A switch valve with waterproof function

Abstract

The present invention discloses a switch valve with anti-water hammer function, including a valve seat, a valve core rod and a valve core seal. One, two or three of the valve seat, the valve core rod and the valve core seal are provided with anti-water hammer components. The anti-water hammer components include a pressure sensing hole and a hollow rubber O-ring. One end of the pressure sensing hole is connected to the valve cavity, and the other end points to the hollow rubber O-ring, so that the medium entering the valve cavity contacts the hollow rubber O-ring; the hollow rubber O-ring is a rubber part with an annular structure, and there is a closed compressible cavity inside the rubber part that is not connected to the external environment. The present invention can effectively reduce the water hammer pressure generated by the switch valve itself during the rapid disconnection process without affecting the original function of the switch and without increasing the weight of the valve itself. During the water hammer pressure oscillation process, the hollow rubber O-ring can form pressure fluctuation damping by inducing the pressure change of the liquid medium to produce deformation or restore deformation, thereby effectively suppressing the water hammer pressure.

Description

Technical Field

[0001] The invention belongs to the technical fields of aerospace, chemical industry and the like, and in particular is a switch valve with a water-surge-proof function. Background Art

[0002] In the fluid circuit system of aerospace products, the switching valves in the pipeline will form water hammer during the rapid opening and closing process. Especially for systems with rapid response requirements for the switching machine, the water hammer phenomenon is particularly obvious, which may cause serious accidents such as rupture of the fluid circuit system pipeline and damage to the valve.

[0003] For a specific hydraulic system, without extending the valve on / off response time, most of the existing measures to deal with water hammer hazards adopt the following methods:

[0004] ① Increase the design margin (such as pipe diameter, strength, etc.) of pipelines, valves and related components to ensure that the liquid system can withstand water hammer pressure without being damaged. This measure can easily cause the weight and volume of pipelines, valves, related components and other products to exceed the given index requirements.

[0005] ② Adding energy storage buffer devices. Adding energy storage buffer devices to the fluid system can reduce the water hammer pressure in the pipeline, but it will complicate the structure and layout of the fluid system, greatly increasing the system design, manufacturing and testing costs.

[0006] On the other hand, affected by the installation position of the energy storage buffer device, the energy storage buffer device may not be able to reduce the maximum water hammer pressure acting on the valve switch, and cannot effectively protect the valve that executes the command action. Summary of the invention

[0007] In order to solve the above problems, the present invention aims to provide a switch valve with water hammer resistance, which can effectively reduce the water hammer pressure generated by the switch valve itself during the rapid opening and closing process without affecting its original switch function and increasing the weight of the valve itself.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A switch valve with anti-water hammer function, comprising:

[0010] A valve seat, the valve seat comprising an inlet, an outlet and a valve cavity;

[0011] A valve core rod, wherein the valve core rod is slidably connected in the valve cavity, and the sliding direction of the valve core rod points to the outlet of the valve seat;

[0012] A valve core seal, wherein the valve core seal is arranged on the end surface of the valve core rod and the valve core seal points to the outlet of the valve seat;

[0013] One, two or three of the valve seat, valve core rod and valve core seal are provided with a water-proof component, and the water-proof component includes a pressure sensing hole and a hollow rubber O-ring, wherein:

[0014] One end of the pressure sensing hole is connected to the valve cavity, and the other end points to the hollow rubber O-ring, so that the medium entering the valve cavity comes into contact with the hollow rubber O-ring;

[0015] The hollow rubber O-ring is a rubber part with an annular structure, and the inside of the rubber part has a closed compressible cavity which is not connected with the external environment.

[0016] It should be pointed out that the position, quantity and size of the hollow rubber O-ring are not limited and can be designed or changed according to actual conditions. As long as the hollow rubber O-ring is located upstream from the inlet of the switch valve to the valve core closing position (i.e., the sealing surface formed when the valve core seal and the valve lip are closed), the effect is best. The upstream here refers to the space area where the medium flows from the inlet of the switch valve to the outlet of the switch valve (for example, Figure 5 In the figure, the outer periphery of the valve lip at the valve seat outlet toward the inner wall also belongs to this space area, that is, upstream of the valve core closing point).

[0017] As an option, a ring-shaped seating groove is provided on the inner wall circumferentially of the outlet of the valve seat, and the hollow rubber O-ring is placed in the seating groove. The cross-sectional area of ​​the seating groove is sufficient to allow the hollow rubber O-ring to remain free and undeformed when not affected by the medium from the valve cavity. The seating groove is connected to the valve cavity via a pressure sensing hole machined on the inner wall of the valve cavity.

[0018] Furthermore, the valve seat also includes a valve lip, which is located on the circumferential outside of the valve seat outlet. The valve lip is a frustum structure with the outlet as the central axis. The mounting groove and the pressure sensing hole are both arranged on the inner wall of the valve cavity on the circumferential outside of the valve lip.

[0019] As an option, a circle of annular seating groove is provided on the valve core rod and on the end face of one side where the valve core seal is provided, the seating groove does not intersect with the valve core seal, the hollow rubber O-ring is placed in the seating groove, the cross-sectional area of ​​the seating groove is sufficient to keep the hollow rubber O-ring free and undeformed when not affected by the medium from the valve cavity, and the seating groove is connected to the valve cavity through a pressure sensing hole machined on the end face of the valve core rod.

[0020] As an option, the valve core seal is provided with an annular seating groove, the hollow rubber O-ring is placed in the seating groove, the cross-sectional area of ​​the seating groove is sufficient to allow the hollow rubber O-ring to remain free and undeformed when not affected by the medium from the valve cavity, and the seating groove is connected to the valve cavity via a pressure sensing hole machined on the end face of the valve core rod.

[0021] Furthermore, the cross-sectional wall thickness and cavity inner diameter of the hollow rubber O-ring meet the following conditions:

[0022] The higher the rated working pressure of the switch valve, the thicker the cross-sectional wall of the hollow rubber O-ring;

[0023] The larger the rated flow of the on-off valve or the longer the system pipeline where the on-off valve is located, the larger the inner diameter of the hollow rubber O-ring cavity.

[0024] Furthermore, the cross-sectional shape of the hollow rubber O-ring is circular or rectangular.

[0025] Furthermore, the pressure sensing hole is a round hole or a waist-shaped hole, and the maximum hole diameter or opening width of the pressure sensing hole is smaller than the wire diameter of the hollow rubber O-ring.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] (1) Since the hollow rubber O-ring has a hollow structure, and the mounting groove and the pressure sensing hole are structures in which materials are removed from the valve body structure, the weight of the valve is not increased but reduced, thus solving the water hammer problem without increasing the weight of the valve.

[0028] (2) The hollow rubber O-ring, mounting groove and pressure sensing hole are all set on the original structure of the valve (the inner wall of the valve seat, the valve core rod and the valve core seal), which will not change the original function and volume of the valve.

[0029] (3) According to actual needs (valve working pressure and flow), hollow rubber O-rings, mounting grooves and pressure sensing holes can be optionally arranged at one, two or three locations on the inner wall of the valve seat, the valve core rod and the valve core seal to eliminate the water hammer phenomenon.

[0030] (4) The hollow rubber O-ring always keeps in contact with the medium in the valve cavity through the pressure sensing hole, so as to utilize the deformation process of the hollow rubber O-ring (including the compression deformation process and the elastic recovery process) to suppress the positive water hammer pressure and the negative water hammer pressure. The hollow rubber O-ring can generate deformation or restore deformation by sensing the pressure change of the liquid medium to form pressure fluctuation damping, thereby effectively suppressing the water hammer pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1A schematic diagram of a switch valve with a water-surge protection function in the present invention;

[0032] Figure 2 This is the structural diagram of the hollow rubber O-ring;

[0033] Figure 3 for Figure 2 Cross-section of a hollow rubber O-ring;

[0034] Figure 4 It is a schematic diagram of the deformation process of the hollow rubber O-ring when the hollow O-ring is set in the valve core seal and the valve is closed;

[0035] Figure 5 It is a schematic diagram of the deformation process of a hollow rubber O-ring when the hollow O-ring is arranged on the circumferential inner wall of the valve seat outlet and the valve is closed;

[0036] In the figure, 1-valve core rod; 2-valve seat; 3-valve core seal; 4-hollow rubber O-ring; 5-pressure sensing hole; 6-valve lip; 7-mounting groove; 8-other related parts and components. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter described in the present invention is limited to the following embodiments. Without departing from the above-mentioned technical ideas of the present invention, various modifications, substitutions and changes made according to the common technical knowledge and customary means in the field are included in the scope of the present invention.

[0038] like Figure 1 to Figure 3 As shown, a switch valve with anti-water hammer function is shown, which is mainly composed of a valve core rod 1, a valve seat 2, a valve core seal 3, a hollow rubber O-ring 4, a pressure sensing hole 5, a placement groove 7 and other related parts and components 8, wherein the hollow rubber O-ring 4 is assembled in the placement groove 7, and the placement groove 7 is connected with the valve inner space through the pressure sensing hole 5 to ensure that the pressure of the liquid medium in the valve cavity can act on the hollow rubber O-ring 4. The valve seat 2 is provided with an inlet and an outlet, the inlet is located at the side end of the valve seat 2, and the outlet is located at the lower end of the valve seat 2, the valve core rod 1 is vertically slidably connected in the valve cavity of the valve seat 2, and a truncated cone-shaped valve lip 6 structure is provided on the outer circumference of the outlet.

[0039] The hollow rubber O-ring 4 is a rubber O-ring with a hollow interior and the ability to recover elastic deformation. Figure 2 and Figure 3 As shown, the internal cavity is a fully enclosed structure and is not connected to the outside.

[0040] The hollow rubber O-ring 4 can be made of different materials and sizes according to the valve working medium, pressure and other parameters. The higher the rated working pressure of the system where the switch valve is located, the thicker the cross-sectional wall of the hollow rubber O-ring 4 selected; the larger the rated flow of the valve or the longer the system pipeline, the larger the inner diameter of the hollow rubber O-ring 4 selected.

[0041] The cross section of the hollow rubber O-ring 4 can be a ring cross section, a rectangular cross section or other cross section forms with an internal closed compressible space.

[0042] The hollow rubber O-ring 4 is located upstream of the inlet of the switch valve to the valve core closing point (i.e., the sealing surface formed when the valve core seal 3 and the valve lip 6 are closed) for the best effect. It should be noted that the upstream here refers to the space area where the medium flows from the inlet to the outlet (for example, Figure 5 In the figure, the outer circumference of the valve lip 6 at the outlet of the valve seat 2 also belongs to the space area, that is, upstream of the valve core closing position). If a hollow rubber O-ring 4 is set in the upstream pipeline of the inlet of the switch valve, the waterproof effect is worse; if the hollow rubber O-ring 4 is located downstream of the valve core closing position (that is, the sealing surface formed when the valve core seal 3 and the valve lip 6 are closed is the starting point, and extends to the outlet of the switch valve), there is no waterproof effect.

[0043] The placement groove 7 and the pressure sensing hole 5 are located outside the valve lip 6 and can be arranged on the valve core seal 3, the valve core rod 1, the valve seat 2 or the relevant structure of the valve cavity, such as Figure 4 , Figure 5 As shown, Figure 4 A solution in which the placement groove 7 and the hollow rubber O-ring 4 are arranged in the valve core seal 3, and the pressure sensing hole 5 is arranged on the valve core rod 1; Figure 5 The solution is that the placement groove 7, the pressure sensing hole 5 and the hollow rubber O-ring 4 are all arranged in the inner wall of the outer circumference of the valve lip 6 at the outlet of the valve seat 2.

[0044] The placement groove 7 is used to fix the hollow rubber O-ring 4 to ensure that the hollow rubber O-ring 4 does not fall off due to pressure fluctuations. When not squeezed by external medium pressure, the hollow rubber O-ring 4 is in a free and non-deformed state in the placement groove 7.

[0045] The maximum aperture or opening width of the pressure sensing hole 5 should be smaller than the wire diameter of the hollow rubber O-ring 4 to ensure that the hollow rubber O-ring 4 will not be squeezed out of the placement groove 7. The cross section of the pressure sensing hole 5 can be a round hole, a waist-shaped hole or other structural forms.

[0046] When the valve is opened or is at the rated working pressure after opening, the hollow rubber O-ring 4 does not deform. Figure 4 (a) Figure 5(a) When the valve is suddenly closed and positive water hammer occurs, the increasing pressure of the liquid medium in the valve will squeeze the hollow rubber O-ring 4 through the pressure sensing hole, causing it to continuously deform; at this time, the cavity of the hollow rubber O-ring 4 is gradually compressed, as shown in FIG. Figure 4 (b) Figure 5 As shown in (b), the external proportional volume gradually decreases, the compression trend of the liquid medium in the valve is eliminated, and the positive water hammer pressure is suppressed. The greater the initial water hammer pressure, the greater the deformation of the hollow rubber O-ring 4, and the more obvious the water hammer suppression effect. When negative water hammer pressure appears in the liquid medium in the pipeline, the compressed hollow rubber O-ring 4 returns to its original initial state, the external proportional volume increases, the downward trend of the liquid medium pressure in the valve is eliminated, and the negative water hammer pressure is suppressed. During the water hammer pressure oscillation process, the hollow rubber O-ring 4 can form pressure fluctuation damping by sensing the change in the pressure of the liquid medium and generating deformation or restoring deformation, thereby effectively suppressing the water hammer pressure. Relative Figure 4 (b) Figure 5 (b) The hollow rubber O-ring 4 is compressed and deformed, Figure 4 (c) Figure 5 (c) shows the hollow rubber O-ring 4 returning to a free state after suppressing the water hammer pressure.

Claims

1. A switch valve with anti-water hammer function, characterized in that: include, A valve seat (2), the valve seat (2) comprising an inlet, an outlet and a valve cavity; A valve core rod (1), the valve core rod (1) being slidably connected in the valve cavity, and the sliding direction of the valve core rod (1) pointing to the outlet of the valve seat (2); A valve core seal (3), wherein the valve core seal (3) is arranged on an end surface of the valve core rod (1), and the valve core seal (3) points toward an outlet of the valve seat (2); The valve seat (2) is provided with a water-proof component, or the valve seat (2) and the valve core rod (1) are provided with water-proof components at the same time, or the valve seat (2), the valve core rod (1) and the valve core seal (3) are provided with water-proof components at the same time, and the water-proof component comprises a pressure sensing hole (5) and a hollow rubber O-ring (4), wherein: One end of the pressure sensing hole (5) is connected to the valve cavity, and the other end points to the hollow rubber O-ring (4), so that the medium entering the valve cavity comes into contact with the hollow rubber O-ring (4); The hollow rubber O-ring (4) is a rubber part with an annular structure, and the inside of the rubber part has a closed compressible cavity that is not connected to the external environment; The outlet circumferential inner wall of the valve seat (2) is provided with an annular seating groove (7), the hollow rubber O-ring (4) is placed in the seating groove (7), the cross-sectional area of ​​the seating groove (7) is sufficient to keep the hollow rubber O-ring (4) in a free and non-deformed state when not affected by the medium in the valve cavity, and the seating groove (7) is connected to the valve cavity via a pressure sensing hole (5) machined on the inner wall of the valve cavity; The valve seat (2) further comprises a valve lip (6), which is located on the circumferential outer side of the valve seat (2) outlet. The valve lip (6) is a frustum structure with the outlet as the central axis. The placement groove (7) and the pressure sensing hole (5) are both arranged on the inner wall of the valve cavity on the circumferential outer side of the valve lip (6).

2. The switch valve with anti-water hammer function according to claim 1, characterized in that: The valve core rod (1) is provided with an annular seating groove (7) on one side end face on which the valve core seal (3) is provided. The seating groove (7) does not intersect with the valve core seal (3). The hollow rubber O-ring (4) is placed in the seating groove (7). The cross-sectional area of ​​the seating groove (7) is sufficient to allow the hollow rubber O-ring (4) to remain in a free and non-deformed state when not affected by the medium in the valve cavity. The seating groove (7) is connected to the valve cavity via a pressure sensing hole (5) machined on the end face of the valve core rod (1).

3. The switch valve with anti-water hammer function according to claim 1, characterized in that: The valve core seal (3) is provided with an annular seating groove (7), and the hollow rubber O-ring (4) is placed in the seating groove (7). The cross-sectional area of ​​the seating groove (7) is sufficient to allow the hollow rubber O-ring (4) to remain in a free and non-deformed state when not affected by the medium in the valve cavity. The seating groove (7) is connected to the valve cavity via a pressure sensing hole (5) machined on the end surface of the valve core rod (1).

4. A switch valve with waterproof function according to any one of claims 1, 2 or 3, characterized in that: The cross-sectional wall thickness and cavity inner diameter of the hollow rubber O-ring (4) meet the following conditions: The higher the rated working pressure of the switch valve, the thicker the cross-sectional wall of the hollow rubber O-ring (4); The larger the rated flow rate of the on-off valve or the longer the system pipeline in which the on-off valve is located, the larger the inner diameter of the hollow rubber O-ring (4) is.

5. A switch valve with waterproof function according to any one of claims 1, 2 or 3, characterized in that: The cross-sectional shape of the hollow rubber O-ring (4) is circular or rectangular.

6. A switch valve with waterproof function according to any one of claims 1, 2 or 3, characterized in that: The pressure sensing hole (5) is a round hole or a waist-shaped hole, and the maximum hole diameter or opening width of the pressure sensing hole (5) is smaller than the wire diameter of the hollow rubber O-ring (4).

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