Pneumatic acceleration chamber and stone coal discharge equipment

Abstract

The present disclosure relates to a pneumatic acceleration chamber and a stone coal discharge device, the pneumatic acceleration chamber comprises an acceleration chamber body, a connector, a connecting pipe and a clamp; the acceleration chamber body comprises a conveying pipe and a feeding pipe, the conveying pipe has an air inlet end and an output end, the feeding pipe has a feeding end and a discharging end, the discharging end is fixed to the outer peripheral surface of the conveying pipe and communicates with the inside of the conveying pipe; the connector comprises a sleeve and a connecting flange, the connecting flange is arranged at one end of the sleeve, the connecting flange is used to connect with a negative pressure pipe, and the output end can be sealed and plugged in the sleeve; the first end of the connecting pipe is used to connect with the feeding pipe; the second end of the connecting pipe is detachably sealed and docked with the feeding end through a clamp. Through the plug-in sealing of the output end and the sleeve and the clamp sealing docking of the feeding pipe and the connecting ring, the acceleration chamber body can be quickly installed; through the clamp releasing the sealing docking of the feeding pipe and the connecting ring and the separation of the output end and the sleeve, the acceleration chamber body can be quickly disassembled.

Description

Technical Field

[0001] The present disclosure relates to a pulverizing system for a boiler in a thermal power plant, and in particular to a pneumatic acceleration chamber and a pebble coal discharging device. Background Art

[0002] The boiler pulverizing system of a high-parameter thermal power plant generally adopts a medium-speed coal mill for pulverizing. The small gravel and coal particles in the coal that cannot be pulverized will be discharged from the coal hopper to the shaftless screw conveyor as the coal mill runs, and then discharged from the discharge pipe of the shaftless screw conveyor to the negative pressure conveying device. The negative pressure conveying device transports the gravel coal to the gravel coal bunker, and then loaded onto trucks for transportation.

[0003] A pneumatic acceleration chamber is usually arranged between the discharge pipe of the shaftless screw conveyor and the negative pressure pipe of the negative pressure conveying device. The pebble coal is quantitatively and uniformly conveyed to the pneumatic acceleration chamber by the shaftless screw conveyor. The pebble coal falling into the pneumatic acceleration chamber is mixed with air and moves under the negative pressure of the negative pressure pipe, so that the pebble coal is transported in the conveying pipeline and finally transported to the pebble coal bin.

[0004] Because stone coal sometimes contains dense metal mineral particles or alloy drill bits left over from mining that cannot be sucked away by negative pressure, the pneumatic acceleration chamber is often blocked. To clear the blockage, the pneumatic acceleration chamber must be dismantled first for cleaning, and then reinstalled.

[0005] In the related art, the pneumatic acceleration chamber is connected to the flange of the discharge pipe of the shaftless screw conveyor and the flange of the negative pressure pipe respectively by flanges. This flange connection method makes the removal and installation process of the pneumatic acceleration chamber very complicated and time-consuming. Utility Model Content

[0006] The purpose of the present disclosure is to provide a pneumatic acceleration chamber and a pebble coal discharge device to solve the technical problem that the disassembly and installation process of the pneumatic acceleration chamber is complicated and time-consuming.

[0007] In order to achieve the above-mentioned purpose, the present disclosure provides a pneumatic acceleration chamber on the one hand, which includes an acceleration chamber body, a connecting piece, a connecting pipe and a clamp; the acceleration chamber body includes a conveying pipe and a feeding pipe, the conveying pipe has an air inlet end and an output end, the feeding pipe has a feeding end and a discharging end, the discharging end is fixed to the outer circumferential surface of the conveying pipe and is connected to the interior of the conveying pipe; the connecting piece includes a sleeve and a connecting flange, the connecting flange is arranged at one end of the sleeve, the connecting flange is used to connect with a negative pressure pipe, and the output end can be sealed and inserted in the sleeve; the first end of the connecting pipe is used to connect with the feeding pipe; the second end of the connecting pipe is detachably sealed and docked with the feeding end through the clamp.

[0008] Optionally, the connecting flange has a connecting hole coaxially connected to the sleeve, and the aperture of the connecting hole is smaller than the inner diameter of the sleeve, so that the connecting flange has an annular protrusion protruding from the inner wall of the sleeve along the radial direction of the sleeve, and the annular protrusion is used for the output end to abut against.

[0009] Optionally, the aperture of the communicating hole is equal to the inner diameter of the conveying pipe, and the inner diameter of the sleeve is equal to the outer diameter of the conveying pipe.

[0010] Optionally, a sealing ring is provided in the sleeve, one side of the sealing ring abuts against the annular protrusion, and the other side of the sealing ring is used for abutment by the output end.

[0011] Optionally, the sealing ring is a packing ring.

[0012] Optionally, a first docking ring is fixed on the feed end, and a second docking ring is fixed on the second end of the connecting pipe. The first docking ring can be detachably connected to the second docking ring through the clamp, and the end face of the first docking ring can fit with the end face of the second docking ring.

[0013] Optionally, the clamp is a grooved clamp.

[0014] Optionally, a roller mechanism is provided at the bottom of the acceleration chamber body, and the roller mechanism is fixedly connected to the acceleration chamber body. The roller mechanism can drive the acceleration chamber body to translate, so that the output end of the delivery tube moves horizontally and is inserted into the sleeve.

[0015] Optionally, the roller mechanism includes a mounting seat and a plurality of universal rollers, wherein the mounting seat is located below the acceleration chamber body and is fixedly connected to the delivery pipe, and the plurality of universal rollers are distributed at the bottom of the mounting seat.

[0016] On the other hand, the present disclosure provides a pebble coal discharge equipment, which includes a shaftless screw conveyor, a negative pressure conveying device and the above-mentioned pneumatic acceleration chamber; the shaftless screw conveyor is used to be connected to the pebble coal hopper of the coal mill, the shaftless screw conveyor includes a feed pipe, and the negative pressure conveying device includes a negative pressure pipe; the first end of the connecting pipe of the pneumatic acceleration chamber is connected to the feed pipe, and the connecting flange of the connecting piece of the pneumatic acceleration chamber is connected to the negative pressure pipe.

[0017] Through the above technical solution, when installing the pneumatic acceleration chamber, the connecting flange of the connecting piece can be connected to the negative pressure pipe, and the first end of the connecting pipe can be connected to the feed pipe. By sealing and plugging the output end of the delivery pipe into the sleeve, and docking the second end of the connecting pipe with the feed end of the feed pipe through the clamp, the installation of the pneumatic acceleration chamber can be realized. When disassembling the main body of the acceleration chamber, it is only necessary to pull the clamp to release the docking of the second end of the connecting pipe with the feed end, and then pull the delivery pipe out of the sleeve, and the main body of the acceleration chamber can be quickly disassembled. When the main body of the acceleration chamber needs to be reinstalled, it is only necessary to seal the output end of the delivery pipe into the sleeve, and align the second end of the connecting pipe with the feed end and lock it through the clamp, and the main body of the acceleration chamber can be quickly installed. The entire disassembly and installation process of the acceleration chamber main body does not require the disassembly and installation of bolts and flanges, which solves the technical problem that the disassembly and installation process of the pneumatic acceleration chamber is cumbersome and time-consuming when the pneumatic acceleration chamber needs to be dredged.

[0018] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a pneumatic acceleration chamber provided in an exemplary embodiment of the present disclosure.

[0021] Figure 2 is an exploded view of a pneumatic acceleration chamber provided by an exemplary embodiment of the present disclosure;

[0022] Figure 3 is a schematic cross-sectional structure diagram of a pneumatic acceleration chamber provided by an exemplary embodiment of the present disclosure;

[0023] Figure 4 It is a schematic diagram of the installation of a pneumatic acceleration chamber provided in an exemplary embodiment of the present disclosure.

[0024] Description of Reference Numerals

[0025] 10-negative pressure pipe; 20-feeding pipe;

[0026] 100 - acceleration chamber body; 110 - delivery pipe; 111 - air inlet end; 112 - output end; 120 - feed pipe; 121 - feed end; 122 - discharge end; 130 - first docking ring;

[0027] 200-connecting piece; 210-sleeve; 220-connecting flange; 221-connecting hole; 222-annular convex part; 230-sealing ring;

[0028] 300-connecting pipe; 310-second docking ring;

[0029] 400-clamp;

[0030] 500-roller mechanism; 510-mounting seat; 520-roller. DETAILED DESCRIPTION

[0031] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0032] In the description of the present disclosure, it should be understood that the terms "upper", "lower" and the like indicate positions or location relationships based on the accompanying drawings (such as Figure 3 ) is defined only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, a specific orientation structure and operation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "inside" and "outside" refer to the inside and outside of the corresponding structural contour. In addition, the terms "first", "second", etc. are only used to distinguish one element from another, and do not have order and importance.

[0033] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0034] The present disclosure provides, on one hand, a pneumatic acceleration chamber, which can simplify the disassembly and installation process of the pneumatic acceleration chamber, thereby achieving rapid disassembly and installation of the pneumatic acceleration chamber.

[0035] like Figures 1 to 4As shown, the pneumatic acceleration chamber provided by the present disclosure includes an acceleration chamber body 100, a connector 200, a connecting pipe 300 and a clamp 400. The acceleration chamber body 100 includes a delivery pipe 110 and a feed pipe 120, the delivery pipe 110 has an air inlet end 111 and an output end 112, the feed pipe 120 has a feed end 121 and a discharge end 122, the discharge end 122 is fixed to the outer peripheral surface of the delivery pipe 110 and communicates with the interior of the delivery pipe 110; the connector 200 includes a sleeve 210 and a connecting flange 220, the connecting flange 220 is arranged at one end of the sleeve 210, the connecting flange 220 is used to connect with the negative pressure pipe 10, and the output end 112 can be sealed and plugged in the sleeve 210; the first end of the connecting pipe 300 is used to connect with the feed pipe 20; the second end of the connecting pipe 300 is detachably sealed and docked with the feed end 121 through the clamp 400.

[0036] Through the above technical solution, when installing the pneumatic acceleration chamber, the connecting flange 220 of the connecting piece 200 can be connected to the negative pressure pipe 10, and the first end of the connecting pipe 300 can be connected to the feed pipe 20. The installation of the pneumatic acceleration chamber can be achieved by sealingly inserting the output end 112 of the conveying pipe 110 into the sleeve 210, and connecting the second end of the connecting pipe 300 with the feed end 121 of the feed pipe 20 through the clamp 400.

[0037] It can be understood that the location where the pneumatic acceleration chamber is blocked is mainly on the acceleration chamber body 100. When the acceleration chamber body 100 is blocked and needs to be disassembled, it is only necessary to pull the clamp 400 to release the docking between the second end of the connecting pipe 300 and the feed end 121, and then pull the delivery pipe 110 out of the sleeve 210, so that the acceleration chamber body 100 can be quickly disassembled. When the acceleration chamber body 100 needs to be reinstalled, it is only necessary to seal the output end 112 of the delivery pipe 110 into the sleeve 210, and align the second end of the connecting pipe 300 with the feed end 121 and lock it with the clamp 400, so that the acceleration chamber body 100 can be quickly installed. The entire disassembly and installation process of the acceleration chamber body 100 does not require the disassembly and installation of bolts and flanges, which solves the technical problem that the disassembly and installation process of the pneumatic acceleration chamber is cumbersome and time-consuming when the pneumatic acceleration chamber needs to be unblocked.

[0038] It should be noted that the air inlet end 111 of the conveying pipe 110 can be used to communicate with the atmosphere, and the negative pressure suction force generated by the negative pressure pipe 10 can make the stone coal and air mix and be sucked into the negative pressure pipe 10 together.

[0039] In some optional embodiments, the connecting flange 220 has a connecting hole 221 that is coaxially connected to the sleeve 210, and the aperture of the connecting hole 221 is smaller than the inner diameter of the sleeve 210, so that the connecting flange 220 has an annular protrusion 222 that protrudes from the inner wall of the sleeve 210 along the radial direction of the sleeve 210, and the annular protrusion 222 is used for the output end 112 to abut against.

[0040] By forming the annular protrusion 222 on the connection flange 220, on one hand, after the output end 112 is inserted into the sleeve 210, the annular protrusion 222 can limit the insertion depth of the output end 112; on the other hand, after the output end 112 and the annular protrusion 222 abut against each other, the end surface of the output end 112 and the end surface of the annular protrusion 222 can be in surface contact and seal. Thus, the output end 112 is sealed and inserted into the sleeve 210.

[0041] Of course, in some other optional implementations, the output end 112 may be sealed and inserted into the sleeve 210 by sealing the outer peripheral surface of the delivery tube 110 with the inner wall surface of the sleeve 210 .

[0042] In some optional embodiments, the aperture of the communication hole 221 is equal to the inner diameter of the delivery pipe 110, and the inner diameter of the casing 210 is equal to the outer diameter of the delivery pipe 110. When the output end 112 of the delivery pipe 110 is inserted into the casing 210, since the inner diameter of the casing 210 is equal to the outer diameter of the delivery pipe 110, the delivery pipe 110 and the casing 210 can be coaxial, and the aperture of the through hole is equal to the inner diameter of the delivery pipe 110, so that the inner diameter of the delivery pipe 110 and the communication hole 221 can be smoothly transitioned, and the annular protrusion will not block the stone coal from passing, reducing the risk of clogging of the pneumatic acceleration chamber.

[0043] In order to further improve the sealing effect after the output end 112 abuts against the annular protrusion 222, in some optional embodiments, a sealing ring 230 is disposed in the sleeve 210, one side of the sealing ring 230 abuts against the annular protrusion 222, and the other side of the sealing ring 230 is used for the output end 112 to abut.

[0044] A sealing ring 230 is arranged in the sleeve 210. After the output end 112 of the delivery tube 110 is inserted into the sleeve 210, the output end 112 can abut the sealing ring 230 against the annular protrusion 222, so that the output end 112 is indirectly abutted through the sealing ring 230, and the sealing effect between the output end 112 and the annular protrusion 222 is improved by the sealing ring 230.

[0045] The type of the sealing ring 230 may be a rubber sealing ring, an asbestos sealing ring, or a packing sealing ring, etc., and the present disclosure does not impose any specific restrictions on this. In the embodiment provided by the present disclosure, the sealing ring 230 is a packing ring, which has the advantages of simple manufacturing, convenient filling, and good self-lubricating performance, and is more suitable for the sealing of the pneumatic acceleration chamber that needs to be disassembled and installed many times.

[0046] In order to improve the sealing performance after the connecting pipe 300 is connected to the feeding pipe 120, in some optional embodiments, a first docking ring 130 is fixed on the feeding end 121, and a second docking ring 310 is fixed to the second end of the connecting pipe 300. The first docking ring 130 can be detachably connected to the second docking ring 310 through a clamp 400, and the end face of the first docking ring 130 can be fitted with the end face of the second docking ring 310.

[0047] By providing the first docking ring 130 and the second docking ring 310, and detachably connecting the first docking ring 130 and the second docking ring 310 through the clamp 400, the end face of the first docking ring 130 can be fitted with the end face of the second docking ring 310 to achieve surface sealing. Since the first docking ring 130 and the second docking ring 310 increase the docking area, the sealing performance of the connecting pipe 300 after docking with the feed pipe 120 is guaranteed.

[0048] The type of the clamp 400 may be a flat clamp or a groove clamp, and the present disclosure does not impose any specific restrictions thereon. In order to improve the stability of the connection between the clamp 400 and the first docking ring 130 and the second docking ring 310, in some optional embodiments, the clamp 400 may be a groove clamp, and the inner circumference of the groove clamp has a groove, which can accommodate the first docking ring 130 and the second docking ring 310, and can reduce the risk of the clamp 400 falling off.

[0049] Since the pneumatic acceleration chamber is heavy (generally more than 70 kg), in order to facilitate the operator to disassemble and install the acceleration chamber body 100, in some optional embodiments, such as Figures 1 to 4 As shown, a roller mechanism 500 is provided at the bottom of the acceleration chamber body 100 , and the roller mechanism 500 is fixedly connected to the acceleration chamber body 100 . The roller mechanism 500 can drive the acceleration chamber body 100 to translate, so that the output end 112 of the delivery tube 110 moves horizontally and is inserted into the sleeve 210 .

[0050] After the roller mechanism 500 is provided, the acceleration chamber body 100 can be moved on the ground by the roller mechanism 500, so that the installation height of the acceleration chamber body 100 can be fixed, and the operator does not need to use a lifting device to lift the acceleration chamber body 100. When the operator installs or removes the acceleration chamber body 100 and clears the blockage inside the acceleration chamber body 100, only one person is needed to operate, which saves manpower and improves efficiency.

[0051] Regarding the specific structure of the roller mechanism 500, in some optional embodiments, the roller mechanism 500 includes a mounting seat 510 and a plurality of universal rollers 520. The mounting seat 510 is located below the acceleration chamber body 100 and is fixedly connected to the conveying pipe 110. The plurality of universal rollers 520 are distributed at the bottom of the mounting seat 510.

[0052] The plurality of universal rollers 520 can not only provide a stable supporting force for the acceleration chamber body 100 , but also enable the acceleration chamber body 100 to move in any direction in the horizontal direction, making it more convenient to install and disassemble the acceleration chamber body 100 .

[0053] In some optional embodiments, such as Figure 1 and Figure 2 As shown, the feed pipe 120 adopts a structure of an upper circle and a lower part, that is, the feed end 121 of the feed pipe 120 is circular, which can make the feed end 121 adapt to the inner diameter and outer diameter of the connecting pipe 300 on the one hand, and can also make the feed end 121 adapt to the first docking ring 130 on the other hand. The discharge end 122 of the feed pipe 120 is square, and the opening area of ​​the discharge end 122 of the feed pipe 120 is larger than the opening area of ​​the feed end 121 of the feed pipe 120. From the feed end 121 to the discharge end 122 of the feed pipe 120, the cross-sectional area inside the feed pipe 120 gradually increases, so that the stone coal can be more easily dispersed in the process of reaching the discharge end 122 from the feed end 121, and then the stone coal can be more easily adsorbed into the negative pressure pipe 10 under the action of negative pressure, which reduces the risk of stone coal blocking in the acceleration chamber body 100 to a certain extent.

[0054] In some optional embodiments, the discharge end 122 of the feed pipe 120 penetrates into the conveying pipe 110, reducing the distance between the discharge end 122 and the wall of the conveying pipe 110, thereby improving the effect of negative pressure on the stone coal.

[0055] In some optional embodiments, the discharge end 122 of the feed pipe 120 is inclined toward the output end 112 of the conveying pipe 110 to provide the pebble coal exiting from the discharge end 122 with an initial moving direction toward the output end 112 of the conveying pipe 110, thereby making it easier for the pebble coal to reach the negative pressure pipe 10.

[0056] Based on the above-mentioned pneumatic acceleration chamber, the present disclosure also provides a stone coal discharge device in another aspect, such as Figure 4 As shown, the pebble coal discharge equipment includes a shaftless screw conveyor, a negative pressure conveying device and the above-mentioned pneumatic acceleration chamber; the shaftless screw conveyor is used to be connected to the pebble coal hopper of the coal mill, the shaftless screw conveyor includes a feed pipe 20, and the negative pressure conveying device includes a negative pressure pipe 10; the first end of the connecting pipe 300 of the pneumatic acceleration chamber is connected to the feed pipe 20, and the connecting flange 220 of the connecting piece 200 of the pneumatic acceleration chamber is connected to the negative pressure pipe 10.

[0057] Specifically, the shaftless screw conveyor receives the pebble coal from the pebble coal hopper of the coal mill and transports it to the feed pipe 20, which then transports it to the pneumatic acceleration chamber. The negative pressure pipe 10 of the negative pressure conveying device has a negative pressure, which absorbs the pebble coal entering the pneumatic acceleration chamber into the negative pressure pipe 10, and then transports it to the pebble coal bin by other conveying mechanisms in the negative pressure conveying device.

[0058] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0059] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0060] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A pneumatic acceleration chamber, characterized in that: include: The acceleration chamber body includes a delivery pipe and a feed pipe, wherein the delivery pipe has an air inlet end and an outlet end, and the feed pipe has a feed end and a discharge end, wherein the discharge end is fixed to the outer peripheral surface of the delivery pipe and communicates with the interior of the delivery pipe; A connecting piece, comprising a sleeve and a connecting flange, wherein the connecting flange is arranged at one end of the sleeve, the connecting flange is used to connect with the negative pressure pipe, and the output end can be sealed and plugged into the sleeve; A connecting pipe, a first end of which is used to be connected to the feed pipe; A clamp, through which the second end of the connecting pipe and the feed end are detachably sealed and butted.

2. The pneumatic acceleration chamber according to claim 1, characterized in that: The connecting flange has a connecting hole coaxially connected to the sleeve, and the aperture of the connecting hole is smaller than the inner diameter of the sleeve, so that the connecting flange has an annular protrusion protruding from the inner wall of the sleeve along the radial direction of the sleeve, and the annular protrusion is used for the output end to abut against.

3. The pneumatic acceleration chamber according to claim 2, characterized in that: The aperture of the communicating hole is equal to the inner diameter of the conveying pipe, and the inner diameter of the sleeve is equal to the outer diameter of the conveying pipe.

4. The pneumatic acceleration chamber according to claim 2 or 3, characterized in that: A sealing ring is arranged in the sleeve, one side of the sealing ring abuts against the annular convex portion, and the other side of the sealing ring is used for the output end to abut against.

5. The pneumatic acceleration chamber according to claim 4, characterized in that: The sealing ring is a packing ring.

6. The pneumatic acceleration chamber according to claim 1, characterized in that: A first docking ring is fixed on the feed end, and a second docking ring is fixed on the second end of the connecting pipe. The first docking ring can be detachably connected to the second docking ring through the clamp, and the end face of the first docking ring can fit with the end face of the second docking ring.

7. The pneumatic acceleration chamber according to claim 6, characterized in that: The clamp is a groove type clamp.

8. The pneumatic acceleration chamber according to claim 1, characterized in that: A roller mechanism is provided at the bottom of the acceleration chamber body, and the roller mechanism is fixedly connected to the acceleration chamber body. The roller mechanism can drive the acceleration chamber body to translate, so that the output end of the conveying pipe moves horizontally and is inserted into the sleeve.

9. The pneumatic acceleration chamber according to claim 8, characterized in that: The roller mechanism includes a mounting seat and a plurality of universal rollers. The mounting seat is located below the acceleration chamber body and is fixedly connected to the delivery pipe. The plurality of universal rollers are distributed at the bottom of the mounting seat.

10. A stone coal discharge device, characterized in that: It comprises a shaftless screw conveyor, a negative pressure conveying device and a pneumatic acceleration chamber as described in any one of claims 1 to 9; The shaftless screw conveyor is used to be connected to the gravel coal hopper of the coal mill, the shaftless screw conveyor comprises a feed pipe, and the negative pressure conveying device comprises a negative pressure pipe; The first end of the connecting pipe of the pneumatic acceleration chamber is connected to the feed pipe, and the connecting flange of the connecting piece of the pneumatic acceleration chamber is connected to the negative pressure pipe.

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