Drain valve

Abstract

The invention provides a drain valve, comprising: a valve body comprising a circulation channel, a first opening and a first mounting port which are communicated in sequence, the first mounting port being located on the outer side of the circulation channel; the valve element component is movably arranged in the circulation channel, and a blocking part of the valve element component can block or open the first opening; the first driving piece and the second driving piece are arranged in the circulation channel and the first mounting opening correspondingly, the first driving piece and the second driving piece are in driving connection with the valve element component correspondingly and located on the two sides of the plugging part correspondingly in the moving direction of the valve element component, the first driving piece can sense the temperature in the circulation channel, and the second driving piece can sense the temperature in the circulation channel. The second driving piece can sense the temperature of the first mounting opening; wherein the first driving piece can extend or shorten along with the change of the temperature, the second driving piece can extend or shorten along with the change of the temperature, and the first driving piece and the second driving piece are matched to drive the valve element component to move, so that the blocking part blocks or opens the first opening.

Description

Technical Field

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

[0002] The drain valve generally includes a valve body, a valve core component and a drive member, wherein the valve body is provided with an opening and a circulation channel that are interconnected, the end of the valve core component is provided corresponding to the opening, and the valve core component is movably provided in the circulation channel to block or open the opening. The drive member is provided in the circulation channel, and as the temperature changes, the drive member can deform and drive the valve core component to move so that the valve core component opens or closes the opening. Specifically, when the temperature of the fluid drops to a temperature close to freezing, the drive member deforms and drives the valve core component to move to open the opening to prevent the drain valve from freezing and cracking.

[0003] The driver is set in the circulation channel, and it can only sense the temperature of the fluid in the circulation channel. When the ambient temperature is not lower than the freezing temperature of the fluid, and the fluid temperature is close to the freezing temperature, there is no need to open the valve for anti-freezing. However, with the above solution, since the driver has sensed that the temperature of the fluid is close to the freezing temperature, the driver will deform. When the driver is deformed, the driver will drive the valve core component to move and open the opening, which may cause the risk of accidental valve opening. Summary of the invention

[0004] The present invention provides a drain valve to solve the problem in the prior art that when the ambient temperature is not lower than the freezing temperature of the fluid and the fluid temperature is close to the freezing temperature, the drain valve may have the risk of accidentally opening the valve.

[0005] The present invention provides a drain valve, which includes: a valve body, including a circulation channel, a first opening and a first mounting port, the first mounting port is located on the outside of the circulation channel, and the two ends of the first opening are respectively connected to the circulation channel and the first mounting port; a valve core component is movably arranged in the circulation channel, the valve core component has a blocking portion, the blocking portion is arranged corresponding to the first opening, and the blocking portion can block or open the first opening; a first driving member and a second driving member are respectively arranged in the circulation channel and the first mounting port, the first driving member and the second driving member are respectively connected to the valve core component for driving, along the moving direction of the valve core component, the first driving member and the second driving member are respectively located on both sides of the blocking portion, the first driving member can sense the temperature in the circulation channel, and the second driving member can sense the temperature at the first mounting port; wherein the first driving member can extend or shorten with the change of temperature, and the second driving member can extend or shorten with the change of temperature, and the first driving member and the second driving member cooperate to drive the valve core component to move so that the blocking portion blocks or opens the first opening.

[0006] Further, when the temperature in the circulation channel is lower than the first preset temperature and the temperature at the first mounting port is lower than the second preset temperature, the first driving member extends and the second driving member shortens, and the first driving member and the second driving member drive the blocking portion to open the first opening; or, when the temperature in the circulation channel is lower than the first preset temperature and the temperature at the first mounting port is lower than the second preset temperature, the first driving member shortens and the second driving member extends, and the first driving member and the second driving member drive the blocking portion to open the first opening.

[0007] Further, when the temperature in the circulation channel is not lower than the first preset temperature or the temperature at the first installation port is not lower than the second preset temperature, the blocking portion blocks the first opening.

[0008] Furthermore, the drain valve also includes: a guide member, which is located in the first installation opening, and the guide member is arranged between the second driving member and the valve body, and the guide member can cooperate with the second driving member in a guiding manner.

[0009] Furthermore, the guide member includes a guide portion and a connecting portion that are connected to each other. The guide portion is sleeved on the outside of the second driving member and cooperates with the guide of the second driving member. The connecting portion is located at one end of the second driving member close to the valve core component. The connecting portion includes a first connecting end and a second connecting end that are relatively arranged along the axial direction of the guide portion. The first connecting end is connected to the guide portion, and the second connecting end abuts against the valve core component. One end of the second driving member close to the valve core component is connected to at least one of the guide portion and the connecting portion.

[0010] Furthermore, the second connecting end is connected to the end face of the sealing part, and the drain valve also includes: a positioning structure, which is arranged between the sealing part and the second connecting end, and the positioning structure is used to limit the position between the second connecting end and the end face of the sealing part of the valve core component.

[0011] Furthermore, along the axial direction of the first mounting port, a first limiting portion and a second limiting portion are spaced apart in the first mounting port, and the guide member is located between the first limiting portion and the second limiting portion. Both ends of the guide member can respectively cooperate with the first limiting portion and the second limiting portion to limit the moving stroke of the guide member.

[0012] Furthermore, the first mounting port is coaxially arranged with the first opening, and the diameter of the first mounting port is larger than the diameter of the first opening, and the end face of one end of the first mounting port connected to the first opening forms a first limiting portion; the drain valve also includes a gasket, which is arranged at the end of the first mounting port away from the first opening, and the gasket forms a second limiting portion; wherein, the end face of one end of the first mounting port connected to the first opening is limitedly matched with the end face of one end of the guide member, and the gasket is limitedly matched with the end face of the other end of the guide member.

[0013] Furthermore, the valve body includes: a main body portion, which is provided with a circulation channel, and a second mounting port is also provided on the main body portion, and the second mounting port is connected to the circulation channel; a valve seat, which is provided with a first opening and a first mounting port that are connected to each other, and the valve seat is arranged at the second mounting port, and the first opening is connected to the circulation channel.

[0014] Furthermore, the first opening is arranged on the side wall of the circulation channel, and the valve body is also provided with a second opening, which is arranged on the side wall of the circulation channel and opposite to the first opening, and the end of the valve core component away from the blocking portion is arranged corresponding to the second opening.

[0015] By applying the technical solution of the present invention, the lengths of the first driving member and the second driving member can both change with the temperature. The first driving member and the second driving member are respectively arranged in the circulation channel and at the first installation port located outside the circulation channel, which can reduce the situation of valve opening when the ambient temperature is low but the fluid temperature is high, and can also reduce the situation of valve opening when the fluid temperature is low but the ambient temperature is high, that is, reduce the situation of accidental drainage. Specifically, when the first opening is in a blocked state, fluid passes through the circulation channel, the first driving member senses the temperature of the fluid in the circulation channel, and the second driving member senses the ambient temperature at the first installation port. When the fluid temperature is lower than the first preset temperature and the ambient temperature is lower than the second preset temperature, the first driving member and the second driving member extend or shorten to open the valve. Only when the fluid temperature is lower than the first preset temperature but the ambient temperature is not lower than the second preset temperature, only the elastic force of the first driving member changes, and the elastic force of the second driving member remains unchanged; similarly, only when the ambient temperature is lower than the second preset temperature but the fluid temperature in the circulation channel is not lower than the first preset temperature, only the elastic force of the second driving member changes, and the elastic force of the first driving member does not change. When only the elastic force of the first driving member changes or only the elastic force of the second driving member changes, the driving force at this time is not enough to move the valve core component, that is, the first opening is still in a closed state, reducing or avoiding the occurrence of accidental drainage. In the traditional technical solution, no matter what the ambient temperature is, as long as the temperature of the fluid is lower than the valve opening temperature, the driving member arranged in the circulation channel drives the valve core component to move, which is very likely to cause accidental drainage. The arrangement of this solution enables the first driving member and the second driving member to sense the temperature of the fluid in the circulation channel and the ambient temperature respectively, and only when the temperature of the fluid in the circulation channel is lower than the first preset temperature and the ambient temperature is lower than the second preset temperature, the elastic forces of the first driving member and the second driving member change at the same time, and at this time the first driving member and the second driving member can be deformed at the same time to drive the valve core component to move. When only the first driving member or only the second driving member is deformed, the valve core component does not move to reduce the risk of accidental valve opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram showing the structure of the drain valve provided in the first embodiment of the present invention when it is in a blocked state;

[0018] Figure 2 A schematic diagram showing the structure of the drain valve provided in the first embodiment of the present invention when it is in an open state;

[0019] Figure 3 A schematic structural diagram of a valve body of a drain valve provided in Embodiment 1 of the present invention is shown;

[0020] Figure 4 A cross-sectional view of the drain valve provided by the first embodiment of the present invention when in a blocked state is shown;

[0021] Figure 5 A cross-sectional view of a drain valve provided in the first embodiment of the present invention when in an open state is shown;

[0022] Figure 6 Shows Figure 5 Schematic diagram of the local structure at A in the middle;

[0023] Figure 7 A schematic structural diagram of a guide member provided in Embodiment 1 of the present invention is shown;

[0024] Figure 8 A cross-sectional view of a guide member provided in Embodiment 1 of the present invention is shown;

[0025] Fig. 9 A top view of a guide member provided in Embodiment 1 of the present invention is shown;

[0026] Fig.10 A schematic diagram of the structure of the valve core component and the first driving component provided by the first embodiment of the present invention is shown;

[0027] Fig.11 A schematic diagram showing the structure of the drain valve provided in the second embodiment of the present invention when it is in a blocked state;

[0028] Fig.12 A schematic diagram showing the structure of the drain valve provided in the second embodiment of the present invention when it is in an open state.

[0029] The above drawings include the following reference numerals:

[0030] 10. Valve body;

[0031] 101, circulation channel; 102, first opening; 103, first mounting opening; 104, second opening;

[0032] 11. Main body; 1101. Second mounting opening; 1102. Second avoidance groove;

[0033] 12. valve seat; 121. first avoidance groove;

[0034] 20. Valve core parts;

[0035] 21. Sealing part; 22. Valve stem;

[0036] 30. First driving member; 31. First guide section; 32. Second guide section;

[0037] 40. A second driving member;

[0038] 50. Guide member;

[0039] 51. Guide part;

[0040] 52, connecting portion; 521, first connecting end; 522, second connecting end;

[0041] 60. Positioning structure;

[0042] 61. positioning groove; 62. positioning protrusion;

[0043] 71. A first limiting portion; 72. A second limiting portion. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] like Figures 1 to 10As shown, the first embodiment of the present invention provides a drain valve, which includes a valve body 10, a valve core component 20, a first driving member 30 and a second driving member 40. The valve body 10 includes a circulation channel 101, a first opening 102 and a first mounting port 103. The first mounting port 103 is located outside the circulation channel 101, and both ends of the first opening 102 are respectively connected to the circulation channel 101 and the first mounting port 103. The valve core component 20 is movably arranged in the circulation channel 101, and the valve core component 20 has a blocking portion 21. The blocking portion 21 is arranged corresponding to the first opening 102, and the blocking portion 21 can block or open the first opening 102. The first driving member 30 and the second driving member 40 are respectively arranged in the circulation channel 101 and the first installation port 103, and the first driving member 30 and the second driving member 40 are respectively connected to the valve core component 20 for driving. Along the moving direction of the valve core component 20, the first driving member 30 and the second driving member 40 are respectively located on both sides of the blocking portion 21, and the first driving member 30 can sense the temperature in the circulation channel 101, and the second driving member 40 can sense the temperature at the first installation port 103; wherein, the first driving member 30 can extend or shorten with the change of temperature, and the second driving member 40 can extend or shorten with the change of temperature, and the first driving member 30 and the second driving member 40 cooperate to drive the valve core component 20 to move, so that the blocking portion 21 blocks or opens the first opening 102.

[0046] By applying the technical solution of the present invention, the lengths of the first driving member 30 and the second driving member 40 can both change with temperature. The first driving member 30 and the second driving member 40 are respectively arranged in the circulation channel 101 and at the first mounting port 103 located outside the circulation channel 101, which can reduce the situation of valve opening when the ambient temperature is low but the fluid temperature is high, and can also reduce the situation of valve opening when the fluid temperature is low but the ambient temperature is high, that is, reduce the situation of accidental drainage. Specifically, when the first opening 102 is in a blocked state, fluid passes through the circulation channel 101, the first driving member 30 senses the temperature of the fluid in the circulation channel 101, and the second driving member 40 senses the ambient temperature at the first mounting port 103. When the fluid temperature is lower than the first preset temperature and the ambient temperature is lower than the second preset temperature, the first driving member 30 and the second driving member 40 extend or shorten to open the valve. Only when the fluid temperature is lower than the first preset temperature but the ambient temperature is not lower than the second preset temperature, only the elastic force of the first driving member 30 changes, and the elastic force of the second driving member 40 remains unchanged; similarly, only when the ambient temperature is lower than the second preset temperature but the fluid temperature in the circulation channel 101 is not lower than the first preset temperature, only the elastic force of the second driving member 40 changes, and the elastic force of the first driving member 30 does not change. When only the elastic force of the first driving member 30 changes or only the elastic force of the second driving member 40 changes, the driving force at this time is not enough to move the valve core component 20, that is, the first opening 102 is still in a closed state, reducing or avoiding the occurrence of accidental drainage. In the traditional technical solution, regardless of the ambient temperature, as long as the temperature of the fluid is lower than the valve opening temperature, the driving member arranged in the circulation channel drives the valve core component to move, which is very likely to cause accidental drainage. The arrangement of this solution enables the first driving member 30 and the second driving member 40 to sense the temperature of the fluid in the circulation channel 101 and the ambient temperature respectively, and only when the temperature of the fluid in the circulation channel 101 is lower than the first preset temperature and the ambient temperature is lower than the second preset temperature, the elastic forces of the first driving member 30 and the second driving member 40 change simultaneously, and at this time, the first driving member 30 and the second driving member 40 can be deformed simultaneously to drive the valve core component 20 to move. When only the first driving member 30 or only the second driving member 40 is deformed, the valve core component 20 does not move to reduce the risk of accidental valve opening.

[0047] This solution does not limit the length change of the first driving member 30 and the second driving member 40 when the temperature changes, and does not limit the specific form of the first driving member 30 and the second driving member 40. Among them, the first driving member 30 and the second driving member 40 can be set as a temperature-sensitive material, which can be a temperature bag or a memory alloy material. In this embodiment, the first driving member 30 is a first memory alloy spring, and the second driving member 40 is a second memory alloy spring.

[0048] like Figures 3 to 5As shown, specifically, when the temperature in the circulation channel 101 is lower than the first preset temperature, and the temperature at the first mounting port 103 is lower than the second preset temperature, the first driving member 30 shortens, and the second driving member 40 lengthens, and the first driving member 30 and the second driving member 40 drive the blocking portion 21 to open the first opening 102. In this solution, the first preset temperature is the same as the second preset temperature. And when the valve core component 20 opens the first opening 102, the blocking portion 21 of the valve core component 20 moves toward the circulation channel 101.

[0049] In this embodiment, the first preset temperature and the second preset temperature are both 3°C.

[0050] When the fluid temperature in the circulation channel 101 and the ambient temperature at the first installation port 103 are both reduced to below 3°C, the elastic force of the first memory alloy spring decreases, the first memory alloy spring shortens, and the elastic force of the second memory alloy spring increases, the second memory alloy spring extends, to open the valve.

[0051] When the fluid temperature in the circulation channel 101 and the ambient temperature at the first installation port 103 are not lower than 3°C, the elastic force of the first memory alloy spring increases, the first memory alloy spring stretches, the elastic force of the second memory alloy spring decreases, and the second memory alloy spring shortens to achieve valve closing.

[0052] Further, when the temperature in the circulation channel 101 is below 3°C and the temperature at the first installation port 103 is not lower than 3°C, the valve core component 20 does not move, and the valve core component 20 blocks the first opening 102; when the temperature in the circulation channel 101 is not lower than 3°C, and the temperature at the first installation port 103 is below 3°C, the valve core component 20 does not move, and the valve core component 20 blocks the first opening 102.

[0053] Specifically, in this embodiment, when the fluid temperature is lower than 3°C, but the air temperature is still at 3°C ​​or even higher, the actual use condition at this time is the local low-temperature water that occurs during summer refrigeration, but the ambient temperature is high and there is no risk of freezing. In actual use, it is not desirable to open the drain valve. At this time, the elastic force of the first memory alloy spring becomes smaller, but because the temperature at the first installation port 103 is not lower than 3°C, the elastic force of the second memory alloy spring does not increase at this time, and is still in a state of relatively small elastic force. In addition, the design can ensure that the elastic force of the first memory alloy spring is still greater than that of the second memory alloy spring, and the valve core component 20 can be ensured to remain stationary at this time. At this time, the valve core component 20 still remains in a closed valve state, and there will be no accidental drainage.

[0054] When the fluid temperature is still at 3°C ​​or even higher, but the air temperature is lower than 3°C, it is not desirable to open the drain valve in actual use. At this time, the first memory alloy spring is still in an extended state, maintaining a relatively large elastic force, and the air temperature reaches the phase transition temperature of the second memory alloy spring, the elastic force of the second memory alloy spring increases, and the second memory alloy spring is in a relatively large elastic force state. The design can ensure that the elastic force of the first memory alloy spring is equal to the elastic force of the second memory alloy spring, or the first memory alloy spring force is slightly greater than the second memory alloy spring force, so as to ensure that the first opening 102 will not be opened at this time.

[0055] Only when the fluid temperature and the ambient temperature are both below 3°C, or lower, the first memory alloy spring force becomes smaller and the second memory alloy spring force becomes larger, and the valve core component 20 will open the first opening 102 under the combined spring force of the first memory alloy spring and the second memory alloy spring.

[0056] If the first opening 102 is in an open state and the fluid in the drain valve has been drained, the first memory alloy spring and the second memory alloy spring both sense the air temperature. If the ambient temperature is below 3°C, the valve remains open. If the ambient temperature is above 3°C, the first memory alloy spring and the second memory alloy spring both sense the ambient temperature and close the first opening 102.

[0057] If water with a temperature not lower than 3°C is introduced in a low temperature environment, the first opening 102 is initially in an open state. When water flows through the first memory alloy spring and the second memory alloy spring, the elastic force of the second memory alloy spring decreases, while the elastic force of the first memory alloy spring increases. The elastic force of the second memory alloy spring is smaller than the elastic force of the first memory alloy spring, so that the second memory alloy spring shortens and the first memory alloy spring lengthens, thereby closing the valve. Therefore, the valve closing logic meets the actual use conditions.

[0058] like Figures 3 to 5 As shown, the drain valve further includes a guide member 50. The guide member 50 is located in the first installation opening 103, and the guide member 50 is arranged between the second driving member 40 and the valve body 10, and the guide member 50 can cooperate with the second driving member 40 in a guiding manner. The arrangement of the guide member 50 can guide the extension and retraction process of the second driving member 40, improve the smoothness and stability of the extension and retraction process of the second driving member 40, improve the stability of the second driving member 40 driving the valve core component 20, and thus improve the stability when the first opening 102 is opened.

[0059] like Figures 4 to 9As shown, specifically, the guide member 50 includes a guide portion 51 and a connecting portion 52 connected to each other, the guide portion 51 is sleeved on the outer side of the second driving member 40 and cooperates with the second driving member 40 in a guiding manner, the connecting portion 52 is located at one end of the second driving member 40 close to the valve core component 20, the connecting portion 52 includes a first connecting end 521 and a second connecting end 522 arranged opposite to each other along the axial direction of the guide portion 51, the first connecting end 521 is connected to the guide portion 51, the second connecting end 522 abuts against the valve core component 20, and one end of the second driving member 40 close to the valve core component 20 is connected to at least one of the guide portion 51 and the connecting portion 52. In this embodiment, the above arrangement enables the valve core component 20 and the second memory alloy spring to transmit the force through the guide member 50, and the diameter of the second memory alloy spring can be adaptively increased according to the actual working conditions to ensure the spring force of the second memory alloy spring.

[0060] In this embodiment, the connecting portion 52 includes a connecting rod and a connecting plate connected in sequence along the axial direction, the connecting plate forming a first connecting end 521, and the connecting rod forming a second connecting end 522. The axial direction of the connecting rod is the same as the axial direction of the guide portion 51, the connecting plate is a circular plate-like structure, the connecting plate is perpendicular to the connecting rod, and the connecting plate is connected to one end of the connecting rod close to the second memory alloy spring, and the connecting plate is connected to the inner side wall of the guide portion 51. A plurality of flow holes are arranged on the connecting plate, and the plurality of flow holes are arranged at annular intervals along the circumference of the connecting rod on the outer periphery of the connecting rod, and the total flow area of ​​the plurality of flow holes is greater than the flow area of ​​the first opening 102, so as to avoid throttling and ensure the smoothness of fluid discharge.

[0061] Furthermore, in this embodiment, the end surface of the second memory alloy spring close to the connecting plate abuts against the end surface of the connecting plate close to the second memory alloy spring. This arrangement can ensure the contact area between the second memory alloy spring and the guide member 50, and further improve the stability of the abutment between the memory alloy spring and the connecting plate.

[0062] In this embodiment, when the valve core component 20 opens the first opening, the blocking portion 21 moves toward the flow channel 101, and the end of the connecting rod away from the connecting plate abuts against the end surface of the blocking portion 21. The length of the connecting rod is greater than the depth of the first opening 102, the diameter of the connecting rod is smaller than the diameter of the first opening 102, and the end surface of the connecting rod away from the connecting plate protrudes from the end surface of the guide portion 51 close to the valve core component 20. In this way, when the valve core component 20 opens the first opening 102, the connecting rod can extend into the first opening 102 to ensure that the guide member 50 always moves synchronously with the valve core component 20 during the movement of the valve core component 20.

[0063] Furthermore, the drain valve also includes a positioning structure 60. The positioning structure 60 is arranged between the blocking portion 21 and the second connecting end 522, and the positioning structure 60 is used to limit the position between the second connecting end 522 and the end surface of the blocking portion 21 of the valve core component 20. The arrangement of the positioning structure 60 can ensure the stability of the abutment between the connecting rod and the blocking portion 21. The present solution does not limit the specific form of the positioning structure 60.

[0064] In this embodiment, the positioning structure 60 includes a positioning groove 61 and a positioning protrusion 62. The positioning groove 61 is arranged on the end surface of the blocking portion 21. The end of the connecting rod away from the connecting plate is a hemispherical structure, and the hemispherical structure forms a positioning protrusion 62. The positioning protrusion 62 is positioned and matched with the positioning groove 61. The above arrangement has a simple structure, is easy to process, and can reduce the wear between the connecting rod and the blocking portion 21, thereby ensuring the service life of the connecting rod and the blocking portion 21.

[0065] like Figure 3 and Figure 4 As shown, further, along the axial direction of the first installation opening 103, the first installation opening 103 is provided with a first limit portion 71 and a second limit portion 72 distributed at intervals, the guide member 50 is located between the first limit portion 71 and the second limit portion 72, the guide member 50 has a first limit position and a second limit position that are relatively set, and the two ends of the guide member 50 can respectively cooperate with the first limit portion 71 and the second limit portion 72 to limit the movement stroke of the guide member 50. Such a setting can further improve the accuracy of opening and closing the valve of this solution. In this embodiment, the distribution direction of the first limit portion 71 and the second limit portion 72 is the same as the distribution direction of the first memory alloy spring and the second memory alloy spring.

[0066] When the valve is in the open state, the first memory alloy spring is in a shortened state and the second memory alloy spring is in an extended state. Due to the limiting effect of the guide member 50 and the first limiting portion 71, the force of the second memory alloy spring is still greater than the force of the first memory alloy spring. This arrangement can reduce or avoid the shaking of the valve core component 20 when the valve is in the open state.

[0067] When closing the first opening 102, the first memory alloy spring extends, the second memory alloy spring contracts, and the elastic force of the first memory alloy spring is greater than the elastic force of the second memory alloy spring, so as to drive the valve core component 20 to close the first opening 102. After closing the first opening 102, under the action of the guide member 50 and the second limit portion 72, the valve core component 20 reaches the limit valve closing position to ensure the valve closing accuracy.

[0068] In this embodiment, the first installation opening 103 is coaxially arranged with the first opening 102, and the diameter of the first installation opening 103 is larger than the diameter of the first opening 102, and the end surface of the end of the first installation opening 103 connected with the first opening 102 forms a first limiting portion 71. The drain valve further includes a gasket, which is arranged at the end of the first installation opening 103 away from the first opening 102, and the gasket forms a second limiting portion 72; wherein the end surface of the end of the first installation opening 103 connected with the first opening 102 is limitedly matched with the end surface of one end of the guide member 50, and the gasket is limitedly matched with the end surface of the other end of the guide member 50. The above arrangement has a simple structure and is convenient for assembling the drain valve.

[0069] like Figure 2 and Figure 3 As shown, specifically, the valve body 10 includes a main body 11 and a valve seat 12. The main body 11 is provided with a circulation channel 101, and the main body 11 is also provided with a second installation port 1101, and the second installation port 1101 is communicated with the circulation channel 101. The valve seat 12 is provided with a first opening 102 and a first installation port 103 that are communicated with each other, and the valve seat 12 is arranged at the second installation port 1101, and the first opening 102 is communicated with the circulation channel 101. In this embodiment, the valve seat 12 is threadedly connected to the main body 11. Such a configuration can ensure the convenience of assembling the drain valve.

[0070] like Figures 3 to 5 as well as Fig.10 As shown, in this embodiment, the valve core component 20 also includes a valve stem 22, and the blocking portion 21 is arranged at the end of the valve stem 22, and the diameter of the blocking portion 21 is larger than the diameter of the valve stem 22. The valve seat 12 is also provided with a first avoidance groove 121, which is arranged at an end of the first opening 102 away from the first installation port 103 and is coaxially arranged with the first installation port 103, and the diameter of the first avoidance groove 121 is larger than the diameter of the first installation port 103. In this way, when the blocking portion 21 opens the first opening 102, the blocking portion 21 is located in the first avoidance groove 121, so that a channel for fluid circulation is formed between the first avoidance groove 121 and the blocking portion 21.

[0071] Furthermore, the first opening 102 is arranged on the side wall of the circulation channel 101, and the valve body 10 is also provided with a second opening 104, which is arranged on the side wall of the circulation channel 101, and the second opening 104 is arranged opposite to the first opening 102, and the end of the valve core component 20 away from the blocking portion 21 is arranged corresponding to the second opening 104. In this embodiment, the second opening 104 is arranged on the side wall of the main body 11, and the valve core component 20 includes two blocking portions 21, and the two blocking portions 21 are respectively arranged at the two ends of the valve stem 22, one of the blocking portions 21 is arranged corresponding to the first opening 102, and the other blocking portion 21 is arranged corresponding to the second opening 104. The first opening 102 and the second opening 104 have the same circulation area and can be opened at the same time. The above arrangement can balance the pressure difference at both ends of the valve core component 20 and ensure the smoothness of the valve core component 20 when it is opened.

[0072] Furthermore, in this embodiment, a second avoidance groove 1102 is further provided on the side wall of the main body 11 . The second avoidance groove 1102 is coaxial with the second opening 104 , and the diameter of the second avoidance groove 1102 is greater than the diameter of the second opening 104 . The first memory alloy spring is sleeved on the valve stem 22. The first memory alloy spring includes a first guide section 31 and a second guide section 32 arranged in sequence along the axial direction. The diameter of the first guide section 31 is smaller than the diameter of the second guide section 32. The length of the first guide section 31 is greater than the length of the second guide section 32. The inner side wall of the first guide section 31 is matched with the side wall of the valve stem 22 for guiding. The end of the first guide section 31 away from the second guide section 32 is matched with the corresponding blocking portion 21 for stopping. The second guide section 32 is located in the second avoidance groove 1102 and matches the stop of the second avoidance groove 1102. The outer side wall of the second guide section 32 is matched with the side wall of the second avoidance groove 1102 for guiding. When the first opening 102 is in a closed state, at least 80% of the length of the first guide section 31 is located in the circulation channel 101. Such a configuration can ensure the stability of the first memory alloy spring in the process of elongation or shortening, and can ensure the accuracy of the first memory alloy spring in sensing the fluid temperature, and ensure the valve opening accuracy.

[0073] like Fig.11 and Fig.12 As shown, the drain valve provided in the second embodiment of the present invention is different from that in the first embodiment in that:

[0074] When the temperature in the circulation channel 101 is lower than the first preset temperature and the temperature at the first mounting port 103 is lower than the second preset temperature, the second driving member 40 shortens and the first driving member 30 lengthens, and the first driving member 30 and the second driving member 40 drive the blocking portion 21 to open the first opening 102 .

[0075] Specifically, in this embodiment, the first preset temperature and the second preset temperature are both set to 3°C.

[0076] When the fluid temperature in the circulation channel 101 and the ambient temperature at the first installation port 103 are both lower than 3°C, the elastic force of the first memory alloy spring increases and the first memory alloy spring stretches, while the elastic force of the second memory alloy spring decreases and the second memory alloy spring shortens to open the valve.

[0077] When the fluid temperature in the circulation channel 101 and the ambient temperature at the first installation port 103 are not lower than 3°C, the elastic force of the first memory alloy spring decreases, the first memory alloy spring shortens, the elastic force of the second memory alloy spring increases, and the second memory alloy spring extends to achieve valve closing.

[0078] Furthermore, when the temperature in the circulation channel 101 is not lower than 3°C and the temperature at the first installation port 103 is below 3°C, the valve core component 20 does not move, and the valve core component 20 blocks the first opening 102; when the temperature in the circulation channel 101 is below 3°C and the temperature at the first installation port 103 is not lower than 3°C, the valve core component 20 does not move, and the valve core component 20 blocks the first opening 102.

[0079] Specifically, in this embodiment, when the fluid temperature is lower than 3°C, but the air temperature is still at 3°C ​​or even higher, the actual use condition at this time is the local low-temperature water that occurs during summer refrigeration, but the ambient temperature is high and there is no risk of freezing. In actual use, it is not desirable to open the drain valve. At this time, the elastic force of the first memory alloy spring increases, but because the temperature at the first installation port 103 is not lower than 3°C, the elastic force of the second memory alloy spring does not decrease and is still in a state of relatively large elastic force. Therefore, the first memory alloy spring does not have sufficient driving force to open the valve core component 20. At this time, the valve core component 20 still remains in a closed valve state, and no accidental drainage occurs.

[0080] When the fluid temperature is still at 3°C ​​or even higher, but the air temperature is lower than 3°C, it is not desirable to open the drain valve in actual use. At this time, the elastic force of the first memory alloy spring is reduced, the first memory alloy spring is shortened, and the second memory alloy spring is still in a shortened state. At this time, the first memory alloy spring and the second memory alloy spring do not provide a moving force to the valve core component 20, thereby ensuring that the first opening 102 will not be opened.

[0081] Only when the fluid temperature and the ambient temperature are both below 3°C, or lower, the first memory alloy spring force increases and the second memory alloy spring force decreases, and the valve core component 20 opens the first opening 102 under the combined spring force of the first memory alloy spring and the second memory alloy spring.

[0082] If the first opening 102 is in an open state and the fluid in the drain valve has been drained, the first memory alloy spring and the second memory alloy spring both sense the air temperature. If the ambient temperature is below 3°C at this time, the valve remains open; if the ambient temperature is above 3°C at this time, the first memory alloy spring and the second memory alloy spring both sense the ambient temperature and close the first opening.

[0083] If water with a temperature not lower than 3°C is introduced in a low temperature environment, the first opening 102 is initially in an open state. When water flows through the first memory alloy spring and the second memory alloy spring, the elastic force of the second memory alloy spring increases, and the elastic force of the first memory alloy spring decreases. The elastic force of the second memory alloy spring is greater than the elastic force of the first memory alloy spring, so that the second memory alloy spring is extended and the first memory alloy spring is shortened, thereby closing the valve. Therefore, the valve closing logic meets the actual use conditions.

[0084] Furthermore, in the guide member 50 of this embodiment, the end surface of the guide portion 51 close to the valve core component 20 is arranged to protrude from the end surface of the connecting rod away from the connecting plate. This arrangement can prevent the connecting rod from further driving the blocking portion 21 to move toward the first opening 102 when the blocking portion 21 blocks the first opening 102, thereby further improving the valve closing accuracy.

[0085] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0086] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0087] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0088] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0089] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0090] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drain valve, characterized in that: The drain valve comprises: A valve body (10), comprising a circulation channel (101), a first opening (102) and a first installation port (103), wherein the first installation port (103) is located outside the circulation channel (101), and two ends of the first opening (102) are respectively connected to the circulation channel (101) and the first installation port (103); A valve core component (20) is movably arranged in the circulation channel (101), the valve core component (20) has a blocking portion (21), the blocking portion (21) is arranged corresponding to the first opening (102), and the blocking portion (21) can block or open the first opening (102); A first driving member (30) and a second driving member (40) are respectively arranged in the circulation channel (101) and the first installation port (103); the first driving member (30) and the second driving member (40) are respectively connected to the valve core component (20) by driving; along the moving direction of the valve core component (20), the first driving member (30) and the second driving member (40) are respectively located on both sides of the blocking portion (21); the first driving member (30) can sense the temperature in the circulation channel (101), and the second driving member (40) can sense the temperature at the first installation port (103); The first driving member (30) can extend or shorten as the temperature changes, and the second driving member (40) can extend or shorten as the temperature changes. The first driving member (30) and the second driving member (40) cooperate to drive the valve core component (20) to move, so that the blocking portion (21) blocks or opens the first opening (102).

2. The drain valve according to claim 1, characterized in that: When the temperature in the circulation channel (101) is lower than a first preset temperature, and the temperature at the first mounting port (103) is lower than a second preset temperature, the first driving member (30) is extended, and the second driving member (40) is shortened, and the first driving member (30) and the second driving member (40) drive the blocking portion (21) to open the first opening (102); or, When the temperature in the circulation channel (101) is lower than a first preset temperature, and the temperature at the first mounting port (103) is lower than a second preset temperature, the first driving member (30) is shortened, and the second driving member (40) is extended, and the first driving member (30) and the second driving member (40) drive the blocking portion (21) to open the first opening (102).

3. The drain valve according to claim 1, characterized in that: When the temperature in the circulation channel (101) is not lower than a first preset temperature or the temperature at the first mounting port (103) is not lower than a second preset temperature, the blocking portion (21) blocks the first opening (102).

4. The drain valve according to claim 1, characterized in that: The drain valve also includes: A guide member (50) is located in the first installation opening (103). The guide member (50) is arranged between the second driving member (40) and the valve body (10). The guide member (50) can cooperate with the second driving member (40) in a guiding manner.

5. The drain valve according to claim 4, characterized in that: The guide member (50) includes a guide portion (51) and a connecting portion (52) which are connected to each other. The guide portion (51) is sleeved on the outer side of the second driving member (40) and cooperates with the second driving member (40) in a guiding manner. The connecting portion (52) is located at an end of the second driving member (40) close to the valve core component (20). The connecting portion (52) includes a first connecting end (521) and a second connecting end (522) which are arranged opposite to each other along the axial direction of the guide portion (51). The first connecting end (521) is connected to the guide portion (51), and the second connecting end (522) is in contact with the valve core component (20). The end of the second driving member (40) close to the valve core component (20) is connected to at least one of the guide portion (51) and the connecting portion (52).

6. The drain valve according to claim 5, characterized in that: The second connecting end (522) is connected to the end surface of the blocking portion (21), and the drain valve further comprises: A positioning structure (60) is arranged between the blocking portion (21) and the second connecting end (522), and the positioning structure (60) is used to limit the position between the second connecting end (522) and the end surface of the blocking portion (21).

7. The drain valve according to claim 5, characterized in that: Along the axial direction of the first mounting opening (103), a first limiting portion (71) and a second limiting portion (72) are arranged in the first mounting opening (103) at intervals, and the guide member (50) is located between the first limiting portion (71) and the second limiting portion (72), and the two ends of the guide member (50) can respectively cooperate with the first limiting portion (71) and the second limiting portion (72) to limit the moving stroke of the guide member (50).

8. The drain valve according to claim 7, characterized in that: The first installation opening (103) is coaxially arranged with the first opening (102), and the diameter of the first installation opening (103) is larger than the diameter of the first opening (102); the end surface of one end of the first installation opening (103) connected to the first opening (102) forms the first limiting portion (71); The drain valve further comprises a gasket, which is arranged at an end of the first installation opening (103) away from the first opening (102), and the gasket forms a second limiting portion (72); The end surface of one end of the first mounting port (103) connected to the first opening (102) is limitedly matched with the end surface of one end of the guide member (50), and the gasket is limitedly matched with the end surface of the other end of the guide member (50).

9. The drain valve according to claim 1, characterized in that: The valve body (10) comprises: The main body (11) is provided with the circulation channel (101), and the main body (11) is also provided with a second mounting port, wherein the second mounting port is in communication with the circulation channel (101); The valve seat (12) is provided with the first opening (102) and the first installation port (103) which are communicated with each other. The valve seat (12) is arranged at the second installation port, and the first opening (102) is communicated with the circulation channel (101).

10. The drain valve according to claim 1, characterized in that: The first opening (102) is arranged on the side wall of the circulation channel (101), and the valve body (10) is also provided with a second opening (104), the second opening (104) is arranged on the side wall of the circulation channel (101), and the second opening (104) is arranged coaxially with the first opening (102), and the end of the valve core component (20) away from the blocking portion (21) is arranged corresponding to the second opening (104).

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