Submersible pump with double isolation protection

Abstract

A submersible pump with double isolation protection comprises a pump cover, a machine barrel used for containing a motor, an oil cylinder shell and a pump head used for containing an impeller assembly, the pump cover is arranged at the first end of the machine barrel in a covering mode, the oil cylinder shell is arranged at the second end of the machine barrel, and a water inlet and a water outlet are formed in the pump head. The pump head cover is arranged on the oil cylinder shell, and the pump head cover and the oil cylinder shell define a containing cavity used for containing lubricating oil. The pump head is provided with the through hole which can be communicated with the containing cavity and is used for the main shaft to penetrate through, the isolation cavity which can be relatively closed is further formed in the pump head, and the main shaft connected to the motor sequentially penetrates through the containing cavity, the through hole and the isolation cavity from the interior of the machine barrel and then is in driving connection with the impeller assembly. Therefore, the through hole for the main shaft to penetrate through can form double sealing, the defect that in the prior art, due to only single-layer sealing, the sealing performance at the position is poor, and dust or fluid easily enters the submersible pump is overcome, and finally the sealing effect at the position of the through hole can be more stable. And meanwhile, the failure phenomenon caused by aging of a single sealing ring can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of water pump sealing, in particular to a submersible pump with double isolation protection. Background Art

[0002] The existing water pump mainly includes a motor, a pump body, an impeller, a mechanical seal, etc. One end of the rotor shaft is connected to the pump body, and the other end is connected to the pump cover. The rotor and the pump body are separated by a waterproof cover and a mechanical seal is installed to isolate the electronic components from the mechanical parts to prevent the electronic components from being immersed in water. This is a static mechanical seal structure design. This design will shorten the service life of the seal due to the long-term immersion of the water pump in the liquid. Over time, it will also cause failures caused by liquid leakage into the water pump housing, leading to safety hazards such as damage to electronic components and motors. At the same time, the pump generates heat when working, which accelerates the aging of the seal and reduces product performance and reliability.

[0003] Therefore, it is particularly important whether the design layout of the seal used in the submersible pump is reasonable. In view of this situation, the utility model patent with application number 202321483352.8 (publication number CN220227216 U) discloses a "submersible pump with improved sealing structure" which adopts a sealing structure with a good layout, which includes a pump cover, a barrel for placing a motor, a cylinder shell, a cylinder cover and a pump head for placing an impeller assembly connected in sequence, the pump cover is arranged on the first end of the barrel, the cylinder shell is arranged on the second end of the barrel, the cylinder cover is arranged on the cylinder shell and enclosed with the cylinder shell to form a first chamber, and the pump head is connected to the cylinder cover. By providing a bidirectional sealing structure between the barrel and the pump cover, between the barrel and the cylinder shell, and also providing a bidirectional sealing structure between the cylinder cover and the cylinder shell, and between the cylinder cover and the pump head, radial and axial bidirectional sealing can be achieved between each component with sealing requirements.

[0004] However, there is also a problem here. Since the two-way seal here only solves the sealing problem between the barrel and the pump cover, between the barrel and the cylinder shell, between the cylinder cover and the cylinder shell, and between the cylinder cover and the pump head, and the main shaft connected to the motor needs to pass through the first chamber formed by the cylinder shell and the cylinder cover for placing the lubricating oil after coming out of the barrel, it can be driven to connect to the impeller assembly arranged in the pump head. Therefore, it is necessary to specially set a through hole for the main shaft to pass through on the cylinder cover. In order to prevent fluid or dust and other contaminants from entering the first chamber from the through hole, of course, it is necessary to set a reasonable seal for sealing. In the above-mentioned prior art, only a single-channel sealing device is set for protection, which to a certain extent also leads to poor sealing here, and cannot effectively overcome the problem of sealing ring leakage. After the water pump has been running for a long time, the temperature of the motor increases due to the long-term operation, or the water pump is immersed in the liquid for a long time. The single-channel sealing device will also age and fail.

[0005] Therefore, how to provide a submersible pump that can provide double isolation protection at the through hole for the main shaft to pass through so that the sealing effect at the through hole is more stable is a problem that technical personnel in this field need to solve urgently. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a submersible pump with double isolation protection, in which a through hole for a main shaft to pass through is provided with double isolation protection so as to make the sealing effect of the through hole more stable.

[0007] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a submersible pump with double isolation protection, including a pump cover, a barrel for placing a motor, a cylinder shell and a pump head for placing an impeller assembly, the pump cover is arranged on the first end of the barrel, the cylinder shell is arranged on the second end of the barrel, the pump head is provided with a water inlet and a water outlet, the pump head cover is arranged on the cylinder shell and is surrounded by the cylinder shell to form a accommodating chamber for accommodating lubricating oil, a through hole that can be connected to the accommodating chamber is opened on the pump head, and a closed isolation chamber is also formed on the pump head, the main shaft connected to the motor passes through the accommodating chamber, the through hole and the isolation chamber from the inside of the barrel in sequence, and is driven to be connected to the impeller assembly, and the through hole is double-sealed by the spatial isolation of the isolation chamber.

[0008] In order to better form an isolation cavity on the pump head, preferably, a first cavity with an opening toward the impeller assembly is formed on the pump head, and an isolation cover is also provided at the opening of the first cavity. The isolation cover and the first cavity together form the aforementioned isolation cavity, and the isolation cover is provided with a through hole for the main shaft to pass through.

[0009] In order to enable the isolation chamber to better form a fully enclosed sealing structure, preferably, a first sealing member capable of closing the isolation chamber is provided at the connection between the isolation cover and the first cavity, and a second sealing member for sealing the through hole to close the isolation chamber is embedded in the first cavity of the pump head.

[0010] In order to optimize the matching structure between the first seal and the first cavity so that a closed structure can be better formed between the first seal and the first cavity, preferably, the outer edge of the isolation cover is also provided with a curling edge facing the first cavity, and the curling edge is arranged around the outer peripheral side of the first cavity. The cross-section of the first seal is L-shaped and is covered on the outer side of the curling edge to form a closure between the isolation cover and the first cavity.

[0011] In order to optimize the matching structure between the second seal and the pump head so that a closed structure can be better formed between the second seal and the through hole of the pump head, preferably, a mounting groove for the installation of the second seal and passing through the through hole is also formed on the pump head, and an annular sleeve is also axially provided on the isolation cover and is built into the isolation cavity for the main shaft to pass through. The outer circumferential surface of the second seal is embedded in the groove wall of the mounting groove, and the inner circumferential surface of the second seal is sleeved on the outer circumferential wall of the annular sleeve to close the through hole.

[0012] In order to save manufacturing costs, preferably, the isolation cover and the ring sleeve are formed in one piece, and the inner hole of the ring sleeve forms the aforementioned through hole.

[0013] In order to better form a accommodating chamber between the pump head and the cylinder shell, preferably, the pump head is also provided with a second cavity arranged opposite to the first cavity, the through hole penetrates the first cavity and the second cavity, and a third cavity that can adapt to the second cavity is formed on the cylinder shell, and the second cavity and the third cavity together form the aforementioned accommodating chamber.

[0014] In order to optimize the overall structure of the pump head so that it can better install the impeller assembly, preferably, the pump head is also formed with an active cavity for the rotation of the impeller assembly, the water inlet and the water outlet are both connected to the active cavity, and the active cavity and the isolation cavity are separated from each other by the isolation cover.

[0015] Compared with the prior art, the advantages of the utility model are: by arranging a through hole that can be connected to the accommodating chamber and is used for the main shaft to pass through on the pump head, a relatively closed isolation chamber is also formed on the pump head, and the main shaft connected to the motor passes through the accommodating chamber, the through hole and the isolation chamber in sequence from the inside of the barrel before being driven to connect to the impeller assembly, and the spatial isolation of the isolation chamber can make the through hole for the main shaft to pass through form a double seal, even if dust or fluid breaks through the first seal, it will only enter the isolation chamber first and will not directly enter the through hole, thereby solving the problem in the prior art that the sealing performance here is poor due to only a single-layer seal, which makes it easy for dust or fluid to enter the inside of the submersible pump, and finally the sealing effect at the through hole can be made more stable, and at the same time, the failure phenomenon caused by aging of the single-channel sealing ring can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural diagram of this embodiment;

[0017] Figure 2 is a cross-sectional schematic diagram of this embodiment;

[0018] Figure 3 for Figure 2 The enlarged view of part A shown in ;

[0019] Figure 4 Schematic diagram of the three-dimensional structure of the pump head in this embodiment;

[0020] Figure 5 This is a schematic diagram of the three-dimensional structure of the pump head in this embodiment from another angle;

[0021] Figure 6 is a schematic cross-sectional structural diagram of the first sealing member in this embodiment;

[0022] Figure 7 Schematic diagram of the three-dimensional structure of the isolation cover in this embodiment. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] Figures 1 to 7 What is shown is a schematic diagram of this embodiment. The submersible pump with double isolation protection in this embodiment includes a pump cover 1, a barrel 2, a cylinder shell 3, an impeller assembly 4, a pump head 5 and an isolation cover 6b.

[0025] refer to Figures 1 to 3As shown, the pump cover 1 is arranged on the first end of the barrel 2, the cylinder shell 3 is arranged on the second end of the barrel 2, the pump head 5 is provided with a water inlet 5a and a water outlet 5b, the pump head 5 cover is arranged on the cylinder shell 3 and is surrounded by the cylinder shell 3 to form a accommodating chamber 3a for accommodating lubricating oil, the impeller assembly 4 is arranged on the pump head 5, and the pump head 5 is provided with a through hole 5c that can be connected to the accommodating chamber 3a, and a closed isolation chamber 6 is also formed on the pump head 5. The main shaft 2b connected to the motor 2a passes through the accommodating chamber 3a, the through hole 5c and the isolation chamber 6 from the inside of the barrel 2 in sequence, and then is driven to be connected to the impeller assembly 4, and the through hole 5c is double-sealed by the spatial isolation of the isolation chamber 6.

[0026] In order to better form an isolation cavity on the pump head 5, refer to Figure 2 and Figure 3 As shown, in this embodiment, a first cavity 6a opening toward the impeller assembly 4 is formed on the pump head 5, and an isolation cover 6b is also provided at the opening of the first cavity 6a. The isolation cover 6b and the first cavity 6a together form an isolation cavity 6, and the isolation cover 6b is provided with a through hole 6b1 for the main shaft 2b to pass through.

[0027] Secondly, in order to make the isolation cavity 6 form a fully enclosed sealing structure, refer to Figure 2 and Figure 3 As shown, in this embodiment, a first sealing member 6c capable of closing the isolation chamber 6 is provided at the connection between the isolation cover 6b and the first cavity 6a, and a second sealing member 6d for sealing the through hole 5c to close the isolation chamber 6 is embedded in the first cavity 6a of the pump head 5.

[0028] In addition, in order to optimize the matching structure between the first sealing member 6c and the first cavity 6a, so that the first sealing member 6c and the first cavity 6c can better form a closed structure, refer to Figures 3 to 7 As shown, in this embodiment, the outer edge of the isolation cover 6b is also provided with a curling edge 6b2 facing the first cavity 6a, and the curling edge 6b2 is arranged around the outer peripheral side of the first cavity 6a. The cross-section of the first sealing member 6c is L-shaped and is wrapped around the outer side of the curling edge 6b2 to form a seal between the isolation cover 6b and the first cavity 6a.

[0029] In addition, in order to optimize the matching structure between the second sealing member 6d and the pump head 5 so that a closed structure can be better formed between the second sealing member 6d and the through hole 5c of the pump head 5, refer to Figures 3 to 7 As shown, in this embodiment, a mounting groove 5d for mounting a second sealing member 6d and penetrating the through hole 5c is further formed on the pump head 5, and a ring sleeve 6b3 is also axially provided on the isolation cover 6b and is built into the isolation cavity 6 for the main shaft 2b to pass through. The outer peripheral surface of the second sealing member 6d is embedded in the groove wall of the mounting groove 5d, and the inner peripheral surface of the second sealing member 6d is sleeved on the outer peripheral wall of the ring sleeve 6b3 to close the through hole 5c.

[0030] At the same time, in order to save production costs, refer to Figure 7 As shown, in this embodiment, the isolation cover 6b and the ring sleeve 6b3 are made by integral molding, and the inner hole of the ring sleeve 6b3 forms a through hole 6b1. Of course, the isolation cover 6b and the ring sleeve 6b3 can also be made separately and then spliced ​​together.

[0031] In this embodiment, in order to better form the accommodating chamber 3a between the pump head 5 and the cylinder housing 3, Figure 2 and 4 As shown, in this embodiment, the pump head 5 is further provided with a second cavity 5e arranged opposite to the first cavity 6a, the through hole 5c penetrates the first cavity 6a and the second cavity 5e, and the cylinder housing 3 is formed with a third cavity 3b that can adapt to the second cavity 5e, and the second cavity 5e and the third cavity 3b together form a accommodating chamber 3a.

[0032] In this embodiment, in order to optimize the overall structure of the pump head 5 so that it can better install the impeller assembly 4, refer to Figure 2 and Figure 5 As shown, the pump head 5 in this embodiment is also formed with an active cavity 5f for the impeller assembly 4 to rotate, the water inlet 5a and the water outlet 5b are both connected to the active cavity 5f, and the active cavity 5f and the isolation cavity 6 are separated from each other by an isolation cover 6b.

[0033] It is necessary to explain additionally here that in the present embodiment, by providing a through hole 5c on the pump head 5 which can be connected to the accommodating chamber 3a and is used for the main shaft 2b to pass through, a relatively closed isolation chamber 6 is also formed on the pump head 5, and the main shaft 2b connected to the motor 2a passes through the accommodating chamber 3a, the through hole 5c and the isolation chamber 6 from the inside of the barrel 2 in sequence before being driven to connect to the impeller assembly 4, and the through hole 5c for the main shaft 2b to pass through can be formed with a double seal through the spatial isolation of the isolation chamber 6, even if dust or fluid breaks through the first seal, it will only enter the isolation chamber 6 first and will not directly enter the through hole, thereby solving the problem in the prior art that the sealing performance here is poor due to only a single-layer seal, which makes it easy for dust or fluid to enter the interior of the submersible pump, and ultimately the sealing effect at the through hole 5c can be made more stable, and at the same time, the failure phenomenon caused by aging of the single-channel sealing ring can be avoided.

[0034] It should be noted that in the description of this embodiment, the terms "front, back", "left, right", "inside, outside", "upper, lower" and the like indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. The terms "install", "connect", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A submersible pump with double isolation protection, comprising a pump cover (1), a barrel (2) for accommodating a motor (2a), a cylinder shell (3) and a pump head (5) for accommodating an impeller assembly (4), wherein the pump cover (1) is arranged on a first end of the barrel (2), the cylinder shell (3) is arranged on a second end of the barrel (2), and the pump head (5) is provided with a water inlet (5a) and a water outlet (5b), characterized in that: The pump head (5) is covered on the oil cylinder shell (3) and is enclosed with the oil cylinder shell (3) to form a receiving chamber (3a) for receiving lubricating oil. The pump head (5) is provided with a through hole (5c) that can communicate with the receiving chamber (3a), and the pump head (5) is also formed with a closed isolation chamber (6). The main shaft (2b) connected to the motor (2a) passes through the receiving chamber (3a), the through hole (5c) and the isolation chamber (6) from the inside of the barrel (2) in sequence and is then driven to connect to the impeller assembly (4). The through hole (5c) is double-sealed by the spatial isolation of the isolation chamber (6).

2. The submersible pump with double isolation protection according to claim 1, characterized in that: The pump head (5) is formed with a first cavity (6a) whose opening faces the impeller assembly (4); an isolation cover (6b) is also provided at the opening of the first cavity (6a); the isolation cover (6b) and the first cavity (6a) together form the aforementioned isolation cavity (6); the isolation cover (6b) is provided with a through hole (6b1) for the main shaft (2b) to pass through.

3. The submersible pump with double isolation protection according to claim 2 is characterized in that: A first sealing member (6c) capable of sealing the isolation chamber (6) is also provided at the connection between the isolation cover (6b) and the first cavity (6a), and a second sealing member (6d) for sealing the through hole (5c) and sealing the isolation chamber (6) is also embedded in the first cavity (6a) of the pump head (5).

4. The submersible pump with double isolation protection according to claim 3 is characterized in that: The outer edge of the isolation cover (6b) is also provided with a curling edge (6b2) facing the first cavity (6a), and the curling edge (6b2) is arranged around the outer peripheral side of the first cavity (6a). The cross section of the first sealing member (6c) is L-shaped and covers the outer side of the curling edge (6b2) to form a seal between the isolation cover (6b) and the first cavity (6a).

5. The submersible pump with double isolation protection according to claim 3 is characterized in that: The pump head (5) is also provided with a mounting groove (5d) for mounting the second sealing member (6d) and penetrating the through hole (5c); the isolation cover (6b) is also provided with a ring sleeve (6b3) along the axial direction and built into the isolation cavity (6) for the main shaft (2b) to pass through; the outer peripheral surface of the second sealing member (6d) is embedded in the groove wall of the mounting groove (5d); the inner peripheral surface of the second sealing member (6d) is sleeved on the outer peripheral wall of the ring sleeve (6b3) to close the through hole (5c).

6. The submersible pump with double isolation protection according to claim 5, characterized in that: The isolation cover (6b) and the ring sleeve (6b3) are formed in one piece, and the inner hole of the ring sleeve (6b3) forms the aforementioned through hole (6b1).

7. The submersible pump with double isolation protection according to claim 2, characterized in that: The pump head (5) is also provided with a second cavity (5e) arranged opposite to the first cavity (6a); the through hole (5c) penetrates the first cavity (6a) and the second cavity (5e); the cylinder housing (3) is formed with a third cavity (3b) that can fit the second cavity (5e); the second cavity (5e) and the third cavity (3b) together form the aforementioned accommodating chamber (3a).

8. The submersible pump with double isolation protection according to claim 2, characterized in that: The pump head (5) is also formed with an active cavity (5f) for the impeller assembly (4) to rotate, the water inlet (5a) and the water outlet (5b) both pass through the active cavity (5f), and the active cavity (5f) and the isolation cavity (6) are separated from each other by the isolation cover (6b).

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