Double-rotor self-priming pump
By introducing a cooling and monitoring structure into the mechanical seal of a twin-screw pump, the wear problem caused by heat accumulation on the sealing surface is solved, achieving effective cooling and early warning, preventing leakage, and extending the service life of the mechanical seal.
Patent Information
- Application Number
- CN202520865233.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-04-30
AI Technical Summary
Existing twin-screw pumps suffer from severe wear on the contact surfaces of the rotating and stationary rings due to heat accumulation in their mechanical seals, leading to leakage. Furthermore, they lack effective cooling and early warning mechanisms.
The mechanical seal device is equipped with a cooling structure and a monitoring structure. The cooling structure removes heat from the stationary ring end face through coolant, while the monitoring structure monitors the wear of the stationary contact surface through electrodes and an accelerometer, providing early warning and quantifying the degree of wear to prevent leakage.
It effectively reduces the temperature of the stationary ring end face, and the monitoring structure can provide timely warnings of wear, prevent leakage, and extend the service life of the mechanical seal.
Smart Images
Figure CN223923282U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to pump technical field especially relates to a double rotor self priming pump. BACKGROUND
[0002] The viscosity range of medium transported by double screw pump is large, from low viscosity light medium liquid to super high viscosity heavy medium liquid can satisfy its delivery requirement. When working, double screw pump inhales delivery medium in suction chamber, and the delivery medium is discharged from discharge chamber after being transmitted by screw. Mechanical seal is usually arranged at both ends of screw to prevent leakage of delivery medium. Because there is relative rotation between contact surface of dynamic ring and static ring of mechanical seal, a large amount of heat is generated on the contact surface of dynamic ring and static ring; if the heat cannot be dissipated in time, the temperature of dynamic ring and static ring will rise sharply, which leads to severe wear of end surface between dynamic ring and static ring, and further leads to failure of sealing surface, causing leakage of double screw pump. Therefore, how to cool and prewarn the wear of end surface becomes a problem to be solved. SUMMARY
[0003] The utility model aims at providing a double rotor self priming pump to solve the problems in prior art, and the technical scheme adopted by the utility model is:
[0004] A double rotor self priming pump, comprising an outer shell, a driving shell, a driving shaft and a driven shaft, a threaded sleeve arranged on part of the outer shell, a mechanical seal device arranged at both ends of the threaded sleeve, the mechanical seal device sleeving the driving shaft and the driven shaft, and a cooling structure and a monitoring structure arranged on the mechanical seal device.
[0005] Further, the driving shell is arranged symmetrically at both ends of the outer shell, the driving shaft and the driven shaft are arranged in the driving shell, the driving cavity is arranged in the driving shell, a pump cover is arranged at the connection between the outer shell and the driving shell, the cooling channel communicating with the outside is arranged in the pump cover, the mechanical seal device comprises a static ring, the static ring is arranged through the pump cover, the cooling cavity is arranged in the static ring, the liquid inlet and the liquid outlet of the cooling cavity are arranged on the static ring, the liquid inlet communicates with the cooling channel, and the liquid outlet communicates with the driving cavity.
[0006] The driving shell is arranged symmetrically at both ends of the outer shell, the driving shaft and the driven shaft are arranged in the driving shell, the driving cavity is arranged in the driving shell, a pump cover is arranged at the connection between the outer shell and the driving shell, the cooling channel communicating with the outside is arranged in the pump cover, the mechanical seal device comprises a static ring, the static ring is arranged through the pump cover, the cooling cavity is arranged in the static ring, the liquid inlet and the liquid outlet of the cooling cavity are arranged on the static ring, the liquid inlet communicates with the cooling channel, and the liquid outlet communicates with the driving cavity.
[0007] Further, the monitoring structure comprises an electrode and an acceleration sensor, a static contact surface is arranged on one side of the static ring in the driving shell, two electrodes are arranged symmetrically in the cooling cavity, the two electrodes are connected with the static contact surface, and the acceleration sensor is detachably arranged on one side of the pump cover in the driving cavity.
[0008] Further, the mechanical seal device further comprises a dynamic ring, a dynamic ring seat, a spring and a spring seat; the spring seat is embedded on the main shaft and the driven shaft, the dynamic ring and the dynamic ring seat are sleeved on the main shaft and the driven shaft, the dynamic ring is clamped to the dynamic ring seat, a plurality of springs are arranged between the dynamic ring seat and the spring seat, and a dynamic contact surface is arranged on one side of the dynamic ring close to the static ring and abuts against the static contact surface.
[0009] Further, one end of the main shaft located in the driving shell is provided with a driving tooth, and one end of the driven shaft located in the driving shell is provided with a driven tooth.
[0010] Further, the threaded sleeve comprises a positive threaded sleeve and a reverse threaded sleeve, the positive threaded sleeve and the reverse threaded sleeve are sequentially arranged on the main shaft, and the reverse threaded sleeve and the positive threaded sleeve are sequentially arranged on the driven shaft.
[0011] The utility model discloses the following beneficial effects: the cooling cavity is arranged on the static ring, and the heat generated by end face friction is taken away by cooling liquid, thereby reducing the end face loss caused by overheating and aggravated friction. Meanwhile, the abrasion condition of the static contact surface is detected by monitoring the resistance value and vibration frequency of the static contact surface, thereby making early warning to the leakage of the pump. Meanwhile, the abrasion degree is quantified by calibrating the resistance-abrasion amount relationship, thereby predicting the service life of the static contact surface, and preventing leakage early. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 It is the sectional view of the utility model;
[0013] Figure 2 It is Figure 1 The enlarged view of A in the figure. DETAILED DESCRIPTION
[0014] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. If not specially pointed out, the technical means used in the embodiments are conventional means familiar to those skilled in the art.
[0015] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.
[0016] As Figures 1-2 shown, a double-rotor self-suction pump includes an outer casing 1, the outer casing 1 and a driving casing 4 are provided with a driving shaft 2 and a driven shaft 11, the portions of the driving shaft 2 and the driven shaft 11 located in the outer casing 1 are provided with threaded sleeves, the threaded sleeves are provided with mechanical seal devices 5 at both ends, the mechanical seal devices 5 are sleeved with the driving shaft 2 and the driven shaft 11, and the mechanical seal devices 5 are provided with cooling structures and monitoring structures. The cooling liquid in the cooling structures can take away the heat generated by the friction of the end surface of the static ring 501, and the monitoring structures can monitor the wear condition of the static contact surface 507, and an alarm is sent according to the wear condition to prevent leakage.
[0017] In addition, the driving casing 4 is also included, the cooling structure includes a driving cavity 3, a cooling channel 402, a liquid outlet 502, a cooling cavity 503 and a liquid inlet 513; in the embodiment, the driving casing 4 is symmetrically arranged at both ends of the outer casing 1 (in another embodiment, the driving casing 4 is arranged at only one end, and the other end of the outer casing 1 is closed, and the end is not provided with the mechanical seal device 5, but only uses a bearing connection), the driving casing 4 is provided with the driving shaft and the driven shaft, the driving casing 4 is provided with the driving cavity 3, the outer casing 1 and the driving casing 4 are provided with a pump cover 401 at the connection position, the driving shaft and the driven shaft penetrate through the pump cover 401, and the pump cover 401 is provided with the cooling channel 402 which is connected to the outside; the mechanical seal device 5 includes a static ring 501, the pump cover 401 is provided with the static ring 501 which penetrates through, the static ring 501 is provided with the cooling cavity 503, the static ring 501 is provided with the liquid inlet 513 and the liquid outlet 502 which are connected to the cooling cavity 503, the liquid inlet 513 is connected to the cooling channel 402, and the liquid outlet 502 is connected to the driving cavity 3. The cooling channel 402 is connected to an external cooling circulation system, the other end of the cooling circulation system is connected to the driving cavity 3, the cooling liquid enters the cooling cavity 503 through the cooling channel 402 to take away the heat generated by the end surface of the static contact surface 507, and then flows into the driving cavity 3 through the liquid outlet 502 to lubricate the driving teeth 201 and the driven teeth 1101 in the driving cavity 3, and the lubricated cooling liquid is again introduced into the cooling circulation system. The cooling liquid uses a non-conductive solution, and can use a synthetic ester cooling liquid or a silicon oil-based cooling liquid.
[0018] As Figure 2As shown, the monitoring structure comprises the electrode 505 and the acceleration sensor 10, the static ring 501 is provided with a static contact surface 507 on one side in the driving shell 4, two electrodes 505 are symmetrically provided in the cooling cavity 503, the two electrodes 505 are connected to the static contact surface 507, the pump cover 401 is detachably provided with the acceleration sensor 10 on one side in the driving cavity 3, and the acceleration sensor 10 and the electrode 505 are electrically connected to the external control unit. The static contact surface 507 adopts a graphite end surface, the acceleration sensor 10 adopts a high-frequency acceleration sensor (such as PCB 352C33, frequency response 0.5-10 kHz), which is used to capture the vibration frequency of the static contact surface 507, the electrode 505 can adopt a silver paste coating or an embedded metal sheet, when the static contact surface 507 is worn, the vibration frequency changes, and when the wear is severe, the vibration spectrum changes, and at the same time, the resistance between the two electrodes 505 changes, by monitoring the changes of the frequency and the resistance, it can be judged whether the static contact surface 507 is worn and whether the internal liquid is leaked. In addition, by calibrating the resistance-wear amount relationship, the wear degree is quantified, so as to predict the service life of the static contact surface 507, thereby preventing leakage in advance, and by setting two monitoring modes, the misjudgment caused by the failure of one monitoring mode can be effectively eliminated. The mechanical seal device 5 further comprises a dynamic ring 509, a dynamic ring seat 510, a spring 511 and a spring seat 512; the spring seat 512 is embedded on the driving shaft and the driven shaft, the dynamic ring 509 and the dynamic ring seat 510 are sleeved on the driving shaft and the driven shaft, the dynamic ring 509 is clamped to the dynamic ring seat 510, a plurality of springs 511 are arranged between the dynamic ring seat 510 and the spring seat 512, the dynamic ring 509 is provided with a dynamic contact surface 506 on the side close to the static ring 501, and the dynamic contact surface 506 abuts against the static contact surface 507. The dynamic contact surface 506 adopts a non-conductive material (such as alumina ceramic). The first sealing ring 504 is arranged between the static ring 501 and the pump cover 401, and the second sealing ring 508 is arranged between the dynamic ring 509 and the dynamic ring seat 510, so as to ensure the sealing performance.
[0019] In addition, one end of the driving shaft 2 in the driving shell 4 is provided with a driving tooth 201, one end of the driven shaft 11 in the driving shell 4 is provided with a driven tooth 1101, and the driving tooth 201 engages with the driven tooth 1101. The threaded sleeve comprises a right threaded sleeve 6 and a reverse threaded sleeve 8, the driving shaft 2 is sequentially provided with the right threaded sleeve 6 and the reverse threaded sleeve 8, the driven shaft 11 is sequentially provided with the reverse threaded sleeve 8 and the right threaded sleeve 6, the left end of the driving shaft 2 is the right threaded sleeve 6, and the right end is the reverse threaded sleeve 8, the left end of the driven shaft 11 is the reverse threaded sleeve 8, and the right end is the right threaded sleeve 6, the right threaded sleeve 6 on the driving shaft 2 engages with the reverse threaded sleeve 8 on the driven shaft 11, and the reverse threaded sleeve 8 on the driving shaft 2 engages with the right threaded sleeve 6 on the driven shaft 11, the two ends of the reverse threaded sleeve 8 and the right threaded sleeve 6 are provided with limiting sleeves in threaded connection to limit the movement of the two, and the two are embedded on the driving shaft and the driven shaft.
[0020] The above-described embodiments are merely preferred modes of the present application, and are not intended to limit the scope of the present application, and various modifications, variations, modifications, and replacements of the technical solutions of the present application made by those skilled in the art without departing from the design spirit of the present application shall fall within the protection scope determined by the claims of the present application.
Claims
1. A dual rotor self-priming pump characterized by: The application relates to a mechanical seal device for a pump, which comprises an outer shell (1) provided with a driving shaft (2) and a driven shaft (11), the driving shaft (2) and the driven shaft (11) are provided with threaded sleeves on the parts in the outer shell (1), the threaded sleeves are provided with mechanical seal devices (5) at both ends, the mechanical seal devices (5) are sleeved with the driving shaft (2) and the driven shaft (11), and the mechanical seal devices (5) are provided with cooling structures and monitoring structures.
2. A double rotor self-priming pump according to claim 1, characterized in that: The application further comprises a driving shell (4), the cooling structure comprises a driving cavity (3), a cooling channel (402), a liquid outlet (502), a cooling cavity (503) and a liquid inlet (513); The driving shell (4) is symmetrically arranged at both ends of the outer shell (1), the driving shell (4) is provided with the driving shaft and the driven shaft, the driving cavity (3) is arranged in the driving shell (4), a pump cover (401) is arranged at the connecting position of the outer shell (1) and the driving shell (4), the pump cover (401) is provided with the cooling channel (402) communicated with the outside, the mechanical seal device (5) comprises a static ring (501), the pump cover (401) is provided with the static ring (501) at the penetrating position, the static ring (501) is provided with the cooling cavity (503), the static ring (501) is provided with the liquid inlet (513) and the liquid outlet (502) communicated with the cooling cavity (503), the liquid inlet (513) is communicated with the cooling channel (402), and the liquid outlet (502) is communicated with the driving cavity (3).
3. A double rotor self-priming pump according to claim 2, characterized in that: The monitoring structure comprises an electrode (505) and an acceleration sensor (10), one side of the static ring (501) in the driving shell (4) is provided with a static contact surface (507), two electrodes (505) are symmetrically arranged in the cooling cavity (503), the two electrodes (505) are connected with the static contact surface (507), and the acceleration sensor (10) is detachably arranged at one side of the pump cover (401) in the driving cavity (3).
4. A self-priming pump according to claim 3, wherein: The mechanical seal device (5) further comprises a dynamic ring (509), a dynamic ring seat (510), a spring (511) and a spring seat (512), the spring seat (512) is embedded on the driving shaft and the driven shaft, the dynamic ring (509) and the dynamic ring seat (510) are sleeved on the driving shaft and the driven shaft, the dynamic ring (509) is clamped with the dynamic ring seat (510), a plurality of springs (511) are arranged between the dynamic ring seat (510) and the spring seat (512), one side of the dynamic ring (509) close to the static ring (501) is provided with a dynamic contact surface (506), and the dynamic contact surface (506) abuts against the static contact surface (507).
5. A double rotor self-priming pump according to claim 3, characterized in that: One end of the driving shaft (2) in the driving shell (4) is provided with a driving tooth (201), one end of the driven shaft (11) in the driving shell (4) is provided with a driven tooth (1101), and the driving tooth (201) is engaged with the driven tooth (1101).
6. A double rotor self-priming pump according to claim 1, characterized in that: The threaded sleeve comprises a right threaded sleeve (6) and a left threaded sleeve (8), the driving shaft (2) is sequentially provided with the right threaded sleeve (6) and the left threaded sleeve (8), and the driven shaft (11) is sequentially provided with the left threaded sleeve (8) and the right threaded sleeve (6).