Low-leakage plunger valve with pressure compensation function

Abstract

The utility model belongs to the technical field of plunger valve, and disclose a low leakage plunger valve with pressure compensation function, including plunger valve main part, the surface of plunger valve main part is equipped with pressure compensation subassembly, pressure compensation subassembly includes the compensation box of symmetrical installation in plunger valve main part outside and the flow channel and pressure regulation of opening in plunger valve main part inside fine adjustment sleeve, driving disc, compensation plate, sealing strip, compensation rod, compensation spring, threaded rod, the surface of compensation box is equipped with overpressure alarm subassembly, the utility model has can carry out fine pressure compensation processing to the demand of different working conditions, avoid different working conditions to the pressure compensation range difference, difficult accurate matching, and can self -adaptation to the compensation processing of internal pressure, has improved the sealing of valve greatly, when internal pressure is too big or too small, to the outside reminding processing, avoid the situation such as leakage etc.

Description

Technical Field

[0001] This utility model belongs to the field of plunger valve technology, specifically a low-leakage plunger valve with pressure compensation function. Background Technology

[0002] In industrial fields such as petrochemicals, natural gas transportation, hydraulic control systems, and precision fluid metering, plunger valves are widely used for on / off control and flow regulation of fluid media due to their simple structure, convenient operation, and relatively stable sealing performance. The core working principle of this type of valve is to change the sealing fit between the plunger and the valve seat by axial movement of the plunger within the valve body, thereby opening or closing the fluid passage.

[0003] In industrial fluid transport systems, the pressure of the fluid medium often fluctuates due to changes in operating conditions (such as pump start-up and shutdown, changes in pipeline resistance, and downstream load adjustments). Traditional plunger valves lack an effective pressure compensation mechanism. When the system pressure increases, the fluid pressure acts on the plunger end face, causing an increase in the axial force on the plunger. If the actuator's driving force is insufficient, the plunger may fail to close completely or close lag, further exacerbating leakage. When the system pressure decreases, the sealing pressure between the plunger and the valve seat decreases accordingly, which also leads to a decline in sealing performance. At the same time, pressure fluctuations may also cause the plunger to vibrate, shortening the valve's service life. They cannot adaptively compensate for internal pressure.

[0004] Furthermore, the fixed design of existing compensation schemes cannot adapt to the needs of multiple operating conditions. The internal pressure of different operating conditions often has fundamental differences. These different operating conditions have different requirements for the range of pressure compensation, making it difficult to accurately match the current operating condition. This further exacerbates the instability of multi-operating condition operation. Moreover, if the pressure is too high or too low, it is impossible to alert the outside world, which can easily lead to leakage and other situations.

[0005] Therefore, a low-leakage plunger valve with pressure compensation function is proposed to address the above problems. Utility Model Content

[0006] To address the problems mentioned in the background art, this utility model provides a low-leakage plunger valve with pressure compensation function. It has the advantages of being able to perform fine pressure compensation processing for the needs of different working conditions, avoiding the difficulty in accurately matching different working conditions with different pressure compensation ranges, and being able to adaptively compensate for internal pressure, which greatly improves the valve's sealing performance. When the internal pressure is too high or too low, it will alert the outside world to avoid leakage and other situations.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a low-leakage plunger valve with pressure compensation function, comprising a plunger valve body;

[0008] The surface of the plunger valve body is equipped with a pressure compensation assembly, which includes a compensation box symmetrically installed on the outer side of the plunger valve body, a flow channel opened inside the plunger valve body, a fine-tuning sleeve for pressure regulation, a drive disc, a compensation plate, a sealing strip, a compensation rod, a compensation spring, and a threaded rod.

[0009] An overpressure alarm assembly is installed on the surface of the compensation box. The overpressure alarm assembly includes an alarm installed on the upper surface of the compensation box, a pressure detection module evenly distributed on the inner side wall of the plunger valve body, and a controller for control.

[0010] Preferably, the fine-tuning sleeve is installed on one side surface of the compensation box, the compensation plate is slidably connected to the inside of the compensation box, the drive disk is slidably connected to the inside of the fine-tuning sleeve, the compensation rod is slidably connected to a through hole opened on the surface of the drive disk, and one end of the compensation rod passes through the drive disk and is connected to the compensation plate.

[0011] Preferably, the compensating spring is sleeved on one end of the compensating rod, and one end of the compensating spring is connected to the compensating plate, while the other end of the compensating spring is connected to the drive disc.

[0012] Preferably, the two sealing strips are symmetrically embedded inside the compensation plate and fit against the inner sidewall of the compensation box.

[0013] Preferably, the threaded rod is threaded into a threaded hole on the surface of the fine-tuning sleeve, and one end of the threaded rod passes through the fine-tuning sleeve and is rotatably connected to the drive disc.

[0014] Preferably, the two sets of pressure detection modules are respectively installed at the inlet and outlet ends of the plunger valve body.

[0015] Preferably, the controller is installed on the outer side of the compensation box and is electrically connected to the alarm and the pressure detection module, respectively.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. This utility model incorporates a pressure compensation component, which works in conjunction with a fine-tuning sleeve, a drive disc, a compensation plate, a compensation rod, a compensation spring, and a threaded rod. The compensation spring dynamically adapts to pressure changes through elastic deformation, and the threaded rod allows for precise adjustment of the compensation reference. This enables refined pressure compensation for different working conditions, avoiding the difficulty in accurately matching different pressure compensation ranges under different working conditions. Furthermore, it can adaptively compensate for internal pressure, greatly improving the sealing performance of the plunger valve body.

[0018] 2. This utility model incorporates an overpressure alarm component. Two pressure detection modules collect the inlet feed pressure and outlet discharge pressure respectively. The controller can compare the difference between the two to determine whether the valve is blocked, leaking internally, or otherwise abnormal. It can quickly identify overpressure conditions and trigger the alarm, thus avoiding safety accidents caused by overpressure leading to seal damage, valve body deformation, or media leakage, and improving the operational safety of the plunger valve. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the main body and flow channel of the plunger valve of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the plunger valve body and compensation box of this utility model;

[0022] Figure 4 This is a schematic diagram of the internal structure of the compensation box of this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the compensation box and compensation plate of this utility model.

[0024] In the diagram: 1. Piston valve body; 2. Pressure compensation assembly; 21. Compensation box; 22. Flow channel; 23. Fine adjustment sleeve; 24. Drive disc; 25. Compensation plate; 26. Sealing strip; 27. Compensation rod; 28. Compensation spring; 29. ​​Threaded rod; 3. Overpressure alarm assembly; 31. Alarm; 32. Pressure detection module; 33. Controller. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figures 1 to 5 As shown, this utility model provides a low-leakage plunger valve with pressure compensation function, including a plunger valve body 1;

[0027] A pressure compensation assembly 2 is installed on the surface of the plunger valve body 1. The pressure compensation assembly 2 includes a compensation box 21 symmetrically installed on the outer side of the plunger valve body 1, a flow channel 22 opened inside the plunger valve body 1, a pressure adjustment sleeve 23, a drive disc 24, a compensation plate 25, a sealing strip 26, a compensation rod 27, a compensation spring 28, and a threaded rod 29.

[0028] The fine-tuning sleeve 23 is installed on one side surface of the compensation box 21. The compensation plate 25 is slidably connected to the inside of the compensation box 21. The drive disc 24 is slidably connected to the inside of the fine-tuning sleeve 23. The compensation rod 27 is slidably connected to the through hole opened on the surface of the drive disc 24. One end of the compensation rod 27 passes through the drive disc 24 and is connected to the compensation plate 25. The fine-tuning sleeve 23, drive disc 24, compensation plate 25, compensation rod 27, compensation spring 28, threaded rod 29 and other components work together. The compensation spring 28 can dynamically adapt to pressure changes through elastic deformation. The threaded rod 29 can finely adjust the compensation reference and perform fine pressure compensation processing for the needs of different working conditions. This avoids the difficulty in accurately matching the different pressure compensation ranges of different working conditions. It can also adaptively compensate for internal pressure, which greatly improves the sealing performance of the plunger valve body 1.

[0029] The compensating spring 28 is sleeved on one end of the compensating rod 27, and one end of the compensating spring 28 is connected to the compensating plate 25. The other end of the compensating spring 28 is connected to the drive disk 24 to realize dynamic self-adaptation of pressure compensation. It can generate a reverse elastic force through compression or extension to form a compensating force that matches the current pressure. No real-time intervention by the operator is required, reducing manual maintenance costs and avoiding leakage caused by untimely manual adjustment.

[0030] Two sealing strips 26 are symmetrically embedded inside the compensation plate 25 and fit against the inner wall of the compensation box 21. The two sealing strips 26 are symmetrically embedded inside the compensation plate 25 to form a base seal of the compensation plate 25 and a reinforced seal of the sealing strips 26, which can effectively prevent fluid from leaking from the gap between the compensation plate 25 and the compensation box 21.

[0031] The threaded rod 29 is threaded into the threaded hole on the surface of the fine adjustment sleeve 23, and one end of the threaded rod 29 passes through the fine adjustment sleeve 23 and is rotatably connected to the drive disk 24. The threaded transmission realizes micron-level fine adjustment to adapt to different pressure requirements, pushes the drive disk 24 to move slightly along the axial direction, and then changes the pre-compression of the compensation spring 28 through the compensation rod 27 to realize the fine setting of the compensation force.

[0032] An overpressure alarm assembly 3 is installed on the surface of the compensation box 21. The overpressure alarm assembly 3 includes an alarm 31 installed on the upper surface of the compensation box 21, a pressure detection module 32 evenly distributed on the inner wall of the plunger valve body 1, and a controller 33 for control.

[0033] Two pressure detection modules 32 are installed at the inlet and outlet ends of the plunger valve body 1, respectively. The two pressure detection modules 32 collect the feed pressure at the inlet end and the discharge pressure at the outlet end, respectively. The controller 33 can determine whether there is an abnormal state such as blockage or internal leakage of the valve by comparing the difference between the two. It can quickly identify the overpressure state and trigger the alarm 31 to avoid safety accidents caused by overpressure damage to the seals, deformation of the valve body or leakage of the medium, thereby improving the operational safety of the plunger valve body 1.

[0034] The controller 33 is installed on the outer side of the compensation box 21 and is electrically connected to the alarm 31 and the pressure detection module 32 respectively, forming an automated process of "pressure signal acquisition - real-time analysis - alarm triggering", which buys valuable time for operators to intervene and avoids the overpressure state from causing damage to the seals or rupture of the plunger valve body 1.

[0035] Among them, the structure of the plunger valve body 1, the alarm 31 and the pressure detection module 32 are existing technologies, and their working principle is a well-known technology. The appropriate model is selected according to the actual use.

[0036] Working principle and process: First, based on the design pressure of the current operating condition, the initial compensation force is set by adjusting the threaded rod 29. Rotating the threaded rod 29, because it is threadedly connected to the threaded hole on the surface of the fine-tuning sleeve 23, the threaded rod 29 will push the drive disk 24 to slide inside the fine-tuning sleeve 23 axially. The drive disk 24 drives the compensation plate 25 to move synchronously through the compensation rod 27. At this time, the compensation spring 28 sleeved on one end of the compensation rod 27 will generate a pre-compression due to the change in the relative position between the compensation plate 25 and the drive disk 24, forming an initial compensation force that matches the initial pressure of the current operating condition. This ensures that the compensation plate 25 forms a stable initial seal on the inner wall of the compensation box 21 through the sealing strip 26, avoiding the risk of leakage during initial operation.

[0037] When the fluid pressure is lower than the design pressure of the current working condition, the pressure of the fluid on the compensation plate 25 decreases. At this time, the pre-compression force of the compensation spring 28 will push the compensation plate 25 to move closer to the flow channel 22. The compensation plate 25 drives the sealing strip 26 to move synchronously, always maintaining a tight fit with the inner wall of the compensation box 21.

[0038] When the fluid pressure is higher than the design pressure for the current operating condition, the fluid pressure acts on the side of the compensation plate 25 facing the flow channel 22, pushing the compensation plate 25 to move away from the flow channel 22; the compensation plate 25 compresses the compensation spring 28 through the compensation rod 27, the compensation rod 27 slides in the through hole opened on the surface of the drive disk 24, and the elastic force of the compensation spring 28 increases with the increase of the compression amount, forming a dynamic compensation force that matches the high pressure, offsetting the impact of the fluid pressure on the compensation plate 25; at the same time, the medium flows into the interior of the compensation box 21;

[0039] When the system pressure exceeds the safety threshold, the pressure detection module 32 at the inlet and outlet of the plunger valve body 1 detects that the fluid pressure exceeds the overpressure threshold preset by the controller 33. The pressure detection module 32 converts the overpressure signal into an electrical signal and transmits it to the controller 33 in real time. The controller 33 verifies the signal and, after eliminating signal interference and other misjudgment factors, confirms that the current state is overpressured. The controller 33 immediately sends a trigger signal to the alarm 31, and the alarm 31 activates the audible and visual alarm, simultaneously reminding the on-site operators through sound prompts (such as a continuous buzzer) and light prompts (such as a flashing red warning light).

[0040] At the same time the alarm is triggered, the pressure compensation component 2 will perform compensation protection under extreme pressure: the overpressure fluid pushes the compensation plate 25 to compress the compensation spring 28 to the maximum extent, and the elastic force of the compensation spring 28 reaches its maximum value, briefly blocking the leakage of the overpressure fluid, giving the operator time to close the upstream valve and reduce the system pressure, and avoiding the overpressure state from causing damage to the seals or deformation of the valve body structure.

[0041] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-leakage plunger valve with pressure compensation function, comprising a plunger valve body (1); Its features are: The surface of the plunger valve body (1) is equipped with a pressure compensation assembly (2). The pressure compensation assembly (2) includes a compensation box (21) symmetrically installed on the outer side of the plunger valve body (1), a flow channel (22) opened inside the plunger valve body (1), a pressure adjustment sleeve (23), a drive disc (24), a compensation plate (25), a sealing strip (26), a compensation rod (27), a compensation spring (28), and a threaded rod (29). The surface of the compensation box (21) is equipped with an overpressure alarm assembly (3). The overpressure alarm assembly (3) includes an alarm (31) installed on the upper surface of the compensation box (21), a pressure detection module (32) evenly distributed on the inner wall of the plunger valve body (1), and a controller (33) for control.

2. A low-leakage plunger valve with pressure compensation function according to claim 1, characterized in that: The fine adjustment sleeve (23) is installed on one side surface of the compensation box (21), the compensation plate (25) is slidably connected inside the compensation box (21), the drive disk (24) is slidably connected inside the fine adjustment sleeve (23), the compensation rod (27) is slidably connected in the through hole opened on the surface of the drive disk (24), and one end of the compensation rod (27) passes through the drive disk (24) and is connected to the compensation plate (25).

3. A low-leakage plunger valve with pressure compensation function according to claim 1, characterized in that: The compensation spring (28) is sleeved on one end of the compensation rod (27), and one end of the compensation spring (28) is connected to the compensation plate (25), while the other end of the compensation spring (28) is connected to the drive disk (24).

4. A low-leakage plunger valve with pressure compensation function according to claim 1, characterized in that: The two sealing strips (26) are symmetrically embedded inside the compensation plate (25) and fit against the inner wall of the compensation box (21).

5. A low-leakage plunger valve with pressure compensation function according to claim 1, characterized in that: The threaded rod (29) is threaded into the threaded hole on the surface of the fine adjustment sleeve (23), and one end of the threaded rod (29) passes through the fine adjustment sleeve (23) and is rotatably connected to the drive disc (24).

6. A low-leakage plunger valve with pressure compensation function according to claim 1, characterized in that: The two pressure detection modules (32) are respectively installed at the inlet and outlet ends of the plunger valve body (1).

7. A low-leakage plunger valve with pressure compensation function according to claim 1, characterized in that: The controller (33) is installed on the outer side of the compensation box (21) and is electrically connected to the alarm (31) and the pressure detection module (32) respectively.

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