Positive pressure ventilation purging assembly of positive pressure motor

Abstract

The utility model discloses a positive pressure ventilation purging assembly of a positive pressure motor, which comprises an air source piece, the positive pressure motor, an air supply main pipeline and an air supply bypass, the air supply main pipeline is provided with an air inlet end and an air outlet end, the air inlet end of the air supply main pipeline is communicated with an air outlet of the air source piece, and the air outlet end of the air supply bypass is communicated with the air outlet of the air source piece. The air outlet end of the air supply main pipeline is communicated with the air inlet end of the positive pressure motor, the air supply bypass is provided with an air inlet end and an air outlet end, the air inlet end of the air supply bypass is communicated with the air outlet of the air source part, the air outlet end of the air supply bypass is communicated with the air inlet of the air source part, and the air outlet end of the air supply bypass is communicated with the air inlet of the air source part. And the air supply bypass is in a normally open state, so that when the air supply main pipeline has a leakage compensation fault, the air supply bypass can directly perform air leakage compensation on the interior of the positive pressure motor to ensure that the pressure intensity in the positive pressure motor is always greater than the external pressure intensity, so that the positive pressure motor can normally operate, and halfway shutdown of the equipment during operation is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of positive pressure motors, and in particular relates to a positive pressure ventilation and purge assembly of a positive pressure motor. Background Art

[0002] Before the positive pressure motor starts, the purge gas (nitrogen or inert gas) enters the motor cavity through the control unit, effectively replaces the original gas in the positive pressure motor cavity, and discharges the gas in the cavity from the top pressure relief valve. After the purge is completed, the pressure relief valve automatically closes, and the device will give a start signal, and the positive pressure motor enters the saturation and leakage compensation state (due to the large volume of the positive pressure motor and relatively more leakage points, the positive pressure motor directly enters the leakage compensation state), specifically, the structure disclosed in the document number CN203343119U "Pre-purge Positive Pressure Control System for Increased Safety Motor". During the operation of the motor, the pressure in the inner cavity of the positive pressure motor is always higher than the external pressure (at least 50Pa), preventing flammable gas from entering the shell. When the pressure is low or the pressure is lost, the normal leakage compensation cannot be guaranteed. The positive pressure ventilation system will give a signal. After receiving the signal, the PLC will automatically alarm or cut off the power supply of the motor. At this time, the positive pressure motor cannot operate normally, and the entire purge pipeline needs to be repaired, but this takes a long time, and the equipment stops halfway through operation, affecting the safe operation of the equipment. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a device with a simple structure, and when a compensation failure occurs in the main air supply line, the air supply bypass line can be used for compensation to ensure that the positive pressure motor will not stop midway, and the main air supply line can be maintained after the equipment stops running.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a positive pressure motor positive pressure ventilation and purge assembly, comprising an air source component, a positive pressure motor, an air supply main line and an air supply bypass line, the air supply main line having an air inlet end and an air outlet end, the air inlet end of the air supply main line is connected to the air outlet of the air source component, the air outlet end of the air supply main line is connected to the air inlet end of the positive pressure motor, the air supply bypass line having an air inlet end and an air outlet end, the air inlet end of the air supply bypass line is connected to the air outlet of the air source component, the air outlet end of the air supply bypass line is connected to the air inlet of the air source component, and the air supply bypass line is in a normally open state.

[0005] The beneficial effect of the above technical solution is that when a leakage compensation failure occurs in the main air supply line, the air supply bypass line can directly compensate for the leakage in the positive pressure motor to ensure that the pressure inside the positive pressure motor is greater than the external pressure, thereby allowing the positive pressure motor to operate normally and avoiding equipment shutdown during operation.

[0006] The air supply bypass passage in the above technical solution includes a bypass pipe and a pressure regulating valve and a flow regulator arranged in sequence and connected in series on the bypass pipe. One end of the bypass pipe is an air inlet end, and the other end is an air outlet end.

[0007] The beneficial effect of the above technical solution is that: its structure is simple, so that the gas pressure of the bypass pipe can be adjusted to avoid excessive pressure at the bypass pipe affecting the normal operation of the main gas supply line.

[0008] The air supply bypass passage in the above technical solution also includes a filter, and the filter is arranged on the bypass pipe at a position close to its air inlet end.

[0009] The beneficial effect of the above technical solution is that the filter can filter the airflow passing through the bypass pipe to prevent dirt from entering subsequent components and the positive pressure motor and affecting the normal operation of the equipment.

[0010] The air supply bypass passage in the above technical solution also includes a first pressure monitoring element, and the first pressure monitoring element is connected in series between the pressure regulating valve and the flow regulator.

[0011] The beneficial effect of the above technical solution is that the first pressure monitoring element can monitor the pressure value on the bypass pipe to determine whether the bypass pipe is operating normally.

[0012] In the above technical solution, both the air inlet and air outlet ends of the main air supply line and the air supply bypass line are provided with shut-off valves.

[0013] The beneficial effect of the above technical solution is that when the main gas supply line and the gas supply bypass line are operating normally, the shut-off valves are in a normally open state. When a fault occurs in the main gas supply line or the gas supply bypass line, the corresponding two shut-off valves can be closed for maintenance.

[0014] The above technical solution also includes a main box and a sub-box, the main air supply line is integrated in the main box, and the air supply bypass line is integrated in the sub-box.

[0015] The beneficial effect of the above technical solution is that the main gas supply line and the gas supply bypass line are separated from each other to facilitate independent maintenance in the later stage.

[0016] The gas stored in the gas source component in the above technical solution is nitrogen, compressed air, carbon dioxide or inert gas.

[0017] The beneficial effects of the above technical solution are: nitrogen, carbon dioxide and inert gases are non-flammable and non-combustible, and can provide good protection for the positive pressure motor, while compressed air has low cost and fills the inner cavity of the positive pressure motor with a pressure higher than the external atmospheric pressure, so that external flammable gases cannot enter the inner cavity of the motor.

[0018] The gas source component in the above technical solution is a gas storage cylinder.

[0019] The beneficial effect of the above technical solution is that it has a simple structure.

[0020] In the above technical solution, two air source components are provided, and the air outlets of the two air source components merge to form a total air outlet, and the air inlet end of the main air supply line and the air inlet end of the air supply bypass line are both connected to the total air outlet.

[0021] The beneficial effect of the above technical solution is that by providing two air source components, a redundant design can be formed to avoid insufficient air pressure in a single air source component affecting the normal operation of the equipment.

[0022] The above technical solution also includes a controller and an alarm. The air outlet of the air source is provided with an electric valve and a second pressure monitoring element. The electric valve, the second pressure monitoring element and the alarm are all electrically connected to the controller.

[0023] The beneficial effect of the above technical solution is that when the air pressure in any air source is insufficient, it can immediately switch to another air source to supply air, and the alarm device sends an alarm signal to timely add air to the air source with insufficient air pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a simplified structural diagram of the positive pressure motor positive pressure ventilation and purge assembly according to an embodiment of the utility model;

[0025] Figure 2 It is a schematic diagram of the case where the gas supply main line and the gas supply bypass line described in the embodiment of the utility model are provided with cut-off valves;

[0026] Figure 3 It is a schematic diagram of the structure in which the main air supply line and the bypass air supply line are respectively arranged in the main box body and the auxiliary box body in the embodiment of the utility model;

[0027] Figure 4 Another structural diagram of the positive pressure motor positive pressure ventilation and purge assembly of the utility model embodiment. In the figure: 1 air source; 11 electric valve; 12 second pressure monitoring element; 2 positive pressure motor; 3 main air supply line; 4 air supply bypass line; 41 bypass pipe; 42 pressure regulating valve; 43 flow regulator; 44 filter; 45 first pressure monitoring element; 5 main box; 6 auxiliary box; 7 controller; 8 alarm; 9 cut-off valve. DETAILED DESCRIPTION

[0028] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0029] like Figure 1 As shown, the present embodiment provides a positive-pressure motor positive-pressure ventilation and purge assembly, comprising an air source component 1, a positive-pressure motor 2, an air supply main line 3 and an air supply bypass line 4, wherein the air supply main line 3 has an air inlet end and an air outlet end, the air inlet end of the air supply main line 3 is connected to the air outlet of the air source component 1, the air outlet end of the air supply main line 3 is connected to the air inlet end of the positive-pressure motor 2, the air supply bypass line 4 has an air inlet end and an air outlet end, the air inlet end of the air supply bypass line 4 is connected to the air outlet of the air source component 1, the air outlet end of the air supply bypass line 4 is connected to the air inlet of the air source component 1, and the air supply bypass line 4 is in a normally open state, so that when a leakage compensation fault occurs in the air supply main line, the air supply bypass line can directly compensate for the leakage in the positive-pressure motor to ensure that the pressure in the positive-pressure motor is greater than the external pressure, so that the positive-pressure motor can operate normally and avoid equipment shutdown during operation.

[0030] Since the air supply flow rate of the air supply bypass passage is small, it cannot purge the positive pressure motor. However, when there is an air leakage in the positive pressure motor and the leakage compensation function of the air supply main passage 3 fails, the air supply flow rate of the air supply bypass passage is small, but it can continuously compensate for the air leakage in the positive pressure motor (of course, the air supply flow rate of the air supply bypass passage must still be slightly larger than the leakage flow rate of the positive pressure motor).

[0031] The air supply bypass passage 4 in the above technical solution includes a bypass pipe 41 and a pressure regulating valve 42 and a flow regulator 43 which are sequentially arranged and connected in series on the bypass pipe 41. One end of the bypass pipe 41 is an air inlet end, and the other end is an air outlet end. The structure is simple, so that the air pressure of the bypass pipe can be adjusted to avoid excessive pressure at the bypass pipe and affect the normal operation of the main air supply line.

[0032] The air supply bypass passage 4 in the above technical solution also includes a filter 44, which is arranged on the bypass pipe 41 near its air inlet end, so that the filter can filter the airflow passing through the bypass pipe to prevent stains from entering subsequent components and the positive pressure motor and affecting the normal operation of the equipment.

[0033] The air supply bypass passage 4 in the above technical solution also includes a first pressure monitoring element 45, and the first pressure monitoring element 45 is connected in series between the pressure regulating valve 42 and the flow regulator 43, so that the first pressure monitoring element can monitor the pressure value on the bypass pipe to determine whether the bypass pipe is operating normally.

[0034] like Figure 2 As shown, the air inlet and outlet ends of the main air supply line 3 and the air supply bypass line 4 in the above technical solution are both provided with a shut-off valve 9 (a manual valve may be used), so that when the main air supply line and the air supply bypass line are operating normally, the shut-off valves are both in a normally open state, and when the main air supply line or the air supply bypass line fails, the corresponding two shut-off valves can be closed for maintenance. The main air supply line 3 is similar to the structure disclosed in the document number CN203343119U "Pre-purge Positive Pressure Control System for Increased Safety Motors", which will not be described in detail here.

[0035] like Figure 3 As shown, the above technical solution also includes a main box body 5 and a sub-box body 6, the main air supply line 3 is integrated in the main box body 5, and the air supply bypass line 4 is integrated in the sub-box body 6, so that the main air supply line and the air supply bypass line are separated from each other for independent maintenance at a later stage.

[0036] The main box body and the auxiliary box body described in this embodiment both have a box door, a pipe inlet and a pipe outlet, and a lock needs to be provided at the box door to prevent accidental human operation. It belongs to a conventional structure and will not be described in detail here.

[0037] The gas stored in the air source component 1 described in the above technical solution is nitrogen, compressed air, carbon dioxide or inert gas, among which nitrogen, carbon dioxide and inert gas are non-flammable and non-combustible, and can provide good protection for the positive pressure motor. Compressed air has low cost and fills the inner cavity of the positive pressure motor with a pressure higher than the external atmospheric pressure, so that external flammable gases cannot enter the inner cavity of the motor.

[0038] The gas source component 1 in the above technical solution is a gas storage cylinder, which has a simple structure.

[0039] like Figure 4 As shown, in the above technical solution, two air source components 1 are provided, and the air outlets of the two air source components 1 merge to form a total air outlet, and the air inlet end of the air supply main line 3 and the air inlet end of the air supply bypass line 4 are both connected to the total air outlet. By providing two air source components, a redundant design can be formed to avoid insufficient air pressure in a single air source component affecting the normal operation of the equipment.

[0040] The above technical solution also includes a controller 7 and an alarm 8. The air outlet of the air source 1 is provided with an electric valve 11 and a second pressure monitoring element 12. The electric valve 11, the second pressure monitoring element 12 and the alarm 8 are all electrically connected to the controller 7. In this way, when the air pressure in any air source is insufficient, it can immediately switch to another air source for air supply, and the alarm sends an alarm signal to timely add air to the air source with insufficient air pressure. In this embodiment, the controller can be an arm series single-chip microcomputer, and the alarm can be an audible and visual alarm, a buzzer, etc. In this embodiment, the low pressure threshold of each air source can be set in advance in the controller, and when the pressure in the air source is lower than the low pressure threshold, the controller controls the corresponding electric valve 11 to close, and the alarm sends an alarm signal.

[0041] Of course, when the positive pressure motor is relatively large, the air source component may also be a larger air storage tank or directly use an air compressor.

[0042] The controller can be arranged in a control cabinet, and the alarm can be arranged on the top of the control cabinet.

[0043] Preferably, the second pressure monitoring element 12 is arranged between the corresponding electric valve and the air outlet of the air source component.

[0044] In this embodiment, the first pressure monitoring element and the second pressure monitoring element are both pressure gauges (digital pressure gauges may be used).

[0045] When the positive pressure motor described in the present embodiment is in operation, it is normally purged by the main air supply line, while the air supply bypass line is in a normally open state, and its air flow rate is lower than the flow rate when the main air supply line is purged. When the leakage compensation function of the main air supply line fails (such as caused by blockage, etc.), the air supply bypass line can replace the main air supply line to perform pressure compensation in the positive pressure motor, thereby ensuring that the positive pressure motor does not stop midway due to leakage.

[0046] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A positive pressure motor positive pressure ventilation and purge assembly, comprising an air source component (1), a positive pressure motor (2) and an air supply main line (3), wherein the air supply main line (3) has an air inlet end and an air outlet end, the air inlet end of the air supply main line (3) is connected to the air outlet of the air source component (1), and the air outlet end of the air supply main line (3) is connected to the air inlet end of the positive pressure motor (2), characterized in that: It also includes an air supply bypass passage (4), the air supply bypass passage (4) having an air inlet end and an air outlet end, the air inlet end of the air supply bypass passage (4) being connected to the air outlet of the air source component (1), the air outlet end of the air supply bypass passage (4) being connected to the air inlet of the air source component (1), and the air supply bypass passage (4) being in a normally open state.

2. The positive pressure motor positive pressure ventilation and purge assembly according to claim 1, characterized in that: The air supply bypass passage (4) comprises a bypass pipe (41) and a pressure regulating valve (42) and a flow regulator (43) which are sequentially arranged and connected in series on the bypass pipe (41); one end of the bypass pipe (41) is an air inlet end, and the other end is an air outlet end.

3. The positive pressure motor positive pressure ventilation and purge assembly according to claim 2, characterized in that: The air supply bypass passage (4) further comprises a filter (44), wherein the filter (44) is arranged on the bypass pipe (41) at a position close to the air inlet end thereof.

4. The positive pressure motor positive pressure ventilation and purge assembly according to claim 3 is characterized in that: The air supply bypass passage (4) further comprises a first pressure monitoring element (45), and the first pressure monitoring element (45) is connected in series between the pressure regulating valve (42) and the flow regulator (43).

5. The positive pressure motor positive pressure ventilation and purge assembly according to claim 1, characterized in that: The air inlet end and the air outlet end of the main air supply line (3) and the air supply bypass line (4) are both provided with a shut-off valve (9).

6. The positive pressure motor positive pressure ventilation and purge assembly according to claim 1, characterized in that: It also comprises a main box (5) and a sub-box (6), wherein the main air supply line (3) is integrated in the main box (5), and the air supply bypass line (4) is integrated in the sub-box (6).

7. The positive pressure motor positive pressure ventilation and purge assembly according to claim 6, characterized in that: The gas stored in the gas source component (1) is nitrogen, compressed air, carbon dioxide or inert gas.

8. The positive pressure motor positive pressure ventilation and purge assembly according to claim 7, characterized in that: The gas source component (1) is a gas storage cylinder.

9. The positive pressure motor positive pressure ventilation and purge assembly according to claim 7, characterized in that: Two air source components (1) are provided, and the air outlets of the two air source components (1) merge to form a total air outlet, and the air inlet end of the main air supply path (3) and the air inlet end of the air supply bypass path (4) are both connected to the total air outlet.

10. The positive pressure motor positive pressure ventilation and purge assembly according to claim 7, characterized in that: It also includes a controller (7) and an alarm (8), the gas outlet of the gas source component (1) is provided with an electric valve (11) and a second pressure monitoring element (12), and the electric valve (11), the second pressure monitoring element (12) and the alarm (8) are all electrically connected to the controller (7).

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