Water injection structure of motor of shield pump

Abstract

The utility model provides a shield pump motor water injection structure, and belongs to the technical field of water pumps. The problem that an existing water supplementing structure is poor in working stability is solved. According to the water injection structure of the motor of the shield pump, the motor comprises a front bearing seat, the water injection structure comprises a water inlet channel arranged on the front bearing seat in a penetrating mode, the water inlet channel is in a straight strip shape, and the axis of the water inlet channel is parallel to the axis of the front bearing seat; a straight pipe body is fixed in the water inlet channel; the outer wall of the straight pipe body and the inner wall of the water inlet channel are sealed; a valve rod capable of sliding in the axial direction of the straight pipe body and a spring enabling the valve rod to tend to move forwards are arranged in the straight pipe body, the rear end of the valve rod extends out of the straight pipe body, and a sealing ring used for sealing a rear port of the straight pipe body is arranged on the outer side of the rear end of the valve rod. The water injection structure of the motor of the shield pump works stably.

Description

TECHNICAL FIELD

[0001] The utility model belongs to water pump technical field relates to a shield pump especially a shield pump motor water injection structure. BACKGROUND

[0002] The shield motor and other submersible motors in the submersible pump are all kept sealed to isolate the inside and outside to ensure normal operation of the motor. However, the shield motor has a small space in the stator inner cavity, and the liquid filled in the inner cavity is very small. In order to meet the needs of lubrication of the motor bearing and sufficient heat dissipation of the rotor, a corresponding water injection structure is generally provided to ensure that the stator inner cavity of the motor is always filled with liquid to meet the needs of lubrication of the motor bearing and sufficient heat dissipation of the rotor.

[0003] The existing water injection structure, such as a shield motor automatic water supplement device disclosed in Chinese patent library (application number: 201020263715.3), includes a water supplement channel penetrating inside and outside in the upper bearing seat of the motor, and a check valve and a honeycomb filter fixed together in the water supplement channel, wherein the check valve is close to the inner side of the upper bearing seat, and the honeycomb filter is close to the outer side of the upper bearing seat; the check valve includes a check valve sleeve, a check valve spring seat, a check valve spring and a check valve spool, the check valve sleeve is a sleeve with a small water passage hole at the upper end and a spool hole communicating with the small water passage hole at the lower end, the check valve spring seat is a conical frustum cylinder with a vertical extension flange at the top, the check valve spool is a bowl body with a spring fixing column at the bottom, the check valve spool is arranged in the spool hole to block the small water passage hole, one end of the check valve spring is sleeved on the spring fixing column, and the other end is sleeved on the vertical extension flange of the check valve spring seat, and the check valve spring seat is fixed at the outer end of the spool hole.

[0004] The above-mentioned water supplement device uses a bowl body to control the opening and closing of the small water passage hole, and in order to enhance the sealing effect, the bowl body is generally made of rubber material, and at the same time the bowl body is completely supported by the spring. Under the impact of water flow, the bowl body may deviate from its position, which may cause the large water passage hole to be unable to be completely opened or closed, affecting the normal operation of the water supplement device. Utility model content

[0005] The utility model aims at the above-mentioned problems existing in the prior art, and provides a shield pump motor water injection structure with stable work.

[0006] The utility model discloses a shielding pump motor water injection structure, and the motor includes the front bearing seat, and the water injection structure includes the water inlet channel of being set on the front bearing seat, and its characterized in that, the water inlet channel is straight strip shape, and the axis of water inlet channel is parallel with the axis of front bearing seat, and the straight pipe body is fixed coaxially in the water inlet channel, and the sealed space is formed between the outer wall of straight pipe body and the inner wall of water inlet channel, and the valve rod that can slide along the axial direction of straight pipe body and the spring that make valve rod have the trend of moving forward are equipped in straight pipe body, and valve rod is made of rigid material, and the rear end of this valve rod is out of straight pipe body, and the sealing ring for closing the rear end port of straight pipe body is equipped on the outside of valve rod rear end.

[0007] When the water in the motor is insufficient, the pressure in the motor is less than the pressure outside the motor, and under the action of pressure, the valve rod moves backward and drives the sealing ring to move backward to open the rear end port of the straight pipe body, and the water outside is discharged into the motor through the straight pipe body to accelerate the cooling of the motor.

[0008] The valve rod is made of rigid material, and the sealing ring is directly installed on the valve rod, so that the sealing ring can move accurately and stably, thereby stably controlling the opening and closing of the rear end port of the straight pipe body and improving the working stability of the water injection structure.

[0009] Meanwhile, the water inlet channel and the straight pipe body are both straight strip shape and parallel to the axis of the front bearing seat, so that the water can flow more smoothly into the straight pipe body and be discharged, thereby further improving the working stability of the water injection structure.

[0010] In the above-mentioned shielding pump motor water injection structure, the rear end inner wall of the straight pipe body is formed with a ring-shaped sealing seat, the front end outer wall of the valve rod is formed with a ring-shaped limiting seat, the spring is sleeved on the valve rod, and the two ends of the spring act on the sealing seat and the limiting seat respectively, so that the spring stably deforms elastically, the sliding stability of the valve rod is improved, and the water injection structure operates more stably.

[0011] In the above-mentioned shielding pump motor water injection structure, a ring-shaped groove for installing the sealing ring is formed on the rear end outer wall of the valve rod, so as to stably limit the sealing ring and accurately control the opening and closing of the rear end port of the straight pipe body.

[0012] In the above-mentioned shielding pump motor water injection structure, the rear end face of the sealing seat is a tapered face with a diameter gradually increasing from front to back, and the rear side of the tapered face extends to the rear end face of the straight pipe body; the type of the sealing ring is an O-shaped ring matched with the tapered face, and the sealing ring is pressed on the tapered face to close the rear end port of the straight pipe body. The sealing ring of the O-shaped ring type cooperates with the tapered face, which can not only strengthen the effect of closing the rear end port of the straight pipe body, but also correct the sliding direction of the valve rod, thereby improving the working stability of the water injection structure.

[0013] In the water injection structure of the motor of the shielding pump, the water inlet channel is a stepped hole, which is composed of a large hole and a small hole arranged in sequence from front to back, the outer wall of the front end of the straight pipe body has a positioning seat in the form of a ring, and the positioning seat is pressed on the bottom surface of the large hole to limit the position, so that the straight pipe body is installed in place at one time, facilitating assembly.

[0014] In the water injection structure of the motor of the shielding pump, the positioning seat is fixedly connected with the inner wall of the large hole, so that the straight pipe body can be pressed in or pushed out to complete the disassembly and assembly of the water injection structure, facilitating assembly and maintenance.

[0015] In the water injection structure of the motor of the shielding pump, a positioning groove in the form of a ring is formed on the outer wall of the positioning seat, and a rubber ring is arranged in the positioning groove, and the outer side surface of the rubber ring is in contact with the inner wall of the large hole to further enhance the sealing effect between the straight pipe body and the large hole.

[0016] Compared with the prior art, the water injection structure of the motor of the shielding pump has the following advantages:

[0017] 1. The valve rod is made of rigid material, and the sealing ring is directly installed on the valve rod, which can ensure the accurate and stable movement of the sealing ring, thereby stably controlling the opening and closing of the rear end port of the straight pipe body, and improving the working stability of the water injection structure.

[0018] 2. The water inlet channel and the straight pipe body are both in the form of a straight strip parallel to the axis of the front bearing seat, so that water can flow more smoothly into the straight pipe body and be discharged, thereby further enhancing the working stability of the water injection structure.

[0019] 3. The sealing ring in the form of an O-ring cooperates with the conical surface to not only enhance the sealing effect of the rear end port of the straight pipe body, but also correct the sliding direction of the valve rod, thereby enhancing the working stability of the water injection structure. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic view of the motor of the shielding pump.

[0021] Figure 2 is an enlarged schematic view of position A in Figure 1 .

[0022] Figure 3 is a structural schematic view of the front bearing seat.

[0023] In the figure, 1 is a front bearing seat, 1a is a water inlet channel, 1a1 is a large hole, 1a2 is a small hole, 2 is a straight pipe body, 2a is a sealing seat, 2b is a conical surface, 2c is a positioning seat, 3 is a valve rod, 3a is a limiting seat, 4 is a spring, 5 is a sealing ring, 6 is a rubber ring, and 7 is a filter screen. DETAILED DESCRIPTION

[0024] The utility model discloses a specific embodiment as follows and further describes the technical scheme of the utility model in connection with the drawings, but the utility model is not limited to these embodiments.

[0025] As shown in Figure 1 and Figure 3 The motor includes a front bearing seat 1, and the water injection structure includes a water inlet channel 1a arranged through the front bearing seat 1, wherein the water inlet channel 1a is in a straight strip shape, and the axis of the water inlet channel 1a is parallel to the axis of the front bearing seat 1.

[0026] Specifically,

[0027] As shown in Figure 2 The water inlet channel 1a is coaxially fixed with a straight pipe body 2, and a seal is formed between the outer wall of the straight pipe body 2 and the inner wall of the water inlet channel 1a. The straight pipe body 2 is provided with a valve rod 3 capable of sliding axially along the straight pipe body 2 and a spring 4 enabling the valve rod 3 to have a forward moving tendency. The valve rod 3 is made of rigid material, the rear end of the valve rod 3 extends out of the straight pipe body 2, and a sealing ring 5 for closing the rear end port of the straight pipe body 2 is arranged on the outer side of the rear end of the valve rod 3.

[0028] When the water in the motor is insufficient, the pressure inside the motor is smaller than the pressure outside the motor, and under the action of the pressure, the valve rod 3 moves backward to drive the sealing ring 5 to move backward and open the rear end port of the straight pipe body 2, so that the external water is discharged into the motor through the straight pipe body 2 to accelerate the cooling of the motor.

[0029] The valve rod 3 is made of rigid material, and the sealing ring 5 is directly installed on the valve rod 3, which can ensure the accurate and stable movement of the sealing ring 5, thereby stably controlling the opening and closing of the rear end port of the straight pipe body 2 and improving the working stability of the water injection structure.

[0030] Meanwhile, the water inlet channel 1a and the straight pipe body 2 are both in a straight strip shape parallel to the axis of the front bearing seat 1, so that the water can flow more smoothly into the straight pipe body 2 and be discharged, thereby further enhancing the working stability of the water injection structure.

[0031] Among them,

[0032] The valve rod 3 can be made of stainless steel, engineering plastic, iron-containing alloy, etc.

[0033] The spring 4 is installed in the following manner: a ring-shaped sealing seat 2a is formed on the inner wall of the rear end of the straight pipe body 2, and the sealing seat 2a is coaxially arranged with the straight pipe body 2. A ring-shaped limiting seat 3a is formed on the outer wall of the front end of the valve rod 3, and the limiting seat 3a is coaxially arranged with the valve rod 3. The spring 4 is sleeved on the valve rod 3, and the two ends of the spring 4 act on the sealing seat 2a and the limiting seat 3a respectively, so that the spring 4 stably deforms elastically, improves the sliding stability of the valve rod 3, and enables the water injection structure to operate more stably.

[0034] In this embodiment, the shape and size of the limiting seat 3a are matched with the inner hole at the front end of the straight tube 2, so that the valve stem 3 can slide more stably and accurately.

[0035] like Figure 2 As shown, the sealing ring 5 is installed as follows: an annular groove for installing the sealing ring 5 is provided on the outer wall of the rear end of the valve stem 3 to stably limit the sealing ring 5 and accurately control the opening and closing of the rear port of the straight pipe body 2. Further explanation: the rear end face of the sealing seat 2a is a conical surface 2b with a diameter that gradually increases from front to back, and the rear side of the conical surface 2b extends to the rear end face of the straight pipe body 2; the sealing ring 5 is an O-ring that matches the conical surface 2b, and the sealing ring 5 is pressed onto the conical surface 2b to seal the rear port of the straight pipe body 2. The O-ring type sealing ring 5, in conjunction with the conical surface 2b, not only enhances the sealing effect of the rear port of the straight pipe body 2, but also corrects the sliding direction of the valve stem 3, enhancing the working stability of the water injection structure.

[0036] like Figure 2 and Figure 3 As shown, the straight pipe body 2 and the front bearing seat 1 are tightly connected. Specifically, the water inlet channel 1a is a stepped hole, consisting of a large hole 1a1 and a small hole 1a2 arranged sequentially from front to back, and the large hole 1a1 and the small hole 1a2 are connected. The outer wall of the front end of the straight pipe body 2 has an annular positioning seat 2c. The positioning seat 2c is coaxially arranged with the straight pipe body 2, and the positioning seat 2c presses against the bottom surface of the large hole 1a1, serving as a limiting function to ensure the straight pipe body 2 is installed in place in one go, facilitating assembly. In the actual product, the straight pipe body 2 is tightly connected to the front bearing seat 1 through the positioning seat 2c and the inner wall of the large hole 1a1. This allows for the assembly and disassembly of the water injection structure simply by pressing in or pushing out the straight pipe body 2, facilitating assembly and maintenance.

[0037] To further explain, an annular positioning groove is provided on the outer wall of the positioning seat 2c. The positioning groove and the positioning seat 2c are coaxially arranged. A rubber ring 6 is provided in the positioning groove, and the outer side of the rubber ring 6 contacts and seals with the inner wall of the large hole 1a1 to further enhance the sealing effect between the straight tube body 2 and the large hole 1a1.

[0038] In the actual product, a filter screen 7 is also provided inside the large hole 1a1. The filter screen 7 is set on the front side of the straight pipe body 2 and is used to filter impurities in the water entering the straight pipe body 2.

[0039] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A water injection structure for shielding a motor of a canned motor pump, the motor comprising a front bearing seat (1), the water injection structure comprising a water inlet channel (1a) provided through the front bearing seat (1), characterized in that, The water inlet channel (1a) is in straight strip shape, and the axis of the water inlet channel (1a) is parallel to the axis of the front bearing seat (1); a straight pipe body (2) is coaxially fixed in the water inlet channel (1a), and a seal is formed between the outer wall of the straight pipe body (2) and the inner wall of the water inlet channel (1a); the straight pipe body (2) is provided with a valve rod (3) capable of sliding along the axis of the straight pipe body (2) and a spring (4) enabling the valve rod (3) to have a forward moving tendency, the valve rod (3) is made of rigid material, the rear end of the valve rod (3) extends out of the straight pipe body (2), and a sealing ring (5) for closing the rear end port of the straight pipe body (2) is arranged on the outer side of the rear end of the valve rod (3).

2. The shielding pump motor water injection structure according to claim 1, characterized in that, The rear end inner wall of the straight pipe body (2) is formed with a ring-shaped sealing seat (2a), the front end outer wall of the valve rod (3) is formed with a ring-shaped limiting seat (3a), the spring (4) is sleeved on the valve rod (3), and the two ends of the spring (4) act on the sealing seat (2a) and the limiting seat (3a) respectively.

3. The shielding pump motor water injection structure according to claim 2, characterized in that, An annular groove for mounting the sealing ring (5) is formed in the outer wall of the rear end of the valve rod (3).

4. The shielding pump motor water injection structure according to claim 3, characterized in that, The rear end face of the sealing seat (2a) is a tapered face (2b) gradually increasing in diameter from front to rear, and the rear side of the tapered face (2b) extends to the rear end face of the straight pipe body (2); the sealing ring (5) is an o-ring matched with the tapered face (2b), and the sealing ring (5) is pressed on the tapered face (2b) to close the rear end port of the straight pipe body (2).

5. The shielding pump motor water injection structure of claim 1, wherein, The water inlet channel (1a) is a stepped hole, which is composed of a large hole (1a1) and a small hole (1a2) arranged in sequence from front to rear, and the outer wall of the front end of the straight pipe body (2) is provided with a ring-shaped positioning seat (2c) which is pressed on the bottom surface of the large hole (1a1).

6. The shielding pump motor water injection structure of claim 5, wherein, The positioning seat (2c) is fixedly connected with the inner wall of the large hole (1a1) in close fit.

7. The shielding pump motor water injection structure according to claim 5 or 6, characterized in that, An annular positioning groove is formed in the outer side wall of the positioning seat (2c), and a rubber ring (6) is arranged in the positioning groove, and the outer side face of the rubber ring (6) is in contact and seal with the inner wall of the large hole (1a1).

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