Small-flow high-pressure pipeline circulating pump

Abstract

The utility model relates to the technical field of circulating pumps, and discloses a small-flow high-pressure pipeline circulating pump which comprises a driving device, an inner gland, a cavity, an outer gland, an axial pumping ring, a shaft sleeve, a static ring, a movable ring and a pump shaft. One end surface of the cavity close to the driving device is connected with an inner gland. One end face of the cavity away from the driving device is connected with an outer gland. The driving device comprises a driving end and a fixed end. The driving end of the driving device penetrates through the inner gland and is connected with one end of the pump shaft. The pump shaft is sleeved with the shaft sleeve. And the static ring and the moving ring are sleeved outside the shaft sleeve. One end face of the static ring abuts against one end face of the moving ring. And the axial pumping ring is sleeved on the outer side surface of the movable ring. The outer side face of the axial pumping ring abuts against the inner side face of the cavity. The outer side face of the axial pumping ring and the inner side face of the cavity are each provided with a trapezoid spiral groove. And the spiral direction of the trapezoidal spiral groove of the axial pumping ring is opposite to that of the trapezoidal spiral groove of the cavity. The outer side face of the axial pumping ring and the inner side face of the cavity convey fluid through trapezoidal threads.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating pumps, in particular to a small-flow high-pressure pipeline circulating pump. Background Art

[0002] The existing pipeline circulation pump maintains a small flow rate while maintaining high pressure, which requires precise control of the internal structure of the pump. The pump uses centrifugal force generated by the rotation of the impeller to transport the fluid or uses a screw to squeeze and push the fluid to transport the fluid, which will lead to high manufacturing costs and large size of the pump. The existing pipeline pump seal also has problems such as insufficient pressure resistance, low reliability, and large leakage.

[0003] In order to solve the above problems, we propose a small flow high pressure pipeline circulation pump. Utility Model Content

[0004] The utility model aims to provide a small flow rate high pressure pipeline circulation pump to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical solutions: a small flow high-pressure pipeline circulation pump, including a drive device, an inner gland, a cavity, an outer gland, an axial pumping ring, a sleeve, a static ring, a dynamic ring and a pump shaft;

[0006] An end face of the cavity close to the driving device is connected to the inner pressure cover; an end face of the cavity away from the driving device is connected to the outer pressure cover; the driving device includes a driving end and a fixed end; the driving end of the driving device passes through the inner pressure cover and is connected to one end of the pump shaft; the sleeve is sleeved on the pump shaft; the static ring and the dynamic ring are both sleeved on the outside of the sleeve; an end face of the static ring abuts against an end face of the dynamic ring; the axial pumping ring is sleeved on the outer side surface of the dynamic ring; the outer side surface of the axial pumping ring abuts against the inner side surface of the cavity; the outer side surface of the axial pumping ring and the inner side surface of the cavity are both provided with trapezoidal spiral grooves; the rotation direction of the trapezoidal spiral groove of the axial pumping ring is opposite to that of the trapezoidal spiral groove of the cavity.

[0007] Preferably, a spring box is provided between the static ring and the inner pressure cover; one end face of the spring box is connected to the inner pressure cover; a spring is provided in the spring box; one end of the spring is connected to the inside of the spring box; the other end of the spring is connected to a push ring; an end face of the push ring away from the spring is abutted against an end face of the static ring; the spring box is also provided with a static ring limit spring.

[0008] Preferably, a stationary ring seal is provided between the stationary ring and the push ring; a dynamic ring seal is provided between the dynamic ring and the axial pumping ring

[0009] Preferably, the pump shaft is connected to the inner pressure cover via a bearing.

[0010] Preferably, a water seal is provided at the connection between the inner pressure cover and the pump shaft.

[0011] Preferably, a gland sealing ring is provided at the connection between the inner gland and the cavity and at the connection between the outer gland and the cavity.

[0012] Preferably, the dynamic ring is connected to the shaft sleeve via a dynamic ring anti-rotation pin; and the axial pumping ring is connected to the shaft sleeve via a pumping ring anti-rotation pin.

[0013] Preferably, the pump shaft is connected to the shaft sleeve via a transmission key.

[0014] Preferably, the fixed end of the driving device is connected to a base.

[0015] Compared with the prior art, the utility model has the following beneficial effects: in the small flow high pressure pipeline circulation pump, the outer side of the axial pumping ring and the inner side of the cavity adopt trapezoidal threads to convey the fluid. The double-end static multi-spring mechanical seal seals the fluid in the pump. The overall size of the whole machine is short and small, and the space occupied is small, which is particularly suitable for the pipeline connection and on-site installation of the sealing auxiliary system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the pipeline structure of the utility model.

[0018] In the figure: 1-driving device, 2-base, 3-inner pressure cover, 4-water seal, 5-bearing, 6-cavity, 7-outer pressure cover, 8-pressure cover sealing ring, 9-axial pumping ring, 10-shaft sleeve, 11-spring box, 12-push ring, 13-static ring, 14-static ring sealing ring, 15-static ring limiting retaining spring, 16-dynamic ring, 17-dynamic ring sealing ring, 18-spring, 19-dynamic ring anti-rotation pin, 20-transmission key, 21-pump shaft, 22-pumping ring anti-rotation pin. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0020] See also Figure 1 , Figure 2The utility model provides a technical solution: a small flow high-pressure pipeline circulation pump, including a driving device 1, an inner pressure cover 3, a cavity 6, an outer pressure cover 7, an axial pumping ring 9, a sleeve 10, a static ring 13, a dynamic ring 16 and a pump shaft 21.

[0021] The cavity 6 is connected to the inner pressure cover 3 at one end face close to the driving device 1. The cavity 6 is connected to the outer pressure cover 7 at one end face away from the driving device 1. The driving device 1 includes a driving end and a fixed end. The driving end of the driving device 1 passes through the inner pressure cover 3 and is connected to one end of the pump shaft 21. The sleeve 10 is sleeved on the pump shaft 21. The static ring 13 and the dynamic ring 16 are both sleeved on the outside of the sleeve 10. One end face of the static ring 13 abuts against one end face of the dynamic ring 16. The axial pumping ring 9 is sleeved on the outer side of the dynamic ring 16. The outer side face of the axial pumping ring 9 abuts against the inner side face of the cavity 6. The outer side face of the axial pumping ring 9 and the inner side face of the cavity 6 are both provided with a trapezoidal spiral groove. The rotation direction of the trapezoidal spiral groove of the axial pumping ring 9 is opposite to that of the trapezoidal spiral groove of the cavity 6.

[0022] Among them, the driving device 1 adopts a direct-connected motor with a power of 2KW to 3KW. The working principle of the direct-connected motor is to use electromagnetic induction to generate torque to drive the rotor to rotate. The rotor of the direct-connected motor is a permanent magnet. When powered on, the current will pass through the stator coil to generate a magnetic field, causing the rotor to be affected by the torque in the magnetic field and start to rotate. Direct-connected motors have the characteristics of simple structure, short start-up time, low noise, easy control, and high efficiency. At the same time, because their rotors are permanent magnets, their speed will change with changes in voltage.

[0023] Furthermore, a spring box 11 is provided between the static ring 13 and the inner pressure cover 3. One end face of the spring box 11 is connected to the inner pressure cover 3. A spring 18 is provided inside the spring box 11. One end of the spring 18 is connected to the inside of the spring box 11. The other end of the spring 18 is connected to a push ring 12. One end face of the push ring 12 away from the spring 18 abuts against one end face of the static ring 13. The spring box 11 is also provided with a static ring limit spring 15.

[0024] The internal structure of the circulation pump of the utility model does not use the impeller rotation to generate centrifugal force to convey fluid or the screw extrusion to push the fluid conveying method, but uses the axial pumping ring 9. The outer circle of the axial pumping ring 9 is processed with a trapezoidal spiral groove, and the inner diameter of the cavity 6 is processed with a trapezoidal spiral groove, and the rotation direction is opposite to the rotation direction of the trapezoidal spiral groove on the inner diameter of the cavity.

[0025] Furthermore, a stationary ring seal 14 is provided between the stationary ring 13 and the push ring 12. A dynamic ring seal 17 is provided between the dynamic ring 16 and the axial pumping ring 9. The seal of the utility model adopts a stationary double-end mechanical seal, and the seal shape is as follows: Figure 1 shown.

[0026] Furthermore, the pump shaft 21 is connected to the inner pressure cover 3 via a bearing 5 .

[0027] Furthermore, a water seal 4 is provided at the connection between the inner pressure cover 3 and the pump shaft 21 .

[0028] Furthermore, a gland sealing ring 8 is provided at the connection between the inner gland 3 and the cavity 6 and at the connection between the outer gland 7 and the cavity 6 .

[0029] Furthermore, the dynamic ring 16 is connected to the shaft sleeve 10 via a dynamic ring anti-rotation pin 19. The axial pumping ring 9 is connected to the shaft sleeve 10 via a pumping ring anti-rotation pin 22.

[0030] Furthermore, the pump shaft 21 is connected to the shaft sleeve 10 via a transmission key 20 .

[0031] Furthermore, the fixed end of the driving device 1 is connected to a base 2 .

[0032] It should be noted that Figure 2 A is the circulating fluid inlet, B is the circulating fluid outlet, and C is the leakage fluid interface.

[0033] Working principle:

[0034] The small flow high pressure pipeline circulation pump is equipped with a circulating liquid inlet A and a circulating liquid outlet B, which are connected to the pipeline of the sealing auxiliary system. The commonly used interface sizes are G1 / 2, ZG1 / 2, and NPT1 / 2, and other interface sizes can also be selected according to customization.

[0035] When the pump is working, the circulating fluid enters the pump body from the circulating fluid inlet A. Under the action of the transmission key 20 and the pumping ring anti-rotation pin 22, the axial pumping ring 9 rotates synchronously with the pump shaft 21 controlled by the driving end of the driving device 1. The outer diameter trapezoidal thread structure of the axial pumping ring 9 can produce an axial pumping effect when rotating, pushing the circulating fluid to flow axially and pressurizing it to the circulating fluid outlet B. The inner diameter trapezoidal thread of the cavity 6 can produce a bidirectional pumping effect, which can increase the axial flow rate of the pump.

[0036] The double mechanical seal can seal the circulating fluid transported in the pump to ensure that it will not leak to the motor side and the atmosphere side.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A small flow high pressure pipeline circulation pump, characterized in that: It comprises a driving device (1), an inner gland (3), a cavity (6), an outer gland (7), an axial pumping ring (9), a shaft sleeve (10), a stationary ring (13), a dynamic ring (16) and a pump shaft (21); The end surface of the cavity (6) close to the driving device (1) is connected to the inner pressure cover (3); the end surface of the cavity (6) away from the driving device (1) is connected to the outer pressure cover (7); the driving device (1) comprises a driving end and a fixed end; the driving end of the driving device (1) passes through the inner pressure cover (3) and is connected to one end of the pump shaft (21); the shaft sleeve (10) is sleeved on the pump shaft (21); the stationary ring (13) and the dynamic ring (16) are both sleeved It is arranged on the outer side of the shaft sleeve (10); one end face of the static ring (13) abuts against one end face of the dynamic ring (16); the axial pumping ring (9) is sleeved on the outer side face of the dynamic ring (16); the outer side face of the axial pumping ring (9) abuts against the inner side face of the cavity (6); the outer side face of the axial pumping ring (9) and the inner side face of the cavity (6) are both provided with a trapezoidal spiral groove; the rotation direction of the trapezoidal spiral groove of the axial pumping ring (9) is opposite to that of the trapezoidal spiral groove of the cavity (6).

2. A low-flow high-pressure pipeline circulation pump according to claim 1, characterized in that: A spring box (11) is provided between the static ring (13) and the inner pressure cover (3); one end face of the spring box (11) is connected to the inner pressure cover (3); a spring (18) is provided inside the spring box (11); one end of the spring (18) is connected to the inside of the spring box (11); the other end of the spring (18) is connected to a push ring (12); an end face of the push ring (12) away from the spring (18) abuts against an end face of the static ring (13); the spring box (11) is also provided with a static ring limit spring (15).

3. A small flow rate high pressure pipeline circulation pump according to claim 2, characterized in that: A stationary ring sealing ring (14) is provided between the stationary ring (13) and the push ring (12); and a dynamic ring sealing ring (17) is provided between the dynamic ring (16) and the axial pumping ring (9).

4. A low-flow high-pressure pipeline circulation pump according to claim 1, characterized in that: The pump shaft (21) is connected to the inner pressure cover (3) via a bearing (5).

5. A low-flow high-pressure pipeline circulation pump according to claim 1, characterized in that: A water seal (4) is provided at the connection between the inner pressure cover (3) and the pump shaft (21).

6. A low-flow high-pressure pipeline circulation pump according to claim 1, characterized in that: A gland sealing ring (8) is provided at the connection between the inner gland (3) and the cavity (6) and at the connection between the outer gland (7) and the cavity (6).

7. A low-flow high-pressure pipeline circulation pump according to claim 1, characterized in that: The dynamic ring (16) is connected to the shaft sleeve (10) via a dynamic ring anti-rotation pin (19); the axial pumping ring (9) is connected to the shaft sleeve (10) via a pumping ring anti-rotation pin (22).

8. A low-flow high-pressure pipeline circulation pump according to claim 1, characterized in that: The pump shaft (21) is connected to the shaft sleeve (10) via a transmission key (20).

9. A small flow rate high pressure pipeline circulation pump according to claim 1, characterized in that: The fixed end of the driving device (1) is connected to a base (2).

Images