Bushing for pump device and pump device

Abstract

The utility model discloses a bushing used for a pump device and the pump device, and relates to the field of pumps, the bushing used for the pump device comprises an annular body, a first end face, a second end face, a third end face, a fourth end face, a fifth end face and a sixth end face, the outer side wall of the body is provided with a first sealing structure, a second sealing structure and a concave air cavity located between the first sealing structure and the second sealing structure. The first end face is provided with a sunken cooling water cavity, and at least one position from the wall face forming the cooling water cavity to the inner side wall of the body through the first end face is provided with a third sealing structure. The mechanical sealing bush can solve the problems that an existing mechanical sealing bush is low in sealing reliability, inconvenient to mount and dismount and not easy and convenient to machine.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump field, especially a bushing for pump device and pump device. BACKGROUND

[0002] In the pump device field, especially in the centrifugal pump equipment for conveying high-temperature medium, in order to avoid medium leakage and guarantee the stability of equipment operation, mechanical seal structure is the mainstream sealing mode currently adopted. Mechanical seal is widely used in high-temperature medium conveying centrifugal pump owing to its advantages such as little leakage, even no leakage, convenient installation and removal and compact structure arrangement. But mechanical seal structure has inherent technical defects: the sealing surface is in continuous relative rotation state during equipment operation, and a large amount of heat will be generated due to friction, so the sealing surface needs to be cooled continuously to take away the friction heat in time. If the sealing surface is not cooled in time, the excessively high temperature will directly damage the structural integrity of the sealing surface, and further cause medium leakage problem. At the same time, the mechanical seal under high-temperature environment has strict requirements on operating conditions, and the sealing element is easily damaged due to improper operation, and in serious cases, the mechanical seal can even be completely disabled and cannot be restored to use through maintenance. Therefore, ensuring that the sealing surface temperature of mechanical seal is always below the limited threshold during operation is the core key to improve the working reliability of mechanical seal and prolong its service life.

[0003] In order to solve the problem of slow heat dissipation of mechanical seal, various mechanical seal front cooling chamber assemblies have been developed in the prior art, but these assemblies generally have many technical drawbacks, specifically manifested as complicated installation procedures, complex processing technology, or damaged sealing element and further caused medium leakage. Taking the mechanical seal bushing used in the same type of centrifugal pump on the market as an example, the bushing usually adopts a welded structure and is fixedly connected with the pump body through fasteners, and its structure form is shown in Figure 1 The structure has the following significant deficiencies: first, the reliability of the weld is extremely high, and the welding process parameters need to be strictly controlled during processing; second, the part needs to be first processed, then welded, and then the final size needs to be processed again after welding, so the production cost of the part is high; third, if the weld fails, it will directly cause medium leakage, and the maintenance of the welded structure part is extremely difficult and the maintenance procedure is complicated.

[0004] In summary, the mechanical seal cooling structure for high-temperature medium centrifugal pump currently has different degrees of technical defects, and it is urgent to develop a mechanical seal cooling structure with low process requirement, low processing cost and high sealing reliability to solve the problems in the prior art. UTILITY MODEL CONTENTS

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the utility model embodiment is to provide a bushing for a pump device and a pump device, which can solve the problems of low sealing reliability, inconvenient installation and disassembly, and inconvenient processing of the existing mechanical seal bushing.

[0006] The specific technical scheme of the utility model embodiment is:

[0007] A bushing for a pump device, the bushing for a pump device comprising:

[0008] A body in the shape of a ring, the body having opposite body outer sidewalls and body inner sidewalls, opposite first and second end faces, the body outer sidewalls having a first sealing structure, a second sealing structure, and an air cavity in the shape of a recess located between the first and second sealing structures; the first end face having a cooling water cavity in the shape of a recess, the wall surface forming the cooling water cavity having a third sealing structure at at least one position from the first end face to the body inner sidewalls.

[0009] Preferably, the cooling water cavity side wall of the cooling water cavity close to the body inner sidewalls has the third sealing structure.

[0010] Preferably, the body inner sidewalls of the body have a flow limiting structure.

[0011] Preferably, at least one of the first sealing structure, the second sealing structure, and the third sealing structure is in the form of a groove structure matched with a sealing ring.

[0012] Preferably, the flow limiting structure is in the form of a labyrinth type flow limiting groove.

[0013] Preferably, the body has a communication hole communicating the air cavity and the cooling water cavity;

[0014] The bushing for a pump device comprises a sealing member for sealing the communication hole.

[0015] Preferably, in the axial direction of the body, the projection of the air cavity and the projection of the cooling water cavity have an overlapping portion, and the communication hole is arranged at the cooling water cavity bottom wall of the cooling water cavity.

[0016] Preferably, the second end face is provided with a positioning hole for installing a positioning pin, which extends in the axial direction of the body.

[0017] A pump device, the pump device comprising:

[0018] A rotating shaft;

[0019] The mechanical seal mechanism and the pump inner shell are sleeved outside the rotating shaft, and a mounting chamber is formed between the pump inner shell and the rotating shaft, the mounting chamber is mounted with the mechanical seal mechanism and the bushing for the pump device, the first sealing structure and the second sealing structure on the body outer side wall are sealed against the mounting chamber inner side wall of the mounting chamber to seal the air chamber, and the mechanical seal mechanism outer side wall of the mechanical seal mechanism is sealed against the mounting chamber inner side wall of the mounting chamber through the fourth sealing structure to seal the cooling water chamber.

[0020] The pump inner shell has a first input channel and a first output channel which are in communication with the cooling water chamber.

[0021] Preferably, the body inner side wall of the bushing is provided with a flow limiting structure;

[0022] The bushing is sleeved outside the mechanical seal mechanism, the body inner side wall of the bushing is limited in flow between the mechanical seal mechanism outer side wall of the mechanical seal mechanism through the flow limiting structure, and the cooling water chamber is sealed and cut off from the gap between the pump inner shell and the rotating shaft through the third sealing structure.

[0023] Preferably, the mechanical seal mechanism outer side wall of the mechanical seal mechanism is formed with an embedding groove in the axial direction of the mechanical seal mechanism outer side wall, and the cooling water chamber and the body inner side wall of the body form an embedding part embedded in the embedding groove, so that the embedding part and the embedding groove are sealed through the third sealing structure.

[0024] Preferably, the pump inner shell further has a second input channel and a second output channel, and the mechanical seal mechanism has a water flow channel;

[0025] The mechanical seal mechanism outer side wall of the mechanical seal mechanism and the mounting chamber inner side wall of the mounting chamber are further sealed through a sixth sealing structure, the fourth sealing structure is closer to the cooling water chamber than the sixth sealing structure, the mechanical seal mechanism outer side wall of the mechanical seal mechanism and the mounting chamber inner side wall of the mounting chamber form a communication channel between the fourth sealing structure and the sixth sealing structure, one of the second input channel and the second output channel is in communication with one end of the water flow channel through the communication channel, and the other end of the water flow channel is in communication with the other of the second input channel and the second output channel.

[0026] The technical scheme of the utility model has the following remarkable beneficial effects:

[0027] The body of the bushing in the application has an air chamber in the form of a recess on the outer side wall of the body, and the air chamber is located between the first sealing structure and the second sealing structure, so as to ensure the sealing of the air chamber. The first end face of the body has a cooling water chamber in the form of a recess, and the wall surface forming the cooling water chamber has a third sealing structure at least at one position from the first end face to the inner side wall of the body, so as to ensure the sealing of the cooling water chamber through the third sealing structure and the first sealing structure. The cooling water chamber can be used to pass cooling water to cool the components in contact with the cooling water chamber, so as to ensure the sealing of the sealing structures installed at the components and prevent the sealing structures from failing due to excessive temperature. In addition, due to the presence of the air chamber, the thermal resistance between the second end face and the cooling water chamber can be as high as possible, the heat at the second end face is reduced to the sealing structures on the side of the air chamber away from the second end face, so as to reduce the possibility of the sealing structures failing due to excessive temperature, and the temperature of the low-temperature cooling water in the cooling water chamber is prevented from being transmitted to the high-temperature medium on the side of the second end face in the pump device, so as to prevent the thermal stratification of the high-temperature medium in the pump device, avoid the twist and deformation of the pump housing due to the large difference in thermal expansion and contraction at different positions of the pump housing caused by the large temperature difference, and cause the jamming between the shaft and the pump housing, thereby affecting the safe operation. Finally, due to the air chamber and the cooling water chamber on the outer side wall and the first end face of the body of the bushing respectively, the entire bushing is convenient to process, does not need any welding operation, and can be conveniently installed into the pump device.

[0028] Specific embodiments of the application are described in detail below with reference to the following description and drawings. The principles of the application can be applied in ways that differ from those explicitly described. It should be understood that the scope of the application is not limited to the scope of the embodiments described. Features described and / or illustrated in relation to one embodiment can be used in the same or similar way in one or more other embodiments, in combination with features of other embodiments, or instead of features of other embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present application in any way. In addition, the shapes and proportions of the components in the drawings are only illustrative and are used to help understand the application, and are not specific limitations on the shapes and proportions of the components of the application. Those skilled in the art can select various possible shapes and proportions to implement the application according to specific circumstances under the guidance of the application.

[0030] Figure 1 A schematic diagram of the bushing structure in the prior art;

[0031] Figure 2 A cross-sectional view of the bushing for the pump device in the embodiment of the application;

[0032] Figure 3 Figure 1 is a partial cross-sectional view of a pump device according to an embodiment of the present application.

[0033] Reference signs in the above drawings:

[0034] 1, bushing; 11, outer body wall; 12, inner body wall; 13, first end face; 14, second end face; 15, first sealing structure; 16, second sealing structure; 17, air chamber; 18, cooling water chamber; 181, cooling water chamber bottom wall; 182, cooling water chamber side wall; 19, third sealing structure; 110, flow limiting structure; 111, communication hole; 112, sealing element; 113, positioning hole; 114, positioning pin; 115, embedded portion; 2, rotating shaft; 3, mechanical sealing mechanism; 31, embedded groove; 32, communication passage; 33, fifth sealing structure; 34, outer mechanical sealing mechanism wall; 35, inner mechanical sealing mechanism wall; 4, pump inner housing; 41, mounting chamber; 411, mounting chamber inner wall; 42, first input passage; 43, first output passage; 44, second input passage; 45, second output passage; 51, fourth sealing structure; 52, sixth sealing structure; 6, shaft sleeve fixing ring; 7, bearing box; 8, bearing; 9, pump outer housing; 10, high-temperature medium flow channel. DETAILED DESCRIPTION

[0035] The details of the present application described herein can be more clearly understood with reference to the drawings and the description of specific embodiments of the present application. However, the specific embodiments of the present application described herein are only for the purpose of explaining the present application and should not be understood in any way as limiting the present application. Under the teachings of the present application, skilled persons can conceive of any possible variations based on the present application, which should be considered to fall within the scope of the present application.

[0036] In order to solve the problems of high processing and welding cost, high process requirement, and low sealing reliability of the existing mechanical sealing bushing, a bushing for a pump device is provided in the present application, Figure 2 Figure 1 is a cross-sectional view of a bushing for a pump device according to an embodiment of the present application, as Figure 2 shown, the bushing 1 for the pump device can include: a body in the form of a ring, having opposite outer body wall 11 and inner body wall 12, opposite first end face 13 and second end face 14, the outer body wall 11 has first sealing structure 15, second sealing structure 16 and air chamber 17 in the form of a recess between the first sealing structure 15 and the second sealing structure 16; the first end face 13 has a cooling water chamber 18 in the form of a recess, the wall surface forming the cooling water chamber 18 has a third sealing structure 19 through at least one position from the first end face 13 to the inner body wall 12.

[0037] This application also proposes a pump device. Figure 3 This is a partial cross-sectional view of the pump device in an embodiment of the present invention, such as... Figure 3 As shown, the pump device includes: a rotating shaft 2; a mechanical seal mechanism 3 sleeved outside the rotating shaft 2 and a pump inner housing 4. An installation chamber 41 is formed between the pump inner housing 4 and the rotating shaft 2. The mechanical seal mechanism 3 and a bushing 1 for the pump device are installed in the installation chamber 41. The first sealing structure 15 and the second sealing structure 16 on the outer wall 11 of the body of the bushing 1 abut against the inner wall 411 of the installation chamber 41 to seal the air chamber 17. The outer wall 34 of the mechanical seal mechanism 3 is sealed to the inner wall 411 of the installation chamber 41 through the fourth sealing structure 51. The third sealing structure 19 of the bushing 1 abuts against the mechanical seal mechanism 3 to seal the cooling water chamber 18. The pump inner housing 4 has a first input channel 42 and a first output channel 43 communicating with the cooling water chamber 18.

[0038] In this application, the bushing 1 has a recessed air chamber 17 on its outer side wall 11, and the air chamber 17 is located between the first sealing structure 15 and the second sealing structure 16, thus ensuring the airtightness of the air chamber 17. The first end face 13 of the body has a recessed cooling water chamber 18. Since the wall forming the cooling water chamber 18 has a third sealing structure 19 at at least one location from the first end face 13 to the inner side wall 12 of the body, the airtightness of the cooling water chamber 18 is ensured by the third sealing structure 19 and the first sealing structure 15. The cooling water chamber 18 can be used to circulate cooling water to cool the components in contact with the cooling water chamber 18, thereby ensuring the airtightness of the sealing structures installed at these components and preventing failure due to excessive temperature. Furthermore, the presence of the air chamber 17 maximizes the thermal resistance between the second end face 14 and the cooling water chamber 18, reducing heat transfer from the second end face 14 to the sealing structure on the side of the air chamber 17 away from the second end face 14. This reduces the likelihood of these sealing structures failing due to excessive temperature. It also prevents the low-temperature cooling water in the cooling water chamber 18 from transferring to the high-temperature medium on the second end face 14 side of the pump unit, thus avoiding thermal stratification of the high-temperature medium within the pump unit. This prevents excessive temperature differences from causing significant thermal expansion and contraction at different locations of the pump housing 4, which could lead to twisting and deformation, resulting in jamming with the rotating shaft 2 and affecting operational safety. Finally, because the bushing 1 has an air chamber 17 on its outer wall 11 and a cooling water chamber 18 on its first end face 13, the entire bushing 1 is easy to manufacture, requires minimal processing, requires no welding, and can be easily installed into the pump unit.

[0039] When the bushing 1 is installed in the mounting chamber 41 formed between the pump shaft 2 and the pump inner housing 4, the first sealing structure 15 and the second sealing structure 16 on the outer wall 11 of the bushing 1 abut against the inner wall 411 of the mounting chamber 41 of the pump inner housing 4, thereby sealing the air chamber 17. Since the mechanical seal mechanism 3 is installed in the mounting chamber 41, and the outer wall 34 of the mechanical seal mechanism 3 is sealed to the inner wall of the mounting chamber 41 by the fourth sealing structure 51, and the third sealing structure 19 of the bushing 1 abuts against the mechanical seal mechanism 3, in addition to the first sealing structure 15, the cooling water chamber 18 formed by the pump inner housing 4, the mechanical seal mechanism 3, and the bushing 1 can be in a sealed state. Cooling water can be continuously supplied to and discharged from the cooling water chamber 18 via the first input channel 42 and the first output channel 43 within the pump housing 4. This method cools the bushing 1 and the mechanical seal mechanism 3, thereby reducing the temperature of the first sealing structure 15, the second sealing structure 16, the third sealing structure 19, the fourth sealing structure 51, and other sealing structures on the mechanical seal mechanism 3 and the bushing 1, preventing seal failure due to excessive temperature. Since the bushing 1 only needs to abut against the inner wall 411 of the mounting chamber 41 of the pump housing 4 during installation, and the third sealing structure 19 of the bushing 1 abuts against the mechanical seal mechanism 3, the entire installation process of the bushing 1 in the pump device is very convenient and requires no other complicated operations.

[0040] To better understand the bushing and pump assembly used in this application, further explanation and description will follow. For example... Figure 2 As shown, the bushing 1 for the pump assembly may include a body. The body may be annular, specifically circular. The body may be fitted over the mechanical seal mechanism 3 of the pump assembly. The body has opposing outer side walls 11 and inner side walls 12, and opposing first end faces 13 and second end faces 14. The outer side walls 11 of the body have a first sealing structure 15, a second sealing structure 16, and a recessed air chamber 17 located between the first sealing structure 15 and the second sealing structure 16. When the bushing 1 is installed in conjunction with the pump inner housing 4, the first sealing structure 15 and the second sealing structure 16 can abut and seal against the pump inner housing 4, thereby sealing the air chamber 17.

[0041] like Figure 3 As shown, when the bushing 1 and the mechanical seal mechanism 3 are installed in the mounting chamber 41 formed between the pump inner housing 4 and the rotating shaft 2, the second end face 14 of the bushing 1 abuts against the right side wall of the mounting chamber 41 to achieve a limiting position; at least a portion of the first end face 13 of the bushing 1 abuts against the right side of the mechanical seal mechanism 3 to achieve a limiting position.

[0042] like Figure 2 andFigure 3 As shown, the pump inner housing 4 is sleeved on the rotating shaft 2, and there is a gap between the pump inner housing 4 on the right side of the installation chamber 41 and the rotating shaft 2. The high-temperature medium flow channel 10 is present in the pump inner housing 4 on the right side of the installation chamber 41. The high-temperature medium in the high-temperature medium flow channel 10 can flow to the left through the gap, thereby contacting the part of the second end surface 14 of the bushing 1, so that the temperature of the bushing 1 is increased. Further, the pump inner housing 4 can be sleeved with a pump outer housing 9. The clamping limiting position of the pump inner housing 4 and the pump outer housing 9 can be sealingly matched, so that the pump outer housing 9 can jointly form the high-temperature medium flow channel 10 with the pump inner housing 4.

[0043] As shown in Figure 2 and Figure 3 , the first end surface 13 has a recessed cooling water chamber 18. The cooling water chamber 18 can be annular. The cooling water chamber 18 can be filled with cooling water, thereby cooling the bushing 1, and also cooling the components in contact with the cooling water chamber 18, ensuring the sealing of the sealing structure installed at the bushing 1 and these components, and preventing failure due to excessive temperature. The wall surface (which can be the cooling water chamber bottom wall 181, or any one of the two cooling water chamber side walls 182) forming the cooling water chamber 18 has a third sealing structure 19 through at least one position from the part of the first end surface 13 to the body inner side wall 12. When the bushing 1 is installed in cooperation with the mechanical seal mechanism 3 of the pump device, the third sealing structure 19 can be sealed against the mechanical seal mechanism 3, and the first sealing structure 15 can be cooperated to make the cooling water chamber 18 closed (here, the closed does not include the first input channel 42 and the first output channel 43 closed communication with the cooling water chamber 18).

[0044] In order to improve the sealing between the bushing 1 and the mechanical seal mechanism 3, the radial direction sealing is adopted between the bushing 1 and the mechanical seal mechanism 3, therefore, as feasible, as shown in Figure 2 and Figure 3 , the cooling water chamber side wall 182 of the cooling water chamber 18 close to the body inner side wall 12 has a third sealing structure 19. When the cooling water chamber side wall 182 of the cooling water chamber 18 close to the body inner side wall 12 is in contact with the mechanical seal mechanism 3 in the radial direction, the sealing between the two is realized through the third sealing structure 19. In this way, the high-temperature medium on the second end surface 14 side in the pump device can enter the inside of the mechanical seal after passing through the gap between the body inner side wall 12 of the bushing 1 and the mechanical seal mechanism 3, but cannot enter the cooling water chamber 18.

[0045] In the above embodiments, at least one of the first sealing structure 15, the second sealing structure 16 and the third sealing structure 19 can adopt the form of a groove structure matching sealing ring. In general, the sealing ring can adopt an O-shaped sealing ring. Of course, the first sealing structure 15, the second sealing structure 16 and the third sealing structure 19 can also adopt other sealing structures, which are not limited in the present application.

[0046] As shown in Figure 3 , the mounting chamber of the bushing 1 has a first step at the mounting chamber inner side wall 411, and the mechanical seal mechanism outer side wall 34 of the mechanical seal mechanism 3 has a second step matched with the first step for installation. When the mechanical seal mechanism 3 is installed, the mechanical seal mechanism 3 can be fixed on the pump inner housing 4 in the axial direction through fasteners such as bolts. The mechanical seal mechanism 3 can include a shaft sleeve, and the remaining components are installed on the shaft sleeve. In order to limit the left end of the mechanical seal mechanism 3, the shaft sleeve fixing ring 6 is sleeved on the shaft 2 to abut against the left end of the mechanical seal mechanism 3. Specifically, the shaft sleeve fixing ring 6 abuts against the left end of the shaft sleeve in the mechanical seal mechanism 3 and fixes the shaft sleeve in the mechanical seal mechanism 3 in the circumferential direction, so that the shaft sleeve in the mechanical seal mechanism 3 can rotate with the shaft 2. The axial positioning of the shaft sleeve in the mechanical seal mechanism 3 is achieved by embedding the half split clasp in the groove on the shaft 2 and clamping from the inside of the shaft sleeve fixing ring 6.

[0047] As shown in Figure 3 , the pump device can include a bearing box 7. The bearing box 7 is sleeved on the shaft 2, and the bearing box 7 is located on the left side of the pump inner housing 4 and abuts against the pump inner housing 4. The bearing box 7 can cooperate with the pump inner housing 4 to form a mounting chamber 41. When the bearing box 7 is not installed on the shaft 2, the bushing 1, the mechanical seal mechanism 3, the shaft sleeve fixing ring 6 and other components can be installed in the mounting chamber 41. The bearing box 7 is installed with a bearing 8 matched with the shaft 2.

[0048] As feasible, as shown in Figure 2 and Figure 3As shown, the inner side wall 12 of the body has a flow limiting structure 110. The bushing 1 can be sleeved outside the mechanical seal mechanism 3, specifically, the bushing 1 can be sleeved at the end of the right end of the mechanical seal mechanism 3. The flow limiting structure 110 limits the flow between the bushing 1 and the mechanical seal mechanism 3, the cooling water chamber 18 is sealed from the gap between the pump inner casing 4 and the rotating shaft 2 by the third sealing structure 19, and the flow limiting structure 110 can limit the flow of the high-temperature medium on the side of the second end face 14 through the gap between the inner side wall 12 of the body of the bushing 1 and the mechanical seal mechanism 3 to the third sealing structure 19, thereby preventing the third sealing structure 19 from failing due to excessive temperature. In addition, the flow limiting structure 110 can also limit the flow of the high-temperature medium on the side of the second end face 14 through the gap between the inner side wall 12 of the body of the bushing 1 and the mechanical seal mechanism 3 into the mechanical seal mechanism 3, so that a small amount of high-temperature medium entering the inside of the mechanical seal mechanism 3 can be fully cooled by the cooling water of the cooling water chamber 18. Specifically, the flow limiting structure 110 can adopt the form of a labyrinth type flow limiting groove, which is simple and convenient, and will not fail due to excessive temperature.

[0049] As shown in Figure 2 and Figure 3 , the mechanical seal mechanism outer side wall 34 of the mechanical seal mechanism 3 is formed with an embedding groove 31 along the axial direction thereof, and the cooling water chamber 18 of the body and the inner side wall 12 of the body form an embedding part 115 embedded in the embedding groove 31, so that the embedding part 115 and the embedding groove 31 are sealed by the third sealing structure 19. In this way, the bushing 1 and the mechanical seal mechanism 3 can be radially sealed by the third sealing structure 19, which helps to avoid sealing failure at the structure.

[0050] As shown in Figure 2 , the body has a communication hole 111 communicating the air chamber 17 and the cooling water chamber 18. The bushing 1 for the pump device comprises a sealing member 112 for sealing the communication hole 111. When the bushing 1 is installed, the communication hole 111 is first opened, so that the air chamber 17 is communicated with the outside, the difficulty of installation is reduced, the bushing 1 is ensured to be installed in place, and the first sealing structure 15 and the second sealing structure 16 are sealed by abutting against the pump inner casing 4. After the bushing 1 is installed, the communication hole 111 is sealed by the sealing member 112 to prevent the air chamber 17 and the cooling water chamber 18 from being communicated in the later period, thereby destroying the heat insulation effect.

[0051] Further, in the axial direction of the body, as shown in Figure 2As shown, the projection of the air chamber 17 can have an overlapping portion with the projection of the cooling water chamber 18, and the communication hole 111 is formed at the cooling water chamber bottom wall 181 of the cooling water chamber 18. In this way, on one hand, the machining of the communication hole 111 can be facilitated, and on the other hand, the air chamber 17 can have a larger size in the radial direction, and the cooling water chamber 18 can be better separated from the second end surface 14 of the body, so as to further increase the thermal resistance between the two.

[0052] As feasible, as shown in Figure 2 and Figure 3 As shown, the second end surface 14 is provided with a positioning hole 113 for mounting a positioning pin 114, which extends along the axial direction of the body. When the bushing 1 is mounted in cooperation with the pump inner shell 4, the positioning pin 114 is inserted into the positioning hole 113 of the bushing 1 and the pump inner shell 4 respectively, so as to achieve circumferential positioning of the bushing 1 and the pump inner shell 4, and prevent the bushing 1 from rotating.

[0053] The fourth sealing structure 51 can adopt a form of a groove structure cooperating with a sealing ring, or other sealing structures, which are not limited in the present application.

[0054] It should be noted that the mechanical seal mechanism 3 can be a mechanism formed by cooperation and connection of multiple components, and in Figure 3 , it is simply drawn as one component, and a water flow channel can be formed in the mechanical seal mechanism 3. The water flow channel is in communication with the gap between the body inner side wall 12 of the bushing 1 and the mechanical seal mechanism 3 at the embedded groove 31.

[0055] As feasible, the pump inner shell 4 further has a second input channel 44 and a second output channel 45. As shown in Figure 3 As shown, the mechanical seal mechanism outer side wall 34 of the mechanical seal mechanism 3 and the mounting chamber inner side wall 411 of the mounting chamber 41 are further sealed by a sixth sealing structure 52, and the fourth sealing structure 51 is closer to the cooling water chamber 18 than the sixth sealing structure 52. The mechanical seal mechanism outer side wall 34 of the mechanical seal mechanism 3 and the mounting chamber inner side wall 411 of the mounting chamber 41 form a communication channel 32 between the fourth sealing structure 51 and the sixth sealing structure 52. One of the second input channel 44 and the second output channel 45 is in communication with one end of the water flow channel through the communication channel 32, and the other end of the water flow channel is in communication with the other one of the second input channel 44 and the second output channel 45. Water can enter the water flow channel in the mechanical seal mechanism 3 through the second input channel 44, and then flow out from the second output channel 45, so that the mechanical seal mechanism 3 can be flushed by water to remove internal impurities (due to the mechanical seal mechanism 3 being Figure 3The mechanical seal mechanism 3 is simplified as one component, and it is emphasized that the mechanical seal mechanism 3 has an inlet and an outlet of the water flow channel at positions corresponding to the second input channel 44 and the second output channel 45, respectively); in addition, the mechanical seal mechanism 3 can also play a role in cooling. Since the water flow channel in the mechanical seal mechanism 3 is in communication with the high-temperature medium flow channel 10, that is, the high-temperature medium flow channel 10 will pass through the gap between the pump inner shell 4 and the rotating shaft 2, the flow-limiting structure 110 between the outer wall 34 of the mechanical seal mechanism 3 and the liner 1, the embedding groove 31 of the mechanical seal mechanism 3, and the water flow channel in the mechanical seal mechanism 3 (since the mechanical seal mechanism 3 has an inlet and an outlet of the water flow channel at the position of the embedding groove 31), therefore, the water flowing into the second input channel 44 can be the high-temperature medium in the high-temperature medium flow channel 10 in the pump device that has been output and cooled, which can ensure the consistency of the fluid type. As a possibility, the cooling water input into the first input channel 42 and the water flowing into the second input channel 44 are from different sources. Figure 3 The mechanical seal mechanism 3 is simplified as one component, and it is emphasized that the mechanical seal mechanism 3 has an inlet and an outlet of the water flow channel at the position of the embedding groove 31, therefore, the water flowing into the second input channel 44 can be the high-temperature medium in the high-temperature medium flow channel 10 in the pump device that has been output and cooled, which can ensure the consistency of the fluid type. As a possibility, the cooling water input into the first input channel 42 and the water flowing into the second input channel 44 are from different sources.

[0056] In order to prevent the high-temperature medium in the high-temperature medium flow channel 10 from flowing to the left through the gap and then flowing into the mechanical seal mechanism 3 and the rotating shaft 2, and further diffusing to the outside through the shaft sleeve fixing ring 6, the mechanical seal mechanism 3 and the rotating shaft 2 are provided with a fifth sealing structure 33. As a possibility, the fifth sealing structure 33 can be arranged at the inner wall 35 of the mechanical seal mechanism of the mechanical seal mechanism 3. The fifth sealing structure 33 can be one, or multiple. Similarly, the fifth sealing structure 33 can adopt the form of a groove structure cooperating with a sealing ring, or other sealing structures, which are not limited in the present application.

[0057] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "consisting essentially of to describe combinations shall include the elements, ingredients, components or steps identified, and such other elements, ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, ingredients, components or steps herein also contemplates embodiments that "consist essentially of the elements, ingredients, components or steps. By use of the term "may" herein, it is intended that any stated attribute can or can not be present. Plural elements, ingredients, components or steps can be provided by a single integrated element, ingredient, component or step. Alternatively, a single integrated element, ingredient, component or step might be divided into separate plural elements, ingredients, components or steps. To "comprise" or "comprising", "containing" or "containing", "include" or "including" or "having" an element or a list of elements means that the element or at least one of the list of elements is present. Individual components or steps should not be construed as required unless the context specifically indicates otherwise.

[0058] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between various embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable persons skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit and essence of the utility model shall be covered within the protection scope of the utility model.

Claims

1. A bushing for a pump assembly, characterized in that, The bushing for the pump assembly includes: The body is annular, having opposing outer walls and inner walls, opposing first and second end faces. The outer walls have a first sealing structure, a second sealing structure, and a recessed air chamber located between the first and second sealing structures. The first end face has a recessed cooling water chamber, and the wall forming the cooling water chamber has a third sealing structure at at least one location from the first end face to the inner wall.

2. The bushing for a pump assembly according to claim 1, characterized in that, The cooling water chamber has the third sealing structure on the side wall of the cooling water chamber near the inner wall of the main body.

3. The bushing for a pump assembly according to claim 1, characterized in that, The inner wall of the body has a flow-limiting structure.

4. The bushing for a pump assembly according to claim 1, characterized in that, At least one of the first sealing structure, the second sealing structure and the third sealing structure adopts a groove structure in conjunction with a sealing ring.

5. The bushing for a pump assembly according to claim 3, characterized in that, The current limiting structure adopts the form of a labyrinth-shaped current limiting groove.

6. The bushing for a pump assembly according to claim 1, characterized in that, The main body has a connecting hole that connects the air chamber and the cooling water chamber; The bushing for the pump assembly includes a seal for sealing the connecting hole.

7. The bushing for a pump assembly according to claim 6, characterized in that, In the axial direction of the body, the projection of the air chamber and the projection of the cooling water chamber overlap, and the connecting hole is opened at the bottom wall of the cooling water chamber.

8. The bushing for a pump assembly according to claim 1, characterized in that, The second end face has a positioning hole extending along the axial direction of the body for mounting a positioning pin.

9. A pump device, characterized in that, The pump device includes: Shaft; A mechanical seal mechanism and a pump inner housing are fitted outside the rotating shaft. An installation chamber is formed between the pump inner housing and the rotating shaft. The mechanical seal mechanism and a bushing for a pump device as described in any one of claims 1 to 8 are installed in the installation chamber. The first sealing structure and the second sealing structure on the outer wall of the main body abut against and seal against the inner wall of the installation chamber to seal the air chamber. The outer wall of the mechanical seal mechanism is sealed against the inner wall of the installation chamber through a fourth sealing structure. The third sealing structure of the bushing abuts against and seals against the mechanical seal mechanism to seal the cooling water chamber. The pump housing has a first input channel and a first output channel that communicate with the cooling water chamber.

10. The pump device according to claim 9, characterized in that, The bushing has a flow-limiting structure on the inner wall of its main body; The bushing is fitted outside the mechanical seal mechanism. The inner wall of the bushing body restricts the flow between itself and the outer wall of the mechanical seal mechanism through the flow-limiting structure. The cooling water chamber is sealed and isolated from the gap between the pump inner housing and the rotating shaft through the third sealing structure.

11. The pump device according to claim 9, characterized in that, The mechanical seal mechanism has an embedded groove formed on its outer side wall along its own axial direction. An embedded part is formed between the cooling water chamber of the body and the inner side wall of the body, so that the embedded part and the embedded groove are sealed by the third sealing structure.

12. The pump device according to claim 9, characterized in that, The pump housing also has a second input channel and a second output channel; the mechanical seal mechanism has a water flow channel. The outer wall of the mechanical seal mechanism and the inner wall of the mounting chamber are further sealed by a sixth sealing structure. The fourth sealing structure is closer to the cooling water chamber than the sixth sealing structure. A communication channel is formed between the outer wall of the mechanical seal mechanism and the inner wall of the mounting chamber. One of the second input channel and the second output channel is connected to one end of the water flow channel through the communication channel, and the other end of the water flow channel is connected to the other of the second input channel and the second output channel.

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