Liquid supplementing valve

Abstract

The utility model provides a liquid supplementing valve. The liquid supplementing valve comprises a lower shell, a first-stage valve seat and a second-stage valve seat. The outer wall of the first-stage valve seat is provided with an outer side sealing face. The secondary valve seat is located in the lower shell and comprises a shoulder part protruding inwards from the inner wall of the lower shell, the top of the shoulder part is provided with an inner side sealing face, and the inner side sealing face can be in contact fit with the outer side sealing face. Wherein the shoulder part of the secondary valve seat is integrally formed on the inner wall of the lower shell, and the minimum height of the shoulder part in the axial direction is larger than the wall thickness of any one of the upper sleeve and the lower sleeve of the lower shell in the radial direction. According to the fluid infusion valve, the lower shell and the secondary valve seat are integrally formed, so that the manufacturing error and the assembly tolerance caused by independently manufacturing the lower shell and the secondary valve seat are avoided, and the purchasing and assembly cost is saved. In addition, the secondary valve seat is formed by folding metal, and has good strength on the premise that the sealing effect is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle braking systems, and more particularly to a fluid replenishment valve. BACKGROUND

[0002] Fluid replenishment valves are commonly used to replenish brake fluid, such as brake oil, to vehicle braking systems. Existing fluid replenishment valves generally include two stages of valve seats, and by controlling the two stages of valve seats to open a first stage of valve seat and a second stage of valve seat step by step, a fluid inlet and a fluid outlet are connected through different fluid passages. SUMMARY

[0003] The present application provides a fluid replenishment valve, which includes a lower housing, a first stage of valve seat, and a second stage of valve seat. The lower housing includes an upper sleeve and a lower sleeve connected together, and the upper sleeve and the lower sleeve extend along a common axial direction. The first stage of valve seat is arranged in the lower housing and is arranged to be movable along the axial direction, and an outer wall of the first stage of valve seat has an outer sealing surface. The second stage of valve seat is arranged at a connection between the upper sleeve and the lower sleeve, and the second stage of valve seat includes a shoulder portion protruding inward from an inner wall of the lower housing, wherein a top of the shoulder portion has an inner sealing surface, and the inner sealing surface is arranged to be in contact with the outer sealing surface. Wherein the shoulder portion of the second stage of valve seat is integrally formed on the inner wall of the lower housing, and a minimum height of the shoulder portion along the axial direction is greater than a wall thickness of any one of the upper sleeve and the lower sleeve along a radial direction.

[0004] According to the above, a bottom end of the upper sleeve is inwardly folded to form an upper sleeve folded edge, and a top end of the lower sleeve is inwardly folded to form a lower sleeve folded edge, wherein the shoulder portion is formed by overlapping the upper sleeve folded edge and the lower sleeve folded edge, and wherein the inner sealing surface is arranged on an inner wall of the upper sleeve folded edge.

[0005] According to the above, a folding length of the upper sleeve folded edge is greater than a folding length of the lower sleeve folded edge.

[0006] According to the above, a diameter of the lower sleeve is less than a diameter of the upper sleeve.

[0007] According to the above, the second stage of valve seat is integrally formed with the lower housing through a deep drawing process.

[0008] According to the above, the outer sealing surface is located on a circumferential wall of a bottom of the first stage of valve seat, and the outer sealing surface extends obliquely from outside to inside in an axial direction from top to bottom; and the inner sealing surface is located on a circumferential wall of a top of the shoulder portion, and the inner sealing surface extends obliquely from outside to inside in the axial direction from top to bottom.

[0009] Based on the above, the maximum height of the shoulder along the axial direction is the sum of the radial wall thicknesses of the upper sleeve and the lower sleeve of the lower housing.

[0010] Based on the above, the primary valve seat has a fluid passage. The replenishing valve has a fluid inlet and a fluid outlet. The primary valve seat is configured to open or close; when the primary valve seat is open, the fluid passage connects the fluid inlet and the fluid outlet; and when the primary valve seat is closed, the fluid passage disconnects the fluid inlet and the fluid outlet.

[0011] According to the above, an annular channel exists between the outer sealing surface of the primary valve seat and the inner sealing surface of the secondary valve seat. The secondary valve seat is configured to open or close. When the secondary valve seat is open, the outer sealing surface moves away from the inner sealing surface, allowing the annular channel to connect the fluid inlet and the fluid outlet. When the secondary valve seat is closed, the outer sealing surface contacts the inner sealing surface, allowing the annular channel to disconnect the fluid inlet and the fluid outlet.

[0012] According to the above, the replenishing valve further includes a fixed iron core and a moving iron core, a first spring, and a switching element. The moving iron core is disposed between the fixed iron core and the primary valve seat, wherein the moving iron core is axially movable relative to the fixed iron core to approach or move away from the primary valve seat. The first spring extends axially and is elastically connected between the fixed iron core and the moving iron core to provide an axial elastic force to the moving iron core. The switching element is connected to the moving iron core. The fixed iron core and the moving iron core are configured such that, with the movement of the moving iron core, the switching element can connect or disconnect the fluid passage to open or close the primary valve seat.

[0013] According to the above, the replenishing valve further includes a guide sleeve, which is fixedly connected to the moving iron core to move with the movement of the moving iron core. The guide sleeve is disposed between the primary valve seat and the lower housing, and includes a through hole through which the fluid passage is in fluid communication with the fluid inlet. The replenishing valve also includes a second spring, which extends axially and is elastically connected between the primary valve seat and the guide sleeve to provide an axial spring force to the primary valve seat. The secondary valve seat is configured to open or close based on the pressure difference between the fluid inlet and the fluid outlet and the spring force of the second spring.

[0014] Other objects and advantages of this application will become apparent from the following description of the application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the application. Attached Figure Description

[0015] Figure 1A This is a perspective view of a replenishing valve according to an embodiment of this application at one angle;

[0016] Figure 1B yes Figure 1A The front view of the replenishing valve shown;

[0017] Figure 1C yes Figure 1A An exploded view of the replenishing valve shown;

[0018] Figure 1D yes Figure 1B The diagram shows a cross-sectional view of the replenishment valve along line AA.

[0019] Figure 2 yes Figure 1A The diagram shows a cross-sectional view of the replenishing valve with the primary valve seat open.

[0020] Figure 3 yes Figure 1A The diagram shows a cross-sectional view of the replenishing valve with the secondary valve seat open.

[0021] Before detailing the embodiments of this disclosure, it should be understood that this disclosure is not intended to limit its application to the details of the construction and arrangement of the components set forth in the following description or shown in the accompanying drawings. This disclosure is capable of other embodiments and can be practiced or implemented in a variety of different ways. Moreover, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” and “including” and variations thereof is intended to cover all items listed thereafter and their equivalents, as well as additional items and their equivalents. Detailed Implementation

[0022] Various specific embodiments of this application will now be described with reference to the accompanying drawings, which form part of this specification. It should be understood that although directional terms such as "front," "rear," "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer" are used in this application to describe various exemplary structural parts and elements, their use is merely for illustrative purposes and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this application can be arranged in different orientations, these directional terms are for illustrative purposes only and should not be considered limiting. Where possible, the same or similar reference numerals used in this application refer to the same parts.

[0023] Figure 1A-1D The structure of a replenishing valve 100 according to one embodiment of this application is shown. Figure 1A This diagram shows a three-dimensional view of the replenishing valve 100 at one angle. Figure 1B The front view of the replenishment valve 100 is shown. Figure 1C An exploded view of the replenishment valve 100 is shown. Figure 1D A cross-sectional view of the replenishment valve 100 along line AA is shown. Figure 1A-1D As shown, the replenishing valve 100 includes an upper housing 101 and a lower housing 110 connected to each other. The upper housing 101 is generally a cylindrical sleeve shape with a closed top and an open bottom, and defines an axis i. The exterior of the upper housing 101 is used to mount a coil (not shown) for electromagnetic engagement with a magnetic component inside the upper housing 101. The lower housing 110 is fixedly connected below the upper housing 101, and the top edge of the lower housing 110 is connected to the bottom opening of the upper housing 101. The lower housing 110 is provided with a fluid inlet 102 for fluid inflow and a fluid outlet 103 for fluid outflow. The lower housing 110 includes an upper sleeve 111 and a lower sleeve 112, the diameter of the upper sleeve 111 being smaller than the diameter of the lower sleeve 112. In this embodiment, the fluid inlet 102 is disposed on the circumferential wall of the upper sleeve 111.

[0024] The replenishing valve 100 also includes a generally cylindrical fixed iron core 121 and a movable iron core 122, both disposed within the upper housing 101. The fixed iron core 121 is fixedly connected to the upper housing 101, for example, by laser welding. The movable iron core 122 is movably disposed below the fixed iron core 121. In this embodiment, the center of the top of the movable iron core 122 has a spring cavity 113, within which a first spring 131 is disposed. The first spring 131 engages the fixed iron core 121 and the movable iron core 122. The top of the first spring 131 abuts against the bottom end of the fixed iron core 121, and the bottom of the first spring 131 is connected to the bottom of the spring cavity 113 of the movable iron core 122. The first spring 131 is capable of axial deformation. Figure 1D In the state shown, the first spring 131 is in a pre-compressed state to apply a downward preload to the moving iron core 122. In such a state... Figure 2 and Figure 3 In the indicated state, the first spring 131 is fully compressed, applying a downward elastic force to the moving iron core 122. The replenishing valve 100 also includes a switching element that engages with the primary valve seat 120 to open or close the opening 246 on the primary valve seat 120 (see [link]). Figure 2(As shown). In this embodiment, the switching element includes a steel ball 132. The steel ball 132 is fixedly connected to the center of the bottom of the moving iron core 122 and protrudes from the bottom end face of the moving iron core 122. Under the preload of the first spring 131, the steel ball 132 can firmly abut against the opening 246 on the first-stage valve seat 120, thereby closing the opening 246.

[0025] The replenishing valve 100 also includes a primary valve seat 120 and a secondary valve seat 130. The primary valve seat 120 is disposed within the lower housing 110 and located below the moving iron core 122. The primary valve seat 120 is generally cylindrical in shape, with an axially extending fluid passage 128 in its middle portion, and an opening 246 formed at the top of the fluid passage 128 (see...). Figure 2 As shown, opening 246 communicates with fluid inlet 102, and the bottom end of fluid channel 128 communicates with fluid outlet 103. As the moving iron core 122 moves up and down, opening 246 engages with steel ball 132, allowing opening 246 to be opened or closed by steel ball 132. When the primary valve seat 120 is open, opening 246 is opened by steel ball 132, allowing fluid channel 128 to connect fluid inlet 102 and fluid outlet 103. When the primary valve seat 120 is closed, opening 246 is closed by steel ball 132, allowing fluid channel 128 to disconnect fluid inlet 102 and fluid outlet 103. The top of the primary valve seat 120 has a radially outwardly projecting annular flange 129, and the outer wall of the bottom of the primary valve seat 120 has an outer sealing surface 125. The outer sealing surface 125 is disposed on the circumferential wall of the primary valve seat 120 and has an inclined shape surrounding the bottom edge of the primary valve seat 120. In this embodiment, the outer sealing surface 125 extends obliquely from the outside to the inside in the axial direction from top to bottom.

[0026] A secondary valve seat 130 is disposed at the connection between the upper sleeve 111 and the lower sleeve 112. In this embodiment, the secondary valve seat 130 includes a shoulder 141 protruding inward from the inner wall of the lower housing 110, and the shoulder 141 is integrally formed with the lower housing 110. The top of the shoulder 141 has an inner sealing surface 145, which has an inclined shape surrounding the top edge of the shoulder 141. The shape of the inner sealing surface 145 matches the shape of the outer sealing surface 125 so that the inner sealing surface 145 can contact and engage with the outer sealing surface 125. In this embodiment, the inner sealing surface 145 extends obliquely from the outside to the inside in the axial direction from top to bottom. An annular channel 348 (see [link to documentation]) is also provided between the inner sealing surface 145 of the secondary valve seat 130 and the outer sealing surface 125 of the primary valve seat 120. Figure 3(As shown). The annular channel 348 provides fluid communication between the fluid inlet 102 and the fluid outlet 103. When the secondary valve seat 130 is open, the outer sealing surface 125 moves away from the inner sealing surface 145, allowing the annular channel 348 to connect the fluid inlet 102 and the fluid outlet 103. When the secondary valve seat 130 is closed, the outer sealing surface 125 engages with the inner sealing surface 145, allowing the annular channel 348 to disconnect the fluid inlet 102 and the fluid outlet 103.

[0027] In this application, the minimum axial height of the shoulder 141 is greater than the radial wall thickness of either the upper sleeve 111 or the lower sleeve 112 of the lower housing 110. This arrangement provides the shoulder 141 with better strength. When the secondary valve seat 130 is opened, the shoulder 141 is less prone to deformation even if the fluid pressure flowing through it is too high. In this embodiment, the bottom end of the upper sleeve 111 is folded inward radially to form an upper sleeve folded edge 161, and the top end of the lower sleeve 112 is also folded inward radially to form a lower sleeve folded edge 162. The folding length of the upper sleeve folded edge 161 is greater than the folding length of the lower sleeve folded edge 162. The shoulder 141 is formed by the overlap of the upper sleeve folded edge 161 and the lower sleeve folded edge 162. Furthermore, the inner sealing surface 145 is provided on the inner wall of the upper sleeve folded edge 161. This ensures that the maximum axial height of the shoulder 141 is approximately the sum of the wall thicknesses of the upper sleeve 111 and the lower sleeve 112, thus giving the shoulder 141 good strength. As an example, the secondary valve seat 130 is integrally formed with the lower housing 110 through a deep drawing process. That is, the upper sleeve 111, the lower sleeve 112, and the secondary valve seat 130 are manufactured through a deep drawing process. In some embodiments, those skilled in the art can also perform metal extrusion and shaping operations on the lower sleeve 112 according to actual needs to form the shoulder 141 and the inner sealing surface 145 of the required shape.

[0028] The replenishing valve 100 also includes a guide sleeve 135, which is a circular sleeve shape. It surrounds the primary valve seat 120 and is disposed between the primary valve seat 120 and the upper sleeve 111, and is radially spaced from both the primary valve seat 120 and the upper sleeve 111 to form a space for fluid flow. The top end of the guide sleeve 135 is fixedly connected to the moving iron core 122, and the bottom end of the guide sleeve 135 extends inward to form a flange 139. A second spring 138 is sleeved on the outside of the primary valve seat 120 and supported between the flange 139 of the guide sleeve 135 and the flange 129 of the primary valve seat 120. The second spring 138 is also capable of axial deformation. In this embodiment, the circumferential wall of the guide sleeve 135 is provided with at least one through hole 136 for fluid flow.

[0029] In such Figure 1A-1DIn the indicated state, the replenishing valve 100 is closed. The moving iron core 122 is spaced a certain distance from the fixed iron core 121. The steel ball 132 abuts against the first-stage valve seat 120 and closes the opening 246 of the fluid passage 128 (see...). Figure 2 (as shown), so that the fluid passage 128 is disconnected. And the inner sealing surface 145 of the secondary valve seat 130 abuts against the outer sealing surface 125 of the primary valve seat 120, such that the annular passage 348 between the outer sealing surface 125 and the inner sealing surface 145 (see...) Figure 3 The fluid inlet 102 and fluid outlet 103 are also closed. Therefore, the fluid inlet 102 and fluid outlet 103 are disconnected, preventing fluid from flowing through the replenishing valve 100.

[0030] When the coil outside the upper housing 101 is energized, the fixed iron core 121 attracts the moving iron core 122, causing the moving iron core 122 to move axially upwards towards the fixed iron core 121 against the elastic force of the first spring 131, further compressing the first spring 131 until it reaches the desired position. Figure 2 The location shown.

[0031] Figure 2 This shows the state when the replenishing valve 100 is in the first-stage valve seat 120 is open. For example... Figure 2 As shown, when the primary valve seat 120 is opened, the moving iron core 122 moves upward, creating an upper cavity 247 between the moving iron core 122, the guide sleeve 135, and the primary valve seat 120. The upward movement of the moving iron core 122 allows the steel ball 132 to leave the opening 246 of the fluid channel 128, thus opening the opening 246 and connecting the fluid inlet 102 and the fluid outlet 103 through the fluid channel 128. The guide sleeve 135 moves upward along with the movement of the moving iron core 122. The flange 139 at the bottom of the guide sleeve 135 moves upward, compressing the second spring 138. At this time, the first spring 131 applies a downward force to the moving iron core 122, and the second spring 138 applies an upward force to the primary valve seat 120.

[0032] The fluid pressure at fluid inlet 102 is greater than the fluid pressure at fluid outlet 103, allowing pressurized fluid to flow from fluid inlet 102 to fluid outlet 103. Furthermore, the pressure difference between fluid inlet 102 and fluid outlet 103 causes a downward pressure from the pressurized fluid on the first-stage valve seat 120, thereby holding the first-stage valve seat 120 in place. Figure 2 The pressure fluid entering the replenishing valve 100 from the fluid inlet 102 passes through the through hole 136 on the guide sleeve 135 into the upper cavity 247, then through the opening 246 of the fluid channel 128 into the fluid channel 128, and finally exits from the replenishing valve 100 from the fluid outlet 103.

[0033] As the pressurized fluid flows, the pressure difference between the fluid inlet 102 and the fluid outlet 103 gradually decreases. Until the restoring force of the second spring 138 exceeds the pressure difference, the second spring 138 pushes the first-stage valve seat 120 upwards until the first-stage valve seat 120 reaches a certain position. Figure 3 As shown, the secondary valve seat 130 is open.

[0034] Figure 3 This shows the state of the replenishment valve 100 when the secondary valve seat is open. For example... Figure 3 As shown, the steel ball 132 at the bottom of the moving iron core 122 again abuts against the opening 246 of the primary valve seat 120, thereby closing the opening 246 and disconnecting the fluid passage 128, thus closing the primary valve seat 120. Furthermore, as the primary valve seat 120 moves upward, the outer sealing surface 125 of the primary valve seat 120 moves away from the inner sealing surface 145 of the secondary valve seat 130, and the fluid inlet 102 and fluid outlet 103 are connected through the annular channel 348 between the outer sealing surface 125 and the inner sealing surface 145. The pressurized fluid entering the replenishing valve 100 from the fluid inlet 102 is directly discharged from the replenishing valve 100 through the annular channel 348. The flow area of ​​the annular channel 348 is larger than the flow area of ​​the opening 246, and the flow path is shorter; therefore, when the secondary valve seat 130 is open, the flow rate of the pressurized fluid flowing out of the fluid outlet 103 is greater.

[0035] When the coil outside the upper housing 101 is de-energized, the fixed iron core 121 no longer attracts the moving iron core 122. The first spring 131 pushes the moving iron core 122 and the first-stage valve seat 120 downwards until the second-stage valve seat 130 is closed, reaching the desired position. Figure 1A-1D The screen is closed as shown.

[0036] In this embodiment, the upper housing 101 and the lower housing 110 are fixed. The fixed iron core 121 is fixedly connected inside the upper housing 101 and is therefore also fixed. The secondary valve seat 130 is integrally formed with the lower housing 110 and is therefore also fixed. The moving iron core 122 and the guide sleeve 135 are fixedly connected and move up and down synchronously relative to the fixed iron core 121. The primary valve seat 120 and the guide sleeve 135 are connected by a second spring 138. Therefore, under the elastic force of the second spring 138, the primary valve seat 120 can move relative to the guide sleeve 135 to open the primary valve seat 120 and close the secondary valve seat 130, or it can move together with the guide sleeve 135 to close the primary valve seat 120 and open the secondary valve seat 130. By setting the parameters of the second spring 138, such as the elastic coefficient and length, the opening and closing conditions of the primary valve seat 120 and the secondary valve seat 130 can be controlled.

[0037] In various embodiments of this application, the components of the replenishment valve are made of metal, such as ferromagnetic materials.

[0038] In some applications of the replenishing valve, there may be a significant pressure difference between the fluid inlet 102 and the fluid outlet 103. Under the action of pressurized fluid, directly opening the secondary valve seat requires overcoming a large pressure. In the replenishing valve of this application, by controlling the opening of either the primary or secondary valve seat, the fluid is discharged through flow channels with different flow areas, thereby controlling the two-stage opening of the replenishing valve. This allows the pressurized fluid to gradually increase, and the pressure difference between the fluid inlet 102 and the fluid outlet 103 stably reaches the expected value.

[0039] The lower housing and secondary valve seat of the replenishing valve in this application are integrally formed, avoiding manufacturing errors and assembly tolerances associated with separately manufacturing the lower housing and secondary valve seat, thus saving procurement and assembly costs. Furthermore, the secondary valve seat of this application is formed using a metal folding process, which ensures good sealing performance while also providing good strength.

[0040] Furthermore, the valve seat of this application can be manufactured by deep drawing process, which is simpler than other metal processing processes, eliminating the need for complex mold design and saving manufacturing costs.

[0041] Although this application has been described with reference to examples of embodiments outlined above, various alternatives, modifications, variations, improvements, and / or substantially equivalents, whether known or currently or soon to be foreseen, will likely be apparent to those skilled in the art. Furthermore, the technical effects and / or technical problems described herein are exemplary and not limiting. Therefore, the disclosures in this specification may be used to solve other technical problems and achieve other technical effects. Thus, the examples of embodiments of this application as set forth above are intended to be illustrative and not limiting. Various changes can be made without departing from the spirit or scope of this application. Therefore, this application is intended to include all known or previously developed alternatives, modifications, variations, improvements, and / or substantially equivalents.

Claims

1. A replenishing valve, characterized in that... include: The lower housing (110) includes an upper sleeve (111) and a lower sleeve (112) connected to each other, the upper sleeve (111) and the lower sleeve (112) extending along a common axial direction; A primary valve seat (120) is disposed within the lower housing (110) and is configured to move along the axial direction, the outer wall of the primary valve seat (120) having an outer sealing surface (125); as well as A secondary valve seat (130) is disposed at the connection between the upper sleeve (111) and the lower sleeve (112). The secondary valve seat (130) includes a shoulder (141) protruding inward from the inner wall of the lower housing (110). The top of the shoulder (141) has an inner sealing surface (145), which can contact and cooperate with the outer sealing surface (125). The shoulder (141) of the secondary valve seat (130) is integrally formed on the inner wall of the lower housing (110), and the minimum height of the shoulder (141) along the axial direction is greater than the radial wall thickness of either the upper sleeve (111) or the lower sleeve (112) of the lower housing (110).

2. The replenishing valve according to claim 1, characterized in that: The bottom end of the upper sleeve (111) is folded inward to form an upper sleeve folded edge (161), and the top end of the lower sleeve (112) is folded inward to form a lower sleeve folded edge (162). The shoulder (141) is formed by the overlap of the upper sleeve folded edge (161) and the lower sleeve folded edge (162). The inner sealing surface (145) is disposed on the inner wall of the upper sleeve folded edge (161).

3. The replenishing valve according to claim 2, characterized in that: The diameter of the lower sleeve (112) is smaller than the diameter of the upper sleeve (111).

4. The replenishing valve according to claim 2, characterized in that: The secondary valve seat (130) is integrally formed with the lower housing (110) by a deep drawing process.

5. The replenishing valve according to claim 1, characterized in that: The outer sealing surface (125) is located on the circumferential wall at the bottom of the first-stage valve seat (120), and the outer sealing surface (125) extends obliquely from the outside to the inside in the axial direction from top to bottom; and The inner sealing surface (145) is located on the circumferential wall at the top of the shoulder (141), and the inner sealing surface (145) extends obliquely from the outside to the inside in the axial direction from top to bottom.

6. The replenishing valve according to claim 5, characterized in that: The maximum height of the shoulder (141) along the axial direction is the sum of the radial wall thicknesses of the upper sleeve (111) and the lower sleeve (112) of the lower housing (110).

7. The replenishing valve according to claim 1, characterized in that: The primary valve seat (120) has a fluid passage (128); The replenishing valve (100) has a fluid inlet (102) and a fluid outlet (103); The primary valve seat (120) is configured to be open or closed. When the primary valve seat (120) is open, the fluid passage (128) is connected to fluidly connect the fluid inlet (102) and the fluid outlet (103). When the primary valve seat (120) is closed, the fluid passage (128) is disconnected to disconnect the fluid inlet (102) and the fluid outlet (103).

8. The replenishing valve according to claim 7, characterized in that: An annular channel (348) is provided between the outer sealing surface (125) of the primary valve seat (120) and the inner sealing surface (145) of the secondary valve seat (130); The secondary valve seat (130) is configured to open or close. When the secondary valve seat (130) is open, the outer sealing surface (125) moves away from the inner sealing surface (145), allowing the annular channel (348) to connect the fluid inlet (102) and the fluid outlet (103). When the secondary valve seat (130) is closed, the outer sealing surface (125) contacts and engages with the inner sealing surface (145), allowing the annular channel (348) to disconnect the fluid inlet (102) and the fluid outlet (103).

9. The replenishing valve according to claim 8, characterized in that: The replenishing valve (100) also includes: A fixed iron core (121) and a movable iron core (122) are provided, wherein the movable iron core (122) is disposed between the fixed iron core (121) and the first-stage valve seat (120), and wherein the movable iron core (122) is capable of moving axially relative to the fixed iron core (121) to approach or move away from the first-stage valve seat (120); A first spring (131) extends axially and is elastically connected between the fixed iron core (121) and the moving iron core (122) to provide an axial elastic force to the moving iron core (122); and A switching element, the switching element being connected to the moving iron core (122); The fixed iron core (121) and the moving iron core (122) are configured such that, as the moving iron core (122) moves, the switching element can connect or disconnect the fluid channel (128) to open or close the first-stage valve seat (120).

10. The replenishing valve according to claim 9, characterized in that: The replenishing valve (100) also includes a guide sleeve (135), which is fixedly connected to the moving iron core (122) so as to move with the movement of the moving iron core (122). The guide sleeve (135) is disposed between the first-stage valve seat (120) and the lower housing (110). The guide sleeve (135) includes a through hole (136), and the fluid channel (128) is in fluid communication with the fluid inlet (102) through the through hole (136). The replenishing valve (100) also includes a second spring (138) that extends axially and is elastically connected between the primary valve seat (120) and the guide sleeve (135) to provide an axial elastic force to the primary valve seat (120). The secondary valve seat (130) is configured to open or close based on the pressure difference between the fluid inlet (102) and the fluid outlet (103) and the elastic force of the second spring (138).

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