A sound attenuating plenum chamber for an air supply system

Abstract

The application relates to the field of air supply noise reduction equipment, in particular to a sound attenuation static pressure tank for an air supply system which is convenient to install and which comprises a tank body, a connecting head and a connecting block and the like; one connecting head is connected to each of two adjacent vertical surfaces of the tank body; and the bottom of the connecting head is provided with a plurality of connecting blocks which are fixedly connected in a square distribution. The application realizes the connection of the connecting head and the ventilation pipeline by the separated tank body and the connecting head, avoids the situation that the tank body is too close to the wall, the space is insufficient and the connecting head and the ventilation pipeline are inconvenient to connect, realizes the butt joint of the connecting block, the corresponding horizontal sliding groove and the vertical sliding groove, the tank body can only move along the same straight line direction where the connecting head and the communicating opening are located, only needs to be referenced and aligned from one direction, avoids the situation that the butt joint condition is observed from each direction angle, some positions are blocked by the large-volume static pressure tank, the observation is inconvenient, the butt joint difficulty of the static pressure tank and the pipeline is high, the precision is poor, the static pressure tank needs to be moved for many times and the installation efficiency is low.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air supply noise reduction equipment, in particular to a sound attenuation static pressure tank for air supply system which is convenient to install. BACKGROUND

[0002] The static pressure tank is a device for converting the dynamic pressure generated by the fan in the air supply system into static pressure, which is usually connected between two pipes to achieve the effect of noise reduction and noise reduction. As a connecting piece between pipes, the static pressure tank is usually installed near the wall to reduce space occupation and improve aesthetics. When the static pressure tank is too close to the wall, it is not convenient for workers to use tools to install and connect the static pressure tank and the pipe. Moreover, the existing static pressure tank for air supply system is usually large in size, and during installation, it needs to be lifted by lifting equipment, and the docking condition is checked by viewing in all directions. However, some positions are blocked by the large static pressure tank, making it difficult to observe, and the static pressure tank and the pipe are difficult to dock with poor precision, requiring multiple movements of the static pressure tank, resulting in low installation efficiency. SUMMARY

[0003] In order to overcome the shortcomings that when the large static pressure tank is installed too close to the wall, it is not convenient for workers to observe and use tools to connect the static pressure tank and the pipe, the present application provides a sound attenuation static pressure tank for air supply system which is convenient to install.

[0004] Technical scheme: a sound attenuation static pressure tank for air supply system which is convenient to install, comprising a tank body; a noise reduction structure is arranged in the tank body; further comprising a connecting head, a connecting block and a sealing assembly; the tank body is connected with one connecting head on each of the two adjacent vertical surfaces; the connecting head is square; the longitudinal section of the connecting head is inverted L-shaped, and the horizontal edge faces the center of the connecting head; a plurality of horizontal sliding grooves and a plurality of vertical sliding grooves are formed on the surface of the tank body where the connecting head is arranged; the distance between adjacent horizontal sliding grooves is equal to the length of the side of the square connecting head; the distance between adjacent vertical sliding grooves is equal to the length of the side of the square connecting head; a communication port is formed on the tank body; the communication port is smaller than the inner diameter of the connecting head; a plurality of connecting blocks are arranged in square distribution at the bottom of the connecting head; a sealing assembly is connected to the connecting head for sealing the bottom of the connecting head.

[0005] Further illustrate, the closed assembly includes elastic piece one, connecting frame, blocking piece, blocking plate and rotating rod; The connecting head is internally provided with a downwardly penetrating square sliding groove one; The connecting head is internally fixedly connected with a group of four elastic pieces one; The sliding groove one is internally slidably connected with a square connecting frame; All the elastic pieces one are fixedly connected with the upper surface of the connecting frame; The connecting frame is fixedly connected with an L-shaped blocking piece at each corner; One blocking plate is connected between adjacent blocking pieces; All the blocking pieces and the blocking plate are combined to form a square; The opposite surfaces of the two opposite blocking plates are each provided with a plurality of avoiding grooves two; The connecting head is rotatably connected with two rotating rods through torsion springs; The rotating rods are extended outside the connecting head at both ends; A plurality of locking blocks are fixedly connected on each rotating rod; The locking blocks are extended into the corresponding avoiding grooves two; A plurality of avoiding grooves one are formed in the connecting head; The avoiding grooves one are in communication with adjacent avoiding grooves two; A sliding groove two is formed in each connecting block; The sliding groove two is in communication with the sliding groove one.

[0006] Further illustrate, the blocking plate is slidably connected with the adjacent blocking piece; The connecting frame is fixedly connected with the corresponding blocking piece at each corner; The connecting frame is fixedly connected with the corresponding blocking plate at each side; A limiting groove is formed in the adjacent surface of the blocking piece and the blocking plate; A pair of limiting blocks are fixedly connected on each blocking plate; The limiting blocks are slidably connected with the adjacent limiting grooves; The limiting blocks and the limiting groove top wall are connected with elastic pieces two.

[0007] Further illustrate, the connecting block is inverted T-shaped; The horizontal sliding groove and the vertical sliding groove are inverted T-shaped in vertical section.

[0008] Further illustrate, the connecting head is provided with a sealing gasket on the contact surface with the ventilation pipeline.

[0009] Further illustrate, the connecting block is of smooth surface and metal material.

[0010] Further illustrate, the blocking piece and the blocking plate are each provided with a rubber layer at the bottom.

[0011] Further illustrate, the rotating rod is provided with a rubber sleeve at both ends.

[0012] Further illustrate, the box body is of aluminum alloy material.

[0013] Further illustrate, further comprising a filter screen; An L-shaped block is fixedly connected at each corner in the connecting head; The filter screen is fixedly connected on all the L-shaped blocks; The filter screen is a dense-pored nylon screen.

[0014] The beneficial effects of the present application are: the present application realizes the connection of the connecting head and the ventilation pipeline through the separate box body and the connecting head, avoids the insufficient space caused by the too close box body to the wall, and facilitates the connection of the connecting head and the ventilation pipeline;

[0015] By connecting the block and the corresponding transverse sliding groove and longitudinal sliding groove, the box can only move along the same straight line direction where the connecting head and the communication port are located at this time, only needs to be aligned from one direction, avoids viewing the butt joint condition from each direction angle, some positions are blocked by the large volume static pressure box, is inconvenient to observe, makes the static pressure box and the pipeline butt joint difficult, poor precision, and needs to move the static pressure box many times, and the installation efficiency is low;

[0016] By the transverse sliding groove and the longitudinal sliding groove, the movable direction of the box and the connecting head is limited, then the ventilation pipeline and the aligned connecting head are used as a relative reference, the accurate position of the communication port on the surface of the box is obtained, the existing problems that one data error leads to the deviation of the opening position of the communication port and the failure of successful butt joint of the ventilation pipeline are avoided, and the static pressure box is scrapped.

[0017] By the filter screen arranged in the connecting head, sundries is blocked from entering the box, and the noise reduction effect of the noise reduction structure in the box is affected. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a three-dimensional structure schematic view of the static pressure box connected with the ventilation pipeline;

[0019] Figure 2 It is a three-dimensional structure schematic view of the static pressure box connected with the ventilation pipeline;

[0020] Figure 3 It is an explosion view of the box and the connecting head combination;

[0021] Figure 4 It is a three-dimensional structure schematic view of the connecting head, the connecting block, the rotating rod and the filter screen combination;

[0022] Figure 5 It is a three-dimensional structure schematic view of the connecting head, the connecting block and the sealing assembly combination;

[0023] Figure 6 It is an explosion view of the connecting head, the connecting block and the sealing assembly combination;

[0024] Figure 7 It is a three-dimensional structure schematic view of the elastic piece one, the connecting frame, the plugging block and the plugging plate combination;

[0025] Figure 8 It is a sectional view of the plugging block;

[0026] Figure 9 It is a three-dimensional structure schematic view of the plugging block and the plugging plate combination;

[0027] Figure 10This is a three-dimensional structural diagram of the connector, connecting block, connecting frame, sealing plate and rotating rod assembly of the present invention;

[0028] Figure 11 This is a side view of the connector, connecting block, connecting frame, sealing plate, and rotating rod assembly of the present invention;

[0029] Figure 12 This is a three-dimensional structural diagram of the housing and connector assembly of the present invention;

[0030] Figure 13 For the present invention Figure 12 Enlarged view of point A in the middle;

[0031] Figure 14 This is a three-dimensional structural diagram of the connector, connecting frame, sealing block and L-shaped block combination of the present invention.

[0032] In the attached diagrams: 1-box body, 101-horizontal slide groove, 102-longitudinal slide groove, 103-connecting port, 2-connector, 201-slide groove one, 202-avoidance groove one, 3-connecting block, 301-slide groove two, 4-elastic element one, 5-connecting frame, 6-blocking block, 601-limiting groove, 7-blocking plate, 701-avoidance groove two, 702-limiting block, 703-elastic element two, 8-rotating rod, 801-locking block, 9-filter screen, 901-L-shaped block, 001-ventilation duct. Detailed Implementation

[0033] The invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art.

[0034] Example 1

[0035] like Figures 1-13 As shown, a silencer static pressure box for an easy-to-install air supply system includes a box body 1; a noise reduction structure is provided inside the box body 1.

[0036] It also includes the connecting head 2, the connecting block 3 and the closing assembly; the box body 1 is connected with one connecting head 2 on each of the two adjacent vertical surfaces; the connecting head 2 is square; the longitudinal section of the connecting head 2 is inverted L-shaped, and the horizontal edge faces the center of the connecting head 2; the surface of the box body 1 provided with the connecting head 2 is provided with five horizontal sliding grooves 101 and five vertical sliding grooves 102; the distance between the adjacent horizontal sliding grooves 101 is equal to the length of the side of the square connecting head 2; the distance between the adjacent vertical sliding grooves 102 is equal to the length of the side of the square connecting head 2; the box body 1 is provided with a communication port 103; the communication port 103 is smaller than the inner diameter of the connecting head 2; the bottom of the connecting head 2 is square and is welded with four connecting blocks 3; each connecting block 3 is located at the center of the bottom of the corresponding side of the connecting head 2; the connecting head 2 is connected with the closing assembly.

[0037] The closing assembly includes elastic members 4, a connecting frame 5, blocking blocks 6, blocking plates 7 and rotating rods 8; the connecting head 2 is provided with a downward penetrating square sliding groove 201; the connecting head 2 is fixedly connected with four elastic members 4; the elastic members 4 are springs; the sliding groove 201 is slidably connected with a square connecting frame 5; all the elastic members 4 are fixedly connected with the upper surface of the connecting frame 5; the four corners of the connecting frame 5 are each welded with an L-shaped blocking block 6; the adjacent blocking blocks 6 are connected with a blocking plate 7; all the blocking blocks 6 and the blocking plates 7 are combined to form a square; the opposite surfaces of the two opposite blocking plates 7 are each provided with two avoiding grooves 701; the connecting head 2 is rotatably connected with two rotating rods 8 through torsion springs; the two ends of the rotating rods 8 extend outside the connecting head 2; each rotating rod 8 is welded with two locking blocks 801; the locking blocks 801 extend into the corresponding avoiding grooves 701; the connecting head 2 is provided with a plurality of avoiding grooves 202; the avoiding grooves 202 are communicated with the adjacent avoiding grooves 701; each connecting block 3 is provided with a sliding groove 301; the sliding groove 301 is communicated with the sliding groove 201.

[0038] The blocking plate 7 is slidably connected with the adjacent blocking block 6; the four corners of the connecting frame 5 are welded with the corresponding blocking blocks 6; the four edges of the connecting frame 5 are welded with the corresponding blocking plates 7; the adjacent surfaces of the blocking block 6 and the blocking plate 7 are each provided with a limiting groove 601; each blocking plate 7 is welded with a pair of limiting blocks 702; the limiting blocks 702 are slidably connected with the adjacent limiting grooves 601; the limiting blocks 702 and the top wall of the limiting groove 601 are connected with elastic members 703; the elastic members 703 are springs.

[0039] The connecting block 3 is inverted T-shaped; the horizontal sliding groove 101 and the vertical sliding groove 102 are inverted T-shaped in longitudinal section; the stability of the connecting block 3 and the horizontal sliding groove 101 or the vertical sliding groove 102 is ensured.

[0040] The contact surface between the connecting head 2 and the ventilation pipeline 001 is provided with a sealing gasket; the sealing property of the connection between the connecting head 2 and the ventilation pipeline 001 is ensured.

[0041] The connecting block 3 is made of metal with smooth surface, which reduces friction resistance and prolongs service life.

[0042] The blocking block 6 and the bottom of the blocking plate 7 are provided with rubber layers, which ensure sealing.

[0043] The two ends of the rotating rod 8 are provided with rubber sleeves, which increase friction and prevent slipping when workers hold the rotating rod 8.

[0044] The box body 1 is made of aluminum alloy, which has high strength and light weight.

[0045] The static pressure tank is usually installed near the wall as a connecting device between pipelines, which reduces space occupation and improves aesthetics. When the static pressure tank is too close to the wall, it is not convenient for workers to use tools to connect the static pressure tank and the pipeline. Moreover, the existing air supply system static pressure tank usually has a large volume, and during installation, it needs to be lifted by lifting equipment, and the docking situation is checked by viewing from different directions. However, some positions are blocked by the large-volume static pressure tank, which makes it difficult to observe, and the static pressure tank and the pipeline are difficult to connect with poor precision, which requires multiple movements of the static pressure tank and low installation efficiency.

[0046] To solve the above problems, the application provides a sound-attenuating static pressure tank for an air supply system.

[0047] When installing the application, first, the box body 1 and the two connecting heads 2 are in a separated state. The worker first fixes the two connecting heads 2 with the corresponding ventilation pipelines 001. The installation process is as follows: Figure 1 As shown in the figure, the worker contacts the upper surface of the connecting head 2 with the bottom surface of the ventilation pipeline 001, and the horizontal edge of the connecting head 2 with longitudinal section is inverted L-shaped, which extends inward. At this time, the horizontal edge of the connecting head 2 has the same coverage area as the lower surface of the outer edge of the ventilation pipeline 001. Then, the worker inserts the tool and connecting bolts from the bottom into the inside of the connecting head 2, and fixes the horizontal edge of the connecting head 2 and the outer edge of the ventilation pipeline 001 by the bolts from the inside of the connecting head 2. In this way, the existing connection method is changed from connecting the connecting head 2 outside with the ventilation pipeline 001 to connecting the tool inside the connecting head 2 with the ventilation pipeline 001, which avoids the situation that the worker has insufficient space to use the tool when one side of the connecting head 2 is too close to the wall during installation, and the wall blocks the worker from connecting the connecting head 2 and the ventilation pipeline 001;

[0048] After the two connecting heads 2 are connected with the corresponding ventilation pipes 001, the box 1 and the two connecting heads 2 are connected, and the installation process is as follows: on the side with sufficient space, the box 1 is lifted by means of a lifting tool, at this time, the communication port 103 is located in the middle of the corresponding surface of the box 1, for example, the worker moves the box 1 by means of the lifting tool, aligns the corresponding horizontal sliding groove 101 and the vertical sliding groove 102 on the surface of the box 1 with the connecting blocks 3 at the bottom of the connecting head 2, so that the two connecting heads 2 and the corresponding communication ports 103 are located on the same straight line, then the box 1 is pushed towards the connecting head 2, so that the connecting blocks 3 are connected with the corresponding horizontal sliding groove 101 and the vertical sliding groove 102, at this time, the box 1 can only move along the same straight line where the connecting head 2 and the communication port 103 are located, only one direction needs to be aligned, and the connection condition is observed from the angle of each direction, the position is blocked by the large-volume static pressure box, and it is inconvenient to observe, so that the static pressure box and the pipe are difficult to connect, the precision is poor, and the static pressure box needs to be moved many times, and the installation efficiency is low; until the box 1 is moved to align the corresponding connecting head 2 and the communication port 103, the box 1 is installed in place, then the worker fixes the box 1 in the current position to complete the installation of the application, and then the worker starts the air supply system, so that the application can be normally used.

[0049] In actual installation, the relative positions of the two ventilation pipes 001 may deviate due to the installation space, and then the communication positions of the ventilation pipes 001 and the box 1 are not necessarily located in the middle of the surface of the box 1, and the communication port 103 can be opened at any position on the surface, the existing box 1 is in a completely closed state after production, according to the positions of the two ventilation pipes 001 on the site, a series of data of the installation position of the box 1 are measured and calculated, and then the communication port 103 is opened on the surface of the box 1, but this method needs to measure multiple groups of data, and as long as one data is wrong, the opening position of the communication port 103 will deviate, the deviated communication port 103 cannot be successfully connected with the ventilation pipe 001, and the static pressure box is scrapped.

[0050] Further, the surface of the box 1 is provided with a plurality of adjacent distance square connector 2 side length length ratio reduction transverse chute 101 and longitudinal chute 102; the initial state of the box 1 is completely sealed state, no opening port 103 is set, the connector 2 and the box 1 inside are not communicated; when the connector 2 is connected with the corresponding ventilation pipeline 001, the worker lifts the unopened box 1 by lifting tool, selects the appropriate transverse chute 101 and longitudinal chute 102 and connects with the connector 2 (the appropriate transverse chute 101 and longitudinal chute 102 refer to that when the box 1 is moved relative to the connector 2, the moving route of the box 1 is not blocked by surrounding objects), then the box 1 is moved relative to the connector 2, the connecting block 3 slides in the corresponding transverse chute 101 and longitudinal chute 102, thereby the box 1 selects the appropriate installation position, at this time the box 1 and the connector 2 are in the connected state, when the box 1 determines the appropriate position, the relative position of the box 1 and the connector 2 can also be determined, then the worker makes a mark on the surface of the box 1 along the outer edge of the connector 2 by a marker, then disconnects the box 1 and the connector 2 and removes the opening port 103 smaller than the inner diameter of the connector 2 on the surface of the box 1 at the corresponding position according to the mark, then reconnects the box 1 and the connector 2, aligns the opening port 103 and the connector 2, realizes the perfect communication of the opening port 103 and the connector 2; thereby limiting the relative movable direction of the box 1 and the connector 2 when connected through the transverse chute 101 and the longitudinal chute 102, avoiding the box 1 from deviating from all directions when connected with the connector 2, and then through the ventilation pipeline 001 and the aligned connector 2 as a relative reference, the accurate position of the opening port 103 on the surface of the box 1 is obtained, avoiding the existing problem that a data error will cause the opening position of the opening port 103 to deviate, which cannot be successfully connected with the ventilation pipeline 001, resulting in the static pressure tank being scrapped.

[0051] As shown in FIG. 1, Figure 12 the transverse chute 101 or the longitudinal chute 102 will be communicated with the opening port 103, and the transverse chute 101 and the longitudinal chute 102 are extended outside the connector 2, thereby making the opening port 103 communicated with the outside of the connector 2, and there is a risk of gas leakage, thereby, as shown in FIG. 2, Figure 11 the initial state, the rotating rod 8 is limited by the torsion spring, so that the locking block 801 is in a horizontal state and extends in the avoiding groove two 701, the upper surface of the locking block 801 is in contact with the lower surface of the connecting frame 5, the elastic member one 4 is compressed, and the connecting frame 5, the plugging block 6 and the plugging plate 7 are limited in the chute one 201, when the box 1 and the connector 2 are communicated, as shown in FIG. 3, Figure 11For the direction reference, the worker holds the part of the rotating rod 8 extending outside the connector 2, rotates the rotating rod 8 clockwise, the rotating rod 8 compresses the torsion spring, the rotating rod 8 drives the locking block 801 to rotate clockwise and is stored in the avoiding groove one 202, and then the restriction on the lower surface of the connecting frame 5 is released. At this time, the elastic member one 4 is stretched, pushes the connecting frame 5, the blocking block 6 and the blocking plate 7 to move downward and extend out of the sliding groove one 201. After the connecting frame 5 is set to move downward beyond the locking block 801, the torsion spring of the rotating rod 8 is reset, drives the rotating rod 8 and the locking block 801 to rotate counterclockwise to return to the horizontal state. In the process, the blocking plate 7 moves downward from the sliding groove two 301 corresponding to the connecting block 3, until the bottom of the blocking block 6 and the blocking plate 7 contacts with the bottom surface of the corresponding horizontal sliding groove 101 and the vertical sliding groove 102, and then the horizontal sliding groove 101 and the vertical sliding groove 102 are closed, avoiding the horizontal sliding groove 101 and the vertical sliding groove 102 to communicate with the communication port 103 and the outside to cause air leakage.

[0052] Further, since the communication port 103 is not necessarily opened in the middle of the box body 1, the four edges of the connector 2 do not necessarily correspond to one horizontal sliding groove 101 and one vertical sliding groove 102. Therefore, when the connecting frame 5 pushes the blocking block 6 and the blocking plate 7 to descend to close the horizontal sliding groove 101 and the vertical sliding groove 102, there are two oppositely arranged blocking plates 7 that are not aligned with the horizontal sliding groove 101 or the vertical sliding groove 102. In the process of descending, the pair of blocking plates 7 that are not aligned with the horizontal sliding groove 101 or the vertical sliding groove 102 will contact with the upper surface of the box body 1. At this time, the stretching force of the elastic member one 4 is greater than the stretching force of the elastic member two 703, and then the elastic member one 4 will continue to push the connecting frame 5, the blocking block 6 and the blocking plate 7 to descend, while the pair of blocking plates 7 contacting with the upper surface of the box body 1 will be blocked and cannot move downward. At this time, the limiting block 702 on the pair of blocking plates 7 will slide along the limiting groove 601, and the corresponding elastic member two 703 will be compressed. The edge of the pair of blocking plates 7 and the corresponding connecting frame 5 will remain at the current height, while the other pair of limiting blocks 702 aligned with the horizontal sliding groove 101 or the vertical sliding groove 102 will move downward with the blocking block 6 to block the horizontal sliding groove 101 or the vertical sliding groove 102. It should be noted that at this time, the middle of the limiting block 702 which does not descend corresponds to a horizontal sliding groove 101 or a vertical sliding groove 102, which will be in communication with the outside, but at this time, the horizontal sliding groove 101 or the vertical sliding groove 102 is located in the middle of the limiting block 702, and the relative position of the corresponding connecting block 3 is also aligned with the middle of the limiting block 702. Therefore, the connecting block 3 will be located in the horizontal sliding groove 101 or the vertical sliding groove 102 to close it, so that it cannot communicate with the outside.

[0053] It should be noted that the cross section of the blocking block 6 is L-shaped, and the relative movement of the box body 1 is a step movement along the horizontal sliding groove 101 and the vertical sliding groove 102. Therefore, whether all the blocking plates 7 are aligned with the horizontal sliding groove 101 or the vertical sliding groove 102, the blocking block 6 can descend to block the horizontal sliding groove 101 or the vertical sliding groove 102.

[0054] Embodiment 2

[0055] On the basis of embodiment 1, as shown in Figures 4-6 and Figure 14 It also includes filter screen 9; L-shaped block 901 is welded in each corner of connecting head 2; all L-shaped blocks 901 are commonly fixed with filter screen 9; filter screen 9 is dense-pored nylon screen.

[0056] In use, part of impurities in ventilation duct 001 are easy to enter into box body 1 along with air, which affects the noise reduction effect of noise reduction structure in box body 1, thus filter screen 9 is arranged in connecting head 2 to block the impurities from entering into box body 1.

[0057] Although the present application has been described with reference to the example embodiments, it is to be understood that the application is not limited to the disclosed example embodiments. The scope of the following claims is to be accorded the widest patent protection legally permissible, corresponding to the language in the claims.

Claims

1. A silencing static pressure tank for air supply system which is convenient to install, comprising a tank body (1), a noise reduction structure is arranged in the tank body (1), characterized in that: It also includes the connecting head (2), connecting block (3) and closure assembly; the box (1) is connected with one connecting head (2) on each of the two adjacent vertical surfaces respectively; the connecting head (2) is square; the longitudinal section of the connecting head (2) is inverted L-shaped, and the horizontal edge faces the center of the connecting head (2); the surface of the box (1) provided with the connecting head (2) is provided with a plurality of horizontal sliding grooves (101) and a plurality of vertical sliding grooves (102); the distance between adjacent horizontal sliding grooves (101) is equal to the length of the square connecting head (2) edge length; the distance between adjacent vertical sliding grooves (102) is equal to the length of the square connecting head (2) edge length; the box (1) is provided with a communication port (103); the communication port (103) is smaller than the inner diameter of the connecting head (2); the bottom of the connecting head (2) is fixedly connected with a plurality of connecting blocks (3) in square distribution; the connecting head (2) is connected with a closure assembly for closing the bottom of the connecting head (2).

2. A sound attenuating plenum chamber for an air supply system according to claim 1, wherein: The closure assembly comprises elastic members (4), a connecting frame (5), a blocking block (6), a blocking plate (7) and a rotating rod (8); a square sliding groove (201) is formed in the connecting head (2) and extends downward; a group of four elastic members (4) are fixedly connected in the connecting head (2); a square connecting frame (5) is slidably connected in the sliding groove (201); all the elastic members (4) are fixedly connected with the upper surface of the connecting frame (5); an L-shaped blocking block (6) is fixedly connected to each corner of the connecting frame (5); a blocking plate (7) is connected between adjacent blocking blocks (6); all the blocking blocks (6) and the blocking plate (7) are combined to form a square; a plurality of avoiding grooves (701) are formed in the opposite surfaces of the two opposite blocking plates (7); two rotating rods (8) are rotatably connected to the connecting head (2) by torsion springs; the two ends of the rotating rod (8) extend outside the connecting head (2); a plurality of locking blocks (801) are fixedly connected to each rotating rod (8); the locking blocks (801) extend into the corresponding avoiding grooves (701); a plurality of avoiding grooves (202) are formed in the connecting head (2); the avoiding grooves (202) are in communication with the adjacent avoiding grooves (701); a sliding groove (301) is formed in each connecting block (3); the sliding groove (301) is in communication with the sliding groove (201).

3. A sound attenuating plenum chamber for an air supply system according to claim 2, wherein: The blocking plate (7) is slidably connected with the adjacent blocking block (6); the four corners of the connecting frame (5) are fixedly connected with the corresponding blocking blocks (6); the four edges of the connecting frame (5) are fixedly connected with the corresponding blocking plates (7); a limiting groove (601) is formed in each adjacent surface of the blocking block (6) and the blocking plate (7); a pair of limiting blocks (702) are fixedly connected to each blocking plate (7); the limiting blocks (702) are slidably connected with the adjacent limiting grooves (601); the limiting blocks (702) and the top wall of the limiting groove (601) are connected by elastic members (703).

4. The acoustically quietened pressure tank for an air supply system of claim 1, wherein: The connecting block (3) is inverted T-shaped; the horizontal sliding groove (101) and the vertical sliding groove (102) are inverted T-shaped in longitudinal section.

5. The acoustically quietened pressure tank for an air supply system of claim 1, wherein: The connecting head (2) is provided with a sealing gasket on the contact surface of the ventilation duct (001).

6. A sound attenuating plenum chamber for an air supply system according to claim 4, wherein: The connecting block (3) is made of smooth metal material.

7. A sound attenuating plenum chamber for an air supply system according to claim 2, wherein: The bottom of the blocking block (6) and the blocking plate (7) is provided with a rubber layer.

8. A sound attenuating plenum chamber for an air supply system according to claim 7, wherein: The both ends of the rotating rod (8) are provided with rubber sleeves.

9. A sound attenuating plenum chamber for an air supply system according to claim 1, wherein: The box (1) is made of aluminum alloy.

10. A sound attenuating plenum chamber for an air supply system according to claim 9, wherein: It also comprises a filter screen (9); one L-shaped block (901) is fixedly connected to each corner in the connecting head (2); all the L-shaped blocks (901) are commonly fixedly connected with the filter screen (9); the filter screen (9) is a dense-pored nylon screen.

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