Mechanical seal with cooling water flushing function and stirring device with mechanical seal

Abstract

The utility model relates to the technical field of food production equipment, in particular to a mechanical seal with a cooling water flushing function and a stirring device with the mechanical seal, and the mechanical seal with the cooling water flushing function comprises a mechanical seal body which is located on an impeller shaft of the stirring device and connected with a supporting assembly after being assembled to the stirring device. The mechanical seal body comprises a lip seal, a lip seal fixing piece and a first sealing ring, and the first sealing ring is arranged between flange plates, not connected with a motor shell, of the supporting assembly; the lip seal fixing part is provided with a shaft hole, a lip seal containing cavity, a fluid inlet and a fluid outlet, the lip seal containing cavity is arranged around the shaft hole, the fluid inlet and the fluid outlet are communicated with the lip seal containing cavity, and the fluid inlet and the fluid outlet are provided with corresponding openings in the outer surface of the lip seal fixing part. Real-time heat dissipation of the mechanical seal arrangement area is achieved through the mechanical seal body when the stirring device works, the possible leakage problem is avoided, the service life of the device is prolonged, and operation safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of food production equipment, in particular to a mechanical seal with cooling water flushing and a stirring device provided with the mechanical seal. Background Art

[0002] Agitator is a common device that uses a motor to drive the impeller to rotate and then disperse the material at high speed. It is mostly used in chemical, construction and food production and processing industries. Figure 9 The figure shows a common agitator structure in the prior art, which includes a motor 1' and an impeller 2', which are connected to each other through an impeller shaft 3'. The impeller 2' is fixed to the impeller shaft 3', and the motor output shaft 101' is connected to the end of the impeller shaft 3'. A support structure 4' is provided at the connection between the motor output shaft 101' and the impeller shaft 3'. Figure 10 A structural diagram of the support structure is shown, which is used to support the motor housing 102' and the impeller shaft 3', but does not move when the motor output shaft 101' and the impeller 2' rotate synchronously. Figure 9 、 Figure 10 In the illustrated structure, the support structure is formed by two layers of flange plates spaced apart and connected. One layer of flange plate 401' is connected to the motor housing 102' (to facilitate the connection between the two, the motor housing 102' is generally also equipped with a flange structure or bolt holes corresponding to the flange plate, such as a fastening structure). The other layer of flange plate 402' is connected to a separate flange plate 500', which secures the agitator to a mounting base, such as a storage tank. Flange plates 401' and 402' are connected by a connecting rod 403' to secure them relative to each other. Between flange plate 500' and the impeller shaft 3' are a shaft sleeve, a sealing ring, and related structures to ensure the sealing ring's (axial) retention. Together with the support structure, a mechanical seal is achieved. The sealing ring includes a dynamic sealing ring and a static sealing ring. The dynamic sealing ring is arranged between the shaft sleeve and the impeller shaft, and the static sealing ring is arranged between the shaft sleeve and the flange plate 500', thereby forming a sealed connection structure when ensuring the rotation of the impeller shaft, preventing external substances such as materials from invading the area where the coupling part is located which is sealed by the mechanical seal (i.e. the interval area between the support structure and the flange. After the structural assembly is completed, this area can be sealed by a cover. The illustrated structure does not show the cover), preventing materials and other external debris from contaminating the coupling position and the electrical circuits in the motor cavity, so as to avoid damage to the sealing structure and the coupling structure, or even damage to the motor and lead to production accidents.

[0003] However, after prolonged operation, traditional agitators generate heat that cannot be dissipated promptly. This can easily cause deformation of structural components due to thermal expansion and contraction, leading to leakage at the structural seals, which in turn reduces sealing performance and allows trace amounts of material or other external debris to enter the couplings. Over time, accumulated debris can easily damage the electrical structure and wear at the structural connections, affecting the dynamic balance of the impeller, ultimately reducing agitation quality and causing numerous safety issues that are detrimental to component life and agitation operations. Utility Model Content

[0004] The purpose of the utility model is to provide a mechanical seal with cooling water flushing and a stirring device provided with the mechanical seal, so as to solve the above technical problems.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] In the first aspect, the utility model provides a mechanical seal with cooling water flushing, comprising a mechanical seal body, which is connected to the support assembly of the stirring device after being assembled to the stirring device, and the mechanical seal body is arranged on the impeller shaft of the stirring device (the structural arrangement here can be regarded as the mechanical seal body being located at one end of the impeller shaft, which end is used to connect the motor output shaft of the stirring device, and the other end of the impeller shaft is connected to the impeller), wherein,

[0007] The mechanical seal body includes a lip seal, a lip seal fixing member, and a first sealing ring. The lip seal is fixed to the impeller shaft by the lip seal fixing member. The first sealing ring is arranged between the lip seal fixing member and a flange plate of the support assembly of the stirring device that is not connected to the motor housing, and realizes a seal between the two when the mechanical seal body is connected to the support assembly.

[0008] The lip seal fixing member has an axial hole, a lip seal placement cavity, a fluid inlet and a fluid outlet, and the axial hole passes through the two opposite surfaces of the lip seal fixing member.

[0009] The lip seal placement cavity is arranged around the shaft hole and communicates with the shaft hole, and has a concave structure, which is sunken into a side surface of the lip seal fixing member;

[0010] The fluid inlet and the fluid outlet are both communicated with the lip seal placement cavity, and the fluid inlet and the fluid outlet are both provided with corresponding openings on the outer surface of the lip seal fixing member.

[0011] The mechanical seal body of the utility model is provided with a lip seal fixing part with a built-in fluid channel, which cooperates with the fluid inlet and outlet thereon to form a circulating cooling pipeline after being connected to the external cooling water supply pipeline. When the impeller shaft and the impeller rotate, the area where the mechanical seal body is located (including the impeller shaft, especially the shaft structure corresponding to the position on the impeller shaft connected to the mechanical seal body) can be quickly and efficiently dissipated, and the temperature of the relevant structure can be controlled in time to avoid the structure being significantly deformed by the influence of cold and heat, resulting in reduced or even damaged sealing performance, thereby ensuring that the stirring structure equipped with the mechanical seal body can continue to operate at high intensity and has high working stability.

[0012] Preferably, the lip seal placement chamber includes a first chamber and a second chamber, both of which are configured as annular chambers and are adjacent to each other along the axial hole (both chambers are located on the outer periphery of the axial hole and are connected to the axial hole), and the diameter of the first chamber is larger than the diameter of the second chamber;

[0013] The first cavity connects the fluid inlet and the fluid outlet so that the coolant can flow.

[0014] The lip seal is provided in the second cavity.

[0015] Preferably, one end surface of the lip seal fixing piece is provided with an annular recessed structure, in which the first sealing ring is embedded.

[0016] Preferably, the end surface of one side of the lip seal fixing member provided with the annular recessed structure is an outward convex structure, which can play an alignment and positioning role, and can also play a limiting role through the step surface of the outward convex structure;

[0017] Correspondingly, a recessed structure is provided on the flange plate connected to the lip seal fixing member to facilitate the embedding of the convex structure therein.

[0018] Preferably, at least two annular recessed structures are provided on the end surface of the lip seal fixing member facing away from the motor, and one of the first sealing rings is embedded in any of the annular recessed structures.

[0019] Preferably, the lip seal fixing member is a disc-shaped lip seal fixing member having two opposite flat disc surfaces, and the axis center lines of the two disc surfaces are the same straight line.

[0020] The shaft hole is located in the center of the disk surface (here, the shaft hole and the shaft center lines of the two disk surfaces are the same straight line).

[0021] The lip seal placement cavity adopts a circular ring structure.

[0022] Preferably, the support assembly includes a first flange plate, a second flange plate, and a third flange plate, wherein the first flange plate and the second flange plate are spaced apart from each other and connected by a connecting rod, the second flange plate and the third flange plate are overlapped and fixedly connected to each other by fasteners, the first flange plate is used to connect to the motor housing, the second flange plate is used to connect to the third flange plate, and the third flange plate is used to connect to the mounting base;

[0023] The mechanical seal body includes a shaft sleeve, a second sealing ring, and a third sealing ring.

[0024] The shaft sleeve is arranged between the third flange plate and the impeller shaft.

[0025] The second sealing ring is arranged between the shaft sleeve and the third flange plate.

[0026] The third sealing ring is arranged between the shaft sleeve and the impeller shaft.

[0027] Preferably, both ends of the shaft sleeve are provided with recessed structures to facilitate the installation of the second sealing ring and the third sealing ring.

[0028] In a second aspect, the present invention provides a stirring device equipped with the aforementioned mechanical seal. The stirring device comprises a motor, an impeller, an impeller shaft, and a support assembly, wherein the impeller shaft is connected to the impeller and the motor at both ends, respectively. The support assembly is disposed between the impeller shaft and the motor housing to connect the two, providing a rotational support structure for the rotation of the impeller shaft. The mechanical seal body is disposed on the impeller shaft and is located between the impeller shaft and the support assembly.

[0029] Specifically, the mechanical seal body is sleeved on the impeller shaft through its lip seal fixing piece and is located between the impeller shaft and the second flange plate of the support assembly.

[0030] The second flange plate has a through hole, in which the mechanical seal body is embedded. The fasteners connect and fasten the second flange plate and the third flange plate of the supporting assembly.

[0031] Preferably, a spring is sleeved on the impeller shaft, and an annular boss is provided on the impeller shaft.

[0032] One end (lower end) of the spring presses against the annular boss, and the other end (upper end) presses against the lower end surface of the sleeve.

[0033] Beneficial effect: Due to the adoption of the above technical solution, the utility model realizes real-time heat dissipation of the mechanical seal setting area when the stirring device is working through the mechanical seal body, avoids the reduction of sealing caused by structural deformation and the subsequent leakage problem, improves the life of the device, and ensures operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural schematic diagram of the mechanical seal body of the utility model;

[0035] Figure 2 This is a structural schematic diagram of the stirring device of the present utility model;

[0036] Figure 3 for Figure 2 A schematic diagram of a local structure;

[0037] Figure 4 This is a structural schematic diagram of the lip seal fixing member of the present invention;

[0038] Figure 5 for Figure 4 A schematic diagram of a structure when viewed from above;

[0039] Figure 6 This is a schematic cross-sectional view of the lip seal fixing member of the present invention;

[0040] Figure 7 for Figure 5 A schematic diagram of a structure viewed from the bottom up;

[0041] Figure 8 for Figure 5 A schematic diagram of a structure viewed from above;

[0042] Figure 9 A schematic structural diagram of a stirring device in the prior art;

[0043] Figure 10 for Figure 9 A schematic diagram of the structure of the support components in the structure. DETAILED DESCRIPTION

[0044] In order to make the technical means, creative features, purpose and efficacy of the present invention easy to understand, the present invention is further described below in conjunction with specific illustrations. It should be noted that the terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a product or device comprising a series of components or units is not necessarily limited to those components or units clearly listed, but may include other components or components that are not clearly listed or that are inherent to these products or devices.

[0045] In the first aspect, the utility model provides a mechanical seal with cooling water flushing, comprising a mechanical seal body, referring to Figure 1 、 Figure 2 After being assembled to the stirring device, the mechanical seal body is connected to the stirring device's support assembly 201 and is disposed on the stirring device's impeller shaft 202. The structural arrangement here can be seen as the mechanical seal body being located at one end of the impeller shaft 202, which is used to connect to the output shaft of the stirring device's motor 203, while the other end of the impeller shaft 202 is connected to the impeller 204.

[0046] like Figure 1 As shown, the mechanical seal body includes a lip seal 101, a lip seal fixing member 102, and a first sealing ring 103. The lip seal 101 is fixed to the impeller shaft 202 by the lip seal fixing member 102. The first sealing ring 103 is arranged between the lip seal fixing member 102 and the flange plate 402 of the support assembly 201 of the stirring device that is not connected to the motor housing, and realizes a seal between the two when the mechanical seal body is connected to the support assembly 201.

[0047] like Figure 6 As shown, the lip seal fixture 102 has an axial hole 10201, a lip seal placement cavity 10202, a fluid inlet 10203, and a fluid outlet 10204. The axial hole 10201 passes through two opposing surfaces of the lip seal fixture 102. The lip seal placement cavity 10202 is arranged around the axial hole 10201 and communicates with the axial hole 10201. The lip seal placement cavity 10202 is a recessed structure that is sunken into one side surface of the lip seal fixture 102.

[0048] The fluid inlet 10203 and the fluid outlet 10204 are both connected to the lip seal placement cavity 10202 , and the fluid inlet 10203 and the fluid outlet 10204 are both provided with corresponding openings on the outer surface of the lip seal fixing member 102 .

[0049] In addition, in order to facilitate the fixing of the lip seal fixing member 102 on the flange plate 500, as shown in FIG. Figures 4 to 8 As shown, a screw hole 10207 with a through hole structure can be provided on the lip seal fixing member 102 , and correspondingly, a corresponding screw hole (blind hole structure) is also provided on the flange plate 500 .

[0050] The mechanical seal with cooling water flushing of the utility model is installed on the stirring device. Figure 2 As shown, it is first inserted into the hole groove of one flange plate 402 of the support assembly 201 of the stirring device constructed by double-layer / multi-layer flange plates, and then locked on the flange plate 500 by fasteners. Figure 3As shown, the fluid inlet 10203 and fluid outlet 10204 are connected to the coolant circulation pipeline through a pipe interface 9001 (the sealing measures during the pipe connection adopt common sealing connection structures in the prior art, such as O-rings and sealants at the pipe joints). The circulation pipeline is generally equipped with a circulation pump and a coolant storage tank (not shown). After the mechanical seal body is assembled, the lip seal placement cavity surrounding the shaft hole is connected to the coolant circulation supply device after the fluid inlet and fluid outlet are connected to form a fluid channel 9002 for circulating coolant. The lip seal 101 is immersed in this fluid channel 9002, ensuring that the stirring device is constantly cooled during operation. This cooling effect also affects the heat dissipation of the impeller shaft 202.

[0051] It should be noted that in the mechanical seal body of the present invention, the axial hole is configured as a large through-hole structure corresponding to the diameter of the impeller shaft. It penetrates the entire lip seal holder's two opposing surfaces, giving the lip seal holder an annular structure. A recessed depression is provided on one side of the annular structure, forming a chamber for accommodating the lip seal (i.e., the lip seal placement chamber). This chamber is also interconnected with a fluid inlet and a fluid outlet. Both the fluid inlet and the fluid outlet can be considered through-hole structures similar to the axial hole, with a smaller aperture size. These holes serve solely to facilitate the introduction and removal of coolant into and from the lip seal placement chamber, allowing the coolant to circulate within the chamber, thereby providing cooling for the lip seal and surrounding structures within the chamber (including the impeller shaft portion within the lip seal placement range). One opening of each of the fluid inlet and fluid outlet is located on the outer surface of the lip seal holder, while the other opening is located on the inner wall of the lip seal placement chamber.

[0052] During the implementation of the present invention, the coolant may be cooling water or other non-corrosive coolants, such as antifreeze suitable for automobile engines.

[0053] The utility model is to reasonably arrange the lip seal placement cavity so that the influence of the cavity opening on the structural strength is reduced. The structure can be arranged as follows: In some embodiments, such as Figure 6 、 Figure 7 、 Figure 8 As shown, the lip seal placement chamber 10202 includes a first chamber 102021 and a second chamber 102022. Both chambers are configured as annular chambers and are adjacent to each other along the direction of the shaft hole 10201 (both chambers are located on the periphery of the shaft hole and are connected to the shaft hole). The diameter of the first chamber 102021 is larger than the diameter of the second chamber 102022.

[0054] The first cavity 102021 connects the fluid inlet 10203 and the fluid outlet 10204 to allow the coolant to circulate.

[0055] A lip seal 101 is provided in the second cavity 102022 .

[0056] After setting according to the above example, Figures 5 to 8 As shown, it is equivalent to opening up a small chamber upwards in the large chamber. The small chamber is equivalent to a special mounting groove for the lip seal to be embedded. When the coolant flows through the first chamber between the fluid inlet and the fluid outlet, it also circulates between the second chambers to ensure heat dissipation of the lip seal and the impeller shaft structure at its connection.

[0057] In some preferred embodiments, Figures 4 to 8 As shown, to ensure structural strength, an annular protrusion 10208 is provided on one side surface of the lip seal fixture 102. The annular protrusion 10208 covers the second cavity 102022, allowing the second cavity to be further opened along the axial hole to deepen the cavity depth so as to accommodate lip seals of different sizes. At the same time, it can also compensate for the loss of wall thickness due to the opening of the second cavity, thereby maintaining the structural strength of the lip seal fixture to a certain extent.

[0058] In order to achieve the sealing effect between the structural assemblies, the present invention can be configured as follows: In some embodiments, such as Figures 6 to 8 As shown,

[0059] An annular recessed structure 10206 is provided on one end surface of the lip seal fixing member 102, into which the first sealing ring 103 is embedded.

[0060] Combine Figure 1 、 Figure 2 It can be seen that the first sealing ring 103 is arranged on one end face of the lip seal fixing part 102, which faces away from the motor 203. When the mechanical seal body is assembled, the first sealing ring 103 is located between the lip seal fixing part 102 and the flange plate 500 to enhance the sealing effect between the two. Among them, the flange plate 500 in this example is equivalent to Figure 10 The structure shown includes a flange plate 500 ′ for fixing the stirring device to a mounting base, such as a storage tank.

[0061] The utility model is easy to install, and can be arranged as follows: In some embodiments, such as Figure 6 、 Figure 8 As shown, the end surface of one side of the lip seal fixing member 102 provided with the annular recessed structure 10206 is a convex structure (convex downward), which can play an alignment and positioning role, and can also play a limiting role through the step surface of the convex structure;

[0062] Correspondingly, a recessed structure is provided on the flange plate 500 connected to the lip seal fixing member 102 to facilitate the embedding of the convex structure therein.

[0063] In order to further enhance the sealing effect of the lip seal fixture after assembly, the present invention may be configured as follows: In some preferred embodiments, at least two annular recessed structures are provided on the end surface of the lip seal fixture on the side facing away from the motor, and a first sealing ring is embedded in each of the annular recessed structures (this structural arrangement is not shown in the drawings of the present invention).

[0064] Specifically, a convex structure may be provided on the surface of the lip seal fixing piece facing away from the motor, and a plurality of annular concave structures may be provided on the convex structure from the inside to the outside, and a corresponding number of first sealing rings may be embedded therein to enhance the sealing effect.

[0065] The present invention sets a lip seal fixing member according to the following structure: In some embodiments, such as Figure 4 、 Figure 5 As shown, the lip seal fixing member adopts a disc-shaped lip seal fixing member with two opposite flat disc surfaces, and the axis center lines of the two disc surfaces are the same straight line.

[0066] The shaft hole 10201 is located in the exact center of the disk surface (here, the shaft hole and the shaft center lines of the two disk surfaces are the same straight line).

[0067] Based on the above example, Figure 6 As shown, the lip seal placement cavity 10202 preferably adopts a circular ring structure (including the first cavity and the second cavity both adopting a circular ring structure, so that the two cavities are arranged around the shaft hole).

[0068] In order to achieve a better sealing effect, the present invention can be configured as follows: In some embodiments, such as Figure 2 As shown, the support assembly 201 includes a first flange plate 401, a second flange plate 402, and a third flange plate 500. The first flange plate 401 and the second flange plate 402 are spaced apart from each other and connected by a connecting rod. The second flange plate 402 and the third flange plate 500 are overlapped and fixedly connected to each other by fasteners. The first flange plate 401 is used to connect to the motor housing, and the second flange plate 402 is used to connect to the third flange plate 500. At the same time, the lip seal fixing member 102 is embedded in the hole of the second flange plate 402, and the third flange plate 500 is used to connect to the mounting base.

[0069] like Figure 2 、 Figure 3 As shown, the mechanical seal body includes a shaft sleeve 104, a second sealing ring 105, and a third sealing ring 106.

[0070] The shaft sleeve 104 is disposed between the third flange plate 500 and the impeller shaft 202.

[0071] The second sealing ring 105 is disposed between the shaft sleeve 104 and the third flange plate 500.

[0072] The third sealing ring 106 is disposed between the shaft sleeve 104 and the impeller shaft 202 .

[0073] In order to facilitate the installation of the second sealing ring and the third sealing ring, the present invention can be arranged as follows: In some embodiments, such as Figure 2 、 Figure 3 As shown, both ends of the shaft sleeve 104 are provided with recessed structures to facilitate the installation of the second sealing ring 105 and the third sealing ring 106.

[0074] Specifically, a second recessed structure is provided on the outer wall above the sleeve 104 near the upper end surface to facilitate the installation of the second sealing ring 105; a third recessed structure is provided on the outer wall below the sleeve 104 near the lower end surface to facilitate the installation of the third sealing ring 106.

[0075] Based on the above examples, in some embodiments, such as Figure 3 As shown, the end faces of the opposite side ports of the sleeve 104 both have step structures, and the two step structures are arranged in opposite directions. A second sealing ring 105 is provided on the step structure on one end face, and a third sealing ring 106 is provided on the step structure on the other end face.

[0076] It should be noted that the step structures on the two end surfaces of the sleeve 104 are set in reverse, which means that the step structure on one end surface (the upper end surface of the sleeve 104 in the illustrated structure) is arranged according to the following structure: the structure where the vertical surface of the step structure is located is close to the outer wall of the impeller shaft 202, that is, the step structure is arranged facing outward.

[0077] The step structure on the other end surface (the lower end surface of the sleeve 104 in the illustrated structure) is arranged as follows: the vertical surface of the step structure is spaced apart from the outer wall of the impeller shaft 202, that is, the step structure is arranged facing the inside / impeller shaft side.

[0078] In a second aspect, the present invention provides a stirring device, such as Figure 2 As shown, the stirring device includes a motor 203, an impeller 204, an impeller shaft 202 and a support assembly 201. The two ends of the impeller shaft 202 are respectively connected to the impeller 204 and the motor 203. The support assembly 201 is arranged between the impeller shaft 202 and the outer casing of the motor 203 to connect the two so that the rotation of the impeller shaft 202 is supported. The stirring device includes a mechanical seal body, which is arranged on the impeller shaft 202 and located between the impeller shaft 202 and the support assembly 201.

[0079] Specifically, the mechanical seal body is sleeved on the impeller shaft 202 through its lip seal fixing member 102 and is located between the impeller shaft 202 and the second flange plate 402 of the support assembly 201 .

[0080] The second flange plate 402 has a through hole, into which the mechanical seal body (via its lip seal fixing member) is embedded. Fasteners connect and fasten the second flange plate 402 and the third flange plate 500 of the support assembly 201 to each other.

[0081] In order to facilitate the installation and relative fixation of the shaft sleeve and prevent the shaft sleeve from being displaced in the axial direction and coming out from between the support assembly and the impeller shaft of the stirring device, the present invention can be arranged in the following structure: In some embodiments, such as Figure 2 As shown, a spring 107 is sleeved on the impeller shaft 202, and an annular boss 108 is also provided on the impeller shaft 202;

[0082] One end (lower end) of the spring 107 presses against the annular boss 108 , and the other end (upper end) presses against the lower end surface of the sleeve 104 .

[0083] In some preferred embodiments, Figure 3 As shown, the shaft sleeve 104 is provided with an annular downwardly convex structure, so that the end of the spring 107 that presses against the shaft sleeve 104 is surrounded by the annular downwardly convex structure.

[0084] The annular downwardly convex structure is provided on the lower end surface of the shaft sleeve 104 .

[0085] After being set up according to the above example, the annular downward convex structure below the sleeve 104 forms an (annular) groove after being spaced between the surface facing the outer wall of the impeller shaft 202 and the outer wall of the impeller shaft 202. The upper end of the spring 107 is embedded in the groove, which also plays a certain limiting role in the installation of the spring 107.

[0086] To sum up, the mechanical seal body of the present invention, by providing a lip seal fixing part with a built-in fluid channel, cooperates with the fluid inlet and outlet thereon, and forms a circulating cooling pipeline after connecting to the external cooling water supply pipeline. When the impeller shaft and the impeller rotate, the area where the mechanical seal body is located (including the impeller shaft, especially the shaft structure corresponding to the position on the impeller shaft connected to the mechanical seal body) can be quickly and efficiently dissipated, and the temperature of the relevant structure can be controlled in time to avoid the structure being significantly deformed by the influence of cold and heat, resulting in reduced sealing or even damage, thereby ensuring that the stirring structure equipped with the mechanical seal body can continue to operate at high intensity and has high working stability. The stirring device of the present invention can operate continuously for a long time through the high-efficiency real-time heat dissipation performance of the mechanical seal body, and has good working stability and service life.

[0087] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A mechanical seal with cooling water flushing, comprising a mechanical seal body, wherein the mechanical seal body is connected to a support assembly of a stirring device after being assembled to the stirring device, and the mechanical seal body is arranged on an impeller shaft of the stirring device, characterized in that: The mechanical seal body includes a lip seal, a lip seal fixing member, and a first sealing ring. The lip seal is fixed to the impeller shaft by the lip seal fixing member. The first sealing ring is arranged between the lip seal fixing member and a flange plate of the support assembly of the stirring device that is not connected to the motor housing. The lip seal fixing member has an axial hole, a lip seal placement cavity, a fluid inlet and a fluid outlet, and the axial hole passes through the two opposite surfaces of the lip seal fixing member. The lip seal placement cavity is arranged around the shaft hole and communicates with the shaft hole, and has a concave structure, which is sunken into a side surface of the lip seal fixing member; The fluid inlet and the fluid outlet are both communicated with the lip seal placement cavity, and the fluid inlet and the fluid outlet are both provided with corresponding openings on the outer surface of the lip seal fixing member.

2. The mechanical seal with cooling water flushing according to claim 1, characterized in that: The lip seal placement chamber includes a first chamber and a second chamber, both of which are configured as annular chambers and are adjacent to each other along the axial hole, and the diameter of the first chamber is larger than the diameter of the second chamber; The first chamber connects the fluid inlet and the fluid outlet, The lip seal is provided in the second cavity.

3. The mechanical seal with cooling water flushing according to claim 1, characterized in that: An annular recessed structure is provided on one end surface of the lip seal fixing member, and the first sealing ring is embedded therein.

4. The mechanical seal with cooling water flushing according to claim 3, characterized in that: The end surface of the lip seal fixing member on one side of which the annular recessed structure is provided is an outward convex structure; Correspondingly, a recessed structure is provided on the flange plate connected to the lip seal fixing member.

5. The mechanical seal with cooling water flushing according to claim 3, characterized in that: At least two annular recessed structures are provided on the end surface of the lip seal fixing member facing away from the motor, and one of the first sealing rings is embedded in any of the annular recessed structures.

6. The mechanical seal with cooling water flushing according to claim 1, characterized in that: The lip seal fixing member adopts a disc-shaped lip seal fixing member with two opposite flat disc surfaces, and the axis center lines of the two disc surfaces are the same straight line. The shaft hole is located in the center of the disk surface, and the lip seal placement cavity adopts a circular ring structure.

7. The mechanical seal with cooling water flushing according to claim 1, characterized in that: The support assembly includes a first flange plate, a second flange plate, and a third flange plate, wherein the first flange plate and the second flange plate are spaced apart from each other and connected by a connecting rod, and the second flange plate and the third flange plate are overlapped and fixedly connected to each other by fasteners; The mechanical seal body includes a shaft sleeve, a second sealing ring, and a third sealing ring. The shaft sleeve is arranged between the third flange plate and the impeller shaft. The second sealing ring is arranged between the shaft sleeve and the third flange plate. The third sealing ring is arranged between the shaft sleeve and the impeller shaft.

8. The mechanical seal with cooling water flushing according to claim 7, characterized in that: Both ends of the shaft sleeve are provided with recessed structures for facilitating the installation of the second sealing ring and the third sealing ring.

9. A stirring device, comprising a motor, an impeller, an impeller shaft and a support assembly, wherein both ends of the impeller shaft are respectively connected to the impeller and the motor, and the support assembly is arranged between the impeller shaft and the housing of the motor, characterized in that: The impeller shaft is provided with a mechanical seal body according to any one of claims 1 to 8, and the mechanical seal body is located between the impeller shaft and the support assembly.

10. The stirring device according to claim 9, characterized in that A spring is sleeved on the impeller shaft, and an annular boss is provided on the impeller shaft. One end of the spring presses against the annular boss, and the other end presses against the lower end surface of the shaft sleeve.

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