Piston structure of high-temperature deflation valve

Abstract

The utility model discloses a piston structure of a high-temperature air bleed valve, and relates to the technical field of air bleed valves. The piston assembly comprises an upper piston and a lower piston, the upper end of the lower piston extends into the upper piston from bottom to top and is in threaded connection with the upper piston, and the upper end face of the lower piston is flush with the upper end face of the upper piston. The split type piston structure is adopted, the upper piston and the lower piston are in threaded connection, only the upper piston can be replaced after the sealing end face of the upper end of the upper piston is abraded, maintainability is improved, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of air release valves, more specifically to a piston structure of a high-temperature air release valve. Background Art

[0002] The bleed valve adjusts the valve opening according to the instructions of the controller to bleed the compressor to prevent compressor surge; all engines need to be installed with a bleed valve to prevent surge; the piston is installed in the actuating chamber and is an important part of the valve moving pair. It is required to withstand the force of air pressure at both ends and work smoothly under high temperature and high pressure conditions.

[0003] At present, the piston structure of similar products abroad is as follows: Figure 2 As shown, in actual use, this structure is prone to form vortices in the valve flow channel, reducing the exhaust flow, which is not conducive to valve exhaust and is prone to howling. In addition, the piston is an end face sealing structure when used in the fully closed position. Long-term use will cause wear and tear, which will affect the product's sealing and the measurement value of the displacement sensor. This wear and tear cannot be repaired and can only be scrapped, increasing the production and use costs of manufacturers and customers.

[0004] Therefore, it is necessary to develop a piston structure of a high-temperature exhaust valve with repairability, reduced possibility of whistling and increased exhaust flow. Summary of the invention

[0005] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and provide a piston structure of a high-temperature exhaust valve.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is: a piston structure of a high-temperature exhaust valve, characterized in that it includes a piston assembly installed in the exhaust valve, the piston assembly includes an upper piston and a lower piston, the upper end of the lower piston extends from bottom to top into the upper piston and is threadedly connected to the upper piston, and the upper end surface of the lower piston is flush with the upper end surface of the upper piston.

[0007] In the above technical solution, a locking pin is provided at the threaded connection between the lower piston and the upper piston.

[0008] In the above technical solution, the upper end surface of the upper piston is an inclined surface extending downward from the center.

[0009] Compared with the prior art, the utility model has the following advantages:

[0010] 1) The piston structure of the utility model adopts a split type, and the upper piston and the lower piston are connected by threads. When the upper sealing end surface of the upper piston is worn, only the upper piston can be replaced, thereby improving maintainability and reducing costs.

[0011] 2) In order to strengthen the anti-loosening design, the utility model is designed with a locking pin. After the upper piston and the lower piston are installed in place, a hole is made and the locking pin is inserted into the hole to prevent the upper piston from loosening.

[0012] 3) The upper piston of the utility model is designed to be flow-guiding, and the airflow through the flow channel is smooth, making the deflation smoother and reducing the possibility of howling, thereby effectively increasing the deflation volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the piston structure in the utility model.

[0014] Figure 2 It is a structural schematic diagram of a piston structure in the prior art.

[0015] Figure 3 The figure is a diagram showing the installation status of the piston assembly in the exhaust valve in the prior art.

[0016] Among them, 1-deflation valve, 2-piston assembly, 21-upper piston, 22-lower piston, 221-step, 3-lock pin. DETAILED DESCRIPTION

[0017] The following is a detailed description of the implementation of the utility model in conjunction with the accompanying drawings, but they do not constitute a limitation of the utility model and are only used as examples. At the same time, the advantages of the utility model will become clearer and easier to understand through the description.

[0018] Referring to the attached drawings, it can be seen that a piston structure of a high-temperature exhaust valve is characterized in that it includes a piston assembly 2 installed in the exhaust valve 1, the piston assembly 2 includes an upper piston 21 and a lower piston 22, the upper end of the lower piston 22 extends from bottom to top into the upper piston 21 and is threadedly connected to the upper piston 21, and the upper end surface of the lower piston 22 is flush with the upper end surface of the upper piston 21; the lower piston 22 is provided with a step 221, and the diameter of the lower piston 22 above the step 221 is smaller than the diameter below the step 221; the middle part of the upper piston 21 is sleeved on the lower piston 22 above the step 221, and is threadedly connected to the upper piston 21.

[0019] A locking pin 3 is provided at the threaded connection between the lower piston 22 and the upper piston 21 .

[0020] The upper end surface of the upper piston 21 is an inclined surface extending downward from the center, and the umbrella-like structure of the upper piston 21 has a flow-guiding effect.

[0021] In actual use, the split structure allows the piston assembly 2 to be repaired, thereby improving maintainability; the cost of raw materials and processing hours for reprocessing the upper piston 21 is much lower than replacing a new piston, which also greatly improves the economy of the product.

[0022] The installation state of the piston assembly 2 in the exhaust valve 1 of the prior art is as follows: Figure 3 As shown, the piston assembly 2 of the utility model can be replaced in situ without affecting the original functional performance of the product.

[0023] Other parts not described belong to the prior art.

Claims

1. A piston structure of a high temperature exhaust valve, characterized in that: The invention comprises a piston assembly (2) installed in a deflation valve (1), wherein the piston assembly (2) comprises an upper piston (21) and a lower piston (22), wherein the upper end of the lower piston (22) extends from bottom to top into the upper piston (21) and is threadedly connected to the upper piston (21), and the upper end surface of the lower piston (22) is flush with the upper end surface of the upper piston (21).

2. The piston structure of a high temperature exhaust valve according to claim 1, characterized in that: A locking pin (3) is provided at the threaded connection between the lower piston (22) and the upper piston (21).

3. The piston structure of a high temperature exhaust valve according to claim 1, characterized in that: The upper end surface of the upper piston (21) is an inclined surface extending downward from the center.

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