CN203286696U - Laminar flow cover - Google Patents

Abstract

The utility model provides a laminar flow cover, which includes a cover body, an FFU and a filter installed in the cover body, the air inlet end of the cover body is fixedly connected with an air inlet flange, and the other end of the air inlet flange is connected to the The air supply pipe is connected, and the cover body directly takes air from the air supply pipe through the air inlet flange, thereby avoiding the turbulent flow and turbulent flow caused by the side air intake method in the prior art to the surrounding Class B environment. A differential pressure gauge is installed on the upper part of the side wall of the cover to detect the pressure difference between the cavity above the FFU in the cover and the B-level environment outside the cover through the differential pressure gauge, making the pressure difference a negative pressure to prevent gas leakage in the cover into the B-level environment around the enclosure and affect the performance of the B-level environment.

Description

a laminar flow hood

technical field

The utility model relates to an air filtering device, in particular to a laminar flow cover. the

Background technique

With the implementation of the new version of GMP, pharmaceutical companies that produce terminally sterilized products generally use sterile isolation devices to protect the entire process. At present, the common isolation system generally adopts the side air intake method, which is likely to cause turbulence or turbulence to the surrounding B-level environment near the air inlet, and then affect the surrounding environment. Here it is the weak point that existing technology exists. the

Contents of the invention

The technical problem to be solved by the utility model is to provide a laminar flow hood that will not affect the stability of the surrounding B-level environment in view of the deficiencies in the prior art. the

This solution is realized through the following technical measures: the laminar flow hood includes a cover body and an FFU and a filter installed in the cover body, the air inlet end of the cover body is fixedly connected with an air inlet flange, and the air inlet flange The other end is connected to the air supply pipe; a differential pressure gauge is installed on the upper part of the side wall of the cover body, and the pressure difference between the cavity above the FFU in the cover body and the B-level environment outside the cover body is detected by the differential pressure gauge, and the pressure difference is negative pressure. the

The upper part of the side wall of the cover is also equipped with an alarm. When the pressure difference between the cavity above the FFU in the cover and the B-level environment outside the cover is not negative pressure, the alarm will start an alarm, so that the inside of the cover is always in a negative pressure state. To prevent the gas above the FFU from leaking into the Class B environment. the

The above-mentioned filter is installed on the lower part of the cover body through the support frame, and the upper part of the support frame is provided with a positioning block that cooperates with the FFU, and the FFU is positioned by the positioning block to prevent its movement. the

In order to achieve a better positioning effect, the cross-section of the positioning block is L-shaped. the

The joint between the air inlet flange and the cover is sealed with a gasket, and the joint between the air inlet flange and the air supply pipe is sealed with a gasket to prevent gas leakage due to poor sealing, and to protect the B around the cover. impact on the environment. the

The above-mentioned filter adopts a liquid tank sealing structure to ensure good sealing performance of the filter. the

The beneficial effect of this scheme can be known from the description of the above scheme. In this laminar flow hood, the air inlet end of the cover body is fixedly connected with an air inlet flange, and the cover body directly takes air from the air supply pipe through the air inlet flange. , thereby avoiding the turbulent flow and turbulent flow caused by the side air intake method in the prior art to the surrounding Class B environment. The upper part of the side wall of the cover is equipped with a differential pressure gauge, which is used to detect whether the pressure difference between the cavity above the FFU in the cover and the B-level environment outside the cover is negative pressure, so as to prevent the gas in the cover from leaking into the cover Affects the performance of the B-level environment in the surrounding B-level environment. It can be seen that, compared with the prior art, the utility model has substantive features and progress, and the beneficial effects of its implementation are also obvious. the

Description of drawings

Fig. 1 is a schematic structural view of a specific embodiment of the present invention. the

Fig. 2 is a schematic diagram of the cross-sectional structure of A-A in Fig. 1 . the

In the figure, 1 is the alarm, 2 is the differential pressure gauge, 3 is the gasket, 4 is the air inlet flange, 5 is the cover body, 6 is the FFU, 7 is the filter, 8 is the support frame, and 9 is the positioning block . the

Detailed ways

In order to clearly illustrate the technical characteristics of this solution, the following will describe this solution through specific implementation modes and in conjunction with the accompanying drawings. the

A laminar flow hood, as shown in Figure 1 and Figure 2, it includes a cover body 5, an FFU6 installed in the cover body 5 and a filter 7, the filter 7 adopts a liquid tank sealing structure, and the filter 7 is supported by The frame 8 is installed on the lower part of the cover body 5, and the upper part of the support frame 8 is provided with a positioning stopper 9 that cooperates with the FFU6, and the cross section of the positioning stopper 9 is L-shaped. The air inlet end of the cover body 5 is fixedly connected with the air inlet flange 4, the other end of the air inlet flange 4 is connected with the air supply pipe, the joint between the air inlet flange 4 and the cover body 5 and the air inlet flange 4 The butt joints with the air supply pipe are all sealed with gasket 3. The upper part of the side wall of the cover body 5 is provided with a differential pressure gauge 2 and a buzzer alarm 1, and the differential pressure gauge 2 is used to detect the pressure difference between the cavity above the FFU6 in the cover body 5 and the B-level environment outside the cover body 5, so that the pressure The difference is maintained as a negative pressure, and when the pressure difference between the cavity above the FFU6 in the cover 5 and the B-level environment outside the cover 5 is not negative, the alarm 1 starts an alarm. the

When performing air filtration, the air is directly conveyed into the cover body 5 through the air supply pipe, which avoids the turbulence and turbulence caused by directly taking the wind from the surrounding B-level environment to the B-level environment, and ensures the quality of medicines. the

The pressure difference between the cover body 5 and the surrounding environment is monitored at all times by the differential pressure gauge 2, so that the cover body 5 is always in a negative pressure environment, so as to facilitate the air supply pipe to supply air to the cover body 5, and at the same time ensure that the inside of the cover body 5 The gas will not leak into the B-level environment and affect the performance of the B-level environment. If the pressure difference inside and outside the cover body 5 is less than the set value, the differential pressure gauge 2 will feed back the corresponding signal to the control system, and the control system will control the damper at this place to be closed. the

The technical features not described in the utility model can be realized by the prior art, and will not be repeated here. the

Claims (7)

1. laminar flow hood, it comprises cover body and is installed on FFU and filter in cover body, it is characterized in that: the air inlet end of described cover body is fixedly connected with air inlet flange, and the other end of air inlet flange is connected with ajutage; Faceshield side wall top is provided with differential manometer, by differential manometer, detects pressure reduction between the top of FFU in cover body cavity and cover body outside B level environment, and this pressure reduction is negative pressure.

2. laminar flow hood according to claim 1, it is characterized in that: described faceshield side wall top also is provided with alarm.

3. laminar flow hood according to claim 1 and 2, it is characterized in that: described filter is arranged on the cover body bottom by bracing frame, and bracing frame top is provided with the position block that coordinates with FFU.

4. laminar flow hood according to claim 3, it is characterized in that: the cross section of described position block is L shaped.

5. laminar flow hood according to claim 1 and 2, is characterized in that: the joint employing sealing gasket sealing of described air inlet flange and cover body.

6. laminar flow hood according to claim 5, is characterized in that: the joint employing sealing gasket sealing of described air inlet flange and ajutage.

7. laminar flow hood according to claim 1 and 2, is characterized in that: described filter employing liquid tank sealing structure.

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