CN205047848U - Air film seal spring formula structure for cryogenic pump - Google Patents

Abstract

The utility model provides a gas film seal spring type structure for a low temperature pump, which mainly consists of a moving ring gasket (1), a moving ring (2), a moving ring compression sleeve (3), a static ring (4), a push ring (5), shaft sleeve (6), spring energy sealing ring 1 (7), gland (8), hex head screw (9), throttle ring (10), manifold (11), hex nut ( 12), double-ended stud (13), hexagon socket head cap screw (14), wear-resistant sleeve (15), spring (16), spring energy storage sealing ring 2 (17), sealing box (18), shaft sleeve O-ring (19) at the place and O-ring (20) at the sealing box. Beneficial effects of the utility model: according to the characteristics of the cryopump, an air film spring seal is provided. The air film seal spring type has a simple structure, is easy to install and disassemble, and solves the problems existing in the original common contact seal.

Description

A gas film seal spring type structure for a cryopump

technical field

The utility model relates to the technical field of gas film sealing, in particular to a gas film sealing spring type structure for a cryogenic pump.

Background technique

Cryogenic pumps are special pumps used to transport cryogenic liquids in petroleum, air separation and chemical plants. Its purpose is to transport cryogenic liquids from places with low pressure to places with high pressure. Due to the low temperature of the medium and the change of the operating environment, the conventionally used ordinary contact mechanical seal often suffers from medium leakage. In view of the above problems, a sealing structure capable of improving sealing reliability and safety is required.

Contents of the invention

The purpose of this utility model is to overcome the above defects and provide a gas film seal spring type structure for cryopumps. Shaft sleeve, spring energy storage seal ring 1, gland, hexagon head screw, throttle ring, manifold, hexagon nut, stud, hexagon socket head screw, wear sleeve, spring, spring energy storage seal ring 2. The sealing box, the O-ring at the shaft sleeve and the O-ring at the sealing box are composed. A hydrodynamic pressure groove is set on the end face of the moving ring seal, the moving ring and the moving ring gasket are fixed on the shaft sleeve by the moving ring compression sleeve, the static ring is in contact with the moving ring with a hydrodynamic pressure groove, and the spring energy storage sealing ring is installed At the push ring, a grinding sleeve is installed at the push ring and the static ring. The spring energy storage sealing ring is used to seal between the push ring and the sealing box. The spring is a compensation part made of low temperature resistant material. It can maintain good compensation. It is installed in the spring hole on the sealing box to contact the push ring. The gland and the sealing box are connected by hexagon socket head screws. The throttle ring is installed in the groove of the gland. The head screw is fixed on the gland, and at the same time, it is stuck in the snap ring groove in the shaft sleeve. The whole set of air film seal is fixed on the body through the hex nut and the stud. The O-ring 19 at the shaft sleeve and the O-ring of the sealing box 20 all adopt the material of low temperature resistance, and the O-ring 19 at the shaft sleeve is installed between the shaft and the shaft sleeve 2 to seal; the O-ring 20 at the seal box is installed between the seal box 18 and the body to seal.

Beneficial effects of the utility model: according to the characteristics of the cryopump, a gas film spring seal is provided. The spring structure of the gas film seal is simple, easy to install and disassemble, and solves the problems existing in the original common contact seal.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

As shown in Figure 1, a gas film seal structure for a cryopump is mainly composed of a moving ring gasket 1, a moving ring 2, a moving ring compression sleeve 3, a static ring 4, a push ring 5, a shaft sleeve 6, and a spring. Seal ring 17, gland 8, hex head screw 9, throttle ring 10, manifold 11, hex nut 12, stud 13, hexagon socket head screw 14, wear-resistant sleeve 15, spring 16, spring The energy storage seal ring two 17, the sealing box 18, the O-ring 19 at the shaft sleeve and the O-ring 20 at the sealing box are formed. The sealing end surface of the moving ring 2 is provided with a liquid dynamic pressure groove, and the moving ring 2 and the moving ring gasket 1 are fixed on the shaft sleeve by the moving ring compression sleeve 3, which is a rotating part. The static ring 4 is in contact with the dynamic ring 2 with the fluid dynamic pressure groove, the spring energy storage seal ring 2 17 is installed on the push ring 5, the push ring 5 and the static ring 4 are equipped with a grinding sleeve 15, and the push ring 5 is connected to the seal The spring energy-storage sealing ring-7 is used to seal between the boxes 15. The spring 16 is made of low-temperature-resistant material for the compensation part, which can maintain good compensation in low-temperature and ultra-low temperature media, and is installed in the spring hole on the sealing box 15. In contact with the push ring 5, the gland 8 and the sealing box 18 are connected by hexagon socket head cap screws 14, and the throttle ring 10 is installed in the groove of the gland 8, which is a stationary part. Fit the 4 faces of the static ring and the 2 faces of the moving ring of the stationary part, and the assembly piece 11 is fixed on the gland 8 through the hexagon head screw 9, and is stuck in the snap ring groove in the shaft sleeve 6 at the same time, and the whole set of air film seals through The hex nut 12 and stud 13 are fixed on the machine body, the O-ring 19 at the shaft sleeve and the O-ring 20 of the sealing box are made of low temperature resistant material, the O-ring 19 at the sleeve is installed between the shaft and the sleeve 2 The sealing function is played between; the O-ring 20 at the sealing box is installed between the sealing box 18 and the body to play a sealing role.

The air film seal adopts a balanced type and a static spring arrangement. The moving ring 2 adopts compression transmission, the spring energy storage sealing ring 2 17 is installed at the push ring 5, and the sealing function between the starting ring 2 and the push ring 5; the spring energy storage sealing ring is used between the push ring 5 and the sealing box 15 A 7 acts as a seal, the sealing surface of the moving ring 2 is wide, and a fluid dynamic pressure groove is set up, which is the basis for the formation of the gas film seal; the spring 16 is made of low temperature resistant material for the compensation part, which can maintain good performance in low temperature and ultra-low temperature media Compensation, installed in the spring hole on the sealing box 15 and in contact with the push ring 5; the O-ring 19 at the shaft sleeve and the O-ring 20 of the sealing box are made of low temperature resistant materials, and the O-ring 19 at the shaft sleeve is installed on the shaft It plays a sealing role with the shaft sleeve 2; the O-ring 20 at the sealing box is installed between the sealing box 18 and the body to play a sealing role; the assembly piece 11 fixes the working height of the spring 16, and the assembly design is easy to install on site and disassembly.

Claims (4)

1. A gas film seal spring type structure for a cryogenic pump, characterized in that: a liquid dynamic pressure groove is provided on the sealing end surface of the moving ring (2), and the moving ring (2) and the moving ring gasket (1) are pressed by the moving ring compression sleeve (3) Fixed on the shaft sleeve, the static ring (4) is in contact with the dynamic ring (2) with the hydrodynamic pressure groove, the second spring energy storage sealing ring (17) is installed at the push ring (5), and the push ring ( 5) and the static ring (4) are installed with a grinding sleeve (15), between the push ring (5) and the sealing box (15) is sealed by the spring energy sealing ring one (7), and the spring (16) is installed It is in contact with the push ring (5) in the spring hole on the sealing box (15), the gland (8) and the sealing box (18) are connected by hexagon socket head cap screws (14), and the throttle ring (10) is installed on the pressure Fit the surface of the static ring (4) and the surface of the moving ring (2) of the stationary part in the groove of the cover (8), and fix the assembly piece (11) on the gland (8) with the hexagon head screw (9). At the same time, it is stuck in the snap ring groove in the shaft sleeve (6), and the whole set of air film seal is fixed on the body through the hex nut (12) and the stud (13), and the O-ring (19) at the shaft sleeve is installed on the shaft It plays a sealing role with the shaft sleeve (2), and the O-ring (20) at the sealing box is installed between the sealing box (18) and the body to play a sealing role. 2. The gas film seal spring type structure for a cryopump according to claim 1, characterized in that: the spring (16) is made of low temperature resistant material. 3. The air film seal spring type structure for a cryopump according to claim 1, characterized in that: the O-ring (19) at the shaft sleeve is made of low temperature resistant material. 4. The gas film seal spring type structure for a cryopump according to claim 1, characterized in that: the O-ring (20) at the sealing box is made of low temperature resistant material.