Compressor packing seal structure

Abstract

The utility model provides a kind of compressor packing seal structure, including gland, packing box, piston rod and packing assembly, gland and packing box are sequentially arranged along first direction, packing assembly has multiple packing bodies and adjusting packing piece, multiple packing bodies are sequentially arranged along first direction, adjusting packing piece is located between any two adjacent packing bodies, piston rod sequentially passes through gland, packing assembly and packing box setting;Wherein, wherein adjusting packing piece inside is provided with the annular buffer groove of inner recess, the utility model has the beneficial effect that: the utility model provides a kind of compressor packing seal structure, by being provided with annular buffer groove on adjusting packing piece, high-pressure gas enters into annular buffer groove by first passage and second passage, reduce the pressure difference of the air pressure inside compressor packing seal structure, realize two-stage decompression, can balance part of air pressure, increase the overall service life of compressor packing seal structure.

Description

Technical Field

[0001] This utility model relates to the field of compressor sealing technology, and in particular to a compressor packing seal structure. Background Technology

[0002] In large and medium-sized reciprocating compressors, packing seals are used to seal high-pressure gas inside the cylinder on the shaft side, preventing and reducing gas leakage through the piston rod and cylinder gap. During operation, the packing seal element bears the sealing pressure differential and the thermal load of the friction surfaces. In high-pressure oilless compressors, the huge sealing pressure differential and extremely high operating temperature severely affect the performance and lifespan of the sealing element. Therefore, high-pressure oilless packing seal technology has always been a bottleneck restricting the long-term stable operation of oilless compressors.

[0003] In existing technologies, oil-free lubrication of compressors is achieved by using self-lubricating materials. Commonly used self-lubricating materials, such as polytetrafluoroethylene (PTFE), can be damaged under high temperature and pressure due to "cold flow" (the phenomenon where the plastic softens under high temperature and pressure and flows into the gap between the packing and piston rod on the low-pressure side, forming flash). Since the sealing side of the packing seal is always in atmospheric condition, meaning the pressure difference it withstands depends only on the exhaust pressure inside the cylinder, the sealing pressure difference in high-pressure compressors is extremely large. Over long periods of operation, this can easily damage the packing. Utility Model Content

[0004] This utility model provides a compressor packing seal structure to solve the technical problem that the packing is easily damaged during long-term operation due to the extremely large sealing pressure difference in high-pressure compressors.

[0005] This utility model provides a compressor packing seal structure, comprising:

[0006] Capping;

[0007] The packing box, wherein the gland and the packing box are arranged sequentially along a first direction, and an installation gap is formed between the gland and the packing box;

[0008] A packing assembly is disposed within the installation gap. The packing assembly has multiple packing bodies and adjusting packing elements. The multiple packing bodies are arranged sequentially along the first direction, and the adjusting packing elements are located between any two adjacent packing bodies.

[0009] A piston rod, which is arranged to pass sequentially through the gland, the packing assembly, and the packing box;

[0010] The adjusting packing element has a concave annular buffer groove inside, which surrounds the piston rod. The packing box has a first channel, and the packing body between the adjusting packing element and the packing box has a second channel. The annular buffer groove is connected to the air outlet of the high-pressure cylinder through the second channel and the first channel.

[0011] In one embodiment of the present invention, the adjusting packing element is further provided with a third channel, one end of the third channel being connected to the annular buffer groove, and the other end of the third channel being connected to the second channel of the packing body.

[0012] In one embodiment of this utility model, a check valve is provided at the end of the third channel that is connected to the second channel of the packing body.

[0013] In one embodiment of the present invention, the packing box and the packing assembly are further provided with a plurality of cooling water channels, which are interconnected in pairs along a top-to-bottom direction.

[0014] In one embodiment of this utility model, the cross-section of the cooling water channel is a waist-shaped structure.

[0015] In one embodiment of the present invention, at least two adjusting packing elements are provided, the at least two adjusting packing elements are arranged adjacent to each other, and the third channels of the at least two adjusting packing elements are all connected to the second channel, and the at least two check valves detect the pressure gradually increasing along the first direction.

[0016] In one embodiment of the present invention, a sealing plate is further provided between the gland and the packing assembly, a sealing channel is provided inside the sealing plate, the sealing channel is arranged around the piston rod, the gland is provided with a fourth channel, one end of the fourth channel is connected to the sealing channel, and the other end of the fourth channel extends out of the sealing plate and is connected to the nitrogen inlet pipe.

[0017] In one embodiment of the present invention, a plurality of the packing bodies are provided with sealing grooves, the sealing grooves are located on the side opposite to the first direction, and a sealing component for sealing is provided in the sealing groove. One side of the sealing component is fixedly disposed at the bottom of the sealing groove, and the other end of the sealing component abuts against the side of the adjacent packing body.

[0018] In one embodiment of the present invention, the sealing assembly includes a sealing ring and an elastic ring, the elastic ring being disposed at the bottom of the sealing groove, and the sealing ring abutting against the side of the adjacent packing body.

[0019] In one embodiment of this utility model, both the gland and the packing box are provided with sealing elements for sealing the piston rod.

[0020] The beneficial effects of this utility model are as follows: The compressor packing seal structure proposed in this utility model has an annular buffer groove on the adjusting packing component. High-pressure gas enters the annular buffer groove through the first channel and the second channel, which reduces the pressure difference inside the compressor packing seal structure, realizes two-stage pressure reduction, balances part of the gas pressure, and increases the overall service life of the compressor packing seal structure. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] In the attached diagram:

[0023] Figure 1 This is a first-view sectional view provided for an embodiment of the present utility model;

[0024] Figure 2 This is a second-view sectional view provided in one embodiment of the present invention;

[0025] Figure 3 Provided in one embodiment of this utility model Figure 1 Enlarged view of point A in the middle;

[0026] Figure 4 This is a left view provided in one embodiment of the present invention.

[0027] The attached figures are labeled as follows:

[0028] 1. Gland; 2. Stuffing box; 3. Stuffing body; 4. Adjusting stuffing; 5. Annular buffer groove; 6. Piston rod; 7. First channel; 8. Second channel; 9. Third channel; 10. Check valve; 11. Sealing plate; 12. Sealing channel; 13. Cooling water channel; 14. Sealing groove; 15. Sealing assembly. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0032] Please see Figure 1 , Figure 2 and Figure 3 An embodiment of this utility model provides a compressor packing seal structure, including a gland 1, a packing box 2, a packing assembly, and a piston rod 6. The gland 1, packing assembly, and packing box 2 are aligned along a first direction ( Figure 1 The components are arranged sequentially from left to right. The piston rod 6 passes through the gland 1, the packing assembly, and the packing box 2 in sequence. An installation gap is formed between the gland 1 and the packing box 2. The packing assembly is disposed within this installation gap and comprises multiple packing bodies 3 and adjusting packing elements 4. The multiple packing bodies 3 are arranged sequentially along the first direction, and the adjusting packing elements 4 are located between any two adjacent packing bodies 3. The adjusting packing element 4 has a concave annular buffer groove 5 surrounding the piston rod 6. The packing box 2 has a first channel 7, and the packing body 3 between the adjusting packing element 4 and the packing box 2 has a second channel 8. The annular buffer groove 5 is connected to the outlet of the high-pressure cylinder through the second channel 8 and the first channel 7. High-pressure gas enters the annular buffer groove 5 through the first channel 7 and the second channel 8, increasing the gas pressure in the annular buffer groove 5, reducing the pressure difference between the high-pressure cylinder side pressure and the device, achieving two-stage pressure reduction, lowering the sealing pressure, and extending service life.

[0033] Specifically, in an optional embodiment of this application, the adjusting packing element 4 is further provided with a third channel 9. One end of the third channel 9 is connected to the annular buffer groove 5, and the other end of the third channel 9 is connected to the second channel 8 of the packing body 3. The third channel 9 has an L-shaped structure, with the vertical section of the third channel 9 connected to the annular buffer groove 5 and the horizontal section of the third channel 9 connected to the second channel 8.

[0034] Specifically, in an optional embodiment of this application, a check valve 10 is provided at one end of the third channel 9 that connects to the second channel 8 of the packing body 3. In this embodiment, a packing body 3 is provided between the adjusting packing element 4 and the packing box 2. The check valve 10 is set to detect an air pressure of 10 MPa. When the air pressure in the annular buffer groove 5 is greater than 10 MPa, the check valve 10 closes to prevent the air pressure in the annular buffer groove 5 from being too high. When the air pressure in the annular buffer groove 5 is less than or equal to 10 MPa, the check valve 10 opens to ensure that there is sufficient air pressure in the annular buffer groove 5.

[0035] Specifically, in an optional embodiment of this application, at least two adjusting packing elements 4 are provided, and the at least two adjusting packing elements 4 are arranged adjacent to each other. The third channel 9 of the at least two adjusting packing elements 4 is connected to the second channel 8. The at least two check valves 10 detect the pressure gradually increasing along the first direction. The adjusting packing element 4 that is farther away from the packing box 2 has a lower air pressure threshold set in the check valve 10 in its third channel 9. The multi-stage pressure reduction has a better pressure reduction effect.

[0036] Specifically, in an optional embodiment of this application, a sealing plate 11 is further provided between the gland 1 and the packing assembly. The sealing plate 11 has a circular structure and is sleeved on the piston rod 6. A sealing channel 12 is provided inside the sealing plate 11 and surrounds the piston rod 6. The gland 1 is provided with a fourth channel. One end of the fourth channel is connected to the sealing channel 12, and the other end of the fourth channel extends out of the sealing plate 11 and is connected to the nitrogen inlet pipe to further seal the piston rod 6.

[0037] Please see Figure 1 , Figure 2 and Figure 4 Specifically, in an optional embodiment of this application, the packing box 2 and the packing assembly are further provided with a plurality of cooling water channels 13, which are interconnected in pairs along the direction from top to bottom to conduct away frictional heat in a timely manner and ensure that the working temperature does not exceed the standard.

[0038] Specifically, in one optional embodiment of this application, the cross-section of the cooling water channel 13 is a waist-shaped structure. The waist-shaped structure of the cooling water channel 13 can accommodate and lift, thereby reducing the number of water channels, reducing the number of coolant backflows, resulting in a small pressure difference, a large water output, and improved cooling effect.

[0039] Specifically, in one optional embodiment of this application, sealing elements for sealing the cooling water channel 13 are provided at the mating points between each pair of the gland 1, the stuffing box 2, the stuffing body 3, and the adjusting stuffing element 4.

[0040] Specifically, in one optional embodiment of this application, each of the plurality of packing bodies 3 is provided with a sealing groove 14. The sealing groove 14 is located on the side away from the first direction. The left side of the packing body 3 is provided with a sealing groove 14. A sealing component 15 for sealing is provided in the sealing groove 14. One side of the sealing component 15 is fixedly disposed at the bottom of the sealing groove 14. The other end of the sealing component 15 abuts against the side of the adjacent packing body 3. The sealing component 15 has a ring structure and is sleeved on the piston rod 6. The sealing component 15 seals between the packing bodies 3. The left side of the adjusting packing element 4 and the packing box 2 is also provided with a sealing groove 14. A sealing component 15 is also provided in the sealing groove 14 of the adjusting packing element 4 and the packing box 2.

[0041] Specifically, in an optional embodiment of this application, the sealing assembly 15 includes a sealing ring and an elastic ring, the elastic ring being disposed at the bottom of the sealing groove 14, and the sealing ring abutting against the side of the adjacent packing body 3.

[0042] Specifically, in an optional embodiment of this application, both the gland 1 and the packing box 2 are provided with sealing elements for sealing the piston rod 6.

[0043] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A compressor packing seal structure, characterized in that, include: Capping; The packing box, wherein the gland and the packing box are arranged sequentially along a first direction, and an installation gap is formed between the gland and the packing box; A packing assembly is disposed within the installation gap. The packing assembly has multiple packing bodies and adjusting packing elements. The multiple packing bodies are arranged sequentially along the first direction, and the adjusting packing elements are located between any two adjacent packing bodies. A piston rod, which is arranged to pass sequentially through the gland, the packing assembly, and the packing box; The adjusting packing element has a concave annular buffer groove inside, which surrounds the piston rod. The packing box has a first channel, and the packing body between the adjusting packing element and the packing box has a second channel. The annular buffer groove is connected to the air outlet of the high-pressure cylinder through the second channel and the first channel.

2. The compressor packing seal structure according to claim 1, characterized in that: The adjusting packing element is also provided with a third channel. One end of the third channel is connected to the annular buffer groove, and the other end of the third channel is connected to the second channel of the packing body.

3. The compressor packing seal structure according to claim 2, characterized in that: A check valve is provided at one end of the third channel that connects to the second channel of the packing body.

4. The compressor packing seal structure according to claim 1, characterized in that: The packing box and the packing assembly are also provided with multiple cooling water channels, which are interconnected in pairs along the direction from top to bottom.

5. A compressor packing seal structure according to claim 4, characterized in that: The cooling water channel has a waist-shaped cross-section.

6. A compressor packing seal structure according to claim 3, characterized in that: At least two regulating packing elements are provided, the at least two regulating packing elements are arranged adjacent to each other, and the third channels of the at least two regulating packing elements are connected to the second channel. The at least two check valves detect the pressure gradually increasing along the first direction.

7. A compressor packing seal structure according to claim 1, characterized in that: A sealing plate is also provided between the gland and the packing assembly. A sealing channel is provided inside the sealing plate and is arranged around the piston rod. The gland is provided with a fourth channel. One end of the fourth channel is connected to the sealing channel, and the other end of the fourth channel extends out of the sealing plate and is connected to the nitrogen inlet pipe.

8. A compressor packing seal structure according to claim 1, characterized in that: Each of the packing bodies is provided with a sealing groove, the sealing groove is located on the side opposite to the first direction, and a sealing component for sealing is provided in the sealing groove. One side of the sealing component is fixedly disposed at the bottom of the sealing groove, and the other end of the sealing component abuts against the side of the adjacent packing body.

9. A compressor packing seal structure according to claim 8, characterized in that: The sealing assembly includes a sealing ring and an elastic ring, the elastic ring being disposed at the bottom of the sealing groove, and the sealing ring abutting against the side of the adjacent packing body.

10. A compressor packing seal structure according to claim 1, characterized in that: Both the gland and the stuffing box are equipped with sealing elements for sealing the piston rod.

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