Sealing seat structure of expansion machine

Abstract

A sealing seat structure of an expansion machine belongs to the technical field of expansion machines. Comprising a sealing seat and a connecting sleeve, a sealing gas exhaust hole and a sealing gas inlet hole are formed in the inner wall of a sealing seat cavity of the connecting sleeve, and the sealing seat narrows step by step in the direction from a volute to the connecting sleeve to sequentially form a third step, a second step and a first step. When the sealing seat and the connecting sleeve are installed, the second step is arranged corresponding to the sealing gas inlet hole, the third step is arranged corresponding to the sealing gas outlet hole, and a first O-shaped sealing ring is embedded in the outer circumferential wall of the first step. A second O-shaped sealing ring is embedded in the outer circumferential wall of the second step and the side, away from the first O-shaped sealing ring, of the sealing gas inlet hole, and a third O-shaped sealing ring is embedded in the outer circumferential wall of the third step and the side, away from the second O-shaped sealing ring, of the sealing gas exhaust hole. The sealing structure has the advantages that the sealing ring can be prevented from being damaged in the mounting process, so that the sealing reliability is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of expander, specifically relates to a sealing seat structure of expander. BACKGROUND

[0002] In modern industry, turboexpander is often used in deep cryogenic equipment, and its working principle is to use working gas with certain pressure to drive the impeller on one end of the main shaft to rotate to do work and consume the internal energy of the gas itself, so that the gas itself is cooled intensively to achieve the purpose of refrigeration, and the energy of the working gas is consumed by the brake on the other end of the main shaft. Since the organic working medium is expensive and has some impact on the environment or belongs to toxic and harmful substances, the application process needs to consider maintaining the air tightness of the system and reducing the operation cost.

[0003] As known in the industry, the turboexpander must adopt oil and gas sealing measures when connecting with the external power output connecting device due to its extremely high speed during operation. Usually, the external power output connecting device is connected with the volute of the turboexpander through a connecting sleeve, and a sealing seat is arranged at the connection between the two ends of the connecting sleeve and the volute of the expander. There are many technical information about the sealing seat in the published Chinese patent documents, such as the "connecting shaft structure of the external power output connecting device of the turboexpander" disclosed in the Chinese utility model patent authorized publication No. CN202690148U, and the "ORC waste heat power generation turboexpander and high-speed motor cooperation structure" mentioned in the Chinese invention patent authorized publication No. CN112112689B. Figure 1 The existing sealing seat 1 and the connecting sleeve 2 adopt the same diameter flat sealing mode, that is, the diameters of the first O-shaped sealing ring 3 and the second O-shaped sealing ring 4 sleeved on the sealing seat 1 are the same. When installing, the sealing seat 1 is installed from left to right into the connecting sleeve 2, and in the process, the first O-shaped sealing ring 3 will pass through the sealing gas exhaust hole 21 and the sealing gas inlet hole 22 on the inner wall of the connecting sleeve 2 in turn, and the second O-shaped sealing ring 4 will pass through the sealing gas exhaust hole 21. The first O-shaped sealing ring 3 and the second O-shaped sealing ring 4 are generally flexible parts, and thus have a certain compression deformation amount. When passing through the opening position on the connecting sleeve 2, part of the first O-shaped sealing ring 3 and the second O-shaped sealing ring 4 will be trapped in the opening, and after passing through the opening position, the first O-shaped sealing ring 3 and the second O-shaped sealing ring 4 that were originally trapped in the opening position will be compressed in space and thus part of them will be sheared off, thereby damaging the cross section of the O-shaped sealing ring and even causing the O-shaped sealing ring to break, affecting the sealing effect.

[0004] In view of the above prior art, it is necessary to improve the sealing structure of the existing sealing seat, and for this purpose, the applicant has made a useful design, and the technical scheme to be introduced below is produced in this background. CONTENT OF THE UTILITY MODEL

[0005] The utility model discloses a sealing seat structure of expander can avoid the breakage of sealing ring in the installation process to improve the sealing reliability.

[0006] The utility model discloses a sealing seat structure of expander can avoid the breakage of sealing ring in the installation process to improve the sealing reliability.

[0007] In one specific embodiment of the utility model, the sealing seat is formed around the outer circumference of the second step with an air inlet groove in communication with the sealing air inlet hole, and the air inlet groove is spaced apart with sealing air inlet holes in communication with the inner cavity of the sealing seat.

[0008] In another specific embodiment of the utility model, the sealing air inlet hole is used to introduce sealing dry gas, and the sealing air outlet hole is used to export sealing dry gas and process gas.

[0009] In another specific embodiment of the utility model, the sealing dry gas is dry air or nitrogen, and the medium of the process gas is dry air or nitrogen.

[0010] The utility model discloses a sealing seat structure of expander can avoid the breakage of sealing ring in the installation process to improve the sealing reliability. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1It is the mounting structure schematic view of existing seal seat;

[0012] Figure 2 It is the whole structure schematic view of the utility model;

[0013] Figure 3 It is Figure 2 The enlarged view of A part in the middle.

[0014] In the drawing: 1. seal seat, 11. first step, 12. second step, 13. third step, 14. air inlet groove, 15. air exhaust groove,

[0015] 16. sealing gas inlet hole, 17. sealing gas outlet hole; 2. connecting sleeve, 21. sealing gas exhaust hole, 22. sealing gas inlet hole; 3. first O-shaped sealing ring; 4. second O-shaped sealing ring; 5. third O-shaped sealing ring; 6. connecting shaft, 61. carbon ring seal. DETAILED DESCRIPTION

[0016] The specific embodiments of the utility model will be described in detail below in combination with the drawings, but the description of the embodiments is not the limitation of the technical scheme, and any form but not substantial change according to the concept of the utility model should be regarded as the protection scope of the utility model.

[0017] In the following description, the concepts of directionality (or directionality) of up, down, left, right, front and back are for the position state of the figure being described, and the purpose is to facilitate the public to understand, so it cannot be understood as the special limitation of the technical scheme provided by the utility model.

[0018] Please refer to Figure 2 And Figure 3 The utility model relates to a kind of seal seat structure of expander, including seal seat 1, the seal seat 1 is used to seal the mating of expander volute and connecting sleeve 2, prevent high-pressure gas in volute from entering connecting sleeve 2, the outer power output connecting device is connected with the volute of turbine expander by connecting sleeve 2 mating.

[0019] Connecting sleeve 2 is formed with sealing gas exhaust hole 21 and sealing gas inlet hole 22 on the inner wall of seal seat cavity.The seal seat 1 is gradually narrowed from volute towards the direction of connecting sleeve 2, and third step 13, second step 12 and first step 11 are sequentially formed from left to right.The second step 12 is arranged corresponding to sealing gas inlet hole 22 when seal seat 1 and connecting sleeve 2 are installed, and the third step 13 is arranged corresponding to sealing gas exhaust hole 21.

[0020] The sealing seat 1 is formed with an air inlet groove 14 in communication with the sealing air inlet hole 22 around the outer circumference of the second step 12, and the air inlet groove 14 is spacedly provided with sealing air inlet holes 16 in communication with the inner cavity of the sealing seat 1; the sealing seat 1 is formed with an air outlet groove 15 in communication with the sealing air outlet hole 21 around the outer circumference of the third step 13, and the air outlet groove 15 is spacedly provided with sealing air outlet holes 17 in communication with the inner cavity of the sealing seat 1. The impeller in the turbine expander volute is connected with the external power output connecting device through a connecting shaft 6, and the connecting shaft 6 is provided with a carbon ring seal 61 arranged in the inner cavity of the sealing seat 1, and the sealing air enters the inner cavity of the sealing seat 1 through the sealing air inlet hole 22, the air inlet groove 14 and the sealing air inlet hole 16, and is sealed around the carbon ring seal 61.

[0021] The first step 11 is embedded with a first O-shaped sealing ring 3 on the outer circumferential wall, the second step 12 is embedded with a second O-shaped sealing ring 4 on the outer circumferential wall and away from one side of the first O-shaped sealing ring 3, and the third step 13 is embedded with a third O-shaped sealing ring 5 on the outer circumferential wall and away from one side of the second O-shaped sealing ring 4, and the first O-shaped sealing ring 3, the second O-shaped sealing ring 4 and the third O-shaped sealing ring 5 form a seal with the cavity wall of the sealing seat cavity. The first O-shaped sealing ring 3 and the second O-shaped sealing ring 4 cooperate to seal around the sealing air inlet hole 22 and the air inlet groove 14, and the second O-shaped sealing ring 4 and the third O-shaped sealing ring 5 cooperate to seal around the sealing air outlet hole 21 and the air outlet groove 15. The sealing air inlet hole 22 is used to introduce sealing dry gas, and the sealing air outlet hole 21 is used to discharge sealing dry gas and process gas (the medium is generally dry air or nitrogen). In this embodiment, the sealing dry gas is dry air or nitrogen, and the process gas is dry air or nitrogen. Here, since the medium of the sealing dry gas is consistent with the process gas, the mixed exhaust gas is also consistent.

[0022] The utility model discloses a sealing seat 1 forms the stepped structure of gradually contracting from left to right on the circumference, the inner wall of the sealing seat cavity of connecting sleeve 2 corresponds to first step 11, second step 12 and third step 13 also need to be formed into the stepped shape, the sealing gas inlet hole 22 and the sealing gas exhaust hole 21 are located on different steps. When sealing seat 1 is loaded into connecting sleeve 2 from left to right, because the outer diameter of first O-shaped sealing ring 3 is less than the inner diameter of the sealing gas exhaust hole 21 and the sealing gas inlet hole 22 corresponding sealing seat cavity, and the outer diameter of second O-shaped sealing ring 4 is less than the inner diameter of the sealing gas exhaust hole 21 corresponding sealing seat cavity, therefore, during installation, first O-shaped sealing ring 3 will not be influenced by the sealing gas exhaust hole 21 and the sealing gas inlet hole 22 to produce deformation or cut off, second O-shaped sealing ring 4 will not be influenced by the sealing gas exhaust hole 21 to produce deformation or cut off, in this way, first O-shaped sealing ring 3, second O-shaped sealing ring 4 and third O-shaped sealing ring 5 can have complete sealing cross section after installation, thereby guaranteeing effective sealing property, reaching the invention purpose.

Claims

1. A seal seat structure of an expander, comprising a seal seat (1) for sealingly connecting a connecting sleeve (2) and a volute of an expander, and the connecting sleeve (2) is formed with a seal gas exhaust hole (21) and a seal gas intake hole (22) on the inner wall of the seal seat cavity, characterized in that: The sealing seat (1) is gradually narrowed from the volute to the connecting sleeve (2), sequentially forming a third step (13), a second step (12) and a first step (11), the second step (12) corresponds to the sealing gas inlet hole (22) and the third step (13) corresponds to the sealing gas exhaust hole (21) when the sealing seat (1) is installed with the connecting sleeve (2), the first step (11) is embedded with a first O-shaped sealing ring (3) on the outer circumferential wall, the second step (12) is embedded with a second O-shaped sealing ring (4) on the outer circumferential wall and away from the side of the first O-shaped sealing ring (3) of the sealing gas inlet hole (22), and the third step (13) is embedded with a third O-shaped sealing ring (5) on the outer circumferential wall and away from the side of the second O-shaped sealing ring (4) of the sealing gas exhaust hole (21), the first O-shaped sealing ring (3), the second O-shaped sealing ring (4) and the third O-shaped sealing ring (5) form a seal with the cavity wall of the sealing seat cavity.

2. A seal carrier structure for an expander as claimed in claim 1, wherein: The sealing seat (1) is formed around the outer circumference of the second step (12) with an inlet groove (14) in communication with the sealing gas inlet hole (22), and the inlet groove (14) is distributed with sealing gas inlet holes (16) in communication with the inner cavity of the sealing seat (1) at intervals; the sealing seat (1) is formed around the outer circumference of the third step (13) with an exhaust groove (15) in communication with the sealing gas exhaust hole (21), and the exhaust groove (15) is distributed with sealing gas outlet holes (17) in communication with the inner cavity of the sealing seat (1) at intervals.

3. The seal land structure of a scroll machine according to claim 1, wherein: The sealing gas inlet hole (22) is used to introduce sealing dry gas, and the sealing gas exhaust hole (21) is used to exhaust sealing dry gas and process gas.

4. A seal carrier structure for an expander as claimed in claim 3, wherein: The sealing dry gas is dry air or nitrogen, and the medium of the process gas is dry air or nitrogen. The sealing dry gas is dry air or nitrogen, and the medium of the process gas is dry air or nitrogen.

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