A single pump brake device

Abstract

This invention discloses a single-unit pump braking device, relating to the field of geological exploration drilling rig technology. It includes a coupling, a clutch, a pump-connected universal joint, a main air circuit, and a control air circuit. The coupling includes a coupling output shaft and a charging / adjusting valve. The coupling output shaft is the power output part of the independent pump unit, and the charging / adjusting valve is the coupling speed regulating device. By modifying the clutch friction plates, clutch hub, and clutch air bladder, installing a pneumatic control valve, and modifying the entire air circuit, the pump shutdown time of the single-unit pump unit is significantly shortened to meet actual working conditions. Simultaneously, the desired braking condition can be selected according to actual working conditions, effectively achieving safe and rapid well control operations, effectively reducing well control risks, and ensuring well control safety.

Description

Technical Field

[0001] This patent relates to the field of geological exploration drilling rig technology, and in particular to a single pump group control device for a petroleum geological exploration drilling rig. Background Technology

[0002] In single-unit pump sets used in oil geological exploration drilling rigs, the diesel engine provides power to drive the mud pump via a hydraulic coupling, pressurizing the drilling fluid before pumping it into the wellbore. However, in actual use, it has been found that in certain special circumstances, when the well needs to be shut down immediately due to downhole complexity, the single-unit pump set cannot stop the pump in a timely manner. The reason for this is that the charging and regulating valve controlling the power output of the hydraulic coupling requires a long time from initial activation to complete disconnection of power output, which poses a significant safety threat to downhole safety and personnel safety.

[0003] The current independent pump unit achieves the purpose of driving the mud pump with diesel engine power through the connection of diesel engine-pin coupling-coupler input shaft, coupler output shaft-universal shaft-mud pump drive shaft. However, due to the characteristics of the coupling, this method cannot stop the pump in time when the diesel engine stops.

[0004] The prior art includes a Chinese invention patent document with publication number CN107288542A and publication date of October 24, 2017. The technical solution disclosed in this patent document is as follows:

[0005] This invention relates to the technical field of drilling rig transmission system devices, and is an automatic inertial braking device for a drilling rig transmission system. It includes a base, a power unit, and an inertial braking clutch. The power unit is mounted on the base, and the inertial braking clutch includes an inertial braking driving component and an inertial braking driven component. The power output shaft of the power unit is connected to the inertial braking driving component, and the inertial braking driven component is fixedly mounted on the base. This invention has a reasonable and compact structure. By using the inertial braking clutch in conjunction with the transmission clutch, it can achieve rapid braking of the friction wheel without affecting the power unit's transmission to the transmission clutch. It features good braking effect and long service life.

[0006] This invention, by using the inertial brake clutch in conjunction with the transmission clutch, enables rapid braking of the friction wheel without affecting the transmission of the power unit to the transmission clutch. It features good braking effect and long service life. Although this invention discloses an automatic inertial brake device for a drilling rig transmission system, the device has the problem of inconvenient adjustment of braking, and cannot adjust the braking situation according to the needs of the situation. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this patent proposes a single-pump braking device that significantly shortens the downtime of a single pump unit, meets the needs of actual working conditions, and allows for selection of the desired braking mode based on actual working conditions.

[0008] This invention is achieved by adopting the following technical solution:

[0009] A single-unit pump braking device includes a coupling, a clutch, a universal joint with a pump, a main air circuit, and a control air circuit;

[0010] The coupling includes a coupling output shaft and a charging / adjusting valve. The coupling output shaft is located at one end of the coupling, and the charging / adjusting valve is located on the coupling.

[0011] The clutch includes a clutch hub, a clutch air chamber, and clutch friction plates. The clutch hub is mounted on and fixed to the output shaft of the coupling. The clutch air chamber and clutch friction plates are both located inside the clutch. The clutch friction plates are mounted above the clutch hub and are concentric with the clutch hub.

[0012] The pump universal joint is fixed to the clutch steel hub;

[0013] The main air circuit includes a first air intake pipe and a relay. The relay is installed in the middle of the first air intake pipe. The end of the first air intake pipe is connected to the air inlet of the airbag. The control air circuit includes a second air intake pipe, a three-position four-way air control valve, a pump start control air pipe, and a brake control air pipe. The end of the second air intake pipe is connected to the three-position four-way air control valve. The heads of the pump start control air pipe and the brake control air pipe are connected to the three-position four-way air control valve. The end of the pump start control air pipe is connected to the charging and adjusting valve, and the end of the brake control air pipe is connected to the relay.

[0014] Furthermore, a coupling base is provided below the coupling, and the clutch is disposed on the coupling base.

[0015] Furthermore, the clutch is provided with a clutch bracket, which is disposed on both sides of the clutch air chamber and the clutch friction plate.

[0016] Furthermore, a clutch housing is fixed on the clutch bracket.

[0017] Furthermore, the clutch housing is fixed to the clutch bracket by connecting bolts.

[0018] Furthermore, the clutch also includes a clutch riser seat, and the clutch bracket is fixed on the clutch riser seat.

[0019] Furthermore, the clutch riser is welded to the coupling base.

[0020] Furthermore, the clutch steel hub is fixed to the coupling output shaft by a shaft head pressure plate and fixing bolts.

[0021] Furthermore, the universal joint with pump is fixed to the clutch hub by connecting bolts.

[0022] Furthermore, the three-position four-way pneumatic control valve is installed in the driller's operating room.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. This invention provides a single-unit pump braking device. In this invention, the coupling output shaft is the power output part of an independent pump unit, and the charging and adjusting valve is the coupling speed regulating device. By setting the clutch friction plates, clutch hub, and clutch air bladder, installing a pneumatic control valve, and modifying the entire air circuit, the pump stop time of the single-unit pump unit is significantly shortened to meet the actual working conditions. At the same time, the desired braking condition can be selected according to the actual working conditions. When the three-position four-way pneumatic control valve is in the left "pump engaged" position, the control air circuit is connected to the coupling charging and adjusting valve. At this time, the clutch air bladder is in the deflated state, the friction plates and hub are separated, the coupling operates normally, the diesel engine power is transmitted to the mud pump, and the mud pump operates. When the three-position four-way pneumatic control valve is in the left "pump engaged" position, the control air circuit is connected to the coupling charging and adjusting valve. At this time, the clutch air bladder is in the deflated state, the friction plates and hub are separated, the coupling operates normally, and the diesel engine power is transmitted to the mud pump, and the mud pump operates. When the valve is in the neutral "pump stop" position, the coupling charging valve cuts off the air supply, gradually cutting off the diesel engine power, and the mud pump slowly stops. When the three-position four-way pneumatic control valve is in the right "brake" position, the control air circuit opens the relay, and the main air circuit quickly inflates the clutch air bladder, causing the clutch friction plates to grip the clutch steel hub in a short time, quickly offsetting the remaining inertia of the diesel engine and coupling, achieving the purpose of braking and quickly stopping the pump. The design is ingenious and easy to adjust, effectively realizing safe and rapid well control operations, effectively reducing well control risks, ensuring well control safety, without changing the original transmission structure of the independent pump unit, and without affecting the transmission strength and efficiency. At the same time, after the braking device is initially installed, it does not need to be disassembled and can be moved as a whole with the independent pump unit.

[0025] 2. In this invention, a coupling base is provided below the coupling, and the clutch is located on the coupling base, so that the braking device is located on the coupling base, which facilitates the overall relocation of the independent pump unit.

[0026] 3. In this invention, the clutch is provided with a clutch bracket, which is located on both sides of the clutch air chamber and the clutch friction plate to fix the clutch hub, clutch air chamber and clutch friction plate in the clutch, making the entire device structure more stable and having higher safety performance.

[0027] 4. In this invention, the clutch housing is fixed to the clutch bracket by connecting bolts, which facilitates installation and disassembly, and allows for the repair and replacement of the clutch steel hub, clutch air chamber and clutch friction plate inside the clutch.

[0028] 5. In this invention, a clutch housing is fixed on the clutch bracket to protect the clutch hub, clutch air chamber and clutch friction plate in the clutch, prevent external conditions from affecting the inside of the clutch, and further improve the safety performance of the entire device structure.

[0029] 6. In this invention, the clutch also includes a clutch riser seat, and the clutch bracket is fixed on the clutch riser seat. The height of the clutch can be adjusted through the clutch riser seat, which facilitates the installation of the device and improves the stability of the device.

[0030] 7. In this invention, the clutch riser seat is welded to the coupling base, which increases the stability of the device and reduces the impact of vibration on the device.

[0031] 8. In this invention, the clutch steel hub is fixed to the coupling output shaft by a shaft head pressure plate and fixing bolts. This arrangement makes the clutch steel hub connection more stable and convenient to disassemble and install.

[0032] 9. In this invention, the universal joint with pump is fixed to the clutch steel hub by connecting bolts. This arrangement provides a stable connection and facilitates disassembly and installation.

[0033] 10. In this invention, a three-position four-way pneumatic control valve is installed in the driller's operating room, which allows for direct control and adjustment of the single-pump braking device from the driller's operating room, further enabling safe and rapid well control operations, effectively reducing well control risks, and ensuring well control safety. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0035] Figure 1 This is a schematic diagram of the device structure in Embodiment 2 of the present invention;

[0036] Figure 2 This is a schematic diagram of the layout of a single pump unit when the present invention is used.

[0037] Marked in the image:

[0038] 1. Coupling; 11. Coupling output shaft; 12. Shaft head pressure plate; 13. Fixing bolt; 14. Coupling base; 15. Charging and regulating valve; 2. Clutch; 21. Clutch steel hub; 22. Clutch riser seat; 23. Clutch bracket; 24. Clutch housing; 25. Clutch air bag; 251. Air bag inlet; 26. Clutch friction plate; 27. Connecting bolt; 3. Universal joint with pump; 4. Main air passage; 41. First air inlet pipe; 42. Relay air valve; 5. Control air passage; 51. Second air inlet pipe; 52. Three-position four-way air control valve; 53. Pump start control air pipe; 54. Brake control air pipe; 6. Diesel engine; 7. Mud pump. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0040] Unless otherwise defined, the technical or scientific terms used in this invention should be understood in their ordinary sense by one of ordinary skill in the art to which this invention pertains. The terms "comprising" or "including," and similar words used in this invention disclosure, mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0042] Example 1

[0043] As a preferred embodiment of the present invention, a single-pump braking device is provided, including a coupling 1, a clutch 2, a universal joint with a pump 3, a main air passage 4, and a control air passage 5.

[0044] The coupling 1 includes a coupling output shaft 11 and a charging and adjusting valve 15. The coupling output shaft 11 is located at one end of the coupling 1, and the charging and adjusting valve 15 is located on the coupling 1.

[0045] Clutch 2 includes clutch hub 21, clutch air bag 25 and clutch friction plate 26. Clutch hub 21 is mounted on and fixed on coupling output shaft 11. Clutch air bag 25 and clutch friction plate 26 are both located inside clutch 2. Clutch friction plate 26 is mounted above clutch hub 21 and concentric with clutch hub 21.

[0046] The pump universal joint is fixed on the clutch steel hub 21;

[0047] The main air path 4 includes a first air intake pipe 41 and a relay air device 42. The relay air device 42 is installed in the middle of the first air intake pipe 41. The end of the first air intake pipe 41 is connected to the airbag inlet 251. The control air path 5 includes a second air intake pipe 51, a three-position four-way air control valve 52, a pump start control air pipe 53, and a brake control air pipe 54. The end of the second air intake pipe 51 is connected to the three-position four-way air control valve 52. The heads of the pump start control air pipe 53 and the brake control air pipe 54 are connected to the three-position four-way air control valve 52. The end of the pump start control air pipe 53 is connected to the charging valve 15, and the end of the brake control air pipe 54 is connected to the relay air device 42.

[0048] In this embodiment, the coupling output shaft 11 is the power output part of the independent pump unit, and the charging and regulating valve 15 is the speed regulating device of the coupling 1. By setting the clutch friction plate 26, clutch steel hub 21 and clutch air bag 25, installing the air control valve, and modifying the entire air circuit, the pump stop time of the single pump unit is greatly shortened to meet the actual working conditions. At the same time, the desired braking condition can be selected according to the actual working conditions. The design is ingenious and easy to adjust, which can effectively realize safe and fast well control operations, effectively reduce well control risks, and ensure well control safety. It does not change the original transmission structure of the independent pump unit and does not affect the transmission strength and efficiency. In addition, after the braking device is initially installed, it does not need to be disassembled and can be moved with the independent pump unit as a whole.

[0049] After on-site modification and implementation, the test results show that, compared with the original structure, the pump stop time of the single pump unit with the added braking device is significantly shortened, meeting the actual working conditions.

[0050] Table 1. Brake Test Statistics

[0051]

[0052] When a spill occurs downhole, shutting off the single pump operation control air circuit and engaging the inertial brake device can effectively control the pump shutdown time, achieving a shutdown time of approximately 3 seconds. This allows the driller to promptly and effectively shut down the well, effectively preventing trapping pressure, reducing drilling fluid spillage, and lowering shut-in casing pressure. This enables safe and rapid well control operations, effectively reducing well control risks and ensuring well control safety.

[0053] Example 2

[0054] As another preferred embodiment of the present invention, please refer to the appendix to the specification. Figure 1 A single-pump braking device is provided, including a coupling 1, a clutch 2, a universal joint with a pump 3, a main air passage 4, and a control air passage 5.

[0055] The coupling 1 includes a coupling base 14, a coupling output shaft 11, and a charging and adjusting valve 15. The coupling output shaft 11 is located at one end of the coupling 1, the charging and adjusting valve 15 is located on the coupling 1, and the coupling 1 is located on the coupling base 14.

[0056] The clutch 2 includes a clutch bracket 23, a clutch housing 24, a clutch riser seat 22, a clutch hub 21, a clutch air chamber 25, and a clutch friction plate 26. The clutch hub 21 is mounted on the coupling output shaft 11 and fixed by a shaft head pressure plate 12 and fixing bolts 13. The clutch air chamber 25 and the clutch friction plate 26 are both located inside the clutch 2. The clutch friction plate 26 is mounted above the clutch hub 21 and is concentric with the clutch hub 21. The clutch bracket 23 is located on both sides of the clutch air chamber 25 and the clutch friction plate 26. The clutch bracket 23 is fixed on the clutch riser seat 22. The clutch housing 24 is fixed on the clutch bracket 23 by connecting bolts 27. The clutch riser seat 22 is welded to the coupling base 14.

[0057] The universal joint 3 with pump is fixed to the clutch hub 21 by connecting bolts 27;

[0058] The main air circuit 4 includes a first air inlet pipe 41 and a relay air device 42. The relay air device 42 is installed in the middle of the first air inlet pipe 41. The end of the first air inlet pipe 41 is connected to the air inlet 251 of the air bag. The control air circuit 5 includes a second air inlet pipe 51, a three-position four-way air control valve 52, a pump start control air pipe 53, and a brake control air pipe 54. The end of the second air inlet pipe 51 is connected to the three-position four-way air control valve 52. The heads of the pump start control air pipe 53 and the brake control air pipe 54 are connected to the three-position four-way air control valve 52. The three-position four-way air control valve 52 is installed in the driller's operating room. The end of the pump start control air pipe 53 is connected to the charging valve 15. The end of the brake control air pipe 54 is connected to the relay air device 42.

[0059] This embodiment allows for direct control and adjustment of the single-pump braking device from the driller's cab, further enabling safe and rapid well control operations. It effectively reduces well control risks, ensures well control safety, and features high stability and safety performance. Installation, maintenance, and disassembly are convenient and quick, as are transportation.

[0060] Example 3

[0061] As another preferred embodiment of the present invention, a single pump braking device is provided, including a coupling 1, a clutch 2, a universal joint with a pump 3, a main air passage 4 and a control air passage 5.

[0062] The coupling 1 includes a coupling base 14, a coupling output shaft 11, and a charging and adjusting valve 15. The coupling output shaft 11 is located at one end of the coupling 1, the charging and adjusting valve 15 is located on the coupling 1, and the coupling 1 is located on the coupling base 14.

[0063] Clutch 2 includes clutch bracket 23, clutch housing 24, clutch hub 21, clutch air chamber 25, and clutch friction plate 26. Clutch hub 21 is mounted on and fixed to the output shaft 11 of the coupling. Clutch air chamber 25 and clutch friction plate 26 are both located inside clutch 2. Clutch friction plate 26 is mounted above clutch hub 21 and concentric with clutch hub 21. Clutch bracket 23 is located on both sides of clutch air chamber 25 and clutch friction plate 26. Clutch housing 24 is fixed on clutch bracket 23. Clutch 2 is located on coupling base 14.

[0064] The universal joint 3 with pump is fixed on the clutch steel hub 21;

[0065] The main air circuit 4 includes a first air inlet pipe 41 and a relay air device 42. The relay air device 42 is installed in the middle of the first air inlet pipe 41. The end of the first air inlet pipe 41 is connected to the air inlet 251 of the air bag. The control air circuit 5 includes a second air inlet pipe 51, a three-position four-way air control valve 52, a pump start control air pipe 53, and a brake control air pipe 54. The end of the second air inlet pipe 51 is connected to the three-position four-way air control valve 52. The heads of the pump start control air pipe 53 and the brake control air pipe 54 are connected to the three-position four-way air control valve 52. The three-position four-way air control valve 52 is installed in the driller's operating room. The end of the pump start control air pipe 53 is connected to the charging valve 15. The end of the brake control air pipe 54 is connected to the relay air device 42.

[0066] This embodiment allows for direct control and adjustment of the single-pump braking device from the driller's cab, further enabling safe and rapid well control operations. It effectively reduces well control risks and ensures well control safety. It also possesses certain stability and safety performance, and is convenient and quick to transport.

[0067] Example 4

[0068] As another preferred embodiment of the present invention, a single-pump braking device is provided, including a coupling 1, a clutch 2, a universal joint with a pump 3, a main air passage 4 and a control air passage 5.

[0069] The coupling 1 includes a coupling base 14, a coupling output shaft 11, and a charging and adjusting valve 15. The coupling output shaft 11 is located at one end of the coupling 1, the charging and adjusting valve 15 is located on the coupling 1, and the coupling 1 is located on the coupling base 14.

[0070] The clutch 2 includes a clutch bracket 23, a clutch riser seat 22, a clutch hub 21, a clutch air chamber 25, and a clutch friction plate 26. The clutch hub 21 is mounted on the coupling output shaft 11 and fixed by a shaft head pressure plate 12 and fixing bolts 13. The clutch air chamber 25 and the clutch friction plate 26 are both located inside the clutch 2. The clutch friction plate 26 is mounted above the clutch hub 21 and is concentric with the clutch hub 21. The clutch bracket 23 is located on both sides of the clutch air chamber 25 and the clutch friction plate 26. The clutch bracket 23 is fixed on the clutch riser seat 22, and the clutch riser seat 22 is welded to the coupling base 14.

[0071] The universal joint 3 with pump is fixed to the clutch hub 21 by connecting bolts 27;

[0072] The main air path 4 includes a first air intake pipe 41 and a relay air device 42. The relay air device 42 is installed in the middle of the first air intake pipe 41. The end of the first air intake pipe 41 is connected to the airbag inlet 251. The control air path 5 includes a second air intake pipe 51, a three-position four-way air control valve 52, a pump start control air pipe 53, and a brake control air pipe 54. The end of the second air intake pipe 51 is connected to the three-position four-way air control valve 52. The heads of the pump start control air pipe 53 and the brake control air pipe 54 are connected to the three-position four-way air control valve 52. The end of the pump start control air pipe 53 is connected to the charging valve 15, and the end of the brake control air pipe 54 is connected to the relay air device 42.

[0073] This embodiment enables safe and rapid well control operations, effectively reducing well control risks and ensuring well control safety. It has good stability and safety performance, and is convenient and quick to install, maintain and disassemble, as well as to transport.

[0074] Example 5

[0075] As another preferred embodiment of the present invention, a single-pump braking device is provided, including a coupling 1, a clutch 2, a universal joint with a pump 3, a main air passage 4 and a control air passage 5.

[0076] The coupling 1 includes a coupling output shaft 11 and a charging and adjusting valve 15. The coupling output shaft 11 is located at one end of the coupling 1, and the charging and adjusting valve 15 is located on the coupling 1.

[0077] The clutch 2 includes a clutch hub 21, a clutch air bladder 25, and a clutch friction plate 26. The clutch hub 21 is mounted on the coupling output shaft 11 and fixed by a shaft head pressure plate 12 and fixing bolts 13. The clutch housing 24 is fixed to the clutch bracket 23 by connecting bolts 27. The clutch air bladder 25 and the clutch friction plate 26 are both located inside the clutch 2. The clutch friction plate 26 is mounted above the clutch hub 21 and is concentric with the clutch hub 21. The clutch bracket 23 is located on both sides of the clutch air bladder 25 and the clutch friction plate 26. The clutch bracket 23 is fixed to the clutch riser seat 22. The clutch housing 24 is fixed to the clutch bracket 23 by connecting bolts 27.

[0078] The universal joint 3 with pump is fixed on the clutch steel hub 21;

[0079] The main air circuit 4 includes a first air inlet pipe 41 and a relay air device 42. The relay air device 42 is installed in the middle of the first air inlet pipe 41. The end of the first air inlet pipe 41 is connected to the air inlet 251 of the air bag. The control air circuit 5 includes a second air inlet pipe 51, a three-position four-way air control valve 52, a pump start control air pipe 53, and a brake control air pipe 54. The end of the second air inlet pipe 51 is connected to the three-position four-way air control valve 52. The heads of the pump start control air pipe 53 and the brake control air pipe 54 are connected to the three-position four-way air control valve 52. The three-position four-way air control valve 52 is installed in the driller's operating room. The end of the pump start control air pipe 53 is connected to the charging valve 15. The end of the brake control air pipe 54 is connected to the relay air device 42.

[0080] This embodiment allows for direct control and adjustment of the single-pump braking device from the driller's cab, further enabling safe and rapid well control operations. It features good stability and safety performance, and is convenient and quick to install, maintain, and disassemble.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A single pump brake apparatus, characterized by, It comprises a coupling (1), a clutch (2), a pump universal shaft (3), a main gas path (4) and a control gas path (5). The coupling (1) comprises a coupling output shaft (11) and a charge regulating valve (15), the coupling output shaft (11) is arranged at one end of the coupling (1), and the charge regulating valve (15) is arranged on the coupling (1). The clutch (2) comprises a clutch steel hub (21), a clutch air bag (25) and a clutch friction plate (26), the clutch steel hub (21) is sleeved on the coupling output shaft (11) and fixed, the clutch air bag (25) and the clutch friction plate (26) are both arranged inside the clutch (2), and the clutch friction plate (26) is installed above the clutch steel hub (21) and concentric with the clutch steel hub (21). The pump universal shaft is fixed on the clutch steel hub (21). The main gas path (4) comprises a first air inlet pipe (41) and a relay valve (42), the relay valve (42) is installed in the middle of the first air inlet pipe (41), the end of the first air inlet pipe (41) is connected with the air bag air inlet (251), the control gas path (5) comprises a second air inlet pipe (51), a three-position four-way air control valve (52), a pump starting control gas pipe (53) and a brake control gas pipe (54), the end of the second air inlet pipe (51) is connected with the three-position four-way air control valve (52), the heads of the pump starting control gas pipe (53) and the brake control gas pipe (54) are connected with the three-position four-way air control valve (52), the end of the pump starting control gas pipe (53) is connected with the charge regulating valve (15), and the end of the brake control gas pipe (54) is connected with the relay valve (42).

2. A brake device for a single pump according to claim 1, characterized in that The coupling (1) is provided below with a coupling base (14), and the clutch (2) is arranged on the coupling base (14).

3. A single pump brake apparatus as defined in claim 2, wherein, The clutch (2) is provided with a clutch support (23), and the clutch support (23) is arranged on both sides of the clutch air bag (25) and the clutch friction plate (26).

4. A pump brake assembly according to claim 3, wherein, The clutch support (23) is fixed with a clutch shell (24).

5. A pump brake assembly according to claim 4, wherein, The clutch shell (24) is fixed on the clutch support (23) through a connecting bolt (27).

6. A brake assembly for a single pump as defined in claim 3, wherein, The clutch (2) further comprises a clutch lifting seat (22), and the clutch support (23) is fixed on the clutch lifting seat (22).

7. A pump brake assembly according to claim 6, wherein, The clutch lifting seat (22) is welded on the coupling base (14).

8. A brake assembly for a single pump as defined in claim 1, wherein, The clutch steel hub (21) is fixed on the coupling output shaft (11) through a shaft head pressing plate (12) and a fixing bolt (13).

9. A brake assembly for a single pump as defined in claim 1, wherein, The pump universal shaft (3) is fixed on the clutch steel hub (21) through a connecting bolt (27).

10. A brake device for a single pump according to any one of claims 1 to 9, characterized in that, The three-position four-way air control valve (52) is installed in a driller's operation room.

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