Quick replacing device for valve element sealing element of high-pressure piston type pressure reducing valve

Abstract

The utility model discloses a quick replacement device for a valve core sealing element of a high-pressure piston type pressure reducing valve. The quick replacement device comprises a suspension, an adaptive seat and a pressure applying handle, a valve element groove used for being matched with the bottom of a valve element of the pressure reducing valve is formed in the adaptation base. The suspension comprises a support and a door beam. The lower ends of the two brackets are fixedly connected with the adaptive seat, and the upper ends of the two brackets support the door beam; the pressure applying handle is installed on a door beam of the suspension and used for applying force to a valve rod of the pressure reducing valve. The valve element sealing piece replacement efficiency can be greatly improved, and the valve element sealing piece replacement device has wide application prospects.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure pipeline accessories, and particularly relates to a device for quickly replacing a sealing element of a spool of a high-pressure piston type pressure reducing valve. Background Technique

[0002] A plasma arc heater is a large-scale ground simulation experimental device that uses an arc to heat a gas to generate a gas flow with a temperature ranging from several thousand Kelvin to over ten thousand Kelvin. It is used to simulate the heating process of a high-temperature gas compressed in front of an aircraft during hypersonic flight, especially to measure the performance of thermal protection materials and thermal protection systems. It is almost the only experimental tool that can continuously generate gas flow temperatures and pressures close to those in real flight so far, and plays an important role in the aerospace industry.

[0003] During the test of a plasma arc heater, it is necessary to adjust the amount of working gas entering the heater. The main method used is to adjust the intake pressure by fixing the intake cross-section to adjust the working gas flow rate. The high-pressure piston type pressure reducing valve has the advantages of high pressure regulation accuracy and fast response speed, and is widely used in the working gas supply system of the heater.

[0004] The main structure of the high-pressure piston type pressure reducing valve includes a housing, a spool, a top cover, etc. The sealing element of the spool is made of hard plastic. However, during the pressure reduction process of the pressure reducing valve, the sealing element of the spool is continuously eroded by the upstream high-pressure gas medium. At the same time, each time the pressure reducing valve opens and closes, the sealing element of the spool will also be continuously squeezed by the sealing surface of the lock nut, resulting in deformation. In addition, there is also the situation where impurities in the gas erode the sealing element. Therefore, after a period of use, the seal of the spool will fail, and it is necessary to replace the sealing element of the spool of the pressure reducing valve regularly or irregularly. However, due to the use of a spring structure in the spool to press the sealing surface, the spring force is very large, reaching the megapascal level. Each time the sealing element is replaced, two people need to cooperate. One person exerts force to squeeze the central valve stem to offset the spring force, and the other person quickly pairs the threads of the lock nut and the spool housing to lock them. However, due to manual force application, the valve stem is prone to tilt when squeezing the central valve stem, affecting the assembly of the lock nut, and the process of replacing the sealing element is time-consuming and laborious. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the above-mentioned defects, provide a device for quickly replacing a sealing element of a spool of a high-pressure piston type pressure reducing valve, and solve the technical problem that the replacement of the sealing element of the existing high-pressure piston type pressure reducing valve is time-consuming and laborious. The utility model can greatly improve the efficiency of replacing the sealing element of the spool and has a wide application prospect.

[0006] To achieve the above-mentioned utility model purpose, the utility model provides the following technical solutions:

[0007] A rapid replacement device for the valve core seal of a high-pressure piston type pressure reducing valve, comprising: a suspension, an adapter seat and a pressure application handle;

[0008] The adapter seat is provided with a valve core groove for cooperating with the bottom of the pressure reducing valve core;

[0009] The suspension includes a bracket and a door beam; the lower ends of the two brackets are fixedly connected to the adapter seat, and the upper ends of the two brackets support the door beam;

[0010] The pressure application handle is installed on the door beam of the suspension for applying force to the valve stem of the pressure reducing valve.

[0011] Furthermore, it further includes a first clamping rod and a second clamping rod;

[0012] The first clamping rod and the second clamping rod are respectively installed on the two brackets of the suspension for clamping both sides of the pressure reducing valve core.

[0013] Furthermore, the adapter seat is provided with a number of valve core grooves of different sizes, and the valve core grooves of different sizes are adapted to different specifications of the pressure reducing valve cores;

[0014] The valve core groove is a hexagonal groove.

[0015] Furthermore, the lower ends of the two brackets of the suspension are welded to the adapter seat.

[0016] Furthermore, the door beam of the suspension is provided with bolt holes;

[0017] The pressure application handle is of a T-shaped rod structure, the vertical rod part of the T-shaped rod structure is provided with threads for cooperating with the bolt holes, and the bottom end of the vertical rod part is provided with a groove for cooperating with the upper end of the valve stem of the pressure reducing valve.

[0018] Furthermore, the depth of the groove provided at the bottom end of the vertical rod part is 2 - 5 mm.

[0019] Furthermore, the first clamping rod and the second clamping rod are round rods processed with threads, and the two brackets of the suspension are respectively provided with threaded holes, the direction of the threaded holes is perpendicular to the side surface of the pressure reducing valve core, and the round rods are clamped or released on both sides of the pressure reducing valve core by screwing in or out in the threaded holes.

[0020] Furthermore, the distance from the central axis of the threaded hole to the bottom end surface of the bracket is 10 - 20 mm;

[0021] The thickness of the bracket and the door beam in the suspension is 8 - 15 mm.

[0022] Furthermore, the pressure reducing valve core, the suspension and the adapter seat placed on the adapter seat are coaxial.

[0023] A rapid replacement method for the valve core seal of a high-pressure piston type pressure reducing valve, realized by using the above rapid replacement device for the valve core seal of a high-pressure piston type pressure reducing valve, includes:

[0024] S1 Place the pressure reducing valve on the adapter seat so that the bottom of the pressure reducing valve spool fits into the spool groove of the adapter seat;

[0025] S2 Tighten the first clamping rod and the second clamping rod to fix the pressure reducing valve spool;

[0026] S3 Apply a downward pressure to the valve stem of the pressure reducing valve with the pressure application handle. The valve stem of the pressure reducing valve overcomes the elastic force of the spring and drives the seal to move downward, realizing the separation of the seal from the lock nut;

[0027] S4 Remove the lock nut connected to the upper end of the pressure reducing valve spool and replace it with a new seal;

[0028] S5 Reinstall the lock nut. Apply a downward pressure to the valve stem of the pressure reducing valve with the pressure application handle. The valve stem of the pressure reducing valve overcomes the elastic force of the spring and moves downward into the pressure reducing valve spool, and tighten the lock nut on the upper end of the pressure reducing valve spool.

[0029] The utility model has at least one of the following beneficial effects compared with the prior art:

[0030] (1) The utility model discloses a device for quickly replacing the seal of a high-pressure piston type pressure reducing valve spool, which can eliminate the adverse effects of replacing the seal of the pressure reducing valve by hand, is not easy to be misaligned during positioning and installation, can effectively improve the positioning accuracy, and thus improve the replacement efficiency;

[0031] (2) The utility model can solve the technical problem that it is rather laborious to replace the seal of the pressure reducing valve manually, and reduces the production cost. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of a device for quickly replacing the seal of a high-pressure piston type pressure reducing valve spool of the utility model;

[0033] Figure 2 is a schematic structural diagram of the adapter seat of the utility model;

[0034] Figure 3 is a schematic structural diagram of a high-pressure piston type pressure reducing valve spool.

[0035] In the figure, 1 - suspension, 2 - adapter seat, 3 - pressure application handle, 4 - first clamping rod, 5 - second clamping rod, 6 - pressure reducing valve, 6-1 - valve stem, 6-2 - lock nut, 6-3 - seal, 6-4 - spool, 6-5 - valve stem base, 6-6 - spring. Detailed Embodiments

[0036] The following is a detailed description of the utility model, and the features and advantages of the utility model will become clearer and more definite with these descriptions.

[0037] As used herein, the term "exemplary" means "serving as an example, embodiment, or illustration". Any embodiment described herein as "exemplary" is not necessarily to be construed as superior or better than other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings do not have to be drawn to scale unless otherwise specified.

[0038] As a vulnerable part, the decompression seal of the high-pressure piston type pressure reducing valve needs to be replaced frequently. However, due to the specific structure of the pressure reducing valve, it is difficult to replace the seal manually. The utility model provides a device for quickly replacing the valve core seal of the high-pressure piston type pressure reducing valve, which solves the problem of difficult replacement of the seal of the high-pressure piston type pressure reducing valve.

[0039] As Figure 3 , the structure and working principle of the high-pressure piston type pressure reducing valve involved in the utility model are as follows: The high-pressure piston type pressure reducing valve includes a valve stem 6-1, a lock nut 6-2, a seal 6-3, a valve core 6-4, a valve stem base 6-5, and a spring 6-6. When no driving force is applied to the valve stem 6-1, the valve core 6-4 drives the valve core seal 6-3 to firmly press against the sealing surface of the lock nut 6-2 under the action of the spring 6-6, being in a static sealing state. When a certain driving force is applied to the valve stem, the seal 6-3 and the lock nut 6-2 open a certain opening. When high-pressure gas enters the gas transmission channel instantaneously, a part of the gas enters the bottom of the spring, and the pressure at the bottom of the spring increases, causing the valve core to rise against the spring force. The rise of the valve core reduces the opening amount of the valve port, improves the decompression ability, and reduces the output pressure. Through this continuous self-adjustment, the balance of forces is achieved, thereby realizing the goal of stable decompression.

[0040] As Figure 1 , the utility model discloses a device for quickly replacing the valve core seal of a high-pressure piston type pressure reducing valve, which includes: a suspension 1, an adapter seat 2, a pressure application handle 3, a first clamping rod 4, and a second clamping rod 5;

[0041] The suspension 1 is of a portal structure, including a portal beam and brackets. The brackets of the suspension 1 extend into the positioning grooves at both ends of the adapter seat 2, and the two components are connected by welding, making the threaded hole at the top of the suspension coaxial with the center of the adapter seat 2;

[0042] As Figure 2 , the adapter seat is of a disc structure, with grooves of a certain depth at both ends for positioning the brackets of the suspension 1, and two hexagonal notches with different sizes in the center for adapting to valve cores of two specifications of the pressure reducing valve;

[0043] The pressure application handle 3 is of a T-shaped rod structure, and the vertical rod is of a threaded rod structure, which is cooperatively connected with the bolt hole at the top of the suspension 1. A groove is machined at the bottom of the vertical rod, and the groove cooperates with the valve stem 6-1;

[0044] The first clamping rod 4 and the second clamping rod 5 are round rods with threads machined at one end, and are respectively connected to the threaded holes at the bottoms of the two brackets of the suspension 1 to apply force to the entire replacement device when the pressure - applying handle 3 is spun, so as to fix the valve core to prevent rotation.

[0045] The valve core equipped with the seal 6 - 3 should be coaxial with the centers of the suspension 1 and the adapter seat 2.

[0046] The pressure - applying handle 3 can move up and down easily through the threaded hole at the top of the suspension 1 to squeeze the valve stem component of the valve core 6 - 4 to complete the replacement of the seal 6 - 3.

[0047] The depth of the groove at the bottom of the vertical rod of the pressure - applying handle is 2 - 5 mm.

[0048] The distance between the central axis of the threaded hole on both sides of the suspension 1 and the bottom end face of the bracket is 10 - 20 mm.

[0049] The thickness of the suspension 1 is 8 - 15 mm.

[0050] The working process of using the above - mentioned high - pressure piston - type pressure - reducing valve valve - core seal quick - replacement device for seal replacement is as follows:

[0051] ① Put the valve core with the damaged seal into the positioning groove of the adapter seat 2;

[0052] ② Spin the pressure - applying rod downward and unscrew the locking nut 6 - 2;

[0053] ③ Unload the pressure of the pressure - applying rod, take out the valve core, and replace the seal ring;

[0054] ④ Spin the pressure - applying rod downward to apply pressure and screw on the locking nut 6 - 2 to complete the replacement of the valve - core sealing ring.

[0055] Embodiment:

[0056] As Figure 1 , in this embodiment, the high - pressure piston - type pressure - reducing valve valve - core seal quick - replacement device includes: a suspension 1, an adapter seat 2, a pressure - applying handle 3, a first clamping rod 4, and a second clamping rod 5;

[0057] The brackets of the suspension 1 extend into the positioning grooves at both ends of the adapter seat 2, and the two components are connected by welding to make the threaded hole of the suspension concentric with the center of the adapter seat 2;

[0058] The pressure - applying handle 3 is composed of a single bolt welded to a force - adding lever;

[0059] The suspension 1 and the pressure - applying handle 3 are connected by threads;

[0060] The first clamping rod 4 and the second clamping rod 5 are thread - connected to the two arms (i.e., the two brackets) of the suspension 1 to fix the valve core 9 to prevent left - right movement.

[0061] The axis of the valve core equipped with the seal 6-3, the axis of the bolt hole of the suspension 1, and the axis of the adapter seat 2 are on the same straight line.

[0062] The valve core equipped with the seal 6-3 can smoothly enter the positioning groove of the adapter seat 2 and basically does not shake left and right.

[0063] The first clamping rod 4 and the second clamping rod 5 can be freely screwed into the threads of the two brackets of the suspension 1 to clamp the valve core 6-4 and prevent it from moving left and right.

[0064] The pressure application handle 3 can easily move up and down through the threaded hole of the suspension 1 to squeeze the valve stem to complete the replacement of the seal 6-3.

[0065] The method for replacing a high-pressure piston type pressure reducing valve using the above device includes the following steps:

[0066] Step 1, place the pressure reducing valve 6 on the adapter seat 2 so that the bottom of the valve core of the pressure reducing valve fits with the valve core groove of the adapter seat 2;

[0067] S2 The pressure application handle 3 applies a downward pressure to the valve stem of the pressure reducing valve, and the valve stem of the pressure reducing valve drives the seal to move downward against the elastic force of the spring, realizing the separation of the seal from the lock nut;

[0068] S3 Remove the lock nut connected to the upper end of the valve core of the pressure reducing valve; and remove the valve core from the adapter seat 2;

[0069] S4 Place the seal 6-3 into the positioning groove of the valve stem base 6-5, and use a wrench to fasten the valve stem 6-1 and the valve stem base 6-5 in place until there is no gap between the seal and the upper and lower components;

[0070] S5 Place the assembly completed in step S4 inside the valve core 6-4 and put on the lock nut 6-2;

[0071] S6 Place the assembly to be assembled in step S5 into the positioning groove of the adapter seat 2, then operate the pressure application handle 3 to squeeze the valve stem 6-1 to overcome the spring force at the bottom, and then relatively easily screw the lock nut into the thread of the valve core 6-4 to connect the lock nut with the valve core, finally completing the replacement of the seal.

[0072] The above has described the present utility model in detail in combination with specific embodiments and exemplary examples, but these descriptions should not be construed as limitations on the present utility model. Those skilled in the art understand that without departing from the spirit and scope of the present utility model, various equivalent replacements, modifications or improvements can be made to the technical solutions and implementation manners of the present utility model, and all of these fall within the scope of the present utility model. The protection scope of the present utility model is subject to the appended claims.

[0073] The content not detailedly described in the description of this utility model belongs to the well-known technology of those skilled in the art.

Claims

1. A high-pressure piston pressure reducing valve core seal quick replacement device, characterized in that: include: Suspension frame (1), adapter seat (2) and pressure handle (3); The adapter seat (2) is provided with a valve core groove for matching with the bottom of the valve core of the pressure reducing valve; The suspension (1) comprises a bracket and a door beam; the lower ends of the two brackets are fixedly connected to the adapter seat (2), and the upper ends of the two brackets support the door beam; The pressure handle (3) is installed on the door beam of the suspension (1) and is used to apply force to the valve stem of the pressure reducing valve.

2. A high-pressure piston pressure reducing valve core seal quick replacement device according to claim 1, characterized in that: It also includes a first clamping rod (4) and a second clamping rod (5); The first clamping rod (4) and the second clamping rod (5) are respectively mounted on two brackets of the suspension (1) and are used to clamp the two sides of the valve core of the pressure reducing valve.

3. A high-pressure piston pressure reducing valve core seal quick replacement device according to claim 1, characterized in that: The adapter seat (2) is provided with a plurality of valve core grooves of different sizes, and the valve core grooves of different sizes are adapted to valve cores of pressure reducing valves of different specifications; The valve core groove is a hexagonal groove.

4. A high-pressure piston pressure reducing valve core seal quick replacement device according to claim 1, characterized in that: The lower ends of the two brackets of the suspension (1) are welded to the adapter seat (2).

5. A high-pressure piston pressure reducing valve valve core seal quick replacement device according to claim 1, characterized in that: The door beam of the suspension (1) is provided with bolt holes; The pressure handle (3) is a T-shaped rod structure, the vertical rod part of the T-shaped rod structure is provided with a thread for matching with the bolt hole, and the bottom end of the vertical rod part is provided with a groove for matching with the upper end of the valve stem of the pressure reducing valve.

6. A high-pressure piston pressure reducing valve core seal quick replacement device according to claim 5, characterized in that: The depth of the groove arranged at the bottom end of the vertical rod part is 2 to 5 mm.

7. A high-pressure piston pressure reducing valve core seal quick replacement device according to claim 2, characterized in that: The first clamping rod (4) and the second clamping rod (5) are round rods with threads. The two brackets of the suspension (1) are respectively provided with threaded holes, the directions of the threaded holes are perpendicular to the side surfaces of the valve core of the pressure reducing valve. The round rods can be screwed in or out of the threaded holes to clamp or release the two sides of the valve core of the pressure reducing valve.

8. A high-pressure piston pressure reducing valve core seal rapid replacement device according to claim 7, characterized in that: The distance between the center axis of the threaded hole and the bottom end surface of the bracket is 10 to 20 mm; The thickness of the bracket and the door beam in the suspension (1) is 8 to 15 mm.

9. A high-pressure piston pressure reducing valve core seal quick replacement device according to claim 1, characterized in that: The pressure reducing valve core, the suspension (1) and the adapter seat (2) are coaxial.

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