Mechanical sealing structure and system for multiphase pump

Abstract

The utility model discloses a mechanical sealing structure for a multiphase pump, which belongs to the technical field of mechanical sealing, and comprises a rotating part, a static part and a sealing assembly which jointly form a sealing cavity, and further comprises a spiral sleeve which is sleeved outside the rotating part and is coaxially arranged with the rotating part, the spiral sleeve is located in the sealing cavity, and the spiral sleeve and the rotating piece rotate synchronously. A circulation loop is formed between the sealing system and the sealing cavity, and spacer fluid flows in the circulation loop; driving force is provided for flowing of the spacer fluid through rotating movement of the spiral sleeve so that the spacer fluid can forcibly and automatically flow in a circulating mode and take away heat generated by the sealing end face, and the temperature of the sealing spacer fluid is reduced through the heat dissipation effect of the sealing auxiliary system so that the pressure of the spacer fluid can be controlled and guaranteed. The operation temperature and the necessary pressure required by sealing are guaranteed, and the purposes of sealing safety and stable operation are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical seals, and in particular relates to a mechanical seal structure and system for a multiphase pump. Background Art

[0002] In the petroleum refining and chemical industries, more than 85% of the rotating equipment for conveying liquid media uses mechanical seals. Especially in the process of oil and gas extraction and transportation, because the extracted oil and gas have complex components, including different phases such as liquid, gas and solid, and it is also a field operation, the mechanical seal is required to have the characteristics of high reliability, long life, low wear and maintenance-free.

[0003] Therefore, it is very important to have a complete set of mechanical seal structure and supporting seal auxiliary system used in the field environment. It requires that the sealing isolation fluid can circulate automatically to take away the heat generated by the sealing end face, and reduce the temperature of the isolation fluid through the sealing auxiliary system, so that the sealing working temperature and the pressure of the isolation fluid are controlled within the permitted range. Utility Model Content

[0004] In view of this, in order to solve the above-mentioned problems existing in the prior art, the purpose of the utility model is to provide a mechanical seal structure and system for a multiphase pump so that the isolation fluid can be forced to circulate automatically and take away the heat generated by the sealing end face, and the temperature of the sealing isolation fluid can be reduced by the heat dissipation effect of the sealing auxiliary system to control and ensure the pressure of the isolation fluid, ensure the operating temperature and necessary pressure required for the seal, and achieve the purpose of safe and stable operation of the seal.

[0005] The technical solution adopted by the utility model is: a mechanical seal structure for a multiphase pump, comprising a rotating part, a stationary part and a sealing assembly sleeved outside the rotating part, wherein the rotating part, the stationary part and the sealing assembly together constitute a sealing cavity, and further comprising:

[0006] A spiral sleeve is sleeved on the outside of the rotating member and is coaxially arranged with the rotating member, the spiral sleeve is located inside the sealing cavity, and the spiral sleeve and the rotating member rotate synchronously;

[0007] A sealing system, wherein a circulation loop is formed between the sealing system and the sealing cavity, and an isolation liquid flows in the circulation loop;

[0008] The rotational movement of the spiral sleeve provides driving force for the flow of the isolation fluid.

[0009] Furthermore, a plurality of rectangular threads are provided on the outer wall of the spiral sleeve. The function of the spiral sleeve is to force the isolation liquid in the sealing cavity to flow, so that the isolation liquid automatically flows and circulates between the sealing cavity and the sealing system. The isolation liquid coming out of the sealing system is cooled by heat to reduce the temperature of the isolation liquid, thereby ensuring the stable and normal operation of the seal.

[0010] Furthermore, the sealing assembly comprises:

[0011] A moving ring sleeved on the outside of the rotating member, wherein the moving ring is provided with a spring for driving the moving ring to slide;

[0012] A stationary ring is sealed and assembled with the dynamic ring, and the stationary ring is limited by a stationary member.

[0013] Furthermore, a first sealing ring is provided between the dynamic ring and the rotating part, and a second sealing ring is provided between the stationary ring and the stationary part.

[0014] Furthermore, at least one positioning sleeve is provided between the spiral sleeve and the rotating member, and a locking screw is provided inside each positioning sleeve.

[0015] Furthermore, the mechanical sealing structure further comprises: a transmission shaft sleeve, wherein the transmission shaft sleeve is sleeved between the rotating member and the spiral sleeve, and a positioning hole is provided in the radial direction of the transmission shaft sleeve, and the positioning sleeve is installed in the positioning hole.

[0016] Furthermore, the transmission sleeve and the dynamic ring are limited by a clamping ring.

[0017] Furthermore, a water inlet channel and a water outlet channel are provided in the stationary part, and a circulation loop is formed by the sealing system, the water inlet channel, the water outlet channel and the sealing cavity.

[0018] The utility model also discloses a mechanical sealing system for a multiphase pump. The mechanical sealing system comprises the multiphase pump. The mechanical sealing system also comprises the mechanical sealing structure for the multiphase pump as described above.

[0019] The beneficial effects of the utility model are:

[0020] 1. The mechanical seal structure for a multiphase pump provided by the utility model is adopted. By adding a spiral sleeve in the sealing chamber, when the shaft rotates, the spiral sleeve is driven to rotate through the rotating member. The driving action of the spiral sleeve can drive the isolation liquid in the sealing chamber to be sent out, and the temperature is cooled through the sealing system to effectively control the temperature of the isolation liquid, and then the pressure of the isolation liquid can be controlled and guaranteed to ensure the operating temperature and necessary pressure required by the sealing structure, so as to realize the safe and stable operation of the mechanical seal structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the mechanical seal structure for a multiphase pump provided by the utility model;

[0022] Figure 2 yes Figure 1 A local enlarged schematic diagram of the middle A;

[0023] Figure 3 yes Figure 1 An enlarged schematic diagram of the interior of the middle sealing cavity;

[0024] The following are marked in the attached figure:

[0025] 1-rotating part; 2-sealing surface; 3-spiral sleeve; 4-moving ring; 5-stationary ring; 6-stationary part; 7-sealing system; 8-transmission sleeve; 9-clamping ring; 10-spring; 11-sealing chamber; 12-positioning sleeve; 13-locking screw. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0029] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, not all of the embodiments. The components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Example 1

[0031] In this embodiment, a mechanical seal structure for a multiphase pump is specifically disclosed, which is intended to reduce the seal operating temperature by automatically circulating the sealing isolation fluid and dissipating heat through the heat exchange device of the sealing system 7, and to control the pressure of the isolation fluid to meet the use requirements of the mechanical seal, thereby extending the service life of the mechanical seal.

[0032] like Figure 1-Figure 3 As shown, the mechanical seal structure can effectively take away the heat generated by the sealing end face. Specifically, the mechanical seal structure includes a rotating member 1, a stationary member 6 and a sealing assembly sleeved on the outside of the rotating member 1, wherein the rotating member 1, the stationary member 6 and the sealing assembly are all existing accessories on the sealing structure of the prior art. The rotating member 1 is installed on the main shaft of the multiphase pump, and the rotating member 1 can rotate synchronously with the main shaft; the stationary member 6 is a part of the mechanical seal structure, which is mainly used to provide a limiting function for the stationary ring 5; the sealing assembly includes: a stationary ring 5 and a dynamic ring 4, and a sealing assembly is provided between the stationary ring 5 and the dynamic ring 4, and the stationary ring 5 and the dynamic ring 4 are both sleeved on the outside of the rotating member 1; in the mechanical seal structure of this embodiment, a pair of sealing assemblies are symmetrically arranged relative to the middle of the rotating member 1, and a spring 10 is arranged between the opposite ends of the two dynamic rings 4, and the dynamic ring 4 is driven to slide by the spring 10, so that the contact surface between the dynamic ring 4 and the stationary ring can form a sealing surface 2, and the stationary ring 5 is limited by the stationary member 6.

[0033] The rotating part 1, the stationary part 6 and the sealing assembly together constitute a sealing chamber 11, and a spiral sleeve 3 is arranged in the sealing chamber 11. The spiral sleeve 3 is sleeved on the outside of the rotating part 1 and the spiral sleeve 3 and the rotating part 1 are coaxially arranged, and the spiral sleeve 3 and the rotating part 1 rotate synchronously. Specifically, at least one positioning sleeve 12 is arranged between the spiral sleeve 3 and the rotating part 1. In this embodiment, taking the design of a positioning sleeve 12 as an example, a groove is opened on the side wall of the spiral sleeve 3 and the rotating part 1, and the two ends of the positioning sleeve 12 are respectively embedded in the grooves on the spiral sleeve 3 and the rotating part 1. At the same time, a locking screw 13 is provided inside the positioning sleeve 12, and the spiral sleeve 3 and the rotating part 1 are fixedly connected as a whole by the locking screw 13, so that the spiral sleeve 3 and the rotating part 1 can rotate synchronously. Since a plurality of rectangular threads are arranged on the outer wall of the spiral sleeve 3, it can provide driving force for the flow of the isolation fluid under the rotation movement of the spiral sleeve 3. A spiral sleeve 3 with a pumping effect is added to the sealing structure. It is fixed on the rotating part 1 of the mechanical sealing structure and rotates together. Its function is to drive the isolation liquid in the sealing chamber 11 out and return it to the sealing chamber 11 after passing through the cooler of the sealing system 7, thereby forming a closed cycle.

[0034] In order to ensure the steady operation of the mechanical sealing system, a sealing system 7 is also required. The sealing system 7 is a prior art and can be understood as an isolation liquid cooling system. When the isolation liquid flows through the sealing system 7, the isolation liquid can be effectively cooled. At the same time, the sealing system 7 also has a pressure control function, which can control the pressure of the isolation liquid circulating between the sealing system 7 and the sealing chamber 11 to meet the mechanical seal requirements, so as to ensure the normal operation of the mechanical sealing structure. A circulation loop is formed between the sealing system 7 and the sealing chamber 11, and isolation liquid flows in the circulation loop. At the same time, the rotational movement of the spiral sleeve 3 provides a driving force for the flow of the isolation liquid to promote the circulation of the isolation liquid, and then the isolation liquid that has been heated in the sealing chamber 11 is cooled through the sealing system 7. The cooled isolation liquid in the sealing chamber 11 can control the sealing working temperature and the pressure of the isolation liquid within the permitted range. The specific design of the above-mentioned circulation loop is as follows:

[0035] A water inlet channel and a water outlet channel are provided in the stationary part 6. The sealing system 7, the water inlet channel, the water outlet channel and the sealing chamber 11 together form a circulation loop. The isolation liquid in the sealing chamber 11 enters the sealing system 7 through the water outlet channel. After the sealing system 7 cools the isolation liquid, it enters the sealing chamber 11 through the water inlet channel to ensure that the sealing environment temperature in the sealing chamber 11 meets the working temperature.

[0036] In order to further ensure that the rotating member 1 can be linked with the spiral sleeve 3 to produce synchronous rotation, the mechanical sealing structure also includes: a transmission sleeve 8, the transmission sleeve 8 is sleeved between the rotating member 1 and the spiral sleeve 3, that is: the inner hole of the transmission sleeve 8 is adapted to the rotating member 1, and the outer ring of the transmission sleeve 8 is adapted to the inner hole of the spiral sleeve 3. At the same time, a positioning hole is provided in the radial direction of the transmission sleeve 8, and the positioning sleeve 12 is installed in the positioning hole. During operation, the transmission sleeve 8 can realize the transmission of torque. Further, in order to achieve the limitation of the dynamic ring 4, a clamping ring 9 is provided on the transmission sleeve 8, and the dynamic ring 4 is limited by the clamping ring 9. Specifically, the above-mentioned clamping ring 9 is provided with two and is respectively installed at the two ends of the outer ring of the transmission sleeve 8, and the two dynamic rings 4 are limited by the two clamping rings 9 to prevent them from falling off.

[0037] Example 2

[0038] The utility model also discloses a mechanical sealing system for a multiphase pump. The mechanical sealing system comprises a multiphase pump. The mechanical sealing structure for a multiphase pump provided in the above-mentioned embodiment 1 is also applied in the mechanical sealing system.

[0039] When the system is in operation, when the spiral sleeve 3 rotates, the thread will drive the isolation liquid in the thread groove to rotate. Due to the oil-driving effect of the spiral groove, the isolation liquid in the sealing chamber 11 is driven to move, so that the isolation liquid moves to one side (the direction of water flow is as shown in the direction of the arrow in the figure above), so that the entire sealing chamber 11 is filled with isolation liquid. With the thread design of the spiral sleeve 3, the isolation liquid can reach the sealing surface 2 of the sealing component more directly. The in-and-out flow cycle can take away the heat generated by the sealing surface 2, thereby reducing the sealing working temperature and achieving the design purpose.

[0040] At the same time, the sealing system 7 cools down the heat-generating isolation liquid pumped by the spiral sleeve 3, and the isolation liquid after the temperature drops is circulated back to the sealing cavity 11. The isolation liquid circulates in the closed pipeline system, so the pressure of the isolation liquid maintains the design requirements to ensure the normal operation of the seal.

[0041] The present utility model is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present utility model fall within the protection scope of the present utility model.

Claims

1. A mechanical seal structure for a multiphase pump, comprising a rotating member (1), a stationary member (6) and a sealing assembly sleeved outside the rotating member (1), wherein the rotating member (1), the stationary member (6) and the sealing assembly together form a sealing chamber (11), characterized in that: Also includes: A spiral sleeve (3) which is sleeved on the outside of the rotating member (1) and is arranged coaxially with the rotating member (1), wherein the spiral sleeve (3) is located inside the sealing chamber (11), and the spiral sleeve (3) and the rotating member (1) rotate synchronously; A sealing system (7), wherein a circulation loop is formed between the sealing system (7) and the sealing chamber (11), and an isolation liquid flows in the circulation loop; The rotational movement of the spiral sleeve (3) provides driving force for the flow of the isolation fluid.

2. The mechanical seal structure for a multiphase pump according to claim 1, characterized in that: A plurality of rectangular threads are arranged on the outer side wall of the spiral sleeve (3).

3. The mechanical seal structure for a multiphase pump according to claim 1, characterized in that: The sealing assembly comprises: A moving ring (4) sleeved on the outside of the rotating member (1), wherein the moving ring (4) is provided with a spring (10) for driving the moving ring to slide; A stationary ring (5) is sealed and assembled with the dynamic ring (4), and the stationary ring (5) is limited by a stationary part (6).

4. The mechanical seal structure for a multiphase pump according to claim 3, characterized in that: A first sealing ring is provided between the dynamic ring (4) and the rotating part (1), and a second sealing ring is provided between the stationary ring (5) and the stationary part (6).

5. The mechanical seal structure for a multiphase pump according to claim 1, characterized in that: At least one positioning sleeve (12) is arranged between the spiral sleeve (3) and the rotating member (1), and a locking screw (13) is arranged inside each positioning sleeve (12).

6. The mechanical seal structure for a multiphase pump according to claim 5, characterized in that: The mechanical The sealing structure further comprises: a transmission shaft sleeve (8), the transmission shaft sleeve (8) being sleeved between the rotating member (1) and the spiral sleeve (3), and a positioning hole being provided in the radial direction of the transmission shaft sleeve (8), and the positioning sleeve (12) being installed in the positioning hole.

7. The mechanical seal structure for a multiphase pump according to claim 6, characterized in that: The transmission shaft sleeve (8) is provided with a clamping ring (9), and the movable ring (4) is limited by the clamping ring (9).

8. The mechanical seal structure for a multiphase pump according to claim 1, characterized in that: A water inlet channel and a water outlet channel are provided in the stationary part (6), and a circulation loop is formed by the sealing system (7), the water inlet channel, the water outlet channel and the sealing chamber (11).

9. A mechanical sealing system for a multiphase pump, the mechanical sealing system comprising a multiphase pump, the mechanical sealing system further comprising a mechanical sealing structure for a multiphase pump as claimed in any one of claims 1 to 8.

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