Breathing device for low-temperature centrifugal pump

Abstract

The utility model belongs to a breathing device for a low-temperature centrifugal pump. Comprising a centrifugal pump body, a pump shaft on the centrifugal pump body is installed in a bearing chamber in a penetrating mode, and a gas condensation discharging unit is arranged between the top of the bearing chamber and a breathing cap. The gas condensation and discharge unit at least comprises an outer cylinder and an inner cylinder arranged in the center of the lower portion in the outer cylinder, a breathing cap is arranged in the middle of the outer top of the outer cylinder, and the inner cylinder penetrates through the bottom of the outer cylinder to be communicated with the top of the bearing chamber; a plurality of upwards inclined communicating holes are formed in the cylinder wall of the inner cylinder body in the outer cylinder body; a liquid drainage hole with a rubber plug is formed in the outer side of the inner barrel body and corresponds to the barrel bottom of the outer barrel body; by means of the design, the situation that water enters the bearing chamber to pollute lubricating oil can be avoided, and the advantage of reducing operation cost and maintenance cost is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low temperature centrifugal pump accessory technical field, especially, it relates to a kind of breathing device for low temperature centrifugal pump. BACKGROUND

[0002] Low temperature centrifugal pump existing breathing cap is arranged at the top of bearing chamber, is directly connected with bearing chamber by thread, and conventional breathing cap has the following three effects: (1) after centrifugal pump maintenance or lubricating oil consumption to lower limit, the existing breathing cap needs to be removed from breathing port and lubricating oil is added to bearing chamber, (2) prevent rainwater and impurities from entering bearing chamber directly, so as to affect the quality of lubricating oil, and further affect the normal operation of equipment, (3) ensure that the pressure inside and outside bearing chamber is consistent during the operation of centrifugal pump. However, during daily operation, the operating temperature of low temperature centrifugal pump body is about-55 DEG C to-60 DEG C, the pump body has cold insulation layer, but ice formation phenomenon still exists; the temperature in bearing box is about 50 DEG C to 60 DEG C, and there is a temperature difference of about 70 DEG C to 80 DEG C near the breathing cap device of pump bearing chamber. The above-mentioned situation causes high humidity near the breathing cap, and condensate water vapor is easily gathered around the breathing cap and enters the bearing chamber with the breathing action of the breathing cap. As the moisture in the bearing chamber accumulates more and more, emulsification of lubricating oil occurs, and if it is not found in time, a major equipment accident of bearing and shaft seizure may occur, which has different degrees of influence on the stable operation of production system. Even if it is found in time, it will also cause waste of resources and property loss. The operating cycle of conventional low temperature centrifugal pump lubricating oil is about 3 months, and the average operating cycle of lubricating oil caused by the water entering the bearing chamber with the conventional breathing cap is about 20 days, which not only increases the operating cost, but also greatly increases the maintenance cost. CONTENT OF UTILITY MODEL

[0003] The utility model provides a kind of breathing device for low temperature centrifugal pump, to solve the technical problem proposed in the above background art.

[0004] The technical scheme of the utility model is as follows:

[0005] A kind of breathing device for low temperature centrifugal pump, including centrifugal pump body, pump shaft on centrifugal pump body is worn in bearing chamber, and gas condensate discharge unit is arranged between the top of bearing chamber and breathing cap;Gas condensate discharge unit at least includes outer cylinder body, and inner cylinder body is arranged on the lower center position in outer cylinder body, and breathing cap is arranged on the outer top middle position of outer cylinder body, and the top of bearing chamber is communicated with the bottom of outer cylinder body by inner cylinder body;A plurality of upward inclined communication holes are formed in the cylinder wall of inner cylinder body in outer cylinder body;The liquid discharge hole with rubber plug is formed in the cylinder bottom of outer cylinder body corresponding to the outer side of inner cylinder body.

[0006] The utility model discloses beneficial effect is: the utility model discloses the gas condensate external exhaust unit between the top of bearing chamber and the breathing cap is established, using the cold quantity of centrifugal pump pump body outward radiation as the foundation, through the inner wall of outer cylinder body and the communication hole of the upwardly inclined setting realizes the moisture in the air to become condensate, and is collected between the outer cylinder body and the inner cylinder body and is externally discharged, to reach the situation of avoiding moisture to enter bearing chamber and pollute lubricating oil occurs, to reach the advantage of reducing operation cost and maintenance cost, further, the utility model discloses the transformation to the existing equipment, and does not influence the structure and operation of original centrifugal pump pump body, bearing chamber and breathing cap, to reach the feature of saving the transformation cost.

[0007] Preferably, the top of the inner cylinder body is an inner cylinder cover with a slope structure.

[0008] Preferably, the upper part of the inner cylinder cover is connected with the inner wall of the top of the outer cylinder body.

[0009] Preferably, the aperture of the communication hole is φ1.5mm, which is uniformly distributed on the periphery of the upper part of the inner cylinder body and is distributed in two rows.

[0010] Preferably, the communication hole and the center line of the inner cylinder body form an angle of 120°.

[0011] Preferably, the upper part of the bearing chamber is provided with an integral limit ring plate on the outer circumference of the corresponding inner cylinder body.

[0012] Preferably, the angle between the inner cylinder cover and the horizontal plane is 45°.

[0013] The utility model discloses a kind of breathing devices for low-temperature centrifugal pump according to the above scheme, the utility model is the modification of existing low-temperature centrifugal pump, specifically gas condensate external discharge unit is additionally provided between existing bearing chamber and breathing cap, to achieve the moisture in the gas entering from outside becomes liquid phase and external discharge, avoid its entering the emulsification phenomenon caused in lubricating oil of bearing chamber, the above-mentioned setting can reduce the modification cost of existing equipment, while reducing operating cost and maintenance cost;Specifically, the utility model utilizes existing breathing cap air inlet, first, air enters the utility model before, due to the lower temperature of external air, the utility model is higher under the influence of temperature in bearing chamber, when air contacts outer cylinder outer surface, most of water vapor will condense;Second, air enters between outer cylinder and inner cylinder, due to the lower temperature of external air, the temperature in bearing chamber is higher, when air contacts the upper surface of inner cylinder cover, most of water vapor will condense, and cooperate with the inner cylinder cover of inclined arrangement can make liquid phase of water vapor condensation quickly enter between outer cylinder and inner cylinder temporary storage;Third, uncondensed water vapor contacts outer cylinder inner wall and makes part of water vapor condense, condensed liquid phase water under its gravity along outer cylinder inner wall enters between outer cylinder and inner cylinder temporary storage, finally, air can make moisture in air realize fourth liquefaction through air hole, and make liquid phase condensate backflow to between outer cylinder and inner cylinder temporary storage through the air hole of inclined arrangement;The moisture of air is liquefied four times to avoid its entering lubricating oil and emulsification phenomenon, improve the use time of lubricating oil, reduce the replacement frequency of lubricating oil, to reach the characteristics of reducing operating cost and maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structural schematic diagram of the utility model.

[0015] Figure 2 It is the structural schematic diagram of the gas condensation external discharge unit of the utility model.

[0016] Mark in drawing: 1, centrifugal pump body; 2, pump shaft; 3, bearing chamber; 4, breathing cap; 5, outer cylinder; 6, inner cylinder; 7, communication hole; 8, rubber plug; 9, inner cylinder cover; 10, limit ring plate. DETAILED DESCRIPTION

[0017] In order to make those skilled in the art better understand the technical scheme of the utility model, the utility model is described in detail below in conjunction with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the utility model.

[0018] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0019] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate and simplify the description of the utility model and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating or implying relative importance.

[0020] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0021] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0022] like Figure 1 、 2As shown in the utility model is a kind of low-temperature centrifugal pump breathing device, including centrifugal pump body 1, the pump shaft 2 on centrifugal pump body 1 is worn in bearing chamber 3, the top of bearing chamber 3 is equipped with gas condensation exhaust unit between breathing cap 4;Gas condensation exhaust unit at least includes outer cylinder body 5, and the inner cylinder body 6 of lower center position on outer cylinder body 5 is set, the outer top middle position of outer cylinder body 5 is equipped with breathing cap 4, and the top of bearing chamber 3 is connected with the bottom of outer cylinder body 5 by inner cylinder body 6 passing through;The cylinder wall of inner cylinder body 6 in the inside of outer cylinder body 5 is equipped with several upwardly inclined communication holes 7;The cylinder bottom of outer cylinder body 5 outside corresponding inner cylinder body 6 is equipped with the liquid discharge hole of rubber plug 8.It is as described in the foregoing, the low-temperature centrifugal pump in the utility model is used to handle low-temperature medium, and the operating temperature of general low-temperature medium pump body is about-55 ℃~-60 ℃, and the above-mentioned working temperature can reduce the temperature of the surrounding of low-temperature medium pump, and the temperature of lubricating oil in bearing chamber 3 is generally at 50 ℃~60 ℃;Therefore, the temperature difference of low-temperature medium pump is larger, and the air around breathing cap has higher humidity, and the aforementioned higher humidity air enters bearing chamber and can make lubricating oil emulsification with the breathing action of breathing cap;In order to solve the above technical problem, the utility model is handled to higher humidity air by setting gas condensation exhaust unit, to realize the liquefaction of water in air and exhaust, and avoid water from entering bearing chamber 3 to achieve the characteristics of improving the operating time of lubricating oil, reducing the maintenance frequency of low-temperature medium pump;Specifically, the utility model utilizes the communication of bearing chamber 3 and inner cylinder body 6, and the temperature of inner cylinder body 6 is improved to heat exchange with the air entering outer cylinder body 5, to improve the temperature of air to realize the liquefaction of water in air, wherein, when higher humidity air enters between outer cylinder body 5 and inner cylinder body 6, the inner wall of outer cylinder body 5 is contacted by air, and the water in part of air is liquefied, further, when passing through communication hole 7, the water in air is liquefied by contacting high-temperature gas from bearing chamber 3;The liquid phase after the above liquefaction enters between inner cylinder body 6 and outer cylinder body 5 by the action of its gravity, and when the amount of condensate is too large, it can be exhausted through liquid discharge hole;When condensate does not need to be exhausted, the rubber plug 8 cooperates with the liquid discharge hole, to avoid that external air directly enters between inner cylinder body 6 and outer cylinder body 5.

[0023] Further, the top of the inner cylinder body 6 is an inner cylinder cover 9 with a slope structure. By the above setting, the high-humidity air directly contacts the top of the inner cylinder cover 9, causing most of the moisture to liquefy, and the liquefied liquid phase enters between the inner cylinder body 6 and the outer cylinder body 5 for temporary storage through the slope structure.

[0024] Further, the upper part of the inner cylinder cover 9 is connected to the inner wall of the top of the outer cylinder body 5. By the above setting, the strength of the gas condensation exhaust unit structure can be improved to achieve long-term stable operation of the utility model.

[0025] Further, the aperture of the communication hole 7 is φ1.5mm, which is uniformly distributed on the upper part of the inner cylinder body 6 and is arranged in two rows. The above arrangement has the following purposes: 1. The communication hole 7 arranged on the upper part of the inner cylinder body 6 can increase the amount of stored liquefied condensate and reduce the workload of the operator; 2. The amount of air entering the bearing chamber 3 can be increased while the moisture in the air is liquefied, so as to meet the needs of normal operation of the centrifugal pump body 1.

[0026] Further, the communication hole 7 is at an angle of 120° with the center line of the inner cylinder body 6. In the utility model, the lower hole of the communication hole 7 is arranged downward, and the lower hole edge is chamfered and smoothed. The above design can make the condensate better enter between the inner cylinder body 6 and the outer cylinder body 5.

[0027] Further, the bearing chamber 3 is provided with an integral limiting ring plate 10 on the outer circumference of the corresponding inner cylinder body 6. In the utility model, the bearing chamber 3 and the inner cylinder body 6 are connected by threads, and the limiting ring plate 10 can realize the tight fixing between the two; further, when the condensate is discharged from the drain hole, the condensate can be prevented from penetrating between the bearing chamber 3 and the inner cylinder body 6.

[0028] Further, the angle between the inner cylinder cover 9 and the horizontal plane is 45°. Through the above arrangement, the condensate at the top of the inner cylinder cover 9 can quickly enter between the inner cylinder body 6 and the outer cylinder body 5 for temporary storage.

[0029] The working principle of the utility model is as follows: the temperature of the air outside the gas condensation and discharge unit is lower than the temperature inside the gas condensation and discharge unit, and the temperature inside the gas condensation and discharge unit is lower than the temperature inside the bearing chamber 3; in the specific use process, the air with high humidity enters between the outer cylinder body 5 and the inner cylinder body 6 through the breathing cap 4, and contacts the surface of the inner cylinder cover 9 at the top of the inner cylinder body 6. Most of the water vapor in the air is liquefied into condensate at this point, and enters between the inner cylinder body 6 and the outer cylinder body 5 for temporary storage through the structure at the top of the inner cylinder cover 9. The air contacting the top of the inner cylinder cover 9 then contacts the inner wall of the outer cylinder body 5, and part of the water vapor in the air is liquefied. Further, the water vapor is liquefied by contacting the high-temperature gas from the bearing chamber 3 through the communication hole 7. The above-mentioned liquid phase enters between the inner cylinder body 6 and the outer cylinder body 5 for temporary storage by the action of its own gravity. When the amount of condensate is too large, it can be discharged outside through the drain hole. When the condensate does not need to be discharged, the rubber plug 8 cooperates with the drain hole to prevent the external air from directly entering between the inner cylinder body 6 and the outer cylinder body 5.

[0030] The standard parts used in this application document can all be purchased from the market and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field, which is common knowledge in this field. In addition, the utility model is mainly used to protect mechanical devices, so the utility model no longer explains the control method and circuit connection in detail. The peripheral controller mentioned in the specification can play a control role for the electrical components mentioned in this article, and the peripheral controller is a conventional known device.

[0031] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0032] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the scope of protection of the present utility model.

Claims

1. A breathing apparatus for a cryogenic centrifugal pump, comprising a centrifugal pump body (1), a pump shaft (2) on the centrifugal pump body (1) being fitted in a bearing chamber (3), characterized in that: A gas condensate discharge unit is arranged between the top of the bearing chamber (3) and the breathing cap (4); The gas condensate discharge unit at least comprises an outer cylinder (5) and an inner cylinder (6) arranged at a lower central position in the outer cylinder (5); the outer top middle position of the outer cylinder (5) is provided with the breathing cap (4); the inner cylinder (6) penetrates the bottom of the outer cylinder (5) and is connected with the top of the bearing chamber (3); a plurality of upwardly inclined communication holes (7) are arranged on the cylinder wall of the inner cylinder (6) in the outer cylinder (5); A drain hole with a rubber plug (8) is arranged on the bottom of the outer cylinder (5) corresponding to the outer side of the inner cylinder (6).

2. A breathing apparatus for a cryogenic centrifugal pump according to claim 1, characterized in that: The top of the inner cylinder (6) is a slope-shaped inner cylinder cover (9).

3. A breathing apparatus for a cryogenic centrifugal pump according to claim 2, characterized in that: The upper part of the inner cylinder cover (9) is connected with the inner wall of the top of the outer cylinder (5).

4. A breathing apparatus for a cryogenic centrifugal pump according to claim 1, characterized in that: The aperture of the communication hole (7) is φ1.5mm; the communication holes (7) are uniformly distributed on the periphery of the upper part of the inner cylinder (6) and are arranged in two rows.

5. A breathing apparatus for a cryogenic centrifugal pump according to claim 1 or 4, characterized in that: The communication hole (7) and the center line of the inner cylinder (6) form an included angle of 120°.

6. A breathing apparatus for a cryogenic centrifugal pump according to claim 1, characterized in that: A limit ring plate (10) with an integral structure is arranged on the outer circumference of the inner cylinder (6) corresponding to the upper part of the bearing chamber (3).

7. A breathing apparatus for a cryogenic centrifugal pump according to claim 1 or 2 or 3, characterized in that: The included angle between the inner cylinder cover (9) and the horizontal plane is 45°.

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