Double-end-face mechanical sealing structure applied to positive displacement pump

Abstract

The utility model discloses a double-end-face mechanical sealing structure applied to a positive displacement pump, which comprises a positive displacement pump, and the positive displacement pump comprises a pump body, a pump cover and a driver. A pump cavity is formed in the pump body, and a rotor is arranged in the pump cavity; the pump cover is connected to the end face of the pump cavity and seals an opening of the pump cavity. The driver is connected with a rotating shaft, and the end of the rotating shaft extends into the pump cavity to be connected with the rotor. One side of the pump body away from the pump cover is connected with a seal seat; a cooling cavity is formed among the side wall of the pump body, the rotor, the rotating shaft and the mechanical seal seat, a liquid inlet and a liquid outlet are formed in the mechanical seal seat, and the liquid inlet and the liquid outlet are communicated with the cooling cavity; a first sealing structure is arranged between the pump body and the rotor, and a second sealing structure is arranged between the mechanical seal seat and the rotating shaft. According to the double-end-face mechanical sealing structure, the sealing effect can be effectively improved, the phenomenon of oil leakage is avoided, and the cooling effect can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of positive displacement pumps, and more precisely, to a double-ended mechanical seal structure applied to positive displacement pumps. Background Art

[0002] A positive displacement pump is a pump that uses the change in the volume within the pump cylinder to transport liquids. Its working principle is that through the reciprocating or rotary motion of working parts such as pistons, plungers, diaphragms, gears, or vanes within the pump body, the volume of several working chambers within the pump body changes periodically, thereby alternately sucking in and discharging liquids. The main characteristics of positive displacement pumps include low rotational speed, high efficiency, strong self-priming ability, stable operation, and the ability of some pumps to be preheated, and they are widely used for the transportation of highly viscous media.

[0003] An oil circuit is provided within the positive displacement pump, and during operation, cooling water or cooling oil is introduced to cool the positive displacement pump to prevent damage to the seals due to excessive temperature during operation. However, in existing positive displacement pumps, although the sealing effect of the oil circuit is good, oil leakage is likely to occur, which affects the working environment and the cooling effect. Summary of the Utility Model

[0004] The technical problem to be solved by the present utility model is to provide a double-ended mechanical seal structure applied to positive displacement pumps, which can effectively improve the sealing effect, avoid oil leakage, and enhance the cooling effect.

[0005] The technical solution of the present utility model is to provide a double-ended mechanical seal structure applied to positive displacement pumps with the following structure, including a positive displacement pump, where the positive displacement pump includes a pump body, a pump cover, and a driver; a pump chamber is provided within the pump body, and a rotor is provided within the pump chamber; the pump cover is connected to the end face of the pump chamber and seals the opening of the pump chamber; the driver is connected with a rotating shaft, and the end of the rotating shaft extends into the pump chamber and is connected to the rotor; a mechanical seal seat is connected to the side of the pump body away from the pump cover; a cooling chamber is provided between the side wall of the pump body and the rotor, the rotating shaft, and the mechanical seal seat, and an inlet and an outlet are provided on the mechanical seal seat, and both the inlet and the outlet are in communication with the cooling chamber; a first sealing structure is provided between the pump body and the rotor, and a second sealing structure is provided between the mechanical seal seat and the rotating shaft.

[0006] After adopting the above structure, the double-ended mechanical seal structure applied to positive displacement pumps of the present utility model has the following advantages compared with the prior art:

[0007] Due to the double-ended mechanical seal structure of the present utility model applied to a positive displacement pump, a cooling chamber is provided between the side wall of the pump body and the rotor, the rotating shaft and the mechanical seal seat, which can effectively reduce the temperature of the rotor and the rotating shaft, and has a good cooling effect. A first sealing structure is provided between the pump body and the rotor, and a second sealing structure is provided between the mechanical seal seat and the rotating shaft, so that the sealing effect between the pump body, the rotor and the mechanical seal seat is good, and the phenomenon of oil leakage is avoided.

[0008] As an improvement, the first sealing structure includes a first moving ring and a first static ring. The first moving ring is fixedly connected to the rotor, the first static ring is fixedly connected to the side wall of the pump body, and the first moving ring is movably connected to the first static ring and seals each other. After adopting this structure, the structure is simple, and the cooling chamber can be sealed without affecting the rotation of the rotor.

[0009] As an improvement, a concave ring is provided on the side wall of the rotor, and the first moving ring is accommodated in the concave ring; a part of the cooling chamber is formed between the side wall of the concave ring and the inner wall of the pump body. After adopting this structure, the volume of the cooling chamber can be enlarged.

[0010] As an improvement, the second sealing structure includes a second moving ring and a second static ring. The second moving ring is fixedly connected to the rotating shaft, the second static ring is fixedly connected to the mechanical seal seat, and the second moving ring is movably connected to the second static ring and seals each other. After adopting this structure, the cooling chamber can be sealed without affecting the rotation of the rotating shaft.

[0011] As an improvement, a limiting step is provided on the side wall of the rotating shaft, and the second moving ring is fixedly installed on the step surface of the limiting step; another part of the cooling chamber is formed between the side wall of the rotating shaft and the inner wall of the mechanical seal seat. After adopting this structure, the structure is simple and the installation is reliable.

[0012] As an improvement, a limiting convex ring is provided in the middle of the side wall of the pump cover close to the pump body, a receiving groove matching the limiting convex ring is provided on the end surface of the rotor, and the limiting convex ring is embedded in the receiving groove. After adopting this structure, the limiting convex ring has a limiting and supporting effect on the rotor.

[0013] As an improvement, a limiting nut is connected to the end surface of the rotating shaft, and the limiting nut is accommodated in the limiting convex ring; the limiting nut limits the rotor. After adopting this structure, the structure is simple and compact. Description of the Drawings

[0014] Figure 1 It is a cross-sectional view schematic diagram of the double-ended mechanical seal structure of the present utility model applied to a positive displacement pump.

[0015] As shown in the figure: 1. Pump body, 101. Pump chamber, 2. Pump cover, 201. Limit convex ring, 3. Mechanical seal seat, 301. Liquid inlet, 302. Liquid outlet, 4. Rotor, 401. Accommodating cavity, 402. Concave ring, 5. Rotating shaft, 501. Limit nut, 502. Limit step, 6. Cooling cavity, 7. First dynamic ring, 8. First static ring, 9. Second dynamic ring, 10. Second static ring. Specific embodiments

[0016] To better understand the present application, more detailed descriptions of various aspects of the present application will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0017] In the drawings, for the sake of clarity, the thickness, dimensions, and shapes of the objects have been slightly exaggerated. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0018] It should also be understood that the terms "comprising", "including", "having", "containing", when used in this specification, denote the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or combinations thereof.

[0019] As Figure 1 shown, the present application discloses a double - end face mechanical seal structure applied to a positive - displacement pump, including a positive - displacement pump, and the positive - displacement pump includes a pump body 1, a pump cover 2, and a driver.

[0020] A pump chamber 101 is provided in the pump body 1, and openings are provided at both ends of the pump chamber 101. The pump cover 2 is connected to the end face of one end of the pump body 1 and seals the opening at one end of the pump chamber 101. A mechanical seal seat 3 is connected to the end face of the other end of the pump body 1, and the mechanical seal seat 3 is hermetically connected to the pump body 1. A rotor 4 is rotatably installed in the pump chamber 101, the driver is connected to a rotating shaft 5, and the end of the rotating shaft 5 passes through the mechanical seal seat 3 and extends into the pump chamber 101, and the end of the rotating shaft 5 is fixedly connected to the rotor 4.

[0021] A limiting convex ring 201 is provided in the middle of the side wall of the pump cover 2 close to the pump body 1. A receiving groove 201 matching the limiting convex ring 201 is provided on the end face of the rotor 4, and the limiting convex ring 201 is embedded in the receiving groove 201. A limiting nut 501 is connected to the end face of the rotating shaft 5, and the limiting nut 501 is received in the limiting convex ring 201; the limiting nut 501 limits the rotor 4.

[0022] A cooling chamber 6 is provided between the inner wall of the pump body 1, the inner wall of the mechanical seal seat 3, the rotor 4 and the rotating shaft 5. The mechanical seal seat 3 is provided with a liquid inlet 301 and a liquid outlet 302, and both the liquid inlet 301 and the liquid outlet 302 are communicated with the cooling chamber 6.

[0023] A first sealing structure is provided between the pump body and the rotor. The first sealing structure includes a first dynamic ring 7 and a first static ring 8. The first dynamic ring 7 and the first static ring 8 are provided in the cooling chamber 6. The first dynamic ring 7 is fixedly connected to the rotor 4, the first static ring 8 is fixedly connected to the side wall of the pump body 1, and the first dynamic ring 7 is movably connected to the first static ring 8. A concave ring 402 is provided on the side wall of the rotor 4, and the first dynamic ring 7 is received in the concave ring 402; a part of the cooling chamber 6 is formed between the side wall of the concave ring 402 and the inner wall of the pump body 1.

[0024] A second sealing structure is provided between the pump body and the rotor. The second sealing structure includes a second dynamic ring 9 and a second static ring 10. The second dynamic ring 9 and the second static ring 10 are provided in the cooling chamber 6. The second dynamic ring 9 is fixedly connected to the rotating shaft 5, the second static ring 10 is fixedly connected to the mechanical seal seat 3, and the second dynamic ring 9 is movably connected to the second static ring 10. A limiting step 502 is provided on the side wall of the rotating shaft 5, and the second dynamic ring 9 is fixedly installed on the step surface of the limiting step 502; another part of the cooling chamber 6 is formed between the side wall of the rotating shaft 5 and the inner wall of the mechanical seal seat 3.

[0025] When the positive displacement pump is in use, a coolant is introduced from the liquid inlet 301. The coolant enters the cooling chamber 6, exchanges heat with the rotor 4 and the rotating shaft 5 and is heated, and the heated coolant is discharged from the liquid outlet 302, so as to achieve the cooling effect.

[0026] The present invention is not limited to the above-mentioned optimal implementation manner. Anyone can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as it has a technical solution identical or similar to the present application, it falls within the protection scope of the present invention.

Claims

1. A double-ended mechanical seal structure applied to a positive displacement pump, comprising a positive displacement pump, the positive displacement pump including a pump body, a pump cover and a driver; a pump chamber is provided in the pump body, and a rotor is provided in the pump chamber; the pump cover is connected to the end surface of the pump chamber and the pump cover seals the opening of the pump chamber; the driver is connected with a rotating shaft, and the end of the rotating shaft extends into the pump chamber and is connected with the rotor; it is characterized in that: One side of the pump body away from the pump cover is connected with a mechanical seal seat; a cooling chamber is arranged between the side wall of the pump body, the rotor, the rotating shaft and the mechanical seal seat, a liquid inlet and a liquid outlet are arranged on the mechanical seal seat, and both the liquid inlet and the liquid outlet are communicated with the cooling chamber; a first sealing structure is arranged between the pump body and the rotor, and a second sealing structure is arranged between the mechanical seal seat and the rotating shaft.

2. The double-ended mechanical seal structure applied to a positive displacement pump according to claim 1, characterized in that: The first sealing structure includes a first dynamic ring and a first static ring. The first dynamic ring is fixedly connected to the rotor, the first static ring is fixedly connected to the side wall of the pump body, and the first dynamic ring is movably connected with the first static ring and sealed with each other.

3. The double-ended mechanical seal structure applied to a positive displacement pump according to claim 2, characterized in that: A concave ring is arranged on the side wall of the rotor, and the first dynamic ring is accommodated in the concave ring; a part of the cooling chamber is formed between the side wall of the concave ring and the inner wall of the pump body.

4. The double-ended mechanical seal structure applied to a positive displacement pump according to claim 1, characterized in that: The second sealing structure includes a second dynamic ring and a second static ring. The second dynamic ring is fixedly connected to the rotating shaft, the second static ring is fixedly connected to the mechanical seal seat, and the second dynamic ring is movably connected with the second static ring and sealed with each other.

5. The double-ended mechanical seal structure applied to a positive displacement pump according to claim 4, characterized in that: A limiting step is arranged on the side wall of the rotating shaft, and the second dynamic ring is fixedly installed on the step surface of the limiting step; another part of the cooling chamber is formed between the side wall of the rotating shaft and the inner wall of the mechanical seal seat.

6. The double-ended mechanical seal structure applied to a positive displacement pump according to claim 4, characterized in that: A limiting convex ring is arranged in the middle of the side wall of the pump cover close to the pump body, a receiving groove matching with the limiting convex ring is arranged on the end surface of the rotor, and the limiting convex ring is embedded in the receiving groove.

7. The double-ended mechanical seal structure applied to a positive displacement pump according to claim 6, characterized in that: A limiting nut is connected to the end surface of the rotating shaft, and the limiting nut is accommodated in the limiting convex ring; the limiting nut limits the rotor.

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