A flow control valve based on rotational speed for flow rate adjustment

Abstract

The present invention discloses a regulating valve for regulating flow based on rotational speed, which comprises a main shaft rotatably supported by a housing and a regulating valve installed outside the housing at one end of the main shaft, a rotating seat installed on the main shaft and located inside the housing, a sliding cavity is formed in the main shaft, a through groove communicating with the sliding cavity is formed on the main shaft, L-shaped swing arms are symmetrically and rotatably arranged on the rotating seat, a weight is installed at the outer end of the L-shaped swing arm, when the main shaft rotates, the inner end of the L-shaped swing arm is used to push the sliding rod installed in the sliding cavity to displace, a valve core linked with the sliding rod is installed in the regulating valve, the valve core at least comprises a conical section, when the valve core displaces along with the sliding rod, the conical section is used to control the flow rate; a relay member is arranged between the sliding rod and the valve core, and the relay member is used to filter the rotational movement of the main shaft.

Description

Technical Field

[0001] The present invention relates to the technical field of fire-fighting equipment, and particularly to a regulating valve for adjusting flow rate based on rotational speed. Background Art

[0002] In a foam fire-fighting system, water and foam concentrate are usually mixed in a set ratio and then sprayed as fire-fighting liquid onto a fire scene for extinguishing fires. Currently, in such a foam fire-fighting system, there are usually two ways to supply foam concentrate. One is a storage tank pressure type foam proportioning device, whose disadvantage is that the supply amount of foam solution is limited and does not meet the requirements of large-scale foam fire-fighting projects; the other is a mechanical pumping type. In this method, a certain amount of foam concentrate is continuously input by a foam pump and mixed with water in a fire-fighting pipeline to obtain a foam solution with a set ratio. The characteristic of this method is that it can quickly produce a large amount of foam solution and can meet the needs of large-scale fire-fighting projects. Since the amount of foam concentrate supplied by the mechanical pumping type is fixed and cannot change synchronously according to the change in water volume, its limitations in practical applications are obvious. Here, the key is to develop a regulating valve that can automatically control the supply amount of foam concentrate according to the size of the fire-fighting water flow rate to solve the deficiencies of the mechanical pumping type foam fire-fighting system. Summary of the Invention

[0003] The purpose of the present invention is to provide a regulating valve for adjusting flow rate based on rotational speed to solve the problems in the prior art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A regulating valve for adjusting flow rate based on rotational speed, including a main shaft 2 rotatably supported by a housing 1 and a regulating valve 8 installed outside the housing 1 at one end of the main shaft 2, a rotating seat 3 installed on the main shaft 2 and located inside the housing 1. A sliding cavity 201 is opened in the main shaft 2, and a through groove 202 communicating with the sliding cavity 201 is opened on the main shaft 2. L-shaped swing arms 4 are symmetrically and rotatably arranged on the rotating seat 3. A weight 5 is installed at the outer end of the L-shaped swing arm 4. When the main shaft 2 rotates, the inner end of the L-shaped swing arm 4 is used to push a slide rod 6 installed in the sliding cavity 201 to displace. A valve core 806 linked with the slide rod 6 is installed in the regulating valve 8. The valve core 806 at least includes a conical section 8062. When the valve core 806 displaces with the slide rod 6, the conical section 8062 is used to control the flow rate; a relay member 7 is arranged between the slide rod 6 and the valve core 806, and the relay member 7 is used to filter the rotational movement of the main shaft 2.

[0005] Further, the housing 1 includes a left half housing 101 and a right half housing 102 detachably connected by connecting bolts 11.

[0006] Further, the relay member 7 includes a flange shaft 701 and a receiving cavity 601 provided at the corresponding end of the sliding rod 6. One end of the flange shaft 701 extending into the receiving cavity 601 is in rolling contact and cooperation with a steel ball 702 installed in the receiving cavity 601, and the other end of the flange shaft 701 is connected to the valve core 806.

[0007] Further, the bottom of the receiving cavity 601 is a conical bottom, and the steel balls 702 are evenly distributed on the conical bottom and surround the outer circumference of the shaft portion of one end of the flange shaft 701 extending into the receiving cavity 601 and cooperate with its flange end face.

[0008] Further, the corner of the L-shaped swing arm 4 is hinged to the rotating seat 3 through a pin shaft 12. The inner end of the L-shaped swing arm 4 passes through the through groove 202 and extends into the sliding cavity 201. The outer end of the L-shaped swing arm 4 faces the regulating valve 8, and the pin shaft 12 is perpendicular to the main shaft 2.

[0009] Further, the flow regulating valve based on rotational speed also includes a push block 9. The push block 9 has a T-shaped structure. The shaft rod portion of the push block 9 is connected to the end of the sliding rod 6 away from the valve core 806. The outer end face of the cross bar portion of the push block 9 is provided with a working surface 901. A roller 10 is installed at the inner end of the L-shaped swing arm 4 and is in contact and cooperation with the working surface 901. The length of the through groove 202 is adapted to the stroke of the push block 9.

[0010] Further, the regulating valve 8 includes a valve body 802 connected to the right half shell 102, a liquid inlet 803 and a liquid outlet 805 coaxially arranged on the side wall of the valve body, a valve cover 801 screwed on the outer end of the valve body 802. The valve core 806 is slidably installed in the valve body 802. The valve core 806 further includes a sealing section 8061 and a push rod section 8063 integrally connected to both ends of the conical section 8062 respectively. The sealing section 8061 is slidably fitted in the valve body 802 to disconnect the liquid inlet 803 and the liquid outlet 805. The push rod section 8063 extends out of the valve body 802 and the front end is fixedly connected to the flange shaft 701. A spring 804 is provided between the sealing section 8061 and the valve cover 801.

[0011] Further, two weights 5 are symmetrically installed at the outer end of each L-shaped swing arm 4. The weights 5 are bullet-shaped, and the center line of the two weights 5 is tangent to the rotation direction of the main shaft 2. The small ends of the weights 5 all face outward.

[0012] Working principle and beneficial effects of the present invention: The regulating valve based on rotational speed for flow regulation provided by the present invention is applied to a foam fire protection system. The liquid inlet bypass is connected to the output pipeline of a foam pump, and the liquid outlet is communicated with a foam liquid storage tank. Here, the output pipeline of the foam pump supplies foam concentrate to the main pipeline of the foam fire protection system. The main shaft is linked to the output shaft of a turbine installed on the main pipeline of the foam fire protection system. The turbine is driven by the fire protection liquid flowing in the main pipeline of the foam fire protection system, and its rotational speed is controlled by the flow rate of the fire protection liquid. In this way, the rotational speed of the main shaft is related to the flow rate (flow) of the fire protection liquid. When the rotational speed of the main shaft increases, the outer end of the L-shaped swing arm rotates around the main shaft with an increased radius of gyration under the action of centrifugal force, that is, the L-shaped swing arm rotates around the pin shaft so that its inner end pushes the push block to drive the slide rod forward, thereby pushing the valve core forward. When the sealing section of the valve core leaves the openings of the liquid inlet and the liquid outlet in the valve body, the conical section forms a through-diameter related to the displacement of the conical section with this opening. In this way, the amount of foam liquid flowing back from the output pipeline of the foam pump to the foam liquid storage tank through the regulating valve can be adjusted steplessly, realizing the automatic adjustment of the mixing ratio of the foam liquid and the fire protection water. By changing the design direction and position of the conical section, proportional regulation and inverse proportional regulation can be conveniently achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a cross-sectional view of the present invention;

[0014] Figure 2 is Figure 1 sectional view A-A in

[0015] Figure 3 is a perspective view of the present invention;

[0016] Figure 4 is a perspective view of the present invention after removing the left half housing. EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figures 1-4, A flow control valve based on rotational speed regulation, comprising a main shaft 2 rotatably supported by a housing 1 and a control valve 8 installed outside the housing 1 at one end of the main shaft 2, a rotating seat 3 installed on the main shaft 2 and located inside the housing 1, a sliding cavity 201 is formed in the main shaft 2, a through groove 202 communicating with the sliding cavity 201 is formed on the main shaft 2, L-shaped swing arms 4 are symmetrically and rotatably arranged on the rotating seat 3, a weight 5 is installed at the outer end of the L-shaped swing arm 4, when the main shaft 2 rotates, the inner end of the L-shaped swing arm 4 is used to push a slide bar 6 installed in the sliding cavity 201 to displace, a valve core 806 linked with the slide bar 6 is installed in the control valve 8, the valve core 806 at least includes a tapered section 8062, when the valve core 806 displaces along with the slide bar 6, the tapered section 8062 is used to control the flow rate; a relay member 7 is arranged between the slide bar 6 and the valve core 806, and the relay member 7 is used to filter the rotational movement of the main shaft 2.

[0019] Preferably, the housing 1 includes a left half housing 101 and a right half housing 102 detachably connected by connecting bolts 11. In this way, it is convenient to install other related components of the main shaft 2, which is beneficial to improving production efficiency and the convenience during maintenance, saving time and effort; for key reference Figure 1 and Figure 2 In this embodiment, the other end of the main shaft 2 extends out of the left half housing 101 for transmission connection with a power source. Here, the power source is usually a turbine installed on the main pipeline of the foam fire fighting system or a servo motor controlled by the foam fire fighting system.

[0020] Preferably, the relay member 7 includes a flange shaft 701 and a receiving cavity 601 arranged at the corresponding end of the slide bar 6. One end of the flange shaft 701 extending into the receiving cavity 601 is in rolling contact and cooperation with steel balls 702 installed in the receiving cavity 601, and the other end of the flange shaft 701 is connected with the valve core 806. In this way, when the main shaft 2 drives the slide bar 6 to rotate and the slide bar 6 generates displacement under the push of the L-shaped swing arm 4, the rotational movement of the slide bar 6 is filtered out by the rolling of the steel balls 702, avoiding the rotation of the valve core 806, so that the valve core 806 only has a simple axial displacement movement, effectively avoiding excessive wear of the valve core 806, and improving the use accuracy and service life of the control valve. Here, the relay member 7 can also adopt a bearing.

[0021] Preferably, the bottom of the receiving cavity 601 is a tapered bottom, the steel balls 702 are evenly distributed on the tapered bottom and surround the outer circumference of the shaft portion of one end of the flange shaft 701 extending into the receiving cavity 601 and cooperate with its flange end face. In this way, the contact accuracy of the steel balls 702 during operation can be ensured, the accuracy of displacement transmission can be guaranteed, and thus the adjustment accuracy of the control valve can be ensured.

[0022] Preferably, the corner of the L-shaped swing arm 4 is hinged to the rotating seat 3 through a pin shaft 12. The inner end of the L-shaped swing arm 4 extends into the sliding cavity 201 through the through slot 202. The outer end of the L-shaped swing arm 4 faces the regulating valve 8. The pin shaft 12 is perpendicular to the main shaft 2. Here, the rotating seat 3 is connected to the main shaft 2 through a locking screw 13 to ensure the stable position of the rotating seat 3.

[0023] As a preferred embodiment, the regulating valve based on speed regulation of flow rate further includes a push block 9. The push block 9 is of a T-shaped structure. The shaft rod part of the push block 9 is connected to the end of the sliding rod 6 away from the valve core 806. The outer end face of the cross bar part of the push block 9 is provided with a working surface 901. A roller 10 is installed at the inner end of the L-shaped swing arm 4 and is in contact and cooperation with the working surface 901. The length of the through slot 202 is adapted to the stroke of the push block 9. Thus, when the L-shaped swing arm 4 rotates around the pin shaft 12 under the action of the rotation of the main shaft 2, when the roller 10 pushes the push block 9 forward, the roller 10 rolls on the working surface 901, significantly reducing the friction effect between components and improving the sensitivity and reliability of the regulating valve. Here, the working surface 901 can be a flat surface or can be set as an arc surface. Referring to the appendix Figure 1 , in this embodiment, an arc surface structure is adopted.

[0024] As a preferred embodiment, the regulating valve 8 includes a valve body 802 connected to the right half shell 102, a liquid inlet 803 and a liquid outlet 805 coaxially arranged on the side wall of the valve body, a valve cover 801 screwed on the outer end of the valve body 802, a valve core 806 slidably installed in the valve body 802. The valve core 806 further includes a sealing section 8061 and a push rod section 8063 integrally connected to both ends of the conical section 8062 respectively. The sealing section 8061 is slidably matched in the valve body 802 for disconnecting the liquid inlet 803 and the liquid outlet 805. The push rod section 8063 extends out of the valve body 802 and the front end is fixedly connected to the flange shaft 701. A spring 804 is arranged between the sealing section 8061 and the valve cover 801. The spring 804 enables the valve core 806 to automatically reset and at the same time provides an initial closing force to the valve core 806, that is, only when the rotational speed of the main shaft 2 reaches the set value, the thrust generated by the L-shaped swing arm 4 on the sliding rod 6 under the centrifugal force of the weight 5 is greater than the force of the spring 804 can the valve core 806 be displaced.

[0025] As a preferred embodiment, two weights 5 are symmetrically installed at the outer end of each L-shaped swing arm 4. The weights 5 are bullet-shaped and the center line of the two weights 5 is tangent to the rotation direction of the main shaft 2. The small ends of the weights 5 all face outwards. Thus, when the main shaft 2 rotates, the resistance generated by the weights 5 on the main shaft 2 is small, which is beneficial to improving the sensitivity.

[0026] The regulating valve based on rotational speed for flow regulation provided by the present invention is applied to a foam fire extinguishing system. The liquid inlet bypass is connected to the output pipeline of a foam pump, and the liquid outlet is communicated with a foam liquid storage tank. Here, the output pipeline of the foam pump supplies foam concentrate to the main pipeline of the foam fire extinguishing system. The main shaft is linked with the output shaft of a turbine installed on the main pipeline of the foam fire extinguishing system. The turbine is driven by the fire-fighting liquid flowing in the main pipeline of the foam fire extinguishing system, and its rotational speed is controlled by the flow rate of the fire-fighting liquid. In this way, the rotational speed of the main shaft is related to the flow rate (flow) of the fire-fighting liquid. Here, the turbine can also be replaced by a flow sensor to detect the flow rate of the fire-fighting liquid in real time. The main shaft is driven by a servo motor, and the rotational speed of the servo motor, that is, the rotational speed of the main shaft 2, is controlled through the signal of the flow sensor. When the rotational speed of the main shaft 2 increases, the outer end of the L-shaped swing arm 4 increases its radius of gyration around the main shaft 2 under the action of centrifugal force, that is, the L-shaped swing arm 4 rotates around the pin shaft 12 so that its inner end pushes the push block 9 to drive the slide bar 6 to move forward, thereby pushing the valve core 806 forward. When the sealing section 8061 of the valve core 806 leaves the openings of the liquid inlet 803 and the liquid outlet 805 in the valve body, the conical section 8062 forms a through diameter related to the displacement of the conical section 8062 with this opening. In this way, the amount of foam liquid flowing back from the output pipeline of the foam pump to the foam liquid storage tank through the regulating valve 8 can be adjusted steplessly, and the mixing ratio of the foam liquid and the fire-fighting water can be automatically adjusted. By changing the design direction and position of the conical section, the proportional and inverse proportional regulations can be conveniently realized.

[0027] It should be noted that in this text, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated herein is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flow control valve based on rotational speed adjustment for flow rate, characterized in that: It includes a main shaft (2) rotatably supported by a housing (1), a regulating valve (8) installed outside the housing (1) at one end of the main shaft (2), and a rotating seat (3) installed on the main shaft (2) and located inside the housing (1). A sliding cavity (201) is formed in the main shaft (2), and a through groove (202) communicating with the sliding cavity (201) is formed on the main shaft (2). L-shaped swing arms (4) are symmetrically and rotatably arranged on the rotating seat (3). A weight (5) is installed at the outer end of the L-shaped swing arm (4). When the main shaft (2) rotates, the inner end of the L-shaped swing arm (4) is used to push a slide rod (6) installed in the sliding cavity (201) to displace. A valve core (806) linked with the slide rod (6) is installed in the regulating valve (8). The valve core (806) at least includes a conical section (8062). When the valve core (806) displaces along with the slide rod (6), the conical section (8062) is used to control the flow rate. A relay member (7) is arranged between the slide rod (6) and the valve core (806), and the relay member (7) is used to filter the rotational movement of the main shaft (2). The corner of the L-shaped swing arm (4) is hinged to the rotating seat (3) through a pin shaft (12). The inner end of the L-shaped swing arm (4) extends into the sliding cavity (201) through the through groove (202). The outer end of the L-shaped swing arm (4) faces the regulating valve (8), and the pin shaft (12) is perpendicular to the main shaft (2). It further includes a push block (9). The push block (9) has a T-shaped structure. The shaft rod part of the push block (9) is connected to the end of the slide rod (6) far from the valve core (806). A working surface (901) is provided on the outer end face of the cross bar part of the push block (9). A roller (10) is installed at the inner end of the L-shaped swing arm (4) and is in contact and cooperation with the working surface (901). The length of the through groove (202) is adapted to the stroke of the push block (9).

2. The flow control valve based on rotational speed adjustment according to claim 1, wherein: The housing (1) includes a left half housing (101) and a right half housing (102) detachably connected by connecting bolts (11).

3. The flow control valve based on rotational speed adjustment according to claim 2, wherein: The relay member (7) includes a flange shaft (701) and a receiving cavity (601) provided at the corresponding end of the slide rod (6). One end of the flange shaft (701) extending into the receiving cavity (601) is in rolling contact and cooperation with steel balls (702) installed in the receiving cavity (601). The other end of the flange shaft (701) is connected to the valve core (806).

4. The flow control valve based on rotational speed adjustment according to claim 3, characterized in that: The bottom of the receiving cavity (601) is a conical bottom. The steel balls (702) are evenly distributed on the conical bottom and surround the outer circumference of the shaft part of the end of the flange shaft (701) extending into the receiving cavity (601) and cooperate with its flange end face.

5. The regulating valve for adjusting flow based on rotational speed according to claim 4, wherein: The regulating valve (8) includes a valve body (802) connected to the right half housing (102), a liquid inlet (803) and a liquid outlet (805) coaxially arranged on the side wall of the valve body, a valve cover (801) screwed on the outer end of the valve body (802), the valve core (806) is slidably arranged in the valve body (802), the valve core (806) further includes a sealing section (8061) and a push rod section (8063) respectively integrally connected to both ends of the conical section (8062), the sealing section (8061) is slidably fitted in the valve body (802) for disconnecting the liquid inlet (803) and the liquid outlet (805), the push rod section (8063) extends out of the valve body (802) and the front end is fixedly connected to the flange shaft (701), and a spring (804) is arranged between the sealing section (8061) and the valve cover (801).

6. A flow control valve based on rotational speed adjustment of flow rate according to any one of claims 1-5, characterized in that: Two of the weights (5) are symmetrically installed at the outer end of each of the L-shaped swing arms (4). The weights (5) are bullet-shaped, and the center line connecting the two weights (5) is tangent to the rotation direction of the main shaft (2). The small ends of the weights (5) are all arranged outward.

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