CN110486474B - Mechanical sealing device with function component mounting structure - Google Patents

Abstract

The present invention provides a mechanical sealing device with a functional component installation structure. On the basis of the existing mechanical sealing equipment, a deformable retaining member is provided. The retaining member has a natural state and an installation state. The retaining member changes from the natural state to the installation state when affected by external factors, and always has a tendency to change to the natural state when in the installation state. The changing tendency is used to push the functional component so that the functional component is fixed between the retaining member and the static ring. The functional component, such as a sensor, an actuator, etc., is installed on the static ring in the mechanical sealing device, so that the mechanical sealing device can be monitored and regulated, thereby solving the problem that the existing mechanical sealing device cannot install the functional component due to its own material and structural design.

Description

Mechanical sealing device with functional component mounting structure

Technical Field

The invention relates to the field of mechanical sealing equipment, in particular to a mechanical sealing device with a functional component mounting structure.

Background technique

Mechanical seal is a dynamic sealing device for end faces, which needs to reduce or eliminate the friction and wear of the friction pair (formed by the two end faces in relative motion and the fluid medium) to extend its service life while maintaining low leakage or no leakage.

As industrial applications have higher requirements for reliability, the intelligence of mechanical seals has become one of the important technical features of the next generation of mechanical seals. The realization of some high-performance monitoring and control functions requires the installation of components with corresponding functions on the sealing ring, such as sensors for detecting various physical signals on the sealing end face of the sealing ring, or actuators for fine adjustments to the sealing ring. The specific technical problems faced in installing these components include:

(1) Installation structure problems caused by sealing ring materials. Mechanical sealing rings are made of a variety of materials, which are selected based on the physical properties required for their work and cannot be changed at will. Typical materials include metal, graphite, ceramics, etc. Some of these materials are difficult to process in some common structural forms due to their own properties (for example, it is difficult to process threads on graphite materials).

(2) Spatial coordination issues: Mechanical seals have a compact structure, so the functional components installed on the mechanical seal ring and the structures attached to the functional components are allowed to occupy very limited space in the design.

(3) Reliability and assembly and disassembly process issues. Some installation methods in the laboratory stage use some temporary means to install the functional components on the sealing ring. Their reliability is poor, the installation lacks repeatability, and the disassembly process easily damages the functional components or seals, and cannot be transplanted into industrial applications.

Summary of the invention

Based on this, it is necessary to provide a mechanical sealing device with a functional component installation structure to address the problem that it is difficult to install additional components in current mechanical sealing devices.

The above purpose is achieved through the following technical solutions:

A mechanical sealing device with a functional component installation structure comprises: a sealing component, a functional component and a retaining member, wherein the sealing component comprises a stationary ring, the sealing component is sleeved on a rotating shaft, and the functional component is arranged on the stationary ring; the retaining member is arranged between the functional component and the rotating shaft, the retaining member has a natural state and an installed state, the retaining member changes from the natural state to the installed state when affected by external factors, and always has a tendency to change to the natural state when in the installed state, and uses this changing tendency to push the functional component, so that the functional component is fixed between the retaining member and the stationary ring.

In one embodiment, the stationary ring includes a first surface and a second surface, the first surface and the second surface are both located on the inner side of the stationary ring and are perpendicular to each other; the functional component is arranged on the first surface, and the second surface can limit the axial or radial displacement of the retaining member along the stationary ring.

In one of the embodiments, a first groove is provided on the first surface, and the functional component is arranged in the first groove. The first groove can limit the displacement of the functional component along the axial and/or circumferential direction of the stationary ring.

In one of the embodiments, a second groove is provided on the retaining member, and the functional component is arranged in the second groove. The second groove can limit the displacement of the functional component along the axial and/or circumferential direction of the stationary ring.

In one embodiment, the retaining member includes a retaining ring and a packing ring, the stationary ring also includes a third surface, the first, second and third surfaces surround and form a mounting groove, the retaining ring contacts the second surface and forms a radial positioning, the retaining ring is provided with a positioning structure and forms a radial positioning for the functional component; the packing ring contacts the third surface, the packing ring is made of a flexible material, and relies on its own elastic deformation to push the functional component through the retaining ring.

In one of the embodiments, the retaining ring is provided with a wire guide groove or a wire guide hole.

In one of the embodiments, a wire guide groove or a wire guide hole is provided on the stationary ring seat in the sealing assembly.

In one embodiment, the external factor is one or any combination of external force, temperature field, and electric field.

In one embodiment, the retaining member is made of nylon.

In one of the embodiments, a pressure testing element is provided between the retaining member and the functional component.

In one embodiment, the pressure sensing element comprises pressure-sensitive paper.

In one embodiment, the functional component is one or any combination of an acoustic emission sensor, an acceleration sensor, a temperature sensor, a heating/cooling device, an electro-deformation device, a thermal deformation device, and an ultrasonic generating device.

In one embodiment, the number of the functional components is at least two. In one embodiment,

The beneficial effects of the present invention are:

The present invention provides a mechanical sealing device with a functional component installation structure. On the basis of the existing mechanical sealing equipment, a deformable retaining member is provided. The retaining member has a natural state and an installation state. The retaining member changes from the natural state to the installation state when affected by external factors, and always has a tendency to change to the natural state when in the installation state. The changing tendency is used to push the functional component so that the functional component is fixed between the retaining member and the static ring. The functional component, such as a sensor, an actuator, etc., is installed on the static ring in the mechanical sealing device, so that the mechanical sealing device can be monitored and regulated, thereby solving the problem that the existing mechanical sealing device cannot install the functional component due to its own material and structural design.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a mechanical sealing device with a functional component mounting structure provided in Embodiment 1 of the present invention;

FIG2 is a schematic diagram of a partial structure of a mechanical sealing device with a functional component mounting structure provided in Embodiment 1 of the present invention in another direction;

3 is a schematic structural diagram of a retaining ring in a natural state in a mechanical sealing device with a functional component mounting structure provided by Embodiment 1 of the present invention;

4 is a schematic diagram of a partial structure of a stationary ring in a mechanical seal device with a functional component mounting structure provided in Embodiment 1 of the present invention;

5 is a schematic structural diagram of a mechanical sealing device with a functional component mounting structure provided in Embodiment 2 of the present invention;

FIG6 is a schematic structural diagram of a retaining ring in a mechanical sealing device with a functional component mounting structure provided in Embodiment 2 of the present invention.

in:

Stationary ring 100; first surface 110; first groove 111; first protrusion 112; second surface 120; third surface 130; third protrusion 131; retaining member 200; second groove 201; retaining ring 210; lead hole 211; packing ring 220; functional component 300; pressure-sensitive paper 400; stationary ring seat 500; lead groove 510; dynamic ring 600; bushing 700; lead 800.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

In order to meet the needs of modern industrial production, the existing mechanical seal structure needs to add a variety of functional components to the sealing ring of the mechanical seal, such as monitoring components, control components, etc. However, the existing mechanical seal devices have the following difficulties that make it difficult to install the functional components: 1. Some materials in the mechanical seal equipment are difficult to process into common mechanical installation structures, such as graphite, ceramics, etc.; 2. The space available for the installation of functional components in the mechanical seal equipment is limited; 3. The installation methods of some experimental functional components have poor reliability and cannot be used in industrial production.

In order to solve the above problems, the present invention provides a mechanical sealing device with a functional component installation structure, as shown in FIG2 , which includes a sealing component, a functional component 300 and a retaining member 200, wherein the sealing component includes a stationary ring 100, the sealing component is sleeved on the rotating shaft, and the functional component 300 is arranged on the stationary ring 100; the retaining member 200 is arranged between the functional component 300 and the rotating shaft, and the retaining member 200 can be deformed, and after deformation, the functional component 300 is continuously pushed, so that the functional component 300 is fixed between the retaining member 200 and the stationary ring 100. Through this design, the sealing ring in the existing mechanical sealing device is processed to a limited extent, and the inherent gap between the stationary ring 100 and the rotating shaft in the sealing ring is utilized to set the retaining member 200 in the gap, and the functional component 300 is pushed by the deformation of the retaining member 200 itself, so that the functional component 300 and the sealing ring are relatively fixed. The retaining member 200 is used to fix the functional component 300, and the structure is simple, the fixation is reliable, and the occupied space and the modification of the mechanical sealing device are small.

Preferably, as shown in Fig. 1 and Fig. 2, the stationary ring 100 includes a first surface 110 for mounting the functional component 300, and a second surface 120 for positioning the retainer 200; the first surface 110 and the second surface 120 are both arranged on the inner side of the stationary ring 100, that is, the side of the stationary ring 100 close to the rotating shaft; the first surface 110 and the second surface 120 are arranged perpendicular to each other. The end surface of the retainer 200 is in close contact with the second surface 120, and at the same time, the side surface of the retainer 200 perpendicular to the end surface continuously pushes the functional component 300, and the functional component 300 is subjected to the pushing force of the retainer 200 and remains relatively fixed with the stationary ring 100.

Preferably, as shown in Figures 2 and 4, a first groove body 111 is provided on the first surface 110, and the functional component 300 is arranged in the first groove body 111. The first groove body 111 can limit the functional component 300, and the limitation includes limiting the functional component 300 along the axial and/or circumferential direction of the stationary ring 100 by multiple side surfaces of the first groove body 111.

Preferably, as shown in Figures 2 and 3, a second groove body 201 is provided on the retaining member 200, and the functional component 300 is arranged in the second groove body 201. The second groove body 201 can limit the functional component 300, and the limiting includes limiting the functional component 300 along the axial and/or circumferential direction of the stationary ring 100 by multiple side surfaces of the second groove body 201.

Preferably, as shown in FIG5 , the stationary ring 100 includes a third surface 130 in addition to the first surface 110 and the second surface 120. The first surface 110, the second surface 120 and the third surface 130 surround and form a mounting groove, wherein the second surface 120 serves as the bottom surface of the mounting groove, and the first surface 110 and the third surface 130 serve as two side surfaces of the mounting groove. The retaining member 200 is arranged in the mounting groove, and the retaining member 200 includes a retaining ring 210 and a packing ring 220. The retaining ring 210 contacts the second surface 120 (i.e., the bottom surface of the mounting groove) and forms a radial positioning. The retaining ring 210 is provided with a positioning structure to form a radial positioning for the functional component 300. The packing ring 220 contacts the third surface 130 (i.e., one side surface of the mounting groove) and is supported by a flexible material. The packing ring 220 applies a force to the retaining ring 210 by virtue of its own elastic deformation, so that the retaining ring 210 pushes the functional component 300 and makes the functional component 300 close to the first surface 110 (i.e., the other side surface of the mounting groove), thereby realizing the axial positioning of the mounting groove. It should be noted that the radial, axial and circumferential directions mentioned above and below, unless otherwise specified, refer to the radial, axial and circumferential directions of the rotating shaft (these directions are the same for the rotating shaft and the stationary ring 100) in the mechanical sealing device.

Preferably, as shown in Fig. 5, a wire groove or wire hole 211 is provided on the retaining ring 210. For some functional components 300, it is necessary to connect to external devices through wires or other physical cables. To facilitate the arrangement of cables, a wire groove or wire hole 211 is provided on the retaining ring 210 for the cables to pass through.

Preferably, as shown in Fig. 2, a lead groove 510 or a lead hole is provided on the stationary ring seat 500. For some functional components 300, it is necessary to connect to external devices through leads 800 or other physical cables. To facilitate the arrangement of cables, a lead groove 510 or a lead hole is provided on the stationary ring seat 500 for the cables to pass through.

Preferably, as shown in FIG. 3 , the retaining member 200 has a natural state and an installed state. Normally, the retaining member 200 is in the natural state. When affected by external factors, the retaining member 200 is transformed from the natural state to the installed state. Normally, the overall size of the retaining member 200 in the installed state is smaller than the size in the natural state. When the retaining member 200 is in the installed state, it always has a tendency to transform into the natural state. When there is no influence of external factors, the retaining member 200 gradually transforms from the installed state to the natural state.

Preferably, the external factors include one or any combination of external force, temperature field, and electric field. In addition to the above factors, other means that can cause an object to change in shape or physical and chemical properties, such as magnetic field, light, etc., can also be applied to the present invention.

Preferably, the retaining member is made of nylon. Nylon has low rigidity and certain elasticity, and also has high rigidity and heat resistance. Other common elastic materials, such as rubber and some polymer elastic materials, can be applied to the present invention.

Preferably, as shown in FIG2 , a pressure testing element is provided between the retaining member 200 and the functional component 300. Since the retaining member 200 exerts a force on the functional component 300 through its own deformation, it is necessary to control the force to a certain extent, so it is necessary to measure the force. By providing a pressure testing element between the functional component 300 and the retaining member 200, the force exerted by the retaining member 200 on the functional component 300 can be measured, which is convenient for adjusting the retaining member 200 or the functional component 300.

Preferably, as shown in FIG2 , the pressure test element includes a pressure-sensitive paper 400. The color of the pressure-sensitive paper 400 changes when it is subjected to a specific pressure, and the pressure at different positions of the functional component 300 can be determined by the color change. There are two ways to measure the force of the pressure test element. One is real-time monitoring and synchronous output of the results, such as setting a processing sensor or strain gauge on the retaining member 200 and the functional component 300. The advantage of this method is real-time monitoring, but the installation space between the retaining member 200 and the functional component 300 is very limited, and the pressure test element in this method is difficult to install; the other is to observe the results after the test, such as setting a pressure-sensitive paper 400 on the retaining member 200 and the functional component 300, and after the installation is completed, the retaining member 200 is removed and the color change of the pressure-sensitive paper 400 is observed and the pressure is measured. This method is simple to install, but it is impossible to measure the actual pressure condition during installation. The theoretical value can be obtained by multiple experimental installations and measuring multiple pressures.

Preferably, the functional components are one or any combination of acoustic emission sensors, acceleration sensors, temperature sensors, heating/cooling devices, electro-deformation devices, thermal deformation devices, and ultrasonic generating devices. The acoustic emission sensors, acceleration sensors, and temperature sensors are monitoring sensors used to monitor some physical parameters of the sealing ring in the mechanical sealing device; the heating/cooling devices, electro-deformation devices, thermal deformation devices, and ultrasonic generating devices are action elements used to change the physical parameters or physicochemical properties of the sealing ring.

Embodiment 1:

As shown in Figures 1 to 4, Figure 1 is a partial cross-sectional view of the mechanical seal device with a functional component installation structure provided by the present invention when the retainer 200 and the functional component 300 are not installed. In order to facilitate the installation of the functional component 300, the stationary ring 100 includes a section with a larger inner diameter and a section with a smaller inner diameter. The inner side surface of the section with a larger inner diameter is a first surface 110, and the end surface of the section with a smaller inner diameter is a second surface 120. The rest of the mechanical seal equipment is the same as that of a general mechanical seal, such as a dynamic ring 600, a shaft sleeve 700, etc.

The retainer 200 is an annular structure, which is sleeved on the rotating shaft and the sleeve 700, and the inner diameter of the retainer ring 210 is slightly larger than the outer diameter of the sleeve 700, so that a certain gap is maintained between the two without contact. The end face of the retainer 200 contacts the second surface 120 of the stationary ring 100, and forms an axial positioning, so that the retainer 200 has a correct axial position, and at the same time limits the movement of the retainer 200 along the axial direction to the left in the figure. The outer side of the annular retainer 200 pushes the functional component 300 and presses the functional component 300 on the first surface 110, so that the functional component 300 and the stationary ring 100 are fixed. A first groove 111 is provided on the first surface 110 of the stationary ring 100 for positioning the functional component 300; a second groove 201 is provided on the retainer 200, and the second groove 201 is used to install the pressure test element and assist in positioning the functional component 300.

The first slot body 111 can be a half-through slot or a closed slot. Since the slot body is usually processed by milling, the first slot body 111 is composed of a plane section located in the middle of the slot body and a cylindrical section located at both ends of the slot body. For a half-through slot, the functional component 300 is positioned unidirectionally in the axial direction by relying on the side of the plane section of the first slot body 111, and the functional component 300 is positioned radially by relying on the bottom of the first slot body 111. For a closed slot, the functional component 300 is positioned bidirectionally in the axial direction by relying on the two side surfaces of the plane section of the first slot body 111, and the functional component 300 is positioned radially by relying on the bottom of the first slot body 111. It should be noted that the closed slot has certain requirements for the size of the functional component 300. When the size of the functional component 300 in a certain direction is equal to the slot width, axial bidirectional positioning can be achieved. If the size of the functional component 300 is smaller than the slot width, axial unidirectional positioning can only be achieved through one side of the slot body. The length direction of the first groove body 111 is perpendicular to the axial direction of the rotating shaft, and the length direction of the first groove body 111 can also be parallel to the axial direction of the rotating shaft, and the parallel type plays a role in positioning the functional component 300 along the circumferential direction. It should be noted that since the amount of material removed by the cutting process of the first groove body 111 is extremely limited, it is believed that this structural modification will hardly affect the mass distribution of the sealing ring, nor will it affect the balance characteristics of the sealing ring.

The retainer 200 is provided with a second slot 201, which is used to position the functional component 300 during installation. The pressure test element is arranged in the second slot 201. The retainer 200 is made of nylon, which has low rigidity but high strength and heat resistance. Since the temperature of the stationary ring 100 rises when the shaft is running, the retainer 200 has certain heat resistance requirements. Nylon also has certain elasticity, and can naturally recover to the natural state or have a tendency to transform to the natural state after being deformed to the installation state by force.

The shapes of the first slot body 111 and the second slot body 201 should be appropriately adjusted according to the shape of the functional component 300. For example, when the measuring surface of the functional component 300 is a plane, the bottom surface of the first slot body 111 should also be a plane; when the measuring surface of the second gear functional component 300 is a curved surface, the bottom surface of the first slot body 111 should also be a curved surface. The number of the first slot body 111 and the second slot body 201 should also be adjusted according to the number of the functional components 300.

The retainer 200 is not a rotating body in its natural state. It is composed of multiple main structures and connecting structures, and each main structure is a part of a cylindrical rotating body. When the retainer 200 is in the installed state and installed in the mechanical seal device, it cannot return to its natural state due to the squeezing effect of the functional component 300, so that the shape of the retainer 200 is close to a circular ring, which cooperates well with other structures in the mechanical seal device. The elastic deformation of the retainer 200 when it is working is the source of its stable and predictable holding force on the functional component 300.

In this embodiment, a push ring is further provided between the stationary ring seat 500 and the stationary ring 100, and the stationary ring 100 is floatingly mounted on the stationary ring seat 500 through the push ring. The functional component 300 includes three shaped acoustic emission sensors for measuring the acoustic emission signals generated by the end face friction pair. The pressure sensing element is a pressure sensitive paper 400, which can produce corresponding color changes according to the pressure.

When installing the functional component 300, first place the pressure-sensitive paper 400 and the acoustic emission sensor into the second slot 201 on the retaining member 200, apply external force to deform the nylon retaining member 200, and place the retaining member 200 together with the pressure-sensitive paper 400 and the acoustic emission sensor into the inner side of the static ring 100, so that the acoustic emission sensor is located in the first slot 111, and then remove the external force. Heat the entire mechanical seal device to 130°C to simulate the temperature of the mechanical seal device during operation. After running for a period of time, stop and dismantle it, take out the pressure-sensitive paper 400 and record the pressure information recorded by the pressure-sensitive paper 400, and adjust the retaining member 200 according to the pressure information. Repeat the above steps until the pressure size and uniformity meet the requirements and remain stable. After the installation is completed, a piece of unread pressure-sensitive paper 400 is left between the retaining member 200 and the functional component 300, which is used to read the pressure data when the mechanical seal device is subsequently inspected and repaired.

For some retaining members 200 whose shapes are difficult to change by external force, the principle of thermal expansion and contraction can be utilized to install the retaining member 200 into the mechanical sealing device by cooling the retaining member 200 and/or heating the entire mechanical sealing device.

Embodiment 2:

As shown in FIG5 and FIG6, compared with the first embodiment, the second embodiment does not perform material removal processing on the stationary ring 100, that is, the stationary ring 100 does not have the first groove body 111. Accordingly, the stationary ring 100 has a first surface 110, a second surface 120 and a third surface 130 (it should be noted that the surfaces referred to by the first surface 110 and the second surface 120 in the first embodiment and the second embodiment are different), the first surface 110 is perpendicular to the axis of the rotating shaft, the second surface 120 is parallel to the axis of the rotating shaft, and the third surface 130 is parallel to the first surface 110. The first, second and third surfaces 130 surround and form a mounting groove. In order to form the first surface 110 and the third surface 130, the stationary ring 100 has corresponding protruding parts, including a first protrusion 112 located on the first surface 110 and a third protrusion 131 on the third surface 130. The first protrusion 112 is used to expand the mounting surface of the functional component 300 to improve the efficacy of the functional component 300, and the third protrusion 131 is used to assist in positioning the functional component 300.

The retaining member 200 includes a retaining ring 210 and a packing ring 220, wherein the packing ring 220 is made of a material with low rigidity and can be elastically deformed to provide a retaining force. A positioning groove is provided on the retaining ring 210 to radially position the functional component 300. The retaining ring 210 pushes the functional component 300 toward the end face of the functional component 300 and transmits the retaining force of the packing ring 220 to the functional component 300, so that the functional component 300 is closely attached to the first surface 110 and relatively fixed to the stationary ring 100. A lead hole 211 is provided on the retaining ring 210 for passing the signal line of the functional component 300.

The installation method of the second embodiment is as follows: first, the pressure-sensitive paper 400 and the functional component 300 are sequentially placed in the retaining ring 210, and the positioning is performed by the positioning groove on the retaining ring 210, and the pressure-sensitive paper 400 is located between the functional component 300 and the retaining ring 210. Then, the functional component 300, the retaining ring 210 and the packing ring 220 are all installed in the installation groove on the stationary ring 100. After installation, the external force is removed. After installation, as shown in the figure, from left to right, the first protrusion 112, the functional component 300, the pressure-sensitive paper 400, the retaining ring 210, the packing ring 220 and the third protrusion 131 are sequentially arranged. The mechanical seal device is heated to 130°C as a whole to simulate the temperature of the mechanical seal device during operation. After running for a period of time, it is stopped and dismantled, the pressure-sensitive paper 400 is taken out and the pressure information recorded by the pressure-sensitive paper 400 is recorded, and the retaining member 200 is adjusted according to the pressure information. The above steps are repeated until the pressure size and uniformity meet the requirements and remain stable. After installation, an unread pressure-sensitive paper 400 is left between the retaining member 200 and the functional component 300, which is used to read the pressure data when the mechanical sealing device is subsequently inspected.

For some retaining members 200 whose shapes are difficult to change by external force, the principle of thermal expansion and contraction can be utilized to install the retaining member 200 into the mechanical sealing device by cooling the retaining member 200 and/or heating the entire mechanical sealing device.

The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims (12)

1. A mechanical sealing device with a functional component installation structure, characterized in that it comprises: a sealing component, a functional component and a retaining member, the sealing component comprises a static ring, the sealing component is sleeved on a rotating shaft, and the functional component is arranged on the static ring; the retaining member is arranged between the functional component and the rotating shaft, the retaining member comprises a retaining ring, the retaining member is an annular structure, sleeved on the rotating shaft and the shaft sleeve, the inner diameter of the retaining ring is slightly larger than the outer diameter of the shaft sleeve, so that a certain gap is maintained between the two without contact, the retaining member has a natural state and an installed state, the retaining member changes from the natural state to the installed state when affected by external factors, and always has a tendency to transform to the natural state when in the installed state, and uses this transformation tendency to push the functional component so that the functional component is fixed between the retaining member and the static ring. 2. The mechanical sealing device with a functional component mounting structure according to claim 1 is characterized in that the stationary ring includes a first surface and a second surface, the first surface and the second surface are both located on the inner side of the stationary ring and are perpendicular to each other; the functional component is arranged on the first surface, and the second surface can limit the displacement of the retaining member along the axial direction of the stationary ring. 3. The mechanical sealing device with a functional component mounting structure according to claim 2 is characterized in that a first groove body is provided on the first surface, the functional component is arranged in the first groove body, and the first groove body can limit the axial and/or circumferential displacement of the functional component along the stationary ring. 4. The mechanical sealing device with a functional component mounting structure according to claim 2 is characterized in that a second groove body is provided on the retaining member, the functional component is arranged in the second groove body, and the second groove body can limit the axial and/or circumferential displacement of the functional component along the stationary ring. 5. The mechanical sealing device with a functional component mounting structure according to claim 1, characterized in that a wire guide groove or a wire guide hole is provided on the retaining ring. 6. The mechanical sealing device with a functional component mounting structure according to claim 1, characterized in that a wire guide groove or a wire guide hole is provided on the stationary ring seat in the sealing component. 7. The mechanical sealing device with a functional component mounting structure according to claim 1, characterized in that the external factor is one or any combination of external force, temperature field, and electric field. 8. The mechanical sealing device with a functional component mounting structure according to claim 1, wherein the retaining member is made of nylon. 9. The mechanical sealing device with a functional component mounting structure according to claim 1, characterized in that a pressure testing element is provided between the retaining member and the functional component. 10 . The mechanical sealing device with a functional component mounting structure according to claim 9 , wherein the pressure testing element comprises pressure-sensitive paper. 11. The mechanical sealing device with a functional component mounting structure according to claim 1 is characterized in that the functional component is one or any combination of several of an acoustic emission sensor, an acceleration sensor, a temperature sensor, a heating/cooling device, an electro-deformation device, a thermo-deformation device, and an ultrasonic generating device. 12. The mechanical sealing device with a functional component mounting structure according to claim 11, characterized in that the number of the functional components is at least two.