Push type switch valve element with adjustable delayed closing function

Abstract

The utility model relates to a push type switch valve element with an adjustable delayed closing function. The push type switch valve element comprises a shell, a push rod and a piston. A liquid inlet and a liquid outlet are formed in the shell, the piston is in sealing fit with the inner wall of the shell through a first partition plate and a second partition plate to form a pressure cavity, and the piston is communicated with the pressure cavity through a pressure hole; the liquid outlet can be controlled to be opened and closed through displacement of the piston, and circulation and blocking of liquid are achieved; the push rod penetrates through the through cavity of the piston cylinder, a first baffle is arranged at the tail end of the push rod, a return spring is arranged between the push rod and the inner wall of the rear end of the shell, the first baffle is limited through an adjusting screw, and accurate control over displacement of the push rod is achieved. Stepless regulation and control of delay time are achieved through the adjusting screw, the control structure is simplified, the repeated precision of delay adjustment is improved, the closing time sequence requirements of the valve under different working conditions are met, and the valve has the advantages of being compact in structure, easy and convenient to operate, stable in performance and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of switch valve, concretely relates to a press type switch valve core with adjustable delay closing function. BACKGROUND

[0002] In the field of fluid control, press type switch valve core as a kind of common fluid control element, is widely used in various industrial, civil equipment. Traditional press type switch valve core usually realizes the opening and closing of valve core by spring force or fluid resistance, however, these traditional schemes have certain limitations in the realization of delay closing function.

[0003] On the one hand, the scheme of adjusting delay closing time depending on spring stiffness has limited delay range, and once spring parameters are determined, delay time is also relatively fixed, it is difficult to meet the flexible adjustment needs under different working conditions. In addition, the change of spring stiffness requires higher manufacturing precision and material stability, increases production cost and quality control difficulty. On the other hand, the scheme of adjusting delay closing time through fluid resistance realizes the adjustability of delay function to some extent, but the change of fluid resistance is easily affected by external factors such as fluid properties, temperature, pressure, etc. leading to unstable delay time, it is difficult to meet the requirements of high-precision fluid control system. At the same time, traditional press type switch valve core often needs complex electronic elements or control system to intervene when adjusting delay closing time, not only increases the complexity and cost of system, but also reduces the reliability and stability of system. Especially in vibration or harsh environment, electronic elements are easily damaged or failed, leading to the failure of delay closing function. UTILITY MODEL CONTENTS

[0004] The utility model aims at the problems existing in prior art, provides a press type switch valve core with adjustable delay closing function, realizes stepless regulation and control to delay time, simplifies control structure, and the delay adjustment has high repeatability precision, adapts to the closing timing requirements of valve under different working conditions.

[0005] To achieve the above object, the utility model adopts the technical scheme that:

[0006] A push switch valve core with adjustable delay closing function, comprising a shell, a push rod and a piston; the side wall of the shell is provided with a liquid inlet, and the front end of the shell is provided with a liquid outlet; the piston is axially displaceable and arranged in the shell, the piston comprises a column body and first and second partition plates fixedly connected with the column body, and the first and second partition plates are in movable sealing engagement with the inner wall of the shell; the second partition plate and the rear part of the shell form a pressure chamber, and the second partition plate is provided with a pressure hole connected with the pressure chamber; when the piston is displaced forward, the first partition plate can seal and block the liquid outlet; when the piston is displaced backward, the liquid inlet and the liquid outlet are communicated; the middle part of the column body is provided with a through cavity penetrating the axis, the push rod passes through the through cavity, and the push rod and the through cavity have a spacing flow channel therebetween; the rear end of the push rod is provided with a first baffle, and a return spring is arranged between the first baffle and the rear end inner wall of the shell; a step is arranged in the through cavity and used for sealing abutment with the first baffle to limit the maximum forward displacement of the push rod, and when the first baffle abuts against the step, the front end of the push rod protrudes from the piston; the rear end bottom plate of the shell is provided with a threaded hole penetrating therethrough, and an adjusting screw is connected in the threaded hole, and the front end of the adjusting screw is used for limiting the first baffle.

[0007] Further, a limiting column is arranged on the inner wall of the bottom plate of the shell, and the threaded hole penetrates the limiting column.

[0008] Further, the front part of the threaded hole is provided with a thread, and the rear part of the threaded hole is a smooth inner wall; a first sealing ring is sleeved on the rod body of the adjusting screw, the first sealing ring abuts against the nut, and the first sealing ring is in movable sealing contact with the smooth inner wall.

[0009] Further, the rear side end face of the first baffle is provided with a plurality of circumferentially distributed grid strips, and when the piston is displaced backward, the limiting column is inserted between the plurality of grid strips.

[0010] Further, the front end of the shell is provided with a ring cover, and the middle part of the ring cover forms the liquid outlet; the front side end face of the first partition plate is connected with a sealing gasket, and the first partition plate is in sealing abutment with the inner side end face of the ring cover through the sealing gasket, so as to block the liquid outlet.

[0011] Further, the rear end of the spring extends a steel wire, and the steel wire passes through the pressure hole movably.

[0012] Further, the peripheral side of the first baffle is provided with a ring of limiting grooves, a second sealing ring is clamped in the limiting grooves, and the first baffle is in sealing abutment with the step in the through cavity through the second sealing ring.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] Through the contact position of the screw adjusting screw and the push rod, the stepless regulation and control 3s-5s of the delay time are realized;When the screw adjusting screw is screwed in the increased stroke, the contact point of the screw adjusting screw is moved forward, the effective reset stroke of the push rod is shortened, and the delay time is reduced;Conversely, the contact point is moved backward when the screwing-in stroke is reduced, the reset stroke of the push rod is extended, and the delay time is increased;The mechanical adjustment mode does not need to involve electronic components, simplifies the control structure, and has high repeat accuracy of delay adjustment, and meets the closing timing requirements of the valve under different working conditions;

[0015] The screw adjusting screw is independent of the piston, and only needs to use common tools on the rear end bottom plate of the shell to adjust the screwing-in stroke, so that the operation difficulty is simplified, the screw adjusting screw can be directly disassembled from the bottom plate, the maintenance cost is greatly reduced, and the utility model is especially suitable for high-frequency adjustment and calibration in industrial scenes. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0017] Figure 1 It is the overall structure schematic view of the valve core in an embodiment of the application;

[0018] Figure 2 It is the overall structure schematic view of the valve core in an embodiment of the application;

[0019] Figure 3 It is the sectional structure schematic view of the valve core in an embodiment of the application;

[0020] Figure 4 It is the overall structure schematic view of the valve core in an embodiment of the application; Figure 3 The local enlarged view of A in the application;

[0021] In the drawing: 1, shell;2, push rod;3, piston;4, liquid inlet;5, liquid outlet;6, column;7, first partition plate;8, second partition plate;9, pressure chamber;10, pressure hole;11, first baffle;12, return spring;13, adjusting screw;14, limiting column;15, first sealing ring;16, grid;17, ring cover;18, sealing gasket;19, steel wire;20, second sealing ring. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0023] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0024] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0025] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the field of fluid control, the press switch valve core is a common fluid control element, which is widely used in various industrial and civil equipment. The traditional press switch valve core usually realizes the opening and closing of the valve core through spring force or fluid resistance, however, these traditional schemes have certain limitations in the realization of the delay closing function.

[0027] On the one hand, the scheme of relying on spring stiffness to adjust the delay closing time has a limited delay range, and once the spring parameters are determined, the delay time is relatively fixed, which is difficult to meet the flexible adjustment requirements under different working conditions. In addition, the change of spring stiffness has high requirements for manufacturing precision and material stability, which increases the production cost and quality control difficulty. On the other hand, the scheme of adjusting the delay closing time through fluid resistance, although to a certain extent, realizes the adjustability of the delay function, but the change of fluid resistance is easily affected by external factors such as fluid properties, temperature, pressure, etc., resulting in unstable delay time, which is difficult to meet the requirements of high-precision fluid control system. At the same time, when adjusting the delay closing time, the traditional press switch valve core often needs to involve complex electronic components or control systems, which not only increases the complexity and cost of the system, but also reduces the reliability and stability of the system. Especially in the vibration or harsh environment, the electronic components are easily damaged or failed, resulting in the delay closing function unable to work normally.

[0028] In view of the above technical problems, as shown in Figures 1 to 4 The embodiment of the present application provides a press switch valve core with adjustable delay closing function, which comprises a shell 1, a push rod 2 and a piston 3; the side wall of the shell 1 is provided with a liquid inlet 4, and the front end of the shell 1 is provided with a liquid outlet 5; the piston 3 is axially displaceable and arranged in the shell 1, the piston 3 comprises a column body 6 and first and second partition plates 7 and 8 fixedly connected with the column body 6, and the first and second partition plates 7 and 8 are in movable sealing cooperation with the inner wall of the shell 1; the second partition plate 8 and the rear part of the shell 1 form a pressure chamber 9, and the second partition plate 8 is provided with a pressure hole 10 connected with the pressure chamber 9; when the piston 3 is displaced forward, the first partition plate 7 can seal and block the liquid outlet 5; when the piston 3 is displaced backward, the liquid inlet 4 and the liquid outlet 5 are communicated; the middle part of the column body 6 is provided with a through cavity penetrating the axis, the push rod 2 passes through the through cavity, and the push rod 2 and the through cavity have a spacing flow channel therebetween; the rear end of the push rod 2 is provided with a first baffle 11, and a return spring 12 is arranged between the first baffle 11 and the rear end inner wall of the shell 1; a step is arranged in the through cavity and used for sealing abutting with the first baffle 11 to limit the maximum forward displacement of the push rod 2, and when the first baffle 11 abuts against the step, the front end of the push rod 2 protrudes from the piston 3; the rear end bottom plate of the shell 1 is provided with a through screw hole, and an adjusting screw 13 is connected in the screw hole, and the front end of the adjusting screw 13 is used for abutting and limiting the first baffle 11.

[0029] When there is no external force, the return spring 12 pushes the front end of the push rod 2 to seal abut against the step 14 in the through cavity, forming a first sealing barrier; the push rod 2 drives the piston 3 to displace forward, and the first partition plate 7 tightly seals and blocks the liquid outlet 5, blocking the passage between the liquid inlet 4 and the liquid outlet 5; at this time, the front end of the push rod 2 protrudes from the piston 3, so as to be pushed by the external driving mechanism.

[0030] When the external driving mechanism acts on the front end of the push rod 2, the push rod 2 moves backward against the spring force, first releasing the seal with the step 14; when the front end of the push rod 2 is flush with the piston 3, the driving mechanism directly pushes the piston 3 to move backward as a whole, and the second partition plate 8 is separated from the sealing surface of the outlet 5, the inlet 4 is communicated with the outlet 5, and an open circuit is formed;

[0031] During the backward movement of the piston 3, the liquid in the pressure chamber 9 is extruded into the through cavity of the push rod 2, and is communicated with the inlet 4 through the interval flow channel 15; the pressure difference between the inside and outside of the pressure chamber 9 is balanced in real time through the flow of the liquid;

[0032] After the driving mechanism is removed, the return spring 12 pushes the push rod 2 to reset, and when the front end of the push rod 2 contacts the step 14 again, it starts to drive the piston 3 to move forward; the residual liquid in the pressure chamber 9 is slowly supplemented through the pressure hole 10, forming a damping effect and prolonging the reset time of the piston 3;

[0033] By adjusting the contact position of the screw 13 with the push rod 2, the infinite adjustment of the delay time is realized, which is 3s-5s. When the screw is screwed in, the contact point of the screw with the push rod moves forward, the effective reset stroke of the push rod is shortened, and the delay time is reduced; on the contrary, the screw is screwed in, the contact point moves backward, the reset stroke of the push rod is extended, and the delay time is increased. This mechanical adjustment method does not need electronic components, simplifies the control structure, and has high repeat accuracy of delay adjustment, which meets the closing timing requirements of the valve under different working conditions.

[0034] When the push rod 2 is reset through the limiting of the adjusting screw 13, the sealing structure of the first baffle 11 and the through cavity step 14 ensures the isolation of the pressure chamber 9 and the outlet 5, preventing liquid leakage from interfering with the delay parameters. The self-locking property of the thread of the adjusting screw 13 provides stable mechanical limiting, and the preset contact position can be maintained in a vibrating environment, avoiding delay deviation caused by accidental touch.

[0035] The adjusting screw 13 is independent of the piston 3, and only needs to be adjusted by screwing in from the bottom plate at the rear end of the shell 1, which simplifies the operation difficulty, and the adjusting screw 13 can be directly detached from the bottom plate, which greatly reduces the maintenance cost, especially suitable for high-frequency adjustment in industrial scenes.

[0036] In summary, the embodiment introduces the contact position control mechanism of the adjusting screw 13 and the push rod 2, realizes the precise delay closing function of the press type on-off valve core. Compared with the traditional technical scheme relying on spring stiffness or fluid resistance to adjust the time, this scheme directly adjusts the reset stroke of the push rod through mechanical limiting, and combines the dynamic balance principle of the pressure chamber, which ensures the response accuracy and provides a wide range of continuous adjustability of 3s-5s.

[0037] In some embodiments, the bottom plate inner wall of the shell 1 is provided with a limiting column 14, and a threaded hole is arranged through the limiting column 14. By arranging the limiting column 14, a stable mounting structure is provided for the threaded hole, the shaking of the adjusting screw 13 in the shell 1 is eliminated, and liquid leakage into the threaded hole is avoided.

[0038] In some embodiments, the front inner wall of the threaded hole is provided with a thread, and the rear part of the threaded hole is a smooth inner wall; the rod body of the adjusting screw 13 is sleeved with a first sealing ring 15, the first sealing ring 15 abuts against the nut, and the first sealing ring 15 is in movable sealing contact with the smooth inner wall.

[0039] The first sealing ring 15 sleeved on the rod body of the adjusting screw 13 is located between the rod body and the smooth inner wall of the threaded hole, the first sealing ring is in movable sealing contact with the smooth inner wall of the threaded hole, and the first sealing ring can continuously seal while adapting to the position change of the adjusting screw. In some working conditions, such as frequent pressure fluctuations in the pressure cavity 9, the sealing effect can be ensured to be unaffected, the normal work of the valve core is ensured, liquid leakage caused by sealing failure is effectively avoided, and the problem of inaccurate delay control is delayed.

[0040] In some embodiments, the rear side end face of the first baffle plate 11 is provided with a plurality of circumferentially distributed grid bars 16, and when the piston 3 is displaced backward, the limiting column 14 is inserted between the plurality of grid bars 16.

[0041] When the piston 3 retreats, the limiting column 14 is inserted into the plurality of grid bars 16, which limits and guides the piston 3, prevents the piston 3 from deviating or shaking due to vibration, and improves the anti-vibration performance of the valve core.

[0042] In some embodiments, the front end of the shell 1 is provided with a ring cover 17, the middle part of the ring cover 17 forms the liquid outlet 5, the front side end face of the first partition plate 7 is connected with a sealing gasket 18, and the first partition plate 7 is sealingly abutted against the inner side end face of the ring cover 17 through the sealing gasket 18, so as to block the liquid outlet 5.

[0043] The ring cover 17 provides a stable sealing surface and positioning structure for the first partition plate 7, and the sealing gasket 18 increases the sealing property between the first partition plate 7 and the ring cover 17. In the normal closed state, the sealing gasket 18 is deformed by extrusion and can be tightly fitted on the inner side end face of the ring cover 17, thereby effectively preventing liquid leakage.

[0044] In some embodiments, the rear end of the spring 12 extends a steel wire 19, and the steel wire 19 movably passes through the pressure hole 10.

[0045] The steel wire 19 extending from the rear end of the spring 12 movably passes through the pressure hole 10, and the steel wire moves in the pressure hole 10 along with the expansion and contraction of the spring 12, so as to avoid impurities from entering the pressure hole 10 and causing blockage.

[0046] In some embodiments, the first baffle plate 11 is provided with a ring of limiting grooves on the circumferential side, and a second sealing ring 20 is clamped in the limiting grooves, and the first baffle plate 11 is sealed and abuts against the step in the through cavity through the second sealing ring 20.

[0047] The second sealing ring 20 is located between the first baffle plate 11 and the step in the through cavity, and additional sealing protection is provided. Liquid leakage from the gap between the push rod 2 and the through cavity is effectively prevented, the overall sealing performance of the valve core is further enhanced, and the risk of liquid leakage is reduced.

[0048] Although the embodiments of the utility model have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A push-on valve spool having an adjustable time delay closing function, characterized by It comprises a shell (1), a push rod (2) and a piston (3); The side wall of the shell (1) is provided with a liquid inlet (4), and the front end of the shell (1) is provided with a liquid outlet (5); The piston (3) can be axially displaced in the shell (1), and the piston (3) comprises a column (6), a first partition plate (7) and a second partition plate (8) fixedly connected with the column (6), and the first partition plate (7) and the second partition plate (8) are respectively in movable sealing cooperation with the inner wall of the shell (1); the second partition plate (8) and the rear part of the shell (1) form a pressure chamber (9), and the second partition plate (8) is provided with a pressure hole (10) connected with the pressure chamber (9); When the piston (3) is displaced forward, the first partition plate (7) can seal and block the liquid outlet (5); when the piston (3) is displaced backward, the liquid inlet (4) and the liquid outlet (5) are communicated; The middle part of the column (6) is provided with a through cavity penetrating the axis, the push rod (2) passes through the through cavity, and the push rod (2) and the through cavity have a spacing flow channel therebetween; the rear end of the push rod (2) is provided with a first baffle (11), and a return spring (12) is arranged between the first baffle (11) and the rear end inner wall of the shell (1); a step is arranged in the through cavity and used for sealing abutting with the first baffle (11), so as to limit the maximum forward displacement of the push rod (2), and when the first baffle (11) abuts against the step, the front end of the push rod (2) protrudes from the piston (3); The rear end bottom plate of the shell (1) is provided with a threaded hole penetrating therethrough, and an adjusting screw (13) is connected in the threaded hole, and the front end of the adjusting screw (13) is used for abutting and limiting the first baffle (11).

2. The push-on valve trim with adjustable closing delay according to claim 1, characterized in that The inner wall of the bottom plate of the shell (1) is provided with a limiting column (14), and the threaded hole penetrates the limiting column (14).

3. The push-on valve trim with adjustable closing delay according to claim 2, characterized in that The front inner wall of the threaded hole is provided with a thread, and the rear part of the threaded hole is a smooth inner wall; a first sealing ring (15) is sleeved on the rod body of the adjusting screw (13), the first sealing ring (15) abuts against the nut, and the first sealing ring (15) is in movable sealing contact with the smooth inner wall.

4. The push-on valve trim with adjustable closing delay according to claim 2, characterized in that The rear side end face of the first baffle (11) is provided with a plurality of circumferentially distributed grid strips (16), and when the piston (3) is displaced backward, the limiting column (14) is inserted between the plurality of grid strips (16).

5. The push-on valve trim with adjustable closing delay according to claim 1, wherein The front end of the shell (1) is provided with a ring cover (17), and the middle part of the ring cover (17) forms the liquid outlet (5); The front side end face of the first partition plate (7) is connected with a sealing gasket (18), and the first partition plate (7) abuts and seals against the inner side end face of the ring cover (17) through the sealing gasket (18), so as to block the liquid outlet (5).

6. The push-on valve trim with adjustable closing delay according to claim 1, wherein The rear end of the spring (12) extends a steel wire (19), and the steel wire (19) passes through the pressure hole (10) movably.

7. The push-to-close valve trim with adjustable delay-off function of claim 1, wherein, The first baffle plate (11) is provided with a limiting groove in a circle, a second sealing ring (20) is clamped in the limiting groove, and the first baffle plate (11) is sealed and abuts against the step in the through cavity through the second sealing ring (20).

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