Quick replacement device and method for valve element sealing element of high-pressure piston type pressure reducing valve

Abstract

The invention discloses a quick replacement device for a valve element sealing piece 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 invention further discloses a quick replacement method for the valve element sealing element of the high-pressure piston type pressure reducing valve. The quick replacement method comprises the steps that the pressure reducing valve is arranged on the adaptive seat; the pressing handle applies downward pressure, the sealing piece is separated from the locking nut, the locking nut is detached, and a new sealing piece is replaced; and the locking nut is installed again, the pressing handle applies downward pressure, the pressure reducing valve rod overcomes the elastic force of the spring to move downwards into the pressure reducing valve element, and the locking nut is screwed to the upper end of the pressure reducing valve element. The replacement efficiency of the valve element sealing piece can be greatly improved, and the valve element sealing piece has wide application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure pipeline accessories, and in particular relates to a device and method for quickly replacing a valve core seal of a high-pressure piston pressure reducing valve. Background Art

[0002] Plasma arc heater is a large-scale ground simulation experimental device that uses electric arc to heat gas to produce airflow with a temperature of several thousand to tens of thousands of Kelvin. It is used to simulate the heating process of the aircraft by the compressed high-temperature gas in front of the aircraft during ultra-high-speed flight. It is especially used to measure the performance of thermal protection materials and thermal protection systems. It is almost the only experimental tool so far that can continuously produce airflow temperature and pressure close to that in real flight, and plays an important role in the aerospace industry.

[0003] During the test of 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. The high-pressure piston pressure reducing valve has the advantages of high pressure regulation accuracy and fast response speed, and is widely used in the heater working gas supply system.

[0004] The main structures of the high-pressure piston pressure reducing valve include the outer shell, valve core, top cover, etc., among which the seal of the valve core is made of hard plastic. However, during the pressure reducing process of the pressure reducing valve, the seal of the valve core will be continuously cavitated by the upstream high-pressure gas medium. At the same time, each time the pressure reducing valve is opened and closed, the valve core seal will be continuously squeezed with the sealing surface of the locking nut to cause deformation. In addition, there is also the situation that impurities in the gas erode the seal. Therefore, after a period of use, the seal of the valve core will fail, and the valve core seal of the pressure reducing valve needs to be replaced regularly or irregularly. However, since the spring structure is used in the valve core to compress the sealing surface, the spring force is very large, at the MPa level. Each time the seal is replaced, two people are required to cooperate. One person squeezes the center valve stem hard to offset the elastic force of the spring, and the other person quickly matches the locking nut with the thread of the valve core housing to lock it. However, since the force is applied manually, the valve stem is prone to tilt when the center valve stem is squeezed, which affects the assembly of the locking nut. The seal replacement process is time-consuming and laborious. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects and provide a device and method for quickly replacing the valve core seal of a high-pressure piston pressure reducing valve, which solves the technical problem that the replacement of the existing high-pressure piston pressure reducing valve seal is time-consuming and labor-intensive. The present invention can greatly improve the efficiency of replacing the valve core seal and has a wide range of application prospects.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] A high-pressure piston pressure reducing valve core seal quick replacement device, comprising: a suspension, an adapter seat and a pressure handle;

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

[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 handle is installed on the door beam of the suspension and is used to apply force to the valve stem of the pressure reducing valve.

[0011] Further, it also includes a first clamping rod and a second clamping rod;

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

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

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

[0017] The pressure handle 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.

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

[0019] Furthermore, the first clamping rod and the second clamping rod are round rods with threads, and threaded holes are respectively provided on the two brackets of the suspension. The direction of the threaded holes is perpendicular to the side of the valve core of the pressure reducing valve. The round rods are screwed in or out of the threaded holes to clamp or release the two sides of the valve core of the pressure reducing valve.

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

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

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

[0023] A method for quickly replacing a valve core seal of a high-pressure piston pressure reducing valve is implemented by using the above-mentioned device for quickly replacing a valve core seal of a high-pressure piston pressure reducing valve, comprising:

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

[0025] S2 tightens the first clamping rod and the second clamping rod to fix the valve core of the pressure reducing valve;

[0026] The S3 pressure handle applies downward pressure to the valve stem of the pressure reducing valve, and the valve stem of the pressure reducing valve overcomes the elastic force of the spring to drive the seal to move downward, thereby separating the seal from the locking nut;

[0027] S4 Remove the locking nut connected to the upper end of the pressure reducing valve core and replace the new seal;

[0028] S5 Reinstall the locking nut, and use the pressure handle to apply downward pressure to the valve stem of the pressure reducing valve. The valve stem of the pressure reducing valve overcomes the elastic force of the spring and moves downward to the inside of the valve core of the pressure reducing valve. Tighten the locking nut to the upper end of the valve core of the pressure reducing valve.

[0029] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0030] (1) The present invention discloses a high-pressure piston pressure reducing valve core seal quick replacement device, which can eliminate the adverse effects of replacing the pressure reducing valve seal by hand, which is difficult to position and install incorrectly, and can effectively improve the positioning accuracy, thereby improving the replacement efficiency;

[0031] (2) The present invention can solve the technical problem that it is difficult to manually replace the seal of the pressure reducing valve, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a device for quickly replacing a valve core seal of a high-pressure piston pressure reducing valve according to the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the adapter seat of the present invention;

[0034] Figure 3 It is a structural schematic diagram of the valve core of the high-pressure piston pressure reducing valve.

[0035] In the figure, 1-suspension, 2-adapter seat, 3-pressure handle, 4-first clamping rod, 5-second clamping rod, 6-pressure reducing valve, 6-1-valve stem, 6-2-locking nut, 6-3-seal, 6-4-valve core, 6-5-valve stem base, 6-6-spring. DETAILED DESCRIPTION

[0036] The following detailed description of the present invention will make the features and advantages of the present invention more clear and explicit.

[0037] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0038] The pressure reducing seal of the high-pressure piston pressure reducing valve is a wearing part and needs to be replaced frequently. However, due to the specific structure of the pressure reducing valve, it is difficult to replace the seal completely by manual means. The present invention provides a high-pressure piston pressure reducing valve core seal quick replacement device, which solves the problem of the difficulty in replacing the high-pressure piston pressure reducing valve seal.

[0039] like Figure 3 The structure and working principle of the high-pressure piston pressure reducing valve involved in the present invention are as follows: The high-pressure piston pressure reducing valve includes a valve stem 6-1, a locking nut 6-2, a seal 6-3, a valve core 6-4, a valve stem base 6-5, and a spring 6-6. When the valve stem 6-1 does not apply a driving force, the valve core 6-4 drives the valve core seal 6-3 and the sealing surface of the locking nut 6-2 to be firmly pressed together under the action of the spring 6-6, and is in a static sealing state. A certain driving force is applied to the valve stem, and the seal 6-3 and the locking nut 6-2 are opened to a certain degree. At the moment when the high-pressure gas enters the gas transmission channel, 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 overcome the spring force and rise. The rise of the valve core reduces the opening amount of the valve port, improves the pressure reduction capacity, and reduces the output pressure. After this continuous self-adjustment, a balance of force is achieved, thereby achieving the goal of stable pressure reduction.

[0040] like Figure 1 The present invention discloses a high-pressure piston pressure reducing valve core seal quick replacement device, comprising: a suspension 1, an adapter seat 2, a pressure handle 3, a first clamping rod 4, and a second clamping rod 5;

[0041] The suspension 1 is a door-shaped structure, including a door beam and a bracket. The bracket of the suspension 1 extends into the positioning grooves at both ends of the adapter seat 2. The two parts are connected by welding so that the threaded hole at the top of the suspension is coaxial with the center of the adapter seat 2.

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

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

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

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

[0046] The pressure handle 3 can be easily moved up and down through the threaded hole at the top of the suspension 1 to squeeze the valve stem parts 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 handle is 2-5mm.

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

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

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

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

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

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

[0054] ④Spin the pressure rod downward to apply pressure, screw and install the locking nut 6-2, and the valve core sealing ring is replaced.

[0055] Example:

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

[0057] The bracket of the suspension 1 extends into the positioning grooves at both ends of the adapter seat 2, and the two parts are connected by welding so that the threaded hole of the suspension is concentric with the center of the adapter seat 2;

[0058] The pressure handle 3 is welded by a single bolt and a force lever;

[0059] The suspension 1 is connected to the pressure handle 3 by threads;

[0060] The first clamping rod 4 and the second clamping rod 5 are threadedly connected to the two arms (ie, two brackets) of the suspension 1 to fix the valve core 9 to prevent left and 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 in a straight line.

[0062] The valve core equipped with the sealing member 6 - 3 can smoothly enter the positioning groove of the adapter seat 2 without shaking left or 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 to prevent it from moving left and right.

[0064] The pressure handle 3 can be easily moved 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 pressure reducing valve using the above device comprises 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 matches the valve core groove of the adapter seat 2;

[0067] The S2 pressure handle 3 applies downward pressure to the valve stem of the pressure reducing valve, and the valve stem of the pressure reducing valve overcomes the elastic force of the spring to drive the seal to move downward, thereby separating the seal from the locking nut;

[0068] S3 removes the locking nut connected to the upper end of the valve core of the pressure reducing valve; and removes 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 tighten the valve stem 6-1 and the valve stem base 6-5 into place with a wrench until there is no gap between the seal and the upper and lower parts;

[0070] S5: placing the assembly completed in step S4 into the valve core 6-4 and putting on the locking nut 6-2;

[0071] S6 places the assembly to be assembled in step S5 into the positioning groove of the adapter seat 2, and then squeezes the valve stem 6-1 by operating the pressure handle 3 to overcome the spring force at the bottom, and then easily screws the locking nut into the thread of the valve core 6-4, connects the locking nut to the valve core, and finally completes the replacement of the seal.

[0072] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0073] The contents not described in detail in the specification of the present invention belong to the common knowledge 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.

10. A method for quickly replacing a valve core seal of a high-pressure piston pressure reducing valve, characterized in that: The high-pressure piston pressure reducing valve core seal quick replacement device is implemented by using any one of claims 1 to 9, comprising: S1: Place the pressure reducing valve on the adapter seat (2) so that the bottom of the valve core of the pressure reducing valve fits into the valve core groove of the adapter seat (2); S2 fixed pressure reducing valve core; The pressure applying handle S3 (3) applies downward pressure to the valve stem of the pressure reducing valve, and the valve stem of the pressure reducing valve overcomes the elastic force of the spring to drive the seal to move downward, thereby separating the seal from the locking nut; S4 Remove the locking nut connected to the upper end of the pressure reducing valve core and replace the new seal; S5 Reinstall the locking nut, and use the pressure handle (3) to apply downward pressure to the valve stem of the pressure reducing valve. The valve stem of the pressure reducing valve overcomes the elastic force of the spring and moves downward to the inside of the valve core of the pressure reducing valve. Tighten the locking nut onto the upper end of the valve core of the pressure reducing valve.

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