Liquid flowing expansion tank device, control method and pressure regulating device

Abstract

The invention discloses an expansion tank device for liquid flowing, a control method and a pressure regulating device. The expansion tank device comprises an expansion tank, a first valve body, a second valve body, a third valve body, a first pipeline, a second pipeline and a bypass pipeline. Wherein the expansion tank comprises an expansion tank body and a rubber balloon, and the rubber balloon is arranged in the expansion tank body; the rubber balloon is provided with a first connector and a second connector, and one end of the first pipeline penetrates through the expansion tank to be connected with the first connector. One end of a bypass pipeline is connected between one end of the first pipeline and the first valve body, and a third valve body is arranged on the bypass pipeline; a first valve body is arranged on the first pipeline and located between the bypass pipeline and the other end of the first pipeline. One end of the second pipeline penetrates through the expansion tank body to be connected with the second connector, and the second pipeline extends to the upper middle position of the rubber balloon from the second connector; and a second valve body is arranged on the second pipeline. The device and the method can solve the problems that the medium in the expansion tank is difficult to flow and operate and maintain.

Description

Technical Field

[0001] The present invention relates to the field of expansion tank inspection and maintenance, and more specifically, to an expansion tank device for liquid flow, a control method and a pressure regulating device. Background Art

[0002] In the prior art, airbag expansion tanks have been widely used in central air conditioners, boilers, water heaters, constant pressure water supply, liquid cooling temperature control units and other equipment, and are important components for maintaining normal liquid pressure in the equipment. A common airbag expansion tank is equipped with an integral rubber balloon inside, and the rubber balloon is provided with a pipeline interface connected to the liquid in the main line of the equipment. During operation, the liquid enters the rubber balloon through the pipeline interface. The expansion tank body and the rubber balloon are not connected. The pressure caused by the gas between the expansion tank body and the rubber balloon on the liquid entering the rubber balloon is compared with the pressure of the liquid in the main line of the equipment. The pressure difference formed by the two is used to guide the liquid in and out of the rubber balloon, thereby adjusting the liquid pressure in the main line of the equipment to maintain it at a normal level. When the liquid pressure in the main line of the equipment changes slightly, the expansion or contraction of the rubber balloon of the expansion tank has a certain buffering effect on the change of the liquid pressure in the main line of the equipment, thereby ensuring the stability of the liquid pressure during the operation of the equipment.

[0003] Understandably, because the main pipeline liquid of the equipment itself has a certain pressure, when the main pipeline liquid of the equipment operates normally, a certain amount of solution should also be stored inside the rubber balloon to maintain balance. Based on the pressure regulation of the expansion tank, which is a slight pressure change regulation and the incompressibility of the liquid, during the pressure regulation process, only a small amount of liquid enters and squeezes out of the rubber balloon, and most of the solution in the rubber balloon remains in the rubber balloon without flowing, which leads to the growth of microorganisms in this part of the liquid, deterioration of liquid quality, precipitation, acidification and odor, etc., and even causes corrosion and damage to the expansion tank and affects the safe operation of the main pipeline liquid of the equipment.

[0004] Therefore, it is necessary to improve the structure and liquid flow method of the existing expansion tank based on the liquid flow problem of the expansion tank. Summary of the invention

[0005] The present invention aims to overcome at least one defect (shortcoming) of the above-mentioned prior art and provide an expansion tank device for liquid flow, a control method and a pressure regulating device, which are used to solve the problems of difficult flow of expansion tank medium and difficult operation and maintenance of expansion tank medium.

[0006] According to a first aspect of the present application, there is provided an expansion tank device for liquid flow, the expansion tank device comprising an expansion tank, a first valve body, a second valve body, a third valve body, a first pipeline, a second pipeline and a bypass pipeline;

[0007] The expansion tank comprises an expansion tank body, an expansion tank air nozzle and a rubber balloon, wherein the expansion tank air nozzle is arranged on the body wall of the expansion tank body, and the expansion air nozzle and the tank body are in a sealed state; the rubber balloon is arranged inside the expansion tank body, and a cavity is reserved between the rubber balloon and the expansion tank body;

[0008] The rubber balloon is provided with a first interface and a second interface, one end of the first pipeline passes through the expansion tank body and is connected to the first interface, and the other end of the first pipeline is used to access the medium low-pressure area where the equipment works; one end of the bypass pipeline is connected to the first valve body, and the other end of the bypass pipeline is used to access the medium low-pressure area outside the equipment, the third valve body is arranged on the bypass pipeline, and the third valve body is arranged outside the expansion tank body; the first valve body is arranged on the first pipeline, and the first valve body is arranged outside the expansion tank body and is located between the bypass pipeline and the other end of the first pipeline;

[0009] One end of the second pipe passes through the expansion tank body and is connected to the second interface, and the second pipe extends from the second interface to the upper middle position of the rubber balloon; the other end of the second pipe is used to access the medium high-pressure area where the equipment works, and the second valve body is arranged on the second pipe, and the second valve body is arranged outside the expansion tank body.

[0010] It can be understood that the expansion tank device is an improvement on the traditional expansion tank structure. By providing a short tube first pipe and interface for the medium to discharge from the rubber balloon and a long tube second pipe and interface for the medium to enter the rubber balloon, the traditional expansion tube structure that only uses one interface for the medium to enter and exit is avoided, thereby solving the problems of the growth of microorganisms in the solution in the rubber balloon, deterioration of medium quality, precipitation, and sourness and odor, effectively extending the service life of the expansion tank and providing technical guarantee for the continuous safe and reliable operation of the equipment; and using three valve bodies respectively arranged in areas with different medium pressure states, the difficulty of operation and maintenance is reduced, and the effect of efficient and simple operation and maintenance of the medium in the rubber balloon is achieved. It is understandable that the expansion tank body and the rubber balloon will form a cavity, and the cavity will be pre-filled with air of a certain standard pressure; the amount of medium in the rubber balloon can control the volume of the rubber balloon. If the medium pressure in the equipment is greater than the medium in the rubber balloon, the medium will be squeezed to replenish the medium in the rubber balloon, and the volume of the rubber balloon will increase, thereby squeezing the air in the cavity, thereby increasing the pressure of the gas. Under the interaction of the gas pressure and the medium pressure in the rubber balloon, and the medium pressure in the rubber balloon and the medium pressure in the equipment, they constantly tend towards equilibrium and reach a state of stable equipment pressure.

[0011] Optionally, the first valve body is a solenoid valve, an electric ball valve or a manual ball valve;

[0012] And / or, the second valve body is a solenoid valve, an electric ball valve or a manual ball valve;

[0013] And / or, the third valve body is a solenoid valve, an electric ball valve or a manual ball valve.

[0014] It is understandable that the first valve body, the second valve body and the third valve body can adopt one of the solenoid valves, electric ball valves or manual ball valves. The use of solenoid valves or electric ball valves can be electrically controlled, saving manpower and cumbersome manual control operations; the use of manual ball valves can save costs and make the entire solution more economical.

[0015] Optionally, the expansion tank device further includes a control unit, and the first valve body, the second valve body and the third valve body are also electrically connected to the control unit.

[0016] It is understandable that the control unit can electrically control the first valve body, the second valve body and the third valve body, and can run the program script to intelligently execute the following different operation plans, saving manpower and material resources and improving the efficiency of operation and maintenance.

[0017] According to a second aspect of the present application, a medium area pressure regulating device is provided, which is used to regulate the pressure of the medium area connected to the above-mentioned liquid flow expansion tank device, and the pressure regulating device includes a medium low-pressure area where the equipment is working, a medium low-pressure area outside the equipment, and a medium high-pressure area where the equipment is working, the medium low-pressure area where the equipment is working is connected to the other end of the first pipeline; the medium low-pressure area outside the equipment is connected to the other end of the bypass pipeline; the medium high-pressure area where the equipment is working is connected to the other end of the second pipeline.

[0018] It is understandable that for the different medium pressure state areas connected to the various pipelines of the expansion tank device, a device for regulating the pressure of the medium area is needed to help maintain the pressure state of the areas connected by different pipelines, realize the prerequisite of the following control method for the expansion tank device, and improve the efficiency of operation and maintenance.

[0019] According to a third aspect of the present application, a control method for an expansion tank device for liquid flow is provided, which is used to control the above-mentioned expansion tank device for liquid flow, and the control method comprises:

[0020] Acquire the operation mode of the expansion tank device, where the operation mode includes a working mode and an operation and maintenance mode;

[0021] If the operation mode of the expansion tank device is in the working mode, the first valve body is controlled to be in an open state, the second valve body and the third valve body are controlled to be in a closed state, and the first pipeline and the first interface are connected through the first valve body to regulate the pressure of the medium of the device;

[0022] An operation and maintenance plan is preset corresponding to the operation and maintenance mode. If the operation mode of the expansion tank device is in the operation and maintenance mode, the operation and maintenance plan is obtained, and the expansion tank device is operated and maintained according to the operation and maintenance plan.

[0023] It is understandable that the operating mode of the expansion tank device is divided into working mode and operation and maintenance mode. The working mode can maintain the stability of the equipment medium pressure, and the operation and maintenance mode can provide a variety of efficient operation and maintenance solutions for the expansion tank device, thereby realizing precise operation and maintenance without affecting the normal operation of the expansion tank.

[0024] Optionally, the operation and maintenance plan includes a first operation and maintenance plan, and the first operation and maintenance plan is:

[0025] Control the first valve body and the second valve body to be in a closed state, control the third valve body to be in an open state, and control the medium in the rubber balloon to be discharged to the medium low-pressure area outside the device through the first interface, the first pipeline, the bypass pipeline and the third valve body, so that the medium in the rubber balloon is emptied;

[0026] After the medium in the rubber balloon is emptied, the first valve body and the third valve body are controlled to be in a closed state, and the second valve body is controlled to be in an open state, and the medium high-pressure area of ​​the working medium of the device, the second pipeline and the second valve body are used to replenish the medium in the rubber balloon;

[0027] After the medium is replenished, the first valve body is controlled to be in an open state, and the second valve body and the third valve body are controlled to be in a closed state, so that the operation mode of the expansion tank device is switched from the operation and maintenance mode to the working mode.

[0028] It is understandable that the first operation and maintenance solution can achieve the operation and maintenance effect of draining the medium in the rubber balloon and then replenishing it. The third valve body is set on the bypass pipe, and the bypass pipe is connected to the low-pressure area of ​​the medium outside the equipment. The pressure difference between this area and the medium of the rubber balloon can completely discharge the medium of the rubber balloon, which is suitable for the need to replace all the medium of the rubber balloon; after the medium is completely discharged, the medium can be refilled into the rubber balloon through the second pipe to ensure that the rubber balloon continues to work normally.

[0029] Optionally, the operation and maintenance plan includes a second operation and maintenance plan, and the second operation and maintenance plan is:

[0030] Control the first valve body to be in a closed state, control the second valve body and the third valve body to be in an open state, control the medium in the rubber balloon to be discharged to the medium low-pressure area outside the device through the first interface, the first pipeline, the bypass pipeline and the third valve body, and at the same time use the medium high-pressure area of ​​the working device, the second pipeline and the second valve body to supplement the medium in the rubber balloon;

[0031] After the original medium in the rubber balloon is emptied and new medium is added, the first valve body is controlled to be in an open state, and the second valve body and the third valve body are controlled to be in a closed state, so that the operation mode of the expansion tank device is switched from the operation and maintenance mode to the working mode.

[0032] It is understandable that the second operation and maintenance solution can achieve the operation and maintenance effect of simultaneously draining and replenishing the medium in the rubber balloon, which is suitable for the need to completely replace the medium in the rubber balloon and can also improve the utilization rate of the operation and maintenance time.

[0033] Optionally, the operation and maintenance solution includes a third operation and maintenance solution, and the third operation and maintenance solution is:

[0034] The expansion tank device is operated by internal circulation: the first valve body and the second valve body are controlled to be in an open state, the third valve body is controlled to be in a closed state, the medium in the rubber balloon is supplemented by using the medium high-pressure area where the device is working, the second pipeline and the second valve body, and the medium in the rubber balloon is controlled to be discharged to the medium low-pressure area where the device is working through the first interface, the first pipeline and the first valve body;

[0035] After completing the internal circulation operation of the medium in the rubber balloon and the medium in the equipment, the first valve body is controlled to be in an open state, and the second valve body and the third valve body are controlled to be in a closed state, and the operation mode of the expansion tank device is converted from the operation and maintenance mode to the working mode.

[0036] It is understandable that the third operation and maintenance solution can achieve the operation and maintenance effect of draining and replenishing the medium in the rubber balloon at the same time inside the equipment, which is suitable for the need to promote the flow of all the media in the rubber balloon at a single time to achieve the effect of living water.

[0037] Optionally, the control unit further includes a timing module, and the timing module presets a timing time T; the operation and maintenance plan includes a fourth operation and maintenance plan, and the fourth operation and maintenance plan is:

[0038] The timing module is controlled to have an initial value of 0 for the timing time T and to start timing. When the timing time T is equal to a preset time threshold value T1, an internal circulation operation is performed: the operation mode of the expansion tank device is automatically switched from the working mode to the operation and maintenance mode, the first valve body and the second valve body are controlled to be in an open state, the third valve body is controlled to be in a closed state, the medium in the working medium area of ​​the device, the second pipeline and the second valve body are used to replenish the medium in the rubber balloon, and at the same time, the medium in the rubber balloon is controlled to be discharged to the working medium low-pressure area of ​​the device through the first interface, the first pipeline and the first valve body;

[0039] After completing the internal circulation operation of the medium in the rubber balloon and the medium in the device, the first valve body is controlled to be in an open state, and the second valve body and the third valve body are controlled to be in a closed state, so as to convert the operation mode of the expansion tank device from the operation and maintenance mode to the working mode;

[0040] After switching to the working mode, the timing time T is reset to 0 and a new round of timing is started. When the timing time T is equal to the time threshold T1 again, the inner loop operation is performed again.

[0041] It can be understood that the fourth operation and maintenance scheme achieves the operation and maintenance effect of draining and replenishing the medium in the rubber balloon at the same time inside the equipment, which is suitable for the needs of promoting the flow of all the media in the rubber balloon multiple times to achieve the effect of living water, and uses automatic circulation execution steps, which can save manpower and material resources, and regularly perform automated operation and maintenance on the medium in the rubber balloon to improve the efficiency of operation and maintenance.

[0042] Based on any one of the above aspects, an expansion tank device, a control method and a pressure regulating device for liquid flow provided in an embodiment of the present application can realize clever switching of the working mode and operation and maintenance mode of the expansion tank device through the first valve body, the second valve body, the third valve body and areas of different medium states connected to different channels, combined with different operation and maintenance schemes, and can provide different operation and maintenance schemes to realize operation and maintenance of the rubber balloon in different scenarios and with different requirements, and can solve the problems of difficult flow of the expansion tank medium and difficult operation and maintenance of the expansion tank medium, and provide operation and maintenance efficiency of the expansion tank medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1A structural diagram of a liquid flow expansion tank device provided in this embodiment.

[0045] Figure 2 A flow chart of a control method for a liquid flow expansion tank device provided in this embodiment.

[0046] Figure 3 This is a flow chart of a first operation and maintenance solution provided in this embodiment.

[0047] Figure 4 This is a flow chart of a second operation and maintenance solution provided in this embodiment.

[0048] Figure 5 This is a flow chart of a third operation and maintenance solution provided in this embodiment.

[0049] Figure 6 This is a flow chart of a fourth operation and maintenance solution provided in this embodiment.

[0050] Icons: 101-expansion tank body, 102-expansion tank air nozzle, 103-air nozzle sealing cap, 104-rubber balloon, 105-first pipeline, 106-second pipeline, 107-third valve body, 108-first valve body, 109-second valve body, 110-circulation pump, 111-equipment working low-pressure area, 112-equipment working high-pressure area, 113-control unit, 114-first interface, 115-second interface, 116-bypass pipeline. DETAILED DESCRIPTION

[0051] The drawings of this application are only used for illustrative purposes and should not be construed as limiting the present application. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the drawings may be omitted.

[0052] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0054] The airbag expansion tank is usually used to maintain the stability of the medium pressure in the equipment. The airbag expansion tank usually contains a rubber balloon inside. The rubber balloon is connected to the medium environment in the equipment through interfaces and pipes. The air pressure in the air between the expansion tank and the rubber balloon, the medium pressure in the rubber balloon and the medium pressure in the equipment are balanced to maintain the stability of the medium pressure in the equipment. However, the medium in the traditional expansion tank structure can only achieve the flow of a small part of the medium, and it is also very difficult to operate and maintain the medium in the rubber balloon. The operation and maintenance operations are single and insufficient to meet the daily operation and maintenance needs of the expansion tank medium. Therefore, this application improves the expansion tank structure and operation and maintenance method based on the above problems.

[0055] This embodiment provides a technical solution that can solve the above-mentioned problem. The specific implementation methods of this application are described in detail below in conjunction with the accompanying drawings.

[0056] For example, the structure diagram of a liquid flow expansion tank device provided in an embodiment of the present application is shown. Figure 1 As shown, the expansion tank device includes an expansion tank, a first valve body 108, a second valve body 109, a third valve body 107, a first pipeline 105, a second pipeline 106 and a bypass pipeline 116;

[0057] The expansion tank comprises an expansion tank body 101, an expansion tank air nozzle 102 and a rubber balloon 103, wherein the expansion tank air nozzle 102 is arranged on the body wall of the expansion tank body, and the expansion air nozzle 102 and the expansion tank body 101 are in a sealed state; the rubber balloon 103 is arranged inside the expansion tank body 101, and a cavity is reserved between the rubber balloon 103 and the expansion tank body 101;

[0058] The rubber balloon is provided with a first interface 114 and a second interface 115, one end of the first pipe 105 passes through the expansion tank 101 and is connected to the first interface 114, and the other end of the first pipe 105 is used to access the medium low-pressure area 111 where the equipment works; one end of the first pipe 105 is connected to the first valve body 108, and the other end of the bypass pipe 116 is used to access the medium low-pressure area outside the equipment, and the third valve body 107 is arranged on the bypass pipe 116, and the third valve body 107 is arranged outside the expansion tank 101; the first valve body 108 is arranged on the first pipe 105, and the first valve body 108 is arranged outside the expansion tank 101 and is located between the bypass pipe 116 and the other end of the first pipe 105;

[0059] One end of the second pipe 106 passes through the expansion tank 101 and is connected to the second interface 115, and the second pipe 106 extends from the second interface 115 to the upper middle position of the rubber balloon 104; the other end of the second pipe 106 is used to access the medium high-pressure area 112 where the equipment works, and the second valve body 109 is arranged on the second pipe 106, and the second valve body 109 is arranged outside the expansion tank 101.

[0060] Exemplarily, the specific working principle of the expansion tank is as follows:

[0061] A cavity is reserved between the expansion tank body 101 and the rubber balloon 104, and the cavity needs to be pre-filled with air at a standard pressure before the expansion tank is put into use. It is understandable that the expansion tank will be built into different equipment for use, such as central air conditioning, boilers, water heaters, constant pressure water supply, liquid cooling temperature control units and other equipment, and the medium environment circulated in different equipment is different, so that the pressure reached by the medium during normal operation of the equipment is different, so it is necessary to set different standard air pressures in the cavity according to the normal medium pressure required by different equipment, and then pre-fill the corresponding amount of air to reach the corresponding standard air pressure according to the corresponding standard air pressure and the corresponding expansion tank specifications, so that the expansion tank can more accurately maintain the stability of the equipment medium pressure. Preferably, the air in the cavity can be replaced by other media, and the principle of substitution meets the needs of the industry. This is not the focus of the research of this application and will not be repeated here. It can be understood that the gas pressure in the cavity is determined according to the specific equipment and usage scenario, and the gas pressure should be lower than the pressure of the medium at the connection between the expansion tank and the equipment inlet side, i.e., the first pipe 116 and the equipment, when the corresponding equipment is operating normally. That is, when the equipment is operating normally, a certain amount of medium is stored inside the rubber balloon 104.

[0062] When the medium pressure of the equipment in stable operation changes, such as the medium pressure of the equipment increases to be greater than the gas pressure in the cavity in the stable operation state, a part of the medium will enter the rubber balloon 104 under the action of the pressure difference, and the volume of the rubber balloon 104 will increase, further compressing the air in the cavity. The compressed air increases the air pressure. When the pressure increases to be equal to the pressure of the medium at the inlet side of the equipment, that is, the connection between the first pipeline 116 and the equipment, the medium stops entering the rubber balloon 104, and the equipment reaches a new stable operation state. On the contrary, when the pressure of the medium at the inlet side of the equipment, that is, the first valve body 108, decreases, That is, if the pressure of the medium at the equipment inlet side, i.e., the first pipe 116, and the connection between the equipment is lower than the gas pressure in the cavity, the medium in the rubber balloon 104 will be squeezed out by the air and added to the medium in the equipment, so that the pressure of the medium at the system inlet side, i.e., the connection between the first pipe 116 and the equipment, increases. Under the interaction of the gas pressure in the cavity and the medium pressure in the rubber balloon 104, the medium pressure in the rubber balloon 104, and the medium pressure in the equipment, the pressure of the medium at the equipment inlet side, i.e., the connection between the first pipe 116 and the equipment, and the air pressure in the cavity are equal, the equipment medium pressure reaches a new stable state. Therefore, when the pressure of the equipment medium changes slightly, the expansion and contraction of the rubber balloon 104 has a certain buffering effect on the change of the equipment medium pressure, thereby ensuring the stability of the equipment operation pressure.

[0063] Preferably, the expansion tank gas nozzle 102 further comprises a gas nozzle sealing cap 103 installed on the top of the expansion tank gas nozzle 102 , and the expansion tank gas nozzle 102 and the gas nozzle sealing cap 103 are connected by a sealing ring end face sealing solution.

[0064] It is understandable that the expansion tank nozzle 102 is used to fill the cavity with air or other media. Common expansion tank nozzles 102 are similar to automobile tire inflator nozzles, which mainly use one seal. After long-term operation, there will be a certain amount of gas leakage, and the accuracy of the air or other medium pressure in the cavity directly affects the effectiveness of the expansion tank's buffering function. Therefore, the air tightness of the expansion tank is very important for the precise operation of the expansion tank.

[0065] In this embodiment, a sealing ring end face sealing solution is used to seal the original expansion tank gas nozzle 102 and the top connection of the expansion tank, and a new gas nozzle sealing cap 103 is also added, which is also sealed by a sealing ring end face sealing solution, so that a double seal is formed, which can effectively eliminate the micro-leakage problem of one seal and reduce the maintenance frequency of operation and maintenance personnel.

[0066] It is understandable that the sealing ring end face sealing solution is a sealing technology widely used in mechanical equipment. It aims to prevent the leakage of liquid or gas through the close fit between the sealing ring and the contact surface. It includes O-ring sealing, V-ring sealing, U-ring sealing and other sealing solutions in detail. The corresponding sealing solutions can be adopted according to different expansion tank specifications and application scenarios.

[0067] In this embodiment, the standard calibration of the gas pressure in the cavity and the maintenance of the airtightness of the expansion tank play an important role in the operation of the entire expansion tank. Most traditional expansion tank nozzles have only one sealing operation, that is, the connection between the expansion tank nozzle and the top of the expansion tank is sealed by a traditional sealing method. Such a sealing scheme will have a certain amount of gas leakage after long-term operation. The above situation requires operation and maintenance personnel to conduct regular inspections and confirm the airtightness of the expansion tank, which will increase the workload of the operation and maintenance personnel, and also lead to a large number of expansion tanks in use not being regularly inspected and maintained. They are not replaced and maintained until the failure of the expansion tank affects the normal operation of the equipment, which greatly affects the working effect of the expansion tank. In the present application, a nozzle sealing cap is also provided on the top of the expansion tank nozzle, and a sealing ring end face sealing scheme is used for connection, which can form a double seal in the expansion tank nozzle, which can effectively eliminate the problem of micro-leakage in one seal and reduce the maintenance frequency of operation and maintenance personnel.

[0068] Specifically, the first valve body 108 is a solenoid valve, an electric ball valve or a manual ball valve;

[0069] And / or, the second valve body 109 is a solenoid valve, an electric ball valve or a manual ball valve;

[0070] And / or, the third valve body 107 is a solenoid valve, an electric ball valve or a manual ball valve.

[0071] In this embodiment, the first valve body 108, the second valve body 109 and the third valve body 107 can all be one of a solenoid valve, an electric ball valve or a manual ball valve. The use of a solenoid valve or an electric ball valve can cooperate with the control unit and be electrically connected thereto, so that the operation and maintenance personnel can directly remotely control the opening and closing of the first valve body 108, the second valve body 109 and the third valve body 107 in the control unit, thereby realizing intelligent control of the expansion tank device; the use of a manual ball valve requires the operation and maintenance personnel to manually control the opening and closing of each valve body, which can save electricity and control costs.

[0072] Specifically, the expansion tank device further includes a control unit 113 , and the first valve body 108 , the second valve body 109 and the third valve body 107 are also electrically connected to the control unit 113 .

[0073] In this embodiment, if it is necessary to cooperate with the control unit 113 to control different valve bodies, the three valve bodies are required to use solenoid valves or electric ball valves, and are electrically connected to the control unit 113 through the three valve bodies, and the switch instructions issued by the control unit 113 are introduced separately to realize remote control of the three valve bodies; and the control unit 113 can record and run scripts of different operation and maintenance solutions, so that the three valve bodies can implement different operation and maintenance solutions according to the scripts, which also greatly enhances the intelligence of the device.

[0074] In this embodiment, a circulating pump 110 is also included in the medium circulation pipeline of the device, and the circulating pump can provide power for the medium circulation of the device to maintain the flow of the medium in the device. Figure 1 As shown, 111 is the medium low pressure area of ​​the equipment working, which is the medium area with low power in the equipment working medium pipeline, and 112 is the medium high pressure area of ​​the equipment working, which is the medium area with high power in the equipment working medium pipeline; the medium low pressure area 111 of the equipment working is connected to the inlet of the circulation pump 110, and the medium high pressure area 112 of the equipment working is connected to the outlet of the circulation pump. The circulation pump 110 can also be electrically connected to the control unit 113 to realize intelligent control of the circulation pump 110.

[0075] On the other hand, the present application also provides a medium area pressure regulating device for regulating the pressure of the medium area connected to the expansion tank device where liquid flows, the pressure regulating device includes a medium low-pressure area 111 where the equipment is working, a medium low-pressure area outside the equipment, and a medium high-pressure area 112 where the equipment is working, the medium low-pressure area 111 where the equipment is working is connected to the other end of the first pipeline 105; the medium low-pressure area outside the equipment is connected to the other end of the bypass pipeline 116; the medium high-pressure area 112 where the equipment is working is connected to the other end of the second pipeline 109.

[0076] In this embodiment, the flow of the medium is promoted by the pressure difference between the medium at different positions, so the pressure difference is created to control the flow of the medium in the device and the equipment. The pressure regulating device can create a low-pressure medium environment in the medium low-pressure area 111 of the equipment, so that the medium can flow out of the equipment pipeline in the rubber balloon 104; the pressure regulating device can create a low-pressure medium environment in the medium low-pressure area outside the equipment, so that the medium can flow out of the equipment outside in the rubber balloon 104; the pressure regulating device can create a high-pressure medium environment in the medium high-pressure area 112 of the equipment, so that the medium can flow into the rubber balloon 104, thereby ensuring the smooth progress of the control method.

[0077] On the other hand, the present application also provides a control method for an expansion tank device of a liquid flow, such as Figure 2 As shown, the method can be subdivided into the following steps:

[0078] S100, obtaining an operation mode of the expansion tank device, wherein the operation mode includes a working mode and an operation and maintenance mode;

[0079] S200, if the operation mode of the expansion tank device is in the working mode, the first valve body 108 is controlled to be in an open state, the second valve body 109 and the third valve body 107 are controlled to be in a closed state, and the first pipeline 105 and the first interface 114 are connected through the first valve body 108 to regulate the pressure of the medium of the device;

[0080] S300, presetting an operation and maintenance plan corresponding to the operation and maintenance mode, if the operation mode of the expansion tank device is in the operation and maintenance mode, obtaining the operation and maintenance plan, and performing operation and maintenance on the expansion tank device according to the operation and maintenance plan.

[0081] In this embodiment, the working mode of the expansion tank device is to stabilize the operating pressure of the medium in the equipment; the operation and maintenance mode can operate and maintain the medium in the rubber balloon 104, including replacing the internal medium, replenishing the internal medium, circulating the internal medium, etc., and provide different operation and maintenance solutions to adapt to different operation and maintenance scenarios.

[0082] Specifically, Figure 3 As shown, the implementation of the first operation and maintenance plan can be divided into the following steps:

[0083] S311, controlling the first valve body 108 and the second valve body 109 to be in a closed state, controlling the third valve body 107 to be in an open state, and controlling the medium in the rubber balloon 104 to be discharged to the medium low-pressure area outside the device through the first interface 114, the first pipeline 105, the bypass pipeline 116 and the third valve body 107, so that the medium in the rubber balloon 104 is emptied;

[0084] S312, after the medium in the rubber balloon 104 is emptied, the first valve body 108 and the third valve body 107 are controlled to be in a closed state, and the second valve body 109 is controlled to be in an open state, and the medium is replenished to the rubber balloon 104 by using the working medium high pressure area 112 of the equipment, the second pipeline 106 and the second valve body 109;

[0085] S313, after the medium is replenished, the first valve body 108 is controlled to be in an open state, and the second valve body 109 and the third valve body 107 are controlled to be in a closed state, and the operation mode of the expansion tank device is switched from the operation and maintenance mode to the working mode.

[0086] In this embodiment, when the first operation and maintenance solution is implemented, the first valve body 108 and the second valve body 109 are closed, and the third valve body 107 is opened, so that the medium in the rubber balloon 104 can be discharged first, because the third valve body 107 is connected to the low-pressure area of ​​the medium outside the equipment, and can form a pressure difference with the medium pressure in the rubber balloon 104. Under the action of the pressure difference, the medium flows out through the third valve body 107 in the first pipeline 105; preferably, it can be determined by pre-setting the time threshold T3 that the medium of the rubber balloon 104 has finished flowing out, and the time threshold T3 is extended to ensure that the medium of the rubber balloon 104 has completely flowed out;

[0087] After the medium in the rubber balloon 104 is emptied, the first valve body 108 and the third valve body 107 are closed, and the second valve body 109 is opened, so that the medium can be pre-input into the rubber balloon 104, because the second valve body 109 is connected to the medium high-pressure area 112 inside the equipment, which can form a pressure difference with the rubber balloon 104. Under the action of the pressure difference, the medium flows into the rubber balloon 104 through the second valve body 109 in the second pipe 106; preferably, it can be determined by pre-setting the time threshold T4 that the medium filling of the rubber balloon 104 is complete, and the extension time threshold T4 ensures that when the expansion tank is put into use again, the rubber balloon 104 has the corresponding required medium capacity, and will not cause safety problems caused by a sudden change in the operating pressure at the inlet where the first pipe 105 and the equipment are connected; the specific values ​​of T3 and T4 are set by the device product developer of the present application, and are input into the control unit 113 to open the setting modification authority or time through a simple timer.

[0088] Specifically, Figure 4 As shown, the implementation of the second operation and maintenance plan can be divided into the following steps:

[0089] S321, control the first valve body 108 to be in a closed state, control the second valve body 109 and the third valve body 107 to be in an open state, control the medium in the rubber balloon 104 to be discharged to the medium low-pressure area outside the device through the first interface 114, the first pipeline 105, the bypass pipeline 116 and the third valve body 107, and at the same time use the medium high-pressure area 112 of the working device, the second pipeline 106 and the second valve body 109 to supplement the medium in the rubber balloon 104;

[0090] S322. After the medium is replenished, the first valve body 108 is controlled to be in an open state, and the second valve body 109 and the third valve body 107 are controlled to be in a closed state, so as to switch the operation mode of the expansion tank device from the operation and maintenance mode to the working mode.

[0091] In this embodiment, when implementing the second operation and maintenance solution, the first valve body 108 is closed, and the second valve body 109 and the third valve body 107 are opened, so that the medium in the rubber balloon 104 can be discharged and filled at the same time; because the third valve body 107 is connected to the low-pressure area 111 of the medium outside the equipment, it can form a pressure difference with the medium pressure in the rubber balloon 104, and under the action of the pressure difference, the medium flows out through the third valve body 107 in the first pipeline 105; because the second valve body 109 is connected to the high-pressure area 112 of the medium inside the equipment, it can form a pressure difference with the rubber balloon 104, and under the action of the pressure difference, the medium flows out in the second pipeline 106 The medium flows into the rubber balloon 104 through the second valve body 109; preferably, the pre-set time threshold T5 can be used to determine that the medium in the rubber balloon 104 has completely flowed out and been filled, and the extended time threshold T5 ensures that the medium in the rubber balloon 104 has completely flowed out, and at the same time ensures that when the expansion tank is put into operation again, the rubber balloon 104 has the required medium capacity, and does not cause safety problems caused by a sudden change in the operating pressure at the inlet where the first pipeline 105 and the equipment are connected; the specific value of the time threshold T5 is set by the device product developer of the present application, and is input into the control unit 113 and is open to set modification permissions or timed by a simple timer.

[0092] Specifically, Figure 5 As shown, the implementation of the third operation and maintenance solution can be divided into the following steps:

[0093] S331, perform internal circulation operation on the expansion tank device: control the first valve body 108 and the second valve body 109 to be in an open state, control the third valve body 107 to be in a closed state, use the high-pressure area 112 of the working medium of the equipment, the second pipeline 106 and the second valve body 109 to replenish the medium in the rubber balloon 104, and control the medium in the rubber balloon 104 to be discharged to the low-pressure area of ​​the working medium of the equipment through the first interface 114, the first pipeline 105 and the first valve body 108;

[0094] S332. After completing the internal circulation operation of the medium in the rubber balloon 104 and the medium in the equipment, control the first valve body 108 to be in an open state, control the second valve body 109 and the third valve body 107 to be in a closed state, and convert the operation mode of the expansion tank device from the operation and maintenance mode to the working mode.

[0095] In this embodiment, when implementing the third operation and maintenance scheme, the third valve body 107 is closed, and the first valve body 108 and the second valve body 109 are opened, so that the medium in the rubber balloon 104 can be circulated; because the second valve body 109 is connected to the high-pressure area 112 of the medium inside the equipment, it can form a pressure difference with the rubber balloon 104. Under the action of the pressure difference, the medium flows into the rubber balloon through the second valve body 109 in the second pipe 106; after the medium flows into the rubber balloon 104, the air in the cavity interacts with the rubber balloon 104, so that the medium pressure in the rubber balloon 104 increases, forcing the medium previously in the rubber balloon 104 to flow out through the first valve body 107 and the first pipe 105 to the low-pressure area 111 of the working medium of the equipment, thereby forming a first-in-first-out of the medium of the rubber balloon 104, and forming an internal circulation of the medium of the rubber balloon 104 and the medium in the equipment.

[0096] Specifically, the control unit 113 further includes a timing module, and the timing module presets a timing time T; Figure 6 As shown, the implementation of the fourth operation and maintenance plan can be divided into the following steps:

[0097] S341, control the timing module to have an initial value of 0 and start timing, and when the timing T is equal to a preset time threshold T1, implement an internal circulation operation: automatically switch the operation mode of the expansion tank device from the working mode to the operation and maintenance mode, control the first valve body 108 and the second valve body 109 to be in an open state, control the third valve body 107 to be in a closed state, use the medium high pressure area 112 of the working medium of the device, the second pipeline 106 and the second valve body 109 to replenish the medium in the rubber balloon 104, and control the medium in the rubber balloon 104 to be discharged to the medium low pressure area 111 of the working medium of the device through the first interface 114, the first pipeline 105 and the first valve body 108;

[0098] S342, after completing the internal circulation operation of the medium in the rubber balloon 104 and the medium in the device, control the first valve body 108 to be in an open state, control the second valve body 109 and the third valve body 107 to be in a closed state, and convert the operation mode of the expansion tank device from the operation and maintenance mode to the working mode;

[0099] S343, after switching to the working mode, the timing time T is reset to 0 and a new round of timing is started, and when the timing time T is equal to the time threshold T1 again, the inner loop operation is performed again.

[0100] In this embodiment, when implementing the fourth operation and maintenance solution, it is necessary to first count the timing time T. When T is equal to the preset time threshold T1, the internal circulation operation is started: the third valve body 107 is closed, and the first valve body 108 and the second valve body 109 are opened, so that the medium in the rubber balloon 104 can be circulated; because the second valve body 109 is connected to the medium high-pressure area 112 inside the equipment, it can form a pressure difference with the rubber balloon 104. Under the action of the pressure difference, the medium flows into the rubber balloon through the second valve body 109 in the second pipe 106; after the medium flows into the rubber balloon 104, the air in the cavity interacts with the rubber balloon 104. The rubber balloon 104 is used to increase the medium pressure in the rubber balloon 104, forcing the medium previously in the rubber balloon 104 to flow out to the low-pressure area 111 of the equipment working medium through the first valve body 107 and the first pipe 105, thereby forming a first-in-first-out of the rubber balloon 104 medium, and forming an internal circulation of the rubber balloon 104 medium and the medium in the equipment; the preset time threshold T1 can set the time interval between two operations and maintenance, and can realize automatic operation and maintenance of the expansion tank device, reducing the waste of manpower and material resources; the specific value of T1 is set by the device product developer of this application, and is input into the control unit 113 and is open to set the modification authority or time through a simple timer.

[0101] In this embodiment, the first operation and maintenance plan and the second operation and maintenance plan can discharge all the media in the rubber balloon 104 to the outside of the system and then replenish them, which can achieve the effect of replacing all the media; the third operation and maintenance plan and the fourth operation and maintenance plan can only use the medium of the equipment to circulate the medium of the rubber balloon 104, which plays the role of living water and prevents bacterial growth.

[0102] Specifically, the method further includes: determining that the inner loop operation is completed by a preset time threshold T2.

[0103] In this embodiment, a time threshold T2 can be preset to determine that the internal circulation operation is completed. The extended time threshold T2 ensures that the originally non-flowing medium inside the rubber balloon 104 dynamically flows back to the device for live water purification, and the solution retained in the rubber balloon 104 is the flowing medium in the device, and at the same time will not cause safety problems caused by sudden changes in the operating pressure of the inlet connecting the first pipeline 105 and the device; the specific value of T2 is set by the device product developer of this application, and is input into the control unit 113 and is open to set the modification authority or time through a simple timer.

[0104] Preferably, the second valve body 109 can be connected to other high-pressure positions of the medium in the device to ensure that there is a pressure difference between the first pipe 105 and the second pipe 106 in the rubber balloon 104, and to support the flow of the medium in the rubber balloon 104. In addition, the high-pressure end of the second valve body 109 can be directly connected to the outlet end of the automatic medium replenishment system to meet the requirement of directly replenishing the external clean medium and live water into the rubber balloon 104; this solution requires adding a valve body at the connection between the automatic medium replenishment system and the inlet pipeline of the circulation pump 110, so that when the live water is replenished, the external clean medium will not be replenished into the device synchronously.

[0105] The patent of the present invention provides an expansion tank and a control method for liquid flow. The air nozzle of the expansion tank has a double sealing function, which can effectively eliminate the micro-leakage problem of the pre-filled gas seal; the expansion tank supports and controls the flow of live water in the medium in the rubber balloon, which meets the flowability of the solution in the rubber balloon from a mechanism point of view, thereby eliminating the growth of microorganisms in the solution in the balloon, deterioration of water quality, precipitation, acidification and odor, etc., effectively extending the service life of the expansion tank and providing technical guarantee for the safe and reliable operation of the equipment.

[0106] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation methods of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. An expansion tank device for liquid flow, characterized in that: The expansion tank device comprises an expansion tank, a first valve body, a second valve body, a third valve body, a first pipeline, a second pipeline and a bypass pipeline; The expansion tank comprises an expansion tank body, an expansion tank air nozzle and a rubber balloon, wherein the expansion tank air nozzle is arranged on the body wall of the expansion tank body, and the expansion air nozzle and the expansion tank body are in a sealed state; the rubber balloon is arranged inside the expansion tank body, and a cavity is reserved between the rubber balloon and the expansion tank body; The rubber balloon is provided with a first interface and a second interface, one end of the first pipeline passes through the expansion tank body and is connected to the first interface, and the other end of the first pipeline is used to access the medium low-pressure area where the equipment works; one end of the bypass pipeline is connected to the first valve body, and the other end of the bypass pipeline is used to access the medium low-pressure area outside the equipment, the third valve body is arranged on the bypass pipeline, and the third valve body is arranged outside the expansion tank body; the first valve body is arranged on the first pipeline, and the first valve body is arranged outside the expansion tank body and is located between the bypass pipeline and the other end of the first pipeline; One end of the second pipe passes through the expansion tank body and is connected to the second interface, and the second pipe extends from the second interface to the upper middle position of the rubber balloon; the other end of the second pipe is used to access the medium high-pressure area where the equipment works, and the second valve body is arranged on the second pipe, and the second valve body is arranged outside the expansion tank body.

2. A liquid flow expansion tank device according to claim 1, characterized in that: The first valve body is a solenoid valve, an electric ball valve or a manual ball valve; And / or, the second valve body is a solenoid valve, an electric ball valve or a manual ball valve; And / or, the third valve body is a solenoid valve, an electric ball valve or a manual ball valve.

3. An expansion tank device for liquid flow according to any one of claims 1 to 2, characterized in that: The expansion tank device further comprises a control unit, and the first valve body, the second valve body and the third valve body are also electrically connected to the control unit.

4. A pressure regulating device for a medium area, characterized in that: Used to regulate the pressure of the medium area connected to the expansion tank device for liquid flow as described in any one of claims 1-3, the pressure regulating device includes a medium low-pressure area where the equipment is working, a medium low-pressure area outside the equipment, and a medium high-pressure area where the equipment is working, the medium low-pressure area where the equipment is working is connected to the other end of the first pipeline; the medium low-pressure area outside the equipment is connected to the other end of the bypass pipeline; the medium high-pressure area where the equipment is working is connected to the other end of the second pipeline.

5. A method for controlling a liquid flow expansion tank device, characterized in that: An expansion tank device for controlling the flow of a liquid according to any one of claims 1 to 3, the control method comprising: Acquire the operation mode of the expansion tank device, wherein the operation mode includes a working mode and an operation and maintenance mode; If the operation mode of the expansion tank device is in the working mode, the first valve body is controlled to be in an open state, the second valve body and the third valve body are controlled to be in a closed state, and the first pipeline and the first interface are connected through the first valve body to regulate the pressure of the medium of the device; An operation and maintenance plan is preset corresponding to the operation and maintenance mode. If the operation mode of the expansion tank device is in the operation and maintenance mode, the operation and maintenance plan is obtained, and the expansion tank device is operated and maintained according to the operation and maintenance plan.

6. The control method of a liquid flow expansion tank device according to claim 5, characterized in that: The operation and maintenance plan includes a first operation and maintenance plan, and the first operation and maintenance plan is: Control the first valve body and the second valve body to be in a closed state, control the third valve body to be in an open state, and control the medium in the rubber balloon to be discharged to the medium low-pressure area outside the device through the first interface, the first pipeline, the bypass pipeline and the third valve body, so that the medium in the rubber balloon is emptied; After the medium in the rubber balloon is emptied, the first valve body and the third valve body are controlled to be in a closed state, and the second valve body is controlled to be in an open state, and the medium high-pressure area of ​​the working medium of the device, the second pipeline and the second valve body are used to replenish the medium in the rubber balloon; After the medium is replenished, the first valve body is controlled to be in an open state, and the second valve body and the third valve body are controlled to be in a closed state, so that the operation mode of the expansion tank device is switched from the operation and maintenance mode to the working mode.

7. The control method of a liquid flow expansion tank device according to claim 5, characterized in that: The operation and maintenance plan includes a second operation and maintenance plan, and the second operation and maintenance plan is: Control the first valve body to be in a closed state, control the second valve body and the third valve body to be in an open state, control the medium in the rubber balloon to be discharged to the medium low-pressure area outside the device through the first interface, the first pipeline, the bypass pipeline and the third valve body, and at the same time use the medium high-pressure area of ​​the working device, the second pipeline and the second valve body to supplement the medium in the rubber balloon; After the original medium in the rubber balloon is emptied and new medium is added, the first valve body is controlled to be in an open state, and the second valve body and the third valve body are controlled to be in a closed state, so that the operation mode of the expansion tank device is switched from the operation and maintenance mode to the working mode.

8. The control method of a liquid flow expansion tank device according to claim 5, characterized in that: The operation and maintenance solution includes a third operation and maintenance solution, and the third operation and maintenance solution is: The expansion tank device is operated by internal circulation: the first valve body and the second valve body are controlled to be in an open state, the third valve body is controlled to be in a closed state, the medium in the rubber balloon is supplemented by using the medium high-pressure area where the device is working, the second pipeline and the second valve body, and the medium in the rubber balloon is controlled to be discharged to the medium low-pressure area where the device is working through the first interface, the first pipeline and the first valve body; After completing the internal circulation operation of the medium in the rubber balloon and the medium in the equipment, the first valve body is controlled to be in an open state, and the second valve body and the third valve body are controlled to be in a closed state, and the operation mode of the expansion tank device is converted from the operation and maintenance mode to the working mode.

9. The control method of a liquid flow expansion tank device according to claim 5, characterized in that: The operation and maintenance solution includes a fourth operation and maintenance solution, and the fourth operation and maintenance solution is: The timing module is controlled to have an initial value of 0 for the timing time T and to start timing. When the timing time T is equal to a preset time threshold value T1, an internal circulation operation is performed: the operation mode of the expansion tank device is automatically switched from the working mode to the operation and maintenance mode, the first valve body and the second valve body are controlled to be in an open state, the third valve body is controlled to be in a closed state, the medium in the working medium area of ​​the device, the second pipeline and the second valve body are used to replenish the medium in the rubber balloon, and at the same time, the medium in the rubber balloon is controlled to be discharged to the working medium low-pressure area of ​​the device through the first interface, the first pipeline and the first valve body; After completing the internal circulation operation of the medium in the rubber balloon and the medium in the device, the first valve body is controlled to be in an open state, and the second valve body and the third valve body are controlled to be in a closed state, so as to convert the operation mode of the expansion tank device from the operation and maintenance mode to the working mode; After switching to the working mode, the timing time T is reset to 0 and a new round of timing is started. When the timing time T is equal to the time threshold T1 again, the inner loop operation is performed again.

10. A method for controlling a liquid flow expansion tank device according to any one of claims 8 to 9, characterized in that: The method further includes: determining that the inner loop operation is completed by using a preset time threshold T2.

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