阅读说明：本技术 一种平面密封自力式流量控制阀 (Plane sealing self-operated flow control valve ) 是由 刘克勤 于 2020-06-01 设计创作，主要内容包括：本发明公开了一种平面密封自力式流量控制阀,包括阀体(1),所述阀体(1)的进口处具有压力腔体P1、出口处具有压力腔体P3,所述阀体(1)内下部具有压力腔体P2a和压力腔体P2b,所述压力腔体P2a与压力腔体P1之间通过通口Ⅰ(12)连通,所述压力腔体P2b与压力腔体P1之间通过通口Ⅱ(13)连通,所述通口Ⅰ(12)和通口Ⅱ(13)位于同一轴线上,所述压力腔体P2a和压力腔体P2b之间通过通口Ⅲ(14)连通；所述压力腔体P2a与压力腔体P3之间通过扇形孔Ⅰ(16)连通。本发明设计合理,实现流量的稳定控制,具有很好的实际应用及推广价值。(The invention discloses a plane sealing self-operated flow control valve, which comprises a valve body (1), wherein a pressure cavity P1 is arranged at the inlet of the valve body (1), a pressure cavity P3 is arranged at the outlet of the valve body, a pressure cavity P2a and a pressure cavity P2b are arranged at the inner lower part of the valve body (1), the pressure cavity P2a is communicated with the pressure cavity P1 through a port I (12), the pressure cavity P2b is communicated with the pressure cavity P1 through a port II (13), the port I (12) and the port II (13) are positioned on the same axis, and the pressure cavity P2a is communicated with the pressure cavity P2b through a port III (14); the pressure cavity P2a is communicated with the pressure cavity P3 through a fan-shaped hole I (16). The invention has reasonable design, realizes the stable control of the flow and has good practical application and popularization value.)

1. A plane sealing self-operated flow control valve is characterized in that: the pressure-sensitive valve comprises a valve body (1), wherein a pressure cavity P1 is arranged at an inlet of the valve body (1), a pressure cavity P3 is arranged at an outlet of the valve body, a pressure cavity P2a and a pressure cavity P2b are arranged at the lower part in the valve body (1), the pressure cavity P2a is communicated with the pressure cavity P1 through a port I (12), the pressure cavity P2b is communicated with the pressure cavity P1 through a port II (13), the port I (12) and the port II (13) are located on the same axis, and the pressure cavity P2a is communicated with the pressure cavity P2b through a port III (14); the pressure cavity P2a is communicated with the pressure cavity P3 through a fan-shaped hole I (16); the upper portion in the valve body (1) is provided with an execution cavity P4, a cavity opening of the execution cavity P4 is used as a top surface valve opening of the valve body (1), the top surface valve opening is provided with a valve cover (2), the center of the valve cover (2) is provided with a valve shaft (4), the lower end of the valve shaft (4) is inserted into a square hole (19) in the center of a membrane cover (8), the membrane cover (8) is fixed on the upper portion of a hollow T-shaped rotating shaft (9), a spring (5) is arranged in the valve shaft (4), the lower end of the spring (5) is abutted against a membrane (6), and the membrane (6) is positioned in the membrane cover (8) and is arranged on the upper portion of the T-shaped rotating; the center of the diaphragm (6) is arranged at the upper end of the valve rod (3), the valve rod (3) sequentially penetrates through a T-shaped rotating shaft (9), a reserved valve rod through hole (15) of a pressure cavity P2a, a through opening I (12) and a through opening II (13), a valve plug I (10) is arranged below the through opening I (12) on the valve rod (3), and a valve plug II (11) is arranged below the through opening II (13); t type pivot (9) bottom fixed mounting translation piece (7), be equipped with on translation piece (7) with sector hole II (17) that sector hole I (16) correspond, the plane at sector hole I (16) place constitutes the plane friction pair in translation piece (7) and valve body (1).

2. The flat seal self-operated flow control valve according to claim 1, wherein: and a temperature measuring plug (18) inserted into the pressure cavity P3 is arranged on the valve body (1).

3. A flat seal self-operated flow control valve according to claim 1 or 2, wherein: and a locking cover (20) is arranged outside the valve cover (2).

4. The flat seal self-operated flow control valve according to claim 1, wherein: an overflowing sheet is fixed on a plane where the sector hole I (16) in the valve body (1) is located, sector holes with the same or different sections as or different from the sector holes II (17) are formed in the overflowing sheet, and the translation sheet (7) and the overflowing sheet form a plane friction pair.

5. The flat seal self-operated flow control valve according to claim 1, wherein: the surface of the valve cover (2) is provided with a flow indicating dial, and the upper end of the valve shaft (4) is provided with a response pointer for indicating flow.

Technical Field

The invention relates to the technical field of control valves, in particular to a plane sealing self-operated flow control valve applied to heating equipment.

Background

At present, a plurality of self-operated flow control valves exist in the market, and the self-operated flow control valves need to meet corresponding national standards (GB/T29735-. The valve is a control valve which does not need to be driven by external power of a system and can keep stable flow within a working pressure difference range by means of self mechanical action. Meanwhile, the flow scale displayed on the valve can be used for accurately knowing the flow passing through the control valve. Because the two performance characteristics are widely applied to the hydraulic balance adjustment of the air conditioning circulating system and the heating circulating system, the adjustment becomes simple and convenient.

The self-operated flow control valve has two functions of flow setting and adjusting and flow keeping constant. And the two functions are realized by two-part construction in the valve. In the aspect of flow setting and adjusting, valves with two structures are mainly on the market at present, one is a rotating sleeve type switch adjusting structure, the structure changes the flow by changing the flow area of a main valve body in the radial direction through a rotating sleeve, and the rotating sleeve and the valve body have a certain gap so as to be convenient for manual operation or driving by using an electric actuator, and the leakage amount is inevitably increased due to the existence of the gap, so that the rotating sleeve is difficult to be completely closed. Another structure is a cone-cock type structure which can realize the shutoff but because the structure is pressed by a screw rod, the opening degree can be determined only by the rotation number when the flow rate is controlled, and the flow rate display is not clear. When the flow is set, the second part drives the floating valve plug to throttle and regulate pressure under the action of the regulating spring and the diaphragm through pressure feedback, so that the flow is kept constant. The traditional self-operated flow control valve focuses on the performance of ensuring constant medium flow, but cannot ensure that the medium flow is completely cut off in a cut-off state, so that the cut-off function cannot be realized, and the leakage flow is still large under many conditions. This necessitates the addition of a shut-off valve in the engineering, which increases the cost and installation space.

Disclosure of Invention

The invention aims to provide a plane sealing self-operated flow control valve with a novel structure, which realizes stable control of flow.

The invention is realized by adopting the following technical scheme:

a plane sealing self-operated flow control valve comprises a valve body, wherein a pressure cavity P1 is arranged at an inlet of the valve body, a pressure cavity P3 is arranged at an outlet of the valve body, a pressure cavity P2a and a pressure cavity P2b are arranged at the lower part in the valve body, the pressure cavity P2a is communicated with the pressure cavity P1 through a port I, the pressure cavity P2b is communicated with the pressure cavity P1 through a port II, the port I and the port II are located on the same axis, and the pressure cavity P2a is communicated with the pressure cavity P2b through a port III; the pressure cavity P2a is communicated with the pressure cavity P3 through a fan-shaped hole I; an execution cavity P4 is arranged at the upper part in the valve body, a cavity opening of the execution cavity P4 is used as a top surface valve opening of the valve body, a valve cover is arranged on the top surface valve opening, a valve shaft is arranged in the center of the valve cover, the lower end of the valve shaft is inserted into a square hole in the center of the film cover, the film cover is fixed at the upper part of a hollow T-shaped rotating shaft, a spring is arranged in the valve shaft, the lower end of the spring is abutted against a diaphragm, and the diaphragm is positioned in the film cover and is arranged at the upper part; the center of the diaphragm is arranged at the upper end of the valve rod, the valve rod sequentially penetrates through the T-shaped rotating shaft, a reserved valve rod through hole of the pressure cavity P2a, an opening I and an opening II, a valve plug I is arranged below the opening I on the valve rod, and a valve plug II is arranged below the opening II on the valve rod; the bottom of the T-shaped rotating shaft is fixedly provided with a translation sheet, the translation sheet is provided with a fan-shaped hole II corresponding to the fan-shaped hole I, and the translation sheet and a plane where the fan-shaped hole I is located in the valve body form a plane friction pair.

Preferably, an overflowing sheet is fixed on a plane where the sector hole I is located in the valve body, the overflowing sheet is provided with a sector hole identical to the sector hole II, and the translation sheet and the overflowing sheet form a plane friction pair.

During operation, water flows into the pressure cavity P1, enters the pressure cavity P2a and the pressure cavity P2b through the port I and the port II of the double-valve hole respectively, then the water flow entering the pressure cavity P2b is converged with the water flow in the pressure cavity P2a through the port III 14, and then flows into the pressure cavity P3 through the fan-shaped hole I and the fan-shaped hole II of the translation piece until the water flow flows out. (1) When the inlet pressure increases, i.e. the pressureP ₁ Increase (resulting in pressure entering pressure chamber P2a and pressure chamber P2bP ₂ Increase), water pressure promotes the diaphragm upward movement along the valve rod external diameter periphery, drives the valve plug I and the II upward movements of valve plug of valve rod simultaneously, carries out simultaneously opening I and opening II to the bivalve holeThrottling, to enable pressureP ₂ Decreasing to the design value, the pressure is maintainedP ₂ –P ₃ The flow is basically unchanged, and the flow is ensured to be basically unchanged. (2) When the inlet pressure is reduced, i.e. pressureP ₁ Decrease (resulting in pressure entering pressure chamber P2a and pressure chamber P2bP ₂ Reduce), because the spring action of diaphragm epicoele makes diaphragm drive valve plug I and the II descents of valve plug of valve rod, make the increase of opening I and II opening capacities of opening of two valve openings for pressureP ₂ Increasing to the design value, the pressure is maintainedP ₂ –P ₃ The flow is basically unchanged, and the flow is ensured to be basically unchanged. (3) When the outlet pressure is higherP ₃ When the pressure increases, the actuating chamber P4 and the pressure chamber P3 are at the same pressureP ₃ The valve plug I and the valve plug II of the valve rod are driven by the pressure pushing diaphragm to descend, so that the opening I and the opening II of the opening of the double-valve hole are increased, and the pressure is enabled to be appliedP ₂ And correspondingly increased, the pressure is maintainedP ₂ –P ₃ The flow is basically unchanged, and the flow is ensured to be basically unchanged. (4) When the outlet pressure is higherP ₃ When the pressure is reduced, the actuating cavity P4 and the pressure cavity P3 are at the same pressureP ₃ The water flow pressure pushes the diaphragm to move upwards along the periphery of the outer diameter of the valve rod, the valve plug I and the valve plug II which drive the valve rod simultaneously move upwards, and throttling is simultaneously performed on the port I and the port II of the double valve holes, so that the pressureP ₂ Is also reduced accordingly, the pressure is maintainedP ₂ –P ₃ The flow is basically unchanged, and the flow is ensured to be basically unchanged.

The invention has reasonable design and good practical application and popularization value.

Drawings

Fig. 1 shows a schematic structural view of the present invention.

In the figure: 1-valve body, 2-valve cover, 3-valve rod, 4-valve shaft, 5-spring, 6- (elastic) diaphragm, 7-translational sheet, 8-membrane cover, 9-T type rotating shaft, 10-valve plug I, 11-valve plug II, 12-port I, 13-port II, 14-port III, 15-valve rod through hole, 16-fan-shaped hole I, 17-fan-shaped hole II, 18-temperature measuring plug, 19-square hole and 20-locking cover.

Detailed Description

The following detailed description of specific embodiments of the invention refers to the accompanying drawings.

A plane sealing self-operated flow control valve is shown in figure 1 and comprises a valve body 1, wherein a pressure cavity P1 is arranged at the inlet of the valve body 1 (a cavity opening of a pressure cavity P1 is used as a control valve inlet and is provided with connecting internal threads), and a pressure cavity P3 is arranged at the outlet of the valve body 1 (a cavity opening of a pressure cavity P3 is used as a control valve outlet and is provided with connecting internal threads). An actuating cavity P4 is arranged at the upper part in the valve body 1, a pressure cavity P2a and a pressure cavity P2b are arranged at the lower part in the valve body 1, the pressure cavity P2a is communicated with the pressure cavity P1 through a port I12, the pressure cavity P2b is communicated with the pressure cavity P1 through a port II 13, the port I12 and the port II 13 are positioned on the same axis, and the pressure cavity P2a is communicated with the pressure cavity P2b through a port III 14; pressure chamber P2a and pressure chamber P3 are in communication through a scallop I16.

As shown in fig. 1, an execution cavity P4 is provided at an upper portion of the valve body 1 (the execution cavity P4 is in a communicating state with the pressure cavity P3), a cavity opening of the execution cavity P4 is used as a top surface valve opening of the valve body 1, the top surface valve opening is provided with the valve cover 2 through a bolt, the valve cover 2 is provided with the valve shaft 4 at the center (the valve cover 2 is provided with the valve shaft 4 through a shaft shoulder of the valve shaft 4), the lower end of the valve shaft 4 is inserted into a square hole 19 at the center of the film cover 8 in a matching manner to drive the film cover 8 to rotate, the film cover 8 is fixed at the upper portion of the hollow T-shaped rotating shaft 9 through a rivet or the like (the T-shaped rotating shaft 9 is coaxially located above a reserved valve shaft through hole 15 of the pressure cavity P2 a), the valve shaft 4 is provided with a spring 5, the lower end of the spring 5 abuts.

As shown in fig. 1, 6 central authorities of diaphragm are installed in valve rod 3 upper end, valve rod 3 passes T type pivot 9 in proper order, pressure chamber P2a reserves valve rod via hole 15, through opening I12, through opening II 13 (valve rod 3 and T type pivot 9, leave sufficient clearance between the valve rod via hole 15), it is equipped with conical valve plug I10 to lie in through opening I12 below on the valve rod 3, lie in through opening II 13 below and be equipped with conical valve plug II 11, the maximum diameter of valve plug I10 and valve plug II 11 is basically equal to through opening I12, the orifice diameter of through opening II 13, valve plug I10 is used for adjusting the flow that gets into pressure chamber P2a, valve plug II 11 is used for adjusting the flow that gets into pressure chamber P2 b.

As shown in figure 1, a translation sheet 7 is fixedly installed at the bottom of a T-shaped rotating shaft 9, a sector hole II 17 corresponding to a sector hole I16 is formed in the translation sheet 7, and a plane friction pair is formed by the translation sheet 7 and a plane where the sector hole I16 is located in a valve body 1. The valve shaft 4, the membrane cover 8, the T-shaped rotating shaft 9 and the translation sheet 7 rotate synchronously, and the fan-shaped holes II 17 and the fan-shaped holes I16 are staggered and used for regulating the flow rate of water flow entering the pressure cavity P3 from the pressure cavity P2 a.

Preferably, an overflowing sheet (not shown in fig. 1) is fixed on a plane where the fan-shaped hole i 16 is located in the valve body 1, a fan-shaped hole with the same or different section as that of the fan-shaped hole ii 17 is formed in the overflowing sheet, and then the translation sheet 7 and the overflowing sheet form a plane friction pair.

The flow of the control valve has a linear relation with the opening of the fan-shaped hole I16, the opening area of the fan-shaped hole I16 is covered by the control fan-shaped hole II 17, and then the flow of the control valve is adjusted, so that the surface of the valve cover 2 is provided with a flow indicating dial, and the upper end of the valve shaft 4 is provided with a response pointer for indicating the flow, so that the flow of the control valve is visually represented.

As shown in fig. 1, a temperature measuring plug 18 inserted into the pressure chamber P3 is provided on the valve body 1, the self-operated flow control valve with a temperature measuring blind pipe can measure the temperature of the water flow at the outlet of the control valve, and if a through hole is designed between the pressure chamber P2b and the pipe wall of the temperature measuring blind pipe, the temperature of the water flow in the pressure chamber P2a and the pressure chamber P2b can also be measured.

As shown in fig. 1, the valve cap 2 is externally provided with a locking cover 20 which can be opened only by a special key to prevent an irrelevant person from adjusting freely.