CN210003587U - A throttle valve with a built-in decompression and drainage device - Google Patents

Abstract

The utility model discloses a throttle valve with a built-in decompression and drainage device, which is characterized by comprising a left end cover, a guide sleeve, a throttling valve core, a valve body, a decompression valve sleeve, a drainage device, a decompression spring, a right end cover, etc. . The water inlet and outlet are located on the valve body and the right end cover respectively, and a guide sleeve is installed between the throttle valve core and the valve body; the pressure reducing valve sleeve is built into the valve body hole, and the drainage device is built into the pressure reducing valve sleeve inner hole. It can slide left and right; a decompression spring is installed between the drainage device and the right end cover to adjust the displacement of the drainage device; there are two sets of waist-shaped holes with different diameters on the left side of the pressure reducing valve sleeve, and there are steps inside the drainage device. There is a step at the end, and the two constitute the pressure reducing valve port. The throttle valve shown in the utility model can lead the water at the outlet to the throttle valve port, and no matter how high the water outlet pressure is, the pressure at the throttle valve port is basically constant, so that the cavitation under the pressure of each working condition is basically constant. The inhibition effect is basically the same, and it can adapt to various pressure applications.

Description

A throttle valve with a built-in decompression and drainage device

technical field

The utility model belongs to the field of water hydraulic pressure, in particular to a throttle valve with a built-in pressure reducing and drainage device.

Background technique

Water hydraulic technology is a hydraulic transmission technology that uses seawater or fresh water as the working medium for energy transmission and control. It has the advantages of no pollution, environmental friendliness, safety and energy saving. It is a typical "green production technology". Hydraulic throttle valve is a kind of flow control valve commonly used in water hydraulic system, which is used for loading and throttling speed regulation. However, because the saturated vapor pressure of water is much higher than that of oil, the hydraulic throttle valve is prone to cavitation in the high-speed flow area such as the valve port, resulting in a large number of air bubbles, destroying the continuity of the water flow and causing flow When the bubble enters the high pressure area of the valve outlet, it will cause local pressure shock, vibration and noise. When the bubble bursts, local high temperature and high pressure will be generated, causing corrosion to the metal.

The pressure distribution at the valve port is an important factor affecting the cavitation phenomenon of the throttle valve. Improving the pressure distribution at the valve port is a commonly used measure to suppress cavitation, including the structure design of the valve port and the throttle valve valve caused by the inlet pressure. mouth. However, after the load increases, the high pressure is induced to the throttle valve port, causing a large pressure shock and even unable to suppress the cavitation phenomenon.

Utility model content

Aiming at the cavitation phenomenon in the hydraulic throttle valve, the utility model provides a throttle valve with a built-in decompression and drainage device, so as to effectively suppress the cavitation phenomenon under different working conditions.

A throttling valve with a built-in decompression and drainage device, comprising a valve body, a lock nut, a hexagon socket head cap screw, a spring washer, a left end cover, a spring retaining ring for a shaft, an O-ring, a guide sleeve, a throttling valve core, and a pressure reducing valve sleeve, drainage device, decompression spring, right end cap. The throttle valve of the built-in decompression and drainage device is divided into left and right sections, the left section is the throttle valve section, and the right section is the drainage section. In the throttle valve section, the left end cover is connected to the valve body with internal flow angle screws, and is axially sealed by the O-ring; the throttle valve core and the left end cover are connected by threads, and the locking nut is used for positioning and locking; The part of the throttle valve core entering the valve body is equipped with a guide sleeve, and the two sides of the guide sleeve are respectively positioned with a shaft elastic retaining ring and a boss; the valve body is provided with a water inlet. In the drainage section, the pressure reducing valve sleeve is built into the valve hole of the valve body, the left and right sides are positioned axially through the boss and the right end cover, and the right end cover and the valve body are connected by socket head cap screws; the drainage device is built into the pressure reducing valve The inner hole is sleeved and can be slid left and right; there are bosses on the right side of the drainage device and the left side of the right end cover to install the decompression spring and adjust the displacement of the drainage device; the right end cover has a water outlet.

Further, the right side of the throttle valve core is a conical valve core, which forms a conical valve port with the valve body, and the valve port of the valve body adopts an obtuse chamfer.

Further, the left side of the pressure reducing valve sleeve is provided with inner and outer diameter waist-shaped holes, and the sum of the angles of the waist-shaped holes at each diameter is (270°˜360°).

Further, the drainage device is provided with a plurality of radial circular holes, which are symmetrically distributed along the radial direction.

Furthermore, there are steps inside the drainage device, the end of the pressure reducing valve sleeve has steps, and the diameter of the step is smaller than the diameter of the step, and the two constitute the pressure reducing valve port.

Further, the contact length of the drainage device and the pressure reducing valve sleeve is 1/5-1/2 of the length of the drainage device.

Compared with the prior art, the beneficial effects of the present utility model are:

(1) The utility model leads the outlet pressure water to the valve port of the throttle valve to improve the pressure distribution of the valve port, thereby effectively suppressing the cavitation phenomenon of the water pressure valve port; when the back pressure of the throttle valve outlet changes, the pressure reducing device The drainage pressure at the throttle valve port is basically kept unchanged, and the cavitation suppression effect can be basically kept constant, so that the cavitation phenomenon under different working conditions can be effectively suppressed, and it is suitable for various working pressure occasions.

(2) The decompression and drainage device of the present invention is built-in and integrated in the throttle valve, has a compact structure, and is suitable for cavitation suppression of various hydraulic control valves.

Description of drawings

Fig. 1 is the structural representation of the present utility model;

2 is a schematic diagram of a throttle valve during decompression;

Fig. 3 is the schematic diagram of the throttle valve when it is locked;

Figure 4 is a schematic diagram of the structure of the pressure reducing valve sleeve;

FIG. 5 is a schematic diagram of the structure of the drainage device.

The symbols in the above figure are: lock nut 1, hexagon socket head cap screw 2, spring washer 3, left end cover 4, shaft retaining ring 5, O-ring 6, guide sleeve 7, throttle valve core 8, valve body 9, Pressure reducing valve cover 10, drainage device 11, pressure reducing spring 12, right end cover 13, water inlet 14, throttle valve port 15, pressure reducing valve cover drainage port 16, pressure raising port 17, pressure reducing valve port 18, drainage device Drainage port 19, water outlet 20, step 21, drainage waist-shaped hole 22, pressure lifting waist-shaped hole 23, shoulder 24

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

Fig. 1 is an embodiment of the present utility model, including a locking nut 1, a hexagon socket head cap screw 2, a spring washer 3, a left end cover 4, a shaft elastic retaining ring 5, an O-ring 6, a guide sleeve 7, a throttle valve Core 8 , valve body 9 , pressure reducing valve sleeve 10 , drainage device 11 , pressure reducing spring 12 and right end cover 13 . The throttle valve of the built-in decompression and drainage device is divided into left and right sections. The left side of the throttle valve port 15 plays the role of throttling and speed regulation, which is called the throttle valve section, and the right side of the throttle valve port 15 plays the role of decompression and drainage. , called the drainage section. In the throttle valve section, the left end cover 4 is connected to the valve body 9 by the socket head cap screw 2 and the spring washer 3, and is axially sealed by the O-ring 6; the throttle valve core 8 and the left end cover 4 are connected by threads, The locking nut 1 is used for positioning and locking; a guide sleeve 7 is installed between the throttle valve core 8 and the valve body 9, and the two sides of the guide sleeve 7 are positioned by the shaft elastic retaining ring 5 and the shaft shoulder; A water inlet 14 is opened. In the drainage section, the pressure reducing valve sleeve 10 is built into the valve hole of the valve body 9, and the left and right sides are axially positioned by the steps in the valve body 9 and the right end cover 13. The spring washer 3 is connected, and the end face is sealed by the O-ring 6; the drainage device 11 is built in the inner hole of the pressure reducing valve sleeve 10, and the drainage device 11 can slide left and right by using clearance fit; the right side of the drainage device 11 and There are bosses on the left side of the right end cover 13 for installing the decompression spring 12, adjusting the displacement of the drainage device 11, and changing the size of the decompression valve port 18; the right end cover has a water outlet 20.

The right side of the throttle valve core 8 is a conical valve core, which forms a conical throttle valve port 15 with the valve body. The valve port at the valve body 9 adopts an obtuse chamfer, so that the high-pressure water in the water outlet 20 is easier to guide. Throttle valve port 15. The left side of the pressure reducing valve sleeve 10 is provided with two sets of waist-shaped holes with different diameters, namely the drainage waist-shaped hole 22 and the pressure lifting waist-shaped hole 23, forming the drainage valve sleeve drainage port 16 and the pressure lifting port 17. The drainage device 11 is provided with a plurality of radially symmetrical drainage device drainage ports 19; the end of the drainage device 11 has a step 24, the end of the pressure reducing valve sleeve 10 has a step 21, the diameter of the step 24 is smaller than the diameter of the step 21, and a gap is used. In cooperation, the two constitute the pressure reducing valve port 18 . The contact length between the drainage device 11 and the pressure reducing valve sleeve 10 is 1/5-1/2 of the total length of the drainage device 11 to avoid the overturning phenomenon of the pressure reducing valve port 18 .

The water flows in from the water inlet 14, and then flows to the water outlet 20 through the throttle valve port 15. This process is the working process of a conventional throttle valve. When cavitation occurs, the pressure of the throttle valve port 15 drops below atmospheric pressure. For the throttle valve with the built-in decompression and drainage device shown in FIG. 1, the water at the water outlet 20 passes through the drainage device drainage port 19, and then flows through the reducing device. The pressure valve port 18 and the pressure reducing valve sleeve drainage port 16 finally reach the throttle valve port 15, thereby improving the valve port pressure distribution and suppressing the cavitation phenomenon of the hydraulic valve port.

The following analysis is divided into two situations of lower pressure and higher pressure at the water outlet 20 . When the water pressure at the water outlet 20 is low, there is basically no decompression effect at the pressure reducing valve port 18, and there is no pressure loss, which is equivalent to the pressure of the water outlet 20 being basically completely introduced into the throttle valve port 15. At this time, the drainage device 11 is pressed on the pressure reducing valve sleeve 10, and the pressure reducing spring 12 is in the initial compressed state, as shown in FIG. 1 . 2 is a schematic diagram of the throttle valve when decompression occurs. When the water pressure at the water outlet 20 is relatively high, the water at the drainage port 16 of the pressure reducing valve sleeve passes through the pressure lifting port 17 and acts on the pressure reducing valve sleeve 10, so that The pressure reducing valve sleeve 10 moves to the right, the pressure reducing spring 12 is further compressed, the flow area of the pressure reducing valve port 18 is reduced, and the pressure reducing effect is played, so that the pressure at the throttle valve port 15 is lower than the pressure at the water outlet 20 , to avoid the pressure shock caused by high-pressure drainage at the water outlet 20; on the other hand, through the force analysis of the pressure reducing valve sleeve 10, it can be seen that the pressure at the pressure rise port 17 is approximately Kx/A (K, x are the pressure reduction, respectively The stiffness and pre-compression amount of the spring 12; A is the cross-sectional area of the pressure raising port 17), which is basically a constant value. It can be seen from this that no matter how high the pressure at the water outlet 20 is, the pressure reducing device keeps the drainage pressure at the throttle valve port 15 basically unchanged, and the cavitation suppression effect can be basically kept constant.

3 is the adjustment of the throttle valve core 8 so that the throttle valve port 15 is closed, and the water in the water inlet 14 cannot pass through the throttle valve port 15. At this time, the drainage device 11 is pressed on the pressure reducing valve sleeve 10, and the pressure reducing spring 12 In the initial compression state, the water in the entire throttle valve is in a static state.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (7)

1. The throttling valve with the built-in pressure-reducing drainage device is characterized by comprising a valve body, a locking nut, a hexagon socket screw, a spring washer, a left end cover, a shaft elastic check ring, an O-shaped ring, a guide sleeve, a throttling valve core, a pressure-reducing valve sleeve, a drainage device, a pressure-reducing spring and a right end cover, wherein the built-in pressure-reducing drainage device is divided into a left section and a right section, the left section is a throttling valve section, the right section is a drainage section, the left end cover is connected to the valve body through the hexagon socket screw and is axially sealed through the O-shaped ring, the throttling valve core is connected with the left end cover through threads and is locked and positioned through the locking nut, the guide sleeve is arranged on the part, entering the valve body, of the throttling valve core is provided with the guide sleeve, two sides of the guide sleeve are respectively positioned through the shaft elastic check ring and a boss, a water inlet is formed in the valve body, the drainage section, the pressure-reducing valve sleeve is arranged in the valve body hole, the left side and the left side of the valve body, the boss and the right end cover are axially positioned through the boss, the right end cover and.
2. 2. The throttle valve with built-in pressure-reducing and flow-guiding device according to claim 1, wherein the right side of the throttle valve core is a conical valve core, which forms a conical valve port with the valve body, and the valve port of the valve body is a blunt chamfer.
3. 3. The throttling valve with built-in pressure-reducing and flow-guiding device according to claim 1, wherein the pressure-reducing valve sleeve is provided with two layers of three-section kidney-shaped holes.
4. 4. The throttle valve with built-in pressure-reducing and flow-guiding device as claimed in claim 1, wherein the flow-guiding device is provided with a radial circular hole.
5. 5. The built-in pressure reducing diversion device throttling valve of claim 1, wherein the pressure reducing spring is axially positioned by the diversion device and a right end cover boss, and the pressure reducing spring is in a compressed state in an initial state.
6. 6. The throttle valve with built-in pressure-reducing and flow-guiding device as claimed in claim 1, wherein the contact length between the flow-guiding device and the pressure-reducing valve sleeve is 1/5-1/2 of the total length of the flow-guiding device.
7. 7. The throttling valve with built-in pressure-reducing and flow-guiding device as claimed in claim 1, wherein the flow-guiding device has a step inside, the end of the pressure-reducing valve sleeve has a step, the diameter of the step is smaller than that of the step, and the step form a pressure-reducing valve port.

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