Low-temperature-resistant tandem type mechanical sealing device for pump

Abstract

The utility model belongs to the field of sealing equipment, and particularly relates to a low-temperature-resistant tandem mechanical sealing device for a pump, which comprises a pump body, a gland and a shaft sleeve, a mounting groove is arranged on one side of the pump body, the gland is mounted on one side of the pump body, the shaft sleeve is mounted on the gland, one end of the shaft sleeve extends into the mounting groove, and a shaft sleeve seat is mounted at the other end of the shaft sleeve. A sealing seat is mounted on one side of the gland and matched with the mounting groove, a T-shaped sealing gasket is mounted on one side of the sealing seat, a sliding plate is slidably mounted on the outer side of the shaft sleeve in a sealed mode, an extrusion mechanism is arranged between the sliding plate and the T-shaped sealing gasket, and a sealing assembly is arranged between the sliding plate and the mounting groove and between the sliding plate and the shaft sleeve. The extrusion mechanism comprises a push rod and an annular pressing plate. The sealing structure is reasonable in design, when a low-temperature medium is rapidly vaporized to increase the pressure intensity, the air pressure can push the annular pressing plate to extrude the T-shaped sealing gasket, the sealing performance of the sealing seat and the pump body can be improved, and continuous leakage of the medium is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing equipment, in particular to a low-temperature resistant series-type mechanical sealing device for a pump. Background Art

[0002] There are various variations in the specific implementation structure of the mechanical seal device, and the specific structure of the mechanical seal device is different according to the operating conditions.

[0003] The mechanical seal device for cryogenic pumps is a key device to ensure the safe operation of the pump. The friction heat of the sealing end face of the common mechanical seal device will cause the temperature of the sealing end face to rise to a temperature exceeding the critical temperature of the medium. At this time, the medium on the sealing end face is in a vaporized state, which makes the seal ineffective. When the seal leaks, the leaked medium quickly vaporizes and absorbs heat, causing the temperature of the seal to further decrease, and the seal leakage will be more severe due to uneven temperature, resulting in a large amount of seal leakage.

[0004] Moreover, the mechanical sealing device used for cryogenic pumps has very high requirements on the low-temperature resistance of the sealing ring material on the device. The sliding sealing rings used in the mechanical sealing devices of the prior art need to be imported and are very expensive, which greatly increases the manufacturing cost of the mechanical sealing device. Therefore, we proposed a low-temperature resistant tandem mechanical sealing device for pumps to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a low-temperature resistant series mechanical sealing device for a pump.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A low-temperature resistant tandem mechanical seal device for a pump comprises a pump body, a gland and a shaft sleeve, wherein one side of the pump body is provided with a mounting groove, the gland is mounted on one side of the pump body, the shaft sleeve is mounted on the gland, and one end of the shaft sleeve extends into the mounting groove, and the other end of the shaft sleeve is mounted with a shaft sleeve seat;

[0008] A sealing seat is installed on one side of the pressure cover, and the sealing seat is adapted to the mounting groove. A T-shaped sealing gasket is installed on one side of the sealing seat. A sliding plate is installed on the outer side of the sleeve for sealing sliding. An extrusion mechanism is provided between the sliding plate and the T-shaped sealing gasket, and a sealing assembly is provided between the sliding plate and the mounting groove and the sleeve.

[0009] Preferably, the extrusion mechanism includes a push rod and an annular pressure plate, one end of the push rod is fixedly mounted on the sliding plate, the other ends of the plurality of push rods are fixedly mounted with the same annular pressure plate, and the annular pressure plate is adapted to the T-shaped sealing gasket.

[0010] Preferably, a plurality of connecting seats are installed in a circular shape at equal intervals on the inner wall of the installation groove, guide holes are opened on the connecting seats, and the push rods are slidably connected to the corresponding guide holes.

[0011] Preferably, a compression spring is fixedly mounted on one side of the connecting seat, and the other end of the compression spring is fixedly mounted on the annular pressure plate.

[0012] Preferably, the sealing assembly comprises a groove and a sealing ring, the groove is opened on the outer side and inner wall of the sliding plate, and the sealing ring is installed in the groove.

[0013] Preferably, a sealing liquid groove is provided on the gland, and the sealing liquid groove is filled with sealing liquid.

[0014] Preferably, a filling hole is provided on the top inner wall of the sealing liquid tank, and a sealing mechanism is provided in the filling hole.

[0015] Preferably, the sealing mechanism comprises an internal threaded hole, a sealing screw and a knob, the internal threaded hole is formed on the inner wall of the filling hole, the sealing screw is installed on the internal thread of the internal threaded hole, and a knob is fixedly installed on one end of the sealing screw.

[0016] Beneficial effects of the utility model:

[0017] 1. By turning the knob and the sealing screw, the sealing screw can be screwed in or out of the filling hole, so as to facilitate the filling of the sealing liquid into the sealing liquid tank. The sealing liquid can increase the sealing performance of the shaft sleeve, and the cooperation of the sealing seat and the T-shaped sealing gasket can increase the sealing performance of the gland and the pump body;

[0018] 2. When the sleeve leaks into the installation groove, the low-temperature medium vaporizes quickly, causing the pressure on one side of the sliding plate to increase. At this time, the air pressure pushes the sliding plate to move to the right. The sliding plate drives the annular pressure plate through the push rod to squeeze the T-shaped sealing gasket, which can increase the sealing performance between the sealing seat and the pump body and prevent further leakage of the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a low-temperature resistant tandem mechanical seal device for a pump proposed by the utility model;

[0020] Figure 2 This is a schematic diagram of the main structure of the low-temperature resistant tandem mechanical seal device for a pump proposed by the utility model;

[0021] Figure 3 This is a schematic structural diagram of part A of the low-temperature resistant tandem mechanical seal device for a pump proposed by the utility model;

[0022] Figure 4 This is a schematic structural diagram of part B of the low-temperature resistant tandem mechanical seal device for a pump proposed by the utility model;

[0023] Figure 5 The utility model is a schematic diagram of the three-dimensional structure of the T-shaped sealing gasket of the low-temperature resistant tandem mechanical sealing device for the pump.

[0024] In the figure: 1. pump body; 2. gland; 3. mounting groove; 4. sleeve; 5. sleeve seat; 6. sealing seat; 7. T-shaped sealing gasket; 8. sliding plate; 9. push rod; 10. annular pressure plate; 11. connecting seat; 12. guide hole; 13. compression spring; 14. sealing assembly; 15. sealing liquid tank; 16. filling hole; 17. internal threaded hole; 18. sealing screw; 19. knob. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Reference Figure 1-5 A low-temperature resistant tandem mechanical sealing device for a pump comprises a pump body 1, a gland 2 and a sleeve 4. A mounting groove 3 is provided on one side of the pump body 1. The gland 2 is installed on one side of the pump body 1. The sleeve 4 is installed on the gland 2, and one end of the sleeve 4 extends into the mounting groove 3. A sleeve seat 5 is installed on the other end of the sleeve 4. A sealing seat 6 is installed on one side of the gland 2, and the sealing seat 6 is matched with the mounting groove 3. A T-shaped sealing gasket 7 is installed on one side of the sealing seat 6. A sliding plate 8 is installed on the outer side of the sleeve 4 for sealing sliding. An extrusion mechanism is provided between the sliding plate 8 and the T-shaped sealing gasket 7, and a sealing assembly 14 is provided between the sliding plate 8 and the mounting groove 3 and the sleeve 4.

[0027] In this embodiment, the extrusion mechanism includes a push rod 9 and an annular pressure plate 10, one end of the push rod 9 is fixedly mounted on the sliding plate 8, and the other ends of multiple push rods 9 are fixedly mounted with the same annular pressure plate 10, and the annular pressure plate 10 is adapted to the T-shaped sealing gasket 7, and multiple connecting seats 11 are installed on the inner wall of the mounting groove 3 in a circular shape with equal intervals, and a guide hole 12 is opened on the connecting seat 11, and the push rod 9 is slidingly connected to the corresponding guide hole 12, and a compression spring 13 is fixedly mounted on one side of the connecting seat 11, and the other end of the compression spring 13 is fixedly mounted on the annular pressure plate 10. When the shaft sleeve 4 leaks into the mounting groove 3, the low-temperature medium vaporizes rapidly, so that the pressure on one side of the sliding plate 8 increases. At this time, the air pressure pushes the sliding plate 8 to move to the right, and the sliding plate 8 drives the annular pressure plate 10 through the push rod 9 to squeeze the T-shaped sealing gasket 7, which can increase the sealing performance of the sealing seat 6 and the pump body 1 and prevent the medium from continuing to leak.

[0028] In this embodiment, the sealing assembly 14 includes a groove and a sealing ring. The groove is opened on the outer side and inner wall of the sliding plate 8 , and the sealing ring is installed in the groove, which can increase the sealing performance of the sliding plate 8 .

[0029] In this embodiment, a sealing liquid groove 15 is provided on the pressure cover 2, and the sealing liquid groove 15 is filled with sealing liquid. A filling hole 16 is provided on the top inner wall of the sealing liquid groove 15, and a sealing mechanism is provided in the filling hole 16. The sealing mechanism includes an internal threaded hole 17, a sealing screw 18 and a knob 19. The internal threaded hole 17 is provided on the inner wall of the filling hole 16, and a sealing screw 18 is installed on the internal thread of the internal threaded hole 17. A knob 19 is fixedly installed on one end of the sealing screw 18. By rotating the knob 19 and the sealing screw 18, the sealing screw 18 can be screwed into or out of the filling hole 16, thereby facilitating the filling of sealing liquid into the sealing liquid groove 15. The sealing liquid can increase the sealing performance of the sleeve 4.

[0030] In the utility model, by rotating the knob 19 and the sealing screw 18, the sealing screw 18 can be screwed into or out of the filling hole 16, so as to facilitate the filling of the sealing liquid in the sealing liquid tank 15. The sealing liquid can increase the sealing performance of the shaft sleeve 4, and the cooperation of the sealing seat 6 and the T-shaped sealing gasket 7 can increase the sealing performance of the gland 2 and the pump body 1. When the shaft sleeve 4 leaks into the mounting groove 3, the low-temperature medium vaporizes rapidly, causing the pressure on one side of the sliding plate 8 to increase. At this time, the air pressure pushes the sliding plate 8 to move to the right, and the sliding plate 8 drives the annular pressure plate 10 to squeeze the T-shaped sealing gasket 7 through the push rod 9, which can increase the sealing performance of the sealing seat 6 and the pump body 1 and prevent the medium from continuing to leak.

[0031] The above is a detailed introduction to the low-temperature resistant tandem mechanical seal device for pumps provided by the utility model. This article uses specific embodiments to explain the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A low temperature resistant series mechanical seal device for a pump, characterized in that: The pump comprises a pump body (1), a gland (2) and a shaft sleeve (4), wherein a mounting groove (3) is provided on one side of the pump body (1), the gland (2) is mounted on one side of the pump body (1), the shaft sleeve (4) is mounted on the gland (2), and one end of the shaft sleeve (4) extends into the mounting groove (3), and a shaft sleeve seat (5) is mounted on the other end of the shaft sleeve (4); A sealing seat (6) is installed on one side of the gland (2), and the sealing seat (6) is matched with the mounting groove (3). A T-shaped sealing gasket (7) is installed on one side of the sealing seat (6). A sliding plate (8) is installed on the outer side of the shaft sleeve (4) for sealing sliding. An extrusion mechanism is provided between the sliding plate (8) and the T-shaped sealing gasket (7), and a sealing assembly (14) is provided between the sliding plate (8) and the mounting groove (3) and the shaft sleeve (4).

2. The low temperature resistant tandem mechanical seal device for a pump according to claim 1, characterized in that: The extrusion mechanism comprises a push rod (9) and an annular pressure plate (10), one end of the push rod (9) is fixedly mounted on the sliding plate (8), the other ends of a plurality of push rods (9) are fixedly mounted with the same annular pressure plate (10), and the annular pressure plate (10) is adapted to the T-shaped sealing gasket (7).

3. The low temperature resistant tandem mechanical seal device for a pump according to claim 1, characterized in that: A plurality of connecting seats (11) are installed in an annular shape at equal intervals on the inner wall of the installation groove (3); guide holes (12) are provided on the connecting seats (11), and the push rods (9) are slidably connected to the corresponding guide holes (12).

4. The low temperature resistant tandem mechanical seal device for a pump according to claim 3, characterized in that: A compression spring (13) is fixedly mounted on one side of the connecting seat (11), and the other end of the compression spring (13) is fixedly mounted on the annular pressure plate (10).

5. The low temperature resistant tandem mechanical seal device for a pump according to claim 1, characterized in that: The sealing assembly (14) comprises a groove and a sealing ring. The groove is formed on the outer side and the inner wall of the sliding plate (8), and the sealing ring is installed in the groove.

6. The low temperature resistant tandem mechanical seal device for a pump according to claim 1, characterized in that: The gland (2) is provided with a sealing liquid groove (15), and the sealing liquid groove (15) is filled with sealing liquid.

7. The low temperature resistant tandem mechanical seal device for a pump according to claim 6, characterized in that: A filling hole (16) is provided on the top inner wall of the sealing liquid tank (15), and a sealing mechanism is provided in the filling hole (16).

8. The low temperature resistant tandem mechanical seal device for a pump according to claim 7, characterized in that: The sealing mechanism comprises an internal threaded hole (17), a sealing screw (18) and a knob (19); the internal threaded hole (17) is formed on the inner wall of the filling hole (16); the sealing screw (18) is internally threadedly mounted in the internal threaded hole (17); and the knob (19) is fixedly mounted on one end of the sealing screw (18).

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