CN217040809U - Pressure steam sterilizer - Google Patents

Abstract

The application discloses a pressure steam sterilizer, which comprises a sterilizer inner chamber and a vacuumizing device; the sterilizer inner chamber is connected with a vacuum-pumping device through a sterilizing filter, and a heating sleeve is arranged on the periphery of the sterilizing filter. This pressure steam sterilizer sets up the heating jacket in bacteria removing filter's periphery, and the heating jacket can improve bacteria removing filter's temperature, reduces the difference in temperature that steam flowed through bacteria removing filter, avoids steam to condense and attach to the filter core, and then avoids bacteria removing filter's front and back pressure differential too big, in other words, is favorable to improving bacteria removing filter's permeability to guarantee this pressure steam sterilizer's the efficiency of managing to find time, shorten the operation cycle.

Description

Pressure steam sterilizer

Technical Field

The application relates to the field of biological sterilization, in particular to a pressure steam sterilizer.

Background

Biosafety pressure steam sterilizers are typically provided with an exhaust filter to intercept pathogenic microorganisms.

When the biosafety type pressure steam sterilizer is used, on one hand, when steam flows through the exhaust filter element, steam condensate water is easy to generate and is attached to the surface and the inside of the exhaust filter element, so that the ventilation quantity of the exhaust filter element is greatly reduced, and the problems of damage and short service life of the exhaust filter element, large prolongation of the pulsation phase time of the biosafety type pressure steam sterilizer, incapability of exhausting or large reduction of the exhaust rate and the like are caused. Once the exhaust cartridge is damaged, there is a risk of leakage of pathogenic microorganisms.

In summary, how to improve the operation efficiency and the operation safety of the biosafety pressure steam sterilizer is a problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pressure steam sterilizer can maintain the operating condition of the high-efficient filtration degerming of filter core for a long time, reduces the damage probability of filter core.

In order to achieve the above object, the present application provides a pressure steam sterilizer, comprising a sterilizer inner chamber and a vacuum-pumping device; the sterilizer inner chamber is connected with a vacuum-pumping device through a sterilizing filter, and a heating sleeve is arranged on the periphery of the sterilizing filter.

Preferably, the sterilizing filter comprises a first sterilizing filter and a second sterilizing filter in series; the heating jacket includes the filter heating jacket that encloses the periphery of locating first degerming filter and second degerming filter respectively.

Preferably, a filter connecting pipe is connected in series between the first sterilizing filter and the second sterilizing filter; the heating jacket also comprises a pipe heating jacket which is arranged around the periphery of the filter connecting pipe.

Preferably, the sterilizer inner chamber comprises a first inner chamber port and a second inner chamber port; the first inner chamber port is connected with the sterilizing filter, the second inner chamber port is provided with a sixth pipeline used for connecting steam supply equipment, and the sixth pipeline is provided with a sixth pipeline valve and a steam-water separator; the pipe heating sleeve is provided with a second pipeline used for connecting the steam supply equipment and a second pipeline valve arranged on the second pipeline.

Preferably, the second inner chamber port is connected to a vacuum pumping device through a seventh pipe and a seventh pipe valve provided in the seventh pipe.

Preferably, the tube heating jacket comprises an inlet and an outlet; the inlet is communicated with the second pipeline, and the outlet is communicated with the vacuumizing equipment through a third pipeline; the third pipeline is provided with a drain valve.

Preferably, a fourth pipeline and a fourth pipeline valve arranged on the fourth pipeline are arranged between the second sterilizing filter and the vacuum-pumping device; the outlet end of the third pipeline is connected to the fourth pipeline and is positioned at the downstream of the fourth pipeline valve.

Preferably, the filter heating jacket is an electrical heating jacket or a steam heating jacket.

Preferably, the evacuation device comprises an atmospheric ejector and a water ring vacuum pump.

Preferably, the sterilizer outer chamber is arranged on the periphery of the sterilizer inner chamber; the outer chamber opening of the sterilizer outer chamber is provided with a first pipeline used for connecting steam supply equipment and a first pipeline valve arranged on the first pipeline.

Against the above background, the present application provides a pressure steam sterilizer comprising a sterilizer inner chamber and a vacuum-pumping device; the sterilizer inner chamber is connected with a vacuum-pumping device through a sterilizing filter, and a heating sleeve is arranged on the periphery of the sterilizing filter.

Among the above-mentioned pressure steam sterilizer, sterilizing filter's periphery is equipped with the heating jacket, and heatable and heat preservation sterilizing filter and inside filter core thereof avoid steam to condense in sterilizing filter and filter core when flowing through sterilizing filter on the one hand, and on the other hand also can make the steam condensate water that has condensed vaporize fast. It can be seen that this pressure steam sterilizer can avoid the attached filter core of bacteria removing filter of steam condensate water effectively to improve the permeability of bacteria removing filter and filter core, reduced bacteria removing filter's front and back pressure differential, improved the efficiency of managing to find time of this pressure steam sterilizer, thereby shorten this pressure steam sterilizer's duty cycle.

In addition, because the steam condensate is not easy to adhere to the sterilizing filter and the filter element thereof, the probability of damage of the sterilizing filter and the filter element thereof caused by the steam condensate is greatly reduced, and the problem of biological safety of the pressure steam sterilizer in the sterilizing operation due to the fault of the sterilizing filter can be avoided.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a pressure steam sterilizer provided in an embodiment of the present application.

The sterilization device comprises a sterilizer inner chamber 1, a sterilizer inner chamber 11, a sterilizer inner chamber port 12, a sterilizer inner chamber 2, a sterilizer outer chamber 21, a sterilizer outer chamber port 30, a filter connecting pipe 31, a sterilizer inner chamber port 32, a sterilizer inner chamber port 4, a sterilizer outer chamber port 5, a sterilizer outer chamber port 50, a sterilizer connecting pipe 30, a sterilizer inner chamber port 31, a sterilizer inner chamber port 32, a sterilizer inner chamber port 4, a sterilizer outer chamber port 5, a sterilizer inner chamber port 52, a sterilizer outer chamber port 52, a sterilizer inner chamber port 61, a sterilizer inner chamber 4, a sterilizer inner chamber 7, a sterilizer inner chamber 8, a sterilizer inner chamber 9, a sterilizer inner chamber port 10, a sterilizer inner chamber 4, a sterilizer inner chamber, a sterilizer outer chamber, a sterilizer inner chamber, a sterilizer outer chamber, a sterilizer inner chamber, a sterilizer outer chamber, a sterilizer inner chamber, a sterilizer outer chamber, a sterilizer inner chamber, a sterilizer outer chamber, a sterilizer inner chamber, a sterilizer outer chamber, a sterilizer inner chamber, a sterilizer inner chamber, a sterilizer inner chamber.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

In order to better understand the technical scheme of the present application, the following detailed description is provided for the person skilled in the art with reference to the accompanying drawings and the detailed description.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a pressure steam sterilizer provided in an embodiment of the present application.

The application provides a pressure steam sterilizer, which comprises a sterilizer inner chamber 1 and vacuumizing equipment; wherein, the sterilizer inner chamber 1 is connected to a vacuum-pumping device through a sterilizing filter, and a heating jacket is provided around the outer circumference of the sterilizing filter.

When the pressure steam sterilizer is used, the object to be sterilized with toxic pathogens is placed in the sterilizer inner chamber 1, and the steam in the sterilizer inner chamber 1 can sterilize the object to be sterilized; after the sterilization is finished, the vacuumizing equipment discharges the steam in the sterilizer inner chamber 1, and at the moment, the sterilizing filter can effectively filter out harmful substances such as viruses in the steam.

The basic operation principle and steps of the pressure steam sterilizer are briefly described above, and in actual operation, before steam is introduced into the sterilizer inner chamber 1 or before articles to be sterilized are placed in the sterilizer inner chamber 1, original air containing non-condensable gas in the sterilizer inner chamber 1 is evacuated by using evacuation equipment; the pulse circulation of the steam in the sterilizer inner chamber 1 is also realized by the repeated alternation of the steam supply start-stop state of the sterilizer inner chamber 1 and the start-stop state of the vacuum pumping equipment. The specific operation can refer to the specific operation mode aiming at the products in the prior art.

The repeated alternation of the steam supply start-stop state of the sterilizer inner chamber 1 and the start-stop state of the vacuum pumping equipment generally means that the vacuum pumping equipment is closed when steam is supplied to the sterilizer inner chamber 1, and the vacuum pumping equipment is opened when the steam is stopped being supplied to the sterilizer inner chamber 1.

Compare in current like product, the pressure steam sterilizer that this application provided sets up the heating jacket in bacteria removing filter's periphery, and the bacteria removing filter is established to the heating jacket encirclement. When opening the heating jacket, the heating jacket can improve the temperature on the surface of bacteria removing filter especially bacteria removing filter, condenses in bacteria removing filter when avoiding steam to flow through bacteria removing filter, leads to bacteria removing filter's filter core to adhere to steam condensate water.

The heating principle of the heating jacket is not unique, and the heating jacket can be set according to specific working conditions, including and not limited to electric heating or steam heating.

To sum up, the pressure steam sterilizer that this application provided can avoid steam condensate to adhere to sterilization filter, has reduced sterilization filter's front and back pressure differential, has also reduced the damage probability of sterilization filter and filter core, is favorable to improving sterilization filter's permeability, improves evacuating efficiency of pressure steam sterilizer, shortens pressure steam sterilizer's operation cycle.

The pressure steam sterilizer provided by the present application will be further described with reference to the accompanying drawings and embodiments.

In order to exert a better sterilizing and filtering effect, the sterilizing filter of the pressure steam sterilizer provided by the present application may include a first sterilizing filter 31 and a second sterilizing filter 32 connected in series, for example, an inlet end of the first sterilizing filter 31 is connected to the sterilizer inner chamber 1, an outlet end of the first sterilizing filter 31 is connected to an inlet end of the second sterilizing filter 32, and an outlet end of the second sterilizing filter 32 is connected to the vacuum-pumping device. The aforesaid first sterilizing filter 31 and the second sterilizing filter 32 are both provided with a filter heating jacket 4 at their peripheries for heating and keeping warm the first sterilizing filter 31 and the second sterilizing filter 32, respectively, in other words, the heating jacket of the pressure steam sterilizer comprises at least two filter heating jackets 4 for enclosing the first sterilizing filter 31 and the second sterilizing filter 32, respectively.

When the steam in the sterilizer inner chamber 1 flows to the vacuum-pumping equipment, the first sterilizing filter 31 and the second sterilizing filter 32 which are connected in series are adopted to filter and sterilize the steam, so that the reliability of filtering and sterilizing is improved, or the pathogenic microorganisms in the steam are prevented from leaking to the outside through the vacuum-pumping equipment. Of course, the first sterilizing filter 31 and the second sterilizing filter 32 connected in series do not increase the front-back pressure difference of the sterilizing filters compared with a single sterilizing filter, but because the first sterilizing filter 31 and the second sterilizing filter 32 are both provided with the filter heating sleeve 4, the filter elements of the first sterilizing filter 31 and the second sterilizing filter 32 are not easy to attach steam condensate, and therefore the reliability of the filtration sterilization and the operating efficiency of the filtration sterilization are well balanced by the pressure steam sterilizer.

As described above, the heating principle of the heating jacket may be electric heating or steam heating, and thus the filter heating jacket 4 may be an electric heating jacket or a steam heating jacket.

Further, in the case of the first sterilizing filter 31 and the second sterilizing filter 32 connected in series, the filter connecting pipe 30 is often provided therebetween, that is, the first sterilizing filter 31, the filter connecting pipe 30 and the second sterilizing filter 32 are connected in series. Correspondingly, this pressure steam sterilizer's heating jacket is still including enclosing pipe heating jacket 5 of locating filter connecting pipe 30 periphery, and pipe heating jacket 5 parcel filter connecting pipe 30 for heating and heat preservation filter connecting pipe 30 avoids steam to form the steam condensate water in filter connecting pipe 30.

Since the filter connecting tube 30 is formed in a tubular shape and the tube heating jacket 5 is provided around the outer circumference of the filter connecting tube 30, the filter connecting tube 30 and the tube heating jacket 5 may be formed in a double-layered tube.

As described above, when sterilizing an item to be sterilized placed in the sterilizer chamber 1 with steam, the pressure steam sterilizer generally circulates the steam in the sterilizer chamber 1 in a pulsating manner, and in order to provide a suitable pulsating pressure in the sterilizer chamber 1, the sterilizer chamber 1 may be connected to a steam supply device so as to supply the sterilizer chamber 1 with steam using the steam supply device.

For example, the sterilizer internal chamber 1 can include a first internal chamber port 11 and a second internal chamber port 12; the first inner chamber port 11 is connected with a sterilizing filter, the second inner chamber port 12 is provided with a sixth pipeline 66 used for connecting a steam supply device, and the sixth pipeline 66 is provided with a sixth pipeline valve and a steam-water separator 7; meanwhile, the pipe heating jacket 5 is provided with a second pipe 62 for connecting a steam supply device and a second pipe valve provided to the second pipe 62.

Based on the structure, the repeated alternation of the steam supply start-stop state of the sterilizer inner chamber 1 and the start-stop state of the vacuum pumping equipment specifically means that the vacuum pumping equipment is closed when the second inner chamber port 12 of the sterilizer inner chamber 1 is communicated with the steam supply equipment; the vacuum device is switched on when the second chamber opening 12 of the sterilizer chamber 1 is shut off from the steam supply device. Obviously, when the second inner chamber port 12 is connected to the steam supply device and the vacuum pumping device is closed, the steam supply device feeds steam into the sterilizer inner chamber 1, so as to increase the steam amount of the sterilizer inner chamber 1 and the air pressure of the sterilizer inner chamber 1. When the second inner chamber opening 12 is disconnected from the steam supply device and the evacuation device is opened, the steam supply device stops supplying steam to the sterilizer inner chamber 1, and at the same time, the evacuation device evacuates and discharges the steam from the sterilizer inner chamber 1, so that the air pressure in the sterilizer inner chamber 1 is reduced.

Wherein the communication and cutoff of the second internal chamber port 12 and the steam supply device can be regulated by a sixth piping valve provided in the sixth piping 66. The sixth pipeline 66 is provided with the steam-water separator 7, which is beneficial to reducing the content of condensed water in the steam and is beneficial to the pressure steam sterilizer to better exert the evacuation and sterilization effects.

The steam supply device supplies steam to the sterilizer inner chamber 1 and also supplies steam to the tube heating jacket 5 through the second pipe 62, so that the filter connection tube 30 is heated by the heated tube heating jacket 5, and the generation of condensed water when the steam flows through the filter connection tube 30 is prevented.

The above-mentioned tube heating jacket 5 encloses the filter connection tube 30, and the inner wall of the tube heating jacket 5 is separated from the outer wall of the filter connection tube 30, resulting in a cylindrical cavity between the filter connection tube 30 and the tube heating jacket 5. The pipe heating jacket 5 is connected to a steam supply device through a second pipe 62, and the steam supply device supplies steam of a high temperature to the pipe heating jacket 5, thereby heating and insulating the filter connection pipe 30. Wherein the second pipe 62 is provided with a second pipe valve for adjusting the time and flow rate of the steam flowing into the pipe heating jacket 5.

Furthermore, the above-mentioned pressure steam sterilizer may further comprise a seventh pipe 67 provided with a seventh pipe valve, and this seventh pipe 67 is provided between the second inner chamber port 12 and the vacuum-pumping device. The seventh pipeline 67 is directly communicated with the sterilizer inner chamber 1 and the vacuum-pumping device, and when the steam in the sterilizer inner chamber 1 is discharged to the vacuum-pumping device through the seventh pipeline 67, the steam in the sterilizer inner chamber 1 cannot flow through the sterilizing filter, so that the rapid discharge can be realized and the dryness degree of the sterilizing filter is not influenced.

In order to better exert the steam heating effect of the pipe heating jacket 5, the pipe heating jacket 5 includes an inlet 51 and an outlet 52, the inlet 51 of the pipe heating jacket 5 is communicated with the second pipeline 62, the outlet 52 of the pipe heating jacket 5 is communicated with the vacuum-pumping device through a third pipeline 63 and a steam trap 10 provided in the third pipeline 63, in short, the steam supply device, the second pipeline 62, the pipe heating jacket 5, the third pipeline 63 and the vacuum-pumping device are communicated in sequence.

When the second pipe line valve provided in the second pipe line 62 is opened, the steam supply device supplies steam to the pipe heating jacket 5, and at the same time, when the evacuation device and the drain valve 10 provided in the third pipe line 63 are both opened, the evacuation device can discharge the steam in the pipe heating jacket 5. Therefore, the steam supply equipment and the vacuum pumping equipment are matched with each other, and the high-temperature and constant state of the steam in the pipe heating sleeve 5 at a long-term position can be ensured.

In addition to the second, third, sixth and seventh pipes 62, 63, 66 and 67, the pressure steam sterilizer provided herein may be provided with a first pipe 61, a fourth pipe 64, a fifth pipe 65, and the like.

For example, the pressure steam sterilizer is provided with a fourth pipeline 64, the fourth pipeline 64 is arranged between the second sterilizing filter 32 and the vacuum-pumping device, and the air and the steam in the sterilizer inner chamber 1 sequentially flow through the first sterilizing filter 31, the filter connecting pipe 30, the second sterilizing filter 32, the fourth pipeline 64 and the vacuum-pumping device, and the air and the steam are discharged by the vacuum-pumping device to realize different degrees of vacuum-pumping on the sterilizer inner chamber 1.

In order to simplify the product structure and connection relationship of the vacuum-pumping device, the outlet end of the fourth pipeline 64 can be communicated with the inlet end of the vacuum-pumping device, and the outlet end of the third pipeline 63 is connected to the fourth pipeline 64, so that the medium flowing through the third pipeline 63 is collected in the fourth pipeline 64. Wherein the outlet end of the third conduit 63 is located downstream of the fourth conduit valve.

The pressure steam sterilizer may be provided with a fifth pipe 65. The fifth pipeline 65 is disposed between the sterilizer inner chamber 1 and the first sterilizing filter 31, and therefore, the sterilizer inner chamber 1 is communicated with the vacuum-pumping device, specifically, the first inner chamber port 11, the fifth pipeline 65, the first sterilizing filter 31, the filter connecting pipe 30, the second sterilizing filter 32 and the vacuum-pumping device are sequentially connected in series.

The pressure steam sterilizer can also be provided with a sterilizer outer chamber 2 and a first pipeline 61; the sterilizer outer chamber 2 is enclosed in the sterilizer inner chamber 1, in other words, the sterilizer inner chamber 1 and the sterilizer outer chamber 2 are nested to form a double-layer chamber, the chamber located on the inner side is the sterilizer inner chamber 1, and the chamber located on the outer side is the sterilizer outer chamber 2. The sterilizer outer chamber 2 is provided with an outer chamber port 21, and the outer chamber port 21 communicates with one end of a first pipe 61, and the other end of the first pipe 61 is used for connecting a steam supply device. Normally, the first pipe 61 is provided with a first pipe valve for controlling the pipe on/off state of the first pipe 61.

When the pressure steam sterilizer with the structure is used for sterilization, firstly, vacuumizing equipment is started, a sixth pipeline valve is closed, the sterilizer inner chamber 1 is vacuumized by the vacuumizing equipment, air including non-condensable gas in the sterilizer inner chamber 1 is exhausted, and the sterilizer inner chamber 1 reaches a certain vacuum degree; closing the vacuum-pumping equipment and opening a sixth pipeline valve to enable the steam supply equipment to supply steam to the sterilizer inner chamber 1, and performing high-temperature sterilization treatment on the to-be-sterilized articles placed in the sterilizer inner chamber 1 by using the steam, wherein the step can judge whether to stop supplying the steam to the sterilizer inner chamber 1 or not by taking the air pressure in the sterilizer inner chamber 1 rising to a specific value as a limit; in the third step, the vacuumizing device is started, the sixth pipeline valve is closed, and the steam in the sterilizer inner chamber 1 is pumped out again, wherein in the step, the steam is fully contacted with the articles to be sterilized in the sterilizer inner chamber 1, so that the steam is easy to carry pathogen organisms to flow to the vacuumizing device, therefore, the first sterilizing filter 31 and the second sterilizing filter 32 are used for realizing double filtration sterilization on the steam, and the steam discharged from the vacuumizing device is ensured not to carry pathogenic substances such as the pathogen organisms and the like; fourthly, closing the vacuum-pumping equipment, opening a sixth pipeline valve, and continuously introducing steam into the sterilizer inner chamber 1 to realize high-temperature sterilization treatment; step five, circulating the concrete operations of the step three and the step four to realize pulse type circulation sterilization; and finally, exhausting steam in the sterilizer inner chamber 1 and taking out the sterilized articles to be sterilized.

Furthermore, the evacuation apparatus mentioned herein generally comprises an atmospheric ejector 8 and a water-ring vacuum pump 9, the atmospheric ejector 8 is located upstream of the water-ring vacuum pump 9, and the substances flowing into the water-ring vacuum pump 9 need to enter the atmospheric ejector 8 first and then enter the water-ring vacuum pump 9.

To sum up, in order to avoid that condensed water generated during the pulsation sterilization of steam is attached to the filter element to affect the operating efficiency of the pressure steam sterilizer and the filter element thereof, two sterilizing filters are arranged on the basis of the existing single filter to form a redundant structure, thereby ensuring the use safety of the pressure steam sterilizer, meanwhile, corresponding heating sleeves are arranged on the periphery of any sterilizing filter and the periphery of the filter connecting pipe 30 between the two sterilizing filters, the heating sleeves are utilized to improve the temperature of the sterilizing filter and the filter connecting pipe 30, and reduce the temperature difference between the steam entering and exiting the sterilizing filter and the filter connecting pipe 30, thereby reducing the generation of the condensed water and realizing the rapid vaporization of the generated condensed water, reducing the probability that the filter element in the sterilizing filter is wetted, ensuring the permeability of the filter element, and shortening the pulsation stage time of the steam during the pulsation sterilization, the production efficiency of the steam in the pulse sterilization is improved.

The pressure steam sterilizer provided in the present application is described in detail above. The principles and embodiments of the present application are described herein using specific examples, which are only used to help understand the method and its core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, the present application can also make several improvements and modifications, and those improvements and modifications also fall into the protection scope of the claims of the present application.

Claims (10)

1. A pressure steam sterilizer is characterized by comprising a sterilizer inner chamber (1) and a vacuum-pumping device; the sterilizer inner chamber (1) is connected with the vacuum-pumping equipment through a sterilizing filter, and a heating sleeve is arranged on the outer periphery of the sterilizing filter.

2. A pressure steam sterilizer as claimed in claim 1, characterized in that the sterilizing filter comprises a first sterilizing filter (31) and a second sterilizing filter (32) in series; the heating jacket includes enclosing the filter heating jacket (4) of locating first degerming filter (31) periphery with second degerming filter (32) periphery respectively.

3. A pressure steam sterilizer as claimed in claim 2, characterized in that a filter connection pipe (30) is connected in series between the first sterilizing filter (31) and the second sterilizing filter (32); the heating jacket further comprises a pipe heating jacket (5) arranged around the periphery of the filter connecting pipe (30).

4. A pressure steam sterilizer as claimed in claim 3, wherein the sterilizer inner chamber (1) comprises a first inner chamber port (11) and a second inner chamber port (12); the first inner chamber port (11) is connected with the sterilizing filter, the second inner chamber port (12) is provided with a sixth pipeline (66) used for connecting a steam supply device, and the sixth pipeline (66) is provided with a sixth pipeline valve and a steam-water separator (7); the pipe heating jacket (5) is provided with a second pipeline (62) for connecting a steam supply device and a second pipeline valve arranged on the second pipeline (62).

5. A pressure steam steriliser as claimed in claim 4, wherein the second internal chamber port (12) is connected to the vacuum means via a seventh conduit (67) and a seventh conduit valve provided in the seventh conduit (67).

6. A pressure steam sterilizer as claimed in claim 4, characterised in that the tube heating jacket (5) comprises an inlet (51) and an outlet (52); the inlet (51) is communicated with the second pipeline (62), and the outlet (52) is communicated with the vacuum-pumping device through a third pipeline (63); the third pipeline (63) is provided with a drain valve (10).

7. A pressure steam sterilizer as claimed in claim 6, characterized in that a fourth conduit (64) and a fourth conduit valve provided in the fourth conduit (64) are provided between the second sterilizing filter (32) and the evacuation device; the outlet end of the third conduit (63) is connected to the fourth conduit (64) and is located downstream of the fourth conduit valve.

8. A pressure steam sterilizer as claimed in any one of claims 2 to 7, wherein the filter heating jacket (4) is an electrical heating jacket or a steam heating jacket.

9. A pressure steam steriliser as claimed in any of claims 1 to 7, wherein the evacuating means comprises an atmospheric air ejector (8) and a water ring vacuum pump (9).

10. A pressure steam sterilizer as claimed in any of claims 1 to 7, characterised in that the sterilizer inner chamber (1) is peripherally provided with a sterilizer outer chamber (2); the outer chamber opening (21) of the sterilizer outer chamber (2) is provided with a first pipeline (61) used for connecting steam supply equipment and a first pipeline valve arranged on the first pipeline (61).

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