Valve detection device

Abstract

The utility model relates to the technical field of valves, and discloses a valve detection device which is suitable for a diaphragm valve, the diaphragm valve is provided with a pneumatic head, a piston is arranged in the pneumatic head, the diaphragm valve is connected with a screwed joint, the screwed joint is connected with a one-way valve, the diaphragm valve is communicated with the one-way valve through the screwed joint, and a valve core is arranged in the one-way valve. The two sensors are respectively connected with a counter and are respectively provided with an inductive head, one inductive head is arranged above the piston, and the other inductive head is arranged in the one-way valve. According to the valve detection device, whether the external electromagnetic valve is damaged or not is judged according to the sensing state of the sensing head in the diaphragm valve, the service life of the diaphragm valve is judged according to the sensing state of the sensing head in the one-way valve, and whether the external electromagnetic valve fails or not can be found in time through dual sensing achieved through the two sensors; therefore, the accuracy of diaphragm valve life test results is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a valve detection device. Background Art

[0002] Diaphragm valve is a stop valve that uses diaphragm as opening and closing parts to close the flow channel, cut off the fluid, and separate the inner cavity of the valve body from the inner cavity of the valve cover. The diaphragm is usually made of elastic, corrosion-resistant, and non-permeable materials such as rubber and plastic, and the valve body is mostly made of plastic, fiberglass, ceramic or metal-lined rubber materials. Diaphragm valve has a simple structure, good sealing and corrosion resistance, and low fluid resistance. It is often used for low-pressure, low-temperature, highly corrosive media and media containing suspended matter.

[0003] When testing the life of a diaphragm valve, a solenoid valve and a counter are generally used to count the number of times the diaphragm valve is opened and closed. Specifically, each time the solenoid valve is opened, the solenoid valve will pass driving gas to the pneumatic head of the diaphragm valve, so that the diaphragm valve is in an open state. When the solenoid valve is closed, the diaphragm valve is also in a closed state. Each time the solenoid valve is opened and closed, the counter counts once, and the number of times the counter counts is the life of the diaphragm valve. However, when the solenoid valve is damaged, it will be half-opened whether it is opened or closed. At this time, very little driving gas enters the diaphragm valve, causing the diaphragm in the diaphragm valve to be in a non-open or slightly open state. In this case, the number of times the solenoid valve is opened and closed calculated by the counter cannot be equal to the number of times the diaphragm valve is opened and closed, thus affecting the accuracy of the diaphragm valve life test results. Utility Model Content

[0004] The purpose of the utility model is to provide a valve detection device to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a valve detection device, suitable for a diaphragm valve, the diaphragm valve is provided with a pneumatic head, a piston is provided in the pneumatic head, the diaphragm valve is connected to a threaded joint, the threaded joint is connected to a one-way valve, the diaphragm valve and the one-way valve are connected through the threaded joint, a valve core is provided in the one-way valve, and also includes: two sensors, each of the two sensors is connected to a counter, each of the two sensors is provided with a sensing head, one sensing head is provided above the piston, and the other sensing head is provided in the one-way valve.

[0006] Preferably, the sensor comprises a first sensor, and the first sensor is fixed to the pneumatic head by bolts.

[0007] Preferably, the first sensor is provided with a first sensing head.

[0008] Preferably, the first sensing head is located above the piston.

[0009] Preferably, a second spring is arranged in the valve core.

[0010] Preferably, the one-way valve is connected to a second sensor.

[0011] Preferably, the second sensor is provided with a second sensing head.

[0012] Preferably, the second sensor head is located in the valve core.

[0013] Preferably, the one-way valve is connected to the exhaust nut.

[0014] Preferably, the one-way valve defines a flow channel, and the flow channel is located on one side of the valve core.

[0015] The valve detection device has the following beneficial effects:

[0016] The valve detection device determines whether the external solenoid valve is damaged by the sensing state of the sensing head in the diaphragm valve, and determines the life of the diaphragm valve by the sensing state of the sensing head in the one-way valve. The dual sensing achieved by two sensors can timely detect whether the external solenoid valve has failed, thereby improving the accuracy of the diaphragm valve life test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of a valve detection device provided in an embodiment of the present application;

[0018] Figure 2 A cross-sectional view of a valve detection device provided in an embodiment of the present application;

[0019] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0020] Figure 4 for Figure 2 Enlarged view of point B in the middle.

[0021] In the figure: 1. diaphragm valve; 11. pneumatic head; 12. air source hole; 13. first spring; 14. piston; 15. air flow channel; 16. air hole; 17. cavity; 18. valve stem; 19. diaphragm; 2. one-way valve; 21. valve core; 22. second spring; 3. threaded joint; 4. exhaust nut; 5. flow channel; 6. first sensor; 61. first sensing head; 7. second sensor; 71. second sensing head. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1-Figure 3 As shown, the utility model provides a valve detection device, which is suitable for a diaphragm valve 1. The diaphragm valve 1 is provided with a pneumatic head 11, a piston 14 is provided in the pneumatic head 11, a cavity 17 is provided below the piston 14, a first spring 13 is provided in the pneumatic head 11, one end of the first spring 13 is fixed to the inner wall of the pneumatic head 11, and the other end is fixed to the piston 14, an air flow channel 15 is downwardly opened on the top of the piston 14, the air flow channel 15 is connected with the air source hole 12 opened on the top of the pneumatic head 11, the output end of the external solenoid valve is connected with the air source hole 12, the air flow channel 15 also has an air hole 16 opened outwardly, and the air flow channel 15 is connected with the cavity 17 through the air hole 16.

[0024] The diaphragm valve 1 defines a flow channel 5 , a diaphragm 19 is disposed above the flow channel 5 , a valve stem 18 is disposed above the diaphragm 19 , the valve stem 18 is disposed between the piston 14 and the diaphragm 19 , and the three are coaxially disposed.

[0025] like Figure 1-Figure 2 , Figure 4 As shown, the diaphragm valve 1 is connected to the threaded joint 3, the threaded joint 3 is connected to the one-way valve 2, the one-way valve 2 is connected to the exhaust female nut 4, the diaphragm valve 1 and the one-way valve 2 are connected through the threaded joint 3, and a valve core 21 is set in the one-way valve 2.

[0026] The valve detection device also includes two sensors, which are a first sensor 6 and a second sensor 7. Each of the two sensors is connected to a counter (not shown in the figure) and is provided with a sensing head. One sensing head is provided above the piston 14 and the other sensing head is provided in the one-way valve 2.

[0027] Specifically, Figure 2-Figure 3 As shown, the first sensor 6 is fixed to the pneumatic head 11 by bolts. The first sensor 6 is provided with a first sensing head 61 , and the first sensing head 61 is located above the piston 14 .

[0028] In this embodiment, the external solenoid valve is opened, and the driving gas enters the air source hole 12 of the pneumatic head 11 on the diaphragm valve 1. The driving gas enters the cavity 17 through the air flow channel 15 and the air hole 16. The pressure in the cavity 17 increases, pushing the piston 14 upward until it contacts the first sensing head 61 above. At this time, the diaphragm 19 in the diaphragm valve 1 is in a fully open state.

[0029] like Figure 2 , Figure 4 As shown, the one-way valve 2 also has a flow channel 5, which is located on one side of the valve core 21. A second spring 22 is arranged in the valve core 21. The one-way valve 2 is connected to the second sensor 7. The second sensor 7 is provided with a second sensing head 71, and the second sensing head 71 is located in the valve core 21.

[0030] In this embodiment, after the diaphragm 19 in the diaphragm valve 1 is fully opened, the test gas flows from the flow channel 5 of the diaphragm valve 1 into the flow channel 5 of the one-way valve 2, and the valve core 21 moves to one side under the action of the test gas until it contacts the second sensor head 71.

[0031] When the external electromagnetic valve is closed, the driving gas stops being delivered, the piston 14 and the valve core 21 are reset under the action of the first spring 13 and the second spring 22, and both the two induction heads lose their induction.

[0032] The induction of the first induction head 61 and the second induction head 71 occurs successively, and the loss of induction also occurs successively. Each time the induction head senses once, the counter connected to the sensor counts once. The counter counts the number of inductions of the corresponding induction head. During the test, once the first induction head 61 on the first sensor 6 no longer senses after the external solenoid valve is opened, the external solenoid valve is damaged (because when the solenoid valve is damaged, whether it is opened or closed, the solenoid valve is in a half-open state. At this time, less driving gas enters the diaphragm valve 1, and the pressure in the cavity 17 is difficult to be realized). Now the piston 14 is in contact with the first sensing head 61. During this process, the diaphragm 19 is in a closed or slightly open state. The amount of test gas entering the one-way valve 2 from the diaphragm valve 1 is small. The small amount of test gas is not enough to push the valve core 21 to contact the second sensing head 71. The first sensing head 61 and the second sensing head 71 are in a non-sensing state, and the counters connected to the first sensor 6 and the second sensor 7 do not count). The staff needs to replace the new solenoid valve and continue to perform life detection on the diaphragm valve 1 until the second sensing head 71 no longer changes. The number of counts of the counter is the life of the diaphragm valve 1.

[0033] In the present application, whether the external solenoid valve is damaged is judged by the sensing state of the first sensing head 61 in the diaphragm valve 1, and the life of the diaphragm valve 1 is judged by the sensing state of the second sensing head 71 in the one-way valve 2. The dual sensing realized by two sensors can timely detect whether the external solenoid valve has failed, thereby improving the accuracy of the life test results of the diaphragm valve 1 and making the test results more reliable.

[0034] In addition, in the valve test, the sensing heads of the two sensors will not sense synchronously, and there will be a delay error, but it is a continuous sensing with a stable frequency. The life of the diaphragm valve 1 (that is, the final number of times counted by the counter) is calculated according to the data with the smallest number of times.

[0035] Working principle: The damage of the external solenoid valve is determined by the sensing state of the first sensing head 61 in the diaphragm valve 1, and the life of the diaphragm valve 1 is determined by the sensing state of the second sensing head 71 in the one-way valve 2. The dual sensing realized by two sensors can timely detect whether the external solenoid valve fails.

[0036] In summary, although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve detection device, suitable for a diaphragm valve (1), wherein the diaphragm valve (1) is provided with a pneumatic head (11), wherein a piston (14) is provided in the pneumatic head (11), and wherein: The diaphragm valve (1) is connected to a threaded joint (3), the threaded joint (3) is connected to a one-way valve (2), the diaphragm valve (1) and the one-way valve (2) are connected via the threaded joint (3), and a valve core (21) is arranged in the one-way valve (2); It also includes: two sensors, each of which is connected to a counter, and each of the two sensors is provided with a sensing head, one sensing head is provided above the piston (14), and the other sensing head is provided in the one-way valve (2).

2. A valve detection device according to claim 1, characterized in that: The sensor comprises a first sensor (6), wherein the first sensor (6) is fixed to the pneumatic head (11) by means of bolts.

3. A valve detection device according to claim 2, characterized in that: The first sensor (6) is provided with a first sensing head (61).

4. A valve detection device according to claim 3, characterized in that: The first sensing head (61) is located above the piston (14).

5. A valve detection device according to claim 1, characterized in that: A second spring (22) is arranged inside the valve core (21).

6. A valve detection device according to claim 5, characterized in that: The one-way valve (2) is connected to a second sensor (7).

7. A valve detection device according to claim 6, characterized in that: The second sensor (7) is provided with a second sensing head (71).

8. A valve detection device according to claim 7, characterized in that: The second sensing head (71) is located inside the valve core (21).

9. A valve detection device according to claim 1, characterized in that: The one-way valve (2) is connected to the exhaust female nut (4).

10. A valve detection device according to claim 5, characterized in that: The one-way valve (2) is provided with a flow channel (5), and the flow channel (5) is located on one side of the valve core (21).

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