Front cooling jacket structure of mechanical seal for pump
By introducing a pre-cooling jacket structure and a floating throttling unit into the mechanical seal for pumps, the combination of coolant and throttling unit is used to solve the problem of excessive temperature in the sealing chamber, and efficient cooling and sealing effect are achieved. Improvement reduces cost and space usage.
Patent Information
- Application Number
- CN202323501899.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-21
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-12-21
AI Technical Summary
Under the operating conditions where the pump medium temperature is high, the temperature in the mechanical sealing chamber is too high, resulting in seal failure. The prior art lacks a simple and effective cooling device.
Design a mechanically sealed front cooling jacket structure for pumps, by setting a coolant channel between the sleeve and the cavity, and adding a floating throttling unit to the front end of the seal structure, including bushings, pressing plates, springs and pins , the temperature of the sealing chamber is reduced by using the combination of coolant and throttling unit.
It effectively reduces the temperature of the sleeve and cavity, reduces the flow rate of the medium into the seal, improves the reliability of the seal, and achieves efficient cooling in the case of limited space, reducing costs.
Smart Images
Figure CN222208399U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mechanical seals, in particular to a front cooling jacket structure of a mechanical seal for a pump. Background Art
[0002] When the pump medium temperature is high, the high temperature of the medium will be transmitted to the pump mechanical seal cavity. In addition, the end face friction will generate heat during the operation of the mechanical seal, which will make the temperature in the mechanical seal cavity too high. The mechanical seal works in a high temperature environment, which will have an adverse effect on the performance of the mechanical seal and cause the seal to fail. Therefore, the mechanical seal cavity needs to be cooled.
[0003] However, there is currently no cooling device for a sealed structure that is simple in structure and effective in cooling. Utility Model Content
[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a pre-cooling jacket structure for a pump mechanical seal.
[0005] In order to achieve the purpose of the utility model, the present application provides the following technical solutions.
[0006] In the first aspect, the present application provides a pre-cooling jacket structure for a mechanical seal for a pump, the mechanical seal comprising a sleeve, a cavity and a sealing unit arranged between the sleeve and the cavity, the sleeve and the cavity are sleeved on the rotating shaft of the pump, the front end of the sleeve is inserted in the center of the tail end of the pump cavity, and the tail end is fixed by a locking ring, characterized in that the side wall of the cavity is provided with at least one liquid inlet and one liquid outlet, and a cooling liquid channel is provided in the side wall of the cavity, one end of the cooling liquid channel is connected to the liquid inlet or the liquid outlet, and the other end is connected to the gap between the sleeve and the cavity.
[0007] In one embodiment of the first aspect, the floating throttling unit is located at the center of the tail end of the pump chamber, and the floating throttling unit is fixed to the front end of the cavity by screws, the floating throttling unit is sleeved on the outside of the sleeve, and the gap between the floating throttling unit and the outer wall of the sleeve is less than 0.15 mm.
[0008] In one embodiment of the first aspect, the floating throttling unit includes a bushing and a pressure plate, the pressure plate is fixed to the cavity by screws, a bushing cavity is opened on the inner side of the pressure plate, the bushing is installed in the bushing cavity, the bushing is sleeved on the outside of the sleeve, and the gap between the inner wall of the bushing and the outer wall of the sleeve is less than 0.15 mm.
[0009] In one embodiment of the first aspect, the front and rear side walls of the bushing cavity are arranged perpendicular to the axial direction of the rotating shaft, the front outer wall of the bushing abuts against the front inner wall of the bushing cavity, and the front outer wall of the bushing is ground.
[0010] In one implementation of the first aspect, a plurality of springs are fixed to the rear inner wall of the bushing cavity, and each of the springs abuts against the rear outer wall of the bushing.
[0011] In an implementation manner of the first aspect, at least one pin is connected between the bushing and the pressure plate, and the pin is arranged parallel to the axial direction of the rotating shaft.
[0012] In an implementation of the first aspect, a gasket is provided between the pressing plate and the front end contact surface of the cavity.
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] (1) Passing coolant between the sleeve and the cavity can reduce the temperature of the sleeve and the cavity, that is, cool the mechanical seal cavity to ensure the reliability of the mechanical seal;
[0015] (2) A floating throttling unit is set at the front end of the mechanical seal. On the one hand, it can reduce the flow rate of the medium entering the mechanical seal. On the other hand, it can effectively utilize the space of the pump chamber without increasing the axial space of the mechanical seal. Compared with other mechanical seals, it is lighter and more compact, saving costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic cross-sectional view of the cooling jacket structure of this application.
[0017] In the accompanying drawings, 1 is a rotating shaft, 2 is a pump chamber, 3 is a cavity, 4 is a liquid inlet, 5 is a liquid outlet, 6 is a coolant channel, 7 is a locking ring, 8 is a positioning plate, 9 is a sleeve, 10 is a pressure plate, 11 is a bushing, 12 is a screw, 13 is a bushing cavity, 14 is a spring, 15 is a pin, 16 is a gasket, 17 is an O-ring, 18 is a cooling gap, and 19 is a sealing unit. DETAILED DESCRIPTION
[0018] Unless otherwise defined, the technical terms or scientific terms used in this specification and claims shall have the ordinary meanings understood by persons with ordinary skills in the technical field to which the utility model belongs. All the values from the lowest value to the highest value listed in this article refer to all the values obtained by incrementing one unit between the lowest value and the highest value when the difference between the lowest value and the highest value is more than two units.
[0019] The following will describe the specific implementation of the utility model. It should be noted that in the specific description of these implementations, in order to provide a concise description, this specification cannot provide a detailed description of all the features of the actual implementation. Without departing from the spirit and scope of the utility model, those skilled in the art may modify and replace the implementation of the utility model, and the resulting implementation is also within the scope of protection of the utility model.
[0020] The pre-cooling jacket structure of the present application is suitable for working conditions where the medium is high temperature such as hot water, and is mainly used in high-temperature boiler circulating water pumps.
[0021] The utility model aims to provide a pump front cooling jacket mechanical seal structure with good cooling effect, so as to produce the function of enhancing the cooling effect under the condition that the mechanical seal structure space is limited.
[0022] The utility model provides a cooling jacket at the front end of the mechanical seal device to solve the problem in the background technology that the temperature of the medium is too high during installation and use, thereby affecting the sealing effect, thereby reducing the temperature of the medium flowing into the main seal and providing a more stable sealing environment.
[0023] A cooling jacket assembly is provided at the front end of the mechanical seal device. The cooling jacket assembly includes a bushing, a bushing pressure plate, a bushing cavity, a spring and a pin. The throttling bushing reduces the flow of the high-temperature medium of the pump into the mechanical seal, reduces the heat accumulation of the medium flowing into the sealing cavity, and cooperates with the cooling effect of the cooling water to reduce the temperature on the sealing end surface. The bushing is pressed tightly against the bushing cavity by the spring, and the roughness and flatness of the close contact surface are very high. The bushing pressure plate is connected to the cavity by screws, and the bushing is connected to the bushing pressure plate by pins to prevent rotation, which can play a good throttling role. The bushing pressure plate and the cavity are sealed by a gasket to prevent the medium from flowing into the sealing cavity to achieve an efficient sealing effect.
[0024] The cooling jacket is arranged at the front end of the mechanical seal, which effectively utilizes the space of the pump cavity without adding extra axial space to the mechanical seal. Compared with other mechanical seals, it is lighter and more compact, saving costs.
[0025] Example
[0026] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.
[0027] The structure in the figure is a schematic diagram of a cross-sectional structure. In reality, most structures are annular structures. The front and back described in the embodiments are only expanded based on the directions in the figure as examples, and do not represent the directions in actual applications.
[0028] Example 1
[0029] A pre-cooling jacket structure for a pump mechanical seal, the structure of which is as follows Figure 1 As shown, the mechanical seal sleeve is arranged on the rotating shaft 1, and the front end of the mechanical seal is inserted in the center of the pump chamber 2, and the rear end of the mechanical seal is positioned by a positioning sheet 8 and fixed by a locking ring 7. The mechanical seal includes a sleeve 9 and a cavity 3, the sleeve 9 is fixed on the rotating shaft 1, and statically sealed by an O-ring, and a sealing unit 19 is arranged between the cavity 3 and the sleeve 9. The sealing unit 19 used in this embodiment is a prior art, and its purpose is to achieve sealing between the sleeve 9 and the cavity 3. Since it is not a technical point of this application, it will not be described in detail.
[0030] At least one liquid inlet 4 and one liquid outlet 5 are provided on the side wall of the cavity 3, and a cooling liquid channel 6 is provided in the side wall of the cavity 3, one end of the cooling liquid channel 6 is connected to the liquid inlet 4 or the liquid outlet 5, and the other end is connected to the cooling gap 18 between the sleeve 9 and the cavity 3. By passing the cooling liquid, the sleeve 9, the cavity 3 and the sealing unit 19 are cooled to achieve the cooling of the mechanical seal.
[0031] In a conventional mechanical seal, a high-temperature medium can enter the interior of the mechanical seal through the pump chamber 2. In order to reduce the flow rate of the high-temperature medium into the mechanical seal, a floating throttling unit is added to the front end of the mechanical seal in this embodiment, as follows:
[0032] The floating throttling unit includes a pressure plate 10, a bushing 11, a spring 14, a gasket 16, a pin 15, an O-ring 17 and other structures. The pressure plate 10 is fixed to the front end of the cavity 3 by a screw 12, and a gasket 16 is provided between the contact surface between the pressure plate 10 and the front end of the cavity 3, and an O-ring 17 is provided between the pressure plate 10 and the inner wall of the cavity 3. A bushing cavity 13 (annular) with a cubic structure is opened on the inner side of the pressure plate 10, and the bushing 11 is installed in the bushing cavity 13. In actual installation, the bushing 11 is placed in the bushing cavity 13, and then the bushing 11 and the bushing cavity 13 are sleeved on the outside of the shaft sleeve 9, and then the pressure plate 10 is fixed to the front end of the cavity 3 by screws 12. Due to the limitation of manufacturing precision and in order to make it more convenient for the bushing 11 to be installed on the outside of the sleeve 9, the inner diameter of the bushing 11 will be slightly larger than the outer diameter of the sleeve 9, but the gap between the bushing 11 and the outer wall of the sleeve 9 must be less than 0.15 mm, so as to reduce the flow of high-temperature medium entering the mechanical seal from the gap between the bushing 11 and the sleeve 9. The front end side of the bushing 11 is ground and very smooth, which can ensure that the front end of the bushing 11 fits tightly with the front inner wall of the bushing cavity 13 to prevent the high-temperature medium from leaking from here. A spring 14 is provided between the rear end side of the bushing 11 and the rear inner wall of the bushing cavity 13, and the bushing 11 is tightly pressed against the front inner wall of the bushing cavity 13 by the tension of the spring 14. A plurality of springs 14 are provided and evenly distributed on the bushing 11. At the same time, in order to rotate between the bushing 11 and the pressure plate 10, at least one pin 15 is connected between the bushing 11 and the pressure plate 10.
[0033] During operation, high-temperature medium leaks to the mechanical seal. Due to the presence of the floating throttling unit, only a small amount of high-temperature medium can enter the interior of the mechanical seal from the gap between the bushing 11 and the shaft sleeve 9. Compared with the existing mechanical seal, the input of heat source is reduced. At the same time, the temperature of the mechanical seal is further reduced by cooling with cooling water, thereby better reducing the temperature of the medium flowing to the sealing chamber.
[0034] The above description of the embodiments is to facilitate those of ordinary skill in the art to understand and apply the present application. It is obvious that those familiar with the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without having to pay creative labor. Therefore, the present application is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art based on the contents disclosed in the present application without departing from the scope and spirit of the present application are within the scope of the present application.
Claims
1. A pre-cooling jacket structure for a mechanical seal for a pump, the mechanical seal comprising a sleeve, a cavity, and a sealing unit arranged between the sleeve and the cavity, the sleeve and the cavity are sleeved on the rotating shaft of the pump, the front end of the sleeve is inserted in the center of the tail end of the pump cavity, and the tail end is fixed by a locking ring, characterized in that: The side wall of the cavity is provided with at least one liquid inlet and one liquid outlet, and a cooling liquid channel is provided in the side wall of the cavity, one end of the cooling liquid channel is connected to the liquid inlet or the liquid outlet, and the other end is connected to the gap between the shaft sleeve and the cavity.
2. The pre-cooling jacket structure of the pump mechanical seal according to claim 1, characterized in that: A floating throttling unit is provided at the center of the tail end of the pump cavity, and the floating throttling unit is fixed to the front end of the cavity by screws. The floating throttling unit is sleeved on the outside of the shaft sleeve, and the gap between the floating throttling unit and the outer wall of the shaft sleeve is less than 0.15mm.
3. The pre-cooling jacket structure of the pump mechanical seal according to claim 2, characterized in that: The floating throttling unit includes a bushing and a pressure plate, the pressure plate is fixed to the cavity by screws, a bushing cavity is opened on the inner side of the pressure plate, the bushing is installed in the bushing cavity, the bushing is sleeved on the outside of the sleeve, and the gap between the inner wall of the bushing and the outer wall of the sleeve is less than 0.15mm.
4. The pre-cooling jacket structure of the pump mechanical seal according to claim 3, characterized in that: The front and rear side walls of the bushing cavity are arranged perpendicular to the axial direction of the rotating shaft, the front outer wall of the bushing abuts against the front inner wall of the bushing cavity, and the front outer wall of the bushing is ground.
5. The pre-cooling jacket structure of the pump mechanical seal according to claim 4, characterized in that: A plurality of springs are fixed to the rear inner wall of the bushing cavity, and each of the springs abuts against the rear outer wall of the bushing.
6. The pre-cooling jacket structure of the pump mechanical seal according to claim 3, characterized in that: At least one pin is connected between the bushing and the pressure plate, and the pin is arranged parallel to the axial direction of the rotating shaft.
7. The pre-cooling jacket structure of the pump mechanical seal according to claim 3, characterized in that: A gasket is provided between the pressing plate and the front contact surface of the cavity.