Water throwing device for rotor impeller of large rotating machine

Abstract

The utility model relates to a water throwing device for a rotor impeller of a large rotating machine, and belongs to the technical field of Roots blower equipment. The water throwing device for the rotor impeller of the large rotating machine comprises a fan shell, a fan impeller and a fan rotating shaft, an air outlet is formed in the top of the shell, an air inlet is formed in the bottom of the shell, two 8-shaped rotating fan blades are rotationally installed in the shell through a rotating shaft, rotating shafts of the two rotating fan blades are in transmission connection through a gear, cavities are formed in the rotating fan blades, sinking grooves are formed in the rotating fan blades, and through holes communicated with the cavities are formed in the bottoms of the sinking grooves. According to the utility model, the rotor operates quickly, liquid in the inner hole of the impeller is thrown into the shuttle check valve under the action of high-speed centrifugal force, high-pressure liquid enters the groove at the outer diameter of the impeller through the fine water throwing channel, the area is increased, and the pressure and the like are converged in the groove on the surface and discharged out of the machine body after being released; and gas and liquid are driven to enter the impeller again.

Description

Technical Field

[0001] The utility model belongs to the technical field of Roots blower equipment, and specifically relates to a water-throwing device for a rotor impeller of a large-scale rotating machinery. Background Art

[0002] Roots blower is a type of positive displacement blower, with two three-blade impellers rotating relative to each other in a space sealed by a casing and a wall panel. Since each impeller adopts an involute or an envelope of an epicycloid, the three blades of each impeller are exactly the same, and the two impellers are also exactly the same, which greatly reduces the difficulty of processing. CNC equipment is used in the processing of the impellers to ensure that the two impellers can maintain a certain minimum gap no matter where the two impellers rotate to when the center distance remains unchanged, thereby ensuring that the gas leakage is within the allowable range.

[0003] The two impellers rotate towards each other. Due to the extremely small gaps between the impellers, the impellers and the casing, and the impellers and the wall panels, a vacuum state is formed at the air inlet. Air enters the air inlet chamber under the action of atmospheric pressure, and then two blades of each impeller, the wall panel and the casing form a sealed chamber. During the rotation of the impellers, the air in the air inlet chamber is continuously brought to the exhaust chamber by the sealed chamber formed by the two blades. Because the impellers in the exhaust chamber are meshed with each other, the air between the two blades is squeezed out. With this continuous operation, air is continuously transported from the air inlet to the air outlet. This is the entire working process of the Roots blower.

[0004] Due to the three-blade rotor structure and the reasonable structure of the air inlet and outlet in the shell, the fan has low vibration and low noise. The impeller and shaft are an integral structure and the impeller is wear-free, the fan performance remains unchanged, and it can operate continuously for a long time. The fan has a large volume utilization rate, high volume efficiency, compact structure, and flexible installation methods. A full range of models can meet the needs of different users for different purposes.

[0005] Roots blower is the core equipment for conveying flammable and explosive gases in the petrochemical industry, and it operates 24 hours a day. Its operating conditions will directly affect the efficiency and revenue of the production enterprise, so there is a strict target control on the unplanned shutdown control rate of the host equipment.

[0006] Due to the separation effect of the acid gas scrubber, the acetylene gas transported by the Roots blower contains 5.8% saturated water. If this part of water cannot be discharged from the main engine in time, the resistance drop of the rotor impeller will increase, the effective power will increase, the current will increase, the outlet pressure will increase, and the rapid thermal expansion will burn the motor and Roots blower, causing significant economic losses and environmental pollution. Therefore, it is urgent to discharge the liquid contained in the rotor impeller of the Roots blower in time to avoid accidents. Summary of the invention

[0007] In order to solve the technical problem that due to the separation effect of the acid gas scrubber, the acetylene gas transported by the Roots blower contains 5.8% saturated water. If this part of water cannot be discharged from the main engine in time, it will cause the resistance drop of the rotor impeller to increase, the effective power to increase, the current to increase, the outlet pressure to increase, and the rapid thermal expansion will burn the motor and the Roots blower, causing significant economic losses and environmental pollution. The utility model makes the rotor run quickly, and the liquid in the inner hole of the impeller is thrown into the shuttle check valve under the action of high-speed centrifugal force. The high-pressure liquid enters the groove of the outer diameter of the impeller through the fine water-throwing channel, and the area of ​​the groove increases. After the pressure is released, it gathers in the groove on the surface and is discharged out of the body, driving the gas and liquid to re-enter the impeller.

[0008] In order to achieve the above-mentioned purpose, the utility model is implemented according to the following technical scheme:

[0009] A water-throwing device for a large rotary machinery rotor impeller, the water-throwing device for a large rotary machinery rotor impeller comprising a fan housing 1, a fan impeller 2, and a fan rotating shaft 3; an air outlet 4 is provided on the top of the housing, an air inlet is provided on the bottom of the housing, two "8"-shaped rotating blades are installed in the housing through a rotating shaft, the rotating shafts 3 of the two rotating blades are connected through a gear transmission, a cavity 5 is provided inside the rotating blade, a sink 6 is provided on the rotating blade, and a through hole 7 connected to the cavity 5 is provided at the bottom of the sink 6.

[0010] Preferably, the sink 6 is rectangular.

[0011] Preferably, the length of the sink 6 is 12 mm.

[0012] Preferably, the width of the sink 6 is 8 mm.

[0013] Preferably, the depth of the sink 6 is 4 mm.

[0014] Preferably, the diameter of the through hole 7 is 6 mm.

[0015] Preferably, a countersunk hole 8 matching the position of the through hole 7 is provided on the inner wall of the cavity 5 .

[0016] Preferably, a check valve is installed in the counterbore 8.

[0017] Preferably, the countersunk hole 8 is rectangular, and the dimensions of the countersunk hole 8 are 50 mm in length, 50 mm in width, and 35 mm in depth.

[0018] Preferably, the check valve is connected to the inner wall of the cavity 5 via a stainless steel screw.

[0019] Beneficial effects of the utility model:

[0020] The utility model realizes rapid rotation of the rotor, and the liquid in the inner hole of the impeller is thrown into the shuttle check valve under the action of high-speed centrifugal force, and the high-pressure liquid enters the groove of the outer diameter of the impeller through a fine water-throwing channel, and the inner area of ​​the groove is increased. After the pressure is released, it is gathered in the groove on the surface and discharged out of the body, driving the gas and liquid to re-enter the inside of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0023] Figure 2 This is a schematic diagram of the installation of the sink of the utility model;

[0024] Figure 1 In the figure, 1-housing, 2-impeller, 3-rotating shaft, 4-air outlet, 5-cavity, 6-sink, 7-through hole, 8-sink hole. DETAILED DESCRIPTION

[0025] Those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be considered to limit the scope of the present invention. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. If the manufacturer of the materials or equipment used is not specified, they are all conventional products that can be purchased.

[0026] Those skilled in the art will appreciate that, unless expressly stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present utility model refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it may be directly connected to the other element, or there may be intermediate elements. In addition, the "connection" used here may include wireless connection.

[0027] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two. The terms "inside", "upper", "lower", etc., indicating positions or state relationships, are based on the positions or state relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operate in a specific position, and therefore cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention will be understood according to specific circumstances.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meaning as the general understanding of ordinary technicians in the field to which the utility model belongs. It should also be understood that those terms such as those defined in general dictionaries should be understood to have the same meaning as the meaning in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0030] Depend on Figure 1 As shown, a water-throwing device for a large rotary machinery rotor impeller comprises a fan casing 1, a fan impeller 2, and a fan rotating shaft 3; an air outlet 4 is provided on the top of the casing, and an air inlet is provided on the bottom of the casing. Two "8"-shaped rotating blades are installed in the casing through a rotating shaft, and the rotating shafts 3 of the two rotating blades are connected by a gear transmission. During installation, vibration will be generated due to the high-speed operation of the machine, and the pulsation of the air inside it will also increase the vibration of the Roots blower, so the Roots blower needs to be fixed on the ground during installation. Depending on the fan model, a 150*150mm square and 300mm deep pit is dug at the corresponding position on the ground according to the size of the fan, and the anchor bolts are buried. The fan is then connected with bolts and nuts. Finally, the square pit is filled with cement concrete. After the concrete is fixed, the nuts are tightened to firmly connect the fan base and the concrete. This can reduce the vibration displacement of the Roots blower during operation, improve the operating safety of the equipment, and greatly extend the service life of the fan due to the reduced vibration.

[0031] A cavity 5 is provided inside the rotating blade, a sink 6 is provided on the rotating blade, and a through hole 7 connected to the cavity 5 is provided at the bottom of the sink 6. When the rotor rotates rapidly, the liquid in the impeller 2 is thrown into the shuttle-type through hole 7 under the action of high-speed centrifugal force, and the high-pressure liquid enters the sink 6 at the outer diameter of the impeller 2 through a fine water-throwing channel, and the area of ​​the sink 6 increases. After the pressure is released, it gathers in the sink 6 on the surface and is discharged out of the body.

[0032] The manufacturing process of the sink groove 6 is as follows: 6 rectangular drainage sink grooves 6 with a length of 12mm*width of 8mm*depth of 4mm are drilled and milled evenly on the surface of the impeller 2 of the rotor with a peak length of 1400mm, and then a 6mm hole is drilled in the middle of each sink groove 6 to communicate with the inner wall of the impeller 2. The function of the CNC machine tool is used again to process a 50mm long*50mm wide*35mm deep sink hole 8 at each drainage hole of each hole wall, and the shuttle check valve is installed in the sink hole 8 and locked with stainless steel screws in combination with anti-loosening measures to prevent it from falling off during operation.

[0033] Preferably, a check valve is installed in the counterbore 8. The purpose of installing the check valve is to prevent the high pressure at the outlet of the Roots blower from being reversed, driving the gas and liquid to re-enter the impeller 2. The check valve can also be used in the pipeline to provide supply to the auxiliary system where the pressure may rise to exceed the system pressure. Check valves can be mainly divided into swing check valves (rotating according to the center of gravity) and lift check valves (moving along the axis). The function of this type of valve is to allow the medium to flow in one direction only and prevent the flow in the opposite direction. Usually this type of valve works automatically. Under the action of the fluid pressure flowing in one direction, the valve disc opens; when the fluid flows in the opposite direction, the fluid pressure and the self-reclosing valve disc of the valve disc act on the valve seat, thereby cutting off the flow. Among them, the check valve belongs to this type of valve, which includes a swing check valve and a lift check valve. The swing check valve has a hinge mechanism and a valve disc like a door that freely rests on the inclined valve seat surface. In order to ensure that the valve disc can reach the appropriate position of the valve seat surface every time, the valve disc is designed in the hinge mechanism so that the valve disc has enough swing space and makes the valve disc truly and comprehensively contact the valve seat. The valve disc can be made entirely of metal, or it can be inlaid with leather, rubber, or a synthetic covering surface on the metal, depending on the performance requirements. When the swing check valve is fully open, the fluid pressure is almost unimpeded, so the pressure drop through the valve is relatively small. The valve disc of the lift check valve is located on the valve seat sealing surface on the valve body. In addition to the valve disc being able to rise and fall freely, the rest of this valve is like a stop valve. The fluid pressure lifts the valve disc from the valve seat sealing surface, and the medium reflux causes the valve disc to fall back onto the valve seat and cut off the flow. Depending on the conditions of use, the valve disc can be a full metal structure or inlaid with a rubber pad or rubber ring on the valve disc frame. Like the stop valve, the passage of the fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow of the swing check valve is less restricted.

[0034] Preferably, the check valve is connected to the inner wall of the cavity 5 by means of stainless steel screws. The connection is firm and stable. The stainless steel screws can be used for a long time, thus effectively increasing the service life of the device.

[0035] Working principle of this utility model:

[0036] The utility model realizes rapid rotation of the rotor, and the liquid in the inner hole of the impeller 2 is thrown into the shuttle check valve under the action of high-speed centrifugal force. The high-pressure liquid enters the sink groove 6 at the outer diameter of the impeller 2 through the fine water-throwing channel, and the inner area of ​​the sink groove 6 is increased. After the pressure is released, it is gathered in the sink groove 6 on the surface and discharged out of the body, driving the gas and liquid to re-enter the inside of the impeller 2.

[0037] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model; the dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A water-removing device for a large rotary machine rotor impeller, characterized in that: The water-removing device for a large rotary machine rotor impeller comprises a fan housing (1), a fan impeller (2), and a fan rotating shaft (3); the fan housing (1) is provided with an air outlet (4) at the top, and an air inlet at the bottom; two "8"-shaped rotating blades are rotatably mounted in the fan housing (1) via a rotating shaft; the rotating shafts (3) of the two rotating blades are connected via a gear transmission; a cavity (5) is provided inside the rotating blade; a sink (6) is provided on the rotating blade; and a through hole (7) communicating with the cavity (5) is provided at the bottom of the sink (6).

2. A water-removing device for a large rotary machine rotor impeller according to claim 1, characterized in that: The sink (6) is rectangular.

3. A water-removing device for a large rotary machine rotor impeller according to claim 1, characterized in that: The length of the sink (6) is 12 mm.

4. A water-removing device for a large rotary machine rotor impeller according to claim 1, characterized in that: The width of the sink (6) is 8 mm.

5. The water-removing device for a large rotary machine rotor impeller according to claim 1, characterized in that: The depth of the sink (6) is 4 mm.

6. The water-removing device for a large rotary machine rotor impeller according to claim 1, characterized in that: The diameter of the through hole (7) is 6 mm.

7. The water-removing device for a large rotary machine rotor impeller according to claim 1, characterized in that: A countersunk hole (8) matching the position of the through hole (7) is provided on the inner wall of the cavity (5).

8. The water-removing device for a large rotary machine rotor impeller according to claim 7, characterized in that: A check valve is installed in the counterbore (8).

9. The water-removing device for a large rotary machine rotor impeller according to claim 7, characterized in that: The countersunk hole (8) is rectangular, and the dimensions of the countersunk hole (8) are 50 mm in length, 50 mm in width, and 35 mm in depth.

10. The water-removing device for a large rotary machine rotor impeller according to claim 8, characterized in that: The check valve is connected to the inner wall of the cavity (5) via a stainless steel screw.

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