A steam heater structure for preventing water hammer

Abstract

This utility model discloses a steam heater structure for preventing water hammer, including two manifolds and multiple branch pipes; two sheet metal frames are provided between the two manifolds; multiple sleeve plates are provided between the two sheet metal frames; the sleeve plates abut against each of the branch pipes; two locking parts are provided between the two sheet metal frames; each locking part includes a threaded rod and two wing nuts. There are no bends, and the multiple branch pipes reduce pipe impact, completely avoiding water hammer. The sleeve plates increase the heat exchange area, balancing the temperature difference between the branch pipes and improving heat exchange efficiency. The sleeve plates and branch pipes are separate components, simplifying processing and reducing production costs; the threaded rods and wing nuts install the sleeve plates between the two sheet metal frames, allowing for flexible adjustment of the number of sleeve plates according to different working conditions.

Description

Technical Field

[0001] This utility model belongs to the field of steam heat exchanger technology, and in particular relates to a steam heater structure that is waterproof against water hammer. Background Technology

[0002] In the fields of rotary dehumidification, air dehumidification, air handling, dehumidifying air conditioning, and constant temperature and humidity, temperature control and heating are achieved using electric, steam, and thermal oil heating methods, with steam being the most commonly used. Steam heating involves connecting a high-pressure steam source provided by the municipality to the equipment's steam heat exchanger. Inside the steam heat exchanger, the high-pressure steam releases heat to the air, causing its temperature to drop and a phase change to occur. The steam condenses into condensate, which is then discharged through the outlet of the steam heat exchanger. During this process, the cold air absorbs the heat from the steam and becomes hot air, while the high-pressure hot steam releases heat and becomes a mixture of condensate and low-temperature steam.

[0003] Conventional steam heat exchangers typically employ a multi-row heat exchange tube structure, with each row connected by a U-shaped bend and the joints welded together using argon arc welding. When high-pressure steam releases heat, the resulting condensate flows at high speed, creating a powerful impact force between the condensate and the U-shaped bend of the heat exchanger. This powerful impact force is known as water hammer, and most of the water hammer force is generated by the obstruction of the U-shaped bend in the heat exchanger.

[0004] Nowadays, more and more users are using high-temperature, high-pressure steam to heat the steam, and then reusing the cooled, low-pressure steam (around 60°C) after the heat has been released. This cooled, low-pressure steam produces more condensate, which causes greater damage to the steam heater. The impact of water hammer often tears open the U-bends and welds of the heat exchanger first, causing high-pressure, high-temperature steam leakage, affecting the operation of the entire heat exchanger, and paralyzing the entire dehumidification and air conditioning system.

[0005] Chinese patent document CN211552504U discloses a steam heat exchanger and a steam heat exchange system. The steam heat exchanger includes a heat exchange coil, which comprises heat exchange tubes, a steam manifold, and a condensate manifold, both arranged horizontally. An inlet pipe is vertically connected to the steam manifold, allowing steam or steam mixed with condensate to enter the steam manifold through only one bend. Because the connection point between the steam manifold and the inlet pipe is near one end of the steam manifold, condensate in the inlet pipe can quickly flow into the steam manifold and heat exchange tubes on both sides of the connection point, preventing condensate from stagnating at the connection point and thus avoiding water hammer at the connection point, extending the service life of the steam heat exchanger.

[0006] The aforementioned patented solution avoids water hammer by reducing the use of elbows (i.e., only one elbow) and increasing the steam distribution path (i.e., increasing the number of heat exchange tubes). The steam flow path changes from a single linear path to multiple linear paths, resulting in varying steam flow velocities within each heat exchange tube. This leads to uneven temperature distribution across the tubes, with slow steam flow and insufficient heat exchange capacity in excessively cold areas, thus lowering overall heat exchange efficiency. While using finned heat exchange tubes increases the heat exchange rate, it does not balance the temperature between the tubes; low-temperature areas still reduce overall heat exchange efficiency. Furthermore, finned heat exchange tubes significantly increase manufacturing costs, hindering production and processing, especially for customized applications. Utility Model Content

[0007] To overcome the technical problem in existing technologies where increasing the number of heat exchange tubes used for steam diversion causes uneven temperature distribution among the tubes, resulting in slow steam flow and insufficient heat exchange capacity in low-temperature tubes, thus reducing heat exchange efficiency, and while finned heat exchange tubes can increase the heat exchange rate, they cannot balance the temperature differences between the tubes, and the low-temperature region still reduces heat exchange efficiency, this invention aims to provide a steam heater structure that prevents water hammer. By completely eliminating the use of elbows and incorporating multiple diversion tubes for steam diversion, water hammer is completely avoided. Simultaneously, multiple easily installed, tightly fitted fins are incorporated to balance the temperature differences between the diversion tubes, improving heat exchange efficiency. Furthermore, the improved design of the fitted fins reduces processing difficulty and manufacturing costs.

[0008] To achieve the above objectives, this utility model adopts the following technical solution: a steam heater structure for preventing water hammer, comprising two parallel manifolds and a plurality of branch pipes disposed between the two manifolds, with both ends respectively connected to the adjacent manifolds; two sheet metal frames parallel to the manifolds are disposed between the two manifolds; a plurality of sleeve plates parallel to the manifolds are disposed between the two sheet metal frames; wherein, the sleeve plates simultaneously abut against each of the branch pipes; two locking parts are disposed between the two sheet metal frames, respectively located at both ends of the sleeve plates; each locking part includes a threaded rod and two wing nuts threaded onto the threaded rod; the wing nuts abut against the side of the sheet metal frame away from the sleeve plates.

[0009] The steam heater structure has no bends, further reducing the occurrence of water hammer; the sleeve fins simultaneously contact each of the branch pipes, which can increase the heat exchange area on the one hand, and balance the heat between each of the branch pipes on the other hand, so that the heat between the steam heaters is evenly distributed, improving the efficiency and rate of heat exchange.

[0010] Furthermore, the sleeve includes an outer expansion piece, a plurality of through holes disposed on the outer expansion piece, and a plurality of spacer rings respectively disposed on the inner wall of the corresponding through holes; the diverter tube passes through the spacer rings, and the outer wall of the diverter tube is close to the inner wall of the spacer rings.

[0011] Optionally, a thermally conductive colloid is provided between the outer wall of the shunt tube and the inner wall of the spacer ring.

[0012] Optionally, the shunt tube is made to be interference-fitted with the spacer ring by means of a core-pulling and tube-expanding mechanism.

[0013] Optionally, the two collecting pipes are arranged longitudinally, with hot steam entering from the upper collecting pipe and flowing out from the lower collecting pipe; a pressure relief chamber is provided on the lower collecting pipe, the longitudinal cross-sectional area of ​​the pressure relief chamber being larger than the longitudinal cross-sectional area of ​​the collecting pipe; a drain outlet is provided at the lower end of the pressure relief chamber, and a valve is provided at the end of the drain outlet.

[0014] The valve can be used to drain the residual condensate in the steam heater structure. The increased cross-section of the pressure relief chamber helps to reduce stress concentration and water hammer at this location.

[0015] Specifically, the outer wall of the collecting pipe is provided with multiple branch pipes; both ends of the diverting pipe are respectively provided with flared openings; the branch pipes are located inside the flared openings; the inner diameter of the branch pipes is equal to the inner diameter of the diverting pipes.

[0016] The steam heater structure has equal inner diameters in its flow pipes, resulting in smooth steam flow and low resistance, which helps to improve flow efficiency and accelerate heat exchange efficiency and speed.

[0017] Specifically, the end of the flared opening is fully welded to the branch pipe using argon arc welding.

[0018] Preferably, the locking part further includes two spacer nuts threaded onto the threaded rod; the spacer nuts abut against the end of the sheet metal frame away from the adjacent wing nut.

[0019] Furthermore, the two opposite sides of the sheet metal frame are respectively provided with bends; the bends are located on the side of the sheet metal frame away from the sleeve sheet; the length direction of the bends is set along the length direction of the manifold.

[0020] Preferably, both the manifold and the branch pipe are linear straight pipes.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. The structure of this utility model has no bends at all, and multiple diversion pipes for steam diversion are set up to reduce pipeline impact and completely avoid the occurrence of water hammer.

[0023] 2. This utility model has multiple sleeved thin plates between each of the manifolds, which abut against each manifold. On the one hand, this increases the heat exchange area, and on the other hand, the sleeved thin plates balance the temperature difference between each manifold, making the temperature distribution of the entire structure uniform and helping to improve the heat exchange efficiency.

[0024] 3. The sleeve sheet and the diverter tube of this utility model are set separately. The sleeve sheet and each diverter tube are installed together by inserting them. The processing method of the diverter tube and the sleeve sheet is simple, which helps to reduce production costs. The threaded rod and the wing nut install each sleeve sheet between two sheet metal frames. The installation method is simple, and the number of sleeve sheets can be flexibly adjusted according to different working conditions, which is convenient for customized processing. Attached Figure Description

[0025] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of this utility model;

[0027] Figure 3 For the present utility model Figure 1 A magnified structural diagram of part A in the middle.

[0028] In the diagram: 1. Sheet metal frame; 11. Bending; 2. Diverter pipe; 3. Connecting sheet; 31. Outer expansion sheet; 32. Spacer ring; 4. Collector pipe; 5. Branch pipe; 6. Threaded rod; 7. Wing nut; 8. Pressure relief chamber; 81. Drain outlet. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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. They should not be construed as limiting the specific protection scope of this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In this description of the utility model, "a number" means two or more, unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, terms such as "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] See Figures 1-3 A steam heater structure for preventing water hammer includes two parallel manifolds 4 and a plurality of branch pipes 2 disposed between the two manifolds 4, with both ends connected to the adjacent manifolds 4; the manifolds 4 and the branch pipes 2 are all linear straight pipes.

[0034] Two sheet metal frames 1 parallel to the two collecting pipes 4 are provided between the two collecting pipes 4; a plurality of sleeve plates 3 parallel to the collecting pipes 4 are provided between the two sheet metal frames 1; the sleeve plates 3 simultaneously abut against each of the diverting pipes 2; the sleeve plates 3 include an outer expansion plate 31, a plurality of through holes provided through the outer expansion plate 31, and a plurality of spacer rings 32 respectively provided on the inner wall of the corresponding through holes; the diverting pipe 2 passes through the spacer rings 32, and the outer wall of the diverting pipe 2 is close to the inner wall of the spacer rings 32.

[0035] A thermally conductive colloid, such as thermally conductive silicone, is disposed between the outer wall of the shunt tube 2 and the inner wall of the spacer ring 32. In other embodiments, the shunt tube 2 may be press-fitted with the spacer ring 32 by a mechanism that expands the tube by pulling the core.

[0036] Two locking parts are provided between the two sheet metal frames 1, respectively located at both ends of the sleeve sheet 3; the locking part includes a threaded rod 6, two wing nuts 7 threadedly connected to the threaded rod 6, and two spacer nuts threadedly connected to the threaded rod 6; the wing nuts 7 abut against the side of the sheet metal frame 1 away from the sleeve sheet 3; the spacer nuts abut against the end of the sheet metal frame 1 away from the adjacent wing nut 7.

[0037] Two manifolds 4 are arranged longitudinally. Hot steam enters from the upper manifold 4 and flows out from the lower manifold 4. A pressure relief chamber 8 is provided on the lower manifold 4. The longitudinal cross-sectional area of ​​the pressure relief chamber 8 is larger than that of the manifold 4. A drain outlet 81 is provided at the lower end of the pressure relief chamber 8. A valve is provided at the end of the drain outlet 81.

[0038] The outer wall of the collecting pipe 4 is provided with multiple branch pipes 5; both ends of the diverting pipe 2 are respectively provided with flared openings; the branch pipes 5 are located inside the flared openings; the inner diameter of the branch pipes 5 is equal to the inner diameter of the diverting pipe 2. The ends of the flared openings are fully welded to the branch pipes 5, and the branch pipes 5 and the collecting pipe 4 are fully welded by argon arc welding.

[0039] The sheet metal frame 1 has two opposite sides with bends 11 respectively; the bends 11 are located on the side of the sheet metal frame 1 away from the connecting sheet 3; the length direction of the bends 11 is along the length direction of the collecting pipe 4.

[0040] The above description is only a specific embodiment of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A steam heater structure for a water hammer protection, characterized by: The device includes two parallel manifolds and multiple branch pipes disposed between the two manifolds, each with its ends connected to an adjacent manifold. Two sheet metal frames parallel to the manifolds are disposed between the two manifolds. Multiple sleeve plates parallel to the manifolds are disposed between the two sheet metal frames. Each sleeve plate simultaneously abuts against each branch pipe. Two locking portions are disposed between the two sheet metal frames, each located at one end of a sleeve plate. Each locking portion includes a threaded rod and two wing nuts threaded onto the threaded rod. The wing nuts abut against the side of the sheet metal frame away from the sleeve plates.

2. The vaporizer structure of claim 1, wherein: The sleeve includes an outer expansion piece, multiple through holes disposed on the outer expansion piece, and multiple spacer rings respectively disposed on the inner wall of the corresponding through holes; the diverter tube passes through the spacer rings, and the outer wall of the diverter tube is close to the inner wall of the spacer rings.

3. The steam heater structure as described in claim 2, characterized in that: A thermally conductive colloid is provided between the outer wall of the shunt tube and the inner wall of the spacer ring.

4. The vaporizer structure of claim 2, wherein: The shunt tube is expanded by a mechanism to make the shunt tube and the spacer ring interference fit.

5. The vaporizer structure of any of claims 1-4, wherein: The two collecting pipes are arranged longitudinally, with hot steam entering from the upper collecting pipe and exiting from the lower collecting pipe; a pressure relief chamber is provided on the lower collecting pipe, the longitudinal cross-sectional area of ​​which is larger than that of the collecting pipe; a drain outlet is provided at the lower end of the pressure relief chamber, and a valve is provided at the end of the drain outlet.

6. The vaporizer structure of any of claims 1-4, wherein: The outer wall of the collecting pipe is provided with multiple branch pipes; both ends of the diverting pipe are respectively provided with flared openings; the branch pipes are located inside the flared openings; the inner diameter of the branch pipes is equal to the inner diameter of the diverting pipes.

7. The vaporizer structure of claim 6, wherein: The end of the flared opening is fully welded to the branch pipe by argon arc welding.

8. The vaporizer structure of any of claims 1-4, wherein: The locking part also includes two spacer nuts threaded onto the threaded rod; the spacer nuts abut against the end of the sheet metal frame away from the adjacent wing nut.

9. The steam heater structure according to any one of claims 1-4, characterized in that: The two opposite sides of the sheet metal frame are respectively provided with bends; the bends are located on the side of the sheet metal frame away from the sleeve sheet; the length direction of the bends is set along the length direction of the manifold.

10. The steam heater structure according to any one of claims 1-4, characterized in that: Both the manifold and the branch pipe are linear straight pipes.

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