CN116908337B

CN116908337B - Sample gas separation protection device for chromatograph

Info

Publication number: CN116908337B
Application number: CN202311116131.1A
Authority: CN
Inventors: 徐洋; 陆雨; 杨文飞
Original assignee: Nanjing Ciyu Environmental Technology Co ltd
Current assignee: Nanjing Kangce Automation Equipment Co ltd
Priority date: 2023-08-31
Filing date: 2023-08-31
Publication date: 2024-03-08
Anticipated expiration: 2043-08-31
Also published as: CN116908337A

Abstract

The invention provides a sample gas separation protection device for a chromatograph, which belongs to the technical field of sample gas treatment and comprises an air inlet interface, wherein a shell is arranged below the air inlet interface, a mounting seat is connected to a lower wire of the shell, a sealing ring and a sealing gasket are arranged at the joint of the upper surface of the mounting seat and the shell, a plurality of tower heads are arranged on the mounting seat, a water-blocking filter pipe is arranged on the plurality of tower heads, plugs are arranged on the plurality of water-blocking filter pipes, and a discharge cavity is reserved in the mounting seat.

Description

Sample gas separation protection device for chromatograph

Technical Field

The invention belongs to the technical field of sample gas treatment, and particularly relates to a sample gas separation protection device for a chromatograph.

Background

In the VOCs smoke continuous monitoring system, the detected sample gas is often mixed with impurities such as liquid water, tar and the like, and the corresponding chromatographic analysis instrument internal pipeline has small drift diameter of about 0.6mm, so that the requirements on the cleanliness of the sample gas are quite high. However, many VOC monitoring sites have serious smoke pollution and many impurities, and the gas chromatograph is used as a system core instrument, is extremely easy to be polluted by unclean samples, and causes system paralysis.

Therefore, the impurities such as non-gaseous water, tar and the like in the sample gas are filtered and screened out to ensure the cleanliness of the sample gas, the damage to the chromatograph is weakened, the impurities such as the non-gaseous water, the tar and the like after the treatment and filtration are discharged, the valve is used, the connection between the valve and the discharge channel is connected by a connecting mechanism to ensure the sealing, but the connection between some channels for conveying liquid and the valve is easy to have the phenomenon of distortion shape change, the connection between the connection and the channels is not closely deviated, and the filtered impurities leak out to cause environmental pollution, thereby providing the sample gas separation protection device for the chromatograph.

Disclosure of Invention

The invention provides a sample gas separation protection device for a chromatograph, which aims to solve the problems that impurities such as non-gaseous water and tar in the sample gas damage the chromatograph, the connection between a valve and a discharge channel is ensured to be sealed by using a connection mechanism, but the connection between some channels for conveying liquid and the valve is easy to have distortion shape change, the connection between the connection and the channels is not closely deviated, and the filtered impurities leak out to cause environmental pollution.

The embodiment of the invention provides a sample gas separation protection device for a chromatograph, which comprises an air inlet interface, wherein a shell is arranged below the air inlet interface, a mounting seat is arranged below the shell, a sealing ring and a sealing pad are arranged at the joint of the upper surface of the mounting seat and the shell, a plurality of tower heads are arranged above the mounting seat, a water-blocking filter pipe is arranged on the plurality of tower heads, plugs are arranged above the plurality of water-blocking filter pipes, a discharge cavity is reserved in the mounting seat, a communication cavity channel communicated with the tower heads is reserved in the mounting seat, an air outlet interface is arranged below the mounting seat, a valve is arranged on the side of the mounting seat, two ends of the valve and the mounting seat are respectively provided with a discharge channel, and a connecting unit is arranged between one ends of the discharge channels which are close to each other;

the connecting unit comprises a connecting section and a pair of wire sleeves, the connecting section and the wire sleeves are in wire connection, the connecting section and the wire sleeves are in mutual interference, a driving part which is in mutual interference with the inner wall of the wire sleeves is arranged on the connecting section, a connecting cavity is reserved in the connecting section, a restraining part I in the connecting cavity is arranged in the connecting section, a pressing cavity is reserved at the side of the discharging channel, a pressing part is arranged in the pressing cavity, and a restraining part II which is mutually connected with the pressing part and the restraining part I is arranged in the wire sleeves.

Further, the first restraining part comprises a middle rod movably arranged in the connecting cavity, one end of the middle rod is provided with a stopping part which is in contact with the second restraining part, and one end of the middle rod, which is farther from the stopping part, is provided with the connecting part.

Further, the restraining part comprises a jackscrew which is connected with the wire sleeve through wires, a retainer ring is arranged below the jackscrew, and the retainer ring and the restraining part are movably connected with each other.

Further, the top pressure part comprises a stop table arranged on the wall surface of the discharging channel, a stop cavity is reserved on the stop table, a displacement cavity is reserved on the inner wall of the stop cavity, the displacement table is movably arranged in the displacement cavity, one side of the displacement table is rotatably connected with an application table, a downward-inclined guide rod is arranged below the application table, and a guide cavity is reserved below the stop cavity.

Further, the middle rod comprises an extension table arranged at one end of the middle rod, the extension table is screwed with the constraint rod, one end of the constraint rod and the check ring are in contact with each other, and the other end of the constraint rod and the inner wall of the extension table are in contact with each other.

Further, the connecting part comprises a plunger rod arranged at one end of the middle rod and a plug-in table arranged at one end of the inside of the plunger rod, and an inward sinking cavity matched with the plug-in table is arranged in the connecting cavity.

Further, a restoring table is arranged on the side of the middle rod, a restoring chamber movably connected with the restoring table is reserved on the cavity surface of the connecting cavity, and a spiral beryllium copper wire I connected with the restoring table is arranged in the restoring chamber.

Further, a containing cavity is reserved on the extension table, and the constraint rod and the containing cavity are matched with each other.

Further, a second spiral beryllium copper wire connected with the displacement table is arranged below the application table, and a third spiral beryllium copper wire connected with the displacement table is arranged below the displacement cavity.

The beneficial effects of the invention are as follows:

1. the invention is characterized in that the connecting section is arranged on the wall surface of the connecting part of the discharging channel, then the connecting section is tightly connected with the connecting section through the wire sleeve, so that 2 driving parts press and press 2 discharging channels, the orientation of the connecting section is restrained firstly, then the restraining part I on the connecting section and the pressing part on the discharging channel are pressed by the restraining part II, so that the tight connection of the wire sleeve and the connecting section can be ensured, and the phenomenon that the connecting part of the wire sleeve and the connecting part of the wire sleeve deviates after the wire sleeve operates for a long time can be reduced, and the connecting section can operate for a longer time.

2. The invention can make the connection of 2 wire connectors in a vertical span more closely under the top pressure of the second constraint part by the middle rod and the connection part, thus making the 2 wire connectors better constraint the driving part.

3. According to the invention, the restraining part II is pressed against the application platform, the application platform moves along the displacement cavity under the traction of the displacement platform, and the guide rod below the application platform moves into the guide cavity at the cavity bottom of the stop cavity, so that the purposes of restraining the wire connection sleeve and the discharge channel are achieved, and the probability of the offset phenomenon of the connection section and the discharge channel is reduced.

4. The invention can improve the connection and fastening between the discharging channels, so that the discharging channels can be tightly connected when the distortion form of the discharging channels is changed, and the connection unit has longer working life.

5. According to the invention, through the cooperation of the water-blocking filter pipe, the draining cavity, the pagoda head and the like, non-gaseous moisture and other impurities in the sample gas can be removed and discharged, so that the cleanliness of the sample gas is ensured, and the gas chromatograph is protected.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a coupling unit according to an embodiment of the present invention;

FIG. 3 is a schematic view of a constraint part II according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a coupling unit according to an embodiment of the present invention;

FIG. 5 is a schematic view of the structure of FIG. 4 at C;

FIG. 6 is a schematic view of the structure of FIG. 5 at D;

reference numerals: 1. an air inlet interface; 2. a mounting base; 3. a plug; 4. a water-blocking filter tube; 5. a pagoda head; 6. a seal ring; 7. a sealing gasket; 8. an air outlet interface; 9. a housing; 10. discharging the cavity; 112. a coupling section; 1122. a coupling cavity; 11222. a recovery chamber; 11223. a first spiral beryllium copper wire; 113. a wire connecting sleeve; 114. a drain passage; 1142. a top pressure cavity; 1143. a pressing part; 11432. a stop table; 11433. a stop cavity; 11434. a displacement chamber; 11435. a displacement table; 11436. an application station; 11437. a guide bar; 11438. a guide chamber; 11439. spiral beryllium copper wire II; 115. a driving part; 116. a first constraint part; 1162. a middle rod; 11622. an extension table; 11623. a restraint bar; 11624. a return station; 11625. a receiving chamber; 1163. a stop portion; 1164. a coupling part; 11642. a rod; 11643. a plugging table; 11644. an invagination cavity; 117. a second constraint part; 1172. a jackscrew; 11722. a retainer ring; 12. a communicating channel; 13. and (3) a valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the technical solutions of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention. Like reference numerals in the drawings denote like parts. It should be noted that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.

Referring to fig. 1-6, an embodiment of the present invention provides a sample gas separation protection device for chromatograph, including an air inlet port 1, a housing 9 is installed under the air inlet port 1, a valve 13 is installed on the side of the housing 2, a sealing ring 6 and a sealing pad 7 are installed at the joint between the upper surface of the housing 9 and the housing 9, a plurality of tower heads 5 are installed on the upper surface of the housing 2, water-blocking filter pipes 4 are installed on the plurality of tower heads 5, a plug 3 is installed on the upper surface of the plurality of water-blocking filter pipes 4, a drain cavity 10 is reserved in the housing 2, a communicating cavity 12 communicating with the tower heads 5 is reserved in the housing 2, an air outlet port 8 is installed under the housing 2, a valve 13 is installed on the side of the housing 2, a drain channel 114 is installed on both ends of the valve 13 and the housing 2, a coupling unit is installed between one end of the drain channel 114, the coupling unit comprises a coupling section 112 and a pair of wire sleeves 113, the coupling section 112 is installed on the end portions of the drain channel 114, and the coupling section 115 is installed on both sides of the coupling section 113 and the coupling section 115 is applied with external force via the two wire sleeves.

When the connecting section 112 and the wire connectors 113 on two sides are connected with each other, the connecting cavity 1122 is arranged in the upper surface and the lower surface of the connecting section 112, the first restraining parts 116 are arranged in the connecting cavity 1122, wire connectors are reserved on the upper surface and the lower surface of the connecting section 112 and the wire connectors 113, the second restraining parts 117 are arranged in the wire connectors, and the first restraining parts 116 on one transverse horizontal line and the second restraining parts 117 on the wire connectors 113 on two sides are respectively in pressing connection with each other.

The second constraint 117 comprises a push wire 1172 and a retainer 11722, the push wire 1172 being threaded into the wire interface, the retainer 11722 being disposed around the tip of the push wire 1172.

The first restraint portion 116 includes an intermediate bar 1162, one end of the intermediate bar 1162 is provided with a stopper portion 1163, and the other end of the intermediate bar 1162 is provided with a coupling portion 1164. During assembly, the top wire 1172 is screwed in, the retainer ring 11722 pulls the stop part 1163 to displace, so that the middle rod 1162 moves along the connecting cavity 1122 under the pull of the stop part 1163, and the connecting part 1164 on one side of the middle rod 1162 and the connecting part 1164 on the other side of the middle rod 1162 are connected with each other, so that the purpose of connecting the two wire connectors 113 more firmly can be achieved.

The stopper 1163 comprises an expansion table 11622 and a constraint rod 11623, the expansion table 11622 is fixedly connected to one end of the middle rod 1162 which is farther from the connecting part 1164, the middle of the constraint rod 11623 and one side of the middle rod 1162 are connected in a screwed mode, the constraint rod 11623 is fixedly connected to the upper side of one end of the constraint rod 11623, which is close to the expansion table 11622, a containing cavity 11625 which is movably connected with the constraint rod is reserved on the upper side of the opening of the connecting cavity 1122, the area of the opening of the containing cavity 11625 is slightly larger than that of the constraint rod, and the area occupied by the opening of the connecting cavity 1122 is slightly larger than the vertical span of the middle rod 1162.

To ensure that the hold down bar 11623 returns to its original orientation, a helical beryllium copper wire four is provided under the hold down bar 11623. After the knob 1172 is screwed in, the retainer ring 11722 pulls the restraining bar 11623 to rotate, at this time, the expansion table 11622 and the intermediate bar 1162 move along the coupling restraining chamber under the pull of the restraining bar 11623, and the restraining table is displaced downward under the pull of the restraining bar 11623 to be inserted into the receiving chamber 11625, and the coupling portion 1164 at the other end of the intermediate bar 1162 achieves the coupling purpose with each other.

The coupling portion 1164 includes a plug 11642 and a socket 11643, the plug 11642 is fitted to one end of the intermediate bar 1162 farther from the expansion table 11622, the cross section of the plug 11642 is arch-shaped, and the socket 11643 is fitted inside the plug 11642 and is located at one end farther from the intermediate bar 1162. To allow the pins 11642 to be coupled to each other, a recess 11644 is provided in each pin 11642 and adjacent one end of the intermediate pin 1162 to accommodate the mating block 11643 on the other pin 11642. To facilitate separation, a return station 11624 is provided on the side wall of each intermediate bar 1162, 2 return chambers 11222 each having an orientation matching with the orientation of the 2 return stations 11624 are reserved on the side wall of the connecting chamber 1122, and a first beryllium copper wire 11223 is provided in the return chamber 11222 and connected to the return stations 11624.

During assembly, the intermediate bar 1162 moves under the traction of the constraint bar 11623 until the insertion blocks 11643 on the 2 insertion blocks 11642 are respectively inserted into the recessed cavities 11644 of the appropriate positions, and during separation, the intermediate bar 1162 can return to the original state due to the spiral beryllium copper wire 11223.

In order to fasten the connection with the discharge channel 114, a top pressure chamber 1142 is reserved on the side wall of the discharge channel 114, and a top pressure portion 1143 is disposed in the top pressure chamber 1142. The top pressing portion 1143 includes a stopper 11432, a stopper cavity 11433 is reserved on the stopper 11432, a displacement cavity 11434 is reserved on 2 opposite surfaces of the stopper cavity 11433, and a displacement table 11435 is movably coupled to the displacement cavity 11434.

The sides of the 2 displacement tables 11435, which are close to each other, are all pinned to the application table 11436, the lower surface of the application table 11436 is obliquely and downwardly fixedly connected with the guide bar 11437, and the bottom mirror image of the stop cavity 11433 is provided with 2 guide cavities 11438 which are respectively matched with the guide bar 11437.

To allow the top press 1143 to return to the original orientation, a second helical beryllium copper wire 11439 is disposed below the application station 11436 and coupled to the side wall of the displacement station 11435, and a third helical beryllium copper wire is disposed within the displacement chamber 11434 and coupled to the lower side of the displacement station 11435.

During operation, the gas outlet port 8 is communicated with the gas chromatograph, and when the sample gas is introduced, the sample gas is introduced through the gas inlet port 1, then the sample gas removes non-gaseous moisture and other impurities in the sample gas through the plug 3 in the shell 9, the sample gas flows into the gas chromatograph through the water-blocking filter pipe 4 to the pagoda head 5, the communication cavity 12 and the gas outlet port 8, the filtered moisture and impurities are removed by the water-blocking filter pipe 4, the filtered moisture and impurities flow into the discharge channel 114 through the discharge cavity 10 to be opened and discharged through the valve 13, so that the non-gaseous moisture and other impurities in the sample gas can be removed and discharged, the cleanliness of the sample gas is ensured, and the gas chromatograph is protected.

And the valve 13 is communicated with the mounting seat 2 to control the discharge of filtered impurities, so that the valve 13 and the discharge channel 114 on the mounting seat 2 are connected and assembled, the precession jackscrew 1172 moves downwards in the assembly process, the tip end of the jackscrew 1172 presses against the application table 11436, the application table 11436 moves downwards and pulls the displacement table 11435 to move downwards along the displacement cavity 11434, and the guide rod 11437 below the application table 11436 is moved to be plugged into the guide cavity 11438 with the adapting position, so as to achieve the aim of being more tightly connected with the discharge channel 114. During separation, the top wire 1172 is unscrewed, and the application station 11436 and displacement station 11435 are then returned to the original orientations, respectively, by the second and third coiled beryllium copper wires 11439, respectively, facilitating separation of the coupling unit.

The connecting section 112 is arranged at the connecting ends of the 2 discharging channels 114 which are close to each other, and then the wire connecting sleeve 113 is screwed into two ends of the connecting section 112 so that the driving parts 115 are propped against the side walls of the discharging channels 114; the plurality of jackscrews 1172 are then threaded into the orientation of the fitting of the hub 113 and against the restraint bars 11623, shi Jiatai 11436 such that the restraint stations are drawn through the restraint bar 11623 to move into the receiving cavity 11625 and the docking stations 11643 on the 2 intermediate bars 1162 drawn toward each other are restrained against each other such that the positioning blocks are drawn through the application station 11436 to move into the guide cavity 11438 to achieve the goal of restraining the position, such that the assembly is completed.

The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a chromatograph is with appearance gas separation protection device, its characterized in that includes inlet connection (1), install shell (9) below inlet connection (1), silk next mount pad (2) below shell (9), seal circle (6) are installed in the position of laminating above mount pad (2) and shell (9), be installed a plurality of pagoda heads (5) above mount pad (2), install water blocking filter tube (4) on a plurality of pagoda heads (5), install end cap (3) above a plurality of water blocking filter tube (4), reserve drain cavity (10) in mount pad (2), reserve in mount pad (2) with the communication cavity (12) of pagoda head (5) intercommunication, install outlet connection (8) below mount pad (2), valve (13) are installed to the avris of mount pad (2), valve (13) are installed on both ends and are installed on mount pad (2) and are installed between drain channels (114) each other closely;

the connecting unit comprises a connecting section (112) and a pair of wire connectors (113), the connecting section (112) and the wire connectors (113) are connected in a wire mode, the connecting section (112) and the wire connectors (113) are in mutual interference, a driving part (115) which is in mutual interference with the inner wall of the wire connectors (113) is arranged on the connecting section (112), a connecting cavity (1122) is reserved in the connecting section (112), a restraining part I (116) which is positioned in the connecting cavity (1122) is arranged in the connecting section (112), a pressing cavity (1142) is reserved at the side of the discharging channel (114), a pressing part (1143) is arranged in the pressing cavity (1142), and a restraining part II (117) which is connected with the pressing part (1143) and the restraining part I (116) is arranged in the wire connectors (113);

wire interfaces are reserved on the upper surface and the lower surface of the connecting section (112) and each wire sleeve (113), constraint parts II (117) are arranged in each wire interface, and 2 constraint parts I (116) on a transverse horizontal line are respectively in pressing connection with constraint parts II (117) on the wire sleeves (113) on two sides;

the second constraint part (117) comprises a jackscrew (1172) and a retainer ring (11722), the jackscrew (1172) is screwed into the screw interface, and the retainer ring (11722) is arranged at the tip of the jackscrew (1172) in a surrounding manner;

the first constraint part (116) comprises a middle rod (1162), one end of the middle rod (1162) is provided with a stop part (1163), the other end of the middle rod (1162) is provided with a connecting part (1164), the side wall of the discharge channel (114) is reserved with a jacking cavity (1142), and the jacking cavity (1142) is internally provided with a jacking part (1143);

the stop part (1163) comprises an expansion table (11622) and a constraint rod (11623), and the expansion table (11622) is fixedly connected to one end of the middle rod (1162) which is farther from the connecting part (1164);

the connecting part (1164) comprises a plug rod (11642) and a plug-in table (11643), the plug rod (11642) is assembled at one end of the middle rod (1162) which is farther from the extending table (11622), the cross section of the plug rod (11642) is arch-shaped, the plug-in table (11643) is assembled inside the plug rod (11642) and is positioned at one end which is farther from the middle rod (1162), the plug rods (11642) which can be close to each other are connected with each other, and thus, the concave cavities (11644) which are assembled with the plug-in table (11643) on the other plug rod (11642) are reserved in each plug rod (11642) and are close to one end of the middle rod (1162);

the pressing part (1143) comprises a stop table (11432), a stop cavity (11433) is reserved on the stop table (11432), a displacement cavity (11434) is reserved on 2 opposite cavity surfaces of the stop cavity (11433), a displacement table (11435) is movably connected in the displacement cavity (11434), one sides of the 2 displacement tables (11435) close to each other are all pin-connected with an application table (11436), a guide rod (11437) is obliquely and downwards fixedly connected below the application table (11436), and 2 guide cavities (11438) matched with the guide rod (11437) are respectively arranged at the cavity bottom mirror image of the stop cavity (11433).

2. The sample gas separation and protection device for chromatograph according to claim 1, wherein: the first restraining part (116) comprises an intermediate rod (1162) movably arranged in the connecting cavity (1122), one end of the intermediate rod (1162) is provided with a stopping part (1163) which is in mutual interference with the second restraining part (117), and one end of the intermediate rod (1162) which is farther from the stopping part (1163) is provided with a connecting part (1164).

3. The sample gas separation protection device for chromatograph according to claim 2, wherein: the second restraining part (117) comprises a jackscrew (1172) screwed on the wire connecting sleeve (113), a retainer ring (11722) is arranged below the jackscrew (1172), and the retainer ring (11722) and the first restraining part (116) are movably connected with each other.

4. The sample gas separation and protection device for chromatograph according to claim 1, wherein: the top pressing part (1143) comprises a stop table (11432) arranged on the wall surface of the discharge channel (114), a stop cavity (11433) is reserved on the stop table (11432), a displacement cavity (11434) is reserved on the inner wall of the stop cavity (11433), a displacement table (11435) is movably arranged in the displacement cavity (11434), one side of the displacement table (11435) is screwed with an application table (11436), a guide rod (11437) obliquely downwards is arranged below the application table (11436), and a guide cavity (11438) is reserved below the stop cavity (11433).

5. A sample gas separation protector for a chromatograph according to claim 3, characterized in that: the middle rod (1162) comprises an extension table (11622) arranged at one end of the middle rod (1162), the extension table (11622) is screwed with a constraint rod (11623), one end of the constraint rod (11623) and a retainer ring (11722) are in interference with each other, and the other end of the constraint rod (11623) and the inner wall of the extension table (11622) are in interference with each other.

6. The sample gas separation protection device for chromatograph according to claim 2, wherein: the connecting part (1164) comprises a plunger rod (11642) arranged at one end of the middle rod (1162), a plug-in table (11643) arranged at one end of the inside of the plunger rod (11642), and an inward sinking cavity (11644) matched with the plug-in table (11643) is arranged inside the connecting cavity (1122).

7. The sample gas separation and protection device for chromatograph according to claim 6, wherein: a restoring table (11624) is arranged on the side of the middle bar (1162), a restoring chamber (11222) movably connected with the restoring table (11624) is reserved on the cavity surface of the connecting cavity (1122), and a spiral beryllium copper wire I (11223) connected with the restoring table (11624) is arranged in the restoring chamber (11222).

8. The sample gas separation and protection device for chromatograph according to claim 5, wherein: the expansion table (11622) is provided with a containing cavity (11625), and the constraint rod (11623) and the containing cavity (11625) are matched with each other.

9. The sample gas separation protector for chromatograph according to claim 4, wherein: a second spiral beryllium copper wire (11439) connected with the displacement table (11435) is arranged below the application table (11436), and a third spiral beryllium copper wire connected with the displacement table (11435) is arranged below the displacement cavity (11434).