JP7030437B2 - Cable support structure and pumping equipment - Google Patents

Description

The present invention relates to a cable support structure for supporting a cable such as a float switch and a pump device.

Currently, a pump device called a so-called submersible pump installed in water is known as a means for draining sewage or the like in a sewage tank. Such a pump device includes a pump in which an impeller is housed in a pump casing having a pump chamber, and a motor for rotating the impeller. In the pump device, the impeller is driven by a motor, the impeller rotates in the pump chamber, and the liquid sucked into the pump chamber is increased in pressure and discharged to the secondary side.

In such a pump device, a float switch provided with a float in the cable is used in order to detect the water level in the sewage tank. The float switch is fixed at a predetermined height position so that the float floats on the water surface at a predetermined water level and the switch in the float can be switched. Therefore, there is known a cable support structure in which a float switch cable is sandwiched between a clamp having a groove in which the cable is arranged and a rod on which the clamp is fixed, and the cable is fixed to the rod (see, for example, Patent Document 1). ..

In such a cable support structure, by setting the depth of the groove of the clamp smaller than the outer diameter of the cable, the cable is in close contact with the rod, causing a large friction between the cable and the rod, and the position of the cable is displaced. Is configured to be preventable from occurring.

Japanese Unexamined Patent Publication No. 7-25282

Since the cable support structure described above has a structure in which the cable is sandwiched and fixed in the groove of the clamp and the gap between the rods, the cable is fixed to the rod in a state where the covering member of the cable is compressed. For this reason, since the conductor wire in the covering member is also fixed in the cable, there is a problem that bending stress is applied to the conductor wire when the float switch moves up and down. Further, when assembling the float switch and adjusting the water level, the length from the support position of the cable to the float may be fixed to the rod with a length different from the desired length. For this reason, there is a problem that workability is poor, for example, it is necessary to measure the support position of the cable and fix it to the rod at the time of installation.

Therefore, an object of the present invention is to provide a cable support structure and a pump device capable of easily supporting a cable and extending the life of the cable.

In order to solve the above problems and achieve the object, the cable support structure and the pump device of the present invention are configured as follows.

As one aspect of the present invention, the cable support structure is provided on a cable having a circular cross section, and is provided at both ends of a columnar supported portion and the supported portion in the axial direction, respectively, and the supported portion. A pair of flanges having an outer shape larger in the radial direction of the supported portion than the outer diameter of the supported portion, a support having a cable boot provided on one of the flanges, and a clip for supporting the supported portion are provided. Ru. The clip has an arc-shaped portion having a radius of curvature in which the supported portion can be arranged, and a part thereof is formed in an arcuate cylinder shape having a width smaller than the outer diameter of the supported portion, and the above-mentioned. Each of the open ends of the arcuate portion is provided with a lip that extends outward from the end portion in a direction away from each other. The lip is configured such that the axial width of the arcuate portion is larger than the axial width of the supported portion. The arcuate portion of the clip is configured such that its axial width is the same as the axial width of the supported portion.

As one aspect of the present invention, the pump device includes a seal chamber for accommodating a mechanical seal, a pump having a supply hole for supplying a lubricant to the seal chamber, a motor fixed to the upper portion of the pump, and the motor. An electrical component provided on the upper part of the cable, a cable having one end connected to the electrical component, a pair of flanges provided on the cable, a columnar supported portion provided between the pair of flanges, and one of the above. A support having a cable boot provided on a flange, a float switch having a float provided at the other end of the cable, a plug for closing the supply hole, and the supported support provided integrally with the plug. It comprises a support plug having a clip to support the portion. The clip has an arc-shaped portion having a radius of curvature in which the supported portion can be arranged, and a part thereof is formed in an arcuate cylinder shape having a width smaller than the outer diameter of the supported portion, and the above-mentioned. Each of the open ends of the arcuate portion is provided with a lip that extends outward from the end portion in a direction away from each other .

According to the present invention, it is possible to provide a cable support structure and a pump device capable of easily supporting a cable and extending the life of the cable.

The side view which shows the structure of the pump device which concerns on one Embodiment of this invention with a partial cross section. The side view which shows the structure of the float switch and the support of the cable support structure used in the pump device. The side view which shows the structure of the support member of the same cable support structure. Top view showing the structure of the support member.

Hereinafter, the pump device 1 using the cable support structure 15 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4.
FIG. 1 is a side view showing a configuration of a pump device 1 according to an embodiment of the present invention in a partial cross section, and FIG. 2 shows a configuration of a float switch 14 used in the pump device 1 and a support 51 of a cable support structure 15. A side view and FIG. 3 are side views showing the configurations of the clip 52 and the support member 53 of the cable support structure 15, and FIG. 4 is a top view showing the configurations of the clip 52 and the support member 53.

As shown in FIG. 1, the pump device 1 includes a motor 11, a pump 12 to which the motor 11 is fixed at an upper portion, a seal member 13 provided between the motor 11 and the pump 12, and a plurality of float switches 14. A cable support structure 15 for supporting the float switch 14 and an electrical component 16 are provided. Such a pump device 1 is, for example, a so-called submersible sewage pump installed in a sewage tank, a sewer, or the like to send sewage containing foreign matter (dirt, etc.).

The motor 11 includes a stator and a rotor rotated by the stator in the motor casing, and the rotating shaft 21 is connected to the rotor. The motor 11 is, for example, a permanent magnet motor.

The pump 12 includes a rotary shaft 21, an impeller 22 fixed to the rotary shaft 21, a pump casing 23 for accommodating the impeller 22, and a casing cover 24 for covering the pump casing 23.

The rotating shaft 21 is directly or indirectly connected to the rotor of the motor 11 and is formed to be rotatable following the rotation of the rotor. The rotary shaft 21 is rotatably supported by, for example, a motor casing via a bearing such as a bearing.

The impeller 22 is formed so as to be insertable into, for example, the pump casing 23. The impeller 22 is formed so that water can be pumped by rotating in the pump casing 23. The impeller 22 is, for example, a semi-open type impeller in which a plurality of blades are provided on a single disk-shaped shroud.

As shown in FIG. 1, the pump casing 23 has a suction port 31 arranged downward with the pump device 1 installed on the installation surface, a discharge port 32 formed on a part of the outer peripheral surface, and a suction port 31. A pump chamber 33 connected to the discharge port 32 and an opening 34 provided at a position facing the motor casing and continuous with the pump chamber 33 are provided. Further, the pump casing 23 is provided with a plurality of legs 37 for installing the pump device 1 on the lower surface thereof.

The suction port 31 is arranged with a predetermined gap from the installation surface of the pump device 1. The discharge port 32 is fluidly connected to, for example, a part of the pump chamber 33 in the radial direction. The discharge port 32 opens with the axial direction of the opening end facing upward. A pipe is connected to the discharge port 32.

The pump chamber 33 is formed so that the impeller 22 can be accommodated. Further, the pump chamber 33 has an inner peripheral surface capable of forming a volute-shaped flow path that can guide the liquid boosted by the impeller 22 to the discharge port 32.

The opening 34 has an inner diameter into which the impeller 22 can be inserted into the pump chamber 33. The mounting surface 35 is formed so as to be in contact with the end surface of the casing cover 24.

A plurality of legs 37 are arranged around the suction port 31 at equal intervals. The legs 37 are configured to have a length that allows the suction port 31 to be arranged at a predetermined height from the installation surface of the pump device 1 with the pump device 1 installed on the installation surface.

The casing cover 24 is connected to the pump casing 23 and covers the opening 34 of the pump casing 23. The casing cover 24 is connected to the motor casing. The casing cover 24, together with the motor casing, constitutes the seal chamber 13a. The casing cover 24 has a supply hole 24a for supplying a lubricant to the seal chamber 13a on a part of the outer peripheral surface thereof. The supply hole 24a is provided with a female screw portion on the inner peripheral surface thereof.

The seal member 13 is provided between the motor casing and the casing cover 24, and is configured so that the rotary shaft 21 and the casing cover 24 can be shaft-sealed. The seal member 13 is, for example, a mechanical seal. The seal member 13 is housed in a seal chamber 13a composed of a motor casing and a casing cover 24. The seal chamber 13a is filled with, for example, a lubricant.

As shown in FIG. 2, a plurality of float switches 14, for example, two are provided. The float switch 14 is connected to a cable 41, a float 42 provided at one end of the cable 41, a switch provided inside the float switch 14 that can be switched by the inclination angle of the float switch 14, and the other end of the cable 41. It has a connector and. Further, in the float switch 14, a support tool 51, which will be described later, of the cable support structure 15 is integrally fixed at a predetermined position of the cable 41. Here, the predetermined position is a portion supported by the cable support structure 15 and is a position having a predetermined length from the float switch 14.

The cable 41 includes a conductor wire and a covering member that covers the conductor wire. The cable 41 has a circular cross-sectional shape. A float 42 is fixed to one end of the cable 41, and a switch is electrically connected to the cable 41. A connector is connected to the other end of the cable 41. The cable 41 is connected to the electrical component 16 via the connector.

As shown in FIGS. 1 to 4, the cable support structure 15 includes a support 51, a clip 52, a support member 53, and a support plug 54. The cable support structure 15 is configured to be able to support the cables 41 of the plurality of float switches 14.

The support 51 is fixed at a predetermined position of the cable 41. The support 51 is provided at both ends of the columnar supported portion 51a and the supported portion 51a in the axial direction, and has an outer shape larger in the radial direction of the supported portion 51a than the outer diameter of the supported portion 51a. It includes a pair of flanges 51b and cable boots 51c provided on one of the flanges 51b. The support 51 is made of a resin material by integrally molding a supported portion 51a, a pair of flanges 51b, and a cable boot 51c. The support 51 is integrally molded with the cable 41 in advance, or is integrally fixed to the cable 41. In this case, the support 51 is fixed to the cable 41, for example, by heat shrinkage or by an adhesive.

The flange 51b is formed in a disk shape having an outer diameter larger than the outer diameter of the supported portion 51a. The cable boot 51c is integrally provided with the flange 51b arranged on the float 42 side of the cable 41. The cable boot 51c is configured in a truncated cone shape, for example, protruding from the flange 51b side with a predetermined length. The cable boot 51c is configured to be able to bend while supporting the cable 41 by providing a recess and a hole in the outer peripheral surface thereof.

The clip 52 is configured to be able to support the supported portion 51a. The clip 52 has a radius of curvature in which the supported portion 51a can be arranged inside, and is configured in an arcuate cylinder shape in which a part thereof opens with a width smaller than the outer diameter of the supported portion 51a. The clip 52 is configured such that the axial width of the opening end portion is larger than the axial width of the supported portion 51a. The clip 52 is configured such that the axial width of the portion located between the ends is the same as the axial width of the supported portion 51a.

More specifically, the clip 52 includes an arcuate portion 52a that is partially open and a pair of lips 52b provided at the open end of the arcuate portion 52a. The axial width of the arcuate portion 52a is configured to be the same as the axial width of the supported portion 51a. The arc-shaped portion 52a is configured such that the opening width is smaller than the outer diameter of the supported portion 51a. For example, the opening width of the arcuate portion 52a is configured to be slightly smaller than the outer diameter of the supported portion 51a. Further, the radius of curvature of the arcuate portion 52a is configured to be slightly larger than the radius of the supported portion 51a.

The lip 52b extends, for example, along the radial direction of the arcuate portion 52a from the opening end of the arcuate portion 52a. The lip 52b is configured such that the axial width of the arcuate portion 52a is larger than the axial width of the supported portion 51a. The pair of lips 52b spread outward from the opening end of the arcuate portion 52a in a direction away from each other.

The support member 53 includes a base 61 fixed to the motor casing or the electrical component 16, and a unidirectionally long rod 62 fixed to the base 61. The support member 53 includes a plurality of clips 52 fixed to the rod 62.

The base portion 61 is provided in a direction that intersects the hole portion 61a through which the rod 62 whose axial direction is arranged in the gravitational direction can be inserted and the hole portion 61a in the axial direction when the base portion 61 is fixed to the motor casing or the like. It is provided with a screw hole 61b and a set screw 61c, which is a so-called hollow set or a set screw screwed into the screw hole 61b. The set screw 61c is configured to be able to fix the rod 62 inserted in the hole portion 61a by screwing it into the screw hole 61b.

One end side of the rod 62 is fixed to the base portion 61, and a plurality of, for example, three clips 52 are integrally provided on the other end side of the rod 62. The three clips 52 provided on the rod 62 are arranged at equal intervals. The rod 62 is fixed to the hole 61a so that the axial direction of the arcuate portion 52a of the clip 52 is along the radial direction of the motor casing, for example. The height of the rod 62 from the base 61 to the clip 52 is adjusted by changing the position where the rod 62 is fixed by the set screw 61c. The rod 62 has a display unit 62a composed of a plurality of memories and lines indicating the height position of the rod 62 at a portion fixed to the base portion 61.

The support plug 54 has a male screw portion that can be screwed into the supply hole 24a, and includes a plug 54a that closes the supply hole 24a and a clip 52 that is integrally formed at the end of the plug 54a. In the support plug 54, for example, the clip 52 is integrally arranged with the plug 54a so that the axial direction of the arcuate portion 52a of the clip 52 is along the radial direction of the motor casing.

The electrical component 16 includes a cover 71, a control panel 73 arranged in the cover 71, and a power cable 72 connected to the control panel 73 and the motor 11.

The cover 71 has a pair of fixing portions 71a in which one end is closed and the power cable 72 and the cable 41 of the float switch 14 are inserted and fixed respectively. The pair of fixing portions 71a is the upper surface of the cover 71, and includes, for example, an opening provided at a symmetrical position and a support 71b inserted into the opening and supporting the cables 41 and 72 in a liquid-tight manner. There is. The cover 71 is made of, for example, a resin material.

The control panel 73 is configured to be able to drive the motor 11 at a predetermined rotation speed based on the ON / OFF of the float switch 14. For example, in the control panel 73, when the float switch 14 at the second highest position in the height direction, in other words, the float switch 14 at the lowest position is turned on, and the float switch 14 at the highest position is turned on, the control panel 73 is turned on. The motor 11 can be driven at a predetermined rotation speed. Further, the control panel 73 is configured to be able to stop the motor 11 when the float switch 14 at the lowest position in the height direction is turned off during the driving of the motor 11.

According to the pump device 1 having the cable support structure 15 configured in this way, the cable 41 of the float switch 14 is provided with the support 51 at a predetermined position, and the supported portion 51a of the support 51 is clipped 52. It is supported by being fitted to. Therefore, when the cable 41 is fixed to the support member 53 and the support plug 54, the cable 41 can be attached at a predetermined position. In other words, since the float switch 14 is provided with the support 51 at a predetermined position from the float 42 of the cable 41, when the cable 41 is fixed to the clip 52 provided on the support member 53 and the support plug 54, the float switch 14 is said to be the same. The length from the fixed position to the float 42 is constant. Therefore, when the float switch 14 is attached to the motor 11 or the pump 12 via the cable support structure 15, it is not necessary to measure the length from the float 42 to the fixed position, and the float switch 14 has high workability. Further, since the switch is switched at a constant angle by making the length constant, the float switch 14 can detect the water level with high accuracy.

Further, in the cable support structure 15, flanges 51b are provided at both ends of the supported portion 51a of the support tool 51, and the supported portion 51a is inserted from the opening of the arcuate portion 52a of the clip 52, so that the support tool is supported by the clip 52. The 51 is supported, and the movement of the support 51 in the axial direction is restricted by the flange 51b. Therefore, since the support 51 can be easily supported by the clip 52, the float switch 14 can be easily attached. Therefore, the pump device 1 has good workability.

Further, since the support 51 has the cable boot 51c on the flange 51b on the float 42 side, the bending performance of the cable 41 is improved. That is, even if the float 42 moves up and down due to the displacement of the water level and the cable 41 bends with the support 51 as a fulcrum, the stress generated by the bending is dispersed. Further, the radius of curvature of the clip 52 is configured to be slightly larger than the radius of the supported portion 51a. Therefore, the wire of the cable 41 is not fixed. From these things, it is possible to prevent the conductor wire in the cable 41 from being broken.

Further, the cable support structure 15 is composed of a support 51 integrally provided on the cable 41, and a clip 52 integrally provided on the rod 62 and the plug 54a. Further, the support 51 is configured to be fixed by being fitted to the clip 52. Therefore, the number of parts is small and the assembly is easy as compared with the configuration using the conventional clamp.

Further, the clip 52 is configured so that the width of the pair of lips 52b is widened as the pair of lips 52b is separated from the arcuate portion 52a, and the width thereof is wider than the width of the supported portion 51a. Therefore, when the support 51 is fitted to the clip 52, the supported portion 51a is arranged between the pair of lips 52b and pushed in, so that the width between the lips 52b is widened and the supported portion 51a is formed into an arcuate portion. It is possible to guide to 52a and has high workability. Further, when the support 51 fitted to the arcuate portion 52a moves to the opening side of the clip 52 by an external force or the like, the pair of flanges 51b abut on the lip 52b and the support 51 moves in the direction of coming off the clip 52. You can regulate that. As a result, after the support 51 is attached to the clip 52, the support 51 can be prevented from coming off from the clip 52, so that the cable 41 can be reliably fixed to the rod 62 or the plug 54a.

As described above, according to the cable support structure 15 used in the pump device 1 according to the embodiment of the present invention, the cable 41 can be easily supported and the life of the cable 41 can be improved. ..

The present invention is not limited to the above embodiment. For example, in the above-mentioned example, the configuration in which the cable support structure 15 is provided in the pump device 1 has been described, but the present invention is not limited to this, and if the configuration uses the float switch 14, the cable support structure 15 is used in addition to the pump device 1. Can support the cable 41. Similarly, the cable support structure 15 is not limited to the cable 41 of the float switch 14, and can support other cables.

Further, the support 51 has described the configuration in which the cable boots 51c are provided on one flange 51b, but the present invention is not limited to this, and the support 51 may be configured to have the cable boots 51c on both flanges 51b, respectively. In addition, various modifications can be made without departing from the gist of the present invention.
The following is a description equivalent to the invention described in the claims of the original application of the present application.
[1]
It is provided on a cable having a circular cross section, and is provided at both ends of a columnar supported portion and the supported portion in the axial direction, respectively, in the radial direction of the supported portion rather than the outer diameter of the supported portion. A support with a pair of flanges having a large outer shape and a cable boot provided on one of the flanges.
A clip that supports the supported portion and
A cable support structure characterized by being equipped with.
[2]
The clip has a radius of curvature in which the supported portion can be arranged, and is characterized in that a part thereof is formed in an arcuate cylinder shape that opens with a width smaller than the outer diameter of the supported portion [1]. ] The cable support structure described in.
[3]
The clip has lips provided at both ends of the opening, respectively.
The lip is configured to have a width larger than the width of the supported portion.
The cable support structure according to [2], wherein the clip is configured such that the width of the arcuate cylindrical portion continuous between the lips is the same as the width of the supported portion.
[4]
A seal chamber for accommodating a mechanical seal, and a pump having a supply hole for supplying a lubricant to the seal chamber.
With the motor fixed to the top of the pump,
An electrical component provided on the upper part of the motor and
A support having a cable having one end connected to the electrical component, a pair of flanges provided on the cable, a columnar supported portion provided between the pair of flanges, and a cable boot provided on one of the flanges. A float switch provided with a tool and a float provided at the other end of the cable, and a float switch.
A plug that closes the supply hole, a support plug having a clip that supports the supported portion integrally provided with the plug, and a support plug.
A pumping device characterized by being equipped with.
[5]
The clip has a radius of curvature in which the supported portion can be arranged, and is characterized in that a part thereof is formed in an arcuate cylinder shape in which a part thereof is opened with a width smaller than the outer diameter of the supported portion. The pump device according to [4].
[6]
The clip has lips provided at both ends of the opening, respectively.
The lip is configured to have a width larger than the width of the supported portion.
The pump device according to [5], wherein the clip is configured such that the width of the arcuate cylindrical portion continuous between the lips is the same as the width of the supported portion.
[7]
A support member comprising a rod long in one direction, at least one clip provided on one side of the rod, and a base for fixing the rod to the outer surface of the electrical component along the direction of gravity. The pump device according to any one of [4] to [6].
[8]
The pump device according to [7], wherein the base portion is configured so that the position where the rod is fixed can be changed.

1 ... Pump device, 11 ... Motor, 12 ... Pump, 13 ... Seal member, 13a ... Seal chamber, 14 ... Float switch, 15 ... Cable support structure, 16 ... Electrical parts, 21 ... Rotating shaft, 22 ... Impeller, 23 ... Pump casing, 24 ... Casing cover, 24a ... Supply hole, 31 ... Suction port, 32 ... Discharge port, 33 ... Pump chamber, 34 ... Opening, 35 ... Mounting surface, 37 ... Legs, 41 ... Cable, 42 ... Float, 51 ... Support, 51a ... Supported part, 51b ... Flange, 51c ... Cable boot, 52 ... Clip, 52a ... Arc-shaped part, 52b ... Lip, 53 ... Support member, 54 ... Support plug, 54a ... Plug, 61 ... base, 61a ... hole, 61b ... screw hole, 61c ... set screw, 62 ... rod, 71 ... cover, 71a ... fixed part, 71b ... support, 72 ... power cable, 73 ... control panel.

Claims (5)

It is provided on a cable having a circular cross section, and is provided at both ends of a columnar supported portion and the supported portion in the axial direction, respectively, in the radial direction of the supported portion rather than the outer diameter of the supported portion. A support with a pair of flanges having a large outer shape and a cable boot provided on one of the flanges.
A clip that supports the supported portion and
Equipped with
The clip has an arc-shaped portion having a radius of curvature in which the supported portion can be arranged, and a part thereof is formed in an arcuate cylinder shape having a width smaller than the outer diameter of the supported portion, and the above-mentioned. Each of the open ends of the arcuate portion is provided with a lip that extends outwardly away from the both ends.
The lip is configured such that the axial width of the arcuate portion is larger than the axial width of the supported portion.
The arcuate portion of the clip has a cable support structure in which the axial width thereof is the same as the axial width of the supported portion. A seal chamber for accommodating a mechanical seal, and a pump having a supply hole for supplying a lubricant to the seal chamber.
With the motor fixed to the top of the pump,
An electrical component provided on the upper part of the motor and
A support having a cable having one end connected to the electrical component, a pair of flanges provided on the cable, a columnar supported portion provided between the pair of flanges, and a cable boot provided on one of the flanges. A float switch provided with a tool and a float provided at the other end of the cable, and a float switch.
A plug that closes the supply hole, a support plug having a clip that supports the supported portion integrally provided with the plug, and a support plug.
Equipped with
The clip has an arc-shaped portion having a radius of curvature in which the supported portion can be arranged, and a part thereof is formed in an arcuate cylinder shape having a width smaller than the outer diameter of the supported portion, and the above-mentioned. A pump device provided at both ends of an arcuate portion having an opening, and provided with lips that spread outward from both ends in a direction away from each other. The lip is configured such that the axial width of the arcuate portion is larger than the axial width of the supported portion.
The pump device according to claim 2, wherein the arcuate portion of the clip is configured such that the axial width thereof is the same as the axial width of the supported portion. It is provided with a support member having a rod long in one direction, the clip provided on one side of the rod, and a base for fixing the rod to the outer surface of the electrical component along the direction of gravity. The pump device according to claim 2 or 3. The pump device according to claim 4, wherein the base portion is configured so that the position where the rod is fixed can be changed.

Images