Eccentric supporting ring structure for low-temperature reciprocating compressor
By designing an eccentric support ring, the problems of piston eccentricity and high-temperature cylinder locking of low-temperature reciprocating compressors are solved, and the smoothness of piston movement and stable operation of the compressor are achieved at extreme temperatures.
Patent Information
- Application Number
- CN202422180919.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-09-06
AI Technical Summary
The support ring of the low-temperature reciprocating compressor causes the piston to eccentrize under extreme temperature changes, affecting the smoothness of movement, and may cause the cylinder to lock in the high temperature state.
An eccentric support ring structure is designed, in which the inner hole of the support ring is eccentric and the thickness gradually changes from the top to the bottom to ensure that the piston rod sinks at low temperatures and remains near the center line of the cylinder after sinking at high temperatures. At high temperatures, the support ring has enough space to expand without locking.
This design ensures that the central position of the piston rod is stable at low temperatures and avoids eccentric movement; provides sufficient expansion space at high temperatures to prevent the cylinder from locking, and ensures the normal operation of the compressor.
Smart Images
Figure CN222976982U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an improved invention of a low-temperature reciprocating compressor, in particular to an improved invention of an eccentric support ring structure for a low-temperature reciprocating compressor. Background Art
[0002] The temperature inside the cylinder of a low-temperature reciprocating compressor can reach -160°C. The support ring is circular and is an important part that bears the weight of the piston components to ensure the stability during the piston movement. As all components shrink, the support ring also shrinks, and the working temperature span is relatively large, with the lowest working temperature being -160°C and the extreme short-term high temperature being up to 100°C. The piston will sink to a certain extent in the low-temperature state, thus generating eccentricity and affecting the smoothness of the piston movement. While in the high-temperature state, the center of the piston rod floats upward, and the support ring may lock the cylinder after expanding at high temperature. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an eccentric support ring structure for a low-temperature reciprocating compressor.
[0004] To solve the above technical problem, the utility model is implemented by adopting the following technical scheme: The eccentric support ring structure for a low-temperature reciprocating compressor includes a horizontally arranged piston body and a piston rod. A support ring is provided on the outer circle of the piston body. It is characterized in that: the inner hole of the support ring is eccentrically arranged upward, and the thinnest section of the support ring is located at the top, and the thickest section is located at the bottom. The thickness of the support ring gradually changes from the top to the bottom; a positioning screw is provided on the piston body, and a positioning hole is provided on the inner circle of the corresponding support ring. The positioning hole is in limit fit with the positioning screw.
[0005] The support ring is split into upper and lower two halves, and there is an opening gap between the upper and lower two halves.
[0006] A plurality of straight unloading grooves are opened on the outer circle of the support ring, and the plurality of straight unloading grooves are arranged symmetrically left and right on the outer circle of the support ring.
[0007] The eccentricity of the inner hole of the support ring is 0.5 - 2 mm.
[0008] The beneficial effect of the utility model is that for the improved eccentric support ring structure for a low-temperature reciprocating compressor, the inner hole of the support ring is eccentrically arranged upward. The thicker side of the eccentric support ring is installed below, and the thinner side is installed above. When installed at normal temperature, the center of the piston rod is offset above the center of the cylinder within the range of 0.5 - 2 mm. In the low-temperature state, it can ensure that the center of the piston rod after contraction and sinking is near the center line of the cylinder; in the high-temperature state, the center of the piston rod floats upward, and the relatively thin eccentric support ring on the upper side leaves enough space so that it will not expand and lock the cylinder after expanding at high temperature. Description of the Drawings
[0009] The following further elaborates on the specific implementation manners of the present utility model in conjunction with the accompanying drawings.
[0010] Figure 1 It is a structural schematic diagram of the present utility model.
[0011] Figure 2 It is a structural diagram of the support ring of the present utility model. Specific implementation manners
[0012] The accompanying drawings show the structure of the present utility model, and the following further explains its relevant details in conjunction with the accompanying drawings. In this embodiment, referring to the accompanying Figure 1-2 , the structure of the two-piece eccentric support ring 3 for this low-temperature reciprocating compressor includes a piston body 1 and a piston rod 2 arranged horizontally. A support ring 3 is provided on the outer circle of the piston body 1. The inner hole of the support ring 3 is eccentrically arranged upward. Correspondingly, the thinnest section of the support ring 3 is located at the top, and the thickest section of the support ring 3 is located at the bottom. The thickness of the support ring 3 gradually changes from the top to the bottom; a positioning screw 4 is provided on the piston body 1, and a positioning hole 5 is provided on the inner circle of the corresponding support ring 3. The positioning hole 5 is in limit fit with the positioning screw 4. Specifically, the positioning hole 5 is sleeved on the positioning screw 4.
[0013] The working principle of the present utility model: The thicker side of the eccentric support ring 3 is installed below, and the thinner side is installed above. When installed at normal temperature, the center of the piston rod 2 is offset above the center of the cylinder by 0.5 - 2 mm. In the low-temperature state, it can ensure that the center of the piston rod 2 after contraction and sinking is near the center line of the cylinder; in the high-temperature state, the center of the piston rod 2 floats upward, and the thinner eccentric support ring 3 above leaves enough space so as not to expand and lock the cylinder after high-temperature expansion.
[0014] As a further improved specific implementation manner, the support ring 3 is split into upper and lower two pieces, and there is an opening gap 6 between the upper and lower two pieces to prevent deformation interference caused by the circumferential expansion and contraction of the diameter when the upper and lower two-piece support rings 3 are positioned.
[0015] As a further improved specific implementation manner, a number of straight unloading grooves 7 are provided on the outer circle of the support ring 3. The number of straight unloading grooves 7 is symmetrically arranged left and right on the outer circle of the support ring 3 to ensure uniform pressure difference between the left and right two sections of the support ring 3.
[0016] As a further improved specific implementation manner, the eccentricity of the inner hole of the support ring 3 is 0.5 - 2 mm to match the gap between the piston and the top and bottom of the cylinder.
[0017] In summary, the above are only the preferred embodiments of the present utility model and are not used to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. An eccentric support ring structure for a low-temperature reciprocating compressor, comprising a piston body and a piston rod arranged horizontally, a support ring being arranged on the outer circle of the piston body, characterized in that: The inner hole of the supporting ring is eccentrically arranged upward, the thinnest section of the corresponding supporting ring is located at the top, the thickest section of the supporting ring is located at the bottom, and the thickness of the supporting ring gradually transitions from the top to the bottom; a positioning screw is provided on the piston body, and a positioning hole is provided on the corresponding inner circle of the supporting ring, and the positioning hole is limitedly matched with the positioning screw.
2. The eccentric support ring structure for a cryogenic reciprocating compressor according to claim 1, characterized in that: The support ring is split into two upper and lower lobes, and an opening gap is left between the upper and lower lobes.
3. The eccentric support ring structure for a cryogenic reciprocating compressor according to claim 1 or 2, characterized in that: A plurality of straight unloading grooves are provided on the outer circle of the supporting ring, and the plurality of straight unloading grooves are arranged on the outer circle of the supporting ring in a bilaterally symmetrical manner.
4. The eccentric support ring structure for a cryogenic reciprocating compressor according to claim 1, characterized in that: The eccentricity of the inner hole of the supporting ring is 0.5-2 mm.