Valve position signal feedback device suitable for seawater environment

Abstract

The utility model belongs to the field of fluid automation control, and discloses a valve position signal feedback device suitable for a seawater environment, which comprises a box body provided with a cavity, a cam is arranged in the cavity, the cam penetrates through the bottom surface of the box body and is connected with the output end of an external component, and the cam rotates along with the rotation of an output shaft of the external component; the analog quantity proximity sensor is mounted in the cavity; the analog quantity proximity sensor recognizes the distance between the cam and the analog quantity proximity sensor and outputs analog signals in real time to feed back the position of the output shaft; a cable of the analog quantity proximity sensor is hermetically connected with the waterproof joint; the box cover is used for sealing the top opening of the box body; the box cover is provided with a through hole containing the cam, and an opening of the through hole is sealed. The characteristic that the cam converts rotary motion into linear motion is utilized, the analog quantity proximity sensor recognizes the distance between the cam and the analog quantity proximity sensor and outputs analog signals in real time to feed back the position of the output shaft, precision is high, and the situation that accumulative errors are generated due to the fact that service time is prolonged does not exist.

Description

Technical Field

[0001] This utility model relates to a valve position signal feedback device suitable for seawater environments, belonging to the field of fluid automation control. Background Technology

[0002] Most hydraulic actuators on the market today are manufactured by adding... Figure 1 The valve feedback device (also called a limit switch) shown uses the closed state of its built-in switch to determine whether the valve has been fully opened or closed. However, the rotating shaft of most valve feedback devices (also called limit switches) is made of nickel-plated carbon steel, and the bracket is made of ordinary 304 stainless steel. The highest protection level is only IP67, which is insufficient for long-term underwater operation. A small number of these devices are modified by adding... Figure 2 The gear-type valve position indicator (also called a gear flow meter) shown uses the indicated value of the gear-type valve position indicator (also called a gear flow meter) to determine whether the valve is in the correct position. However, the accuracy of the gear-type valve position indicator (also called a gear flow meter) is easily affected by factors such as the machining precision of the gears, the viscosity of the hydraulic oil, the degree of contamination of the hydraulic oil, and temperature differences. Moreover, this error accumulates with the increase of usage time and is difficult to zero out. Utility Model Content

[0003] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a valve position signal feedback device suitable for seawater environments. It utilizes the characteristic of a cam to convert rotational motion into linear motion and uses an analog proximity sensor to identify the distance between the cam and the analog proximity sensor to output an analog signal for feedback of the output shaft position.

[0004] To achieve the goal of solving the above problems, the technical solution adopted by this utility model is to provide a valve position signal feedback device suitable for seawater environment, including a box, the box having a cavity, a cam installed in the cavity, the cam passing through the bottom surface of the box and used to connect to the output end of an external component, the cam rotating with the output shaft of the external component;

[0005] An analog proximity sensor is installed inside the cavity, located on one side of the cam; the analog proximity sensor identifies the distance between the cam and the analog proximity sensor and outputs an analog signal in real time to provide feedback on the position of the output shaft;

[0006] A waterproof connector extends through one side wall of the enclosure, and the cable of the analog proximity sensor is sealed to the waterproof connector.

[0007] The lid is sealed to the top opening of the box body to seal the cavity; the lid has a through hole for receiving the cam, and the opening of the through hole is sealed.

[0008] According to this utility model, the top surface of the cam is further fixedly connected to an indicator cover, and the surface of the indicator cover has an arrow mark.

[0009] According to this utility model, the analog proximity sensor is further mounted inside the cavity via a mounting bracket.

[0010] According to this utility model, the through hole of the box cover is further sealed by an oil gauge.

[0011] According to this utility model, the top surface of the cavity peripheral wall of the housing is provided with an edge, the edge position corresponds to the position of the waterproof connector, and is located above the waterproof connector; the edge is provided with a potting hole A for injecting sealant to fill the gap between the cable of the analog proximity sensor and the waterproof connector.

[0012] According to this utility model, the bottom of the box is provided with a sealing component to seal around the through hole and prevent seawater from entering the box through the through hole.

[0013] According to this invention, in the absence of needing to output analog signals for real-time feedback of the output shaft position, an inductive proximity switch is used instead of an analog proximity sensor to provide feedback on the open and closed positions of the output shaft.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This utility model can provide real-time feedback with high precision.

[0016] Utilizing the characteristic of a cam to convert rotary motion into linear motion, an analog proximity sensor identifies the distance between the cam and the analog proximity sensor and outputs an analog signal in real time to provide feedback on the position of the output shaft. This method offers high accuracy and eliminates the possibility of cumulative errors due to increased usage time.

[0017] 2. This utility model has a fully enclosed structure, high protection level, and is resistant to seawater.

[0018] The through-hole between the housing and the upper surface of the hydraulic actuator is sealed with a sealant, and the mating surfaces of the housing and the cover are sealed with sealant. The cable of the analog proximity sensor and the waterproof connector mounted on the housing are sealed together, and sealant is applied through the glue-filling hole to fill the gap between the cable and the waterproof connector. The through-hole of the cover is sealed with an oil level indicator to ensure that the product meets the IP68 protection standard. On this basis, the entire outer surface of the product is sprayed with seawater paint or a seawater corrosion-resistant material is used, making it suitable for long-term operation underwater in seawater. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a valve feedback device in the prior art;

[0020] Figure 2 This is a schematic diagram of a gear-type valve position indicator (gear flow meter) in the prior art;

[0021] Figure 3 This is a schematic diagram of an inductive proximity switch;

[0022] Figure 4 This is an exploded view of the valve position signal feedback device of this utility model installed on the top of a hydraulic actuator;

[0023] Figure 5 This is a partial cross-sectional structural diagram of the box body of this utility model;

[0024] Figure 6 This is a schematic diagram of the valve position signal feedback device of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Box body, 2-Analog proximity sensor, 3-Cam, 4-Indicator cover, 5-Box cover, 6-Oil level indicator, 7-Waterproof connector, 8-First screw, 9-Second screw, 10-Third screw, 11-Sealing screw, 12-First sealing ring, 13-Second sealing ring, 14-Mounting bracket, 15-Edge, A-Pour hole, B-Hydraulic actuator. Detailed Implementation

[0027] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings:

[0028] This utility model provides a valve position signal feedback device, such as Figures 4-6 As shown, it includes a housing 1 with a cavity. A through hole is provided in the inner plane of the cavity of housing 1. A cam 3 passes through the through hole of housing 1. The axis of the cam 3 is perpendicular to the inner plane of the cavity of housing 1, and the cam 3 rotates within the through hole of housing 1. An indicator cover 4 is provided on the top surface of the cam 3, and the indicator cover 4 is fixed to the cam 3 by a third screw 10. An analog proximity sensor 2 is also provided in the cavity, located on the side of the cam 3. The analog proximity sensor 2 is mounted on a mounting bracket 14 and... The second screw 9 is fixed to the inner plane of the cavity of the housing 1; a wire hole is provided on one side wall of the housing 1, through which the cable of the analog proximity sensor 2 passes. A waterproof connector 7 is also provided in the wire hole to seal the cable of the analog proximity sensor 2; a cover 5 is provided on the top of the housing 1, which is locked to the top of the housing 1 with a sealing screw 11 and seals the cavity of the housing 1; the cover 5 has a through hole for accommodating the cam 3, which has an upwardly protruding outer edge and is sealed by an oil level indicator 6.

[0029] In this embodiment of the application, the surface of the indicator cover 3 has an arrow mark.

[0030] In this embodiment of the application, the top surface of the cavity peripheral wall of the housing 1 is provided with an edge 15, the position of the edge 15 corresponds to the position of the wire hole, and is located above the wire hole. The edge 15 is provided with a potting hole A, which is used to inject sealant to fill the gap between the cable of the analog proximity sensor 2 and the waterproof connector 7.

[0031] In this embodiment of the application, a first sealing ring 12 is provided around the through hole of the mounting cam 3 at the bottom of the box 1, and a second sealing ring 13 is provided at the mounting through hole at the bottom of the box 1 to prevent seawater from entering the interior of the box 1 through the through hole.

[0032] Preferably, when this invention is used in conjunction with the upper surface of a hydraulic actuator, a flat sealant or rubber pad can be used instead of the first sealing ring 12 and the second sealing ring 13 located around the through hole at the bottom of the housing.

[0033] Preferably, when there is no need to output an analog signal for real-time feedback of the output shaft position, an inductive proximity switch (such as...) can be used. Figure 3 It replaces analog proximity sensor 2 to provide feedback on the open and closed positions of the output shaft.

[0034] The working principle of this utility model is as follows:

[0035] The working principle of the actuator of this utility model is as follows: Figure 4 As shown: Housing 1 is fixed to the top of hydraulic actuator B using first screw 8. The through hole between housing 1 and the upper surface of hydraulic actuator is sealed using first sealing ring 12 and second sealing ring 13. Cam 3 inside the cavity of housing 1 is fitted onto the output shaft of hydraulic actuator. When the output shaft of hydraulic actuator rotates clockwise, cam 3 also rotates clockwise. The arrow mark on the indicator cover above cam 3 also rotates clockwise with cam 3, indicating the rotation position. Analog proximity sensor 2 outputs a 4-20mA DC current in real time based on the distance between cam 3 and analog proximity sensor 2 to provide feedback on the position of output shaft. Similarly, when the output shaft of hydraulic actuator rotates counterclockwise, cam 3 also rotates counterclockwise. The arrow mark on the indicator cover above cam 3 also rotates counterclockwise with cam 3, indicating the rotation position. Analog proximity sensor 2 outputs a 20-4mA DC current in real time based on the distance between cam 3 and analog proximity sensor 2 to provide feedback on the position of output shaft.

[0036] This utility model features a fully enclosed structure, allowing it to operate underwater for extended periods. The through-hole between the housing 1 and the upper surface of the hydraulic actuator is sealed with a sealant, and the mating surfaces of the housing 1 and the cover 5 are sealed with sealant. The cable of the analog proximity sensor 2 is sealed to the waterproof connector 7 mounted on the housing, and sealant is applied through the glue-filling hole A to fill the gap between the cable and the waterproof connector. The through-hole of the cover 5 is sealed with an oil level indicator 6 to ensure that the product meets the IP68 protection standard. Furthermore, the entire outer surface of the product is coated with seawater paint or made of a seawater-resistant material, making it suitable for long-term underwater operation.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit this utility model in any form or substance. It should be noted that those skilled in the art can make several improvements and additions without departing from this utility model, and these improvements and additions should also be considered within the protection scope of this utility model. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of this utility model are equivalent embodiments of this utility model. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of this utility model still fall within the scope of the technical solution of this utility model.

Claims

1. A valve position signal feedback device suitable for seawater environments, characterized in that, Includes a housing with a cavity, in which a cam is installed. The cam passes through the bottom surface of the housing and is used to connect to the output end of an external component. The cam rotates as the output shaft of the external component rotates. An analog proximity sensor is installed inside the cavity, located on one side of the cam; the analog proximity sensor identifies the distance between the cam and the analog proximity sensor and outputs an analog signal in real time to provide feedback on the position of the output shaft; A waterproof connector extends through one side wall of the enclosure, and the cable of the analog proximity sensor is sealed to the waterproof connector. The lid is sealed to the top opening of the box body to seal the cavity; the lid has a through hole for receiving the cam, and the opening of the through hole is sealed.

2. The valve position signal feedback device suitable for seawater environment as described in claim 1, characterized in that, An indicator cover is fixedly connected to the top surface of the cam, and the surface of the indicator cover has an arrow mark.

3. The valve position signal feedback device suitable for seawater environment as described in claim 1, characterized in that, The analog proximity sensor is mounted inside the cavity via a mounting bracket.

4. A valve position signal feedback device suitable for seawater environments as described in claim 1, characterized in that, The through hole of the box cover is sealed with an oil gauge.

5. A valve position signal feedback device suitable for seawater environments as described in claim 1, characterized in that, The top surface of the cavity peripheral wall of the housing is provided with an edge, the position of which corresponds to the position of the waterproof connector and is located above the waterproof connector; the edge is provided with a potting hole A for injecting sealant to fill the gap between the cable of the analog proximity sensor and the waterproof connector.

6. A valve position signal feedback device suitable for seawater environments as described in claim 1, characterized in that, The bottom of the tank is equipped with a sealing component to seal around the through hole and prevent seawater from entering the tank through the through hole.

7. A valve position signal feedback device suitable for seawater environments as described in claim 1, characterized in that, When there is no need to output an analog signal for real-time feedback of the output shaft position, an inductive proximity switch can be used instead of an analog proximity sensor to provide feedback on the open and closed positions of the output shaft.

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