CN110822143B - Constant flow combined valve - Google Patents
Constant flow combined valve Download PDFInfo
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- CN110822143B CN110822143B CN201910568181.0A CN201910568181A CN110822143B CN 110822143 B CN110822143 B CN 110822143B CN 201910568181 A CN201910568181 A CN 201910568181A CN 110822143 B CN110822143 B CN 110822143B
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention discloses a constant flow combined valve, which comprises a first connecting pipeline, a constant-difference pressure reducing valve, a regulating valve and a second connecting pipeline, wherein the first connecting pipeline, the constant-difference pressure reducing valve, the regulating valve and the second connecting pipeline are connected into a whole by a fastener in series, the central lines of the first connecting pipeline and the second connecting pipeline are on the same axis, the constant-difference pressure reducing valve is arranged in front of the regulating valve, circular tube-shaped slide valves are arranged in the inner cavities of a left valve body and a right valve body of the constant-difference pressure reducing valve, a regulating seat and a regulating plate are arranged at the left end of the left valve body, a valve sleeve is arranged in the middle part of the valve sleeve, an inner hole of the valve sleeve is in sliding fit with the peripheral surface of the slide valve, and the regulating plate and the annular end surface at the left end of the slide valve form a valve port; a diaphragm is arranged between the outer convex ring at the right end of the slide valve and the connecting parts of the left valve body and the right valve body, springs and pressure regulating screws are respectively arranged at two sides of the diaphragm, a front diaphragm cavity is arranged at the left side of the diaphragm, the diaphragm is connected with a water outlet cavity through a connecting pipe, a rear diaphragm cavity is arranged at the right side of the diaphragm, and the diaphragm is communicated with an inner hole of the slide valve. When the invention works, if the pressure at the inlet or the outlet of the regulating valve fluctuates, the pressure difference at the two ends of the regulating valve can be automatically stabilized, so that the flow passing through the regulating valve is kept unchanged.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a constant flow combination valve capable of automatically stabilizing pressure difference at two ends of a regulating valve.
Background
In a piping system for transporting liquid medium such as water or oil, a regulating valve such as a ball valve or a butterfly valve is generally used for regulating the flow rate, but there is a disadvantage that when the pressure of an inlet or an outlet fluctuates, a pressure difference across the regulating valve changes, so that the flow rate passing through the regulating valve changes, which is undesirable in some cases, for example, in an air conditioning system, when the amount of hot water or coolant passing through the regulating valve changes, a temperature of a controlled environment changes, causing discomfort or wasting energy.
Disclosure of Invention
The invention aims to solve the problem that the system state is changed due to the fact that the flow rate of a regulating valve is easy to change when the pressure of an inlet or an outlet of the regulating valve fluctuates in a pipeline system for conveying liquid in the prior art, and provides a constant flow rate combined valve which can automatically stabilize the pressure difference at two ends of the regulating valve, so that the flow rate in the pipeline system is basically unchanged.
The invention adopts a specific technical scheme for solving the technical problems that the constant flow combined valve comprises a first connecting pipeline, a constant difference pressure reducing valve, a regulating valve, a second connecting pipeline and flanges arranged at two ends of the first connecting pipeline and the second connecting pipeline, wherein the flanges are connected in series by fasteners to form a whole, the center lines are on the same axis, and the connecting sequence of the constant flow combined valve from left to right is as follows: the first connecting pipeline, the fixed difference pressure reducing valve, the regulating valve and the second connecting pipeline are arranged in front of the regulating valve; the constant-difference pressure reducing valve comprises a left valve body, a right valve body, a valve sleeve, a slide valve, a spring, a diaphragm, a pressing plate, a compression nut, a pressure regulating screw rod, a regulating seat, a regulating plate and the like; the valve body of the constant-difference pressure reducing valve is formed by connecting a left valve body and a right valve body through fasteners, the two ends of the left valve body are flanges, the middle section of the left valve body is a cylinder, three stepped holes and a taper hole are not formed in an inner hole, and a connecting hole I is formed on the right side of the cylinder wall; the two ends of the right valve body are flanges, the middle barrel body is composed of two parts, the right side is a cylinder, the left side is a cone barrel, a lug is arranged on the cone barrel, a stepped hole is arranged on the lug, threads are arranged on the small hole of the stepped hole, the axis of the stepped hole is parallel to the axis of the right valve body, and a pressure regulating screw rod is arranged in the stepped hole.
Preferably, the valve sleeve is a circular ring assembly with a circular hole in the center, a large middle outer diameter and small outer diameters at two ends, the largest outer circle of the valve sleeve is in sliding fit with a third stepped hole of the left valve body and leans against a corresponding shoulder blade, the second elastic retainer ring for the hole is used for positioning, the second O-shaped sealing ring is arranged on the largest outer circle, a groove for accommodating a spring is arranged on the right end face of the large circular ring, and the third O-shaped sealing ring is arranged at the left end of the inner hole of the valve sleeve.
Preferably, the slide valve is a cylinder, the outer circle of the cylinder is in sliding fit with the inner hole of the sliding sleeve, the slide valve can freely move in the inner hole, the left end of the outer circle of the cylinder is provided with an elastic retainer ring for a shaft so as to limit the rightward moving distance of the slide valve, the right end of the outer circle of the cylinder is provided with an outer convex ring, the outer circle of the right end of the outer convex ring is provided with threads, and the threads are sleeved with the pressing plate and screwed with a compression nut.
Preferably, the spring is disposed between the recess in the right end face of the valve sleeve and the male collar of the spool valve.
Preferably, the inner ring of the diaphragm is pressed between the outer convex ring of the slide valve and the pressing plate by the pressing nut, and the thickened ring at the edge of the outer ring of the diaphragm is pressed in the flange surface at the right end of the left valve body and the groove at the left flange end surface of the right valve body by the fastening piece. The thickened ring plays a double role of sealing and positioning.
Preferably, the adjusting seat is in a wheel-shaped structure, the outer ring of the adjusting seat is in sliding fit with the first stepped hole of the left valve body and leans against the corresponding shoulder blade, the first elastic retainer ring for holes is used for positioning, the outer ring is connected with the circular plate-shaped hub through a plurality of spokes, and a screw hole is formed in the center of the hub.
Preferably, the adjusting plate consists of a circular plate and a screw rod, the screw rod is screwed with a screw hole in the center of the hub of the adjusting seat, the circular plate of the adjusting plate and the annular end face at the left end of the slide valve form a valve port, the opening of the valve port can be adjusted by rotating the adjusting plate, and after the opening meets the requirement, the valve port is locked by a locking nut.
Preferably, the pressure regulating device for regulating the pressure difference at two ends of the regulating valve comprises a pressure regulating screw, a pressure plate, a spring and a fixing nut, wherein an outer cylinder at the middle section of the pressure regulating screw is slidably matched with a large hole of a stepped hole on the convex block, an O-shaped sealing ring I is arranged, the end face of a small shaft at the left end of the pressure regulating screw is vertically propped against the right end face of the pressure plate, a thread is arranged on the small shaft at the right end and is screwed with the thread in the small hole of the stepped hole, a square opening for rotating the pressure regulating screw is arranged at the right end of the thread, and the pressure regulating screw can be rotated, so that the pressure plate can be moved left and right to compress or relax the spring, and the pre-pressure of the spring is set. Preferably, the cylinder wall of the left valve body, the right side of the valve sleeve, the left side of the diaphragm and the annular cavity surrounded by the periphery of the slide valve are membrane front cavities, and as the first connecting hole on the cylinder wall of the left valve body is connected with the second connecting hole on the second connecting pipeline through the joint and the connecting pipe, the membrane front cavities are communicated with the water outlet cavity, and the pressure of the membrane front cavities is equal to the water outlet pressure; the cavity from the valve port to the front of the regulating valve is a middle cavity, which comprises the valve port, an inner hole of the slide valve, a film rear cavity and a small inner hole of the right valve body, and the pressure in the middle cavity is equal to the inlet pressure of the regulating valve.
Preferably, a front valve pressure detection hole of the regulating valve is formed in the wall of the right valve body, and a rear valve pressure detection hole of the regulating valve is formed in the wall of the second connecting pipeline. The front pressure detection hole and the rear pressure detection hole are respectively connected with a pressure gauge or a pressure difference gauge through ball valves and the like and are used for adjusting or measuring the pressure difference at two ends of the adjusting valve.
The beneficial effects of the invention are as follows: the constant flow combined valve can automatically stabilize the pressure difference at two ends of the regulating valve, so that the flow in the pipeline system is basically unchanged.
Drawings
FIG. 1 is a schematic diagram of a constant flow combining valve of the present invention.
In the figure: 1. the connecting pipe I, the locking nut I, the adjusting seat I, the hole I, the adjusting plate I, the left valve body 6, the valve sleeve 7, the valve sleeve 8, the spring 9, the slide valve 10, the diaphragm 11, the pressing plate 12, the pressing nut, the right valve body, the first 14O-shaped sealing ring, the fixed nut, the 16 pressure regulating screw, the 17 pressure regulating valve, the 18 connecting pipe, the second 19 connecting pipe, the 20 connector, the 21O-shaped sealing ring, the 22 hole and the second elastic retainer ring, O-shaped sealing ring III, 24, elastic retainer ring for shaft, 25, fastening bolt, 26, gasket, 27, fastening nut, a, connecting hole I, b, connecting hole II, c, valve front pressure detecting hole, d, valve rear pressure detecting hole, G, bump, H1, water inlet cavity, H2, middle cavity, H3. water outlet cavity, H4. membrane front cavity, H5. space between regulating seat spokes, P1, water inlet cavity pressure, P2, middle cavity pressure, P3, water outlet cavity pressure, V, valve port, delta, valve port opening.
Detailed Description
The following is a further description of embodiments of the invention, by way of example, with reference to the accompanying drawings.
In the embodiment shown in fig. 1, a constant flow combined valve comprises a first connecting pipeline 1, a constant difference reducing valve, a regulating valve 17, a second connecting pipeline 18 and flanges arranged at two ends of the first connecting pipeline, wherein the flanges are connected in series to form a whole through a fastening bolt 25, a gasket 26 and a fastening nut 27, and the central lines of the four parts are on the same axis; the connection sequence from left to right is: the first connecting pipeline 1, the constant-difference pressure reducing valve, the regulating valve 17 and the second connecting pipeline 18 are arranged in front of the regulating valve 17.
The regulating valve 17 is a common regulating valve such as a ball valve, a butterfly valve and the like, the middle section of the first connecting pipeline 1 is a cylinder, and the left flange is connected with a corresponding flange of the upstream water inlet pipeline; the middle section of the second connecting pipeline 18 is a cylinder, a second connecting hole b and a pressure detection hole d behind the valve are arranged in the middle of the pipe wall, and the right flange is connected with a flange corresponding to the downstream water outlet pipeline.
The constant-difference pressure reducing valve consists of a left valve body 6, a right valve body 13, an adjusting seat 3, an adjusting plate 5, a locking nut 2, a valve sleeve 7, a spring 8, a slide valve 9, a diaphragm 10, a pressing plate 11, a compression nut 12, a fixing nut 15, a pressure regulating screw 16 and other parts, wherein two ends of the left valve body 6 are flanges, a middle section is a cylinder, three stepped holes are formed in an inner hole of the cylinder, a taper hole is formed in the right end, and a connecting hole A is formed in a wall of the right side cylinder. The valve sleeve 7 is a circular ring assembly with a circular hole in the center, a large middle outer diameter and small outer diameters at two ends, the largest outer circle of the valve sleeve is in sliding fit with a third stepped hole of the left valve body 6 and leans against a corresponding shoulder blade, the second elastic retainer ring 22 for the hole is used for positioning, a groove for accommodating the spring 8 is formed in the right end face of the valve sleeve, and grooves for installing the second O-shaped sealing ring 21 and the third O-shaped sealing ring 23 are formed in the outer cylindrical surface and the inner hole.
The slide valve 9 is a cylinder, the right end is provided with an outer convex ring, the surface of the outer cylinder on the right side of the outer convex ring is provided with threads, the outer circle on the left end of the cylinder is provided with a groove for installing the elastic retainer 24 for the shaft so as to limit the rightward moving distance of the slide valve 9, and the outer circle of the slide valve 9 is slidably matched in the inner hole of the slide sleeve 7 and can freely move left and right. The spring 8 is arranged between the recess of the right end face of the valve sleeve 7 and the male collar of the slide valve 9. The inner ring of the diaphragm 10 is pressed between the outer convex ring of the slide valve 9 and the pressing plate 11 by the pressing nut 12, the pressing nut 12 is a flat round nut, the thickened ring at the edge of the outer ring of the diaphragm 10 is pressed in the flange surface at the right end of the left valve body 6 and the groove at the left flange end surface of the right valve body 13 by fastening pieces such as bolts, nuts and the like, and the thickened ring plays a double role of sealing and positioning.
The shape of the adjusting seat 3 is a flat cylinder, the structure is like an ancient carriage wheel shape, the ring at the outer edge and the circular plate-shaped hub are connected into a whole by a plurality of spokes, a screw hole is arranged at the center of the hub, the outer ring is in sliding fit with the first stepped hole of the left valve body 6 and is leaning against the corresponding shoulder blade, and the outer ring is positioned by the elastic retainer ring I4 for holes; the adjusting plate 5 consists of a flat circular plate and a screw rod which is positioned in the center of the adjusting plate and is vertical to the adjusting plate, the screw rod is screwed with a screw hole in the center of a hub of the adjusting seat 3, the circular plate and the annular end face at the left end of the slide valve 9 form a valve port V of the constant-difference pressure reducing valve, the opening delta of the valve port V can be adjusted by rotating the adjusting plate 5, and the valve port V is locked by the locking nut 2 after the opening delta meets the requirement. The opening delta is already adjusted when the product leaves the factory, and when the product is used for a long time, the pressure regulating device can be reset after the elasticity of the spring 8 is reduced.
The two ends of the right valve body 13 are flanges, the diameter of the left end flange is larger than that of the right end, the left flange is connected with the right flange of the left valve body 6, the barrel of the middle section is composed of two parts, the right side is a cylinder, the left side is a cone, a bump G is arranged on the cone, a stepped hole is arranged on the bump G, threads are arranged on the small hole of the stepped hole, the axis of the stepped hole is parallel to the axis of the right valve body 13, and a pressure regulating screw 16 is arranged in the stepped hole. The outer cylinder of the middle section of the pressure regulating screw 16 is in sliding fit with the large hole of the stepped hole on the convex block G, an O-shaped sealing ring I14 is arranged, the end face of the small shaft at the left end of the pressure regulating screw is vertically propped against the right end face of the pressing plate 11, the small shaft at the right end is provided with threads and is screwed with the threads in the small hole of the stepped hole, and the right end of the threads is provided with a square opening for rotating the pressure regulating screw 16; the pressure regulating screw 16, the pressing plate 11, the spring 8, the fixing nut 15 and the like.
The first connecting hole a on the wall of the left valve body 6 is communicated with the second connecting hole b on the wall of the second connecting pipeline 18 through a joint 20 and a connecting pipe 19; the front valve pressure detection hole c on the right cylinder wall of the right valve body 13 and the rear valve pressure detection hole d on the cylinder wall of the second connecting pipeline 18 are respectively connected with a pressure gauge or a differential pressure gauge through ball valves and the like to measure the differential pressure at two ends of the regulating valve 17; three O-shaped sealing rings are used for preventing leakage or internal leakage of the medium.
A plurality of cavities are formed in the combined valve, a cavity between an inner hole of the first connecting pipeline 1 and the valve port V is a water inlet cavity H1, and the pressure of the water inlet cavity is water inlet pressure P1; the cavity between the valve port V and the regulating valve 17 is an intermediate cavity H2, and the pressure of the intermediate cavity, namely the pressure in front of the regulating valve, is P2, so that the pressure in front of the valve port V, the inner hole of the slide valve 9, the right side cavity of the diaphragm 10 and the regulating valve is P2; the cavity behind the governing valve is water outlet cavity H3, and the pressure of water outlet cavity is water outlet pressure P3. The annular cavity surrounded by the right side of the sliding sleeve 7, the left side of the diaphragm 10, the inner wall of the left valve body 6 and the periphery of the sliding valve 9 is a membrane front cavity H4, and the pressure of the membrane front cavity is equal to the water outlet pressure P3 because the water outlet cavity H3 is communicated with the membrane front cavity H4 through a connecting pipe 19.
The working principle of the invention is as follows: before water is supplied, the slide valve 9 is at the rightmost position under the action of the spring 8, namely, the right side surface of the pressing plate 11 is vertically abutted against the end surface of the small shaft at the left end of the pressure regulating screw 16, and at the moment, the valve port V is fully opened, and the opening delta is maximum.
After water is introduced, the pressurized water in the first connecting pipeline 1 enters the middle cavity H2 through the space H5 among the spokes of the regulating seat 3 and the valve port V, the pressure P2 in the middle cavity H2 rises and acts on the right side of the diaphragm to push the slide valve 9 to move leftwards, the opening delta of the valve port V is reduced, the throttling and depressurization effects of the valve port are increased, and the pressure P2 in the middle cavity H2 is reduced and is lower than the water inlet pressure P1. Meanwhile, the outlet pressure P3 of the outlet chamber H3 after the pressure regulating valve 17 enters the membrane front chamber H4 through the connection pipe 19 and acts on the left side of the diaphragm 10, and when the pressures acting on the left and right sides of the diaphragm 10 and the set force of the spring 8 are balanced, the spool 9 is in an ideal design position, and the differential pressure across the regulating valve 17 is Δp=f/S (see later).
When the water inlet pressure P1 rises, the pressure P2 of the middle cavity H2 rises along with the rising moment when the slide valve 9 does not act, the thrust acting on the right side of the diaphragm 10 increases, the stress balance of the slide valve 9 is destroyed, the slide valve 9 moves leftwards, the opening delta of the valve port V decreases, the throttling and depressurization effect increases, the pressure P2 of the middle cavity H2 decreases along with the rising moment until the original value is recovered, and the delta P=P2-P3 is kept unchanged; conversely, when the intake pressure P1 decreases, the pressure P2 in the intermediate chamber H2 decreases, the spool 9 moves rightward under the urging force of the spring 8, the opening Δ of the valve port V increases, the throttle reducing function of the valve port decreases, the pressure P2 in the intermediate chamber H2 increases until the original value is recovered, and Δp=p2-P3 remains unchanged.
When the water outlet pressure P3 of the water outlet cavity H3 is increased, the pressure in the membrane front cavity H4 is synchronously increased through the connecting hole B, the connecting pipe 19 and the connecting hole A, the membrane 10 is pushed to move rightwards, the opening delta of the valve port V is increased, the throttling and depressurization effects are weakened, the pressure P2 in the middle cavity H2 is increased, and delta P=P2-P3 is kept unchanged; conversely, when the outlet pressure P3 of the outlet chamber H3 decreases, the spool 9 moves leftward, the opening Δ of the valve port V decreases, the throttle reducing function increases, and the pressure P2 of the intermediate chamber H2 decreases, so that Δp=p2—p3 remains unchanged.
From the above analysis, during normal water supply, the pressurized water in the water inlet cavity is supplied to the downstream through the space H5 between the spokes of the adjusting seat 3, the valve port V, the middle cavity H2, the adjusting valve 17 and the water outlet cavity H3. When the pressure of the water inlet cavity or the water outlet cavity fluctuates, the pressure of the inlet end of the regulating valve 17 is compensated by the constant-difference reducing valve, so that the pressure difference of the two ends of the regulating valve 17 can be kept unchanged, and the passing flow is kept unchanged.
The pressure difference value of the two ends of the regulating valve 17 can be set by regulating the pre-pressure of the spring 8 of the pressure regulating device according to actual conditions, and the pressure regulating screw 16 is rotated, so that the pressure plate 11 can move left and right to compress or relax the spring 8, thereby changing the pre-pressure of the spring 8, and after the pre-pressure is set, the spring is locked by the fixing nut 15.
The differential pressure value of the two ends of the regulating valve after water is introduced is calculated.
When the slide valve is in the balance position, the force balance equation of the slide valve is:
P2*S±Fm=P3*S+k*（X 0 +x) is:
（P2-P3）*S=k*（X 0 +X）±Fm……（1）
wherein:
p2-valve front pressure of regulating valve (Pa)
P3-valve back pressure of regulating valve (Pa)
S-effective stress area of diaphragm (m, m)
Fm-Friction force (N) during slide valve movement
Stiffness of k-spring (N/m)
X 0 Setting the pre-compression (m) of the spring under pressure difference
The additional amount of change (m) of the spring when the pre-valve or post-valve pressure of the X-regulator valve changes can be positive or negative.
In order to simplify the calculation, the friction force Fm is negligible because of the small pre-compression force relative to the spring, and equation (1) can be simplified to
P2-P3=k*X 0 /S+ k*X/S……（2）
Due to the large diaphragm area S available in design, the small spring rate k and the large precompression X 0 And when the pressure of the regulating valve before or after the valve changes, the additional fluctuation amount X of the spring is smaller, so that k X/S term in the formula (2) can be ignored, and the formula (2) can be simplified as follows:
P2-P3=k*X 0 /S=F/S……（3）
here f=k×x 0 The pre-compression force (N) of the spring under the set pressure difference is obtained.
As can be seen from the expression (3), the differential pressure Δp=p2-p3=f/S across the regulator valve after water passage is a constant value because it is related only to the pre-pressure of the spring and the diaphragm area.
Claims (10)
1. The utility model provides a constant flow combination valve, includes connecting tube one, decides poor relief pressure valve, governing valve and connecting tube two, and the both ends of above-mentioned part all are equipped with the flange, establish ties into an organic wholely by the fastener, and the central line of four parts is on same axis, its characterized in that: the connection sequence of the constant flow combination valve from left to right is as follows: the device comprises a first connecting pipeline (1), a fixed difference pressure reducing valve, a regulating valve (17) and a second connecting pipeline (18), wherein the fixed difference pressure reducing valve is positioned in front of the regulating valve; the constant difference pressure reducing valve comprises a left valve body (6), a right valve body (13), a valve sleeve (7), a slide valve (9), a spring (8), a diaphragm (10), a pressing plate (11), a compression nut (12), an adjusting seat (3) and an adjusting plate (5); the valve body of the constant-difference pressure reducing valve is formed by connecting a left valve body (6) and a right valve body (13) through fasteners, flanges are arranged at two ends of the left valve body (6), a cylinder is arranged at the middle section, three stepped holes and a taper hole are arranged in an inner hole, and a connecting hole I (a) is arranged on the right side of the cylinder wall; flanges are arranged at two ends of the right valve body (13), the middle cylinder body consists of two parts, the right side is a cylinder, the left side is a cone cylinder, a convex block (G) is arranged on the cone cylinder, a stepped hole is arranged on the convex block (G), threads are arranged on a small hole of the stepped hole, the axis of the stepped hole is parallel to the axis of the right valve body (13), and a pressure regulating screw (16) is arranged in the stepped hole; the valve sleeve (7) is a circular ring assembly with a circular hole in the center, and the maximum excircle of the valve sleeve is in sliding fit with the third stepped hole of the left valve body (6); the slide valve (9) is a cylinder, and the outer circle of the slide valve (9) is in sliding fit with the inner hole of the slide sleeve (7); the inner ring of the diaphragm (10) is fixed between the outer convex ring of the slide valve (9) and the pressing plate (11), and the outer ring of the diaphragm (10) is fixed between the left valve body (6) and the right valve body (13); the first connecting hole (a) on the wall of the left valve body (6) is connected with the second connecting hole (b) on the second connecting pipeline (18) through a joint (20) and a connecting pipe (19).
2. The constant flow combining valve according to claim 1, wherein: the valve sleeve (7) is a circular ring assembly with a large middle outer diameter and small outer diameters at two ends, the largest outer circle of the valve sleeve is slidably matched with a third stepped hole of the left valve body (6) and leans against a corresponding shoulder blade, the second elastic retainer ring (22) for holes is used for positioning, the second O-shaped sealing ring (21) is arranged on the largest outer circle, a groove for accommodating the spring (8) is formed in the right end face of the large circular ring, and the third O-shaped sealing ring (23) is arranged on the left end face of the inner hole of the valve sleeve (7).
3. The constant flow combining valve according to claim 1, wherein: the outer circle of the slide valve (9) can freely move in the inner hole of the slide sleeve (7), the left end of the outer circle of the cylinder is provided with an elastic retainer ring (24) for a shaft so as to limit the rightward movement distance of the slide valve (9), the right end of the outer circle of the cylinder is provided with an outer convex ring, the outer circle of the right end of the outer convex ring is provided with threads, and the threads are sleeved with the pressing plate (11) and screwed with the compression nut (12).
4. A constant flow combining valve as claimed in claim 3, wherein: the spring (8) is arranged between the groove on the right end surface of the valve sleeve (7) and the outer convex ring of the slide valve (9).
5. The constant flow combining valve according to claim 1, wherein: the inner ring of the diaphragm (10) is pressed between the outer convex ring of the slide valve (9) and the pressing plate (11) by the pressing nut (12), and the thickened ring at the edge of the outer ring of the diaphragm (10) is pressed in the flange surface at the right end of the left valve body (6) and the groove at the left flange end surface of the right valve body (13) by the fastening piece.
6. The constant flow combining valve according to claim 1, wherein: the adjusting seat (3) is of a wheel-shaped structure, an outer ring of the adjusting seat (3) is in sliding fit with a first stepped hole of the left valve body (6) and leans against a corresponding shoulder blade, the first elastic retainer ring (4) for holes is used for positioning, the outer ring is connected with the circular plate-shaped hub through a plurality of spokes, and a screw hole is formed in the center of the hub.
7. The constant flow combining valve of claim 6, wherein: the adjusting plate (5) consists of a circular plate and a screw rod, the screw rod is positioned in the center of the circular plate and is vertical to the circular plate, the screw rod is screwed with a screw hole in the center of a hub of the adjusting seat (3), the circular plate of the adjusting plate (5) and the annular end face at the left end of the slide valve (9) form a valve port (V), the opening (delta) of the valve port (V) can be adjusted by rotating the adjusting plate (5), and after the opening (delta) meets the requirement, the valve port (V) is locked by the locking nut (2).
8. The constant flow combining valve according to claim 1, wherein: the pressure regulating device for regulating the pressure difference at two ends of the regulating valve (17) comprises a pressure regulating screw (16), a pressing plate (11), a spring (8) and a fixing nut (15); the outer cylinder of the middle section of the pressure regulating screw (16) is in sliding fit with the large hole of the stepped hole on the convex block (G), an O-shaped sealing ring I (14) is arranged, the end face of the small shaft at the left end of the pressure regulating screw is vertically propped against the right end face of the pressing plate (11), the small shaft at the right end is provided with threads and is screwed with the threads in the small hole of the stepped hole, the right end of the threads is provided with a square opening for rotating the pressure regulating screw (16), and the pressure regulating screw (16) is rotated, so that the pressing plate (11) can move left and right to compress or relax the spring (8), and the pre-pressure of the spring (8) is set; after the pre-pressure of the spring (8) is set, the pressure regulating screw (16) is locked by a fixing nut (15).
9. The constant flow combining valve according to claim 1, wherein: the wall of the left valve body (6), the right side of the valve sleeve (7), the left side of the diaphragm (10) and the annular cavity surrounded by the periphery of the slide valve (9) are the membrane front cavity (H4), and as the connecting hole I (a) on the wall of the left valve body (6) is connected with the connecting hole II (b) on the connecting pipeline II (18) through the connector (20) and the connecting pipe (19), the membrane front cavity (H4) is communicated with the water outlet cavity (H3), and the pressure of the membrane front cavity (H4) is equal to the water outlet pressure.
10. A constant flow combining valve as claimed in any one of claims 1 to 9 wherein: the cylinder wall of the right valve body (13) is provided with a valve front pressure detection hole (c) of the regulating valve, and the cylinder wall of the connecting pipeline II (18) is provided with a valve rear pressure detection hole (d) of the regulating valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910568181.0A CN110822143B (en) | 2019-06-27 | 2019-06-27 | Constant flow combined valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| JP2000043743A (en) * | 1998-07-27 | 2000-02-15 | Toyoda Mach Works Ltd | Flow rate control device |
| CN102853131A (en) * | 2012-08-30 | 2013-01-02 | 杭州春江阀门有限公司 | Water hammer-resistant constant-pressure pressure reducing valve |
| CN205260941U (en) * | 2015-12-14 | 2016-05-25 | 乐山川天燃气输配设备有限公司 | Axial compressor voltage regulator |
| CN106763960A (en) * | 2017-03-20 | 2017-05-31 | 四川长仪油气集输设备股份有限公司 | Piston type axle stream pressure regulator |
| CN108050281A (en) * | 2017-12-27 | 2018-05-18 | 杭州春江阀门有限公司 | Variable output pressure depressurized system |
| CN210566500U (en) * | 2019-06-27 | 2020-05-19 | 杭州春江阀门有限公司 | Constant flow combined valve |
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2019
- 2019-06-27 CN CN201910568181.0A patent/CN110822143B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000043743A (en) * | 1998-07-27 | 2000-02-15 | Toyoda Mach Works Ltd | Flow rate control device |
| CN102853131A (en) * | 2012-08-30 | 2013-01-02 | 杭州春江阀门有限公司 | Water hammer-resistant constant-pressure pressure reducing valve |
| CN205260941U (en) * | 2015-12-14 | 2016-05-25 | 乐山川天燃气输配设备有限公司 | Axial compressor voltage regulator |
| CN106763960A (en) * | 2017-03-20 | 2017-05-31 | 四川长仪油气集输设备股份有限公司 | Piston type axle stream pressure regulator |
| CN108050281A (en) * | 2017-12-27 | 2018-05-18 | 杭州春江阀门有限公司 | Variable output pressure depressurized system |
| CN210566500U (en) * | 2019-06-27 | 2020-05-19 | 杭州春江阀门有限公司 | Constant flow combined valve |
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