Reciprocating piston compressor through water channel indicator hole structure and design method thereof
By designing the inner sealing step hole and the outer sealing step hole of the power hole in the power hole structure of the reciprocating piston compressor, and combining the use of the O-ring and soft steel flat pads, the problem of insufficient sealing in the prior art is solved, and high sealing and reliability are achieved.
Patent Information
- Application Number
- CN202411932848.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-05-06
AI Technical Summary
The design of the work holes of the existing reciprocating piston compressors has the problem of insufficient sealing, especially when the spacing between the inner and outer walls of the cylinder body changes, which can easily lead to gas leakage and O-ring damage.
The step hole inside the power hole and the step hole outside the power hole are sealed, and a sealing section and a fixing section are set on the joint rod. Combined with the design of O-ring and soft steel flat pads, the sealing properties of the joint rod are ensured by pressing the nut.
It achieves high sealing and reliability between the inner and outer walls of the cylinder body, avoids gas leakage, and simplifies the installation process.
Smart Images
Figure CN119933986A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of reciprocating piston compressor cylinders, in particular to a water channel-crossing work indicator hole structure of a reciprocating piston compressor and a design method thereof. Background Art
[0002] Process reciprocating piston compressor is a general-purpose machine widely used in the petrochemical industry. It compresses and boosts the gas in a fixed volume cylinder body by driving the piston rod (piston body) through a crank-connecting rod mechanism. As the piston rod (piston body) keeps reciprocating, the gas pressure in the cylinder body changes periodically. In order to obtain the data of this periodic change and study the life of other accessories on the cylinder body, it is necessary to set a power indicator hole at the inner and outer dead points of the cylinder body to measure the pressure in the cylinder body. Figure 1 , where 1 is the outer dead center indicator hole, 2 is the cylinder, 3 is the piston body, and 4 is the inner dead center indicator hole.
[0003] As one of the compressor design standards, API618 has set requirements for the power indicator hole. Figure 2 In the figure, there are connected airway ribs between the inner and outer walls of the cylinder body, and the indicator bushing is screwed in through threads to compact the bottom flat gasket for sealing. However, if there are no airway ribs between the inner and outer walls of the cylinder body, the design of the indicator bushing must consider the sealing between the inner cavity 5 of the cylinder body and the middle water cavity 9, the outer wall 10 of the cylinder body and the atmosphere outside the outer layer of the cylinder body, such as Figure 3 .
[0004] like Figure 3 In the early design, the inner wall soft steel gasket 7 of the cylinder body is used to seal the inner cavity 5 of the cylinder body and the middle water cavity 9, and the middle water cavity 9 and the outer outer layer of the cylinder body are sealed by the O-ring 11. However, due to the release of heat after the gas in the cylinder body is compressed and the vibration caused by the movement of the piston body, the distance between the inner wall 8 of the cylinder body and the outer wall 10 of the cylinder body will change, so that the inner wall soft steel gasket 7 of the cylinder body is not pressed firmly, causing the gas in the inner cavity 5 of the cylinder body in the cylinder sleeve 6 to enter the middle water cavity 9 or the water in the middle water cavity 9 to enter the inner cavity 5 of the cylinder body. In addition, when the indicator hole bushing 12 is screwed into the cylinder body through the thread, the O-ring 11 performs a swirling motion and is easily damaged, causing the leakage of the middle water cavity 9 and the outer outer layer of the cylinder body. Summary of the invention
[0005] In order to solve the above technical problems, the present invention provides a water channel indicator hole structure for a reciprocating piston compressor, which can effectively ensure sealing, has high reliability and is easy to install, and also provides a corresponding design method.
[0006] The technical scheme is as follows: a reciprocating piston compressor water channel indicator hole structure, which includes a cylinder liner, a cylinder inner wall, and a cylinder outer wall, an intermediate water cavity is arranged between the cylinder inner wall and the cylinder outer wall, the inner side of the cylinder liner is the cylinder inner cavity, the cylinder liner and the cylinder inner wall are provided with an indicator hole inner sealing step hole, and the cylinder outer wall is provided with an indicator hole outer sealing step hole, characterized in that the indicator hole inner sealing step hole and the indicator hole outer sealing step hole are provided with a sealing The indicator hole connecting rod is provided with a connecting rod shoulder and is separated into a sealing section and a fixed section. A soft steel flat washer is provided between the connecting rod shoulder and the step surface of the sealing step hole outside the indicator hole. O-rings are provided between the sealing section and the inner wall of the large diameter section of the sealing step hole inside the indicator hole and the inner wall of the small diameter section of the sealing step hole outside the indicator hole. A clamping nut is sleeved on the fixed section to clamp the connecting rod shoulder, and the outer peripheral surface of the clamping nut is threadedly matched with the inner wall of the large diameter section of the sealing step hole outside the indicator hole.
[0007] It is further characterized in that the sealing section is provided with three O-ring grooves, the O-ring is embedded in the O-ring grooves, one of which is located at the large diameter section of the sealing step hole inside the power indicator hole, and the remaining two are located at the small diameter section of the sealing step hole outside the power indicator hole; The end of the sealing section is provided with a guide cone surface; The clamping nut is provided with a spanner flat surface.
[0008] A design method for a power indicator hole of a reciprocating piston compressor passing through a water channel, characterized in that the hole diameters of the large diameter section of the sealing step hole inside the power indicator hole and the small diameter section of the sealing step hole outside the power indicator hole are both d, the step surface distance between the sealing step hole inside the power indicator hole and the sealing step hole outside the power indicator hole is L, the thread size of the inner wall of the large diameter section of the sealing step hole outside the power indicator hole is M, the outer diameter of the sealing section of the power indicator hole connecting rod is d1, the length of the sealing section of the power indicator hole connecting rod is L1, the outer diameter of the connecting rod shoulder of the power indicator hole connecting rod is D, the outer diameter of the fixed section of the power indicator hole connecting rod is d2, the outer thread size of the clamping nut is M1, and the center hole diameter of the clamping nut is d3, and the above parameters meet the following conditions: L1=L+1~3 mm; D=M-3~5 mm; M1=M mm, d1=d mm, d3=d2+0.5~2 mm.
[0009] The invention is further characterized in that the guide cone angle β of the sealing section end of the power indicator hole connecting rod is 15-30 degrees.
[0010] After adopting the present invention, the O-ring and the mild steel flat gasket are used at the same time, which can achieve both axial sealing and radial sealing. Even if the distance between the inner wall and the outer wall of the cylinder body changes, the radial sealing of the O-ring can prevent leakage between the layers, and the sealing reliability is high. In addition, the indicator hole connecting rod reaches the inner wall of the cylinder body through the clamping nut, and there is no need to overcome the resistance of the rotating O-ring, so the installation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 : Schematic diagram of the position of the power indicator hole on the cylinder Figure 2 : Schematic diagram of cylinder power indicator hole in API618 Figure 3 : Schematic diagram of the original airway bar without indicator hole Figure 4 : Schematic diagram of the invention without airway ribs indicator hole Figure 5 : The connecting rod diagram of the power hole of the present invention Figure 6 : The clamping nut of the present invention Figure 7 : Schematic diagram of local processing of the power indicator hole of the present invention. DETAILED DESCRIPTION
[0012] See Figures 4 to 7 As shown, a reciprocating piston compressor water channel indicator hole structure comprises a cylinder liner 6, a cylinder inner wall 8, and a cylinder outer wall 10. An intermediate water cavity 9 is arranged between the cylinder inner wall 8 and the cylinder outer wall 10. The inner side of the cylinder liner 6 is the cylinder inner cavity 5. The cylinder liner 6 and the cylinder inner wall 8 are provided with an indicator hole inner sealing step hole. The cylinder outer wall 10 is provided with an indicator hole outer sealing step hole. The indicator hole inner sealing step hole and the indicator hole outer sealing step hole are provided with an indicator hole connecting rod 15 for sealing. The connecting rod 15 is provided with a connecting rod shoulder 18 and is separated into a sealing section 20 and a fixed section 21. A soft steel flat washer 13 is provided between the connecting rod shoulder 18 and the step surface of the sealing step hole outside the power hole. O-rings 11 are provided between the sealing section 20 and the inner wall of the large diameter section of the sealing step hole inside the power hole and the inner wall of the small diameter section of the sealing step hole outside the power hole. A clamping nut 14 for clamping the connecting rod shoulder 18 is sleeved on the fixed section 21. The outer peripheral surface of the clamping nut 14 is threadedly matched with the inner wall of the large diameter section of the sealing step hole outside the power hole. The sealing section 20 is provided with three O-ring grooves 17. The O-ring 11 is embedded in the O-ring grooves 17, one of which is located at the large diameter section of the sealing step hole inside the power hole, and the remaining two are located at the small diameter section of the sealing step hole outside the power hole. The O-rings are added to improve the sealing performance.
[0013] A guide cone 16 is provided at the end of the sealing section 20 to facilitate installation; a wrench flat surface 19 is provided on the clamping nut 14.
[0014] During installation, first put a soft steel flat washer 13 into the sealing step hole outside the indicator hole of the outer wall 10 of the cylinder body, put three O-rings 11 into the O-ring groove 17 of the indicator hole connecting rod 15, and insert them into the sealing step hole outside the indicator hole. When the indicator hole connecting rod 15 enters the inner wall 8 of the cylinder body, screw on the clamping nut 14. The indicator hole connecting rod 15 will further linearly enter the sealing step hole inside the indicator hole of the inner wall 8 of the cylinder body as the clamping nut 14 is tightened, and the soft steel flat washer 13 is compacted to ensure the sealing.
[0015] A design method for a power indicator hole of a reciprocating piston compressor passing through a water channel is provided. Assuming that the diameters of the large diameter section of the sealing step hole inside the power indicator hole and the small diameter section of the sealing step hole outside the power indicator hole are both d, the step surface distance between the sealing step hole inside the power indicator hole and the sealing step hole outside the power indicator hole is L, the thread size of the inner wall of the large diameter section of the sealing step hole outside the power indicator hole is M, the outer diameter of the sealing section of the power indicator hole connecting rod is d1, the length of the sealing section of the power indicator hole connecting rod is L1, the outer diameter of the connecting rod shoulder of the power indicator hole connecting rod is D, the outer diameter of the fixed section of the power indicator hole connecting rod is d2, the outer thread size of the clamping nut is M1, and the center hole diameter of the clamping nut is d3, the above parameters meet the following conditions: L1=L+1~3 mm; D=M-3~5 mm; M1=M mm, d1=d mm, d3=d2+0.5~2 mm.
[0016] The guide cone angle β at the end of the sealing section of the indicator hole connecting rod is 15~30°.
Claims
1. A reciprocating piston compressor water channel indicator hole structure, comprising a cylinder liner, a cylinder inner wall, and a cylinder outer wall, an intermediate water cavity is arranged between the cylinder inner wall and the cylinder outer wall, the inner side of the cylinder liner is the cylinder inner cavity, the cylinder liner and the cylinder inner wall are provided with an indicator hole inner sealing step hole, and the cylinder outer wall is provided with an indicator hole outer sealing step hole, characterized in that: The sealing step hole inside the power hole and the sealing step hole outside the power hole are provided with a power hole connecting rod for sealing, the power hole connecting rod is provided with a connecting rod shoulder and is separated into a sealing section and a fixed section, a soft steel flat washer is provided between the connecting rod shoulder and the step surface of the sealing step hole outside the power hole, an O-ring is provided between the sealing section and the inner wall of the large diameter section of the sealing step hole inside the power hole and the inner wall of the small diameter section of the sealing step hole outside the power hole, a clamping nut is sleeved on the fixed section to clamp the connecting rod shoulder, and the outer peripheral surface of the clamping nut is threadedly matched with the inner wall of the large diameter section of the sealing step hole outside the power hole; the sealing section is provided with three O-ring grooves, and the O-ring is embedded in the O-ring grooves, one of which is located at the large diameter section of the sealing step hole inside the power hole, and the remaining two are located at the small diameter section of the sealing step hole outside the power hole; the end of the sealing section is provided with a guide cone surface.
2. A reciprocating piston compressor water channel indicator hole structure according to claim 1, characterized in that: The clamping nut is provided with a spanner flat surface.
3. A design method for a reciprocating piston compressor through a water channel indicator hole, characterized in that: Assume that the hole diameters of the large diameter section of the sealed step hole inside the indicator hole and the small diameter section of the sealed step hole outside the indicator hole are both d, the step surface distance between the sealed step hole inside the indicator hole and the sealed step hole outside the indicator hole is L, the inner wall thread size of the large diameter section of the sealed step hole outside the indicator hole is M, the outer diameter of the sealing section of the indicator hole connecting rod is d1, the length of the sealing section of the indicator hole connecting rod is L1, the outer diameter of the connecting rod shoulder of the indicator hole connecting rod is D, the outer diameter of the fixed section of the indicator hole connecting rod is d2, the outer thread size of the clamping nut is M1, and the center hole diameter of the clamping nut is d3. The above parameters meet the following conditions: L1=L+1~3 mm; D=M-3~5 mm; M1=M mm, d1=d mm, d3=d2+0.5~2 mm.
4. The design method of a reciprocating piston compressor water channel indicator hole according to claim 2, characterized in that: The guide cone angle β at the end of the sealing section of the indicator hole connecting rod is 15~30°.