阅读说明：本技术 一种水泵自动排气装置 (Automatic exhaust device of water pump ) 是由 李纪玺 柳兵 陈义东 李伦 于 2019-11-18 设计创作，主要内容包括：本发明公开了一种水泵自动排气装置,具体包括一排气阀,一第一连接件,一第二连接件,一液位传感器和一控制器。通过本技术方案,能够实现对水泵运行工况的进一步监控,同时进一步有效地降低了因气体聚集从而导致装置发生损坏的风险,此外该种自动化排气装置还具备自动化程度高、性能可靠、结构简易、易组装易推广的优势。(The invention discloses an automatic exhaust device of a water pump, which particularly comprises an exhaust valve, a first connecting piece, a second connecting piece, a liquid level sensor and a controller. Through this technical scheme, can realize the further control to water pump operating condition, thereby further reduced simultaneously effectively and lead to the device to take place the risk of damaging because of gas gathering, this kind of automatic exhaust apparatus still possesses the advantage that degree of automation is high, dependable performance, structure are simple and easy, the easy popularization of easy equipment in addition.)

1. The utility model provides a water pump automatic exhaust device, is applied to the water pump, the water pump includes an exhaust port and a switch board, the switch board is used for controlling the operating condition of water pump, its characterized in that, water pump automatic exhaust device set up in exhaust port department specifically includes:

the exhaust valve comprises an air suction hole and an air exhaust hole and is used for exhausting the air in the water pump;

the first connecting piece comprises a main pipe and a branch pipe communicated with the main pipe, and one end of the main pipe is connected with the air suction hole through a first connecting pipe;

one end of the second connecting piece is connected with the exhaust port, and the other end of the second connecting piece is connected with the other end of the main pipe through a second connecting pipe;

the liquid level sensor is connected with the branch pipe and is used for detecting whether the liquid level in the main pipe reaches a preset liquid level or not and outputting a corresponding detection electric signal;

a controller, set up in the switch board and electricity connect level sensor with discharge valve, according to detect the signal of telecommunication, work as liquid level in the main pipe does not reach when predetermineeing the liquid level, control discharge valve continues to carry out exhaust work and control the water pump stop work.

2. The automatic exhaust device of a water pump as claimed in claim 1, wherein the exhaust valve is an automatic exhaust valve;

the automatic exhaust valve is preset with a pressure threshold, and when the internal gas pressure of the water pump exceeds the preset pressure threshold, the automatic exhaust valve starts to work.

3. The automatic exhaust device of a water pump as claimed in claim 1, wherein the exhaust valve is an electrically controlled exhaust valve;

and the electric control exhaust valve works according to the control signal of the controller.

4. The automatic water pump air bleed as in claim 1 further comprising a first pressure sensor and a second pressure sensor;

the first pressure sensor is arranged in the water pump, electrically connected with the control end and used for detecting the water inlet pressure of the water pump and outputting a water inlet pressure value;

the second pressure sensor is arranged in the water pump, electrically connected with the control end and used for detecting the water outlet pressure of the water pump and outputting a water outlet pressure value;

the controller is according to detect the signal of telecommunication the pressure value of intaking with go out the water pressure value, work as liquid level in the main pipe does not reach predetermine the liquid level just it is not zero just to intake the pressure value go out the water pressure value and be zero, control discharge valve continuously carries out exhaust work and control the water pump stop work.

5. The automatic water pump exhaust device as claimed in claim 1, wherein the first connecting pipe comprises a DN15 monofilament and a short pipe, one end of the DN15 monofilament is fixedly connected with one end of the short pipe, and the other end of the DN15 monofilament is fixedly connected with the air suction hole in a threaded manner.

6. The automatic water pump exhaust as claimed in claim 1, wherein the second connecting tubing comprises a first angled connection and a second angled connection;

one end of the first inclined connecting pipe is fixedly connected with the second connecting piece, and the other end of the first inclined connecting pipe is in a wedge-shaped section;

one end of the second inclined connecting pipe is fixedly connected with the first connecting piece, and the other end of the second inclined connecting pipe is matched with and fixedly connected with the other end of the first inclined connecting pipe.

7. The automatic water pump exhaust as claimed in claim 1, wherein the second connecting tube is a flexible sealing hose;

the first connector is secured by an external bracket.

8. The automatic air exhausting device of a water pump as claimed in claim 1, wherein the liquid level sensor is a photoelectric liquid level sensor, and comprises a photoelectric detection device arranged at the front end of the liquid level sensor and an indicator light arranged at the rear end of the liquid level sensor;

the photoelectric detection device is electrically connected with the indicator light.

9. A control method of a water pump automatic exhaust apparatus, characterized by being applied to the water pump automatic exhaust apparatus as set forth in claim 1, and comprising:

step A1, the liquid level sensor continuously detects the liquid level height in the main pipe, and judges whether the liquid level height reaches a preset liquid level:

if yes, returning to the step A1;

if not, go to step A2;

step A2, a controller controls a water pump to stop working, and simultaneously controls an exhaust valve to continuously perform exhaust work until the liquid level sensor detects that the liquid level height reaches the preset liquid level;

and step A3, the controller controls the water pump to work and simultaneously returns to the step A1.

10. A control method of a water pump automatic exhaust apparatus, characterized by being applied to the water pump automatic exhaust apparatus as set forth in claim 4, and comprising:

step B1, the liquid level sensor continuously detects the liquid level height in the main pipe, and judges whether the liquid level height reaches a preset liquid level; and

first pressure sensor and second pressure sensor continuously detect the pressure of intaking and the play water pressure of water pump respectively, judge the pressure value of intaking and play water pressure value and whether be zero:

if the liquid level height reaches the preset liquid level, the water inlet pressure value is not zero, and the water outlet pressure value is zero, turning to step B2;

if the liquid level height does not reach the preset liquid level, and/or the water inlet pressure value is zero, and/or the water outlet pressure value is not zero, returning to the step B1;

step B2, the controller controls the water pump to stop working, and controls the exhaust valve to continuously perform exhaust work at the same time until the liquid level sensor detects that the liquid level height reaches the preset liquid level;

and B3, controlling the water pump to work by the controller, and returning to the step B1.

Technical Field

The invention relates to the field of water service equipment accessories, in particular to an automatic exhaust device of a water pump.

Background

During the use of the water pump, gas accumulation is one of the main factors which may affect the use condition of the water pump: the gas in the pipe network system causes the gas to flow along with water flow to the water pump body, so that cavitation is generated to damage the water pump body; when gas is at the district level in the water pump, also probably can burn mechanical seal to cause the condition such as water pump leakage, the visible gas gathering has great harm to the service condition of water pump from this.

At present, the common function is to add an automatic suction and exhaust valve on the water inlet pipe section of the water pump, and automatically open the suction and exhaust valve to exhaust when the gas pressure exceeds the preset threshold of the suction and exhaust valve. But a large error exists in the detection of the gas accumulation condition by singly depending on the suction and exhaust valves; meanwhile, when the exhaust speed of the suction and exhaust valve is lower than the gas gathering speed, the water pump is still easily damaged, so that a safer and more effective exhaust structure with a simple structure is needed to be arranged in each water pump device.

Disclosure of Invention

To the above-mentioned problem that exists among the prior art, now provide a water pump automatic exhaust apparatus, concrete technical scheme is as follows:

the utility model provides a water pump self-bleeding device, is applied to the water pump, and this kind of water pump includes an exhaust port and a switch board, and the switch board is used for controlling the operating condition of water pump, and water pump self-bleeding device sets up in exhaust port department, specifically includes:

the exhaust valve comprises an air suction hole and an air exhaust hole and is used for exhausting the air in the water pump;

the first connecting piece comprises a main pipe and a branch pipe communicated with the main pipe, and one end of the main pipe is connected with the air suction hole through a first connecting pipe;

one end of the second connecting piece is connected with the exhaust port, and the other end of the second connecting piece is connected with the other end of the main pipe through a second connecting pipe;

the liquid level sensor is connected with the branch pipe and used for detecting whether the liquid level in the main pipe reaches a preset liquid level or not and outputting a corresponding detection electric signal;

the controller is arranged in the control cabinet and electrically connected with the liquid level sensor and the exhaust valve, and controls the exhaust valve to continuously perform exhaust work and control the water pump to stop working when the liquid level in the main pipe does not reach a preset liquid level according to a detection electric signal.

Preferably, the water pump automatic exhaust device is characterized in that the exhaust valve is an automatic exhaust valve;

the automatic exhaust valve is preset with a pressure threshold value, and when the internal gas pressure of the water pump exceeds the preset pressure threshold value, the automatic exhaust valve starts to work.

Preferably, the water pump automatic exhaust device is characterized in that the exhaust valve is an electric control exhaust valve;

the electric control exhaust valve works according to the control signal of the controller.

Preferably, the automatic air exhaust device of the water pump further comprises a first pressure sensor and a second pressure sensor;

the first pressure sensor is arranged in the water pump, electrically connected with the control end and used for detecting the water inlet pressure of the water pump and outputting a water inlet pressure value;

the second pressure sensor is arranged in the water pump, electrically connected with the control end and used for detecting the water outlet pressure of the water pump and outputting a water outlet pressure value;

the controller is according to detecting signal of telecommunication, the pressure value of intaking and the pressure value of going out water, and when the liquid level in the main pipe did not reach preset liquid level and the pressure value of intaking is nonzero and the pressure value of going out water is zero, control discharge valve and continue to carry out exhaust work and control the water pump stop work.

Preferably, the first connecting pipe comprises a DN15 single-thread head and a short pipe, one end of the DN15 single-thread head is fixedly connected with one end of the short pipe, and the other end of the DN15 single-thread head is fixedly connected with the air suction hole in a threaded connection mode.

Preferably, the water pump automatic exhaust device, wherein the second connecting pipe comprises a first inclined connecting pipe and a second inclined connecting pipe;

one end of the first inclined connecting pipe is fixedly connected with the second connecting piece, and the other end of the first inclined connecting pipe is in a wedge-shaped section;

one end of the second inclined connecting pipe is fixedly connected with the first connecting piece, and the other end of the second inclined connecting pipe is matched and fixedly connected with the other end of the first inclined connecting pipe.

Preferably, the second connecting pipe is a bendable sealing hose;

the first connector is secured by an external bracket.

Preferably, the automatic exhaust device of the water pump is characterized in that surface threads are arranged near the front end of the liquid level sensor;

the inner wall of the branch pipe is provided with threads matched with the liquid level sensor, and the liquid level sensor and the branch pipe are fixedly connected in a threaded connection mode.

Preferably, the water pump automatic exhaust device, wherein the liquid level sensor is a photoelectric liquid level sensor, and comprises a photoelectric detection device arranged at the front end of the liquid level sensor and an indicator light arranged at the rear end of the liquid level sensor;

the photoelectric detection device is electrically connected with the indicator light.

A control method of a water pump automatic exhaust device is applied to the water pump automatic exhaust device and comprises the following steps:

step A1, the liquid level sensor continuously detects the liquid level height in the main pipe, and judges whether the liquid level height reaches a preset liquid level:

if yes, returning to the step A1;

if not, go to step A2;

step A2, the controller controls the water pump to stop working, and controls the exhaust valve to continuously perform exhaust work at the same time until the liquid level sensor detects that the liquid level height reaches a preset liquid level;

and step A3, the controller controls the water pump to work and simultaneously returns to the step A1.

A control method of a water pump automatic exhaust device is applied to the preferable water pump automatic exhaust device and comprises the following steps:

step B1, the liquid level sensor continuously detects the liquid level height in the main pipe, and judges whether the liquid level height reaches a preset liquid level; and

first pressure sensor and second pressure sensor continuously detect the pressure of intaking and the play water pressure of water pump respectively, judge the pressure value of intaking and play water pressure value and whether be zero:

if the liquid level height reaches the preset liquid level, the water inlet pressure value is not zero and the water outlet pressure value is zero, turning to step B2;

if the liquid level height does not reach the preset liquid level, and/or the water inlet pressure value is zero, and/or the water outlet pressure value is not zero, returning to the step B1;

step B2, the controller controls the water pump to stop working, and controls the exhaust valve to continuously perform exhaust work at the same time until the liquid level sensor detects that the liquid level height reaches a preset liquid level;

and step B3, the controller controls the water pump to work and simultaneously returns to the step B1.

This technical scheme has following advantage or beneficial effect:

through this technical scheme, can realize the further control to water pump operating condition, thereby further reduced simultaneously effectively and lead to the device to take place the risk of damaging because of gas gathering, this kind of automatic exhaust apparatus still possesses the advantage that degree of automation is high, dependable performance, structure are simple and easy, the easy popularization of easy equipment in addition.

Drawings

FIG. 1 is a schematic structural view of an automatic air exhausting device of a water pump according to the present invention;

fig. 2 is an exploded view of an automatic air exhausting device of a water pump according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

To the above-mentioned problem that exists among the prior art, now provide a water pump automatic exhaust apparatus, concrete technical scheme is as follows:

the utility model provides a water pump automatic exhaust apparatus, is applied to the water pump, and this kind of water pump includes an exhaust port and a switch board, and the switch board is used for controlling the operating condition of water pump, and water pump automatic exhaust apparatus sets up in exhaust port department, as shown in fig. 1-2, specifically includes:

an exhaust valve 1, including an air suction hole 11 and an air exhaust hole 12, for exhausting the air in the water pump;

a first connecting member 2 including a main tube 21 and a branch tube 22 communicating with the main tube 21, one end of the main tube 21 being connected to the suction hole 11 through a first connecting tube 23;

one end of the second connecting piece 3 is connected with the exhaust port, and the other end of the second connecting piece 3 is connected with the other end of the main pipe 21 through a second connecting pipe 31;

the liquid level sensor 4 is connected with the branch pipe 22 and is used for detecting whether the liquid level in the main pipe 21 reaches a preset liquid level or not and outputting a corresponding detection electric signal;

a controller 5 sets up in the switch board and electricity connection level sensor 4 and discharge valve 1, according to detecting the signal of telecommunication, when the liquid level in being responsible for 21 does not reach and predetermines the liquid level, controls discharge valve 1 and continuously carries out exhaust work and control water pump stop work.

A specific example is now provided to explain and explain the technical solution in detail:

in the first embodiment of the invention, the automatic exhaust device of the water pump comprises an exhaust valve 1, a first connecting piece 2, a second connecting piece 3, a liquid level sensor 4 and a controller 5, wherein the exhaust valve 1 is used for exhausting gas accumulated in the water pump; the first connecting piece 2 is a welded tee joint, the main pipe 21 is arranged in parallel in the vertical direction and is respectively connected with the automatic exhaust valve 1 and the second connecting piece 3 through a first connecting pipe 23 and a second connecting pipe 31, the branch pipe 22 is arranged perpendicular to the main pipe 21 and is connected with the main pipe 21, the liquid level sensor 4 is arranged through the branch pipe 22 and is used for detecting the liquid level of the water level in the main pipe 21, and when the water pump normally operates, the water level exceeds the detection surface of the liquid level sensor 4 according to the arrangement position of the first connecting piece 2; and when organism begins the gathering and surpasses certain safe operating threshold value in the water pump, the liquid level in the person in charge 21 can corresponding decline, when level sensor 4 can not detect the water level, it is in excess state promptly to mean that gas in the water pump, level sensor 4 sends the detection signal of telecommunication (being the switching value signal) to the controller 5 that sets up in the switch board this moment, controller 5 will judge according to detecting the signal of telecommunication, when the liquid level in the person in charge 21 does not reach level sensor's detection face, controller 5 sends the instruction of stopping the pump to the water pump and controls exhaust pump 1 and continuously keeps exhaust operating condition simultaneously, just so can realize the automated inspection and the control of water pump operating mode.

In the first embodiment, the detectable surface of the liquid level sensor 4 is a preset liquid level, and before the automatic air exhaust device of the water pump is arranged, the setting height of the first connecting piece 2 needs to be detected and determined in advance, as shown in fig. 1-2, the setting height of the first connecting piece 2 corresponds to the height of the horizontal liquid level which can be detected by the liquid level sensor 4. Particularly, the detectable surface of the liquid level sensor 4 needs to be set slightly higher than the liquid level corresponding to the safety threshold of the gas contained in the water pump during working, so that a certain space is reserved to ensure that the water pump does not generate excessive gas.

In the first embodiment, the whole operation condition of the water pump is controlled by the control cabinet, and the control cabinet inevitably contains at least one PLC control unit, and the controller 5 can be integrated in the PLC control unit of the control cabinet.

In a preferred embodiment, the water pump automatic exhaust device is characterized in that the exhaust valve 1 is an automatic exhaust valve;

the automatic exhaust valve is preset with a pressure threshold value, and when the internal gas pressure of the water pump exceeds the preset pressure threshold value, the automatic exhaust valve starts to work.

In a preferred embodiment of the present invention, the exhaust valve 1 is an automatic exhaust valve, which belongs to the prior art, and can open an automatic exhaust function when the collected gas in the water pump exceeds the design threshold of the automatic exhaust valve, and forms a double guarantee for the gas suction and exhaust in the water pump by cooperating with the liquid level sensor 4.

In a preferred embodiment, the water pump automatic exhaust device is characterized in that the exhaust valve 1 is an electric control exhaust valve;

the electric control exhaust valve works according to the control signal of the controller 5.

In another preferred embodiment of the present invention, the exhaust valve 1 is an electrically controlled exhaust valve, and is opened only after receiving a control signal from the controller 5 to perform the exhaust operation, which is more beneficial to the automatic electrical control than the automatic exhaust valve.

As a preferred embodiment, the automatic air exhaust device of the water pump further comprises a first pressure sensor and a second pressure sensor;

the first pressure sensor is arranged in the water pump, is electrically connected with the control end 5, and is used for detecting the water inlet pressure of the water pump and outputting a water inlet pressure value;

the second pressure sensor is arranged in the water pump, electrically connected with the control end 5 and used for detecting the water outlet pressure of the water pump and outputting a water outlet pressure value;

the controller 5 is according to detecting signal of telecommunication, the pressure value of intaking and the pressure value of going out water, and when the liquid level in being responsible for 21 did not reach and predetermines the liquid level and the pressure value of intaking is nonzero and the pressure value of going out water is zero, control discharge valve continuously carries out exhaust work and control water pump stop work.

Another specific embodiment is now provided to further explain and explain the technical solution specifically:

in the second embodiment of the present invention, different from the first embodiment, two pressure sensors are additionally arranged inside the water pump and new judgment conditions are correspondingly arranged, in addition to the arrangement of the liquid level sensor 4: the inside pressure sensor who additionally sets up of water pump is used for detecting the water pressure of intaking and the water pressure of going out of water pump respectively, when the water pressure of intaking is nonzero and the water pressure of going out is zero, it does not stop but the water of intaking of outside this moment to say, the water pump is in unusual operating mode state, if level sensor 4 sends the liquid level that the signal representation was responsible for 21 simultaneously also does not reach preset the liquid level this moment, then explain the excessive gas of exact gathering in the water pump this moment, need controller 5 to send corresponding instruction to make the water pump begin to stop pump self preservation and protect and exhaust. In the second embodiment, the pressure sensor is additionally arranged, so that the water pump is stopped only when three judgment conditions are met, and the damage to other aspects caused by sudden start and stop of the water pump in a short time due to misjudgment can be avoided to a certain extent.

As a preferred embodiment, the automatic air exhausting device of the water pump is shown in fig. 2, wherein the first connecting pipe 23 comprises a DN15 single-thread head 231 and a short pipe 232, one end of the DN15 single-thread head 231 is fixedly connected with one end of the short pipe 232, and the other end of the DN15 single-thread head 231 is fixedly connected with the air suction hole 11 by a threaded connection.

In another preferred embodiment of the present invention, the first connecting tube 23 comprises a DN15 monofilament 231 and a short tube 232, as shown in fig. 1-2, wherein two ends of the short tube 232 are fixedly connected to the DN15 monofilament 231 and the first connecting member 2, respectively, by welding, so as to enhance the overall structural strength and sealing performance of the exhaust structure; and DN15 single thread 231 is connected with automatic exhaust valve 1 by screw thread connection, which is convenient for disassembly, inspection and maintenance of automatic exhaust valve 1 while maintaining sealing performance.

In a preferred embodiment, the automatic air exhaust device of the water pump is shown in fig. 1-2, wherein the second connecting pipe 31 comprises a first inclined connecting pipe 311 and a second inclined connecting pipe 312;

one end of the first inclined connecting pipe 311 is fixedly connected with the second connecting piece 3, and the other end of the first inclined connecting pipe 311 is in a wedge-shaped section;

one end of the second inclined connecting pipe 312 is fixedly connected with the first connecting piece 2, and the other end of the second inclined connecting pipe 312 is matched and fixedly connected with the other end of the first inclined connecting pipe 311.

In another preferred embodiment of the present invention, the second connecting pipe 31 is formed to extend obliquely sideways and then vertically upwards to avoid the outward extending and expanding appearance structure of the upper portion of the water pump, so as to prevent the occurrence of the setting interference situation, wherein the inclination angles of the first inclined connecting pipe 311 and the second connecting member 3 need to be set according to the overall shape of the water pump.

In a preferred embodiment, the water pump automatic exhaust device is provided, wherein the second connecting pipe 31 is a bendable sealing hose;

the first connecting member 2 is fixed by an external bracket.

In another preferred embodiment of the present invention, the second connecting tube 31 can be a flexible sealing hose to avoid the outward expansion of the upper part of the water pump, and the first connecting member 2 does not have a rigid tube for supporting and needs an external bracket for fixing.

In a preferred embodiment, the automatic air exhaust device of the water pump is shown in fig. 2, wherein a surface thread is arranged near the front end of the liquid level sensor 4;

the inner wall of the branch pipe 22 is provided with a thread matched with the liquid level sensor 4, and the liquid level sensor 4 and the branch pipe 22 are fixedly connected in a threaded connection mode.

In another preferred embodiment of the present invention, the level sensor 4 is connected to the branch pipe 22 by a screw connection, which facilitates the disassembly and inspection of the level sensor 4.

In a preferred embodiment, the water pump automatic exhaust device, wherein the liquid level sensor 4 is a photoelectric liquid level sensor, and comprises a photoelectric detection device arranged at the front end of the liquid level sensor 4 and an indicator lamp 41 arranged at the rear end of the liquid level sensor 4;

the photoelectric detection device is electrically connected with the indicator lamp 41.

In another preferred embodiment of the present invention, the liquid level sensor 4 is defined as a photoelectric liquid level sensor, which can further improve the accuracy of liquid level detection, the photoelectric detection device for detection is electrically connected to the indicator 41 disposed at the tail of the sensor, and when the liquid level is not detected, an electrical signal is sent to the indicator 41 to control the indicator 41 to light up, so that a user can more intuitively observe whether the operation condition of the water pump is problematic.

A control method of an automatic air exhaust device of a water pump is applied to the automatic air exhaust device of the water pump in the first embodiment, and includes:

step A1, the liquid level sensor continuously detects the liquid level height in the main pipe, and judges whether the liquid level height reaches a preset liquid level:

if yes, returning to the step A1;

if not, go to step A2;

step A2, the controller controls the water pump to stop working, and controls the exhaust valve to continuously perform exhaust work at the same time until the liquid level sensor detects that the liquid level height reaches a preset liquid level;

and step A3, the controller controls the water pump to work and simultaneously returns to the step A1.

A control method of an automatic air exhaust device of a water pump is applied to the automatic air exhaust device of the water pump in the second embodiment, and includes:

step B1, the liquid level sensor continuously detects the liquid level height in the main pipe, and judges whether the liquid level height reaches a preset liquid level; and

first pressure sensor and second pressure sensor continuously detect the pressure of intaking and the play water pressure of water pump respectively, judge the pressure value of intaking and play water pressure value and whether be zero:

if the liquid level height reaches the preset liquid level, the water inlet pressure value is not zero and the water outlet pressure value is zero, turning to step B2;

if the liquid level height does not reach the preset liquid level, and/or the water inlet pressure value is zero, and/or the water outlet pressure value is not zero, returning to the step B1;

step B2, the controller controls the water pump to stop working, and controls the exhaust valve to continuously perform exhaust work at the same time until the liquid level sensor detects that the liquid level height reaches a preset liquid level;

and step B3, the controller controls the water pump to work and simultaneously returns to the step B1.

To sum up, through this technical scheme, can realize the further control to water pump operating condition, thereby further reduced simultaneously effectively and lead to the device to take place the risk of damaging because of gas gathering, this kind of automatic exhaust apparatus still possesses the advantage that degree of automation is high, the dependable performance, the structure is simple and easy, the easy popularization of easy equipment in addition.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.