Piston structure for preventing connecting pin from falling off and flow and pressure regulating valve using piston structure

Abstract

The invention provides a piston structure for preventing a connecting pin from falling off, which is used for opening a flow and pressure regulating valve and is characterized in that the piston structure is mounted on a piston frame, the piston frame is connected with a connecting rod through a connecting rod pin, the connecting rod can drive the piston structure to move, and the piston structure is provided with a blocking part; the blocking part can limit the two ends of the connecting rod pin and prevent the connecting rod pin from falling off from the connecting rod. The invention provides a scheme for limiting the connecting rod pin, so that the connecting rod pin can be stably connected with the connecting rod and is prevented from falling off.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of flow and pressure regulating valves, and particularly relates to a piston structure for preventing a connecting pin from falling off and a flow and pressure regulating valve using the same. BACKGROUND

[0002] The piston type flow and pressure regulating valve is a key fluid control device widely used in the fields of water conservancy and hydropower, municipal water supply and drainage, and industrial circulating water systems. The core function thereof is to realize continuous regulation and stabilization of the flow and pressure of the medium in the pipeline by accurately controlling the opening of the piston in the valve, and the valve has a shut-off function. The valve plays a crucial role in ensuring the safety of the pipeline network, eliminating cavitation, saving energy and reducing consumption, and realizing automatic control of the system. The connecting rod and the piston frame are connected through a connecting rod pin. The traditional anti-falling method of the connecting rod pin is to use a split pin or a nut for fixation. The connecting point is better than the flow channel and is impacted by the water flow. The connecting rod pin vibrates, and the split pin or the nut is easy to fall off, which causes the connecting rod pin to fall out, the driving device cannot drive the piston to move, and the valve fails, which will face serious water supply problems. SUMMARY

[0003] Therefore, the application aims to provide a piston structure for preventing a connecting pin from falling off and a flow and pressure regulating valve using the same, so as to ensure that the connecting rod pin can be stably connected with the connecting rod.

[0004] To achieve the above-mentioned purpose, the technical scheme of the application is as follows: A piston structure for preventing a connecting pin from falling off is used to realize the opening of a flow and pressure regulating valve. The piston structure is installed to a piston frame. The piston frame is connected with a connecting rod through a connecting rod pin. The connecting rod can drive the piston mechanism to move. The piston structure is provided with a blocking part. The blocking part can limit the two ends of the connecting rod pin to prevent the connecting rod pin from falling off the connecting rod.

[0005] Further, the piston structure comprises a first piston body and a second piston body. The blocking part comprises a first blocking part and a second blocking part. The first piston body comprises a first flange plate, a first flow guide cover and a first blocking part. The first flow guide cover is provided with a plurality of flow guide holes on the surface thereof. The end surface of the first flow guide cover is installed to the surface of the first flange plate to form an integrated structure. The circumferential inner surface of the first flange plate is provided with two first blocking parts.

[0006] Further, the first blocking part comprises a blocking rod and a blocking block. The blocking block is installed to the blocking rod to form an L-shaped long rod. The blocking block is used to block and limit the connecting rod pin.

[0007] Further, the second piston body comprises a second flange plate, a second fairing and a second blocking part, the end face of the second fairing is mounted to the surface of the second flange plate to form an integrated structure, and the second blocking part is arranged at the center of the second flange plate and used for connecting with the piston frame.

[0008] Further, the second blocking part is in a circular shape and used for blocking and limiting the connecting rod pin.

[0009] The flow pressure regulating valve uses the piston structure for preventing the connecting pin from falling off, and comprises a first flow pressure regulating valve and a second flow pressure regulating valve. The first flow pressure regulating valve comprises a first piston body, a first piston frame, a guide piston, a connecting rod driving assembly, a flow guide barrel and a valve body. The flow guide barrel and the connecting rod driving assembly are arranged in the valve body, the guide piston is sleeved to the flow guide barrel, and the first piston body is connected with the guide piston through the first piston frame. The first piston frame is provided with two parallel connecting plates, the connecting rod of the connecting rod driving assembly is arranged between the two connecting plates, the connecting rod pin passes through the connecting plates and the connecting rod to realize the connection between the connecting rod and the first piston frame. The first blocking part of the first piston body is used for blocking and limiting two ends of the connecting rod pin.

[0010] Further, the second flow pressure regulating valve comprises a second piston body, a second piston frame, a guide piston, a connecting rod driving assembly, a flow guide barrel and a valve body. The flow guide barrel and the connecting rod driving assembly are arranged in the valve body, the guide piston is sleeved to the flow guide barrel, and the second piston body is connected with the guide piston through the second piston frame. The second piston frame is provided with a connecting ring at the center, the connecting rod of the connecting rod driving assembly is arranged in the middle of the connecting rod, the connecting rod pin passes through the connecting ring and the connecting rod to realize the connection between the connecting rod and the second piston frame. The second blocking part of the second piston body is matched with the connecting ring, the second blocking part can be sleeved outside the connecting ring, and the end face of the second blocking part is fixedly connected with the connecting ring through bolts to realize the blocking and limiting of the connecting rod pin by the second blocking part.

[0011] Compared with the prior art, the piston structure for preventing the connecting pin from falling off and the flow pressure regulating valve using the same have the following advantages: (1) The piston structure for preventing the connecting pin from falling off and the flow pressure regulating valve using the same can realize the blocking of the connecting rod pin in different types of flow pressure regulating valves through the blocking part, fundamentally eliminate the valve transmission failure accidents caused by the falling of the connecting rod pin, and greatly improve the reliability of the flow pressure regulating valve.

[0012] (2) The piston structure for preventing the connecting pin from falling off and the flow and pressure regulating valve using the same can greatly prolong the service life of the flow and pressure regulating valve, and reduce the maintenance cost caused by unplanned shutdown and system paralysis due to the falling off of the connecting rod pin. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application and are incorporated herein for explanation by way of the non-limiting examples of the present application. In the drawings: Figure 1 The first flow and pressure regulating valve cross section according to the embodiment of the present application Figure 1 ; Figure 2 The first flow and pressure regulating valve cross section according to the embodiment of the present application Figure 2 ; Figure 3 The first piston body front view according to the embodiment of the present application Figure 4 The first blocking part and connecting rod pin cooperation cross section according to the embodiment of the present application Figure 5 The second flow and pressure regulating valve cross section according to the embodiment of the present application Figure 6 The second piston body front view according to the embodiment of the present application Figure 7 The second blocking part and connecting rod pin cooperation cross section according to the embodiment of the present application

[0014] BRIEF DESCRIPTION OF DRAWINGS 1, the first flow and pressure regulating valve; 11, the first piston body; 111, the first flange plate; 112, the first flow guide cover; 113, the first blocking part; 1131, the blocking rod; 1132, the blocking block; 12, the second piston body; 121, the second flange plate; 122, the second flow guide cover; 123, the second blocking part; 2, the second flow and pressure regulating valve; 21, the first piston frame; 211, the connecting sheet; 22, the second piston frame; 221, the connecting ring; 3, the guide piston; 4, the connecting rod; 5, the flow guide cylinder; 6, the valve body; 7, the connecting rod pin. DETAILED DESCRIPTION

[0015] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] A piston structure to prevent the connecting pin from falling off is used to open a flow regulating and pressure regulating valve. The piston structure is mounted to a piston holder, which is connected to a connecting rod 4 via a connecting rod pin 7. The connecting rod 4 can drive the piston mechanism to move. Furthermore, the piston structure is provided with a blocking part, which can limit the two ends of the connecting rod pin 7 to prevent the connecting rod pin 7 from falling off the connecting rod 4.

[0020] Preferably, the piston structure includes a first piston body 11 and a second piston body 12; the blocking part includes a first blocking part 113 and a second blocking part 123. Among them, such as Figures 1-4 As shown, the first piston body 11 includes a first flange 111, a first flow guide shroud 112, and a first blocking portion 113; the surface of the first flow guide shroud 112 is provided with a plurality of flow guide holes. The end face of the first guide shield 112 is mounted to the surface of the first flange 111 to form an integral structure, and the inner circumferential surface of the first flange 111 is provided with two first blocking parts 113.

[0021] Preferably, the first blocking part 113 comprises a blocking rod 1131 and a blocking block 1132, the blocking block 1132 is installed to the blocking rod 1131 to form a long rod shaped in L shape, and the blocking block 1132 is used for blocking and limiting the connecting rod pin 7.

[0022] Preferably, as shown in the drawings, the second piston body 12 comprises a second flange plate 121, a second fairing 122 and a second blocking part 123, the end surface of the second fairing 122 is installed to the surface of the second flange plate 121 to form an integrated structure, and the second blocking part 123 is arranged at the center of the second flange plate 121 and used for connecting with the piston frame. Figures 5-7

[0023] Preferably, the second blocking part 123 can be connected with the second piston frame 22 as a separate part; the second blocking part 123 can also be connected with the second flange plate 121 and then connected with the second piston frame 22. Preferably, the second blocking part 123 is in a circular shape and used for blocking and limiting the connecting rod pin 7.

[0024] The flow regulating pressure valve uses the piston structure for preventing the connecting pin from falling off, and comprises a first flow regulating pressure valve 1 and a second flow regulating pressure valve 2. The first flow regulating pressure valve 1 comprises a first piston body 11, a first piston frame 21, a guide piston 3, a connecting rod driving assembly, a flow guide cylinder 5 and a valve body 6. The flow guide cylinder 5 and the connecting rod driving assembly are arranged in the valve body 6, the guide piston 3 is sleeved to the flow guide cylinder 5, and the first piston body 11 is connected with the guide piston 3 through the first piston frame 21. The first piston frame 21 is provided with two connecting plates 211 arranged in parallel, the connecting rod 4 of the connecting rod driving assembly is arranged between the two connecting plates 211, the connecting rod pin 7 passes through the connecting plate 211 and the connecting rod 4 to realize the connection between the connecting rod 4 and the first piston frame 21, and the two ends of the connecting rod pin 7 are flush with the surfaces on both sides of the connecting plate 211. The first blocking part 113 of the first piston body 11 is used for blocking and limiting the two ends of the connecting rod pin 7.

[0025] Preferably, the second flow regulating pressure valve 2 comprises a second piston body 12, a second piston frame 22, a guide piston 3, a connecting rod driving assembly, a flow guide cylinder 5 and a valve body 6. The flow guide cylinder 5 and the connecting rod driving assembly are arranged in the valve body 6, the guide piston 3 is sleeved to the flow guide cylinder 5, and the second piston body 12 is connected with the guide piston 3 through the second piston frame 22. ​The center of the second piston frame 22 is provided with a connecting ring 221, the connecting rod 4 of the connecting rod driving assembly is arranged in the middle of the connecting rod, the connecting rod pin 7 passes through the connecting ring 221 and the connecting rod 4, the connecting of the connecting rod 4 and the second piston frame 22 is realized, and the two ends of the connecting rod pin 7 are flush with the two side surfaces of the connecting ring 221; The second blocking part 123 of the second piston body 12 is matched with the connecting ring 221, the second blocking part 123 can be sleeved outside the connecting ring 221, and the end surface of the second blocking part 123 is fixedly connected with the connecting ring 221 through a bolt, so that the second blocking part 123 blocks and limits the connecting rod pin 7.

[0026] The first flow and pressure regulating valve 1 and the second flow and pressure regulating valve 2 are common valve bodies 6 at present, therefore, the specific structure and connection relationship in the valve bodies 6 are not described in detail, because most of the internal parts of the flow and pressure regulating valves are the same, the difference is that the structures of the parts are changed, but the working mode is not changed; The application improves the structures of two common flow and pressure regulating valves, so that the first blocking part 113 and the second blocking part 123 are added, the blocking and limiting of the connecting rod pin 7 are realized, and the stability of the flow and pressure regulating valve is improved.

[0027] The above only describes the preferred embodiments of the application, and is not used to limit the application, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A piston structure for preventing the falling of a connecting pin for opening a flow and pressure regulating valve, characterized in that: The piston structure is installed to the piston frame, the piston frame is connected with the connecting rod through the connecting rod pin, and the connecting rod can drive the piston mechanism to move, And the piston structure is provided with a blocking part, which can limit the two ends of the connecting rod pin and prevent the connecting rod pin from falling off the connecting rod.

2. The piston structure of claim 1, wherein: The piston structure includes a first piston body and a second piston body; the blocking part includes a first blocking part and a second blocking part; The first piston body includes a first flange plate, a first fairing, and a first blocking part; the surface of the first fairing is provided with a plurality of flow guide holes, The end surface of the first fairing is installed to the surface of the first flange plate to form an integrated structure, and the circumferential inner surface of the first flange plate is provided with two first blocking parts.

3. A piston structure according to claim 2, wherein: The first blocking part includes a blocking rod and a blocking block, the blocking block is installed to the blocking rod to form an L-shaped long rod, and the blocking block is used to block and limit the connecting rod pin.

4. The piston structure of claim 2, wherein: The second piston body includes a second flange plate, a second fairing, and a second blocking part, the end surface of the second fairing is installed to the surface of the second flange plate to form an integrated structure, and the second blocking part is arranged at the center of the second flange plate and used to connect with the piston frame.

5. A piston structure according to claim 4, wherein: The second blocking part is a circular shape and is used to block and limit the connecting rod pin.

6. A flow and pressure regulating valve using the piston structure for preventing the connecting pin from falling off according to any one of claims 1 to 5, characterized in that: It includes a first flow regulating valve and a second flow regulating valve; The first flow regulating valve includes a first piston body, a first piston frame, a guide piston, a connecting rod driving assembly, a flow guide cylinder, and a valve body; The flow guide cylinder and the connecting rod driving assembly are arranged in the valve body, the guide piston is sleeved to the flow guide cylinder, and the first piston body is connected with the guide piston through the first piston frame; The first piston frame is provided with two parallel connecting plates, the connecting rod of the connecting rod driving assembly is arranged between the two connecting plates, the connecting rod pin passes through the connecting plate and the connecting rod to realize the connection between the connecting rod and the first piston frame; The first blocking part of the first piston body is used to block and limit the two ends of the connecting rod pin.

7. The flow-regulating pressure-regulating valve according to claim 6, characterized in that: The second flow regulating valve includes a second piston body, a second piston frame, a guide piston, a connecting rod driving assembly, a flow guide cylinder, and a valve body; The flow guide cylinder and the connecting rod driving assembly are arranged in the valve body, the guide piston is sleeved to the flow guide cylinder, and the second piston body is connected with the guide piston through the second piston frame; The center of the second piston frame is provided with a connecting ring, the connecting rod of the connecting rod driving assembly is arranged in the middle of the connecting rod, the connecting rod pin passes through the connecting ring and the connecting rod to realize the connection between the connecting rod and the second piston frame; The second blocking part of the second piston body is matched with the connecting ring, the second blocking part can be sleeved on the outside of the connecting ring, and the end surface of the second blocking part is fixedly connected with the connecting ring through bolts to realize the blocking and limiting of the second blocking part to the connecting rod pin.

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