Rigidity valve

Abstract

The utility model discloses a rigidity valve, which is used in the technical field of automobile air suspension systems, and structurally comprises a valve body and a valve seat connected on the valve body, the valve body comprises a valve core and an electromagnetic driving mechanism for driving the valve core to move axially, the valve seat is provided with a valve cavity and a valve port, the valve core is in clearance fit in the valve cavity, and the valve core is in clearance fit with the valve port. The valve body is used for opening or closing the valve port; the rigidity valve further comprises a diaphragm made of flexible materials, the diaphragm is fixedly connected to the valve element and connected with the valve element in a sealed mode, and the outer edge of the diaphragm is connected with the valve cavity in a sealed mode and used for preventing media in the valve cavity from entering the side, away from the valve port, of the diaphragm. The rigidity valve is good in sealing performance, long in service life and low in energy consumption, and the reliability requirement for closing or opening the valve port of the valve element can be met.

Description

Technical Field

[0001] The present application relates to the technical field of control valves for automobile air suspension systems, and in particular to a stiffness valve for air suspension systems. Background Art

[0002] Automobile air suspension is a device that controls the vehicle's suspension height through air pressure. In the automobile air suspension system, the air suspension control solenoid valve is an important component. Its main function is to control inflation or deflation according to different road conditions and adjust the stiffness of the air spring. Therefore, the solenoid valve is also called the stiffness valve.

[0003] The stiffness valve of the air suspension system of the related art has a structure including a valve body, an electromagnetic drive part, a valve core and a valve stem. One end of the valve stem is connected to the armature of the electromagnetic drive part and can move synchronously with the armature. The other end of the valve stem is connected to the valve core. Through the axial movement of the valve stem, the valve core can be driven to approach or move away from the valve port of the valve body, thereby closing or opening the valve port. Since the internal air pressure of the automobile air suspension system generates instantaneous high pressure and pressure fluctuations during the movement of the automobile, this requires the sealing member of the sealing valve core to have sufficient sealing performance to improve the reliability of the valve core closing or opening the valve port. Therefore, in order to ensure the sealing performance of the valve core, the stiffness valve of the related art has a relatively large pressure between its sealing member and the valve core, which will cause wear to the sealing member during the axial movement of the valve core, thereby affecting its sealing performance and shortening its service life; in addition, if the sealing member of the sealing valve core applies too much pressure to the valve core, the electromagnetic drive part needs to provide a large driving force, which will inevitably lead to increased energy consumption. Utility Model Content

[0004] The technical problem to be solved by the present application is to overcome the defects of the above-mentioned related technologies and provide a rigid valve with good sealing performance, long service life, reliability requirements of lifting the valve core to close or open the valve port, and low energy consumption.

[0005] The technical solution of the present application is to provide a rigidity valve with the following structure: comprising a valve body and a valve seat connected to the valve body, the valve body comprising a valve core and an electromagnetic drive mechanism for driving the valve core to move axially, the valve seat having a valve cavity and a valve port, the valve core gap being fitted in the valve cavity for opening or closing the valve port; the rigidity valve also comprises a diaphragm made of a flexible material, the diaphragm being fixedly connected to the valve core and sealingly connected to the valve core, the outer edge of the diaphragm being sealingly connected to the valve cavity for blocking the medium in the valve cavity from entering the side of the diaphragm away from the valve port.

[0006] In some embodiments, the valve core is provided with an annular mounting groove along the circumference, and the center of the diaphragm is provided with a mounting hole, and the mounting hole is tightly fitted in the annular mounting groove.

[0007] In some embodiments, a deformation portion extending axially into the valve cavity is formed in the middle of the diaphragm, or when the mounting hole of the diaphragm is installed in the annular mounting groove of the valve core, a deformation portion extending axially into the valve cavity is formed in the middle of the diaphragm.

[0008] In some embodiments, at least a portion of the cross-section of the deformation portion is wavy, arc-shaped, or S-shaped.

[0009] In some embodiments, an outer edge of the diaphragm is sealingly connected between the valve body and the valve seat.

[0010] In some embodiments, the valve core includes an upper valve core and a lower valve core that are coaxially arranged, the upper valve core and the lower valve core are tightly fitted, and the annular mounting groove is provided between the upper valve core and the lower valve core.

[0011] In some embodiments, the valve body includes a valve housing, in which a valve stem, a stop iron and the electromagnetic drive mechanism are connected, the electromagnetic drive mechanism includes an excitation coil and an axially movable armature, the stop iron has a center hole, the valve stem is clearance-fitted in the center hole, one end of the valve stem is connected to the armature, and the other end of the valve stem is connected to the valve core; one end of the valve housing close to the electromagnetic drive mechanism is connected to an electrical connection seat electrically connected to the electromagnetic drive mechanism, and one end of the valve housing close to the stop iron is connected to the valve seat.

[0012] In some embodiments, a receiving cavity coaxial with the center hole is provided on the end surface of the stop iron near the valve seat, and the valve core is at least partially received in the receiving cavity; a shock-absorbing seat convex axially outward is connected to the end of the valve core near the stop iron, and a sealing body that seals against the valve port is connected to the free end surface of the valve core.

[0013] In some embodiments, a first mounting hole coaxial with the center hole is provided on the end surface of the stop iron near the armature, and a second mounting hole coaxial with the center hole is provided on the end surface of the armature near the stop iron, an elastic member is provided between the armature and the stop iron, and one end of the elastic member is connected to the first mounting hole and the other end of the elastic member is connected to the second mounting hole.

[0014] In some embodiments, a first annular groove is provided on the outer wall of the stop iron, and a first sealing ring sealed with the inner wall of the valve housing is connected to the first annular groove; the end of the valve housing away from the valve seat is radially contracted to form a second annular groove, and a second sealing ring is connected to the second annular groove.

[0015] In summary, compared with the related art, the rigidity valve of the present application has the following advantages: the rigidity valve has a diaphragm made of a flexible material sealed on the valve core, and the outer edge of the diaphragm is sealed and connected to the valve cavity, so the diaphragm blocks the airflow medium in the valve cavity from entering the side of the diaphragm away from the valve port. That is, the diaphragm plays a role in closing the gap between the outer wall of the valve core and the valve cavity. When the valve core moves axially to adjust the valve port opening, the diaphragm moves synchronously with the valve core and prevents the airflow from entering the valve body through the gap between the outer wall of the valve core and the valve cavity, and has good sealing performance; in addition, because the diaphragm is fixedly connected to the valve core and sealed to the valve core, when the valve core moves axially, there is no relative displacement between the valve core and the diaphragm, which effectively avoids the defect of the diaphragm being worn due to friction when the valve core moves, further improves the sealing performance between the diaphragm and the valve core, and is not easy to wear the diaphragm. Therefore, the rigid valve has good sealing performance and long service life, and can meet the reliability requirements of lifting the valve core to close or open the valve port; furthermore, due to the flexibility of the diaphragm, when the valve core moves axially, the diaphragm swings with the valve core, and the flexibility of the diaphragm exerts less resistance to the axial movement of the valve core, thereby reducing the driving force of the electromagnetic drive mechanism and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a stiffness valve according to some embodiments of the present application.

[0017] Figure 2 It is a schematic diagram of the assembly structure of a stiffness valve according to some embodiments of the present application.

[0018] Figure 3 is a cross-sectional view of a stiffness valve according to some embodiments of the present application.

[0019] Figure 4 It is a stereoscopic diagram of the cross-sectional structure of a stiffness valve according to some embodiments of the present application.

[0020] Description of reference numerals:

[0021] 1. Valve body, 100. Valve shell, 101. Second annular groove, 102. Second sealing ring, 2. Valve seat, 200. First air hole, 201. Second air hole, 202. Valve port, 203. Third sealing ring, 204. Third annular groove, 3. Electrical connection seat, 4. Electromagnetic drive mechanism, 400. Excitation coil, 401. Armature, 402. Valve stem, 403. Second mounting hole, 404. Elastic member, 5. Stop iron, 500. Center hole, 501. Accommodating chamber, 502. First annular groove, 503. First sealing ring, 504. First mounting hole, 6. Valve core, 600. Upper valve core, 601. Lower valve core, 602. Annular mounting groove, 603. Shock-absorbing seat, 604. Sealing body, 7. Diaphragm, 700. Gasket. DETAILED DESCRIPTION

[0022] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0023] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0024] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] See also Figure 1 to Figure 4As shown; the embodiment of the present application discloses a stiffness valve, which is used for an air pressure control valve of an automobile air suspension system, and its structure includes a valve body 1 and a valve seat 2 connected to the valve body 1, the valve body 1 includes a valve core 6 and an electromagnetic drive mechanism 4 for driving the valve core 6 to move axially, the valve seat 2 has a valve cavity and a valve port 202, and the valve core 6 is gap-fitted in the valve cavity for opening or closing the valve port 202; specifically in this embodiment, the valve body 1 also includes a valve housing 100, and a valve stem 402, a stop iron 5 and an electromagnetic drive mechanism 4 are connected to the valve housing 100, and the electromagnetic drive mechanism 4 includes an excitation coil 400 and an axially movable armature 401, the stop iron 5 is fixedly connected between the electromagnetic drive mechanism 4 and the valve seat 2, the stop iron 5 has a center hole 500, and the valve stem 402 has a gap. Fitted in the center hole 500, one end of the valve stem 402 is connected to the armature 401, and the other end of the valve stem 402 is connected to the valve core; the end of the valve housing 100 close to the electromagnetic drive mechanism 4 is connected to the electrical connection seat 3 electrically connected to the electromagnetic drive mechanism 4, and the end of the valve housing 100 close to the stop iron 5 is connected to the valve seat 2; the valve seat 2 has a first air hole 200, a plurality of second air holes 201 arranged on the side wall of the valve seat 2, and a valve port 202 connecting the first air hole 200 and the second air hole 201; the electrical connection seat 3 is electrically connected to the excitation coil 400 of the electromagnetic drive mechanism 4, and the excitation coil 400 is energized to generate electromagnetic force to drive the armature 401 to move axially, and the armature 401 drives the valve core 6 to move through the valve stem 402 to adjust the opening of the valve port 202. The first air hole 200 and the second air hole 201 of the stiffness valve of the embodiment of the present application are respectively connected to an air spring chamber of the automobile air suspension system. When the air spring needs to be closed to maintain or stabilize the air pressure, the electromagnetic drive mechanism 4 drives the valve core 6 to close the valve port 202 ; when the air spring air pressure drops significantly and needs to be supplemented, the electromagnetic drive mechanism 4 drives the valve core 6 to open the valve port 202 .

[0027] In this embodiment, the first air hole 200 and the second air hole 201 both have air inlet and outlet to each other, such as the first air hole 200 for air inlet and the second air hole 201 for air outlet; or the first air hole 200 for air outlet and the second air hole 201 for air inlet.

[0028] In the embodiments of the present application, Figure 1 and Figure 2 As shown, the electrical connection seat 3 has an electrical plug connector, and the plugging direction of the electrical plug connector is parallel to or coincides with the axis of the valve housing 100. This arrangement can prevent the electrical connection seat 3 from radially protruding from the outer circumferential wall of the valve housing 100, thereby making the solenoid valve small in size and compact in structure.

[0029] In this embodiment, if Figure 3 and Figure 4As shown, a receiving cavity 501 coaxial with the center hole 500 is provided on the end surface of the stop iron 5 close to the valve seat 2, and the receiving cavity 501 is cylindrical, and its inner diameter is adapted to the outer diameter of the valve core; the valve core 6 is at least partially received in the receiving cavity 501; that is, when the valve core 6 moves axially, a part of the valve core 6 is always in the receiving cavity 501; in the embodiment of the present application, a damping seat 603 convex outwardly along the axial direction is connected to the end of the valve core 6 close to the stop iron 5, and a sealing body 604 that is sealed against the valve port 202 is connected to the free end surface of the valve core 6. When the valve core 6 opens the valve port 202, the damping seat 603 of the valve core 6 is against the bottom of the receiving cavity 501 of the stop iron 5, and when the valve core closes the valve port 202, the sealing body 604 on the free end surface of the valve core 6 is against the valve port 202 and sealed.

[0030] It is not difficult to understand that, in this embodiment, if Figure 1 , Figure 2 and Figure 3 As shown, in order to improve the sealing performance inside the rigid valve, a first annular groove 502 is provided on the outer wall of the stop iron 5, and a first sealing ring 503 is connected to the inner wall of the valve housing 100. In order to improve the sealing performance and stability of the solenoid valve installation, a second annular groove 101 is formed by radially shrinking at one end of the valve housing 100 away from the valve seat 2, and a second sealing ring 102 is connected to the second annular groove 101. A third annular groove 204 is provided on the outer peripheral wall of the valve seat 2, and a third sealing ring 203 is connected to the third annular groove 204.

[0031] like Figure 3 and Figure 4 As shown, in this embodiment, a first mounting hole 504 coaxial with the center hole 500 is provided on the end surface of the stopper 5 close to the armature 401, and a second mounting hole 403 coaxial with the center hole 500 is provided on the end surface of the armature 401 close to the stopper 5, and an elastic member 404 is provided between the armature 401 and the stopper 5, and one end of the elastic member 404 is connected to the first mounting hole 504 and the other end of the elastic member 404 is connected to the second mounting hole 403. The elastic member 404 is a spring, and when the electromagnetic drive mechanism 4 drives the valve core 6 to close the valve port 202, the elastic member 404 is compressed, and when the electromagnetic drive mechanism 4 loses power, the elastic member 404 is reset and drives the armature 401 to reset, so that the valve core 6 quickly opens the valve port 202.

[0032] In this embodiment, if Figure 2 , Figure 3 and Figure 4As shown, the rigidity valve further includes a diaphragm 7 made of a flexible material, which is fixedly connected to the valve core 6 and sealed with the valve core 6, and the outer edge of the diaphragm 7 is sealed with the valve cavity, and is used to prevent the medium in the valve cavity from entering the side of the diaphragm 7 away from the valve port 202. That is, the diaphragm 7 plays a role in closing the gap between the outer wall of the valve core 6 and the valve cavity. When the valve core 6 moves axially to adjust the opening of the valve port 202, the diaphragm 7 moves synchronously with the valve core 6, and prevents the air flow from entering the valve body 1 through the gap between the outer wall of the valve core 6 and the valve cavity, and has good sealing performance; in addition, because the diaphragm 7 is fixedly connected to the valve core 6 and sealed with the valve core 6, when the valve core 6 moves axially, there is no relative displacement between the valve core and the diaphragm 7, which effectively avoids the defect of the diaphragm 7 being worn due to friction when the valve core 6 moves, further improves the sealing performance between the diaphragm 7 and the valve core 6, and is not easy to wear the diaphragm 7. Therefore, the rigid valve has good sealing performance and long service life, and can meet the reliability requirements of lifting the valve core 6 to close or open the valve port 202; furthermore, due to the flexibility of the diaphragm 7, when the valve core moves axially, the diaphragm 7 swings with the valve core 6, and the flexibility of the diaphragm 7 exerts less resistance to the axial movement of the valve core 6, thereby reducing the driving force of the electromagnetic drive mechanism 4 and reducing energy consumption.

[0033] In this embodiment, the diaphragm 7 is made of a flexible material, such as soft rubber or silicone, which is soft and has good deformation ability and elasticity. Figure 2 , Figure 3 and Figure 4 As shown, the valve core 6 is provided with an annular mounting groove 602 along the circumferential direction, and the diaphragm 7 is provided with a mounting hole at the center, and the mounting hole is tightly fitted in the annular mounting groove 602. Specifically, the inner diameter of the annular mounting groove 602 is larger than the size of the mounting hole at the center of the diaphragm 7. When the mounting hole of the diaphragm 7 is sleeved in the annular mounting groove 602, the mounting hole of the diaphragm 7 is tightly fitted with the valve core, and the diaphragm 7 and the valve core are sealed and connected.

[0034] In the embodiment of the present application, a deformation portion (not shown in the figure) is formed in the middle of the diaphragm 7 and extends axially into the valve cavity. Because the diaphragm 7 is made of flexible material, when the valve core 6 is driven to move axially, the deformation portion floats back and forth along the axial direction of the valve core 6. The deformation portion effectively prevents the diaphragm 7 from exerting resistance on the valve core, thereby reducing the energy consumption of the electromagnetic drive mechanism 4; in addition, the deformation portion can also avoid pulling on the edge connection of the diaphragm 7 when the valve core 6 moves axially, thereby making the connection of the diaphragm 7 more firm, stable, and sealed.

[0035] In the rigid valve of this embodiment, when the valve core 6 is in the open state, the diaphragm 7 is in the natural state, such as Figure 3 When the valve core 6 closes the valve port 202, the valve core 6 applies a force to the diaphragm 7, causing the diaphragm 7 to deform.

[0036] Further, in this embodiment, when the mounting hole of the diaphragm 7 is installed in the annular mounting groove 602 of the valve core 6, the diaphragm 7 is subjected to the radial pressure of the valve core 6, so that a deformation portion extending axially into the valve cavity is formed in the middle of the diaphragm 7. That is, the inner diameter of the annular mounting groove 602 of the valve core 6 is larger than the size of the mounting hole at the center of the diaphragm 7. When the mounting hole of the diaphragm 7 is installed in the annular mounting groove 602 of the valve core 6, the diaphragm 7 is squeezed and deformed in the radial direction, so that a deformation portion extending axially into the valve cavity is formed in the middle of the diaphragm 7.

[0037] In other embodiments, the deformation portion in the middle of the diaphragm 7 can also be formed as a deformation portion extending axially into the valve cavity during the preparation process of the diaphragm 7; or the deformation portion is also the planar diaphragm 7 itself. The diaphragm 7 is planar under normal conditions and deforms axially along with the valve core 6 when the valve core 6 moves axially.

[0038] In this embodiment, at least a portion of the cross section of the deformation portion is in one of a wave shape, an arc shape, and an S shape.

[0039] For example, after the diaphragm 7 is installed on the valve core, an arc-shaped protrusion protruding in the axial direction is formed in the middle of the diaphragm 7 due to the squeezing force of the valve core 6 on the diaphragm 7 .

[0040] Further in the embodiments of the present application, Figure 2 and Figure 3 As shown, the valve core 6 includes an upper valve core 600 and a lower valve core 601 which are coaxially arranged. The upper valve core 600 and the lower valve core 601 are tightly matched and an annular mounting groove 602 is provided between the upper valve core 600 and the lower valve core 601. After the upper valve core 600 and the lower valve core 601 are tightly matched, an annular mounting groove 602 is formed between the two.

[0041] In this embodiment, the outer edge of the diaphragm 7 is sealed and connected to the valve cavity. Specifically, in this embodiment, the outer edge of the diaphragm 7 is sealed and connected between the valve body 1 and the valve seat 2, that is, a step surface is provided at the bottom of the stop iron 5 of the valve body 1, and the inner end of the valve seat 2 is crimped to the step surface through a gasket 700. The outer edge of the diaphragm 7 is located between the step surface and the gasket 700. After the valve seat 2 is connected to the valve body 1, the gasket 700 tightly seals and crimps the outer edge of the diaphragm 7 to the step surface.

[0042] In other embodiments, the outer edge of the diaphragm 7 may also be sealed and connected to the inner wall of the valve cavity of the valve seat 2 , or sealed and connected to the stopper 5 of the valve body 1 .

[0043] In some embodiments, in order to improve the connection firmness of the outer edge of the diaphragm 7, a flange or annular rib may be provided on the outer edge of the diaphragm 7.

[0044] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0045] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A rigidity valve, comprising a valve body and a valve seat connected to the valve body, wherein the valve body comprises a valve core and an electromagnetic driving mechanism for driving the valve core to move axially, the valve seat has a valve cavity and a valve port, the valve core is gap-fitted in the valve cavity for opening or closing the valve port; characterized in that: The rigidity valve also includes a diaphragm made of flexible material, which is fixedly connected to the valve core and sealed to the valve core. The outer edge of the diaphragm is sealed to the valve cavity to prevent the medium in the valve cavity from entering the side of the diaphragm away from the valve port.

2. The stiffness valve according to claim 1, characterized in that: The valve core is provided with an annular mounting groove along the circumferential direction, and the center of the diaphragm is provided with a mounting hole, and the mounting hole is tightly fitted in the annular mounting groove.

3. The stiffness valve according to claim 2, characterized in that: A deformation portion extending axially into the valve cavity is formed in the middle of the diaphragm, or when the mounting hole of the diaphragm is installed in the annular mounting groove of the valve core, the diaphragm is subjected to radial pressure from the valve core so that a deformation portion extending axially into the valve cavity is formed in the middle of the diaphragm.

4. The stiffness valve according to claim 3, characterized in that: At least a portion of the cross section of the deformation portion is in one of a wave shape, an arc shape, and an S shape.

5. The stiffness valve according to claim 1, characterized in that: The outer edge of the diaphragm is sealed and connected between the valve body and the valve seat.

6. The stiffness valve according to claim 2, characterized in that: The valve core comprises an upper valve core and a lower valve core which are coaxially arranged. The upper valve core and the lower valve core are tightly matched and the annular mounting groove is arranged between the upper valve core and the lower valve core.

7. The stiffness valve according to claim 1, characterized in that: The valve body includes a valve housing, in which a valve stem, a stop iron and the electromagnetic drive mechanism are connected, the electromagnetic drive mechanism includes an excitation coil and an axially movable armature, the stop iron has a center hole, the valve stem is clearance-fitted in the center hole, one end of the valve stem is connected to the armature, and the other end of the valve stem is connected to the valve core; one end of the valve housing close to the electromagnetic drive mechanism is connected to an electrical connection seat electrically connected to the electromagnetic drive mechanism, and one end of the valve housing close to the stop iron is connected to the valve seat.

8. The stiffness valve according to claim 7, characterized in that: An accommodating cavity coaxial with the center hole is provided on the end surface of the stop iron close to the valve seat, and the valve core is at least partially accommodated in the accommodating cavity; a shock-absorbing seat convex axially outward is connected to the end of the valve core close to the stop iron, and a sealing body that seals against the valve port is connected to the free end surface of the valve core.

9. The stiffness valve according to claim 7, characterized in that: A first mounting hole coaxial with the center hole is provided on the end surface of the stop iron close to the armature, and a second mounting hole coaxial with the center hole is provided on the end surface of the armature close to the stop iron, an elastic member is provided between the armature and the stop iron, and one end of the elastic member is connected to the first mounting hole and the other end of the elastic member is connected to the second mounting hole.

10. The stiffness valve according to claim 7, characterized in that: A first annular groove is provided on the outer wall of the stop iron, and a first sealing ring that seals with the inner wall of the valve housing is connected to the first annular groove; one end of the valve housing away from the valve seat is radially contracted inward to form a second annular groove, and a second sealing ring is connected to the second annular groove.

Images