Multi-stage pressure and temperature reduction water valve

Abstract

The utility model discloses a multi-stage pressure and temperature reduction water valve, and belongs to the technical field of fluid control. The multi-stage pressure and temperature reduction water valve comprises a valve hole, a valve cavity and a valve plate, the valve hole is divided into a front flow channel and a rear flow channel by the valve plate and the valve cavity, the valve plate is used for controlling connection and disconnection of the front flow channel and the rear flow channel, the rear valve seat is arranged at the end, close to the valve cavity, of the rear flow channel, and one end of the rear valve seat is in sealed sliding connection with the valve plate; and the multi-stage pressure reduction window is arranged in the rear valve seat and comprises two S-shaped throttling flow channels which are symmetrically arranged, one ends of the S-shaped throttling flow channels communicate with the valve cavity, the other ends of the S-shaped throttling flow channels communicate with the rear flow channel, and the S-shaped throttling flow channels are used for reducing the pressure of fluid flowing into the S-shaped throttling flow channels. According to the multi-stage pressure and temperature reducing water valve, gradient pressure reduction can be carried out on water flow, so that the cavitation effect caused by pressure difference when the water flow penetrates through the valve hole is reduced, damage caused by cavitation to components in the valve body is reduced, and scouring of the water flow to the components in the valve body under the working condition of high pressure difference is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid control technical field, concretely relates to a kind of multistage pressure-reducing temperature-reducing water valves. BACKGROUND

[0002] The pressure-reducing temperature-reducing water valve is a valve with pressure reduction and temperature reduction functions, which is commonly used in heating systems to avoid damage to terminal equipment by high-temperature and high-pressure hot water, and to regulate the pressure and temperature of circulating water to a suitable range in industrial production to ensure normal operation of equipment.

[0003] The existing temperature-reducing pressure-reducing water valve achieves pressure reduction through throttling, i.e., when water flows through the valve, the passage between the valve disc and the valve seat narrows to form throttling, the water flow speed increases, and according to Bernoulli's principle, the increase in fluid speed will cause a decrease in pressure, thereby achieving pressure reduction; the temperature reduction function mainly utilizes the flashing phenomenon of water during pressure reduction. After the pressure of water decreases, the boiling point also decreases, and part of the water will vaporize into water vapor to take away heat, thereby reducing the water temperature.

[0004] However, the existing pressure-reducing temperature-reducing water valve adopts a traditional single-seat valve structure, has poor adjustment performance, and responds not timely, which cannot meet the requirements of 0-5 t / h flow adjustment and maximum flow of 19 t / h. Moreover, the existing valve is prone to flashing, cavitation occurs near the valve core and valve seat, causing damage to the valve internals and internal leakage of the valve. SUMMARY

[0005] The utility model aims to overcome the problems in the prior art and provides a multistage pressure-reducing temperature-reducing water valve, which can reduce the cavitation effect caused by pressure difference when water flows through the valve hole, thereby reducing the damage caused by cavitation to the internal parts of the valve body, and reducing the erosion of water flow to the internal parts of the valve body under high pressure difference conditions.

[0006] The utility model provides a multistage pressure-reducing temperature-reducing water valve, which comprises a valve hole, a valve cavity, and a valve plate, the valve plate, and the valve cavity separate the valve hole into a front flow passage and a rear flow passage, the valve plate is used to control the on-off of the front flow passage and the rear flow passage, and further comprises:

[0007] A rear valve seat is arranged at one end of the rear flow passage close to the valve cavity, and one end of the rear valve seat is in sealing sliding connection with the valve plate.

[0008] A multistage pressure-reducing window is arranged in the rear valve seat, the multistage pressure-reducing window comprises two symmetrically arranged S-shaped throttling flow passages, one end of each S-shaped throttling flow passage is in communication with the valve cavity, the other end of each S-shaped throttling flow passage is in communication with the rear flow passage, and the S-shaped throttling flow passage is used to reduce the pressure of the fluid flowing into it.

[0009] Preferably, the multistage pressure-reducing window further comprises a cross-shaped grid, the rear valve seat is provided with a through hole, and the cross-shaped grid and the inner wall of the through hole form the two S-shaped throttling flow passages.

[0010] Preferably, a straight-through throttling window is further arranged on the rear valve seat, one end of the straight-through throttling window being communicated with the valve cavity, and the other end of the straight-through throttling window being communicated with the rear flow channel.

[0011] Preferably, a front valve seat is arranged in the front flow channel, the front valve seat being arranged at one end of the front flow channel close to the valve cavity, and the valve plate being in sealing sliding connection with the end face of the front valve seat.

[0012] Preferably, a sliding plate block is arranged on the side of the valve plate close to the rear flow channel, and the valve plate is in sealing sliding connection with the end face of the rear valve seat through the sliding plate block.

[0013] Preferably, a valve rod is connected to the valve plate, and the valve rod is used for driving the valve plate to slide in the valve cavity.

[0014] Preferably, a sliding hole is further arranged, the valve rod is in sliding connection with the sliding hole, the bottom end of the sliding hole is communicated with the valve cavity, the top end of the sliding hole is provided with a sealing ring, and the top end of the valve rod is in sealing sliding connection with the sealing ring.

[0015] Preferably, the rear valve seat and the rear flow channel are detachably connected.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows: the multi-stage pressure reduction window in the utility model can reduce the pressure of water flow flowing from the valve cavity to the rear flow channel, thereby performing gradient pressure reduction on the water flow, reducing cavitation caused by pressure difference when the water flow passes through the valve hole, reducing the damage caused by cavitation to the internal components of the water valve, and reducing the erosion of the internal components of the valve body by water flow under high pressure difference. The S-shaped throttling flow channel of the valve can perform gradient pressure reduction on the water flow, thereby reducing cavitation caused by pressure difference when the water flow passes through the valve hole, reducing the damage caused by cavitation to the internal components of the water valve, and reducing the erosion of the internal components of the valve body by water flow under high pressure difference.

[0017] The flow direction of the water flow in the valve is perpendicular to the valve plate, the fluid presses the valve plate on the rear valve seat, the actuator only overcomes the friction between the valve plate and the rear valve seat, and the sliding plate block completely eliminates the oscillation of the entire valve, especially in high pressure difference occasions and steam pipe network occasions. The mirror surface contact between the two plates has a very small friction coefficient, and the valve plate can very sensitively track the change of the actuator signal, and the adjustment quality is very high. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a structural schematic view of the utility model.

[0019] Mark explanation:

[0020] 101. Valve body, 102. Valve plate, 103. Valve stem, 104. Valve hole, 105. Valve cavity, 106. Front flow channel, 107. Rear flow channel, 108. Rear valve seat, 109. Multi-stage pressure reduction window, 2. S-shaped throttling flow channel, 3. Straight-through throttling window, 4. Front valve seat, 5. Slide block, 601. Sliding hole, 602. Sealing ring. Detailed Implementation

[0021] The following is in conjunction with the appendix Figure 1 The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the protection scope of this utility model.

[0022] like Figure 1 As shown, this utility model provides a multi-stage pressure-reducing and heat-reducing water valve, including a valve hole 104, a valve cavity 105, and a valve plate 102. The valve plate 102 and the valve hole 104 are disposed within the valve body 101 of the water valve. The valve cavity 105 divides the valve hole 104 into a front flow channel 106 and a rear flow channel 107. The valve plate 102 is used to control the opening and closing of the front flow channel 106 and the rear flow channel 107. It also includes a rear valve seat 108 and a multi-stage pressure-reducing window 109. The rear valve seat 108 is disposed within... The rear flow channel 107 is located near one end of the valve cavity 105. One end of the rear valve seat 108 is slidably connected to the valve plate 102. A multi-stage pressure reduction window 109 is located inside the rear valve seat 108. The multi-stage pressure reduction window 109 includes two symmetrically arranged S-shaped throttling channels 2. One end of the S-shaped throttling channel 2 is connected to the valve cavity 105, and the other end of the S-shaped throttling channel 2 is connected to the rear flow channel 107. The S-shaped throttling channel 2 is used to reduce the pressure of the fluid flowing into it.

[0023] The working principle of the above embodiments is briefly described below:

[0024] The temperature reducing valve is used, and normally, water flows from the front flow channel 106 to the valve cavity 105 and the two S-shaped throttling flow channels 2 of the multi-stage pressure reducing window 109, and then enters the rear flow channel 107, and then flows out of the valve body 101 of the whole water valve through the rear flow channel 107. The two S-shaped throttling flow channels 2 of the multi-stage pressure reducing window 109 can reduce the pressure of the water flow from the valve cavity 105 to the rear flow channel 107, thereby performing cascade pressure reduction on the water flow, so that the cavitation effect caused by the pressure difference when the water flow passes through the valve hole 104 is reduced, thereby reducing the damage caused by cavitation to the internal parts of the valve body 101, and reducing the erosion of the water flow to the internal parts of the valve body 101 under high pressure difference conditions. When the temperature reducing valve is closed, the valve plate 102 is driven to slide in the valve cavity 105 by the valve rod 103, so that the valve plate 102 blocks the front flow channel 106 and the rear flow channel 107, thereby achieving the effect of closing the valve hole 104. The multi-stage pressure reducing-straight-through segmented type flow regulating sliding plate valve structure disperses the working pressure difference load to the multi-stage pressure reducing window 109. On the one hand, the load force of each window of the multi-stage pressure reducing window 109 is reduced, and on the other hand, the medium flow rate is also reduced, thereby reducing the medium erosion damage energy. The valve plate 102 and the rear valve seat 108 are processed by grinding, counter-grinding and the like, the sealing surface can reach the mirror surface level, the surface roughness is controlled to be below 0.25um, the ANSI B16.104 V level and above leakage levels can be easily realized, the same flow is opened, the rear valve seat 108 is fixed, the valve plate 102 moves up and down to adjust, the valve hole 104 is completely staggered to be fully closed, and the valve hole 104 is completely coincided to be fully opened.

[0025] The multi-stage pressure reducing temperature reducing water valve can perform cascade pressure reduction on the water flow, so that the cavitation effect caused by the pressure difference when the water flow passes through the valve hole 104 is reduced, thereby reducing the damage caused by cavitation to the internal parts of the valve body 101 of the water valve, and reducing the erosion of the water flow to the internal parts of the valve body 101 under high pressure difference conditions.

[0026] On the basis of the above embodiment, in order to further reduce the damage caused by cavitation to the internal parts of the valve body 101 of the water valve.

[0027] As shown in Figure 1 The multi-stage pressure reducing window 109 further comprises a cross-shaped grid, and the rear valve seat 108 is provided with a through hole, and the two S-shaped throttling flow channels 2 are formed by the cross-shaped grid and the inner wall of the through hole.

[0028] By arranging the cross-shaped grid, the impact force of the water flow on the cross-shaped grid is further reduced, thereby further reducing the pressure of the water flow, thereby further reducing the damage caused by cavitation to the internal parts of the valve body 101 of the water valve.

[0029] As a preferred scheme, as shown in Figure 1As shown in the figure, the rear valve seat 108 is further provided with a straight-through throttling window 3, one end of which is communicated with the valve cavity 105, and the other end of which is communicated with the rear flow channel 107. By arranging the straight-through throttling window 3 above the S-shaped throttling flow channel 2, the fluid can be confined in the flow channel, and the influence of the fluid state on the strength of the valve body 101 is minimized, so that the safety of the valve can be guaranteed to the maximum extent; at the same time, due to the clamping of the double valve seats, the stability of the valve plate 102 is better, and the oscillation is eliminated, and the adjustment quality is good.

[0030] As a preferred solution, as shown in the figure, Figure 1 As shown in the figure, the front flow channel 106 is provided with a front valve seat 4, the front valve seat 4 is arranged at one end of the front flow channel 106 close to the valve cavity 105, and the valve plate 102 is in sealing sliding connection with the end face of the front valve seat 4. The front valve seat 4 and the rear valve seat 108 clamp the valve plate 102 in two directions, so that the stability of the valve plate 102 is better, and the oscillation of the valve plate 102 is completely eliminated, so that the adjustment quality of the temperature reducing valve is optimal.

[0031] As a preferred solution, as shown in the figure, Figure 1 As shown in the figure, the valve plate 102 is provided with a sliding plate block 5 on the side close to the rear flow channel 107, and the valve plate 102 is in sealing sliding connection with the end face of the rear valve seat 108 through the sliding plate block 5. The two valve plates 102 of the sliding plate regulating valve sliding in mirror surface are wide in sealing surface, have sufficient flushing and wear allowance, and the sealing surface is perpendicular to the flow direction of the medium, so that the flushing and wear of the inner part are reduced. The flow direction is perpendicular to the valve plate 102, the fluid presses the valve plate 102 on the rear valve seat 108, and the actuator only overcomes the friction between them, and the sliding plate block 5 completely eliminates the oscillation of the entire valve, especially in high differential pressure occasions and steam pipe network occasions. The mirror surface contact between the two plates has a small friction coefficient, and the valve plate 102 can very sensitively track the change of the actuator signal, and the adjustment quality is very high.

[0032] As a preferred solution, as shown in the figure, Figure 1 As shown in the figure, the valve plate is connected with a valve rod 103, and the valve rod 103 is used to drive the valve plate 102 to slide in the valve cavity 105. By arranging the valve rod 103, the valve plate 102 is driven to move by the valve rod 103, so as to control the action of the entire valve, so as to realize accurate control of the opening of the entire valve.

[0033] As a preferred solution, as shown in the figure, Figure 1As shown in the figure, the valve body 101 is provided with a sliding hole 601, the valve rod 103 is in sliding connection with the sliding hole 601, the bottom end of the sliding hole 601 is in communication with the valve cavity 105, the top end of the sliding hole 601 is provided with a sealing ring 602, and the top end of the valve rod 103 is in sealing sliding connection with the sealing ring 602. When the valve is controlled to act, the valve rod 103 is driven to move in the sliding hole 601, the valve rod 103 drives the valve plate 102 at the bottom to move, and in this process, the sealing ring 602 is closely attached to the sliding hole 601 and the outer wall of the valve rod 103, which can improve the sealing performance of the whole valve, thereby improving the reliability of the whole valve.

[0034] As a preferred solution, as shown in the figure, Figure 1 As shown in the figure, the rear valve seat 108 is in detachable connection with the rear flow channel 107. By setting the rear valve seat 108 in detachable connection, the convenience of disassembling the rear valve seat 108 can be improved, thereby improving the maintenance convenience of the whole valve.

[0035] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-stage pressure-reducing and temperature-reducing water valve comprising a valve hole (104), a valve chamber (105) and a valve plate (102), the valve chamber (105) separating the valve hole (104) into a front flow passage (106) and a rear flow passage (107), the valve plate (102) being used to control the opening and closing of the front flow passage (106) and the rear flow passage (107), characterized in that, Also include: The rear valve seat (108) is arranged in the rear flow channel (107) near one end of the valve cavity (105), and one end of the rear valve seat (108) is in sealing sliding connection with the valve plate (102); The multi-stage pressure reduction window (109) is arranged in the rear valve seat (108), and the multi-stage pressure reduction window (109) includes two symmetrically arranged S-shaped throttling flow channels (2), one end of the S-shaped throttling flow channel (2) is in communication with the valve cavity (105), and the other end of the S-shaped throttling flow channel (2) is in communication with the rear flow channel (107), and the S-shaped throttling flow channel (2) is used for reducing the pressure of the fluid flowing into it.

2. The multiple stage pressure reducing and temperature reducing water valve according to claim 1, wherein The multi-stage pressure reduction window (109) further includes a cross-shaped grid, and the rear valve seat (108) is provided with a through hole, and the cross-shaped grid and the inner wall of the through hole form the two S-shaped throttling flow channels (2).

3. The multiple stage pressure reducing and temperature reducing water valve according to claim 1, wherein The rear valve seat (108) is further provided with a straight-through throttling window (3), one end of the straight-through throttling window (3) is in communication with the valve cavity (105), and the other end of the straight-through throttling window (3) is in communication with the rear flow channel (107).

4. The multiple stage pressure reducing and temperature reducing water valve as set forth in claim 1, wherein The front flow channel (106) is provided with a front valve seat (4), and the front valve seat (4) is arranged in the front flow channel (106) near one end of the valve cavity (105), and the valve plate (102) and the front valve seat (4) are in sealing sliding connection with the end face.

5. The multiple stage pressure reducing and temperature reducing water valve as set forth in claim 1, wherein The valve plate (102) is provided with a sliding plate block (5) near one side of the rear flow channel (107), and the valve plate (102) is in sealing sliding connection with the end face of the rear valve seat (108) through the sliding plate block (5).

6. The multiple stage pressure reducing and temperature reducing water valve as set forth in claim 1, wherein The valve plate is connected with a valve rod (103), and the valve rod (103) is used for driving the valve plate (102) to slide in the valve cavity (105).

7. The multiple stage pressure reducing temperature reducing water valve of claim 6 wherein, Further comprising a sliding hole (601), the valve rod (103) is in sliding connection with the sliding hole (601), the bottom end of the sliding hole (601) is in communication with the valve cavity (105), and the top end of the sliding hole (601) is provided with a sealing ring (602), and the top end of the valve rod (103) is in sealing sliding connection with the sealing ring (602).

8. The multiple stage pressure reducing and temperature reducing water valve as recited in claim 1, wherein The rear valve seat (108) and the rear flow channel (107) are detachably connected.

Images