阅读说明：本技术 进气排气装置 (Air inlet and exhaust device ) 是由 祝兴洋 于 2019-10-16 设计创作，主要内容包括：本发明属于热水器技术领域,具体涉及一种进气排气装置,通过将进气管道的出气端和排气管道的进气端分别连接在三通接头的第一接口和第三接口上,并且在进气管道和排气管道上分别设置第一阀门和第二阀门,同时在该三通接头的第二接口与热水器内胆的试压口之间连通中间管道,以使热水器内胆还处于水中时便可通过打开第二阀门的方式进行排气工作,即在保压结束后,热水器内胆开始上提时便可将热水器内胆中的气体从中间管道与排气管道排至空气中,有效的节约了试压测试时间,从而提高了热水器内胆的试压效率。(The invention belongs to the technical field of water heaters, and particularly relates to an air inlet and exhaust device, wherein an air outlet end of an air inlet pipeline and an air inlet end of an exhaust pipeline are respectively connected to a first connector and a third connector of a three-way joint, a first valve and a second valve are respectively arranged on the air inlet pipeline and the exhaust pipeline, and an intermediate pipeline is communicated between the second connector of the three-way joint and a pressure test port of a liner of a water heater, so that the water heater liner can perform exhaust work by opening the second valve when still in water, namely, after the pressure test is finished, gas in the liner of the water heater can be exhausted into the air from the intermediate pipeline and the exhaust pipeline when the liner of the water heater begins to lift up, so that the pressure test time of the liner of the water heater is effectively saved, and the pressure test efficiency of the liner of the water heater.)

1. An air inlet and exhaust device is used for pressure test of a water heater liner and is characterized by comprising a three-way joint, an air inlet pipeline, an intermediate pipeline, an exhaust pipeline, a first valve and a second valve;

the first connector of the three-way connector is communicated with the air outlet end of the air inlet pipeline, and the air inlet end of the air inlet pipeline is communicated with the gas generating device; the first valve is arranged on the air inlet pipeline;

a second interface of the three-way joint is communicated with one end of the middle pipeline, and the other end of the middle pipeline is communicated with a pressure test port of the water heater liner;

the third interface of the three-way joint is communicated with the air inlet end of the exhaust pipeline, the air outlet end of the exhaust pipeline is communicated with the outside air, and the second valve is arranged on the exhaust pipeline.

2. The intake-exhaust apparatus as claimed in claim 1, further comprising a controller;

the first valve and the second valve are both solenoid valves;

the controller is used for controlling the opening and closing of the first valve and the second valve according to preset conditions so as to sequentially carry out inflation, pressure maintaining and exhaust operations on the inner container of the water heater.

3. The intake-exhaust apparatus as claimed in claim 2, further comprising an input module, a first relay and a second relay;

the controller is a logic controller, and a first output end of the logic controller is electrically connected with the first valve through a first relay; a second output end of the logic controller is electrically connected with the second valve through a second relay;

the input module is in signal connection with the logic controller and is used for inputting working parameters for the logic controller.

4. The intake-exhaust apparatus as claimed in claim 3, wherein the input module is a touch display screen.

5. The intake-exhaust apparatus as claimed in claim 3, further comprising an activation button;

the starting button is in signal connection with the logic controller and is used for providing a starting signal for the logic controller.

6. The intake-exhaust apparatus according to any one of claims 1 to 5, further comprising a sound-deadening tank communicating with an outlet end of the exhaust pipe;

the silencing tank comprises a silencing tank body, and an air inlet hole and an air outlet hole which are arranged on the silencing tank body;

the air outlet end of the exhaust pipeline is communicated with the air inlet holes, and the number of the air outlet holes is multiple.

7. The intake-exhaust device as claimed in claim 6, wherein the silencing pot body is of a cubic structure;

the air inlet hole and the air outlet hole are respectively arranged on two opposite side walls of the silencing tank body.

8. The intake-exhaust device as claimed in claim 7, wherein at least 3 of the air outlets are spaced along the axial direction of the silencing pot body.

9. The intake-exhaust device as claimed in claim 7 or 8, wherein the intake holes are horizontally offset from each of the outlet holes.

10. Air inlet and outlet arrangement according to any of claims 1-5, characterised in that the outer wall of the intermediate pipe is provided with a protective jacket.

Technical Field

The invention relates to a water heater, in particular to an air inlet and exhaust device for a pressure test process of a water heater liner.

Background

The pressure test of the inner container of the water heater is necessary work for ensuring the quality of the water heater.

Generally, the inner container of the water heater comprises a container opening and an air inlet arranged on the side wall of the inner container, and the air inlet and the container opening are both closed under normal conditions. Before pressure testing, the air inlet is communicated with the air storage tank through an air inlet pipeline, and the liner opening is sealed through a liner plug. After the pressure test begins, open the valve on the admission line, let in the inner bag with the gas in the gas holder, after the preset time, close the valve, immerse the inner bag in the water tank that is equipped with water completely, carry out the pressurize, look over whether there is the bubble production in the aquatic. And after maintaining the pressure for a period of time, lifting the inner container out of the water tank, opening a plug of the inner container, and exhausting until the gas in the inner container is completely discharged to finish the pressure test of the inner container of the water heater.

However, in the pressure maintaining process of the water heater liner, the water heater liner is completely immersed in water, and the liner plug needs to be opened in the exhaust process so as to discharge the gas in the liner through the liner opening, if the gas is exhausted underwater, the gas can be directly discharged through the liner opening and generates a large impact force with water, so that the water in the water tank splashes around, therefore, the existing water heater liner pressure test needs to perform the exhaust operation on the water heater liner outside the water tank, which causes the time of the pressure test process to be long, thereby affecting the working efficiency; in addition, sharp noise is generated in the exhaust process, and the health of operators is seriously affected.

Disclosure of Invention

The present invention provides an air intake and exhaust apparatus that addresses, at least to some extent, the above and other potential problems in the art.

The invention provides an air inlet and exhaust device, which is used for pressure test of a water heater liner and comprises a three-way joint, an air inlet pipeline, an intermediate pipeline, an exhaust pipeline, a first valve and a second valve, wherein the three-way joint is connected with the air inlet pipeline; the first connector of the three-way connector is communicated with the air outlet end of the air inlet pipeline, and the air inlet end of the air inlet pipeline is communicated with the gas generating device; the first valve is arranged on the air inlet pipeline; a second connector of the three-way connector is communicated with one end of the middle pipeline, and the other end of the middle pipeline is communicated with a pressure test port of the water heater liner; the third interface of the three-way joint is communicated with the air inlet end of the exhaust pipeline, the air outlet end of the exhaust pipeline is communicated with the outside air, and the second valve is arranged on the exhaust pipeline.

In a preferred embodiment of the above intake and exhaust apparatus, the apparatus further comprises a controller; the first valve and the second valve are both solenoid valves; the controller is used for controlling the opening and closing of the first valve and the second valve according to preset conditions so as to sequentially carry out inflation, pressure maintaining and exhaust operations on the inner container of the water heater.

In the preferable technical scheme of the air intake and exhaust device, the air intake and exhaust device further comprises an input module, a first relay and a second relay; the controller is a logic controller, and a first output end of the logic controller is electrically connected with the first valve through a first relay; a second output end of the logic controller is electrically connected with the second valve through a second relay; the input module is in signal connection with the logic controller and is used for inputting working parameters for the logic controller.

In a preferred technical solution of the above air intake and exhaust apparatus, the input module is a touch display screen.

In a preferred technical scheme of the air intake and exhaust device, the air intake and exhaust device further comprises a starting button; the starting button is in signal connection with the logic controller and is used for providing a starting signal for the logic controller.

In a preferred technical solution of the above air intake and exhaust apparatus, the air intake and exhaust apparatus further includes a silencing pot communicated with an air outlet end of the exhaust pipe; the silencing tank comprises a silencing tank body, and an air inlet hole and an air outlet hole which are arranged on the silencing tank body; the air outlet end of the exhaust pipeline is communicated with the air inlet holes, and the number of the air outlet holes is multiple.

In the preferable technical scheme of the air inlet and exhaust device, the silencing tank body is of a cubic structure; the air inlet hole and the air outlet hole are respectively arranged on two opposite side walls of the silencing tank body.

In the preferable technical scheme of the air inlet and exhaust device, at least 3 air outlet holes are arranged at intervals along the axial direction of the silencing tank body.

In the preferable technical scheme of the air intake and exhaust device, the air inlet holes and the air outlet holes are arranged in a staggered manner in the horizontal direction.

In a preferred technical scheme of the above air intake and exhaust device, the first valve and the second valve are both sleeved with protective sleeves.

As can be understood by those skilled in the art, the air inlet and outlet device provided by the present invention is configured such that the air outlet end of the air inlet pipe and the air inlet end of the air outlet pipe are respectively connected to the first connector and the third connector of the three-way joint, and a first valve and a second valve are respectively arranged on the air inlet pipeline and the exhaust pipeline, and an intermediate pipeline is communicated between a second interface of the three-way joint and a pressure test port of the water heater liner, so that the pressure test of the inner container of the water heater is carried out in the air inlet stage, the second valve is closed, the first valve is opened, thereby conveying the gas in the gas generating device to the inner container of the water heater through the gas inlet pipeline and the middle pipeline, after the air inflation is finished, the first valve is closed, the water heater liner is immersed in water for pressure maintaining, after the pressure maintaining is finished, the second valve is opened, and the gas in the water heater liner is discharged after passing through the silencing tank through the intermediate pipeline and the exhaust pipeline. Above-mentioned exhaust apparatus admits air can make the water heater inner bag alright carry out exhaust work when still being in aqueous, for example, after the pressure holding, when the water heater inner bag begins to lift alright arrange the gas in the water heater inner bag to the air from intermediate duct and exhaust duct, the effectual pressure testing time of having practiced thrift to the pressure testing efficiency of water heater inner bag has been improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an intake and exhaust device according to an embodiment of the present invention;

FIG. 2 is a schematic view of the construction of the sound-damping tank of FIG. 1;

fig. 3 is a schematic structural diagram of an intake and exhaust device according to a second embodiment of the present invention.

In the drawings:

101. 201-inner container of water heater;

1011. 2011-opening of inner container;

1012. 2012-plug;

1013. 2013-pressure test port;

102. 202-a three-way joint;

1021. 2021-first joint;

1022. 2022-a second joint;

1023. 2023-third joint;

103. 203-an air inlet duct;

104. 204-a first valve;

105. 205-a gas generating device;

106. 206-intermediate conduit;

107. 207-an exhaust duct;

108. 208-a second valve;

109. 209-a silencing tank;

1091-a sound-deadening tank body;

1092-air intake;

1092-air outlet holes;

210-a first relay;

211-a second relay;

212-a logic controller;

213-an input module;

214-start button.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.

In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Example one

Fig. 1 is a schematic structural diagram of an intake and exhaust device provided in the first embodiment. Referring to fig. 1, the air intake and exhaust device for the pressure test operation of the heater liner provided by the embodiment includes a three-way joint 102, an air intake pipe 103, an intermediate pipe 106, an exhaust pipe 107, a muffler tank 109, a first valve 104, and a second valve 108.

Specifically, the first interface 1021 of the three-way joint 102 is communicated with the air outlet end of the air inlet pipeline 103, and the air inlet end of the air inlet pipeline 103 is used for being communicated with the gas generating device 105 so as to convey the gas in the gas generating device 105 into the water heater liner 101 for pressure test. A first valve 104 is provided in the intake pipe 103, and opening or closing of the intake pipe 103 is performed by opening or closing the first valve 104. In practice, the gas generating device 105 may be a gas storage tank or an air generator, such as a compressed air storage tank, or an inert gas storage tank, wherein the inert gas in the inert gas storage tank may be nitrogen, helium, or the like.

The second interface 1022 of the three-way joint 102 is communicated with one end of the middle pipeline 106, and the other end of the middle pipeline 106 is communicated with the pressure test port 1013 of the water heater liner 101. The third port 1023 of the three-way joint 102 is communicated with the air inlet end of the exhaust pipeline 107, the air outlet end of the exhaust pipeline 107 is communicated with the outside air, and the second valve 108 is arranged on the exhaust pipeline 107 to realize the conduction or the closing of the exhaust pipeline 107. The pressure test port 1013 of the water heater liner 101 is generally an air inlet/outlet port of the water heater liner 101.

In this example, the air intake and the air exhaust of the water heater liner 101 during the pressure test both pass through the intermediate pipe 106, that is, the intermediate pipe 106 is a main pipe, and the air intake pipe 103 and the air exhaust pipe 107 are branch pipes, and are connected by the three-way joint 102, so as to respectively realize the air intake and the air exhaust.

Referring to fig. 1, the first valve 104 and the second valve 108 in this embodiment may be manual gate valves. An operator opens or closes the manual gate valve to complete the conduction and the closing of the air inlet pipeline 103 and the exhaust pipeline 107, so that the air inlet, pressure maintaining and exhaust operations of the water heater liner 101 in a pressure test are realized.

It is understood that the first valve 104 and the second valve 108 may also be pneumatic valves, hydraulic valves, etc. to allow the intake and exhaust conduits to be opened or closed by pneumatic or hydraulic control.

The pressure test process of the water heater liner 101 by adopting the air inlet and exhaust device of the embodiment is as follows:

first, after the air inlet and outlet device of the present embodiment is installed, the air outlet end of the air outlet duct 107 is led out to the outside of the water tank and is communicated with the outside air. The first valve 104 is opened, the second valve 108 is closed, the gas of the gas generating device 105 is sent into the water heater liner 101 through the gas inlet pipeline 103, the three-way joint 102 and the middle pipeline 106, after a period of time, the first valve 104 is closed, the water heater liner 101 is sunk into the water tank until the water heater liner 101 is completely immersed in the water, so that a pressure maintaining test is carried out, and an operator determines the air tightness of the water heater liner 101 by observing whether bubbles are generated in the water. After the pressure is maintained for a period of time, the second valve 108 is opened to conduct the exhaust pipe 107, and the gas in the water heater liner 101 is exhausted to the outside air through the middle pipe 106, the three-way joint 102 and the exhaust pipe 107. It will be appreciated that while venting, the water heater bladder 101 can be lifted up until the water heater bladder 101 is fully exposed to air. After the gas emission is completed, the pressure test of the water heater liner 101 is completed.

In the above pressure test, the liner port 1011 of the water heater liner 101 is in a sealed state. The lid 1011 can be sealed, for example, by a closure head 1012.

In the pressure test process of the water heater liner, the air inlet time can be controlled within 15-20 s. For example, the intake time may be 15s, 17s, 20s, or the like, which is not limited herein. The pressure maintaining time can be controlled within 20-25 s, so that the test result of the pressure test of the inner container of the water heater is more accurate.

Based on the above testing process, the air inlet and exhaust device of the embodiment can open the second valve 107 to exhaust air in the process of rising the water heater liner 101 after the pressure of the water heater liner 101 is maintained, so that the pressure testing time is effectively shortened, and the pressure testing efficiency of the water heater liner 101 is improved.

When the air inlet and exhaust pipeline of the embodiment is used for pressure test of the water heater liner 101, the air outlet end of the exhaust pipeline 107 is led out to the outside of the water tank and is communicated with the outside air.

Specifically, the air outlet end of the exhaust pipe 109 can be directly exposed to the outside air, i.e., the air in the water heater liner 101 is directly exhausted into the air.

In some examples, the air intake and exhaust device of the present embodiment includes a silencing tank 109, and the air outlet end of the exhaust pipe 107 is communicated with the silencing tank 109, so that noise generated in the exhaust process is buffered and absorbed by the silencing tank 109, thereby avoiding interference of sharp noise generated in the existing exhaust process to operators.

Fig. 2 is a schematic structural view of the sound-deadening tank of fig. 1. Referring to fig. 2, the sound-deadening tank 109 of the present embodiment includes a sound-deadening tank body 1091, and an air inlet hole 1092 and an air outlet hole 1093 provided on the sound-deadening tank body 1091. Wherein, the silencing tank body 1091 can be made of carbon steel.

Referring to fig. 1 and 2, specifically, the air outlet end of the exhaust pipe 107 is communicated with the air inlet hole 1092, so that the air in the water heater liner 101 is introduced into the silencing tank body 1091 with a large inner cavity size (the size can be designed by a person skilled in the art according to the noise volume to be reduced, and the specific design manner is not related to the present invention, specifically, please refer to the related prior art, which is not described herein again), and then buffered in the inner cavity of the silencing tank body 1091, and then discharged through the air outlet hole 1093. The provision of the sound-deadening tank body 1091 effectively reduces the flow rate of gas discharged through the exhaust pipe 107, thereby reducing the noise of gas discharge.

Meanwhile, a plurality of air outlets 1093 are formed in the silencing tank body 1091, so that the air entering the silencing tank body 1091 is dispersed and discharged through the air outlets 1093, and the noise of the air discharged from the silencing tank 109 is further reduced.

The structure of the silencing tank body 1091 of the present embodiment may be various. In some examples, the sound-damping can body 1091 is a cubic or rectangular parallelepiped structure. In other examples, the sound-damping tank body 1091 may also be a cylindrical structure. Of course, the silencing tank body 1091 may have other irregular three-dimensional structures, and the structure of the silencing tank body 1091 is not limited herein.

In addition, the volume of the sound-deadening tank body 1091 of the present embodiment is set to at least 1m³～2m³Like this, alright increase the difference between the internal diameter of amortization jar body 1091 and exhaust duct 107, increased the interior cavity of amortization jar body 1091 simultaneously and to the gaseous quantity of buffering of exhalant, and then optimized this amortization jar body 1091's noise cancelling effect, simultaneously, also ensure that this amortization jar 109 can not occupy too big workspace.When the design is specific, the volume of the silencing tank body 1091 can be 1m³、1.2m³、1.5m³、1.7m³And 2m³And the like.

Continuing to refer to fig. 2, when the silencing pot body 1091 of this embodiment is a cube structure, the air inlet holes 1092 and the air outlet holes 1093 provided on the silencing pot body 1091 are respectively provided on two opposite side walls of the silencing pot body 1091 to increase the distance between the air inlet holes 1092 and the air outlet holes 1093 in the silencing pot body 1091, so that the air discharged from the air outlet end of the exhaust channel 107 can be buffered for a period of time after entering the silencing pot body 1091 through the air inlet holes 1092, and then discharged through the air outlet holes 1093, thereby improving the buffering effect of the silencing pot 109 on the discharged air, and reducing the noise generated in the air discharging process.

Of the plurality of outlet holes 1093 on the side wall of the sound-deadening tank body 1091, at least 3 outlet holes 1093 are provided at intervals in the axial direction of this sound-deadening tank body 1091. For example, 3 ventholes 1093 are distributed at the top, middle and bottom of the side wall of the silencing pot body 1091, so that after the gas exhausted from the exhaust channel 107 enters the silencing pot body 1091, the buffer memory is performed in the inner cavity of the silencing pot body 1091, and then the gas is exhausted through the upper, middle and lower three ventholes 1093 respectively, so that the path of the gas is more dispersed, and the silencing effect of the silencing pot 109 is improved.

When specifically designing, the setting staggers in the horizontal direction of inlet port 1092 and every venthole 1093 to avoid getting into amortization jar body 1091 back through inlet port 1092, directly discharge through venthole 1093, thereby improve the buffer memory time of gas in amortization jar body 1091.

The air inlet hole 1092 and the air outlet hole 1093 on the silencing tank 109 can reduce the exhaust noise of the 80L water heater liner 101 to be lower than 85db, thereby avoiding the noise pollution to the working environment caused by the exhaust process of the pressure test of the water heater liner 101.

In this embodiment, the middle pipe 106 has dual functions of air inlet and air outlet, and therefore, the middle pipe 106 can be made of a hard rubber pipe to ensure the compressive strength of the middle pipe 106 and ensure the normal operation of the pressure test of the water heater liner 101. Thereby increasing the useful life of the intermediate conduit 106.

In addition, during the pressure maintaining process of the water heater liner 101 of the present embodiment, both the water heater liner 101 and a portion of the intermediate pipe 106 are immersed in water. Therefore, in order to prevent the intermediate pipe 106 from corroding the pipe wall due to long-term contact with water, the outer wall of the intermediate pipe 106 is provided with a protective sleeve in this embodiment, so as to prolong the service life of the intermediate pipe 106. The protective sleeve can be made of waterproof and anti-corrosion materials such as rubber.

In order to facilitate the assembly and disassembly of the air intake and exhaust device and the water heater inner container 101 in this embodiment, one end of the middle pipe 106 and the pressure test port 1013 of the water heater inner container 101 in this embodiment may be detachably connected, so as to facilitate the replacement of the water heater inner container 101.

Specifically, in some examples, an internal thread may be provided in the pressure test port 1013, and an external thread matching the internal thread may be provided at one end of the intermediate pipe 106, so that the one end of the intermediate pipe 106 is detachably connected to the pressure test port 1013 through the thread, and the connection mode also ensures the connection strength between the intermediate pipe 106 and the pressure test port 1013.

Based on the structural arrangement of the air inlet and exhaust device of the embodiment, as long as the middle pipeline 106 is connected with or detached from the pressure test port 1013, the pipeline for pressure test and the water heater liner 101 can be disassembled and assembled in one step, so that the disassembling and assembling efficiency between the pressure test device and the water heater liner 101 is improved.

In addition, one end of the middle pipe 106 can be detachably connected with the second interface 1022 of the three-way joint 102, so as to facilitate the assembly and disassembly between the middle pipe 106 and the three-way joint 102. For a specific connection manner, reference may be made to the connection manner between the intermediate pipe 106 and the pressure test port 1013, and details are not described here.

Example two

Fig. 3 is a schematic structural diagram of an intake and exhaust device according to the second embodiment. Referring to fig. 3, the present embodiment is different from the first embodiment in that the first valve 204 and the second valve 208 are both solenoid valves.

Specifically, this embodiment all sets up first valve 204 and second valve 208 to the solenoid valve, has improved the switching operating efficiency to first valve 204 and second valve 208, has further improved the switch-on and switch-off efficiency of pressure testing process to admission line 203 and exhaust duct 207 to the time of admitting air, pressurize and exhausting of whole pressure testing test process has been practiced thrift.

It should be noted that the solenoid valve adopted in this embodiment is a common solenoid valve in the prior art, and the specific structure thereof can be referred to the prior art, which is not described herein again.

In operation, when the solenoid valve serving as the first valve 204 needs to be opened, a power supply connected to the solenoid valve may supply current to the solenoid valve, so as to control the solenoid valve to open, thereby conducting the air inlet pipe 203. Conversely, the current is cut off, the solenoid valve closes, and the intake duct 203 closes.

Similarly, when it is desired to open the solenoid valve as the second valve 208, a current may be supplied to the solenoid valve through a power supply connected to the solenoid valve, so that the solenoid valve is opened and the exhaust pipe 207 is conducted. Conversely, the current is cut off, the solenoid valve closes, and the exhaust conduit 207 closes.

In this embodiment, the air intake and exhaust device further comprises a controller for controlling the opening and closing of the first valve 204 and the second valve 208 according to preset conditions so as to sequentially perform the operations of inflating, maintaining pressure and exhausting the water heater inner container 201. For example, the controller may be configured to incorporate an intake time, a pressure holding time, and an inflation time of the pressure test, so that the controller controls the opening and closing of the first valve 204 and the second valve 208 according to the intake time, the pressure holding time, and the inflation time, thereby implementing automatic switching of the intake, pressure holding, and exhaust operations and implementing automatic control of the pressure test operation.

Specifically, the controller controls the first valve 204 to be in an open state and controls the second valve 208 to be in a closed state at a first time, so that the air inlet pipeline 203 is conducted and the air outlet pipeline 207 is closed, and the water heater inner container 201 is inflated; at a second time, the controller controls the first valve 204 and the second valve 208 to be in a closed state, so that the water heater liner 201 is in a sealed state, and at this time, of course, the controller also controls the water heater liner 201 to sink into the water tank or manually sinks the water heater liner 201 into the water tank, so as to perform a pressure maintaining test; and maintaining the pressure for the third time, lifting the water heater liner 201 out of the water tank (in the same way, lifting can be automatically controlled by the controller or manually performed), and controlling the second valve 208 to be in an open state while lifting the water heater liner 201 by the controller so as to conduct the exhaust pipeline 207 and perform exhaust operation on the water heater liner 201.

With continued reference to fig. 2, in order to change the preset parameters in the controller, the intake and exhaust apparatus of the present embodiment includes an input module 213, a first relay 210 and a second relay 211, and the controller is a logic controller 212. A first output of the logic controller 212 is electrically connected to the first valve 204 through a first relay 210; a second output of the logic controller 212 is electrically connected to the second valve 208 via a second relay 211. The input module 213 is in signal connection with the logic controller 212, and is configured to input an operating parameter for the logic controller 212.

The control process of the first valve 204 and the second valve 208 by the logic controller 212 may specifically be:

the intake start time, intake time, dwell time, and exhaust time are first input to the logic controller 212 via the input module 213. When the logic controller 212 works, the logic controller outputs control signals through the first output end and the second output end, and controls the first relay 210 to be closed and the second relay 211 to be opened, so that the electromagnetic valve serving as the first valve 204 is controlled to be opened, the electromagnetic valve serving as the second valve 208 is controlled to be closed, and the air inlet operation is started; after the air intake time is over, the logic controller 212 outputs a control signal through the first output terminal to control the first relay 210 to be turned off, so as to control the electromagnetic valve as the first valve 204 to be closed.

The logic controller 212 then outputs a control signal to control at least a portion of the frame in which the water heater tank 201 is mounted to move downward to sink the water heater tank 201 into the tank.

Then, a dwell test was performed until the dwell time was over.

After the pressure maintaining time is over, the logic controller 212 outputs a control signal to control at least one part of the frame mounted with the water heater liner 201 to move upwards so as to lift the water heater liner 201 from the water tank, and at the same time, the logic controller 212 outputs a control signal through the second output end to control the second relay 211 to be closed, so as to control the electromagnetic valve as the second valve 208 to be opened so as to perform the exhaust operation.

By the control method, the logic controller 212 can automatically control the first valve 204 and the second valve 208 to be opened and closed according to working parameters including time, relay closing sequence and the like set by an operator, so that the automatic control of the water heater liners 201 of different models is realized.

The input module 213 of the present embodiment may be configured as a touch display screen. An operator changes pressure test parameters on the touch display screen, so that a control program of the logic controller 212 is suitable for air inlet, pressure maintaining and air exhaust operations of the water heater inner containers 201 of different models.

With continued reference to FIG. 3, the intake and exhaust apparatus of the present embodiment further includes an activation button 214. The start button 214 is in signal connection with the logic controller 212 and is used for providing a start signal for the logic controller 212 to start the logic controller 212, so that the first valve 204, the second valve 208, a rack for lifting the liner 201 of the water heater and other equipment can be automatically controlled to work according to pressure test parameters input by an operator in advance, one-key start is realized, and the whole pressure test work can be completed.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.