Air compression equipment for low-noise closed space

Abstract

The utility model discloses low-noise air compression equipment for a closed space, which comprises a case, a compressor is arranged in the case, the compressor is used for compressing air, an air inlet pipe used for air inlet of the compressor is arranged on one side of the case, and an air outlet pipe used for air outlet of the compressor is arranged on the other side of the case; a noise reduction component for reducing the noise of the compressor is arranged in the case; a cooling air duct is arranged in the compressor and comprises a lower air inlet arranged on the lower side of the machine box and an upper air outlet arranged on the upper side of the machine box. The lower air inlet and the upper air outlet are both in an S shape and flow through the compressor from bottom to top, and the transmission direction of noise is changed. A damping device is arranged at the joint of the bottom of the compressor and the case; the noise generated by the air compression equipment is reduced, so that the air compression equipment is quieter in use, is suitable for a closed space, and does not cause bad user experience.

Description

Technical Field

[0001] This utility model relates to the field of air compression equipment technology, and in particular to a low-noise air compression equipment for use in enclosed spaces. Background Technology

[0002] An air compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas. Air compressors are similar in structure to water pumps. Most compressors are reciprocating pistons, rotary vanes, or rotary screws. The compressor is the main body of the air source device. It is a device that converts the mechanical energy of the prime mover (usually an electric motor) into gas pressure energy. It is a compressed air pressure generating device.

[0003] Because the pump assembly in an air compressor is connected to the motor rotor assembly and the compressor housing assembly, when the pump assembly is working, it receives a large amount of energy from the motor and transmitted to the housing. As a result, its own modes are excited, and the resulting vibrations are highly transmissible and radiate outward through the gas channel, causing significant noise. Therefore, it is necessary to improve the air intake structure, air outlet structure, and installation structure of the air compressor to reduce noise, making it quieter during use and suitable for enclosed spaces, thus avoiding a poor user experience. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology in terms of high noise levels and to provide a low-noise air compression device for enclosed spaces. This reduces the noise generated by the air compression device, making it quieter to use and suitable for enclosed spaces, thus avoiding a poor user experience.

[0005] To achieve the above objectives, this utility model provides a low-noise air compression device for enclosed spaces, including a chassis. A compressor is installed inside the chassis for compressing air. An air inlet pipe is installed on one side of the chassis for the compressor to enter, and an air outlet pipe is installed on the other side for the compressor to exit. Noise reduction components are installed inside the chassis to reduce compressor noise. A cooling air duct is installed inside the compressor, including a lower air inlet installed on the lower side of the chassis and an upper air outlet installed on the upper side of the chassis. Both the lower air inlet and the upper air outlet are S-shaped, flowing from bottom to top through the compressor to change the direction of noise propagation. A shock-absorbing device is installed at the connection between the bottom of the compressor and the chassis.

[0006] Preferably, the noise reduction component is sound-absorbing cotton installed on the inner wall of the chassis. The sound-absorbing cotton disperses the compressor noise and keeps it inside the chassis, reducing the noise transmitted outside the chassis.

[0007] Preferably, the intake pipe is equipped with an intake filter for filtering the air entering the compressor; the outlet pipe is equipped with an outlet filter for filtering the air output from the compressor.

[0008] Preferably, an air intake box is installed on one side of the chassis, which is used to draw in outside air. An air intake port is installed on one side of the air intake box, and several air intake fans are installed inside the air intake box. The air intake fans draw in air from the air intake port. The lower part of the air intake box is connected to the lower air intake, and the upper part is connected to the air intake pipe. Several sound-absorbing cottons are installed on the inner wall of the air intake box.

[0009] Preferably, the chassis is equipped with a support plate, and the bottom of the compressor is fixedly equipped with a base plate. The base plate is connected to the support plate through a shock-absorbing device. The base plate is provided with a number of second through holes for air flow, and the support plate is also provided with a number of first through holes for air flow. The first through holes are connected to the lower air intake, so as to realize the connection between the lower air intake, the compressor and the upper air outlet from bottom to top, thereby cooling the compressor.

[0010] Preferably, the lower air intake includes an air inlet connected to the air intake box, and at least includes a first layer plate and a second layer plate placed horizontally; the first layer plate, the second layer plate, and the support plate are arranged sequentially from bottom to top; a first connecting port is provided on the side of the first layer plate away from the air inlet, and a second connecting port is provided on the side of the second layer plate near the air inlet; the lower air intake enters through the air inlet and passes sequentially through the lower part of the first layer plate, the first connecting port, the lower part of the second layer plate, the second connecting port, and the first through hole to achieve S-shaped flow.

[0011] Preferably, the upper air outlet includes an air outlet connected to the chassis, and at least a horizontally placed third and fourth layer plates; the third layer plate, the fourth layer plate, and the air outlet are arranged sequentially from bottom to top; a third connecting port is provided on the side of the third layer plate near the air outlet, and a fourth connecting port is provided on the side of the fourth layer plate away from the air outlet; the upper air outlet enters through the third connecting port, and sequentially passes through the upper part of the third layer plate, the fourth connecting port, the upper part of the fourth layer plate, and the air outlet to achieve S-shaped airflow.

[0012] Preferably, the upper and lower surfaces of the first, second, third, and fourth layers are all equipped with sound-absorbing cotton.

[0013] Preferably, the shock absorption device includes a first shock absorption rubber sleeve mounted on a support plate, a second shock absorption rubber sleeve mounted on a base plate, and a shock absorption spring mounted between the first and second shock absorption rubber sleeves; the first shock absorption rubber sleeve has a receiving groove inside to accommodate the shock absorption spring, and the second shock absorption rubber sleeve has an insertion protrusion in the middle that inserts into the shock absorption spring; the receiving groove and the insertion protrusion cooperate to limit the shock absorption spring.

[0014] Preferably, the base plate has several round holes on both sides, and the support plate has several guide rods. The guide rods are inserted into the round holes and are limited by the limiting caps installed at the ends of the guide rods; the bottom of the chassis is equipped with shock-absorbing pads.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention addresses noise reduction and quiet operation in three ways. First, a noise-reducing component is installed inside the casing to minimize compressor noise. This component consists of sound-absorbing cotton installed on the inner wall of the casing, which disperses compressor noise and reduces noise transmitted outside the casing. Second, the compressor mounting structure is improved by installing a vibration damping device at the connection between the compressor bottom and the casing. This reduces vibration between the compressor and the casing, thereby reducing noise. Finally, the compressor's cooling air duct is improved. The cooling air duct includes a lower air inlet installed on the lower side of the casing and an upper air outlet installed on the upper side of the casing. Both the lower air inlet and the upper air outlet are S-shaped, flowing from bottom to top through the compressor, changing the direction of noise propagation. This reduces the noise of the air compressor, making it quieter to use and suitable for enclosed spaces, thus avoiding a poor user experience. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of a low-noise air compression device for confined spaces provided by this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of a low-noise air compression device for confined spaces provided by this utility model;

[0020] Figure 3 This is a side view of the air compressor housing and air intake box of a low-noise enclosed space air compressor provided by this utility model;

[0021] Figure 4 This is a schematic diagram of the front structure of the air compressor housing and air intake box of a low-noise enclosed space air compressor provided by this utility model;

[0022] Figure 5 This is an exploded view of the shock absorption device provided by this utility model.

[0023] The diagram includes:

[0024] 1. Chassis; 2. Compressor; 3. Inlet pipe; 4. Outlet pipe; 5. Noise reduction components; 6. Cooling air duct; 61. Lower air intake; 62. Upper air exhaust; 7. Vibration damping device; 31. Inlet filter; 41. Outlet filter; 8. Inlet housing; 81. Intake port; 82. Intake fan; 9. Support plate; 92. Base plate; 93. Second through hole; 91. First through hole; 611. Air inlet; 612. First shelf; 61 3. Second layer plate; 614. First connecting port; 615. Second connecting port; 621. Air outlet; 622. Third layer plate; 623. Fourth layer plate; 624. Third connecting port; 625. Fourth connecting port; 71. First shock-absorbing rubber sleeve; 72. Second shock-absorbing rubber sleeve; 73. Shock-absorbing spring; 711. Receiving groove; 721. Insertion protrusion; 94. Round hole; 95. Guide rod; 96. Limiting cap; 97. Shock-absorbing foot pad. Detailed Implementation

[0025] The technical solution of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please refer to Figures 1 to 5 This utility model provides a low-noise air compression device for enclosed spaces.

[0027] like Figure 1 As shown, the air compression device includes a housing 1 and an air intake box 8 installed on one side of the housing 1. The housing 1 is equipped with a compressor 2, which is used to compress air. The air intake box 8 is used to input air into the housing 1 and the compressor 2, so that the compressor 2 has a sufficient air source and cooling air. Since the housing 1 and the compressor 2 are installed in a small area or a closed space, they need separate cooling air and a sufficient air source.

[0028] like Figure 1As shown, the casing 1 is equipped with an air inlet pipe 3 for the compressor 2 to enter the air, and an air outlet pipe 4 for the compressor 2 to exit the air, on one side.

[0029] like Figure 1 As shown, in order to reduce noise, four shock-absorbing feet 97 are installed at the bottom of the chassis 1 to reduce the overall vibration of the chassis 1, thereby reducing noise.

[0030] like Figure 2 As shown, in order to reduce noise, the interior of the chassis 1 is modified in this embodiment. The chassis 1 is equipped with a noise reduction component 5 for reducing the noise of the compressor 2. The noise reduction component 5 is sound-absorbing cotton installed on the inner wall of the chassis 1. The sound-absorbing cotton disperses the noise of the compressor 2 and keeps it inside the chassis 1, reducing the noise transmitted to the outside of the chassis 1.

[0031] like Figure 3 As shown, in this embodiment, the connection between the chassis 1 and the compressor 2 is modified. A shock-absorbing device 7 is installed at the connection between the bottom of the compressor 2 and the chassis 1. The shock-absorbing device 7 has a damping elastic component inside, which can prevent the bottom of the compressor 2 from directly contacting the chassis 1, thereby reducing the transmission of the vibration of the compressor 2 to the chassis 1 and thus reducing the noise generated by the vibration.

[0032] like Figure 2 As shown, the compressor 2 is equipped with a cooling air duct 6, which includes a lower air inlet 61 installed on the lower side of the casing 1 and an upper air outlet 62 installed on the upper side of the casing 1. The lower air inlet 61 and the upper air outlet 62 sandwich the compressor 2 in the middle and flow through the compressor 2 from bottom to top to cool the compressor 2. Furthermore, both the lower air inlet 61 and the upper air outlet 62 are S-shaped and flow through the compressor 2 from bottom to top, changing the direction of noise propagation. The compressor 2 disperses noise in all directions, but because the cooling air is vertically upward and perpendicular to the direction of noise propagation, it can interfere with the direction of noise propagation, thereby reducing noise.

[0033] like Figure 1 As shown, in order to purify the air flowing into and out of the compressor 2, extend the service life of the compressor 2, and ensure the cleanliness of the compressed air output, an intake filter 31 is installed on the intake pipe 3, which is used to filter the air entering the compressor 2; an outlet filter 41 is installed on the outlet pipe 4, which is used to filter the air output from the compressor 2.

[0034] like Figure 1 As shown, an air intake box 8 is installed on one side of the chassis 1. The air intake box 8 is used to draw in external air, part of which is used to cool the compressor 2, and the other part is used to input into the compressor 2 for compression.

[0035] like Figure 1 As shown, an air intake port 81 is installed on one side of the air intake box 8, such as... Figure 2 As shown, the air intake box 8 is equipped with two air intake fans 82 arranged in parallel inside. The air intake fans 82 draw in air from the air intake port 81. The lower part of the air intake box 8 is connected to the lower air intake 61 through the air inlet 611, and the upper part is connected to the air intake pipe 3 through the air intake filter 31. Several sound-absorbing cottons are installed on the inner wall of the air intake box 8 and on the air intake fans 82.

[0036] like Figure 2 As shown, a base plate 92 is fixedly installed at the bottom of the compressor 2. The base plate 92 has a concave part for placing and restricting the compressor 2. At the same time, since space needs to be left for the lower air intake 61, a support plate 9 is installed inside the casing 1. The lower air intake 61 is between the casing 1 and the support plate 9. The base plate 92 is connected to the support plate 9 through four shock-absorbing devices 7.

[0037] To facilitate the flow of air from bottom to top and through the compressor 2, the base plate 92 is provided with several second through holes 93 for air flow, and the support plate 9 is also provided with several first through holes 91 for air flow. The first through holes 91 are connected to the lower air inlet 61, so as to realize the connection between the lower air inlet 61, the compressor 2 and the upper air outlet 62 from bottom to top, thereby cooling the compressor 2.

[0038] like Figure 4 As shown, the lower air inlet 61 includes an air inlet 611 connected to the air inlet box 8. In this embodiment, it also includes a horizontally placed first shelf 612 and second shelf 613; in other embodiments, it may include multiple shelves; the first shelf 612, the second shelf 613, and the support plate 9 are arranged sequentially from bottom to top; a first connecting port 614 is provided on the side of the first shelf 612 away from the air inlet 611, and the first connecting port 614 is located at... Figure 4 On the right side, a second connecting port 615 is provided on the side of the second layer plate 613 near the air inlet 611; the second connecting port 615 is located at... Figure 4 On the left side.

[0039] In terms of airflow direction, the lower air inlet 61 enters through the air inlet 611, passes sequentially through the lower part of the first layer plate 612, the first connecting port 614, the lower part of the second layer plate 613, the second connecting port 615, the first through hole 91 and the second through hole 93, and reaches the area around the compressor 2, realizing S-shaped flow at the lower part of the compressor 2.

[0040] Similarly, such as Figure 2As shown, the upper air outlet 62 includes an air outlet 621 connected to the chassis 1, and the air outlet 621 is located on the left side; in this embodiment, it also includes a horizontally placed third layer plate 622 and a fourth layer plate 623; the third layer plate 622, the fourth layer plate 623 and the air outlet 621 are arranged sequentially from bottom to top; as Figure 4 As shown, the third layer plate 622 has a third connecting port 624 on the side near the air outlet 621. The third connecting port 624 is located at... Figure 4 On the left side, a fourth connecting port 625 is provided on the side of the fourth layer plate 623 away from the air outlet 621; the fourth connecting port 625 is located on... Figure 4 On the right side.

[0041] The airflow direction is as follows: the air passing through the compressor 2 enters through the third connecting port 624, and passes through the upper part of the third layer plate 622, the fourth connecting port 625, the upper part of the fourth layer plate 623 and the air outlet 621 in sequence to achieve S-shaped airflow.

[0042] To better absorb sound and reduce noise, the upper and lower surfaces of the first layer 612, the second layer 613, the third layer 622, and the fourth layer 623 are all equipped with sound-absorbing cotton.

[0043] like Figure 5 As shown, the base plate 92 is connected to the support plate 9 via four shock-absorbing devices 7. The shock-absorbing device 7 includes a first shock-absorbing rubber sleeve 71 mounted on the support plate 9, a second shock-absorbing rubber sleeve 72 mounted on the base plate 92, and a shock-absorbing spring 73 mounted between the first shock-absorbing rubber sleeve 71 and the second shock-absorbing rubber sleeve 72. To fix the lower end of the shock-absorbing spring 73, the first shock-absorbing rubber sleeve 71 has a receiving groove 711 inside to accommodate the lower end of the shock-absorbing spring 73. To fix the upper end of the shock-absorbing spring 73, the second shock-absorbing rubber sleeve 72 has an insertion protrusion 721 in the middle that inserts into the shock-absorbing spring 73. The receiving groove 711 and the insertion protrusion 721 cooperate to limit the shock-absorbing spring 73. The shock-absorbing spring 73 absorbs the vibration of the compressor 2, thereby reducing vibration and noise.

[0044] like Figure 5 As shown, in order to limit the base plate 92 and compressor 2 and prevent vibration from causing the shock absorber 7 to detach or be damaged; if the vibration is too large, the shock absorber spring 73 may detach from either the receiving groove 711 or the insertion protrusion 721. To prevent the above-mentioned event from occurring, guide rods 95 and limiting caps 96 are provided; specifically, the base plate 92 has several circular holes 94 on both sides, and the support plate 9 has several guide rods 95. The guide rods 95 are inserted into the circular holes 94 and are limited by the limiting caps 96 installed at the ends of the guide rods 95.

[0045] This invention achieves noise reduction and quiet operation in several aspects. First, in terms of overall structure, multiple sound-absorbing cotton materials are installed inside the casing 1 and the air intake box 8 to absorb most of the sound. Four shock-absorbing feet 97 are installed at the bottom of the casing 1 to reduce overall vibration and thus reduce noise. Second, the installation structure of the compressor 2 is improved. The base plate 92 is connected to the support plate 9 through four shock-absorbing devices 7. The shock-absorbing devices 7 have damping elastic components inside to prevent the bottom of the compressor 2 from directly contacting the casing 1. This reduces the transmission of vibration from compressor 2 to chassis 1, thereby reducing noise generated by vibration. Finally, the cooling duct 6 of compressor 2 is improved, comprising a lower air inlet 61 installed on the lower side of the chassis and an upper air outlet 62 installed on the upper side of the chassis. Both the lower air inlet 61 and the upper air outlet 62 are S-shaped, flowing from bottom to top through compressor 2, thus changing the direction of noise propagation. This reduces the noise of the air compression equipment, making it quieter during use, suitable for enclosed spaces, and avoiding a poor user experience.

[0046] The airflow direction is such that part of it is used to cool the compressor 2, and the other part is used to input into the compressor 2 for compression. The intake fan 82 draws in air from the intake port 81, and the upper part is connected to the intake pipe 3 through the intake filter 31. After being compressed by the compressor 2, the air is output through the outlet pipe 4 and filtered by the outlet filter 41 before being output. The lower part of the intake box 8 is connected to the lower air intake 61 through the air inlet 611. The lower air intake 61 enters through the air inlet 611, passes through the lower part of the first layer plate 612, the first connecting port 614, the lower part of the second layer plate 613, the second connecting port 615, the first through hole 91 and the second through hole 93 in sequence, and reaches the area around the compressor 2 to cool the compressor 2, remove the heat generated by the compressor 2, and interfere with the noise generated by the compressor 2. The air that has passed through the compressor 2 enters through the third connecting port 624, passes through the upper part of the third layer plate 622, the fourth connecting port 625, the upper part of the fourth layer plate 623 and the air outlet 621 in sequence to achieve S-shaped airflow.

[0047] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A low-noise air compression apparatus for use in an enclosed space, characterized by: The utility model provides a kind of air compressor, including cabinet (1), the compressor (2) for compressing air is equipped inside the cabinet (1), the air inlet pipe (3) for compressor (2) air intake is equipped on one side of the cabinet (1), and the air outlet pipe (4) for compressor (2) air outlet is equipped on the other side;The cabinet (1) is equipped with the noise reduction component (5) for reducing the noise of compressor (2) inside;The cooling air duct (6) is equipped inside the compressor (2), and the cooling air duct (6) includes the lower air inlet (61) equipped in the lower side of cabinet (1) and the upper air outlet (62) equipped in the upper side of cabinet (1);The lower air inlet (61) and upper air outlet (62) are all S-shaped, and the direction of propagation of noise is changed from bottom to top through compressor (2);The damping device (7) is equipped at the connection of compressor (2) bottom and cabinet (1).

2. A low-noise air compression apparatus for a confined space according to claim 1, characterized in that: The noise reduction component (5) is sound-absorbing cotton equipped in the inner wall of cabinet (1), which disperses the noise of compressor (2) and remains inside the cabinet (1), reducing the noise transmitted outside the cabinet (1).

3. The low-noise air compression apparatus for a confined space of claim 1, wherein: The air inlet filter (31) is equipped on the air inlet pipe (3), which is used to filter the air entering the compressor (2);The air outlet filter (41) is equipped on the air outlet pipe (4), which is used to filter the air output from the compressor (2).

4. The low-noise air compression apparatus for a confined space of claim 1, wherein: The air inlet box (8) is equipped on one side of the cabinet (1), which is used to suck external air, and the air inlet box (8) is equipped with air suction port (81) on one side, a plurality of air suction fans (82) are equipped inside the air inlet box (8), the air suction fans (82) suck air from the air suction port (81), the lower part of the air inlet box (8) is communicated with the lower air inlet (61), and the upper part is communicated with the air inlet pipe (3), and a plurality of sound-absorbing cottons are equipped on the inner wall of the air inlet box (8).

5. A low-noise air compression apparatus for a confined space according to claim 4, characterized in that: The support sheet (9) is equipped inside the cabinet (1), the bottom plate (92) is fixedly equipped on the bottom of the compressor (2), the bottom plate (92) is connected with the support sheet (9) through the damping device (7), a plurality of second through holes (93) for air flow are arranged on the bottom plate (92), a plurality of first through holes (91) for air flow are also arranged on the support sheet (9), the first through holes (91) are connected with the lower air inlet (61), the lower air inlet (61), the compressor (2) and the upper air outlet (62) are communicated from bottom to top, so as to cool the compressor (2).

6. A low-noise air compression apparatus for a confined space according to claim 5, characterized in that: The lower air inlet (61) comprises an air inlet (611) communicated with the air inlet box (8), and further comprises at least a first layer plate (612) and a second layer plate (613) arranged horizontally; the first layer plate (612), the second layer plate (613) and the support sheet (9) are sequentially arranged from bottom to top; the first layer plate (612) is provided with a first communication port (614) on the side away from the air inlet (611), and the second layer plate (613) is provided with a second communication port (615) on the side close to the air inlet (611); the lower air inlet (61) enters from the air inlet (611), sequentially passes through the lower part of the first layer plate (612), the first communication port (614), the lower part of the second layer plate (613), the second communication port (615) and the first through hole (91) to realize S-shaped flow circulation.

7. A low noise air compression apparatus for a confined space according to claim 6, wherein: The upper air outlet (62) comprises an air outlet (621) communicated with the case (1), and further comprises at least a third layer plate (622) and a fourth layer plate (623) arranged horizontally; the third layer plate (622), the fourth layer plate (623) and the air outlet (621) are sequentially arranged from bottom to top; the third layer plate (622) is provided with a third communication port (624) on the side close to the air outlet (621), and the fourth layer plate (623) is provided with a fourth communication port (625) on the side away from the air outlet (621); the upper air outlet (62) enters from the third communication port (624), sequentially passes through the upper part of the third layer plate (622), the fourth communication port (625), the upper part of the fourth layer plate (623) and the air outlet (621) to realize S-shaped flow circulation.

8. A low noise air compression apparatus for a confined space according to claim 7, wherein: The upper and lower surfaces of the first layer plate (612), the second layer plate (613), the third layer plate (622) and the fourth layer plate (623) are provided with sound-absorbing cotton.

9. The low-noise air compression apparatus for a confined space of claim 5, wherein: The damping device (7) comprises a first damping rubber sleeve (71) arranged on the support sheet (9), a second damping rubber sleeve (72) arranged on the bottom plate (92) and a damping spring (73) arranged between the first damping rubber sleeve (71) and the second damping rubber sleeve (72); the first damping rubber sleeve (71) is provided with an accommodating groove (711) for accommodating the damping spring (73), and the second damping rubber sleeve (72) is provided with an insertion protrusion (721) inserted into the damping spring (73); the accommodating groove (711) and the insertion protrusion (721) cooperate to limit the damping spring (73).

10. A low-noise air compression apparatus for a confined space according to claim 9, wherein: The bottom plate (92) is provided with a plurality of circular holes (94) on both sides, the support sheet (9) is provided with a plurality of guide rods (95), the guide rods (95) are inserted into the circular holes (94) and are limited by limiting caps (96) arranged at the ends of the guide rods (95); the case (1) is provided with a damping foot pad (97) at the bottom.

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