Negative pressure isolator

Abstract

The utility model provides a negative pressure isolator which comprises an operation cavity assembly and is characterized in that a static pressure box is arranged at the top of the operation cavity assembly, a fresh air inlet is formed in the static pressure box, and a fresh air pipeline, an exhaust pipeline and an air inlet pipeline connected with the fresh air pipeline are arranged in the static pressure box. The fresh air pipeline is provided with a first butterfly valve and a fresh air filter pipeline, the exhaust pipeline is provided with an exhaust fan, a second butterfly valve and an exhaust filter pipeline, and the top of the fresh air filter pipeline and the top of the exhaust filter pipeline are each provided with a gland assembly. A new filter is pressed into the filter pipeline through the pressing rod assembly, meanwhile, a replaced filter is pressed out, the sealing ring is arranged at the connecting position of the filter and the filter pipeline so that toxic substances can be prevented from leaking, and the replaced filter is put into a bag and conveyed out of the negative pressure isolator through the bag outlet barrel. The whole replacement process does not pollute personnel and environment, and the filter can be quickly replaced.

Description

Technical Field

[0001] The utility model relates to the field of purification equipment, in particular to a negative pressure isolator. Background Art

[0002] The negative pressure isolation system is an air purification product that isolates operators from toxic raw materials through physical barriers. The one-way air flow in the device is filtered to isolate the operator and the test sample. The contaminated air in the device is filtered by a high-efficiency air filter and discharged into the exhaust duct, which can completely isolate the operator, the environment and the test sample to prevent cross contamination. The existing negative pressure isolators are relatively troublesome to replace the high-efficiency filters, and the replacement efficiency is low. There is a certain risk of leakage during replacement, which leads to the spillage of toxic and harmful substances. It cannot be isolated from personnel and the environment, which is easy to cause cross contamination. Utility Model Content

[0003] In order to solve the above difficulties, the utility model provides a negative pressure isolator. The utility model provides the following technical solutions:

[0004] A negative pressure isolator comprises an operating chamber assembly, a static pressure box is arranged on the top of the operating chamber assembly, a fresh air inlet is opened in the static pressure box, a fresh air duct, an exhaust duct and an air inlet duct connected to the fresh air duct are arranged in the static pressure box, the fresh air duct, the exhaust duct and the air inlet duct are all connected to the operating chamber assembly; a first butterfly valve and a fresh air filter duct equipped with a fresh air filter are arranged on the fresh air duct, an exhaust fan, a second butterfly valve and an exhaust filter duct equipped with a first exhaust filter and a second exhaust filter are arranged on the exhaust duct, a pressure cover assembly is arranged on the top of the fresh air filter duct and the exhaust filter duct, and a detachable tray is arranged on the bottom of the fresh air filter duct and the exhaust filter duct.

[0005] Preferably, the operating chamber assembly includes an operating chamber connected to the fresh air filter duct and the exhaust air filter duct, and the operating chamber is provided with a visual door and a bag outlet door, the visual door is provided with a plurality of through holes for connecting operating gloves, the bag outlet door is connected to a bag outlet barrel, and the bag outlet barrel is arranged outside the operating chamber, and a plurality of annular grooves are provided on the outer periphery of the bag outlet barrel.

[0006] Preferably, a sealing ring is provided at the connection between the fresh air filter and the fresh air filter duct; and sealing rings are provided at the connections between the first exhaust air filter and the second exhaust air filter and the exhaust air filter duct.

[0007] Preferably, the gland assembly includes a gland and a gland rod, and the gland rod is arranged below the gland and connected to the gland.

[0008] Preferably, the two trays are respectively mounted on the bottom of the air inlet filter duct and the exhaust filter duct, the tray is provided with an L-shaped hole, the air inlet filter duct and the exhaust filter duct are both provided with protrusions for clamping the L-shaped holes, and the bottom of the tray and the top of the pressure cover are both provided with handles.

[0009] Preferably, an air inlet is provided between the first butterfly valve and the fresh air filter pipe, and the air inlet is connected to the air inlet pipeline.

[0010] Preferably, a differential pressure gauge and a temperature and humidity detection probe are provided in the operating cabin.

[0011] Preferably, the top of the operating cavity is provided with several lighting lamps and alarm lamps.

[0012] The beneficial effects of the utility model are as follows: the utility model utilizes a pressure rod assembly, and when replacing the filter, a new filter is pressed into the filter pipe, and the replaced filter is pressed out at the same time. A sealing ring is provided at the connection between the filter and the filter pipe, which can prevent leakage of toxic substances. The old filter falls into the operating cavity, and the replaced filter is put into a bag and transported out of the negative pressure isolator by utilizing a bag-out barrel. The entire replacement process will not pollute personnel and the environment, and the filter can be quickly replaced. The use is simpler and safer, and personnel contact and cross contamination can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a structural schematic diagram of the utility model;

[0015] Figure 3 It is a partial structural schematic diagram of the utility model;

[0016] Figure 4 It is a partial structural schematic diagram of the utility model;

[0017] Figure 5 This is a schematic diagram of the structure of the fresh air filter duct in the utility model;

[0018] Figure 6 yes Figure 5 Schematic diagram of the cross-section result in the middle BB direction;

[0019] Figure 7 It is a structural schematic diagram of the exhaust filter duct in the utility model;

[0020] Figure 8 yes Figure 7 Schematic diagram of the cross-section result in the CC direction;

[0021] Among them: operation chamber assembly 1, operation chamber body 2, visual door 3, through hole 4, bag outlet door 5, bag outlet 6, groove 61, static pressure box 7, fresh air inlet 8, fresh air pipeline 9, first butterfly valve 91, fresh air filter pipeline 92, fresh air filter 93, exhaust pipeline 10, exhaust fan 101, second butterfly valve 102, exhaust filter pipeline 103, first exhaust filter 104, second exhaust filter 105, exhaust outlet 12, pressure cover assembly 13, pressure cover 131, pressure rod 132, tray 14, L-shaped hole 141, protrusion 15, air inlet 16, differential pressure gauge 17, temperature and humidity detection probe 18, lighting 19, alarm light 20, handle 21. DETAILED DESCRIPTION

[0022] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0023] In the description of the present invention, it should be noted that the terms "upper" and "lower" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] like Figures 1 to 8 As shown, the utility model provides a negative pressure isolator, which includes an operating chamber assembly 1, the operating chamber assembly 1 includes an operating chamber body 2, a visual door 3 is arranged on the operating chamber 2, the visual door 3 is made of tempered glass for easy observation of the operating chamber 2, and a plurality of through holes 4 for connecting operating gloves (not shown) are opened on the visual door 3, the operating gloves are sealed and connected to the through holes 4, and when in use, the operator can put his hand deep into the operating gloves and perform the operation of replacing the filter in the operating chamber 2. A bag outlet door 5 is provided on one side of the operating chamber 2. The bag outlet door 5 is connected to the bag outlet barrel 6. The bag outlet barrel 6 is arranged outside the operating chamber 2. A plurality of annular grooves 61 for clamping a sealing ring (not shown) are provided on the outer circumference of the bag outlet barrel 6. When in use, a bag (not shown) is put on the bag outlet barrel 6, and the bag is fixed on the bag outlet barrel 6 by using the sealing ring. The sealing ring is clamped at the groove 61 to seal the bag and the bag outlet barrel 6 to prevent leakage of toxic and harmful substances. The bag outlet door 5 is opened, and the replaced old filter is transported into the bag through the bag outlet door 5.

[0025] Furthermore, a static pressure box 7 is provided at the top of the operating chamber assembly 1. The static pressure box 7 is provided with a fresh air inlet 8 and an exhaust air outlet 12. A fresh air duct 9, an exhaust air duct 10, and an air inlet duct connected to the fresh air duct 9 (not shown) are provided in the static pressure box 7.

[0026] The fresh air duct 9 is connected to the fresh air through the fresh air inlet 8. The fresh air duct 9 is provided with a first butterfly valve 91 and a fresh air filter duct 92. The fresh air filter duct 92 is provided with a fresh air filter 93 inside. A sealing ring (not shown) is provided at the connection between the fresh air filter 93 and the fresh air filter duct 92. The exhaust duct 10 is provided with an exhaust fan 101, a second butterfly valve 102 and an exhaust filter duct 103. The exhaust filter duct 103 is provided with a first exhaust filter 104 and a second exhaust filter 105. A sealing ring (not shown) is provided between the first exhaust filter 104 and the second exhaust filter 105 and the exhaust filter duct 103.

[0027] The fresh air filter duct 92 and the exhaust air filter duct 103 are both connected to the operating chamber 2 so that the fresh air duct 9, the exhaust air duct 10 and the air inlet duct are connected to the operating chamber 2. A gland assembly 13 is provided at the top of the fresh air filter duct 92 and the exhaust air filter duct 103 for replacing the filter. The gland assembly 13 includes a gland 131 and a pressure rod 132 arranged below the gland 131 and connected to the gland 131. A detachable tray 14 is provided at the bottom of the fresh air filter duct 92 and the exhaust air filter duct 103, and the two trays are respectively sleeved on the bottom of the air inlet filter duct 92 and the exhaust air filter duct 103. The tray 14 is provided with an L-shaped hole 141, and a protrusion 15 is provided on the air inlet filter duct 92 and the exhaust air filter duct 103. The protrusion 15 is clamped on the L-shaped hole 141 to fix the tray 14, or the tray 14 is rotated to make the protrusion 15 leave the L-shaped hole to remove the tray 14. The top of the gland and the bottom of the tray are both provided with handles 21. When replacing the fresh air filter 93, open the gland assembly 13, put the new fresh air filter 93 into the fresh air filter duct 92, press the gland assembly 13 downward, press the old fresh air filter 93 out, and make it fall into the operating chamber 2. When replacing the exhaust filter, open the gland assembly 13, put the new first exhaust filter 104 and the second exhaust filter 105 into the exhaust filter duct 103 in turn, and use the gland assembly 13 to press downward to press the old first exhaust filter 104 and the second exhaust filter 105 out, and make them fall into the operating chamber 2.

[0028] Furthermore, an air inlet 16 is provided between the first butterfly valve 91 and the fresh air filter pipe 92 , and the air inlet 16 is connected to the air inlet pipeline for introducing compressed gas through the air inlet pipeline and the air inlet 16 .

[0029] The utility model also includes a differential pressure gauge 17 connected to the operating cavity 2 and used to measure the pressure difference in the operating cavity 2 and a temperature and humidity detection probe 18 for measuring the temperature and humidity inside the operating cavity 2. A plurality of lighting lamps 19 and an alarm lamp 20 are arranged on the top of the operating cavity 2.

[0030] When the utility model is used, it includes several stages:

[0031] Close test stage: Close the visible door 3 of the operating chamber 2, and the compressed air passes through the air inlet pipe and the air inlet 16, and enters the operating chamber 2 through the fresh air filter 93. Stop injecting compressed air after the operating chamber 2 reaches a certain pressure. After stopping the injection, observe the pressure change in the operating chamber 2 for a period of time. If it meets the test requirements, the working self-cleaning mode can be turned on.

[0032] Self-cleaning stage: the first butterfly valve 91 is opened, the second butterfly valve 102 is opened, the exhaust fan 101 is opened, and the fresh air enters the fresh air filter pipe 92 from the fresh air inlet 8, and enters the operating chamber 2 through the fresh air filter 93 (the fresh air filter 93 can be an H14 high efficiency filter). The airflow in the operating chamber 2 passes through the exhaust filter pipe 103, passes through the second exhaust filter 105 and the first exhaust filter 104 (the first exhaust filter 104 and the second exhaust filter 105 can be H14 high efficiency filters), and is discharged from the operating chamber 2 through the exhaust fan 101. After 120s, the self-cleaning stage is terminated, and the system is turned on to enter the working mode.

[0033] Working stage: the first butterfly valve 91 is opened, the second butterfly valve 102 is opened, and the exhaust fan 101 is opened, which is consistent with the self-cleaning state, and a certain pressure is maintained in the operation chamber 2, and the operator can start to operate. When the working stage ends, the first butterfly valve 91 is closed, the second butterfly valve 102 is closed, and the exhaust fan 101 is closed, and the working state ends.

[0034] Filter replacement stage: The visual door 3 of the operating chamber 2 is tightly closed. The new fresh air filter 93 is placed into the fresh air filter duct 92 through the static pressure box 7. The new fresh air filter 93 is pressed into the fresh air filter duct 92 by the gland assembly 13, and the old fresh air filter 93 to be replaced is pressed out of the fresh air filter duct 92 and dropped into the operating chamber 2. The replaced fresh air filter 93 is packaged and sealed, and then taken out of the operating chamber 2 through the bag outlet 6.

[0035] Put the new first exhaust filter 104 and the second exhaust filter 105 into the exhaust filter duct 103 through the static pressure box 7. Use the cover assembly 13 to press the new second exhaust filter 105 and the first exhaust filter 104 into the exhaust filter duct 103 in sequence, and press the first exhaust filter 104 and the second exhaust filter 105 to be replaced out of the exhaust filter duct 103 and drop them into the operating chamber 2. After the replaced first exhaust filter 104 and the second exhaust filter 105 are packed and sealed, they are taken out of the operating chamber 2 through the bag outlet 6.

[0036] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A negative pressure isolator, comprising an operating chamber assembly, characterized in that: A static pressure box is provided on the top of the operating chamber assembly, and a fresh air inlet is opened in the static pressure box. A fresh air duct, an exhaust duct and an air inlet duct connected to the fresh air duct are provided in the static pressure box, and the fresh air duct, the exhaust duct and the air inlet duct are all connected to the operating chamber assembly; a first butterfly valve and a fresh air filter duct equipped with a fresh air filter are provided on the fresh air duct, and an exhaust fan, a second butterfly valve and an exhaust filter duct equipped with a first exhaust filter and a second exhaust filter are provided on the exhaust duct, and a pressure cover assembly is provided on the top of the fresh air filter duct and the exhaust filter duct, and a detachable tray is provided on the bottom of the fresh air filter duct and the exhaust filter duct.

2. The negative pressure isolator according to claim 1, characterized in that: The operating chamber assembly includes an operating chamber connected to the fresh air filter duct and the exhaust air filter duct, the operating chamber is provided with a visual door and a bag outlet door, the visual door is provided with a plurality of through holes for connecting operating gloves, the bag outlet door is connected with a bag outlet barrel, the bag outlet barrel is arranged outside the operating chamber, and a plurality of annular grooves are provided on the outer periphery of the bag outlet barrel.

3. The negative pressure isolator according to claim 2, characterized in that: A sealing ring is provided at the connection between the fresh air filter and the fresh air filter duct; and a sealing ring is provided at the connection between the first exhaust air filter and the second exhaust air filter and the exhaust air filter duct.

4. The negative pressure isolator according to claim 1, characterized in that: The gland assembly includes a gland and a gland, wherein the gland is arranged below the gland and connected to the gland.

5. The negative pressure isolator according to claim 4, characterized in that: The two trays are respectively mounted on the bottom of the fresh air filter duct and the exhaust air filter duct, and the tray is provided with an L-shaped hole. The fresh air filter duct and the exhaust air filter duct are both provided with protrusions for clamping the L-shaped holes, and the bottom of the tray and the top of the pressure cover are both provided with handles.

6. The negative pressure isolator according to claim 1, characterized in that: An air inlet is provided between the first butterfly valve and the fresh air filter pipe, and the air inlet is connected to the air inlet pipeline.

7. The negative pressure isolator according to claim 2, characterized in that: A differential pressure gauge and a temperature and humidity detection probe are arranged in the operating cavity.

8. The negative pressure isolator according to claim 7, characterized in that: A plurality of lighting lamps and warning lamps are arranged on the top of the operating cavity.

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