Mechanical seal device for water wall circulating pump

Abstract

The application relates to a mechanical sealing device for a water-cooled wall circulating pump, belonging to the technical field of mechanical sealing, which comprises a shaft sleeve, a gland, a non-compensation ring, a compensation ring assembly, an elastic element and a conical cleaning ring. The shaft sleeve is used for sleeving on a rotating shaft. The gland is used for connecting with a pump body. The gland is provided with a flushing liquid inlet and a flushing liquid outlet. The non-compensation ring is arranged on the gland. The compensation ring assembly is slidably sleeved on the shaft sleeve along the axial direction of the rotating shaft. The compensation ring assembly is used for abutting against the non-compensation ring to form a friction pair. A sealed mounting cavity is formed between the compensation ring assembly and the shaft sleeve. The elastic element is arranged in the mounting cavity. The conical cleaning ring is arranged on the compensation ring assembly. The conical cleaning ring is used for inhibiting impurity particles from accumulating at the end of the compensation ring assembly. The application has the effect of reducing the operation cost of the device while ensuring the long-period stable operation of the mechanical sealing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical seal, in particular to a mechanical seal device for water-cooled wall circulating pump. BACKGROUND

[0002] The mechanical seal is a shaft sealing device for rotating equipment such as pump body, which generally adopts a sliding structure with multiple springs, including a non-compensation ring, a compensation ring, an elastic element, an auxiliary sealing ring and the like. The elastic element provides axial thrust for the compensation ring to ensure that the compensation ring is in close contact with the non-compensation ring to form a friction pair.

[0003] The water-cooled wall pump generally refers to a water pump for providing circulating power for the water-cooled wall system. In the mechanical seal of the water-cooled wall circulating pump, flushing liquid is usually introduced from the outside to flush the seal in order to cool and lubricate the seal end face. At present, in order to avoid the accumulation of impurity particles in the elastic element and cause the seal to fail, clean flushing liquid treated from the outside is introduced to flush the seal, which greatly increases the operating cost of the device. SUMMARY

[0004] In order to ensure the long-period stable operation of the mechanical seal while reducing the operating cost of the device, the present application provides a mechanical seal device for water-cooled wall circulating pump.

[0005] The mechanical seal device for water-cooled wall circulating pump provided by the present application adopts the following technical scheme:

[0006] A mechanical seal device for water-cooled wall circulating pump, comprising:

[0007] a shaft sleeve for sleeving on a rotating shaft;

[0008] a gland for connecting with a pump body, the gland being provided with a flushing liquid inlet and a flushing liquid outlet;

[0009] a non-compensation ring arranged on the gland,

[0010] a compensation ring assembly for sleeving on the shaft sleeve along the axial direction of the rotating shaft, the compensation ring assembly being arranged in abutment with the non-compensation ring to form a friction pair;

[0011] an elastic element for enabling the compensation ring assembly to always have a tendency to move towards the non-compensation ring, a sealed installation cavity being formed between the compensation ring assembly and the shaft sleeve, the elastic element being arranged in the installation cavity;

[0012] a conical cleaning ring arranged on the compensation ring assembly, the conical cleaning ring being used for inhibiting the accumulation of impurity particles at the end of the compensation ring assembly.

[0013] Preferably, the compensation ring assembly comprises a compensation ring seat and a compensation ring body, the compensation ring seat is sleeved on the shaft sleeve along the axial direction of the rotating shaft, the mounting cavity is formed between the compensation ring seat and the shaft sleeve, the elastic element is arranged between the compensation ring seat and the shaft sleeve, the conical cleaning ring is arranged on the compensation ring seat, and the compensation ring body is mounted on the compensation ring seat and tightly abuts against the non-compensation ring to form a mechanical seal.

[0014] Preferably, the inner wall of the conical cleaning ring has an inner taper surface, and the diameter of the inner taper surface increases in a direction away from the non-compensation ring.

[0015] Preferably, a plurality of power grooves are formed on the conical cleaning ring along the circumferential direction of the conical cleaning ring, and the power grooves penetrate the conical cleaning ring along the radial direction of the rotating shaft.

[0016] Preferably, the shaft sleeve comprises a first sleeve body and a second sleeve body, the outer diameter of the first sleeve body is smaller than the outer diameter of the second sleeve body, the compensation ring seat comprises a connecting section and sealing sections arranged on both sides of the connecting section, the connecting section is sleeved on the first sleeve body, the sealing section on one side of the connecting section is sleeved on the second sleeve body, and the sealing section on the other side is sleeved on the compensation ring body, the mounting cavity is formed between the first sleeve body, the second sleeve body, the connecting section and the sealing section away from the compensation ring body, and the conical cleaning ring is arranged on the sealing section away from the compensation ring body.

[0017] Preferably, a compensation ring seat sealing ring is mounted on the inner wall of the sealing section away from the compensation ring body.

[0018] Preferably, an installation groove is formed in the inner wall of the sealing section away from the compensation ring body, the compensation ring seat sealing ring is located in the installation groove, there is a foreign matter removal gap between the inner wall of the sealing section away from the compensation ring body and the outer wall of the second shaft sleeve, and the foreign matter removal gap is in communication with the installation groove.

[0019] Preferably, the mechanical seal device further comprises a pumping ring, the pumping ring is sleeved on the shaft sleeve, the pumping ring is located on the side of the conical cleaning ring away from the non-compensation ring, a plurality of pumping grooves are formed on the pumping ring along the circumferential direction of the pumping ring, a collecting groove is formed in the inner wall of the gland along the circumferential direction, the pumping grooves are in communication with the collecting groove, and the flushing liquid outlet is in communication with the collecting groove.

[0020] Preferably, the pumping ring comprises a first ring body and a second ring body, the first ring body is sleeved on the shaft sleeve, a plurality of throttling grooves are formed on the outer wall of the first ring body along the self circumferential direction, the outer wall of the first ring body abuts against the gland, the second ring body is arranged on the side of the first ring body close to the conical cleaning ring, a liquid supplement gap is formed between the inner wall of the second ring body and the outer wall of the shaft sleeve, a plurality of pumping grooves are formed on the second ring body, the pumping grooves are communicated with the liquid supplement gap, the second ring body is divided into a plurality of blocks by the pumping grooves, the opposite sides of the blocks are formed with curved surfaces, and the distance between the curved surfaces of the opposite sides of the blocks decreases in the direction away from the axis of the rotating shaft.

[0021] Preferably, the collecting groove is provided with a stopper, the stopper is located on the side of the flushing liquid outlet, the side of the stopper close to the flushing liquid outlet is provided with a flow guide slope, the flow guide slope is aligned with the flushing liquid outlet, and the distance of the flow guide slope to the axis of the rotating shaft increases in the direction close to the stopper.

[0022] In summary, the present application has the following beneficial technical effects:

[0023] The external flushing liquid cools and lubricates the mechanical seal formed by the non-compensation ring and the compensation ring assembly through the flushing liquid inlet, and then is discharged from the flushing liquid outlet. Since the installation cavity is in a sealed state, the elastic element is not in contact with the flushing liquid, thereby being able to adapt to the working condition containing certain particle impurities, and meanwhile, the long-period stable use of the elastic element is not affected. During the rotation of the rotating shaft, the shaft sleeve drives the compensation ring assembly and the conical cleaning ring to rotate synchronously, the conical cleaning ring can inhibit the accumulation of impurity particles at the end of the compensation ring assembly, and further avoid the influence of the impurity particles in the flushing liquid on the normal use of the compensation ring assembly, so that it is not necessary to introduce external clean flushing liquid treated, which is helpful to reduce the operation cost of the device while ensuring the long-period stable operation of the mechanical seal. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the overall structure plan view of the embodiment of the present application.

[0025] Figure 2 It is the local structure plan view of the embodiment of the present application.

[0026] Figure 3 It is the overall structure plan view of the shaft sleeve in the embodiment of the present application.

[0027] Figure 4 It is the overall structure sectional view of the compensation ring seat in the embodiment of the present application.

[0028] Figure 5 It is the local structure plan view of the conical cleaning ring in the embodiment of the present application, wherein the arrow represents the flow field direction of the fluid.

[0029] Figure 6is the overall structure plan view of the pumping ring in the embodiment of the present application.

[0030] Figure 7 is the overall structure schematic view of the pumping ring in the embodiment of the present application.

[0031] Figure 8 is the overall structure sectional plan view of the gland in the embodiment of the present application.

[0032] Mark explanation: 1, shaft sleeve; 101, first sleeve body; 102, second sleeve body; 2, rotating shaft; 3, gland; 4, non-compensation ring; 5, elastic element; 6, mounting cavity; 7, conical cleaning ring; 71, inner taper surface; 8, compensation ring seat; 81, connecting section; 82, sealing section; 9, compensation ring body; 10, power groove; 11, compensation ring seat sealing ring; 12, mounting groove; 13, impurity discharge gap; 14, pumping ring; 141, first ring body; 142, second ring body; 1421, block; 15, pumping groove; 16, collecting groove; 17, throttling groove; 18, liquid supplementing gap; 19, stop block; 20, flow guide slope; 21, flushing liquid inlet; 22, flushing liquid outlet; 23, pump cover; 24, sealing cavity; 25, positioning plate; 26, positioning groove; 27, compensation ring sealing ring; 28, non-compensation ring sealing ring; 29, cylindrical pin; 30, groove body. DETAILED DESCRIPTION

[0033] The following will be combined Figures 1-8 to make a further detailed description of the present application.

[0034] The embodiment of the present application discloses a mechanical sealing device for a water-cooled wall circulating pump. Referring to Figure 1 and Figure 2 , the mechanical sealing device for the water-cooled wall circulating pump comprises a shaft sleeve 1, a gland 3, a non-compensation ring 4, a compensation ring assembly, an elastic element 5 and a conical cleaning ring 7, wherein the shaft sleeve 1 is fixedly sleeved on the rotating shaft 2 through a shaft holder, so as to rotate synchronously with the rotating shaft 2; the gland 3 is fixedly connected with the pump body through bolts, specifically, the gland 3 is fixedly installed on the pump cover 23 through the cooperation of the stud and the nut, so that the gland 3 is in a static state when the rotating shaft 2 rotates; the gland 3 is made of austenitic stainless steel, has excellent corrosion resistance and good mechanical properties; the gland 3 is provided with a flushing liquid inlet 21 and a flushing liquid outlet 22, external flushing liquid enters from the flushing liquid inlet 21 and is discharged through the flushing liquid outlet 22 and the pump cover 23.

[0035] Referring to Figure 1 and Figure 2The non-compensation ring 4 is fixed on the gland 3 by screws, is made of silicon carbide and can resist the wear of particles; the shaft sleeve 1 is rotatably arranged in the non-compensation ring 4, and the non-compensation ring 4 and the gland 3 are provided with a non-compensation ring sealing ring 28 for improving the sealing between the non-compensation ring 4 and the gland 3. The compensation ring assembly is sleeved on the shaft sleeve 1 in the axial direction of the rotating shaft 2, and is used for abutting against the non-compensation ring 4 to form a friction pair. The gland 3, the compensation ring assembly, the non-compensation ring 4 and the shaft sleeve 1 form a sealed cavity 24, and the flushing liquid inlet 21 is aligned with the sealing end surface of the compensation ring assembly and the non-compensation ring 4. The flushing liquid entering from the flushing liquid inlet 21 flows out from the flushing liquid outlet 22 through the sealed cavity 24.

[0036] With reference to Figure 1 and Figure 2 , the elastic element 5 is arranged between the shaft sleeve 1 and the compensation ring assembly, and is used for making the compensation ring assembly always have a tendency of moving towards the non-compensation ring 4. The compensation ring assembly and the shaft sleeve 1 form a sealed mounting cavity 6, and the elastic element 5 is located in the mounting cavity 6. The conical cleaning ring 7 is arranged on the compensation ring assembly, and is used for inhibiting the accumulation of impurity particles at the end of the compensation ring assembly.

[0037] In use, the external flushing liquid enters the sealed cavity 24 through the flushing liquid inlet 21, then cools and lubricates the mechanical seal formed by the non-compensation ring 4 and the compensation ring assembly, and then is discharged from the flushing liquid outlet 22. Since the mounting cavity 6 is in a sealed state, the elastic element 5 is not in contact with the flushing liquid during the operation of the sealing device, thereby being able to adapt to the working condition containing certain particle impurities and not affecting the long-period stable use of the elastic element 5. During the rotation of the rotating shaft 2, the shaft sleeve 1 drives the compensation ring assembly and the conical cleaning ring 7 to rotate synchronously, and the conical cleaning ring 7 can inhibit the accumulation of mechanical impurities at the end of the compensation ring assembly, avoid the impurity particles in the flushing liquid from entering the mounting cavity 6 and affecting the normal use of the compensation ring assembly, thereby being able to maintain the long-period stable operation of the mechanical seal without introducing the externally treated clean flushing liquid, helping to reduce the operation cost of the device and being able to operate stably for a long period under the high-temperature and high-pressure water working condition. In the embodiment, the device can adapt to the working condition with a maximum design temperature of 280℃ and a maximum pressure of 9MPa.

[0038] With reference to Figure 1 and Figure 3 , wherein the shaft sleeve 1 comprises a first sleeve body 101 and a second sleeve body 102, the second sleeve body 102 is fixedly installed on the rotating shaft 2 by a shaft holder, the first sleeve body 101 and the second sleeve body 102 are integrally formed, the first sleeve body 101 and the second sleeve body 102 are arranged in sequence in the direction from the atmosphere side to the medium side, the outer diameter of the first sleeve body 101 is smaller than that of the second sleeve body 102, and this helps to facilitate the installation of the compensation ring assembly.

[0039] With reference to Figure 1 And Figure 3 Further, the compensation ring assembly is sleeved on the first sleeve body 101 and the second sleeve body 102, the first sleeve body 101 is rotatably arranged in the non-compensation ring 4, and the end of the gland 3 close to the atmosphere side is fixed with a positioning plate 25 through bolts. The first sleeve body 101 is provided with a positioning groove 26 which is rotatably matched with the positioning plate 25, which helps to prevent the shaft sleeve 1 from moving axially on the rotating shaft 2.

[0040] With reference to Figure 1 , Figure 2 And Figure 3 Specifically, the compensation ring assembly comprises a compensation ring seat 8 and a compensation ring body 9. The compensation ring seat 8 is made of austenitic stainless steel material, and is sleeved on the first sleeve body 101 and the second sleeve body 102 along the axial direction of the rotating shaft 2. The installation cavity 6 is formed between the compensation ring seat 8, the first sleeve body 101 and the second sleeve body 102. The elastic element 5 is arranged between the compensation ring seat 8 and the second sleeve body 102. The tapered cleaning ring 7 is arranged at the end of the compensation ring seat 8 away from the non-compensation ring 4. The compensation ring body 9 is fixedly installed on the compensation ring seat 8 by bolts. The side of the compensation ring body 9 away from the compensation ring seat 8 is in close abutment with the non-compensation ring 4 to form a friction pair. Specifically, the compensation ring body 9 is made of silicon carbide ceramic with good hardness and wear resistance, which can withstand particle wear, and the compensation ring body 9 is filled with graphite powder, which can increase its self-lubricity.

[0041] With reference to Figure 2 In order to facilitate the formation of the installation cavity 6, the compensation ring seat 8 comprises a connecting section 81 and a sealing section 82. The connecting section 81 is sleeved on the first sleeve body 101. The sealing section 82 is integrally formed on both sides of the connecting section 81. The sealing section 82 on one side of the connecting section 81 is sleeved on the second sleeve body 102, and the sealing section 82 on the other side is sleeved on the compensation ring body 9. The first sleeve body 101, the second sleeve body 102, the connecting section 81 and the sealing section 82 away from the compensation ring body 9 form the installation cavity 6. The compensation ring body 9 is fixedly connected with the connecting section 81 by bolts. The compensation ring sealing ring 27 is installed between the sealing section 82 close to the compensation ring body 9 and the compensation ring body 9. The tapered cleaning ring 7 is arranged on the sealing section 82 away from the compensation ring body 9.

[0042] With reference to Figure 2 In order to facilitate the sliding of the compensation ring seat 8, a plurality of cylindrical pins 29 are fixed on the end face of the second sleeve body 102 close to the first sleeve body 101. The length direction of the cylindrical pins 29 is parallel to the axial direction of the rotating shaft 2. The connecting section 81 of the compensation ring seat 8 is sleeved on the plurality of cylindrical pins 29.

[0043] With reference to Figure 1 , Figure 2 And Figure 3In order to make the compensation ring assembly always have a tendency to move close to the non-compensation ring 4, a plurality of grooves 30 are formed on the end face of the second sleeve body 102 close to the first sleeve body 101 along the circumferential direction of the second sleeve body 102. The elastic element 5 includes a spring, and the spring corresponds to the groove 30 one by one. One end of the spring is fixed to the bottom wall of the groove 30, and the other end is fixed to the connecting section 81 of the compensation ring seat 8. The spring is always in a compressed state, so that the compensation ring body 9 is tightly attached to the non-compensation ring 4 under the joint action of the spring and the medium thrust.

[0044] Referring to Figure 2 and Figure 4 In order to improve the sealing effect of the installation cavity 6, an annular installation groove 12 is formed on the inner wall of the sealing section 82 away from the compensation ring body 9. The compensation ring seat sealing ring 11 is installed in the installation groove 12, and the compensation ring seat sealing ring 11 abuts against the outer wall of the second sleeve body 102, so as to isolate the elastic element 5 from the flushing liquid.

[0045] Referring to Figure 2 and Figure 4 In order to facilitate the suppression of the accumulation of impurity particles at the end of the compensation ring seat 8, the inner wall of the conical cleaning ring 7 has an inner conical surface 71, and the diameter of the inner conical surface 71 increases in the direction away from the compensation ring body 9. The inner flow type and the rotary type structure are adopted. The inner flow type structure refers to a mechanical seal in which the leakage direction of the flushing liquid between the sealing end faces is opposite to the direction of the centrifugal force. The rotary type structure refers to a mechanical seal in which the compensation ring body 9 rotates with the shaft. During sealing operation, the conical cleaning ring 7 rotates with the rotation of the rotating shaft 2. Under the action of the centrifugal force, the fluid at the inner conical surface 71 generates a flow field indicated by the arrow in the middle of the figure. The fluid flows along the inclined direction of the inner conical surface 71 towards the direction away from the end of the compensation ring seat 8, thereby facilitating the suppression of the accumulation of impurity particles at the end of the compensation ring seat 8, achieving self-cleaning effect, and preventing the impurity particles in the flushing liquid from affecting the long-term use of the compensation ring body 9 and the elastic element 5. The device can be applied to flushing liquid containing certain particle impurities, thereby reducing the operation cost of the device. Figure 5 Referring to

[0046] and Figure 2 A plurality of power grooves 10 are formed on the side of the conical cleaning ring 7 away from the compensation ring body 9 along the circumferential direction. The power grooves 10 penetrate the conical cleaning ring 7 along the radial direction of the rotating shaft 2. During the rotation of the conical cleaning ring 7, the formation of the plurality of power grooves 10 helps to accelerate the flow rate of the flow field, thereby effectively suppressing the accumulation of particle impurities at the end of the compensation ring seat 8 and prolonging the service life of the seal. Figure 4 Referring to

[0047] and Figure 2 The plurality of power grooves 10 are formed on the side of the conical cleaning ring 7 away from the compensation ring body 9 along the circumferential direction. The power grooves 10 penetrate the conical cleaning ring 7 along the radial direction of the rotating shaft 2. During the rotation of the conical cleaning ring 7, the formation of the plurality of power grooves 10 helps to accelerate the flow rate of the flow field, thereby effectively suppressing the accumulation of particle impurities at the end of the compensation ring seat 8 and prolonging the service life of the seal. Figure 5The impurity removal gap 13 is located between the inner wall of the sealing section 82 on the side of the compensation ring seat sealing ring 11 away from the compensation ring body 9 and the outer wall of the second shaft sleeve 1, and is in communication with the installation groove 12. When impurity particles enter the installation groove 12, the design of the impurity removal gap 13 helps to take out the impurity particles with the flow field, reduces the influence of the impurity particles on the compensation ring seat sealing ring 11, effectively guarantees the sealing effect of the installation cavity 6, and makes the impurity particles in the flushing liquid less likely to affect the elastic element 5.

[0048] With reference to Figure 2 and Figure 6 , in order to quickly discharge the flushing liquid and improve the cooling and lubricating effect, the mechanical seal device further comprises a pumping ring 14, which is sleeved on the second sleeve body 102 through a screw, specifically, the pumping ring 14 is located on the side of the conical cleaning ring 7 away from the compensation ring body 9, a plurality of pumping grooves 15 are formed on the pumping ring 14 along the circumferential direction of the pumping ring 14, a collecting groove 16 is formed on the inner wall of the gland 3 along the circumferential direction, the pumping grooves 15 are in communication with the collecting groove 16, and the flushing liquid outlet 22 is in communication with the collecting groove 16.

[0049] With reference to Figure 2 and Figure 6 , specifically, the pumping ring 14 comprises a first ring body 141 and a second ring body 142, the first ring body 141 is sleeved on the second sleeve body 102 through a bolt, a plurality of throttling grooves 17 are formed on the outer wall of the first ring body 141 along the circumferential direction of the first ring body 141, and the outer wall of the first ring body 141 abuts against the gland 3; the design of the throttling grooves 17 helps to isolate the medium in the pumping cavity from the flushing liquid, and reduces the exchange between the high-temperature fluid in the pumping cavity and the sealing flushing liquid.

[0050] With reference to Figure 2 , Figure 6 and Figure 7 , the second ring body 142 is integrally formed on the first ring body 141, the second ring body 142 is located on the side of the first ring body 141 close to the compensation ring body 9, the inner diameter of the second ring body 142 is greater than that of the first ring body 141, the second ring body 142 has a liquid supplement gap 18 between the inner wall of the second ring body 142 and the outer wall of the second sleeve body 102, a plurality of pumping grooves 15 are formed on the second ring body 142, the plurality of pumping grooves 15 penetrate the second ring body 142 along the radial direction of the rotating shaft 2, so that the second ring body 142 is divided into a plurality of block bodies 1421, the pumping grooves 15 are in communication with the liquid supplement gap 18, specifically, the liquid supplement gap 18 is located on the inner side of the pumping grooves 15, and the collecting groove 16 is located on the outer side of the pumping grooves 15; the block bodies 1421 have curved surfaces formed on opposite sides of the block bodies 1421 in the circumferential direction of the first ring body 141, and the distance between the curved surfaces on the opposite sides of the block bodies 1421 decreases in the direction away from the axis of the rotating shaft 2.

[0051] During the operation of the mechanical seal, the flushing liquid enters the pumping ring 14 from the liquid supplement gap 18, and then under the high-speed rotation of the pumping ring 14, the flushing liquid is cut and guided by the curved surface of the plurality of blocks 1421 under the centrifugal force to flow along the collection groove 16 outside the pumping ring 14 to the flushing liquid outlet 22, thereby achieving higher pumping efficiency and greater pumping flow; then the flushing liquid is sent to the outside cooler through the flushing liquid outlet 22 for cooling and then returned to the flushing liquid inlet 21, maintaining a relatively low temperature environment at the mechanical seal.

[0052] With reference to Figure 6 and Figure 8 , the collection groove 16 is fixed with a stop block 19, which is located on the side of the flushing liquid outlet 22. Specifically, when the pumping ring 14 rotates, it rotates towards the stop block 19 from the flushing liquid outlet 22, Figure 6 The arrow in the second set of blocks 102 indicates the direction of rotation of the pumping ring 14, and the arrow between the blocks 1421 indicates the flow direction of the flushing liquid from the liquid supplement gap 18 to the collection groove 16.

[0053] With reference to Figure 6 and Figure 8 , the side of the stop block 19 close to the flushing liquid outlet 22 has a flow guide slope 20, which is aligned with the flushing liquid outlet 22, and the distance from the flow guide slope 20 to the axis of the rotating shaft 2 increases towards the center of the stop block 19.

[0054] During the high-speed rotation of the pumping ring 14, the flow guide slope 20 on the stop block 19 can effectively guide the flushing liquid to the flushing liquid outlet 22, reduce the flow loss, and under the same pressure head condition, obtain greater flushing flow, effectively reduce the temperature of the sealing cavity 24, and the pressure head refers to the pressure drop of the fluid during the flow due to friction, resistance, local obstacles or height changes.

[0055] The implementation principle of the embodiment of the present application is as follows: in use, the rotating shaft 2, the shaft sleeve 1, the compensation ring seat 8, the compensation ring body 9, the conical cleaning ring 7 and the pumping ring 14 rotate synchronously, the external flushing liquid enters the sealing cavity 24 through the flushing liquid inlet 21, then the flushing liquid cools and lubricates the mechanical seal formed by the non-compensation ring 4 and the compensation ring body 9, during high-speed rotation of the conical cleaning ring 7, the fluid at the inner conical surface 71 generates a flow field in the rotating state along the inclined direction of the inner conical surface 71 away from the end of the compensation ring seat 8, which can inhibit the accumulation of impurity particles in the flushing liquid at the end of the compensation ring seat 8, and reduce the influence on the compensation ring seat 8, the compensation ring seat sealing ring 11 and the elastic element 5, then the flushing liquid enters the pumping ring 14 through the liquid supplement gap 18, under the high-speed rotation of the pumping ring 14, the flushing liquid flows to the flushing liquid outlet 22 along the collection groove 16 outside the pumping ring 14 through the cutting and guiding of the centrifugal action on the curved surfaces of the plurality of blocks 1421, and the flow guide slope 20 on the stop block 19 can effectively guide the flushing liquid to flow to the flushing liquid outlet 22, thereby reducing the flow loss, then the flushing liquid is sent to the external cooler through the flushing liquid outlet 22 and the pump cover 23 for cooling and then returned to the flushing liquid inlet 21, which helps to maintain a relatively low temperature environment of the mechanical seal.

[0056] In the present application, since the elastic element 5 is always not in contact with the flushing liquid, the conical cleaning ring 7 has a self-cleaning effect, which can adapt to the high-temperature and high-pressure water working condition containing certain particle impurities, without introducing external treated clean flushing liquid, and the impurity particles in the flushing liquid do not affect the long-period stable use of the mechanical seal device, which helps to reduce the device operation cost.

[0057] The above are preferred embodiments of the present application, but do not limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A mechanical seal device for a water wall circulating pump, characterized by, The utility model relates to a mechanical seal device for a pump, comprising: a shaft sleeve (1) for sleeving on a rotating shaft (2); a gland (3) for connecting with a pump body, the gland (3) being provided with a flushing liquid inlet (21) and a flushing liquid outlet (22); a non-compensation ring (4) arranged on the gland (3); a compensation ring assembly for sleeving on the shaft sleeve (1) along the axial direction of the rotating shaft (2), the compensation ring assembly being arranged in abutment with the non-compensation ring (4) to form a friction pair; an elastic element (5) for enabling the compensation ring assembly to always have a tendency to move towards the non-compensation ring (4), the compensation ring assembly and the shaft sleeve (1) being arranged to form a sealed mounting cavity (6), and the elastic element (5) being arranged in the mounting cavity (6); a conical cleaning ring (7) arranged on the compensation ring assembly, the conical cleaning ring (7) being arranged to inhibit the accumulation of impurity particles at the end of the compensation ring assembly; the compensation ring assembly comprises a compensation ring seat (8) and a compensation ring body (9), the conical cleaning ring (7) being arranged on the compensation ring seat (8), the inner wall of the conical cleaning ring (7) being provided with an inner taper surface (71) with a diameter increasing away from the non-compensation ring (4); a plurality of power grooves (10) are arranged on the conical cleaning ring (7) along the circumferential direction of the conical cleaning ring (7), the power grooves (10) penetrating the conical cleaning ring (7) along the radial direction of the rotating shaft (2); the compensation ring seat (8) comprises a connecting section (81) and sealing sections (82) arranged on both sides of the connecting section (81), and a compensation ring seat sealing ring (11) is arranged on the inner wall of the sealing section (82) away from the compensation ring body (9); an installation groove (12) is arranged on the inner wall of the sealing section (82) away from the compensation ring body (9), the compensation ring seat sealing ring (11) being arranged in the installation groove (12), and a gap (13) for removing impurities being arranged between the inner wall of the sealing section (82) away from the compensation ring body (9) and the outer wall of the second shaft sleeve (1), the gap (13) being in communication with the installation groove (12); the mechanical seal device further comprises a pumping ring (14) sleeved on the shaft sleeve (1), the pumping ring (14) being arranged on the side of the conical cleaning ring (7) away from the non-compensation ring (4), a plurality of pumping grooves (15) being arranged on the pumping ring (14) along the circumferential direction of the pumping ring (14), a collecting groove (16) being arranged on the inner wall of the gland (3) along the circumferential direction, the pumping grooves (15) being in communication with the collecting groove (16), and the flushing liquid outlet (22) being in communication with the collecting groove (16). The pumping ring (14) comprises a first ring body (141) and a second ring body (142), a plurality of pumping grooves (15) are formed on the second ring body (142), and the second ring body (142) is divided into a plurality of block bodies (1421) by the plurality of pumping grooves (15). Curved surfaces are formed on opposite sides of the block bodies (1421), and the distance between the curved surfaces on the opposite sides of the block bodies (1421) decreases away from the axis of the rotating shaft (2).

2. A mechanical seal device for a water wall circulating pump according to claim 1, characterized in that: The compensation ring seat (8) is sleeved on the shaft sleeve (1) in the axial direction of the rotating shaft (2), the mounting cavity (6) is formed between the compensation ring seat (8) and the shaft sleeve (1), the elastic element (5) is arranged between the compensation ring seat (8) and the shaft sleeve (1), and the compensation ring body (9) is mounted on the compensation ring seat (8). The compensation ring body (9) is in close abutment with the non-compensation ring (4) to form a friction pair.

3. A mechanical seal device for a water wall circulating pump according to claim 2, characterized in that: The shaft sleeve (1) comprises a first sleeve body (101) and a second sleeve body (102), the outer diameter of the first sleeve body (101) is smaller than that of the second sleeve body (102), the connecting section (81) is sleeved on the first sleeve body (101), the sealing section (82) on one side of the connecting section (81) is sleeved on the second sleeve body (102), and the sealing section (82) on the other side is sleeved on the compensation ring body (9). The first sleeve body (101), the second sleeve body (102), the connecting section (81) and the sealing section (82) on the side away from the compensation ring body (9) form the mounting cavity (6), and the conical cleaning ring (7) is arranged on the sealing section (82) on the side away from the compensation ring body (9).

4. A mechanical seal device for a water wall circulating pump according to claim 1, characterized in that: The first ring body (141) is sleeved on the shaft sleeve (1), a plurality of throttling grooves (17) are formed on the outer wall of the first ring body (141) in the circumferential direction of the first ring body (141), the outer wall of the first ring body (141) abuts against the gland (3), the second ring body (142) is arranged on the side of the first ring body (141) close to the conical cleaning ring (7), and the inner wall of the second ring body (142) and the outer wall of the shaft sleeve (1) have a liquid supplement gap (18) therebetween. The pumping grooves (15) are in communication with the liquid supplement gap (18).

5. A mechanical seal device for a water wall circulating pump as claimed in claim 1, wherein: The collecting groove (16) is provided with a stop block (19), the stop block (19) is located on one side of the flushing liquid outlet (22), one side of the stop block (19) close to the flushing liquid outlet (22) is provided with a flow guide slope (20), the flow guide slope (20) is aligned with the flushing liquid outlet (22), and the distance from the flow guide slope (20) to the axis of the rotating shaft (2) increases toward the direction close to the stop block (19).

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