Flow control device of heat exchange unit

Abstract

The utility model relates to a flow control device of a heat exchange unit. The flow control device mainly comprises a primary water supply pipe, a bypass pipe, a return pipe and related valves and sensors. The device is characterized in that the bypass pipe is arranged to be in a winding corridor type and comprises an even number of bent positions, and the inner side of the pipe wall is in a small arc shape or a large arc shape so as to meet the specific hydrodynamic requirement. The bypass pipe is connected into the primary water supply pipe in parallel, and fluid distribution and convergence are achieved through the flow dividing area and the convergence area. The flow dividing area and the converging area are provided with pipe wall inner sides of different shapes so as to optimize fluid flowing. In addition, the device further comprises a backflow pipe which is arranged to be in an elbow shape and provided with a one-way valve. A temperature sensor, a flow sensor, a pressure sensor, a fault self-diagnosis module, a locking device and a position indicator are arranged among the valves. The flow of the heat exchange unit can be effectively controlled, the supply and demand adaptation degree is improved, a user can use heat safely and stably, and meanwhile energy is greatly saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of heating supply technology, especially relates to a flow control device of heat exchange unit. BACKGROUND

[0002] The heat exchange station is very important in the central heating system, which receives heat from the heat source and transmits the heat to the users by the secondary network circulating water pump after conversion by the heat exchanger. With the expansion of the heating scale, the traditional manual adjustment method cannot meet the demand, and the electric regulating valve is widely used because it can effectively regulate the system flow. However, if the electric regulating valve cannot work normally or has poor adjustment effect, it will cause hydraulic disorder and uneven heating. Therefore, the selection and application of the electric regulating valve are very important for the stable operation of the heating system. At present, due to load reduction, some heat exchange stations have the problem that the electric regulating valve does not match the current load, which affects the user's heating and causes waste of heat energy.

[0003] Chinese patent publication No. CN219454051 U discloses a heat exchange unit, which comprises a lithium bromide heat pump, a primary network water supply pipe, a primary network return water pipe, a secondary network water supply pipe and a secondary network return water pipe; the lithium bromide heat pump has a generator, a condenser, an evaporator and an absorber; the primary network water supply pipe is in communication with the inlet of the generator; the outlet of the generator is in communication with the inlet of the evaporator; the outlet of the evaporator is in communication with the primary network return water pipe; the secondary network water supply pipe is in communication with the inlet of the absorber; the outlet of the absorber is in communication with the inlet of the condenser; the outlet of the condenser is in communication with the secondary network return water pipe; the generator is in heat-conducting contact with the condenser; and the evaporator is in heat-conducting contact with the absorber.

[0004] Therefore, the heat exchange unit still has the problem that the electric regulating valve does not match the current load, which seriously affects the safe and stable heating of the user and causes waste of heat energy. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a flow control device of heat exchange unit to overcome the problem that the electric regulating valve does not match the current load in the prior art, which seriously affects the safe and stable heating of the user and causes waste of heat energy.

[0006] To achieve the above-mentioned purpose, the utility model provides a flow control device of heat exchange unit, characterized by comprising,

[0007] The primary water supply pipe comprises a water inlet, a water outlet, a primary electric regulating valve and a primary shut-off ball valve; the fluid flows into the water inlet and flows out of the water outlet;

[0008] The bypass pipe comprises a bypass electric regulating valve and a bypass shut-off ball valve, is arranged in a meandering manner, contains an even number of bends, one of which is arranged on the left side of the bypass electric regulating valve, and the inner side of the pipe wall of each bend is a small arc, and the inner diameter of the small arc is smaller than that of the large arc.

[0009] The bypass pipe is connected to the primary water supply pipe in parallel, one end is connected to the primary water supply pipe through a flow separation area, and the other end is connected to the primary water supply pipe through a flow combination area.

[0010] The flow separation area is connected to the primary water supply pipe at the beginning, and is connected to the bypass pipe at the end, the cross-sectional area of the beginning is different from that of the end, and the cross-sectional area of the beginning is larger than that of the end, the middle part between the beginning and the end is a transition, and the inner side of the pipe wall of the transition is a large arc, and the inner diameter of the large arc is larger than that of the end.

[0011] Further, one end of the flow combination area is connected to the bypass pipe, the other end is connected to the primary water supply pipe, and the middle part between the two ends is a bend, and the inner side of the pipe wall of the bend is a right angle.

[0012] Further, the primary electric regulating valve and the bypass electric regulating valve are arranged side by side, and the primary electric regulating valve is closer to the water inlet than the bypass electric regulating valve.

[0013] Further, it further comprises a return pipe, the return pipe is arranged in an elbow shape, the return pipe is connected to the bypass pipe through a first connection and a second connection, and is connected to the primary water supply pipe through a return area, a one-way valve is arranged on the return pipe, and the one-way valve only allows fluid to flow from the bypass pipe to the primary water supply pipe.

[0014] Further, a bend is arranged on the return pipe, the inner side of the pipe wall of the bend is a small arc, the inner side of the pipe wall of the first connection is a circular arc, the inner side of the pipe wall of the second connection is a U shape, and the inner diameter of the small arc is smaller than that of the large arc.

[0015] Further, it further comprises a pass-through stop valve, which is arranged between the bypass electric regulating valve and the bypass shut-off ball valve.

[0016] Further, temperature sensors, flow sensors, pressure sensors and fault self-diagnosis modules are arranged in the primary electric regulating valve and the bypass electric regulating valve.

[0017] Further, locking devices and position indicators are arranged in the primary shut-off ball valve and the bypass shut-off ball valve.

[0018] Further, the inner diameter of the large arc is 2 times the inner diameter of the small arc, and the inner diameter of the large arc is 2 times the inner diameter of the end.

[0019] Further, the primary water supply pipe, bypass pipe and return pipe are connected together by welding.

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] Firstly, the utility model discloses a unique design, including primary water supply pipe, bypass pipe, return pipe and related electric regulating valve and shut-off ball valve, effectively solve the problem of electric regulating valve and present situation load mismatch.

[0022] Secondly, the utility model discloses a return corridor type bypass pipe design, contains even number of bending, makes fluid in the flowing process can be more evenly dispersed and converge, thereby avoid the fluid impact and noise problem that can appear in traditional design.

[0023] Further, the different cross section design of the shunt area and the convergence area makes the fluid entering and leaving the bypass pipe realize more smooth transition, reduces the turbulent flow and vortex flow of fluid, thereby reduces the energy consumption of the system and improves the utilization efficiency of heat energy.

[0024] In addition, the utility model also sets up return pipe and check valve, effectively prevent the backflow and waste of heat energy.

[0025] In terms of operation, the utility model discloses a pass-through stop valve between electric regulating valve and shut-off ball valve, so that the operator can more conveniently carry out flow control and system maintenance.

[0026] Finally, the utility model discloses a locking device and position indicator in the shut-off ball valve, so that the operator can more intuitively understand the opening and closing state of the valve, and ensure the safe operation of the system.

[0027] In summary, the utility model discloses improve heat energy utilization efficiency, overcome the problem of the electric regulating valve and the present situation load mismatch in the prior art, ensure user safety and stability heat, reduce heat energy waste etc. With the prior art compares, the utility model discloses improve system stability, reduce energy consumption, improve the operation convenience and safety etc. It shows obvious technical advantage, provides a new technical solution for heat exchange unit flow control field, has wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the cross section structure schematic diagram of embodiment one in the flow control device of heat exchange unit of the utility model;

[0029] Figure 2 It is the cross section structure schematic diagram of embodiment two in the flow control device of heat exchange unit of the utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose and the advantage of the present application more clear and obvious, the following will be further described with examples, and it should be understood that the specific examples described here are only used to explain the present application, and not to limit the present application.

[0031] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0032] It should be noted that in the description of the present application, the terms "up", "down", "left", "right", "in", "out" and other terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the present application.

[0033] In addition, it should be noted that in the description of the present application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The utility model provides a kind of flow control device of heat exchange unit, comprising,

[0035] The primary water supply pipe 1 includes a water inlet 11, a water outlet 12, a primary electric regulating valve 13 and a primary shut-off ball valve 14, and fluid flows into the water inlet 11 and flows out of the water outlet 12.

[0036] The primary electric regulating valve 13 dynamically adjusts its opening degree by receiving signals from a control system, thereby accurately controlling the fluid flow rate through the primary water supply pipe 1, and indirectly balances the pressure in the pipe during the flow regulation, ensuring that the entire system operates under appropriate pressure conditions.

[0037] The primary shut-off ball valve 14 is used to quickly shut off fluid flow in specific situations.

[0038] The bypass pipe 2 includes a bypass electric regulating valve 21 and a bypass shut-off ball valve 22, and is arranged in a loop shape with an even number of bends 23, one of which is located on the left side of the bypass electric regulating valve 21, and the inner sides of the pipe walls of the bends 23 are small arcs with smaller inner diameters than the large arcs.

[0039] The bypass electric regulating valve 21 adjusts its opening degree according to actual working conditions by receiving signals from a control system, thereby controlling the fluid flow in the bypass pipe 2 to optimize the flow distribution and heat exchange effect of the entire system.

[0040] The bypass shut-off ball valve 22 is used to quickly shut off fluid flow in the bypass pipe 2 in specific situations.

[0041] The bypass pipe 2 is connected to the primary water supply pipe 1 in parallel, with one end connected to the primary water supply pipe 1 through a diverging area 24 and the other end connected to the primary water supply pipe 1 through a converging area 25.

[0042] The diverging area 24 has a different cross-sectional area at the beginning 241 connected to the primary water supply pipe 1 and the end 242 connected to the bypass pipe 2, with the beginning 241 being larger than the end 242, and the middle part of the beginning 241 and the end 242 is a transition 243, with the inner side of the pipe wall being a large arc with a larger inner diameter than the end 242.

[0043] Specifically, the converging area 25 has one end connected to the bypass pipe 2 and the other end connected to the primary water supply pipe 1, with the middle part being a bend 251, and the inner side of the pipe wall is a right angle.

[0044] Further, the primary electric regulating valve 13 and the bypass electric regulating valve 21 are arranged side by side, with the primary electric regulating valve 13 being closer to the water inlet 11 than the bypass electric regulating valve 21.

[0045] Specifically, it also includes a return pipe 3, which is elbow-shaped. The return pipe 3 is connected to the bypass pipe 2 through the first connection 31 and the second connection 32, and is connected to the primary water supply pipe 1 through the return zone 33. A one-way valve 34 is provided on the return pipe 3. The one-way valve 34 only allows fluid to flow from the bypass pipe 2 to the primary water supply pipe 1, preventing the fluid in the primary water supply pipe 1 from flowing back to the bypass pipe 2, maintaining the directionality and stability of the fluid flow in the entire system, and ensuring that the system performs heat exchange and flow regulation according to the normal working logic.

[0046] Specifically, the return pipe 3 is provided with a bend 35, the inner side of the bend 35 is a small arc, the inner side of the first connection 31 is a circular arc, and the inner side of the second connection 32 is U-shaped. The inner diameter of the small arc is smaller than the inner diameter of the large arc.

[0047] Specifically, it also includes a flow stop valve, which is installed between the bypass electric regulating valve 21 and the bypass shut-off ball valve 22. In certain operating procedures or equipment operating states, by opening or closing the flow stop valve, in conjunction with the bypass electric regulating valve 21 and the bypass shut-off ball valve 22, more precise and flexible control of the fluid flow in the bypass pipe 2 can be achieved.

[0048] Specifically, both the primary electric regulating valve 13 and the bypass electric regulating valve 21 are equipped with a temperature sensor, a flow sensor, a pressure sensor, and a fault self-diagnosis module. The temperature sensor monitors the fluid temperature at the location of the regulating valve in real time, the flow sensor accurately acquires the fluid flow rate data passing through the regulating valve, and the pressure sensor is responsible for detecting the fluid pressure. This data provides a basis for the precise adjustment of the regulating valve. The fault self-diagnosis module can promptly determine whether a fault has occurred, such as an electrical fault or a mechanical fault, based on the data collected by the sensors and the operating status information of the regulating valve itself, and generate corresponding fault codes to facilitate maintenance personnel to quickly locate and handle problems, ensuring the normal operation of the regulating valve.

[0049] Specifically, both the primary shut-off ball valve 14 and the bypass shut-off ball valve 22 are equipped with locking devices and position indicators. The locking devices secure the ball valve in a specific open or closed state, preventing accidental changes in its state due to misoperation, vibration, or other factors, thus improving the safety and stability of the system. The position indicators visually display whether the ball valve is currently open or closed, allowing operators to quickly understand its operating status and facilitating appropriate operation and management.

[0050] Specifically, the inner diameter of the large arc is twice the inner diameter of the small arc, and the inner diameter of the large arc is twice the inner diameter of the cross-section of terminal 242.

[0051] Specifically, the primary water supply pipe 1, the bypass pipe 2 and the return pipe 3 are connected together by welding. The welding connection can ensure the firmness and sealing of the connection between the pipes, avoid fluid leakage, and make the entire flow control device form a stable and reliable overall structure, meeting the requirements of long-term fluid pressure and temperature changes during the operation of the heat exchange unit.

[0052] The working principle is as follows:

[0053] During normal operation, fluid enters from the water inlet 11 of the primary water supply pipe 1, first flows through the primary electric regulating valve 13. The primary electric regulating valve 13 monitors the fluid state in real time through the internal temperature sensor, flow sensor and pressure sensor according to the system set parameters, and receives the signal of the control system, automatically adjusts the valve opening, and accurately controls the fluid flow and pressure into the subsequent equipment such as the heat exchanger.

[0054] The part of fluid adjusted by the primary electric regulating valve 13 continues to flow forward, and the other part of fluid is divided into the bypass pipe 2 at the dividing area 24. The large cross section of the starting end 241 gradually transitions to the smaller cross section of the terminal end 242 through the large arc, so that the fluid can enter the bypass pipe 2 more smoothly. The bypass electric regulating valve 21 in the bypass pipe 2 also controls its opening according to the system demand and sensor feedback signal, and adjusts the flow in the bypass pipe 2. Since the bypass pipe 2 is designed in a return shape with an even number of bends 23, and the bends 23 are small arcs, the fluid path is lengthened when flowing therein, which can exchange heat or other physical processes to some extent. The fluids in the bypass pipe 2 and the primary water supply pipe 1 eventually converge at the convergence area 25. Although the elbow 251 of the convergence area 25 is a right angle and will produce some resistance, it can still make the fluid re-converge and flow out from the water outlet 12 of the primary water supply pipe 1.

[0055] During the flow of fluid in the bypass pipe 2, part of the fluid may return to the primary water supply pipe 1 through the return pipe 3. The return pipe 3 is elbow-shaped, and the circular arc of the first connecting part 31, the U-shaped second connecting part 32 and the small arc of the turning part 35 all help the fluid to flow more smoothly in the return pipe 3. The one-way valve 34 ensures that the fluid can only flow from the bypass pipe 2 to the primary water supply pipe 1, avoiding the backflow of fluid in the primary water supply pipe 1, thereby ensuring the stability of the fluid flow direction in the system, and can assist in adjusting the flow balance between the bypass pipe 2 and the primary water supply pipe 1 according to the actual operation of the system.

[0056] When the equipment in the system needs maintenance or malfunctions, the primary shutoff ball valve 14 can quickly cut off the water flow of the primary water supply pipe 1, preventing fluid from continuing to flow into the equipment area that may have problems, ensuring the safety of maintenance personnel and the stability of the equipment. The bypass shutoff ball valve 22 is used to cut off the fluid in the bypass pipe 2, facilitating separate maintenance or repair of the bypass pipe 2 and its attached equipment. The locking device in the primary shutoff ball valve 14 and the bypass shutoff ball valve 22 can lock the valve in the closed state to prevent misoperation, and the position indicator clearly displays the open and closed state of the valve, facilitating confirmation by the staff.

[0057] The fault self-diagnosis module in the primary electric regulating valve 13 and the bypass electric regulating valve 21 continuously monitors the data collected by the temperature, flow, pressure, and other sensors. When these data exceed the normal range or the electrical, mechanical, and other parts of the valve itself have abnormalities, the fault self-diagnosis module will determine the fault type and generate a fault code. These information can help maintenance personnel quickly locate the problem and take appropriate maintenance measures to ensure that the system can resume normal operation as soon as possible after the fault is eliminated.

[0058] The primary electric regulating valve 13 and the bypass electric regulating valve 21 are arranged side by side, with the primary electric regulating valve 13 closer to the water inlet 11. They work together according to the overall control strategy of the system to jointly regulate the flow distribution in the primary water supply pipe 1 and the bypass pipe 2. For example, during the system startup phase, they gradually adjust the opening degree according to the preset startup program, allowing fluid to be reasonably distributed to each branch; when the load changes, they also cooperate with each other to meet different flow and pressure requirements.

[0059] The primary shutoff ball valve 14 and the bypass shutoff ball valve 22 cooperate with the electric regulating valve. In normal operation, the shutoff ball valve is in the open state to ensure smooth fluid passage; in the case of emergency shutdown or maintenance, the shutoff ball valve is closed, and the electric regulating valve stops the flow regulation function. At the same time, the passage stop valve arranged between the bypass electric regulating valve 21 and the bypass shutoff ball valve 22 can further control the fluid passage in the bypass pipe 2. In some special operation procedures or equipment operating states, by opening or closing the passage stop valve, more precise and flexible control of fluid flow in the bypass pipe 2 can be achieved.

[0060] Embodiment one, please refer to Figure 1 the figure, Figure 1 is a cross-sectional structure schematic diagram of embodiment one in the flow control device of the heat exchange unit.

[0061] In cold winter, the hot water source of the heating station supplies heating to the residential area. The hot water first flows into the water inlet 11 of the primary water supply pipe 1. The primary electric regulating valve 13, according to the initial setting, detects that the inlet water temperature is 70℃, and the flow sensor measures a flow of about 40m 3 / h, the pressure sensor acquires the corresponding pressure value. According to the preset overall initial heating demand of the community, the control system sets the opening degree of the primary electric regulating valve 13 to 25%. The hot water flows through the primary electric regulating valve 13 and the primary shutoff ball valve 14, at this time, the primary shutoff ball valve 14 is fully opened, and the heat is delivered to each building heat exchanger in the community, and part of the hot water starts to circulate in the community for heating, and at this time, the hot water temperature flowing out of the water outlet 12 of the primary water supply pipe 1 is slightly reduced, for example, to 68 DEG C, and the flow rate is about 38 m 3 / h. The bypass electric regulating valve 21 has an initial opening degree of 8%, and the bypass shutoff ball valve 22 is opened. The bypass pipe 2 has a meandering structure with four bending portions 23, and the inner diameter of the small arc of the bending portion 23 is assumed to be 25 mm. The hot water flows into the bypass pipe 2 through the shunt area 24. A small amount of hot water flows in the bypass pipe 2, exchanges heat with the pipe wall to a certain extent, and the hot water flow rate is slowed down and the temperature distribution is more uniform due to the long path and bending of the bypass pipe 2.

[0062] With the deepening of winter, the outdoor temperature decreases, and the indoor temperature of the community residents gradually decreases. The temperature sensor of each building and floor feeds back the data to the control system. After calculation, the control system sends a signal to the primary electric regulating valve 13, and the opening degree is increased to 40%, more hot water flows into the heat exchanger, and the heating intensity is improved. At the same time, the opening degree of the bypass electric regulating valve 21 is adjusted to 15%. More hot water enters the bypass pipe 2 through the shunt area 24, and the meandering flow in the bypass pipe 2 further optimizes the heat distribution, so that the heating effect of different positions in the community is more balanced. For example, the temperature of the edge building is low, and the temperature difference between the center building is reduced after the adjustment of the bypass pipe 2.

[0063] If the heat exchanger of a building fails, such as pipe leakage, the primary shutoff ball valve 14 is immediately closed, the locking device locks the valve closed state, the position indicator displays closed, and the hot water is prevented from flowing into the fault area. At the same time, the bypass shutoff ball valve 22 is closed, and the fluid flow related to the area in the bypass pipe 2 is stopped, so that the subsequent maintenance personnel can safely overhaul. In daily operation, if the flow sensor of the bypass electric regulating valve 21 fails, the fault self-diagnosis module analyzes the abnormal fluctuation of the flow data, combines the temperature, pressure sensor data and valve electrical and mechanical state, judges the fault type and generates an "E03-flow sensor fault" code. According to the code, the maintenance personnel can quickly locate and repair the fault, so that the bypass electric regulating valve 21 can restore normal work, and the heating system can continue to run stably.

[0064] Embodiment two, please refer to Figure 2 shown, Figure 2 is a cross-sectional structure schematic view of embodiment two in the flow control device of the heat exchange unit.

[0065] Based on the basis of example one, the flow control device of the heat exchange unit is further provided with a backflow pipe 3, the backflow pipe 3 is arranged as an elbow shape, the backflow pipe 3 is connected with the bypass pipe 2 through a first connecting part 31 and a second connecting part 32, and is connected with the primary water supply pipe 1 through a backflow area 33, a one-way valve 34 is arranged on the backflow pipe 3, the one-way valve 34 only allows fluid to flow from the bypass pipe 2 to the primary water supply pipe 1, and prevents the fluid in the primary water supply pipe 1 from flowing back to the bypass pipe 2, when the pressure of the bypass pipe 2 is too large when the fluid flows through the bypass pipe 2, part of the fluid flows through the bypass pipe 2, and the other part flows into the backflow pipe 3, the one-way valve 34 arranged on the backflow pipe 3 only allows fluid to flow from the bypass pipe 2 to the primary water supply pipe 1, the fluid flows back to the primary water supply pipe 1 through the backflow pipe 3, and after mixing with the fluid in the primary water supply pipe 1 again, enters the heat exchanger, so that the primary side flow entering the heat exchanger is accurately adjusted, the secondary side water temperature is stably kept in a suitable range, and comfortable indoor temperature is provided for residents in the community.

[0066] The elbow structure of the backflow pipe 3 and the circular arc shape of the first connecting part 31, the U shape of the second connecting part 32 and the small arc shape of the turning part 35 enable hot water to smoothly flow back and re-enter the primary water supply pipe 1, further balance the temperature and flow of the hot water and improve the stability and efficiency of the whole heating system.

[0067] In summary, the utility model has remarkable beneficial effects in improving heat energy utilization efficiency, overcoming the problem that the electric regulating valve does not match the current load in the prior art, ensuring user safety and stable heat utilization and reducing heat energy waste and the like. Compared with the prior art, the utility model has obvious technical advantages in improving system stability, reducing energy consumption, improving operation convenience and safety and the like, provides a new technical solution for the heat exchange unit flow control field and has wide application prospect.

[0068] Therefore, the technical scheme of the present application has been described in connection with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical schemes after the changes or replacements will all fall within the protection scope of the present application.

[0069] The above description is only the preferred embodiments of the present application and is not used to limit the present application; for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement and the like made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A flow control device for a heat exchanger unit, characterized by The utility model relates to a kind of water supply systems, including, Primary water supply pipe, including water inlet, water outlet, primary electric regulating valve and primary shut-off ball valve, fluid flows from water inlet, and flows from water outlet; Bypass pipe, including bypass electric regulating valve and bypass shut-off ball valve, the bypass pipe is arranged as a cloister, contains several bends, the number is even, wherein there is one in the bypass electric regulating valve left side, the inside of the pipe wall of the bend is small arc, and the inner diameter of small arc is less than the inner diameter of large arc; The bypass pipe is connected to the primary water supply pipe in parallel, one end is connected to the primary water supply pipe through a shunt area, and the other end is connected to the primary water supply pipe through a convergence area; The shunt area is connected to the primary water supply pipe at the beginning, and is connected to the bypass pipe at the end, the cross-sectional area of the beginning is different from that of the end, and the beginning is larger than the end, the middle part of the beginning and the end is a transition, and the inside of the pipe wall of the transition is large arc, and the inner diameter of large arc is larger than the inner diameter of the end cross section.

2. The flow control device of a heat exchanger unit according to claim 1, wherein The convergence area is connected to the bypass pipe at one end, and is connected to the primary water supply pipe at the other end, and the middle part of the two ends is a bend, and the inside of the pipe wall of the bend is a right angle.

3. The flow control device of a heat exchanger unit according to claim 1, wherein The primary electric regulating valve and the bypass electric regulating valve are arranged side by side, and the primary electric regulating valve is closer to the water inlet than the bypass electric regulating valve.

4. The flow control device of a heat exchanger unit according to claim 1, wherein It also includes a return pipe, the return pipe is arranged as an elbow, the return pipe is connected to the bypass pipe through a first connection and a second connection, and is connected to the primary water supply pipe through a return area, a one-way valve is arranged on the return pipe, and the one-way valve only allows fluid to flow from the bypass pipe to the primary water supply pipe.

5. The flow control device of a heat exchanger unit according to claim 4, wherein A bend is arranged on the return pipe, the inside of the pipe wall of the bend is small arc, the inside of the pipe wall of the first connection is circular arc, and the inside of the pipe wall of the second connection is U-shaped, and the inner diameter of small arc is less than the inner diameter of large arc.

6. The flow control device of a heat exchanger unit according to claim 1, wherein It also includes a pass-through stop valve arranged between the bypass electric regulating valve and the bypass shut-off ball valve.

7. The flow control device of a heat exchanger unit according to claim 1, wherein Temperature sensors, flow sensors, pressure sensors and fault self-diagnosis modules are arranged in the primary electric regulating valve and the bypass electric regulating valve.

8. The flow control device of a heat exchanger unit according to claim 1, wherein Locking devices and position indicators are arranged in the primary shut-off ball valve and the bypass shut-off ball valve.

9. The flow control device of a heat exchanger unit according to claim 1, wherein The inner diameter of large arc is twice the inner diameter of small arc, and the inner diameter of large arc is twice the inner diameter of the end cross section.

10. The flow control device of a heat exchanger unit according to claim 1, wherein The primary water supply pipe, the bypass pipe and the return pipe are connected together by welding.

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