US-20260126038-A1 - CONNECTOR STRUCTURE OF STEPLESS CAPACITY CONTROL ACTUATOR OF RECIPROCATING COMPRESSOR

US20260126038A1US 20260126038 A1US20260126038 A1US 20260126038A1US-20260126038-A1

Abstract

Provided is a connector structure of a stepless capacity control actuator of a reciprocating compressor including an ejector rod configured to transfer power provided by a driving structure to an unloader. The connector structure includes a housing sleeving the ejector rod, a connecting member including a flange part and a sleeve part, and a sealing assembly including a first end face sealing ring, a second end face sealing ring, a first seal ring and an oil leakage joint. A first side of the flange part is connected with a second end of the housing and a second side of the flange part is configured to connect with the driving structure. A second oil hole is formed in the sleeve part and in butt joint with a first oil hole. The oil leakage joint is connected to the first oil hole.

Inventors

Jinjie Zhang
Yao Wang
Chao Zhou

Assignees

BEIJING UNIVERSITY OF CHEMICAL TECHNOLOGY

Dates

Publication Date: 20260507
Application Date: 20250210
Priority Date: 20241107

Claims (10)

1 . A connector structure of a stepless capacity control actuator of a reciprocating compressor, comprising: an ejector rod having a first end configured to connect with an ejector plate of an unloader, and a second end configured to connect with a driving end of a driving structure; a housing sleeving the ejector rod, wherein a gap is formed between the housing and the ejector rod, a first oil hole is formed in the housing, two ends of the first oil hole are located on an inner side surface and an outer side surface of the housing, respectively, and a first end of the housing is configured to connect with a valve cover of a compressor; a connecting member comprising a flange part and a sleeve part, the flange part having a first side configured to connect with a second end of the housing, and a second side configured to connect with a shell of the driving structure and be in sealing contact with the shell, the sleeve part being located between the ejector rod and the housing and being connected to one side, away from the driving structure, of the flange part, wherein a gap is formed between the sleeve part and the ejector rod, a second oil hole is formed in the sleeve part, two ends of the second oil hole are located on an inner side surface and an outer side surface of the sleeve part, respectively, and the second oil hole is in butt joint with the first oil hole; and a sealing assembly comprising: a first end face sealing ring configured to seal a gap between the first side of the flange part and the housing, a second end face sealing ring configured to seal a gap between the valve cover and the housing, a first seal ring located between the ejector rod and the housing, and located on one side, away from the driving structure, of the sleeve part and an oil leakage joint in communication with the first oil hole for recovering hydraulic oil in a case that the driving structure is a hydraulic cylinder, wherein an inner side surface of the first seal ring is in sealing contact with the ejector rod, and an outer side surface of the first seal ring is in sealing contact with the inner side surface of the housing to seal the gap between the ejector rod and the housing.
2 . The connector structure of a stepless capacity control actuator of a reciprocating compressor according to claim 1 , wherein the sealing assembly further comprises: a gas guide ring located between the ejector rod and the housing, and located at one side, away from the driving structure, of the first seal ring and having a first gas hole formed in the gas guide ring, two ends of the first gas hole being located on an inner side surface and an outer side surface of the gas guide ring, respectively, wherein a second gas hole is formed in the housing and two ends of the second gas hole are located on the inner side surface and the outer side surface of the housing, respectively; the second gas hole is in butt joint with the first gas hole; and a gas leakage joint in communication with the second gas hole for recovering gas leaked from the compressor.
3 . The connector structure of a stepless capacity control actuator of a reciprocating compressor according to claim 2 , wherein the sealing assembly further comprises a second seal ring located between the ejector rod and the housing, and located at one side, away from the driving structure, of the gas guide ring, an inner side surface of the second seal ring is in sealing contact with the ejector rod, and an outer side surface of the sealing ring is in sealing contact with the inner side surface of the housing, such that the gap between the ejector rod and the housing is sealed to reduce an volume of gas leaked from the compressor to the gas guide ring.
4 . The connector structure of a stepless capacity control actuator of a reciprocating compressor according to claim 3 , wherein the housing is provided with an inner flange located at one side, away from the driving structure, of the second seal ring for limiting a circumferential position of the second seal ring, and the ejector rod extends through the inner flange.
5 . The connector structure of a stepless capacity control actuator of a reciprocating compressor according to claim 3 , wherein the second seal ring comprises: a second ring block located between the ejector rod and the housing, an inner sealing ring of the second ring block embedded in an inner side surface of the second ring block for making sealing contact with the ejector rod, and an outer sealing ring of the second ring block embedded in an outer side surface of the second ring block for making sealing contact with the inner side surface of the housing.
6 . The connector structure of a stepless capacity control actuator of a reciprocating compressor according to claim 2 , further comprising: an inner ring groove formed in the inner side surface of the gas guide ring, and an outer ring groove formed in the outer side surface of the gas guide ring, wherein one end of the first gas hole is in communication with the inner ring groove; and an other end of the first gas hole is in communication with the outer ring groove.
7 . The connector structure of a stepless capacity control actuator of a reciprocating compressor according to claim 1 , wherein the first seal ring comprises: a first ring block located between the ejector rod and the housing, an inner sealing ring of the first ring block embedded in an inner side surface of the first ring block for making sealing contact with the ejector rod, and an outer sealing ring of the first ring block embedded in an outer side surface of the first ring block for making sealing contact with the inner side surface of the housing.
8 . The connector structure of a stepless capacity control actuator of a reciprocating compressor according to claim 1 , wherein the second oil hole is obliquely arranged with respect to the sleeve part; and one end, located on the inner side surface of the sleeve part, of the second oil hole is closer to the driving structure than one end, located on the outer side surface of the sleeve part, of the second oil hole.
9 . The connector structure of a stepless capacity control actuator of a reciprocating compressor according to claim 1 , wherein: following requirements need to be met during model selection of a return spring of the unloader: k = m ⁢ arcos ⁡ ( F s ⁢ 1 - F ′ + F g ⁢ 1 + F g ⁢ 2 + f - m ⁢ g ⁢ cos ⁢ α F s ⁢ 2 - F ′ + F g ⁢ 1 + F g ⁢ 2 + f - m ⁢ g ⁢ cos ⁢ α ) t ma ⁢ x ′ k > F ′ + m ⁢ g ⁢ cos ⁢ α - f - F g ⁢ 1 x 1 following requirements need to be met during model selection of the driving structure: F = k ( x 1 + L - x 1 · cos ⁢ ( k m · t ma ⁢ x ) ) 1 - cos ⁢ ( k m · t ma ⁢ x ) + F g ⁢ 1 + f - m ⁢ g ⁢ cos ⁢ α wherein p cy is a gas pressure in the compressor; p 0 is a standard atmospheric pressure; p s is a gas pressure in a suction chamber of the compressor; β is a coefficient of a pressure difference between both sides of a valve plate of the unloader; A sv is an area of the valve plate; A 1 is a sectional area of the ejector rod, A l = π 4 ⁢ d 1 2 ; d 1 is a diameter of a section, close to the driving structure, of the ejector rod, and a diameter d 2 of a section, away from the driving structure, of the ejector rod is equal to 1.5d 1 ; f is a friction force subjected by the ejector rod; g is gravity acceleration; L is a stroke of the unloader; α is a mounting angle of the unloader, which indicates an included angle between a central line of the unloader and a line perpendicular to a ground; m is a sum of masses of the ejector rod, the shell of the unloader, the ejector plate of the unloader, a ejector fork of the unloader and a gland of the unloader; x 1 is a pre-compression amount of the return spring; F g2 is a gas force subjected by the valve plate, F g2 =β(p cy −p s )A sv ; k is stiffness of the return spring; x is a compression amount of the return spring; F′ is a driving force of the driving structure on the ejector rod in a retraction process of the ejector rod; and F is a driving force of the driving structure on the ejector rod in an ejection process of the ejector rod.
10 . The connector structure of a stepless capacity control actuator of a reciprocating compressor according to claim 9 , wherein during model selection of the ejector rod, the diameter of the ejector rod is determined through following iterative computation modes: initially, d 1 =10 mm is substituted into formula F = k ( x 1 + L - x 1 · cos ⁢ ( k m · t m ⁢ x ) ) 1 - cos ⁢ ( k m · t m ⁢ x ) + F g ⁢ 1 + f - m ⁢ g ⁢ cos ⁢ α to calculate an ejection driving force; if F≤800 N, then d 1 =10 mm, and the diameter of the ejector rod is determined; if F>800 N, then the diameter d 1 of the ejector rod needs to be increased to 12 mm; d 1 =12 mm is substituted into formula (11) for iterative computation to calculate an ejection driving force F; if 800 N≤F≤1600 N, then d 1 =12 mm, and the diameter of the ejector rod is determined; and if F>1600 N, then the diameter d 1 of the ejector rod needs to be increased to 14 mm, so that strength of the ejector rod is sufficient for use, the iterative computation is ended, and the diameter of the ejector rod is determined.

Description

CROSS-REFERENCE TO RELATED APPLICATION This patent application claims the benefit and priority of Chinese Patent Application No. 202411577866.9 filed with the China National Intellectual Property Administration on Nov. 7, 2024, the disclosure of which is incorporated by reference herein in its entirety as part of the present application. TECHNICAL FIELD The present disclosure relates to the technical field of reciprocating compressors, and in particular to a connector structure of a stepless capacity control actuator of a reciprocating compressor. BACKGROUND As the key power equipment in process industries such as oil refining, chemical industry and chemical fertilizer, the reciprocating compressor system is configured to delivery high pressure raw gas media to production process, which is the key of industrial production material flow, thus its safe, stable and reliable operation is the long-term demand of enterprises. The reciprocating compressor changes the volume of a working chamber between the piston and the cylinder through the periodic movement of the piston, thus controlling the gas pressure in the working chamber. However, when the initial design of the process flow does not match the market demand, the capacity of the unit needs to be dynamically controlled to meet the production requirements. At present, the control mode that satisfies both energy conservation and the supply and demand of production gas is pressing-off inlet valve control, in which an electro-hydraulic servo actuator or electromagnetic actuator is installed on the inlet valve to control the flow and pressure of the unit quickly and accurately. Compared with other control methods, the pressing-off inlet valve control has the advantages of low project implementation difficulty, wide load adjustment range, and the most outstanding energy-saving effect. The control system for the pressing-off inlet valve has been publicized in China and at abroad, in which the actuator is driven by hydraulic pressure or electromagnetic force. According to the different driving modes, there are generally two types of existing actuators, but the universal structural design is not considered. If different actuators are installed in the same type of unit, it is difficult to achieve component exchange, which brings great difficulties to on-site installation, maintenance and spare parts management. SUMMARY The present disclosure aims to provide a connector structure of a stepless capacity control actuator of a reciprocating compressor to solve the problems in the prior art, adapting to two driving modes of hydraulic pressure and electromagnetic force. To achieve the objective above, the present disclosure employs the following technical solution. The present disclosure provides a connector structure of a stepless capacity control actuator of a reciprocating compressor, including an ejector rod, where a first end of the ejector rod is configured to connect with a ejector plate of an unloader, and a second end of the ejector rod is configured to connect with a driving end of a driving structure. A housing sleeving the ejector rod, where a gap is formed between the housing and the ejector rod, a first oil hole is formed in the housing, two ends of the first oil hole are located on an inner side surface and an outer side surface of the housing, respectively, and a first end of the housing is configured to connect with a valve cover of a compressor. A connecting member including a flange part and a sleeve part, where a first side of the flange part is configured to connect with a second end of the housing, and a second side of the flange part is configured to connect with a shell of the driving structure and be in sealing contact with the shell. The sleeve part is connected to one side, away from the driving structure, of the flange part, the sleeve part is located between the ejector rod and the housing, and a gap is formed between the sleeve part and the ejector rod; a second oil hole is formed in the sleeve part, two ends of the second oil hole are located on an inner side surface and an outer side surface of the sleeve part, respectively; and the second oil hole is in butt joint with the first oil hole. A sealing assembly including a first end face sealing ring, a second end face sealing ring, a first seal ring and an oil leakage joint, where the first end face sealing ring is configured to seal a gap between the first side of the flange part and the housing, and the second end face sealing ring is configured to seal a gap between the valve cover and the housing. The first seal ring is located between the ejector rod and the housing, and located on one side, away from the driving structure, of the sleeve part; an inner side surface of the first seal ring is in sealing contact with the ejector rod, and an outer side surface of the first seal ring is in sealing contact with the inner side surface of the housing to seal the gap between the ejector rod and the