A heat shield for a canned pump, a production process thereof and a canned pump unit

Abstract

The application discloses a heat insulation plate for a canned pump, a production process thereof and a canned pump unit, and belongs to the canned pump field. The canned pump unit comprises a control box, a pump body and the heat insulation plate. The heat insulation plate is installed between a box seat bottom plate of the control box and a machine shell of the pump body. A grounding spring plate is integrally injection molded in the heat insulation plate. The grounding spring plate has a first connecting end and a second connecting end. A first grounding fastener passes through the first connecting end and is fastened and connected with the machine shell. A second grounding fastener passes through the box seat bottom plate and is fastened and connected with the second connecting end. The heat insulation plate is integrally designed with the grounding protection. On the basis of blocking heat transfer by the heat insulation plate, the grounding protection of the pump unit is realized. Electricity is introduced into the ground, and the machine shell is prevented from electric leakage. The sealing property of the control box is improved, external air is prevented from entering the control box, condensate water is prevented from being generated, and long-term safe application of the control box is ensured.

Description

Technical Field

[0001] This invention relates to the field of pump unit technology, and more specifically, to a heat insulation plate for a shielded pump, its manufacturing process, and a shielded pump unit. Background Technology

[0002] In hot and cold water circulation systems, canned motor pumps play a crucial role as power units. A typical pump unit includes a pump body, a motor that drives the impeller assembly within the pump body, and a control box mounted on the pump body. The control box contains a controller that manages the motor's operation, thereby controlling the entire pump unit. To achieve dual-use (hot and cold) operation with the canned motor pump, not only must grounding protection be ensured, but effective prevention of condensation within the control box is also necessary.

[0003] In practice, it's common to connect the grounding wire inside the control box to the metal motor housing for grounding protection. However, this can easily lead to a connection between the control box's interior and the outside. When the canned pump delivers cold water, the temperature is lower than the ambient temperature, causing condensation to form inside the control box and potentially even causing the machine to burn out. Effectively preventing condensation is crucial for improving the long-term safety of the control box.

[0004] A search revealed that patent CN217107466U discloses a canned motor pump. Addressing the issue of water droplets condensing on the outside of the shielding sleeve and causing motor burnout, it encapsulates the grounding housing and stator assembly within a plastic housing, eliminating exposed metal parts and preventing water droplets from condensing on the side of the shielding sleeve facing the stator assembly, thus significantly reducing the likelihood of motor burnout. Furthermore, the grounding housing facilitates grounding connection, improving safety. However, this design is relatively complex and difficult to adapt to various pump structures, limiting its application. Summary of the Invention

[0005] 1. The technical problem that the invention aims to solve

[0006] In view of the safety risks caused by condensation in the control box of a canned pump in the prior art, the present invention aims to provide a heat insulation plate for a canned pump, its manufacturing process and a canned pump unit. By adopting the heat insulation plate structure of the present invention, while achieving grounding protection, it can effectively prevent the generation of condensation in the control box and improve the safety of pump use.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0009] The present invention provides a heat insulation plate for a shielded pump, which is configured to be installed between the base plate of the control box and the housing of the pump body to block heat transfer between the pump body and the control box.

[0010] The heat insulation board has an integrally injection-molded grounding spring with a first connecting end and a second connecting end. The area on the heat insulation board corresponding to the first connecting end is provided with a housing mounting position for connecting with the housing of the pump body, thereby enabling the first connecting end to be electrically connected to the housing. The area on the heat insulation board corresponding to the second connecting end is provided with a box mounting position for connecting with the box base plate of the control box, thereby enabling the second connecting end to be electrically connected to the control box.

[0011] Furthermore, the area on the heat insulation plate corresponding to the first connecting end is formed with a housing mounting hole that extends through the thickness. The first connecting end extends into the housing mounting hole and is provided with a first connecting hole corresponding to the position of the housing mounting hole. The housing mounting hole and the first connecting hole cooperate to allow the first grounding fastener to pass through and connect to the housing.

[0012] Furthermore, a grounding insert is provided on the second connection end, and a second connection hole is provided in the grounding insert. The second connection hole extends upward to the surface of the heat insulation plate, so that the second grounding fastener can pass through the bottom plate of the box base and cooperate with the second connection hole to be fastened.

[0013] Furthermore, a housing mounting post is formed in the area of ​​the heat insulation plate corresponding to the second connection end, and a grounding insert extends in the housing mounting post, with a sealing element circumferentially surrounding the top of the grounding insert inside the housing mounting post.

[0014] The present invention also provides a shielded pump unit, including a control box, a pump body and a heat insulation plate. The heat insulation plate is installed between the base plate of the control box and the housing of the pump body. The heat insulation plate is as described above. A first grounding fastener extends out of the first connection end and is fastened to the housing. A second grounding fastener extends out of the base plate and is fastened to the second connection end.

[0015] Furthermore, the first grounding fastener is not connected to the inner cavity of the housing; after the second grounding fastener passes through the bottom plate of the housing, a sealing element is provided around the second grounding fastener between the bottom plate of the housing and the heat insulation plate.

[0016] Furthermore, a grounding mounting post is provided in the area corresponding to the first connection end of the housing. The grounding mounting post has a threaded hole, which is a blind hole. The first grounding fastener passes through the first connection end and is threadedly engaged with the grounding mounting post for fastening.

[0017] Furthermore, a grounding insert is provided on the second connection end, and a second connection hole is provided in the grounding insert. A heat insulation mounting hole with a through thickness is provided in the area corresponding to the second connection hole on the bottom plate of the box base. The second grounding fastener passes through the heat insulation mounting hole and is threadedly fastened to the second connection hole.

[0018] Furthermore, a box mounting post is formed in the area corresponding to the second connection end on the heat insulation plate, and the grounding insert extends in the box mounting post. A sealing element is provided around the top of the grounding insert in the box mounting post. An outwardly protruding mounting flange is provided around the edge of the heat insulation mounting hole on the box base plate. The mounting flange is pressed against the sealing element.

[0019] Furthermore, the grounding spring includes a spring body, with a first connecting end and a second connecting end at both ends; both the first connecting end and the second connecting end extend horizontally inside the heat insulation plate, and the first connecting end and the second connecting end are at different horizontal heights.

[0020] Furthermore, the grounding insert is riveted to the second connection end and is integrally injection molded with the heat insulation plate, and a recessed portion is provided around the center of the outer wall of the grounding insert in the circumferential direction.

[0021] Furthermore, the heat insulation board is integrally injection molded with a cable outlet adapter assembly, the two ends of which extend to the upper and lower sides of the heat insulation board respectively; one end of the cable outlet adapter assembly passes through the control box and is electrically connected to the circuit board, and the other end passes through the housing and is electrically connected to the stator assembly. Sealing elements are provided around the outer periphery of the cable outlet adapter assembly on the upper and lower sides of the heat insulation board respectively. A ring of outward protruding flanges is provided on the bottom plate of the box base and the housing corresponding to the installation area of ​​the cable outlet adapter assembly to press the sealing elements for sealing.

[0022] This invention also provides a manufacturing process for a heat insulation plate for a shielded pump. Using the heat insulation plate as described above, the grounding spring is placed into the injection mold for positioning and injection molding is started, so that the grounding spring is integrally formed and hidden inside the heat insulation plate. The first connecting end and the second connecting end of the grounding spring can be connected to the outside for installation and fastening.

[0023] Furthermore, the heat insulation board also has a wire outlet adapter assembly. During processing, the wire outlet adapter element is first placed into the injection mold for positioning and the first injection molding is performed. The outer periphery of the wire outlet adapter element is covered with a molded shell to form the wire outlet adapter assembly. Then, the wire outlet adapter assembly and the grounding spring are placed into the injection mold for positioning and the second injection molding begins, so that the wire outlet adapter assembly and the grounding spring are integrally formed inside the heat insulation board.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0026] The shielded pump unit of this invention integrates grounding protection with the heat insulation board. While utilizing the heat insulation board to block heat transfer, a grounding spring is integrally injection-molded within the heat insulation board. Metal fasteners connect the two ends of the grounding spring to the control box and the housing, respectively, enabling metal-to-metal conductivity between the control box and the housing. This provides grounding protection for the pump unit, conducting electricity to the ground and preventing leakage from the housing. Furthermore, the grounding location can be freely selected, offering strong applicability and flexibility. The concealed design of the grounding spring enhances protection and ensures grounding reliability. Secondly, a sealing element is installed between the heat insulation board and the control box to maintain a seal. The heat insulation board is not connected to the housing's internal cavity during installation, effectively ensuring the control box's airtightness and preventing outside air from entering, thus avoiding condensation and ensuring the long-term safe operation of the control box. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the pump unit in the embodiment;

[0028] Figure 2 This is a schematic diagram of the pump unit from a bottom-view perspective in the embodiment;

[0029] Figure 3 This is a cross-sectional view of the pump unit in the embodiment;

[0030] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point A;

[0031] Figure 5 for Figure 4 A magnified view of the structure at point B in the middle;

[0032] Figure 6 This is a schematic diagram of the heat insulation panel in the embodiment;

[0033] Figure 7 This is a cross-sectional view of the insulation panel in the embodiment;

[0034] Figure 8 This is a schematic diagram of the control box base from a bottom view in the embodiment.

[0035] Figure 9 This is a schematic diagram of the motor housing structure in the embodiment;

[0036] Figure 10 This is a schematic diagram of the grounding spring in the embodiment;

[0037] Figure 11 This is a cross-sectional view of the grounding spring in the embodiment.

[0038] Explanation of the labels in the diagram:

[0039] 100. Control box; 110. Box base plate; 111. Thermal insulation mounting surface; 112. Mounting flange; 113. Second grounding fastener;

[0040] 200. Pump body; 210. Housing; 211. Grounding mounting post; 212. Housing mounting post; 213. Adapter flange; 214. First grounding fastener;

[0041] 300. Insulation board; 301. Sealing element; 302. Outgoing cable adapter assembly; 310. Board body; 311. Box mounting post; 312. Housing mounting hole;

[0042] 400, Grounding spring; 401, Spring body; 402, First connecting end; 403, First connecting hole; 404, Bending part; 405, Second connecting end; 410, Grounding insert; 411, Second connecting hole; 412, Recessed part. Detailed Implementation

[0043] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] The present invention will be further described below with reference to embodiments.

[0046] Example

[0047] Combination Figures 1-11 As shown, this embodiment provides a shielded pump unit, including a control box 100, a pump body 200, and a heat insulation plate 300. The heat insulation plate 300 is installed between the base plate 110 of the control box 100 and the housing 210 of the pump body 200. The control box 100 houses a controller circuit board. Both the control box 100 and the housing 210 of the pump body 200 are made of metal to enable electrical conductivity. The heat insulation plate 300 is integrally injection molded from plastic. The heat insulation plate 300, placed between the base plate 110 and the housing 210, effectively blocks heat transfer between the pump body 200 and the control box 100, thereby preventing the control box 100 from being affected by high temperatures and ensuring the safe operation of the control box 100.

[0048] In this embodiment, the grounding protection and the heat insulation plate 300 are designed as an integrated unit. Specifically, the heat insulation plate 300 includes a plate body 310, and a grounding spring 400, specifically a thin metal spring, is integrally injection molded inside the plate body 310. The grounding spring 400 has a first connecting end 402 and a second connecting end 405. A housing mounting position is provided on the plate body 310 in the area corresponding to the first connecting end 402. The housing mounting position is used to connect with the housing 210 of the pump body 200, thereby enabling the first connecting end 402 to be electrically connected to the housing 210. A box mounting position is provided on the plate body 310 in the area corresponding to the second connecting end 405. The box mounting position is used to connect with the box base plate 110 of the control box 100, thereby enabling the second connecting end 405 to be electrically connected to the control box 100.

[0049] Specifically, when installing the heat insulation board 300, the first grounding fastener 214 extends out of the first connecting end 402 and is securely connected to the housing 210, and the second grounding fastener 113 extends out of the base plate 110 and is securely connected to the second connecting end 405. Both the first grounding fastener 214 and the second grounding fastener 113 are metal connecting fasteners. The first grounding fastener 214 and the first connecting end 402, as well as the first grounding fastener 214 and the housing 210, are in close contact to achieve electrical conduction. Similarly, the second grounding fastener 113 and the base plate 110, as well as the second grounding fastener 113 and the second connecting end 405, are in close contact to achieve electrical conduction. In this embodiment, the grounding wire of the controller circuit board inside the control box 100 is first made in contact with the metal body of the control box 100 to achieve electrical conductivity. Specifically, a metal spring is embedded inside the control box 100, connecting the grounding wire to the metal control box 100. Then, electrical conductivity is achieved sequentially through the metal base plate 110, the second grounding fastener 113, the second connection terminal 405, the grounding spring 400, the first connection terminal 402, the first grounding fastener 214, and the housing 210, thereby achieving grounding protection for the pump unit, conducting electricity to the ground, and preventing leakage in the housing 210. This approach does not impose strict restrictions on the grounding position of the controller circuit board inside the control box 100, allowing for free selection of the grounding position, offering strong applicability and flexibility, and making it very convenient to use.

[0050] In this embodiment, the grounding spring 400 is integrally molded and hidden inside the heat insulation plate 300. This design features a simple structure, stable position, and good protection, ensuring reliable and effective grounding. Furthermore, the heat insulation plate 300, being an injection-molded part, effectively blocks heat transfer, allowing for tight installation on both sides of the housing 210 and the base plate 110. Specifically, the heat insulation plate 300 is pressed firmly against the base plate 110. The outer surface of the base plate 110 has a heat-insulating mounting surface 111, on which the heat insulation plate 300 is fitted and installed. Although the second grounding fastener 113 passes through the base plate 110 of the box seat, it does not penetrate the heat insulation plate 300. Instead, it is connected to the grounding spring 400 hidden inside the heat insulation plate 300. The housing 210 is not directly connected to the inside of the control box 100. Instead, it is connected to the grounding spring 400 hidden inside the heat insulation plate 300 using the first grounding fastener 214. Compared with traditional technology, this helps to reduce the large amount of outside air entering the control box 100, thereby alleviating the condensation problem and ensuring the application safety of the control box 100.

[0051] To further enhance the safety of the control box 100, the design is optimized so that the first grounding fastener 214 is not connected to the inner cavity of the housing 210, thus preventing the inner cavity of the housing 210 from communicating with the outside. After the second grounding fastener 113 protrudes from the bottom plate 110 of the box base, a sealing element 301 is provided around the second grounding fastener 113 between the bottom plate 110 of the box base and the heat insulation plate 300, thereby further improving the sealing performance between the control box 100 and the outside, especially preventing air from entering the control box 100 from the protrusion area of ​​the second grounding fastener 113.

[0052] As one of the feasible installation methods for the casing mounting position in practice, combined with Figures 4-7 As shown, the heat insulation plate 300 has a housing mounting hole 312 with a through thickness formed in the area corresponding to the first connecting end 402. The first connecting end 402 extends into the housing mounting hole 312 and is provided with a first connecting hole 403 corresponding to the position of the housing mounting hole 312. The housing mounting hole 312 and the first connecting hole 403 are used to allow the first grounding fastener 214 to pass through and connect to the housing 210. Preferably, the diameter of the housing mounting hole 312 is significantly larger than the diameter of the first connecting hole 403, so that the first connecting end 402 and the first connecting hole 403 can be basically completely exposed in the housing mounting hole 312, avoiding flash or other issues that may affect the grounding reliability during the injection molding process. More specifically, the first grounding fastener 214 can be a fastening bolt. The housing 210 is provided with a grounding mounting post 211 in the area corresponding to the first connecting end 402. The grounding mounting post 211 is provided with a threaded hole. The first grounding fastener 214 penetrates the heat insulation plate 300 from top to bottom and is threadedly fastened to the grounding mounting post 211. The first grounding fastener 214 presses the first connecting end 402 and the housing 210 to achieve electrical conduction.

[0053] As one of the feasible installation methods for the box mount in practice, combined with Figures 4-7 As shown, a metal grounding insert 410 is provided on the second connecting end 405. A second connecting hole 411 is provided in the grounding insert 410, extending upward to the surface of the heat insulation plate 300, for the second grounding fastener 113 to pass through the box base plate 110 and engage with the second connecting hole 411 for fastening. More specifically, the second grounding fastener 113 can be a fastening bolt, the second connecting hole 411 is a threaded hole, and the box base plate 110 has a heat insulation mounting hole with a thickness of penetration in the area corresponding to the second connecting hole 411. The second grounding fastener 113 passes through the heat insulation mounting hole and exits the box base plate 110, then engages with the second connecting hole 411 for fastening. This achieves the following: after the fastening bolts press the box base plate 110, they also press the grounding insert 410 downwards, thus realizing the sequential metal electrical conduction relationship between the box base plate 110 and the second grounding fastener 113, between the second grounding fastener 113 and the grounding insert 410, and between the grounding insert 410 and the grounding spring 400, thereby meeting the grounding requirements.

[0054] Furthermore, such as Figure 10 As shown, during processing, the grounding insert 410 is pre-riveted to the second connecting end 405, and then the entire grounding spring 400 is integrally injection molded with the heat insulation plate 300. The outer wall of the grounding insert 410 has a recessed portion 412 around it in the circumferential direction. This facilitates the effective positioning of the thin-sheet grounding spring 400 before injection molding. After injection molding, a ring of injection molding material is also formed on the outside of the recessed portion 412 to ensure the positional accuracy and stability of the entire grounding spring 400, including the grounding insert 410, so as to ensure the tightness of the subsequent installation and fit with the second grounding fastener 113 and ensure that it can be pressed smoothly.

[0055] Combination Figure 6 and Figure 7 As shown, further optimization is possible in practice. A mounting post 311 is formed on the area of ​​the insulation plate 300 corresponding to the second connection end 405. A grounding insert 410 extends within the mounting post 311, and a sealing element 301 is provided circumferentially around the top of the grounding insert 410 within the mounting post 311. Correspondingly, combined with... Figure 5 and Figure 8As shown, the edge of the heat insulation mounting hole on the base plate 110 of the box seat is provided with an outwardly protruding mounting flange 112. The mounting flange 112 is pressed against the sealing element 301. Thus, after the second grounding fastener 113 passes downward from the control box 100 through the heat insulation mounting hole of the base plate 110, it is threadedly tightened with the grounding insert 410. The mounting flange 112 is then pressed downward against the sealing element 301, effectively sealing the area around the heat insulation mounting hole of the base plate 110, preventing contact with outside air, and thus effectively preventing air from entering and causing condensation. In practice, the heat insulation plate 300 is integrally molded using injection molding, and the sealing element 301 can specifically be made of injection-molded soft rubber. After the hard rubber is molded, soft rubber is further injection-molded for sealing. Figure 6 As shown, to achieve a stable installation of the heat insulation plate 300 and the box base plate 110, four sets of box base mounting posts 311 can be provided on the heat insulation plate 300. One set of box base mounting posts 311 is fitted with a grounding insert 410 and a second connection end 405 to achieve grounding connection. The other three sets of box base mounting posts 311 can be fastened by passing fastening bolts through the box base plate 110 and engaging with the internal threads of the other box base mounting posts 311. Sealing elements 301 are also provided around the top of the remaining box base mounting posts 311. The box base plate 110 has a total of four sets of heat insulation mounting holes. Each set of heat insulation mounting holes is surrounded by an outwardly protruding mounting flange 112. The mounting flange 112 is pressed against the sealing element 301 of each set of box base mounting posts 311 to achieve comprehensive sealing protection for the control box 100.

[0056] Furthermore, combining Figure 4 and Figure 9 As shown, to achieve effective installation of the housing 210 and the heat insulation plate 300, a grounding mounting post 211 is provided in the area corresponding to the first connecting end 402 of the housing 210. The grounding mounting post 211 has a threaded hole, and the threaded hole is a blind hole. (Refer to...) Figure 4The first grounding fastener 214, after passing through the first connecting end 402, is threadedly fastened to the grounding mounting post 211. This securely installs the heat insulation plate 300 while preventing it from communicating with the inner cavity of the housing 210, thus avoiding heat transfer and air ingress, and further reducing condensation in the control box 100. In practice, a guide post is also provided in the area where the lower part of the heat insulation plate 300 mates with the grounding mounting post 211, allowing the grounding mounting post 211 to be embedded in the guide post and threadedly engaged with the first grounding fastener 214 during installation. To achieve stable installation, in addition to the grounding mounting post 211, the housing 210 also has multiple sets of housing mounting posts 212. Besides the area at the first connecting end 402, the heat insulation plate 300 also has multiple sets of through housing mounting holes 312, allowing fastening bolts to pass through the heat insulation plate 300 and threadedly engage with the housing mounting posts 212 for installation. The grounding mounting post 211 on the housing 210 extends at a greater height than the housing mounting post 212 to accommodate the height difference caused by the first connection end 402 being hidden inside the heat insulation plate 300.

[0057] In practice, construction can be further optimized by selecting specific locations and combining them with... Figure 10 The grounding spring 400 includes a spring body 401, with a first connecting end 402 and a second connecting end 405 at its two ends. Both the first connecting end 402 and the second connecting end 405 extend horizontally within the heat insulation plate 300 to facilitate precise engagement with the grounding fasteners, ensuring stable clamping and reliable grounding. The first connecting end 402 and the second connecting end 405 have different horizontal heights; specifically, the second connecting end 405, equipped with a grounding insert 410, is higher. The spring body 401 also extends horizontally within the heat insulation plate 300, remaining flush with the first connecting end 402. A bend 404 between the second connecting end 405 and the spring body 401 accommodates height variations. In practice, to ensure grounding reliability, the thin-plate-shaped first connecting end 402 and the second connecting end 405 require tight contact and clamping between the grounding fasteners and the first connecting end 402 and the second connecting end 405, while maintaining electrical conductivity. Especially for the second connecting end 405, the grounding insert 410 not only provides threaded holes to accommodate the tightening of the fastening bolts, but also effectively avoids the impact of flash caused by injection molding around the second connecting hole 411 on the grounding reliability of the grounding fastener. Simultaneously, by providing the bending portion 404, this embodiment satisfies the installation position requirements of the first connecting end 402 and the second connecting end 405 while effectively reducing the length of the grounding insert 410, thereby reducing the production cost of the grounding insert 410. In practice, depending on requirements, the spring body 401 and the bending portion 404 can extend freely within the heat insulation plate 300, ensuring metal communication between the first connecting end 402 and the second connecting end 405.

[0058] In this embodiment of the shielded pump unit, it should also be noted that an outlet adapter assembly 302 is integrally injection molded on the heat insulation plate 300. Both ends of the outlet adapter assembly 302 extend to the upper and lower sides of the heat insulation plate 300, respectively. One end of the outlet adapter assembly 302 passes through the control box 100 and is electrically connected to the circuit board, while the other end passes through the housing 210 and is electrically connected to the stator assembly. Sealing elements 301 are respectively provided around the outer periphery of the outlet adapter assembly 302 on the upper and lower sides of the heat insulation plate 300. A ring of outwardly protruding flanges is provided on the box base plate 110 and the housing 210 corresponding to the mounting area of ​​the outlet adapter assembly 302, combined with… Figure 8 and Figure 9 As shown, a compression seal 301 is used for sealing, with the corresponding adapter flange 213 on the housing 210. Similarly, this design further ensures a complete seal for the control box 100, preventing communication with the outside, reducing heat transfer and air ingress, and preventing condensation. The seal 301 can be injection molded from soft rubber.

[0059] This embodiment also provides the aforementioned manufacturing process for the heat insulation plate. Using the heat insulation plate 300 as described above, the grounding spring 400 is placed into the injection mold for positioning and injection molding begins, so that the grounding spring 400 is integrally formed and hidden inside the heat insulation plate 300. The first connecting end 402 and the second connecting end 405 of the grounding spring 400 can communicate with the outside for installation and fastening. Furthermore, the heat insulation plate 300 also has a wire outlet adapter assembly 302. During processing, the wire outlet adapter element is first placed into the injection mold for positioning and the first injection molding is performed. A shell is formed around the wire outlet adapter element to form the wire outlet adapter assembly 302. Then, the wire outlet adapter assembly 302 and the grounding spring 400 are placed into the injection mold for positioning and the second injection molding begins, so that the wire outlet adapter assembly 302 and the grounding spring 400 are integrally formed inside the heat insulation plate 300. This two-stage injection molding process involves first separately injection molding the outgoing wire adapter element into an outgoing wire adapter assembly 302, achieving pre-positioning and strength enhancement. This avoids the possibility of deformation or displacement due to pressure when the outgoing wire adapter element is directly injection molded inside the heat insulation plate 300. By first separately injection molding the outgoing wire adapter assembly 302, the outgoing wire adapter element is pre-positioned and the overall structure is strengthened. Then, it is integrally molded with the heat insulation plate 300 and the grounding spring 400 through a second injection molding process, ensuring the positional accuracy and reliability of the outgoing wire adapter element and the grounding spring 400.

[0060] The present invention and its embodiments have been described above illustratively. This description is not restrictive and is merely one embodiment of the present invention, and is not actually limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A heat shield for a canned motor pump, the heat shield (300) being configured to be mounted between a base plate (110) of a control box (100) and a casing (210) of a pump body (200) to block heat transfer between the pump body (200) and the control box (100), characterized in that: a grounding spring (400) is integrally injection molded in the heat shield (300), the grounding spring (400) having a first connecting end (402) and a second connecting end (405), a region of the heat shield (300) corresponding to the first connecting end (402) is provided with a casing mounting position for cooperating with the casing (210) of the pump body (200) to electrically conduct the first connecting end (402) with the casing (210), and a region of the heat shield (300) corresponding to the second connecting end (405) is provided with a base plate mounting position for cooperating with the base plate (110) of the control box (100) to electrically conduct the second connecting end (405) with the control box (100). A casing mounting hole (312) extending through the thickness of the heat shield (300) is formed in the region corresponding to the first connecting end (402), the first connecting end (402) extends into the casing mounting hole (312) and is provided with a first connecting hole (403) corresponding to the position of the casing mounting hole (312), the casing mounting hole (312) and the first connecting hole (403) cooperate to allow a first grounding fastener (214) to pass through and connect with the casing (210).

2. A thermal shield for a canned pump according to claim 1, characterized in that: The second connecting end (405) is provided with a grounding insert (410), the grounding insert (410) is provided with a second connecting hole (411) extending upward to the surface of the heat shield (300) for cooperating with a second grounding fastener (113) to fasten after passing through the base plate (110).

3. The thermal shield plate for a canned pump according to claim 1, characterized by: The region of the heat shield (300) corresponding to the second connecting end (405) is formed with a base plate mounting column (311), the grounding insert (410) extends in the base plate mounting column (311), and the base plate mounting column (311) is provided with a sealing member (301) around the top of the grounding insert (410) in the circumferential direction.

4. A thermal shield for a canned pump according to claim 3, characterised in that: The heat shield (300) of claim 1, the first grounding fastener (214) passes out of the first connecting end (402) and fastens with the casing (210), and the second grounding fastener (113) passes out of the base plate (110) and fastens with the second connecting end (405).

5. A canned pump unit comprising a control box (100), a pump body (200) and a thermal barrier (300) installed between a box base plate (110) of the control box (100) and a casing (210) of the pump body (200), characterized in that: The first grounding fastener (214) and the inner cavity of the casing (210) are not in communication with each other; after the second grounding fastener (113) passes out of the base plate (110), the base plate (110) and the heat shield (300) are provided with a sealing member (301) around the periphery of the second grounding fastener (113).

6. A canned pump assembly according to claim 5, characterised in that: ​ 7. A canned pump assembly according to claim 5, wherein: The chassis (210) is provided with a grounding mounting column (211) in the region corresponding to the first connecting end (402), the grounding mounting column (211) is internally provided with a threaded hole, the threaded hole is a blind hole, and the first grounding fastener (214) is fastened in threaded cooperation with the grounding mounting column (211) after being passed out of the first connecting end (402).

8. A canned pump assembly according to claim 5, wherein: The second connecting end (405) is provided with a grounding insert (410), the grounding insert (410) is internally provided with a second connecting hole (411), the box seat bottom plate (110) is provided with a heat insulation mounting hole penetrating the thickness in the region corresponding to the second connecting hole (411), and the second grounding fastener (113) is fastened in threaded cooperation with the second connecting hole (411) after being passed out of the heat insulation mounting hole and penetrating the box seat bottom plate (110).

9. A canned pump assembly according to claim 8, characterised in that: The region of the heat insulation plate (300) corresponding to the second connecting end (405) is formed with a box seat mounting column (311), the grounding insert (410) extends in the box seat mounting column (311) in correspondence, and the box seat mounting column (311) is internally provided with a sealing member (301) surrounding the top of the grounding insert (410) in the circumferential direction; the edge of the heat insulation mounting hole of the box seat bottom plate (110) is provided with an outwardly protruding mounting flange (112) in a surrounding manner, and the mounting flange (112) is compressed on the sealing member (301) in cooperation.

10. A canned pump assembly according to any one of claims 5 to 9, wherein: The grounding elastic sheet (400) comprises an elastic sheet main body (401), and the two ends of the elastic sheet main body (401) are respectively a first connecting end (402) and a second connecting end (405); the first connecting end (402) and the second connecting end (405) both extend horizontally inside the heat insulation plate (300), and the horizontal heights of the first connecting end (402) and the second connecting end (405) are different.

11. A canned pump assembly according to claim 8, characterized in that: The grounding insert (410) is riveted on the second connecting end (405) and integrally injection molded with the heat insulation plate (300) in a unified manner, and a ring of recessed portions (412) is circumferentially arranged on the outer wall of the grounding insert (410) in the middle portion.

12. A canned pump assembly according to any one of claims 5 to 9, characterised in that: The heat insulation plate (300) is further integrally injection molded with a wire outlet adapter assembly (302), and the two ends of the wire outlet adapter assembly (302) extend to the upper and lower sides of the heat insulation plate (300) respectively; one end of the wire outlet adapter assembly (302) penetrates into the control box (100) and is electrically connected with a circuit board, and the other end penetrates into the chassis (210) and is electrically connected with a stator assembly; the outer periphery of the wire outlet adapter assembly (302) is provided with a sealing member (301) on the upper and lower sides of the heat insulation plate (300) in a surrounding manner, and a ring of outwardly protruding flanges is arranged on the box seat bottom plate (110) and the chassis (210) in the regions corresponding to the installation of the wire outlet adapter assembly (302) to compress and seal the sealing member (301).

13. A production process of a thermal shield for a canned pump, using the thermal shield (300) according to any one of claims 1 to 4, characterized in that: The grounding elastic sheet (400) is positioned in an injection mold and then injection molding is started to integrally form the grounding elastic sheet (400) inside the heat insulation plate (300), and the first connecting end (402) and the second connecting end (405) of the grounding elastic sheet (400) can be communicated with the outside for installation and fastening.

14. The process for producing a thermal shield for a canned pump according to claim 13, characterized in that: The heat insulation plate (300) further has a wire outlet adapter assembly (302). During processing, the wire outlet adapter element is first positioned in an injection mold and subjected to first injection molding, and a shell is formed around the periphery of the wire outlet adapter element to form the wire outlet adapter assembly (302); then the wire outlet adapter assembly (302) and the grounding spring (400) are jointly positioned in the injection mold, and second injection molding is started, so that the wire outlet adapter assembly (302) and the grounding spring (400) are integrally formed inside the heat insulation plate (300).

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