Time-delay reversing liquid separation valve element

Abstract

The utility model discloses a time-delay reversing liquid separation valve core which comprises a shell, and a magnetic button switch, an isolation cover, a push rod and a piston are arranged in the shell. The isolation hood is fixed to the shell, the magnetic button switch is arranged on the upper side of the isolation hood, the push rod is movably arranged in a mounting groove in the lower side of the isolation hood, and the upper end is connected with the permanent magnet. The piston comprises a column body, a first sealing partition plate and a second sealing partition plate, the first sealing partition plate is in sliding sealing fit with the inner wall of the shell, and the column body is provided with a flow channel. An annular interval is formed between the second sealing partition plate and the inner wall of the shell, an upper limiting slope table and a lower limiting slope table are arranged on the inner wall of the shell, and the second sealing partition plate moves between the upper limiting slope table and the lower limiting slope table and abuts against the upper limiting slope table in a sealed mode. The lower end of the column body is sleeved with a sealing sleeve which abuts against the lower limiting slope table in a sealed mode; through the clutch linkage of the push rod and the piston and the control of the flow channel and the pressure balance hole, time-delay reversing, water hammer effect reduction, pipeline vibration reduction and the like are realized, and the service life of the valve is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of liquid distribution valve, specifically to a time-delay reversing liquid distribution valve core. BACKGROUND

[0002] As the core component of fluid control system, reversing valve is widely used in water supply, heating and ventilation, industrial automation and other fields, and its function reliability and service life directly affect the operation efficiency of the whole system. Traditional reversing valve adopts mechanical or electromagnetic driving structure to realize flow passage switching by directly controlling the displacement of valve core. However, such design generally has the following technical defects.

[0003] During the rapid switching process of traditional valve core, water hammer effect is easily caused by the sudden change of liquid flow direction, which leads to pipeline vibration, seal wear and even structure damage, and shortens the service life of valve. In addition, the conventional design lacks time-delay buffer mechanism, and the switching process relies on instantaneous external force driving, so the liquid flow path switching is harsh, which easily causes pressure fluctuation and affects the stability of downstream equipment. TECHNICAL SOLUTION

[0004] The utility model aims at the problems existing in the prior art, and provides a time-delay reversing liquid distribution valve core, which realizes time-delay reversing, reduces water hammer effect, reduces pipeline vibration and prolongs the service life of valve through the clutch linkage of push rod and piston, combined with the control of flow passage and pressure balance hole.

[0005] To achieve the above purpose, the utility model adopts the technical scheme of:

[0006] A delayed-response liquid dispensing valve core includes a housing. The housing has a first outlet and an inlet below the first outlet on its side wall, and a second outlet at its bottom. The housing's inner cavity includes a magnetic push-button switch, an isolation cover, a push rod, and a piston. The isolation cover is fixedly mounted on the housing. The magnetic push-button switch is located on the upper side of the isolation cover, and a mounting groove is provided on the lower side of the isolation cover. The push rod is vertically movable within the mounting groove, and a permanent magnet is connected to its upper end. The magnetic push-button switch drives the push rod to move up and down by moving the permanent magnet up and down. The piston includes a cylinder and a first and a second sealing plate sequentially connected to the cylinder. The first sealing plate slides and seals against the inner wall of the housing. The first sealing plate has a pressure balance hole that runs vertically through it; the column has a flow channel that runs along its axis, and when the lower end of the push rod abuts against the piston, the push rod blocks the upper opening of the flow channel; the second sealing plate has an annular gap with the inner wall of the housing; the inner wall of the housing has an upper limit ramp and a lower limit ramp, and the second sealing plate is movably located between the upper limit ramp and the lower limit ramp, and can seal against the upper limit ramp; a sealing sleeve is fitted on the outer side of the lower end of the column, and the sealing sleeve can seal against the lower limit ramp; the liquid inlet is located between the upper limit ramp and the lower limit ramp, and the first liquid outlet is always located between the first sealing plate and the second sealing plate.

[0007] Furthermore, a first sealing ring is fitted around the outer periphery of the first partition plate, and the first partition plate slides in contact with the inner wall of the housing through the first sealing ring; a second sealing ring is fitted around the outer periphery of the second partition plate, and the second partition plate seals against the upper limit ramp through the second sealing ring.

[0008] Furthermore, a spring is provided between the isolation cover and the piston. The spring is sleeved on the outside of the push rod, and a vertical steel wire extends from one end of the spring. The steel wire is movably inserted into the pressure balance hole.

[0009] Furthermore, the lower part of the sealing sleeve has a truncated cone structure, and the sealing sleeve seals against the lower limiting ramp through its conical surface.

[0010] Furthermore, a filter screen is fixedly provided on the outside of the liquid inlet of the housing.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The hydraulic system forms a double-acting circuit after the push rod is separated, realizes automatic pressure compensation, and makes the switching process not need extra power input; through the synergy of the liquid flow thrust below the second partition plate and the flow channel guide flow, a dynamic pressure difference control is formed, which can realize delayed switching, and the gradual switching can effectively eliminate water hammer effect, reduce the pressure impact peak, prolong the service life of the valve, and is especially suitable for precise fluid control systems.

[0013] Through the three-dimensional layout of the inner cavity of the shell, the magnetic drive module, the hydraulic control unit and the reversing execution mechanism are integrated in a single valve body, the push rod, the piston and the flow channel are coaxially arranged, the overall volume is reduced, the installation space requirement is reduced, and the utility model is especially suitable for space limited scenes.

[0014] A spring is arranged between the isolation cover and the piston, one end of the spring extends a vertical steel wire, the steel wire is movably inserted into the pressure balance hole, when the piston is displaced up and down, the spring is compressed and released, the steel wire moves up and down in the pressure balance hole, impurities are prevented from blocking the pressure balance hole, and the service life of the valve core is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0016] Fig. 1 It is a whole structure schematic view of the liquid distribution valve core in an embodiment of the present application.

[0017] Fig. 2 It is a sectional structure schematic view of the liquid distribution valve core in an embodiment of the present application.

[0018] Fig. 3 It is a structure schematic view of the push rod and the piston in an embodiment of the present application.

[0019] In the figure: 1, shell; 2, first liquid outlet; 3, liquid inlet; 4, second liquid outlet; 5, magnetic button switch; 6, isolation cover; 7, push rod; 7a, permanent magnet block; 8, piston; 9, column; 9a, flow channel; 10, first partition plate; 10a, pressure balance hole; 11, second partition plate; 12, upper limit slope table; 13, lower limit slope table; 14, sealing sleeve; 15, first sealing ring; 16, second sealing ring; 17, spring; 17a, steel wire; 18, filter screen cover. DETAILED DESCRIPTION

[0020] The technical solutions of the utility model will be clearly and completely described below in combination with the drawings in the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0021] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the utility model product is used, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, structure and operation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0022] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, 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.

[0023] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "setting", "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0024] As the core component of the fluid control system, the reversing valve is widely used in water supply, heating, industrial automation and other fields, and its function reliability and service life directly affect the operation efficiency of the whole system. The traditional reversing valve adopts mechanical or electromagnetic driving structure, and realizes flow passage switching by directly controlling the displacement of the valve core. However, such design generally has the following technical defects.

[0025] During the rapid switching process of the traditional valve core, water hammer effect is easily caused due to the sudden change of the liquid flow direction, which leads to pipeline vibration, sealing element wear and even structure damage, and shortens the service life of the valve. In addition, the conventional design lacks a delay buffer mechanism, and the switching process relies on instantaneous external force driving, so the liquid flow path switching is harsh, which easily causes pressure fluctuation and affects the stability of the downstream equipment.

[0026] Regarding the above technical issues, such as Figs. 1 to 3 As shown, this application embodiment provides a delayed reversing liquid distribution valve core, including a housing 1. The side wall of the housing 1 is provided with a first liquid outlet 2 and a liquid inlet 3 located below the first liquid outlet 2. The bottom of the housing 1 is provided with a second liquid outlet 4. The inner cavity of the housing 1 is provided with a magnetic push button switch 5, an isolation cover 6, a push rod 7, and a piston 8. The isolation cover 6 is fixedly disposed on the housing 1. The magnetic push button switch 5 is disposed on the upper side of the isolation cover 6. The lower side of the isolation cover 6 is provided with a mounting groove. The push rod 7 is vertically movably disposed in the mounting groove. The upper end of the push rod 7 is connected to a permanent magnet block 7a. The magnetic push button switch 5 drives the permanent magnet block 7a to move up and down, thereby driving the push rod 7 to move up and down. The piston 8 includes a column 9 and a first sealing plate 10 and a second sealing plate 11 connected to the column 9 in sequence. The first sealing plate 10 slides and seals against the inner wall of the housing 1. In conjunction with the above, the first sealing plate 10 is provided with a pressure balance hole 10a that runs vertically through the body; the column 9 is provided with a flow channel 9a that runs along the axis, and when the lower end of the push rod 7 abuts against the piston 8, the push rod 7 blocks the upper opening of the flow channel; the second sealing plate 11 has an annular gap between it and the inner wall of the housing 1; the inner wall of the housing 1 is provided with an upper limit ramp 12 and a lower limit ramp 13, and the second sealing plate 11 is movably located between the upper limit ramp 12 and the lower limit ramp 13, and can seal against the upper limit ramp 12; a sealing sleeve 14 is fitted on the outer side of the lower end of the column 9, and the sealing sleeve 14 can seal against the lower limit ramp 13; the liquid inlet 3 is located between the upper limit ramp 12 and the lower limit ramp 13, and the first liquid outlet 2 is always located between the first sealing plate 10 and the second sealing plate 11.

[0027] In this embodiment, the liquid distribution valve core achieves circuit switching through the synergistic effect of magnetic drive and hydraulic balance. When the magnetic push button switch 5 drives the push rod 7 to move downward, the permanent magnet block 7a drives the push rod 7 to press the piston 8 downward, so that the sealing sleeve 14 and the lower limit ramp 13 seal and close the second liquid outlet 4. At this time, the liquid flows from the liquid inlet 3 through the annular gap between the second sealing plate 11 and the housing 1 into the cavity between the first sealing plate 10 and the second sealing plate 11, and is output from the first liquid outlet 2, realizing the first circuit switching state.

[0028] When the push rod 7 blocks the flow channel 9a, the pressure balance hole 10a maintains the balance of the cavity pressure. When the push rod 7 moves up and separates from the piston 8, the flow channel 9a is opened to form a double-acting circuit; part of the liquid flows into the upper cavity of the piston 8 through the pressure balance hole 10a, and is guided to the second liquid outlet 4 through the flow channel 9a; the other part of the liquid flow generates an upward thrust below the second partition plate 11, and cooperates with the flow guiding effect of the flow channel 9a to form a pressure difference, so that the piston 8 gradually slows down and moves upward until the first partition plate 10 seals the upper limit slope table 12, at which time the first liquid outlet 2 is blocked, and the liquid flow is completely switched to the second liquid outlet 4 for output, realizing the second branch state.

[0029] The hydraulic system forms a double-acting circuit after the push rod 7 is separated, realizes automatic pressure compensation, and does not need additional power input in the switching process through the layout of the pressure balance hole 10a and the flow channel 9a.

[0030] Through the synergistic effect of the liquid flow thrust below the second partition plate 11 and the flow guiding of the flow channel 9a, a dynamic pressure difference control is formed, which can realize adjustable delay switching of 0.5-3 seconds. The gradual switching can effectively eliminate the water hammer effect, reduce the pressure impact peak, prolong the service life of the valve, and is especially suitable for precise fluid control systems.

[0031] Through the three-dimensional layout of the inner cavity of the shell 1, the magnetic drive module, the hydraulic control unit and the reversing execution mechanism are integrated in a single valve body, and the push rod 7, the piston 8 and the flow channel 9a are coaxially arranged, which reduces the overall volume and reduces the installation space requirement, and is especially suitable for space-limited scenes.

[0032] It should be noted that the magnetic button switch 5 can adopt existing technologies, such as the magnetic transmission structure provided in CN214274607U, that is, when the magnetic button switch 5 is pressed, the push rod 7 is displaced through magnetic force, thereby achieving the effect of isolating the liquid flow. The working principle of this scheme has been disclosed in detail in the existing technology.

[0033] In some embodiments, the first partition plate 10 is sleeved with a first sealing ring 15 on the outer periphery, and the first partition plate 10 is in sliding contact with the inner wall of the shell 1 through the first sealing ring 15; the second partition plate 11 is sleeved with a second sealing ring 16 on the outer periphery, and the second partition plate 11 is in sealing abutment with the upper limit slope table 12 through the second sealing ring 16.

[0034] The sealing structure of the first sealing ring 15 and the second sealing ring 16 is adopted in this embodiment, which further improves the sealing performance. The first sealing ring 15 ensures the sliding sealing between the first partition plate 10 and the inner wall of the shell 1, so that the liquid flow does not leak during the switching process. The second sealing ring 16 ensures the sealing performance of the second partition plate 11 when it abuts against the upper limit slope table 12, thereby ensuring the reliability of the branch switching.

[0035] In some embodiments, a spring 17 is arranged between the isolating cover 6 and the piston 8, the spring 17 is sleeved outside the push rod 7, one end of the spring 17 extends out of a vertical steel wire 17a, and the steel wire 17a is movably inserted into the pressure balance hole 10a.

[0036] When the piston 8 is displaced up and down, the spring 17 is compressed and released, and the steel wire 17a of the spring 17 moves up and down in the pressure balance hole 10a, so as to prevent impurities from blocking the pressure balance hole 10a and prolong the service life.

[0037] In some embodiments, the lower part of the sealing sleeve 14 is a conical table structure, and the sealing sleeve 14 is sealed and abuts against the lower limiting slope table 13 through the conical surface thereof.

[0038] When the piston 8 is lowered to a predetermined position, the conical surface of the sealing sleeve 14 is in contact with the lower limiting slope table 13, and the design of the conical table structure enables the sealing sleeve 14 to adaptively adjust the contact area and pressure distribution when abutting against the lower limiting slope table 13, thereby improving the durability and anti-leakage capability of the sealing.

[0039] In some embodiments, the housing 1 is fixedly provided with a filter cover 18 outside the liquid inlet 3. When liquid enters the valve core inside through the liquid inlet 3, it will first pass through the filter cover 18. The filter cover 18 can intercept impurities and particulate matters in the liquid, prevent them from entering the valve core inside to cause abrasion or blockage to the sealing element, the piston 8 and the like, thereby ensuring the normal work of the valve core and prolonging the service life.

[0040] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the 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 delayed-reverse proportional valve spool, characterized by, The shell (1) is provided with a first liquid outlet (2) and a liquid inlet (3) below the first liquid outlet (2), and the bottom of the shell (1) is provided with a second liquid outlet (4); The inner cavity of the shell (1) is provided with a magnetic button switch (5), an isolation cover (6), a push rod (7) and a piston (8); the isolation cover (6) is fixedly arranged on the shell (1), the magnetic button switch (5) is arranged on the upper side of the isolation cover (6), the lower side of the isolation cover (6) is provided with a mounting groove, the push rod (7) is vertically movably arranged in the mounting groove, and the upper end of the push rod (7) is connected with a permanent magnet block (7a); the magnetic button switch (5) drives the permanent magnet block (7a) to move up and down, thereby driving the push rod (7) to move up and down; The piston (8) comprises a column body (9), a first partition plate (10) and a second partition plate (11) connected with the column body (9) in sequence; The first partition plate (10) is in sliding sealing cooperation with the inner wall of the shell (1), and the first partition plate (10) is provided with a pressure balance hole (10a) penetrating upward and downward; the column body (9) is provided with a flow channel (9a) penetrating along the axis, and when the lower end of the push rod (7) abuts against the piston (8), the push rod (7) blocks the upper opening of the flow channel; The second partition plate (11) has an annular space with the inner wall of the shell (1); the inner wall of the shell (1) is provided with an upper limiting slope table (12) and a lower limiting slope table (13), the second partition plate (11) is movably arranged between the upper limiting slope table (12) and the lower limiting slope table (13) and can be in sealing abutment with the upper limiting slope table (12); the lower end of the column body (9) is provided with a sealing sleeve (14), and the sealing sleeve (14) can be in sealing abutment with the lower limiting slope table (13); The liquid inlet (3) is located between the upper limiting slope table (12) and the lower limiting slope table (13), and the first liquid outlet (2) is always located between the first partition plate (10) and the second partition plate (11).

2. A delayed kick shut-off spool valve core according to claim 1, wherein, The outer periphery of the first partition plate (10) is provided with a first sealing ring (15), and the first partition plate (10) is in sliding contact with the inner wall of the shell (1) through the first sealing ring (15); The outer periphery of the second partition plate (11) is provided with a second sealing ring (16), and the second partition plate (11) is in sealing abutment with the upper limiting slope table (12) through the second sealing ring (16).

3. A delayed kick shut-off spool valve core according to claim 1, wherein, A spring (17) is arranged between the isolation cover (6) and the piston (8), the spring (17) is sleeved on the outer side of the push rod (7), one end of the spring (17) extends out of a vertical steel wire (17a), and the steel wire (17a) is movably inserted into the pressure balance hole (10a).

4. The delayed kick shut-off spool valve core of claim 1, wherein, The lower part of the sealing sleeve (14) is a conical table structure, and the sealing sleeve (14) is in sealing abutment with the lower limiting slope table (13) through the conical surface thereof.

5. The delayed kick shut-off spool valve core of claim 1 wherein, The shell (1) is fixed with a filter cover (18) outside the liquid inlet (3).

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