Liquid inlet pipe structure for plate heat exchanger

Abstract

The liquid inlet pipe structure comprises a first bypass pipe and a second bypass pipe, one end of the first bypass pipe and one end of the second bypass pipe are connected through a first connecting pipe, the other end of the first bypass pipe and the other end of the second bypass pipe are connected through a second connecting pipe, and one side of the first connecting pipe is connected with a liquid inlet pipe. One side of the second connecting pipe is connected with a liquid outlet pipe; the first bypass pipe is sequentially connected with a first valve, a first filter and a second valve, and the second bypass pipe is sequentially connected with a third valve, a second filter and a fourth valve. According to the utility model, the first bypass pipe and the second bypass pipe are utilized to form two channels, the first filter and the second filter are used and standby or work simultaneously, after one filter is blocked, the valves on the two sides of the filter are closed, and the valves on the two sides of the other filter are opened to clean the filter, so that the filter can be cleaned without stopping the machine; and the operation reliability of the heat exchange system is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of plate heat exchangers, and specifically relates to a liquid inlet pipe structure for plate heat exchangers. Background Technology

[0002] Plate heat exchangers, as highly efficient and compact heat exchange devices, have been widely used in industrial fields such as petrochemicals, district heating, and refrigeration and air conditioning, thanks to their heat transfer coefficients per unit volume that are 3-5 times higher than those of traditional shell-and-tube heat exchangers. Their typical structure consists of several corrugated metal plates stacked together by vacuum brazing or rubber gaskets, forming an alternating network of hot and cold medium flow channels. Statistics show that approximately 37% of plate heat exchanger malfunctions originate from blockage of the plate channels caused by fluid impurities. As the core component for medium distribution, the structural rationality of the inlet pipe directly determines the uniformity of fluid distribution and the reliability of system operation.

[0003] Traditionally, plate heat exchangers typically employ a single straight pipe design for the liquid inlet pipe, with a pre-filter at its front end to remove impurities from the fluid and prevent them from entering the gaps between the heat exchange plates and causing blockage or wear. However, this design has significant drawbacks: once the pre-filter becomes clogged due to prolonged operation, it affects the inlet water pressure and flow rate of the plate heat exchanger. In this case, the pre-filter needs to be cleaned. Cleaning the filter in a single straight pipe inlet structure requires shutting down the entire system to remove and clean the filter, which not only disrupts the continuous operation of the production line but also increases maintenance costs and operational complexity. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an inlet pipe structure for plate heat exchangers, so as to overcome the limitations of the prior art, ensure heat exchange efficiency, and enable filter cleaning without shutting down the machine.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A liquid inlet pipe structure for a plate heat exchanger includes a first bypass pipe and a second bypass pipe. One end of the first bypass pipe and the second bypass pipe are connected by a first connecting pipe, and the other end is connected by a second connecting pipe. A liquid inlet pipe is connected to one side of the first connecting pipe, and a liquid outlet pipe is connected to one side of the second connecting pipe. The liquid outlet pipe is connected to the medium inlet of the plate heat exchanger. A first valve, a first filter, and a second valve are sequentially connected to the first bypass pipe. A third valve, a second filter, and a fourth valve are sequentially connected to the second bypass pipe. When the plate heat exchanger is working, the first valve and the second valve are open, and the third valve and the fourth valve are closed. The first filter and the second filter are used in pairs, with one filter on standby. Alternatively, the first valve, the second valve, the third valve, and the fourth valve are all open, and the first filter and the second filter work simultaneously.

[0007] Furthermore, both the first filter and the second filter include an upper shell and a lower shell, which are connected by a nut. The upper shell has a liquid inlet on one side and a liquid outlet on the other side. The liquid outlet adopts a bent pipe structure, with one end of the bent pipe structure extending into the upper shell and having a connector. A filter basket is connected to the lower part of the connector.

[0008] Furthermore, the filter basket is snap-fitted or threaded onto the connector.

[0009] Furthermore, a fifth valve is provided on the liquid outlet pipe, and a drain pipe is connected to the lower part of the lower shell. A sixth valve is provided on the drain pipe. When the first filter and the second filter are slightly clogged, the fifth valve is closed, and the first valve, the second valve, the third valve, and the fourth valve are opened to form a circuit with the first connecting pipe, the first bypass pipe, the second connecting pipe, and the second bypass pipe. The sixth valve is then opened to backwash and clean the filter basket in the first filter or the second filter.

[0010] Furthermore, the first bypass pipe and the second bypass pipe are arranged horizontally or vertically.

[0011] Furthermore, it also includes several legs, each leg having a clamp on its upper part. When the first bypass pipe and the second bypass pipe are arranged horizontally, the clamp is installed at both ends of the first bypass pipe and the second bypass pipe; when the first bypass pipe and the second bypass pipe are arranged vertically, the clamp is only installed at both ends of the second bypass pipe.

[0012] Furthermore, the lower part of the outrigger is provided with a sleeve, and the outrigger is threadedly connected to the sleeve.

[0013] The beneficial effects of this utility model are:

[0014] 1) This utility model utilizes a first bypass pipe and a second bypass pipe to form a dual channel. The first filter and the second filter are used in one and standby or work simultaneously. When one filter is blocked, the valves on both sides of the filter are closed and the valves on both sides of the other filter are opened to clean the filter. This achieves filter cleaning without stopping the machine and ensures the reliability of the heat exchange system.

[0015] 2) A fifth valve is installed on the liquid outlet pipe, and a drain pipe and a sixth valve are installed at the bottom of the lower shell. When the first and second filters are slightly clogged, the fifth valve is closed, and the first, second, third, and fourth valves are opened to form a circuit with the first connecting pipe, the first bypass pipe, the second connecting pipe, and the second bypass pipe. The sixth valve is then opened to backwash and clean the filter basket in the first or second filter, thus achieving filter cleaning without disassembly.

[0016] 3) The first and second bypass pipes can be arranged horizontally or vertically according to the mounting holes of the plate heat exchanger, which improves the flexibility of the liquid inlet pipe structure installation.

[0017] 4) By setting height-adjustable support legs, the liquid inlet pipe structure is supported, avoiding bending and deformation at the medium inlet of the plate heat exchanger caused by the cantilever structure of the liquid inlet pipe structure. Attached Figure Description

[0018] Appendix Figure 1 This is an assembly diagram of Embodiment 1 of this utility model.

[0019] Appendix Figure 2 This is a schematic diagram of the interior of the first filter.

[0020] Appendix Figure 3 This is an assembly diagram of Embodiment 2 of this utility model.

[0021] In the diagram, 1. Inlet pipe; 2. First bypass pipe; 3. First valve; 4. First filter; 5. Second valve; 6. First connecting pipe; 7. Second connecting pipe; 8. Outlet pipe; 9. Second bypass pipe; 10. Third valve; 11. Second filter; 12. Fourth valve; 13. Support leg; 14. Sleeve; 15. Fifth valve; 16. Upper shell; 17. Lower shell; 18. Nut; 19. Liquid inlet; 20. Liquid outlet; 21. Connector; 22. Filter basket; 23. Drain pipe; 24. Sixth valve. Detailed Implementation

[0022] The following will be combined with the appendix Figures 1-3The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Example 1

[0025] like Figure 1 As shown, an inlet pipe structure for a plate heat exchanger includes a first bypass pipe 2 and a second bypass pipe 9. One end of the first bypass pipe 2 and the second bypass pipe 9 are connected by a first connecting pipe 6, and the other end is connected by a second connecting pipe 7. An inlet pipe 1 is connected to one side of the first connecting pipe 6, and an outlet pipe 8 is connected to one side of the second connecting pipe 7. The outlet pipe 8 is connected to the medium inlet of the plate heat exchanger. A first valve 3, a first filter 4, and a second valve 5 are sequentially connected to the first bypass pipe 2. A third valve 10, a second filter 11, and a fourth valve 12 are sequentially connected to the second bypass pipe 9. When the plate heat exchanger is working, the first valve 3 and the second valve 5 are open, and the third valve 10 and the fourth valve 12 are closed. The first filter 3 and the second filter 11 are used in pairs, with one on standby. Alternatively, the first valve 3, the second valve 5, the third valve 10, and the fourth valve 12 are all open, and the first filter 3 and the second filter 11 work simultaneously to ensure the flow rate and heat exchange efficiency of the plate heat exchanger. When the first filter 4 becomes clogged, the first valve 3 and the second valve 5 are closed, and the third valve 10 and the fourth valve 12 are opened, allowing the heat exchange medium to enter the plate heat exchanger after being filtered by the second filter 11. At the same time, the first filter 4 is cleaned. Similarly, when the second filter 11 becomes clogged, the third valve 10 and the fourth valve 12 are closed, and the first valve 3 and the second valve 5 are opened. This achieves filter cleaning without shutting down the system, ensuring the reliability of the heat exchange system.

[0026] like Figure 2As shown, both the first filter 4 and the second filter 11 include an upper shell 16 and a lower shell 17, which are connected by a nut 18. The upper shell 16 has a liquid inlet 19 on one side and a liquid outlet 20 on the other side. The liquid outlet 20 adopts a bent pipe structure, with one end of the bent pipe extending into the upper shell 16 and having a connector 21. A filter basket 22 is connected to the lower part of the connector 21. The heat exchange medium enters the upper shell 16 and the lower shell 17 through the liquid inlet 19. Impurities are blocked by the filter basket 22, and the filtered heat exchange medium flows from the inside of the filter basket 22 to the liquid outlet 20.

[0027] The filter basket 22 is snapped or threaded to the connector 21. In this embodiment, the filter basket 22 and the connector 21 are threaded to facilitate quick disassembly and maintenance of the filter basket 22.

[0028] like Figure 1 As shown, the outlet pipe 8 is equipped with a fifth valve 15, such as... Figure 2 As shown, a drain pipe 23 is connected to the lower part of the lower shell 17, and a sixth valve 24 is provided on the drain pipe 23. When the first filter 4 and the second filter 11 are slightly clogged, the fifth valve 15 is closed, and the first valve 3, the second valve 5, the third valve 10 and the fourth valve 12 are opened to form a circuit with the first connecting pipe 6, the first bypass pipe 2, the second connecting pipe 7 and the second bypass pipe 9. The sixth valve 24 is then opened to backwash and clean the filter basket 22 in the first filter 4 or the second filter 11, thus achieving cleaning of the filter without disassembly. In order to ensure the cleaning effect of the filter, only one of the sixth valves 24 in the first filter 4 or the second filter 11 is opened. After one filter is cleaned, the sixth valve 24 of that filter is closed, and then the sixth valve 24 of the other filter is opened for cleaning.

[0029] like Figure 1 As shown, in this embodiment, the first bypass pipe 2 and the second bypass pipe 9 are arranged horizontally.

[0030] like Figure 1 As shown, it also includes several support legs 13. The upper part of the support legs 13 is provided with a clamp, which is installed at both ends of the first bypass pipe 2 and the second bypass pipe 9. The support legs 13 support the liquid inlet pipe structure, avoiding bending and deformation of the medium inlet of the plate heat exchanger caused by the cantilever structure of the liquid inlet pipe structure.

[0031] like Figure 1 , Figure 3 As shown, the lower part of the support leg 13 is provided with a sleeve 14, and the support leg 13 is threadedly connected to the sleeve 14, which facilitates the adjustment of the support height of the support leg 13.

[0032] Example 2

[0033] Unlike Example 1, as Figure 3 As shown, the first bypass pipe 2 and the second bypass pipe 9 are arranged perpendicularly. The clamps at the upper end of the support leg 13 are only installed at both ends of the second bypass pipe 9.

[0034] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A liquid inlet pipe structure for a plate heat exchanger, comprising a first bypass pipe (2) and a second bypass pipe (9), characterized in that, One end of the first bypass pipe (2) and the second bypass pipe (9) is connected through the first connecting pipe (6), and the other end is connected through the second connecting pipe (7), one side of the first connecting pipe (6) is connected with the liquid inlet pipe (1), one side of the second connecting pipe (7) is connected with the liquid outlet pipe (8), and the liquid outlet pipe (8) is connected with the medium inlet of the plate heat exchanger; the first bypass pipe (2) is sequentially connected with the first valve (3), the first filter (4) and the second valve (5), and the second bypass pipe (9) is sequentially connected with the third valve (10), the second filter (11) and the fourth valve (12), when the plate heat exchanger works, the first valve (3) and the second valve (5) are opened, the third valve (10) and the fourth valve (12) are closed, the first filter (4) and the second filter (11) are used alternately, or the first valve (3), the second valve (5), the third valve (10) and the fourth valve (12) are all opened, and the first filter (4) and the second filter (11) work simultaneously.

2. A liquid inlet pipe structure for a plate heat exchanger according to claim 1, characterized in that The first filter (4) and the second filter (11) both comprise an upper shell (16) and a lower shell (17), and the upper shell (16) and the lower shell (17) are connected through a nut (18), one side of the upper shell (16) is provided with a liquid inlet (19), and the other side is provided with a liquid outlet (20), the liquid outlet (20) adopts a bend pipe structure, one end of the bend pipe structure extends into the upper shell (16) and is provided with a connecting head (21), and the connecting head (21) is connected with a filter basket (22) at the lower part.

3. A liquid inlet pipe structure for a plate heat exchanger according to claim 2, characterized in that The filter basket (22) is clamped or threaded with the connecting head (21).

4. A liquid inlet pipe structure for a plate heat exchanger according to claim 2, characterized in that The liquid outlet pipe (8) is provided with a fifth valve (15), the lower part of the lower shell (17) is connected with a blowdown pipe (23), and the blowdown pipe (23) is provided with a sixth valve (24); when the first filter (4) and the second filter (11) are slightly blocked, the fifth valve (15) is closed, the first valve (3), the second valve (5), the third valve (10) and the fourth valve (12) are opened, the first connecting pipe (6), the first bypass pipe (2), the second connecting pipe (7) and the second bypass pipe (9) form a loop, and the sixth valve (24) is opened, so that the filter basket (22) in the first filter (4) or the second filter (11) is backwashed and cleaned.

5. A liquid inlet tube structure for a plate heat exchanger according to any one of claims 1 - 4, characterized in that The first bypass pipe (2) and the second bypass pipe (9) are horizontally arranged or the first bypass pipe (2) and the second bypass pipe (9) are vertically arranged.

6. A liquid inlet tube structure for a plate heat exchanger according to claim 5, characterized in that A plurality of legs (13) are further included, the upper part of the leg (13) is provided with a hoop, when the first bypass pipe (2) and the second bypass pipe (9) are horizontally arranged, the hoop is installed at both ends of the first bypass pipe (2) and the second bypass pipe (9); when the first bypass pipe (2) and the second bypass pipe (9) are vertically arranged, the hoop is only installed at both ends of the second bypass pipe (9).

7. A liquid inlet tube structure for a plate heat exchanger according to claim 6, characterized in that The lower part of the leg (13) is provided with a sleeve (14), and the leg (13) is threaded with the sleeve (14).

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