherein, in the state that the guide valve port is closed, the moving iron core is capable of abutting against the piston assembly, and the small valve needle closes the pressure relief port.

[0005] Further, the small valve needle is movably arranged in the valve needle total cavity; the valve module further comprises a valve needle spring, the valve needle spring being arranged in the valve needle total cavity, and the valve needle spring applying an elastic force to the small valve needle towards the pressure relief port.

[0006] Further, 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 are synchronously moved to 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 to the piston assembly to contact 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] Further, when the moving iron core, the small valve needle and the piston assembly move to the piston assembly to contact the 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] Further, the maximum axial deformation of the valve needle spring is not less than the maximum axial length of the small valve needle extending out of the valve needle total cavity.

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

[0012] Further, the area formed by the abutment of the protruding part and the piston assembly is not less than the area formed by the abutment of the valve port and the piston assembly.

[0013] Further, the valve module further comprises a snap spring, the snap spring is arranged in the piston cavity, the piston assembly is located between the valve port and the snap spring, and the snap spring is used to axially limit the piston assembly.

[0014] Further, the valve needle total cavity comprises a first spring cavity, a fluid channel and a valve needle cavity which are sequentially communicated; the moving iron core further has a balance channel inside, one end of the balance channel is communicated with the first accommodating cavity, and the other end of the balance channel is communicated with any one of the first spring cavity, the fluid channel and the valve needle cavity.

[0015] Further, the valve module further comprises a first gasket, the first gasket is fixed on the moving iron core, and the first gasket is limited to cooperate with the small valve needle to limit the displacement of the small valve needle to the piston assembly.

[0016] Further, the piston assembly comprises a piston body and a sealing block, the inside of the piston body has a limiting cavity, and the sealing block is fixed in the limiting cavity; the piston channel is arranged in the sealing block; and the sealing block is used to abut against the valve port to close the valve port.

[0017] According to another aspect of the present application, an electromagnetic valve is provided, comprising the valve module described above, the electromagnetic valve further comprising: a valve body having a first mounting cavity, a first pressure channel communicating with the first mounting cavity, a second pressure channel communicating with the first mounting cavity, a first flow passage communicating with the first mounting cavity, and a second flow passage communicating with the first mounting cavity; an on-off assembly movably arranged in the first mounting cavity and configured to control the communication or disconnection between the first flow passage and the second flow passage; the valve module is arranged on the valve body and controls the communication or disconnection between the first flow passage and the second flow passage by controlling the on-off assembly; the first pressure channel communicates with the piston cavity; wherein the first mounting cavity is divided into a left cavity and a right cavity by the on-off assembly, and the on-off assembly is driven to reciprocate by the pressure difference change in the left cavity and the right cavity; the first pressure channel communicates with the right cavity; the second pressure channel is configured to communicate the left cavity and the right cavity; the first flow passage communicates with the pilot port; the second flow passage communicates with the left cavity; the first flow passage is a fluid outlet, and the second flow passage is a fluid inlet.

[0018] According to the technical solution of the present application, the present application provides a valve module, comprising: a valve assembly, the valve assembly having a first accommodating cavity, a piston cavity and a pilot port arranged in sequence; a moving iron core movably arranged in the first accommodating cavity, the moving iron core having a valve needle total cavity; a piston assembly movably arranged in the piston cavity, the piston assembly being configured to open and close the pilot port; the piston assembly having a through piston channel, one end of the piston channel being a pressure relief port, and the other end of the piston channel communicating with the pilot port; a return spring arranged in the first accommodating cavity, the return spring applying a spring force to the moving iron core towards the piston assembly; a small valve needle arranged in the valve needle total cavity, the small valve needle being configured to open and close the pressure relief port; wherein in a state where the pilot 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 application directly abuts the moving iron core and the piston assembly, which ensures that the spring force of the return spring can act on the piston assembly through the moving iron core, and thus the opening and closing of the electromagnetic valve is reliable. In the valve closing process of the electromagnetic valve, the present application avoids that the spring force of the return spring directly produces a large impact on the pressure relief port, which ensures the sealing of the pressure relief port in long-term use, and thus ensures the flow accuracy of the electromagnetic valve and improves the service life. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the present application illustrated in the drawings are presented by way of example or for purpose of explanation only. In the drawings:

[0020] Figure 1 An internal structure schematic diagram of an electromagnetic valve provided by an embodiment of the present application is shown;

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

[0022] Figure 3 Fig. 2 shows the internal structure of the valve module in the first stage of the closing process of the pilot valve port according to an embodiment of the present application;

[0023] Figure 4 Fig. 3 shows the internal structure of the valve module in the second stage of the closing process of the pilot valve port according to an embodiment of the present application;

[0024] Figure 5 Fig. 4 shows the internal structure of the valve module in the third stage of the closing process of the pilot valve port according to an embodiment of the present application;

[0025] Figure 6 Fig. 5 shows the internal structure of the valve module in the first stage of the opening process of the pilot valve port according to an embodiment of the present application;

[0026] Figure 7 Fig. 6 shows the internal structure of the valve module in the second stage of the opening process of the pilot valve port according to an embodiment of the present application;

[0027] Figure 8 Fig. 7 shows the internal structure of the valve module in the third stage of the opening process of the pilot valve port according to an embodiment of the present application;

[0028] Figure 9 Fig. 8 shows the cooperation between the moving iron core and the small valve needle according to an embodiment of the present application;

[0029] Figure 10 Fig. 9 shows the internal structure of the piston assembly according to an embodiment of the present application.

[0030] In the above drawings, the following reference signs are used:

[0031] 10, valve assembly; 11, first accommodating cavity; 12, piston cavity; 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 passage; 213, valve needle cavity; 22, balance passage; 23, protrusion;

[0033] 30, piston assembly; 31, piston passage; 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 assembly; 71, attractor;

[0038] 80, first gasket;

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

[0040] 100, on-off assembly;

[0041] 110, one-way valve;

[0042] 120, snap spring. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to 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, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0044] As shown in Figures 1 to 10 the embodiments of the present application provide a valve module, comprising:

[0045] a valve assembly 10, the valve assembly 10 has a first containing cavity 11, a piston cavity 12 and a pilot valve port 13 arranged in sequence;

[0046] a moving iron core 20 movably arranged in the first containing cavity 11, the moving iron core 20 has a valve needle total cavity 21;

[0047] a piston assembly 30 movably arranged in the piston cavity 12, the piston assembly 30 is used for opening and closing 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 communicated with the pilot valve port 13;

[0048] a return spring 40 arranged in the first containing cavity 11, the return spring 40 applies a spring force to the moving iron core 20 towards the piston assembly 30;

[0049] a small valve needle 50 arranged in the valve needle total cavity 21, the small valve needle 50 is used for opening and closing the pressure relief port 311;

[0050] wherein, in the state that 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 application can ensure that the elastic force of the return spring 40 can act on the piston assembly 30 through the moving iron core 20, so that the opening and closing of the electromagnetic valve is reliable. In the process of closing the electromagnetic valve, the application avoids that the elastic force of the return spring 40 directly impacts the pressure relief port 311, ensures the sealing of the pressure relief port 311 in long-term use, and further ensures the flow accuracy of the electromagnetic valve and improves the service life.

[0052] As shown in Figure 1 and Figure 2 , the small valve needle 50 is movably arranged in the valve needle total cavity 21, and the valve module further comprises a valve needle spring 60 arranged in the valve needle total cavity 21, the valve needle spring 60 applies an elastic force to the small valve needle 50 towards the pressure relief port 311.

[0053] The application sets the valve needle spring 60 between the moving iron core 20 and the small valve needle 50, avoids that the moving iron core 20 directly transmits the force of the return spring 40 to the small valve needle 50, avoids that the elastic force of the return spring 40 directly impacts the pressure relief port 311 through the small valve needle 50 in the process of closing the electromagnetic valve, ensures the sealing of the pressure relief port 311 in long-term use, and further ensures the flow accuracy of the electromagnetic valve and improves the service life; the impact on the pressure relief port 311 in the application is determined by the spring force of the valve needle spring 60 applied to the small 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 less than the force at the pilot port 13; the valve needle spring 60 is arranged to apply an elastic force to the small valve needle 50 towards the pressure relief port 311, which ensures the stability and reliability of the small valve needle 50 when closing the pressure relief port 311.

[0054] As shown in Figure 1 and Figure 2 , 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. In this way, the reliability and rapidity of the piston assembly 30 for opening and closing the pilot port 13 are ensured, and the impact of the small valve needle 50 on the pressure relief port 311 is further reduced.

[0055] It should be noted that: Figure 3 , Figure 4 and Figure 5 sequentially show the continuous process of the valve module closing the pilot port 13.

[0056] As shown in Figure 1 and Figure 2As shown, when the moving iron core 20 and the small valve needle 50 move synchronously towards 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, where F1 > 5f1. This arrangement ensures that the moving iron core 20 moves rapidly under the action of the return spring 40, and that it abuts against the piston assembly 30 only 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 also includes an electromagnetic component 70, which controls the axial movement of the moving iron core 20 via electromagnetic force; as Figure 3 As shown, when the electromagnetic component 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 simultaneously. When the small valve needle 50 just contacts the piston assembly 30, the spring force provided by the return spring 40 to the moving iron core 20 is F1, and the spring force provided by the valve needle spring 60 to the small valve needle 50 is f1.

[0058] In one specific embodiment of the present invention, such as Figure 1 As shown, the electromagnetic component 70 includes an attractor 71, at least a portion of which is disposed within the first receiving cavity 11 and engages with the inner wall of the first receiving 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 its stiffness (i.e., elastic modulus) is set to K. Figure 3 H1 in the figure shows the current length of the return spring 40, then the spring force F1 of the return spring 40 at this time is K(H0-H1); Let the original length of the valve needle spring 60 be h0, and its stiffness (i.e., elastic modulus) be k, then... Figure 3 h1 in the figure shows the length of the valve needle spring 60 at that time, then the spring force of the valve needle spring 60 at this time is f1 = k(h0-h1).

[0060] like Figure 4 As shown, when the moving iron core 20 moves towards the piston assembly 30 and contacts the piston assembly 30, the spring force of the return spring 40 is F2, and the spring force of the valve needle spring 60 is f2, where F2 > 3.5f2. This arrangement ensures that the moving iron core 20 moves rapidly 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 stationary, and the moving iron core 20 moves toward the piston assembly 30 (until it comes into contact with the piston assembly 30). When the moving iron core 20 just contacts the piston assembly 30, the spring force provided by the return spring 40 to the moving iron core 20 is F2, and the spring force provided by the valve needle spring 60 to the small valve needle 50 is f2.

[0062] like Figure 4 As shown, the original length of the return spring 40 is H0, and its stiffness (i.e., elastic modulus) is K. Figure 4 H2 in the figure shows the original length of the return spring 40. Therefore, the spring force F2 of the return spring 40 at this time is F2 = K(H0 - H2). Given that the original length of the valve needle spring 60 is h0 and its stiffness (i.e., elastic modulus) is k, at this time... Figure 4 h2 in the figure shows the length of the valve needle spring 60 at that time, then the spring force of the valve needle spring 60 at this 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 to 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 valve needle spring 60 is f3, where F3 > 2f3. This configuration ensures the speed and reliability of the joint movement of the small valve needle 50, the moving iron core 20, and the piston assembly 30 to the pilot valve port 13, and also ensures that when the valve needle spring 60 applies a spring force to the small valve needle 50 (when the pressure relief port 311 is opened or closed), the state of the moving iron core 20 is not affected by the spring force of the valve needle spring 60.

[0064] It is worth noting that: such as Figure 5 As shown, after the moving iron core 20 comes into contact with the piston assembly 30, the small valve needle 50, the moving iron core 20 and the piston assembly 30 are relatively stationary. The small valve needle 50, the moving iron core 20 and the piston assembly 30 move together to guide the valve port 13. When the piston assembly 30 just contacts the guide valve port 13, the spring force provided by the return spring 40 to the moving iron core 20 is F3, and the spring force provided by the valve needle spring 60 to the small valve needle 50 is f3.

[0065] like Figure 5 As shown, the original length of the return spring 40 is H0, and its stiffness (i.e., elastic modulus) is K. Figure 5 H3 in the figure shows the original length of the return spring 40. Therefore, the spring force F3 of the return spring 40 at this time is K(H0-H3). Given that the original length of the valve needle spring 60 is h0 and its stiffness (i.e., elastic modulus) is k, at this time... Figure 5The h3 in it shows the length of the valve needle spring 60 at that time. At this time, the spring force f3 of the valve needle spring 60 = k(h0 - h3); then F3 > 2f3; it can be known that because 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; satisfying the above conditions can better realize these movement processes, so that 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 can be completed coherently and smoothly.

[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 to open the pilot valve port 13; 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 disengaged 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 fully opens the pressure relief port 311, the moving iron core 20 continues to be disengaged from the piston assembly 30, and the piston assembly 30 fully 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.至此完成了导阀口13的完全开启。

[0068] 如 Figure 9 所示,阀针弹簧60在轴向上的最大形变量不小于小阀针50伸出阀针总腔21部分在轴向上的最大长度。这样设置,在结构上保证了小阀针50不与运动铁芯20直接接触,进而有效避免了运动铁芯20将回复弹簧40的力直接传导至小阀针50上。

[0069] 需要说明的是:如 Figure 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 cavity 21 in the axial direction. L1 is not less than L2.

[0070] As shown in the figure, Figure 2 and Figure 9 The protruding portion 23 of the moving iron core 20 is arranged close to the piston assembly 30, and at least a part of the valve needle cavity 21 is arranged in the protruding portion 23. In this way, the length of the valve needle cavity 21 is increased, the stroke of the small valve needle 50 is increased, the idle stroke of the moving iron core 20 is larger when the valve is opened, and the valve opening is facilitated.

[0071] Specifically, the area formed by the protruding portion 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). In this way, the uniform force on the piston assembly 30 is ensured, and the service life of the piston assembly 30 is improved.

[0072] As shown in the figure, Figure 2 The valve module further comprises a circlip 120 arranged in the piston cavity 12 (for example, clamped and fixed in the piston cavity 12), and the piston assembly 30 is arranged between the pilot valve port 13 and the circlip 120. The circlip 120 is used to axially limit the piston assembly 30. By arranging the circlip 120, the piston assembly 30 is effectively limited in the upward direction, and the stroke of the piston assembly 30 is limited. Figure 2

[0073] As shown in the figure, Figure 9 The valve needle cavity 21 comprises a first spring cavity 211, a fluid passage 212 and a valve needle cavity 213 which are sequentially communicated. The moving iron core 20 further comprises a balance passage 22, one end of the balance passage 22 is communicated with the first containing cavity 11, and the other end of the balance passage 22 is communicated with any one of the first spring cavity 211, the fluid passage 212 and the valve needle cavity 213. By arranging the balance passage 22, the pressure change in the valve needle cavity 21 is stable, and the movement reliability of the moving iron core 20 in the first containing cavity 11 is ensured.

[0074] As shown in the figure, Figure 2 and Figure 9 The valve module further comprises a first gasket 80 fixed on the moving iron core 20, and the first gasket 80 is limited in position with the small valve needle 50 to limit the displacement of the small valve needle 50 in the direction of the piston assembly 30. By arranging the first gasket 80, the axial position of the small valve needle 50 is ensured, and the movement stroke of the small valve needle 50 is effectively limited.

[0075] It is worth noting that: Figure 2 and Figure 9 ​As shown in the figure, the first gasket 80 is arranged at the outlet in the valve needle total cavity 21 and is in position-limiting cooperation with the inner wall of the valve needle total cavity 21; the first gasket 80 is sleeved on the outer periphery of the small valve needle 50 and one end face is in position-limiting cooperation with the small valve needle 50 to axially limit the small valve needle 50; the other end face of the first gasket 80 is in axial position-limiting cooperation with the end of the moving iron core 20 close to the small valve needle 50 through riveting. Through the arrangement of the riveting mode, the reliable constraint of the first gasket 80 is ensured.

[0076] As shown in the figure, Figure 2 and Figure 10 the piston assembly 30 comprises a piston body 32 and a sealing block 33, the inside of the piston body 32 has a limiting cavity, the sealing block 33 is arranged in the limiting cavity and is in position-limiting cooperation with the inner wall of the limiting cavity; the piston channel 31 is arranged in the sealing block 33; wherein, in the state that the piston assembly 30 closes the pilot valve port 13, the sealing block 33 is in abutting cooperation with the pilot valve port 13 (the sealing block 33 is used to abut the pilot valve port 13 to close the pilot valve port 13). Through such an arrangement, the structure of the piston assembly 30 is simplified, the cost is effectively reduced, and the impact on the pilot valve port 13 is small (because the sealing block 33 abuts the pilot valve port 13, not 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] As shown in the figure, Figure 10 the end of the sealing block 33 close to the small valve needle 50 is in axial position-limiting cooperation with the end of the piston body 32 close to the small valve needle 50 through riveting. Through the riveting mode, the installation and processing are facilitated.

[0078] It is worth noting that: in one specific embodiment of the present application, as shown in the figure, Figure 1 the valve assembly 10 comprises a valve seat 14 and a sleeve 15; the inside of the valve seat 14 has a piston cavity 12 and a pilot valve port 13; the inside of the sleeve 15 has a first containing cavity 11, 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 in position-limiting cooperation with the inner wall of the first containing cavity 11; at least a part of the return spring 40 is arranged in the first spring cavity 211 and one end abuts the bottom wall of the first spring cavity 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 in position-limiting cooperation with the inner wall of the piston cavity 12; at least a part of the small valve needle 50 is movably arranged in the valve needle cavity 213 and is in position-limiting cooperation with the inner wall of the valve needle cavity 213; at least a part of the valve needle spring 60 is arranged in the valve needle cavity 213 and one end abuts the top wall of the valve needle cavity 213 and the other end abuts the small valve needle 50.

[0079] As shown in the figure, Figure 1As shown, the present invention also provides a solenoid valve, including the valve module described above. The solenoid valve further includes: a valve body 90, which internally has a first mounting cavity 91, a first pressure channel 92 communicating with the first mounting cavity 91, a second pressure channel 93 communicating with the first mounting cavity 91, a first flow port 94 communicating with the first mounting cavity 91, and a second flow port 95 communicating with the first mounting cavity 91; an on / off assembly 100, movably disposed (e.g., elastically disposed) within the first mounting cavity 91, for controlling the connection or disconnection between the first flow port 94 and the second flow port 95; the valve module is disposed on the valve body 90, and through... The on / off control assembly 100 controls 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 mounting chamber 91 is divided into a left chamber and a right chamber by the on / off control assembly 100, and the on / off control assembly 100 is driven to reciprocate by 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 the fluid outlet, and the second flow port 95 is the fluid inlet.

[0080] like Figure 1 As shown, when the piston assembly 30 is in the open pilot valve port 13 state, the fluid in the right chamber of the first mounting cavity 91 enters the first flow port 94 sequentially through the first pressure channel 92, the piston cavity 12, and the pilot valve port 13. The pressure in the right chamber of the first mounting cavity 91 decreases. Under the action of the pressure difference (the pressure difference between the left and right chambers), the switching 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 closed pilot valve port 13 state, the fluid in the second flow port 95 enters the right chamber through the gap between the switching assembly 100 and the first mounting cavity 91. The pressure in the left and right chambers gradually balances. An elastic element is also provided in the right chamber. The elastic element provides an elastic force to the switching assembly 100 to move to the left chamber. Therefore, under the action of the elastic element, the switching 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 this invention effectively avoids the return spring 40 from causing a large impact on the pressure relief port 311 through the small valve needle 50, 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 operating noise of the solenoid valve lower.

[0082] like Figure 1As shown, the electromagnetic valve further comprises a one-way valve 110 movably arranged in the second pressure channel 93. The one-way valve 110 is used to ensure the one-way flow of fluid in the second pressure channel 93, and the one-way flow direction of fluid in the second pressure channel 93 is from the right side cavity to the left side cavity. By arranging 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 when the pressure in the right side cavity is greater than the pressure in the left side cavity, the one-way valve 110 moves under the action of the pressure in the right side cavity, so that the fluid in the right side cavity can enter the left side cavity through the second pressure channel 93, thereby achieving the effect of rapid pressure relief of the right side cavity and improving the stability of the connection between the first flow port 94 and the second flow port 95.

[0083] It should be noted that in one embodiment of the present application, the one-way valve 110 adopts a common one-way valve structure, so as to facilitate procurement, subsequent replacement and maintenance.

[0084] In summary, the present application provides a valve module and an electromagnetic valve. By arranging the valve needle spring 60 between the moving iron core 20 and the small valve needle 50, the force of the return spring 40 is not directly transmitted to the small valve needle 50, and in the process of closing the electromagnetic valve, the elastic force of the return spring 40 does not produce 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, and further ensuring the flow accuracy of the electromagnetic valve and prolonging the service life. In the present application, the impact on the pressure relief port 311 is determined by the spring force of the valve needle spring 60 acting on 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 less than the force at the pilot port 13. By arranging the valve needle spring 60 to exert a spring force on the small valve needle 50 towards the pressure relief port 311, the stability and reliability of the small valve needle 50 when closing the pressure relief port 311 are ensured. By arranging the moving iron core 20 to directly abut against the piston assembly 30, the elastic force of the return spring 40 can be transmitted to the piston assembly 30 through the moving iron core 20, thereby ensuring the reliable opening and closing of the electromagnetic valve.

[0085] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0086] The foregoing is considered as illustrative only of the principles of the application. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the application to the exact construction and practice described. Accordingly, all such variations are intended to be included within the scope of the present application as defined in the following claims, along with full equivalents thereof.

[0087] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "horizontal", "top", "bottom", and the like are generally based on the orientation or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the components themselves.

[0088] For the convenience of description, spatial relative terms such as "above", "upper", "top", "up", "lower", "bottom", and the like can be used herein to describe the spatial position relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0089] In addition, it should be noted that the use of the terms "first", "second", and the like do not have a special meaning, and are merely used to distinguish the corresponding components, and therefore should not be construed as limiting the scope of protection of the present application.

[0090] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A valve module, characterized in that, include: The valve assembly (10) has a first receiving cavity (11), a piston cavity (12) and a pilot valve port (13) arranged sequentially. A moving iron core (20) is movably disposed within the first receiving cavity (11), and the moving iron core (20) has a valve needle main cavity (21). A piston assembly (30) is movably disposed within 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) is disposed in the first receiving cavity (11), and the return spring (40) applies a spring force toward the piston assembly (30) to the moving iron core (20); A small valve needle (50) is disposed in the valve needle main cavity (21), and the small valve needle (50) is used to open and close the pressure relief port (311). 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). The small valve needle (50) is movably disposed within the valve needle main cavity (21); the valve module also includes a valve needle spring (60), which is disposed within the valve needle main cavity (21) and applies a spring force to the small valve needle (50) toward the pressure relief port (311); The restoring spring (40) provides a greater elastic force to the moving iron core (20) than the valve needle spring (60) provides to the small valve needle (50); 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 cavity (21).

2. The valve module according to claim 1, 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, the elastic force of the valve needle spring (60) is f1, and F1>5f1.

3. The valve module according to claim 1, characterized in that, 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, and the elastic force of the valve needle spring (60) is f2, where F2 > 3.5f2.

4. The valve module according to claim 1, 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.

5. The valve module according to claim 1, characterized in that, The moving iron core (20) has a protrusion (23) at one end near the piston assembly (30), the protrusion (23) being used to abut against the piston assembly (30), and at least a portion of the valve needle cavity (21) being located within the protrusion (23).

6. The valve module according to claim 5, characterized in that, The area formed by the protrusion (23) and the piston assembly (30) at the point of contact is not less than the area formed by the valve port (13) and the piston assembly (30) at the point of contact.

7. The valve module according to claim 1, characterized in that, The valve module also includes a retaining ring (120), which is disposed in the piston chamber (12). The piston assembly (30) is located between the pilot valve port (13) and the retaining ring (120). The retaining ring (120) is used to axially limit the piston assembly (30).

8. The valve module according to claim 1, characterized in that, The valve needle cavity (21) includes a first spring cavity (211), a fluid channel (212), and a valve needle cavity (213) connected in sequence; the moving iron core (20) also has a balance channel (22), one end of which is connected to the first receiving 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).

9. The valve module according to claim 1, characterized in that, The valve module also includes a first gasket (80), which is fixed on the moving iron core (20). The first gasket (80) is in a limiting fit with the small valve needle (50) to limit the displacement of the small valve needle (50) toward the piston assembly (30).

10. The valve module according to claim 1, characterized in that, The piston assembly (30) includes 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 disposed in the sealing block (33). The sealing block (33) is used to abut against the pilot valve port (13) to close the pilot valve port (13).

11. A solenoid valve, characterized in that, The solenoid valve includes the valve module according to any one of claims 1 to 10, and further includes: The valve body (90) has a first mounting cavity (91), a first pressure channel (92) communicating with the first mounting cavity (91), a second pressure channel (93) communicating with the first mounting cavity (91), a first flow port (94) communicating with the first mounting cavity (91), and a second flow port (95) communicating with the first mounting cavity (91). A switching component (100) is movably disposed within the first mounting 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 disposed 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 mounting cavity (91) is divided into a left cavity and a right cavity by the on / off assembly (100). The on / off assembly (100) is driven to reciprocate by the pressure difference 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 the fluid outlet and the second flow port (95) is the fluid inlet.

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