Normally closed electric two-way valve

Abstract

The utility model provides a normally closed type electric two-way valve, which relates to the technical field of two-way valves and comprises an electric actuator and a valve body, the outer surface of the valve body is fixedly communicated with a valve seat, the inner wall of the valve body is fixedly connected with a fixed cylinder, the bottom end of the fixed cylinder is fixedly connected with the valve body, and the top end of the fixed cylinder is communicated with the valve seat. A sliding sleeve is slidably connected to the inner wall of the fixing cylinder, a top plate is fixedly connected to the inner wall of the sliding sleeve, a valve rod is inserted into the upper surface of the top plate, and a fixing plate is fixedly connected to the bottom end of the valve rod. According to the normally-closed type electric two-way valve, the sliding sleeve is arranged, the first circulation opening and the second circulation opening are formed, and meanwhile the first circulation opening and the second circulation opening are distributed in a staggered mode, so that the mode that common water flow impacts the valve clack during opening and closing is changed into the mode that water flow impacts the sliding sleeve, and therefore the influence of the water hammer effect on the whole during opening and closing is relieved; the problem that in the prior art, after a normally-closed two-way valve is used for a long time, a valve clack is prone to being damaged, and normal use is affected is solved.

Description

Technical Field

[0001] The utility model relates to a normally closed electric two-way valve, in particular to a normally closed electric two-way valve, belonging to the technical field of two-way valves. Background Art

[0002] The two-way valve is one of many pipeline valves, most of which are suitable for the temperature control of the terminal air-conditioning equipment in the HVAC system, such as air-conditioning boxes, fresh air units, air handling units, etc. According to the control form, it is divided into manual two-way valves, electric two-way valves and pneumatic hydraulic two-way valves. Among them, the electric two-way valve is widely used because of its wide range of applicable scenarios and moderate cost. The electric two-way valve can be matched with a temperature sensor, and the temperature sensor controls the operation of the electric actuator, thereby driving the valve stem of the two-way valve to rise and fall, and then driving the valve disc to rise and fall synchronously to seal and contact the opening and closing valve seat, that is, realizing the switching of the two-way valve, and also realizing the on and off of the cold water or hot water in the pipeline, and then supplying air through the fan coil to realize automatic temperature adjustment.

[0003] Common normally closed electric two-way valves usually close by having the valve disc directly contact the water flow and block the water flow. However, when the two-way valve needs to be opened for use, a water hammer effect will be formed in the pipeline due to the sudden opening and closing. Frequent use will cause high-pressure water flow to frequently impact the valve disc, thereby causing damage to the valve disc and affecting the normal use of the two-way valve. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] The purpose of the utility model is to provide a normally closed electric two-way valve in order to solve the above problems, so as to solve the problem that the valve disc of the normally closed two-way valve in the prior art is easily damaged after long-term use, affecting normal use.

[0006] (II) Technical solution

[0007] The utility model is implemented through the following technical scheme: a normally closed electric two-way valve, including an electric actuator and a valve body, the outer surface of the valve body is fixedly connected to a valve seat, the inner wall of the valve body is fixedly connected to a fixed cylinder, the bottom end of the fixed cylinder is fixedly connected to the valve body and the top end is connected to the valve seat, the inner wall of the fixed cylinder is slidably connected to a sliding sleeve, the inner wall of the sliding sleeve is fixedly connected to a top plate, the upper surface of the top plate is plugged with a valve stem, the bottom end of the valve stem is fixedly connected to a fixed plate, the outer surface of the fixed cylinder is provided with two symmetrically arranged first flow openings, the outer surface of the sliding sleeve is provided with two symmetrically arranged second flow openings, and the first flow opening is located above the second flow opening.

[0008] Preferably, a drain port is provided on the outer surface of the sliding sleeve, and the drain port is located below the first circulation port, and when the sliding sleeve moves to the bottom, the drain port and the second circulation port are located at the same height. By providing the drain port, when the fixed plate descends, the accumulated water retained in the fixed cylinder below the fixed plate can be squeezed out through the fixed plate. The squeezing out of the accumulated water can slow down the speed of the fixed plate's descending recovery, reduce the impact of the fixed plate on the sliding sleeve, and thus be beneficial to the overall stability.

[0009] Preferably, a sealing ring is installed at the top of the sliding sleeve, and the sealing ring is tightly fitted with the inner wall of the fixed tube. The sealing of the sealing ring can prevent the liquid in the fixed tube from entering the top of the top plate, which is beneficial to the overall stability.

[0010] Preferably, a connecting seat is fixedly connected to the bottom surface of the electric actuator, the output end of the electric actuator is connected to the valve stem, the inner wall of the connecting seat is fixedly connected to an auxiliary plate, and the connecting seat and the valve seat are connected by bolts, which is beneficial to the stability between the electric actuator and the valve body, and thus can maintain the overall stability.

[0011] Preferably, the outer surface of the valve stem is fixedly connected to a platform plate, the upper surface of the platform plate is fixedly connected to a return spring, the other end of the return spring is in contact with the auxiliary plate, and through the elastic force of the return spring, when the whole is not powered, the return spring squeezes the platform plate to move the sliding sleeve to the bottom and limit the sliding sleeve.

[0012] Preferably, the first circulation opening and the second circulation opening have the same size, the drain opening and the second circulation opening have the same size, and the size of the second circulation opening is smaller than the distance from the top plate to the bottom wall of the sliding sleeve, which is beneficial to the stability of the first circulation opening, the second circulation opening and the drain opening, and thus can maintain the overall stability.

[0013] The utility model provides a normally closed electric two-way valve, which has the following beneficial effects:

[0014] 1. The normally closed electric two-way valve is provided with a sliding sleeve and a first flow port and a second flow port. The first flow port and the second flow port are staggered, so that the water flow impacts the sliding sleeve instead of the common water flow impacting the valve disc during opening and closing, thereby alleviating the influence of the water hammer effect on the whole during opening and closing, and solving the problem in the prior art that the valve disc of the normally closed two-way valve is easily damaged after long-term use, affecting normal use.

[0015] 2. The normally closed electric two-way valve is provided with a platform plate on the outer surface of the valve stem and a reset spring on the upper surface of the platform plate, and a sealing ring is provided at the same time, so that the working environment of the reset spring can be maintained in a dry state, which is beneficial to the stability of the reset spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the front view structure of the valve seat of the utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the valve body of the utility model;

[0018] Figure 3 It is a cross-sectional view of the side view of the valve body of the utility model;

[0019] Figure 4 It is a schematic side view of the first flow port of the utility model.

[0020] Description of Reference Numerals

[0021] 1. Electric actuator; 2. Valve body; 3. Valve seat; 4. Fixed cylinder; 5. Sliding sleeve; 6. Top plate; 7. Valve stem; 8. Fixed plate; 9. First flow port; 10. Second flow port; 11. Drain port; 12. Sealing ring; 13. Connecting seat; 14. Auxiliary plate; 15. Platform plate; 16. Reset spring. DETAILED DESCRIPTION

[0022] The embodiment of the utility model provides a normally closed electric two-way valve.

[0023] Please refer to Figure 1 , Figure 2 and Figure 3 , including an electric actuator 1 and a valve body 2, the outer surface of the valve body 2 is fixedly connected to a valve seat 3, the inner wall of the valve body 2 is fixedly connected to a fixed cylinder 4, the bottom end of the fixed cylinder 4 is fixedly connected to the valve body 2 and the top end is connected to the valve seat 3, the inner wall of the fixed cylinder 4 is slidably connected to a sliding sleeve 5, the inner wall of the sliding sleeve 5 is fixedly connected to a top plate 6, the upper surface of the top plate 6 is plugged with a valve stem 7, the bottom end of the valve stem 7 is fixedly connected to a fixed plate 8, the outer surface of the fixed cylinder 4 is provided with two symmetrically arranged first flow ports 9, the outer surface of the sliding sleeve 5 is provided with two symmetrically arranged second flow ports 10, and the first flow port 9 is located above the second flow port 10.

[0024] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4A drain port 11 is provided on the outer surface of the sliding sleeve 5, and the drain port 11 is located below the first circulation port 9, and when the sliding sleeve 5 moves to the bottom, the drain port 11 and the second circulation port 10 are located at the same height. By setting the drain port 11, when the fixed plate 8 descends, the accumulated water retained in the fixed cylinder 4 below the fixed plate 8 can be squeezed out through the fixed plate 8. The squeezing out of the accumulated water can slow down the speed of the fixed plate 8 descending and recovering, and reduce the impact of the fixed plate 8 on the sliding sleeve 5, which is beneficial to the overall stability. The first circulation port 9 and the second circulation port 10 have the same size, and the drain port 11 has the same size as the second circulation port 10. The size of the second circulation port 10 is smaller than the distance from the top plate 6 to the bottom wall of the sliding sleeve 5, which is beneficial to the stability of the first circulation port 9, the second circulation port 10 and the drain port 11, and thus can maintain the overall stability.

[0025] Please refer to Figure 2 and Figure 3 A sealing ring 12 is installed on the top of the sliding sleeve 5, and the sealing ring 12 is tightly fitted with the inner wall of the fixed cylinder 4. The sealing of the sealing ring 12 can prevent the liquid in the fixed cylinder 4 from entering the top of the top plate 6, which is beneficial to the overall stability. The bottom surface of the electric actuator 1 is fixedly connected with a connecting seat 13, and the output end of the electric actuator 1 is connected to the valve stem 7. The inner wall of the connecting seat 13 is fixedly connected with an auxiliary plate 14. The connecting seat 13 is connected to the valve seat 3 by bolts, which is beneficial to the stability between the electric actuator 1 and the valve body 2, and can maintain the overall stability.

[0026] Please refer to Figure 2 and Figure 3 The outer surface of the valve stem 7 is fixedly connected with a platform plate 15, and the upper surface of the platform plate 15 is fixedly connected with a return spring 16, and the other end of the return spring 16 is in contact with the auxiliary plate 14. Through the elastic force of the return spring 16, when the whole is not powered, the return spring 16 squeezes the platform plate 15, thereby moving the sliding sleeve 5 to the bottom and limiting the sliding sleeve 5.

[0027] When the utility model is in use: first, the overall installation is completed, and then the electric actuator 1 is energized. When it is in the normally closed state, the electric actuator 1 does not work. At this time, the reset spring 16 pushes the platform plate 15 to move, and the movement of the platform plate 15 drives the valve stem 7 to move. The movement of the valve stem 7 drives the fixed plate 8 to move, and the fixed plate 8 pushes the sliding sleeve 5 to descend. The sliding sleeve 5 moves to the bottom end of the fixed cylinder 4. At this time, the first flow port 9 and the second flow port 10 are located at different heights. The fixed cylinder 4 blocks the second flow port 10 while the sliding sleeve 5 blocks the first flow port 9. At this time, water cannot flow, and the whole is in the normally closed state.

[0028] When it is necessary to open, start the electric actuator 1, and the output end of the electric actuator 1 drives the valve stem 7 to rise, and the rise of the valve stem 7 drives the fixed plate 8 to rise. After the fixed plate 8 rises, it pushes the top plate 6 to rise and then drives the sliding sleeve 5 to rise. At this time, the first flow port 9 and the second flow port 10 are at the same height, and the water flows out of the whole through the first flow port 9 and the second flow port 10, completing the circulation of the water.

[0029] During the overall opening and closing process, by setting the sliding sleeve 5 and opening the first flow port 9 and the second flow port 10, and at the same time staggered distribution of the first flow port 9 and the second flow port 10, the common water flow impact on the valve disc during opening and closing is changed to the water flow impact on the sliding sleeve 5, thereby alleviating the influence of the water hammer effect on the whole during opening and closing, and solving the problem in the prior art that the valve disc of the normally closed two-way valve is easily damaged after long-term use, affecting normal use.

[0030] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A normally closed electric two-way valve, comprising an electric actuator (1) and a valve body (2), characterized in that: The outer surface of the valve body (2) is fixedly connected to a valve seat (3), the inner wall of the valve body (2) is fixedly connected to a fixed cylinder (4), the bottom end of the fixed cylinder (4) is fixedly connected to the valve body (2) and the top end is connected to the valve seat (3), the inner wall of the fixed cylinder (4) is slidably connected to a sliding sleeve (5), the inner wall of the sliding sleeve (5) is fixedly connected to a top plate (6), the upper surface of the top plate (6) is plugged with a valve stem (7), the bottom end of the valve stem (7) is fixedly connected to a fixed plate (8), the outer surface of the fixed cylinder (4) is provided with two symmetrically arranged first flow openings (9), the outer surface of the sliding sleeve (5) is provided with two symmetrically arranged second flow openings (10), the first flow opening (9) is located above the second flow opening (10).

2. A normally closed electric two-way valve according to claim 1, characterized in that: The outer surface of the sliding sleeve (5) is provided with a drainage port (11), the drainage port (11) is located below the first circulation port (9), and when the sliding sleeve (5) moves to the bottom, the drainage port (11) and the second circulation port (10) are located at the same height.

3. A normally closed electric two-way valve according to claim 1, characterized in that: A sealing ring (12) is installed at the top end of the sliding sleeve (5), and the sealing ring (12) is tightly fitted with the inner wall of the fixed cylinder (4).

4. A normally closed electric two-way valve according to claim 1, characterized in that: The bottom surface of the electric actuator (1) is fixedly connected to a connecting seat (13), the output end of the electric actuator (1) is connected to the valve stem (7), the inner wall of the connecting seat (13) is fixedly connected to an auxiliary plate (14), and the connecting seat (13) is connected to the valve seat (3) by bolts.

5. A normally closed electric two-way valve according to claim 1, characterized in that: The outer surface of the valve stem (7) is fixedly connected to a platform plate (15), and the upper surface of the platform plate (15) is fixedly connected to a return spring (16), and the other end of the return spring (16) is in contact with the auxiliary plate (14) through the elastic force of the return spring (16).

6. A normally closed electric two-way valve according to claim 2, characterized in that: The first circulation opening (9) and the second circulation opening (10) have the same size, the drainage opening (11) and the second circulation opening (10) have the same size, and the size of the second circulation opening (10) is smaller than the distance from the top plate (6) to the inner bottom wall of the sliding sleeve (5).

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