Water passage penetrating indicator hole structure of reciprocating piston compressor

Abstract

The utility model relates to the technical field of air cylinders of reciprocating piston compressors, in particular to a through water channel indicator hole structure of a reciprocating piston compressor, which can effectively ensure sealing performance, is high in reliability and convenient to install, provides a corresponding design method and comprises a cylinder sleeve, an air cylinder body inner wall and an air cylinder body outer wall. A middle water cavity is arranged between the inner wall of the cylinder body and the outer wall of the cylinder body, the inner side of the cylinder sleeve is a cylinder body inner cavity, the cylinder sleeve and the inner wall of the cylinder body are provided with an indicator hole inner sealing step hole, and the outer wall of the cylinder body is provided with an indicator hole outer sealing step hole. The indicator hole inner sealing stepped hole and the indicator hole outer sealing stepped hole are internally provided with indicator hole connecting rods for sealing, the indicator hole connecting rods are provided with connecting rod shoulders and are divided into sealing sections and fixing sections, and soft steel flat gaskets are arranged between the connecting rod shoulders and the stepped surface of the indicator hole outer sealing stepped hole.

Description

TECHNICAL FIELD

[0001] The utility model relates to reciprocating piston compressor cylinder technical field, is a reciprocating piston compressor crossing waterway indicator hole structure. BACKGROUND

[0002] The reciprocating piston compressor is a kind of general machinery widely used in petroleum chemical industry, and the fixed volume cylinder body is compressed by the piston rod (piston body) driven by crank connecting rod mechanism.Gas pressure in cylinder body changes periodically with the reciprocating movement of piston rod (piston body), to obtain the periodic change data, the service life of other accessories on cylinder body is studied, and indicator hole for measuring pressure in cylinder body is arranged at inner dead point and outer dead point in cylinder body. Figure 1 Wherein 1 is outer dead point indicator hole, 2 is cylinder, 3 is piston body, and 4 is inner dead point indicator hole.

[0003] API618, one of compressor design standards, makes requirements for indicator hole. Figure 2 In the figure, there are air channel ribs between the inner wall and the outer wall of the cylinder body, the indicator bushing is screwed in, and the compacted bottom flat pad is sealed.But if there are no air channel ribs between the inner wall and the outer wall of the cylinder body, the design of the indicator bushing must consider the sealing between cylinder body inner cavity 5 and intermediate water cavity 9, cylinder body outer wall 10 and outer atmosphere of cylinder body outer layer. Figure 3 .

[0004] As shown in Figure 3 , the early design is to seal cylinder body inner cavity 5 and intermediate water cavity 9 by cylinder body inner wall soft steel flat pad 7, and to seal intermediate water cavity 9 and outer atmosphere of cylinder body outer layer by O-ring 11.But due to the release of heat after the compression of gas in cylinder body and the vibration caused by the movement of piston body, the distance between cylinder body inner wall 8 and cylinder body outer wall 10 will change, so that the cylinder body inner wall soft steel flat pad 7 is not pressed, causing the gas in cylinder body inner cavity 5 in cylinder liner 6 to enter intermediate water cavity 9 or the water in intermediate water cavity 9 to enter cylinder body inner cavity 5.In addition, when indicator hole bushing 12 is screwed into the cylinder body by thread, O-ring 11 rotates, which is easy to damage, causing leakage between intermediate water cavity 9 and outer atmosphere of cylinder body outer layer. SUMMARY

[0005] In order to solve the above technical problems, the utility model provides a reciprocating piston compressor crossing waterway indicator hole structure, which can effectively ensure the sealing, has high reliability and is easy to install.

[0006] The technical scheme is as follows: a reciprocating piston compressor water channel crossing indicator hole structure, which comprises a cylinder sleeve, a cylinder body inner wall and a cylinder body outer wall, an intermediate water cavity is arranged between the cylinder body inner wall and the cylinder body outer wall, the inner side of the cylinder sleeve is a cylinder body inner cavity, an indicator hole inner sealing stepped hole is formed on the cylinder sleeve and the cylinder body inner wall, and an indicator hole outer sealing stepped hole is formed on the cylinder body outer wall, characterized in that an indicator hole connecting rod for sealing is arranged in the indicator hole inner sealing stepped hole and the indicator hole outer sealing stepped hole, a connecting rod shoulder is arranged on the indicator hole connecting rod and separates a sealing section and a fixing section, a soft steel flat gasket is arranged between the connecting rod shoulder and the stepped surface of the indicator hole outer sealing stepped hole, O-rings are arranged between the sealing section and the inner wall of a large-diameter section of the indicator hole inner sealing stepped hole and the inner wall of a small-diameter section of the indicator hole outer sealing stepped hole, a compression nut for compressing the connecting rod shoulder is arranged on the fixing section, and the outer circumferential surface of the compression nut is threadedly connected with the inner wall of the large-diameter section of the indicator hole outer sealing stepped hole.

[0007] Further, three O-ring grooves are formed in the sealing section, and one of the O-rings is arranged in the O-ring groove at the large-diameter section of the indicator hole inner sealing stepped hole, and the remaining two O-rings are arranged in the O-ring grooves at the small-diameter section of the indicator hole outer sealing stepped hole.

[0008] The end of the sealing section is provided with a guide conical surface.

[0009] The compression nut is provided with a pulling opening plane.

[0010] After the utility model is used, the O-rings and the soft steel flat gasket are used simultaneously, axial sealing and radial sealing can be realized, even if the distance between the inner wall and the outer wall of the cylinder body changes, the radial sealing of the O-rings can prevent leakage between the layers, the sealing reliability is high, and the indicator hole connecting rod reaches the inner wall of the cylinder body through the compression nut, without overcoming the resistance of the rotating O-rings, and the installation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 : Positioning diagram of an indicator hole on a cylinder

[0012] Figure 2 : Schematic diagram of a cylinder indicator hole in API618

[0013] Figure 3 : Schematic diagram of an original gas channel rib indicator hole

[0014] Figure 4 : Schematic diagram of a gas channel rib indicator hole after the utility model

[0015] Figure 5 : Indicator hole connecting rod diagram of the utility model

[0016] Figure 6 : The utility model discloses a compression nut

[0017] Figure 7 : The utility model discloses a local processing schematic view of indicator hole. DETAILED DESCRIPTION

[0018] See Figures 4 to 7 The utility model discloses a reciprocating piston compressor crossing waterway indicator hole structure, it includes cylinder liner 6, cylinder body inner wall 8, cylinder body outer wall 10, be provided with intermediate water cavity 9 between cylinder body inner wall 8 and cylinder body outer wall 10, the inside of cylinder liner 6 is cylinder body inner chamber 5, is set up in the indicator hole inner sealing step hole of cylinder liner 6 and cylinder body inner wall 8, is set up in the indicator hole outer sealing step hole of cylinder body outer wall 10, is set up in the indicator hole inner sealing step hole and the indicator hole outer sealing step hole of sealing and is used indicator hole connecting rod 15, is set up in connecting rod shoulder 18 of indicator hole connecting rod 15 and separates out sealing section 20 and fixed section 21, is set up in the step surface between connecting rod shoulder 18 and the indicator hole outer sealing step hole of soft steel flat pad 13, the O -ring 11 is set up between sealing section 20 and the inner wall of large diameter section of indicator hole inner sealing step hole, the inner wall of small diameter section of indicator hole outer sealing step hole, is set up in the pressure -tight connecting rod shoulder 18 of fixed section 21 and is set up pressure -tight nut 14, the outer periphery of pressure -tight nut 14 and the inner wall of large diameter section of indicator hole outer sealing step hole are screwed together.Three O -ring grooves 17 are set up in sealing section 20, and the O -ring 11 is embedded in O -ring groove 17, and one is located at the large diameter section of indicator hole inner sealing step hole, and the remaining two are located at the small diameter section of indicator hole outer sealing step hole, and the sealing property is improved by increasing O -ring.

[0019] The end of sealing section 20 is equipped with guide conical surface 16, and it is convenient to install;Pressure -tight nut 14 is equipped with the mouth plane 19 of pulling.

[0020] When installing, first put in soft steel flat pad 13 in the indicator hole outer sealing step hole of cylinder body outer wall 10, set 3 O -rings 11 in the O -ring groove 17 of indicator hole connecting rod 15, insert into the indicator hole outer sealing step hole, when indicator hole connecting rod 15 enters cylinder body inner wall 8, screw on pressure -tight nut 14, and indicator hole connecting rod 15 will further linearly enter the indicator hole inner sealing step hole of cylinder body inner wall 8 along with the tightening of pressure -tight nut 14, and compacts soft steel flat pad 13, and the sealing property is ensured.

[0021] The hole diameter of the large diameter section of the sealing stepped hole in the indicator hole and the small diameter section of the sealing stepped hole outside the indicator hole is d, the distance L between the stepped surfaces of the sealing stepped hole in the indicator hole and the sealing stepped hole outside the indicator hole, the thread size of the inner wall of the large diameter section of the sealing stepped 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 compression nut is M1, and the center hole diameter of the compression nut is d3, and the above parameters satisfy 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, and the guide cone angle β of the end of the sealing section of the indicator hole connecting rod is 15~30°.

Claims

1. A reciprocating piston compressor with a through-water indicator hole structure, comprising a cylinder liner, an inner cylinder wall, and an outer cylinder wall, wherein an intermediate water cavity is provided between the inner cylinder wall and the outer cylinder wall, the inner side of the cylinder liner is the inner cavity of the cylinder, an inner sealing step hole for the indicator hole is formed on the cylinder liner and the inner cylinder wall, and an outer sealing step hole for the indicator hole is formed on the outer cylinder wall, characterized in that... A sealing indicator rod is provided in the inner sealing step hole and the outer sealing step hole of the indicator hole. The indicator rod is provided with a shoulder and is divided into a sealing section and a fixing section. A soft steel flat washer is provided between the shoulder of the rod and the step surface of the outer sealing step hole of the indicator hole. O-rings are provided between the sealing section and the inner wall of the large diameter section of the inner sealing step hole of the indicator hole and the inner wall of the small diameter section of the outer sealing step hole of the indicator hole. A clamping nut is fitted on the fixing section to press the shoulder of the rod. The outer circumferential surface of the clamping nut is threaded to the inner wall of the large diameter section of the outer sealing step hole of the indicator hole.

2. The reciprocating piston compressor through-waterway indicator hole structure according to claim 1, characterized in that, The sealing section has three O-ring grooves, and the O-rings are embedded in the O-ring grooves. One of them is located at the large diameter section of the sealing step hole inside the indicator hole, and the remaining two are located at the small diameter section of the sealing step hole outside the indicator hole.

3. The reciprocating piston compressor through-waterway indicator hole structure according to claim 1, characterized in that, The end of the sealing section is provided with a guide cone surface.

4. The reciprocating piston compressor through-waterway indicator hole structure according to claim 1, characterized in that, The clamping nut has a wrench face.

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