A gas-liquid separation device capable of eliminating bubbles

Abstract

The present invention discloses a gas-liquid separation device capable of eliminating bubbles, relates to the technical field of gas-liquid separation, and aims to solve the problems of high energy consumption of gas-liquid separation in the prior art, and the separated liquid is easily dissolved with the gas again when being blown through the filter layer by the gas, which easily generates bubbles and forms foam, and there is no bubble removal mechanism, so the gas-liquid separation efficiency is reduced. The present invention makes the gas-liquid mixed gas move along the spiral leaves for centrifugal separation, and uses the separation plate to perform baffle separation at the same time, thereby improving the separation efficiency, and makes the separated liquid flow along the outer edge of the spiral leaves to reduce the contact with the gas and reduce the probability of bubble generation, and uses the drainage groove and the guide plate to make the flow state of the liquid smooth, eliminate the bubbles throughout the process, and use the gas flow to drive the foam breaking net to eliminate the bubbles again, thereby saving energy and improving the effect of eliminating bubbles, and uses the filter layer to re-filter the gas to enhance the gas-liquid separation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of gas-liquid separation, in particular to a gas-liquid separation device capable of eliminating bubbles. Background Art

[0002] A gas-liquid separator is a device used to separate gas and liquid in industrial liquid systems. Among existing gas-liquid separator equipment, gravity and circulation separators are mainly used to separate gas and liquid by gravity and centrifugal force.

[0003] The gas-liquid separator can be installed at the inlet and outlet of the gas compressor for gas-liquid separation, gas phase demisting after the condenser cooler at the top of the distillation tower, gas phase demisting of various gas water washing towers, absorption towers and analytical towers, etc. The gas-liquid separator can also be used in various industrial and civil applications such as gas dust removal, oil-water separation and liquid impurity removal.

[0004] There are many separation structures adopted by gas-liquid separators, and their separation methods include gravity separation, deflection separation, centrifugal separation, etc. The basic principle of gravity separation is that due to the different specific gravities of gas and liquid, when the liquid flows with the gas, the liquid will be subject to a greater gravity, resulting in a downward velocity, while the gas still flows in the original direction, that is, the liquid and gas have a tendency to separate in the gravitational field, and the downward liquid adheres to the wall, gathers together, and is discharged through the discharge pipe; the basic principle of deflection separation is to utilize the different specific gravities of gas and liquid. When the liquid and gas are mixed and flow together, if they encounter an obstruction, the gas will deflect and go away, while the liquid continues to have a forward velocity due to inertia. The forward-moving liquid adheres to the obstruction wall and gathers downward due to the action of gravity and is discharged through the discharge pipe; the basic principle of centrifugal separation is due to the different densities of gas and liquid. When the liquid and gas are mixed and flow together, the centrifugal force on the liquid is greater than that on the gas, so the liquid has a tendency to centrifugally separate. The liquid adheres to the separation wall and gathers downward due to the action of gravity and is discharged through the discharge pipe.

[0005] Chinese patent CN202022836203.8 discloses a gas-liquid separator, comprising an outer shell and an air-liquid separation barrel arranged inside the outer shell, with a cavity formed between the air-liquid separation barrel and the outer shell; the air-liquid separation barrel comprises an air-liquid separation chamber and a liquid collecting chamber, the air-liquid separation chamber is a barrel-shaped structure with a closed upper end, and the liquid collecting chamber is funnel-shaped and located below the air-liquid separation chamber; the side wall of the air-liquid separation chamber is a filter layer; a baffle is arranged on the inner side of the air-liquid separation chamber, one end of the baffle is connected to the side wall of the air-liquid separation chamber, and the other end is located in a different plane from the connection end; an impeller is also arranged in the air-liquid separation chamber for realizing centrifugal motion of the gas to be treated. The air-liquid separator is driven by electricity and uses centrifugal force to separate air and liquid, with high energy consumption, and the separated liquid is easily dissolved with the gas again when it is blown through the filter layer by the gas, and falls on the liquid collecting chamber at a fast speed, which is easy to generate bubbles and form foam. There is no bubble removal mechanism, which reduces the efficiency of air-liquid separation. Summary of the Invention

[0006] In view of the problems existing in the prior art, the present invention discloses a gas-liquid separation device capable of eliminating bubbles. The technical solution adopted is as follows: it includes a tank body, the tank body is a shell with a transparent top, an air inlet is provided on the top of the side wall of the tank body, a liquid outlet is provided at the bottom of the tank body, a valve is provided on the liquid outlet, a separation plate and a drainage groove are provided on the inner side wall of the tank body, the separation plate can perform preliminary separation of gas and liquid, a filter is provided on the drainage groove, the filter has multiple groups, the filter can perform preliminary filtering on the liquid flowing on the drainage groove, and eliminate bubbles generated during the separation process, a top cover is provided on the top opening of the tank body, and the top cover is of the same size as the tank body Matching, the top of the top cover is provided with an air outlet, the bottom of the top cover is provided with an airway tube, the airway tube is a shell that is transparent from top to bottom, the outer wall of the airway tube is provided with spiral leaves, the bottom of the spiral leaves corresponds to the top position of the drainage groove, the inner wall of the airway tube is provided with a bracket, the bracket has two groups, the brackets are provided with bearings, the bearings are provided with a rotating shaft, the top of the rotating shaft is provided with fan blades, the fan blades can be driven by gas flow, the bottom of the rotating shaft is provided with a sliding ring with a sliding connection, the slip ring is provided with a foam breaking net, the foam breaking nets have multiple groups and are symmetrically arranged, the symmetry of the foam breaking nets makes the center of gravity located at the center of the slip ring, and the rotation is more stable.

[0007] As a preferred technical solution of the present invention, there are multiple groups of separation plates, and separation blocks are provided on the separation plates. The separation blocks are multiple groups and arranged in a staggered manner. The separation blocks can block and separate the gas-liquid mixture, thereby improving the separation efficiency on the basis of centrifugal separation.

[0008] As a preferred technical solution of the present invention, the drainage groove includes an inner plate and a bottom plate, the inner plate is a spiral contraction structure, the bottom plate is a multi-layer spiral structure, the bottom of the inner plate is connected to the inner edge of the bottom plate, and the downward direction of the drainage groove is larger, so that the liquid flow slows down and the probability of generating bubbles is reduced.

[0009] As a preferred technical solution of the present invention, a guide plate is provided at the bottom of the drainage trough, and the guide plate is arranged at an angle. The guide plate is tilted downward on the side close to the tank body, so that the liquid can flow along the inner wall of the tank body after being guided by the guide plate, making the flow process smoother and reducing re-mixing with the gas.

[0010] As a preferred technical solution of the present invention, the spiral blades match the inner wall size of the tank body, the outer sides of the spiral blades are all inclined downward, and the outer edges of the spiral blades are provided with sealing strips. The spiral blades are sealed with the inner wall of the tank body, and the condensed liquid can flow down along the outer edges of the spiral blades, thereby improving the effect of centrifugal separation.

[0011] As a preferred technical solution of the present invention, a filter layer is provided inside the airway tube. The filter layer has multiple groups and can perform a final filtration on the gas when it flows out of the tank, thereby improving the gas-liquid separation effect.

[0012] As a preferred technical solution of the present invention, the tank body and the top cover are both provided with connecting ears, and there are multiple groups of connecting ears. The top cover is connected to the tank body by bolts and nuts. A sealing gasket is provided at the bottom of the top cover. The sealing gasket matches the size of the tank body and corresponds to the position. The top cover and the tank body can be disassembled and assembled by bolts and nuts to facilitate later maintenance. The sealing gasket can seal the contact position to ensure the gas-liquid separation efficiency.

[0013] As a preferred technical solution of the present invention, a separation cover is provided at the bottom of the airway tube, and the separation cover is a frustum-shaped mesh cover that is transparent from top to bottom. The rotating shaft is provided inside the separation cover, and the separation cover can re-separate the liquid particles in the gas, enhance the gas-liquid separation effect, and improve the gas-liquid separation efficiency.

[0014] As a preferred technical solution of the present invention, a positioning block is provided at the bottom of the rotating shaft, a limiting strip parallel to the axial direction is provided between the positioning block and the bottom of the rotating shaft, a limiting groove is provided on the inner wall of the slip ring, the size of the slip ring matches that of the rotating shaft, the limiting groove matches that of the limiting strip, and the up and down movement of the slip ring does not affect the rotation, such as Figure 4 As shown, the slip ring is provided with floating blocks, which are in two groups and symmetrically arranged. The floating blocks can rise under the action of the buoyancy of the liquid, driving the slip ring to rise, so that the foam breaking net is always located on the liquid surface, ensuring the efficiency of the foam breaking net in breaking bubbles.

[0015] As a preferred technical solution of the present invention, the liquid outlet is arranged at the lowest point of the tank body, and a filter cover is provided at the connection between the liquid outlet and the tank body. The filter cover can perform a final filtration on the liquid when it flows out of the tank body to ensure that there are no bubbles and enhance the effect of removing bubbles.

[0016] The beneficial effects of the present invention are as follows: the present invention guides the movement path of the gas-liquid mixed gas through the spiral vanes, so that the gas-liquid mixed gas moves along the spiral vanes for centrifugal separation, and uses the separation plates to perform refractory separation at the same time, thereby improving separation efficiency and enhancing separation effect; the spiral vanes are inclined toward the outer edge, so that the separated liquid flows along the outer edge, reducing contact with the gas flowing at the inner edge, ensuring separation effect, and reducing the probability of bubble generation; the drainage trough and the guide plate are used to make the flow state of the liquid smooth, thereby reducing violent contact with the gas; the filter screen and the filter cover are provided on the liquid flow path, so that bubbles are eliminated throughout the process; the gas flow is used to drive the fan blades to rotate, thereby driving the foam breaking net to rotate, and the bubbles are eliminated again, which not only saves energy and improves environmental protection effect, but also improves the effect of eliminating bubbles; the filter layer is used to re-filter the gas, thereby enhancing the gas-liquid separation effect; the top cover is installed and connected with bolts that are easy to disassemble, which can improve the efficiency of later maintenance and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solution of the present invention will be described clearly and completely below with reference to the accompanying drawings. It should be noted that in the description of the present invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0018] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art; in all drawings, similar elements or parts are generally identified by similar figure marks; in the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the top cover structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the top view of the tank body of the present invention;

[0022] Figure 4 Schematic diagram of the top view of the slip ring of the present invention;

[0023] Figure 5 This is an enlarged structural diagram of point A of the present invention.

[0024] In the figure: 1. Tank body; 2. Top cover; 3. Separation plate; 4. Drainage trough; 5. Rotating shaft; 6. Slip ring; 10. Air inlet; 11. Liquid outlet; 12. Filter cover; 20. Air outlet; 21. Airway tube; 22. Bracket; 23. Filter layer; 24. Spiral leaf; 25. Separation cover; 31. Separation block; 41. Filter screen; 42. Guide plate; 50. Fan blade; 51. Limiting strip; 61. Floating block; 62. Defoaming net; 101. Connecting ear; 201. Sealing gasket; 221. Bearing. DETAILED DESCRIPTION

[0025] Example 1

[0026] like Figure 1 As shown, the present invention discloses a gas-liquid separation device capable of eliminating bubbles. The technical solution adopted is as follows: it includes a tank body 1, which is a shell with a transparent top, an air inlet 10 provided on the top of the side wall of the tank body 1, a liquid outlet 11 provided at the bottom of the tank body 1, a valve provided on the liquid outlet 11, the valve is closed and is only opened when the liquid is recovered, a separation plate 3 and a drainage groove 4 are provided on the inner side wall of the tank body 1, a filter screen 41 is provided on the drainage groove 4, and the filter screen 41 has multiple groups, a top cover 2 is provided on the top opening of the tank body 1, the top cover 2 matches the size of the tank body 1, an air outlet 20 is provided on the top of the top cover 2, an airway tube 21 is provided at the bottom of the top cover 2, the airway tube 21 is a shell that is transparent from top to bottom, and a spiral leaf 24 is provided on the outer wall of the airway tube 21. 24 can guide the gas-liquid mixed gas entering from the air inlet, so that the gas-liquid mixed gas moves in a spiral route for centrifugal separation. The bottom of the spiral leaf 24 corresponds to the top position of the drainage groove 4. A bracket 22 is provided on the inner wall of the airway tube 21. There are two groups of brackets 22. Each bracket 22 is provided with a bearing 221. The bearing 221 is provided with a rotating shaft 5. The top of the rotating shaft 5 is provided with a fan blade 50. The bottom of the rotating shaft 5 is provided with a sliding connection slip ring 6. The slip ring 6 is provided with a foam breaking net 62. There are two groups of foam breaking nets 62 and they are symmetrically arranged. The separated gas flows out from the air outlet 20, which can drive the fan blade 50, and then drive the foam breaking net 62 to rotate, thereby removing bubbles from the liquid surface at the bottom, utilizing the kinetic energy of the gas itself and reducing power consumption.

[0027] As a preferred technical solution of the present invention, there are multiple groups of separation plates 3, which are located in the intervals of the spiral leaves 24. Separation blocks 31 are provided on the separation plates 3. There are multiple groups of separation blocks 31 and they are staggered. The separation blocks 31 can fully refract and separate the gas-liquid mixture when the gas-liquid mixture passes through, thereby improving the separation efficiency and enhancing the separation effect.

[0028] As a preferred technical solution of the present invention, the drainage trough 4 includes an inner plate and a bottom plate, the inner plate is a spiral contraction structure, the bottom plate is a multi-layer spiral structure, and the bottom of the inner plate is connected to the inner edge of the bottom plate, such as Figure 2 As shown, the flow area of the drainage groove 4 is gradually increased, which can slow down the flow rate of the separated liquid and reduce the generation of bubbles.

[0029] As a preferred technical solution of the present invention, Figure 1 As shown, a guide plate 42 is provided at the bottom of the drainage groove 4. The guide plate 42 is arranged at an angle, and the guide plate 42 is inclined downward on the side close to the tank body 1. The guide plate 42 can guide the separated liquid to the inner wall of the tank body 1, so that the liquid flows to the bottom along the inner wall of the tank body 1, reducing the contact area with the gas and reducing the probability of the gas dissolving in the liquid again to produce bubbles.

[0030] As a preferred technical solution of the present invention, Figure 3 As shown, the spiral blades 24 match the inner wall size of the tank body 1, the outer sides of the spiral blades 24 are all tilted downward, and the outer edges of the spiral blades 24 are provided with sealing strips. The spiral blades 24 and the tank body 1 are combined to form a closed channel, so that the liquid separated on the separation plate 3 can flow along the outer edge of the spiral blades 24, reducing the contact with the gas flowing on the inner edge of the spiral blades 24, and improving the gas-liquid separation efficiency.

[0031] As a preferred technical solution of the present invention, a filter layer 23 is provided inside the airway tube 21. There are multiple groups of filter layers 23. The filter layers 23 can perform a final filtration on the gas to enhance the gas-liquid separation effect.

[0032] As a preferred technical solution of the present invention, connecting ears 101 are provided on both the tank body 1 and the top cover 2. There are multiple groups of connecting ears 101. The top cover 2 is connected to the tank body 1 by bolts and nuts. The disassembly method is simple and convenient, which facilitates the maintenance and replacement of later components and reduces maintenance costs. A sealing gasket 201 is provided at the bottom of the top cover 2. The sealing gasket 201 matches the size of the tank body 1 and corresponds to the position. The sealing gasket 201 seals the contact position between the tank body 1 and the top cover 2 to improve air tightness, prevent gas leakage, and ensure the gas-liquid separation effect.

[0033] As a preferred technical solution of the present invention, a separation cover 25 is provided at the bottom of the airway tube 21. The separation cover 25 is a frustum-shaped mesh cover that is transparent from top to bottom. A rotating shaft 5 is provided inside the separation cover 25. The separation cover 25 separates the gas after the initial separation again, thereby enhancing the separation effect and improving the separation efficiency.

[0034] like Figure 5As shown, as a preferred technical solution of the present invention, a positioning block is provided at the bottom of the rotating shaft 5, and a limiting strip 51 parallel to the axial direction is provided between the positioning block and the bottom of the rotating shaft 5, and a limiting groove is provided on the inner wall of the slip ring 6. The size of the slip ring 6 matches that of the rotating shaft 5, and the limiting groove matches the size of the limiting strip 51. A floating block 61 is provided on the slip ring 6, and there are two groups of floating blocks 61 that are symmetrically arranged. The slip ring 6 can be raised and lowered while rotating with the rotating shaft 5, and the floating block 61 can be lifted by the buoyancy of the slip ring 6, so that the foam breaking net 62 is always located on the liquid surface, thereby ensuring the continuity of the operation of the foam breaking net 62 and enhancing the effect of eliminating bubbles.

[0035] As a preferred technical solution of the present invention, the liquid outlet 11 is arranged at the lowest point of the tank body 1, and a filter cover 12 is provided at the connection between the liquid outlet 11 and the tank body 1. The filter cover 12 can perform the final bubble elimination filtration on the separated liquid to ensure the effect of removing bubbles.

[0036] The working principle of the present invention is as follows: the mixed gas enters the tank body 1 from the air inlet 10, and then spirals downward along the spiral vanes 24 around the outer wall of the airway tube 21. Under the action of centrifugal force, the liquid particles are closer to the inner wall of the tank body 1. When passing through the separation plate 3, they are blocked by the separation block 31. The liquid particles gather on the separation plate 3 to form liquid, and flow onto the spiral vanes 24, flow down along the spiral vanes 24 and the inner wall of the tank body 1, and then fall on the drainage groove 4, continue to flow along the drainage groove 4, pass through multiple filters 41, filter out the bubbles formed, and finally guide through the guide plate 42. The liquid flows through the inner wall of the tank body 1 to the bottom of the tank body 1. At this time, the valve is closed and the liquid gathers at the bottom of the tank body 1. In this process, the air flow flows along the spiral vanes 24, and then enters the airway tube 21 after passing through the separation cover 25. The liquid particles therein are blocked and separated by the separation cover 25 again, and fall to the bottom of the tank body 1 after gathering. , then the air flow enters the airway pipe 21, passes through the bracket 22, drives the fan blade 50 to rotate, and the fan blade 50 drives the rotating shaft 5 on the bearing 221 to rotate, drives the slip ring 6 to rotate, and the gas then passes through the filter layer 23 and is blown out from the air outlet 20 on the top cover 2 to complete the gas-liquid separation, and the slip ring 6 drives the foam breaking net 62 to rotate. When the foam breaking net 62 rotates, it stirs the liquid at the bottom of the tank body 1 and breaks up possible bubbles therein. When the liquid level rises, the liquid lifts the floating block 61, and the slip ring 6 rises along the limit bar 51 during rotation, so that the foam breaking net 62 always stirs on the surface of the liquid to break up the bubbles; when collecting the liquid, the valve is opened, and the liquid is filtered again by the filter cover 12 and flows out from the liquid outlet 11; when maintenance is needed, the bolts on the connecting ear 101 can be removed, the top cover 2 can be removed from the tank body 1, and the inside of the tank body 1 can be maintained. The sealing gasket 201 seals the tank body 1 and the top cover 2.

[0037] The circuit connection involved in the present invention is a common method used by those skilled in the art, and technical inspiration can be obtained through limited experiments, which is common knowledge.

[0038] Components not described in detail herein are prior art.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Although the specific embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by ordinary technicians in this field, various changes can be made without departing from the purpose of the present invention. Modifications or deformations that do not involve creative work are still within the scope of protection of the present invention.

Claims

1. A gas-liquid separation device capable of eliminating bubbles, characterized by: The invention comprises a tank body (1), wherein the tank body (1) is a shell with a transparent top, an air inlet (10) is provided on the top of the side wall of the tank body (1), a liquid outlet (11) is provided on the bottom of the tank body (1), a valve is provided on the liquid outlet (11), a separation plate (3) and a drainage groove (4) are provided on the inner side wall of the tank body (1), a filter screen (41) is provided on the drainage groove (4), and the filter screen (41) has multiple groups, and a filter screen (41) is provided on the top of the tank body (1). A top cover (2) is provided, wherein the size of the top cover (2) matches that of the tank body (1), an air outlet (20) is provided at the top of the top cover (2), an airway tube (21) is provided at the bottom of the top cover (2), the airway tube (21) is a shell body that is transparent from top to bottom, a spiral sheet (24) is provided on the outer wall of the airway tube (21), the bottom of the spiral sheet (24) corresponds to the top position of the drainage groove (4), and the inner wall of the airway tube (21) is provided with a spiral sheet (24). A bracket (22) is provided, the bracket (22) has two groups, the brackets (22) are both provided with bearings (221), the bearings (221) are provided with a rotating shaft (5), the top of the rotating shaft (5) is provided with a fan blade (50), the bottom of the rotating shaft (5) is provided with a sliding ring (6) for sliding connection, the sliding ring (6) is provided with a foam breaking net (62), the foam breaking net (62) has multiple groups and is symmetrically arranged; the separation plate (3) has multiple groups, the separation plate (3) is provided with a separation block (31), and the separation blocks (31) are in multiple groups and arranged in a staggered manner; the drainage trough (4) includes an inner plate and a bottom plate, the inner plate is a spiral contraction structure, and the bottom plate is a multi-layer spiral structure, and the bottom of the inner plate is connected to the inner edge of the bottom plate; the bottom of the drainage trough (4) is provided with a guide plate (42), and the guide plate (42) is tilted, and the guide plate (42) is tilted downward on the side close to the tank body (1).

2. A gas-liquid separation device capable of eliminating bubbles according to claim 1, characterized in that: The spiral blades (24) match the inner wall size of the tank body (1), the outer sides of the spiral blades (24) are all inclined downward, and the outer edges of the spiral blades (24) are provided with sealing strips.

3. The gas-liquid separation device capable of eliminating bubbles according to claim 1, characterized in that: A filter layer (23) is provided inside the airway tube (21), and the filter layer (23) comprises multiple groups.

4. The gas-liquid separation device capable of eliminating bubbles according to claim 1, characterized in that: The tank body (1) and the top cover (2) are both provided with connecting ears (101), and there are multiple groups of connecting ears (101). The top cover (2) is connected to the tank body (1) through bolts and nuts. A sealing gasket (201) is provided at the bottom of the top cover (2), and the sealing gasket (201) matches the size of the tank body (1) and corresponds to the position.

5. The gas-liquid separation device capable of eliminating bubbles according to claim 1, characterized in that: A separation cover (25) is provided at the bottom of the airway tube (21). The separation cover (25) is a frustum-shaped mesh cover that is transparent from top to bottom. The rotating shaft (5) is provided inside the separation cover (25).

6. The gas-liquid separation device capable of eliminating bubbles according to claim 1, characterized in that: A positioning block is provided at the bottom of the rotating shaft (5), and a limiting strip (51) parallel to the axial direction is provided between the positioning block and the bottom of the rotating shaft (5). A limiting groove is provided on the inner wall of the slip ring (6). The size of the slip ring (6) matches that of the rotating shaft (5), and the limiting groove matches that of the limiting strip (51). The slip ring (6) is provided with floating blocks (61), and the floating blocks (61) have two groups and are symmetrically arranged.

7. The gas-liquid separation device capable of eliminating bubbles according to claim 1, characterized in that: The liquid outlet (11) is provided at the lowest point of the tank body (1), and a filter cover (12) is provided at the connection between the liquid outlet (11) and the tank body (1).

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