Displacement sensor for detecting valve stroke

Abstract

The utility model provides a displacement sensor for detecting the stroke of a valve, which comprises a stroke measuring rod, a conducting wire, a wire protecting pipe, a wire tightening nut, a rear cover, a circuit protecting shell, a signal processing circuit, a positioning thread cap and a valve cover cap, an electromagnetic induction piece is arranged in the stroke measuring rod, a concave groove is arranged below the stroke measuring rod, and the electromagnetic induction piece is arranged in the groove. The positioning thread cap and the valve cap are statically fixed on the valve; the measuring stroke rod penetrates through the positioning thread cap and the valve cap and is connected with the upper cover plate of the valve through a concave groove; the electromagnetic induction part is arranged in the measuring stroke rod, the electromagnetic induction part in the measuring stroke rod and the induction magnet in the positioning thread cap generate electromagnetic induction signals, the signals are transmitted to the signal processing circuit, and opening and closing actions of the valve are recognized according to the electromagnetic induction signals at different positions. The device can detect the opening and closing state and the opening and closing degree of the valve on line in real time, is high in measurement precision, and can effectively adjust the flow and the flow velocity of the valve.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a displacement sensor for detecting the stroke of a valve. Background Technique

[0002] At present, a large number of valves are applied in the industrial field. As the requirement for the accuracy of the valve stroke is getting higher and higher, when in use, it is necessary to detect the opening and closing state and the opening and closing degree of the valve. Measuring the actual stroke of the valve with a traditional rope-pulling sensor has been difficult to meet the accuracy requirements. When installing the rope-pulling sensor, the influence of human factors is very large, resulting in a large deviation in the actual stroke and unable to meet people's use. Content of the Utility Model

[0003] In view of this, in order to solve the problems in the technical background, the utility model proposes a displacement sensor for detecting the stroke of a valve that can detect the opening and closing state and the opening and closing degree of the valve in real time and online. The specific technical solutions are as follows:

[0004] A displacement sensor for detecting the stroke of a valve includes a measuring stroke rod, a wire, a wire protection tube, a wire tightening nut, a rear cover, a circuit protection housing, and a signal processing circuit. It also includes a positioning thread cap and a valve cap. The measuring stroke rod is internally provided with an electromagnetic induction component. A concave groove is provided below the measuring stroke rod. The positioning thread cap and the valve cap are fixedly stationary on the valve. The measuring stroke rod passes through the positioning thread cap and the valve cap and is connected to the upper cover plate of the valve through the concave groove.

[0005] Above the measuring stroke rod is provided a circuit protection housing. Inside the circuit protection housing is provided a signal processing circuit. Above the circuit protection housing is provided a rear cover. The signal processing circuit is connected to a wire. The wire extends upward through the rear cover. The outside of the wire is provided with a wire protection tube and a wire tightening nut.

[0006] In an embodiment of the utility model, a valve cap is provided on the valve. Above the valve cap is provided a positioning thread cap. A sealing ring is provided between the inner wall of the positioning thread cap and the surface of the measuring stroke rod. An induction magnet is provided inside the positioning thread cap.

[0007] In an embodiment of the utility model, the measuring stroke rod is integrally formed by machining, and the concave groove is integrally welded to the measuring stroke rod.

[0008] In an embodiment of the utility model, both ends of the concave groove have a large diameter, and the middle part has a small diameter, which is convenient for connecting to the upper cover plate of the valve and moving synchronously with the valve cover plate.

[0009] In an embodiment of the present utility model, a limiting retaining ring is provided above the concave groove, and the limiting retaining ring prevents the measuring travel rod from moving away from the valve cap during the opening process of the upper valve cover.

[0010] Adopting the above technical solution, the following beneficial effects are achieved:

[0011] The measuring travel rod of the present utility model is internally provided with an electromagnetic induction component. The electromagnetic induction component in the measuring travel rod generates an electromagnetic induction signal with the induction magnet in the positioning threaded nut, and the signal is transmitted to the signal processing circuit. The opening and closing actions of the valve are identified according to the electromagnetic induction signals at different positions. The present utility model can detect the opening and closing state and the degree of opening and closing of the valve in real time and online, with high measurement accuracy, and can effectively adjust the flow rate and velocity of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the measuring travel rod of a displacement sensor for detecting the valve stroke of the present utility model;

[0013] Figure 2 is a schematic structural diagram of a displacement sensor for detecting the valve stroke of the present utility model when in use Figure 1 ;

[0014] Figure 3 is a schematic structural diagram of a displacement sensor for detecting the valve stroke of the present utility model when in use Figure 2 ;

[0015] In the figure: 1 - wire; 2 - cable protection tube; 3 - wire tightening nut; 4 - rear cover; 5 - circuit protection housing; 6 - signal processing circuit; 7 - electromagnetic induction component; 8 - measuring travel rod; 9 - limiting retaining ring; 10 - concave groove; 11 - sealing ring; 12 - positioning threaded nut; 13 - valve cap; 14 - induction magnet; 15 - upper valve cover; 16 - lower valve cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0017] A displacement sensor for detecting the valve stroke in this embodiment is used to detect the opening and closing state of the valve. The sensor detects the opening and closing state and the degree of opening and closing of the valve in real time and online, so as to further adjust the flow rate and velocity of the valve.

[0018] See Figures 1 - 3A displacement sensor for detecting the stroke of a valve as shown includes a concave groove 10, a limit retaining ring 9, a measuring stroke rod 8, an electromagnetic induction component 7 inside the stroke rod, a signal processing circuit 6, a circuit protection housing 5, a rear cover 4, a wire tightening nut 3, a wire protection tube 2, a wire 1, a valve cap 13, a positioning threaded nut 12, an induction magnet 14, a sealing ring 11, etc. A concave groove 10 is provided below the measuring stroke rod 8. The positioning threaded nut 12 and the valve cap 13 are fixedly stationary on the valve. The measuring stroke rod 8 passes through the positioning threaded nut 12 and the valve cap 13 and is connected to the valve upper cover plate 15 through the concave groove 10.

[0019] A circuit protection housing 5 is provided above the measuring stroke rod 8. A signal processing circuit 6 is provided inside the circuit protection housing 5. A rear cover 4 is provided above the circuit protection housing 5. The signal processing circuit 6 is connected to a wire 1. The wire 1 extends upward through the rear cover 4. A wire protection tube 2 and a wire tightening nut 3 are provided outside the wire 1. A valve cap 13 is provided on the valve. A positioning threaded nut 12 is provided above the valve cap 13. A sealing ring 11 is provided between the inner wall of the positioning threaded nut 12 and the surface of the measuring stroke rod 8. An induction magnet 14 is provided inside the positioning threaded nut 12. The measuring stroke rod 8 is integrally formed. The concave groove 10 is integrally welded with the measuring stroke rod 8. The two ends of the concave groove 10 have a larger diameter, and the middle part has a smaller diameter, which is convenient for connecting with the valve upper cover plate 15 and moving synchronously with the valve cover plate. A limit retaining ring 9 is provided above the concave groove 10. The limit retaining ring 9 prevents the measuring stroke rod 8 from moving away from the valve cap 13 during the opening process of the valve upper cover plate 15.

[0020] The specific working principle of the present utility model is as follows: An electromagnetic induction component 7 is built in the measuring stroke rod 8 of the sensor. The measuring stroke rod 8 passes through the positioning threaded nut 12 and the valve cap 13 and is connected to the valve upper cover plate 15 through the concave groove 10. The positioning threaded nut 12 and the valve cap 13 are fixedly stationary on the valve. The movement of the valve upper cover plate 15 opens or closes the valve. Refer to Figure 3 As shown, the movement of the valve upper cover plate 15 drives the measuring stroke rod 8 to move. The electromagnetic induction component 7 inside the measuring stroke rod 8 and the magnet inside the positioning threaded nut 12 generate an electromagnetic induction signal. The signal is transmitted to the signal processing circuit 6, and the opening and closing actions of the valve are identified according to the electromagnetic induction signals at different positions.

[0021] In this embodiment, the movement of the valve upper cover plate 15 opens or closes the valve. Refer to Figure 2As shown, when the valve is closed, the upper cover plate 15 of the valve contacts the lower cover plate 16 of the valve. The movement of the upper cover plate 15 of the valve drives the movement of the measuring stroke rod 8. The built-in magnet in the positioning threaded nut 12 and the electromagnetic induction component 7 in the measuring stroke rod 8 generate an electromagnetic signal, which is transmitted to the signal processing circuit 6. The wire 1 is externally provided with a protective tube 2 to improve the protection performance of the wire 1. The measuring stroke rod 8 passes through the positioning threaded nut 12, and the built-in sealing ring 11 plays a role in sealing and positioning, and can accurately measure even in non-vertical situations. The electromagnetic induction component in the measuring stroke rod 8 and the magnet in the positioning threaded nut 12 generate an electromagnetic induction signal, and the signal is transmitted to the signal processing circuit 6 to identify the opening and closing actions of the valve according to the electromagnetic induction signals at different positions.

[0022] The above describes the basic principles and main features of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A displacement sensor for detecting valve travel, characterized in that: The invention comprises a measuring stroke rod (8), a conductor (1), a wire protection tube (2), a wire tightening nut (3), a rear cover (4), a circuit protection housing (5), a signal processing circuit (6), and also comprises a positioning threaded cap and a valve cover cap (13); the measuring stroke rod (8) has an electromagnetic induction element (7) built in; a concave groove (10) is provided below the measuring stroke rod (8); the positioning threaded cap (12) and the valve cover cap (13) are fixed to the valve in a stationary manner; the measuring stroke rod (8) passes through the positioning threaded cap (12) and the valve cover cap (13) and is connected to a valve upper cover plate (15) through the concave groove (10); A circuit protection housing (5) is provided above the measuring stroke rod (8), a signal processing circuit (6) is provided inside the circuit protection housing (5), a back cover (4) is provided above the circuit protection housing (5), the signal processing circuit (6) is connected to a wire (1), the wire (1) passes through the back cover (4) and extends upward, and a wire protection tube (2) and a wire tightening nut (3) are provided outside the wire (1).

2. A displacement sensor for detecting valve stroke according to claim 1, characterized in that: The valve is provided with a valve cover cap (13), a positioning thread cap (12) is provided above the valve cover cap (13), a sealing ring (11) is provided between the inner wall of the positioning thread cap (12) and the surface of the measuring stroke rod (8), and an induction magnet (14) is provided inside the positioning thread cap (12).

3. A displacement sensor for detecting valve stroke according to claim 1, characterized in that: The measured stroke rod (8) is integrally formed by machining, and the concave groove (10) is integrally welded with the measured stroke rod (8).

4. A displacement sensor for detecting valve stroke according to claim 1, characterized in that: The concave groove (10) has a large diameter at both ends and a small diameter in the middle.

5. A displacement sensor for detecting valve stroke according to claim 1, characterized in that: A limit retaining ring (9) is provided above the concave groove (10).

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