Canned motor pump having good heat-insulating and sealing effects, and heat-insulating and sealing method

Abstract

A canned motor pump having good heat-insulating and sealing effects and a heat-insulating and sealing method. The canned motor pump comprises a pump body, an electric motor and a heat-insulating and sealing mechanism. The heat-insulating and sealing mechanism has an outer heat-insulating ring and an inner heat-insulating ring, wherein the outer heat-insulating ring has at least one outer recessed cavity; the inner heat-insulating ring has at least one inner recessed cavity; and the axis of the inner heat-insulating ring is parallel to that of the outer heat-insulating ring, a notch on the inner heat-insulating ring is fixed on an inner wall of the outer heat-insulating ring, and an inner wall of the outer heat-insulating ring does not seal the notch of the inner heat-insulating ring. A rotor of the electric motor passes through a ring hole of the inner heat-insulating ring and is in clearance fit with the ring hole. Sealing flat gaskets are respectively provided between the pump body and the outer heat-insulating ring and between a stator of the electric motor and the outer heat-insulating ring, and each sealing flat gasket is subjected to a compressive force therebetween.

Description

A shielded pump with superior thermal insulation and sealing effect and a thermal insulation and sealing method Technical Field

[0001] This invention relates to the field of heat insulation sealing for canned motor pumps, and in particular to a canned motor pump and a heat insulation sealing method with superior heat insulation sealing effect. Background Technology

[0002] A canned motor pump consists of a pump body and a motor, essentially functioning as a pressure vessel. It is commonly used in high-temperature, high-pressure environments, such as for transporting toxic and hazardous liquids in the chemical and pharmaceutical industries, fuel loading before rocket launches in aerospace, nuclear-grade canned motor pumps in nuclear power plants, air conditioning circulating water systems, and ground-source heat pumps in heating and cooling circulating water systems. The entire canned motor pump (pressure vessel) is filled with a high-pressure medium, requiring the internal temperature of the pressure vessel to be maintained at a high temperature on the pump side and a low temperature on the motor side.

[0003] For the thermal insulation sealing of canned motor pumps, existing technical solutions mainly use double-cone gaskets. Double-cone gasket seals are commonly used on pressure vessels, relying on bolt tightening to cause the soft gasket to plastically deform and achieve an initial seal. Under the pressure of the medium inside the pressure vessel, the double-cone rings expand radially, achieving radial self-tightening. The main problems with double-cone gasket seals include: at the two ends of a pressure vessel with a significant temperature difference, the radial deformation dimensions of the double-cone gasket and the soft gasket differ due to the temperature difference, leading to seal leakage; double-cone seals are difficult to insulate against high temperatures, allowing high temperatures to be transferred to the low-temperature end, affecting equipment lifespan and sealing performance; the manufacturing and precision requirements for double-cone gaskets are high; scratches on the gasket will cause seal leakage, and the production, transportation, and storage of the gasket require high-standard maintenance; double-cone seals are highly dependent on installation workers; insufficient experience and slight installation deviations will result in leakage under high temperature and pressure conditions; when encountering large seal dimensions, the dimensional accuracy of the double-cone gasket and soft gasket is difficult to guarantee, making installation difficult and failing to achieve the ideal sealing effect.

[0004] In summary, the double cone gasket seal is complex to install, manufacture, and maintain during the production process, and carries a certain risk of leakage, making it uneconomical. Therefore, a new technical solution is needed in this field to address this technical problem. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems by providing a shielded pump and a heat-insulating sealing method with superior heat insulation and sealing performance. This method can effectively prevent heat transfer between the high-temperature medium inside the pump body and the low-temperature medium on the motor side, reducing the impact of the high-temperature medium on the low-temperature medium. It can also effectively reduce the degree of pulling, squeezing, and kneading of the sealing gasket during the alternating high and low temperatures, effectively ensuring that the medium will not leak even under high temperature and high pressure (temperature changes) conditions for a long time.

[0006] The technical solution adopted in this invention is as follows: A shielded pump with superior heat insulation and sealing effect includes a pump body and a motor. A heat insulation and sealing mechanism is coaxially assembled between the pump body and the motor. The heat insulation and sealing mechanism includes an outer heat insulation ring and an inner heat insulation ring. The outer heat insulation ring has at least one concave annular outer cavity; the inner heat insulation ring has at least one concave annular inner cavity; the axes of the inner heat insulation ring and the outer heat insulation ring are parallel, and the notch on the inner heat insulation ring is fixed to the inner wall of the outer heat insulation ring. The inner wall of the outer heat insulation ring does not seal the notch of the inner heat insulation ring; the rotor of the motor passes through the annular hole of the inner heat insulation ring and is clearance-fitted with the annular hole; sealing gaskets are provided between the pump body and the outer heat insulation ring, and between the stator of the motor and the outer heat insulation ring, and the sealing gaskets are subjected to compressive force.

[0007] Furthermore, the two ends of the external heat insulation ring are provided with annular positioning bosses, the axes of which are collinear with the axis of the external heat insulation ring. Annular positioning grooves are provided at corresponding positions on the pump body and the stator, and the shape and size of the positioning grooves match the positioning bosses. The sealing gasket is located in the positioning groove.

[0008] Furthermore, the pump body and the stator of the motor are connected by multiple bolts, and an external heat insulation ring is pressed between the pump body and the stator.

[0009] Furthermore, multiple bolts are arranged circumferentially along the axis of the pump body and / or the stator of the motor and / or the external insulation ring.

[0010] Furthermore, the external heat insulation ring has an external concave cavity.

[0011] Furthermore, the inner heat insulation ring has multiple concave cavities arranged along the axis of the inner heat insulation ring.

[0012] Furthermore, the axis of the inner heat insulation ring is collinear with the axis of the outer heat insulation ring.

[0013] Furthermore, the canned pump also includes a shielding sleeve for sealing and isolating the stator and rotor, with the end of the shielding sleeve being sealed and fixedly connected to the inner wall of the outer heat insulation ring.

[0014] Furthermore, the material used to prepare the end of the external heat insulation ring that is attached to the pump body is the same as the material used to prepare the pump body; the material used to prepare the end of the external heat insulation ring that is attached to the stator is the same as the material used to prepare the stator.

[0015] A method for heat insulation and sealing of a canned motor pump, using the aforementioned canned motor pump for high-temperature and high-pressure environments, includes heat insulation and sealing; wherein:

[0016] Thermal insulation is divided into external thermal insulation and internal thermal insulation;

[0017] External insulation: The concave cavity of the external insulation ring increases the distance between the pump body and the motor, thus increasing the heat transfer distance between the pump body and the motor. At the same time, when the heat is transferred between the pump body and the motor through the external insulation ring, it needs to pass through the air, which reduces the thermal conductivity between the high-temperature medium and the low-temperature medium. This reduction in thermal conductivity achieves external insulation between the pump body and the motor.

[0018] Internal insulation: An internal insulation ring fills the cross-section of the medium convection between the pump body and the motor, and the internal insulation ring is fitted with the rotor with a clearance to reduce the medium convection between the pump body and the motor, thus reducing convective heat transfer between the high-temperature and low-temperature media; at the same time, the inner cavity is filled with the medium, and when the pump body and the motor transfer heat through the internal insulation ring, the medium needs to pass through the medium in the inner cavity step by step, thus reducing the thermal conductivity between the high-temperature and low-temperature media; the reduction of convective heat transfer and thermal conductivity achieves internal insulation between the pump body and the motor.

[0019] Sealing: Due to the presence of heat insulation, compared to the direct contact between the pump body and the motor, the temperature difference between the two ends of the sealing gasket is smaller. The deformation of the pump body and the external heat insulation ring, and the deformation of the stator and the external heat insulation ring at both ends of the sealing gasket are smaller, and the radial tension on the sealing gasket is smaller. Furthermore, when the temperature of the medium fluctuates, the temperature at both ends of the external heat insulation ring will fluctuate in the same way. The deformation at both ends of the external heat insulation ring is the same as the deformation of the pump body and the stator, respectively. The sealing gasket at the corresponding position will not be rubbed. The possibility of the sealing gasket being damaged is reduced, and the sealing effect is maintained for a longer period of time.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] This invention, through a heat-insulating sealing mechanism, can both prevent heat transfer between the high-temperature medium inside the pump body and the low-temperature medium on the motor side, reducing the impact of the high-temperature medium on the low-temperature medium; and effectively reduce the degree of pulling, squeezing and kneading of the sealing gasket during the alternating high and low temperatures, effectively ensuring that the medium will not leak for a long time in a high-temperature and high-pressure environment (where the temperature will change). Attached Figure Description

[0022] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0023] Figure 1 is a schematic diagram of the structure of the present invention;

[0024] The markings in the diagram are: 1-external heat insulation ring; 11-external concave cavity; 12-positioning boss; 2-internal heat insulation ring; 21-inner concave cavity; 3-stator; 4-rotor; 5-pump body; 51-positioning groove; 6-sealing gasket; 7-shielding sleeve. Embodiments of the present invention

[0025] In the description of this invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0026] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this invention does not imply that the components are required to be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms “set,” “install,” “connect,” and “link” should be interpreted broadly. For example, a link can be a fixed link, a detachable link, or an integral link; it can be a mechanical link or an electrical link; it can be a direct link or an indirect link through an intermediate medium; or it can be a connection within two components.

[0028] Example 1

[0029] As shown in Figure 1, a canned motor pump with superior heat insulation and sealing performance includes a pump body 5 and a motor. A heat insulation and sealing mechanism is coaxially mounted between the pump body 5 and the motor. In fact, both the pump body 5 and the motor are conventional structures of canned motor pumps, and their specific structures are known to those skilled in the art. The canned motor pump disclosed in this embodiment is essentially a conventional canned motor pump with an added heat insulation and sealing mechanism. This achieves the goal of "both preventing heat transfer between the high-temperature medium inside the pump body and the low-temperature medium on the motor side, reducing the impact of the high-temperature medium on the low-temperature medium; and effectively reducing the degree of radial pulling and squeezing of the sealing gasket during alternating high and low temperatures, effectively ensuring that the medium will not leak for a long time under high temperature and high pressure (temperature changes) conditions." The specifics are as follows.

[0030] The heat insulation sealing mechanism, on the one hand, is located between the pump body 5 and the motor, isolating the pump body 5 from the motor and increasing the distance between them, thus preventing direct contact between the pump body 5 and the motor. This increases the heat transfer distance between the pump body 5 and the motor, reducing the heat transfer between the high-temperature medium in the pump body 5 and the low-temperature medium in the motor, thereby achieving the purpose of heat insulation. On the other hand, the specific structure of the heat insulation sealing mechanism can produce a good heat insulation effect, and also has the advantage of maintaining a sealing effect; the specifics are as follows.

[0031] In this embodiment, the heat insulation sealing mechanism includes an outer heat insulation ring 1 and an inner heat insulation ring 2. The outer heat insulation ring 1 has at least one concave annular outer cavity 11. The presence of the outer cavity 11 requires air to pass through when heat is transferred between the pump body 5 and the motor via the outer heat insulation ring 1, thereby achieving air insulation, which reduces the heat conduction between the high-temperature medium and the low-temperature medium, and thus achieves external heat insulation between the pump body 5 and the motor. The inner heat insulation ring 2 has at least one concave annular inner cavity 21. The axis of the inner heat insulation ring 2 is parallel to that of the outer heat insulation ring 1, and the notch on the inner heat insulation ring 2 is fixed to the inner wall of the outer heat insulation ring 1, that is, the notch of the inner cavity 21 faces the inner wall of the outer heat insulation ring 1. The inner wall of the outer heat insulation ring 1 does not seal the notch of the inner heat insulation ring 2. For example, the inner heat insulation ring 2 and the outer heat insulation ring 1 are fixedly non-sealed by spot welding along the circumference. The design and assembly of the inner heat insulation ring 2 ensures that the inner heat insulation ring 2 fills the pump body 5. The convection cross-section between the high-temperature medium inside the pump body 5 and the low-temperature medium inside the motor is reduced, and the medium inside the canned pump can enter the concave cavity 21. This reduces convection between the high-temperature medium inside the pump body 5 and the low-temperature medium inside the motor (convection is reduced in two ways: firstly, the presence of the internal heat insulation ring 2 reduces the convection cross-sectional area; secondly, the fixed but not sealed connection between the internal heat insulation ring 2 and the external heat insulation ring 1 ensures that there is no large gap at the connection point between the internal heat insulation ring 2 and the external heat insulation ring 1. Combined with the setting of the concave cavity 21, the convection flow between the high-temperature medium and the low-temperature medium at the concave cavity 21 is small). This reduces convective heat transfer between the high-temperature medium and the low-temperature medium, achieving internal insulation. On the other hand, the "step-by-step multi-stage water insulation principle" is used, meaning that the heat transfer from the high-temperature medium to the low-temperature medium needs to pass through the medium inside the concave cavity 21, thereby reducing the heat conduction between the high-temperature medium and the low-temperature medium, further achieving internal insulation. External insulation and internal insulation complement each other, ensuring the insulation effect of the sealing insulation mechanism, so that the canned pump can adapt to high-temperature environments.

[0032] It should be noted that, in this embodiment, the non-sealed fixed connection between the internal heat insulation ring 2 and the external heat insulation ring 1 allows the medium pressure in the concave cavity 21 to balance the high-temperature medium pressure in the pump body 5 and the low-temperature medium pressure in the motor, thereby preventing the internal heat insulation ring 2 from being damaged due to pressure difference and ensuring a long service life.

[0033] In this embodiment, the annular hole of the internal heat insulation ring 2 can be clearance-fitted with the rotor 4 of the motor. Clearance fit is a conventional fit method in the assembly of shaft-type parts and ring or sleeve-type parts. As is well known, clearance fit can effectively avoid contact friction between the rotor 4 (shaft-type part) and the internal heat insulation ring 2 (ring or sleeve-type part), thereby avoiding frictional heat generation and reducing component wear. However, in this embodiment, on the one hand, it avoids frictional heat generation from affecting component lifespan, and on the other hand, clearance fit can minimize the convection cross-section between the high-temperature medium and the low-temperature medium, minimize the convective heat transfer between the high-temperature medium and the low-temperature medium, and improve the heat insulation effect.

[0034] It should be noted that for the external heat insulation ring 1, the large temperature difference between the two ends, resulting in differences in axial deformation and radial deformation, can be provided by the bottom deformation of the outer concave cavity 11, thereby adapting to the heating of the overall structure.

[0035] In this embodiment, sealing gaskets 6 are provided between the pump body 5 and the external heat insulation ring 1, and between the motor stator 3 and the external heat insulation ring. The sealing gaskets 6 are subjected to compressive force. The sealing gaskets 6 are annular, surrounding the pump body 5, the external heat insulation ring 1, and the stator 3, effectively preventing leakage of the medium from the gaps where the pump body 5 and the external heat insulation ring 1, and the stator 3 and the external heat insulation ring 1 are in contact, thus enabling the canned motor pump to adapt to high-pressure environments. Regarding sealing, the heat insulation implementation disclosed in this embodiment effectively solves the sealing problems.

[0036] Specifically, as described in the background art, on the one hand, when there is a large temperature difference at the sealing position of the sealing structure (such as a double cone gasket seal or a flat gasket seal), that is, when there is a large temperature difference between the two ends of the sealing structure, the deformation of the components in contact with the two ends of the sealing structure due to thermal expansion and contraction is large, which will cause radial pulling on the sealing structure and damage it. On the other hand, when there are independent temperature fluctuations at the two ends of the sealing structure (the temperature change of the environment at one end of the sealing structure is independent of the temperature change of the environment at the other end of the sealing structure), the structures at both ends of the sealing structure are prone to rubbing against the sealing structure and damaging it. The heat-insulating sealing mechanism of the shielded pump proposed in this embodiment can effectively solve this problem, as detailed below.

[0037] The presence of the thermal insulation sealing mechanism makes the thermal system inside the pump body and the thermal system on the motor side more independent, that is, the temperature at the pump body is unlikely to affect the temperature on the motor side. Under this premise, compared with the direct contact between the pump body 5 and the motor, the temperature difference between the two ends of the sealing structure (sealing gasket 6) is smaller, that is, the temperature difference between the pump body 5 and the external thermal insulation ring 1 is smaller, and the temperature difference between the stator 3 and the external thermal insulation ring 1 is smaller. For ease of explanation, the sealing gasket 6 installed between the pump body 5 and the external thermal insulation ring 1 is used as an example for explanation, as follows.

[0038] Specifically, on the one hand, there is a small temperature difference between the pump body 5 and one end of the external heat insulation ring 1. The deformation and deformation mode of the pump body 5 and the external heat insulation ring 1 are basically the same. The radial tension on the sealing gasket 6 is smaller, or even not at all, from the pump body 5 and the external heat insulation ring 1. Thus, the possibility of the sealing gasket 6 being damaged by radial tension is reduced, ensuring the sealing effect and long-term sealing. On the other hand, when the high-temperature medium inside the pump body 5 experiences temperature fluctuations, because there is a small temperature difference between the pump body 5 and one end of the external heat insulation ring 1, the pump body 5 and one end of the external heat insulation ring 1 can be regarded as being in the same thermal system. That is, the temperature change of the external heat insulation ring 1 is positively correlated with the temperature of the pump body 5. The end of the external heat insulation ring 1 that is attached to the pump body 5 undergoes the same thermal expansion and contraction deformation. Therefore, the sealing gasket 6 is basically not subjected to rubbing from the pump body 5 and the external heat insulation ring 1. Thus, the possibility of the sealing gasket 6 being rubbed is reduced, ensuring the sealing effect and long-term sealing.

[0039] Example 2

[0040] Based on Example 1, further feasible implementation methods are proposed.

[0041] In one feasible implementation, annular positioning bosses 12 are provided at both ends of the external heat insulation ring 1. The axis of the positioning bosses 12 is collinear with the axis of the external heat insulation ring 1. Annular positioning grooves 51 are provided at corresponding positions on the pump body 5 and the stator 3. The shape and size of the positioning grooves 51 match the positioning bosses 12. The sealing gasket 6 is located in the positioning groove 51. Providing the positioning bosses 12 and the positioning grooves 51, and placing the sealing gasket 6 in the positioning grooves 51, has at least the following effects.

[0042] 1. Facilitates coaxial assembly; The positioning boss 12 and positioning groove 51 serve as the basis for positioning assembly. That is, the positioning boss 12 is inserted into the positioning groove 51, which ensures the coaxial assembly accuracy of the pump body 5, the stator 3 of the motor and the external heat insulation ring 1, making assembly convenient and requiring no other tooling.

[0043] 2. Improve sealing effect; after the positioning boss 12 and the positioning groove 51 are assembled, they form a structure similar to a labyrinth seal, which increases the sealing method and prevents media leakage.

[0044] 3. Reduce seal damage; specifically, further reduce damage to the sealing gasket 6; because the positioning boss 12 and the positioning groove 51 are mutually constrained (mutually pulled) after assembly, that is, if the deformation of the pump body 5 and the external heat insulation ring 1 differs greatly, the two will be constrained to make the deformation difference smaller, thereby further reducing the wear on the sealing gasket 6; and when the medium temperature fluctuates, this constraint can also make the pump body 5 and the external heat insulation ring 1 almost the same, thereby reducing the rubbing of the sealing gasket 6 and ensuring the sealing effect of the sealing gasket 6; similarly, the stator 3 of the motor and the external heat insulation ring 1 are also like this.

[0045] In one feasible implementation, the pump body 5 and the stator 3 of the motor are connected by bolts. By connecting the bolts, the external heat insulation ring 1 is pressed between the pump body 5 and the stator 3, thereby realizing the installation of the heat insulation mechanism. It can be seen that the heat insulation mechanism does not require special welding or other assembly methods, nor does it require special structural processing of the existing canned pump for assembly. It can be directly assembled on the existing canned pump. This effect is due to the structural design of the heat insulation mechanism.

[0046] Furthermore, multiple bolts are arranged circumferentially along the axis of the pump body 5 and / or the stator 3 of the motor and / or the external heat insulation ring 1; in fact, the axes of the pump body 5, the stator 3 of the motor and the external heat insulation ring 1 are collinear, and multiple bolts are arranged circumferentially along this collinear axis to ensure that the force of the bolts is evenly distributed.

[0047] Example 3

[0048] Based on any one of the implementation methods in Examples 1-2, further specific implementation methods that can be implemented are proposed.

[0049] In one feasible implementation, the outer heat insulation ring 1 has an outer concave cavity 11. The outer concave cavity 11 makes the axial dimension of the outer concave cavity 11 the largest, thus making it the most difficult for heat to pass through the outer concave cavity 11, resulting in better heat insulation effect. Furthermore, there are no other structures at the bottom of the outer concave cavity 11 as a reinforcing structure, making it easier to generate bending deformation. This makes it easier to adapt to the difference in axial deformation and radial deformation caused by the temperature difference at both ends of the outer heat insulation ring, and prevents brittle fracture.

[0050] In one feasible implementation, the internal heat insulation ring 2 has multiple concave cavities 21, which are arranged along the axis of the internal heat insulation ring 2 to achieve multi-stage heat insulation.

[0051] In one feasible implementation, the axis of the inner heat insulation ring 2 is collinear with the axis of the outer heat insulation ring 1 to ensure uniform heating, thereby making the thermal stress evenly distributed circumferentially. This reduces the impact of thermal stress on the inner heat insulation ring 2 and the outer heat insulation ring 1, such as the possibility of damage to the connection between the two, and the unevenness of deformation caused by thermal stress.

[0052] Example 4

[0053] Based on any one of the implementation methods in Examples 1-3, further specific implementation methods that can be implemented are proposed.

[0054] In one feasible implementation, the canned motor pump further includes a shielding sleeve 7 for sealing and isolating the stator 3 and the rotor 4. The shielding sleeve 7 is actually an inherent structure of the motor, isolating the stator 3 and the rotor 4 to prevent the medium from leaking to the stator 3. A heat insulation sealing mechanism is added. To ensure this effect, the end of the shielding sleeve 7 is fixedly connected to the inner wall of the outer heat insulation ring 1 to prevent the medium from leaking from the end of the shielding sleeve 7 (the connection between the shielding sleeve 7 and the outer heat insulation ring 1).

[0055] In one feasible implementation, the material used to prepare the end of the external heat insulation ring 1 that is in contact with the pump body 5 is the same as the material used to prepare the pump body 5; the material used to prepare the end of the external heat insulation ring 1 that is in contact with the stator 3 is the same as the material used to prepare the stator 3, so as to make the deformation of the end of the external heat insulation ring 1 that is in contact with the pump body 5 as similar as possible, thereby ensuring the sealing effect of the sealing gasket 6 between the pump body 5 and the external heat insulation ring 1; similarly, the sealing effect of the sealing gasket 6 between the stator 3 and the external heat insulation ring 1 is also ensured.

[0056] Example 5

[0057] A method for heat insulation and sealing of a canned motor pump, using a canned motor pump with superior heat insulation and sealing effect described in any one of the embodiments 1-4, includes heat insulation and sealing; wherein:

[0058] Thermal insulation is divided into external thermal insulation and internal thermal insulation;

[0059] External heat insulation: By utilizing the concave cavity 11 of the external heat insulation ring 1, the distance between the pump body 5 and the motor is increased, the heat transfer distance between the pump body 5 and the motor is increased, and at the same time, when the heat is transferred between the pump body 5 and the motor through the external heat insulation ring 1, it needs to pass through the air, which reduces the thermal conductivity between the high temperature medium and the low temperature medium. The reduced thermal conductivity achieves external heat insulation between the pump body 5 and the motor.

[0060] Internal insulation: The internal insulation ring 2 fills the cross-section of the medium convection between the pump body 5 and the motor, and the internal insulation ring 2 is fitted with the rotor 4 with a gap to reduce the medium convection between the pump body 5 and the motor, thus reducing the convective heat transfer between the high-temperature medium and the low-temperature medium; at the same time, the inner cavity 21 is filled with the medium, and when the pump body 5 and the motor transfer heat through the internal insulation ring 2, the medium needs to pass through the inner cavity 21 step by step, thus reducing the thermal conductivity between the high-temperature medium and the low-temperature medium; the reduction of convective heat transfer and thermal conductivity achieves internal insulation between the pump body 5 and the motor.

[0061] Sealing: Due to the presence of heat insulation, compared to the direct contact between the pump body 5 and the motor, the temperature difference between the two ends of the sealing gasket 6 is smaller. The deformation of the pump body 5 and the external heat insulation ring 1, and the deformation of the stator 3 and the external heat insulation ring 1 at both ends of the sealing gasket 6 are smaller, and the radial tension on the sealing gasket 6 is smaller. Furthermore, when the temperature of the medium fluctuates, the temperature at both ends of the external heat insulation ring 1 will fluctuate in the same way. The deformation at both ends of the external heat insulation ring 1 is the same as the deformation of the pump body 5 and the stator 1, respectively. The sealing gasket 6 at the corresponding positions will not be rubbed. The possibility of the sealing gasket 6 being damaged is reduced, and the sealing effect is maintained for a longer period of time.

[0062] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A shielded pump with superior heat insulation and sealing effect, comprising a pump body (5) and a motor, characterized in that: The pump body (5) and the motor are coaxially fitted with a heat insulation sealing mechanism, which includes an outer heat insulation ring (1) and an inner heat insulation ring (2). The outer heat insulation ring (1) has at least one concave and annular outer cavity (11); the inner heat insulation ring (2) has at least one concave and annular inner cavity (21); the inner heat insulation ring (2) is parallel to the axis of the outer heat insulation ring (1), and the notch on the inner heat insulation ring (2) is fixed to the inner wall of the outer heat insulation ring (1). The inner wall of the outer heat insulation ring (1) does not seal the notch of the inner heat insulation ring (2); the rotor (4) of the motor passes through the annular hole of the inner heat insulation ring and is clearance-fitted with the annular hole; a sealing gasket (6) is provided between the pump body (5) and the outer heat insulation ring (1), and between the stator (3) of the motor and the outer heat insulation ring (1). The sealing gasket (6) is subjected to compressive force.

2. The canned pump according to claim 1, characterized in that: The outer heat insulation ring (1) has annular positioning bosses (12) at both ends. The axis of the positioning bosses (12) is collinear with the axis of the outer heat insulation ring (1). Annular positioning grooves (51) are provided at corresponding positions on the pump body (5) and the stator (3). The shape and size of the positioning grooves (51) match the positioning bosses (12). The sealing gasket (6) is located in the positioning grooves (51).

3. The canned pump according to claim 1, characterized in that: The pump body (5) and the stator (3) of the motor are connected by multiple bolts, and the external heat insulation ring (1) is pressed between the pump body (5) and the stator (3).

4. The shielded pump according to claim 3, characterized in that: Multiple bolts are arranged circumferentially along the axis of the pump body (5) and / or the stator (3) of the motor and / or the external heat insulation ring (1).

5. The canned pump according to claim 1, characterized in that: The external heat insulation ring (1) has an external concave cavity (11).

6. The canned pump according to claim 1, characterized in that: The internal heat insulation ring (2) has multiple concave cavities (21) arranged along the axis of the internal heat insulation ring (2).

7. The canned pump according to claim 1, characterized in that: The axis of the inner heat insulation ring (2) is collinear with the axis of the outer heat insulation ring (1).

8. The canned pump according to any one of claims 1-7, characterized in that: The shielded pump also includes a shielding sleeve (7) for sealing and isolating the stator (3) and the rotor (4), with the end of the shielding sleeve (7) being sealed and fixedly connected to the inner wall of the outer heat insulation ring (1).

9. The canned motor pump according to any one of claims 1-7, characterized in that: The material used to prepare the external heat insulation ring (1) that is attached to the pump body (5) is the same as the material used to prepare the pump body (5); the material used to prepare the external heat insulation ring (1) that is attached to the stator (3) is the same as the material used to prepare the stator (3).

10. A method for heat insulation and sealing of a canned motor pump, using the canned motor pump for high temperature and high pressure environments as described in any one of claims 1-9, characterized in that: Includes heat insulation and sealing; among which: Thermal insulation is divided into external thermal insulation and internal thermal insulation; External insulation: By utilizing the concave cavity (11) of the external insulation ring (1), the distance between the pump body (5) and the motor is increased, the heat transfer distance between the pump body (5) and the motor is increased, and at the same time, when the pump body (5) and the motor transfer heat through the external insulation ring (1), they need to pass through the air, the heat conduction between the high temperature medium and the low temperature medium is reduced, and the heat conduction is reduced to achieve external insulation between the pump body (5) and the motor. Internal insulation: The internal insulation ring (2) fills the cross-section of the medium convection between the pump body (5) and the motor, and the internal insulation ring (2) and the rotor (4) are fitted with a gap to reduce the medium convection between the pump body (5) and the motor, and the convective heat transfer between the high temperature medium and the low temperature medium is reduced; at the same time, the inner cavity (21) is filled with medium, and when the pump body (5) and the motor transfer heat through the internal insulation ring (2), they need to pass through the medium in the inner cavity (21) step by step, and the heat conduction between the high temperature medium and the low temperature medium is reduced; the reduction of convective heat transfer and heat conduction realizes the internal insulation between the pump body (5) and the motor; Sealing: Due to the presence of heat insulation, the temperature difference between the two ends of the sealing gasket (6) is smaller compared to the direct contact between the pump body (5) and the motor. The deformation of the pump body (5) and the external heat insulation ring (1) and the stator (3) and the external heat insulation ring (1) at both ends of the sealing gasket (6) is smaller, and the radial tension on the sealing gasket (6) is smaller. Furthermore, when the temperature of the medium fluctuates, the temperature at both ends of the external heat insulation ring (1) will fluctuate in the same way. The deformation at both ends of the external heat insulation ring (1) is the same as the deformation of the pump body (5) and the stator (1), respectively. The sealing gasket (6) at the corresponding position will not be rubbed. The possibility of the sealing gasket (6) being damaged is reduced, and the sealing effect is maintained for a longer time.

Images