A composite high-pressure cement grouting control device

Abstract

A compound high-pressure cement grouting control device, which comprises a pressure regulating handwheel, a valve rod, a valve body, an upper end cover, a lower end cover, a seal, a pressure ring I, a pressure ring II, a bushing, a valve seat and a protective sleeve; one side of the valve body is provided with a grout inlet, and the other side is provided with a grout outlet; the top of the valve body is provided with an upper end cover, and the bottom is provided with a lower end cover; the upper end of the valve rod is connected to the pressure regulating handwheel, and the lower end of the valve rod passes through the upper valve cover and penetrates into the inner cavity of the valve body; the inner cavity of the valve body is successively provided with a pressure ring I, a pressure ring II, a seal, a bushing, a valve seat and a protective sleeve from top to bottom, the lower end of the valve rod is successively sleeved with a pressure ring I, a pressure ring II, a seal and a bushing from top to bottom, and the lower end of the valve rod is connected to the valve seat arranged in the valve body; the valve seat is fixed at the lower part of the inner cavity of the valve body, and "U"-shaped grout outlets are symmetrically arranged on both sides of the valve seat; a protective sleeve is arranged below the valve seat. This control device can effectively and accurately control the grouting pressure, and fully avoid the safety risks brought by the sudden rise and fall of pressure caused by the blockage of the high-pressure grouting valve.

Description

Technical Field:

[0001] The present invention belongs to the technical field of building construction, particularly to the technical field of high-pressure cement grouting, and specifically relates to a compound high-pressure cement grouting control device. Background Art:

[0002] Currently, for the existing high-pressure cement grouting valves in the domestic and international markets, during the control of grouting pressure, especially in the high-pressure grouting stage, the pressure control is all interval pressure control; there has been no breakthrough in the precise control of the high-pressure grouting stage of cement grouting for decades. During this period, the high-pressure cement grouting valves have been updated several times, and neither the pressure control effect, safety, nor cost performance has been effectively solved; the precise control is even less capable. For example, if the grouting pressure is 5 Mpa, the grouting pressure has been in a fluctuation range of 4.5 - 5.5 Mpa or even larger. Especially due to factors such as the circulating slurry in the hole wrapping rock debris, the high-pressure control valve is partially or completely blocked, resulting in phenomena such as a sudden increase in pressure or even the bursting of the high-pressure grouting pipe; in the case of existing great safety hazards, the stability of the grouting system is also reduced and the failure rate of the grouting system is increased. At the same time, it has a great impact on the grouting quality, as well as other defects and risks.

[0003] In the prior art, a V-shaped structure is mostly used between the valve stem and the valve seat of the high-pressure valve for sealing slurry and boosting pressure. Due to the lack of an effective channel for reserving large-particle mixed slurry and effective pressure reduction measures, situations such as unstable pressure control (i.e., regional control of pressure) and serious damage to the valve body occur. Summary of the Invention:

[0004] The problem to be solved by the present invention is to provide a compound high-pressure cement grouting control device according to the above deficiencies. This control device can effectively achieve precise control of the grouting pressure and fully avoid the safety risks brought by the sudden rise and fall of pressure caused by the blockage of the high-pressure grouting valve.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a composite high-pressure cement grouting control device, which includes a pressure regulating handwheel, a valve stem, a valve body, an end cover, a seal, a pressure ring, a bushing, a valve seat, and a protective sleeve. The end cover includes an upper end cover and a lower end cover, and the pressure ring includes a pressure ring I and a pressure ring II. An inner cavity is provided in the valve body. An inlet slurry port is arranged on one side of the valve body, and an outlet slurry port is arranged on the other side. The inlet slurry port and the outlet slurry port are communicated with the inner cavity of the valve body. The upper end cover is fixedly installed at the top of the valve body, and the lower end cover is fixedly installed at the bottom of the valve body. The upper end of the valve stem is fixedly connected with the pressure regulating handwheel, and the lower end of the valve stem passes through the valve stem installation hole on the upper valve cover and penetrates into the inner cavity of the valve body. In the inner cavity of the valve body, a pressure ring I, a pressure ring II, a seal, a bushing, a valve seat, and a protective sleeve are sequentially arranged from top to bottom. The valve stem is located at the lower end of the inner cavity of the valve body and is sequentially sleeved with a pressure ring I, a pressure ring II, a seal, and a bushing from top to bottom. The lower end of the valve stem passes through the upper end cover and is connected with the valve seat arranged in the valve body. The valve seat is fixed at the lower part of the inner cavity of the valve body, and "U"-shaped outlet slurry ports are symmetrically arranged on both sides of the valve seat. A protective sleeve is arranged below the valve seat.

[0007] The inlet slurry port and the outlet slurry port are symmetrically arranged on both sides of the valve body respectively, and the inlet slurry port is higher than the outlet slurry port.

[0008] The upper valve cover and the valve body are fixedly connected together by threads, and the external threads at the top of the valve body match the internal threads of the valve body installation hole in the upper end cover.

[0009] The lower valve cover and the valve body are fixedly connected together by threads, and the external threads at the top of the lower end cover match the internal threads of the lower end cover installation hole at the lower part of the valve body.

[0010] The pressure regulating handwheel is fixed at the top end of the valve stem by bolts.

[0011] The external threads of the valve stem match the internal threads of the valve stem installation hole on the upper end cover.

[0012] The diameter of the lower end of the valve stem matches the diameter of the inner cavity hole of the valve seat.

[0013] The valve seat is welded at the lower part of the inner cavity of the valve body.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The valve stem support of the traditional high-pressure valve is a single support. Under high pressure, since there is no support at the front end of the valve stem, the valve stem will tremble, causing pressure fluctuations. The valve stem support of the present invention is a single support under low pressure and a double support under high pressure. When under high pressure, the front end valve stem enters the valve seat to form a second support, effectively avoiding the trembling of the valve stem under high pressure and improving the pressure stability.

[0016] 2. The flow-through surfaces of the valve stem and valve seat of traditional high-pressure valves are in the form of an annular cross-section. At high pressure, the flow-through surface is in the form of an annular line, and the passing performance of particulate matter in the slurry is poor, making it very easy to become blocked, resulting in a sudden increase in pressure. The flow-through surfaces of the valve stem and valve seat of the present invention are in the form of an annular plus U-shaped at low pressure and U-shaped at high pressure. At high pressure, for the same flow area, the passing performance of the U-shaped cross-section for particulate matter is better, it is not easily blocked, the pressure is more stable, and the pressure regulation is more sensitive and light.

[0017] 3. The slurry of traditional high-pressure valves enters from the bottom end of the valve seat. After being boosted by the valve seat and valve stem, it is shot into the valve cavity at high speed, causing damage to the valve stem and valve body. The slurry of the present invention flows from the valve cavity to the protective sleeve at the lower end of the valve seat. The slurry is in a static pressure state in the valve cavity, which will not damage the valve stem and valve body. After being boosted by the valve seat, it is shot into the valve seat at high speed from two U-shaped holes of the valve seat. When the slurry flows into the valve seat, the two streams of slurry impact each other, which can not only avoid the damage of the high-pressure slurry to the valve seat and achieve the effect of preliminary energy dissipation, but also make the particles of the slurry further separated under the action of mutual impact, making the stability of the slurry better. The slurry that has undergone preliminary energy dissipation through the counter-jet then enters the energy dissipation pool for further energy dissipation before being discharged.

[0018] 4. The valve stem of traditional high-pressure valves is sealed with a VF sealing ring, which causes relatively large wear to the valve stem and has poor sealing performance. The valve stem of the present invention is sealed with a new type of seal, which causes less wear to the valve stem and has better sealing performance.

[0019] In summary, during the cement grouting process, due to the characteristics of particulate grouting materials and the grouting method of in-hole circulation, conventional high-pressure valves only control the pressure within a certain range. The present invention adopts a double-seat high-pressure grouting control device, which can effectively achieve precise control of the grouting pressure, can control the pressure at a certain point, realizes the control of the grouting pressure from a surface to a point. During the high-pressure grouting process, the pressure is continuously stable, the pressure regulation accuracy is 0.01 Mpa, and the pressure fluctuation range is only ±0.1 Mpa. It fully avoids the safety risks and quality hazards brought by the sudden rise and fall of pressure caused by the blockage of conventional high-pressure grouting valves, thereby improving the effective utilization of the grouting pump, greatly reducing the failure rate of the grouting pump, directly reducing the construction cost, improving the construction quality, efficiency and safety reliability, and increasing the enterprise benefits. Brief Description of the Drawings:

[0020] Figure 1 is the structural schematic diagram of the present invention;

[0021] Figure 2 is the cross-sectional structural schematic diagram of the present invention;

[0022] Figure 3 is the structural schematic diagram of the valve seat of the present invention;

[0023] Figure 4 is the structural schematic diagram of the protective sleeve of the present invention.

[0024] Reference numerals in the drawings:

[0025] 1 - Pressure regulating handwheel, 2 - Valve stem, 3 - Upper end cover, 4 - Pressure ring I, 5 - Pressure ring II, 6 - Valve body, 7 - Seal, 8 - Bushing, 9 - Valve seat, 10 - Protective sleeve, 11 - Lower end cover. Specific embodiments:

[0026] The present invention will be further described below in conjunction with specific embodiments. The specific embodiments are further explanations of the principles of the present invention and do not limit the present invention in any way. The same or similar technologies to the present invention do not exceed the scope of protection of the present invention.

[0027] See Figures 1 - 4 , the present invention provides a composite high - pressure cement grouting control device. The control device mainly consists of components such as a pressure regulating handwheel 1, a valve stem 2, a valve body 6, end covers, a seal 7, pressure rings, a bushing 8, a valve seat 9, and a protective sleeve 10. The end covers include an upper end cover 3 and a lower end cover 11, and the pressure rings include a pressure ring I 4 and a pressure ring II 5. An inner cavity is provided in the valve body 6. An inlet slurry port is provided on one side of the valve body 6, and an outlet slurry port is provided on the other side. The inlet slurry port and the outlet slurry port are symmetrically arranged on both sides of the valve body 6 respectively, and the inlet slurry port is higher than the outlet slurry port. The inlet slurry port and the outlet slurry port communicate with the inner cavity of the valve body 6. The upper end cover 3 is fixedly installed at the top of the valve body 6, and the lower end cover 11 is fixedly installed at the bottom. The upper valve cover 3 and the lower valve cover 11 are fixedly connected to the valve body 6 by threads. The external thread at the top of the valve body 6 matches the internal thread of the valve body installation hole in the upper end cover 3, and the external thread at the top of the lower end cover 11 matches the internal thread of the lower end cover installation hole at the lower part of the valve body 6. The upper end of the valve stem 2 is fixedly connected to the pressure regulating handwheel 1. The pressure regulating handwheel 1 is fixed to the top of the valve stem 2 by bolts, and the rotation of the pressure regulating handwheel 1 drives the up - and - down movement of the valve stem 2. The lower end of the valve stem 2 passes through the valve stem installation hole of the upper valve cover 3 and penetrates into the inner cavity of the valve body 6. The external thread of the valve stem 2 matches the internal thread of the valve stem installation hole of the upper end cover 3, and the valve stem 2 and the upper end cover 3 form a thread fit that can move axially along the valve stem 2. In the inner cavity of the valve body 6, a pressure ring I 4, a pressure ring II 5, a seal 7, a bushing 8, a valve seat 9, and a protective sleeve 10 are arranged in sequence from top to bottom. The lower end of the valve stem 2 is sleeved with a pressure ring I 4, a pressure ring II 5, a seal 7, and a bushing 8 in sequence from top to bottom. The lower end of the valve stem 2 passes through the upper end cover 3 and is connected to the valve seat 9 arranged in the valve body 6. The diameter of the lower end of the valve stem 2 matches the inner cavity hole diameter of the valve seat 9, and the lower end head of the valve stem 2 can be inserted into the inner cavity hole of the valve seat 9. The valve seat 9 is fixedly welded to the lower part of the inner cavity of the valve body 6. "U" - shaped outlet slurry ports are symmetrically arranged on both sides of the valve seat 9, and a protective sleeve 10 is arranged below the valve seat 9.

[0028] In the low-pressure state, the valve of this compound high-pressure cement grouting control device is fully open, and this stage is a single-seat state; in the high-pressure state, the valve is half-open, and the cement slurry flows in from the "U"-shaped opening. At this time, the valve stem 2 enters the valve seat 9 with a "U"-shaped slurry outlet, and this stage is a double-seat state. The "U"-shaped slurry outlets are respectively arranged on both sides of the valve seat 9 in a symmetric layout. When the slurry flows into the valve seat 9, they impact each other, which can not only avoid the damage of the high-pressure slurry to the valve seat 9 and achieve the effect of energy dissipation, but also enable the particles of the slurry to be further separated under the action of mutual impact, making the stability of the slurry better. Since the slurry enters the valve seat 9 from the "U"-shaped slurry outlets respectively, the slurry channel is unobstructed, and there will be no situation of blockage caused by some particulate matter entering the high-pressure control device, resulting in sudden pressure changes; effectively solving the problem of the stability of the grouting pressure, the pressure regulation accuracy is 0.01 Mpa, and the pressure fluctuation range is only ±0.1 Mpa.

Claims

1. A composite high-pressure cement grouting control device, which includes a pressure regulating handwheel (1), a valve stem (2), a valve body (6), end caps, a seal (7), a pressure ring, a bushing (8), a valve seat (9), and a protective sleeve (10). The end caps include an upper end cap (3) and a lower end cap (11), and the pressure ring includes a pressure ring I (4) and a pressure ring II (5); there is an inner cavity in the valve body (6), and its characteristics are: One side of the valve body (6) of the control device is provided with a slurry inlet, and the other side is provided with a slurry outlet. The slurry inlet and the slurry outlet are symmetrically arranged on both sides of the valve body (6) respectively. The slurry inlet is higher than the slurry outlet, and the slurry inlet and the slurry outlet communicate with the inner cavity of the valve body (6); the upper end cover (3) is fixedly installed at the top of the valve body (6), and the lower end cover (11) is fixedly installed at the bottom. The upper end cover (3) is fixedly connected to the valve body (6) by threads. The external threads on the top of the valve body (6) match the internal threads of the valve body installation hole in the upper end cover (3); the upper end of the valve stem (2) is fixedly connected with a pressure regulating handwheel (1), and the lower end of the valve stem (2) passes through the valve stem installation hole on the upper end cover (3) and penetrates into the inner cavity of the valve body (6); in the inner cavity of the valve body (6), a pressure ring I (4), a pressure ring II (5), a seal (7), a bushing (8), a valve seat (9), and a protective sleeve (10) are arranged in sequence from top to bottom. The valve stem (2) in the lower part of the inner cavity of the valve body (6) is sleeved with a pressure ring I (4), a pressure ring II (5), a seal (7), and a bushing (8) in sequence from top to bottom. The lower end of the valve stem (2) passes through the upper end cover (3) and is connected to the valve seat (9) arranged in the valve body (6); the valve seat (9) is fixed at the lower part of the inner cavity of the valve body (6), and "U"-shaped slurry outlets are symmetrically arranged on both sides of the valve seat (9); a protective sleeve (10) is arranged below the valve seat (9).

2. The composite high-pressure cement grouting control device according to claim 1, characterized in that: The lower end cover (11) is fixedly connected to the valve body (6) by threads. The external threads on the top of the lower end cover (11) match the internal threads of the lower end cover installation hole in the lower part of the valve body (6).

3. A composite high-pressure cement grouting control device according to claim 1, characterized in that: The pressure regulating handwheel (1) is fixed to the top end of the valve stem (2) by bolts.

4. A composite high-pressure cement grouting control device according to claim 1, characterized in that: The external threads of the valve stem (2) match the internal threads of the valve stem installation hole of the upper end cover (3).

5. A composite high-pressure cement grouting control device according to claim 1, characterized in that: The diameter of the lower end of the valve stem (2) matches the inner cavity hole diameter of the valve seat (9).

6. The composite high-pressure cement grouting control device according to claim 1, wherein: The valve seat (9) is welded to the lower part of the inner cavity of the valve body (6).

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