阅读说明：本技术 一种水轮机蜗壳水推力补偿结构 (Spiral case water thrust compensation structure of hydraulic turbine ) 是由 熊建军 邓鑫 代继江 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种水轮机蜗壳水推力补偿结构,包括沿水流方向依次连接的球阀下游延伸段、蜗壳法兰,还包括力平衡法兰,所述力平衡法兰与所述球阀下游延伸段可拆卸式连接,所述力平衡法兰与所述蜗壳法兰连接,所述力平衡法兰与所述球阀下游延伸段之间具有空腔,所述球阀下游延伸段上开设有进水孔,所述进水孔从所述球阀下游延伸段外表面延伸至空腔。本发明解决了现有技术存在的球阀上游压力管道系统与蜗壳断开式连接、蜗壳水推力不能传递到上游压力管道系统上,因此需要重复设置牢固的蜗壳基础等问题。(The invention discloses a water turbine volute water thrust compensation structure which comprises a ball valve downstream extension section, a volute flange and a force balance flange, wherein the ball valve downstream extension section and the volute flange are sequentially connected along a water flow direction, the force balance flange is detachably connected with the ball valve downstream extension section, the force balance flange is connected with the volute flange, a cavity is formed between the force balance flange and the ball valve downstream extension section, a water inlet hole is formed in the ball valve downstream extension section, and the water inlet hole extends to the cavity from the outer surface of the ball valve downstream extension section. The invention solves the problems that in the prior art, the ball valve upstream pressure pipeline system is in disconnected connection with the volute, and the volute water thrust cannot be transmitted to the upstream pressure pipeline system, so that a firm volute foundation needs to be repeatedly arranged, and the like.)

1. The utility model provides a hydraulic turbine spiral case water thrust compensation structure, includes ball valve low reaches extension section (6), spiral case flange (1) that connect gradually along the rivers direction, its characterized in that still includes power balance flange (4), power balance flange (4) with ball valve low reaches extension section (6) detachable connection, power balance flange (4) with spiral case flange (1) are connected, power balance flange (4) with cavity (9) have between ball valve low reaches extension section (6), inlet opening (10) have been seted up on ball valve low reaches extension section (6), inlet opening (10) are followed ball valve low reaches extension section (6) surface extends to cavity (9).

2. The water turbine volute thrust compensation structure of claim 1, wherein the position of the force balance flange (4) is adaptively adjustable.

3. The spiral casing water thrust compensation structure of the water turbine as claimed in claim 2, wherein the length of the force balance flange (4) perpendicular to the water flow direction is adjustable, so that the pressure bearing area of the force balance flange (4) perpendicular to the water flow direction is changed to control the magnitude of the transmitted water thrust.

4. The turbine volute water thrust compensation structure of any of the claims 1 to 3, wherein the force balance flange (4) is rigidly connected with the volute flange (1).

5. The water turbine volute thrust compensation structure of claim 4, further comprising connecting bolts (2), wherein the force balance flange (4) is connected with the volute flange (1) through the connecting bolts (2).

6. The water turbine volute thrust compensation structure of claim 5, further comprising a distance spacer (3) disposed between the force balance flange (4) and the volute flange (1).

7. The spiral casing water thrust compensation structure of the water turbine according to claim 6, wherein the connecting bolt (2) is sequentially inserted through the force balance flange (4), the distance sleeve (3) and the spiral casing flange (1).

8. The turbine volute water thrust compensation structure of claim 7, further comprising a first seal (57) disposed at a contact of the force balancing flange (4) and the ball valve downstream extension (6).

9. The water turbine volute thrust compensation structure of claim 8, further comprising a second seal (8) disposed at a contact point of the ball valve downstream extension (6) and the volute flange (1).

10. The turbine volute thrust compensation structure of claim 9, wherein the first seal member (57) and the second seal member (8) are both adjustable packing rings.

Technical Field

The invention relates to the technical field of water turbines, in particular to a spiral case water thrust compensation structure of a water turbine.

Background

The typical arrangement of the water turbine system is as follows: the system comprises an upstream reservoir, a pressure pipeline system, a ball valve downstream extension section and a volute.

When the ball valve is closed, the ball valve is subjected to water thrust and is transmitted to the upstream pressure piping system. When the ball valve is opened, water flows through, and the volute is under the action of water thrust. The water thrust to the volute and ball valve is theoretically consistent. In the prior art, the following method is mainly adopted to connect the ball valve downstream extension section and the volute.

Mode 1: the volute and the downstream extension section of the ball valve are not provided with a connecting flange, and are directly welded and connected with each other through steel pipes in a construction site. To facilitate ball valve removal and to allow the ball valve to move freely in the direction of water flow, a loose flange connection is provided separately on the downstream extension of the ball valve near the ball valve side to ensure that the ball valve foundation 101 does not bear the water thrust load in the direction of water flow.

Mode 2: the downstream extension section of the ball valve is directly connected with the volute by a loose flange. The ball valve is convenient to disassemble and can freely move in the water flow direction, and no water thrust is applied to the ball valve foundation 101.

The ball valve upstream pressure pipeline system and the volute are in disconnected connection in the above mode, so that the ball valve can move freely when the temperature changes and the ball valve is disassembled and assembled, the volute water thrust cannot be transmitted to the upstream pressure pipeline system in the connection mode, a firm volute foundation needs to be set independently, and the thrust foundation which is already set on the pressure pipeline system cannot be used.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a water turbine volute water thrust compensation structure, which solves the problems that in the prior art, the upstream pressure pipeline system of a ball valve is in disconnected connection with a volute, and the volute water thrust cannot be transmitted to the upstream pressure pipeline system, so that a firm volute foundation needs to be repeatedly arranged, and the like, and the free movement of the ball valve along the water flow direction is not influenced.

The technical scheme adopted by the invention for solving the problems is as follows:

the utility model provides a hydraulic turbine spiral case water thrust compensation structure, includes ball valve low reaches extension section, the spiral case flange that connects gradually along the rivers direction, still includes the balanced flange of power, the balanced flange of power with the ball valve low reaches extension section is detachable to be connected, the balanced flange of power with spiral case flange joint, the balanced flange of power with the ball valve low reaches has the cavity between the extension section, the inlet opening has been seted up on the ball valve low reaches extension section, the inlet opening is followed ball valve low reaches extension section surface extends to the cavity.

When the pressure balance flange works, pressure water enters the cavity through the water inlet hole, and the cavity has pressure, so that the pressure balance flange is subjected to water pressure opposite to the water flow direction. Through reasonable structure and size setting, as long as ensure that the water pressure opposite to the water flow direction that the force balance flange receives is the same as the water pressure the same with the water flow direction that the spiral case flange received. Two forces with equal magnitude and opposite directions acting on the volute are mutually offset, and the volute is not subjected to the acting force in the water flow direction any more. Because the pressure of the pressurized water in the cavity exerts a force in the same direction on the downstream extension of the ball valve, this force is transmitted through the ball valve to the upstream pressure piping system because the ball valve base 101 does not carry the load in the direction of the water flow.

According to the invention, through the force balance flange, the water thrust borne by the volute is completely transmitted to the pressure pipeline system under the conditions of not changing the structural design of the pressure pipeline system, the water turbine volute and the ball valve, not increasing the base load and not influencing the maintenance principle. The invention provides a water thrust compensation structure of a water turbine volute, which indirectly transmits the water thrust of the volute to a downstream extension section of a ball valve, and finally, a pressure pipeline system at the upstream of the ball valve bears the water thrust of the volute.

As a preferred technical solution, the position of the force balance flange can be adaptively adjusted.

The water pressure opposite to the water flow direction and the water pressure in the same direction as the water flow direction, which are applied to the force balance flange, are equal to each other by adjusting the position of the force balance flange, so that the adjustment is convenient, and the reliability of the invention is improved.

As a preferable technical scheme, the length of the force balance flange perpendicular to the water flow direction is adjustable, so that the bearing area of the force balance flange perpendicular to the water flow direction is changed, and the size of the transmitted water thrust is controlled.

The position of the force balance flange is adjusted to further realize that the water pressure opposite to the water flow direction and the water pressure in the same direction as the water flow direction and applied to the volute flange are equal, so that the adjustment is convenient, and the reliability of the invention is further improved.

Preferably, the force compensation flange is rigidly connected to the volute flange.

The rigid connection further ensures the transmission of force, so that the invention has more stable function and further improves the reliability.

As a preferable technical scheme, the spiral casing device further comprises a connecting bolt, and the force balance flange is connected with the spiral casing flange through the connecting bolt.

The bolt connection is convenient to debug, and the operability of the invention is improved.

As a preferable technical scheme, the spiral casing device further comprises a distance sleeve arranged between the force balance flange and the spiral casing flange.

The distance spacer is also called as a positioning spacer, which is beneficial to further ensuring the position fixation of the force balance flange and the volute flange, so that the structure of the invention is firm.

As a preferred technical scheme, the connecting bolt sequentially penetrates through the force balance flange, the distance spacer bush and the volute flange.

The rigid connection between the force balance flange and the volute flange is further ensured, so that the structure of the volute is firmer.

As a preferred technical solution, the ball valve further comprises a first sealing member arranged at the contact position of the force balance flange and the downstream extension section of the ball valve.

This facilitates prevention of leakage of pressurized water, facilitates improvement of the effective action of the force balance, and facilitates improvement of the service life of the present invention.

As a preferred technical solution, the device further comprises a second sealing member arranged at the contact position of the downstream extension section of the ball valve and the volute flange.

The water thrust compensation structure is characterized in that the ball valve is provided with a ball valve downstream extension section, the ball valve downstream extension section is provided with a volute flange, the volute flange is provided with a water inlet, the ball valve downstream extension section is provided with a water outlet, the water outlet is provided with a water outlet, and the water outlet is provided with a water outlet.

As a preferable technical solution, the first sealing element and the second sealing element are both sealing rings with adjustable compression amount.

The sealing ring has good sealing effect and is convenient to install; and the adjustable compression amount is convenient for reducing abrasion and prolonging the service life of the first sealing element and the second sealing element.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the invention, through the force balance flange, under the conditions that the structural design of a pressure pipeline system, a water turbine volute and a ball valve is not changed, the basic load is not increased, and the maintenance principle is not influenced, the water thrust borne by the volute is completely transmitted to the pressure pipeline system; the invention provides a water thrust compensation structure of a water turbine volute, which is characterized in that the water thrust of the volute is indirectly transmitted to a downstream extension section of a ball valve, and finally the water thrust of the volute is borne by an upstream pressure pipeline system of the ball valve;

(2) the invention is more convenient to realize that the water pressure opposite to the water flow direction and the water pressure in the same direction as the water flow direction and applied to the volute flange are equal by adjusting the position of the force balance flange, the adjustment is convenient, and the reliability of the invention is improved;

(3) the force balance flange is rigidly connected with the volute flange, so that the force transmission is further ensured, the function of the invention is more stable, and the reliability is further improved;

(4) the force balance flange is connected with the volute flange through the connecting bolt, so that the bolt connection and debugging are convenient, and the operability of the invention is improved;

(5) the invention is beneficial to further ensuring the position fixation of the force balance flange and the volute flange, so that the structure of the invention is firm;

(6) the invention is beneficial to further ensuring the rigid connection between the force balance flange and the volute flange, so that the structure of the invention is firmer;

(7) the invention is convenient for preventing the leakage of pressure water, is beneficial to improving the effective action of force balance and is convenient for prolonging the service life of the invention;

(8) the invention is beneficial to preventing pressure water from entering the water thrust compensation structure through the contact part of the downstream extension section of the ball valve and the volute flange to cause pressure interference, and simultaneously preventing the pressure water and impurities in the water from influencing the service life of the water thrust compensation structure;

(9) the sealing ring has good sealing effect and is convenient to install; and the adjustable compression amount is convenient for reducing abrasion and prolonging the service life of the first sealing element and the second sealing element.

Drawings

FIG. 1 is a schematic structural diagram of a water turbine system;

FIG. 2 is a cross-sectional view taken along plane A-A of FIG. 1;

FIG. 3 is an enlarged partial view of the area S of FIG. 1 in accordance with the present invention;

FIG. 4 is an enlarged view of a portion of the area S of FIG. 1 according to one of the prior art;

fig. 5 is a partial enlarged view of the region S in fig. 1 according to a second prior art.

Reference numbers and corresponding part names in the drawings: 1. volute flange, 2, connecting bolt, 3, distance spacer sleeve, 4, force balance flange, 5, bottom sealing piece, 6, ball valve downstream extension section, 7, top sealing piece, 8, second sealing piece, 9, cavity, 10, inlet opening, 12, fixation nut, 13, sliding flange plate, 14, stainless steel seal seat, 15, fixation flange plate, 57, first sealing piece, 100, ball valve, 101, ball valve base, 102, ball valve landing leg, 103, sliding lubricating layer.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.

It should be noted that the components of the present invention, such as the fixing nut 12, the sliding flange plate 13, the stainless steel seal seat 14, the fixing flange plate 15, the first seal 57, the ball valve 100, the ball valve base 101, the ball valve leg 102, and the sliding lubrication layer 103, belong to the prior art or are not the key innovation points of the present invention, and mainly for showing the differences between the prior art and the present invention, the structures and the operating principles thereof are not further described.

Example 1

As shown in fig. 1 to 5, a water turbine volute water thrust compensation structure includes a ball valve downstream extension section 6, a volute flange 1, and a force balance flange 4, where the force balance flange 4 is detachably connected to the ball valve downstream extension section 6, the force balance flange 4 is connected to the volute flange 1, a cavity 9 is formed between the force balance flange 4 and the ball valve downstream extension section 6, a water inlet 10 is formed in the ball valve downstream extension section 6, and the water inlet 10 extends from an outer surface of the ball valve downstream extension section 6 to the cavity 9.

In operation, pressurized water enters the cavity 9 through the inlet opening 10, and the cavity 9 is pressurized, so that the force-equalizing flange 4 is subjected to a water pressure in the opposite direction to the water flow (in this embodiment, to the left). Through reasonable structure and size setting, as long as ensure that the water pressure that the force balance flange 4 received is opposite with the water flow direction (this embodiment is left) and the water pressure that volute flange 1 received is the same with the water flow direction (this embodiment is right) are the same. Two forces with equal magnitude and opposite directions acting on the volute are mutually offset, and the volute is not subjected to the acting force in the water flow direction any more. Since the pressurized water in the cavity 9 has a pressure, a force in the same direction of the water flow (in this embodiment, to the right) is applied to the downstream extension 6 of the ball valve, and since the ball valve base 101 does not bear the load in the direction of the water flow, this force is transmitted through the ball valve to the upstream pressure piping.

According to the invention, through the force balance flange 4, the water thrust borne by the volute is completely transmitted to the pressure pipeline system under the conditions of not changing the structural design of the pressure pipeline system, the water turbine volute and the ball valve, not increasing the base load and not influencing the maintenance principle. The invention provides a water thrust compensation structure of a water turbine volute, which indirectly transmits the water thrust of the volute to a downstream extension section 6 of a ball valve, and finally, a pressure pipeline system at the upstream of the ball valve bears the water thrust of the volute.

As a preferred technical solution, the position of the force balance flange 4 can be adaptively adjusted.

The water pressure opposite to the water flow direction (leftward in the embodiment) borne by the force balance flange 4 is equal to the water pressure in the same water flow direction (rightward in the embodiment) borne by the volute casing flange 1, so that the adjustment is convenient, and the reliability of the invention is improved.

As a preferable technical solution, the length of the force balance flange 4 perpendicular to the water flow direction is adjustable, so that the pressure-bearing area of the force balance flange 4 perpendicular to the water flow direction is changed, and the magnitude of the transmitted water thrust is controlled.

This further facilitates the adjustment of the position of the force balance flange 4 to achieve that the water pressure of the force balance flange 4 in the direction opposite to the water flow (in this embodiment, leftward) is equal to the water pressure of the volute flange 1 in the direction same as the water flow (in this embodiment, rightward), which facilitates the adjustment and further increases the reliability of the present invention.

Example 2

As shown in fig. 1 to fig. 5, as a further optimization of embodiment 1, this embodiment includes all the technical features of embodiment 1, and in addition, this embodiment further includes the following technical features:

as a preferred solution, the force compensation flange 4 is rigidly connected to the volute flange 1.

The rigid connection further ensures the transmission of force, so that the invention has more stable function and further improves the reliability.

As a preferable technical solution, the spiral case flange further comprises a connecting bolt 2, and the force balance flange 4 is connected with the spiral case flange 1 through the connecting bolt 2.

The bolt connection is convenient to debug, and the operability of the invention is improved.

As a preferable technical solution, the spiral casing further comprises a distance sleeve 3 arranged between the force balance flange 4 and the spiral casing flange 1.

The distance spacer 3 is also called as a positioning spacer, which is beneficial to further ensuring the position fixation of the force balance flange 4 and the volute flange 1, so that the structure of the invention is firm.

As a preferred technical scheme, the connecting bolt 2 sequentially penetrates through the force balance flange 4, the distance spacer 3 and the volute flange 1.

The rigid connection between the force balance flange 4 and the volute flange 1 is further ensured, so that the structure of the invention is firmer.

As a preferred technical solution, the ball valve further comprises a first sealing member 57 arranged at the contact position of the force balance flange 4 and the ball valve downstream extension section 6.

This facilitates prevention of leakage of pressurized water, facilitates improvement of the effective action of the force balance, and facilitates improvement of the service life of the present invention. Preferably, as shown in fig. 3, the first sealing member 57 comprises a bottom sealing member 5 disposed at the bottom of the cavity 9 and a top sealing member 7 disposed at the top of the cavity 9, respectively, to further ensure the sealing effect.

As a preferred technical solution, the device further comprises a second sealing member 8 arranged at the contact position of the ball valve downstream extension section 6 and the volute flange 1.

This is favorable to preventing the pressure water from entering the water thrust compensation structure through the contact part of the ball valve downstream extension section 6 and the volute flange 1 to cause pressure interference, and simultaneously preventing the pressure water and impurities in the water from influencing the service life of the water thrust compensation structure.

As a preferred technical solution, the first sealing element 57 and the second sealing element 8 are both sealing rings with adjustable compression amount.

The sealing ring has good sealing effect and is convenient to install; the adjustable amount of compression facilitates reduced wear and increases the useful life of the first seal 57 and the second seal 8.

Example 3

As shown in fig. 1 to 5, the present embodiment provides a more detailed implementation.

The invention provides a water thrust compensation structure of a water turbine volute, which indirectly transmits the water thrust of the volute to a downstream extension section of a ball valve, and finally bears the water thrust of the volute by a pressure pipeline system (preferably a pressure pipeline system formed by steel pipes) on the upstream of the ball valve.

The ball valve downstream extension section 6 can freely slide in the force balance flange 4, so the ball valve downstream extension section 6 and the force balance flange 4 can not restrict the movement of the ball valve, and the ball valve base 101 can not bear the load in the water flow direction, namely the new structure can not increase the base load of the original design.

The opening (inlet hole 10) of the downstream extension 6 of the ball valve introduces pressurized water into the high pressure chamber (cavity 9) formed by the downstream extension 6 of the ball valve and the force balance flange 4, so that the force balance flange 4 is subjected to a leftward water pressure. The pressure-bearing projection area of the force balance flange 4 along the water flow direction is adjusted to ensure that the water pressure on the force balance flange 4 to the left is equal to the water pressure on the volute flange 1 to the right. The volute flange 1 and the force balance flange 4 are rigidly connected through the connecting bolt 2, so that two forces with equal magnitude and opposite directions acting on the volute are mutually counteracted, and the volute is not subjected to the acting force in the water flow direction any more. At the same time, the high-pressure chamber formed by the downstream extension 6 of the ball valve and the force balance flange 4 applies a rightward force to the downstream extension 6 of the ball valve, and the force is transmitted to the upstream pressure pipe system through the ball valve because the ball valve base 101 does not bear the load in the water flow direction.

From this, through water thrust compensation flange, under not changing pressure pipe-line system, hydraulic turbine spiral case and ball valve structural design, do not increase basic load and do not influence the principle of overhauing, transmit the water thrust that the spiral case bore completely for pressure pipe-line system.

The technical scheme is also suitable for centrifugal single-stage and multi-stage water pumps with metal volutes.

According to the invention, the hole is formed on the ball valve downstream extension section 6, and pressure water is introduced into a cavity formed by the ball valve downstream extension section 6 and the force balance flange 4 so as to balance the water thrust applied to the volute flange 1, so that the volute does not bear the thrust in the water flow direction any more.

The first sealing member 57 and the second sealing member 8 of the present invention are not limited to the sealing ring structure in which the pressing amount is manually adjusted, and a combined sealing structure having more excellent performance may be used, or a sealing structure in which the pressing amount is automatically adjusted may be provided.

The structure of the ball valve downstream extension section 6 is not limited to that shown in the attached drawings, a steel pipe and the force balance flange 4 part can be connected into a whole by welding, an annular groove can be machined on the steel pipe, the force balance flange 4 part can be separately machined, and the force balance flange 4 part and the steel pipe part are assembled together by installing a metal key on the annular groove.

The sealing between the ball valve downstream extension section 6 and the volute flange 1 is not limited to the sealing structure shown in the drawing, and a groove can be machined on the flow surface on the inner side of the ball valve downstream extension section 6, and the second sealing element 8 is inserted into the groove for sealing.

The invention has the following advantages:

the volute of the invention does not bear water thrust any more, so that a thrust ring is not required to be arranged on the volute, the stress condition of the volute is improved, and the manufacturing cost is saved.

The volute has no thrust to be transmitted to the concrete, so that the volute does not need to be poured in the concrete, and the civil engineering period and the civil engineering cost are greatly saved.

The invention has no concrete arrangement, and is more convenient for the maintenance of the volute and the accessory equipment thereof and the intelligent monitoring of the running state of the volute.

By adopting the structure, the invention can greatly reduce the stress amplitude of the upstream pressure pipeline system and improve the fatigue life and reliability of the upstream pressure pipeline system.

The invention increases the length of the connecting bolt 2, the stress amplitude of the connecting bolt 2 is lower, and the fatigue resistance of the connecting bolt 2 is better.

As described above, the present invention can be preferably realized.

All features disclosed in all embodiments in this specification, or all methods or process steps implicitly disclosed, may be combined and/or expanded, or substituted, in any way, except for mutually exclusive features and/or steps.

The foregoing is only a preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and any simple modification, equivalent replacement and improvement made to the above embodiment within the spirit and principle of the present invention still fall within the protection scope of the present invention.