Exhaust condensation trapping system of screw vacuum pump

Abstract

The utility model relates to an exhaust condensation trapping system of a screw vacuum pump. The exhaust condensation trapping system comprises a condenser and a condensate storage tank arranged below the condenser, the condenser comprises a condenser cylinder and an upper end cover, a U-shaped condensing tube bundle is arranged in the condenser cylinder, a flange opening connected with the U-shaped condensing tube bundle is formed in the top end of the condenser cylinder, and a connecting flange is arranged at the flange opening and used for connecting the condenser cylinder and the upper end cover; a partition plate is arranged between the connecting flange and the upper end cover and is vertically arranged on the connecting flange; the top end of the U-shaped condensing tube bundle is fixed on the connecting flange, and a plurality of baffle plates are uniformly arranged on the U-shaped condensing tube bundle; a condensate inlet / outlet is formed in the bottom of the condenser cylinder and is connected with a condensate storage tank; and a liquid level meter is arranged at a high liquid level and a low liquid level in the condensate storage tank. According to the utility model, the exhaust emission of the screw vacuum pump is reduced, the noise of the screw vacuum pump is reduced, and the environmental pollution is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust condensation of screw vacuum pumps, and particularly relates to an exhaust condensation and trapping system for a screw vacuum pump. Background Art

[0002] A screw vacuum pump is an oil-free dry vacuum pump. There is no working fluid or lubricating oil in its cavity, and a pair of screw rotors inside do not contact or rub against each other. Therefore, its power consumption is relatively low. It has obvious energy-saving and emission-reduction effects, almost no vulnerable parts, and has the advantages of good reliability without maintenance and stable performance. Currently, it is widely used in processes that require pumping special gases in industries such as chemical engineering, pharmaceuticals, microelectronics, semiconductors, lithium batteries, and solar energy, such as industries dealing with harmful, toxic, explosive, corrosive, and dusty gases.

[0003] When a screw vacuum pump is used in the above processes, it will generate a certain amount of waste gas. Especially during the processes of organic solvent concentration and solidification drying in the chemical engineering, pharmaceutical, and lithium battery industries. Since the screw vacuum pump operates under high vacuum conditions, due to the different physical properties of the gases being pumped, many toxic and harmful gases being pumped cannot be cooled by low temperature or deep low temperature under high vacuum. In order to reduce the emission of waste gas from the screw vacuum pump, a condenser is usually installed at the exhaust port of the screw vacuum pump. The structure of this condenser is relatively simple. Usually, one or two groups of cooling coils are arranged inside the condenser, and a refrigerant is introduced into the coils to condense the condensable toxic and harmful gases discharged from the screw vacuum pump. Since the structure of this condensation coil is too simple, the heat exchange between the gas and the condensation coil is not sufficient, the condensation effect is relatively poor, and a large amount of condensable waste gas is still discharged into the atmosphere, and it also has little effect on gas noise reduction. Additionally, there is a jacket cooling method, and this cooling method has an even worse effect. The heat exchange time between the discharged gas and the jacket is short, and the condensation and trapping of condensable gases cannot be achieved. Summary of the Invention

[0004] The purpose of the utility model is to overcome the above deficiencies and provide an exhaust condensation and trapping system for a screw vacuum pump, which can reduce the waste gas emission of the screw vacuum pump, reduce the noise of the screw vacuum pump, and effectively reduce environmental pollution.

[0005] The purpose of the utility model is achieved as follows:

[0006] An exhaust condensation trapping system for a screw vacuum pump, which comprises a condenser and a condensate storage tank arranged below the condenser; the condenser includes a condenser cylinder body and an upper end cover, a U-shaped condensation tube bundle is arranged inside the condenser cylinder body, a flange port connected to the U-shaped condensation tube bundle is arranged at the top end of the condenser cylinder body, and a connecting flange is arranged at this flange port for connecting the condenser cylinder body and the upper end cover; a partition plate is arranged between the connecting flange and the upper end cover, and the partition plate is vertically arranged on the connecting flange; the top end of the U-shaped condensation tube bundle is fixed on the connecting flange, and a plurality of baffle plates are evenly arranged on the U-shaped condensation tube bundle; a lower part on one side of the condenser cylinder body is provided with an air inlet, and an upper part on the other side is provided with an exhaust port; a condensate inlet and outlet is arranged at the bottom of the condenser cylinder body, and the condensate inlet and outlet is connected to the condensate storage tank; a liquid level gauge is arranged for the high and low liquid levels in the condensate storage tank.

[0007] Further, the partition plate divides the space between the upper end cover and the connecting flange into left and right parts, a cooling water outlet is arranged on the upper end cover of the left part, and a cooling water inlet is arranged on the upper end cover of the right part.

[0008] Further, the baffle plate is a circular plate with a notch at one end, the outer diameter of the circular plate is the same as the inner diameter of the condenser cylinder body, the notch size of the baffle plate is not greater than the space between the edge of the U-shaped condensation tube bundle and the inner wall of the condenser cylinder body, and the notches of the plurality of baffle plates are arranged alternately left and right.

[0009] Further, a liquid discharge port is arranged at the bottom surface of the condensate storage tank, and the liquid discharge port is connected to a liquid discharge solenoid valve.

[0010] Further, a manhole is arranged at the top surface of the condensate storage tank for cleaning.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The present utility model can effectively reduce the exhaust gas emissions of the screw vacuum pump, and can reduce the mechanical vibration and air flow crosstalk noise generated by the screw vacuum pump at a relatively high discharge pressure, and can effectively reduce the failure rate of the screw vacuum pump; the baffle plate can reduce the flow rate of the gas in the condenser, extend the heat exchange time between the gas and the condensation tube bundle, improve the condensation efficiency of the exhaust gas, so as to reduce the emission of harmful substances in the exhaust gas and reduce the environmental pollution caused by the exhaust gas emissions of the vacuum pump. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of the present utility model.

[0014] Wherein:

[0015] Condenser 1, U-shaped condensate tube bundle 2, baffle 3, cooling water outlet 4, cooling water inlet 5, partition 6, air inlet 7, exhaust port 8, condensate inlet and outlet 9, condensate storage tank 10, drain solenoid valve 11, drain port 12, level gauge 13, manhole 14. Embodiment

[0016] To better understand the technical solution of the present utility model, the following will be described in detail in conjunction with relevant drawings. It should be understood that the following specific embodiments are not intended to limit the specific implementation modes of the technical solution of the present utility model, but only the implementation modes that can be adopted by the technical solution of the present utility model. It should be noted first that the expressions regarding the positional relationships of each component herein, such as component A is located above component B, are based on the relative positions of each component in the drawings and are not intended to limit the actual positional relationships of each component. Embodiment 1

[0017] See Figure 1 , Figure 1 , a structural schematic diagram of the present utility model is drawn. As shown in the figure, an exhaust condensation trapping system of a screw vacuum pump includes a condenser 1 and a condensate storage tank 10 provided below the condenser 1; the condenser 1 includes a condenser cylinder body and an upper end cover, and the condenser cylinder body and the upper end cover are connected by a connecting flange. A U-shaped condensate tube bundle 2 is provided in the condenser cylinder body, and a flange port connected to the U-shaped condensate tube bundle 2 is provided at the top of the condenser cylinder body, and a connecting flange is provided at this flange port for connecting the condenser cylinder body and the upper end cover;

[0018] A partition 6 is provided between the connecting flange and the upper end cover, and the partition 6 is vertically provided in the middle of the connecting flange. The partition 6 divides the space between the upper end cover and the connecting flange into left and right parts. A cooling water outlet 4 is provided on the upper end cover of the left part, and a cooling water inlet 5 is provided on the upper end cover of the right part;

[0019] The top of the U-shaped condensate tube bundle 2 is fixed on the connecting flange. Four baffle plates 3 are evenly arranged on the U-shaped condensate tube bundle 2. The baffle plates 3 are circular plates with a notch at one end. The outer diameter of the circular plate is the same as the inner diameter of the condenser cylinder body. The notch size of the baffle plate 3 is not greater than the space between the edge of the U-shaped condensate tube bundle 2 and the inner wall of the condenser cylinder body. The notches of the four baffle plates 3 are arranged alternately left and right; the baffle plates 3 can make the condensed gas flow in an S-shaped meandering manner, so that the flow path of the condensed gas is extended, the condensation time is increased, and the condensation efficiency is improved.

[0020] The condenser cylinder body is installed in a vertical structure, with an air inlet 7 provided at the lower part of one side and an exhaust port 8 provided at the upper part of the other side; a condensate inlet and outlet 9 is provided at the bottom of the condenser cylinder body, and the condensate inlet and outlet 9 is connected to the condensate storage tank 10.

[0021] The condensate storage tank 10 is a horizontal structure, and a liquid level gauge 13 is provided for high and low liquid levels. A hand hole 14 is provided on the top surface of the condensate storage tank 10 for cleaning. A drain port 12 is provided on the bottom surface of the condensate storage tank 10, and the drain port 12 is connected to a drain solenoid valve 11.

[0022] Working principle:

[0023] The utility model discloses a screw vacuum pump exhaust condensation collection system, comprising a condenser and a condensate recovery tank, wherein the condenser comprises a condenser cylinder, a U-shaped condensate tube bundle, a baffle plate, etc.; the condenser cylinder is a hollow cylindrical structure, and the upper end of the condenser cylinder is provided with a flange port, an air inlet, an air outlet, and a condensate outlet connected to the U-shaped condensate tube bundle; the U-shaped condensate tube bundle comprises a U-shaped condensate tube bundle and a head, a partition plate, a cooling water inlet, a cooling water outlet, etc.; four baffle plates are cross-fixed on the condensate tube bundle, respectively, and the baffle plate is a circular plate with the same size as the inner diameter of the condenser, and 1 / 8 of the area of ​​the circular plate needs to be removed to form a gap, and the adjacent baffle plate gaps are 180° alternately and symmetrically distributed as follows: Figure 1 As shown, the notch is used to guide the exhausted gas to return between the condenser bundle tubes, which can improve the full condensation of the exhausted condensable gas and reduce the exhaust noise of the screw pump; the condenser is arranged in a vertical installation structure, the air inlet is arranged on one side of the lower part of the condenser, and the air outlet is located on the other side of the upper part of the condenser. The condensate outlet is arranged at the bottom of the condenser, and the condensate outlet flange is directly connected to the condensate collector inlet flange.

[0024] The condensate collection tank is set at the lower end of the condenser, and the condenser drain port is directly connected to the condensate collection tank through a flange. The condensate in the condenser directly enters the condensate collection tank through the connecting pipe. The condensate collection tank is generally arranged horizontally, and it consists of a tank body, a hand hole, a liquid inlet, a liquid drain port, a liquid drain solenoid valve, and a liquid level gauge with high and low liquid level control. When the liquid level of the condensate in the condensate collection tank reaches a certain height, the system will automatically open the liquid drain solenoid valve to drain the liquid. When the liquid level reaches the low level, the liquid drain solenoid valve will close and automatically stop draining.

[0025] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. An exhaust condensation and trapping system for a screw vacuum pump, characterized in that: it includes a condenser (1) and a condensate storage tank (10) arranged below the condenser (1); the condenser (1) includes a condenser cylinder body and an upper end cover, a U-shaped condensation tube bundle (2) is arranged inside the condenser cylinder body, a flange port connected to the U-shaped condensation tube bundle (2) is arranged at the top end of the condenser cylinder body, and a connecting flange is arranged at the flange port for connecting the condenser cylinder body and the upper end cover; a partition plate (6) is arranged between the connecting flange and the upper end cover, and the partition plate (6) is vertically arranged on the connecting flange; the top end of the U-shaped condensation tube bundle (2) is fixed on the connecting flange, and a plurality of baffle plates (3) are uniformly arranged on the U-shaped condensation tube bundle (2); an air inlet (7) is arranged at the lower part of one side of the condenser cylinder body, and an exhaust port (8) is arranged at the upper part of the other side; a condensate inlet and outlet (9) is arranged at the bottom of the condenser cylinder body, and the condensate inlet and outlet (9) is connected to the condensate storage tank (10); a liquid level gauge (13) is arranged for the high and low liquid levels in the condensate storage tank (10).

2. The exhaust condensation and trapping system for a screw vacuum pump according to claim 1, characterized in that: the partition plate (6) divides the space between the upper end cover and the connecting flange into left and right parts, a cooling water outlet (4) is arranged on the upper end cover of the left part, and a cooling water inlet (5) is arranged on the upper end cover of the right part.

3. The exhaust condensation and trapping system for a screw vacuum pump according to claim 1, characterized in that: the baffle plate (3) is a circular plate with a notch at one end, the outer diameter of the circular plate is the same as the inner diameter of the condenser cylinder body, the notch size of the baffle plate (3) is not larger than the space between the edge of the U-shaped condensation tube bundle (2) and the inner wall of the condenser cylinder body, and the notches of the plurality of baffle plates (3) are arranged alternately left and right.

4. The exhaust condensation and trapping system for a screw vacuum pump according to claim 1, characterized in that: a liquid discharge port (12) is arranged at the bottom surface of the condensate storage tank (10), and the liquid discharge port (12) is connected to a liquid discharge solenoid valve (11).

5. The exhaust condensation and trapping system for a screw vacuum pump according to claim 1, characterized in that: a manhole (14) is arranged at the top surface of the condensate storage tank (10) for cleaning.

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