A coal mine underground negative pressure, water and compressed air integrated multifunctional control valve

Abstract

The utility model relates to a kind of coal mine underground negative pressure, water and compressed air integrated multifunctional control valve, including valve body, piston assembly and outlet valve, the bottom of the valve body is evenly provided with several valve cavities, the valve cavity is divided into three groups, is waterway valve cavity group, compressed air valve cavity group and negative pressure valve cavity group, any adjacent two valve cavities in the same valve cavity group are mutually through by a through hole;The side wall of the valve body is respectively correspondingly provided with water source connecting seat, air source connecting seat and negative pressure source connecting seat communicated with valve cavity;The piston assembly is slidably arranged in the valve cavity, and air hole is formed in the top and side wall of each valve cavity;The outlet valve top end is detachably sealed and connected at the bottom of the valve cavity, and the outlet of the outlet valve top center is vertically corresponding and matched with the piston assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine equipment, in particular to a coal mine underground negative pressure, water and compressed air integrated multifunctional control valve. BACKGROUND

[0002] The coal mine underground roadway fully mechanized mining face operation mainly involves drilling, anchor rod, drilling dust removal and gas drainage construction. Among them, the coal seam wall drilling construction process mainly involves the deslagging, cooling of the drill rod and gas drainage in the drilling hole, and the coal mine underground water source, compressed air and negative pressure source are needed to be used simultaneously during the drilling process; the deslagging and cooling of the drill rod are mainly involved in the rock wall drilling process, and the underground water source and compressed air are also needed to be used; the underground compressed air and water source are needed in the drilling dust removal process, and the formed air-water jet is used for dust removal, and the underground water source and compressed air are also needed to be used; the negative pressure source is needed in the gas drainage process. In short, almost all the fully mechanized construction processes around the drilling construction in the coal mine underground need to use the underground water source, compressed air and negative pressure source to different degrees.

[0003] The existing problems in the current coal mine underground production practice are that: in the drilling construction process of the fully mechanized face, the matched water pipeline, compressed air pipeline or negative pressure pipeline need to be connected on different equipment at the same time, on the one hand, the multiple pipelines are mixed with each other, the production site is very messy, especially before and after connecting or detaching a certain pipeline or multiple pipelines, the corresponding pipelines need to be carefully checked and distinguished by the workers, which is very tedious; on the other hand, each branch pipeline drawn from the main pipeline needs to be equipped with a pipe valve, and due to the complicated pipelines, the pipe valves are often found wrong when a certain branch pipeline needs to be controlled and adjusted, which brings many inconveniences to the production construction, in addition, no matter the compressed air, water source or negative pressure branch pipe, they all carry a certain pressure, and the valve on each branch pipeline is affected by the pressure, so that the adjustment of the valve is very laborious and very inconvenient, which also brings many troubles to the production construction. SUMMARY

[0004] In order to solve the above problems, the purpose of the present application is to provide a coal mine underground negative pressure, water and compressed air integrated multifunctional control valve, which is arranged between the underground main pipeline and the multiple branch pipelines of drilling equipment, and integrates the interfaces of the multiple branch pipelines, for the centralized and unified control of the underground compressed air, negative pressure and water pipeline, the branch pipelines are distinct, which not only solves the problem of mixed and messy underground pipelines, but also synchronously solves the problem of inconvenient adjustment of the multiple branch pipe valves.

[0005] The technical scheme adopted by the present application to solve the above problems is as follows:

[0006] The utility model provides a kind of coal mine underground negative pressure, water and compressed air integrated multifunctional control valve, including valve body, piston assembly being arranged in valve body and outlet valve being arranged in the bottom of valve body, the bottom of the valve body is evenly provided with several valve cavities for assembling piston assembly along its length direction, the valve cavity is divided into three groups, is waterway valve cavity group, compressed air valve cavity group and negative pressure valve cavity group, wherein, any adjacent two valve cavities in the same valve cavity group are mutually penetrated by a through hole;

[0007] The side wall of the valve body corresponds to one of each valve cavity group, and a water source connection seat, an air source connection seat and a negative pressure source connection seat are respectively arranged corresponding to the valve cavity;

[0008] The piston assembly is slidably arranged in the valve cavity, and a gas hole is formed in the top and side wall of each valve cavity for driving the piston assembly to reciprocate up and down in the valve cavity.

[0009] The top end of the outlet valve is detachably sealed and connected to the bottom opening of the valve cavity, and the outlet in the center of the top of the outlet valve vertically corresponds and matches the piston assembly, so that after the piston assembly is displaced downward to the limit position, the top center outlet of the outlet valve is blocked to complete the sealing of the outlet valve.

[0010] As a preferred solution of the above technical solution, the valve body is in a rectangular structure, and the valve cavity is a blind hole structure cavity evenly formed in the bottom of the valve body.

[0011] As a preferred solution of the above technical solution, the piston assembly includes a T-shaped piston column and a guide ring sleeved on the T-shaped piston column, the guide ring is detachably and sealingly fixed in the valve cavity, and the guide ring is located on the upper side of the through hole to form a sealed piston chamber between the end wall of the valve cavity and the guide ring, the piston ring on the T-shaped piston column is vertically and slidably arranged in the piston chamber, and the central shaft at the bottom of the T-shaped piston column is vertically and sealingly arranged on the guide ring.

[0012] As a preferred solution of the above technical solution, the top circumference of the guide ring abuts against a step formed on the inner wall of the valve cavity to form abutting limit, and the bottom circumference of the guide ring is fixed by a snap spring assembled in the valve cavity.

[0013] The outer diameter of the central shaft at the bottom of the T-shaped piston column matches the inner diameter of the top center outlet of the outlet valve, and a sealing ring is arranged on the end circumference of the central shaft at the bottom of the T-shaped piston column, so that after the T-shaped piston column is displaced downward to the limit position, the central shaft at the bottom of the T-shaped piston column is sealingly inserted into the top center outlet of the outlet valve to complete the sealing of the outlet valve.

[0014] As a preferred scheme of the above technical solution, the waterway valve cavity group and the compressed air valve cavity group are symmetrically arranged on two sides of the valve body, and the negative pressure valve cavity group is arranged at the center of the valve body.

[0015] As a preferred scheme of the above technical solution, the waterway valve cavity group and the compressed air valve cavity group each include at least three valve cavities, and the negative pressure valve cavity group includes at least one valve cavity.

[0016] As a preferred scheme of the above technical solution, the bottom of the water source connecting seat, the compressed air source connecting seat and the negative pressure source connecting seat is detachably connected with a water inlet pipe, a compressed air inlet pipe and a negative pressure inlet pipe respectively.

[0017] As a preferred scheme of the above technical solution, the outlet valve is provided with a flow adjusting assembly for adjusting the outlet flow.

[0018] As a preferred scheme of the above technical solution, the flow adjusting assembly includes a sleeve, a shaft rod threadedly connected in the sleeve, and an adjusting cap arranged at a free end of the shaft rod, a blind hole is arranged in a side wall of the outlet valve, one end of the sleeve is horizontally threadedly connected in the blind hole, a through hole passing through the outlet valve is arranged in a bottom center of the blind hole, and one end of the shaft rod is horizontally and sealingly arranged in an outlet passage in an inner cavity of the outlet valve after passing through the through hole.

[0019] As a preferred scheme of the above technical solution, a parallel control valve is further arranged, two air holes on each valve cavity are respectively connected with multiple parallel interfaces on the parallel control valve, a branch air outlet hole is arranged on a top of the compressed air source connecting seat, and the branch air outlet hole is connected with a total air inlet interface on the parallel control valve to realize air power supply of the parallel control valve.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] Firstly, the present application is a centralized control valve, which can control the supply of compressed air, water and negative pressure in the coal mine drilling construction, and is equivalent to a total control valve, which can control various branch pipes used in the drilling process of the downhole drilling machine, thereby avoiding the complicated installation of valves and control of each branch pipe of compressed air, water and negative pressure, and improving the operation efficiency.

[0022] Secondly, through the application of the centralized control valve, the various types of connection branch pipes in the coal mine can be effectively combed, and the terminal pipe valve is no longer needed on the various types of branch pipes. The various types of branch pipes only need to be connected with the corresponding outlet of the centralized control valve at one end and connected with the equipment at the other end, so that the installation and connection of various types of pipelines are simplified, the problem of interlaced disorder of various types of pipelines does not occur again, and great convenience is provided for the underground production construction. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a front view cross-sectional structure schematic diagram of the present application;

[0024] Figure 2 It is a side view cross-sectional structure schematic diagram of the present application;

[0025] Figure 3 It is a front view cross-sectional structure schematic diagram of the present application in an initial sealing state;

[0026] Figure 4 It is a side view cross-sectional structure schematic diagram of the present application in an initial sealing state;

[0027] Figure 5 It is Figure 2 It is a local structure schematic diagram of the marked part;

[0028] Figure 6 It is an assembly structure schematic diagram of the outlet valve and the flow regulating assembly;

[0029] Figure 7 It is a structure schematic diagram of the outlet valve and the flow regulating assembly;

[0030] Figure 8 It is a three-dimensional structure schematic diagram of the present application under an angle;

[0031] Figure 9 It is a three-dimensional structure schematic diagram of the present application under an angle;

[0032] Figure 10 It is a whole structure schematic diagram of the present application.

[0033] Marked in the figure: 1, valve body, 2, outlet valve, 21, blind hole, 22, avoiding hole, 3, valve cavity, 31, through hole, 32, air hole, 33, piston chamber, 34, step, 35, clamping spring, 4, water source connecting seat, 41, water inlet pipe, 5, air source connecting seat, 51, compressed air inlet pipe, 52, branch air outlet hole, 6, negative pressure source connecting seat, 61, negative pressure inlet pipe, 7, T-shaped piston column, 8, guide ring, 9, sleeve, 10, shaft rod, 11, adjusting cap, 12, parallel control valve, 13, total air inlet interface. DETAILED DESCRIPTION

[0034] The application will be described in detail below in conjunction with specific embodiments, which are based on the technical scheme of the application, and give detailed implementation modes and specific operation processes.

[0035] As shown in the figure, the embodiment of the application provides a coal mine underground negative pressure, water and compressed air integrated multifunctional control valve, comprising a valve body 1, a piston assembly arranged in the valve body 1 and an outlet valve 2 arranged at the bottom of the valve body 1, the bottom of the valve body 1 is uniformly provided with a plurality of valve cavities 3 for assembling the piston assembly along the length direction, the valve cavities 3 are divided into three groups, which are water passage valve cavity group, compressed air valve cavity group and negative pressure valve cavity group, wherein,

[0036] Any adjacent two valve cavities 3 in the same valve cavity group are mutually penetrated through a through hole 31; the side wall of the valve body 1 is respectively provided with a water source connecting seat 4, an air source connecting seat 5 and a negative pressure source connecting seat 6 corresponding to one valve cavity 3 of each valve cavity group in communication with the valve cavity 3; the piston assembly is slidingly arranged in the valve cavity 3, and the top and side wall of each valve cavity 3 are provided with an air hole 32 for driving the piston assembly to reciprocate up and down in the valve cavity 3; the top end of the outlet valve 2 is detachably and sealingly connected at the bottom opening of the valve cavity 3, and the outlet at the top center of the outlet valve 2 vertically corresponds and matches the piston assembly, so as to block the top center outlet of the outlet valve 2 after the piston assembly is displaced downward to the limit position, thereby completing the sealing of the outlet valve 2.

[0037] In this embodiment, as shown in Figure 8 , 9 , the valve body 1 is in the form of a rectangular seat body structure, the valve cavities 3 are in the form of blind hole structure cavities uniformly provided at the bottom of the valve body 1, the top end surface of the valve body 1 is provided with an upper air hole corresponding to each valve cavity 3, and the side wall of the valve body 1 is provided with a side air hole corresponding to each valve cavity 3, the upper air hole and the side air hole on the same valve cavity 3 are connected to the air source respectively, for pneumatically driving the piston assembly in the valve cavity 3 to slide up and down, so as to further realize the sealing or opening of the outlet valve 2 by the piston assembly.

[0038] In this embodiment, on the one hand, regarding the structure of the valve cavities 3 and the valve cavity groups:

[0039] As shown in Figures 1-4As shown, in each valve chamber 3, a cavity for accommodating water, compressed air, or negative pressure is formed between the top of the outlet valve 2 and the bottom of the piston assembly. Any two adjacent valve chambers 3 in the same valve chamber group are interconnected. The through hole 31 is provided on the side wall of the cavity in each valve chamber 3, so that multiple cavities in the same valve chamber group are interconnected. After water, compressed air, or negative pressure is sent into the cavity, each valve chamber 3 in the same group can independently achieve uninterrupted supply of water, compressed air, or negative pressure by opening and closing its own outlet valve 2. To put it more simply, the interconnection of the cavities in multiple valve chambers 3 in the same valve chamber group is equivalent to a main inlet pipeline for a water source, compressed air source, or negative pressure source. The outlet valve 2 connected to the bottom of each valve chamber 3 is equivalent to multiple branch pipes on this main inlet pipeline. Opening any outlet valve 2 can realize the supply of water, compressed air, or negative pressure source to the branch pipeline.

[0040] On the other hand, regarding the opening and closing control of outlet valve 2:

[0041] As described above, each valve chamber 3 is equipped with a corresponding piston assembly, and the valve body 1 is provided with an air hole 32 for driving the piston assembly to move at each valve chamber 3, specifically as follows: Figures 1-4 As shown, compressed air is connected to the air vents 32 to pneumatically drive the piston assembly. The up-and-down movement of the piston assembly can be linked with the outlet at the top of the outlet valve 2. Under normal conditions, the outlet valve 2 is in a sealed state. At this time, the piston assembly is pushed down to its limit position, and the bottom of the piston assembly can just seal the outlet at the top of the outlet valve 2, thereby sealing the outlet of the cavity in the valve chamber 3, making the cavity in a sealed state, thus achieving the sealing of the outlet of the valve chamber 3. In the working state, one of the outlet valves 2 is connected to the supply pipe. At this time, it is only necessary to control the piston assembly to push it up to the limit position, and the piston assembly can disengage from the sealing state of the pipe opening at the top of the outlet valve 2, and the outlet valve 2 will then open. Water, compressed air or negative pressure in the cavity can be discharged from the outlet valve 2, thus realizing the supply of water, compressed air or negative pressure at that outlet.

[0042] Furthermore, regarding the structure of the piston assembly and how it achieves a seal on outlet valve 2:

[0043] like Figures 1-5 As shown, the piston assembly includes a T-shaped piston post 7 and a guide ring 8 sleeved on the T-shaped piston post 7. The guide ring 8 is detachably and sealedly fixed in the valve chamber 3, and the guide ring 8 is located on the upper side of the through hole 31 to form a sealed piston chamber 33 between the end wall of the valve chamber 3 and the guide ring 8. The piston ring on the T-shaped piston post 7 is vertically and slidably disposed in the piston chamber 33, and the central axis at the bottom of the T-shaped piston post 7 is vertically and sealedly disposed on the guide ring 8.

[0044] In the above structure, the outer diameter of the guide ring 8 matches the inner diameter of the valve cavity 3, and a sealing ring is arranged at the contact position between the two, the top circumference of the guide ring 8 abuts against the step 34 arranged on the inner wall of the valve cavity 3 to form abutting limit, and the bottom circumference of the guide ring 8 is limited and fixed by a snap spring 35 assembled in the valve cavity 3, so as to fix the guide ring 8 in the valve cavity 3; the T-shaped piston column 7, as its name implies, includes two parts, i.e. an upper piston ring, the outer diameter of which matches the inner diameter of the valve cavity 3 and is in contact with the inner wall of the valve cavity 3 through a sealing ring, and a lower central shaft located at the center of the piston ring, the outer diameter of the central shaft at the bottom of the T-shaped piston column 7 matches the inner diameter of the top central outlet of the outlet valve 2, the central shaft is arranged on the guide ring 8, and the bottom end of the central shaft further extends to a position close to the outlet valve 2, and a sealing ring is arranged on the end circumference of the central shaft at the bottom of the T-shaped piston column 7, so that after the T-shaped piston column 7 is displaced downward to the limit position, the central shaft at the bottom of the T-shaped piston column 7 is inserted into the top central outlet of the outlet valve 2 to complete the sealing of the outlet valve 2, and conversely, when the T-shaped piston column is lifted upward, the bottom end of the central shaft is separated from the outlet valve 2 to release the sealing state, so that a passage is formed between the cavity in the valve cavity 3 and the outlet valve 2.

[0045] Briefly, the position of the guide ring 8 is relatively fixed, and after being fixed in the valve cavity 3, the position does not change, and the T-shaped piston column 7 is driven by the pneumatic pressure of the two air holes 32 arranged on the top end plate to move up and down in the valve cavity 3, and in this state, the central shaft at the bottom of the T-shaped piston column 7 shuttles in the guide ring 8, and the bottom end of the central shaft simultaneously realizes sealing and separation between the top outlet of the outlet valve 2, thereby completing the opening and closing structure of the air hole of the top outlet of the outlet valve 2.

[0046] The guide ring 8 has two functions: first, it serves as a sealing end cover in the valve cavity 3, which divides the valve cavity 3 into two parts, i.e. a gas cavity on the upper side for the gas to enter to drive the movement of the T-shaped piston column 7, and a cavity on the lower side for containing water, compressed air or negative pressure as described above; second, it serves as a sliding guide for the T-shaped piston column 7, which ensures that the T-shaped piston column 7 can realize good sealing and separation with the outlet valve 2 at the bottom thereof, and realizes the pneumatic opening and closing of the outlet valve 2.

[0047] In addition, the connection structure of the water source, the compressed air source and the negative pressure source is as follows:

[0048] As Figure 1 , 8As shown in Figs. 9 and 10, one valve cavity 3 at the side of each valve cavity group is integrally connected with a connecting seat passing through the valve cavity 3, i.e. the water source connecting seat 4, the compressed air source connecting seat 5 and the negative pressure source connecting seat 6, and the three connecting seats correspond to a joint for installing a connecting pipe. The bottom of each connecting seat is detachably connected with an inlet pipe, i.e. the water source inlet pipe 41, the compressed air source inlet pipe 51 and the negative pressure source inlet pipe 61. One end of each inlet pipe is connected with the corresponding connecting seat, and the other end is connected with a branch interface on the water source, compressed air source and negative pressure source main pipeline laid in the coal mine, so as to supply the water source, compressed air source and negative pressure source into the valve cavity 3.

[0049] In addition, in order to further facilitate the adjustment, a flow regulating assembly is integrated on each outlet valve 2, which can regulate the outlet flow and speed of each outlet valve 2, so as to replace the technical status of setting a pipe valve on each branch pipeline in the prior art, that is, the flow regulating assembly on the outlet valve 2 can directly realize the adjustment of the water source, compressed air source or negative pressure source supply flow and supply rate of each branch pipe, and the problem of "incorrectly opening the pipe valve" will not occur in practice.

[0050] Regarding the structure of the flow regulating assembly, specifically:

[0051] Referring to Figs. 9 and 10, Figure 6 and 7 the flow regulating assembly comprises a sleeve 9, a shaft 10 threadedly connected in the sleeve 9 and an adjusting cap 11 arranged at the free end of the shaft 10. A blind hole 21 is formed in the side wall of the outlet valve 2, one end of the sleeve 9 is horizontally threadedly connected in the blind hole 21, a through hole 22 passing through the outlet valve 2 is formed in the center of the bottom of the blind hole 21, and one end of the shaft 10 is horizontally and sealingly inserted into the outlet passage in the inner cavity of the outlet valve 2 after passing through the through hole 22.

[0052] The outer diameter of the shaft 10 is consistent with the inner diameter of the outlet passage in the inner cavity of the outlet valve 2, and an inner recessed step corresponding to the shaft 10 can be further arranged on the inner wall of the outlet passage of the outlet valve 2. After the shaft 10 is horizontally rotated to the limit position, the end of the shaft 10 can be just arranged in the inner recessed step, so as to realize the complete sealing of the outlet passage in the outlet valve 2. In the working state, only the rotation length of the shaft 10 in the outlet passage of the outlet valve 2 needs to be adjusted, so as to realize the flow regulation of the outlet valve 2.

[0053] It is additionally explained that regarding the setting structure of the water valve cavity group, the compressed air valve cavity group and the negative pressure valve cavity group:

[0054] Referring to Figs. 9 and 10, Figure 1 , 3As shown, this embodiment adopts a symmetrical structure, that is, the water valve chamber group and the compressed air valve chamber group are symmetrically arranged on both sides of the valve body 1, and the negative pressure valve chamber group is located at the center of the valve body 1. At the same time, both the water valve chamber group and the compressed air valve chamber group include at least three valve chambers 3, and the negative pressure valve chamber group includes at least one valve chamber 3. This arrangement structure and the number of valve chambers in each valve chamber group can be freely selected, including but not limited to the above-mentioned configuration, and set according to the actual production needs. However, in general, the water circuit and compressed air are used more frequently and multiple devices need to be used simultaneously, so the number of valve chambers corresponding to the water circuit and compressed air can be set to more, while the negative pressure is generally only used for gas extraction, so the number of valve chambers is set to one to meet the needs.

[0055] Finally, regarding the assembly and working principle of the central control valve described in this invention:

[0056] like Figure 10 As shown, in operation, the central control valve is equipped with a parallel control valve 12. The parallel control valve 12 serves as the main control switch and is mainly used to control the start and stop movement of the piston assembly in each valve chamber 3. Specifically, the two air holes 32 on each valve chamber 3 are respectively connected to the multi-way parallel interface on the parallel control valve 12. The top of the air source connection seat 5 is provided with a branch air outlet 52, which is connected to the main air inlet 13 on the parallel control valve 12 to achieve air supply. In this way, by operating the corresponding pneumatic control switch on the parallel control valve 12, the opening and closing of the corresponding pipeline outlet valve 2 can be completed.

[0057] As for the working principle, it has been described in relatively detail above. In addition, it should be noted that during use, first turn on the corresponding control switch on the parallel control valve 12, and then rotate the shaft 10 to adjust the outlet flow of the outlet valve 2.

[0058] Finally, the application scenarios of the central control valve described in this invention in practical construction are listed below:

[0059] Taking the centralized control valve described in the embodiment of the present invention as an example, there are three pipelines corresponding to the compressed air and water source, respectively denoted as air path 1, air path 2 and air path 3; water path 1, water path 2 and water path 3; and one negative pressure source.

[0060] During the drilling process, the air passage 1 can be connected to the tail end of the drill rod, mainly used to send compressed air into the central through hole of the drill rod. Its function is to discharge the coal slag and coal powder in the borehole, thus playing the role of slag removal.

[0061] Airway 2 can be simultaneously connected to pneumatically driven equipment on the drilling rig, such as pneumatic motors, to provide pneumatic power;

[0062] The air path 3 can be connected to the drilling rig blowout prevention dust removal device synchronously, and the device is connected to the water source at the same time to form a high-speed air-water jet for dust removal at the drilling position during drilling;

[0063] The water path 1 can be connected to the circulating cooling device on the drilling rig to play a cooling role as circulating cooling water;

[0064] During the rock hole drilling process of the drilling rig, the water path 2 can be connected to the tail end of the drill rod for cooling and slag removal of the drill rod;

[0065] The water path 3 can be used for slurry preparation for hole sealing and other devices requiring water sources, such as the blowout prevention dust removal device described above.

[0066] The negative pressure pipeline is directly connected to the tail end of the drill rod for gas extraction during drilling.

[0067] The above structure can basically meet almost all construction operation scenes in the existing coal mine underground construction. Of course, several standby pipelines can be added on the basis of the above pipeline to meet the use needs of unexpected situations.

[0068] The device described in the application has been used in practice for many times, and the effect is very good, and is suitable for popularization and use.

[0069] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been described as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification of the above-mentioned technical content within the scope of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A coal mine underground negative pressure, water and compressed air integrated multifunctional control valve, characterized in that: The utility model provides a valve body (1), piston assembly and outlet valve (2) set in valve body (1) are set in the bottom of valve body (1), the bottom of valve body (1) is evenly provided with a plurality of valve cavities (3) for assembling piston assembly along its length direction, the valve cavity (3) is divided into three groups, is waterway valve cavity group, pressure air valve cavity group and negative pressure valve cavity group respectively, wherein, The valve body (1) is rectangular structure, the valve cavity (3) is the cavity of blind hole structure that is evenly provided in the bottom of valve body (1), the valve cavity (3) is the cavity of blind hole structure that is evenly provided in the bottom of valve body (1), Any adjacent two valve cavities (3) in the same valve cavity group are mutually through by a through hole (31), The side wall of valve body (1) corresponds one valve cavity (3) of each valve cavity group respectively and is correspondingly provided with water source connecting seat (4), air source connecting seat (5) and negative pressure source connecting seat (6) that communicate with valve cavity (3), The piston assembly is slidably arranged in the valve cavity (3), and a gas hole (32) is formed in the top and side wall of each valve cavity (3) for driving the piston assembly to reciprocate in the valve cavity (3). The outlet valve (2) is detachably and sealingly connected to the bottom opening of the valve cavity (3), and the outlet at the top center of the outlet valve (2) is vertically corresponding and matched with the piston assembly, so that the top center outlet of the outlet valve (2) is blocked after the piston assembly is displaced downward to the limit position, thereby sealing the outlet valve (2). The piston assembly includes a T-shaped piston column (7) and a guide ring (8) sleeved on the T-shaped piston column (7), the guide ring (8) is detachably and sealingly arranged in the valve cavity (3), and the guide ring (8) is located on the upper side of the through hole (31) to form a sealed piston chamber (33) between the end wall of the valve cavity (3) and the guide ring (8), the piston ring on the T-shaped piston column (7) is slidably arranged in the piston chamber (33), and the central shaft at the bottom of the T-shaped piston column (7) is vertically and sealingly arranged on the guide ring (8).

2. The integrated multifunctional control valve for negative pressure, water and compressed air in a coal mine according to claim 1, characterized in that: The top circumference of the guide ring (8) abuts against the step (34) arranged on the inner wall of the valve cavity (3) to form an abutting limit, and the bottom circumference of the guide ring (8) is limited and fixed by a snap spring (35) arranged in the valve cavity (3). The outer diameter of the central shaft at the bottom of the T-shaped piston column (7) is matched with the inner diameter of the top center outlet of the outlet valve (2), and a sealing ring is arranged on the end circumference of the central shaft at the bottom of the T-shaped piston column (7), so that the central shaft at the bottom of the T-shaped piston column (7) is sealingly inserted into the top center outlet of the outlet valve (2) after the T-shaped piston column (7) is displaced downward to the limit position, thereby sealing the outlet valve (2).

3. The integrated multifunctional control valve for negative pressure, water and compressed air in a coal mine according to claim 1, characterized in that: The waterway valve cavity group and the pressure air valve cavity group are symmetrically arranged on the two sides of the valve body (1), and the negative pressure valve cavity group is located at the center of the valve body (1).

4. The integrated multifunctional control valve for negative pressure, water and compressed air in a coal mine according to claim 1, characterized in that: The waterway valve cavity group and the pressure air valve cavity group each include not less than three valve cavities (3), and the negative pressure valve cavity group includes at least one valve cavity (3).

5. The integrated multifunctional control valve for negative pressure, water and compressed air in a coal mine according to claim 1, characterized in that: The bottom of the water source connecting seat (4), the air source connecting seat (5) and the negative pressure source connecting seat (6) is respectively detachably connected with a water inlet pipe (41), an air inlet pipe (51) and a negative pressure inlet pipe (61).

6. The integrated multifunctional control valve for negative pressure, water and compressed air in a coal mine according to claim 1, characterized in that: The outlet valve (2) is provided with a flow adjusting assembly for adjusting the outlet flow.

7. The integrated multifunctional control valve for negative pressure, water and compressed air in a coal mine according to claim 6, characterized in that: The flow adjusting assembly comprises a sleeve (9), a shaft (10) threadedly connected in the sleeve (9) and an adjusting cap (11) arranged at the free end of the shaft (10), a blind hole (21) is formed in the side wall of the outlet valve (2), one end of the sleeve (9) is horizontally threadedly connected in the blind hole (21), a through hole (22) passing through the outlet valve (2) is formed in the center of the bottom of the blind hole (21), and one end of the shaft (10) is horizontally and sealingly inserted into an outlet passage in the inner cavity of the outlet valve (2) through the through hole (22).

8. The integrated multifunctional control valve for negative pressure, water and compressed air in a coal mine according to claim 1, characterized in that: Parallel control valves (12) are further included, two air holes (32) on each valve cavity (3) are respectively connected with multiple parallel interfaces on the parallel control valves (12), a branch air outlet hole (52) is arranged at the top of the air source connecting seat (5), the branch air outlet hole (52) is connected with a total air inlet interface (13) on the parallel control valve (12) to realize air power supply for the parallel control valve (12).

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