JP5926009B2 - Ball valve with flow measurement function and its automatic ball valve - Google Patents

Description

  In the present invention, the flow rate of the fluid in the ball valve is measured by a valve capacity coefficient obtained from the differential pressure between the upstream and downstream fluid pressures flowing in the ball valve and the valve opening amount, and is controlled to an appropriate flow rate. The present invention relates to a ball valve with a flow rate measurement function and an automatic ball valve with a flow rate measurement function such as electric / pneumatic motion.

  Energy saving measures in various fields are urgently required against the backdrop of the entry into force of the Kyoto Protocol on the prevention of global warming and the recent tightening of global energy demand. However, compared with the industrial sector, energy saving in the private sector such as offices, hotels and department stores has not progressed much. For this reason, the so-called Energy Saving Law has been revised and environmental protection regulations have been enacted, and various legal regulations for the consumer sector have been strengthened, and further energy saving efforts have become necessary.

  Since there is data that nearly 50% of the temporary energy consumption in office buildings is related to air conditioning, energy conservation measures targeting air conditioning are extremely demanding in the energy saving of office buildings.

  When building a new office building, it will not be built without considering energy conservation, and various energy conservation measures such as the installation of a thermal power generation cogeneration system and a heat pump heat source have been incorporated, producing great results. However, these are fundamental measures for air-conditioning machinery and equipment, and it is difficult to apply as an energy-saving measure for existing buildings from the aspect of capital investment, so it can be applied to existing air-conditioning equipment at a lower cost. There is a need for energy saving measures.

  In conventional central air conditioning in office buildings, cold water or hot water is made with a heat source device in the machine room, and cold / hot water is supplied to various buildings using a circulation pump and supply piping. A system is used to heat and cool the unit by exchanging heat with air. In this method, the cooling / heating temperature can be controlled by adjusting the flow rate of the cold / hot water.

  However, in the operation of such a building air conditioning system, conventionally, cold air at a constant temperature is supplied from a heat source device at a constant flow rate, whether during cooling or during heating, and is supplied according to the temperature of the day. It is not usually performed to adjust the opening of a valve provided in the piping and control the flow rate of cold / hot water.

  For this reason, the temperature of cold / hot water at the outlet of the heat source device is set to a temperature corresponding to the maximum heat load of the office building. Since it is supplied, a situation such as overcooling or overheating occurs, resulting in wasteful energy consumption. Therefore, in order to eliminate the situation of overcooling or overheating in the office building, it is necessary to control the supply amount of the cold / hot water to an appropriate flow rate corresponding to the temperature or the like.

  The flow rate of the cold / hot water can be obtained by providing an orifice in the supply pipe, providing pressure sensors on the upstream side and the downstream side of the orifice, and measuring the differential pressure of the fluid between the upstream side and the downstream side. The problem of overcooling or overheating can be solved by adjusting the opening of the valve provided in the supply piping so that the measured flow rate thus obtained matches the appropriate flow rate.

  However, since such a measurement system requires that an orifice and a pressure sensor be incorporated in series at a certain interval, a certain amount of assembly length is required, and it is incorporated later into an existing cold / hot water supply pipe. It is not easy to secure the space, and there is a problem that the installation cost increases.

  Further, the opening of the valve body is made to function as an orifice to generate a differential pressure in the fluid upstream and downstream of the valve body, and the flow rate of the fluid flowing through the valve is determined based on the differential pressure, etc. Some valves have both a flow rate measurement function and a valve function that control the flow rate of fluid flowing through the valve by adjusting the valve opening.

Patent documents 1 and patent documents 2 are known about such a valve.
In Patent Document 1, the fluid pressure in the upstream flow path from the ball valve body disposed in the valve body is downstream of the ball valve body by a conduction path formed between the valve body inner peripheral side and the upstream retainer. The fluid pressure in the flow path is taken out by a conduction path formed between the inner periphery of the valve body and the downstream retainer, and the differential pressure is measured by a differential pressure sensor, and the valve shaft rotation angle (valve opening) ) Is obtained, the flow coefficient is obtained based on the differential pressure and the valve opening, and the flow rate of the fluid flowing in the valve body is calculated from the measured value and the flow coefficient by a predetermined flow rate calculation formula. A flow control valve is described that controls the flow rate through the valve body by adjusting the valve opening based on this.

  Further, in Patent Document 2, in detecting the differential pressure between the fluid pressure in the upstream flow path and the fluid pressure in the downstream flow path from the valve body disposed in the valve body, the flow downstream of the valve body is detected. The fluid pressure detection part in the channel is the stagnation part of the fluid, that is, the part where there is no flow, and the flow rate of the fluid flowing in the valve body is calculated from the measured differential pressure and the valve opening amount of the valve body using a predetermined flow rate calculation formula. A flow control valve that controls the flow rate through the valve body by adjusting the valve opening based on the calculation result is described.

JP 2009-115302 A JP 2009-115271 A

  However, the flow control valve described in Patent Document 1 has a large number of parts constituting the valve, and high-precision machining is required to manufacture the parts. In particular, in order to form a fluid pressure conduction path between the inner periphery of the valve body and the retainer, extremely high precision is required for machining of the inner periphery of the valve body and the outer periphery of the retainer, which is a factor in increasing costs. There is a problem of becoming.

  Further, the flow rate control valve described in Patent Document 2 is provided with a fluid pressure extraction part in the fluid stagnation part in the flow path on the downstream side of the valve element, but the position of the extraction part is Since it is very close to the throttle part of the valve body, after passing through the throttle part formed by the valve body, the flow direction suddenly changes in the valve chamber, and the influence of the fluid in the turbulent state cannot be avoided. For this reason, the vicinity of the pressure take-out part does not become a complete stagnation part, and is affected by the dynamic pressure of the fluid in a turbulent state, and the differential pressure before and after the throttle part cannot be measured with high accuracy. There is also a problem that the fluid flow rate calculated based on the differential pressure is not sufficiently high. In addition to this, the flow rate control valve described in Patent Document 2 has a complicated structure in the flow path inside the valve box, and therefore, when the fluid contains foreign matter, the problem that dust clogging easily occurs. There is also.

  The present invention has been developed in order to solve the conventional problems. The purpose of the present invention is to arrange the ball valve element closer to the upstream side within a specific plane and to adjust the upstream and downstream fluid pressures. An object of the present invention is to provide a ball valve valve with a flow rate measuring function that can be taken in a stable state and can accurately measure a flow rate with a simple structure.

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a ball valve body is rotatable through a valve shaft inside a valve box having a predetermined face-to-face and provided with flanges at both ends. A fluid pressure extracting communication passage that communicates with the flow path of the valve box along the thickness of the flange is formed in each of the flanges at both ends, and the upstream and downstream fluid pressures derived from the communication passage are individually provided. The pressure sensor to be measured is fixed to the position of the upper outer end surface along the valve axis direction of the flange, the distance a from the upstream communication path to the upstream ball seat, and the downstream side The distance b from the communication path to the downstream ball seat is set to a <b, and the downstream position of the pressure sensor is fixed to the distance b by the distance b. Set the added distance, this sticking position is Measured in a stable state without being influenced by the downstream side of the turbulent flow by the distance longer be provided in the state they were set to the distance from b in between a predetermined surface, the differential pressure of the fluid pressure upstream and downstream a flow amount measurement function ball valve which is adapted to compute the flow rate of a fluid ball valve to control the proper fluid flow by a signal and valve opening valve capacity coefficient obtained from metric.

According to a second aspect of the present invention, a ball valve body is provided inside the valve box having a predetermined face-to-face and comprising a body portion having a flange and a cap portion having a flange, and the ball valve body is rotated. The moving valve shaft is mounted on the valve shaft cylinder, and an electric actuator is mounted on the upper part of the valve shaft cylinder, and the upstream and downstream fluid pressures are individually applied to the upper outer end surfaces of both flanges located below the electric actuator. The pressure sensors to be measured are fixed along the valve axis direction, the communication passages for pressure extraction are respectively drilled along the thickness of the flange, and from the upstream communication passage to the upstream ball seat And a distance b from the downstream communication path to the downstream ball seat, the relationship is a <b, and the downstream position of the pressure sensor is fixed at the distance b. Downstream of the station The length of the road is set to the sum of the distances, and the fixed position is set at a distance longer than the distance b between the predetermined surfaces, thereby reducing the influence of turbulent flow on the downstream side. receiving it are measured in a stable state without the valve capacity determined from a differential pressure signal and valve opening degree amount of the fluid pressure upstream and downstream by measuring the fluid pressure upstream and downstream of the exit guide from the communication passage by the pressure sensor by calculating the coefficients a flow rate measuring function with automatic ball valve so as to control the proper fluid flow.

According to a third aspect of the present invention, a ball valve body having a fan-shaped outlet is provided in the body portion, and the ball valve body is built closer to the upstream side, and the cap portion positioned on the downstream side of the body portion via a bolt. It is an automatic ball valve with a flow rate measurement function that is assembled into a valve box.

In the invention according to claim 4 , the ratio of the distance a from the upstream communication path to the upstream ball seat and the distance b from the downstream communication path to the downstream ball seat is 1: 4. flow rate measurement function with scale Rubarubu was and its automatic ball valve.

According to the first aspect of the invention, the upstream and downstream fluid pressures can be measured at the outermost part of the valve box, so that the pressure loss can be measured with a small value, so that the pressure measurement is performed with high accuracy. Moreover, since the measurement site is located as far as possible from the ball valve body on the downstream side, more accurate measurement is possible.

  According to the second aspect of the present invention, the pressure can be stably detected regardless of the position of the ball valve body by disposing the pressure sensor on the upper outer end surface of the flange. The pressure detection position on the downstream side can be arranged as far away from the ball valve body as possible within the limited plane, and the ball between the planes The pressure can be detected at a position farthest from the valve body, and the fluid pressure can be detected particularly at a position where the flow on the downstream side is stable. Further, since the pressure sensor is arranged between the actuator and the valve box, the pressure sensor and its wiring do not jump out of the actuator and the valve, so that it can be arranged compactly and piping work can be facilitated.

According to the invention of claim 3 , by using a two-piece structure of the body part and the cap part, the flow path inside the valve box becomes a smooth structure, dust clogging is less likely to occur, and a ball valve element is attached to the body part. Since it is provided, it becomes possible to arrange the ball valve element inside the upstream side of the valve box.

According to the fourth aspect of the present invention, the pressure detection on the downstream side can be reliably measured in a stable fluid flow between the limited surfaces.

It is sectional drawing which showed an example of the electric ball valve with a flow measurement function in this invention. It is a right view of FIG. It is the perspective view which looked at the electric ball valve of Drawing 1 from the slanting lower part. It is a perspective view of the valve box part which showed other examples of the electric ball valve with a flow measurement function in the present invention.

Hereinafter, an embodiment of an electric ball valve with a flow rate measurement function according to the present invention will be described in detail with reference to the drawings.
1 is a cross-sectional view of an electric ball valve with a flow rate measuring function according to the present invention, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is an oblique view of the electric ball valve of FIG. A perspective view is shown.

  As shown in FIG. 1, an electric ball valve with a flow rate measuring function according to the present invention has a valve box 5 formed by combining a body part 2 having a flange 1 at one end and a cap part 4 having a flange 3 at one end. A ball valve body 6 is rotatably provided, a valve shaft 7 for rotating the ball valve body 6 is mounted on the valve shaft cylinder 8, and an electric actuator 9 is mounted on the valve shaft cylinder 8. Pressure sensors 10 and 11 are fixed to the upper outer end surfaces of the flanges 1 and 3, respectively.

  In the body portion 2, a flow path 2 a and a storage portion 2 b for the ball valve body 6 are formed inside, and a communication passage 12 is bored from the upper outer end surface of the flange 1 along the thickness of the flange 1. In order to guide the fluid pressure in the flow path 2a, it communicates with the flow path 2a.

  Further, on the upper side of the body portion 2, a valve shaft cylinder 8 for mounting the valve shaft 7 is integrally extended, and a mounting portion 22 for mounting the actuator 9 is formed on the upper portion of the valve shaft cylinder 8. Yes. The electric actuator 9 is fixed to the mounting portion 22 by appropriate attaching means.

  On the other hand, the cap portion 4 is formed with a flow path 4a, and a communication path 13 is bored from the upper outer end surface of the flange 3 along the thickness of the flange 3 to connect the fluid pressure in the flow path 4a. In order to lead to the passage 13, it communicates with the flow path 4a.

  A cap portion 4 is screwed and connected to the downstream side of the body portion 2 with a bolt 17 to form a valve box 5. In the valve box 5, a ball seat 18 accommodated in a ball seat accommodating part 20 of the body part 2 and a ball sheet 19 rotatably supported by a ball sheet 19 accommodated in the body sheet accommodating part 21 of the cap part 4. A valve body 6 is provided. The ball valve body 6 is formed with a communication hole 6 a having a fan-shaped outlet 16.

  The ball valve body 6 is accommodated in an accommodating portion 2b provided on the body portion 2 side constituting the valve box 5, and the ball valve as a whole is disposed in the valve box 5 so as to be offset upstream. As shown in FIG. 1, this offset state is the distance a from the upstream communication path 12 to the upstream ball seat 18 and the downstream communication path 13 to the downstream ball seat 19. The ratio to the distance b is 1: 4.

  The valve shaft 7 is mounted on the valve shaft cylinder 8, a lower end protruding from the valve shaft cylinder 8 is connected to the center of the upper surface of the ball valve body 6, and an upper end protruding above the valve shaft cylinder 8 is an electric actuator. 9 is connected to an output shaft (not shown).

  The electric actuator 9 is screwed to a mounting portion 22 provided at the upper end of the valve shaft cylinder 8 with a bolt 23. The electric actuator 9 is provided with an unillustrated motor, a speed reduction mechanism, a limit switch, and the like, as well as an opening sensor for detecting the valve opening of the ball valve body 6 and detection of the valve opening and pressure sensor. A flow rate measuring function means that appropriately incorporates a CPU, a memory, and the like for calculating the fluid flow rate based on the data, and a valve opening degree control function means as necessary are provided.

  In this example, the pressure sensors 10 and 11 use semiconductor pressure sensors. In FIG. 1, the pressure sensors 10 and 11 are screwed and attached to the screw portions 1 a and 3 a formed in the openings of the upper outer end surfaces of the flanges 1 and 3. The openings of the threaded portions 1 a and 3 a communicate with the communication passages 12 and 13.

  The pressure data of the flow path 2a and the flow path 4a detected by the pressure sensors 10 and 11 is sent to the flow rate measuring function means inside the electric actuator 9 via the wiring 24 connecting the pressure sensors 10 and 11 and the electric actuator 9. It is done.

  In FIG. 1, the wiring 24 for transmitting the pressure data detected by the pressure sensors 10 and 11 to the flow measurement function unit of the electric actuator 9 is schematically represented by a thin line, but actually, as shown in FIG. 3. In addition, a plurality of conducting wires are arranged around the ventilation tube that opens the secondary atmosphere of the pressure sensors 10 and 11, and the surroundings are further protected by being wrapped with a horizontal shielding shield, a vinyl sheath, or the like. This is an open tube integrated cable 25.

  As shown in FIG. 4, in this embodiment, a pair of protrusions 14 and 15 are formed integrally with the flanges on the upper outer end surfaces of the flanges 1 and 3 with the pressure sensors 10 and 11 sandwiched therebetween. ing.

  For this reason, since the pressure sensors 10 and 11 are firmly protected from both sides by the protrusions 14 and 15, even if the work is performed around the electric ball valve after installation, the pressure sensors 10 and 11 are attached to the cuffs of the work clothes. There is no risk of damage by catching or hitting tools.

  In addition, when the electric ball valve is installed on the outdoor piping in a state of being laid down, it is possible to prevent rain to some extent, and to protect the pressure sensor from rain water that flows down the outer end face of the flange.

  In the electric ball valve with a flow rate measuring function according to the present invention, the valve box 5 has a two-piece structure including the body part 2 and the cap part 4, so that the assembly is easy and the flow path inside the valve box 5 has a smooth structure. Even if the cold / hot water contains foreign matter, clogging of dust is unlikely to occur.

  Further, since the communication paths 12 and 13 for deriving the fluid pressure to the pressure sensors 10 and 11 are formed in the flanges 1 and 3 on both the upstream side and the downstream side, the influence of the flow disturbance caused by the ball valve body 6 is affected. Since the fluid pressure can be derived at the farthest position that does not reach, accurate fluid pressure can be detected.

  Furthermore, since the communication passages 12 and 13 for deriving the fluid pressure on both the upstream side and the downstream side of the ball valve body 6 are connected to the upper positions of the flow paths 2a and 4a, the closed ball valve body 6 is When the flow path starts to open in the counterclockwise direction when viewed from the top, the flow path starts to open from the left side of the bore when viewed from the downstream side of the ball valve body. Since the flow on the downstream side of the ball valve body becomes a turbulent flow and is not affected by the phenomenon that the pressure in the flow path becomes unbalanced, it is possible to derive an accurate fluid pressure.

  As described above, the detection position of the fluid pressure is provided at a position farthest from the ball valve body 6, and the left-right imbalance of the pressure in the flow path caused by the deviation of the opening of the ball valve body in the left-right direction. Since the fluid pressure is derived from the upper part of the flow path that is not affected, the fluid pressure can be detected with high accuracy.

  In addition to this, the housing portion 2b of the ball valve body 6 is provided on the body portion 2 side, and the ball valve body 6 is disposed on the upstream side of the entire valve box 5. By disposing the ball valve body 6 closer to the upstream side of the entire valve box 5, the influence of the turbulent flow generated by the opening of the ball valve body 6 is limited between the limited surfaces. Therefore, the flow path length of the downstream flow path 4a can be set sufficiently long.

  In this embodiment, as shown in FIG. 1, a distance a from the upstream communication path 12 to the upstream ball seat 18 and a distance b from the downstream communication path 13 to the downstream ball seat 19 The ratio is set to 1: 4 so that the influence of the turbulent flow generated by the opening of the ball valve body 6 does not reach the downstream communication passage 13.

  The ratio of the distance a from the upstream communication path 12 to the upstream ball seat 18 and the distance b from the downstream communication path 13 to the downstream ball seat 19 is 1: 4 in this embodiment. However, the distance b on the downstream side needs to be set sufficiently larger than the distance a on the upstream side.

  The pressure data of the flow path 2a and the flow path 4a detected by the upstream pressure sensor 10 and the downstream pressure sensor 11 are passed through an air release tube integrated cable 25 that connects the pressure sensors 10, 11 and the electric actuator 9. Then, it is sent to the flow rate measuring function means inside the electric actuator 9 and used to calculate the measured flow rate of the fluid flowing in the valve box 5.

  The flow rate measuring function means in the electric actuator 9 obtains the differential pressure Δp between the upstream and downstream of the ball valve body 6 based on the pressure data from the upstream pressure sensor 10 and the downstream pressure sensor 11, and this differential pressure The flow rate Q of the fluid flowing in the flow path in the valve box 5 is calculated from Δp and the flow rate coefficient Cv value corresponding to the valve opening degree θ from the valve opening degree detecting means.

  The calculated flow rate Q is also sent to the valve opening degree control function means in the electric actuator 9, and the valve opening degree is controlled so that the flow rate Q matches the set flow rate value.

  Further, as shown in FIG. 1, the pressure sensors 10 and 11 are disposed between the actuator 9 and the upper outer end surfaces of the flange 1 and the flange 3, so that the pressure sensors 10 and 11 are convex in appearance. In addition to being compact, there is little possibility that an operator will come into contact with the pressure sensors 10 and 11 to cause damage during piping work or maintenance work. That is, the pressure sensors 10, 11 and the open air tube-integrated cable 25 can be arranged in the area a shown by the two-dot chain line in FIG. 2 (the area where the bottom surface of the electric actuator 9 is projected on the ball valve side). Contributes significantly to the improvement of stability.

  In this embodiment, as shown in FIG. 1, in principle, the electric ball valve is installed with piping in an upright state with the electric actuator 9 on the upper side. However, if the existing piping has no space and cannot be used in an upright state, the electric actuator 9 can be externally installed for maintenance or the like even if the electric actuator 9 is laid down 90 degrees to the left or right. Because it is easy to access the pipe, it is possible to install the pipe even in a lying state. For this reason, since it can be applied to most existing piping, its utility value is great.

Next, an operation example in the above-described embodiment of the electric ball valve with a flow rate measurement function in the present invention will be described.
First, in the control room of an office building or the like, estimate the heat load of the building corresponding to the climate and weather of the day, determine the flow of cold / hot water according to the estimated heat load, and supply the flow data to the cold / hot water supply piping Is transmitted to the CPU or the like of the valve opening degree control function means in the electric actuator of the electric ball valve with a flow rate measuring function installed in. After that, cold and hot water made with a heat source device is supplied to various parts of the building by a circulation pump and supply piping.

  The cold / hot water supplied to the piping passes through the electric ball valve provided in the piping, and is supplied to the fan coil unit provided in the supply destination in the building to exchange heat with the air and to air-condition the supply destination. .

  Initially, when cold and hot water passes through the electric ball valve, the ball valve body 6 is opened at an appropriate opening degree, and the flow path in the valve chamber 5 is in a state of being throttled by the ball valve body 6. ing. For this reason, an orifice effect is generated by the throttle portion of the ball valve body 6, and a pressure difference is generated in the fluid between the upstream side and the downstream side of the ball valve body 6.

  The pressure of the fluid in the upstream flow path 2a of the ball valve body 6 is detected by the pressure sensor 10 through the communication path 12 communicating with the flow path 2a. The pressure center 10 generates an electrical signal proportional to the pressure and transmits the electrical signal to the flow rate measuring function means in the actuator 9 via the wiring 24.

  Similarly, the pressure of the fluid in the downstream flow path 4a of the ball valve body 6 is detected by the pressure sensor 11 via the communication path 13 communicating with the flow path 4a. The pressure sensor 11 generates an electric signal proportional to the pressure and transmits the electric signal to the flow rate measuring function means in the actuator 9 via the wiring 24.

  The flow rate measuring function means is generated by passing through the throttle portion by the ball valve body 6 from the transmitted electrical signal of the fluid pressure of the upstream flow path 2a and the electrical signal of the fluid pressure of the downstream flow path 4a. The differential pressure Δp of the fluid is obtained. At the same time, based on the rotation angle data from the opening sensor of the valve shaft 7 (valve opening of the ball valve 6), the flow coefficient Cv of the throttle portion by the ball valve body 6 is obtained, and the valve box is obtained from the differential pressure and the flow coefficient. The flow rate Q of the fluid flowing through the inside 5 is calculated.

The valve in this example measures the flow rate of cold / hot water used in an air conditioner such as a building. The flow rate of the fluid can be measured by the principle of an orifice flow meter. According to this principle, the flow rate Q is
Q = (Cv / k) · √ΔP
It can ask for. Here, k is a coefficient for unit adjustment and is a fixed value. Cv is a capacity coefficient of the valve and changes depending on the opening of the valve. Therefore, the volume of the fluid passing through the valve can be obtained from the valve capacity coefficient Cv and the differential pressure ΔP.
On the other hand, the measurement value of the pressure sensor that measures the differential pressure ΔP is affected by the ambient temperature to be measured. For this reason, in order to obtain the fluid flow rate more accurately, it is necessary to measure the temperature of the fluid and to correct the temperature of the measured value of the pressure sensor based on the measured temperature.
The fluid passing through the valve in this example is cold / warm water used in an air conditioner such as a building, and the temperature is approximately 5 to 10 ° C. for cooling and 50 to 60 ° C. for heating. Therefore, if the measurement value of the pressure sensor is corrected only in the temperature zone of the cold / hot water to be used, the temperature measurement circuit becomes unnecessary, and the cost for that can be greatly reduced. Specifically, one each of a pressure sensor correction coefficient corresponding to 5 to 10 ° C. which is a fluid temperature in the case of cooling and a pressure sensor correction coefficient corresponding to 50 to 60 ° C. which is a fluid temperature in the case of heating. By preparing and switching the applied pressure sensor correction coefficient according to whether the operation category of the air conditioner is cooling or heating, it is possible to measure the differential pressure ΔP with high accuracy and obtain the accurate fluid flow rate. it can.

  Note that the set flow rate given by the controller (not shown) is compared with the measured flow rate Q calculated by the flow rate measuring function means, and the valve shaft 7 connected to the output shaft is connected so that the measured flow rate Q matches the set flow rate. Then, the ball valve body 6 is rotated to adjust the valve opening, and the flow rate of the fluid flowing through the valve box 5 is controlled.

  Conventionally, when the temperature is adjusted by reducing the flow rate with a valve, the pressure loss of the valve is energy loss. By reducing the production amount of cold / hot water by the heat source device based on the detected flow rate, the energy for pump conveyance is reduced, and if the valve is opened, the necessary flow rate can be secured with low pump energy. Therefore, the energy for air conditioning used in the building can be optimized to save energy.

  In addition, even if the flow rate Q of cold / hot water matches the set flow rate, if air conditioning is too effective or conversely insufficient, by setting the flow rate of cold / hot water from the control room appropriately increased or decreased, The electric valve can automatically control the flow rate of cold / hot water to improve the air conditioning effect.

  In addition, the air-conditioning effect at each place in the building is not the same even if cold / hot water having the same flow rate is supplied because the influence of heat received from the outside of the building differs depending on the place. Even in such a case, if the electric ball valve with a flow rate measuring function according to the present invention is used, the supply of cold / hot water is finely supplied for each supply destination to the plurality of electric valves provided in the supply / cooling water supply pipe. The amount can be easily set as needed, and the air conditioning effect for the entire building can be optimized.

  The electric ball valve with a flow rate measuring function in the present invention is not only simple in structure and inexpensive in acquisition price, but can be attached to a conventional piping facility by simply replacing the existing valve, and no separate piping work is required. . In addition, the flow of cold / hot water used for air conditioning can be measured and controlled with high accuracy to prevent overcooling and overheating, and the air conditioning energy used in the building can be optimized to save energy. Furthermore, the supply flow rate of cold / hot water to each valve can be set by data transmission from the control room, and no extra manpower is required. Therefore, some of its practical value and economic value are very large.

DESCRIPTION OF SYMBOLS 1 Flange 2 Body part 3 Flange 4 Cap part 5 Valve chamber 6 Ball valve body 9 Electric actuator 10, 11 Pressure sensor 12, 13 Communication path 14, 15 Protrusion part 16 Fan-shaped outlet

Claims (4)

A ball valve element is rotatably provided through a valve shaft inside a valve box having a predetermined plane and flanges at both ends, and the valve box flows along the thickness of the flange . A fluid pressure extracting communication passage communicating with the passage is formed in each of the flanges at both ends, and pressure sensors for individually measuring the upstream and downstream fluid pressures derived from the communication passage are provided along the valve axis direction of the flange. And fixed at the position of the upper outer end surface, the distance a from the upstream communication path to the upstream ball seat, and the distance b from the downstream communication path to the downstream ball seat, The relationship is a <b, and the fixing position of the pressure sensor on the downstream side is set to a distance obtained by adding the length distance of the communication path on the downstream side to the distance b. A distance longer than the distance b Measured in a stable state without being influenced by downstream turbulence by being provided to the set state, the valve capacity coefficient obtained from the differential pressure signal and valve opening degree amount of the fluid pressure upstream and downstream of the ball valve A ball valve with a flow rate measurement function, wherein the flow rate of fluid is calculated and controlled to an appropriate fluid flow rate. A ball valve body is provided inside the valve box, which has a predetermined face-to-face and includes a body portion having a flange and a cap portion having a flange, and a valve shaft that rotates the ball valve body is a valve shaft cylinder. to JikuSo, an electric actuator mounted on the upper portion of the valve shaft cylinder, said valve a pressure sensor for measuring separately the fluid pressure upstream and downstream to the upper outer end surface of the flange both located below the electric actuator Each of them is fixed along the axial direction, a communication passage for pressure extraction is formed along the thickness of the flange, and the distance a from the upstream communication passage to the upstream ball seat is set to the downstream. The distance b from the communication path on the side to the ball seat on the downstream side is defined as a <b, and the fixing position of the pressure sensor on the downstream side is the length of the communication path on the downstream side at the distance b. Add the distance This fixed position is measured in a stable state without being affected by turbulent flow on the downstream side by being provided in a state where the fixed position is set to a distance longer than the distance b in a predetermined plane. It is appropriate to the calculated and the valve capacity coefficient difference obtained from pressure signal and valve opening degree amount of the fluid pressure upstream and downstream by measuring the fluid pressure upstream and downstream of the exit guide from the communication passage by the pressure sensor An automatic ball valve with a flow rate measurement function, which is controlled to a fluid flow rate. A ball valve body having a fan-shaped outlet is provided in the body portion, and the ball valve body is built on the upstream side, and the cap portion located on the downstream side is assembled to the body portion via a bolt to constitute a valve box The automatic ball valve with a flow rate measuring function according to claim 2. The ratio of the distance a from the upstream communication path to the upstream ball seat and the distance b from the downstream communication path to the downstream ball seat is 1: 4. Ball valve with flow measurement function and its automatic ball valve.

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