Backwashing device of spiral-plate heat exchanger

Abstract

The utility model relates to the technical field of backwashing of spiral-plate heat exchangers, in particular to a backwashing device of a spiral-plate heat exchanger, which comprises a backwashing pipe and a feeding assembly, the backwashing pipe is used for communicating with a discharge pipe, and the feeding assembly communicates with the discharge pipe and is located on a liquid inlet path of the backwashing pipe. When the spiral-plate heat exchanger needs to be subjected to backwashing, a worker firstly installs a backwashing pipe on the discharging pipe, then adds cleaning powder into the feeding assembly, after the cleaning powder is accumulated in the feeding assembly, the worker injects clean water into the backwashing pipe, the clean water enters each spiral channel through the discharging pipe, and the spiral-plate heat exchanger is subjected to backwashing. And finally, the water flows out through each feeding pipe, so that the backwashing of the spiral channel is realized. And in the flowing process of the clear water, the clear water passes through the feeding assembly, so that the powder for cleaning in the feeding assembly is melted in the clear water, and the oil dirt impurities in the spiral channel are removed.

Description

Technical Field

[0001] The present application relates to the technical field of backwashing of spiral plate heat exchangers, and in particular to a backwashing device for a spiral plate heat exchanger. Background Art

[0002] A spiral plate heat exchanger is constructed from two parallel metal plates rolled together to form two concentric spiral channels. Spacers are welded between the plates to maintain the channel spacing, and a central partition separates the two spiral channels. The outer walls of the spiral plate heat exchanger are equipped with a cold material feed pipe, a cold material discharge pipe, a hot material feed pipe, and a hot material discharge pipe. The cold material feed pipe and the cold material discharge pipe communicate with one of the spiral channels, while the hot material feed pipe and the hot material discharge pipe communicate with the other spiral channel. During operation, the cold material passes through the cold material feed pipe, and the hot material passes through the hot material feed pipe, then flows in opposite directions in the two spiral channels, ultimately being discharged through the cold material discharge pipe and the hot material discharge pipe, achieving heat exchange.

[0003] For ease of description, the hot material discharge pipe and the cold material discharge pipe are collectively referred to as the discharge pipe, and the hot material feed pipe and the cold material feed pipe are collectively referred to as the feed pipe. After the spiral plate heat exchanger has been in operation for a long time, its internal channels need to be cleaned. During cleaning, the staff connects the discharge pipe to the backwash pipe, then injects water into the backwash pipe. The water flows through the discharge pipe and enters each spiral channel, thereby cleaning the internal channels.

[0004] However, although the above cleaning method can clean simple dirt in the channel, when the channel is adhered to difficult-to-clean dirt or impurities such as oil, clean water cannot completely clean it, which seriously affects the cleaning effect of the spiral plate heat exchanger. Utility Model Content

[0005] In order to facilitate the backwashing of a spiral plate heat exchanger by adding chemicals, the present application provides a backwashing device for a spiral plate heat exchanger.

[0006] The backwash device of the spiral plate heat exchanger provided in this application adopts the following technical solution:

[0007] A backwash device for a spiral plate heat exchanger comprises a backwash pipe and a feeding assembly, wherein the backwash pipe is used to connect to the discharge pipe, and the feeding assembly is connected to the discharge pipe and is located on the liquid inlet path of the backwash pipe.

[0008] By adopting the above technical solution, when the spiral plate heat exchanger needs to be backwashed, the staff will first remove the pipe fittings originally connected to the discharge pipe and install the backwash pipe, and then add cleaning powder to the feeding assembly. When the cleaning powder accumulates in the feeding assembly, the staff will inject clean water into the backwash pipe. The clean water enters each spiral channel through the discharge pipe and finally flows out through each feed pipe to achieve backwashing of the spiral channel. During the flow of clean water, the clean water passes through the feeding assembly, causing the cleaning powder in the feeding assembly to melt in the clean water, thereby achieving the removal of oil and impurities in the spiral channel. The above technical solution improves the convenience of adding cleaning powder through the setting of the feeding assembly, making it easier to dosing and backwashing the spiral plate heat exchanger.

[0009] Preferably, the feeding assembly includes a feeding pipe and a conducting pipe, the conducting pipe is connected to the discharge pipe, the feeding pipe passes through the conducting pipe and enters the discharge pipe, the feeding pipe is located in the discharge pipe and has a plurality of through holes on its body, the feeding pipe is detachably connected to the conducting pipe, and a second sealing plug is provided in the pipe mouth of the feeding pipe.

[0010] By adopting the above technical solution, the staff unscrews the second sealing plug and pours an appropriate amount of cleaning powder into the feeding pipe, where the cleaning powder accumulates. After the cleaning powder is added, the staff tightens the second sealing plug at the mouth of the feeding pipe to seal it. During backwashing, the staff turns on the external water source, which enters the discharge pipe through the backwash pipe. As the water flows through the discharge pipe, it passes through the feeding pipe and dissolves the cleaning powder in the feeding pipe, thus ensuring that the water entering the spiral channel has the ability to clean impurities such as oil.

[0011] Preferably, an external threaded ring is provided on the outer wall of the guiding tube near the pipe mouth, and a connecting ring is provided on the outer wall of the feeding tube near its pipe mouth. A connecting ring groove for accommodating the external threaded ring is opened on the side of the connecting ring facing the discharge pipe, and an internal threaded section that cooperates with the thread of the external threaded ring is provided on the inner wall of the connecting ring groove.

[0012] By adopting the above technical solution, after the feeding pipe is fully inserted into the conducting pipe, the staff rotates the connecting ring so that the connecting ring groove cooperates with the external thread ring thread to achieve the effect of tightly connecting the feeding pipe and the conducting pipe.

[0013] Preferably, a sealing ring groove is formed on a side of the external threaded ring facing the connecting ring, and a sealing ring is provided in the sealing ring groove.

[0014] By adopting the above technical solution, the sealing ring improves the sealing between the external thread ring and the connecting ring, thereby improving the sealing between the pipe opening of the conducting pipe and the pipe opening of the feeding pipe.

[0015] Preferably, the feeding assembly includes a guide pipe and a feeding pipe, one end of the guide pipe is closed and the other end is open, the closed end of the guide pipe is located in the discharge pipe, the guide pipe is provided with a connector that is sealed with the discharge pipe, and the open end of the guide pipe is connected to a quick connector for connecting to the backwash pipe; the feeding pipe is connected to the guide pipe, and a first sealing plug is provided in the pipe mouth of the feeding pipe.

[0016] By adopting this technical solution, when backwashing the heat exchanger, the operator first inserts the guide tube into the discharge tube. When the connector fits into the flange on the discharge tube, the operator uses a bolt assembly to securely connect the connector to the flange on the discharge tube, thereby achieving a tight connection between the guide tube and the discharge tube. Next, the operator unscrews the first sealing plug and pours an appropriate amount of cleaning powder into the feed tube. After the cleaning powder is added, the operator first tightens the first sealing plug onto the nozzle of the feed tube to seal the feed tube. Then, the operator uses a quick connector to connect the backwash tube and the guide tube.

[0017] The end of the backwash pipe away from the guide pipe is connected to an external water source. When performing backwashing, the staff turns on the external water source, and the external water source enters the guide pipe through the backwash pipe. In the process of passing through the guide pipe, the water flow dissolves the cleaning powder in the medicine storage cavity, so that the water flow entering the spiral channel has the ability to clean impurities such as oil.

[0018] Preferably, the guide tube includes an outer sleeve and an inner limiting tube, the inner limiting tube is arranged in the outer sleeve, a medicine storage cavity is provided between the outer wall of the inner limiting tube and the inner wall of the outer sleeve, and the feeding tube is communicated with the medicine storage cavity; the outer sleeve is located in the tube body of the discharge tube and the tube body of the inner limiting tube are respectively provided with a plurality of liquid outlet holes.

[0019] By adopting the above technical solution, the external water source enters the guide pipe through the backwash pipe. Since the end of the guide pipe extending into the discharge pipe is closed, the water can only flow out from the liquid outlet. In the process of passing through the liquid outlet, the water dissolves the cleaning powder in the medicine storage cavity, so that the water entering the spiral channel has the ability to clean impurities such as oil.

[0020] In summary, this application has the following beneficial technical effects:

[0021] 1. The setting of the feeding component improves the convenience of adding cleaning powder and facilitates the dosing and backwashing of the spiral plate heat exchanger.

[0022] 2. External water source enters the guide pipe through the backwash pipe. Since the end of the guide pipe extending into the discharge pipe is closed, the water can only flow out from the liquid outlet. In the process of passing through the liquid outlet, the water dissolves the cleaning powder in the medicine storage cavity, so that the water entering the spiral channel has the ability to clean impurities such as oil.

[0023] 3. During backwashing, the staff turns on the external water source, and the external water source enters the discharge pipe through the backwash pipe. In the process of passing through the discharge pipe, the water flow will pass through the feeding pipe and dissolve the cleaning powder in the feeding pipe, so that the water flow entering the spiral channel has the ability to clean impurities such as oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the backwashing device of the spiral plate heat exchanger in Example 1.

[0025] Figure 2 This is an exploded view of the backwashing device of the spiral plate heat exchanger in Example 1.

[0026] Figure 3 It is a structural schematic diagram of the backwashing device of the spiral plate heat exchanger in Example 2.

[0027] Figure 4 This is an exploded view of the backwashing device of the spiral plate heat exchanger in Example 2.

[0028] Figure 5 This is a cross-sectional view of the guide tube in Example 2.

[0029] Explanation of the accompanying reference numerals: 1. backwash pipe; 2. discharge pipe; 301. feeding pipe; 302. guide pipe; 303. external threaded ring; 304. connecting ring; 305. sealing ring; 306. first sealing plug; 307. first threaded portion; 308. first end cap; 309. first sealing gasket; 310. connecting flange; 311. guide pipe; 312. feeding pipe; 313. outer sleeve; 314. inner limiting pipe; 315. receiving ring; 316. medicine storage chamber; 317. liquid outlet; 318. connecting piece; 319. second sealing plug; 320. second threaded portion; 321. second end cap; 322. second sealing gasket. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-5 This application is described in further detail.

[0031] In order to facilitate the backwashing of a spiral plate heat exchanger by adding chemicals, the present application discloses a backwashing device for a spiral plate heat exchanger.

[0032] Example 1

[0033] Reference Figure 1 The backwash device of the spiral plate heat exchanger includes a backwash pipe 1 and a feeding assembly. The backwash pipe 1 is used to connect to the discharge pipe 2. The feeding assembly is connected to the discharge pipe 2 and is located on the liquid inlet path of the backwash pipe 1.

[0034] When backwashing the spiral plate heat exchanger, staff add cleaning powder to the feed assembly. Once the cleaning powder accumulates inside, staff inject clean water into backwash pipe 1. The clean water flows through discharge pipe 2 into each spiral channel and eventually flows out through each feed pipe, completing the backwash of the spiral channel. As the clean water flows through the feed assembly, the cleaning powder inside the feed assembly dissolves in the clean water, thereby removing oil and impurities from the spiral channel.

[0035] Reference Figure 1 and Figure 2 The feeding assembly includes a feeding pipe 301 and a conducting pipe 302.

[0036] Reference Figure 1 and Figure 2 The conducting pipe 302 is connected to the outer wall of the discharge pipe 2, and the conducting pipe 302 is in communication with the inner cavity of the discharge pipe 2. The feeding pipe 301 passes through the conducting pipe 302 and enters the discharge pipe 2. The end of the feeding pipe 301 extending into the discharge pipe 2 is closed, and the end of the feeding pipe 301 located outside the discharge pipe 2 is open.

[0037] Reference Figure 1 and Figure 2 The feeding pipe 301 is detachably connected to the conducting pipe 302. The outer wall of the conducting pipe 302 near the pipe opening is sheathed with an externally threaded ring 303, which is fixedly connected to the conducting pipe 302 by welding. A connecting ring 304 is sheathed on the outer wall of the feeding pipe 301 near the pipe opening, which is fixedly connected to the feeding pipe 301 by welding. The connecting ring 304 has a connecting ring groove on the side facing the discharge pipe 2 for accommodating the externally threaded ring 303. The inner wall of the connecting ring groove is provided with an internally threaded section that threads with the externally threaded ring 303. A sealing ring groove is provided on the side of the externally threaded ring 303 facing the connecting ring 304, and a sealing ring 305 is disposed within the sealing ring groove.

[0038] Reference Figure 1 and Figure 2The feeding pipe 301, located within the discharge pipe 2, has a plurality of through-holes formed therein. A first sealing plug 306 is provided at the orifice of the feeding pipe 301. The first sealing plug 306 comprises a first threaded portion 307 threadedly connected to the orifice of the feeding pipe 301 and a first end cap 308 fixedly connected to the first threaded portion 307. A first sealing gasket 309 is provided at the orifice of the feeding pipe 301. The first sealing gasket is fitted over the first threaded portion 307 and is compressed between the first end cap 308 and the orifice of the feeding pipe 301.

[0039] Reference Figure 1 and Figure 2 One end of the backwash pipe 1 is connected to the external water source, and the other end is provided with a connecting flange 310. The connecting flange 310 is fixedly connected to the backwash pipe 1 by welding. The backwash pipe 1 is connected to the discharge pipe 2 through the cooperation of the connecting flange 310 and the bolt assembly.

[0040] When backwashing the heat exchanger is required, the staff first unscrews the first sealing plug 306, removes the first sealing gasket 309, and pours an appropriate amount of cleaning powder into the feeding pipe 301, where the cleaning powder accumulates. After the cleaning powder is added, the staff first puts the first sealing gasket 309 onto the first sealing plug 306 and then tightens the first sealing plug 306 onto the opening of the feeding pipe 301 to seal the feeding pipe 301.

[0041] When performing backwashing, the staff turns on the external water source, and the external water source enters the discharge pipe 2 through the backwash pipe 1. In the process of passing through the discharge pipe 2, the water flow will pass through the feeding pipe 301 and dissolve the cleaning powder in the feeding pipe 301, so that the water flow entering the spiral channel has the ability to clean impurities such as oil.

[0042] After the water flows through the discharge pipe 2, it passes through the spiral channel and the feed pipe in sequence to achieve backwashing of the heat exchanger. Due to the provision of the feeding component, the addition of cleaning powder is more convenient, thereby improving the convenience of backwashing the spiral plate heat exchanger.

[0043] Example 2

[0044] The difference between this embodiment and embodiment 1 lies in the feeding component. This embodiment provides another feeding component. Figure 3 The feeding assembly includes a guide tube 311 and a feeding tube 312 .

[0045] Reference Figure 2 and Figure 3The guide tube 311 has one closed end and an open end. The closed end of the guide tube 311 is located inside the discharge tube 2. The guide tube 311 includes an outer sleeve 313 and an inner limiting tube 314. Both the outer sleeve 313 and the inner limiting tube 314 are tubes with one closed end and the other open end. The inner limiting tube 314 is disposed inside the outer sleeve 313. The closed end of the outer sleeve 313 and the closed end of the inner limiting tube 314 are located at the same end, and the open end of the outer sleeve 313 and the open end of the inner limiting tube 314 are located at the same end.

[0046] Reference Figure 2 and Figure 3 A receiving ring 315 is positioned in the gap between the open ends of the outer sleeve 313 and the inner restricting tube 314. The receiving ring 315 is secured by welding to the gap between the open ends of the outer sleeve 313 and the inner restricting tube 314. A gap is defined between the outer wall of the inner restricting tube 314 and the inner wall of the outer sleeve 313, defining a drug storage cavity 316. Several liquid outlet holes 317 are formed in the outer sleeve 313 located within the discharge tube 2 and the inner restricting tube 314.

[0047] Reference Figure 2 and Figure 3 The guide tube 311 is provided with a connector 318 that is sealed with the discharge tube 2. The connector 318 is a flange that is sleeved outside the outer sleeve 313 and fixedly connected to the outer sleeve 313 by welding. When the guide tube 311 is inserted into the discharge tube 2, the connector 318 fits against the flange on the discharge tube 2. The connector 318 is fastened to the flange on the discharge tube 2 by a bolt assembly, thereby fixing the guide tube 311 in the discharge tube 2.

[0048] Reference Figure 2 and Figure 3 The feeding pipe 312 is connected to the guide pipe 311. Specifically, the feeding pipe 312 is fixedly connected to the outer wall of the outer sleeve 313 and communicates with the medicine storage cavity 316. When the guide pipe 311 is tightly connected to the discharge pipe 2, the feeding pipe 312 is exposed to the air.

[0049] Reference Figure 1-Figure 3 A second sealing plug 319 is threadedly connected to the nozzle of the feeding tube 312. The second sealing plug 319 includes a second threaded portion 320 threadedly connected to the nozzle of the feeding tube 312 and a second end cap 321 fixedly connected to the second threaded portion 320. A second sealing gasket 322 is provided at the nozzle of the feeding tube 312. The second sealing gasket is mounted outside the second threaded portion 320 and is compressed between the second end cap 321 and the nozzle of the feeding tube 312.

[0050] Reference Figure 1-Figure 3 The open end of the guide pipe 311 is connected to the backwash pipe 1 through a flange

[0051] When the heat exchanger needs to be backwashed, the staff first inserts the guide pipe 311 into the discharge pipe 2. When the connecting piece 318 fits with the flange on the discharge pipe 2, the staff uses the bolt assembly to fasten the connecting piece 318 to the flange on the discharge pipe 2, thereby achieving a fastened connection between the guide pipe 311 and the discharge pipe 2.

[0052] Next, the staff unscrews the second sealing plug 319, removes the second sealing gasket 322, and pours an appropriate amount of cleaning powder into the feeding tube 312. The cleaning powder passes through the feeding tube 312 and enters the drug storage chamber 316. After the cleaning powder is added, the staff first fits the second sealing gasket 322 onto the second sealing plug 319 and then tightens the second sealing plug 319 onto the nozzle of the feeding tube 312 to seal the feeding tube 312.

[0053] Then, the staff connects the backwash pipe 1 to the guide pipe 311, and the end of the backwash pipe 1 away from the guide pipe 311 is connected to the external water source. When performing the backwash work, the staff turns on the external water source, and the external water source enters the guide pipe 311 through the backwash pipe 1. Since the end of the guide pipe 311 extending into the discharge pipe 2 is closed, the water flow can only flow out from the liquid outlet 317. In the process of passing through the liquid outlet 317, the water flow dissolves the cleaning powder in the medicine storage chamber 316, so that the water flow entering the spiral channel has the ability to clean impurities such as oil.

[0054] After passing through the guide pipe 311, the water flows through the discharge pipe 2, the spiral channel and the feed pipe in sequence, thereby achieving backwashing of the heat exchanger. The provision of a feeding assembly makes it easier to add cleaning powder, thereby improving the convenience of backwashing the spiral plate heat exchanger.

[0055] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A backwash device for a spiral plate heat exchanger, characterized in that: It comprises a backwash pipe (1) and a feeding assembly, wherein the backwash pipe (1) is used to connect to a discharge pipe (2), and the feeding assembly is connected to the discharge pipe (2) and is located on the liquid inlet path of the backwash pipe (1); The feeding assembly comprises a feeding pipe (301) and a conducting pipe (302), wherein the conducting pipe (302) is connected to the discharge pipe (2), and the feeding pipe (301) enters the discharge pipe (2) after passing through the conducting pipe (302). The feeding pipe (301) is located inside the discharge pipe (2) and has a plurality of through holes on its body. The feeding pipe (301) is detachably connected to the conducting pipe (302), and a second sealing plug (319) is provided in the pipe mouth of the feeding pipe (301).

2. The backwashing device for a spiral plate heat exchanger according to claim 1, characterized in that: The outer wall of the conducting tube (302) near the tube mouth is provided with an external threaded ring (303), and the outer wall of the feeding tube (301) near its tube mouth is provided with a connecting ring (304), and a connecting ring groove for accommodating the external threaded ring (303) is provided on the side of the connecting ring (304) facing the discharge tube (2), and an internal thread section that is threadedly matched with the external threaded ring (303) is provided on the inner wall of the connecting ring groove.

3. The backwashing device for a spiral plate heat exchanger according to claim 2, characterized in that: A sealing ring groove is formed on one side of the external threaded ring (303) facing the connecting ring (304), and a sealing ring (305) is provided in the sealing ring groove.

4. The backwashing device for a spiral plate heat exchanger according to claim 1, characterized in that: The feeding assembly comprises a guide tube (311) and a feeding tube (312), one end of the guide tube (311) is closed and the other end is open, the closed end of the guide tube (311) is located in the discharge tube (2), the guide tube (311) is provided with a connector (318) sealedly connected to the discharge tube (2), and the backwash tube (1) is connected to the guide tube (311); the feeding tube (312) is connected to the guide tube (311), and a first sealing plug (306) is provided in the tube mouth of the feeding tube (312).

5. The backwashing device for a spiral plate heat exchanger according to claim 4, characterized in that: The guide tube (311) includes an outer sleeve (313) and an inner limiting tube (314), wherein the inner limiting tube (314) is arranged in the outer sleeve (313), and a medicine storage cavity (316) is provided between the outer wall of the inner limiting tube (314) and the inner wall of the outer sleeve (313), and the feeding tube (312) is communicated with the medicine storage cavity (316); a plurality of liquid outlet holes (317) are respectively provided on the tube body of the outer sleeve (313) located inside the discharge tube (2) and the tube body of the inner limiting tube (314).

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