Split piston rod sealing structure for double-acting diaphragm compressor

Abstract

The utility model discloses a split piston rod sealing structure for a double-acting diaphragm compressor, which relates to the technical field of diaphragm compressor sealing, and comprises a piston rod body and a driving piston, the piston rod body is slidably connected in a cylinder sleeve I and a cylinder sleeve II in a midbody tee joint of the compressor, one end of the piston rod body is connected with a crosshead, and the other end of the piston rod body is connected with the driving piston. A driving piston is arranged at the other end of the piston rod body, a first guide belt and a first sealing ring are arranged on the driving piston, and a second guide belt and a second dry sealing ring are arranged on the piston rod body. The guide belt and the sealing ring are arranged between the piston and the cylinder sleeve to ensure that high-pressure lubricating oil in the middle body does not leak, the guide belt ensures that the friction of the piston rod is reduced in the working process, and the leakage position of the lubricating oil is reduced by adopting the integrated middle body three-way design. The split piston and threads are fixed through the nut and the pin, so that the risk of failure of the piston rod caused by too high piston force can be avoided to a great extent.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm compressor seals, in particular to a split piston rod seal structure for a double-acting diaphragm compressor. Background Art

[0002] The double-acting diaphragm compressor adopts a new T-type piston structure. In one reciprocating stroke, two diaphragm heads are driven to work once each through two independent oil chambers with a phase difference of 180°, thereby achieving a double-acting compressor. It combines the characteristics of double-acting compressors and diaphragm compressors, and has the advantages of high efficiency, energy saving, and environmental protection.

[0003] The piston rod sealing structure in the double-acting diaphragm compressor is a design difficulty. Conventional piston rods, piston heads, and piston rods are integrated. When the piston force is large, there may be a risk of piston rod failure. At the same time, it is necessary to ensure that the internal high-pressure lubricating oil does not leak when the compressor is performing double-acting work. Utility Model Content

[0004] The utility model aims to provide a split piston rod sealing structure for a double-acting diaphragm compressor to overcome the above-mentioned defects in the prior art.

[0005] A split piston rod sealing structure for a double-acting diaphragm compressor comprises a piston rod body and a driving piston, wherein the piston rod body is slidably connected to cylinder sleeves 1 and 2 in the middle body tee of the compressor, one end of the piston rod body is connected to a crosshead, and the other end of the piston rod body is provided with a driving piston, the driving piston is provided with two guide bands 1, and the driving piston is provided with a plurality of sealing rings 1 evenly distributed between the two guide bands 1, the piston rod body is provided with two guide bands 2, and the piston rod body is provided with a plurality of sealing rings 2 evenly distributed between the two guide bands 2.

[0006] Preferably, the drive piston is threadedly connected to the piston rod body.

[0007] Preferably, the drive piston is fixed to the piston rod body by a nut threadedly connected to the end of the piston rod body.

[0008] Preferably, the nut is fixed to the piston rod body by a pin.

[0009] Preferably, the number of the sealing rings is two.

[0010] Preferably, the number of the sealing rings 2 is three.

[0011] The utility model has the following advantages:

[0012] 1. The piston and cylinder liner of the present application use a guide belt and a sealing ring to ensure that there is no risk of leakage of high-pressure lubricating oil inside the middle body. The guide belt ensures that the friction of the piston rod is reduced during operation, and an integrated middle body three-way design is adopted to reduce the leakage location of the lubricating oil.

[0013] 2. This application adopts a split piston with threads and fixes it with a nut and a pin, which can greatly avoid the risk of piston rod failure caused by excessive piston force. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is a schematic diagram of the sealing structure on the piston rod body and the driving piston of the utility model.

[0016] Figure 3 This is a schematic diagram of the sealing structure on the driving piston of the utility model.

[0017] Among them: 1. compressor; 2. cylinder liner one; 3. cylinder liner two; 4. crosshead; 5. piston rod body; 51. guide belt two; 52. sealing ring two; 6. driving piston; 61. guide belt one; 62. sealing ring one; 7. nut; 8. pin. DETAILED DESCRIPTION

[0018] The specific implementation methods of the utility model are further explained in detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the utility model.

[0019] like Figure 1-3 As shown, the utility model provides a split piston rod sealing structure for a double-acting diaphragm compressor 1, including a piston rod body 5 and a driving piston 6, wherein the piston rod body 5 is slidably connected to the cylinder sleeve 1 2 and the cylinder sleeve 2 3 in the middle body tee of the compressor 1, one end of the piston rod body 5 is connected to the crosshead 4, and the other end of the piston rod body 5 is provided with a driving piston 6, and the driving piston 6 is provided with two guide bands 1 61, and the driving piston 6 is provided with two sealing rings 1 62 between the two guide bands 1 61, and the piston rod body 5 is provided with two guide bands 2 51, and the piston rod body 5 is provided with three sealing rings 2 52 between the two guide bands 2 51.

[0020] In addition, the driving piston 6 is threadedly connected to the piston rod body 5, and the driving piston 6 is fixed to the piston rod body 5 by a nut 7 threadedly connected to the end of the piston rod body 5, and the nut 7 is fixed to the piston rod body 5 by a pin 8. The driving piston 6 is screwed onto the piston rod body 5 by means of a thread and fixed by the nut 7, and the nut 7 is fixed by means of a pin 8. The driving piston 6 is sealed by means of a guide band 61 and a sealing ring 62, and the piston rod body 5 is sealed by means of a guide band 51 and a sealing ring 52.

[0021] To sum up, the present application uses a guide belt and a sealing ring between the piston and the cylinder liner to ensure that there is no risk of leakage of high-pressure lubricating oil inside the middle body. The guide belt ensures that the friction of the piston rod is reduced during operation. The integrated middle body three-way design is adopted to reduce the leakage location of the lubricating oil. The split piston is added with threads and fixed with a nut and a pin, which can greatly avoid the risk of piston rod failure caused by excessive piston force.

[0022] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A split piston rod seal structure for a double-acting diaphragm compressor, characterized in that: The invention comprises a piston rod body (5) and a driving piston (6), wherein the piston rod body (5) is slidably connected to a cylinder sleeve 1 (2) and a cylinder sleeve 2 (3) in a middle body tee of a compressor (1), one end of the piston rod body (5) is connected to a crosshead (4), and the other end of the piston rod body (5) is provided with a driving piston (6), the driving piston (6) is provided with two guide bands 1 (61), and the driving piston (6) is provided with a plurality of sealing rings 1 (62) evenly distributed between the two guide bands 1 (61), the piston rod body (5) is provided with two guide bands 2 (51), and the piston rod body (5) is provided with a plurality of sealing rings 2 (52) evenly distributed between the two guide bands 2 (51).

2. The split piston rod seal structure for a double-acting diaphragm compressor according to claim 1 is characterized in that: The driving piston (6) is threadedly connected to the piston rod body (5).

3. The split piston rod seal structure for a double-acting diaphragm compressor according to claim 1 is characterized in that: The driving piston (6) is fixed to the piston rod body (5) via a nut (7) threadedly connected to the end of the piston rod body (5).

4. The split piston rod seal structure for a double-acting diaphragm compressor according to claim 3 is characterized in that: The nut (7) is fixed on the piston rod body (5) via a pin (8).

5. The split piston rod seal structure for a double-acting diaphragm compressor according to claim 1 is characterized in that: The number of the sealing rings 1 (62) is two.

6. The split piston rod seal structure for a double-acting diaphragm compressor according to claim 1 is characterized in that: The number of the second sealing rings (52) is three.

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