A medical liquid oxygen safety spherical storage tank

Abstract

The present invention relates to the field of liquid oxygen storage tank equipment, and discloses a medical liquid oxygen safety spherical storage tank, including a tank body, the tank body is arranged in a spherical shape, a valve box is arranged at the rear of the tank body, the valve box is used to arrange valves and pipelines, a support mechanism is arranged at the bottom of the tank body, the support mechanism is used to expand the support area of ​​the tank body, and a detection mechanism is also arranged on the support mechanism, and the detection mechanism is used to detect the temperature change around the tank body. By setting the support mechanism, the support area can be increased when the spherical tank body is installed, and the spherical tank body can be installed more stably. There is no need to cast a cement base so that the tank body can be in a steady state environment when in use, thereby ensuring the safety of the tank body. At the same time, the output port at the bottom of the tank body is detected in real time by using a detection structure to prevent the output port of the tank body from changing from a small leak to a large leak before being discovered, so as to discover potential dangers in advance and further improve the safety of the tank body.

Description

Technical Field

[0001] The invention relates to the field of liquid oxygen storage tank equipment, in particular to a medical liquid oxygen safety spherical storage tank. Background Art

[0002] Under the existing technology, compressed oxygen cylinders are mostly used to store oxygen, which is very inconvenient to use. The oxygen cylinders need to be repeatedly transported, replaced and replenished, which consumes huge manpower and wastes energy. However, the total expansion ratio of liquid oxygen is as high as 860:1. Choosing liquid oxygen instead of general gaseous oxygen can greatly reduce the energy waste caused by replacing oxygen cylinders.

[0003] However, the existing liquid oxygen storage tanks still have some defects in use. For example, for the long tube type liquid oxygen storage tank, for the sake of stability, it is generally necessary to cast a cement base when installing the liquid oxygen storage tank to prevent the storage tank from being installed unstable, which makes the liquid oxygen storage tank difficult to carry and inconvenient to install, limiting the mobility of the hydraulic storage tank. Summary of the invention

[0004] The purpose of the present invention is to provide a medical liquid oxygen safety spherical storage tank to solve the technical problem that, for the sake of stability, a long tube type liquid oxygen storage tank generally needs to cast a cement base when installing the liquid oxygen storage tank to prevent the storage tank from being unstable, resulting in the liquid oxygen storage tank being difficult to carry and inconvenient to install, and limiting the mobility of the hydraulic storage tank.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A medical liquid oxygen safety spherical storage tank comprises a tank body, which is arranged in a spherical shape. A valve box is arranged at the rear of the tank body, and the valve box is used to arrange valves and pipelines. A supporting mechanism is arranged at the bottom of the tank body, and the supporting mechanism is used to expand the supporting area of ​​the tank body. A detection mechanism is also arranged on the supporting mechanism, and the detection mechanism is used to detect temperature changes around the tank body.

[0007] Further, the support mechanism includes: a support column, the support column is arranged at the bottom of the base, the top of the support column constitutes a mounting groove adapted to the bottom of the tank body, a pull rod is arranged between two adjacent support columns, one end of the pull rod is hinged on the side wall of one of the support columns, and the other end is movably connected to a slide groove provided on the other support column;

[0008] A groove is provided at the top center of the support column, a top column is slidably connected in the groove, the top column and the movable end of the pull rod are movably connected via a connecting piece, an insertion rod is slidably connected to the bottom of the slide groove, and a support spring is provided between the insertion rod and the bottom of the slide groove.

[0009] Furthermore, a safety mechanism is provided at the bottom of the tank body, and the safety mechanism includes a hanging chain, and the hanging chain ball is hinged at the bottom center of the tank body. A counterweight body is fixed to the bottom of the hanging chain, and a safety groove is provided on the side wall of one of the top columns around the counterweight ball. A compression spring is fixed in the safety groove, and a safety valve is provided on the output port of the tank body, and the valve handle of the safety valve is connected to one end of a connecting rod; the counterweight body and the connecting rod are connected by a linkage assembly.

[0010] Furthermore, the connecting assembly includes a cross bar, the other end of the connecting rod is connected to the cross bar, one end of the cross bar is fixedly provided with a No. 1 inclined block, and the other end is fixed to the counterweight body through a ring, and the other end of the compression spring is fixed with a No. 2 inclined block, and the No. 1 inclined block is in contact with the inclined surface of the No. 2 inclined block. When the cross bar is offset, the connecting rod will be driven to offset, so that the valve handle moves to open the safety valve, allowing the liquid oxygen in the tank body to leak out.

[0011] Furthermore, the detection mechanism includes: a detection sensor, which is used to detect whether there is leakage at the output port of the tank body, an annular member is sleeved on the outside of the output port of the tank body, and the annular member wraps the output port of the tank body, and a knocking component is provided on the outside of the annular member, and the knocking component is used to knock the annular member.

[0012] Further, the knocking assembly includes a solar panel, which is arranged on the top of the valve box, a kit is arranged on the outside of the annular member, the kit is fixedly arranged on the bottom of the tank body, and an annular groove is arranged on the outside of the kit, a plurality of through grooves are opened in the annular groove, one side of the through groove is arranged as an arc surface, a swivel is arranged on the outside of the kit, a slot is arranged on the inside of the swivel, a knocking column is slidably connected in the slot, a reset spring is arranged between the knocking column and the slot, and the end of the knocking column is slidably installed in the annular groove;

[0013] The motor is fixedly mounted on the outer side wall of the kit, the output shaft of the motor is transmission-connected with a gear, the gear is rotationally mounted on the kit, the gear is meshed with a gear ring for transmission, and a gear ring is fixedly arranged on the top of the rotating ring.

[0014] Furthermore, a detector is provided on the support column away from the tank body, and the detector is used to detect the knocking sound generated between the knocking column and the output port of the tank body. A sound amplifier can also be installed at the bottom of the tank body to amplify the knocking sound.

[0015] Furthermore, the annular member is made of plastic material, and the knocking column is made of metal material. The annular member becomes brittle when liquid oxygen leaks from the output port of the tank body.

[0016] Beneficial effects of the present invention:

[0017] (1) The present invention can eliminate the need for pouring a cement base through the coordination of a spherical tank body and a supporting mechanism, thereby saving installation time and eliminating the difficulty in carrying and installing a liquid oxygen storage tank. The present invention can also use the deadweight of the tank body to press the top column, which can, on the one hand, allow the pull rod to swing downward, so that the two supporting columns change from an N-type to an H-type, thereby further enhancing the structural strength of the supporting columns. On the other hand, the downward deflection of the pull rod can be used to achieve auxiliary tightening of the insertion rod, thereby increasing the contact tightness between the supporting mechanism and the ground, thereby further improving the safety of the tank body.

[0018] (2) The safety mechanism of the present invention can, on the one hand, increase the counterweight during the initial installation of the tank body to maintain the center of gravity of the tank body in balance, so that the tank body is stable after installation; on the other hand, in the event of an earthquake, the counterweight body can be shaken by using earthquake vibration, thereby pulling the crossbar connecting rod, and finally realizing the opening of the safety valve at the output port of the tank body, actively discharging liquid oxygen, and preventing the risk of tank body explosion;

[0019] (3) The present invention can determine whether the ring-shaped part is damaged according to the embrittlement condition of the ring-shaped part by continuously knocking with a knocking rod, so that the knocking rod directly contacts the output port of the tank body and emits a knocking sound, and then uses a detector to detect the knocking sound for coordination. Compared with directly using a sensor to detect the tank body output port at a close distance, which is easy to be damaged, the close-range embrittlement and the long-distance detection of the knocking sound can more reliably determine the liquid oxygen leakage situation, thereby improving the safety of storing liquid oxygen in the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the pull rod in the present invention;

[0023] Figure 3 It is a structural schematic diagram of the insurance mechanism in the present invention;

[0024] Figure 4 for Figure 3 Partial cross-sectional view of AA;

[0025] Figure 5 It is a three-dimensional schematic diagram of the testing mechanism;

[0026] Figure 6 for Figure 5 Schematic diagram of the internal structure.

[0027] Description of the drawings: 1. Tank body; 2. Valve box; 3. Support mechanism; 31. Support column; 32. Pull rod; 33. Slide groove; 34. Groove; 35. Top column; 36. Insert rod; 37. Support spring; 4. Safety mechanism; 41. Suspension chain; 42. Counterweight body; 43. Safety groove; 44. Compression spring; 45. Safety valve; 46. Connecting rod; 47. Cross bar; 48. No. 1 oblique block; 49. No. 2 oblique block; 5. Detection mechanism; 51. Detection sensor; 52. Ring member; 53. Knocking assembly; 531. Solar panel; 532. Kit; 533. Annular groove; 534. Through groove; 535. Arc surface; 536. Swivel; 537. Slot; 538. Knocking column; 539. Reset spring; 540. Motor; 541. Gear; 542. Gear ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 6 As shown, the present invention is a medical liquid oxygen safety spherical storage tank, including a tank body 1, the tank body 1 is set in a spherical shape, a valve box 2 is set at the rear of the tank body 1, the valve box 2 is used to arrange valves and pipelines, and a support mechanism 3 is set at the bottom of the tank body 1, the support mechanism 3 is used to expand the support area of ​​the tank body 1, and a detection mechanism 5 is also set on the support mechanism 3, and the detection mechanism 5 is used to detect the temperature change around the tank body 1. In this embodiment, by setting the support mechanism 3, the support area can be increased when the spherical tank body 1 is installed, so that the spherical tank body 1 can be installed more stably, so that the tank body 1 is in a steady state environment when in use, and the safety of the tank body 1 is ensured. At the same time, by using the setting of the detection structure, the output port at the bottom of the tank body 1 can be detected in real time to prevent the output port of the tank body 1 from changing from a small leak to a large leak before it is discovered, and an explosion occurs in serious cases, which is convenient for early detection of potential dangers and further improves the safety of the tank body 1.

[0030] Furthermore, the support mechanism 3 includes: a support column 31, the support column 31 is arranged at the bottom of the base, the top of the support column 31 constitutes a mounting groove adapted to the bottom of the tank body 1, and a pull rod 32 is arranged between two adjacent support columns 31, one end of the pull rod 32 is hinged on the side wall of one of the support columns 31, and the other end is movably connected to a slide groove 33 provided on the other support column 31;

[0031] A groove 34 is provided at the center of the top of the support column 31, and a top column 35 is slidably connected in the groove 34. The top column 35 is movably connected to the movable end of the pull rod 32 through a connecting piece. A plug rod 36 is slidably connected to the bottom of the slide groove 33, and a support spring 37 is provided between the plug rod 36 and the bottom of the slide groove 33. In this embodiment, a specific structure of the support mechanism 3 is provided, so as to achieve the purpose of increasing the support area of ​​the tank body 1 by the support mechanism 3. When in use, the support column 31 is first placed in advance to the position where the tank body 1 is to be placed. After the multiple support columns 31 are installed, the tank body 1 is placed in the installation grooves on the multiple support columns 31. The self-weight of the tank body 1 is used to press the top column 35 on the support column 31, so that the top column 35 moves downward, thereby driving the movable end of the pull rod 32 to swing downward. When the movable end swings downward, it just presses the plug rod 36 at the bottom of the slide groove 33, so that the plug rod 36 moves downward and stops being inserted into the soil, forming an auxiliary fixing effect; and the self-weight of the tank body 1 can be used to press the top column 35 on the support column 31, so that the top column 35 moves downward, thereby driving the movable end of the pull rod 32 to swing downward. When the movable end swings downward, it just presses the plug rod 36 at the bottom of the slide groove 33, so that the plug rod 36 moves downward and stops being inserted into the soil, forming an auxiliary fixing effect; and the tank body 1 can be used to By pressing the top column 35, on the one hand, the pull rod 32 can be swung downward, so that the two support columns 31 change from N-type to H-type, thereby further enhancing the structural strength of the support column 31. On the other hand, the downward movement of the pull rod 32 can also be used to achieve auxiliary tightening of the insertion rod 36, thereby increasing the contact tightness between the support mechanism 3 and the ground, and further improving the safety of the tank body 1. It should be noted that, as another embodiment, after the tank body 1 is placed in the installation groove formed on the support column 31, the support column 31 can be welded to the outer wall of the tank body 1, so that the support column 31 and the tank body 1 form an integrated structure, thereby ensuring the stability of the tank body 1 after placement, and further improving the safety of the liquid oxygen storage tank.

[0032] Furthermore, a safety mechanism 4 is provided at the bottom of the tank body 1, and the safety mechanism 4 includes a hanging chain 41, and the hanging chain 41 ball is hinged at the bottom center of the tank body 1, and a counterweight body 42 is fixed to the bottom of the hanging chain 41, and a safety groove 43 is provided on the side wall of one of the top columns 35 located around the counterweight ball, and a compression spring 44 is fixed in the safety groove 43, and a safety valve 45 is provided on the output port of the tank body 1, and the valve handle of the safety valve 45 is connected to one end of a connecting rod 46; the counterweight body 42 and the connecting rod 46 are connected by a linkage assembly.

[0033] The connecting assembly includes a cross bar 47, the other end of the connecting rod 46 is connected to the cross bar 47, one end of the cross bar 47 is fixedly provided with a No. 1 inclined block 48, and the other end is fixed to the counterweight body 42 through a ring, and the other end of the compression spring 44 is fixed with a No. 2 inclined block 49, and the No. 1 inclined block 48 is in contact with the inclined surface of the No. 2 inclined block 49. When the cross bar 47 is offset, it will drive the connecting rod 46 to offset, so that the valve handle moves to open the safety valve 45, allowing the liquid oxygen in the tank body 1 to leak out. In this embodiment, a safety mechanism 4 is also provided at the bottom of the tank body 1 to prevent the center of gravity problem of the tank body 1 when it is initially placed, and the explosion problem caused by excessive pressure due to violent shaking of the liquid storage tank when encountering disasters such as earthquakes. When encountering the above situation, the liquid oxygen stored in the tank body 1 can be released in advance in time to prevent the risk of worsening explosion. Specifically, during installation, the suspended counterweight 42 naturally droops under the action of its own weight, always maintaining the purpose of the vertical center, and also allowing the center of gravity of the tank body 1 to remain consistent after being placed in the installation slot. If an earthquake occurs and the ground vibrates, the counterweight 42 suspended at the bottom of the tank body 1 shakes, and the counterweight 42 The cross bar 47 fixed on one side is driven away. When the shaking amplitude is large, the No. 1 inclined block 48 fixed on one side of the cross bar 47 is forced to squeeze the No. 2 inclined block 49. The No. 2 inclined block 49 is passively pressed and compressed by the compression spring 44 under the squeezing force of the No. 1 inclined block 48. Therefore, the No. 1 inclined block 48 and the cross bar 47 can get rid of the pressure of the compression spring 44 and the No. 2 spring. The movement of the cross bar 47 drives the connecting rod 46 to move. When the cross bar 47 deviates, it drives the connecting rod 46 to deviate, so that the valve handle moves to open the safety valve 45, allowing the liquid oxygen in the tank body 1 to leak out of the tank body 1, so as to avoid the risk of explosion caused by the shaking of the tank body 1 in the earthquake state, and further improve the safety of the tank body 1.

[0034] The safety mechanism 4 in the present invention, on the one hand, can increase the counterweight during the initial installation process of the tank body 1 to maintain the balance of the center of gravity of the tank body 1, so that the tank body 1 is stable after installation; on the other hand, when an earthquake occurs, it can use the earthquake vibration to make the counterweight body 42 shake, thereby pulling the cross bar 47 and the connecting rod 46, and finally realize the opening of the safety valve 45 at the output port of the tank body 1, actively discharging liquid oxygen, and preventing the risk of explosion of the tank body 1.

[0035] Furthermore, the detection mechanism 5 includes: a detection sensor 51, which is used to detect whether there is leakage at the output port of the tank body 1. A ring-shaped member 52 is sleeved on the outside of the output port of the tank body 1, and the ring-shaped member 52 wraps the output port of the tank body 1. A knocking component 53 is provided on the outside of the ring-shaped member 52, and the knocking component 53 is used to knock the ring-shaped member 52. In this example, the output port of the tank body 1 is detected in real time by the detection sensor 51, so that the leakage of the tank body 1 can be monitored in time, and then small leakage can be curbed, and the leakage will not continue to deteriorate due to negligence and eventually end in explosion; at the same time, in order to prevent the detection sensor 51 from being damaged when the liquid oxygen leakage is large, a ring part 52 and a knocking component 53 are added. By knocking the ring part 52 by the knocking component 53, it is possible to indirectly judge whether the ring part 52 is damaged and indirectly verify whether a leakage occurs, thereby ensuring feedback on the liquid oxygen leakage and further ensuring the safety of the tank body 1; it should be noted that the detection sensor 51 is a prior art and can be one of a temperature sensor, a gas concentration sensor, etc.

[0036] Further, the knocking assembly 53 includes a solar panel 531, which is arranged on the top of the valve box 2, a set 532 is arranged on the outer side of the annular member 52, and the set 532 is fixedly arranged on the bottom of the tank body 1, and an annular groove 533 is arranged on the outer side of the set 532, and a plurality of through grooves 534 are opened in the annular groove 533, and one side of the through groove 534 is set as an arc surface 535, and a rotating ring 536 is arranged on the outer side of the set 532, and a slot 537 is arranged on the inner side of the rotating ring 536, and a knocking column 538 is slidably connected in the slot 537, and a reset spring 539 is arranged between the knocking column 538 and the slot 537, and the end of the knocking column 538 is slidably installed in the annular groove 533;

[0037] The motor 540 is fixedly mounted on the outer wall of the kit 532, and the output shaft of the motor 540 is connected to a gear 541, which is rotatably mounted on the kit 532, and the gear 541 is meshed with a gear ring 542 for transmission, and a gear ring 542 is fixedly arranged on the top of the rotating ring 536. Furthermore, a detector is arranged on the support column 31 away from the tank body 1, and the detector is used to detect the knocking sound generated between the knocking column 538 and the output port of the tank body 1, and a sound amplifier can also be installed at the bottom of the tank body 1 to amplify the knocking sound.

[0038] In this embodiment, the solar panel 531 is used to power the motor 540, the motor 540 drives the gear 541 to rotate, the gear 541 drives the ring gear 542 to rotate, the ring gear 542 mobilizes the rotating ring 536 to rotate the rod, and the rotating ring 536 will drive the knocking column 538 to slide circumferentially along the annular groove 533 when rotating. When encountering the through groove 534, the knocking column 538, which was originally in a compressed state, will instantly pop out from the through groove 534 and then impact the ring member 52, wherein the ring member 52 is made of plastic material. If liquid oxygen leaks, it will cause the ring member 52 to become brittle. Once the knocking column 538 impacts the brittle ring member 52, the ring member 52 will be broken, so the knocking column 538 will directly knock the tank On the outer wall of the output port of the tank body 1, both are made of metal, so a knocking sound occurs when they come into contact. At this time, a detector is installed on the outer support column 31 to detect the knocking sound, so that liquid oxygen leakage can be discovered in time and the leakage can be curbed. The present invention can determine whether the ring part 52 is damaged according to the embrittlement of the ring part 52 by continuously knocking with the knocking column 538, so that the knocking column 538 directly contacts the output port of the tank body 1 and makes a knocking sound, and then the knocking sound is detected by the detector for coordination. Compared with the situation that the output port of the tank body 1 is easily damaged by directly using a sensor to detect at close range, the close-range embrittlement and the long-distance detection of knocking sounds can more reliably determine the liquid oxygen leakage, thereby improving the safety of the tank body 1 storing liquid oxygen.

[0039] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A medical liquid oxygen safety spherical storage tank, comprising a tank body (1), wherein the tank body (1) is arranged in a spherical shape, a valve box (2) is arranged at the rear of the tank body (1), and the valve box (2) is used to arrange valves and pipelines, characterized in that: A support mechanism (3) is provided at the bottom of the tank body (1), and the support mechanism (3) is used to expand the support area of ​​the tank body (1). A detection mechanism (5) is also provided on the support mechanism (3), and the detection mechanism (5) is used to detect temperature changes around the tank body (1); the support mechanism (3) comprises: a support column (31), the support column (31) is provided at the bottom of the tank body (1), the top of the support column (31) forms a mounting groove adapted to the bottom of the tank body (1), a pull rod (32) is provided between two adjacent support columns (31), one end of the pull rod (32) is hinged to the side wall of one of the support columns (31), and the other end is movably connected to a slide groove (33) provided on the other support column (31); A groove (34) is provided at the center of the top of the support column (31), a top column (35) is slidably connected in the groove (34), the top column (35) is movably connected to the movable end of the pull rod (32) via a connecting piece, an insertion rod (36) is slidably connected to the bottom of the slide groove (33), a support spring (37) is provided between the insertion rod (36) and the bottom of the slide groove (33); the detection mechanism (5) comprises: a detection sensor (51), the detection sensor (51) is used to detect whether the output port of the tank body (1) leaks, an annular member (52) is sleeved on the outer side of the output port of the tank body (1), the annular member (52) wraps the output port of the tank body (1), a knocking component (53) is provided on the outer side of the annular member (52), the knocking component (53) is used to knock the annular member (52); the knocking component (53) 3) comprising a solar panel (531), the solar panel (531) being arranged on the top of the valve box (2), a sleeve (532) being arranged on the outer side of the annular member (52), the sleeve (532) being fixedly arranged on the bottom of the tank body (1), and an annular groove (533) being arranged on the outer side of the sleeve (532), a plurality of through grooves (534) being provided in the annular groove (533), one side of the through groove (534) being arranged as an arc surface (535), a rotating ring (536) being arranged on the outer side of the sleeve (532), a slot (537) being arranged on the inner side of the rotating ring (536), a knocking column (538) being slidably connected in the slot (537), a return spring (539) being arranged between the knocking column (538) and the slot (537), and an end of the knocking column (538) being slidably installed in the annular groove (533); The motor (540) is fixedly mounted on the outer wall of the kit (532); the output shaft of the motor (540) is drivingly connected to a gear (541); the gear (541) is rotatably mounted on the kit (532); the gear (541) is meshed with a gear ring (542) for transmission; the top of the rotating ring (536) is fixedly provided with a gear ring (542); the annular member (52) is made of a plastic material; the knocking column (538) is made of a metal material; and the annular member (52) becomes brittle when liquid oxygen leaks from the output port of the tank body (1).

2. The medical liquid oxygen safety spherical storage tank according to claim 1, characterized in that: The bottom of the tank body (1) is provided with a safety mechanism (4), the safety mechanism (4) comprising a suspension chain (41), the suspension chain (41) being spherically hinged at the bottom center of the tank body (1), a counterweight body (42) being fixed at the bottom of the suspension chain (41), a safety groove (43) being provided on the side wall of one of the top columns (35) around the counterweight body (42), a compression spring (44) being fixed in the safety groove (43), a safety valve (45) being provided on the output port of the tank body (1), a valve handle of the safety valve (45) being connected to one end of a connecting rod (46); the counterweight body (42) and the connecting rod (46) being connected by a linkage assembly.

3. The medical liquid oxygen safety spherical storage tank according to claim 2, characterized in that: The linkage assembly comprises a cross bar (47), the other end of the connecting rod (46) is connected to the cross bar (47), one end of the cross bar (47) is fixedly provided with a first inclined block (48), and the other end is fixed to the counterweight body (42) through a collar, and the other end of the cross bar (47) is fixed with a second inclined block (49) at the other end of the compression spring (44), the first inclined block (48) is in contact with the inclined surface of the second inclined block (49), and when the cross bar (47) is offset, the connecting rod (46) is driven to be offset, so that the valve handle moves to open the safety valve (45), allowing the liquid oxygen in the tank body (1) to leak out.

4. The medical liquid oxygen safety spherical storage tank according to claim 3, characterized in that: A detector is provided on a support column (31) away from the tank body (1), and the detector is used to detect the knocking sound generated between the knocking column (538) and the output port of the tank body (1). A sound amplifier may also be installed at the bottom of the tank body (1) to amplify the knocking sound.

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