Cold trap for vacuum system
By introducing a packing layer and jacket design into the cold trap used in the vacuum system, combined with the alternating use of refrigerant and high-temperature medium, the problem of poor cooling effect is solved, efficient condensation and regeneration are achieved, and the service life of the vacuum system is extended.
Patent Information
- Application Number
- CN202422706597.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-07
AI Technical Summary
The cooling effect of cold traps used in existing vacuum systems is poor, which makes it easy for tiny droplets or solid particles in low-pressure gas to enter the vacuum pump, affecting the stability and life of the system.
A cold trap for a vacuum system was designed, which includes a packing layer and a cooling coil layer. The outer wall is provided with a jacket. By alternating the use of refrigerant and high-temperature medium, efficient cooling and regeneration are achieved, the condensation effect is enhanced, and the mass transfer efficiency is improved through the three-layer packing layer.
The cooling effect is improved, the possibility of tiny droplets or solid particles entering the vacuum pump is reduced, and the service life of the vacuum system is extended.
Smart Images
Figure CN223439204U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a vacuum system field, specifically relates to a cold trap for vacuum system. BACKGROUND
[0002] A cold trap is a device that prevents vapors or liquids from entering a measuring instrument from a system or from a measuring instrument into a system. It can provide a very low temperature surface, on which molecules can condense, and can improve the vacuum degree by one to two orders of magnitude. The cold trap is an important part of the stable operation of the vacuum system, and an efficient cold trap can ensure that the vacuum system can operate stably for a long time, reduce the failure of the vacuum pump, and prolong the service life of the vacuum pump.
[0003] In the prior art, the cold trap for the vacuum system is a coil pipe type cold trap, which cools the low-pressure gas by introducing a refrigerant to make the condensable gas cool and separate from the low-pressure gas. However, the heat transfer coefficient of the low-pressure gas is low, and it is not easy to be condensed, so a large heat exchange area is required. In the cold trap of the prior art, the condensable components in the low-pressure gas may still break through the cold trap and enter the subsequent vacuum pump after being condensed into liquid droplets or small solid particles, thereby causing the vacuum pump to fail or causing blockage and other adverse consequences. SUMMARY
[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the utility model is to provide a cold trap for a vacuum system, which has good cooling effect and improves the service life of the vacuum system.
[0005] To solve the above problems, the utility model provides the following technical scheme:
[0006] A cold trap for a vacuum system, comprising a sealed shell, a packing layer and a cooling coil layer are sequentially arranged in the shell from top to bottom, a vacuum inlet is arranged on the side wall of the shell at the cooling coil layer, a vacuum outlet and a high-temperature medium inlet are arranged on the top of the shell, a jacket is wrapped on the outer wall of the shell, a refrigerant is arranged in the jacket, a refrigerant inlet and a refrigerant outlet are arranged on the jacket, and a waste liquid discharge outlet is arranged on the bottom of the shell.
[0007] It should be noted that the cold trap of the present application can be divided into two working conditions during use, one is normal cooling condition, and the other is regeneration condition. In the normal cooling condition, the vacuum inlet and outlet are opened, the inlet of the high-temperature medium and the waste liquid discharge outlet are closed, the jacket of the cold trap shell and the cooling coil of the cooling coil layer are filled with refrigerant, and the low-pressure gas is first cooled by the cooling coil. Most of the condensable substances are condensed. A small part of the uncondensed substances collide with and exchange heat with the packing layer, and are again condensed. At the same time, the small liquid droplets or small solid particles in the gas are repeatedly collided with the packing and are blocked in the packing layer.
[0008] In the regeneration mode, the vacuum inlet and outlet are closed, the coolant of the jacket and cooling coil is closed, the high-temperature medium inlet is opened, the high-temperature medium is directly introduced into the cold trap, the condensed substances existing in the filler layer are all melted or blown to the bottom of the cold trap, the waste liquid is discharged from the waste liquid discharge outlet, and then the regeneration of the cold trap is completed.
[0009] The technical scheme of the utility model further includes that the inlet end and the outlet end of the jacket and the cooling coil layer are communicated with the coolant circulating device.
[0010] Further, the technical scheme of the utility model further includes that the cooling coil layer is provided with a cooling coil inlet and a cooling coil outlet, the coil of the cooling coil layer is a double helix coil, and the two coils in the double helix coil are arranged in parallel, so that the heat exchange area is increased, and the cooling efficiency is improved.
[0011] In order to improve the operability of the cold trap, the technical scheme of the utility model further includes that the inlet end and the outlet end of the jacket and the cooling coil layer, the vacuum inlet, the vacuum outlet, the high-temperature medium inlet and the waste liquid discharge outlet are all provided with valves.
[0012] The technical scheme of the utility model further includes that one side of the shell is provided with a heat medium generating device, and the outlet end of the heat medium generating device is communicated with the high-temperature medium inlet. The high-temperature medium can melt or blow all the condensed substances existing in the filler layer to the bottom of the cold trap, improve the heat exchange efficiency of the filler layer and realize the regeneration function of the filler layer.
[0013] The technical scheme of the utility model further includes that the filler layer is one or a combination of a grid filler layer, a corrugated filler layer and a pulse filler layer.
[0014] Further, the technical scheme of the utility model further includes that the filler layer is three layers, and the three layers of filler layers are sequentially a grid filler layer, a corrugated filler layer and a pulse filler layer from bottom to top. The grid filler layer at the bottom layer provides stable support for the upper filler layer and ensures good gas-liquid flowability. The corrugated filler layer in the middle can effectively increase the mass transfer area and improve the separation efficiency. The pulse filler layer at the top layer can further improve the mass transfer efficiency and reduce the possibility of blockage.
[0015] The technical scheme of the utility model further includes that the high-temperature medium introduced through the high-temperature medium inlet is one of steam and hot water.
[0016] The utility model has the beneficial effects that:
[0017] Compared with the prior art, the purpose of the utility model is to provide a cold trap for vacuum system with good cooling effect and long service life of vacuum system, the cold trap of the application is provided with filler layer and cooling coil layer, the outer wall of the cold trap is provided with jacket which can be filled with refrigerant, the top of the cold trap is provided with high temperature medium inlet, the application effectively improves the cooling effect of the cold trap and the service life of the vacuum system, solves the problem of insufficient heat exchange area of the cold trap in the prior art, and solves the problem of small liquid drops or small solid particles in low pressure gas breaking through the cold trap and entering the vacuum pump, affecting the service life of the vacuum system. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, for those skilled in the art, other drawings can also be obtained without creative labor on the premise of the drawings.
[0019] Figure 1 It is the structure diagram of the cold trap for vacuum system in the specific embodiment.
[0020] Among them, 1 is the shell, 2 is the cooling coil layer, 3 is the grid filler layer, 4 is the corrugated filler layer, 5 is the pulse filler layer, 6 is the vacuum inlet, 7 is the vacuum outlet, 8 is the high temperature medium inlet, 9 is the heat medium generating device, 10 is the waste liquid discharge port, 11 is the jacket, 12 is the refrigerant inlet, 13 is the refrigerant outlet, 14 is the cooling coil inlet, 15 is the cooling coil outlet, 16 is the refrigerant circulating device, 17 is the valve. DETAILED DESCRIPTION
[0021] In order to make the personnel in the technical field better understand the technical scheme in the utility model, the following will combine the drawings in the embodiment of the utility model, and the technical scheme in the embodiment of the utility model is described clearly and completely, obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor should belong to the scope of the protection of the utility model.
[0022] In the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the description of the description of the utility model for simplification, and does not indicate or imply that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as a limitation on the utility model.
[0023] As shown in the drawings, a cold trap for vacuum system comprises a sealed shell 1, a packing layer and a cooling coil layer 2 are arranged in the shell 1 from top to bottom, the coil of the cooling coil layer 2 is a double spiral coil, the packing layer is three layers, and the three layers of packing layer are a grid packing layer 3, a corrugated packing layer 4 and a pulse packing layer 5 from bottom to top. A vacuum inlet 6 is arranged on the side wall of the shell 1 at the cooling coil layer 2, a vacuum outlet 7 and a high-temperature medium inlet 8 are arranged on the top of the shell 1 respectively, a heat medium generating device 9 is arranged on one side of the shell 1, the discharge end of the heat medium generating device 9 is communicated with the high-temperature medium inlet 8, and the high-temperature medium is steam. A waste liquid discharge outlet 10 is arranged on the bottom of the shell 1.
[0024] An outer wall of the shell 1 is covered with a jacket 11, the jacket 11 is provided with a refrigerant, the jacket 11 is provided with a refrigerant inlet 12 and a refrigerant outlet 13, the cooling coil layer 2 is provided with a cooling coil inlet 14 and a cooling coil outlet 15, and the jacket 11 and the cooling coil layer 2 are communicated with a refrigerant circulating device 16. The refrigerant inlet 12 and the refrigerant outlet 13 of the jacket 11, the cooling coil inlet 14 and the cooling coil outlet 15, the vacuum inlet 6, the vacuum outlet 7, the high-temperature medium inlet 8 and the waste liquid discharge outlet 10 are all provided with valves 17.
[0025] The cold trap of the embodiment can be divided into two working conditions in use, one is a normal cooling working condition, and the other is a regeneration working condition. In the normal cooling working condition, the vacuum inlet and outlet are opened, the inlet of the high-temperature medium and the waste liquid discharge outlet are closed, the jacket of the cold trap shell and the cooling coil of the cooling coil layer are filled with refrigerant, low-pressure gas is first cooled by the cooling coil, and most of the condensable substances are condensed. A small part of the uncondensed substances collide with and exchange heat with the packing layer, are condensed again, and the tiny liquid drops or tiny solid particles in the gas are blocked in the packing layer after repeated collision with the packing layer.
[0026] In the regeneration working condition, the vacuum inlet and outlet are closed, the refrigerant of the jacket and the cooling coil is closed, the high-temperature medium inlet is opened, the high-temperature medium is directly introduced into the cold trap, the condensed substances existing in the packing layer are all melted or blown to the bottom of the cold trap, are discharged from the cold trap through the waste liquid discharge outlet, and the regeneration of the cold trap is completed. Through the above design, the cooling effect of the cold trap can be effectively improved, and the service life of the vacuum system is improved,
[0027] Although the utility model has been described in detail by referring to the drawings and in conjunction with the preferred embodiments, the utility model is not limited thereto. Without departing from the spirit and essence of the utility model, those skilled in the art can make various equivalent modifications or replacements to the embodiments of the utility model, and these modifications or replacements should be within the scope of the utility model, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, and these changes or replacements should be within the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.
Claims
1. A cold trap for a vacuum system, characterized in that: The invention comprises a sealed shell, in which a packing layer and a cooling coil layer are sequentially arranged from top to bottom. A vacuum inlet is provided on the side wall of the shell at the cooling coil layer, a vacuum outlet and a high-temperature medium inlet are provided on the top of the shell, an outer wall of the shell is covered with a jacket, a refrigerant is provided in the jacket, a refrigerant inlet and a refrigerant outlet are provided on the jacket, and a waste liquid outlet is provided on the bottom of the shell.
2. The cold trap for a vacuum system according to claim 1, characterized in that: The jacket and the feeding end and the discharging end of the cooling coil layer are all connected to the refrigerant circulation device.
3. The cold trap for a vacuum system according to claim 2, characterized in that: The cooling coil layer is provided with a cooling coil inlet and a cooling coil outlet, and the coils of the cooling coil layer are double spiral coils.
4. The cold trap for a vacuum system according to claim 1, wherein: The jacket and the cooling coil layer are provided with valves at the feeding end and the discharging end, the vacuum inlet, the vacuum outlet, the high temperature medium inlet and the waste liquid outlet.
5. The cold trap for a vacuum system according to claim 1, characterized in that: A heat medium generating device is provided on one side of the shell, and a discharge end of the heat medium generating device is connected to a high-temperature medium inlet.
6. The cold trap for a vacuum system according to claim 1, characterized in that: The packing layer is one or a combination of a grid packing layer, a corrugated packing layer, and a pulse packing layer.
7. The cold trap for a vacuum system according to claim 6, characterized in that: The packing layer comprises three layers, which are, from bottom to top, a grid packing layer, a corrugated packing layer and a pulse packing layer.
8. The cold trap for a vacuum system according to claim 1, wherein: The high-temperature medium introduced into the high-temperature medium inlet is steam or hot water.