Pneumatic valve additionally-installed position retaining device

Abstract

The utility model belongs to the technical field of pneumatic control valves, and discloses a pneumatic valve mounting and position retaining device which comprises a valve seat. The valve sleeve is connected with the valve seat in a conducting mode, the membrane chamber shell is installed at the top end of the valve sleeve, the membrane is installed on the inner side of the membrane chamber shell, the valve rod is installed below the membrane, and the top end of the valve rod is sleeved with the spring. The valve element is connected to the bottom end of the valve rod and extends to the inner side of the valve seat, the pressure signal inlet is formed in the top of the membrane chamber shell, the side wall of the valve sleeve is connected with an external thread connector in a communicating mode, and after a membrane is damaged, the air pressure on the inner side of the membrane chamber shell is abnormal, so that normal stretching and retracting of the valve rod are affected; and the stroke pointer cannot normally walk under the contrast of the stroke scale, so that the diaphragm can be replaced when being judged to be damaged manually, the valve core can reach a maintained station, and the normal work of the pneumatic valve is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic control valves, and more specifically, to a pneumatic valve with a position holding device added thereto. Background Art

[0002] Pneumatic control valves are one of the industrial process control instruments widely used in industrial enterprises such as petroleum, chemical, electric power, and metallurgy. When the current pneumatic control valves are in use, after the power supply is disconnected, they cannot hold the position, resulting in the valve closing automatically and being unusable. At the same time, there are no corresponding anti-blocking measures during use, which easily causes blockage inside the valve body for a long time, thus greatly reducing the practicality of the pneumatic control valve.

[0003] Patent authorization number CN218152606U discloses a pneumatic control valve that can achieve the function of holding the position when power and air are cut off, including a valve body. Through holes are provided on both sides of the left side of the valve body. An installation frame is arranged inside the left through hole. Socket holes are provided at both the upper and lower ends of the left through hole of the valve body, and the socket holes communicate with the through hole. Installation mechanisms are arranged inside the socket holes. A connecting column is arranged on the upper part of the valve body. A connecting frame is arranged on the upper part of the connecting column. A valve seat is arranged on the upper part of the connecting frame. A limiting mechanism is arranged on the right side inside the valve seat. A valve rod is rotatably arranged at the top end inside the valve seat, and the bottom end of the valve rod penetrates into the valve body. The installation mechanism includes a positioning rod and a positioning ring, which can limit and fix the valve rod after power failure, so that the pneumatic control valve can still continue to work. At the same time, the pneumatic control valve is not easily blocked through a filter screen, improving the service life of the pneumatic control valve.

[0004] However, the diaphragm installed inside the diaphragm chamber in patent authorization number CN218152606U is prone to aging and cracking during long-term use under pneumatic pressure, resulting in the diaphragm being unable to ensure the seal inside the diaphragm chamber, the spool being unable to reach the position holding station, and thus affecting the normal operation of the pneumatic valve. Therefore, a structure for monitoring the working state of the diaphragm needs to be added. So, we propose a pneumatic valve with a position holding device added thereto to solve the above existing problems. Summary of the Utility Model

[0005] 1. Technical Problems to be Solved

[0006] Aiming at the problems existing in the prior art, the purpose of the present utility model is to provide a pneumatic valve with a position holding device added thereto. After the diaphragm is damaged, the air pressure inside the diaphragm housing on the inner side is abnormal, affecting the normal expansion and contraction of the valve rod. The travel pointer can no longer move normally under the comparison of the travel scale, and it can be judged manually that the diaphragm is damaged and needs to be replaced to ensure that the spool can reach the position holding station and ensure the normal operation of the pneumatic valve.

[0007] 2. Technical Solutions

[0008] To solve the above problems, the present utility model adopts the following technical solutions.

[0009] An air-operated valve is equipped with a position-holding device, which includes a valve seat, a valve sleeve conductively connected to the valve seat, a diaphragm housing installed at the top of the valve sleeve, a diaphragm installed inside the diaphragm housing, a valve stem installed below the diaphragm, a spring sleeved on the top of the valve stem, a valve core connected to the bottom end of the valve stem and extending to the inside of the valve seat, and a pressure signal inlet provided at the top of the diaphragm housing. An external thread joint is conductively connected to the side wall of the valve sleeve;

[0010] A sleeve is detachably connected to the outside of the valve sleeve. An observation window is installed on the side wall of the sleeve away from the external thread joint. A travel scale is provided on the surface of the observation window. An internal thread joint that is screwed with the external thread joint is integrally formed on the side wall of the sleeve away from the observation window;

[0011] A limit block is installed on the outer wall of the valve stem corresponding to the external thread joint, and a travel pointer is installed on the side wall of the limit block.

[0012] Further, a stepped flange is integrally formed at the root of the external thread joint, and a sealing rubber ring is embedded in the stepped part of the stepped flange.

[0013] Further, a stepped groove is provided at the port part of the internal thread joint, and the stepped part of the stepped groove is in close fit with the sealing rubber ring.

[0014] Further, the end part of the pointer extends to the observation window.

[0015] Further, the observation window is made of transparent tempered glass.

[0016] Further, the inner diameter of the external thread joint is adapted to the total length of the travel scale.

[0017] Further, the chamber below the limit block is filled with a sealing packing for sealing the valve stem.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the advantages of the present utility model are as follows:

[0020] (1) In this solution, when the diaphragm is damaged, the air pressure inside the diaphragm housing is abnormal, which affects the normal expansion and contraction of the valve stem. The travel pointer cannot move normally under the comparison of the travel scale, and manual workers can judge that the diaphragm is damaged and need to replace it to ensure that the valve core can reach the position-holding working station to ensure the normal operation of the air-operated valve.

[0021] (2) In the process of screwing the internal thread joint with the external thread joint, the stepped groove provided at the port part of the internal thread joint is engaged with the stepped flange at the root of the external thread joint, and the sealing rubber ring is used to fill the gap between the stepped groove and the stepped flange, so as to ensure the sealing effect at the connection between the internal thread joint and the external thread joint. Brief Description of the Drawings

[0022] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0023] Figure 2 is a side view schematic diagram of the present utility model;

[0024] Figure 3 is a sectional view schematic diagram of part A-A of the present utility model;

[0025] Figure 4 is a structural schematic diagram of the external thread joint of the present utility model;

[0026] Figure 5 is a structural schematic diagram of the observation window of the present utility model.

[0027] Description of the reference numerals in the drawings:

[0028] 1. Valve seat; 2. Valve sleeve; 3. Diaphragm chamber housing; 4. Diaphragm; 5. Valve stem; 6. Spring; 7. Valve core; 8. External thread joint; 9. Sleeve housing; 10. Observation window; 11. Stroke scale; 12. Internal thread joint; 13. Limit block; 14. Pointer; 15. Stepped flange; 16. Sealing rubber ring; 17. Sealing filler; 18. Pressure signal inlet. Detailed Embodiment

[0029] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] Embodiment:

[0031] Please refer to Figures 1-5 , a pneumatic valve is equipped with a position holding device, including a valve seat 1, a valve sleeve 2 conductively connected to the valve seat 1, a diaphragm chamber housing 3 installed at the top of the valve sleeve 2, a diaphragm 4 installed inside the diaphragm chamber housing 3, a valve stem 5 installed below the diaphragm 4, a spring 6 sleeved on the top of the valve stem 5, a valve core 7 connected to the bottom end of the valve stem 5 and extending into the inside of the valve seat 1, and a pressure signal inlet 18 provided at the top of the diaphragm chamber housing 3. The side wall of the valve sleeve 2 is conductively connected to an external thread joint 8;

[0032] A housing 9 is detachably connected to the outer side of the valve sleeve 2. An observation window 10 is installed on the side wall of the housing 9 away from the external thread joint 8. A stroke scale 11 is arranged on the surface of the observation window 10. An internal thread joint 12 that is screwed with the external thread joint 8 is integrally formed on the side wall of the housing 9 away from the observation window 10;

[0033] A limit block 13 is installed at the outer wall part of the valve rod 5 corresponding to the external thread joint 8. A stroke pointer 14 is installed on the side wall of the limit block 13;

[0034] It should be noted that when the pneumatic valve is equipped with the position-holding device and in use, air pressure enters the inner side of the diaphragm outer housing 3 through the pressure signal inlet 18. The diaphragm 4 deforms under the action of the air pressure and conducts the pressure to the valve rod 5. While the spring 6 is compressed and deformed, the flow channel in the valve seat 1 is blocked by the valve core 7 at the bottom end of the valve rod 5. In the state where the diaphragm 4 is intact, the valve rod 5 can normally expand and contract in cooperation with the spring 6. At the same time, the stroke pointer 14 installed at the limit block 13 can move normally in the stroke under the comparison of the stroke scale 11 set at the observation window 10. When the diaphragm 4 is damaged, the air pressure inside the diaphragm outer housing 3 is abnormal, which affects the normal expansion and contraction of the valve rod 5, and the stroke pointer 14 can no longer move normally under the comparison of the stroke scale 11. Workers can judge that the diaphragm 4 is damaged and need to replace it to ensure that the valve core 7 can reach the position-holding working station to ensure the normal operation of the pneumatic valve.

[0035] As Figure 3 、 Figure 4 shown, a stepped flange 15 is integrally formed at the root of the external thread joint 8, and a sealing rubber ring 16 is embedded in the stepped part of the stepped flange 15. A stepped groove is opened at the port part of the internal thread joint 12, and the stepped part of the stepped groove is closely attached to the sealing rubber ring 16;

[0036] It should be noted that during the process of screwing the internal thread joint 12 with the external thread joint 8, the stepped groove set at the port part of the internal thread joint 12 is engaged with the stepped flange 15 at the root of the external thread joint 8, and the sealing rubber ring 16 is used to fill the gap between the stepped groove and the stepped flange 15, so as to ensure the sealing effect at the connection between the internal thread joint 12 and the external thread joint 8.

[0037] As Figure 3 、 Figure 5 shown, the end part of the pointer 14 extends to the observation window 10. The observation window 10 is made of transparent tempered glass. The inner diameter of the external thread joint 8 is adapted to the total length of the stroke scale 11;

[0038] It should be noted that while facilitating the viewing of the stroke movement of the pointer 14 through the observation window 10, the inner diameter of the external thread joint 8 can ensure the normal movement of the pointer 14 in cooperation with the stroke scale 11.

[0039] As Figure 3 shown, the chamber below the limit block 13 is filled with a sealing packing 17 for sealing the valve stem 5;

[0040] It should be noted that the sealing effect at the joint between the valve stem 5 and the chamber is ensured.

[0041] During use: The air pressure enters the inner side of the diaphragm outer shell 3 through the pressure signal inlet 18. The diaphragm 4 deforms under the action of the air pressure and conducts the pressure to the valve stem 5. While the spring 6 is compressed and deformed, the valve core 7 at the bottom end of the valve stem 5 is used to block the flow channel in the valve seat 1. In the state where the diaphragm 4 is intact, the valve stem 5 can cooperate with the spring 6 to expand and contract normally. At the same time, the travel pointer 14 installed at the limit block 13 can travel normally under the comparison with the travel scale 11 set at the observation window 10. When the diaphragm 4 is damaged, the air pressure inside the diaphragm outer shell 3 is abnormal, which affects the normal expansion and contraction of the valve stem 5, and the travel pointer 14 can no longer travel normally under the comparison with the travel scale 11. Workers can judge that the diaphragm 4 is damaged and needs to be replaced.

[0042] The above is only the preferred specific implementation mode of the present utility model; however, the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its improved concept, makes equivalent substitution or change, and should be covered by the protection scope of the present utility model.

Claims

1. A pneumatic valve is equipped with a position-holding device, comprising a valve seat (1), a valve sleeve (2) conductively connected to the valve seat (1), a diaphragm chamber housing (3) installed at the top of the valve sleeve (2), a diaphragm (4) installed on the inner side of the diaphragm chamber housing (3), a valve stem (5) installed below the diaphragm (4), a spring (6) sleeved on the top of the valve stem (5), a valve core (7) connected to the bottom end of the valve stem (5) and extending to the inner side of the valve seat (1), and a pressure signal inlet (18) arranged at the top of the diaphragm chamber housing (3), characterized in that: The side wall of the valve sleeve (2) is conductively connected to an external threaded joint (8); The outer side of the valve sleeve (2) is detachably connected to a sleeve shell (9), a side wall of the sleeve shell (9) away from the external threaded joint (8) is provided with an observation window (10), a surface of the observation window (10) is provided with a stroke scale (11), and a side wall of the sleeve shell (9) away from the observation window (10) is integrally formed with an internal threaded joint (12) threadedly connected to the external threaded joint (8); A limit block (13) is installed on the valve stem (5) at an outer wall portion corresponding to the external threaded joint (8), and a travel pointer (14) is installed on the side wall of the limit block (13).

2. The pneumatic valve equipped with a position retaining device according to claim 1 is characterized in that: A stepped flange (15) is integrally formed at the root of the external threaded joint (8), and a sealing rubber ring (16) is embedded in the stepped portion of the stepped flange (15).

3. The pneumatic valve equipped with a position retaining device according to claim 2 is characterized in that: A stepped groove is provided at the end portion of the internal thread joint (12), and the stepped portion of the stepped groove is tightly fitted to the sealing rubber ring (16).

4. The pneumatic valve equipped with a position retaining device according to claim 1 is characterized in that: The tip of the pointer (14) extends to the observation window (10).

5. The pneumatic valve equipped with a position retaining device according to claim 1 is characterized in that: The observation window (10) is made of transparent tempered glass.

6. The pneumatic valve equipped with a position retaining device according to claim 1 is characterized in that: The inner diameter of the external threaded joint (8) is adapted to the overall length of the stroke scale (11).

7. The pneumatic valve equipped with a position retaining device according to claim 1 is characterized in that: The chamber below the limit block (13) is filled with sealing filler (17) for sealing the valve stem (5).

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