An ultra-high pressure gap filler combined reciprocating sealing device

Abstract

The present invention discloses an ultra-high pressure gap packing combined reciprocating sealing device, comprising a liquid inlet valve body and a stuffing box body fixed on a liquid cylinder body, a stuffing gland fixed at one end of the stuffing box body, a plunger and a sleeve, wherein the inner diameter of the sleeve is slightly larger than the diameter of the plunger, a through hole slightly larger than the outer diameter of the sleeve and used for installing the sleeve is provided on the stuffing box body, a stepped hole is provided on the liquid inlet valve body, the large end of the stepped hole on the liquid inlet valve body is slightly larger than the outer diameter of the sleeve and used for installing the sleeve, and the small end is slightly larger than the diameter of the plunger, and a through hole slightly larger than the diameter of the plunger is provided on the stuffing gland; by arranging a plurality of labyrinth pressure relief annular grooves on the inner wall of the sleeve, the pressure of the medium in the ultra-high pressure reciprocating pump is greatly reduced after the pressure is gradually relieved by the plurality of labyrinth pressure relief annular grooves, and then the medium is further sealed by the packing ring seal, thereby greatly enhancing the sealing effect of the ultra-high pressure reciprocating pump.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-high pressure sealing, in particular to an ultra-high pressure gap filler combined reciprocating sealing device. Background Art

[0002] It's generally considered that equipment with a conveying medium pressure exceeding 100 MPa is considered ultra-high-pressure equipment. With the continuous advancement of high-pressure reciprocating pump technology, the high-pressure water jet cleaning industry now considers high-pressure reciprocating pumps with pressures exceeding 140 MPa to be ultra-high-pressure reciprocating pumps. Ultra-high-pressure sealing technology is the most critical technical difficulty in ultra-high-pressure reciprocating pump technology.

[0003] High-pressure pumps with medium pressures not exceeding 140 MPa can achieve good sealing effects by using packing seals, but ultra-high-pressure pumps with pressures exceeding 140 MPa cannot achieve satisfactory sealing effects by relying solely on packing seals, and the higher the pressure, the worse the sealing effect. With the expansion of the application of high-pressure water jet technology in various fields of my country's national economy, many occasions, such as the field of high-pressure water ship rust removal, require working pressures to reach above 250 MPa. There is an urgent need to solve the sealing problem of high-pressure reciprocating pumps under ultra-high pressure conditions. In addition, existing ultra-high pressure sealing devices also have technical methods that rely solely on the extremely small gap formed by the plunger and the sleeve to achieve sealing. However, this sealing method has very high requirements on processing technology and materials on the one hand, and too high requirements on the cleanliness of the medium on the other hand. At the same time, it is only applicable to vertical ultra-high pressure reciprocating pumps. For horizontal ultra-high pressure reciprocating pumps, the sleeve is prone to uneven wear under the action of the plunger's own weight, resulting in poor sealing effect. Especially when used in working environments exceeding 140 MPa, its sealing effect is difficult to meet working requirements. Summary of the Invention

[0004] In view of the poor sealing effect of existing ultra-high pressure sealing devices in working environments exceeding 140MPa, an ultra-high pressure gap packing combined reciprocating sealing device is provided. Through the labyrinth pressure relief annular groove seal and the packing ring seal, the pressure of the medium in the ultra-high pressure reciprocating pump is greatly reduced after the step-by-step pressure relief of multiple labyrinth pressure relief annular grooves, and then the further sealing effect of the packing ring seal is enhanced to enhance the sealing effect of the ultra-high pressure reciprocating pump.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An ultra-high-pressure gap packing combined reciprocating sealing device comprises a liquid inlet valve body and a stuffing box body fixed to a liquid cylinder body, a stuffing gland fixed to one end of the stuffing box body, a plunger, and a sleeve. The inner diameter of the sleeve is slightly larger than the diameter of the plunger. The stuffing box body is provided with a through hole slightly larger than the outer diameter of the sleeve and used to mount the sleeve. The liquid inlet valve body is provided with a stepped hole. The large end of the stepped hole on the liquid inlet valve body is slightly larger than the outer diameter of the sleeve and used to mount the sleeve, and the small end is slightly larger than the diameter of the plunger. The stuffing gland is provided with a through hole slightly larger than the diameter of the plunger. The through hole on the stuffing gland, the through hole on the stuffing box body, the stepped hole on the liquid inlet valve body, the sleeve, and the plunger are all coaxially arranged.

[0007] The stuffing box body is fixed to one side of the liquid inlet valve body, and the plunger passes through and movably connects the through hole on the stuffing gland, the through hole on the stuffing box body, and the stepped hole on the liquid inlet valve body in sequence. An annular cavity is formed between the large end of the stepped hole on the liquid inlet valve body, the through hole on the stuffing box body, and the plunger. A spring, a sleeve, a support ring, a packing ring, a support ring, and a guide sleeve are sequentially arranged in the annular cavity. The spring is close to the shoulder of the stepped hole on the liquid inlet valve body, and the guide sleeve is close to the stuffing gland. The sleeve, support ring, packing ring, support ring, and guide sleeve are confined in the annular cavity by the elastic force generated by the deformation of the spring;

[0008] A plurality of labyrinth pressure relief annular grooves are arranged on the inner wall of the sleeve.

[0009] Furthermore, an axial pressure equalizing groove and a first O-ring are provided on the outer wall of the sleeve. The axial pressure equalizing groove is provided at the end close to the spring, the first O-ring is provided at the end away from the spring, and a second O-ring is provided at the circumferential connection between the liquid inlet valve body and the stuffing box body.

[0010] Furthermore, the end surface of the liquid inlet valve body that contacts the stuffing box body is configured as a conical surface to form a metal-to-metal contact seal.

[0011] Furthermore, two axial pressure equalizing grooves are symmetrically arranged on the outer wall of the sleeve.

[0012] Furthermore, a first axial flow channel is provided on the stuffing box body, a radial flow channel with an open end, and a second axial flow channel connecting the first axial flow channel and the radial flow channel are provided on the stuffing cover, the open end of the radial flow channel is connected to a water tank, and the stuffing cover is also provided with a third axial flow channel and a fourth axial flow channel connecting the radial flow channel and the annular cavity, which are used for cooling water to flow into and out of the annular cavity respectively; a grid ring is provided between the stuffing cover and the plunger, and the grid ring is provided on one side of the radial flow channel and away from the side of the annular cavity; a channel for providing cooling liquid to the first axial flow channel is provided on the cylinder body.

[0013] Furthermore, a third O-ring is provided at both ends of the first axial flow channel, and a fourth O-ring is provided on the end surface of the stuffing box body that contacts the stuffing gland.

[0014] Furthermore, the third axial flow channel is close to the plunger and is arranged in a circular ring shape. A disc flow channel is arranged on the end surface of the stuffing box body and in contact with the stuffing gland. The diameter of the disc flow channel is smaller than the inner diameter of the fourth O-ring. The disc flow channel is concentric with the plunger and communicates with the annular cavity. The fourth axial flow channel connects the disc flow channel and the radial flow channel.

[0015] Furthermore, seven labyrinth pressure relief annular grooves are provided on the inner wall of the sleeve.

[0016] Furthermore, the stuffing box body and the stuffing gland are fixed to the cylinder body in sequence by tightening bolts.

[0017] Furthermore, two packing rings are provided.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention provides a plurality of labyrinth pressure relief annular grooves on the inner wall of the sleeve. When the medium in the ultra-high pressure reciprocating pump flows through the gap between the plunger and the sleeve, the pressure is reduced at each labyrinth pressure relief annular groove. After the pressure is gradually relieved by the multiple labyrinth pressure relief annular grooves, the pressure is significantly reduced. The packing ring seal further seals the pressure, thereby greatly enhancing the sealing effect of the ultra-high pressure reciprocating pump. The invention is applicable to sealing in working environments exceeding 140MPa.

[0020] 2. The present invention provides two symmetrical axial pressure-equalizing grooves on the outer wall of the sleeve. The high-pressure medium enters the groove-shaped space outside the sleeve through the axial pressure-equalizing grooves. When the inside of the sleeve has a tendency to expand due to the pressure of the medium, the outside of the sleeve is also subjected to pressure to prevent the sleeve from undergoing large elastic deformation, thereby preventing the sealing failure due to excessive gap between the sleeve and the plunger.

[0021] 3. The present invention sets up cooling channels, and cooling water flows through the first axial channel → the second axial channel → the radial channel → the third axial channel → the annular cavity → the disc channel → the fourth axial channel → the radial channel in sequence, and finally flows to the water tank. When the cooling water flows through the annular cavity, the packing ring and the plunger friction pair are cooled, and the cooling water with heat returns to the water tank. At the same time, a small amount of leaked high-pressure medium also returns to the water tank through the cooling channel, so as to avoid frictional heating that makes the packing ring soften and reduces its wear resistance, thereby improving the service life of the packing ring.

[0022] 4. In the present invention, a combined sealing form of metal-to-metal cone-angle contact sealing and O-ring sealing is adopted between the liquid inlet valve body and the stuffing box body, as well as between the stuffing box body and the stuffing gland, to seal the medium in the axial pressure equalizing groove and the cooling water respectively. The metal-to-metal cone-angle contact seal is a sealing pair formed by a metal edge with a cone angle and a metal plane. The stuffing box body and the stuffing gland are tightened by fastening bolts, and the contact surfaces of the liquid inlet valve body and the stuffing box body or the stuffing box body and the stuffing gland undergo plastic deformation and fit tightly, so that the gap between the contact surfaces of the liquid inlet valve body and the stuffing box body or the stuffing box body and the stuffing gland becomes very small, thereby achieving a sealing effect. The cone-angle contact makes the contact surface smaller and more prone to plastic deformation. In addition, the first O-ring seals the medium in the axial pressure equalizing groove, and the third O-ring and the Gly ring seal the cooling water.

[0023] 5. The present invention solves the sealing problem of ultra-high pressure plunger reciprocating pumps by using a combined dynamic seal of gap seal plus packing seal and a combined static seal of metal-to-metal cone contact seal plus O-ring seal, thereby greatly improving the reliability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the ultra-high pressure gap filler combined reciprocating sealing device of the present invention.

[0025] Figure 2 Schematic diagram of the cooling channel in the present invention.

[0026] Figure 3 It is an enlarged schematic diagram of the plunger in the present invention.

[0027] In the figure, 1. liquid cylinder body; 2. liquid inlet valve body; 3. plunger; 4. stuffing box body; 41. first axial flow channel; 42. disc flow channel; 5. stuffing gland; 51. second axial flow channel; 52. radial flow channel; 53. third axial flow channel; 54. fourth axial flow channel; 6. sleeve; 61. labyrinth pressure relief annular groove; 62. axial pressure equalizing groove; 7. spring; 8. packing ring; 9. support ring; 10. guide sleeve; 11. fastening bolt; 121. first O-ring; 122. second O-ring; 123. third O-ring; 124. fourth O-ring; 13. Gly ring; 14. annular cavity. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the specific embodiments of the drawings, but the protection scope of the present invention is not limited thereto.

[0029] Combine Figure 1-Figure 3As shown, the ultra-high-pressure gap packing combined reciprocating sealing device includes a liquid inlet valve body 2 and a stuffing box body 4 fixed on the liquid cylinder body 1, a stuffing gland 5 fixed at one end of the stuffing box body 4, a plunger 3, and a sleeve 6. The stuffing box body 4 and the stuffing gland 5 are fixed to the liquid cylinder body 1 in sequence by fastening bolts 11. The inner diameter of the sleeve 6 is slightly larger than the diameter of the plunger 3. The stuffing box body 4 is provided with a through hole slightly larger than the outer diameter of the sleeve 6 and used for mounting the sleeve 6. The liquid inlet valve body 2 is provided with a stepped hole. The large end of the stepped hole on the liquid inlet valve body 2 is slightly larger than the outer diameter of the sleeve 6 and used for mounting the sleeve 6, and the small end is slightly larger than the diameter of the plunger 3. The stuffing gland 5 is provided with a through hole slightly larger than the diameter of the plunger 3. The through hole on the stuffing gland 5, the through hole on the stuffing box body 4, the stepped hole on the liquid inlet valve body 2, the sleeve 6 and the plunger 3 are all coaxially arranged.

[0030] The stuffing box body 4 is fixed on one side of the liquid inlet valve body 2, and the plunger 3 passes through and movably connects the through hole on the stuffing gland 5, the through hole on the stuffing box body 4, and the stepped hole on the liquid inlet valve body 2 in sequence. An annular cavity 14 is formed between the large end of the stepped hole on the liquid inlet valve body 2, the through hole on the stuffing box body 4 and the plunger 3. The spring 7, sleeve 6, support ring 9, packing ring 8, support ring 9, and guide sleeve 10 are arranged in sequence in the annular cavity 14. There are two packing rings 8. The spring 7 is close to the shoulder of the stepped hole on the liquid inlet valve body 2, and the guide sleeve 10 is close to the stuffing gland 5. The sleeve 6, support ring 9, packing ring 8, support ring 9 and guide sleeve 10 are confined in the annular cavity 14 by the elastic force generated by the deformation of the spring 7.

[0031] Seven labyrinth pressure relief annular grooves 61 are provided on the inner wall of the sleeve 6. When the medium in the ultra-high pressure reciprocating pump flows through the gap between the plunger and the sleeve, the pressure is reduced at each labyrinth pressure relief annular groove. After the pressure is gradually relieved through multiple labyrinth pressure relief annular grooves, the pressure is greatly reduced, and then further sealed by the packing ring, which greatly enhances the sealing effect of the ultra-high pressure reciprocating pump. Two axial pressure-equalizing grooves 62 and a first O-ring 121 are symmetrically provided on the outer wall of the sleeve 6. The axial pressure-equalizing groove 62 is provided at one end close to the spring 7, and the first O-ring 121 is provided at the end away from the spring 7. The high-pressure medium enters the groove-shaped space outside the sleeve through the axial pressure-equalizing groove. When the sleeve is subjected to the pressure of the medium and tends to expand, the outside of the sleeve is also subjected to pressure to prevent the sleeve from undergoing large elastic deformation, thereby preventing the sealing failure caused by the excessive gap between the sleeve and the plunger; a second O-ring 122 is provided at the circumferential connection between the liquid inlet valve body 2 and the stuffing box body 4, and the end face of the liquid inlet valve body 2 in contact with the stuffing box body 4 is provided as a conical surface, forming a metal-to-metal cone-angle contact seal with the end face of the stuffing box body 4. The metal-to-metal cone-angle contact seal is a sealing pair formed by a metal edge with a cone angle and a metal plane, which can form a good sealing effect on ultra-high-pressure media. The sealing form formed in combination with the O-ring seal greatly enhances the reliability of the ultra-high-pressure static seal.

[0032] The stuffing box body 4 is provided with a first axial flow channel 41, and a third O-ring 123 is provided at both ends of the first axial flow channel 41. The stuffing gland 5 is provided with a radial flow channel 52 with one end open, and a second axial flow channel 51 connecting the first axial flow channel 41 and the radial flow channel 52. The open end of the radial flow channel 52 is connected to the water tank. The stuffing gland 5 is also provided with a third axial flow channel 53 and a fourth axial flow channel 54 connecting the radial flow channel 52 and the annular cavity 14, which are respectively used for cooling water. Flows into and out of the annular cavity 14; a fourth O-ring 124 is provided on the end surface of the stuffing box body 4 in contact with the stuffing gland 5; the third axial flow channel 53 is close to the plunger 3 and is arranged in a circular ring shape, and a disc flow channel 42 is provided on the end surface of the stuffing box body 4 in contact with the stuffing gland 5. The diameter of the disc flow channel 42 is smaller than the inner diameter of the fourth O-ring 124. The disc flow channel 42 is concentric with the plunger 3 and communicates with the annular cavity 14. The fourth axial flow channel 54 connects the disc flow channel 42 and Radial flow channel 52; a conical protrusion is provided on the end face of the stuffing box body 4 and on the outermost side of the disc flow channel 42, forming a metal-to-metal cone-angle contact seal with the end face of the stuffing cover 5. The metal-to-metal cone-angle contact seal can form a good sealing effect on ultra-high pressure media, and the sealing form formed by the combination with the O-ring seal greatly enhances the reliability of the ultra-high pressure static seal; a grid ring 13 is provided between the stuffing cover 5 and the plunger 3, and the grid ring 13 is provided on one side of the radial flow channel 52 and away from the side of the annular cavity 14; a channel for providing coolant to the first axial flow channel 41 is provided on the cylinder body 1; the cooling water flows through the first axial flow channel → the second axial flow channel → the radial flow channel → the third axial flow channel → the annular cavity → the disc flow channel → the fourth axial flow channel → the radial flow channel in sequence, and finally flows to the water tank, wherein the cooling water cools the packing ring and the plunger friction pair when flowing through the annular cavity, and the cooling water with heat returns to the water tank. At the same time, a small amount of high-pressure medium that leaks also returns to the water tank through the cooling flow channel.

[0033] The examples are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention are within the scope of protection of the present invention.

Claims

1. An ultra-high pressure gap filler combined reciprocating sealing device, characterized by: The invention comprises a liquid inlet valve body (2) and a stuffing box body (4) fixed on a liquid cylinder body (1), a stuffing gland (5) fixed on one end of the stuffing box body (4), a plunger (3), and a sleeve (6). The inner diameter of the sleeve (6) is slightly larger than the diameter of the plunger (3). The stuffing box body (4) is provided with a through hole slightly larger than the outer diameter of the sleeve (6) and used for installing the sleeve (6). The liquid inlet valve body (2) is provided with a stepped hole. The large end of the stepped hole on the liquid inlet valve body (2) is slightly larger than the outer diameter of the sleeve (6) and used for installing the sleeve (6), and the small end is slightly larger than the diameter of the plunger (3). The stuffing gland (5) is provided with a through hole slightly larger than the diameter of the plunger (3). The through hole on the stuffing gland (5), the through hole on the stuffing box body (4), the stepped hole on the liquid inlet valve body (2), the sleeve (6) and the plunger (3) are all coaxially arranged. The stuffing box body (4) is fixed on one side of the liquid inlet valve body (2), and the plunger (3) sequentially penetrates and movably connects the through hole on the stuffing gland (5), the through hole on the stuffing box body (4), and the stepped hole on the liquid inlet valve body (2). An annular cavity (14) is formed between the large end of the stepped hole on the liquid inlet valve body (2), the through hole on the stuffing box body (4), and the plunger (3). A spring (7), a sleeve (6), a support ring (9), a stuffing ring (8), a support ring (9), and a guide sleeve (10) are sequentially arranged in the annular cavity (14). The spring (7) is adjacent to the shoulder of the stepped hole on the liquid inlet valve body (2), and the guide sleeve (10) is adjacent to the stuffing gland (5). The sleeve (6), the support ring (9), the stuffing ring (8), the support ring (9), and the guide sleeve (10) are confined in the annular cavity (14) by the elastic force generated by the deformation of the spring (7); A plurality of labyrinth pressure relief annular grooves (61) are provided on the inner wall of the sleeve (6).

2. The ultra-high pressure gap filler combined reciprocating sealing device according to claim 1, characterized in that: An axial pressure-equalizing groove (62) and a first O-type sealing ring (121) are provided on the outer wall of the sleeve (6); the axial pressure-equalizing groove (62) is provided at an end close to the spring (7); the first O-type sealing ring (121) is provided at an end away from the spring (7); and a second O-type sealing ring (122) is provided at the circumferential connection between the liquid inlet valve body (2) and the stuffing box body (4).

3. The ultra-high pressure gap filler combined reciprocating sealing device according to claim 2, characterized in that: The end surface of the liquid inlet valve body (2) in contact with the stuffing box body (4) is arranged as a conical surface, forming a metal-to-metal conical angle contact seal with the end surface of the stuffing box body (4).

4. The ultra-high pressure gap filler combined reciprocating sealing device according to claim 2, characterized in that: Two axial pressure equalizing grooves (62) are symmetrically arranged on the outer wall of the sleeve (6).

5. The ultra-high pressure gap filler combined reciprocating sealing device according to claim 1, characterized in that: The stuffing box body (4) is provided with a first axial flow channel (41), the stuffing gland (5) is provided with a radial flow channel (52) with one end open, and a second axial flow channel (51) connecting the first axial flow channel (41) and the radial flow channel (52), the open end of the radial flow channel (52) is connected to a water tank, and the stuffing gland (5) is also provided with a third axial flow channel (53) and a fourth axial flow channel (54) connecting the radial flow channel (52) and the annular cavity (14), respectively used for cooling water to flow into and out of the annular cavity (14); a grid ring (13) is provided between the stuffing gland (5) and the plunger (3), and the grid ring (13) is provided on one side of the radial flow channel (52) and away from the side of the annular cavity (14); and a channel for providing cooling liquid for the first axial flow channel (41) is provided on the cylinder body (1).

6. The ultra-high pressure gap filler combined reciprocating sealing device according to claim 5, characterized in that: A third O-type sealing ring (123) is provided at both ends of the first axial flow channel (41), and a fourth O-type sealing ring (124) is provided on the end surface of the stuffing box body (4) that contacts the stuffing gland (5).

7. The ultra-high pressure gap filler combined reciprocating sealing device according to claim 6, characterized in that: The third axial flow channel (53) is closely attached to the plunger (3) and is arranged in an annular shape. A disc flow channel (42) is arranged on the end surface of the stuffing box body (4) that contacts the stuffing gland (5). The diameter of the disc flow channel (42) is smaller than the inner diameter of the fourth O-ring (124). The disc flow channel (42) is concentric with the plunger (3) and communicates with the annular cavity (14). The fourth axial flow channel (54) communicates with the disc flow channel (42) and the radial flow channel (52).

8. The ultra-high pressure gap filler combined reciprocating sealing device according to claim 7, characterized in that: A conical protrusion is provided on the end surface of the stuffing box body (4) and on the outermost side of the disc flow channel (42), forming a metal-to-metal cone angle contact seal with the end surface of the stuffing gland (5).

9. The ultra-high pressure gap filler combined reciprocating sealing device according to claim 1, characterized in that: Seven labyrinth pressure relief annular grooves (61) are provided on the inner wall of the sleeve (6); and two packing rings (8) are provided.

10. The ultra-high pressure gap filler combined reciprocating sealing device according to claim 1, characterized in that: The stuffing box body (4) and the stuffing gland (5) are fixed to the cylinder body (1) in sequence by tightening bolts (11).

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