A normally open switching valve

Abstract

The present invention relates to the technical field of air path switching valves, and in particular to a normally open switching valve, comprising a switching valve cylinder, an air inlet hole, an air outlet hole, a static valve and a dynamic valve that cooperate with each other are provided on the side wall of the switching valve cylinder, the static valve is arranged on one side of the cavity of the switching valve cylinder, and the dynamic valve is movably arranged on the other side of the cavity of the switching valve cylinder; the normally open switching valve of the present invention is provided with a static valve and a dynamic valve that cooperate with each other in the switching valve cylinder, the static valve is fixedly arranged, and the dynamic valve is movably arranged; an elastic valve core plug is provided on the side of the valve core push rod of the dynamic valve, which has good sealing performance, and when the dynamic valve is subjected to external force, the valve core push rod pushes the valve core plug to move, thereby sealing the air hole in the static valve, and cutting off the gas output path in the normally open switching valve, thereby solving the technical problems of poor sealing, short service life and poor reliability of traditional normally open switching valves.

Description

Technical Field

[0001] The present invention relates to the technical field of gas path switching valves, and in particular to a normally open switching valve. Background Art

[0002] A nitrogen gas spring seals high-pressure nitrogen in a container. External force compresses the nitrogen through a piston rod. When the force is removed, the high-pressure nitrogen expands to generate a certain elastic force. It primarily consists of a cylinder, guide seat, seal ring, O-ring, and piston rod. Nitrogen gas springs offer advantages such as small size, high elastic force, long travel, stable operation, and precision manufacturing. They are capable of performing tasks that conventional elastic components like metal springs, rubber, and air cushions struggle to accomplish. They represent a new generation of flexible and ideal elastic components, and are therefore widely used in the mold industry. During mold opening, the slider drives the upper die upward. Because the upper die blanking plate is equipped with a nitrogen spring, it does not immediately release from the lower die at the moment of mold opening. Instead, it remains pressed against the product until the mold opening stroke reaches the upper die blanking plate's compression stroke, releasing it from the compression position. At this point, the nitrogen spring in the lower die blanking plate loses pressure and pushes upward. This excessive pressure can cause a reverse bending defect in the product. Therefore, the nitrogen spring in the lower die blanking plate is often designed with a delayed return mechanism.

[0003] Gas circuit switching valves, especially normally open switching valves, are often used to logically switch the gas flow of nitrogen springs. By controlling the stopping and starting of gas flow, the nitrogen spring's requirement for delayed pressure output is met. To meet the nitrogen spring's delayed reset function, the normally open switching valve needs to be closed for a period of time, thereby locking the nitrogen spring's piston and eliminating its pressure output. The nitrogen spring will only resume pressure output when the normally open switching valve is reopened, thus achieving the purpose of delayed reset.

[0004] The normally open switching valve in the prior art often has problems such as insufficient sealing performance leading to gas leakage during the switching process, and the traditional normally open switching valve has a short service life and poor reliability. Summary of the Invention

[0005] The purpose of the present invention is to provide a normally open switching valve, which can solve the technical problems of poor sealing, short service life and poor reliability of traditional normally open switching valves by arranging static valves and dynamic valves that cooperate with each other in the valve body.

[0006] To achieve the above objectives, the present invention provides a normally open switching valve, comprising a switching valve cylinder, the switching valve cylinder being a hollow structure, with an air inlet and an air outlet provided on the side wall of the switching valve cylinder, and a static valve and a dynamic valve that cooperate with each other, the static valve being arranged on one side of the switching valve cylinder cavity, and the dynamic valve being movably arranged on the other side of the switching valve cylinder cavity;

[0007] The static valve includes a static core portion and a mounting portion. A radial air hole is formed in the middle of the static core portion along the radial direction of the switching valve. The mounting portion is connected to the inner side wall of the switching valve cylinder. The mounting portion has a transverse air hole formed in the transverse direction of the switching valve. The middle of the transverse air hole is connected to the radial air hole, and the end of the transverse air hole is connected to the air outlet hole.

[0008] The dynamic valve includes a core body, a valve core push rod, and a valve core plug. The core body is a hollow structure with openings at both ends. One side of the core body cooperates with the static core part, and the other side of the core body cooperates with the inner wall gap of the switching valve cylinder body. The valve core plug is made of elastic material and is arranged in the cavity of the core body. One end of the valve core plug can extend out of the cavity of the core body and seal the radial air hole. One end of the valve core push rod is arranged in the cavity of the core body and connected to the valve core plug, and the other end of the valve core push rod extends out of the cavity of the core body.

[0009] As a preferred solution, the valve core plug includes a movable part and a sealing part. The movable part is arranged in the cavity of the core body. The size of the sealing part is smaller than that of the movable part. The sealing part is provided with a recess that can block the radial air hole.

[0010] As a preferred solution, the dimple is conical, and the outer diameter of the dimple is larger than the diameter of the radial pore.

[0011] The dimple not only ensures effective sealing but also prevents the normally open switching valve from being sucked into the radial air holes of the static valve when resetting, thereby causing it to become stuck and preventing the normally open switching valve from resetting properly and the nitrogen spring from functioning properly. Because the valve plug is made of elastic material and is easily deformed, the closed state of the switching valve may be affected by high-pressure gas, and the protruding head of the valve plug may penetrate into the radial air holes of the static valve.

[0012] As a preferred solution, the valve core push rod is stepped, including a stem portion and a tail portion, the outer diameter of the stem portion is smaller than the outer diameter of the tail portion, and the end of the stem portion is spherical.

[0013] As a preferred solution, the dynamic valve further comprises a valve core support ring and a dynamic sealing ring which are sequentially sleeved on the rod, and the dynamic sealing ring is close to the end of the rod.

[0014] As a preferred solution, a groove is provided on the side surface of the static core portion, and the core body is loosely fitted in the groove.

[0015] As a preferred solution, a vent hole is provided on the side wall of the groove, and the axis of the vent hole is perpendicular to the axis of the transverse air hole.

[0016] As a preferred solution, it further comprises a static sealing ring, which is sleeved on the outer side of the static core part.

[0017] As a preferred solution, a return spring is further included, which is arranged in the cavity of the switching valve cylinder and is sleeved on the outside of the core.

[0018] As a preferred solution, it also includes an anti-loosening blockage, which is a hollow structure and is threadedly connected to the inner wall of the switching valve cylinder body. The end of the valve core push rod is located in the cavity of the anti-loosening blockage.

[0019] Beneficial effects of the present invention:

[0020] The normally open switching valve of the present invention is provided with a static valve and a dynamic valve that cooperate with each other in the switching valve cylinder body. The static valve is fixedly arranged and the dynamic valve is movably arranged. An elastic valve core plug is provided on the side of the valve core push rod of the dynamic valve, which has good sealing performance. Under the action of external force, the valve core push rod pushes the core body and the valve core plug to move, thereby sealing the air hole in the static valve and cutting off the gas output path in the normally open switching valve. After the external force is removed, the valve core push rod returns to its position, and the core body is pushed back under the action of the reset spring, the valve core plug and the air hole in the static valve are loosened, and the normally open switching valve returns to an open state.

[0021] Therefore, the present invention can solve the technical problems of poor sealing, short service life and poor reliability of traditional normally open switching valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the decomposition of the present invention.

[0023] Figure 2 It is a schematic diagram of the assembly of the present invention.

[0024] Figure 3 It is a cross-sectional view of the normally open state of the present invention.

[0025] Figure 4 It is a cross-sectional view of the closed state of the present invention.

[0026] Figure 5 It is a three-dimensional schematic diagram of a dynamic valve.

[0027] Figure 6 This is a cross-sectional view of a dynamic valve.

[0028] Figure 7 It is a three-dimensional schematic diagram of the dynamic valve core body.

[0029] Figure 8 It is a three-dimensional schematic diagram of the dynamic valve core plug.

[0030] Figure 9 It is a three-dimensional schematic diagram of a static valve.

[0031] Figure 10 This is a static valve cross-sectional view.

[0032] Figure 11 It is a three-dimensional schematic diagram of the switching valve cylinder.

[0033] Figure 12This is a cross-sectional view of the switching valve cylinder.

[0034] Description of reference numerals:

[0035] Switching valve cylinder 1, static valve 2, dynamic valve 3, return spring 4, anti-loosening and anti-clogging 5;

[0036] Switching valve cylinder 1: air inlet 11, air outlet 12;

[0037] Static valve 2: static core 21, mounting portion 22, groove 23, radial air holes 24, transverse air holes 25, vent holes 26, static sealing ring 27;

[0038] Dynamic valve 3: core body 31, valve core push rod 32, valve core plug 33, valve core support ring 34, dynamic sealing ring 35;

[0039] Core 31: flange portion 311, dynamic core portion 312;

[0040] The valve core push rod 32 includes a rod portion 321 and a tail portion 322 ;

[0041] The valve core plug 33 includes a movable portion 331 , a sealing portion 332 , and a recess 333 . DETAILED DESCRIPTION

[0042] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the drawings only show portions relevant to the present invention, not all of them.

[0043] In the description of the present invention, it should be noted that the terms "center," "up," "down," "left," "right," "vertical," "horizontal," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed or detachable connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0045] The present invention relates to a normally open switching valve, which is commonly used for the logic switching control of gas flow by nitrogen springs. By controlling the stopping and starting of gas flow, the requirement of nitrogen springs to delay pressure output is met. The logic-controlled normally open switching valve is used to lock the piston rod of the nitrogen spring at the bottom dead center and control the return stroke of the piston rod to realize the delay function. The method for controlling the delay function is to trigger the dynamic valve of the switching valve to open or close through the air pressure signal provided by the press control system or the stamping die structure design. The logic-controlled normally open switching valve is used for controllable delay nitrogen springs, and nitrogen springs are used in drawing dies that perform two forming steps by a single press stroke.

[0046] The normally open switching valve is installed on the base as an independent unit through the outer surface of the switching valve cylinder and the corresponding matching surface of the nitrogen spring. The two air channels of the normally open switching valve and the two air channels on the nitrogen spring are interconnected in the normally open state. It realizes logical switching control of medium and high pressure gases according to the control requirements of the nitrogen spring for gas. During switching, it can prevent high-speed flowing gas from blocking the air channel and prevent gas leakage when the valve core is dynamically switched, ensuring the logical switching control of the gas flow by the nitrogen spring. The logical switching control instruction is to provide thrust through other devices to trigger the movement of the dynamic valve, and then realize logical control by opening and closing the static valve air channel. When there is no logical control instruction, the air channel of the normally open switching valve is in the normally open state and the gas path is unobstructed. For details, see Figure 2 When a logic control command is generated, the dynamic valve moves, causing the air passage of the normally open switching valve to be closed and blocked. For details, see Figure 3 .

[0047] like Figures 1 to 4As shown, the normally open switching valve of the present invention includes a switching valve cylinder 1. The switching valve cylinder 1 is a hollow structure, including an air inlet chamber and an air outlet chamber for the input and output of gas. An air inlet hole 11 is provided on the cylinder side wall of the air inlet chamber, and an air outlet hole 12 is provided on the cylinder side wall of the air outlet chamber. The axes of the air inlet hole 11 and the air outlet hole 12 are parallel to each other. The air inlet hole 11 and the air outlet hole 12 extend from one end of the switching valve cylinder side wall to the other end respectively. The outer shape of the switching valve cylinder has the functions of gas sealing and assembly limiting. The inner cavity has the functions of installing and positioning the valve core position and gas sealing. The side wall of the cylinder has an airway hole connecting the inside and the outside. There are two holes on the cylindrical side wall of the switching valve cylinder, namely the air inlet hole 11 for gas to enter the airway and the air outlet hole 12 for gas to output the airway after switching control. The protruding cylindrical surfaces on both sides of the airway hole are the mounting surfaces for the nitrogen spring base. The sealing between the mounting surfaces is achieved by a sealing ring to prevent gas leakage. The length of the cavity of the switching valve cylinder 1 is greater than the total length of the valve core, which can effectively protect the valve core.

[0048] The normally open switching valve also includes a static valve 2 and a dynamic valve 3 that cooperate with each other. The static valve 2 is positioned on one side of the cavity of the switching valve cylinder 1, while the dynamic valve 3 is movably positioned on the other side of the cavity. It also includes a return spring 4, which is positioned within the cavity of the switching valve cylinder 1 and sleeved onto the exterior of the core 31. It also includes an anti-loosening plug 5, a position-limiting component that limits the position of the dynamic valve and prevents it from falling out. The anti-loosening plug 5 is a hollow structure that is threadedly connected to the inner wall of the switching valve cylinder 1. The end of the valve core push rod 32 is located within the cavity of the anti-loosening plug 5.

[0049] like Figures 5 to 8 As shown, the dynamic valve 3 comprises a core 31, a valve core push rod 32, and a valve core plug 33. The dynamic valve 3 is the core component that realizes the switching valve function and extends its service life. When an external force pushes the valve core push rod 32, it drives the core 31, overcoming the pressure of the return spring 4 and causing the entire assembly to move. This pushes the valve core plug 33 to seal the radial air holes 24 of the static valve 2, thus closing the gas passage within the switching valve cylinder 1. When the external force is removed, the valve core push rod 32 returns to its original position, and the core 31 is pushed back by the return spring 4, thereby releasing the valve core plug 33 from the radial air holes 24, and the normally open switching valve returns to its open state.

[0050] The core 31 is a hollow structure with two open ends. It includes a flange 311 and a dynamic core 312. The dynamic core 312 of the core 31 has a clearance fit with the groove 23, while the flange 311 of the core 31 has a clearance fit with the inner wall of the switching valve cylinder 1. The outer diameter of the flange 311 is larger than that of the dynamic core 312. The flange 311 is used to withstand the pressure of the return spring 4, while the dynamic core 312 is used to lock the valve core plug 33 and limit the position of the movable portion 331.

[0051] The valve plug 33 is made of an elastic material, such as rubber, and has elastic sealing and high-temperature resistance. It is positioned within the cavity of the core 31. One end of the valve plug 33 can extend from the cavity of the core 31 and seal the radial air holes 24. The valve plug 33 includes a movable portion 331 and a sealing portion 332. The movable portion 331 is positioned within the cavity of the core 31. The sealing portion 332 is smaller than the movable portion 331 and is provided with a recess 333 that blocks the radial air holes 24. The recess 333 is conical, with an outer diameter larger than the diameter of the radial air holes 24. The recess 333 ensures effective sealing and prevents the recess 333 from being drawn into the radial air holes 24 of the static valve 2 when the normally open switching valve is reset, thereby causing the normally open switching valve to fail to reset properly and the nitrogen spring to malfunction. Because the valve plug 33 is made of an elastic material and is easily deformed, the closed state of the switching valve may be affected by high-pressure gas. The protruding head of the valve plug 33 may become lodged in the radial air hole 24 of the static valve and become stuck, preventing it from returning to its normal state as the dynamic valve 3 rebounds. This can affect the normal operation of the normally open switching valve and lead to product failure. The material selection of the valve plug 33 and the structural design of the recess 333 are key to ensuring the sealing performance, reliability, and service life of the normally open switching valve.

[0052] One end of the valve core push rod 32 is positioned within the cavity of the core body 31 and connected to the valve core plug 33. The other end of the valve core push rod 32 extends out of the cavity of the core body 31. The valve core push rod 32 has a stepped shape, comprising a stem portion 321 and a tail portion 322. The outer diameter of the stem portion 321 is smaller than that of the tail portion 322. The end of the stem portion 321 is spherical to reduce external thrust on this contact surface, thereby minimizing the adverse effects of movement. The large outer diameter of the tail portion 322 ensures a sufficiently large contact area between its end face and the valve core plug 33.

[0053] The dynamic valve 3 also includes a spool support ring 34 and a dynamic seal ring 35, which are sequentially mounted on the stem 321. The dynamic seal ring 35 is located near the end of the stem 321. The spool support ring 34 supports and guides the spool push rod 32, ensuring the accuracy of the spool push rod 32 during movement. The dynamic seal ring 35 is a sealing component for the spool push rod 32, ensuring that pressurized gas does not leak during movement.

[0054] like Figure 9 、 Figure 10As shown, the static valve 2 is made of steel and consists of a stepped shaft consisting of a static core part 21 and a mounting part 22. The outer diameter of the static core part 21 is smaller than the outer diameter of the mounting part 22. The static core part 21 and the mounting part 22 are integrally formed. The mounting part 22 is fixedly connected to the switching valve cylinder body 1 by threads. The static valve 2 remains stationary throughout the entire switching process. A static sealing ring 27 is sleeved on the outer side of the static core part 21 to ensure that the pressurized gas of the switching valve does not leak during the movement.

[0055] The side of the static core portion 21 is provided with a groove 23. A vent hole 26 is defined in the sidewall of the groove 23 to ensure smooth gas flow without obstruction from plugs or other obstructions when the switching valve is normally open. The axis of the vent hole 26 is perpendicular to the axis of the transverse air hole 25. A radial air hole 24 is defined in the middle of the static core portion 21 along the radial direction of the switching valve, communicating with the groove 23. The mounting portion 22 is connected to the inner sidewall of the switching valve cylinder 1. The mounting portion 22 defines a transverse air hole 25 along the transverse direction of the switching valve. The middle portion of the transverse air hole 25 communicates with the radial air hole 24, and the end portion of the transverse air hole 25 communicates with the air outlet 12. The bottom surface of the groove 23 of the static core portion 21 may also be provided with an annular protrusion to form a concave-convex fit with the valve core plug 33, thereby achieving a better sealing effect.

[0056] An anti-loosening retaining ring for limiting is also installed between the outer side wall of the static valve 2 and the cavity of the switching valve cylinder 1 to limit the position of the static valve 2 and prevent it from falling off.

[0057] Working process of normally open switching valve:

[0058] When the external force pushes the valve core push rod 32 to move, the core body 31 overcomes the elastic force of the return spring 4 under the drive of the valve core push rod 32, so that the dynamic core part 312 moves into the groove 23 of the static valve 2, forming a concave-convex seal; at the same time, the valve core push rod 32 pushes the valve core plug 33, so that the sealing part 332 extends out of the dynamic core part 312 of the core body 31, and the concave groove 333 on the side of the sealing part 332 seals the radial air hole 24 of the static valve 2. Because the valve core plug 33 is made of elastic material, it has good sealing performance, thereby realizing the closure of the gas channel in the switching valve cylinder 1, so that the normally open switching valve is in a closed state. Figure 4 shown.

[0059] After the external force is removed, the valve core push rod 32 returns to its original position, and the core body 31 is pushed back by the return spring 4. The dynamic core part 312 is separated from the groove 23, and the recess 333 of the valve core plug 33 is loosened from the radial air hole 24, so that the normally open switching valve is restored to the open state. Because the recess 333 is set at the end of the valve core plug 33, it can effectively prevent the valve core plug 33 from being sucked into the radial air hole 24 under the action of high-pressure gas, thereby causing the dynamic valve 3 to fail to recover normally. The open state of the normally open switching valve, such as Figure 3 shown.

[0060] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A normally open switching valve, comprising a switching valve cylinder (1), wherein the switching valve cylinder (1) is a hollow structure, and an air inlet (11) and an air outlet (12) are provided on a side wall of the switching valve cylinder (1), characterized in that: It also includes a static valve (2) and a dynamic valve (3) that cooperate with each other, wherein the static valve (2) is arranged on one side of the cavity of the switching valve cylinder (1), and the dynamic valve (3) is movably arranged on the other side of the cavity of the switching valve cylinder (1); The static valve (2) comprises a static core portion (21) and a mounting portion (22). A radial air hole (24) is provided in the middle of the static core portion (21) along the radial direction of the switching valve. The mounting portion (22) is connected to the inner side wall of the switching valve cylinder (1). The mounting portion (22) is provided with a transverse air hole (25) along the transverse direction of the switching valve. The middle portion of the transverse air hole (25) is communicated with the radial air hole (24), and the end portion of the transverse air hole (25) is communicated with the air outlet hole (12). The dynamic valve (3) includes a core body (31), a valve core push rod (32), and a valve core plug (33). The core body (31) is a hollow structure with two ends open. One side of the core body (31) cooperates with the static core part (21), and the other side of the core body (31) cooperates with the inner wall gap of the switching valve cylinder (1). The valve core plug (33) is made of elastic material and is arranged in the cavity of the core body (31). One end of the valve core plug (33) can extend out of the cavity of the core body (31) and seal the radial air hole (24). The valve core plug (33) includes A movable portion (331) and a sealing portion (332), wherein the movable portion (331) is arranged in the cavity of the core body (31), the size of the sealing portion (332) is smaller than the size of the movable portion (331), and the sealing portion (332) is provided with a recess (333) capable of blocking the radial air hole (24); the recess (333) is used to ensure the sealing performance of the normally open switching valve and prevent the recess (333) from being sucked into the radial air hole (24) of the static valve when the normally open switching valve is reset, thereby being stuck and causing the normally open switching valve to fail to reset normally; One end of the valve core push rod (32) is arranged in the cavity of the core body (31) and connected to the valve core plug (33), and the other end of the valve core push rod (32) extends out of the cavity of the core body (31).

2. The normally open switching valve according to claim 1, characterized in that: The recess (333) is conical, and the outer diameter of the recess (333) is larger than the aperture of the radial pore (24).

3. The normally open switching valve according to claim 1 or 2, characterized in that: The valve core push rod (32) is stepped and comprises a rod portion (321) and a tail portion (322). The outer diameter of the rod portion (321) is smaller than the outer diameter of the tail portion (322), and the end of the rod portion (321) is spherical.

4. The normally open switching valve according to claim 3, characterized in that: The dynamic valve (3) further comprises a valve core support ring (34) and a dynamic sealing ring (35) which are sequentially sleeved on the rod (321), and the dynamic sealing ring (35) is close to the end of the rod (321).

5. The normally open switching valve according to claim 1 or 4, characterized in that: A groove (23) is provided on the side surface of the static core portion (21), and the core body (31) is clearance-matched with the groove (23).

6. The normally open switching valve according to claim 5, characterized in that: A vent hole (26) is provided on the side wall of the groove (23), and the axis of the vent hole (26) is perpendicular to the axis of the transverse air hole (25).

7. The normally open switching valve according to claim 6, characterized in that: It also includes a static sealing ring (27), which is sleeved on the outside of the static core part (21).

8. The normally open switching valve according to claim 7, characterized in that: It also includes a return spring (4), which is arranged in the cavity of the switching valve cylinder (1) and is sleeved on the outside of the core (31).

9. The normally open switching valve according to claim 8, characterized in that: It also includes an anti-loosening plug (5), which is a hollow structure and is threadedly connected to the inner wall of the switching valve cylinder (1). The end of the valve core push rod (32) is located in the cavity of the anti-loosening plug (5).

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