Pressure regulating valve

Abstract

The invention relates to the technical field of valves, in particular to a pressure regulating valve, which comprises an inlet cavity, an outlet cavity, a pressure regulating valve and a pressure regulating valve, the valve seat and the valve clack are arranged between the inlet cavity and the outlet cavity; the pressure regulating control assembly acts on the valve clack through the valve rod, so that the valve clack is close to or far away from the valve seat to separate or communicate the inlet cavity and the outlet cavity; the extension cavity extends in the axial direction of the valve rod from the pressure induction cavity and is communicated to the pressure regulation control assembly, the end, away from the pressure induction cavity, of the extension cavity serves as a gas phase containing part and is filled with a gas phase medium generated by heating and vaporizing of a liquid phase medium in the pressure induction cavity during use, and the valve rod movably penetrates through the extension cavity; at least part of the pressure regulating control assembly communicates with the external environment all the time, and the pressure regulating control assembly is configured to respond to pressure changes in the pressure sensing cavity to drive the valve rod to move. The gas-phase containing part of the extension cavity is filled with the gas-phase medium, the low temperature of the liquid-phase medium can be isolated, heat transfer in the valve is reduced, and icing is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a pressure regulating valve. Background Art

[0002] With the widespread use of cryogenic media such as liquid oxygen, liquid nitrogen, liquid argon and liquefied natural gas, these media are usually stored in liquid form. However, during transportation or use, such cryogenic liquid media will inevitably vaporize. In order to ensure the stability of the medium pipeline, it is usually necessary to configure a pressure regulating valve in the pipeline.

[0003] The structure of the pressure regulating valve for low temperature medium in the prior art is as follows: Figure 1 As shown, it is provided with an inlet 01 and an outlet 02 for medium circulation, a valve flap 03 and a valve seat 04 arranged between the inlet 01 and the outlet 02. The valve flap 03 moves close to or away from the valve seat 04 under the action of the valve stem 05, so as to realize the connection and closure between the inlet 01 and the outlet 02. A diaphragm 06 is arranged at the top of the valve stem 05, and the diaphragm 06 is airtightly connected to the valve body. One side of the diaphragm 06 is an outlet chamber 07, which is connected to the outlet 02. The other side of the diaphragm 06 is a pressure regulating chamber 08, and a spring 09 with an adjustable pre-pressure degree is arranged in the pressure regulating chamber 08. The pressure regulating chamber 08 is always connected to the atmosphere through the breathing hole 010.

[0004] When the pressure at the outlet 02 is higher than the preset pressure value, the diaphragm 06 is pushed upward (toward the pressure regulating chamber 08 ), and the valve disc 03 contacts the valve seat 04 under the action of the medium at the inlet 01 , thereby achieving closure between the inlet 01 and the outlet 02 .

[0005] When the pressure of the outlet 02 is lower than the preset pressure value, the diaphragm 06 is pushed downward (toward the outlet chamber 07) by the action of the spring 09, thereby pushing the valve stem 05 to move, separating the valve disc 03 from the valve seat 04, and achieving communication between the inlet 01 and the outlet 02.

[0006] Since one side of the diaphragm 06 (the outlet chamber 07 side) is in direct contact with the low-temperature medium and has a relatively low temperature, and the other side of the diaphragm 06 (the pressure regulating chamber 08 side) is always connected to the atmosphere through the breathing hole 010, water vapor in the atmosphere enters the pressure regulating chamber 08 through the breathing hole 010, and is easily condensed and frozen at the diaphragm 06, thereby affecting the response speed of the diaphragm 06. In severe cases, it may also cause the diaphragm 06 to be unable to move up and down normally, thereby causing the pressure regulating valve to fail. Summary of the invention

[0007] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a pressure regulating valve which can reduce heat transfer in the valve and prevent freezing.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The present invention provides a pressure regulating valve, comprising: an inlet chamber and an outlet chamber for circulating a liquid phase medium, one of the inlet chamber and the outlet chamber serving as a pressure sensing chamber; a valve seat and a valve flap arranged between the inlet chamber and the outlet chamber; a pressure regulating control component, which acts on the valve flap through a valve stem to make the valve flap approach or move away from the valve seat to isolate or connect the inlet chamber and the outlet chamber; an extended chamber, which extends from the pressure sensing chamber along the axial direction of the valve stem and is connected to the pressure regulating control component, and an end of the extended chamber away from the pressure sensing chamber serves as a gas phase containing part. When in use, the gas phase containing part is filled with a gas phase medium generated by the liquid phase medium in the pressure sensing chamber being heated and vaporized, the valve stem is movably arranged in the extended chamber, the pressure regulating control component is at least partially connected to the external environment at all times, and the pressure regulating control component is configured to drive the valve stem to move in response to the pressure change in the pressure sensing chamber.

[0010] Preferably, the extension chamber is formed inside the extension piece, and a necking area is provided on the extension piece and / or the valve stem.

[0011] Preferably, the position of the necking area on the extension piece and / or the valve stem is arranged so that the necking area is located above the liquid level of the liquid medium in the extension chamber when the pressure regulating valve is in use.

[0012] Preferably, the extension chamber is formed inside the extension piece, and a heat dissipation structure is provided on the extension piece and / or the valve stem.

[0013] Preferably, the extension chamber is formed inside the extension piece, a guide sleeve is provided between the valve stem and the extension piece, one of the valve stem and the extension piece is connected to the guide sleeve, and the other of the valve stem and the extension piece is clearance-matched with the guide sleeve.

[0014] Preferably, the pressure regulating control component includes a shell, a piston and a first spring. The shell is hollow inside, and the piston is reciprocatingly arranged inside the shell and divides the internal space of the shell into a first chamber and a second chamber. The first spring is arranged in the first chamber and presses the piston toward the second chamber. The shell is provided with a breathing hole connecting the first chamber with the outside of the shell, and the second chamber is connected to the extension chamber. When the pressure regulating control component drives the valve stem to move, the valve stem is connected or abutted against the piston.

[0015] Preferably, the piston comprises a first piston close to the first chamber, a second piston close to the second chamber, a sealing ring arranged between the first piston and the housing, and a sealing ring compressed between the first piston, the second piston and the housing.

[0016] Preferably, a gap is formed between the first piston and the second piston.

[0017] Preferably, the first piston and the second piston do not contact each other.

[0018] Preferably, the sealing ring comprises a first sealing ring and a second sealing ring abutting against each other, the first sealing ring contacts the first piston and the housing, the second sealing ring contacts the second piston and the housing, and the contact surface between the first sealing ring and the second sealing ring is a conical surface.

[0019] Preferably, the valve flap includes a sealing portion and a rod portion arranged on the sealing portion, the sealing portion is arranged opposite to the valve seat on a side of the valve seat away from the pressure sensing chamber, the rod portion is located in the pressure sensing chamber, the valve stem is connected to the pressure regulating control assembly, and when the valve stem acts on the valve flap, an end of the valve stem close to the valve flap abuts against an end of the rod portion away from the sealing portion, and a second spring is provided on the side of the sealing portion away from the valve seat, and the second spring presses the sealing portion against the valve seat.

[0020] Preferably, one end of the rod portion away from the sealing portion extends into the extension chamber.

[0021] Compared with the prior art, the present invention has significant improvements:

[0022] When the pressure regulating valve of the present invention is applied to low-temperature liquid phase media such as liquid oxygen, liquid nitrogen, liquid argon, liquefied natural gas, etc., part of the low-temperature liquid phase medium in the pressure sensing chamber will be vaporized into a gas phase medium due to heat absorption. By arranging an extension chamber extending along the axial direction of the valve stem between the pressure sensing chamber and the pressure regulating control component, and the end of the extension chamber away from the pressure sensing chamber is used as a gas phase containing part, when in use, the gas phase medium vaporized in the pressure sensing chamber will enter the extension chamber and fill the gas phase containing part of the extension chamber. The gas phase medium filled in the gas phase containing part can form a gas phase layer with a certain thickness in the end of the extension chamber away from the pressure sensing chamber. The gas phase layer can hinder the liquid phase medium from further rising in the extension chamber and separate the liquid phase medium from the pressure regulating control component, thereby increasing the distance from the liquid phase medium as a cold source to the pressure regulating control component, effectively isolating the low temperature of the liquid phase medium, reducing the heat transfer between the liquid phase medium and the pressure regulating control component, and effectively reducing the possibility of freezing of the pressure regulating control component. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a pressure regulating valve in the prior art.

[0024] Figure 2 Schematic diagram of the structure of the pressure regulating valve according to the embodiment of the present invention.

[0025] The reference numerals are described as follows:

[0026] 01 Import

[0027] 02 Exit

[0028] 03 Valve disc

[0029] 04 Valve Seat

[0030] 05 Valve stem

[0031] 06 Diaphragm

[0032] 07 Exit Chamber

[0033] 08 Pressure regulating chamber

[0034] 09 Spring

[0035] 010 Breathing hole

[0036] 1 Entrance chamber

[0037] 2 Exit chamber

[0038] 3 Valve seat

[0039] 4 Disc

[0040] 41 Sealing part

[0041] 42 Rod

[0042] 5 Voltage regulation control components

[0043] 51 Shell

[0044] 511 First Chamber

[0045] 512 Second Chamber

[0046] 513 Breathing Hole

[0047] 52 Piston

[0048] 521 First Piston

[0049] 522 Second Piston

[0050] 523 Sealing ring

[0051] 524 Sealing ring

[0052] 524a First sealing ring

[0053] 524b Second sealing ring

[0054] 53 First Spring

[0055] 6 Valve stem

[0056] 7 Extended chamber

[0057] 8 Extension

[0058] 9 Valve body

[0059] 10 Neck zone

[0060] 11 Second Spring

[0061] 12 Spring chamber DETAILED DESCRIPTION

[0062] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0063] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0066] like Figure 2 The figure shows an embodiment of the pressure regulating valve provided by the present invention. The pressure regulating valve of this embodiment is suitable for low-temperature liquid phase media in the liquid phase flow channel, such as liquid oxygen, liquid nitrogen, liquid argon, liquefied natural gas, etc.

[0067] The pressure regulating valve of this embodiment includes an inlet chamber 1 , an outlet chamber 2 , a valve seat 3 , a valve flap 4 , a pressure regulating control assembly 5 , a valve stem 6 and an extended chamber 7 .

[0068] Among them, the inlet chamber 1 and the outlet chamber 2 are used for the circulation of liquid phase medium. The inlet chamber 1 and the outlet chamber 2 are both formed inside the valve body 9, and the end of the inlet chamber 1 away from the outlet chamber 2 penetrates the valve body 9 to form a liquid phase medium inlet for the liquid phase medium to flow in; the end of the outlet chamber 2 away from the inlet chamber 1 penetrates the valve body 9 to form a liquid phase medium outlet for the liquid phase medium to flow out. One of the inlet chamber 1 and the outlet chamber 2 serves as a pressure sensing chamber, and the pressure sensing chamber cooperates with the pressure regulating control component 5. The other of the inlet chamber 1 and the outlet chamber 2 serves as a non-pressure sensing chamber.

[0069] The valve seat 3 and the valve flap 4 are arranged between the inlet chamber 1 and the outlet chamber 2. The valve seat 3 is annular with a through middle portion, and the valve seat 3 is arranged between the inlet chamber 1 and the outlet chamber 2. The inlet chamber 1 and the outlet chamber 2 are connected through the through middle portion of the valve seat 3. The valve flap 4 is arranged opposite to the valve seat 3 on one side of the valve seat 3.

[0070] The pressure regulating control assembly 5 acts on the valve disc 4 through the valve stem 6, so that the valve disc 4 approaches or moves away from the valve seat 3 to isolate or connect the inlet chamber 1 with the outlet chamber 2. When the valve disc 4 approaches the valve seat 3 and contacts the valve seat 3 under the action of the valve stem 6, the valve disc 4 closes the valve seat 3, thereby isolating the inlet chamber 1 from the outlet chamber 2, and the pressure regulating valve is closed at this time. When the valve disc 4 moves away from the valve seat 3 and separates from the valve seat 3, the valve disc 4 opens the valve seat 3, thereby connecting the inlet chamber 1 with the outlet chamber 2, and the pressure regulating valve is opened at this time.

[0071] The extended chamber 7 extends from the pressure sensing chamber along the axial direction of the valve stem 6 and is connected to the pressure regulating control assembly 5, that is, the extended chamber 7 is arranged between the pressure sensing chamber and the pressure regulating control assembly 5, one end of the extended chamber 7 is connected to the pressure sensing chamber, the other end of the extended chamber 7 is connected to the pressure regulating control assembly 5, and the extended chamber 7 extends between its two ends. The end of the extended chamber 7 away from the pressure sensing chamber serves as a gas phase containing part. When in use, the gas phase containing part is filled with a gas phase medium generated by the liquid phase medium in the pressure sensing chamber being heated and vaporized. In order to facilitate the gas phase medium to fill the gas phase containing part at the end of the extended chamber 7 away from the pressure sensing chamber, preferably, the position of the end of the extended chamber 7 away from the pressure sensing chamber is higher than the position of the other end of the extended chamber 7 close to the pressure sensing chamber. The pressure in the pressure sensing chamber acts on the pressure regulating control assembly 5 through the extended chamber 7. The valve stem 6 can be movably arranged in the extended chamber 7. The pressure regulating control assembly 5 is at least partially connected to the external environment at all times, and is configured to drive the valve stem 6 to move in response to pressure changes in the pressure sensing chamber, and the movement of the valve stem 6 drives the valve flap 4 to move.

[0072] In this embodiment, the valve flap 4 is arranged opposite to the valve seat 3 on the side of the valve seat 3 away from the pressure sensing chamber, that is, the valve flap 4 is arranged opposite to the valve seat 3 in the non-pressure sensing chamber, and the valve stem 6 acts on the valve flap 4 on the side of the pressure sensing chamber. When the pressure in the pressure sensing chamber is lower than the preset value, the pressure regulating control component 5 overcomes the pressure in the pressure sensing chamber and moves toward the direction close to the pressure sensing chamber, and drives the valve stem 6 to move toward the direction close to the pressure sensing chamber, and pushes the valve flap 4 away from the valve seat 3 through the valve stem 6, so that the pressure regulating valve is opened, and the pressure sensing chamber is connected with the non-pressure sensing chamber, that is, the inlet chamber 1 is connected with the outlet chamber 2. When the pressure in the pressure sensing chamber is higher than the preset value, the pressure regulating control assembly 5 releases the resistance of the valve stem 6 moving away from the pressure sensing chamber under the action of the pressure in the pressure sensing chamber, the pressure acting on the valve disc 4 through the valve stem 6 disappears, the valve disc 4 approaches and is pressed against the valve seat 3, so that the pressure regulating valve is closed, and the pressure sensing chamber is isolated from the non-pressure sensing chamber, that is, the inlet chamber 1 is isolated from the outlet chamber 2.

[0073] When the pressure regulating valve of this embodiment is used for low-temperature liquid phase media such as liquid oxygen, liquid nitrogen, liquid argon, liquefied natural gas, etc., part of the low-temperature liquid phase medium in the pressure sensing chamber will be vaporized into gas phase medium due to heat absorption. By providing an extended chamber 7 extending along the axial direction of the valve stem 6 between the pressure sensing chamber and the pressure regulating control component 5, and the end of the extended chamber 7 away from the pressure sensing chamber is used as a gas phase containing part, when in use, the gas phase medium vaporized in the pressure sensing chamber will enter the extended chamber 7 and fill the gas phase containing part of the extended chamber. The gas phase medium filled in the gas phase containing part can form a gas phase layer with a certain thickness in the end of the extended chamber 7 away from the pressure sensing chamber. The gas phase layer can prevent the liquid phase medium from further rising in the extended chamber 7 and separate the liquid phase medium from the pressure regulating control component 5, thereby increasing the distance from the liquid phase medium as a cold source to the pressure regulating control component 5, effectively isolating the low temperature of the liquid phase medium, reducing the heat transfer between the liquid phase medium and the pressure regulating control component 5, and effectively reducing the possibility of freezing of the pressure regulating control component 5.

[0074] In this embodiment, the extended chamber 7 is formed inside the extended member 8. One end of the extended member 8 is airtightly connected and fixed to the valve body 9 forming the pressure sensing chamber, and the other end of the extended member 8 is airtightly connected and fixed to the pressure regulating control assembly 5. In addition, the extended member 8 extends between the valve body 9 and the pressure regulating control assembly 5, and the extended chamber 7 passes through the extended member 8 along the extending direction of the extended member 8, so that the pressure sensing chamber and the pressure regulating control assembly 5 can be connected at both ends.

[0075] Preferably, a necking area 10 is provided on the extension piece 8 and / or the valve stem 6. The necking area 10 is a structure with a reduced cross-sectional area on the extension piece 8 and / or the valve stem 6, that is, the cross-sectional area of ​​the necking area 10 on the extension piece 8 and / or the valve stem 6 is smaller than the cross-sectional area of ​​other parts on the extension piece 8 and / or the valve stem 6. The necking area 10 with a reduced cross-sectional area can increase thermal resistance, thereby further reducing the heat transfer between the liquid medium and the pressure regulating control component 5. Preferably, the position of the necking area 10 on the extension piece 8 and / or the valve stem 6 is set so that the necking area 10 is located above the liquid level of the liquid medium in the extension chamber 7 when the pressure regulating valve is in use, so as to ensure that the necking area 10 has an effective heat-resisting effect. The closer the position of the necking area 10 on the extension piece 8 and / or the valve stem 6 is to the pressure regulating control component 5, the better.

[0076] At least one necking region 10 is provided on the extension member 8, so that the thermal resistance of the extension member 8 at the necking region 10 can be increased, thereby reducing the heat transfer between the liquid medium and the pressure regulating control component 5 along the extension member 8. The necking region 10 on the extension member 8 is preferably provided on the outer peripheral surface of the extension member 8.

[0077] At least one necking area 10 is provided on the valve stem 6, so that the thermal resistance of the valve stem 6 at the necking area 10 can be increased, thereby reducing the heat transfer between the liquid medium and the pressure regulating control component 5 along the valve stem 6. The necking area 10 on the valve stem 6 is preferably provided on the outer peripheral surface of the valve stem 6.

[0078] Preferably, at least one necking area 10 may be provided on both the extension piece 8 and the valve stem 6 .

[0079] Preferably, a heat dissipation structure is provided on the extension piece 8 and / or the valve stem 6. The heat dissipation structure is a structure having a heat dissipation function, and the specific form of the heat dissipation structure is not limited, for example, it can be a fin structure, a corrugated structure or a groove structure.

[0080] Providing a heat dissipation structure on the extension member 8 can increase the heat exchange between the extension member 8 and the outside world, so that the temperature of the medium in the extension chamber 7 can be increased. On the one hand, the heat transfer along the extension member 8 is reduced. On the other hand, the increase in the medium temperature in the extension chamber 7 will increase the proportion of the gas phase medium, which is more conducive to controlling the liquid phase medium level at a lower position, thereby further increasing the distance from the liquid phase medium serving as the cold source to the pressure regulating control component 5, and further reducing the heat transfer.

[0081] The heat dissipation structure is provided on the valve stem 6 , so as to improve the heat exchange between the valve stem 6 and the gaseous medium filled in the extended chamber 7 , thereby reducing the heat transfer along the valve stem 6 .

[0082] Preferably, a heat dissipation structure may be provided on both the extension member 8 and the valve stem 6 .

[0083] In the present embodiment, preferably, the extended chamber 7 is roughly in the shape of an elongated strip, and the elongated extended chamber 7 has a relatively small cross-sectional area and a relatively long extension length, which is conducive to the filled gas phase medium forming a gas phase layer with an effective thickness in the end of the extended chamber 7 away from the pressure sensing chamber, so as to ensure the effect of isolating the low temperature of the liquid phase medium and reducing heat transfer.

[0084] Preferably, a guide sleeve can be provided between the valve stem 6 and the extension piece 8, and the guide sleeve is preferably made of a polymer material. One of the valve stem 6 and the extension piece 8 is connected and fixed with the guide sleeve, preferably in an interference fit manner; the other of the valve stem 6 and the extension piece 8 is in a clearance fit with the guide sleeve. That is, the guide sleeve can be in an interference fit with the valve stem 6 and in a clearance fit with the extension piece 8, or the guide sleeve can be in an interference fit with the extension piece 8 and in a clearance fit with the valve stem 6. The guide sleeve can occupy the space of the extension chamber 7 between the valve stem 6 and the extension piece 8, further reducing the volume of the extension chamber 7 between the valve stem 6 and the extension piece 8, thereby increasing the thickness of the gas phase layer formed by the gas phase medium filling the extension chamber 7, and controlling the liquid phase medium level at a lower position, thereby further increasing the distance from the liquid phase medium as a cold source to the pressure regulating control assembly 5, and further reducing the heat transfer; at the same time, the guide sleeve can also guide the movement of the valve stem 6 in the extension chamber 7; at the same time, the thermal conductivity of the polymer material is poor, and the guide sleeve made of the polymer material can also play an effect of hindering heat transfer.

[0085] In this embodiment, preferably, the pressure regulating control assembly 5 includes a shell 51, a piston 52 and a first spring 53. The interior of the shell 51 is hollow, and the piston 52 is reciprocatingly disposed inside the shell 51, and the piston 52 divides the internal space of the shell 51 into a first chamber 511 and a second chamber 512. The first spring 53 is disposed in the first chamber 511, and the first spring 53 presses the piston 52 toward the second chamber 512. The shell 51 is provided with a breathing hole 513, and the breathing hole 513 connects the first chamber 511 with the outside of the shell 51, so that at least part of the pressure regulating control assembly (i.e., the first chamber 511) is always connected to the external environment. The second chamber 512 is connected to the extension chamber 7, and when the pressure regulating control assembly 5 drives the valve stem 6 to move, the valve stem 6 is connected or abutted against the piston 52.

[0086] Thus, when the pressure in the pressure sensing chamber is lower than the preset value, the first spring 53 overcomes the pressure in the pressure sensing chamber and pushes the piston 52 to move in the direction close to the pressure sensing chamber, and the piston 52 pushes the valve disc 4 away from the valve seat 3 through the valve stem 6, so that the pressure regulating valve is opened. When the pressure in the pressure sensing chamber is higher than the preset value, the piston 52 overcomes the pressure of the first spring 53 under the action of the pressure in the pressure sensing chamber and moves in the direction away from the pressure sensing chamber, and the pressure of the piston 52 on the valve disc 4 through the valve stem 6 disappears, and the valve disc 4 approaches and is pressed against the valve seat 3, so that the pressure regulating valve is closed.

[0087] When the pressure regulating control assembly 5 drives the valve stem 6 to move to open the pressure regulating valve, the valve stem 6 and the piston 52 can be connected and fixed. Then, during the closing process of the pressure regulating valve, the piston 52 moves synchronously with the valve stem 6 in a direction away from the pressure sensing chamber, so that the resistance of the valve disc 4 to the movement of the valve seat 3 is smaller.

[0088] When the pressure regulating control component 5 drives the valve stem 6 to move to open the pressure regulating valve, the valve stem 6 and the piston 52 may also be in contact with each other. The two are not fixed to each other and are arranged separately. Then, during the closing process of the pressure regulating valve, the piston 52 does not drive the valve stem 6 when it moves away from the pressure sensing chamber, and the valve disc 4 pushes the valve stem 6 to move when it moves toward the valve seat 3. During this process, the piston 52 and the valve stem 6 may be separated from each other at some time, or they may always maintain contact with each other. Through such an arrangement, the processing accuracy requirements of the valve stem 6 can be reduced.

[0089] Further, in the present embodiment, preferably, the piston 52 comprises a first piston 521, a second piston 522, a sealing ring 523 and a sealing ring 524. The first piston 521 is close to the first chamber 511, and the first spring 53 abuts against the first piston 521. The second piston 522 is close to the second chamber 512, and the second piston 522 is connected to or abuts against the valve stem 6. The sealing ring 523 is arranged between the first piston 521 and the housing 51 to achieve the sealing between the first piston 521 and the housing 51. The sealing ring 524 is pressed between the first piston 521, the second piston 522 and the housing 51 to achieve the sealing between the first piston 521, the second piston 522 and the housing 51. The sealing ring 524 achieves the sealing between the piston 52 as a whole and the housing 51, prevents the moisture in the first chamber 511 from entering the second chamber 512 and entering the extension chamber 7, and prevents the medium in the extension chamber 7 from leaking. The sealing ring 523 between the first piston 521 and the housing 51 can further prevent the moisture in the first chamber 511 from entering the interior of the piston 52. In this embodiment, the sealing ring 523 is preferably a rubber O-type sealing ring, and the sealing ring 524 is preferably made of a polymer filler, and the polymer filler is preferably a polytetrafluoroethylene filler. Since the sealing ring 524 is closer to the cold source, the use of a polymer filler can obtain better low-temperature performance, and the temperature at the sealing ring 523 is closer to the external ambient temperature, and the rubber O-type sealing ring has better elasticity at room temperature. Such a setting can better ensure the sealing between the first piston 521 and the housing 51, and better control the resistance to the movement of the piston 52.

[0090] Preferably, the sealing ring 524 includes a first sealing ring 524a and a second sealing ring 524b which are in contact with each other, the first sealing ring 524a contacts the first piston 521 and the housing 51, the second sealing ring 524b contacts the second piston 522 and the housing 51, and the contact surface between the first sealing ring 524a and the second sealing ring 524b is a conical surface. The first sealing ring 524a and the second sealing ring 524b are both made of polymer fillers. Thus, under the action of axial pressure (the pressure of the first spring 53 or the pressure of the pressure sensing chamber), the first sealing ring 524a and the second sealing ring 524b will have a tendency to slide relative to each other along the conical contact surface, thereby generating a greater radial sealing force, and achieving a better sealing effect at low temperatures.

[0091] Preferably, a gap is formed between the first piston 521 and the second piston 522, thereby reducing the heat transfer between the first piston 521 and the second piston 522, thereby further reducing the risk of freezing of the first piston 521 close to the first chamber 511 due to direct contact with the air in the first chamber 511, and also reducing the risk of failure of the sealing ring 523 between the first piston 521 and the housing 51 due to contact with low temperature, further reducing the possibility of moisture in the first chamber 511 entering the interior of the piston 52. More preferably, the first piston 521 and the second piston 522 do not contact each other, which can further reduce the heat transfer between the first piston 521 and the second piston 522 due to mutual contact.

[0092] In this embodiment, an annular protrusion is provided on the outer peripheral edge of one side of the first piston 521 facing the second piston 522, and the second piston 522 sinks toward the outer peripheral edge of one side of the first piston 521 to form a central circular boss, and the sealing ring 524 is sleeved on the circular boss of the second piston 522, and the annular protrusion of the first piston 521 is pressed tightly on the sealing ring 524, and the size relationship of the circular boss of the second piston 522, the annular protrusion of the first piston 521 and the sealing ring 524 satisfies: when the annular protrusion of the first piston 521 presses the sealing ring 524 with a preset pressure (the sealing ring 524 is deformed to a certain extent), the circular boss of the second piston 522 does not contact the first piston 521, but there is a gap. The preset pressure of the annular protrusion of the first piston 521 is provided by the pressure of the first spring 53 and the pressure in the non-pressure sensing chamber when the pressure regulating valve is closed. The gap between the circular boss of the second piston 522 and the first piston 521 should be slightly larger than the maximum compression amount of the sealing ring 524, so as to ensure that a gap is always formed between the first piston 521 and the second piston 522 during use of the pressure regulating valve.

[0093] In this embodiment, the pressure regulating control component 5 adopts a piston 52 structure, which has more advantages in optimizing the heat transfer inside the pressure regulating valve and can obtain a larger maximum opening. However, under specific working conditions, only the extended chamber 7 can play a good role in preventing ice formation. Therefore, the piston 52 structure in the pressure regulating control component 5 can also be replaced by a diaphragm, bellows and other structures in the prior art.

[0094] In this embodiment, if Figure 2As shown, the pressure regulating control component 5 is connected to the outlet chamber 2 through the extension chamber 7, and the pressure regulating control component 5 responds according to the pressure in the outlet chamber 2, that is, the outlet chamber 2 serves as a pressure sensing chamber and the inlet chamber 1 serves as a non-pressure sensing chamber. In other embodiments, according to different actual needs, the pressure regulating control component 5 can also be connected to different pressure sensing chambers, for example, the inlet chamber 1 serves as a pressure sensing chamber and the outlet chamber 2 serves as a non-pressure sensing chamber, and the pressure regulating control component 5 is connected to the inlet chamber 1, so as to respond according to the pressure in the inlet chamber 1, that is, when the pressure in the inlet chamber 1 is lower than or higher than the preset pressure, the pressure regulating control component 5 controls the inlet chamber 1 to be connected or disconnected from the outlet chamber 2. In addition, the logic of the pressure regulating control component 5 driving the valve stem 6 to move in response to the pressure change in the pressure sensing chamber to control the opening and closing of the pressure regulating valve can also be set according to actual use requirements and in combination with the structures of different pressure regulating valves in the prior art. For example, the pressure regulating control component 5 can be configured to open the pressure regulating valve when the pressure in the pressure sensing chamber is lower than the preset pressure, or can be configured to close the pressure regulating valve when the pressure in the pressure sensing chamber is higher than the preset pressure. Regardless of how the logic of the valve opening and closing is set, as long as the pressure regulating control component 5 is connected to the pressure sensing chamber through the extension chamber 7, the effect of optimizing heat transfer can be achieved.

[0095] In this embodiment, preferably, the valve flap 4 includes a sealing portion 41 and a rod portion 42, the rod portion 42 is fixed on the sealing portion 41, the sealing portion 41 is arranged opposite to the valve seat 3 on the side of the valve seat 3 away from the pressure sensing chamber, the rod portion 42 is located in the pressure sensing chamber, and the end of the valve stem 6 close to the valve flap 4 is connected to the end of the rod portion 42 away from the sealing portion 41, or, when the valve stem 6 acts on the valve flap 4, the end of the valve stem 6 close to the valve flap 4 abuts against the end of the rod portion 42 away from the sealing portion 41. Then, the valve stem 6 acts on the sealing portion 41 through the rod portion 42, so that the sealing portion 41 approaches or moves away from the valve seat 3, and when the sealing portion 41 approaches the valve seat 3 and contacts the valve seat 3, the valve flap 4 closes the valve seat 3, and the pressure regulating valve is closed. When the sealing portion 41 moves away from the valve seat 3 and separates from the valve seat 3, the valve flap 4 opens the valve seat 3, and the pressure regulating valve is opened.

[0096] Preferably, when the valve stem 6 acts on the valve disc 4, the end of the valve stem 6 close to the valve disc 4 and the end of the rod 42 away from the sealing portion 41 can be in contact with each other, and the two are not fixed and are arranged separately. The valve stem 6 and the rod 42 of the valve disc 4 are arranged separately, which can reduce the length of the valve stem 6 and facilitate the processing of the valve stem 6. In addition, when the valve stem 6 is connected and fixed with the pressure regulating control assembly 5, specifically, the valve stem 6 is connected and fixed with the piston 52, during the closing process of the pressure regulating valve, the piston 52 moves synchronously with the valve stem 6 in the direction away from the pressure sensing chamber, so that the valve disc 4 can move toward the valve seat 3 by overcoming the gravity of the valve disc 4 itself, which is more conducive to the closing response of the pressure regulating valve. When the valve stem 6 is in contact with the piston 52, the two ends of the valve stem 6 are not fixed with the piston 52 and the rod 42 of the valve disc 4, which can reduce the processing accuracy requirements of the valve stem 6. At this time, the valve stem 6 can be limited and guided by the guide sleeve arranged between the valve stem 6 and the extension 8.

[0097] The end of the valve stem 6 close to the valve disc 4 and the end of the rod 42 away from the sealing portion 41 can also be connected and fixed. In this case, when the valve stem 6 and the piston 52 are connected and fixed, during the closing process of the pressure regulating valve, the piston 52 moves synchronously with the valve stem 6 in the direction away from the pressure sensing chamber, and the valve stem 6 moves the valve disc 4 toward the valve seat 3, so that the resistance to the movement of the valve disc 4 toward the valve seat 3 is smaller.

[0098] Preferably, the end of the stem 42 of the valve flap 4 away from the sealing portion 41 extends into the extended chamber 7, and the end of the valve stem 6 close to the valve flap 4 is also located in the extended chamber 7. The stem 42 of the valve flap 4 passes through the valve body 9 from the pressure sensing chamber and extends into the extended chamber 7, and the clearance between the stem 42 of the valve flap 4 and the valve body 9 is matched, so that the pressure sensing chamber is connected to the extended chamber 7, and the movement of the stem 42 of the valve flap 4 can be guided by the valve body 9.

[0099] In this embodiment, preferably, a second spring 11 is provided on the side of the sealing portion 41 of the valve flap 4 away from the valve seat 3, and the second spring 11 presses the sealing portion 41 against the valve seat 3. In the process of closing the pressure regulating valve, the pressure of the second spring 11 acts on the sealing portion 41 of the valve flap 4 to press the sealing portion 41 against the valve seat 3; in the process of opening the pressure regulating valve, the pressure regulating control component 5 acts on the valve flap 4 through the valve stem 6 and needs to overcome the pressure of the second spring 11 to push the valve flap 4 away from the valve seat 3. Preferably, the second spring 11 can be arranged in a spring chamber 12 connected to the end of the non-pressure sensing chamber close to the valve seat 3.

[0100] In other embodiments, in order to meet the pressure regulation requirements under different working conditions, the valve flap 4 can also be driven in other ways to produce a tendency to move toward the valve seat 3. For example, under the working condition where the pressure difference between the pressure sensing chamber and the non-pressure sensing chamber is large enough, the valve flap 4 can be set to move toward the valve seat 3 under the action of the pressure of the non-pressure sensing chamber; the valve flap 4 can also be connected to the valve stem 6, and the valve stem 6 directly drives the valve flap 4 to move under the drive of the pressure regulation control component 5.

[0101] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A pressure regulating valve, characterized in that: include: An inlet chamber (1) and an outlet chamber (2) for the circulation of a liquid medium, wherein one of the inlet chamber (1) and the outlet chamber (2) serves as a pressure sensing chamber; A valve seat (3) and a valve flap (4) arranged between the inlet chamber (1) and the outlet chamber (2); A pressure regulating control assembly (5) acts on the valve flap (4) through a valve stem (6) to make the valve flap (4) approach or move away from the valve seat (3) so as to isolate or connect the inlet chamber (1) with the outlet chamber (2); An extended chamber (7) extends from the pressure sensing chamber along the axial direction of the valve stem (6) and is connected to the pressure regulating control component (5). One end of the extended chamber (7) away from the pressure sensing chamber serves as a gas phase containing portion. When in use, the gas phase containing portion is filled with a gas phase medium generated by the liquid phase medium in the pressure sensing chamber being heated and vaporized. The valve stem (6) is movably arranged in the extended chamber (7). The pressure regulating control component (5) is at least partially connected to the external environment at all times. The pressure regulating control component (5) is configured to drive the valve stem (6) to move in response to pressure changes in the pressure sensing chamber.

2. The pressure regulating valve according to claim 1, characterized in that: The extension chamber (7) is formed inside the extension piece (8), and a necking area (10) is provided on the extension piece (8) and / or the valve stem (6).

3. The pressure regulating valve according to claim 2, characterized in that: The position of the necking area (10) on the extension piece (8) and / or the valve stem (6) is set so that when the pressure regulating valve is in use, the necking area (10) is located above the liquid level of the liquid medium in the extension chamber (7).

4. The pressure regulating valve according to claim 1, characterized in that: The extension chamber (7) is formed inside the extension piece (8), and a heat dissipation structure is provided on the extension piece (8) and / or the valve stem (6).

5. The pressure regulating valve according to claim 1, characterized in that: The extension chamber (7) is formed inside the extension piece (8), a guide sleeve is provided between the valve stem (6) and the extension piece (8), one of the valve stem (6) and the extension piece (8) is connected to the guide sleeve, and the other of the valve stem (6) and the extension piece (8) is clearance-matched with the guide sleeve.

6. The pressure regulating valve according to claim 1, characterized in that: The pressure regulating control assembly (5) comprises a housing (51), a piston (52) and a first spring (53); the housing (51) is hollow inside; the piston (52) is reciprocatingly arranged inside the housing (51) and divides the internal space of the housing (51) into a first chamber (511) and a second chamber (512); the first spring (53) is arranged in the first chamber (511) and presses the piston (52) toward the second chamber (512); the housing (51) is provided with a breathing hole (513) connecting the first chamber (511) and the outside of the housing (51); the second chamber (512) is connected to the extension chamber (7); when the pressure regulating control assembly (5) drives the valve stem (6) to move, the valve stem (6) is connected to or abuts against the piston (52).

7. The pressure regulating valve according to claim 6, characterized in that: The piston (52) includes a first piston (521) close to the first chamber (511), a second piston (522) close to the second chamber (512), a sealing ring (523) provided between the first piston (521) and the housing (51), and a sealing ring (524) compressed between the first piston (521), the second piston (522) and the housing (51).

8. The pressure regulating valve according to claim 7, characterized in that: A gap is formed between the first piston (521) and the second piston (522).

9. The pressure regulating valve according to claim 8, characterized in that: The first piston (521) and the second piston (522) do not contact each other.

10. The pressure regulating valve according to claim 7, characterized in that: The sealing ring (524) includes a first sealing ring (524a) and a second sealing ring (524b) that are in contact with each other, the first sealing ring (524a) is in contact with the first piston (521) and the housing (51), the second sealing ring (524b) is in contact with the second piston (522) and the housing (51), and the contact surface between the first sealing ring (524a) and the second sealing ring (524b) is a conical surface.

11. The pressure regulating valve according to claim 1, characterized in that: The valve flap (4) comprises a sealing portion (41) and a rod portion (42) arranged on the sealing portion (41); the sealing portion (41) is arranged opposite to the valve seat (3) on a side of the valve seat (3) away from the pressure sensing chamber; the rod portion (42) is located in the pressure sensing chamber; the valve stem (6) is connected to the pressure regulating control component (5); and when the valve stem (6) acts on the valve flap (4), an end of the valve stem (6) close to the valve flap (4) abuts against an end of the rod portion (42) away from the sealing portion (41); a second spring (11) is provided on a side of the sealing portion (41) away from the valve seat (3); the second spring (11) presses the sealing portion (41) toward the valve seat (3).

12. The pressure regulating valve according to claim 11, characterized in that: One end of the rod portion (42) away from the sealing portion (41) extends into the extension chamber (7).

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