External liquid ring type vacuum pump deslagging device

Abstract

The utility model relates to a slag discharging device of a built-in liquid ring type vacuum pump, which belongs to the field of vacuum pump operation and is a device for supplementing the defects of the structure of the existing liquid ring pump, two open holes are formed in the compression side of a pump body and are respectively a pump body left open hole and a pump body right open hole, two open holes are formed in one side of an upper separator, and two open holes are formed in the other side of the upper separator and are respectively communicated with the pump body left open hole and the pump body right open hole. The left pump body opening and the right pump body opening are respectively connected with one end of a left slag discharge pipe and one end of a right slag discharge pipe, and the other end of the left slag discharge pipe and the other end of the right slag discharge pipe are respectively connected with the left separator opening and the right separator opening; the utility model relates to structural optimization of an application scene of a liquid ring vacuum pump / compressor (hereinafter referred to as a liquid ring pump), in particular to a place where a conveyed or compressed medium contains a large amount of dust, particulate matters, crystal substances and the like which are insoluble in a working solution and have higher density than the working solution.

Description

Technical Field

[0001] The utility model relates to a slag discharge device of a built-in liquid ring vacuum pump, belonging to the field of vacuum pump operation. Background Art

[0002] The design, manufacture and use of liquid ring pumps have a history of nearly a hundred years. Liquid ring vacuum pumps / compressors are widely used due to their simple structure, low manufacturing requirements, stable performance, reliable operation, easy maintenance, low noise, and large-scale manufacturing.

[0003] At present, there are only two main structural forms of liquid ring pumps in the world, namely single-acting and double-acting liquid ring pumps. The positions of the suction and exhaust ports of both are within the cavity range close to the axis position (within the liquid ring limit). Since the eccentric design requirements must be met (the working principle of the liquid ring pump), on the suction side, as the pump body and the hub that constrain the liquid gradually move away, the liquid ring is thrown out, the cavity changes from small to large, the pressure decreases, and the gas is introduced from the suction port set within the cavity range, thereby inhaling. On the compression side, as the pump body and the hub gradually approach each other, the cavity changes from large to small, and the pressure of the gas constrained therein increases. When it is greater than the external pressure, the gas is led out from the exhaust port located within the liquid ring interface range, thereby exhausting.

[0004] The pump body of the liquid ring vacuum pump and the disc (or end cover) at the end face of the impeller constitute the constraint mechanism of the liquid ring. The liquid ring rotates in the constraint mechanism driven by the impeller. The inner surface of the liquid ring periodically approaches or moves away from the hub. The liquid is always in the outer ring and the gas is in the inner ring. The suction and exhaust ports must be opened within the cavity range of the liquid ring interface. If the range is exceeded and the liquid overflows, the liquid ring becomes thinner, which will lead to insufficient suction and incomplete exhaust, thus affecting the efficiency of the pump, so it is not feasible.

[0005] Due to the above structural characteristics, welding slag accidentally introduced during the installation of the pump, dust and particles entering with the gas, sand entering with the working fluid, scale and crystals accumulated in the pump, and other solid substances with a density greater than the working fluid (hereinafter referred to as slag) cannot be discharged from the pump during operation. In many processes, the pump is required to work continuously for a long time. The wear of the pump body and disc by this part of the slag rotating at high speed with the liquid ring is inevitable. Some substances will also scale on the surface of the pump body and the disc, increasing the resistance to the rotation of the liquid ring and increasing power consumption. In particular, it continues to accumulate at the exhaust port, occupying the effective exhaust channel, resulting in poor exhaust, reduced gas volume, and increased motor power consumption. A large number of cases have proved that the reduced efficiency of the vacuum pump and the damage of components are closely related to the above situation. For example, in the processes of vacuum conveying of fly ash, vacuum conveying of sand, dry aluminum fluoride, catalyst regeneration in the PVC industry, vacuum casting, etc., the above situation exists in large quantities.

[0006] Even during the pump shutdown period, liquid ring pump damage is rarely discovered or resolved in the early stages due to personnel shortages, inadequate equipment management, unclear equipment damage, increased vacuum pump power consumption and slow decline in efficiency, and self-compensation of liquid ring pump parts after wear.

[0007] In view of the above situation, the more common solutions in the existing vacuum system are as follows: 1. Install a separation device or a blocking device at the entrance of the vacuum system according to the characteristics of the material, such as: a cyclone separator, a pulse bag dust collector, a vacuum buffer tank, a filter, a filter screen, etc. 2. Install a filter on the water supply side of the vacuum system, such as: a basket filter, a mesh filter, etc. 3. Open a flushing port at the lowest part of the pump body.

[0008] Although the above devices can solve some problems to a large extent, there are still many problems. The reasons are unreasonable setting of the filter device, inadequate equipment management, insufficient management personnel, insufficient experience, untimely replacement and cleaning of the filter device, and working conditions that do not allow. For example, in the fly ash transportation process in vacuum smelting, a pulse bag dust removal device is generally installed at the entrance of the system. However, due to the wide distribution of the particle size of the transported material, there are always dust particles smaller than the mesh of the filter cloth, bagging damage, and leakage of the sealing device. The density of this dust is greater than that of water. After enrichment in the pump, it aggregates into larger particles, causing damage to the pump. Another example: in the dry aluminum fluoride process, the inhaled hydrogen fluoride gas reacts with the alkali solution in the working fluid (added to neutralize the pH of the working fluid) to generate sodium fluoride crystals, which crystallize in the pump. The flushing port at the bottom of the vacuum pump has a small diameter, and the flushing effect is very limited by relying on the self-flow of the working fluid retained in the pump, and in many cases, the discharge of the working fluid is not allowed.

[0009] Therefore, it is inevitable that materials will enter the pump, resulting in efficiency loss and component damage. Disassembly and cleaning and component replacement are almost the only solutions, and the cost of downtime and component damage is huge. Utility Model Content

[0010] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0011] An external liquid ring vacuum pump slag discharge device comprises a pump body and a motor. Two openings are arranged on the compression side of the pump body, namely a left opening of the pump body and a right opening of the pump body. Two openings are arranged on one side of an upper separator, namely a left opening of the separator and a right opening of the separator. The left opening of the pump body and the right opening of the pump body are respectively connected to one end of a left slag discharge pipe and a right slag discharge pipe, and the other ends of the left slag discharge pipe and the right slag discharge pipe are respectively connected to the left opening of the separator and the right opening of the separator. A left valve is arranged on the left slag discharge pipe, and a right valve is arranged on the right slag discharge pipe.

[0012] As a further solution of the utility model: according to the process conditions, the slag discharge holes and corresponding pipeline valves can be increased or decreased to increase or decrease the slag discharge capacity.

[0013] As a further solution of the utility model: the slag discharge pipe can be connected to a side separator or directly discharged to a return water device such as a ditch.

[0014] As a further solution of the utility model: the slag discharge device can stop the slag discharge process by closing the slag discharge valve.

[0015] As a further solution of the utility model: the wall of the slag discharge hole can be reinforced with wear-resistant and corrosion-resistant materials.

[0016] As a further solution of the utility model: the slag discharge device can be connected to the filtering device as needed to extract or intercept the slag from entering other systems.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. Good durability and not easy to damage; there is no additional power device, all parts are stationary, so it is not easy to damage.

[0019] 2. Maintenance-free; there are only valves and pipelines, no wearing parts, so no maintenance is required.

[0020] 3. Good applicability; it can be started and stopped at any time according to the process conditions.

[0021] 4. Adjustability: According to the process changes, the valve opening can be controlled to adjust the discharge flow rate, thereby adjusting the slag discharge volume.

[0022] 5. Efficient separation, good effect; the working fluid drawn out from the pump body (outermost side of the liquid ring) has the maximum concentration of particles, so the separation efficiency is the highest.

[0023] 6. Minimum investment and maximum output; compared with the price of pump body, disc and impeller parts, the investment is negligible. Compared with the loss of production suspension and maintenance labor cost, the investment is also negligible. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the front view of the utility model;

[0025] Figure 2 It is the right view of the utility model;

[0026] Notes on the figure markings: 1. Left opening of separator; 2. Left slag discharge pipe; 3. Left valve; 4. Left opening of pump body; 5. Right opening of separator; 6. Right slag discharge pipe; 7. Right valve; 8. Right opening of pump body; 9. Upper separator; 10. Air inlet; 11. Pump body suction chamber; 12. Pump body compression chamber; 13. Pump body; 14. Motor. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] When drilling holes at different positions of the pump body 13 to measure the pressure exerted by the liquid ring on the inner surface of the pump body, we found that the pressure was different at different positions. The pressure was highest at the tip of the exhaust port (the part before the exhaust ends) and was much greater than the normal exhaust pressure.

[0029] Based on this discovery, our solution is: drill a hole on the compression side of the pump body 13, lead out a slag discharge pipe 2 and a slag discharge pipe 6 through welding or threaded connection, and install valves; then connect the pipes to the exhaust pipeline or the upper air-water separator or the side separator, so as to discharge the slag out of the pump; when the pump is working, open valve 3 and valve 7, that is, water flows out, and the water flow carries the slag out of the pump, and the working fluid is gradually purified. Close the valve group to cut off the slag discharge process.

[0030] Furthermore, two or more groups of channels can be opened on the pump body to meet the application requirements of places where slag enters continuously and in large quantities.

[0031] The utility model is provided with two openings on one side of the pump body 13, which are respectively a left opening 4 of the pump body and a right opening 8 of the pump body. Two openings are provided on one side of the upper separator 9, which are respectively a left opening 1 of the separator and a right opening 5 of the separator. The left opening 4 of the pump body and the right opening 8 of the pump body are respectively connected to one end of the left slag discharge pipe 2 and the right slag discharge pipe 6, and the other ends of the left slag discharge pipe 2 and the right slag discharge pipe 6 are respectively connected to the left opening 1 of the separator and the right opening 5 of the separator. The left slag discharge pipe 2 is provided with a left valve 3, and the right slag discharge pipe 6 is provided with a right valve 7.

[0032] The process method of realizing the self-flow of working fluid by utilizing the pressure difference based on that the exhaust liquid ring pressure in the pump body is greater than the exhaust port pressure is the result of in-depth research on the characteristics of liquid ring pumps.

[0033] The position, diameter and number of holes in the pump body are determined by the size of the pump, the type of slag, the effect of the holes on the strength of the pump body, etc. It includes single-acting liquid ring vacuum pumps (single-acting flat disc liquid ring vacuum pumps, single-acting cone liquid ring vacuum pumps), double-acting liquid ring vacuum pumps (double-acting flat disc liquid ring vacuum pumps, double-acting cone liquid ring vacuum pumps), liquid ring compressor products of the above structural forms (liquid ring vacuum pumps with variable uses), and deformed products of the above structural forms.

[0034] Part of the working fluid is extracted from the outermost layer of the liquid ring (i.e. the inner surface of the pump body) for discharge. The density of the slag is greater than that of the working fluid. Under the action of centrifugal force, the principle of centrifugal separation is used to extract the liquid with the highest slag content for discharge, which has the best slag discharge effect.

[0035] Since high-speed fluid with debris flowing through the opening will have a significant scouring effect on the wall of the aperture (the flow-facing surface), causing the aperture to expand (in the direction of fluid flow, similar to the wake effect), it is necessary to adopt measures such as sleeve wear-resistant materials, thickening the thickness of the hole wall (thickening the outer layer of the pump body) in advance to reinforce the pump body, while ensuring the strength of the pump body and extending the service life of the pump body.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slag discharge device of an external liquid ring vacuum pump, comprising a pump body (13) and a motor (14), wherein the output end of the motor (14) is connected to the pump body (13), characterized in that: The external liquid ring vacuum pump slag discharge device is composed of a left opening of a separator (1), a left slag discharge pipe (2), a left valve (3), a left opening of a pump body (4), a right opening of a separator (5), a right slag discharge pipe (6), a right valve (7), a right opening of a pump body (8), an upper separator (9), an air inlet (10), a pump suction chamber (11), and a pump compression chamber (12); Two openings are arranged on one side of the pump compression chamber (12) of the pump body (13), namely the left opening (4) of the pump body and the right opening (8) of the pump body. Two openings are arranged on one side of the upper separator (9), namely the left opening (1) of the separator and the right opening (5) of the separator. The left opening (4) of the pump body is connected to the left slag discharge pipe (2), the right opening (8) of the pump body is connected to the right slag discharge pipe (6), the left slag discharge pipe (2) is connected to the left opening (1) of the separator, and the right slag discharge pipe (6) is connected to the right opening (5) of the separator. The left slag discharge pipe (2) is provided with a left valve (3), and the right slag discharge pipe (6) is provided with a right valve (7). The pump body (13) is divided into a pump suction chamber (11) and a pump compression chamber (12) according to different functions.

2. The slag discharge device of an external liquid ring vacuum pump according to claim 1, characterized in that: The pump suction chamber (11) is connected to the air inlet (10).

3. The slag discharge device of an external liquid ring vacuum pump according to claim 1, characterized in that: The left opening (1) of the separator and the right opening (5) of the separator are distributed at the same level, and the left opening (4) of the pump body and the right opening (8) of the pump body are distributed at the same level.

4. The slag discharge device of an external liquid ring vacuum pump according to claim 1, characterized in that: The left slag discharge pipe (2) is connected to the upper separator (9) and the pump body (13), and the right slag discharge pipe (6) is connected to the upper separator (9) and the pump body (13).

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