A self-operated piston valve

Abstract

The present invention discloses a self-operated piston valve, comprising: a valve body, the valve body is provided with an inlet end and an outlet end, the inlet end is provided with a flow guide; a piston body is installed in the valve body, the end face of the piston body close to the inlet end is used to cooperate with the flow guide to realize valve closing; a spring is installed between the end face of the outlet end of the piston body and the valve body; the spring is used to push the piston body to move toward the flow guide; the valve body and the end face of the piston body close to the outlet end constitute a pressure chamber; the pressure chamber is communicated with the inlet end through a connecting hole provided on the piston body, and the valve body is provided with an external connection hole extending to the pressure chamber. The self-operated piston valve disclosed by the present invention uses the medium pressure in the valve body as a driving force, controls the pressure in the pressure chamber through the external connection hole and the connecting hole communicated with the pressure chamber, thereby driving the piston body to move axially in the valve body to realize the opening and closing of the valve. The structure is simple and lightweight, maintenance is simple, and the configuration of the external connection hole can be flexibly selected.

Description

Technical Field

[0001] The invention relates to a hydraulic control valve, in particular to a self-operated piston valve. Background Art

[0002] At present, hydraulic control valves use pipeline medium pressure as power to open, close and adjust the valve. There are two types: diaphragm type and piston type. They have the same working principle. They all use the upstream and downstream pressure difference as power to make the diaphragm or piston open, close or adjust the valve disc according to the differential principle in hydraulic pressure. The main valve body is a Y-type, T-type or other cut-off type. The valve structure is complex and large in size, which is not conducive to miniaturization and convenient application. Due to the tortuosity of its flow channel, the adjustment performance is poor, especially not suitable for high pressure difference conditions.

[0003] At the same time, the piston valve (also known as the flow and pressure regulating valve), which is widely used at present, has good flow and pressure regulating performance due to its unique annular channel, balanced valve core and other characteristics, avoiding the poor regulating performance of butterfly valves, gate valves and other problems such as cavitation and noise that can be caused. It can be used in high pressure difference conditions and is widely used in flow control and pressure regulation of pipelines. However, the current piston valves are driven by external forces, such as Chinese patents 201610256810.2 and 201420239851.7, and their opening and closing parts are driven by a crank-connecting rod mechanism, and the valve is opened and closed by axial movement in the front and rear directions. The crank is driven by the valve shaft driven by external force. The current conventional power is an electric device, which makes the product's application conditions and subsequent operation and maintenance have great limitations and troubles. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a self-operated piston valve, which has the advantages of small size, light weight, simple structure, convenient later maintenance, and can control the valve by means of medium pressure.

[0005] A self-acting piston valve according to an embodiment of the first aspect of the present invention comprises: a valve body, the valve body being provided with an inlet end and an outlet end, the inlet end being provided with a flow guide; a piston body being installed in the valve body, the end face of the piston body close to the inlet end being used to cooperate with the flow guide to separate the inlet end from the outlet end; a spring being installed between the end face of the outlet end of the piston body and the valve body, the spring being used to push the piston body to move toward the flow guide; the valve body and the end face of the piston body close to the outlet end forming a pressure chamber; the pressure chamber is connected to the inlet end via a connecting hole provided on the piston body, and the valve body is provided with a External connection hole; the valve body comprises a main valve body and a sub-valve body; the main valve body and the sub-valve body are detachably connected; the piston body comprises a first cylindrical section and a second cylindrical section, the diameter of the first cylindrical section is larger than that of the second cylindrical section, and the first cylindrical section and the second cylindrical section are coaxially connected and the first cylindrical section is closer to the outlet end than the second cylindrical section; the outer circle of the first cylindrical section and the outer circle of the second cylindrical section are both sealed with the main valve body and can move along it, and the inner circle of the piston body is sealed with the sub-valve body; the valve body, the end face of the first cylindrical section close to the inlet end and the outer circle of the second cylindrical section constitute an air cavity, and the valve body is provided with an air vent extending from the outer wall to the air cavity.

[0006] A self-operated piston valve according to an embodiment of the present invention has at least the following technical effects: using the medium pressure in the valve body as the driving force, the pressure in the pressure chamber is controlled by the external hole and the connecting hole, thereby driving the piston body to overcome the spring pressure and move axially in the valve body to realize the opening and closing of the valve. There is no need to use a high-voltage electric drive device, the structure is simple and lightweight, and subsequent maintenance is convenient. The configuration of the external hole can be flexibly selected according to functional requirements, actual installation and application conditions, and control accuracy requirements. For example, the external hole is connected by a solenoid valve, a mechanical pilot valve, a manual ball valve, etc. to realize functions such as electronic control, pressure relief, flow regulation, water level control, and cutoff.

[0007] According to some embodiments of the present invention, a first sealing ring is installed at the position where the guide body contacts the piston body.

[0008] According to some embodiments of the present invention, the first sealing ring is fixed on the body guide through a sealing pressure plate.

[0009] According to some embodiments of the present invention, a flow guide tube is installed on one side of the flow guide body close to the outlet end; the axis of the flow guide tube is parallel to the moving direction of the piston body, and the flow guide tube is provided with a plurality of flow holes penetrating its peripheral wall.

[0010] According to some embodiments of the present invention, the piston body is provided with a second groove corresponding to the spring for embedding one end thereof, and the valve body is provided with a first groove corresponding to the spring for embedding the other end thereof.

[0011] According to some embodiments of the present invention, the flow guide is fixed at the center of the inlet end by supporting ribs.

[0012] According to some embodiments of the present invention, a third groove corresponding to the external connection hole is formed on the end surface of the piston body close to the outlet end.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 is a schematic structural diagram of a valve in a closed state according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the valve when it is opened in the embodiment of the present invention;

[0017] Figure 3 is a schematic diagram of installing a guide tube according to an embodiment of the present invention;

[0018] Figure 4 Schematic diagram of a waist-shaped groove guide tube according to an embodiment of the present invention;

[0019] Figure 5 Schematic diagram of a V-shaped guide tube according to an embodiment of the present invention;

[0020] Figure 6 It is a schematic diagram of a spray hole guide tube according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] Auxiliary valve body 100, external connection hole 110, spring 120, first groove 130, outlet end 140, sealing section 150, valve body 111;

[0023] The main valve body 200, the support rib 210, the guide body 220, the first sealing ring 230, the sealing pressure plate 240, the guide tube 250, the flow hole 260, the sealing pressure block 270, the vent hole 280, and the inlet end 290;

[0024] The piston body 300, the communicating hole 310, the first cylindrical section 320, the second cylindrical section 330, the third groove 340, and the second groove 350;

[0025] Pressure chamber 400 and air chamber 410 . DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1 , Figure 2 As shown, a self-operated piston valve according to an embodiment of the present invention comprises a valve body 111 having an inlet end 290 and an outlet end 140, and a piston body 300 is installed in the valve body 111.

[0030] The inlet end 290 is provided with a guide body 220, the axial center line of the guide body 220 coincides with the axial center line of the valve body 111, and a spring 120 is installed between the end face of the piston body 300 close to the outlet end 140 and the valve body 111. The spring 120 pushes the piston body 300 to move toward the guide body 220 to prevent stagnation, and assists the sealing of the valve when the valve is closed. When the piston body 300 moves toward the outlet end 140 and separates from the guide body 220, the valve is in an open and conductive state. At this time, the fluid medium passes through the channel between the piston body 300 and the guide body 220 after being diverted by the guide body 220, and flows out from the outlet end 140. When the end face of the piston body 300 close to the inlet end 290 contacts the guide body 220, the valve is closed. The valve body 111 and the end surface of the piston body 300 near the outlet end 140 form a pressure chamber 400. A connecting hole 310 is opened on the piston body 300. The pressure chamber 400 communicates with the inlet end 290 through the connecting hole 310. The valve body 111 is provided with an external hole 110 extending to the pressure chamber 400. The pressure of the pressure chamber 400, the elastic force of the spring 120 and the pressure of the medium at the inlet end 290 jointly control the movement of the piston body 300. The pressure in the pressure chamber 400 can be controlled by the opening and closing state of the external hole 110. The valve body 111 includes a main valve body 200 and a sub-valve body 100; the main valve body 200 and the sub-valve body 100 are connected by a detachable connection, such as a flange connection, a threaded connection, etc., to facilitate manufacturing and maintenance. The piston body 300 includes a first cylindrical section 320 and a second cylindrical section 330. The diameter of the first cylindrical section 320 is larger than that of the second cylindrical section 330. The first cylindrical section 320 and the second cylindrical section 330 are coaxially connected. The first cylindrical section 320 is closer to the outlet end 140 relative to the second cylindrical section 330. The outer circle of the first cylindrical section 320 is sealed with the main valve body 200 and can move along it. The outer circle of the second cylindrical section 330 is sealed with the main valve body 200 and can move along it. The auxiliary valve body 100 extends to the side of the inlet end 290 with a sealing section 150. The inner circle of the piston body 300 is sealed with the sealing section 150 and can move along it. The sealing is in the form of a sealing ring to ensure that the piston body 300 can slide smoothly and prevent medium leakage. The valve body 111, the end surface of the first cylindrical section 320 close to the inlet end 290 and the outer circle of the second cylindrical section 330 form an air cavity 410. The valve body 111 is provided with a vent hole 280 extending from the outer wall to the air cavity 410. The air cavity 410 can maintain a pressure equal to the atmospheric pressure during the movement of the piston body 300, thereby achieving pressure stabilization and avoiding affecting the movement of the piston body 300.

[0031] In the self-operated piston valve provided by the present invention, the flowing medium collides and dissipates energy in the middle cavity of the valve body, and has the characteristics of small piston valve cavitation, low noise, and stable operation. In particular, the structure of the self-operated valve is adopted, and the piston body is driven by the medium pressure in the pipeline network. Only the pressure difference on both sides of the piston body needs to be controlled to control the opening, closing and regulation of the main valve, thereby avoiding the defects of the current piston valve that requires external force to drive and strong electricity to operate. At the same time, the main valve adopts axial flow type, which is significantly reduced in volume and weight compared with the existing Y-type, T-type and other cut-off hydraulic valves, realizing the miniaturization and convenience of the valve, and breaking through its caliber limitation to develop large-caliber products.

[0032] In some specific embodiments of the present invention, a first sealing ring 230 is installed at the position where the flow guide 220 contacts the piston body 300, so that the inlet end 290 and the outlet end 140 can be completely isolated when the valve is closed.

[0033] In some specific embodiments of the present invention, the first sealing ring 230 is fixed on the body-guiding element 220 via a sealing pressure plate 240 to prevent the first sealing ring 230 from being washed off by water.

[0034] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, in some specific embodiments of the present invention, a flow guide tube 250 is installed on the side of the flow guide body 220 close to the outlet end 140; the axis of the flow guide tube 250 is parallel to the moving direction of the piston body 300, and the flow guide tube 250 is provided with a sealing block 270 at a position close to the flow guide body 220, and the sealing block 270 is connected to the flow guide body 220 by screws for fixing the first sealing ring 230. The flow guide tube 250 is provided with a plurality of flow holes 260 penetrating its peripheral wall. The flow holes 260 can be in the form of, but not limited to, V-shaped holes, waist grooves, and spray holes according to the pressure difference. In the case where the pressure difference between the inlet end 290 and the outlet end 140 is too large, the medium can be decompressed and dissipated through the flow holes 260 on the flow guide tube 250 and the water hammer phenomenon during the opening and closing of the valve can be eliminated.

[0035] In some specific embodiments of the present invention, the piston body 300 is provided with a first groove 130 corresponding to the spring 120 for embedding one end thereof, and the valve body 111 is provided with a second groove 350 corresponding to the spring 120 for embedding the other end thereof, and the groove is used to fix the position of the spring 120.

[0036] In some specific embodiments of the present invention, the flow guide 220 is fixed at the center of the inlet end 290 by the support rib 210. The flow guide 220 can prevent the medium from directly scouring the valve body 111 and the piston body 300, thereby reducing the wear of the flow-through components. The flow guide 220 is a hollow cone protruding toward the inlet end 290. The use of this special shape to divert the medium can reduce the flow loss of the valve.

[0037] In some specific embodiments of the present invention, a third groove 340 corresponding to the external hole 110 is opened on the end surface of the piston body 300 near the outlet end 140. When the piston body 300 moves close to the outlet end 140, the external hole 110 and the pressure chamber 400 are connected through the third groove 340.

[0038] The working principle of the self-operated piston valve as a regulating valve is as follows: Figure 2 As shown, the outer diameter D2 and the inner diameter D3 of the small cross-section end of the piston body 300 form an annular area A1, the outer diameter D1 and the inner diameter D3 of the large cross-section end of the piston body 300 form an annular area A2, and the elastic force of the spring 120 is F. The pressure at the inlet end 290 is P1, and the pressure chamber 400 is connected to the valve outlet end 140 or the outside through the external connection hole 110, and the pressure P2 is formed by controlling the components on the connecting pipeline.

[0039] When P1×A1>P2×A2+F, the piston body 300 moves to the left until it is fully opened;

[0040] When P1×A1<P2×A2+F, the piston body 300 moves to the right until it is fully closed;

[0041] When P1×A1=P2×A2+F, the piston body 300 is in a left-right balanced adjustment state.

[0042] The self-operated piston valve using the above technical solution only needs to control the pressure of P2 to rely on hydraulic drive to open, close and adjust the valve. There are various ways to control the P2 pressure, such as using solenoid valves, mechanical pilot valves, manual ball valves, etc. to achieve electronic control, flow regulation, water level control and other functions. The configuration of the control end can be flexibly selected according to functional requirements, actual installation and application conditions, and control accuracy requirements.

[0043] The working principle of the self-operated piston valve as a shut-off valve is as follows: the flow area of ​​the connecting hole 310 is smaller than the flow area of ​​the external hole 110. When the external hole 110 is in a closed state, the pressure chamber 400 is connected to the inlet end 290 through the connecting hole 310, so that the pressure of the pressure chamber 400 is equal to that of the inlet end 290, that is, P2 = P1. At this time, P2×A2+F>P1×A1, and the valve is closed. When the external hole 110 is fully conductive, the connecting hole 310 will make up for the deficiency, causing the pressure chamber 400 to lose pressure, P2<P1, and when P2×A2+F is less than P1×A1, the valve is opened.

[0044] It is foreseeable that, in some embodiments, one or more external holes 110 may be provided to achieve the purpose of multi-path control of the pressure of the pressure chamber 400 .

[0045] It is understandable that, in some embodiments, one or more vent holes 280 may be provided, which can also achieve the purpose of maintaining the pressure of the air cavity 410 equal to the atmospheric pressure and preventing the movement of the piston body 300 from being hindered.

[0046] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0047] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A self-operated piston valve, characterized in that: include: A valve body (111), wherein the valve body (111) is provided with an inlet end (290) and an outlet end (140), and the inlet end (290) is provided with a flow guide (220); A piston body (300) is installed in the valve body (111); an end surface of the piston body (300) close to the inlet end (290) is used to cooperate with the flow guide (220) to achieve the isolation of the inlet end (290) and the outlet end (140); a spring (120) is installed between the end surface of the piston body (300) close to the outlet end (140) and the valve body (111); the spring (120) is used to push the piston body (300) to move toward the flow guide (220); the end surface of the piston body (300) close to the outlet end (140) and the valve body (111) form a pressure chamber (400); The pressure chamber (400) is communicated with the inlet end (290) via a connecting hole (310) provided on the piston body (300); the valve body (111) is provided with an external connection hole (110) extending to the pressure chamber (400); the valve body (111) comprises a main valve body (200) and an auxiliary valve body (100); the main valve body (200) and the auxiliary valve body (100) are detachably connected; the piston body (300) comprises a first cylindrical section (320) and a second cylindrical section (330); the diameter of the first cylindrical section (320) is larger than that of the second cylindrical section (330), and the first cylindrical section (320) and the second cylindrical section (330) are detachably connected. 0) are coaxially connected and the first cylindrical section (320) is closer to the outlet end (140) than the second cylindrical section (330); the outer circle of the first cylindrical section (320) and the outer circle of the second cylindrical section (330) are both sealed and matched with the main valve body (200) and can move along the main valve body (200), and the inner circle of the piston body (300) is sealed and matched with the auxiliary valve body (100); the valve body (111), the end surface of the first cylindrical section (320) close to the inlet end (290) and the outer circle of the second cylindrical section (330) form an air cavity (410), and the valve body (111) is provided with a vent hole (280) extending from the outer wall to the air cavity (410).

2. A self-operated piston valve according to claim 1, characterized in that: A first sealing ring (230) is installed at the position where the guide body (220) contacts the piston body (300).

3. A self-operated piston valve according to claim 2, characterized in that: The first sealing ring (230) is fixed on the flow guide (220) via a sealing pressure plate (240).

4. A self-operated piston valve according to claim 1, characterized in that: A flow guide tube (250) is installed on one side of the flow guide body (220) close to the outlet end (140); the axis of the flow guide tube (250) is parallel to the moving direction of the piston body (300), and the flow guide tube (250) is provided with a plurality of flow holes (260) penetrating the peripheral wall thereof.

5. A self-operated piston valve according to claim 1, characterized in that: The piston body (300) is provided with a second groove (350) corresponding to the spring (120) for one end thereof to be embedded, and the valve body (111) is provided with a first groove (130) corresponding to the spring (120) for the other end thereof to be embedded.

6. A self-operated piston valve according to claim 1, characterized in that: The flow guide (220) is fixed at the center of the inlet end (290) by a support rib (210).

7. A self-operated piston valve according to claim 1, characterized in that: A third groove (340) corresponding to the external connection hole (110) is formed on the end surface of the piston body (300) close to the outlet end (140).

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