High bypass valve with valve element protection structure

Abstract

The utility model relates to the technical field of high-pressure side valves, and discloses a high-pressure side valve with a valve core protection structure, which comprises a valve seat main body, a valve rod and a valve core, a spring is assembled on the valve core, and a protection sleeve for protection can be assembled outside the valve core. The special protective sleeve is arranged on the valve element, it can be guaranteed that wet steam or foreign matter passing through the valve seat body does not directly scour the valve element, it is reliably guaranteed that the valve element is not damaged by blowing, after the protective sleeve is assembled and steam passes through the hole, the flow of the steam can be blocked and protected through the protective sleeve, the airflow direction is changed, airflow opposite flushing is formed, and the safety of the valve element is improved. The pre-starting valve is arranged on the valve core, so that the pre-starting valve cannot directly scour the position of the valve core, meanwhile, the spring and the valve core can be assembled for use, when the valve is closed, the valve core overcomes the jacking force of the spring under the thrust action of an executing mechanism, the pre-starting valve sealing surface is attached to the valve core sealing surface, and the balance hole channel is closed, so that the overall sealing capability is better improved in the working process.

Description

TECHNICAL FIELD

[0001] The utility model relates to high bypass valve technical field, concretely is a high bypass valve with valve core protection structure. BACKGROUND

[0002] High bypass valve is a kind of equipment for unit start-stop and accident situation, high bypass valve, i.e. high-pressure bypass valve, its main function is to guide main steam to the reheated steam pipeline behind the high-pressure cylinder of steam turbine after boiler ignition and steam turbine start-up, to ensure that reheated steam has steam passing through, thereby avoiding the damage of equipment due to lack of steam;

[0003] And power plant adopts medium-pressure cylinder start-up, after superheated steam works, steam pressure drops, temperature reduces and becomes wet steam, high-speed wet steam passes through high-low bypass flow sleeve, and the surface of valve core is generated scouring impact, since sleeve is round hole, high-speed steam directly hits on valve line after passing through round hole, causes valve line to be scoured and not to play sealing effect, leads to valve not to close tightly and leaks. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of high bypass valves with valve core protection structure, to solve the problem that high-speed wet steam passes through high-low bypass flow sleeve, and the surface of valve core is generated scouring impact, since sleeve is round hole, high-speed steam directly hits on valve line after passing through round hole, causes valve line to be scoured and not to play sealing effect, leads to valve not to close tightly and leaks in the above background technique.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of high bypass valve with valve core protection structure, including valve seat main body, valve rod, valve core, the valve core is equipped with spring, graphite seal ring is installed in the valve seat main body, the space in the valve seat main body is divided into upper cavity and lower cavity by graphite seal ring, the right side of the valve seat main body is formed with return port close to upper position, the outside of the valve core can also be equipped with protective sleeve for protection.

[0006] Preferably, the top end position of the valve seat main body is formed with inlet, and the bottom position of the valve seat main body is formed with outlet.

[0007] Preferably, the middle position of the graphite seal ring is formed with balance hole, and the top of the valve core is connected with the valve rod.

[0008] Preferably, the upper cavity and the lower cavity are communicated with each other when the valve seat main body is in open state, and the top position of the valve rod is equipped with an actuator.

[0009] Preferably, a hole plate can be further assembled at the position of the side edge of the valve core in the valve seat main body, and the inner portion of the hole plate is distributed with holes.

[0010] Preferably, the holes are uniformly distributed inside the hole plate, and the outer part of the valve core is provided with a groove.

[0011] Preferably, the groove is matched with the protective sleeve in shape, and the holes are used for the circulation of wet steam.

[0012] Preferably, mounting plates are mounted on both sides of the inside of the inlet, the top end of the mounting plate is connected with a filter screen, and the mounting plate and the filter screen are connected by bolts.

[0013] Compared with the prior art, the high by-pass valve with the valve core protection structure has the advantages that the sealing capacity is improved, and the water inlet filtering capacity of the high by-pass valve is also improved.

[0014] (1) The wet steam or foreign matters passing through the valve seat body can not directly wash the valve core by the special protective sleeve on the valve core, so that the valve core is not damaged, the flow of the steam passing through the holes is blocked by the protective sleeve after assembly, the flow direction is changed, the steam is collided, the valve core is not directly washed, the spring is assembled with the valve core, the pilot valve is opened in the opening and closing process, the spring is mounted on the valve core, the valve core is balanced by the balance hole to ensure the pressure balance of the upper and lower cavities of the valve core, the balance hole channel is closed by the pre-opening valve sealing surface and the valve core sealing surface in the closing process of the valve, and the balance hole does not leak, so that the sealing capacity of the whole is improved.

[0015] (2) The mounting plate is mounted on both sides of the inlet, and the filter screen is connected and assembled by bolts, so that the filter screen can filter when entering, the impurity content is reduced, and the damage of the valve seat body caused by the storage of substances in the valve seat body is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front view structural schematic diagram of the utility model;

[0017] Figure 2 It is a rear view structural schematic diagram of the utility model;

[0018] Figure 3 It is a local plan view structural schematic diagram of the adjusting structure of the utility model;

[0019] Figure 4 It is an enlarged structural schematic diagram of the filter screen mounting mode of the utility model.

[0020] In the figure: 1, valve seat body; 2, inlet; 3, valve stem; 4, valve core; 5, spring; 6, graphite seal ring; 7, outlet; 8, balance hole; 9, return port; 10, protective sleeve; 11, hole plate; 12, hole; 13, filter screen; 14, mounting plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0022] Please refer to Figures 1-4 An embodiment provided by the utility model: a high side valve with valve core protection structure, comprising valve seat body 1, valve stem 3, valve core 4, spring 5 is assembled on valve core 4, graphite seal ring 6 is installed in valve seat body 1, the space in valve seat body 1 is divided into upper cavity and lower cavity by graphite seal ring 6, return port 9 is formed at the position close to the upper side of the right side in valve seat body 1, protective sleeve 10 for protection can also be assembled on the outside of valve core 4.

[0023] Inlet 2 is formed at the top end position of valve seat body 1, and outlet 7 is formed at the bottom position of valve seat body 1.

[0024] Balance hole 8 is formed at the middle position in graphite seal ring 6, and the top of valve core 4 is connected with valve stem 3.

[0025] The upper cavity and the lower cavity are communicated with each other when valve seat body 1 is in the open state, and the top position of valve stem 3 is provided with an actuator.

[0026] Hole plate 11 can also be assembled at the position of the side edge of valve core 4 in valve seat body 1, and hole 12 is distributed in the inner part of hole plate 11.

[0027] Hole 12 is uniformly distributed in the inner part of hole plate 11, and a groove is formed in the outside of valve core 4.

[0028] The groove is matched with protective sleeve 10, and hole 12 is used for the circulation of wet steam.

[0029] Mounting plate 14 is installed at both sides in the inner part of inlet 2, filter screen 13 is connected at the top end of mounting plate 14, and mounting plate 14 and filter screen 13 are connected by bolts.

[0030] As Figure 1 and Figure 2As shown in Embodiment 1, the improved valve core 4 adopts a pilot-operated structure, which is still balanced, but adopts a combination of pilot valve and graphite sealing ring 6. During the valve opening and closing process, the pilot valve is opened. The valve core 4 is equipped with a spring 5, so that the valve can ensure the pressure balance of the upper and lower chambers of the valve core 4 through the balance hole 8. The valve opening and closing force is small. When the valve is closed, the valve core 4 overcomes the spring 5 under the thrust of the actuator. The sealing surface of the pre-opening valve is in contact with the sealing surface of the valve core 4, and the balance hole 8 is closed, so that the balance hole 8 does not leak.

[0031] like Figure 3 As shown in Embodiment 2, the valve core 4 can also be protected by a protective sleeve 10. This protective method ensures that the valve core 4 is not directly impacted by wet steam. The valve core 4 has a special protective sleeve 10, which ensures that the wet steam or foreign objects passing through the valve are not directly impacted by the valve core 4, reliably protecting the valve core from damage. The increased width of the sealing surface increases the contact area, thus reducing the probability of the valve sealing surface being damaged. The adjustment of the sealing surface angle changes the airflow direction, creating airflow counterflow to achieve mutual pressure reduction instead of directly impacting the internal parts of the valve. This protects the valve core 4 and valve seat body 1, and only the valve core 4 is modified while retaining the valve stem 3, greatly reducing the modification cost.

[0032] The modified high-pressure bypass valve, composed of components such as valve seat body 1 and valve core 4, can maintain a tight seal for a long period of time, which is beneficial to the long-term safe operation of the unit.

[0033] Working principle: First, there is a special protective sleeve 10 on the valve core 4, which can ensure that wet steam or foreign objects passing through the valve seat body 1 do not directly wash onto the valve core 4, reliably ensuring that the valve core 4 is not damaged by blowing. After the protective sleeve 10 is installed, when the steam passes through the hole 12, its flow can be blocked and protected by the protective sleeve 10, so that the airflow direction is changed and airflow counterflow is formed, so that it will not directly wash onto the position of the valve core 4. At the same time, the spring 5 can be used to assemble with the valve core 4. During the opening and closing process, the pilot valve is opened, and the valve core 4 is equipped with the spring 5, so that the valve can maintain the pressure balance between the upper and lower chambers of the valve core 4 through the balance hole 8. When the valve is closed, the valve core 4 overcomes the top force of the spring 5 under the thrust of the actuator, and the sealing surface of the pre-opening valve is in contact with the sealing surface of the valve core 4, closing the balance hole 8 channel, so that the balance hole 8 does not leak.

[0034] In the description of the utility model, it is to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication。For ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

Claims

1. A high-speed bypass valve with a valve core protection structure, comprising a valve seat body (1), a valve stem (3), and a valve core (4), characterized in that: A spring (5) is mounted on the valve core (4), a graphite sealing ring (6) is installed inside the valve seat body (1), the space inside the valve seat body (1) is divided by the graphite sealing ring (6) to form an upper cavity and a lower cavity, a return port (9) is formed on the right side of the valve seat body (1) near the top, and a protective sleeve (10) can also be mounted on the outside of the valve core (4) for protection.

2. A high-speed bypass valve with a valve core protection structure according to claim 1, characterized in that: An inlet (2) is formed at the top of the valve seat body (1), and an outlet (7) is formed at the bottom of the valve seat body (1).

3. A high-voltage bypass valve with a valve core protection structure according to claim 1, characterized in that: A balance hole (8) is formed in the middle of the graphite sealing ring (6), and the top of the valve core (4) is connected to the valve stem (3).

4. A high-voltage bypass valve with a valve core protection structure according to claim 1, characterized in that: When the valve seat body (1) is in the open state, the upper cavity and the lower cavity are connected to each other, and the valve stem (3) is equipped with an actuator at the top position.

5. A high-voltage bypass valve with a valve core protection structure according to claim 1, characterized in that: A perforated plate (11) may also be installed inside the valve seat body (1) at the position on the side of the valve core (4), and the perforated plate (11) has holes (12) distributed inside.

6. A high-speed bypass valve with a valve core protection structure according to claim 5, characterized in that: The holes (12) are evenly distributed inside the orifice plate (11), and the valve core (4) has a groove on its outside.

7. A high-voltage bypass valve with a valve core protection structure according to claim 6, characterized in that: The groove shape is adapted to the protective sleeve (10), and the hole (12) is used for the flow of wet steam.

8. A high-voltage bypass valve with a valve core protection structure according to claim 2, characterized in that: The inlet (2) has mounting plates (14) installed on both sides inside. A filter screen (13) is connected to the top of the mounting plate (14). The mounting plate (14) and the filter screen (13) are connected by bolts.

Images