CN218979857U - High pressure sterilizer - Google Patents

Abstract

The application discloses an autoclave, it includes sterilization case, bleed subassembly and sterilization case, and the heating element is installed to the bottom of sterilization case, and the sterilization case is installed and is used for spacing the locating part in the sterilization case with the sterilization case, and a plurality of through-holes have been seted up to the lateral wall of sterilization case, and a plurality of through-holes set up along sterilization case circumference, leave the clearance between sterilization case and the lateral wall of sterilization case; the sterilizing cylinder is internally provided with a connecting rod and a plurality of trays, the connecting rod is detachably connected to the trays, and the trays are arranged along the axial direction of the connecting rod at intervals. The multi-layer sterilizing device comprises a plurality of trays which are arranged in a multi-layer manner in the sterilizing cylinder, wherein during sterilization, objects to be sterilized are firstly placed on the trays in sequence, so that the contact and crowding conditions among the objects to be sterilized are reduced, and the objects to be sterilized are arranged in the multi-layer manner and are not easy to stack; the sterilizing effect of the object to be sterilized is improved.

Description

High pressure sterilizer

Technical Field

The present application relates to the field of sterilization equipment, and in particular to an autoclave.

Background

The high-pressure steam sterilizer is a device for rapidly and reliably sterilizing articles by using saturated pressure steam, is classified into a portable high-pressure steam sterilizer, a vertical high-pressure steam sterilizer and the like according to the style and the size, is widely used in units of medical sanitation, scientific research, agriculture and the like, and can sterilize medical instruments, dressings, glassware, solution culture media and the like.

In the related art, for example, when a vertical high-pressure steam sterilizer is used for sterilizing objects to be sterilized, the objects to be sterilized are directly placed in a sterilizing box of the high-pressure sterilizer, the objects to be sterilized are not limited, if the objects to be sterilized are more, the objects to be sterilized are crowded and stacked together, and the sterilizing effect is poor, so that a certain improvement space exists.

Disclosure of Invention

In order to effectively reduce the conditions of crowding and stacking objects to be sterilized and improve the sterilization effect of the objects to be sterilized, the application provides an autoclave.

The application provides an autoclave adopts following technical scheme:

an autoclave, comprising: the sterilizing device comprises a sterilizing box, an air extraction assembly and a sterilizing cylinder, wherein a heating part is arranged at the bottom of the sterilizing box, a limiting part for limiting the sterilizing cylinder in the sterilizing box is arranged at the sterilizing box, a plurality of through holes are formed in the side wall of the sterilizing cylinder, the through holes are circumferentially arranged along the sterilizing cylinder, and gaps are reserved between the outer side wall of the sterilizing cylinder and the sterilizing box; the sterilizing cylinder is internally provided with a connecting rod and a plurality of trays, the connecting rod is detachably connected with the trays, and the trays are arranged at intervals along the axial direction of the connecting rod.

By adopting the technical scheme, the air extraction component is used for extracting air from the sterilization box so as to extract original cold air in the sterilization box out of the sterilization box when the sterilization box is opened with steam, the limiting piece limits the sterilization barrel at the position right above the heating piece in the sterilization box, so that before the heating piece is subjected to high-pressure steam sterilization, a worker adds water into the sterilization box and then bypasses the heating piece, so that the heating piece heats and boils the water to form steam, the steam rises and penetrates through the through hole of the sterilization barrel to sterilize objects to be sterilized in the sterilization barrel, the contact relative humidity of the steam and the objects to be sterilized is small, the occurrence of wet package is effectively prevented, and the sterilization effect of the high-pressure sterilizer is improved; when a worker utilizes a vacuum sterilizer to sterilize objects to be sterilized, the objects to be sterilized are firstly placed on the plurality of object trays in sequence, so that the contact and crowding conditions among the objects to be sterilized are reduced, and the plurality of object trays are divided into a multi-layer structure through connecting columns, namely, the objects to be sterilized are arranged in a multi-layer manner, so that stacking is not easy to occur; the sterilization effect of the object to be sterilized is improved.

Preferably, the tray is provided with two, and the tray is provided with a plurality of ventilation holes arranged at intervals.

By adopting the technical scheme, the two trays are respectively positioned at the two opposite ends of the sterilizing cylinder along the vertical direction; the arrangement of the air holes is convenient for steam to escape in the sterilizing cylinder so as to achieve better sterilizing effect.

Preferably, the top of a plurality of thing trays all is provided with spacing ring strip, spacing ring strip is followed the thing tray circumference sets up.

Through adopting above-mentioned technical scheme, spacing ring strip sets up along tray circumference, and spacing ring strip can be with waiting the sterilization thing spacing in the tray to effectively reduce staff and put into the sterilization section of thick bamboo with the tray and take out the in-process that needs to remove the tray thing tray such as tray thing tray from the sterilization section of thick bamboo in, wait the circumstances that the sterilization thing in the tray dropped.

Preferably, a hanging component is arranged at the bottom of one of the trays, and the hanging component comprises: the hanger is fixedly arranged on the object tray, the hanging ring is connected with the hanger in a hanging mode, and the hanging ring is inserted into the pipe orifice of the object placing pipe.

By adopting the technical scheme, the hanging assembly is suitable for the type of the object to be sterilized which needs to be hung; when the staff utilizes the autoclave to sterilize, the object to be sterilized can be placed in the object placing pipe, then one end of the hanging ring is inserted into the pipe orifice of the object placing pipe, namely the object placing pipe is sealed, and the other end of the hanging ring is hung on the hook in the next step, so that the applicability of the autoclave is improved.

Preferably, the top of connecting rod is provided with the handle ring, one of them the tray is provided with first screens piece, first screens piece is located the tray is close to one side of handle ring, first screens piece with spacing ring strip fixed connection, the sterilization section of thick bamboo corresponds the position of first screens piece is installed and is limited the piece, first screens piece butt in limit the piece.

By adopting the technical scheme, the handle ring is convenient for a worker to hold so as to place the tray into the sterilizing cylinder or take the tray from the sterilizing cylinder; the first clamping block is limited at a fixed position in the sterilizing cylinder through the limiting block, namely, the connecting rod and the tray at the top are limited in the sterilizing cylinder through the first clamping block and the limiting block, so that the limiting stability of the tray in the sterilizing cylinder is effectively improved.

Preferably, a second clamping block is arranged at the bottom of the other tray, the second clamping block is abutted to the bottom of the sterilizing cylinder, and the through hole is further formed in the bottom of the sterilizing cylinder.

Through adopting above-mentioned technical scheme, the second tray of sterilization section of thick bamboo bottom leaves the clearance between through second screens piece and the sterilization section of thick bamboo to steam escapes through the through-hole of sterilization section of thick bamboo bottom and the air vent of tray, is convenient for realize the steam sterilization effect in the tray.

Preferably, the sterilization box is provided with a safety air valve in a communicating manner, the safety air valve is an electromagnetic valve, the safety air valve is coupled with an overpressure control circuit for controlling the safety air valve to be opened or closed, and the overpressure control circuit comprises:

the air pressure detection unit is used for detecting air pressure in the sterilization box and outputting an air pressure detection signal;

a signal comparing unit coupled to the air pressure detecting unit and provided with a threshold signal VREF, the signal comparing unit comparing the air pressure detecting signal with the threshold signal VREF and outputting a comparison signal, the comparison signal comprising: a first class of level signals and a second class of level signals;

the switch unit is coupled to the signal comparison unit and connected in series in the power supply loop of the safety air valve so as to output a switch signal after receiving the comparison signal, wherein the switch signal comprises: the safety valve is opened when the opening signal is received, and is closed when the closing signal is received.

By adopting the technical scheme, the safety air valve is used for exhausting when the air pressure in the sterilizing box exceeds the normal working range, for example, the normal working air pressure of the high-pressure sterilizer is 0.22mp, and when the real-time working air pressure of the high-pressure sterilizer is increased to 0.24mp, the sterilizing box works under overpressure, and the sterilizing box needs to be exhausted to protect the safe operation together; specifically, the air pressure detection unit detects working air pressure in the sterilization box in real time and outputs an air pressure detection signal, when the working air pressure in the autoclave is smaller, the air pressure detection signal output by the signal comparison unit is smaller than a threshold signal VREF, the signal comparison unit outputs a second level signal, the switch unit sends a shut-off signal to control the power supply loop of the safety air valve to be shut off after receiving the second level signal, and the safety air valve is shut off; when the working air pressure in the high-pressure sterilizer gradually increases along with the operation of the air extraction component until the air pressure detection signal is larger than the threshold signal VREF, the air pressure detection signal output by the signal comparison unit is larger than the threshold signal VREF, the signal comparison unit outputs a first level signal, the switch unit outputs an opening signal to control the conduction of a power supply loop of the safety air valve after receiving the first level signal, and the safety air valve starts to operate so as to exhaust the air in the sterilization box out of the sterilization box, thereby realizing the safety protection function of exhausting when the high-pressure sterilization box operates under overpressure.

Preferably, the air pressure detecting unit includes: the detection end of the air pressure sensor is positioned in the sterilization box.

Through adopting above-mentioned technical scheme, air pressure sensor is used for detecting the atmospheric pressure in the sterilization case and exports atmospheric pressure detection signal to signal comparison unit to be convenient for realize the atmospheric pressure detection effect to the sterilization case.

Preferably, the signal comparison unit includes: the first signal input end of the comparator N is coupled to the output end of the air pressure detection unit, the second signal input end of the comparator N is coupled to the threshold signal VREF, and the signal output end of the comparator N is coupled to the switch unit.

By adopting the technical scheme, the first signal input end of the comparator N is a positive-phase voltage input end, and the second signal input end of the comparator N is an inverse-phase voltage input end; the first type of level signals are high level signals, and the second type of level signals are low level signals; the comparator N compares the air pressure detection signal received by the first signal input end with the threshold value signal VREF of the second signal input end, and feeds back the comparison value of the air pressure detection signal and the threshold value signal VREF at the first time, so that the function of comparing the air pressure detection signal is realized.

Preferably, the switching unit includes: triode Q1 and outage delay relay KT, triode Q1's base coupling is in comparator N's signal output part, triode Q1's projecting pole with the coil of outage delay relay KT is established ties the back ground connection, triode Q1's collecting electrode coupling is in power VCC, outage delay relay KT includes delay normally open contact switch KT-1, delay normally open contact switch KT-1 establishes ties in the power supply return circuit of relief valve.

By adopting the technical scheme, the triode Q1 is an NPN triode, the base electrode of the triode Q1 is conducted when receiving a high-level signal (namely a first-class level signal), the coil of the power-off delay relay KT is powered on, the delay normally-open contact switch KT-1 is closed, and the power supply loop of the safety air valve is conducted to discharge air in the sterilization box out of the sterilization box; the base electrode of the triode Q1 is cut off when receiving a low-level signal (namely a second-class level signal), the coil of the outage delay relay KT is not electrified, and the delay normally-open contact switch KT-1 is kept in an off state, namely the power supply loop of the safety air valve is not conducted. The safety air valve is kept in a closed state.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the steam rises and penetrates through the through hole of the sterilizing cylinder to sterilize the object to be sterilized in the sterilizing cylinder, so that the relative humidity of the contact of the steam and the object to be sterilized is small, the situation of wet packaging is effectively prevented, and the sterilizing effect of the high-pressure sterilizer is improved; when a worker utilizes a vacuum sterilizer to sterilize objects to be sterilized, the objects to be sterilized are firstly placed on the plurality of object trays in sequence, so that the contact and crowding conditions among the objects to be sterilized are reduced, and the plurality of object trays are divided into a multi-layer structure through connecting columns, namely, the objects to be sterilized are arranged in a multi-layer manner, so that stacking is not easy to occur; the sterilization effect of the object to be sterilized is improved;

2. the hanging component is suitable for the type of the to-be-sterilized object to be hung; when a worker uses the autoclave to sterilize, the object to be sterilized can be placed in the object placing pipe, then one end of the hanging ring is inserted into the pipe orifice of the object placing pipe, namely the object placing pipe is sealed, and the other end of the hanging ring is hung on the hook, so that the applicability of the autoclave is improved;

3. the safety air valve is used for exhausting when the air pressure in the sterilizing box exceeds the normal working range, for example, the normal working air pressure of the autoclave is 0.22mp, and when the real-time working air pressure of the autoclave is increased to 0.24mp, the sterilizing box works under overpressure, and the sterilizing box needs to be exhausted to protect the safe operation together; specifically, the air pressure detection unit detects working air pressure in the sterilization box in real time and outputs an air pressure detection signal, when the air pressure detection signal output by the signal comparison unit is larger than a threshold value signal VREF, the signal comparison unit outputs a first level signal, the switch unit outputs an opening signal to control the conduction of a power supply loop of the safety air valve after receiving the first level signal, and the safety air valve starts to operate so as to exhaust air in the sterilization box out of the sterilization box, so that the safety protection function of exhausting air in the overpressure operation of the high-pressure sterilization box is realized.

Drawings

Fig. 1 is a schematic diagram of an overall mounting structure of an embodiment of the present application.

Fig. 2 is a cross-sectional view of an integral mounting structure of an embodiment of the present application.

Fig. 3 is an exploded view of the mounting structure of the sterilization drum, tray and hitch assembly in an embodiment of the present application.

Fig. 4 is a partial enlarged view of a in fig. 2.

Fig. 5 is a circuit diagram of an over-voltage control circuit of an embodiment of the present application.

Reference numerals illustrate:

1. a sterilization box; 11. a heating member; 12. a limiting piece; 13. a case cover; 14. a lid assembly; 15. a universal wheel; 16. a safety air valve; 2. an air extraction assembly; 3. a sterilization cylinder; 31. a through hole; 32. a connecting rod; 321. a handle ring; 33. defining a block; 34. a sealing cover; 35. a grip hole; 4. a tray; 41. ventilation holes; 42. a limiting ring strip; 43. a first clamping block; 44. a second clamping block; 5. a hitching assembly; 51. a hook; 52. hanging rings; 53. a storage tube; 6. an air pressure detecting unit; 7. a signal comparison unit; 8. a switching unit; 9. and a prompting unit.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-5.

The embodiment of the application discloses an autoclave. Referring to fig. 1 and 2, the autoclave comprises a sterilization box 1, an air extraction assembly 2 and a sterilization cylinder 3, wherein a heating element 11 is arranged at the bottom in the sterilization box 1, and the heating element 11 is a heating pipe; the sterilizing box 1 is provided with a limiting piece 12 for limiting the sterilizing cylinder 3 in the sterilizing box 1; the top of the sterilization box 1 is provided with a box cover 13 and a cover assembly 14 for covering the box cover 13 on the top of the sterilization box 1; four universal wheels 15 are respectively arranged at four corners of the bottom of the shell of the sterilization box 1, and the universal wheels 15 facilitate the movement of the autoclave by workers; the side wall and the bottom of the sterilizing cylinder 3 are provided with a plurality of through holes 31, the through holes 31 on the side wall of the sterilizing cylinder 3 are arranged along the circumferential direction of the sterilizing cylinder 3, and the through holes 31 on the bottom of the sterilizing cylinder 3 are arranged at intervals; a gap is reserved between the outer side wall of the sterilizing cylinder 3 and the sterilizing box 1; the steam rises and passes through the through hole 31 of the sterilizing drum 3 to sterilize the object to be sterilized (not shown in the figure) in the sterilizing drum 3, so that the relative humidity of the contact of the steam and the object to be sterilized is small, and the occurrence of wet package is effectively prevented.

Referring to fig. 2 and 3, the sterilizing cartridge 3 is installed with a connection rod 32 and a plurality of trays 4, and in this embodiment, two trays 4 are provided; the connecting rods 32 are detachably connected to the trays 4, the two trays 4 are arranged at intervals along the axial direction of the connecting rods 32, and the connecting rods 32 are perpendicular to the trays 4; the tray 4 is provided with a plurality of ventilation holes 41 which are arranged at intervals, the ventilation holes 41 are arranged along the circumferential direction of the connecting rod 32, and the arrangement of the ventilation holes 41 is convenient for steam to escape in the sterilizing cylinder 3 so as to achieve a better sterilizing effect; the tops of the two trays 4 are provided with limiting ring strips 42, and the limiting ring strips 42 are arranged along the circumferential direction of the trays 4; the bottom of one of the trays 4 positioned at the top of the sterilizing cylinder 3 is provided with the hanging assembly 5, so that the placing range of the objects to be sterilized is enlarged, and a plurality of objects to be sterilized are not easy to stack; the sterilization effect of the object to be sterilized is improved.

Referring to fig. 2 and 3, the limiting members 12 are limiting blocks, three limiting blocks are arranged, the three limiting blocks are arranged along the circumferential direction of the sterilization box 1, and the limiting members 12 limit the sterilization cylinder 3 at a position right above the heating member 11 in the sterilization box 1; the top opening of sterilization section of thick bamboo 3, the top of sterilization section of thick bamboo 3 is provided with the closing cap 34 that is used for shutoff sterilization section of thick bamboo 3 open-ended, and two hold hole 35 have been seted up to sterilization section of thick bamboo 3's top lateral wall, and two hold hole 35 are located sterilization section of thick bamboo 3's opposite both sides respectively, hold the pore wall in hole 35 and be convenient for hold in order to remove sterilization section of thick bamboo 3.

Referring to fig. 2 and 4, the top of the connecting rod 32 is provided with a handle ring 321, one of the trays 4 positioned at the top of the sterilizing cartridge 3 is provided with two first clamping blocks 43, the two first clamping blocks 43 are respectively positioned at two opposite sides of the tray 4, the first clamping blocks 43 are positioned at one side of the tray 4 close to the handle ring 321, the first clamping blocks 43 are fixedly connected with the limiting ring strips 42, and the first clamping blocks 43 are perpendicular to the central axis of the limiting ring strips 42; the sterilizing cylinder 3 is provided with limiting blocks 33 at positions corresponding to the two first clamping blocks 43, the two first clamping blocks 43 are arranged in one-to-one correspondence with the two limiting blocks 33, and the first clamping blocks 43 are abutted to one side, close to the handle ring 321, of the limiting blocks 33; the bottom of another tray 4 is provided with three second screens piece 44, and three second screens piece 44 sets up along tray 4 circumference, and second screens piece 44 butt is in the bottom of sterilizing section of thick bamboo 3 to make the tray 4 that is located sterilizing section of thick bamboo 3 bottom and sterilizing section of thick bamboo 3 bottom between leave the clearance, so that the steam that heating element 11 produced escapes through a plurality of through-holes 31 of sterilizing section of thick bamboo 3 bottom, improved the sterilization effect of autoclave.

Referring to fig. 2 and 4, the hitching assembly 5 is provided with two sets, the hitching assemblies 5 of the two sets being located on opposite sides of the connecting rod 32, respectively; the hanging assembly 5 comprises a hanging hook 51, a hanging ring 52 and a storage tube 53, wherein the hanging hook 51 is fixedly arranged on one of the trays 4 positioned at the top of the sterilizing cylinder 3, the top of the hanging ring 52 is hung on the hanging hook 51, the bottom of the hanging ring 52 is inserted into the mouth of the storage tube 53, and the storage tube 53 is used for placing articles to be sterilized; the hitching assembly 5 is adapted to dressing type articles to be sterilized, thereby improving the applicability of the autoclave.

Referring to fig. 1 and 5, the sterilization case 1 is provided with a safety air valve 16 in communication, the safety air valve 16 is an electromagnetic valve, the safety air valve 16 is coupled with an overpressure control circuit for controlling the safety air valve 16 to be opened or closed, and the overpressure control circuit comprises an air pressure detection unit 6, a signal comparison unit 7 and a switch unit 8.

Referring to fig. 5, the air pressure detecting unit 6 is for detecting air pressure in the sterilization case 1 and outputting an air pressure detection signal; the air pressure detection unit 6 comprises an air pressure sensor, and the detection end of the air pressure sensor is positioned in the sterilization box 1.

Referring to fig. 5, a signal comparing unit 7 is coupled to the air pressure detecting unit 6 and provided with a threshold signal VREF, the signal comparing unit 7 compares the air pressure detecting signal with the threshold signal VREF and outputs a comparison signal including a first type level signal and a second type level signal; the first type of level signals are high level signals, and the second type of level signals are low level signals; the signal comparison unit 7 comprises a comparator N, wherein a first signal input end of the comparator N is a positive phase voltage input end, and a second signal input end of the comparator N is an inverse phase voltage input end; the first signal input end of the comparator N is coupled to the air pressure sensor, the second signal input end of the comparator N is coupled to the threshold signal VREF, and the signal output end of the comparator N is coupled to the switch unit 8.

Referring to fig. 5, the switch unit 8 is coupled to the signal comparing unit 7 and is connected in series in the power supply loop of the safety valve 16, so as to output a switch signal after receiving the comparing signal, wherein the switch signal comprises an on signal and an off signal, the switch unit 8 outputs the on signal after receiving the first class level, the switch unit 8 outputs the off signal after receiving the second class level, the safety valve 16 is opened when receiving the on signal, and the safety valve 16 is closed when receiving the off signal; the switch unit 8 comprises a triode Q1 and a power-off delay relay KT, the triode Q1 is an NPN triode, the base electrode of the triode Q1 is coupled to the signal output end of the comparator N, the emitting electrode of the triode Q1 is connected with the coil of the power-off delay relay KT in series and then grounded, the collecting electrode of the triode Q1 is coupled to the power supply VCC, the power-off delay relay KT comprises a delay normally open contact switch KT-1, and the delay normally open contact switch KT-1 is connected in series in a power supply loop of the safety air valve 16.

Referring to fig. 1 and 5, the overpressure control circuit further includes a prompting unit 9, where the prompting unit 9 is coupled to an output end of the switch unit 8 to output an acousto-optic prompting signal after receiving the opening signal, so as to prompt a worker that an overpressure condition occurs in the sterilization case 1 at this time, and the safety air valve 16 is being started to operate.

Referring to fig. 5, the prompt unit 9 includes a light emitting diode LED having an anode coupled to the power source VCC, a cathode coupled to the cathode of the transistor Q1, and a light emitting diode LED mounted on the outer sidewall of the sterilization case 1.

The implementation principle of the autoclave in the embodiment of the application is as follows: when a worker uses an autoclave to sterilize objects to be sterilized, firstly, water is added into the sterilization box 1, so that the water is used for overflowing the heating element 11 at the bottom of the sterilization box 1, then objects to be sterilized are sequentially placed on the two layers of trays 4, the objects to be sterilized on the trays 4 are limited in the limiting ring strips 42 (not shown in the figure), meanwhile, the objects to be sterilized similar to dressing can be placed in the object placing tube 53 and hung on the hanging hook 51 through the hanging ring 52, the sterilization box 1 is covered by the covering assembly 14 in the next step, then, the autoclave is started to heat the sterilization cylinder 3 to complete the effect of high-pressure steam sterilization, and the objects to be sterilized can be reasonably arranged in the sterilization cylinder 3 without crowding and stacking by the arrangement of the trays 4 and the hanging assembly 5, so that the sterilization effect of the objects to be sterilized is improved.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (10)

1. An autoclave, comprising: the sterilizing box is characterized in that a heating piece (11) is arranged at the bottom of the sterilizing box (1), a limiting piece (12) used for limiting the sterilizing box (3) in the sterilizing box (1) is arranged on the sterilizing box (1), a plurality of through holes (31) are formed in the side wall of the sterilizing box (3), the through holes (31) are circumferentially arranged along the sterilizing box (3), and gaps are reserved between the outer side wall of the sterilizing box (3) and the sterilizing box (1); install connecting rod (32) and a plurality of tray (4) in sterilizing cylinder (3), connecting rod (32) detachably connect in tray (4), a plurality of tray (4) are followed the axial interval setting of connecting rod (32).

2. An autoclave as claimed in claim 1, wherein two trays (4) are provided, and wherein the trays (4) are provided with a plurality of ventilation holes (41) arranged at intervals.

3. An autoclave as claimed in claim 1, wherein a plurality of trays (4) are each provided with a stop collar strip (42) at the top, the stop collar strips (42) being circumferentially arranged along the trays (4).

4. An autoclave according to claim 3, wherein the bottom of one of the trays (4) is provided with a hooking assembly (5), the hooking assembly (5) comprising: couple (51), link (52) and put thing pipe (53), couple (51) fixed mounting in tray (4), link (52) articulate in couple (51), link (52) peg graft in the mouth of pipe of putting thing pipe (53).

5. An autoclave as claimed in claim 3, wherein a handle ring (321) is provided at the top of the connecting rod (32), one of the trays (4) is provided with a first clamping block (43), the first clamping block (43) is located at one side of the tray (4) close to the handle ring (321), the first clamping block (43) is fixedly connected with the limit ring strip (42), a limiting block (33) is mounted at a position of the sterilizing cylinder (3) corresponding to the first clamping block (43), and the first clamping block (43) is abutted to the limiting block (33).

6. An autoclave as claimed in claim 5, wherein a second clamping block (44) is arranged at the bottom of the other tray (4), the second clamping block (44) is abutted to the bottom of the sterilizing cylinder (3), and the through hole (31) is further formed at the bottom of the sterilizing cylinder (3).

7. An autoclave according to claim 1, wherein the sterilization tank (1) is provided in communication with a safety gas valve (16), the safety gas valve (16) being a solenoid valve, the safety gas valve (16) being coupled with an overpressure control circuit for controlling the opening or closing of the safety gas valve (16), the overpressure control circuit comprising:

an air pressure detection unit (6), wherein the air pressure detection unit (6) is used for detecting the air pressure in the sterilization box (1) and outputting an air pressure detection signal;

a signal comparing unit (7) coupled to the air pressure detecting unit (6) and provided with a threshold signal VREF, the signal comparing unit (7) comparing the air pressure detecting signal with the threshold signal VREF and outputting a comparison signal, the comparison signal comprising: a first class of level signals and a second class of level signals;

a switching unit (8) coupled to the signal comparing unit (7) and connected in series in the power supply loop of the safety air valve (16) to output a switching signal after receiving the comparison signal, the switching signal comprising: the safety valve comprises an opening signal and a closing signal, wherein the opening signal is output by the switch unit (8) after the first type of level is received, the closing signal is output by the switch unit (8) after the second type of level is received, the safety valve (16) is opened when the opening signal is received, and the safety valve (16) is closed when the closing signal is received.

8. An autoclave according to claim 7, wherein the air pressure detection unit (6) comprises: the detection end of the air pressure sensor is positioned in the sterilization box (1).

9. An autoclave according to claim 7, wherein the signal comparison unit (7) comprises: the first signal input end of the comparator N is coupled to the output end of the air pressure detection unit (6), the second signal input end of the comparator N is coupled to the threshold signal VREF, and the signal output end of the comparator N is coupled to the switch unit (8).

10. An autoclave according to claim 9, wherein the switching unit (8) comprises: triode Q1 and outage delay relay KT, triode Q1's base coupling is in comparator N's signal output part, triode Q1's projecting pole with the ground connection behind the coil series connection of outage delay relay KT, triode Q1's collecting electrode coupling is in power VCC, outage delay relay KT includes time delay normally open contact switch KT-1, time delay normally open contact switch KT-1 series connection is in the power supply loop of relief valve (16).

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