CN110449273A - A kind of the ventilation mode switching device and circulating ventilation system of centrifuge - Google Patents

Abstract

The invention discloses a ventilation mode switching device and a circulation ventilation system of a centrifuge. The circulation ventilation system of the centrifuge includes a centrifugal cavity provided with a rotor on the centrifuge, a ventilation mode switching device communicated with the centrifugal cavity, and Control circuit, the centrifugal cavity is provided with an air inlet and an air outlet, the upper and lower parts of the centrifugal cavity are respectively equipped with temperature sensors, and the surrounding and bottom of the centrifugal cavity are respectively equipped with a silicone electric heating belt and a silicone electric heating plate. The silicone electric heating belt, the silicone electric heating plate, the temperature sensor, the electric heater, the drainage fan and the damper motor are all electrically connected to the control circuit. The present invention has internal circulation mode, external circulation mode and sterilization combination mode to choose from, which satisfies the needs of customers to the greatest extent, and can also customize the automatic circulation mode according to customer requirements.

Description

Ventilation mode switching device and circulation ventilation system of a centrifuge

technical field

The invention belongs to a centrifuge, in particular to a ventilation mode switching device and a circulating ventilation system of the centrifuge.

Background technique

The centrifuge is an instrument that uses the high-speed rotation of the rotor to speed up the sedimentation speed of the particles in the liquid and separate the substances with different sedimentation coefficients and buoyant densities in the sample. Has been widely used in life sciences, medicine, chemistry, environmental protection and other fields.

Centrifuged samples in different fields have extremely strict requirements on the sample itself and the ambient temperature of the chamber in which it is centrifuged; Bacteria are killed at high temperature in a centrifugal environment. Because the high-speed rotation of the centrifuge rotor drives the gas movement in the cavity, the gas in the cavity is disordered and uneven, and the temperature in the upper, middle and lower areas of the centrifuge cavity is very different, which leads to the centrifugation effect of the sample cannot meet the demand.

The currently adopted schemes are:

1. A heater is installed between the protective sleeve and the inner sleeve of the centrifuge frame, and a heating plate is installed between the bottom of the inner sleeve and the middle partition. This structure can quickly and simply solve the low-speed centrifugal heating requirements of the centrifuge cavity, but As the rotation speed gradually increases, the gas will flow and flow, resulting in an increase in the temperature gradient of the cavity, which cannot meet the requirements of constant temperature and sterilization of the sample environment.

2. Use sliders, slide rails, and screw drives to realize the cyclic switching of the air inlet and outlet of the centrifugal chamber to ensure the internal and external circulation of the centrifugal chamber. This structure can make the temperature of the chamber continuous and balanced, but the structure is complex and sealed. Poor performance, poor heat preservation effect, and limited temperature control range, it is difficult to be widely used.

Contents of the invention

The object of the present invention is to provide a ventilation mode switching device and a circulation ventilation system of a centrifuge that can continuously and constantly realize the internal and external circulation of cold air and hot air and high-temperature sterilization under different rotational speed centrifugation and different sample environmental conditions.

The technical scheme that realizes the object of the present invention is:

The circulating ventilation system of the centrifuge provided by the present invention includes a centrifuge cavity with a rotor inside, a ventilation mode switching device and a control circuit connected with the centrifuge cavity, and the centrifuge cavity is provided with an air inlet and an outlet. The air port, the upper and lower parts of the centrifugal cavity are respectively provided with temperature sensors, and the surrounding and bottom of the centrifugal cavity are respectively equipped with a silicone electric heating belt and a silicone electric heating plate. The air intake channel and the exhaust channel communicated with the air outlet, the switching cavity communicated with the air intake channel and the exhaust channel, the electric heater and the draft fan arranged on the air intake channel, the switch The cavity is provided with a fresh air inlet and an exhaust port, and the switching cavity is provided with a damper motor driven to connect the fresh air inlet with the exhaust port and the air intake channel and the exhaust channel respectively or respectively connect The fresh air inlet is communicated with the air intake channel and the air door is communicated with the exhaust port with the exhaust channel; the silicone electric heating belt, the silicone electric heating plate, the temperature sensor, the electric heater, the drainage fan and the damper The motors are all electrically connected with the control circuit.

The ventilation mode switching device of the centrifuge provided by the present invention includes an air intake channel and an exhaust channel respectively communicated with the air inlet and the air outlet of the centrifugal cavity of the centrifuge, and a switch communicated with the air intake channel and the exhaust channel. The cavity, the electric heater and the drainage fan arranged on the air intake channel, the switching cavity is provided with a fresh air inlet and an exhaust port, and the switching cavity is equipped with a motor driven by the damper to switch the The fresh air inlet is communicated with the exhaust port and the intake passage is communicated with the exhaust passage, or the damper is respectively connected with the fresh air inlet and the intake passage, and the exhaust port is communicated with the exhaust passage. .

The fresh air inlet and outlet are respectively provided with biofilms.

The outer surface of the switching cavity is covered with a thermal insulation layer.

A silica gel pad is provided between the air intake channel and the exhaust channel of the ventilation mode switching device and the air inlet and air outlet of the centrifugal cavity.

Beneficial effect:

1. The present invention can effectively reduce internal heat loss, ensure the personal safety of maintenance personnel and operators, and is easy to maintain. The ventilation mode switching device can adopt a centralized modular design for easy replacement.

2. The present invention has internal circulation mode, external circulation mode and sterilization combination mode to choose from, which can meet the needs of customers to the greatest extent, and can also customize the automatic circulation mode according to customer requirements.

3. The present invention can ensure the rapid temperature rise of the centrifugal cavity, balance the temperature gradient in each area of the cavity, and have the function of sterilization and disinfection at the same time.

The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a perspective view of the ventilation mode switching device in the present invention.

Fig. 3 is a cross-sectional view of the ventilation mode switching device in the present invention.

Fig. 4 is a perspective view of different usage states of the ventilation mode switching device in the present invention.

Fig. 5 is a cross-sectional view of different usage states of the ventilation mode switching device in the present invention.

Detailed ways

See Fig. 1 - Fig. 3, the ventilating system of the centrifuge provided by the present invention, comprises the centrifuge chamber 7 that is provided with rotor 5 on the centrifuge, the ventilation mode switching device 1 that communicates with centrifugal chamber 7 and control circuit 9, The centrifugal chamber 7 is provided with an air inlet 2 and an air outlet 3, the upper and lower parts of the centrifugal chamber 7 are respectively provided with a temperature sensor 6, and the surrounding and bottom of the centrifugal chamber 7 are respectively provided with a silica gel electric heating belt 4 and a silica gel heating belt. The electric heating plate 8; the ventilation mode switching device 1 includes an air intake passage 104 and an exhaust passage 105 communicated with the air inlet 2 and the air outlet 3 of the centrifugal cavity 7 respectively, and the air inlet passage 104 and the air outlet passage 105 communicate with each other. The switching chamber 111 connected by the exhaust passage 105, the PTC electric heater 110 and the drainage fan 102 arranged on the air intake passage 104, the switching chamber 111 is provided with a fresh air inlet 108 and an exhaust outlet 109, The switching cavity 111 is provided with a valve motor 101 to connect the fresh air inlet 108 to the exhaust port 109 and the intake passage 104 to the exhaust passage 105 or to connect the fresh air inlet to the exhaust passage 105 respectively. 108 communicates with the intake channel 104 and the damper 107 communicated with the exhaust port 109 and the exhaust channel 105, the fresh air intake port 108 and the exhaust port 109 are respectively provided with biofilm 112, the ventilation mode Between the inlet channel 104 and the exhaust channel 105 of the switching device 1 and the inlet port 2 and the outlet port 3 of the centrifugal cavity 7, a silica gel backing plate 103 is provided, and the outer surface of the switching cavity 111 is covered with a layer of thermal insulation The heat insulation layer 106 , the silicone electric heating belt 4 , the silicone electric heating plate 8 , the temperature sensor 6 , the PTC electric heater 110 , the drainage fan 102 and the damper motor 101 are all electrically connected to the control circuit 9 .

The present invention can set internal circulation, external circulation, sterilization combination or automatic mode. When working, the temperature sensor 6 in the centrifugal cavity 7 converts the temperature of the upper and lower regions in the centrifugal cavity 7 into electrical signals and transmits them to the control circuit 9 , and then the control circuit 9 outputs the signal source to the ventilation mode switching device 1 to switch to the internal or external circulation mode, and then the control circuit 9 determines whether it is required to start the silica gel electric heating belt 4 and the silica gel electric heating plate 8 to quickly heat the centrifuge chamber The air flow in the body 7 judges whether to start the PTC electric heater 110 according to the given signal. In order to prevent poisonous and harmful bacteria in the cavity from permeating the air, the biofilm 112 acts as a barrier and filter. The electric heating belt 4 and the silicone electric heating plate 8 can work together to realize the rapid temperature rise of the centrifugal cavity 7, and the thermal insulation layer 106 can reduce the heat loss of the shell of the switching cavity 111, avoid accidental touches by personnel during maintenance, cause scalds, burns and other accidents, and play a role of protection and isolation. The temperature in the centrifugal cavity 7 can be detected by the temperature sensor 6.

When the centrifugal cavity 7 airflow external circulation mode is started, as shown in Figure 2 and Figure 3, the control circuit 9 sends instructions to the ventilation mode switching device 1, and the damper motor 101 drives the damper 107 in the switching cavity 111 to intake fresh air The port 108 communicates with the air intake channel 104 and simultaneously connects the exhaust port 109 with the exhaust channel 105, and the drainage fan 2 starts to quickly circulate the ambient air (solid line arrow) into the centrifugal cavity 7, and the air in the centrifugal cavity 7 The gas (dotted arrow) is discharged from the exhaust channel 105 and the exhaust port 109 through the gas outlet 3, so that the centrifugal chamber 7 can quickly drop to the ambient temperature. When starting the airflow internal circulation mode of the centrifugal cavity 7, as shown in Figure 4 and Figure 5, the control circuit 9 sends an instruction to the ventilation mode switching device 1 to start the PTC electric heater 110 in advance and then start the drainage fan 102 after reaching the temperature in the set area , the damper motor 101 drives the damper 107 in the switching cavity 111 to communicate with the atmosphere, the fresh air inlet 108 and the exhaust outlet 109, and at the same time connects the intake passage 104 and the exhaust passage 105, and the airflow (dotted arrow) from the centrifugal The air outlet 3 of the cavity 7 enters the air intake channel 104 directly from the exhaust channel 105 of the drive switching cavity 111, and then is drained by the drainage fan 102, and is preheated by the PTC electric heater 110 from the air intake of the centrifugal cavity 7. Port 2 enters the centrifuge cavity 7, and the constant temperature air flow is continuously circulated to ensure that the temperature gradient of each area in the centrifuge cavity 7 is within the allowable range. Sterilization combination mode is mainly based on the requirements of centrifuged samples, through the control circuit 9 to control the silicone electric heating belt 4 and the silicone electric heating plate 8 to set different sterilization temperatures in the centrifugal cavity 7, and the sterilization temperature setting range is from 80°C to 120°C , causing the cell to lose its activity and die.

Claims (8)

1. a kind of circulating ventilation system of centrifuge, it is characterized in that include on centrifuge in centrifugal chamber casing equipped with rotary head, with from The ventilation mode switching device and control circuit of chambers of the heart body connection, the centrifugal chamber casing are equipped with air inlet and air outlet, centrifugal chamber Intracorporal top and the bottom are respectively equipped with temperature sensor, and around centrifugal chamber casing and bottom is respectively equipped with silica gel heat tape and silica gel Electric heating plate, the ventilation mode switching device include the air inlet being connected to respectively with the air inlet and air outlet of the centrifugal chamber casing Channel and exhaust passage, be connected to the inlet channel and exhaust passage switching cavity, the electricity that is located on the inlet channel Heater and drainage blower, the switching cavity are equipped with fresh air air inlet and exhaust outlet, are equipped in switching cavity by damper motor The fresh air air inlet can be connected to by driving with exhaust outlet respectively and the inlet channel and exhaust passage are connected to or general respectively The air door that the fresh air air inlet is connected to inlet channel and the exhaust outlet is connected to the exhaust passage；The silica gel electricity adds The torrid zone, silica gel electric heating plate, temperature sensor, electric heater, drainage blower and damper motor are electrically connected with control circuit.

2. the circulating ventilation system of centrifuge according to claim 1, it is characterized in that the fresh air air inlet and exhaust outlet On be respectively equipped with biomembrane.

3. the circulating ventilation system of centrifuge according to claim 1 or 2, it is characterized in that the outer surface of the switching cavity Coat one layer of heat preservation thermal insulation layer.

4. the circulating ventilation system of centrifuge according to claim 3, it is characterized in that the ventilation mode switching device Silica gel backing plate is equipped between inlet channel and the air inlet and air outlet of exhaust passage and centrifugal chamber casing.

5. a kind of ventilation mode switching device of centrifuge, it is characterized in that include respectively with the air inlet of centrifuge centrifugal chamber casing and The inlet channel and exhaust passage of gas outlet connection, are located at institute at the switching cavity being connected to the inlet channel and exhaust passage The electric heater and drainage blower, the switching cavity stated on inlet channel are equipped with fresh air air inlet and exhaust outlet, the switching Being equipped in cavity can be respectively connected to the fresh air air inlet with exhaust outlet and the inlet channel and row by damper motor driving Gas channel connection or respectively by the fresh air air inlet be connected to inlet channel and the exhaust outlet and the exhaust passage company Logical air door.

6. the ventilation mode switching device of centrifuge according to claim 5, it is characterized in that the fresh air air inlet and row Biomembrane is respectively equipped on port.

7. the ventilation mode switching device of centrifuge according to claim 5 or 6, it is characterized in that the switching cavity is outer Surface coats one layer of heat preservation thermal insulation layer.

8. the ventilation mode switching device of centrifuge according to claim 7, it is characterized in that the inlet channel and exhaust Silica gel backing plate is equipped between channel and the air inlet and air outlet of centrifugal chamber casing.