Cable joint device for submersible pump

Abstract

The invention discloses a cable joint for a submersible pump, which relates to the technical field of submersible pumps and comprises a cable protection spring, a cable protection thread bushing and a water pump motor cable-passing elbow. The cable protection spring is used for a cable to penetrate through, the cable protection spring is connected to the cable protection threaded sleeve, the cable protection threaded sleeve is in threaded connection with the water pump motor cable passing elbow, and a cable sealing mechanism and a cable locking mechanism are arranged in the cable protection threaded sleeve; the water pump motor cable-passing elbow is provided with a sealing structure, one end of the water pump motor cable-passing elbow is connected to a submersible pump body, the sealing structure is installed in the water pump motor cable-passing elbow, and a cable is elastically sealed through the sealing structure. The sealing structure comprises a cable sealing plug, a sealing pore plate and an O-shaped ring, and a cable penetrates through the cable sealing plug and the sealing pore plate. Cable connection is firmer, the sealing effect is better, the water pump is safer to use, and the service life is longer.

Description

Technical Field

[0001] The invention relates to the technical field of submersible pumps, in particular to a cable connector for submersible pumps. Background Art

[0002] Submersible pump is a kind of water pump. When in use, the whole water pump is submerged in water to extract groundwater to the surface. It is often used for urban drainage, domestic water, industrial cooling, farmland irrigation, seawater lifting, fountain landscape, and fire emergency. The impeller, guide vane and motor of the submersible pump are all submerged in water to work. The submersible pump is small in size and light in weight, and has been widely used in urban drainage and agricultural irrigation. Submersible pumps are used underwater, and the cable connecting the motor must also be inserted underwater to connect the motor. The other end of the cable is connected to the power supply. When the power supply is energized, the motor rotates and the water pump works. However, the cable must pass through the opening in the motor housing to enter the housing cavity to connect to the motor. In order to prevent water from entering the motor housing cavity and the cable from falling off, we need to ensure that the cable and the connecting hole on the motor housing have a better sealing state and stability. In addition, in order to prevent the cable from excessive bending and reducing its service life or even direct damage, we need a cable protection device to fix and protect the cable.

[0003] In view of the above problems, the inventor proposes a cable connector for a submersible pump to solve the above problems. Summary of the invention

[0004] In order to solve the above problems, the object of the present invention is to provide a cable connector for a submersible pump.

[0005] In order to solve the above technical problems, the present invention adopts the following technical scheme: a cable connector for a submersible pump, comprising a submersible pump body, a cable protection spring, a cable protection threaded sleeve and a water pump motor cable elbow, wherein the cable connection end on the submersible pump body is connected with a water pump motor cable elbow, the cable protection spring is connected and arranged at one end of the water pump motor cable elbow away from the submersible pump body, the water pump motor cable elbow is provided with an internal thread, the end of the cable protection threaded sleeve is connected to the internal thread of the water pump motor cable elbow, the cable protection spring is connected to the cable protection threaded sleeve, and a cable sealing mechanism and a cable locking mechanism are provided in the cable protection threaded sleeve.

[0006] Preferably, the cable sealing mechanism comprises a water pump motor cable elbow, a cable sealing ring, a nylon washer, and a cable sealing retaining ring. The cable sealing retaining ring squeezes the cable sealing ring to produce elastic deformation, shrink inwards and fit tightly with the cable. The cable protection threaded sleeve and the fixed end of the cable protection spring are provided with a conical spiral groove, the taper pitch of which is engaged with the pitch of the cable protection spring and a fixing hole is provided at the bottom. The nylon washer separates the cable sealing rings. The outer diameter of the boss of the cable sealing retaining ring is smaller than the inner diameter of the thread of the water pump motor cable elbow. The height of the boss of the cable sealing retaining ring is smaller than the gap after the cable protection threaded sleeve and the water pump motor cable elbow are fully engaged. The distance between the top surface of the cable sealing retaining ring and the bottom surface of the inner hole of the cable protection threaded sleeve is smaller than the free height of the nylon washer and the cable sealing ring. After the cable protection threaded sleeve is fully engaged with the water pump motor cable elbow, the axial height of the nylon washer and the cable sealing ring are compressed to seal the cable.

[0007] Preferably, the cable locking mechanism comprises a water pump motor cable elbow, a cable sealing ring, a cable clamp, and a clamp sealing ring. When the threaded connection is tightened, the cable sealing ring is pushed to squeeze the cable clamp. The cable clamp and the water pump motor cable elbow are equipped with an inclined wedge. The bottom of the thread of the water pump motor cable elbow is equipped with a conical hole. The conical hole cooperates with the cable clamp to lock the cable; the cable clamp is a split structure with two semicircular inclined wedges forming a full circle for easy installation. The taper of the wedge surface is 10°-20°. There is a locking pattern inside the cable clamp, and the conical surface of the cable clamp has a sealing ring groove structure.

[0008] Preferably, the cable protection threaded sleeve and the fixed end of the cable protection spring are provided with a conical spiral groove, the taper pitch of which is engaged with the pitch of the cable protection spring and a fixing hole is provided at the bottom.

[0009] Preferably, one end of the water pump motor cable elbow is connected to the submersible pump body, and a sealing structure is installed inside the water pump motor cable elbow. The sealing structure elastically seals the cable, and the sealing structure includes a cable sealing plug, a sealing orifice plate and an O-ring. The water pump motor cable elbow and the submersible pump body respectively have step holes, and the water pump motor cable elbow has an O-ring groove. The two sealing orifice plates are respectively placed in the step hole of the water pump motor cable elbow and the step hole of the submersible pump body, the cable sealing plug is placed between the two sealing orifice plates, and the O-ring is placed in the O-ring groove of the water pump motor cable elbow. The O-ring is deformed and fits tightly with the entire inner wall.

[0010] Preferably, the stepped hole of the water pump motor cable elbow has the same axial diameter as the stepped hole of the submersible pump body, the stepped hole of the water pump motor cable elbow is provided with a contact pressure surface for contacting the sealing orifice plate, and the stepped hole of the submersible pump body is provided with a contact pressure surface for contacting the other sealing orifice plate.

[0011] Preferably, the cable sealing plug is placed between the two sealing orifice plates, and the cable sealing plug is tapered. The cable sealing plug and the two sealing orifice plates each have a hole for passing the cable, and the cable and the cable sealing plug are interference fit.

[0012] Preferably, the O-ring is placed in the O-ring groove of the water pump motor cable elbow, and when the water pump motor cable elbow is connected to the submersible pump body, the end face of the water pump motor cable elbow is combined with the end face of the submersible pump body.

[0013] Preferably, the water pump motor cable elbow is L-shaped, and one end of the water pump motor cable elbow is fixed to the submersible pump body by a countersunk screw.

[0014] Compared with the prior art, the present invention has the following beneficial effects: There are multiple sealing designs inside the connection between the cable and the water pump housing. The interference fit between the cable and the cable sealing plug makes the sealing of the connection between the water pump motor cable elbow and the submersible pump body higher. A locking device is provided to lock the cable so that the cable is not easy to loosen. In addition, a cable protection device is provided to prevent the cable from excessive bending, making the submersible pump safer to use and longer in service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] In the figure: 1. Submersible pump body; 2. Sealing orifice plate; 3. O-ring; 4. Cable sealing plug; 5. Water pump motor cable elbow; 6. Cable clamp; 7. Clamp sealing ring; 8. Cable sealing retaining ring; 9. Cable sealing ring; 10. Nylon gasket; 11. Cable protection threaded sleeve; 12. Cable protection spring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The present invention provides a cable connector for a submersible pump, such as Figure 1 As shown, it includes a cable protection spring 12, a cable protection threaded sleeve 11, and a water pump motor cable elbow 5.

[0020] like Figure 1 As shown, a cable protection spring 12 is used for penetrating the cable. The cable protection spring 12 is connected to a cable protection threaded sleeve 11, and a cable sealing mechanism is arranged inside the cable protection threaded sleeve 11.

[0021] like Figure 1 The cable protection spring 12 is actually fixed to the cable protection threaded sleeve 11 by pressing the cable protection spring 12 into the spiral groove at the tail of the cable protection threaded sleeve 11, and inserting the bottom pin of the cable protection spring 12 into the spring fixing hole of the cable protection threaded sleeve 11 to complete the installation.

[0022] In actual use, the cable sealing mechanism includes a water pump motor cable elbow 5, a cable sealing ring 9, a nylon gasket 10, and a cable sealing retaining ring 8. The cable protection threaded sleeve 11 is threadedly connected to the water pump motor cable elbow 5. When the threaded connection is tightened, the cable sealing retaining ring 8 is pushed to squeeze the cable sealing ring 9 to cause elastic deformation, shrink inward, and fit tightly with the cable to form a seal.

[0023] In actual use, the cable protection threaded sleeve 11 and the connection end of the water pump motor cable elbow 5 are provided with an inner hole, and the inner hole is installed with a cable sealing ring 9 and a nylon washer 10. The nylon washer 10 separates the three cable sealing rings 9.

[0024] In actual use, the general seal is a cable sealing ring 9 or a raw material tape wrapped around the cable threaded sleeve 11. Figure 1 As shown, in this embodiment, a cable sealing ring 9 is used to seal between the cable protection threaded sleeve 11 and the water pump motor cable elbow 5.

[0025] In actual use, the distance between the top surface of the cable sealing ring 8 and the bottom surface of the inner hole of the cable protection threaded sleeve 11 is smaller than the free height of the nylon washer 10 and the cable sealing ring 9. After the cable protection threaded sleeve 11 is fully engaged with the water pump motor cable elbow 5, the axial height of the nylon washer 10 and the cable sealing ring 9 is compressed to seal the cable.

[0026] In actual use, the cable locking mechanism includes a water pump motor cable elbow 5, a cable sealing retaining ring 8, a cable clamp 6, and a clamp sealing ring 7. The cable protection threaded sleeve 11 is threadedly connected to the water pump motor cable elbow 5. When the threaded connection is tightened, the cable sealing retaining ring 8 is pushed to squeeze the cable clamp 6. The cable clamp 6 and the water pump motor cable elbow 5 are equipped with an inclined wedge, so that the cable clamp 6 slides inward to lock the cable and at the same time presses the clamp sealing ring 7 to fit tightly with the inclined surface of the water pump motor cable elbow 5 to form a seal.

[0027] In actual use, the clamp sealing ring 7 is installed between the water pump motor cable elbow 5 and the cable clamp 6 at the threaded connection between the cable protection threaded sleeve 11 and the water pump motor cable elbow 5, thereby sealing the gap between the two.

[0028] like Figure 1 As shown, a cable protection spring 12 is used for penetrating the cable, and the cable protection spring 12 is connected to the cable protection threaded sleeve 11.

[0029] like Figure 1 The cable protection spring 12 is actually fixed to the cable protection threaded sleeve 11 by pressing the cable protection spring 12 into the spiral groove at the tail of the cable protection threaded sleeve 11, and inserting the bottom pin of the cable protection spring 12 into the spring fixing hole of the cable protection threaded sleeve 11 to complete the installation.

[0030] In actual use, the cable protection threaded sleeve 11 and the water pump motor cable elbow 5 are provided with a threaded connection.

[0031] In actual use, the water pump motor cable elbow 5 is provided with an internal thread, and the internal thread is connected to the cable protection threaded sleeve 11.

[0032] like Figure 1 As shown, one end of the water pump motor cable elbow 5 is connected to the submersible pump body 1, and the sealing structure is installed inside the water pump motor cable elbow 5, and the sealing structure elastically seals the cable.

[0033] Specifically, the water pump motor cable elbow 5 is L-shaped, which is convenient for cable connection, protects the connection and reduces bending loss. The sealing structure includes a cable sealing plug 4, a sealing orifice plate 2 and an O-ring 3. The water pump motor cable elbow 5 and the submersible pump body 1 each have a step hole, the water pump motor cable elbow 5 has an O-ring groove, two sealing orifice plates 2 are respectively placed in the step holes of the water pump motor cable elbow 5 and the submersible pump body 1, the cable sealing plug 4 is placed between the two sealing orifice plates 2, and the O-ring 3 is placed in the O-ring groove of the water pump motor cable elbow 5.

[0034] Furthermore, when the water pump motor is connected to the submersible pump body 1 through the cable elbow 5, the cable penetrates the cable sealing plug 4 and the two sealing orifice plates 2, compressing the axial height of the cable sealing plug 4, and the cable sealing plug 4 is deformed to fit tightly with the cable and the entire inner wall. At the same time, the O-ring 3 is compressed, and the O-ring 3 is deformed to fit tightly with the entire inner wall.

[0035] The stepped hole of the water pump motor cable elbow 5 has the same axial diameter as the stepped hole of the submersible pump body 1. The stepped hole of the water pump motor cable elbow 5 is provided with a contact pressure surface for contacting with the sealing orifice plate 2. The stepped hole of the submersible pump body 1 is provided with a contact pressure surface for contacting with another sealing orifice plate 2. The sealing orifice plate 2 is placed on the contact pressure surface of the stepped hole of the water pump motor cable elbow 5. Another sealing orifice plate 2 is placed on the contact pressure surface of the stepped hole of the submersible pump body 1.

[0036] In this example, the cable sealing plug 4 is placed between the two sealing orifice plates 2. The cable sealing plug 4 is tapered, with the thin end facing the submersible pump body 1. The cable sealing plug 4 and the two sealing orifice plates 2 each have four holes for passing the cable, and the cable and the cable sealing plug 4 are interference fit. The cable sealing plug 4 is designed to be tapered, so that when its axial height is compressed, there is a certain amount of space for deformation, so that it will not flow out from the gap. The cable and the cable sealing plug 4 are interference fit, so that when the cable sealing plug 4 is deformed, the cable is pressed tighter, and at the same time, the cable sealing plug 4 fills the entire inner wall. Due to the elastic seal of both the cable sealing plug 4 and the elastic seal of the O-ring 3, the sealing performance of the connection between the water pump motor through the cable elbow 5 and the submersible pump body 1 is better.

[0037] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A cable connector for a submersible pump, comprising a submersible pump body (1), a cable protection spring (12), a cable protection threaded sleeve (11) and a water pump motor cable elbow (5), characterized in that: A water pump motor cable elbow (5) is connected to the cable connection end on the submersible pump body (1), the cable protection spring (12) is connected to one end of the water pump motor cable elbow (5) away from the submersible pump body (1), the water pump motor cable elbow (5) is provided with an internal thread, the end of the cable protection threaded sleeve (11) is connected to the internal thread of the water pump motor cable elbow (5), the cable protection spring (12) is connected to the cable protection threaded sleeve (11), and a cable sealing mechanism and a cable locking mechanism are provided inside the cable protection threaded sleeve (11).

2. A cable connector for a submersible pump as claimed in claim 1, characterized in that: The cable sealing mechanism comprises a water pump motor cable elbow (5), a cable sealing ring (9), a nylon washer (10), and a cable sealing retaining ring (8). The cable sealing retaining ring (8) squeezes the cable sealing ring (9) to undergo elastic deformation and shrink inwards to closely fit the cable. The cable protection threaded sleeve (11) and the cable protection spring (12) are provided with a conical spiral groove at the fixed end, the taper pitch of which meshes with the pitch of the cable protection spring (12) and a fixing hole is provided at the bottom. The nylon washer (10) separates the three cable sealing rings (9). The cable sealing retaining ring (8) is The outer diameter of the boss is smaller than the inner diameter of the thread of the water pump motor cable elbow (5); the boss height of the cable sealing retaining ring (8) is smaller than the gap after the cable protection threaded sleeve (11) and the water pump motor cable elbow (5) are fully meshed; the distance between the top surface of the cable sealing retaining ring (8) and the bottom surface of the matching inner hole of the cable protection threaded sleeve (11) is smaller than the free height of the nylon washer (10) and the cable sealing ring (9); after the cable protection threaded sleeve (11) and the water pump motor cable elbow (5) are fully meshed, the axial height of the nylon washer (10) and the cable sealing ring (9) is compressed to seal the cable.

3. A cable connector for a submersible pump as claimed in claim 2, characterized in that: The cable locking mechanism comprises a water pump motor cable elbow (5), a cable sealing retaining ring (8), a cable clamp (6), and a clamp sealing ring (7); when the threaded connection is tightened, the cable sealing retaining ring (8) is pushed to squeeze the cable clamp (6); the cable clamp (6) and the water pump motor cable elbow (5) are provided with an inclined wedge to cooperate; the water pump motor cable elbow (5) has a conical hole at the bottom of the thread; the conical hole cooperates with the cable clamp (6) to lock the cable.

4. A cable connector for a submersible pump as claimed in claim 3, characterized in that: The cable clamp (6) is a split structure, with two semicircular wedges forming a full circle for easy installation. The taper of the wedge surface is 10°-20°. The cable clamp (6) has a locking pattern inside, and the conical surface of the cable clamp (6) has a sealing ring groove structure.

5. A cable connector for a submersible pump as claimed in claim 4, characterized in that: The cable protection threaded sleeve (11) and the fixed end of the cable protection spring (12) are provided with a conical spiral groove, the taper pitch of which meshes with the pitch of the cable protection spring (12) and a fixing hole is provided at the bottom.

6. A cable connector for a submersible pump as claimed in claim 5, characterized in that: One end of the water pump motor cable elbow (5) is connected to the submersible pump body (1), and a sealing structure is provided inside the water pump motor cable elbow (5), the sealing structure comprising a cable sealing plug (4), a sealing orifice plate (2) and an O-ring (3). The water pump motor cable elbow (5) and the submersible pump body (1) respectively have step holes, and the water pump motor cable elbow (5) has an O-ring (3) groove. The two sealing orifice plates (2) are respectively placed in the step holes of the water pump motor cable elbow (5) and the step holes of the submersible pump body (1), the cable sealing plug (4) is placed between the two sealing orifice plates (2), and the O-ring (3) is placed in the O-ring (3) groove of the water pump motor cable elbow (5), and the O-ring (3) is deformed to fit tightly with the entire inner wall.

7. A cable connector for a submersible pump as claimed in claim 6, characterized in that: The stepped hole of the water pump motor cable elbow (5) has the same axial diameter as the stepped hole of the submersible pump body (1); the stepped hole of the water pump motor cable elbow (5) is provided with a contact pressure surface for contacting the sealing orifice plate (2); and the stepped hole of the submersible pump body (1) is provided with a contact pressure surface for contacting the other sealing orifice plate (2).

8. A cable connector for a submersible pump as claimed in claim 7, characterized in that: The cable sealing plug (4) is placed between the two sealing orifice plates (2), and the cable sealing plug (4) is tapered. The cable sealing plug (4) and the two sealing orifice plates (2) each have four holes for passing cables, and the cable and the cable sealing plug (4) are interference fit.

9. A cable connector for a submersible pump as claimed in claim 8, characterized in that: The O-ring (3) is placed in the O-ring groove of the water pump motor cable elbow (5); when the water pump motor cable elbow (5) is connected to the submersible pump body (1), the end surface of the water pump motor cable elbow (5) is combined with the end surface of the submersible pump body (1).

10. A cable connector for a submersible pump as claimed in claim 9, characterized in that: The water pump motor cable elbow (5) is L-shaped, and one end of the water pump motor cable elbow (5) is fixed to the submersible pump body (1) by means of a countersunk screw.

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