CN213205994U

CN213205994U - Anti-dry-rotation corrosion-resistant centrifugal pump

Info

Publication number: CN213205994U
Application number: CN202021708732.3U
Authority: CN
Inventors: 顾向东
Original assignee: Taicang Yinqiao Plastic Parts Co ltd
Current assignee: Taicang Yinqiao Plastic Parts Co ltd
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2021-05-14
Anticipated expiration: 2030-08-17

Abstract

The utility model belongs to the technical field of the centrifugal pump, concretely relates to prevent dry and change corrosion-resistant centrifugal pump. The device comprises a motor, a pump body and at least one protection device; the motor is in power connection with the pump body; the output end of the pump body is connected with a manifold which is connected with a protection device; the protection device is connected in series into a power supply circuit of the motor. The utility model provides a prevent dry and change corrosion-resistant centrifugal pump, simple structure is reliable, installation convenient to use can effectively prevent doing of centrifugal pump and change, protection pump body structure, increase of service life. And simultaneously, the utility model discloses a reasonable material selection control cost has realized better corrosion resisting property.

Description

Anti-dry-rotation corrosion-resistant centrifugal pump

Technical Field

The utility model belongs to the technical field of the centrifugal pump, concretely relates to prevent dry and change corrosion-resistant centrifugal pump.

Background

The centrifugal pump has the advantages of compact structure, wide working range, convenient installation and maintenance and the like, and is widely applied to various fields of agriculture, chemical industry, petroleum, mining industry, metallurgy, ships, electric power and the like. The actual service environment of centrifugal pump is different, and the operating mode is very different, and the pump body entry end liquid level can appear under some circumstances too low or by the complete evacuation, and centrifugal pump at this moment is in empty load state, and is idle running promptly. Idling, while not as much of an effect on the motor, can cause serious damage to the pump. When idling, no liquid exists in the pump, the sealing surface of the mechanical sealing part is subjected to dry friction for a long time, heat generated by friction cannot be quickly conducted out through fluid, and finally the sealing surface is overheated and damaged. Therefore, it is necessary to design a dry-running-proof centrifugal pump with good reliability.

Disclosure of Invention

To the above-mentioned problem that prior art exists, the utility model provides a prevent dry and change corrosion-resistant centrifugal pump overcomes.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: an anti-dry-rotation corrosion-resistant centrifugal pump comprises a motor, a pump body and at least one protection device; the motor is in power connection with the pump body, namely an output shaft of the motor is in power connection with the impeller in the pump body; the output end of the pump body is connected with a manifold which is connected with a protection device; the protection device comprises an upper shell, a lower shell, an elastic diaphragm insulation shell and an insulation cover; the upper shell and the lower shell are covered; the elastic diaphragm is arranged at the joint of the upper shell and the lower shell; a cavity formed by the elastic diaphragm and the upper shell in a surrounding manner is an upper cavity, and oil liquid, preferably silicone oil, is filled in the upper cavity; the cavity formed by the surrounding of the elastic diaphragm and the lower shell is a lower cavity chamber; the lower chamber is communicated with the manifold; the top of the upper shell is provided with an opening, and the opening is covered with an elastic sheet protruding to the upper cavity; an insulating top block protruding upwards is fixed in the center of the elastic sheet; the insulating shell is fixed on the upper shell, and the insulating cover covers the top of the insulating shell; a first conductive contact piece and a second conductive contact piece which are close to each other are arranged in the insulating shell; the upper end of the insulating top block extends into the insulating shell; when the insulating top block is not jacked up, the first conductive contact piece is separated from the second conductive contact piece; when the insulating top block is jacked up, the first conductive contact piece is contacted with the second conductive contact piece; the first conductive contact and the second conductive contact are connected in series into a power supply circuit of the motor.

When the centrifugal pump works normally, the pressure of the output end of the pump body is large, the pressure is transmitted to the lower cavity through the manifold, the elastic diaphragm is transmitted to the upper cavity, the elastic sheet protrudes upwards, the insulating jacking block is jacked, the first conductive contact piece and the second conductive contact piece are in contact, and the motor power supply circuit is in a conduction state. When the centrifugal pump idles, the pressure of the output end of the pump body is very small, the elastic sheet is in a natural state and cannot protrude upwards, and the power supply circuit of the motor is powered off, so that the centrifugal pump is prevented from idling for a long time. In addition, the normal starting of the motor is started by the bypass power supply, after the motor is started, the bypass is closed after the pressure of the outlet of the pump body is stable, and the circuit where the protection device is located supplies power, so that the normal working and dry rotation protection functions are realized.

The utility model has the further preferable proposal that the first conductive contact piece comprises a first wiring section, a first fixed section and a first extending section which are connected in sequence; the tail end of the first extending section is provided with a first contact; the first fixing section is fixed with the insulating shell; the second conductive contact piece comprises a second wiring section, a second fixed section and a second extending section which are connected in sequence; the tail end of the second extending section is provided with a second contact; the second fixing section is fixed with the insulating shell; the second contact is located under the first contact, and the top end of the insulating top block is in contact with the lower end face of the second extending section. The first wiring section and the second wiring section are used for wiring, and the contact of the first contact and the second contact is connected with and disconnected from the separation control circuit.

The utility model discloses a further preferred scheme is, and insulating kicking block is cylindrically, and the top is the protruding form of arc.

The utility model has the further preferable proposal that the elastic pieces are concentric circles, and are an edge fixing ring, a deformation ring and a central fixing part from the edge to the center in sequence; the edge fixing ring is fixed at the opening at the top of the upper shell, and the insulating top block is fixed on the central fixing part. The deformation ring is protruded downwards in a natural state, and when pressure is applied to the lower portion of the elastic sheet, the deformation ring is protruded upwards.

The utility model has the further preferable proposal that the elastic diaphragm is circular, and the edge is integrally connected with a clamping ring; the lower edge of the upper shell is provided with an upper groove matched with the clamping ring; the upper edge of the lower shell is provided with a lower groove matched with the clamping ring; the clamping ring is pressed between the upper groove and the lower groove. Through above-mentioned structural design guarantee that the installation of elasticity diaphragm is firm and sealed good.

The utility model has the further preferable proposal that the joint of the elastic diaphragm and the upper shell is tangent; the elastic diaphragm is tangent to the junction of the lower shell. The tangent design is favorable for protecting the elastic diaphragm and preventing the edge of the elastic diaphragm from being torn.

The utility model discloses a further preferred scheme is that, the motor is three-phase motor, and parallelly connected three protection device that sets up on the manifold, for each series connection inserts a protection device on the three routes live wire of motor power supply.

The utility model discloses a further preferred scheme is, and the motor is double-phase motor, sets up a protection device on the manifold, for series connection access protection device on the live wire of motor power supply.

The utility model has the further preferable proposal that the pump body is made of polypropylene material; the upper shell and the lower shell are made of polypropylene materials and are lined with polytetrafluoroethylene layers; the elastic diaphragm is made of neoprene material. The preference of the material is beneficial to controlling the cost and improving the overall corrosion resistance.

Has the advantages that: the utility model provides a prevent dry and change corrosion-resistant centrifugal pump, simple structure is reliable, installation convenient to use can effectively prevent doing of centrifugal pump and change, protection pump body structure, increase of service life. And simultaneously, the utility model discloses a reasonable material selection control cost has realized better corrosion resisting property.

Drawings

FIG. 1 is a schematic front view of example 1;

FIG. 2 is a schematic front view of example 2;

FIG. 3 is a schematic front view of the protective device;

FIG. 4 is a schematic view of the internal structure of the protection device;

FIGS. 5 and 6 are enlarged partial views of FIG. 4;

fig. 7 is a schematic front view of an insulating top block in example 2.

In the figure, a motor 2, a pump body 3, a protection device 1, an upper shell 11, a lower shell 12, an insulating shell 14 of an elastic diaphragm 13, an insulating cover 15, an elastic sheet 16, an insulating top block 17, a first conductive contact 141, a second conductive contact 142, a first wiring segment 1411, a first fixing segment 1412, a first extending segment 1413, a first contact 1414, a second wiring segment 1421, a second fixing segment 1422, a second extending segment 1423, a second contact 1424, an edge fixing ring 161, a deformation ring 162, a central fixing part 163, a collar 131, an upper groove 115 and a lower groove 121.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Example 1

An anti-dry-rotation corrosion-resistant centrifugal pump is shown in figures 1, 3, 4, 5 and 6 and comprises a motor 2, a pump body 3 and a protection device 1; the motor 2 is in power connection with the pump body 3; the output end of the pump body 3 is connected with a manifold which is connected with the protection device 1; the protection device 1 comprises an upper shell 11, a lower shell 12, an elastic diaphragm 13, an insulating shell 14 and an insulating cover 15; the upper shell 11 and the lower shell 12 are covered; the elastic diaphragm 13 is arranged at the joint of the upper shell 11 and the lower shell 12; a cavity formed by the elastic diaphragm 13 and the upper shell 11 in an enclosing mode is an upper cavity, and oil liquid is filled in the upper cavity; a cavity formed by the elastic diaphragm 13 and the lower shell 12 in a surrounding manner is a lower cavity; the lower chamber is communicated with the manifold; the top of the upper shell 11 is provided with an opening, and the opening is covered with an elastic sheet 16 which protrudes to the upper cavity; an insulating top block 17 protruding upwards is fixed in the center of the elastic sheet 16; the insulating shell 14 is fixed on the upper shell 11, and the insulating cover 15 covers the top of the insulating shell 14; a first conductive contact 141 and a second conductive contact 142 are arranged in the insulating case 14 and close to each other; the upper end of the insulating top block 17 extends into the insulating shell 14; when the insulating top block 17 is not lifted, the first conductive contact 141 is separated from the second conductive contact 142; when the insulating top block 17 is lifted up, the first conductive contact piece 141 is contacted with the second conductive contact piece 142; the first conductive contact 141 and the second conductive contact 142 are connected in series in the power supply circuit of the motor 2.

In this embodiment, the first conductive contact piece 141 includes a first connection section 1411, a first fixing section 1412 and a first extension section 1413 connected in sequence; the end of the first extension section 1413 is provided with a first contact 1414; the first fixing section 1412 is fixed with the insulating case 14; the second conductive contact 142 includes a second connection section 1421, a second fixing section 1422 and a second extending section 1423 connected in sequence; the end of the second protruding section 1423 is provided with a second contact 1424; the second fixing section 1422 is fixed to the insulating case 14; the second contact 1424 is located directly below the first contact 1414 and the top end of the top dielectric block 17 contacts the lower end surface of the second extension 1423.

In this embodiment, the elastic sheet 16 is in a concentric circle shape, and includes an edge fixing ring 161, a deformation ring 162, and a central fixing portion 163 sequentially from the edge to the center; the edge fixing ring 161 is fixed at an opening at the top of the upper case 11, and the insulating top block 17 is fixed at the central fixing portion 163.

In this embodiment, the elastic diaphragm 13 is circular, and a collar 131 is integrally connected to the edge; the lower edge of the upper shell 11 is provided with an upper groove 115 matched with the clamping ring 131; the upper edge of the lower shell 12 is provided with a lower groove 121 matched with the clamping ring 131; the collar 131 is compressed between the upper groove 115 and the lower groove 121.

In this embodiment, the motor 2 is a three-phase motor, three protection devices 1 are connected in parallel to the manifold, and one protection device 1 is connected in series to each of three live wires for supplying power to the motor 2.

Example 2

An anti-dry-rotation corrosion-resistant centrifugal pump is shown in figures 2 to 7 and comprises a motor 2, a pump body 3 and a protection device 1; the motor 2 is in power connection with the pump body 3; the output end of the pump body 3 is connected with a manifold which is connected with the protection device 1; the protection device 1 comprises an upper shell 11, a lower shell 12, an elastic diaphragm 13, an insulating shell 14 and an insulating cover 15; the upper shell 11 and the lower shell 12 are covered; the elastic diaphragm 13 is arranged at the joint of the upper shell 11 and the lower shell 12; a cavity formed by the elastic diaphragm 13 and the upper shell 11 in an enclosing mode is an upper cavity, and oil liquid is filled in the upper cavity; a cavity formed by the elastic diaphragm 13 and the lower shell 12 in a surrounding manner is a lower cavity; the lower chamber is communicated with the manifold; the top of the upper shell 11 is provided with an opening, and the opening is covered with an elastic sheet 16 which protrudes to the upper cavity; an insulating top block 17 protruding upwards is fixed in the center of the elastic sheet 16; the insulating shell 14 is fixed on the upper shell 11, and the insulating cover 15 covers the top of the insulating shell 14; a first conductive contact 141 and a second conductive contact 142 are arranged in the insulating case 14 and close to each other; the upper end of the insulating top block 17 extends into the insulating shell 14; when the insulating top block 17 is not lifted, the first conductive contact 141 is separated from the second conductive contact 142; when the insulating top block 17 is lifted up, the first conductive contact piece 141 is contacted with the second conductive contact piece 142; the first conductive contact 141 and the second conductive contact 142 are connected in series in the power supply circuit of the motor 2.

In this embodiment, the insulating top block 17 is cylindrical, and the top thereof is arc-shaped.

In this embodiment, the elastic diaphragm 13 is tangent to the junction of the upper shell 11; the elastomeric diaphragm 13 is tangential to the junction of the lower shell 12.

In this embodiment, the motor 2 is a two-phase motor, the manifold is provided with a protection device 1, and the protection device 1 is connected in series to a live wire for supplying power to the motor 2.

In this embodiment, the pump body 3 is made of polypropylene material; the upper shell 11 and the lower shell 12 are made of polypropylene materials and are lined with polytetrafluoroethylene layers; the elastic diaphragm 13 is made of a neoprene material.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements can be made without departing from the principle of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a prevent dry and change corrosion-resistant centrifugal pump which characterized in that: comprises a motor (2), a pump body (3) and at least one protection device (1); the motor (2) is in power connection with the pump body (3); the output end of the pump body (3) is connected with a manifold, and the manifold is connected with the protection device (1); the protection device (1) comprises an upper shell (11), a lower shell (12), an elastic diaphragm (13), an insulating shell (14) and an insulating cover (15); the upper shell (11) is covered with the lower shell (12); the elastic diaphragm (13) is arranged at the joint of the upper shell (11) and the lower shell (12); a cavity formed by the elastic diaphragm (13) and the upper shell (11) in a surrounding mode is an upper cavity, and oil liquid is filled in the upper cavity; the cavity formed by enclosing the elastic diaphragm (13) and the lower shell (12) is a lower cavity chamber; the lower chamber is in communication with the manifold; the top of the upper shell (11) is provided with an opening, and an elastic sheet (16) protruding to the upper cavity is covered at the opening; an insulating top block (17) protruding upwards is fixed in the center of the elastic sheet (16); the insulating shell (14) is fixed on the upper shell (11), and the insulating cover (15) covers the top of the insulating shell (14); a first conductive contact (141) and a second conductive contact (142) which are close to each other are arranged in the insulating shell (14); the upper end of the insulating top block (17) extends into the insulating shell (14); when the insulating top block (17) is not jacked, the first conductive contact piece (141) is separated from the second conductive contact piece (142); when the insulating top block (17) is jacked up, the first conductive contact piece (141) is contacted with the second conductive contact piece (142); the first conductive contact (141) and the second conductive contact (142) are connected in series into a power supply circuit of the motor (2).

2. The anti-dry-rotation corrosion-resistant centrifugal pump according to claim 1, characterized in that: the first conductive contact piece (141) comprises a first wiring section (1411), a first fixing section (1412) and a first extending section (1413) which are connected in sequence; the tail end of the first extending section (1413) is provided with a first contact (1414); the first fixing section (1412) is fixed with the insulating shell (14); the second conductive contact piece (142) comprises a second wiring section (1421), a second fixing section (1422) and a second extending section (1423) which are connected in sequence; the tail end of the second extending section (1423) is provided with a second contact (1424); the second fixing section (1422) is fixed with the insulating shell (14); the second contact (1424) is positioned right below the first contact (1414), and the top end of the insulating top block (17) is in contact with the lower end face of the second extending section (1423).

3. The anti-dry-rotation corrosion-resistant centrifugal pump according to claim 1, characterized in that: the insulating top block (17) is cylindrical, and the top of the insulating top block is arc-shaped and convex.

4. The anti-dry-rotation corrosion-resistant centrifugal pump according to claim 1, characterized in that: the elastic sheet (16) is in a concentric circle shape, and sequentially comprises an edge fixing ring (161), a deformation ring (162) and a central fixing part (163) from the edge to the center; edge fixing ring (161) is fixed at the opening at the top of upper shell (11), and insulating top block (17) is fixed on central fixing part (163).

5. The anti-dry-rotation corrosion-resistant centrifugal pump according to claim 1, characterized in that: the elastic diaphragm (13) is circular, and a clamping ring (131) is integrally connected to the edge of the elastic diaphragm; the lower edge of the upper shell (11) is provided with an upper groove (115) matched with the clamping ring (131); a lower groove (121) matched with the clamping ring (131) is formed in the upper edge of the lower shell (12); the collar (131) is pressed between the upper groove (115) and the lower groove (121).

6. The anti-dry-rotation corrosion-resistant centrifugal pump according to any one of claims 1 to 5, characterized in that: the junction of the elastic diaphragm (13) and the upper shell (11) is tangent; the elastic diaphragm (13) is tangent to the junction of the lower shell (12).

7. The anti-dry-rotation corrosion-resistant centrifugal pump according to claim 6, characterized in that: the motor (2) is a three-phase motor, the manifold is provided with three protection devices (1) in parallel, and the three fire lines for supplying power to the motor (2) are respectively connected with one protection device (1) in series.

8. The anti-dry-rotation corrosion-resistant centrifugal pump according to claim 6, characterized in that: the motor (2) is a two-phase motor, the manifold is provided with a protection device (1), and the protection device (1) is connected in series on a live wire for supplying power to the motor (2).

9. The anti-dry-rotation corrosion-resistant centrifugal pump according to claim 6, characterized in that: the pump body (3) is made of polypropylene material; the upper shell (11) and the lower shell (12) are made of polypropylene materials and are lined with polytetrafluoroethylene layers; the elastic diaphragm (13) is made of a chloroprene rubber material.