A water supply pressure reducing valve capable of adjusting downstream pressure

Abstract

The utility model belongs to valve technical field, specifically provide a kind of water supply pressure reducing valve capable of adjusting downstream pressure, including upper valve body and lower valve body, lower valve body is equipped with water inlet cavity and water outlet cavity, water inlet cavity and water outlet cavity are equipped with valve seat hole between, valve clack is arranged in water inlet cavity and is adapted with valve seat hole, valve clack is connected with valve rod, valve rod is connected with diaphragm pressing plate after passing through valve seat hole, diaphragm pressing plate is used to install elastic diaphragm, diaphragm pressing plate upper side is equipped with lower spring seat, spring is equipped between upper spring seat and lower spring seat, the upper spring seat includes first upper spring seat and second upper spring seat, pressure sensor is equipped between first upper spring seat and second upper spring seat, upper valve body is equipped with up-down drive mechanism that upper spring seat is pressed tightly and can be adjusted to spring up and down, and this pressure reducing valve realizes downstream pressure regulation by adjusting spring elastic force.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a water supply pressure reducing valve capable of regulating downstream pressure. Background Technology

[0002] In existing technologies, water pressure reducing valves regulate downstream pressure under the action of spring force. They are widely used in water pressure reducing systems in hydropower stations. Traditional pressure reducing valves require manual adjustment based on the pressure gauge of the water supply pipeline, resulting in low levels of intelligence. In addition, when the spring undergoes linear deformation in complex environments, the downstream water supply pressure cannot be guaranteed.

[0003] CN120684554A discloses a pressure reducing valve assembly and a marine valve, including a pressure reducing valve and a regulating component for controlling the pressure of the pressure reducing valve. The pressure reducing valve includes a valve seat and a valve cover. A valve stem for controlling the opening and closing of the valve is installed on the valve cover. An regulating cavity for controlling the lifting height of the valve stem is provided inside the valve cover. The two ends of the pressure reducing valve are respectively connected to an inlet end and a drain end. The side of the pressure reducing valve connected to the inlet end is designated as the high-pressure end, and the side connected to the drain end is designated as the low-pressure end. An inner seat is provided inside the valve seat, which divides the inner cavity of the valve seat into a high-pressure inner cavity and a low-pressure inner cavity. A valve hole is provided on the inner seat. The high-pressure inner cavity is connected to the inlet end, and the low-pressure inner cavity is connected to the drain end. A valve stem is elastically installed on the valve cover, and a valve core that seals with the valve hole is provided at the lower end of the valve stem. A circular tray is provided between the valve cover and the valve seat, and a rubber diaphragm is fixedly installed on the tray. The gap between the rubber diaphragm and the valve cover is configured as an adjustment cavity. The middle section of the valve stem is fixed to the rubber diaphragm, the valve core is fixed to one end of the valve stem, and the other end of the valve stem extends into the adjustment cavity. A first spring is pressed between the upper end of the valve stem and the inner wall of the adjustment cavity. This device has a complex structure and requires additional pneumatic adjustment to achieve pressure regulation of the pressure reducing valve. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a water supply pressure reducing valve that can regulate downstream pressure by adjusting the spring force.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a water supply pressure reducing valve capable of adjusting downstream pressure, including an upper valve body and a lower valve body. The lower valve body is provided with an inlet chamber and an outlet chamber, and a valve seat hole is provided between the inlet chamber and the outlet chamber. A valve disc is set in the inlet chamber and adapted to the valve seat hole. The valve disc is connected to a valve stem. The valve stem passes through the valve seat hole and is connected to a diaphragm pressure plate. The diaphragm pressure plate is used to install an elastic diaphragm. A lower spring seat is provided on the upper side of the diaphragm pressure plate. A spring is provided between the upper spring seat and the lower spring seat. The upper spring seat includes a first upper spring seat and a second upper spring seat. A pressure sensor is provided between the first upper spring seat and the second upper spring seat. The upper valve body is provided with an up-and-down driving mechanism that presses the upper spring seat and can adjust the spring up and down.

[0006] In a preferred embodiment, the pressure sensor is a thin-film pressure sensor.

[0007] In a preferred embodiment, the upper and lower driving mechanism includes a screw rotatably mounted on the upper valve body, a threaded hole on the driving block that mates with the screw, a limiting rod inside the upper valve body, a through hole on the driving block that slides along the limiting rod, and a force-applying device at the bottom of the driving block that presses against the upper side of the upper spring seat.

[0008] In a preferred embodiment, a drive motor is provided on the upper side of the upper valve body, and the drive motor is used to drive the screw to rotate.

[0009] In a preferred embodiment, the screw is rotatably mounted on the upper valve body via a bearing.

[0010] In a preferred embodiment, the force-applying device comprises several force-applying rods.

[0011] In a preferred embodiment, the force-applying device is a force-applying ring.

[0012] In a preferred embodiment, the pressure sensor is electrically connected to the controller, which is used to control the start and stop of the drive motor.

[0013] In a preferred embodiment, a connecting nut is provided in the upper valve body corresponding to the limiting rod, and an external thread is provided on the outer side of the upper end of the limiting rod to cooperate with the connecting nut.

[0014] In a preferred embodiment, both the lower and upper spring seats are provided with through holes for the valve stem to pass through. The screw is a hollow screw, with the top of the valve stem located inside the hollow cavity of the screw, and the spring sleeve is fitted on the outside of the valve stem.

[0015] The water supply pressure reducing valve provided by this utility model, which can regulate downstream pressure, has the following beneficial effects: 1. By setting up a thin-film pressure sensor, the actual spring force can be directly measured. Then, based on the balance relationship between the downstream pressure P × diaphragm area S and the spring force F, the downstream pressure can be adjusted by adjusting the spring force.

[0016] 2. When the motor drives the screw to rotate, the limit rod restricts the drive block to move only up and down along the axial direction. The force application device evenly transmits pressure to the upper spring seat, realizing precise control of the spring compression. Compared with the traditional manual adjustment of the parts, there is no need to repeatedly check the pressure gauge on site for adjustment.

[0017] 3. The pressure signal monitored by the pressure sensor is input to the controller, which then controls the drive motor. Based on a preset spring force threshold corresponding to the downstream target pressure, the pressure sensor feeds back the measured spring force to the controller in real time. When the F value deviates from the target threshold (e.g., F is too small, resulting in low downstream pressure), the controller automatically starts the drive motor, rotating the screw to compress the drive block, increasing the spring compression to raise the F value until F matches the target value, satisfying P×S=F, and the downstream pressure reaches the preset value. The entire process requires no manual intervention and automatically maintains stable downstream pressure. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; In the diagram: Upper valve body 1, lower valve body 2, inlet chamber 201, outlet chamber 202, valve seat hole 203, valve disc 3, valve stem 4, diaphragm pressure plate 5, elastic diaphragm 6, lower spring seat 7, upper spring seat 8, first upper spring seat 801, second upper spring seat 802, upper and lower drive mechanism 9, screw 901, drive block 902, limit rod 903, force application device 904, drive motor 905, pressure sensor 10, spring 11, controller 12, connecting nut 13. Detailed Implementation

[0019] like Figures 1-2 As shown, a water supply pressure reducing valve capable of regulating downstream pressure includes an upper valve body 1 and a lower valve body 2. The lower valve body 2 has an inlet chamber 201 and an outlet chamber 202. A valve seat hole 203 is provided between the inlet chamber 201 and the outlet chamber 202, and the inlet chamber 201 and the outlet chamber 202 are connected through the valve seat hole 203. A valve disc 3 is disposed in the inlet chamber 201 and adapted to the valve seat hole 203 for sealing the valve seat hole 203. The valve disc 3 is connected to a valve stem 4. The valve stem 4 passes through the valve seat hole 203 and is connected to a diaphragm pressure plate 5. The diaphragm pressure plate 5 is used to install an elastic diaphragm 6. A lower spring seat 7 is provided on the upper side of the diaphragm pressure plate 5. A spring 11 is provided between the upper spring seat 8 and the lower spring seat 7. The upper spring seat 8 includes a first upper spring seat 801 and a second upper spring seat 802. A pressure sensor 10 is provided between the first upper spring seat 801 and the second upper spring seat 802. In this embodiment, the pressure sensor 10 is a thin-film pressure sensor.

[0020] The upper valve body 1 is provided with a vertical drive mechanism 9 that presses against the upper spring seat 8 and can adjust the spring 11 up and down. For example, the vertical drive mechanism 9 can be a screw, and the upper valve body 1 is provided with a threaded hole that mates with the screw. By rotating the screw, the spring 11 is pressed down, thereby adjusting the spring force.

[0021] In this embodiment, preferably, the up-and-down driving mechanism 9 includes a screw 901 rotatably mounted on the upper valve body 1. Specifically, the screw 901 is rotatably mounted on the upper valve body 1 via a bearing. The driving block 902 is provided with a threaded hole that mates with the screw 901. A limiting rod 903 is provided inside the upper valve body 1. The limiting rod 903 is arranged parallel to the screw 901. The driving block 902 is provided with a through hole that slides along the limiting rod 903, allowing the driving block 902 to move up and down along the limiting rod 903. A force-applying device 904 is provided at the bottom of the driving block 902, and the force-applying device 904 presses against the upper side of the upper spring seat 8.

[0022] The force application device 904 consists of several force application rods or rings. The force application device 904 uses multiple sets of force application rods or rings to contact the upper spring seat, ensuring that the pressure is evenly transmitted to the spring 11, preventing excessive local force from causing radial displacement of the spring or sensor measurement errors, and further ensuring adjustment stability.

[0023] Preferably, a drive motor 905 is provided on the upper side of the upper valve body 1. The drive motor 905 is used to drive the screw 901 to rotate, replacing the manual operation of the screw 901, and facilitating automatic control.

[0024] Preferably, the pressure sensor 10 is electrically connected to the controller 12, which is used to control the start and stop of the drive motor 905. Specifically, in this embodiment, the controller 12 can be an HMI touchscreen programmable controller.

[0025] Preferably, a connecting nut 13 is provided inside the upper valve body 1 corresponding to the limiting rod 903. The connecting nut 13 is welded and fixed inside the upper valve body 1. The upper outer side of the limiting rod 903 is provided with an external thread that mates with the connecting nut 13. By providing the connecting nut 13, it is convenient to install the limiting rod 903.

[0026] In another embodiment, both the lower spring seat 7 and the upper spring seat 8 are provided with through holes for the valve stem 4 to pass through. The screw 901 is a hollow screw, and the top of the valve stem 4 is located inside the hollow cavity of the screw 901 and is lower than the top height of the screw 901. The spring 11 is fitted onto the outside of the valve stem 4. By extending the valve stem 4, the spring 11 extends and retracts along the valve stem 4, preventing the spring from bending left and right, while not affecting the vertical movement of the valve stem 4.

[0027] The working process of the pressure valve provided by this invention is as follows: During operation, water enters from the inlet chamber 201 and flows through the valve seat hole 203 into the outlet chamber 202. When the water pressure in the outlet chamber 202 exceeds the set pressure value, the elastic diaphragm 6 deforms upward, causing the diaphragm pressure plate 5 and valve stem 4 to move upward. This moves the valve disc 3 upward, blocking or partially blocking the valve seat hole 203, thereby reducing the water flow into the outlet chamber 202. The pressure in the outlet chamber 202 decreases, and once the set pressure is reached, the valve disc 3 remains stationary, achieving pressure reduction. The working principle is as follows: when the diaphragm chamber pressure P×S≤F, the pressure reducing valve is fully open; when the diaphragm chamber pressure P×S is greater than F, the pressure reducing valve begins to operate, and the downstream pressure begins to decrease until P×S=F, at which point equilibrium is reached. Here, P is the downstream pressure, F is the spring force measured by the pressure sensor 10, and S is the area of ​​the diaphragm chamber. The downstream pressure can be adjusted by adjusting the spring force F.

[0028] When it is necessary to adjust the pressure of the water outlet chamber 202, this is achieved by adjusting the spring force of the spring 11. Specifically, the drive motor 905 is started, which drives the screw 901 to rotate. Due to the limiting rod 903, the drive block 902 moves up and down, thereby reducing or increasing the pressure on the spring 11 and adjusting the spring force.

[0029] Pressure sensor 10 is electrically connected to controller 12, which in turn controls drive motor 905. By presetting a spring force threshold corresponding to the downstream target pressure, pressure sensor 10 feeds back the measured spring force to controller 12 in real time. When the value of spring force (F) deviates from the target threshold (e.g., F is too small, resulting in low downstream pressure), controller 12 automatically starts drive motor 905, causing screw 901 to rotate and drive block 902 to press down, increasing the compression of spring 11 to raise the value of spring force (F) until F matches the target value, satisfying P×S=F, and the downstream pressure reaches the preset value. The entire process requires no manual intervention and automatically maintains stable downstream pressure.

[0030] In practical use, the controller 12 can communicate with a computer, enabling both local operation and remote computer operation.

[0031] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The embodiments and features described in this application can be arbitrarily combined without conflict. The protection scope of this utility model should be defined as the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A water supply pressure reducing valve capable of regulating downstream pressure, comprising an upper valve body (1) and a lower valve body (2), the lower valve body (2) having an inlet chamber (201) and an outlet chamber (202), a valve seat hole (203) being provided between the inlet chamber (201) and the outlet chamber (202), a valve disc (3) being disposed in the inlet chamber (201) and adapted to the valve seat hole (203), the valve disc (3) being connected to a valve stem (4), the valve stem (4) passing through the valve seat hole (203) and being connected to a diaphragm pressure plate (5), the diaphragm pressure plate (5) being used to install an elastic diaphragm (6), a lower spring seat (7) being provided on the upper side of the diaphragm pressure plate (5), and a spring (11) being provided between the upper spring seat (8) and the lower spring seat (7), characterized in that, The upper spring seat (8) includes a first upper spring seat (801) and a second upper spring seat (802). A pressure sensor (10) is provided between the first upper spring seat (801) and the second upper spring seat (802). The upper valve body (1) is provided with an up-down drive mechanism (9) that presses the upper spring seat (8) and can adjust the spring (11) up and down.

2. A water supply pressure reducing valve capable of adjusting downstream pressure according to claim 1, characterized in that, The pressure sensor (10) is a thin-film pressure sensor.

3. A water supply pressure reducing valve capable of adjusting downstream pressure according to claim 1, characterized in that, The upper and lower drive mechanism (9) includes a screw (901) rotatably mounted on the upper valve body (1), a threaded hole that mates with the screw (901) on the drive block (902), a limit rod (903) inside the upper valve body (1), a through hole that slides along the limit rod (903) on the drive block (902), and a force application device (904) at the bottom of the drive block (902), which presses against the upper side of the upper spring seat (8).

4. A water supply pressure reducing valve capable of adjusting downstream pressure according to claim 3, characterized in that, The upper valve body (1) is provided with a drive motor (905) on the upper side, and the drive motor (905) is used to drive the screw (901) to rotate.

5. A water supply pressure reducing valve capable of adjusting downstream pressure according to claim 3, characterized in that, The screw (901) is rotatably mounted on the upper valve body (1) via a bearing.

6. A water supply pressure reducing valve capable of adjusting downstream pressure according to claim 3, characterized in that, The force-applying device (904) consists of several force-applying rods.

7. A water supply pressure reducing valve capable of adjusting downstream pressure according to claim 3, characterized in that, The force-applying device (904) is a force-applying ring.

8. A water supply pressure reducing valve capable of adjusting downstream pressure according to claim 4, characterized in that, The pressure sensor (10) is electrically connected to the controller (12), which is used to control the start and stop of the drive motor (905).

9. A water supply pressure reducing valve capable of adjusting downstream pressure according to claim 3, characterized in that, The upper valve body (1) is provided with a connecting nut (13) corresponding to the limiting rod (903), and the upper outer side of the limiting rod (903) is provided with an external thread that mates with the connecting nut (13).

10. A water supply pressure reducing valve capable of adjusting downstream pressure according to claim 3, characterized in that, Both the lower spring seat (7) and the upper spring seat (8) are provided with through holes for the valve stem (4) to pass through. The screw (901) is a hollow screw. The top of the valve stem (4) is set in the hollow cavity of the screw (901). The spring (11) is fitted on the outside of the valve stem (4).

Images