Fixing structure for valve element of unloading valve

Abstract

The utility model belongs to the field of unloading valves, and particularly discloses a fixing structure of a valve core of an unloading valve, which adopts the technical scheme that a groove is arranged on the outer cylindrical surface of the tail end of a piston rod, an accommodating cavity is arranged on the end surface of the tail end of the piston rod, the head of the valve core is positioned in the accommodating cavity, and a step section is arranged on the part of the valve core positioned on the outer side of the accommodating cavity. The piston rod and the valve element are connected through a clamping sleeve, and the clamping sleeve is matched with the groove of the piston rod and the step section of the valve element to fix the valve element. The connecting structure is simple, installation is more convenient, the valve element is easier to replace, the situation that the valve element is separated from the piston rod is basically avoided, and the service life of the valve element is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to unloading valve field, especially, relate to a kind of fixed structure of unloading valve valve core. BACKGROUND

[0002] The ultra-high pressure relief valve is a crucial component in the ultra-high pressure equipment container, and also a component with high failure rate. It is usually designed with pressure balance. Under the working state of the unloading valve, high-pressure fluid enters the unloading valve, and the fluid pressure acts on the valve core. When the pressure on the low-pressure side of the valve core is higher than the set pressure, the valve core moves under the action of pressure, opens the unloading valve, connects the discharge hole, and the high-pressure fluid flows out through the unloading valve. When the fluid pressure is lower than the set pressure, the valve core is restored to the original position under the action of the low-pressure side restoring force, and the valve is closed. As can be seen, the valve core, as the core component of the unloading valve, has a high frequency of use and is prone to wear and tear. Therefore, it needs to be replaced as required without affecting the use of the unloading valve.

[0003] The existing valve core and piston rod are usually pressed or inlaid. Under the impact of high-pressure fluid, the compression ring may fall off with a certain probability, resulting in the valve core separating from the piston rod. SUMMARY

[0004] To solve the problems in the prior art, the utility model provides a fixed structure of unloading valve valve core. The utility model has simple connection structure, convenient installation, and is easier to replace the valve core. The valve core is basically not separated from the piston rod, and the service life of the valve core is increased.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme: a fixed structure of unloading valve valve core, including piston rod and valve core, recess is arranged on the outer cylindrical surface of the tail end of the piston rod, and the tail end of the piston rod has a receiving cavity, the head of the valve core is located in the receiving cavity, the part of the valve core located outside the receiving cavity is provided with a stepped section, the piston rod and the valve core are connected through a sleeve, the sleeve cooperates with the recess of the piston rod and the stepped section of the valve core to fix the valve core.

[0006] Further, the sleeve includes a pressure-bearing part cooperating with the stepped section, and a hanging part cooperating with the recess is integrally formed above the pressure-bearing part.

[0007] Further, the sleeve is of split structure, and the sleeve is composed of a left sleeve and a right sleeve arranged symmetrically.

[0008] The utility model discloses a beneficial effect compared with prior art has: the utility model discloses a split type collar with valve core and piston rod fixed in an organic whole, and the split type collar bears the impact of high pressure fluid, and after the split type collar is impacted by high pressure fluid, the valve core and piston rod will be further compressed, and the situation that the valve core is separated from the piston rod basically will not appear, thereby increasing the service life of valve core. In addition, the split type collar is more easily removed when replacing the valve core, making installation and maintenance more convenient. BRIEF DESCRIPTION OF DRAWINGS

[0009] The utility model will be further explained in connection with the drawings.

[0010] Figure 1 It is the structural schematic diagram of the utility model.

[0011] Figure 2 It is the schematic diagram of piston rod clamping groove.

[0012] Figure 3 It is the structural schematic diagram of the collar.

[0013] In the drawing, 1 is piston rod, 11 is recess, 12 is accommodating cavity, 2 is valve core, 21 is step section, 3 is collar, 31 is pressure bearing part, 32 is hanging part. DETAILED DESCRIPTION

[0014] As Figures 1-2 Shown, a kind of unloading valve valve core's fixed structure, including piston rod 1 and valve core 2, the utility model mainly protects the connecting structure of piston rod 1 and valve core 2.

[0015] Piston rod 1 recess 11 is provided on the outer cylindrical surface of the tail end of piston rod, and the tail end surface of piston rod 1 has accommodating cavity 12. Valve core 2 is provided with step section 21. The head of valve core 2 is located in accommodating cavity 12, and the step of valve core 2 is located outside piston rod 1. And piston rod 1 and valve core 2 are connected by collar 3, and collar 3 cooperates with the recess 11 of piston rod and the step section 21 of valve core 2 to fix valve core 2. Collar 3 and valve core 2 are both fixed in valve body. Piston rod 1 drives collar 3 and valve core 2 to move in valve body.

[0016] As Figure 2 Shown, collar 3 includes pressure bearing part 31 cooperating with step section 21, and hanging part 32 cooperating with recess is integrally formed above pressure bearing part 31. Hanging part 32 is clamped in recess 11 of piston rod 1, and pressure bearing part 31 cooperates with step section 21. Piston rod 1 drives collar 3 to move when moving, and collar 3 drives valve core 2 to move. In this way, valve core 2 will not deviate when moving, and is more centered when moving, and the position is more accurate.

[0017] The existing compression structure is that the piston rod 1 drives the valve core 2 to move by the compression ring, the compression ring is frequently stressed, and the high-pressure fluid also impacts the compression ring, the compression ring is limited by the installation space, and the thickness and the volume are small, the compression ring is damaged after being frequently stressed, and the valve core 2 is separated.

[0018] In order that the clamping sleeve 3 is a split structure, the clamping sleeve 3 is composed of the left clamping sleeve and the right clamping sleeve which are symmetrically arranged. The clamping sleeve 3 is halved after overall machining and is used, so that the adhesion of the clamping sleeve 3 can be ensured, and there is no gap after the two are docked.

[0019] The embodiments of the utility model are described in detail in combination with the drawings above, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. A fixing structure of an unloading valve spool, comprising a piston rod (1) and a spool (2), characterized in that, The outer cylindrical surface of the tail end of the piston rod (1) is provided with a groove (11), and the tail end face of the piston rod (1) has a containing cavity (12), the head of the valve core (2) is located in the containing cavity (12), the part of the valve core (2) located outside the containing cavity (12) is provided with a stepped section (21), the piston rod (1) and the valve core (2) are connected through a clamping sleeve (3), the clamping sleeve (3) cooperates with the groove (11) of the piston rod (1) and the stepped section (21) of the valve core (2), and the valve core (2) is fixed.

2. The unloading valve spool fixing structure according to claim 1, characterized in that: The clamping sleeve (3) comprises a pressure bearing part (31) matched with the stepped section (21), and the pressure bearing part (31) is integrally formed with a hanging part (32) matched with the groove (11) above.

3. The unloading valve spool fixing structure according to claim 2, characterized in that: The clamping sleeve (3) is a split structure, and the clamping sleeve (3) is composed of a left clamping sleeve and a right clamping sleeve which are symmetrically arranged.

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