Differential pressure alarm device of normal-pressure closed ring main unit

Abstract

The utility model belongs to the technical field of ring main units, and particularly relates to a pressure difference alarm device for a normal-pressure closed ring main unit, which comprises an outer shell, a U-shaped pipe is mounted in the outer shell, two ends of the U-shaped pipe are respectively communicated with a filter and a constant-pressure tank, kerosene is filled in the U-shaped pipe, and the filter is communicated with the constant-pressure tank. A low-voltage photoelectric sensor and an overpressure photoelectric sensor are installed on one side of the U-shaped pipe on the upper side and the lower side of the liquid level of kerosene located on one side of the filter correspondingly, the low-voltage photoelectric sensor and the overpressure photoelectric sensor are electrically connected with a controller, and the controller is electrically connected with a sound alarm. The controller and the sound alarm are installed on the outer shell, and the controller comprises a relay and a single-chip microcomputer. The internal and external pressure difference change of the ring main unit is directly reflected through the physical principle that the liquid level heights at the two ends of the U-shaped pipe are affected by pressure, complicated electronic equipment is not needed, and the cost is reduced; high-precision monitoring is achieved through the photoelectric sensor, the response speed is high, and the alarm accuracy and timeliness are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of ring main unit, concretely relates to normal pressure closed ring main unit pressure difference alarm device. BACKGROUND

[0002] The design intention of normal pressure closed ring main unit is to prevent external pollution and humid air from invading while maintaining the internal environment relatively stable, so as to protect the internal electrical components from damage. This design makes the ring main unit maintain the internal pressure basically consistent with the external atmospheric pressure during normal operation, that is, the so-called "normal pressure" state. However, when the external environmental air pressure changes, such as encountering extreme weather conditions (such as typhoon, heavy rain, etc.) or natural air pressure difference in high altitude areas, a significant pressure difference may occur between the inside and outside of the ring main unit.

[0003] This pressure difference not only affects the sealing performance of the ring main unit, causing the sealing elements (such as sealing rings, gaskets, etc.) to be damaged due to uneven stress, but also may cause internal electrical component failure or performance degradation. For example, when the external air pressure decreases, the relatively high pressure inside the ring main unit may force the sealing elements to expand outward, even leading to sealing failure; while when the external air pressure increases, although the pressure on the sealing elements increases, the electrical components inside the ring main unit may be damaged due to bearing additional pressure, especially for those sensitive to pressure changes, such as pressure sensors, gas relays, etc.

[0004] Currently, for the monitoring and alarm of ring main unit pressure difference, there are some solutions on the market, but most of them have problems such as high cost, complex operation, slow response speed, etc. For example, some high-end ring main units are equipped with pressure sensors and complex control systems, although they can monitor the internal pressure in real time and send alarm signals, but the high cost limits their widespread application. UTILITY MODEL CONTENTS

[0005] In view of the above problems, the purpose of the utility model is to provide a normal pressure closed ring main unit pressure difference alarm device, which solves the problem that the monitoring means for ring main unit pressure difference in the prior art is mostly complex and costly, and lacks a simple, reliable and economical pressure difference alarm device.

[0006] The utility model discloses a technical scheme for realizing the above object: normal pressure closed looped netowrk cabinet pressure difference alarm device, including the shell body, the inside installation of shell body has the U type pipe, the both ends of U type pipe are linked with filter and constant pressure tank respectively, the U type pipe is filled with kerosene, and the liquid level of kerosene at filter one side's both sides of U type pipe is installed low voltage photoelectric sensor and overpressure photoelectric sensor respectively, low voltage photoelectric sensor, overpressure photoelectric sensor electric connection controller, the controller electric connection sound alarm, the controller, sound alarm are installed on the shell body, and the controller includes relay and singlechip.

[0007] The utility model discloses the beneficial effect that: through the physical principle of the liquid level height of both ends of U type pipe change under pressure influence direct reflection looped netowrk cabinet internal and external pressure difference change, need not complex electronic equipment, reduce the cost, utilize photoelectric sensor to realize high accuracy monitoring, response speed is fast, improve the accuracy and timeliness of alarm.

[0008] In order to effectively guarantee overpressure photoelectric sensor, low voltage photoelectric sensor's detection accuracy,

[0009] As the further improvement of the above technical scheme: the overpressure photoelectric sensor, low voltage photoelectric sensor are installed in the inside of shell body, and the optical axis of overpressure photoelectric sensor, low voltage photoelectric sensor is perpendicular to the axis of the axis of U type pipe.

[0010] The beneficial effect of the improvement is that the overpressure photoelectric sensor and low voltage photoelectric sensor installed in the inside of the shell body can avoid the influence of external ambient light, which leads to inaccurate detection structure.

[0011] In order to avoid kerosene leakage into the filter and constant pressure tank during transportation of the device,

[0012] As the further improvement of the above technical scheme: the valve is installed between the both ends of the U type pipe and the filter and constant pressure tank.

[0013] The beneficial effect of the improvement is that when transporting the device, the operator can close the valve to effectively prevent kerosene from leaking into the filter and constant pressure tank.

[0014] In order to avoid the dust from the outside into the U type pipe affecting the detection effect of the device,

[0015] As the further improvement of the above technical scheme: the filter is provided with an air inlet, and the filter outside the air inlet is provided with a filter screen.

[0016] The beneficial effect of the improvement is that the foreign matter in the external air can be filtered through the filter screen to avoid the foreign matter from entering the inside of the U type pipe and affecting the detection effect of the device.

[0017] In order to further improve the stability of the filter in use;

[0018] As a further improvement of the above technical solution: the air inlet is arranged on the bottom surface of the filter.

[0019] The air inlet arranged on the bottom surface of the filter can avoid the inflow of external water into the interior of the filter.

[0020] In order to accurately control the internal pressure of the constant pressure tank;

[0021] As a further improvement of the above technical solution: the constant pressure tank is provided with a pressure gauge.

[0022] The operator can obtain the internal pressure information of the constant pressure tank through the pressure gauge.

[0023] In order to accurately control the internal pressure of the constant pressure tank;

[0024] As a further improvement of the above technical solution: the constant pressure tank is provided with a pressure regulating valve.

[0025] The operator can control the internal pressure of the constant pressure tank by discharging part of the gas through the pressure regulating valve when the internal pressure of the constant pressure tank is too high.

[0026] The parts not involved in the device are the same as or can be realized by the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a front view of the utility model;

[0028] Figure 2 It is a structural schematic view of the utility model;

[0029] Figure 3 It is a front view of the shell in the utility model;

[0030] In the drawing: 1, shell; 11, overpressure photoelectric sensor; 12, low pressure photoelectric sensor; 13, controller; 14, sound alarm; 2, U-shaped tube; 21, kerosene; 3, filter; 31, air inlet; 32, filter screen; 4, constant pressure tank; 41, pressure gauge; 42, pressure regulating valve; 5, valve. DETAILED DESCRIPTION

[0031] In order to make the skilled in the art better understand the technical solutions of the present application, the present application will be 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 present application.

[0032] Example 1:

[0033] AsFigure 1 The utility model provides an ordinary pressure closed loop net cabinet pressure difference alarm device as shown in 3: ordinary pressure closed loop net cabinet pressure difference alarm device, the inside installation of shell body 1 is installed with U type pipe 2, the both ends of U type pipe 2 are communicated with filter 3 and constant pressure tank 4 respectively, U type pipe 2 is filled with kerosene 21, the upper and lower sides of the liquid level of kerosene 21 on the filter 3 side U type pipe 2 one side is installed with low pressure photoelectric sensor 12 and overpressure photoelectric sensor 11 respectively, low pressure photoelectric sensor 12, overpressure photoelectric sensor 11 electric connection controller 13, controller 13 electric connection sound alarm 14, controller 13, sound alarm 14 are installed on shell body 1, controller 13 includes relay and singlechip, and the physical principle of the liquid level height of both ends of U type pipe being influenced by pressure changes is directly reflected the pressure difference change in loop net cabinet, does not need complex electronic equipment, reduces the cost, realizes high precision monitoring by photoelectric sensor, response speed is fast, improves the accuracy and timeliness of alarm, overpressure photoelectric sensor 11, low pressure photoelectric sensor 12 are installed in the inside of shell body 1, the optical axis of overpressure photoelectric sensor 11, low pressure photoelectric sensor 12 is perpendicular to the axis of U type pipe 2, and overpressure photoelectric sensor 11, low pressure photoelectric sensor 12 installed in the inside of shell body 1 can avoid being influenced by external environment light, lead to the inaccuracy of detection structure, valve 5 is installed between both ends of U type pipe 2 and filter 3, constant pressure tank 4, when transporting the device, the operator can close valve 5, effectively avoid kerosene 21 from leaking into filter 3 and constant pressure tank 4, the air inlet 31 is set up on filter 3, and filter screen 32 is installed on the outside of filter 3 of air inlet 31, and the foreign matter in external air can be filtered through filter screen 32, avoid the foreign matter to enter the inside of U type pipe 2 and influence the detection effect of device, the air inlet 31 is set up on the bottom surface of filter 3, and the air inlet 31 set up on the bottom surface of filter 3 can avoid that external water body flows into the inside of filter 3, the pressure gauge 41 is installed on constant pressure tank 4, and the operator can obtain the internal pressure information of constant pressure tank 4 through pressure gauge 41, the pressure regulating valve 42 is installed on constant pressure tank 4, and when the internal pressure filled in constant pressure tank 4 is too high, the operator can release part of gas through pressure regulating valve 42 and control the internal pressure of constant pressure tank 4.

[0034] The working principle of the technical solution is as follows: according to the internal pressure of the ring net cabinet, compressed air is injected into the inside of the constant pressure tank 4, so that the internal pressure of the constant pressure tank 4 is kept the same as the internal pressure of the ring net cabinet. The internal pressure of the constant pressure tank 4 can be observed through the pressure gauge 41, and the internal pressure of the constant pressure tank 4 can be adjusted through the pressure regulating valve 42; ensure that the outer shell 1 is installed on a horizontal stable support surface, open the valve 5, and make the external air, the constant pressure tank 4 and the two ends of the U-shaped pipe 2 communicate. In the initial state, the liquid level of kerosene 21 at both ends of the U-shaped pipe 2 is the same; when the external environment pressure decreases, because the internal pressure of the constant pressure tank 4 remains unchanged, the liquid level of kerosene 21 near the filter 3 side of the U-shaped pipe 2 rises due to the decrease of external pressure, and the light path of the low pressure photoelectric sensor 12 is blocked. After the controller 13 receives the signal, the low pressure alarm is issued by the sound alarm 14; on the contrary, when the external environment pressure increases, the liquid level of kerosene 21 near the filter 3 side of the U-shaped pipe 2 decreases, and the light path of the overpressure photoelectric sensor 11 is no longer blocked by kerosene 21. The controller 13 also controls the sound alarm 14 to issue an overpressure alarm.

[0035] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0036] The principles and embodiments of the application are described herein by specific examples, and the above examples are only used to help understand the method and core idea of the application. The above description is only the preferred embodiment of the application. It should be noted that due to the limitation of language expression, there are infinite specific structures objectively. For ordinary skilled persons in the technical field, without departing from the principles of the application, some improvements, refinements or changes can be made, or the above technical features can be combined in a proper way; these improvements, refinements, changes or combinations, or the application of the concept and technical solution of the application to other fields without improvement, shall be regarded as the protection scope of the application.

Claims

1. The differential pressure alarm device for the normal pressure closed loop network cabinet, characterized in that: The utility model provides a kind of kerosene pressure control device, including outer shell (1), the inside of outer shell (1) is equipped with U-shaped pipe (2), the both ends of U-shaped pipe (2) are communicated with filter (3) and constant pressure tank (4) respectively, U-shaped pipe (2) is filled with kerosene (21), the upper and lower sides of the liquid level of kerosene (21) on the side of filter (3) U-shaped pipe (2) is equipped with low pressure photoelectric sensor (12) and overpressure photoelectric sensor (11) respectively, low pressure photoelectric sensor (12), overpressure photoelectric sensor (11) are electrically connected controller (13), controller (13) is electrically connected sound alarm (14), controller (13), sound alarm (14) are installed on outer shell (1), and controller (13) includes relay and single-chip microcomputer.

2. The differential pressure alarm device for the normal-pressure sealed ring main unit according to claim 1, characterized in that: The utility model discloses a kind of overpressure photoelectric sensor (11), low pressure photoelectric sensor (12), and the optical axis of overpressure photoelectric sensor (11), low pressure photoelectric sensor (12) is perpendicular to the axis of U-shaped pipe (2) through the axis of optical axis.

3. The differential pressure alarm device for the normal pressure sealed ring main unit according to claim 1, characterized in that: Valve (5) is installed between the both ends of U-shaped pipe (2) and filter (3), constant pressure tank (4).

4. The differential pressure alarm device for the normal-pressure sealed ring main unit according to claim 1, characterized in that: Air inlet (31) is formed in filter (3), and filter screen (32) is installed on the outside of air inlet (31) of filter (3).

5. The differential pressure alarm device for the normal pressure sealed ring main unit according to claim 4, characterized in that: Air inlet (31) is formed in the bottom surface of filter (3).

6. The differential pressure alarm device for the normal pressure sealed ring main unit according to claim 1, characterized in that: Pressure gauge (41) is installed on constant pressure tank (4).

7. The differential pressure alarm device for the normal pressure sealed ring main unit according to claim 1, characterized in that: Pressure regulating valve (42) is installed on constant pressure tank (4).

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